1 /* This is the Linux kernel elf-loading code, ported into user space */
2 #include "qemu/osdep.h"
3 #include <sys/param.h>
4
5 #include <sys/prctl.h>
6 #include <sys/resource.h>
7 #include <sys/shm.h>
8
9 #include "qemu.h"
10 #include "user/tswap-target.h"
11 #include "exec/page-protection.h"
12 #include "user/guest-base.h"
13 #include "user-internals.h"
14 #include "signal-common.h"
15 #include "loader.h"
16 #include "user-mmap.h"
17 #include "disas/disas.h"
18 #include "qemu/bitops.h"
19 #include "qemu/path.h"
20 #include "qemu/queue.h"
21 #include "qemu/guest-random.h"
22 #include "qemu/units.h"
23 #include "qemu/selfmap.h"
24 #include "qemu/lockable.h"
25 #include "qapi/error.h"
26 #include "qemu/error-report.h"
27 #include "target_signal.h"
28 #include "tcg/debuginfo.h"
29
30 #ifdef TARGET_ARM
31 #include "target/arm/cpu-features.h"
32 #endif
33
34 #ifdef _ARCH_PPC64
35 #undef ARCH_DLINFO
36 #undef ELF_PLATFORM
37 #undef ELF_HWCAP
38 #undef ELF_HWCAP2
39 #undef ELF_CLASS
40 #undef ELF_DATA
41 #undef ELF_ARCH
42 #endif
43
44 #ifndef TARGET_ARCH_HAS_SIGTRAMP_PAGE
45 #define TARGET_ARCH_HAS_SIGTRAMP_PAGE 0
46 #endif
47
48 typedef struct {
49 const uint8_t *image;
50 const uint32_t *relocs;
51 unsigned image_size;
52 unsigned reloc_count;
53 unsigned sigreturn_ofs;
54 unsigned rt_sigreturn_ofs;
55 } VdsoImageInfo;
56
57 #define ELF_OSABI ELFOSABI_SYSV
58
59 /* from personality.h */
60
61 /*
62 * Flags for bug emulation.
63 *
64 * These occupy the top three bytes.
65 */
66 enum {
67 ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */
68 FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to
69 descriptors (signal handling) */
70 MMAP_PAGE_ZERO = 0x0100000,
71 ADDR_COMPAT_LAYOUT = 0x0200000,
72 READ_IMPLIES_EXEC = 0x0400000,
73 ADDR_LIMIT_32BIT = 0x0800000,
74 SHORT_INODE = 0x1000000,
75 WHOLE_SECONDS = 0x2000000,
76 STICKY_TIMEOUTS = 0x4000000,
77 ADDR_LIMIT_3GB = 0x8000000,
78 };
79
80 /*
81 * Personality types.
82 *
83 * These go in the low byte. Avoid using the top bit, it will
84 * conflict with error returns.
85 */
86 enum {
87 PER_LINUX = 0x0000,
88 PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT,
89 PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS,
90 PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
91 PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
92 PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS | SHORT_INODE,
93 PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
94 PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
95 PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS,
96 PER_BSD = 0x0006,
97 PER_SUNOS = 0x0006 | STICKY_TIMEOUTS,
98 PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
99 PER_LINUX32 = 0x0008,
100 PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB,
101 PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
102 PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
103 PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
104 PER_RISCOS = 0x000c,
105 PER_SOLARIS = 0x000d | STICKY_TIMEOUTS,
106 PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
107 PER_OSF4 = 0x000f, /* OSF/1 v4 */
108 PER_HPUX = 0x0010,
109 PER_MASK = 0x00ff,
110 };
111
112 /*
113 * Return the base personality without flags.
114 */
115 #define personality(pers) (pers & PER_MASK)
116
info_is_fdpic(struct image_info * info)117 int info_is_fdpic(struct image_info *info)
118 {
119 return info->personality == PER_LINUX_FDPIC;
120 }
121
122 /* this flag is uneffective under linux too, should be deleted */
123 #ifndef MAP_DENYWRITE
124 #define MAP_DENYWRITE 0
125 #endif
126
127 /* should probably go in elf.h */
128 #ifndef ELIBBAD
129 #define ELIBBAD 80
130 #endif
131
132 #if TARGET_BIG_ENDIAN
133 #define ELF_DATA ELFDATA2MSB
134 #else
135 #define ELF_DATA ELFDATA2LSB
136 #endif
137
138 #ifdef TARGET_ABI_MIPSN32
139 typedef abi_ullong target_elf_greg_t;
140 #define tswapreg(ptr) tswap64(ptr)
141 #else
142 typedef abi_ulong target_elf_greg_t;
143 #define tswapreg(ptr) tswapal(ptr)
144 #endif
145
146 #ifdef USE_UID16
147 typedef abi_ushort target_uid_t;
148 typedef abi_ushort target_gid_t;
149 #else
150 typedef abi_uint target_uid_t;
151 typedef abi_uint target_gid_t;
152 #endif
153 typedef abi_int target_pid_t;
154
155 #ifdef TARGET_I386
156
157 #define ELF_HWCAP get_elf_hwcap()
158
get_elf_hwcap(void)159 static uint32_t get_elf_hwcap(void)
160 {
161 X86CPU *cpu = X86_CPU(thread_cpu);
162
163 return cpu->env.features[FEAT_1_EDX];
164 }
165
166 #ifdef TARGET_X86_64
167 #define ELF_CLASS ELFCLASS64
168 #define ELF_ARCH EM_X86_64
169
170 #define ELF_PLATFORM "x86_64"
171
init_thread(struct target_pt_regs * regs,struct image_info * infop)172 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
173 {
174 regs->rax = 0;
175 regs->rsp = infop->start_stack;
176 regs->rip = infop->entry;
177 }
178
179 #define ELF_NREG 27
180 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
181
182 /*
183 * Note that ELF_NREG should be 29 as there should be place for
184 * TRAPNO and ERR "registers" as well but linux doesn't dump
185 * those.
186 *
187 * See linux kernel: arch/x86/include/asm/elf.h
188 */
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUX86State * env)189 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
190 {
191 (*regs)[0] = tswapreg(env->regs[15]);
192 (*regs)[1] = tswapreg(env->regs[14]);
193 (*regs)[2] = tswapreg(env->regs[13]);
194 (*regs)[3] = tswapreg(env->regs[12]);
195 (*regs)[4] = tswapreg(env->regs[R_EBP]);
196 (*regs)[5] = tswapreg(env->regs[R_EBX]);
197 (*regs)[6] = tswapreg(env->regs[11]);
198 (*regs)[7] = tswapreg(env->regs[10]);
199 (*regs)[8] = tswapreg(env->regs[9]);
200 (*regs)[9] = tswapreg(env->regs[8]);
201 (*regs)[10] = tswapreg(env->regs[R_EAX]);
202 (*regs)[11] = tswapreg(env->regs[R_ECX]);
203 (*regs)[12] = tswapreg(env->regs[R_EDX]);
204 (*regs)[13] = tswapreg(env->regs[R_ESI]);
205 (*regs)[14] = tswapreg(env->regs[R_EDI]);
206 (*regs)[15] = tswapreg(env->regs[R_EAX]); /* XXX */
207 (*regs)[16] = tswapreg(env->eip);
208 (*regs)[17] = tswapreg(env->segs[R_CS].selector & 0xffff);
209 (*regs)[18] = tswapreg(env->eflags);
210 (*regs)[19] = tswapreg(env->regs[R_ESP]);
211 (*regs)[20] = tswapreg(env->segs[R_SS].selector & 0xffff);
212 (*regs)[21] = tswapreg(env->segs[R_FS].selector & 0xffff);
213 (*regs)[22] = tswapreg(env->segs[R_GS].selector & 0xffff);
214 (*regs)[23] = tswapreg(env->segs[R_DS].selector & 0xffff);
215 (*regs)[24] = tswapreg(env->segs[R_ES].selector & 0xffff);
216 (*regs)[25] = tswapreg(env->segs[R_FS].selector & 0xffff);
217 (*regs)[26] = tswapreg(env->segs[R_GS].selector & 0xffff);
218 }
219
220 #if ULONG_MAX > UINT32_MAX
221 #define INIT_GUEST_COMMPAGE
init_guest_commpage(void)222 static bool init_guest_commpage(void)
223 {
224 /*
225 * The vsyscall page is at a high negative address aka kernel space,
226 * which means that we cannot actually allocate it with target_mmap.
227 * We still should be able to use page_set_flags, unless the user
228 * has specified -R reserved_va, which would trigger an assert().
229 */
230 if (reserved_va != 0 &&
231 TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE - 1 > reserved_va) {
232 error_report("Cannot allocate vsyscall page");
233 exit(EXIT_FAILURE);
234 }
235 page_set_flags(TARGET_VSYSCALL_PAGE,
236 TARGET_VSYSCALL_PAGE | ~TARGET_PAGE_MASK,
237 PAGE_EXEC | PAGE_VALID);
238 return true;
239 }
240 #endif
241 #else
242
243 /*
244 * This is used to ensure we don't load something for the wrong architecture.
245 */
246 #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
247
248 /*
249 * These are used to set parameters in the core dumps.
250 */
251 #define ELF_CLASS ELFCLASS32
252 #define ELF_ARCH EM_386
253
254 #define ELF_PLATFORM get_elf_platform()
255 #define EXSTACK_DEFAULT true
256
get_elf_platform(void)257 static const char *get_elf_platform(void)
258 {
259 static char elf_platform[] = "i386";
260 int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL);
261 if (family > 6) {
262 family = 6;
263 }
264 if (family >= 3) {
265 elf_platform[1] = '0' + family;
266 }
267 return elf_platform;
268 }
269
init_thread(struct target_pt_regs * regs,struct image_info * infop)270 static inline void init_thread(struct target_pt_regs *regs,
271 struct image_info *infop)
272 {
273 regs->esp = infop->start_stack;
274 regs->eip = infop->entry;
275
276 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
277 starts %edx contains a pointer to a function which might be
278 registered using `atexit'. This provides a mean for the
279 dynamic linker to call DT_FINI functions for shared libraries
280 that have been loaded before the code runs.
281
282 A value of 0 tells we have no such handler. */
283 regs->edx = 0;
284 }
285
286 #define ELF_NREG 17
287 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
288
289 /*
290 * Note that ELF_NREG should be 19 as there should be place for
291 * TRAPNO and ERR "registers" as well but linux doesn't dump
292 * those.
293 *
294 * See linux kernel: arch/x86/include/asm/elf.h
295 */
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUX86State * env)296 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
297 {
298 (*regs)[0] = tswapreg(env->regs[R_EBX]);
299 (*regs)[1] = tswapreg(env->regs[R_ECX]);
300 (*regs)[2] = tswapreg(env->regs[R_EDX]);
301 (*regs)[3] = tswapreg(env->regs[R_ESI]);
302 (*regs)[4] = tswapreg(env->regs[R_EDI]);
303 (*regs)[5] = tswapreg(env->regs[R_EBP]);
304 (*regs)[6] = tswapreg(env->regs[R_EAX]);
305 (*regs)[7] = tswapreg(env->segs[R_DS].selector & 0xffff);
306 (*regs)[8] = tswapreg(env->segs[R_ES].selector & 0xffff);
307 (*regs)[9] = tswapreg(env->segs[R_FS].selector & 0xffff);
308 (*regs)[10] = tswapreg(env->segs[R_GS].selector & 0xffff);
309 (*regs)[11] = tswapreg(env->regs[R_EAX]); /* XXX */
310 (*regs)[12] = tswapreg(env->eip);
311 (*regs)[13] = tswapreg(env->segs[R_CS].selector & 0xffff);
312 (*regs)[14] = tswapreg(env->eflags);
313 (*regs)[15] = tswapreg(env->regs[R_ESP]);
314 (*regs)[16] = tswapreg(env->segs[R_SS].selector & 0xffff);
315 }
316
317 /*
318 * i386 is the only target which supplies AT_SYSINFO for the vdso.
319 * All others only supply AT_SYSINFO_EHDR.
320 */
321 #define DLINFO_ARCH_ITEMS (vdso_info != NULL)
322 #define ARCH_DLINFO \
323 do { \
324 if (vdso_info) { \
325 NEW_AUX_ENT(AT_SYSINFO, vdso_info->entry); \
326 } \
327 } while (0)
328
329 #endif /* TARGET_X86_64 */
330
331 #define VDSO_HEADER "vdso.c.inc"
332
333 #define USE_ELF_CORE_DUMP
334 #define ELF_EXEC_PAGESIZE 4096
335
336 #endif /* TARGET_I386 */
337
338 #ifdef TARGET_ARM
339
340 #ifndef TARGET_AARCH64
341 /* 32 bit ARM definitions */
342
343 #define ELF_ARCH EM_ARM
344 #define ELF_CLASS ELFCLASS32
345 #define EXSTACK_DEFAULT true
346
init_thread(struct target_pt_regs * regs,struct image_info * infop)347 static inline void init_thread(struct target_pt_regs *regs,
348 struct image_info *infop)
349 {
350 abi_long stack = infop->start_stack;
351 memset(regs, 0, sizeof(*regs));
352
353 regs->uregs[16] = ARM_CPU_MODE_USR;
354 if (infop->entry & 1) {
355 regs->uregs[16] |= CPSR_T;
356 }
357 regs->uregs[15] = infop->entry & 0xfffffffe;
358 regs->uregs[13] = infop->start_stack;
359 /* FIXME - what to for failure of get_user()? */
360 get_user_ual(regs->uregs[2], stack + 8); /* envp */
361 get_user_ual(regs->uregs[1], stack + 4); /* envp */
362 /* XXX: it seems that r0 is zeroed after ! */
363 regs->uregs[0] = 0;
364 /* For uClinux PIC binaries. */
365 /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
366 regs->uregs[10] = infop->start_data;
367
368 /* Support ARM FDPIC. */
369 if (info_is_fdpic(infop)) {
370 /* As described in the ABI document, r7 points to the loadmap info
371 * prepared by the kernel. If an interpreter is needed, r8 points
372 * to the interpreter loadmap and r9 points to the interpreter
373 * PT_DYNAMIC info. If no interpreter is needed, r8 is zero, and
374 * r9 points to the main program PT_DYNAMIC info.
375 */
376 regs->uregs[7] = infop->loadmap_addr;
377 if (infop->interpreter_loadmap_addr) {
378 /* Executable is dynamically loaded. */
379 regs->uregs[8] = infop->interpreter_loadmap_addr;
380 regs->uregs[9] = infop->interpreter_pt_dynamic_addr;
381 } else {
382 regs->uregs[8] = 0;
383 regs->uregs[9] = infop->pt_dynamic_addr;
384 }
385 }
386 }
387
388 #define ELF_NREG 18
389 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
390
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUARMState * env)391 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUARMState *env)
392 {
393 (*regs)[0] = tswapreg(env->regs[0]);
394 (*regs)[1] = tswapreg(env->regs[1]);
395 (*regs)[2] = tswapreg(env->regs[2]);
396 (*regs)[3] = tswapreg(env->regs[3]);
397 (*regs)[4] = tswapreg(env->regs[4]);
398 (*regs)[5] = tswapreg(env->regs[5]);
399 (*regs)[6] = tswapreg(env->regs[6]);
400 (*regs)[7] = tswapreg(env->regs[7]);
401 (*regs)[8] = tswapreg(env->regs[8]);
402 (*regs)[9] = tswapreg(env->regs[9]);
403 (*regs)[10] = tswapreg(env->regs[10]);
404 (*regs)[11] = tswapreg(env->regs[11]);
405 (*regs)[12] = tswapreg(env->regs[12]);
406 (*regs)[13] = tswapreg(env->regs[13]);
407 (*regs)[14] = tswapreg(env->regs[14]);
408 (*regs)[15] = tswapreg(env->regs[15]);
409
410 (*regs)[16] = tswapreg(cpsr_read((CPUARMState *)env));
411 (*regs)[17] = tswapreg(env->regs[0]); /* XXX */
412 }
413
414 #define USE_ELF_CORE_DUMP
415 #define ELF_EXEC_PAGESIZE 4096
416
417 enum
418 {
419 ARM_HWCAP_ARM_SWP = 1 << 0,
420 ARM_HWCAP_ARM_HALF = 1 << 1,
421 ARM_HWCAP_ARM_THUMB = 1 << 2,
422 ARM_HWCAP_ARM_26BIT = 1 << 3,
423 ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
424 ARM_HWCAP_ARM_FPA = 1 << 5,
425 ARM_HWCAP_ARM_VFP = 1 << 6,
426 ARM_HWCAP_ARM_EDSP = 1 << 7,
427 ARM_HWCAP_ARM_JAVA = 1 << 8,
428 ARM_HWCAP_ARM_IWMMXT = 1 << 9,
429 ARM_HWCAP_ARM_CRUNCH = 1 << 10,
430 ARM_HWCAP_ARM_THUMBEE = 1 << 11,
431 ARM_HWCAP_ARM_NEON = 1 << 12,
432 ARM_HWCAP_ARM_VFPv3 = 1 << 13,
433 ARM_HWCAP_ARM_VFPv3D16 = 1 << 14,
434 ARM_HWCAP_ARM_TLS = 1 << 15,
435 ARM_HWCAP_ARM_VFPv4 = 1 << 16,
436 ARM_HWCAP_ARM_IDIVA = 1 << 17,
437 ARM_HWCAP_ARM_IDIVT = 1 << 18,
438 ARM_HWCAP_ARM_VFPD32 = 1 << 19,
439 ARM_HWCAP_ARM_LPAE = 1 << 20,
440 ARM_HWCAP_ARM_EVTSTRM = 1 << 21,
441 ARM_HWCAP_ARM_FPHP = 1 << 22,
442 ARM_HWCAP_ARM_ASIMDHP = 1 << 23,
443 ARM_HWCAP_ARM_ASIMDDP = 1 << 24,
444 ARM_HWCAP_ARM_ASIMDFHM = 1 << 25,
445 ARM_HWCAP_ARM_ASIMDBF16 = 1 << 26,
446 ARM_HWCAP_ARM_I8MM = 1 << 27,
447 };
448
449 enum {
450 ARM_HWCAP2_ARM_AES = 1 << 0,
451 ARM_HWCAP2_ARM_PMULL = 1 << 1,
452 ARM_HWCAP2_ARM_SHA1 = 1 << 2,
453 ARM_HWCAP2_ARM_SHA2 = 1 << 3,
454 ARM_HWCAP2_ARM_CRC32 = 1 << 4,
455 ARM_HWCAP2_ARM_SB = 1 << 5,
456 ARM_HWCAP2_ARM_SSBS = 1 << 6,
457 };
458
459 /* The commpage only exists for 32 bit kernels */
460
461 #define HI_COMMPAGE (intptr_t)0xffff0f00u
462
init_guest_commpage(void)463 static bool init_guest_commpage(void)
464 {
465 ARMCPU *cpu = ARM_CPU(thread_cpu);
466 int host_page_size = qemu_real_host_page_size();
467 abi_ptr commpage;
468 void *want;
469 void *addr;
470
471 /*
472 * M-profile allocates maximum of 2GB address space, so can never
473 * allocate the commpage. Skip it.
474 */
475 if (arm_feature(&cpu->env, ARM_FEATURE_M)) {
476 return true;
477 }
478
479 commpage = HI_COMMPAGE & -host_page_size;
480 want = g2h_untagged(commpage);
481 addr = mmap(want, host_page_size, PROT_READ | PROT_WRITE,
482 MAP_ANONYMOUS | MAP_PRIVATE |
483 (commpage < reserved_va ? MAP_FIXED : MAP_FIXED_NOREPLACE),
484 -1, 0);
485
486 if (addr == MAP_FAILED) {
487 perror("Allocating guest commpage");
488 exit(EXIT_FAILURE);
489 }
490 if (addr != want) {
491 return false;
492 }
493
494 /* Set kernel helper versions; rest of page is 0. */
495 __put_user(5, (uint32_t *)g2h_untagged(0xffff0ffcu));
496
497 if (mprotect(addr, host_page_size, PROT_READ)) {
498 perror("Protecting guest commpage");
499 exit(EXIT_FAILURE);
500 }
501
502 page_set_flags(commpage, commpage | (host_page_size - 1),
503 PAGE_READ | PAGE_EXEC | PAGE_VALID);
504 return true;
505 }
506
507 #define ELF_HWCAP get_elf_hwcap()
508 #define ELF_HWCAP2 get_elf_hwcap2()
509
get_elf_hwcap(void)510 uint32_t get_elf_hwcap(void)
511 {
512 ARMCPU *cpu = ARM_CPU(thread_cpu);
513 uint32_t hwcaps = 0;
514
515 hwcaps |= ARM_HWCAP_ARM_SWP;
516 hwcaps |= ARM_HWCAP_ARM_HALF;
517 hwcaps |= ARM_HWCAP_ARM_THUMB;
518 hwcaps |= ARM_HWCAP_ARM_FAST_MULT;
519
520 /* probe for the extra features */
521 #define GET_FEATURE(feat, hwcap) \
522 do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0)
523
524 #define GET_FEATURE_ID(feat, hwcap) \
525 do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0)
526
527 /* EDSP is in v5TE and above, but all our v5 CPUs are v5TE */
528 GET_FEATURE(ARM_FEATURE_V5, ARM_HWCAP_ARM_EDSP);
529 GET_FEATURE(ARM_FEATURE_IWMMXT, ARM_HWCAP_ARM_IWMMXT);
530 GET_FEATURE(ARM_FEATURE_THUMB2EE, ARM_HWCAP_ARM_THUMBEE);
531 GET_FEATURE(ARM_FEATURE_NEON, ARM_HWCAP_ARM_NEON);
532 GET_FEATURE(ARM_FEATURE_V6K, ARM_HWCAP_ARM_TLS);
533 GET_FEATURE(ARM_FEATURE_LPAE, ARM_HWCAP_ARM_LPAE);
534 GET_FEATURE_ID(aa32_arm_div, ARM_HWCAP_ARM_IDIVA);
535 GET_FEATURE_ID(aa32_thumb_div, ARM_HWCAP_ARM_IDIVT);
536 GET_FEATURE_ID(aa32_vfp, ARM_HWCAP_ARM_VFP);
537
538 if (cpu_isar_feature(aa32_fpsp_v3, cpu) ||
539 cpu_isar_feature(aa32_fpdp_v3, cpu)) {
540 hwcaps |= ARM_HWCAP_ARM_VFPv3;
541 if (cpu_isar_feature(aa32_simd_r32, cpu)) {
542 hwcaps |= ARM_HWCAP_ARM_VFPD32;
543 } else {
544 hwcaps |= ARM_HWCAP_ARM_VFPv3D16;
545 }
546 }
547 GET_FEATURE_ID(aa32_simdfmac, ARM_HWCAP_ARM_VFPv4);
548 /*
549 * MVFR1.FPHP and .SIMDHP must be in sync, and QEMU uses the same
550 * isar_feature function for both. The kernel reports them as two hwcaps.
551 */
552 GET_FEATURE_ID(aa32_fp16_arith, ARM_HWCAP_ARM_FPHP);
553 GET_FEATURE_ID(aa32_fp16_arith, ARM_HWCAP_ARM_ASIMDHP);
554 GET_FEATURE_ID(aa32_dp, ARM_HWCAP_ARM_ASIMDDP);
555 GET_FEATURE_ID(aa32_fhm, ARM_HWCAP_ARM_ASIMDFHM);
556 GET_FEATURE_ID(aa32_bf16, ARM_HWCAP_ARM_ASIMDBF16);
557 GET_FEATURE_ID(aa32_i8mm, ARM_HWCAP_ARM_I8MM);
558
559 return hwcaps;
560 }
561
get_elf_hwcap2(void)562 uint64_t get_elf_hwcap2(void)
563 {
564 ARMCPU *cpu = ARM_CPU(thread_cpu);
565 uint64_t hwcaps = 0;
566
567 GET_FEATURE_ID(aa32_aes, ARM_HWCAP2_ARM_AES);
568 GET_FEATURE_ID(aa32_pmull, ARM_HWCAP2_ARM_PMULL);
569 GET_FEATURE_ID(aa32_sha1, ARM_HWCAP2_ARM_SHA1);
570 GET_FEATURE_ID(aa32_sha2, ARM_HWCAP2_ARM_SHA2);
571 GET_FEATURE_ID(aa32_crc32, ARM_HWCAP2_ARM_CRC32);
572 GET_FEATURE_ID(aa32_sb, ARM_HWCAP2_ARM_SB);
573 GET_FEATURE_ID(aa32_ssbs, ARM_HWCAP2_ARM_SSBS);
574 return hwcaps;
575 }
576
elf_hwcap_str(uint32_t bit)577 const char *elf_hwcap_str(uint32_t bit)
578 {
579 static const char *hwcap_str[] = {
580 [__builtin_ctz(ARM_HWCAP_ARM_SWP )] = "swp",
581 [__builtin_ctz(ARM_HWCAP_ARM_HALF )] = "half",
582 [__builtin_ctz(ARM_HWCAP_ARM_THUMB )] = "thumb",
583 [__builtin_ctz(ARM_HWCAP_ARM_26BIT )] = "26bit",
584 [__builtin_ctz(ARM_HWCAP_ARM_FAST_MULT)] = "fast_mult",
585 [__builtin_ctz(ARM_HWCAP_ARM_FPA )] = "fpa",
586 [__builtin_ctz(ARM_HWCAP_ARM_VFP )] = "vfp",
587 [__builtin_ctz(ARM_HWCAP_ARM_EDSP )] = "edsp",
588 [__builtin_ctz(ARM_HWCAP_ARM_JAVA )] = "java",
589 [__builtin_ctz(ARM_HWCAP_ARM_IWMMXT )] = "iwmmxt",
590 [__builtin_ctz(ARM_HWCAP_ARM_CRUNCH )] = "crunch",
591 [__builtin_ctz(ARM_HWCAP_ARM_THUMBEE )] = "thumbee",
592 [__builtin_ctz(ARM_HWCAP_ARM_NEON )] = "neon",
593 [__builtin_ctz(ARM_HWCAP_ARM_VFPv3 )] = "vfpv3",
594 [__builtin_ctz(ARM_HWCAP_ARM_VFPv3D16 )] = "vfpv3d16",
595 [__builtin_ctz(ARM_HWCAP_ARM_TLS )] = "tls",
596 [__builtin_ctz(ARM_HWCAP_ARM_VFPv4 )] = "vfpv4",
597 [__builtin_ctz(ARM_HWCAP_ARM_IDIVA )] = "idiva",
598 [__builtin_ctz(ARM_HWCAP_ARM_IDIVT )] = "idivt",
599 [__builtin_ctz(ARM_HWCAP_ARM_VFPD32 )] = "vfpd32",
600 [__builtin_ctz(ARM_HWCAP_ARM_LPAE )] = "lpae",
601 [__builtin_ctz(ARM_HWCAP_ARM_EVTSTRM )] = "evtstrm",
602 [__builtin_ctz(ARM_HWCAP_ARM_FPHP )] = "fphp",
603 [__builtin_ctz(ARM_HWCAP_ARM_ASIMDHP )] = "asimdhp",
604 [__builtin_ctz(ARM_HWCAP_ARM_ASIMDDP )] = "asimddp",
605 [__builtin_ctz(ARM_HWCAP_ARM_ASIMDFHM )] = "asimdfhm",
606 [__builtin_ctz(ARM_HWCAP_ARM_ASIMDBF16)] = "asimdbf16",
607 [__builtin_ctz(ARM_HWCAP_ARM_I8MM )] = "i8mm",
608 };
609
610 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
611 }
612
elf_hwcap2_str(uint32_t bit)613 const char *elf_hwcap2_str(uint32_t bit)
614 {
615 static const char *hwcap_str[] = {
616 [__builtin_ctz(ARM_HWCAP2_ARM_AES )] = "aes",
617 [__builtin_ctz(ARM_HWCAP2_ARM_PMULL)] = "pmull",
618 [__builtin_ctz(ARM_HWCAP2_ARM_SHA1 )] = "sha1",
619 [__builtin_ctz(ARM_HWCAP2_ARM_SHA2 )] = "sha2",
620 [__builtin_ctz(ARM_HWCAP2_ARM_CRC32)] = "crc32",
621 [__builtin_ctz(ARM_HWCAP2_ARM_SB )] = "sb",
622 [__builtin_ctz(ARM_HWCAP2_ARM_SSBS )] = "ssbs",
623 };
624
625 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
626 }
627
628 #undef GET_FEATURE
629 #undef GET_FEATURE_ID
630
631 #define ELF_PLATFORM get_elf_platform()
632
get_elf_platform(void)633 static const char *get_elf_platform(void)
634 {
635 CPUARMState *env = cpu_env(thread_cpu);
636
637 #if TARGET_BIG_ENDIAN
638 # define END "b"
639 #else
640 # define END "l"
641 #endif
642
643 if (arm_feature(env, ARM_FEATURE_V8)) {
644 return "v8" END;
645 } else if (arm_feature(env, ARM_FEATURE_V7)) {
646 if (arm_feature(env, ARM_FEATURE_M)) {
647 return "v7m" END;
648 } else {
649 return "v7" END;
650 }
651 } else if (arm_feature(env, ARM_FEATURE_V6)) {
652 return "v6" END;
653 } else if (arm_feature(env, ARM_FEATURE_V5)) {
654 return "v5" END;
655 } else {
656 return "v4" END;
657 }
658
659 #undef END
660 }
661
662 #else
663 /* 64 bit ARM definitions */
664
665 #define ELF_ARCH EM_AARCH64
666 #define ELF_CLASS ELFCLASS64
667 #if TARGET_BIG_ENDIAN
668 # define ELF_PLATFORM "aarch64_be"
669 #else
670 # define ELF_PLATFORM "aarch64"
671 #endif
672
init_thread(struct target_pt_regs * regs,struct image_info * infop)673 static inline void init_thread(struct target_pt_regs *regs,
674 struct image_info *infop)
675 {
676 abi_long stack = infop->start_stack;
677 memset(regs, 0, sizeof(*regs));
678
679 regs->pc = infop->entry & ~0x3ULL;
680 regs->sp = stack;
681 }
682
683 #define ELF_NREG 34
684 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
685
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUARMState * env)686 static void elf_core_copy_regs(target_elf_gregset_t *regs,
687 const CPUARMState *env)
688 {
689 int i;
690
691 for (i = 0; i < 32; i++) {
692 (*regs)[i] = tswapreg(env->xregs[i]);
693 }
694 (*regs)[32] = tswapreg(env->pc);
695 (*regs)[33] = tswapreg(pstate_read((CPUARMState *)env));
696 }
697
698 #define USE_ELF_CORE_DUMP
699 #define ELF_EXEC_PAGESIZE 4096
700
701 enum {
702 ARM_HWCAP_A64_FP = 1 << 0,
703 ARM_HWCAP_A64_ASIMD = 1 << 1,
704 ARM_HWCAP_A64_EVTSTRM = 1 << 2,
705 ARM_HWCAP_A64_AES = 1 << 3,
706 ARM_HWCAP_A64_PMULL = 1 << 4,
707 ARM_HWCAP_A64_SHA1 = 1 << 5,
708 ARM_HWCAP_A64_SHA2 = 1 << 6,
709 ARM_HWCAP_A64_CRC32 = 1 << 7,
710 ARM_HWCAP_A64_ATOMICS = 1 << 8,
711 ARM_HWCAP_A64_FPHP = 1 << 9,
712 ARM_HWCAP_A64_ASIMDHP = 1 << 10,
713 ARM_HWCAP_A64_CPUID = 1 << 11,
714 ARM_HWCAP_A64_ASIMDRDM = 1 << 12,
715 ARM_HWCAP_A64_JSCVT = 1 << 13,
716 ARM_HWCAP_A64_FCMA = 1 << 14,
717 ARM_HWCAP_A64_LRCPC = 1 << 15,
718 ARM_HWCAP_A64_DCPOP = 1 << 16,
719 ARM_HWCAP_A64_SHA3 = 1 << 17,
720 ARM_HWCAP_A64_SM3 = 1 << 18,
721 ARM_HWCAP_A64_SM4 = 1 << 19,
722 ARM_HWCAP_A64_ASIMDDP = 1 << 20,
723 ARM_HWCAP_A64_SHA512 = 1 << 21,
724 ARM_HWCAP_A64_SVE = 1 << 22,
725 ARM_HWCAP_A64_ASIMDFHM = 1 << 23,
726 ARM_HWCAP_A64_DIT = 1 << 24,
727 ARM_HWCAP_A64_USCAT = 1 << 25,
728 ARM_HWCAP_A64_ILRCPC = 1 << 26,
729 ARM_HWCAP_A64_FLAGM = 1 << 27,
730 ARM_HWCAP_A64_SSBS = 1 << 28,
731 ARM_HWCAP_A64_SB = 1 << 29,
732 ARM_HWCAP_A64_PACA = 1 << 30,
733 ARM_HWCAP_A64_PACG = 1UL << 31,
734
735 ARM_HWCAP2_A64_DCPODP = 1 << 0,
736 ARM_HWCAP2_A64_SVE2 = 1 << 1,
737 ARM_HWCAP2_A64_SVEAES = 1 << 2,
738 ARM_HWCAP2_A64_SVEPMULL = 1 << 3,
739 ARM_HWCAP2_A64_SVEBITPERM = 1 << 4,
740 ARM_HWCAP2_A64_SVESHA3 = 1 << 5,
741 ARM_HWCAP2_A64_SVESM4 = 1 << 6,
742 ARM_HWCAP2_A64_FLAGM2 = 1 << 7,
743 ARM_HWCAP2_A64_FRINT = 1 << 8,
744 ARM_HWCAP2_A64_SVEI8MM = 1 << 9,
745 ARM_HWCAP2_A64_SVEF32MM = 1 << 10,
746 ARM_HWCAP2_A64_SVEF64MM = 1 << 11,
747 ARM_HWCAP2_A64_SVEBF16 = 1 << 12,
748 ARM_HWCAP2_A64_I8MM = 1 << 13,
749 ARM_HWCAP2_A64_BF16 = 1 << 14,
750 ARM_HWCAP2_A64_DGH = 1 << 15,
751 ARM_HWCAP2_A64_RNG = 1 << 16,
752 ARM_HWCAP2_A64_BTI = 1 << 17,
753 ARM_HWCAP2_A64_MTE = 1 << 18,
754 ARM_HWCAP2_A64_ECV = 1 << 19,
755 ARM_HWCAP2_A64_AFP = 1 << 20,
756 ARM_HWCAP2_A64_RPRES = 1 << 21,
757 ARM_HWCAP2_A64_MTE3 = 1 << 22,
758 ARM_HWCAP2_A64_SME = 1 << 23,
759 ARM_HWCAP2_A64_SME_I16I64 = 1 << 24,
760 ARM_HWCAP2_A64_SME_F64F64 = 1 << 25,
761 ARM_HWCAP2_A64_SME_I8I32 = 1 << 26,
762 ARM_HWCAP2_A64_SME_F16F32 = 1 << 27,
763 ARM_HWCAP2_A64_SME_B16F32 = 1 << 28,
764 ARM_HWCAP2_A64_SME_F32F32 = 1 << 29,
765 ARM_HWCAP2_A64_SME_FA64 = 1 << 30,
766 ARM_HWCAP2_A64_WFXT = 1ULL << 31,
767 ARM_HWCAP2_A64_EBF16 = 1ULL << 32,
768 ARM_HWCAP2_A64_SVE_EBF16 = 1ULL << 33,
769 ARM_HWCAP2_A64_CSSC = 1ULL << 34,
770 ARM_HWCAP2_A64_RPRFM = 1ULL << 35,
771 ARM_HWCAP2_A64_SVE2P1 = 1ULL << 36,
772 ARM_HWCAP2_A64_SME2 = 1ULL << 37,
773 ARM_HWCAP2_A64_SME2P1 = 1ULL << 38,
774 ARM_HWCAP2_A64_SME_I16I32 = 1ULL << 39,
775 ARM_HWCAP2_A64_SME_BI32I32 = 1ULL << 40,
776 ARM_HWCAP2_A64_SME_B16B16 = 1ULL << 41,
777 ARM_HWCAP2_A64_SME_F16F16 = 1ULL << 42,
778 ARM_HWCAP2_A64_MOPS = 1ULL << 43,
779 ARM_HWCAP2_A64_HBC = 1ULL << 44,
780 };
781
782 #define ELF_HWCAP get_elf_hwcap()
783 #define ELF_HWCAP2 get_elf_hwcap2()
784
785 #define GET_FEATURE_ID(feat, hwcap) \
786 do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0)
787
get_elf_hwcap(void)788 uint32_t get_elf_hwcap(void)
789 {
790 ARMCPU *cpu = ARM_CPU(thread_cpu);
791 uint32_t hwcaps = 0;
792
793 hwcaps |= ARM_HWCAP_A64_FP;
794 hwcaps |= ARM_HWCAP_A64_ASIMD;
795 hwcaps |= ARM_HWCAP_A64_CPUID;
796
797 /* probe for the extra features */
798
799 GET_FEATURE_ID(aa64_aes, ARM_HWCAP_A64_AES);
800 GET_FEATURE_ID(aa64_pmull, ARM_HWCAP_A64_PMULL);
801 GET_FEATURE_ID(aa64_sha1, ARM_HWCAP_A64_SHA1);
802 GET_FEATURE_ID(aa64_sha256, ARM_HWCAP_A64_SHA2);
803 GET_FEATURE_ID(aa64_sha512, ARM_HWCAP_A64_SHA512);
804 GET_FEATURE_ID(aa64_crc32, ARM_HWCAP_A64_CRC32);
805 GET_FEATURE_ID(aa64_sha3, ARM_HWCAP_A64_SHA3);
806 GET_FEATURE_ID(aa64_sm3, ARM_HWCAP_A64_SM3);
807 GET_FEATURE_ID(aa64_sm4, ARM_HWCAP_A64_SM4);
808 GET_FEATURE_ID(aa64_fp16, ARM_HWCAP_A64_FPHP | ARM_HWCAP_A64_ASIMDHP);
809 GET_FEATURE_ID(aa64_atomics, ARM_HWCAP_A64_ATOMICS);
810 GET_FEATURE_ID(aa64_lse2, ARM_HWCAP_A64_USCAT);
811 GET_FEATURE_ID(aa64_rdm, ARM_HWCAP_A64_ASIMDRDM);
812 GET_FEATURE_ID(aa64_dp, ARM_HWCAP_A64_ASIMDDP);
813 GET_FEATURE_ID(aa64_fcma, ARM_HWCAP_A64_FCMA);
814 GET_FEATURE_ID(aa64_sve, ARM_HWCAP_A64_SVE);
815 GET_FEATURE_ID(aa64_pauth, ARM_HWCAP_A64_PACA | ARM_HWCAP_A64_PACG);
816 GET_FEATURE_ID(aa64_fhm, ARM_HWCAP_A64_ASIMDFHM);
817 GET_FEATURE_ID(aa64_dit, ARM_HWCAP_A64_DIT);
818 GET_FEATURE_ID(aa64_jscvt, ARM_HWCAP_A64_JSCVT);
819 GET_FEATURE_ID(aa64_sb, ARM_HWCAP_A64_SB);
820 GET_FEATURE_ID(aa64_condm_4, ARM_HWCAP_A64_FLAGM);
821 GET_FEATURE_ID(aa64_dcpop, ARM_HWCAP_A64_DCPOP);
822 GET_FEATURE_ID(aa64_rcpc_8_3, ARM_HWCAP_A64_LRCPC);
823 GET_FEATURE_ID(aa64_rcpc_8_4, ARM_HWCAP_A64_ILRCPC);
824
825 return hwcaps;
826 }
827
get_elf_hwcap2(void)828 uint64_t get_elf_hwcap2(void)
829 {
830 ARMCPU *cpu = ARM_CPU(thread_cpu);
831 uint64_t hwcaps = 0;
832
833 GET_FEATURE_ID(aa64_dcpodp, ARM_HWCAP2_A64_DCPODP);
834 GET_FEATURE_ID(aa64_sve2, ARM_HWCAP2_A64_SVE2);
835 GET_FEATURE_ID(aa64_sve2_aes, ARM_HWCAP2_A64_SVEAES);
836 GET_FEATURE_ID(aa64_sve2_pmull128, ARM_HWCAP2_A64_SVEPMULL);
837 GET_FEATURE_ID(aa64_sve2_bitperm, ARM_HWCAP2_A64_SVEBITPERM);
838 GET_FEATURE_ID(aa64_sve2_sha3, ARM_HWCAP2_A64_SVESHA3);
839 GET_FEATURE_ID(aa64_sve2_sm4, ARM_HWCAP2_A64_SVESM4);
840 GET_FEATURE_ID(aa64_condm_5, ARM_HWCAP2_A64_FLAGM2);
841 GET_FEATURE_ID(aa64_frint, ARM_HWCAP2_A64_FRINT);
842 GET_FEATURE_ID(aa64_sve_i8mm, ARM_HWCAP2_A64_SVEI8MM);
843 GET_FEATURE_ID(aa64_sve_f32mm, ARM_HWCAP2_A64_SVEF32MM);
844 GET_FEATURE_ID(aa64_sve_f64mm, ARM_HWCAP2_A64_SVEF64MM);
845 GET_FEATURE_ID(aa64_sve_bf16, ARM_HWCAP2_A64_SVEBF16);
846 GET_FEATURE_ID(aa64_i8mm, ARM_HWCAP2_A64_I8MM);
847 GET_FEATURE_ID(aa64_bf16, ARM_HWCAP2_A64_BF16);
848 GET_FEATURE_ID(aa64_rndr, ARM_HWCAP2_A64_RNG);
849 GET_FEATURE_ID(aa64_bti, ARM_HWCAP2_A64_BTI);
850 GET_FEATURE_ID(aa64_mte, ARM_HWCAP2_A64_MTE);
851 GET_FEATURE_ID(aa64_mte3, ARM_HWCAP2_A64_MTE3);
852 GET_FEATURE_ID(aa64_sme, (ARM_HWCAP2_A64_SME |
853 ARM_HWCAP2_A64_SME_F32F32 |
854 ARM_HWCAP2_A64_SME_B16F32 |
855 ARM_HWCAP2_A64_SME_F16F32 |
856 ARM_HWCAP2_A64_SME_I8I32));
857 GET_FEATURE_ID(aa64_sme_f64f64, ARM_HWCAP2_A64_SME_F64F64);
858 GET_FEATURE_ID(aa64_sme_i16i64, ARM_HWCAP2_A64_SME_I16I64);
859 GET_FEATURE_ID(aa64_sme_fa64, ARM_HWCAP2_A64_SME_FA64);
860 GET_FEATURE_ID(aa64_hbc, ARM_HWCAP2_A64_HBC);
861 GET_FEATURE_ID(aa64_mops, ARM_HWCAP2_A64_MOPS);
862
863 return hwcaps;
864 }
865
elf_hwcap_str(uint32_t bit)866 const char *elf_hwcap_str(uint32_t bit)
867 {
868 static const char *hwcap_str[] = {
869 [__builtin_ctz(ARM_HWCAP_A64_FP )] = "fp",
870 [__builtin_ctz(ARM_HWCAP_A64_ASIMD )] = "asimd",
871 [__builtin_ctz(ARM_HWCAP_A64_EVTSTRM )] = "evtstrm",
872 [__builtin_ctz(ARM_HWCAP_A64_AES )] = "aes",
873 [__builtin_ctz(ARM_HWCAP_A64_PMULL )] = "pmull",
874 [__builtin_ctz(ARM_HWCAP_A64_SHA1 )] = "sha1",
875 [__builtin_ctz(ARM_HWCAP_A64_SHA2 )] = "sha2",
876 [__builtin_ctz(ARM_HWCAP_A64_CRC32 )] = "crc32",
877 [__builtin_ctz(ARM_HWCAP_A64_ATOMICS )] = "atomics",
878 [__builtin_ctz(ARM_HWCAP_A64_FPHP )] = "fphp",
879 [__builtin_ctz(ARM_HWCAP_A64_ASIMDHP )] = "asimdhp",
880 [__builtin_ctz(ARM_HWCAP_A64_CPUID )] = "cpuid",
881 [__builtin_ctz(ARM_HWCAP_A64_ASIMDRDM)] = "asimdrdm",
882 [__builtin_ctz(ARM_HWCAP_A64_JSCVT )] = "jscvt",
883 [__builtin_ctz(ARM_HWCAP_A64_FCMA )] = "fcma",
884 [__builtin_ctz(ARM_HWCAP_A64_LRCPC )] = "lrcpc",
885 [__builtin_ctz(ARM_HWCAP_A64_DCPOP )] = "dcpop",
886 [__builtin_ctz(ARM_HWCAP_A64_SHA3 )] = "sha3",
887 [__builtin_ctz(ARM_HWCAP_A64_SM3 )] = "sm3",
888 [__builtin_ctz(ARM_HWCAP_A64_SM4 )] = "sm4",
889 [__builtin_ctz(ARM_HWCAP_A64_ASIMDDP )] = "asimddp",
890 [__builtin_ctz(ARM_HWCAP_A64_SHA512 )] = "sha512",
891 [__builtin_ctz(ARM_HWCAP_A64_SVE )] = "sve",
892 [__builtin_ctz(ARM_HWCAP_A64_ASIMDFHM)] = "asimdfhm",
893 [__builtin_ctz(ARM_HWCAP_A64_DIT )] = "dit",
894 [__builtin_ctz(ARM_HWCAP_A64_USCAT )] = "uscat",
895 [__builtin_ctz(ARM_HWCAP_A64_ILRCPC )] = "ilrcpc",
896 [__builtin_ctz(ARM_HWCAP_A64_FLAGM )] = "flagm",
897 [__builtin_ctz(ARM_HWCAP_A64_SSBS )] = "ssbs",
898 [__builtin_ctz(ARM_HWCAP_A64_SB )] = "sb",
899 [__builtin_ctz(ARM_HWCAP_A64_PACA )] = "paca",
900 [__builtin_ctz(ARM_HWCAP_A64_PACG )] = "pacg",
901 };
902
903 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
904 }
905
elf_hwcap2_str(uint32_t bit)906 const char *elf_hwcap2_str(uint32_t bit)
907 {
908 static const char *hwcap_str[] = {
909 [__builtin_ctz(ARM_HWCAP2_A64_DCPODP )] = "dcpodp",
910 [__builtin_ctz(ARM_HWCAP2_A64_SVE2 )] = "sve2",
911 [__builtin_ctz(ARM_HWCAP2_A64_SVEAES )] = "sveaes",
912 [__builtin_ctz(ARM_HWCAP2_A64_SVEPMULL )] = "svepmull",
913 [__builtin_ctz(ARM_HWCAP2_A64_SVEBITPERM )] = "svebitperm",
914 [__builtin_ctz(ARM_HWCAP2_A64_SVESHA3 )] = "svesha3",
915 [__builtin_ctz(ARM_HWCAP2_A64_SVESM4 )] = "svesm4",
916 [__builtin_ctz(ARM_HWCAP2_A64_FLAGM2 )] = "flagm2",
917 [__builtin_ctz(ARM_HWCAP2_A64_FRINT )] = "frint",
918 [__builtin_ctz(ARM_HWCAP2_A64_SVEI8MM )] = "svei8mm",
919 [__builtin_ctz(ARM_HWCAP2_A64_SVEF32MM )] = "svef32mm",
920 [__builtin_ctz(ARM_HWCAP2_A64_SVEF64MM )] = "svef64mm",
921 [__builtin_ctz(ARM_HWCAP2_A64_SVEBF16 )] = "svebf16",
922 [__builtin_ctz(ARM_HWCAP2_A64_I8MM )] = "i8mm",
923 [__builtin_ctz(ARM_HWCAP2_A64_BF16 )] = "bf16",
924 [__builtin_ctz(ARM_HWCAP2_A64_DGH )] = "dgh",
925 [__builtin_ctz(ARM_HWCAP2_A64_RNG )] = "rng",
926 [__builtin_ctz(ARM_HWCAP2_A64_BTI )] = "bti",
927 [__builtin_ctz(ARM_HWCAP2_A64_MTE )] = "mte",
928 [__builtin_ctz(ARM_HWCAP2_A64_ECV )] = "ecv",
929 [__builtin_ctz(ARM_HWCAP2_A64_AFP )] = "afp",
930 [__builtin_ctz(ARM_HWCAP2_A64_RPRES )] = "rpres",
931 [__builtin_ctz(ARM_HWCAP2_A64_MTE3 )] = "mte3",
932 [__builtin_ctz(ARM_HWCAP2_A64_SME )] = "sme",
933 [__builtin_ctz(ARM_HWCAP2_A64_SME_I16I64 )] = "smei16i64",
934 [__builtin_ctz(ARM_HWCAP2_A64_SME_F64F64 )] = "smef64f64",
935 [__builtin_ctz(ARM_HWCAP2_A64_SME_I8I32 )] = "smei8i32",
936 [__builtin_ctz(ARM_HWCAP2_A64_SME_F16F32 )] = "smef16f32",
937 [__builtin_ctz(ARM_HWCAP2_A64_SME_B16F32 )] = "smeb16f32",
938 [__builtin_ctz(ARM_HWCAP2_A64_SME_F32F32 )] = "smef32f32",
939 [__builtin_ctz(ARM_HWCAP2_A64_SME_FA64 )] = "smefa64",
940 [__builtin_ctz(ARM_HWCAP2_A64_WFXT )] = "wfxt",
941 [__builtin_ctzll(ARM_HWCAP2_A64_EBF16 )] = "ebf16",
942 [__builtin_ctzll(ARM_HWCAP2_A64_SVE_EBF16 )] = "sveebf16",
943 [__builtin_ctzll(ARM_HWCAP2_A64_CSSC )] = "cssc",
944 [__builtin_ctzll(ARM_HWCAP2_A64_RPRFM )] = "rprfm",
945 [__builtin_ctzll(ARM_HWCAP2_A64_SVE2P1 )] = "sve2p1",
946 [__builtin_ctzll(ARM_HWCAP2_A64_SME2 )] = "sme2",
947 [__builtin_ctzll(ARM_HWCAP2_A64_SME2P1 )] = "sme2p1",
948 [__builtin_ctzll(ARM_HWCAP2_A64_SME_I16I32 )] = "smei16i32",
949 [__builtin_ctzll(ARM_HWCAP2_A64_SME_BI32I32)] = "smebi32i32",
950 [__builtin_ctzll(ARM_HWCAP2_A64_SME_B16B16 )] = "smeb16b16",
951 [__builtin_ctzll(ARM_HWCAP2_A64_SME_F16F16 )] = "smef16f16",
952 [__builtin_ctzll(ARM_HWCAP2_A64_MOPS )] = "mops",
953 [__builtin_ctzll(ARM_HWCAP2_A64_HBC )] = "hbc",
954 };
955
956 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
957 }
958
959 #undef GET_FEATURE_ID
960
961 #endif /* not TARGET_AARCH64 */
962
963 #if TARGET_BIG_ENDIAN
964 # define VDSO_HEADER "vdso-be.c.inc"
965 #else
966 # define VDSO_HEADER "vdso-le.c.inc"
967 #endif
968
969 #endif /* TARGET_ARM */
970
971 #ifdef TARGET_SPARC
972
973 #ifndef TARGET_SPARC64
974 # define ELF_CLASS ELFCLASS32
975 # define ELF_ARCH EM_SPARC
976 #elif defined(TARGET_ABI32)
977 # define ELF_CLASS ELFCLASS32
978 # define elf_check_arch(x) ((x) == EM_SPARC32PLUS || (x) == EM_SPARC)
979 #else
980 # define ELF_CLASS ELFCLASS64
981 # define ELF_ARCH EM_SPARCV9
982 #endif
983
984 #include "elf.h"
985
986 #define ELF_HWCAP get_elf_hwcap()
987
get_elf_hwcap(void)988 static uint32_t get_elf_hwcap(void)
989 {
990 /* There are not many sparc32 hwcap bits -- we have all of them. */
991 uint32_t r = HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR |
992 HWCAP_SPARC_SWAP | HWCAP_SPARC_MULDIV;
993
994 #ifdef TARGET_SPARC64
995 CPUSPARCState *env = cpu_env(thread_cpu);
996 uint32_t features = env->def.features;
997
998 r |= HWCAP_SPARC_V9 | HWCAP_SPARC_V8PLUS;
999 /* 32x32 multiply and divide are efficient. */
1000 r |= HWCAP_SPARC_MUL32 | HWCAP_SPARC_DIV32;
1001 /* We don't have an internal feature bit for this. */
1002 r |= HWCAP_SPARC_POPC;
1003 r |= features & CPU_FEATURE_FSMULD ? HWCAP_SPARC_FSMULD : 0;
1004 r |= features & CPU_FEATURE_VIS1 ? HWCAP_SPARC_VIS : 0;
1005 r |= features & CPU_FEATURE_VIS2 ? HWCAP_SPARC_VIS2 : 0;
1006 r |= features & CPU_FEATURE_FMAF ? HWCAP_SPARC_FMAF : 0;
1007 r |= features & CPU_FEATURE_VIS3 ? HWCAP_SPARC_VIS3 : 0;
1008 r |= features & CPU_FEATURE_IMA ? HWCAP_SPARC_IMA : 0;
1009 #endif
1010
1011 return r;
1012 }
1013
init_thread(struct target_pt_regs * regs,struct image_info * infop)1014 static inline void init_thread(struct target_pt_regs *regs,
1015 struct image_info *infop)
1016 {
1017 /* Note that target_cpu_copy_regs does not read psr/tstate. */
1018 regs->pc = infop->entry;
1019 regs->npc = regs->pc + 4;
1020 regs->y = 0;
1021 regs->u_regs[14] = (infop->start_stack - 16 * sizeof(abi_ulong)
1022 - TARGET_STACK_BIAS);
1023 }
1024 #endif /* TARGET_SPARC */
1025
1026 #ifdef TARGET_PPC
1027
1028 #define ELF_MACHINE PPC_ELF_MACHINE
1029
1030 #if defined(TARGET_PPC64)
1031
1032 #define elf_check_arch(x) ( (x) == EM_PPC64 )
1033
1034 #define ELF_CLASS ELFCLASS64
1035
1036 #else
1037
1038 #define ELF_CLASS ELFCLASS32
1039 #define EXSTACK_DEFAULT true
1040
1041 #endif
1042
1043 #define ELF_ARCH EM_PPC
1044
1045 /* Feature masks for the Aux Vector Hardware Capabilities (AT_HWCAP).
1046 See arch/powerpc/include/asm/cputable.h. */
1047 enum {
1048 QEMU_PPC_FEATURE_32 = 0x80000000,
1049 QEMU_PPC_FEATURE_64 = 0x40000000,
1050 QEMU_PPC_FEATURE_601_INSTR = 0x20000000,
1051 QEMU_PPC_FEATURE_HAS_ALTIVEC = 0x10000000,
1052 QEMU_PPC_FEATURE_HAS_FPU = 0x08000000,
1053 QEMU_PPC_FEATURE_HAS_MMU = 0x04000000,
1054 QEMU_PPC_FEATURE_HAS_4xxMAC = 0x02000000,
1055 QEMU_PPC_FEATURE_UNIFIED_CACHE = 0x01000000,
1056 QEMU_PPC_FEATURE_HAS_SPE = 0x00800000,
1057 QEMU_PPC_FEATURE_HAS_EFP_SINGLE = 0x00400000,
1058 QEMU_PPC_FEATURE_HAS_EFP_DOUBLE = 0x00200000,
1059 QEMU_PPC_FEATURE_NO_TB = 0x00100000,
1060 QEMU_PPC_FEATURE_POWER4 = 0x00080000,
1061 QEMU_PPC_FEATURE_POWER5 = 0x00040000,
1062 QEMU_PPC_FEATURE_POWER5_PLUS = 0x00020000,
1063 QEMU_PPC_FEATURE_CELL = 0x00010000,
1064 QEMU_PPC_FEATURE_BOOKE = 0x00008000,
1065 QEMU_PPC_FEATURE_SMT = 0x00004000,
1066 QEMU_PPC_FEATURE_ICACHE_SNOOP = 0x00002000,
1067 QEMU_PPC_FEATURE_ARCH_2_05 = 0x00001000,
1068 QEMU_PPC_FEATURE_PA6T = 0x00000800,
1069 QEMU_PPC_FEATURE_HAS_DFP = 0x00000400,
1070 QEMU_PPC_FEATURE_POWER6_EXT = 0x00000200,
1071 QEMU_PPC_FEATURE_ARCH_2_06 = 0x00000100,
1072 QEMU_PPC_FEATURE_HAS_VSX = 0x00000080,
1073 QEMU_PPC_FEATURE_PSERIES_PERFMON_COMPAT = 0x00000040,
1074
1075 QEMU_PPC_FEATURE_TRUE_LE = 0x00000002,
1076 QEMU_PPC_FEATURE_PPC_LE = 0x00000001,
1077
1078 /* Feature definitions in AT_HWCAP2. */
1079 QEMU_PPC_FEATURE2_ARCH_2_07 = 0x80000000, /* ISA 2.07 */
1080 QEMU_PPC_FEATURE2_HAS_HTM = 0x40000000, /* Hardware Transactional Memory */
1081 QEMU_PPC_FEATURE2_HAS_DSCR = 0x20000000, /* Data Stream Control Register */
1082 QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */
1083 QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */
1084 QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */
1085 QEMU_PPC_FEATURE2_VEC_CRYPTO = 0x02000000,
1086 QEMU_PPC_FEATURE2_HTM_NOSC = 0x01000000,
1087 QEMU_PPC_FEATURE2_ARCH_3_00 = 0x00800000, /* ISA 3.00 */
1088 QEMU_PPC_FEATURE2_HAS_IEEE128 = 0x00400000, /* VSX IEEE Bin Float 128-bit */
1089 QEMU_PPC_FEATURE2_DARN = 0x00200000, /* darn random number insn */
1090 QEMU_PPC_FEATURE2_SCV = 0x00100000, /* scv syscall */
1091 QEMU_PPC_FEATURE2_HTM_NO_SUSPEND = 0x00080000, /* TM w/o suspended state */
1092 QEMU_PPC_FEATURE2_ARCH_3_1 = 0x00040000, /* ISA 3.1 */
1093 QEMU_PPC_FEATURE2_MMA = 0x00020000, /* Matrix-Multiply Assist */
1094 };
1095
1096 #define ELF_HWCAP get_elf_hwcap()
1097
get_elf_hwcap(void)1098 static uint32_t get_elf_hwcap(void)
1099 {
1100 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);
1101 uint32_t features = 0;
1102
1103 /* We don't have to be terribly complete here; the high points are
1104 Altivec/FP/SPE support. Anything else is just a bonus. */
1105 #define GET_FEATURE(flag, feature) \
1106 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0)
1107 #define GET_FEATURE2(flags, feature) \
1108 do { \
1109 if ((cpu->env.insns_flags2 & flags) == flags) { \
1110 features |= feature; \
1111 } \
1112 } while (0)
1113 GET_FEATURE(PPC_64B, QEMU_PPC_FEATURE_64);
1114 GET_FEATURE(PPC_FLOAT, QEMU_PPC_FEATURE_HAS_FPU);
1115 GET_FEATURE(PPC_ALTIVEC, QEMU_PPC_FEATURE_HAS_ALTIVEC);
1116 GET_FEATURE(PPC_SPE, QEMU_PPC_FEATURE_HAS_SPE);
1117 GET_FEATURE(PPC_SPE_SINGLE, QEMU_PPC_FEATURE_HAS_EFP_SINGLE);
1118 GET_FEATURE(PPC_SPE_DOUBLE, QEMU_PPC_FEATURE_HAS_EFP_DOUBLE);
1119 GET_FEATURE(PPC_BOOKE, QEMU_PPC_FEATURE_BOOKE);
1120 GET_FEATURE(PPC_405_MAC, QEMU_PPC_FEATURE_HAS_4xxMAC);
1121 GET_FEATURE2(PPC2_DFP, QEMU_PPC_FEATURE_HAS_DFP);
1122 GET_FEATURE2(PPC2_VSX, QEMU_PPC_FEATURE_HAS_VSX);
1123 GET_FEATURE2((PPC2_PERM_ISA206 | PPC2_DIVE_ISA206 | PPC2_ATOMIC_ISA206 |
1124 PPC2_FP_CVT_ISA206 | PPC2_FP_TST_ISA206),
1125 QEMU_PPC_FEATURE_ARCH_2_06);
1126 #undef GET_FEATURE
1127 #undef GET_FEATURE2
1128
1129 return features;
1130 }
1131
1132 #define ELF_HWCAP2 get_elf_hwcap2()
1133
get_elf_hwcap2(void)1134 static uint32_t get_elf_hwcap2(void)
1135 {
1136 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);
1137 uint32_t features = 0;
1138
1139 #define GET_FEATURE(flag, feature) \
1140 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0)
1141 #define GET_FEATURE2(flag, feature) \
1142 do { if (cpu->env.insns_flags2 & flag) { features |= feature; } } while (0)
1143
1144 GET_FEATURE(PPC_ISEL, QEMU_PPC_FEATURE2_HAS_ISEL);
1145 GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR);
1146 GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
1147 PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07 |
1148 QEMU_PPC_FEATURE2_VEC_CRYPTO);
1149 GET_FEATURE2(PPC2_ISA300, QEMU_PPC_FEATURE2_ARCH_3_00 |
1150 QEMU_PPC_FEATURE2_DARN | QEMU_PPC_FEATURE2_HAS_IEEE128);
1151 GET_FEATURE2(PPC2_ISA310, QEMU_PPC_FEATURE2_ARCH_3_1 |
1152 QEMU_PPC_FEATURE2_MMA);
1153
1154 #undef GET_FEATURE
1155 #undef GET_FEATURE2
1156
1157 return features;
1158 }
1159
1160 /*
1161 * The requirements here are:
1162 * - keep the final alignment of sp (sp & 0xf)
1163 * - make sure the 32-bit value at the first 16 byte aligned position of
1164 * AUXV is greater than 16 for glibc compatibility.
1165 * AT_IGNOREPPC is used for that.
1166 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
1167 * even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
1168 */
1169 #define DLINFO_ARCH_ITEMS 5
1170 #define ARCH_DLINFO \
1171 do { \
1172 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu); \
1173 /* \
1174 * Handle glibc compatibility: these magic entries must \
1175 * be at the lowest addresses in the final auxv. \
1176 */ \
1177 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
1178 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
1179 NEW_AUX_ENT(AT_DCACHEBSIZE, cpu->env.dcache_line_size); \
1180 NEW_AUX_ENT(AT_ICACHEBSIZE, cpu->env.icache_line_size); \
1181 NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \
1182 } while (0)
1183
init_thread(struct target_pt_regs * _regs,struct image_info * infop)1184 static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
1185 {
1186 _regs->gpr[1] = infop->start_stack;
1187 #if defined(TARGET_PPC64)
1188 if (get_ppc64_abi(infop) < 2) {
1189 uint64_t val;
1190 get_user_u64(val, infop->entry + 8);
1191 _regs->gpr[2] = val + infop->load_bias;
1192 get_user_u64(val, infop->entry);
1193 infop->entry = val + infop->load_bias;
1194 } else {
1195 _regs->gpr[12] = infop->entry; /* r12 set to global entry address */
1196 }
1197 #endif
1198 _regs->nip = infop->entry;
1199 }
1200
1201 /* See linux kernel: arch/powerpc/include/asm/elf.h. */
1202 #define ELF_NREG 48
1203 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1204
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUPPCState * env)1205 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUPPCState *env)
1206 {
1207 int i;
1208 target_ulong ccr = 0;
1209
1210 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
1211 (*regs)[i] = tswapreg(env->gpr[i]);
1212 }
1213
1214 (*regs)[32] = tswapreg(env->nip);
1215 (*regs)[33] = tswapreg(env->msr);
1216 (*regs)[35] = tswapreg(env->ctr);
1217 (*regs)[36] = tswapreg(env->lr);
1218 (*regs)[37] = tswapreg(cpu_read_xer(env));
1219
1220 ccr = ppc_get_cr(env);
1221 (*regs)[38] = tswapreg(ccr);
1222 }
1223
1224 #define USE_ELF_CORE_DUMP
1225 #define ELF_EXEC_PAGESIZE 4096
1226
1227 #ifndef TARGET_PPC64
1228 # define VDSO_HEADER "vdso-32.c.inc"
1229 #elif TARGET_BIG_ENDIAN
1230 # define VDSO_HEADER "vdso-64.c.inc"
1231 #else
1232 # define VDSO_HEADER "vdso-64le.c.inc"
1233 #endif
1234
1235 #endif
1236
1237 #ifdef TARGET_LOONGARCH64
1238
1239 #define ELF_CLASS ELFCLASS64
1240 #define ELF_ARCH EM_LOONGARCH
1241 #define EXSTACK_DEFAULT true
1242
1243 #define elf_check_arch(x) ((x) == EM_LOONGARCH)
1244
1245 #define VDSO_HEADER "vdso.c.inc"
1246
init_thread(struct target_pt_regs * regs,struct image_info * infop)1247 static inline void init_thread(struct target_pt_regs *regs,
1248 struct image_info *infop)
1249 {
1250 /*Set crmd PG,DA = 1,0 */
1251 regs->csr.crmd = 2 << 3;
1252 regs->csr.era = infop->entry;
1253 regs->regs[3] = infop->start_stack;
1254 }
1255
1256 /* See linux kernel: arch/loongarch/include/asm/elf.h */
1257 #define ELF_NREG 45
1258 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1259
1260 enum {
1261 TARGET_EF_R0 = 0,
1262 TARGET_EF_CSR_ERA = TARGET_EF_R0 + 33,
1263 TARGET_EF_CSR_BADV = TARGET_EF_R0 + 34,
1264 };
1265
elf_core_copy_regs(target_elf_gregset_t * regs,const CPULoongArchState * env)1266 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1267 const CPULoongArchState *env)
1268 {
1269 int i;
1270
1271 (*regs)[TARGET_EF_R0] = 0;
1272
1273 for (i = 1; i < ARRAY_SIZE(env->gpr); i++) {
1274 (*regs)[TARGET_EF_R0 + i] = tswapreg(env->gpr[i]);
1275 }
1276
1277 (*regs)[TARGET_EF_CSR_ERA] = tswapreg(env->pc);
1278 (*regs)[TARGET_EF_CSR_BADV] = tswapreg(env->CSR_BADV);
1279 }
1280
1281 #define USE_ELF_CORE_DUMP
1282 #define ELF_EXEC_PAGESIZE 4096
1283
1284 #define ELF_HWCAP get_elf_hwcap()
1285
1286 /* See arch/loongarch/include/uapi/asm/hwcap.h */
1287 enum {
1288 HWCAP_LOONGARCH_CPUCFG = (1 << 0),
1289 HWCAP_LOONGARCH_LAM = (1 << 1),
1290 HWCAP_LOONGARCH_UAL = (1 << 2),
1291 HWCAP_LOONGARCH_FPU = (1 << 3),
1292 HWCAP_LOONGARCH_LSX = (1 << 4),
1293 HWCAP_LOONGARCH_LASX = (1 << 5),
1294 HWCAP_LOONGARCH_CRC32 = (1 << 6),
1295 HWCAP_LOONGARCH_COMPLEX = (1 << 7),
1296 HWCAP_LOONGARCH_CRYPTO = (1 << 8),
1297 HWCAP_LOONGARCH_LVZ = (1 << 9),
1298 HWCAP_LOONGARCH_LBT_X86 = (1 << 10),
1299 HWCAP_LOONGARCH_LBT_ARM = (1 << 11),
1300 HWCAP_LOONGARCH_LBT_MIPS = (1 << 12),
1301 };
1302
get_elf_hwcap(void)1303 static uint32_t get_elf_hwcap(void)
1304 {
1305 LoongArchCPU *cpu = LOONGARCH_CPU(thread_cpu);
1306 uint32_t hwcaps = 0;
1307
1308 hwcaps |= HWCAP_LOONGARCH_CRC32;
1309
1310 if (FIELD_EX32(cpu->env.cpucfg[1], CPUCFG1, UAL)) {
1311 hwcaps |= HWCAP_LOONGARCH_UAL;
1312 }
1313
1314 if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, FP)) {
1315 hwcaps |= HWCAP_LOONGARCH_FPU;
1316 }
1317
1318 if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LAM)) {
1319 hwcaps |= HWCAP_LOONGARCH_LAM;
1320 }
1321
1322 if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LSX)) {
1323 hwcaps |= HWCAP_LOONGARCH_LSX;
1324 }
1325
1326 if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LASX)) {
1327 hwcaps |= HWCAP_LOONGARCH_LASX;
1328 }
1329
1330 return hwcaps;
1331 }
1332
1333 #define ELF_PLATFORM "loongarch"
1334
1335 #endif /* TARGET_LOONGARCH64 */
1336
1337 #ifdef TARGET_MIPS
1338
1339 #ifdef TARGET_MIPS64
1340 #define ELF_CLASS ELFCLASS64
1341 #else
1342 #define ELF_CLASS ELFCLASS32
1343 #endif
1344 #define ELF_ARCH EM_MIPS
1345 #define EXSTACK_DEFAULT true
1346
1347 #ifdef TARGET_ABI_MIPSN32
1348 #define elf_check_abi(x) ((x) & EF_MIPS_ABI2)
1349 #else
1350 #define elf_check_abi(x) (!((x) & EF_MIPS_ABI2))
1351 #endif
1352
1353 #define ELF_BASE_PLATFORM get_elf_base_platform()
1354
1355 #define MATCH_PLATFORM_INSN(_flags, _base_platform) \
1356 do { if ((cpu->env.insn_flags & (_flags)) == _flags) \
1357 { return _base_platform; } } while (0)
1358
get_elf_base_platform(void)1359 static const char *get_elf_base_platform(void)
1360 {
1361 MIPSCPU *cpu = MIPS_CPU(thread_cpu);
1362
1363 /* 64 bit ISAs goes first */
1364 MATCH_PLATFORM_INSN(CPU_MIPS64R6, "mips64r6");
1365 MATCH_PLATFORM_INSN(CPU_MIPS64R5, "mips64r5");
1366 MATCH_PLATFORM_INSN(CPU_MIPS64R2, "mips64r2");
1367 MATCH_PLATFORM_INSN(CPU_MIPS64R1, "mips64");
1368 MATCH_PLATFORM_INSN(CPU_MIPS5, "mips5");
1369 MATCH_PLATFORM_INSN(CPU_MIPS4, "mips4");
1370 MATCH_PLATFORM_INSN(CPU_MIPS3, "mips3");
1371
1372 /* 32 bit ISAs */
1373 MATCH_PLATFORM_INSN(CPU_MIPS32R6, "mips32r6");
1374 MATCH_PLATFORM_INSN(CPU_MIPS32R5, "mips32r5");
1375 MATCH_PLATFORM_INSN(CPU_MIPS32R2, "mips32r2");
1376 MATCH_PLATFORM_INSN(CPU_MIPS32R1, "mips32");
1377 MATCH_PLATFORM_INSN(CPU_MIPS2, "mips2");
1378
1379 /* Fallback */
1380 return "mips";
1381 }
1382 #undef MATCH_PLATFORM_INSN
1383
init_thread(struct target_pt_regs * regs,struct image_info * infop)1384 static inline void init_thread(struct target_pt_regs *regs,
1385 struct image_info *infop)
1386 {
1387 regs->cp0_status = 2 << CP0St_KSU;
1388 regs->cp0_epc = infop->entry;
1389 regs->regs[29] = infop->start_stack;
1390 }
1391
1392 /* See linux kernel: arch/mips/include/asm/elf.h. */
1393 #define ELF_NREG 45
1394 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1395
1396 /* See linux kernel: arch/mips/include/asm/reg.h. */
1397 enum {
1398 #ifdef TARGET_MIPS64
1399 TARGET_EF_R0 = 0,
1400 #else
1401 TARGET_EF_R0 = 6,
1402 #endif
1403 TARGET_EF_R26 = TARGET_EF_R0 + 26,
1404 TARGET_EF_R27 = TARGET_EF_R0 + 27,
1405 TARGET_EF_LO = TARGET_EF_R0 + 32,
1406 TARGET_EF_HI = TARGET_EF_R0 + 33,
1407 TARGET_EF_CP0_EPC = TARGET_EF_R0 + 34,
1408 TARGET_EF_CP0_BADVADDR = TARGET_EF_R0 + 35,
1409 TARGET_EF_CP0_STATUS = TARGET_EF_R0 + 36,
1410 TARGET_EF_CP0_CAUSE = TARGET_EF_R0 + 37
1411 };
1412
1413 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUMIPSState * env)1414 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMIPSState *env)
1415 {
1416 int i;
1417
1418 for (i = 0; i < TARGET_EF_R0; i++) {
1419 (*regs)[i] = 0;
1420 }
1421 (*regs)[TARGET_EF_R0] = 0;
1422
1423 for (i = 1; i < ARRAY_SIZE(env->active_tc.gpr); i++) {
1424 (*regs)[TARGET_EF_R0 + i] = tswapreg(env->active_tc.gpr[i]);
1425 }
1426
1427 (*regs)[TARGET_EF_R26] = 0;
1428 (*regs)[TARGET_EF_R27] = 0;
1429 (*regs)[TARGET_EF_LO] = tswapreg(env->active_tc.LO[0]);
1430 (*regs)[TARGET_EF_HI] = tswapreg(env->active_tc.HI[0]);
1431 (*regs)[TARGET_EF_CP0_EPC] = tswapreg(env->active_tc.PC);
1432 (*regs)[TARGET_EF_CP0_BADVADDR] = tswapreg(env->CP0_BadVAddr);
1433 (*regs)[TARGET_EF_CP0_STATUS] = tswapreg(env->CP0_Status);
1434 (*regs)[TARGET_EF_CP0_CAUSE] = tswapreg(env->CP0_Cause);
1435 }
1436
1437 #define USE_ELF_CORE_DUMP
1438 #define ELF_EXEC_PAGESIZE 4096
1439
1440 /* See arch/mips/include/uapi/asm/hwcap.h. */
1441 enum {
1442 HWCAP_MIPS_R6 = (1 << 0),
1443 HWCAP_MIPS_MSA = (1 << 1),
1444 HWCAP_MIPS_CRC32 = (1 << 2),
1445 HWCAP_MIPS_MIPS16 = (1 << 3),
1446 HWCAP_MIPS_MDMX = (1 << 4),
1447 HWCAP_MIPS_MIPS3D = (1 << 5),
1448 HWCAP_MIPS_SMARTMIPS = (1 << 6),
1449 HWCAP_MIPS_DSP = (1 << 7),
1450 HWCAP_MIPS_DSP2 = (1 << 8),
1451 HWCAP_MIPS_DSP3 = (1 << 9),
1452 HWCAP_MIPS_MIPS16E2 = (1 << 10),
1453 HWCAP_LOONGSON_MMI = (1 << 11),
1454 HWCAP_LOONGSON_EXT = (1 << 12),
1455 HWCAP_LOONGSON_EXT2 = (1 << 13),
1456 HWCAP_LOONGSON_CPUCFG = (1 << 14),
1457 };
1458
1459 #define ELF_HWCAP get_elf_hwcap()
1460
1461 #define GET_FEATURE_INSN(_flag, _hwcap) \
1462 do { if (cpu->env.insn_flags & (_flag)) { hwcaps |= _hwcap; } } while (0)
1463
1464 #define GET_FEATURE_REG_SET(_reg, _mask, _hwcap) \
1465 do { if (cpu->env._reg & (_mask)) { hwcaps |= _hwcap; } } while (0)
1466
1467 #define GET_FEATURE_REG_EQU(_reg, _start, _length, _val, _hwcap) \
1468 do { \
1469 if (extract32(cpu->env._reg, (_start), (_length)) == (_val)) { \
1470 hwcaps |= _hwcap; \
1471 } \
1472 } while (0)
1473
get_elf_hwcap(void)1474 static uint32_t get_elf_hwcap(void)
1475 {
1476 MIPSCPU *cpu = MIPS_CPU(thread_cpu);
1477 uint32_t hwcaps = 0;
1478
1479 GET_FEATURE_REG_EQU(CP0_Config0, CP0C0_AR, CP0C0_AR_LENGTH,
1480 2, HWCAP_MIPS_R6);
1481 GET_FEATURE_REG_SET(CP0_Config3, 1 << CP0C3_MSAP, HWCAP_MIPS_MSA);
1482 GET_FEATURE_INSN(ASE_LMMI, HWCAP_LOONGSON_MMI);
1483 GET_FEATURE_INSN(ASE_LEXT, HWCAP_LOONGSON_EXT);
1484
1485 return hwcaps;
1486 }
1487
1488 #undef GET_FEATURE_REG_EQU
1489 #undef GET_FEATURE_REG_SET
1490 #undef GET_FEATURE_INSN
1491
1492 #endif /* TARGET_MIPS */
1493
1494 #ifdef TARGET_MICROBLAZE
1495
1496 #define elf_check_arch(x) ( (x) == EM_MICROBLAZE || (x) == EM_MICROBLAZE_OLD)
1497
1498 #define ELF_CLASS ELFCLASS32
1499 #define ELF_ARCH EM_MICROBLAZE
1500
init_thread(struct target_pt_regs * regs,struct image_info * infop)1501 static inline void init_thread(struct target_pt_regs *regs,
1502 struct image_info *infop)
1503 {
1504 regs->pc = infop->entry;
1505 regs->r1 = infop->start_stack;
1506
1507 }
1508
1509 #define ELF_EXEC_PAGESIZE 4096
1510
1511 #define USE_ELF_CORE_DUMP
1512 #define ELF_NREG 38
1513 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1514
1515 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUMBState * env)1516 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMBState *env)
1517 {
1518 int i, pos = 0;
1519
1520 for (i = 0; i < 32; i++) {
1521 (*regs)[pos++] = tswapreg(env->regs[i]);
1522 }
1523
1524 (*regs)[pos++] = tswapreg(env->pc);
1525 (*regs)[pos++] = tswapreg(mb_cpu_read_msr(env));
1526 (*regs)[pos++] = 0;
1527 (*regs)[pos++] = tswapreg(env->ear);
1528 (*regs)[pos++] = 0;
1529 (*regs)[pos++] = tswapreg(env->esr);
1530 }
1531
1532 #endif /* TARGET_MICROBLAZE */
1533
1534 #ifdef TARGET_OPENRISC
1535
1536 #define ELF_ARCH EM_OPENRISC
1537 #define ELF_CLASS ELFCLASS32
1538 #define ELF_DATA ELFDATA2MSB
1539
init_thread(struct target_pt_regs * regs,struct image_info * infop)1540 static inline void init_thread(struct target_pt_regs *regs,
1541 struct image_info *infop)
1542 {
1543 regs->pc = infop->entry;
1544 regs->gpr[1] = infop->start_stack;
1545 }
1546
1547 #define USE_ELF_CORE_DUMP
1548 #define ELF_EXEC_PAGESIZE 8192
1549
1550 /* See linux kernel arch/openrisc/include/asm/elf.h. */
1551 #define ELF_NREG 34 /* gprs and pc, sr */
1552 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1553
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUOpenRISCState * env)1554 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1555 const CPUOpenRISCState *env)
1556 {
1557 int i;
1558
1559 for (i = 0; i < 32; i++) {
1560 (*regs)[i] = tswapreg(cpu_get_gpr(env, i));
1561 }
1562 (*regs)[32] = tswapreg(env->pc);
1563 (*regs)[33] = tswapreg(cpu_get_sr(env));
1564 }
1565 #define ELF_HWCAP 0
1566 #define ELF_PLATFORM NULL
1567
1568 #endif /* TARGET_OPENRISC */
1569
1570 #ifdef TARGET_SH4
1571
1572 #define ELF_CLASS ELFCLASS32
1573 #define ELF_ARCH EM_SH
1574
init_thread(struct target_pt_regs * regs,struct image_info * infop)1575 static inline void init_thread(struct target_pt_regs *regs,
1576 struct image_info *infop)
1577 {
1578 /* Check other registers XXXXX */
1579 regs->pc = infop->entry;
1580 regs->regs[15] = infop->start_stack;
1581 }
1582
1583 /* See linux kernel: arch/sh/include/asm/elf.h. */
1584 #define ELF_NREG 23
1585 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1586
1587 /* See linux kernel: arch/sh/include/asm/ptrace.h. */
1588 enum {
1589 TARGET_REG_PC = 16,
1590 TARGET_REG_PR = 17,
1591 TARGET_REG_SR = 18,
1592 TARGET_REG_GBR = 19,
1593 TARGET_REG_MACH = 20,
1594 TARGET_REG_MACL = 21,
1595 TARGET_REG_SYSCALL = 22
1596 };
1597
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUSH4State * env)1598 static inline void elf_core_copy_regs(target_elf_gregset_t *regs,
1599 const CPUSH4State *env)
1600 {
1601 int i;
1602
1603 for (i = 0; i < 16; i++) {
1604 (*regs)[i] = tswapreg(env->gregs[i]);
1605 }
1606
1607 (*regs)[TARGET_REG_PC] = tswapreg(env->pc);
1608 (*regs)[TARGET_REG_PR] = tswapreg(env->pr);
1609 (*regs)[TARGET_REG_SR] = tswapreg(env->sr);
1610 (*regs)[TARGET_REG_GBR] = tswapreg(env->gbr);
1611 (*regs)[TARGET_REG_MACH] = tswapreg(env->mach);
1612 (*regs)[TARGET_REG_MACL] = tswapreg(env->macl);
1613 (*regs)[TARGET_REG_SYSCALL] = 0; /* FIXME */
1614 }
1615
1616 #define USE_ELF_CORE_DUMP
1617 #define ELF_EXEC_PAGESIZE 4096
1618
1619 enum {
1620 SH_CPU_HAS_FPU = 0x0001, /* Hardware FPU support */
1621 SH_CPU_HAS_P2_FLUSH_BUG = 0x0002, /* Need to flush the cache in P2 area */
1622 SH_CPU_HAS_MMU_PAGE_ASSOC = 0x0004, /* SH3: TLB way selection bit support */
1623 SH_CPU_HAS_DSP = 0x0008, /* SH-DSP: DSP support */
1624 SH_CPU_HAS_PERF_COUNTER = 0x0010, /* Hardware performance counters */
1625 SH_CPU_HAS_PTEA = 0x0020, /* PTEA register */
1626 SH_CPU_HAS_LLSC = 0x0040, /* movli.l/movco.l */
1627 SH_CPU_HAS_L2_CACHE = 0x0080, /* Secondary cache / URAM */
1628 SH_CPU_HAS_OP32 = 0x0100, /* 32-bit instruction support */
1629 SH_CPU_HAS_PTEAEX = 0x0200, /* PTE ASID Extension support */
1630 };
1631
1632 #define ELF_HWCAP get_elf_hwcap()
1633
get_elf_hwcap(void)1634 static uint32_t get_elf_hwcap(void)
1635 {
1636 SuperHCPU *cpu = SUPERH_CPU(thread_cpu);
1637 uint32_t hwcap = 0;
1638
1639 hwcap |= SH_CPU_HAS_FPU;
1640
1641 if (cpu->env.features & SH_FEATURE_SH4A) {
1642 hwcap |= SH_CPU_HAS_LLSC;
1643 }
1644
1645 return hwcap;
1646 }
1647
1648 #endif
1649
1650 #ifdef TARGET_CRIS
1651
1652 #define ELF_CLASS ELFCLASS32
1653 #define ELF_ARCH EM_CRIS
1654
init_thread(struct target_pt_regs * regs,struct image_info * infop)1655 static inline void init_thread(struct target_pt_regs *regs,
1656 struct image_info *infop)
1657 {
1658 regs->erp = infop->entry;
1659 }
1660
1661 #define ELF_EXEC_PAGESIZE 8192
1662
1663 #endif
1664
1665 #ifdef TARGET_M68K
1666
1667 #define ELF_CLASS ELFCLASS32
1668 #define ELF_ARCH EM_68K
1669
1670 /* ??? Does this need to do anything?
1671 #define ELF_PLAT_INIT(_r) */
1672
init_thread(struct target_pt_regs * regs,struct image_info * infop)1673 static inline void init_thread(struct target_pt_regs *regs,
1674 struct image_info *infop)
1675 {
1676 regs->usp = infop->start_stack;
1677 regs->sr = 0;
1678 regs->pc = infop->entry;
1679 }
1680
1681 /* See linux kernel: arch/m68k/include/asm/elf.h. */
1682 #define ELF_NREG 20
1683 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1684
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUM68KState * env)1685 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUM68KState *env)
1686 {
1687 (*regs)[0] = tswapreg(env->dregs[1]);
1688 (*regs)[1] = tswapreg(env->dregs[2]);
1689 (*regs)[2] = tswapreg(env->dregs[3]);
1690 (*regs)[3] = tswapreg(env->dregs[4]);
1691 (*regs)[4] = tswapreg(env->dregs[5]);
1692 (*regs)[5] = tswapreg(env->dregs[6]);
1693 (*regs)[6] = tswapreg(env->dregs[7]);
1694 (*regs)[7] = tswapreg(env->aregs[0]);
1695 (*regs)[8] = tswapreg(env->aregs[1]);
1696 (*regs)[9] = tswapreg(env->aregs[2]);
1697 (*regs)[10] = tswapreg(env->aregs[3]);
1698 (*regs)[11] = tswapreg(env->aregs[4]);
1699 (*regs)[12] = tswapreg(env->aregs[5]);
1700 (*regs)[13] = tswapreg(env->aregs[6]);
1701 (*regs)[14] = tswapreg(env->dregs[0]);
1702 (*regs)[15] = tswapreg(env->aregs[7]);
1703 (*regs)[16] = tswapreg(env->dregs[0]); /* FIXME: orig_d0 */
1704 (*regs)[17] = tswapreg(env->sr);
1705 (*regs)[18] = tswapreg(env->pc);
1706 (*regs)[19] = 0; /* FIXME: regs->format | regs->vector */
1707 }
1708
1709 #define USE_ELF_CORE_DUMP
1710 #define ELF_EXEC_PAGESIZE 8192
1711
1712 #endif
1713
1714 #ifdef TARGET_ALPHA
1715
1716 #define ELF_CLASS ELFCLASS64
1717 #define ELF_ARCH EM_ALPHA
1718
init_thread(struct target_pt_regs * regs,struct image_info * infop)1719 static inline void init_thread(struct target_pt_regs *regs,
1720 struct image_info *infop)
1721 {
1722 regs->pc = infop->entry;
1723 regs->ps = 8;
1724 regs->usp = infop->start_stack;
1725 }
1726
1727 #define ELF_EXEC_PAGESIZE 8192
1728
1729 #endif /* TARGET_ALPHA */
1730
1731 #ifdef TARGET_S390X
1732
1733 #define ELF_CLASS ELFCLASS64
1734 #define ELF_DATA ELFDATA2MSB
1735 #define ELF_ARCH EM_S390
1736
1737 #include "elf.h"
1738
1739 #define ELF_HWCAP get_elf_hwcap()
1740
1741 #define GET_FEATURE(_feat, _hwcap) \
1742 do { if (s390_has_feat(_feat)) { hwcap |= _hwcap; } } while (0)
1743
get_elf_hwcap(void)1744 uint32_t get_elf_hwcap(void)
1745 {
1746 /*
1747 * Let's assume we always have esan3 and zarch.
1748 * 31-bit processes can use 64-bit registers (high gprs).
1749 */
1750 uint32_t hwcap = HWCAP_S390_ESAN3 | HWCAP_S390_ZARCH | HWCAP_S390_HIGH_GPRS;
1751
1752 GET_FEATURE(S390_FEAT_STFLE, HWCAP_S390_STFLE);
1753 GET_FEATURE(S390_FEAT_MSA, HWCAP_S390_MSA);
1754 GET_FEATURE(S390_FEAT_LONG_DISPLACEMENT, HWCAP_S390_LDISP);
1755 GET_FEATURE(S390_FEAT_EXTENDED_IMMEDIATE, HWCAP_S390_EIMM);
1756 if (s390_has_feat(S390_FEAT_EXTENDED_TRANSLATION_3) &&
1757 s390_has_feat(S390_FEAT_ETF3_ENH)) {
1758 hwcap |= HWCAP_S390_ETF3EH;
1759 }
1760 GET_FEATURE(S390_FEAT_VECTOR, HWCAP_S390_VXRS);
1761 GET_FEATURE(S390_FEAT_VECTOR_ENH, HWCAP_S390_VXRS_EXT);
1762 GET_FEATURE(S390_FEAT_VECTOR_ENH2, HWCAP_S390_VXRS_EXT2);
1763
1764 return hwcap;
1765 }
1766
elf_hwcap_str(uint32_t bit)1767 const char *elf_hwcap_str(uint32_t bit)
1768 {
1769 static const char *hwcap_str[] = {
1770 [HWCAP_S390_NR_ESAN3] = "esan3",
1771 [HWCAP_S390_NR_ZARCH] = "zarch",
1772 [HWCAP_S390_NR_STFLE] = "stfle",
1773 [HWCAP_S390_NR_MSA] = "msa",
1774 [HWCAP_S390_NR_LDISP] = "ldisp",
1775 [HWCAP_S390_NR_EIMM] = "eimm",
1776 [HWCAP_S390_NR_DFP] = "dfp",
1777 [HWCAP_S390_NR_HPAGE] = "edat",
1778 [HWCAP_S390_NR_ETF3EH] = "etf3eh",
1779 [HWCAP_S390_NR_HIGH_GPRS] = "highgprs",
1780 [HWCAP_S390_NR_TE] = "te",
1781 [HWCAP_S390_NR_VXRS] = "vx",
1782 [HWCAP_S390_NR_VXRS_BCD] = "vxd",
1783 [HWCAP_S390_NR_VXRS_EXT] = "vxe",
1784 [HWCAP_S390_NR_GS] = "gs",
1785 [HWCAP_S390_NR_VXRS_EXT2] = "vxe2",
1786 [HWCAP_S390_NR_VXRS_PDE] = "vxp",
1787 [HWCAP_S390_NR_SORT] = "sort",
1788 [HWCAP_S390_NR_DFLT] = "dflt",
1789 [HWCAP_S390_NR_NNPA] = "nnpa",
1790 [HWCAP_S390_NR_PCI_MIO] = "pcimio",
1791 [HWCAP_S390_NR_SIE] = "sie",
1792 };
1793
1794 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
1795 }
1796
init_thread(struct target_pt_regs * regs,struct image_info * infop)1797 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
1798 {
1799 regs->psw.addr = infop->entry;
1800 regs->psw.mask = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \
1801 PSW_MASK_MCHECK | PSW_MASK_PSTATE | PSW_MASK_64 | \
1802 PSW_MASK_32;
1803 regs->gprs[15] = infop->start_stack;
1804 }
1805
1806 /* See linux kernel: arch/s390/include/uapi/asm/ptrace.h (s390_regs). */
1807 #define ELF_NREG 27
1808 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1809
1810 enum {
1811 TARGET_REG_PSWM = 0,
1812 TARGET_REG_PSWA = 1,
1813 TARGET_REG_GPRS = 2,
1814 TARGET_REG_ARS = 18,
1815 TARGET_REG_ORIG_R2 = 26,
1816 };
1817
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUS390XState * env)1818 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1819 const CPUS390XState *env)
1820 {
1821 int i;
1822 uint32_t *aregs;
1823
1824 (*regs)[TARGET_REG_PSWM] = tswapreg(env->psw.mask);
1825 (*regs)[TARGET_REG_PSWA] = tswapreg(env->psw.addr);
1826 for (i = 0; i < 16; i++) {
1827 (*regs)[TARGET_REG_GPRS + i] = tswapreg(env->regs[i]);
1828 }
1829 aregs = (uint32_t *)&((*regs)[TARGET_REG_ARS]);
1830 for (i = 0; i < 16; i++) {
1831 aregs[i] = tswap32(env->aregs[i]);
1832 }
1833 (*regs)[TARGET_REG_ORIG_R2] = 0;
1834 }
1835
1836 #define USE_ELF_CORE_DUMP
1837 #define ELF_EXEC_PAGESIZE 4096
1838
1839 #define VDSO_HEADER "vdso.c.inc"
1840
1841 #endif /* TARGET_S390X */
1842
1843 #ifdef TARGET_RISCV
1844
1845 #define ELF_ARCH EM_RISCV
1846
1847 #ifdef TARGET_RISCV32
1848 #define ELF_CLASS ELFCLASS32
1849 #define VDSO_HEADER "vdso-32.c.inc"
1850 #else
1851 #define ELF_CLASS ELFCLASS64
1852 #define VDSO_HEADER "vdso-64.c.inc"
1853 #endif
1854
1855 #define ELF_HWCAP get_elf_hwcap()
1856
get_elf_hwcap(void)1857 static uint32_t get_elf_hwcap(void)
1858 {
1859 #define MISA_BIT(EXT) (1 << (EXT - 'A'))
1860 RISCVCPU *cpu = RISCV_CPU(thread_cpu);
1861 uint32_t mask = MISA_BIT('I') | MISA_BIT('M') | MISA_BIT('A')
1862 | MISA_BIT('F') | MISA_BIT('D') | MISA_BIT('C')
1863 | MISA_BIT('V');
1864
1865 return cpu->env.misa_ext & mask;
1866 #undef MISA_BIT
1867 }
1868
init_thread(struct target_pt_regs * regs,struct image_info * infop)1869 static inline void init_thread(struct target_pt_regs *regs,
1870 struct image_info *infop)
1871 {
1872 regs->sepc = infop->entry;
1873 regs->sp = infop->start_stack;
1874 }
1875
1876 #define ELF_EXEC_PAGESIZE 4096
1877
1878 #endif /* TARGET_RISCV */
1879
1880 #ifdef TARGET_HPPA
1881
1882 #define ELF_CLASS ELFCLASS32
1883 #define ELF_ARCH EM_PARISC
1884 #define ELF_PLATFORM "PARISC"
1885 #define STACK_GROWS_DOWN 0
1886 #define STACK_ALIGNMENT 64
1887
1888 #define VDSO_HEADER "vdso.c.inc"
1889
init_thread(struct target_pt_regs * regs,struct image_info * infop)1890 static inline void init_thread(struct target_pt_regs *regs,
1891 struct image_info *infop)
1892 {
1893 regs->iaoq[0] = infop->entry | PRIV_USER;
1894 regs->iaoq[1] = regs->iaoq[0] + 4;
1895 regs->gr[23] = 0;
1896 regs->gr[24] = infop->argv;
1897 regs->gr[25] = infop->argc;
1898 /* The top-of-stack contains a linkage buffer. */
1899 regs->gr[30] = infop->start_stack + 64;
1900 regs->gr[31] = infop->entry;
1901 }
1902
1903 #define LO_COMMPAGE 0
1904
init_guest_commpage(void)1905 static bool init_guest_commpage(void)
1906 {
1907 /* If reserved_va, then we have already mapped 0 page on the host. */
1908 if (!reserved_va) {
1909 void *want, *addr;
1910
1911 want = g2h_untagged(LO_COMMPAGE);
1912 addr = mmap(want, TARGET_PAGE_SIZE, PROT_NONE,
1913 MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED_NOREPLACE, -1, 0);
1914 if (addr == MAP_FAILED) {
1915 perror("Allocating guest commpage");
1916 exit(EXIT_FAILURE);
1917 }
1918 if (addr != want) {
1919 return false;
1920 }
1921 }
1922
1923 /*
1924 * On Linux, page zero is normally marked execute only + gateway.
1925 * Normal read or write is supposed to fail (thus PROT_NONE above),
1926 * but specific offsets have kernel code mapped to raise permissions
1927 * and implement syscalls. Here, simply mark the page executable.
1928 * Special case the entry points during translation (see do_page_zero).
1929 */
1930 page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK,
1931 PAGE_EXEC | PAGE_VALID);
1932 return true;
1933 }
1934
1935 #endif /* TARGET_HPPA */
1936
1937 #ifdef TARGET_XTENSA
1938
1939 #define ELF_CLASS ELFCLASS32
1940 #define ELF_ARCH EM_XTENSA
1941
init_thread(struct target_pt_regs * regs,struct image_info * infop)1942 static inline void init_thread(struct target_pt_regs *regs,
1943 struct image_info *infop)
1944 {
1945 regs->windowbase = 0;
1946 regs->windowstart = 1;
1947 regs->areg[1] = infop->start_stack;
1948 regs->pc = infop->entry;
1949 if (info_is_fdpic(infop)) {
1950 regs->areg[4] = infop->loadmap_addr;
1951 regs->areg[5] = infop->interpreter_loadmap_addr;
1952 if (infop->interpreter_loadmap_addr) {
1953 regs->areg[6] = infop->interpreter_pt_dynamic_addr;
1954 } else {
1955 regs->areg[6] = infop->pt_dynamic_addr;
1956 }
1957 }
1958 }
1959
1960 /* See linux kernel: arch/xtensa/include/asm/elf.h. */
1961 #define ELF_NREG 128
1962 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1963
1964 enum {
1965 TARGET_REG_PC,
1966 TARGET_REG_PS,
1967 TARGET_REG_LBEG,
1968 TARGET_REG_LEND,
1969 TARGET_REG_LCOUNT,
1970 TARGET_REG_SAR,
1971 TARGET_REG_WINDOWSTART,
1972 TARGET_REG_WINDOWBASE,
1973 TARGET_REG_THREADPTR,
1974 TARGET_REG_AR0 = 64,
1975 };
1976
elf_core_copy_regs(target_elf_gregset_t * regs,const CPUXtensaState * env)1977 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1978 const CPUXtensaState *env)
1979 {
1980 unsigned i;
1981
1982 (*regs)[TARGET_REG_PC] = tswapreg(env->pc);
1983 (*regs)[TARGET_REG_PS] = tswapreg(env->sregs[PS] & ~PS_EXCM);
1984 (*regs)[TARGET_REG_LBEG] = tswapreg(env->sregs[LBEG]);
1985 (*regs)[TARGET_REG_LEND] = tswapreg(env->sregs[LEND]);
1986 (*regs)[TARGET_REG_LCOUNT] = tswapreg(env->sregs[LCOUNT]);
1987 (*regs)[TARGET_REG_SAR] = tswapreg(env->sregs[SAR]);
1988 (*regs)[TARGET_REG_WINDOWSTART] = tswapreg(env->sregs[WINDOW_START]);
1989 (*regs)[TARGET_REG_WINDOWBASE] = tswapreg(env->sregs[WINDOW_BASE]);
1990 (*regs)[TARGET_REG_THREADPTR] = tswapreg(env->uregs[THREADPTR]);
1991 xtensa_sync_phys_from_window((CPUXtensaState *)env);
1992 for (i = 0; i < env->config->nareg; ++i) {
1993 (*regs)[TARGET_REG_AR0 + i] = tswapreg(env->phys_regs[i]);
1994 }
1995 }
1996
1997 #define USE_ELF_CORE_DUMP
1998 #define ELF_EXEC_PAGESIZE 4096
1999
2000 #endif /* TARGET_XTENSA */
2001
2002 #ifdef TARGET_HEXAGON
2003
2004 #define ELF_CLASS ELFCLASS32
2005 #define ELF_ARCH EM_HEXAGON
2006
init_thread(struct target_pt_regs * regs,struct image_info * infop)2007 static inline void init_thread(struct target_pt_regs *regs,
2008 struct image_info *infop)
2009 {
2010 regs->sepc = infop->entry;
2011 regs->sp = infop->start_stack;
2012 }
2013
2014 #endif /* TARGET_HEXAGON */
2015
2016 #ifndef ELF_BASE_PLATFORM
2017 #define ELF_BASE_PLATFORM (NULL)
2018 #endif
2019
2020 #ifndef ELF_PLATFORM
2021 #define ELF_PLATFORM (NULL)
2022 #endif
2023
2024 #ifndef ELF_MACHINE
2025 #define ELF_MACHINE ELF_ARCH
2026 #endif
2027
2028 #ifndef elf_check_arch
2029 #define elf_check_arch(x) ((x) == ELF_ARCH)
2030 #endif
2031
2032 #ifndef elf_check_abi
2033 #define elf_check_abi(x) (1)
2034 #endif
2035
2036 #ifndef ELF_HWCAP
2037 #define ELF_HWCAP 0
2038 #endif
2039
2040 #ifndef STACK_GROWS_DOWN
2041 #define STACK_GROWS_DOWN 1
2042 #endif
2043
2044 #ifndef STACK_ALIGNMENT
2045 #define STACK_ALIGNMENT 16
2046 #endif
2047
2048 #ifdef TARGET_ABI32
2049 #undef ELF_CLASS
2050 #define ELF_CLASS ELFCLASS32
2051 #undef bswaptls
2052 #define bswaptls(ptr) bswap32s(ptr)
2053 #endif
2054
2055 #ifndef EXSTACK_DEFAULT
2056 #define EXSTACK_DEFAULT false
2057 #endif
2058
2059 #include "elf.h"
2060
2061 /* We must delay the following stanzas until after "elf.h". */
2062 #if defined(TARGET_AARCH64)
2063
arch_parse_elf_property(uint32_t pr_type,uint32_t pr_datasz,const uint32_t * data,struct image_info * info,Error ** errp)2064 static bool arch_parse_elf_property(uint32_t pr_type, uint32_t pr_datasz,
2065 const uint32_t *data,
2066 struct image_info *info,
2067 Error **errp)
2068 {
2069 if (pr_type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) {
2070 if (pr_datasz != sizeof(uint32_t)) {
2071 error_setg(errp, "Ill-formed GNU_PROPERTY_AARCH64_FEATURE_1_AND");
2072 return false;
2073 }
2074 /* We will extract GNU_PROPERTY_AARCH64_FEATURE_1_BTI later. */
2075 info->note_flags = *data;
2076 }
2077 return true;
2078 }
2079 #define ARCH_USE_GNU_PROPERTY 1
2080
2081 #else
2082
arch_parse_elf_property(uint32_t pr_type,uint32_t pr_datasz,const uint32_t * data,struct image_info * info,Error ** errp)2083 static bool arch_parse_elf_property(uint32_t pr_type, uint32_t pr_datasz,
2084 const uint32_t *data,
2085 struct image_info *info,
2086 Error **errp)
2087 {
2088 g_assert_not_reached();
2089 }
2090 #define ARCH_USE_GNU_PROPERTY 0
2091
2092 #endif
2093
2094 struct exec
2095 {
2096 unsigned int a_info; /* Use macros N_MAGIC, etc for access */
2097 unsigned int a_text; /* length of text, in bytes */
2098 unsigned int a_data; /* length of data, in bytes */
2099 unsigned int a_bss; /* length of uninitialized data area, in bytes */
2100 unsigned int a_syms; /* length of symbol table data in file, in bytes */
2101 unsigned int a_entry; /* start address */
2102 unsigned int a_trsize; /* length of relocation info for text, in bytes */
2103 unsigned int a_drsize; /* length of relocation info for data, in bytes */
2104 };
2105
2106
2107 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
2108 #define OMAGIC 0407
2109 #define NMAGIC 0410
2110 #define ZMAGIC 0413
2111 #define QMAGIC 0314
2112
2113 #define DLINFO_ITEMS 16
2114
memcpy_fromfs(void * to,const void * from,unsigned long n)2115 static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
2116 {
2117 memcpy(to, from, n);
2118 }
2119
2120 #ifdef BSWAP_NEEDED
bswap_ehdr(struct elfhdr * ehdr)2121 static void bswap_ehdr(struct elfhdr *ehdr)
2122 {
2123 bswap16s(&ehdr->e_type); /* Object file type */
2124 bswap16s(&ehdr->e_machine); /* Architecture */
2125 bswap32s(&ehdr->e_version); /* Object file version */
2126 bswaptls(&ehdr->e_entry); /* Entry point virtual address */
2127 bswaptls(&ehdr->e_phoff); /* Program header table file offset */
2128 bswaptls(&ehdr->e_shoff); /* Section header table file offset */
2129 bswap32s(&ehdr->e_flags); /* Processor-specific flags */
2130 bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
2131 bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
2132 bswap16s(&ehdr->e_phnum); /* Program header table entry count */
2133 bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
2134 bswap16s(&ehdr->e_shnum); /* Section header table entry count */
2135 bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
2136 }
2137
bswap_phdr(struct elf_phdr * phdr,int phnum)2138 static void bswap_phdr(struct elf_phdr *phdr, int phnum)
2139 {
2140 int i;
2141 for (i = 0; i < phnum; ++i, ++phdr) {
2142 bswap32s(&phdr->p_type); /* Segment type */
2143 bswap32s(&phdr->p_flags); /* Segment flags */
2144 bswaptls(&phdr->p_offset); /* Segment file offset */
2145 bswaptls(&phdr->p_vaddr); /* Segment virtual address */
2146 bswaptls(&phdr->p_paddr); /* Segment physical address */
2147 bswaptls(&phdr->p_filesz); /* Segment size in file */
2148 bswaptls(&phdr->p_memsz); /* Segment size in memory */
2149 bswaptls(&phdr->p_align); /* Segment alignment */
2150 }
2151 }
2152
bswap_shdr(struct elf_shdr * shdr,int shnum)2153 static void bswap_shdr(struct elf_shdr *shdr, int shnum)
2154 {
2155 int i;
2156 for (i = 0; i < shnum; ++i, ++shdr) {
2157 bswap32s(&shdr->sh_name);
2158 bswap32s(&shdr->sh_type);
2159 bswaptls(&shdr->sh_flags);
2160 bswaptls(&shdr->sh_addr);
2161 bswaptls(&shdr->sh_offset);
2162 bswaptls(&shdr->sh_size);
2163 bswap32s(&shdr->sh_link);
2164 bswap32s(&shdr->sh_info);
2165 bswaptls(&shdr->sh_addralign);
2166 bswaptls(&shdr->sh_entsize);
2167 }
2168 }
2169
bswap_sym(struct elf_sym * sym)2170 static void bswap_sym(struct elf_sym *sym)
2171 {
2172 bswap32s(&sym->st_name);
2173 bswaptls(&sym->st_value);
2174 bswaptls(&sym->st_size);
2175 bswap16s(&sym->st_shndx);
2176 }
2177
2178 #ifdef TARGET_MIPS
bswap_mips_abiflags(Mips_elf_abiflags_v0 * abiflags)2179 static void bswap_mips_abiflags(Mips_elf_abiflags_v0 *abiflags)
2180 {
2181 bswap16s(&abiflags->version);
2182 bswap32s(&abiflags->ases);
2183 bswap32s(&abiflags->isa_ext);
2184 bswap32s(&abiflags->flags1);
2185 bswap32s(&abiflags->flags2);
2186 }
2187 #endif
2188 #else
bswap_ehdr(struct elfhdr * ehdr)2189 static inline void bswap_ehdr(struct elfhdr *ehdr) { }
bswap_phdr(struct elf_phdr * phdr,int phnum)2190 static inline void bswap_phdr(struct elf_phdr *phdr, int phnum) { }
bswap_shdr(struct elf_shdr * shdr,int shnum)2191 static inline void bswap_shdr(struct elf_shdr *shdr, int shnum) { }
bswap_sym(struct elf_sym * sym)2192 static inline void bswap_sym(struct elf_sym *sym) { }
2193 #ifdef TARGET_MIPS
bswap_mips_abiflags(Mips_elf_abiflags_v0 * abiflags)2194 static inline void bswap_mips_abiflags(Mips_elf_abiflags_v0 *abiflags) { }
2195 #endif
2196 #endif
2197
2198 #ifdef USE_ELF_CORE_DUMP
2199 static int elf_core_dump(int, const CPUArchState *);
2200 #endif /* USE_ELF_CORE_DUMP */
2201 static void load_symbols(struct elfhdr *hdr, const ImageSource *src,
2202 abi_ulong load_bias);
2203
2204 /* Verify the portions of EHDR within E_IDENT for the target.
2205 This can be performed before bswapping the entire header. */
elf_check_ident(struct elfhdr * ehdr)2206 static bool elf_check_ident(struct elfhdr *ehdr)
2207 {
2208 return (ehdr->e_ident[EI_MAG0] == ELFMAG0
2209 && ehdr->e_ident[EI_MAG1] == ELFMAG1
2210 && ehdr->e_ident[EI_MAG2] == ELFMAG2
2211 && ehdr->e_ident[EI_MAG3] == ELFMAG3
2212 && ehdr->e_ident[EI_CLASS] == ELF_CLASS
2213 && ehdr->e_ident[EI_DATA] == ELF_DATA
2214 && ehdr->e_ident[EI_VERSION] == EV_CURRENT);
2215 }
2216
2217 /* Verify the portions of EHDR outside of E_IDENT for the target.
2218 This has to wait until after bswapping the header. */
elf_check_ehdr(struct elfhdr * ehdr)2219 static bool elf_check_ehdr(struct elfhdr *ehdr)
2220 {
2221 return (elf_check_arch(ehdr->e_machine)
2222 && elf_check_abi(ehdr->e_flags)
2223 && ehdr->e_ehsize == sizeof(struct elfhdr)
2224 && ehdr->e_phentsize == sizeof(struct elf_phdr)
2225 && (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN));
2226 }
2227
2228 /*
2229 * 'copy_elf_strings()' copies argument/envelope strings from user
2230 * memory to free pages in kernel mem. These are in a format ready
2231 * to be put directly into the top of new user memory.
2232 *
2233 */
copy_elf_strings(int argc,char ** argv,char * scratch,abi_ulong p,abi_ulong stack_limit)2234 static abi_ulong copy_elf_strings(int argc, char **argv, char *scratch,
2235 abi_ulong p, abi_ulong stack_limit)
2236 {
2237 char *tmp;
2238 int len, i;
2239 abi_ulong top = p;
2240
2241 if (!p) {
2242 return 0; /* bullet-proofing */
2243 }
2244
2245 if (STACK_GROWS_DOWN) {
2246 int offset = ((p - 1) % TARGET_PAGE_SIZE) + 1;
2247 for (i = argc - 1; i >= 0; --i) {
2248 tmp = argv[i];
2249 if (!tmp) {
2250 fprintf(stderr, "VFS: argc is wrong");
2251 exit(-1);
2252 }
2253 len = strlen(tmp) + 1;
2254 tmp += len;
2255
2256 if (len > (p - stack_limit)) {
2257 return 0;
2258 }
2259 while (len) {
2260 int bytes_to_copy = (len > offset) ? offset : len;
2261 tmp -= bytes_to_copy;
2262 p -= bytes_to_copy;
2263 offset -= bytes_to_copy;
2264 len -= bytes_to_copy;
2265
2266 memcpy_fromfs(scratch + offset, tmp, bytes_to_copy);
2267
2268 if (offset == 0) {
2269 memcpy_to_target(p, scratch, top - p);
2270 top = p;
2271 offset = TARGET_PAGE_SIZE;
2272 }
2273 }
2274 }
2275 if (p != top) {
2276 memcpy_to_target(p, scratch + offset, top - p);
2277 }
2278 } else {
2279 int remaining = TARGET_PAGE_SIZE - (p % TARGET_PAGE_SIZE);
2280 for (i = 0; i < argc; ++i) {
2281 tmp = argv[i];
2282 if (!tmp) {
2283 fprintf(stderr, "VFS: argc is wrong");
2284 exit(-1);
2285 }
2286 len = strlen(tmp) + 1;
2287 if (len > (stack_limit - p)) {
2288 return 0;
2289 }
2290 while (len) {
2291 int bytes_to_copy = (len > remaining) ? remaining : len;
2292
2293 memcpy_fromfs(scratch + (p - top), tmp, bytes_to_copy);
2294
2295 tmp += bytes_to_copy;
2296 remaining -= bytes_to_copy;
2297 p += bytes_to_copy;
2298 len -= bytes_to_copy;
2299
2300 if (remaining == 0) {
2301 memcpy_to_target(top, scratch, p - top);
2302 top = p;
2303 remaining = TARGET_PAGE_SIZE;
2304 }
2305 }
2306 }
2307 if (p != top) {
2308 memcpy_to_target(top, scratch, p - top);
2309 }
2310 }
2311
2312 return p;
2313 }
2314
2315 /* Older linux kernels provide up to MAX_ARG_PAGES (default: 32) of
2316 * argument/environment space. Newer kernels (>2.6.33) allow more,
2317 * dependent on stack size, but guarantee at least 32 pages for
2318 * backwards compatibility.
2319 */
2320 #define STACK_LOWER_LIMIT (32 * TARGET_PAGE_SIZE)
2321
setup_arg_pages(struct linux_binprm * bprm,struct image_info * info)2322 static abi_ulong setup_arg_pages(struct linux_binprm *bprm,
2323 struct image_info *info)
2324 {
2325 abi_ulong size, error, guard;
2326 int prot;
2327
2328 size = guest_stack_size;
2329 if (size < STACK_LOWER_LIMIT) {
2330 size = STACK_LOWER_LIMIT;
2331 }
2332
2333 if (STACK_GROWS_DOWN) {
2334 guard = TARGET_PAGE_SIZE;
2335 if (guard < qemu_real_host_page_size()) {
2336 guard = qemu_real_host_page_size();
2337 }
2338 } else {
2339 /* no guard page for hppa target where stack grows upwards. */
2340 guard = 0;
2341 }
2342
2343 prot = PROT_READ | PROT_WRITE;
2344 if (info->exec_stack) {
2345 prot |= PROT_EXEC;
2346 }
2347 error = target_mmap(0, size + guard, prot,
2348 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
2349 if (error == -1) {
2350 perror("mmap stack");
2351 exit(-1);
2352 }
2353
2354 /* We reserve one extra page at the top of the stack as guard. */
2355 if (STACK_GROWS_DOWN) {
2356 target_mprotect(error, guard, PROT_NONE);
2357 info->stack_limit = error + guard;
2358 return info->stack_limit + size - sizeof(void *);
2359 } else {
2360 info->stack_limit = error + size;
2361 return error;
2362 }
2363 }
2364
2365 /**
2366 * zero_bss:
2367 *
2368 * Map and zero the bss. We need to explicitly zero any fractional pages
2369 * after the data section (i.e. bss). Return false on mapping failure.
2370 */
zero_bss(abi_ulong start_bss,abi_ulong end_bss,int prot,Error ** errp)2371 static bool zero_bss(abi_ulong start_bss, abi_ulong end_bss,
2372 int prot, Error **errp)
2373 {
2374 abi_ulong align_bss;
2375
2376 /* We only expect writable bss; the code segment shouldn't need this. */
2377 if (!(prot & PROT_WRITE)) {
2378 error_setg(errp, "PT_LOAD with non-writable bss");
2379 return false;
2380 }
2381
2382 align_bss = TARGET_PAGE_ALIGN(start_bss);
2383 end_bss = TARGET_PAGE_ALIGN(end_bss);
2384
2385 if (start_bss < align_bss) {
2386 int flags = page_get_flags(start_bss);
2387
2388 if (!(flags & PAGE_RWX)) {
2389 /*
2390 * The whole address space of the executable was reserved
2391 * at the start, therefore all pages will be VALID.
2392 * But assuming there are no PROT_NONE PT_LOAD segments,
2393 * a PROT_NONE page means no data all bss, and we can
2394 * simply extend the new anon mapping back to the start
2395 * of the page of bss.
2396 */
2397 align_bss -= TARGET_PAGE_SIZE;
2398 } else {
2399 /*
2400 * The start of the bss shares a page with something.
2401 * The only thing that we expect is the data section,
2402 * which would already be marked writable.
2403 * Overlapping the RX code segment seems malformed.
2404 */
2405 if (!(flags & PAGE_WRITE)) {
2406 error_setg(errp, "PT_LOAD with bss overlapping "
2407 "non-writable page");
2408 return false;
2409 }
2410
2411 /* The page is already mapped and writable. */
2412 memset(g2h_untagged(start_bss), 0, align_bss - start_bss);
2413 }
2414 }
2415
2416 if (align_bss < end_bss &&
2417 target_mmap(align_bss, end_bss - align_bss, prot,
2418 MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == -1) {
2419 error_setg_errno(errp, errno, "Error mapping bss");
2420 return false;
2421 }
2422 return true;
2423 }
2424
2425 #if defined(TARGET_ARM)
elf_is_fdpic(struct elfhdr * exec)2426 static int elf_is_fdpic(struct elfhdr *exec)
2427 {
2428 return exec->e_ident[EI_OSABI] == ELFOSABI_ARM_FDPIC;
2429 }
2430 #elif defined(TARGET_XTENSA)
elf_is_fdpic(struct elfhdr * exec)2431 static int elf_is_fdpic(struct elfhdr *exec)
2432 {
2433 return exec->e_ident[EI_OSABI] == ELFOSABI_XTENSA_FDPIC;
2434 }
2435 #else
2436 /* Default implementation, always false. */
elf_is_fdpic(struct elfhdr * exec)2437 static int elf_is_fdpic(struct elfhdr *exec)
2438 {
2439 return 0;
2440 }
2441 #endif
2442
loader_build_fdpic_loadmap(struct image_info * info,abi_ulong sp)2443 static abi_ulong loader_build_fdpic_loadmap(struct image_info *info, abi_ulong sp)
2444 {
2445 uint16_t n;
2446 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs;
2447
2448 /* elf32_fdpic_loadseg */
2449 n = info->nsegs;
2450 while (n--) {
2451 sp -= 12;
2452 put_user_u32(loadsegs[n].addr, sp+0);
2453 put_user_u32(loadsegs[n].p_vaddr, sp+4);
2454 put_user_u32(loadsegs[n].p_memsz, sp+8);
2455 }
2456
2457 /* elf32_fdpic_loadmap */
2458 sp -= 4;
2459 put_user_u16(0, sp+0); /* version */
2460 put_user_u16(info->nsegs, sp+2); /* nsegs */
2461
2462 info->personality = PER_LINUX_FDPIC;
2463 info->loadmap_addr = sp;
2464
2465 return sp;
2466 }
2467
create_elf_tables(abi_ulong p,int argc,int envc,struct elfhdr * exec,struct image_info * info,struct image_info * interp_info,struct image_info * vdso_info)2468 static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
2469 struct elfhdr *exec,
2470 struct image_info *info,
2471 struct image_info *interp_info,
2472 struct image_info *vdso_info)
2473 {
2474 abi_ulong sp;
2475 abi_ulong u_argc, u_argv, u_envp, u_auxv;
2476 int size;
2477 int i;
2478 abi_ulong u_rand_bytes;
2479 uint8_t k_rand_bytes[16];
2480 abi_ulong u_platform, u_base_platform;
2481 const char *k_platform, *k_base_platform;
2482 const int n = sizeof(elf_addr_t);
2483
2484 sp = p;
2485
2486 /* Needs to be before we load the env/argc/... */
2487 if (elf_is_fdpic(exec)) {
2488 /* Need 4 byte alignment for these structs */
2489 sp &= ~3;
2490 sp = loader_build_fdpic_loadmap(info, sp);
2491 info->other_info = interp_info;
2492 if (interp_info) {
2493 interp_info->other_info = info;
2494 sp = loader_build_fdpic_loadmap(interp_info, sp);
2495 info->interpreter_loadmap_addr = interp_info->loadmap_addr;
2496 info->interpreter_pt_dynamic_addr = interp_info->pt_dynamic_addr;
2497 } else {
2498 info->interpreter_loadmap_addr = 0;
2499 info->interpreter_pt_dynamic_addr = 0;
2500 }
2501 }
2502
2503 u_base_platform = 0;
2504 k_base_platform = ELF_BASE_PLATFORM;
2505 if (k_base_platform) {
2506 size_t len = strlen(k_base_platform) + 1;
2507 if (STACK_GROWS_DOWN) {
2508 sp -= (len + n - 1) & ~(n - 1);
2509 u_base_platform = sp;
2510 /* FIXME - check return value of memcpy_to_target() for failure */
2511 memcpy_to_target(sp, k_base_platform, len);
2512 } else {
2513 memcpy_to_target(sp, k_base_platform, len);
2514 u_base_platform = sp;
2515 sp += len + 1;
2516 }
2517 }
2518
2519 u_platform = 0;
2520 k_platform = ELF_PLATFORM;
2521 if (k_platform) {
2522 size_t len = strlen(k_platform) + 1;
2523 if (STACK_GROWS_DOWN) {
2524 sp -= (len + n - 1) & ~(n - 1);
2525 u_platform = sp;
2526 /* FIXME - check return value of memcpy_to_target() for failure */
2527 memcpy_to_target(sp, k_platform, len);
2528 } else {
2529 memcpy_to_target(sp, k_platform, len);
2530 u_platform = sp;
2531 sp += len + 1;
2532 }
2533 }
2534
2535 /* Provide 16 byte alignment for the PRNG, and basic alignment for
2536 * the argv and envp pointers.
2537 */
2538 if (STACK_GROWS_DOWN) {
2539 sp = QEMU_ALIGN_DOWN(sp, 16);
2540 } else {
2541 sp = QEMU_ALIGN_UP(sp, 16);
2542 }
2543
2544 /*
2545 * Generate 16 random bytes for userspace PRNG seeding.
2546 */
2547 qemu_guest_getrandom_nofail(k_rand_bytes, sizeof(k_rand_bytes));
2548 if (STACK_GROWS_DOWN) {
2549 sp -= 16;
2550 u_rand_bytes = sp;
2551 /* FIXME - check return value of memcpy_to_target() for failure */
2552 memcpy_to_target(sp, k_rand_bytes, 16);
2553 } else {
2554 memcpy_to_target(sp, k_rand_bytes, 16);
2555 u_rand_bytes = sp;
2556 sp += 16;
2557 }
2558
2559 size = (DLINFO_ITEMS + 1) * 2;
2560 if (k_base_platform) {
2561 size += 2;
2562 }
2563 if (k_platform) {
2564 size += 2;
2565 }
2566 if (vdso_info) {
2567 size += 2;
2568 }
2569 #ifdef DLINFO_ARCH_ITEMS
2570 size += DLINFO_ARCH_ITEMS * 2;
2571 #endif
2572 #ifdef ELF_HWCAP2
2573 size += 2;
2574 #endif
2575 info->auxv_len = size * n;
2576
2577 size += envc + argc + 2;
2578 size += 1; /* argc itself */
2579 size *= n;
2580
2581 /* Allocate space and finalize stack alignment for entry now. */
2582 if (STACK_GROWS_DOWN) {
2583 u_argc = QEMU_ALIGN_DOWN(sp - size, STACK_ALIGNMENT);
2584 sp = u_argc;
2585 } else {
2586 u_argc = sp;
2587 sp = QEMU_ALIGN_UP(sp + size, STACK_ALIGNMENT);
2588 }
2589
2590 u_argv = u_argc + n;
2591 u_envp = u_argv + (argc + 1) * n;
2592 u_auxv = u_envp + (envc + 1) * n;
2593 info->saved_auxv = u_auxv;
2594 info->argc = argc;
2595 info->envc = envc;
2596 info->argv = u_argv;
2597 info->envp = u_envp;
2598
2599 /* This is correct because Linux defines
2600 * elf_addr_t as Elf32_Off / Elf64_Off
2601 */
2602 #define NEW_AUX_ENT(id, val) do { \
2603 put_user_ual(id, u_auxv); u_auxv += n; \
2604 put_user_ual(val, u_auxv); u_auxv += n; \
2605 } while(0)
2606
2607 #ifdef ARCH_DLINFO
2608 /*
2609 * ARCH_DLINFO must come first so platform specific code can enforce
2610 * special alignment requirements on the AUXV if necessary (eg. PPC).
2611 */
2612 ARCH_DLINFO;
2613 #endif
2614 /* There must be exactly DLINFO_ITEMS entries here, or the assert
2615 * on info->auxv_len will trigger.
2616 */
2617 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff));
2618 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
2619 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
2620 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
2621 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_info ? interp_info->load_addr : 0));
2622 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
2623 NEW_AUX_ENT(AT_ENTRY, info->entry);
2624 NEW_AUX_ENT(AT_UID, (abi_ulong) getuid());
2625 NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid());
2626 NEW_AUX_ENT(AT_GID, (abi_ulong) getgid());
2627 NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid());
2628 NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP);
2629 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK));
2630 NEW_AUX_ENT(AT_RANDOM, (abi_ulong) u_rand_bytes);
2631 NEW_AUX_ENT(AT_SECURE, (abi_ulong) qemu_getauxval(AT_SECURE));
2632 NEW_AUX_ENT(AT_EXECFN, info->file_string);
2633
2634 #ifdef ELF_HWCAP2
2635 NEW_AUX_ENT(AT_HWCAP2, (abi_ulong) ELF_HWCAP2);
2636 #endif
2637
2638 if (u_base_platform) {
2639 NEW_AUX_ENT(AT_BASE_PLATFORM, u_base_platform);
2640 }
2641 if (u_platform) {
2642 NEW_AUX_ENT(AT_PLATFORM, u_platform);
2643 }
2644 if (vdso_info) {
2645 NEW_AUX_ENT(AT_SYSINFO_EHDR, vdso_info->load_addr);
2646 }
2647 NEW_AUX_ENT (AT_NULL, 0);
2648 #undef NEW_AUX_ENT
2649
2650 /* Check that our initial calculation of the auxv length matches how much
2651 * we actually put into it.
2652 */
2653 assert(info->auxv_len == u_auxv - info->saved_auxv);
2654
2655 put_user_ual(argc, u_argc);
2656
2657 p = info->arg_strings;
2658 for (i = 0; i < argc; ++i) {
2659 put_user_ual(p, u_argv);
2660 u_argv += n;
2661 p += target_strlen(p) + 1;
2662 }
2663 put_user_ual(0, u_argv);
2664
2665 p = info->env_strings;
2666 for (i = 0; i < envc; ++i) {
2667 put_user_ual(p, u_envp);
2668 u_envp += n;
2669 p += target_strlen(p) + 1;
2670 }
2671 put_user_ual(0, u_envp);
2672
2673 return sp;
2674 }
2675
2676 #if defined(HI_COMMPAGE)
2677 #define LO_COMMPAGE -1
2678 #elif defined(LO_COMMPAGE)
2679 #define HI_COMMPAGE 0
2680 #else
2681 #define HI_COMMPAGE 0
2682 #define LO_COMMPAGE -1
2683 #ifndef INIT_GUEST_COMMPAGE
2684 #define init_guest_commpage() true
2685 #endif
2686 #endif
2687
2688 /**
2689 * pgb_try_mmap:
2690 * @addr: host start address
2691 * @addr_last: host last address
2692 * @keep: do not unmap the probe region
2693 *
2694 * Return 1 if [@addr, @addr_last] is not mapped in the host,
2695 * return 0 if it is not available to map, and -1 on mmap error.
2696 * If @keep, the region is left mapped on success, otherwise unmapped.
2697 */
pgb_try_mmap(uintptr_t addr,uintptr_t addr_last,bool keep)2698 static int pgb_try_mmap(uintptr_t addr, uintptr_t addr_last, bool keep)
2699 {
2700 size_t size = addr_last - addr + 1;
2701 void *p = mmap((void *)addr, size, PROT_NONE,
2702 MAP_ANONYMOUS | MAP_PRIVATE |
2703 MAP_NORESERVE | MAP_FIXED_NOREPLACE, -1, 0);
2704 int ret;
2705
2706 if (p == MAP_FAILED) {
2707 return errno == EEXIST ? 0 : -1;
2708 }
2709 ret = p == (void *)addr;
2710 if (!keep || !ret) {
2711 munmap(p, size);
2712 }
2713 return ret;
2714 }
2715
2716 /**
2717 * pgb_try_mmap_skip_brk(uintptr_t addr, uintptr_t size, uintptr_t brk)
2718 * @addr: host address
2719 * @addr_last: host last address
2720 * @brk: host brk
2721 *
2722 * Like pgb_try_mmap, but additionally reserve some memory following brk.
2723 */
pgb_try_mmap_skip_brk(uintptr_t addr,uintptr_t addr_last,uintptr_t brk,bool keep)2724 static int pgb_try_mmap_skip_brk(uintptr_t addr, uintptr_t addr_last,
2725 uintptr_t brk, bool keep)
2726 {
2727 uintptr_t brk_last = brk + 16 * MiB - 1;
2728
2729 /* Do not map anything close to the host brk. */
2730 if (addr <= brk_last && brk <= addr_last) {
2731 return 0;
2732 }
2733 return pgb_try_mmap(addr, addr_last, keep);
2734 }
2735
2736 /**
2737 * pgb_try_mmap_set:
2738 * @ga: set of guest addrs
2739 * @base: guest_base
2740 * @brk: host brk
2741 *
2742 * Return true if all @ga can be mapped by the host at @base.
2743 * On success, retain the mapping at index 0 for reserved_va.
2744 */
2745
2746 typedef struct PGBAddrs {
2747 uintptr_t bounds[3][2]; /* start/last pairs */
2748 int nbounds;
2749 } PGBAddrs;
2750
pgb_try_mmap_set(const PGBAddrs * ga,uintptr_t base,uintptr_t brk)2751 static bool pgb_try_mmap_set(const PGBAddrs *ga, uintptr_t base, uintptr_t brk)
2752 {
2753 for (int i = ga->nbounds - 1; i >= 0; --i) {
2754 if (pgb_try_mmap_skip_brk(ga->bounds[i][0] + base,
2755 ga->bounds[i][1] + base,
2756 brk, i == 0 && reserved_va) <= 0) {
2757 return false;
2758 }
2759 }
2760 return true;
2761 }
2762
2763 /**
2764 * pgb_addr_set:
2765 * @ga: output set of guest addrs
2766 * @guest_loaddr: guest image low address
2767 * @guest_loaddr: guest image high address
2768 * @identity: create for identity mapping
2769 *
2770 * Fill in @ga with the image, COMMPAGE and NULL page.
2771 */
pgb_addr_set(PGBAddrs * ga,abi_ulong guest_loaddr,abi_ulong guest_hiaddr,bool try_identity)2772 static bool pgb_addr_set(PGBAddrs *ga, abi_ulong guest_loaddr,
2773 abi_ulong guest_hiaddr, bool try_identity)
2774 {
2775 int n;
2776
2777 /*
2778 * With a low commpage, or a guest mapped very low,
2779 * we may not be able to use the identity map.
2780 */
2781 if (try_identity) {
2782 if (LO_COMMPAGE != -1 && LO_COMMPAGE < mmap_min_addr) {
2783 return false;
2784 }
2785 if (guest_loaddr != 0 && guest_loaddr < mmap_min_addr) {
2786 return false;
2787 }
2788 }
2789
2790 memset(ga, 0, sizeof(*ga));
2791 n = 0;
2792
2793 if (reserved_va) {
2794 ga->bounds[n][0] = try_identity ? mmap_min_addr : 0;
2795 ga->bounds[n][1] = reserved_va;
2796 n++;
2797 /* LO_COMMPAGE and NULL handled by reserving from 0. */
2798 } else {
2799 /* Add any LO_COMMPAGE or NULL page. */
2800 if (LO_COMMPAGE != -1) {
2801 ga->bounds[n][0] = 0;
2802 ga->bounds[n][1] = LO_COMMPAGE + TARGET_PAGE_SIZE - 1;
2803 n++;
2804 } else if (!try_identity) {
2805 ga->bounds[n][0] = 0;
2806 ga->bounds[n][1] = TARGET_PAGE_SIZE - 1;
2807 n++;
2808 }
2809
2810 /* Add the guest image for ET_EXEC. */
2811 if (guest_loaddr) {
2812 ga->bounds[n][0] = guest_loaddr;
2813 ga->bounds[n][1] = guest_hiaddr;
2814 n++;
2815 }
2816 }
2817
2818 /*
2819 * Temporarily disable
2820 * "comparison is always false due to limited range of data type"
2821 * due to comparison between unsigned and (possible) 0.
2822 */
2823 #pragma GCC diagnostic push
2824 #pragma GCC diagnostic ignored "-Wtype-limits"
2825
2826 /* Add any HI_COMMPAGE not covered by reserved_va. */
2827 if (reserved_va < HI_COMMPAGE) {
2828 ga->bounds[n][0] = HI_COMMPAGE & qemu_real_host_page_mask();
2829 ga->bounds[n][1] = HI_COMMPAGE + TARGET_PAGE_SIZE - 1;
2830 n++;
2831 }
2832
2833 #pragma GCC diagnostic pop
2834
2835 ga->nbounds = n;
2836 return true;
2837 }
2838
pgb_fail_in_use(const char * image_name)2839 static void pgb_fail_in_use(const char *image_name)
2840 {
2841 error_report("%s: requires virtual address space that is in use "
2842 "(omit the -B option or choose a different value)",
2843 image_name);
2844 exit(EXIT_FAILURE);
2845 }
2846
pgb_fixed(const char * image_name,uintptr_t guest_loaddr,uintptr_t guest_hiaddr,uintptr_t align)2847 static void pgb_fixed(const char *image_name, uintptr_t guest_loaddr,
2848 uintptr_t guest_hiaddr, uintptr_t align)
2849 {
2850 PGBAddrs ga;
2851 uintptr_t brk = (uintptr_t)sbrk(0);
2852
2853 if (!QEMU_IS_ALIGNED(guest_base, align)) {
2854 fprintf(stderr, "Requested guest base %p does not satisfy "
2855 "host minimum alignment (0x%" PRIxPTR ")\n",
2856 (void *)guest_base, align);
2857 exit(EXIT_FAILURE);
2858 }
2859
2860 if (!pgb_addr_set(&ga, guest_loaddr, guest_hiaddr, !guest_base)
2861 || !pgb_try_mmap_set(&ga, guest_base, brk)) {
2862 pgb_fail_in_use(image_name);
2863 }
2864 }
2865
2866 /**
2867 * pgb_find_fallback:
2868 *
2869 * This is a fallback method for finding holes in the host address space
2870 * if we don't have the benefit of being able to access /proc/self/map.
2871 * It can potentially take a very long time as we can only dumbly iterate
2872 * up the host address space seeing if the allocation would work.
2873 */
pgb_find_fallback(const PGBAddrs * ga,uintptr_t align,uintptr_t brk)2874 static uintptr_t pgb_find_fallback(const PGBAddrs *ga, uintptr_t align,
2875 uintptr_t brk)
2876 {
2877 /* TODO: come up with a better estimate of how much to skip. */
2878 uintptr_t skip = sizeof(uintptr_t) == 4 ? MiB : GiB;
2879
2880 for (uintptr_t base = skip; ; base += skip) {
2881 base = ROUND_UP(base, align);
2882 if (pgb_try_mmap_set(ga, base, brk)) {
2883 return base;
2884 }
2885 if (base >= -skip) {
2886 return -1;
2887 }
2888 }
2889 }
2890
pgb_try_itree(const PGBAddrs * ga,uintptr_t base,IntervalTreeRoot * root)2891 static uintptr_t pgb_try_itree(const PGBAddrs *ga, uintptr_t base,
2892 IntervalTreeRoot *root)
2893 {
2894 for (int i = ga->nbounds - 1; i >= 0; --i) {
2895 uintptr_t s = base + ga->bounds[i][0];
2896 uintptr_t l = base + ga->bounds[i][1];
2897 IntervalTreeNode *n;
2898
2899 if (l < s) {
2900 /* Wraparound. Skip to advance S to mmap_min_addr. */
2901 return mmap_min_addr - s;
2902 }
2903
2904 n = interval_tree_iter_first(root, s, l);
2905 if (n != NULL) {
2906 /* Conflict. Skip to advance S to LAST + 1. */
2907 return n->last - s + 1;
2908 }
2909 }
2910 return 0; /* success */
2911 }
2912
pgb_find_itree(const PGBAddrs * ga,IntervalTreeRoot * root,uintptr_t align,uintptr_t brk)2913 static uintptr_t pgb_find_itree(const PGBAddrs *ga, IntervalTreeRoot *root,
2914 uintptr_t align, uintptr_t brk)
2915 {
2916 uintptr_t last = mmap_min_addr;
2917 uintptr_t base, skip;
2918
2919 while (true) {
2920 base = ROUND_UP(last, align);
2921 if (base < last) {
2922 return -1;
2923 }
2924
2925 skip = pgb_try_itree(ga, base, root);
2926 if (skip == 0) {
2927 break;
2928 }
2929
2930 last = base + skip;
2931 if (last < base) {
2932 return -1;
2933 }
2934 }
2935
2936 /*
2937 * We've chosen 'base' based on holes in the interval tree,
2938 * but we don't yet know if it is a valid host address.
2939 * Because it is the first matching hole, if the host addresses
2940 * are invalid we know there are no further matches.
2941 */
2942 return pgb_try_mmap_set(ga, base, brk) ? base : -1;
2943 }
2944
pgb_dynamic(const char * image_name,uintptr_t guest_loaddr,uintptr_t guest_hiaddr,uintptr_t align)2945 static void pgb_dynamic(const char *image_name, uintptr_t guest_loaddr,
2946 uintptr_t guest_hiaddr, uintptr_t align)
2947 {
2948 IntervalTreeRoot *root;
2949 uintptr_t brk, ret;
2950 PGBAddrs ga;
2951
2952 /* Try the identity map first. */
2953 if (pgb_addr_set(&ga, guest_loaddr, guest_hiaddr, true)) {
2954 brk = (uintptr_t)sbrk(0);
2955 if (pgb_try_mmap_set(&ga, 0, brk)) {
2956 guest_base = 0;
2957 return;
2958 }
2959 }
2960
2961 /*
2962 * Rebuild the address set for non-identity map.
2963 * This differs in the mapping of the guest NULL page.
2964 */
2965 pgb_addr_set(&ga, guest_loaddr, guest_hiaddr, false);
2966
2967 root = read_self_maps();
2968
2969 /* Read brk after we've read the maps, which will malloc. */
2970 brk = (uintptr_t)sbrk(0);
2971
2972 if (!root) {
2973 ret = pgb_find_fallback(&ga, align, brk);
2974 } else {
2975 /*
2976 * Reserve the area close to the host brk.
2977 * This will be freed with the rest of the tree.
2978 */
2979 IntervalTreeNode *b = g_new0(IntervalTreeNode, 1);
2980 b->start = brk;
2981 b->last = brk + 16 * MiB - 1;
2982 interval_tree_insert(b, root);
2983
2984 ret = pgb_find_itree(&ga, root, align, brk);
2985 free_self_maps(root);
2986 }
2987
2988 if (ret == -1) {
2989 int w = TARGET_LONG_BITS / 4;
2990
2991 error_report("%s: Unable to find a guest_base to satisfy all "
2992 "guest address mapping requirements", image_name);
2993
2994 for (int i = 0; i < ga.nbounds; ++i) {
2995 error_printf(" %0*" PRIx64 "-%0*" PRIx64 "\n",
2996 w, (uint64_t)ga.bounds[i][0],
2997 w, (uint64_t)ga.bounds[i][1]);
2998 }
2999 exit(EXIT_FAILURE);
3000 }
3001 guest_base = ret;
3002 }
3003
probe_guest_base(const char * image_name,abi_ulong guest_loaddr,abi_ulong guest_hiaddr)3004 void probe_guest_base(const char *image_name, abi_ulong guest_loaddr,
3005 abi_ulong guest_hiaddr)
3006 {
3007 /* In order to use host shmat, we must be able to honor SHMLBA. */
3008 uintptr_t align = MAX(SHMLBA, TARGET_PAGE_SIZE);
3009
3010 /* Sanity check the guest binary. */
3011 if (reserved_va) {
3012 if (guest_hiaddr > reserved_va) {
3013 error_report("%s: requires more than reserved virtual "
3014 "address space (0x%" PRIx64 " > 0x%lx)",
3015 image_name, (uint64_t)guest_hiaddr, reserved_va);
3016 exit(EXIT_FAILURE);
3017 }
3018 } else {
3019 if (guest_hiaddr != (uintptr_t)guest_hiaddr) {
3020 error_report("%s: requires more virtual address space "
3021 "than the host can provide (0x%" PRIx64 ")",
3022 image_name, (uint64_t)guest_hiaddr + 1);
3023 exit(EXIT_FAILURE);
3024 }
3025 }
3026
3027 if (have_guest_base) {
3028 pgb_fixed(image_name, guest_loaddr, guest_hiaddr, align);
3029 } else {
3030 pgb_dynamic(image_name, guest_loaddr, guest_hiaddr, align);
3031 }
3032
3033 /* Reserve and initialize the commpage. */
3034 if (!init_guest_commpage()) {
3035 /* We have already probed for the commpage being free. */
3036 g_assert_not_reached();
3037 }
3038
3039 assert(QEMU_IS_ALIGNED(guest_base, align));
3040 qemu_log_mask(CPU_LOG_PAGE, "Locating guest address space "
3041 "@ 0x%" PRIx64 "\n", (uint64_t)guest_base);
3042 }
3043
3044 enum {
3045 /* The string "GNU\0" as a magic number. */
3046 GNU0_MAGIC = const_le32('G' | 'N' << 8 | 'U' << 16),
3047 NOTE_DATA_SZ = 1 * KiB,
3048 NOTE_NAME_SZ = 4,
3049 ELF_GNU_PROPERTY_ALIGN = ELF_CLASS == ELFCLASS32 ? 4 : 8,
3050 };
3051
3052 /*
3053 * Process a single gnu_property entry.
3054 * Return false for error.
3055 */
parse_elf_property(const uint32_t * data,int * off,int datasz,struct image_info * info,bool have_prev_type,uint32_t * prev_type,Error ** errp)3056 static bool parse_elf_property(const uint32_t *data, int *off, int datasz,
3057 struct image_info *info, bool have_prev_type,
3058 uint32_t *prev_type, Error **errp)
3059 {
3060 uint32_t pr_type, pr_datasz, step;
3061
3062 if (*off > datasz || !QEMU_IS_ALIGNED(*off, ELF_GNU_PROPERTY_ALIGN)) {
3063 goto error_data;
3064 }
3065 datasz -= *off;
3066 data += *off / sizeof(uint32_t);
3067
3068 if (datasz < 2 * sizeof(uint32_t)) {
3069 goto error_data;
3070 }
3071 pr_type = data[0];
3072 pr_datasz = data[1];
3073 data += 2;
3074 datasz -= 2 * sizeof(uint32_t);
3075 step = ROUND_UP(pr_datasz, ELF_GNU_PROPERTY_ALIGN);
3076 if (step > datasz) {
3077 goto error_data;
3078 }
3079
3080 /* Properties are supposed to be unique and sorted on pr_type. */
3081 if (have_prev_type && pr_type <= *prev_type) {
3082 if (pr_type == *prev_type) {
3083 error_setg(errp, "Duplicate property in PT_GNU_PROPERTY");
3084 } else {
3085 error_setg(errp, "Unsorted property in PT_GNU_PROPERTY");
3086 }
3087 return false;
3088 }
3089 *prev_type = pr_type;
3090
3091 if (!arch_parse_elf_property(pr_type, pr_datasz, data, info, errp)) {
3092 return false;
3093 }
3094
3095 *off += 2 * sizeof(uint32_t) + step;
3096 return true;
3097
3098 error_data:
3099 error_setg(errp, "Ill-formed property in PT_GNU_PROPERTY");
3100 return false;
3101 }
3102
3103 /* Process NT_GNU_PROPERTY_TYPE_0. */
parse_elf_properties(const ImageSource * src,struct image_info * info,const struct elf_phdr * phdr,Error ** errp)3104 static bool parse_elf_properties(const ImageSource *src,
3105 struct image_info *info,
3106 const struct elf_phdr *phdr,
3107 Error **errp)
3108 {
3109 union {
3110 struct elf_note nhdr;
3111 uint32_t data[NOTE_DATA_SZ / sizeof(uint32_t)];
3112 } note;
3113
3114 int n, off, datasz;
3115 bool have_prev_type;
3116 uint32_t prev_type;
3117
3118 /* Unless the arch requires properties, ignore them. */
3119 if (!ARCH_USE_GNU_PROPERTY) {
3120 return true;
3121 }
3122
3123 /* If the properties are crazy large, that's too bad. */
3124 n = phdr->p_filesz;
3125 if (n > sizeof(note)) {
3126 error_setg(errp, "PT_GNU_PROPERTY too large");
3127 return false;
3128 }
3129 if (n < sizeof(note.nhdr)) {
3130 error_setg(errp, "PT_GNU_PROPERTY too small");
3131 return false;
3132 }
3133
3134 if (!imgsrc_read(¬e, phdr->p_offset, n, src, errp)) {
3135 return false;
3136 }
3137
3138 /*
3139 * The contents of a valid PT_GNU_PROPERTY is a sequence
3140 * of uint32_t -- swap them all now.
3141 */
3142 #ifdef BSWAP_NEEDED
3143 for (int i = 0; i < n / 4; i++) {
3144 bswap32s(note.data + i);
3145 }
3146 #endif
3147
3148 /*
3149 * Note that nhdr is 3 words, and that the "name" described by namesz
3150 * immediately follows nhdr and is thus at the 4th word. Further, all
3151 * of the inputs to the kernel's round_up are multiples of 4.
3152 */
3153 if (note.nhdr.n_type != NT_GNU_PROPERTY_TYPE_0 ||
3154 note.nhdr.n_namesz != NOTE_NAME_SZ ||
3155 note.data[3] != GNU0_MAGIC) {
3156 error_setg(errp, "Invalid note in PT_GNU_PROPERTY");
3157 return false;
3158 }
3159 off = sizeof(note.nhdr) + NOTE_NAME_SZ;
3160
3161 datasz = note.nhdr.n_descsz + off;
3162 if (datasz > n) {
3163 error_setg(errp, "Invalid note size in PT_GNU_PROPERTY");
3164 return false;
3165 }
3166
3167 have_prev_type = false;
3168 prev_type = 0;
3169 while (1) {
3170 if (off == datasz) {
3171 return true; /* end, exit ok */
3172 }
3173 if (!parse_elf_property(note.data, &off, datasz, info,
3174 have_prev_type, &prev_type, errp)) {
3175 return false;
3176 }
3177 have_prev_type = true;
3178 }
3179 }
3180
3181 /**
3182 * load_elf_image: Load an ELF image into the address space.
3183 * @image_name: the filename of the image, to use in error messages.
3184 * @src: the ImageSource from which to read.
3185 * @info: info collected from the loaded image.
3186 * @ehdr: the ELF header, not yet bswapped.
3187 * @pinterp_name: record any PT_INTERP string found.
3188 *
3189 * On return: @info values will be filled in, as necessary or available.
3190 */
3191
load_elf_image(const char * image_name,const ImageSource * src,struct image_info * info,struct elfhdr * ehdr,char ** pinterp_name)3192 static void load_elf_image(const char *image_name, const ImageSource *src,
3193 struct image_info *info, struct elfhdr *ehdr,
3194 char **pinterp_name)
3195 {
3196 g_autofree struct elf_phdr *phdr = NULL;
3197 abi_ulong load_addr, load_bias, loaddr, hiaddr, error;
3198 int i, prot_exec;
3199 Error *err = NULL;
3200
3201 /*
3202 * First of all, some simple consistency checks.
3203 * Note that we rely on the bswapped ehdr staying in bprm_buf,
3204 * for later use by load_elf_binary and create_elf_tables.
3205 */
3206 if (!imgsrc_read(ehdr, 0, sizeof(*ehdr), src, &err)) {
3207 goto exit_errmsg;
3208 }
3209 if (!elf_check_ident(ehdr)) {
3210 error_setg(&err, "Invalid ELF image for this architecture");
3211 goto exit_errmsg;
3212 }
3213 bswap_ehdr(ehdr);
3214 if (!elf_check_ehdr(ehdr)) {
3215 error_setg(&err, "Invalid ELF image for this architecture");
3216 goto exit_errmsg;
3217 }
3218
3219 phdr = imgsrc_read_alloc(ehdr->e_phoff,
3220 ehdr->e_phnum * sizeof(struct elf_phdr),
3221 src, &err);
3222 if (phdr == NULL) {
3223 goto exit_errmsg;
3224 }
3225 bswap_phdr(phdr, ehdr->e_phnum);
3226
3227 info->nsegs = 0;
3228 info->pt_dynamic_addr = 0;
3229
3230 mmap_lock();
3231
3232 /*
3233 * Find the maximum size of the image and allocate an appropriate
3234 * amount of memory to handle that. Locate the interpreter, if any.
3235 */
3236 loaddr = -1, hiaddr = 0;
3237 info->alignment = 0;
3238 info->exec_stack = EXSTACK_DEFAULT;
3239 for (i = 0; i < ehdr->e_phnum; ++i) {
3240 struct elf_phdr *eppnt = phdr + i;
3241 if (eppnt->p_type == PT_LOAD) {
3242 abi_ulong a = eppnt->p_vaddr & TARGET_PAGE_MASK;
3243 if (a < loaddr) {
3244 loaddr = a;
3245 }
3246 a = eppnt->p_vaddr + eppnt->p_memsz - 1;
3247 if (a > hiaddr) {
3248 hiaddr = a;
3249 }
3250 ++info->nsegs;
3251 info->alignment |= eppnt->p_align;
3252 } else if (eppnt->p_type == PT_INTERP && pinterp_name) {
3253 g_autofree char *interp_name = NULL;
3254
3255 if (*pinterp_name) {
3256 error_setg(&err, "Multiple PT_INTERP entries");
3257 goto exit_errmsg;
3258 }
3259
3260 interp_name = imgsrc_read_alloc(eppnt->p_offset, eppnt->p_filesz,
3261 src, &err);
3262 if (interp_name == NULL) {
3263 goto exit_errmsg;
3264 }
3265 if (interp_name[eppnt->p_filesz - 1] != 0) {
3266 error_setg(&err, "Invalid PT_INTERP entry");
3267 goto exit_errmsg;
3268 }
3269 *pinterp_name = g_steal_pointer(&interp_name);
3270 } else if (eppnt->p_type == PT_GNU_PROPERTY) {
3271 if (!parse_elf_properties(src, info, eppnt, &err)) {
3272 goto exit_errmsg;
3273 }
3274 } else if (eppnt->p_type == PT_GNU_STACK) {
3275 info->exec_stack = eppnt->p_flags & PF_X;
3276 }
3277 }
3278
3279 load_addr = loaddr;
3280
3281 if (pinterp_name != NULL) {
3282 if (ehdr->e_type == ET_EXEC) {
3283 /*
3284 * Make sure that the low address does not conflict with
3285 * MMAP_MIN_ADDR or the QEMU application itself.
3286 */
3287 probe_guest_base(image_name, loaddr, hiaddr);
3288 } else {
3289 abi_ulong align;
3290
3291 /*
3292 * The binary is dynamic, but we still need to
3293 * select guest_base. In this case we pass a size.
3294 */
3295 probe_guest_base(image_name, 0, hiaddr - loaddr);
3296
3297 /*
3298 * Avoid collision with the loader by providing a different
3299 * default load address.
3300 */
3301 load_addr += elf_et_dyn_base;
3302
3303 /*
3304 * TODO: Better support for mmap alignment is desirable.
3305 * Since we do not have complete control over the guest
3306 * address space, we prefer the kernel to choose some address
3307 * rather than force the use of LOAD_ADDR via MAP_FIXED.
3308 * But without MAP_FIXED we cannot guarantee alignment,
3309 * only suggest it.
3310 */
3311 align = pow2ceil(info->alignment);
3312 if (align) {
3313 load_addr &= -align;
3314 }
3315 }
3316 }
3317
3318 /*
3319 * Reserve address space for all of this.
3320 *
3321 * In the case of ET_EXEC, we supply MAP_FIXED_NOREPLACE so that we get
3322 * exactly the address range that is required. Without reserved_va,
3323 * the guest address space is not isolated. We have attempted to avoid
3324 * conflict with the host program itself via probe_guest_base, but using
3325 * MAP_FIXED_NOREPLACE instead of MAP_FIXED provides an extra check.
3326 *
3327 * Otherwise this is ET_DYN, and we are searching for a location
3328 * that can hold the memory space required. If the image is
3329 * pre-linked, LOAD_ADDR will be non-zero, and the kernel should
3330 * honor that address if it happens to be free.
3331 *
3332 * In both cases, we will overwrite pages in this range with mappings
3333 * from the executable.
3334 */
3335 load_addr = target_mmap(load_addr, (size_t)hiaddr - loaddr + 1, PROT_NONE,
3336 MAP_PRIVATE | MAP_ANON | MAP_NORESERVE |
3337 (ehdr->e_type == ET_EXEC ? MAP_FIXED_NOREPLACE : 0),
3338 -1, 0);
3339 if (load_addr == -1) {
3340 goto exit_mmap;
3341 }
3342 load_bias = load_addr - loaddr;
3343
3344 if (elf_is_fdpic(ehdr)) {
3345 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs =
3346 g_malloc(sizeof(*loadsegs) * info->nsegs);
3347
3348 for (i = 0; i < ehdr->e_phnum; ++i) {
3349 switch (phdr[i].p_type) {
3350 case PT_DYNAMIC:
3351 info->pt_dynamic_addr = phdr[i].p_vaddr + load_bias;
3352 break;
3353 case PT_LOAD:
3354 loadsegs->addr = phdr[i].p_vaddr + load_bias;
3355 loadsegs->p_vaddr = phdr[i].p_vaddr;
3356 loadsegs->p_memsz = phdr[i].p_memsz;
3357 ++loadsegs;
3358 break;
3359 }
3360 }
3361 }
3362
3363 info->load_bias = load_bias;
3364 info->code_offset = load_bias;
3365 info->data_offset = load_bias;
3366 info->load_addr = load_addr;
3367 info->entry = ehdr->e_entry + load_bias;
3368 info->start_code = -1;
3369 info->end_code = 0;
3370 info->start_data = -1;
3371 info->end_data = 0;
3372 /* Usual start for brk is after all sections of the main executable. */
3373 info->brk = TARGET_PAGE_ALIGN(hiaddr + load_bias);
3374 info->elf_flags = ehdr->e_flags;
3375
3376 prot_exec = PROT_EXEC;
3377 #ifdef TARGET_AARCH64
3378 /*
3379 * If the BTI feature is present, this indicates that the executable
3380 * pages of the startup binary should be mapped with PROT_BTI, so that
3381 * branch targets are enforced.
3382 *
3383 * The startup binary is either the interpreter or the static executable.
3384 * The interpreter is responsible for all pages of a dynamic executable.
3385 *
3386 * Elf notes are backward compatible to older cpus.
3387 * Do not enable BTI unless it is supported.
3388 */
3389 if ((info->note_flags & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)
3390 && (pinterp_name == NULL || *pinterp_name == 0)
3391 && cpu_isar_feature(aa64_bti, ARM_CPU(thread_cpu))) {
3392 prot_exec |= TARGET_PROT_BTI;
3393 }
3394 #endif
3395
3396 for (i = 0; i < ehdr->e_phnum; i++) {
3397 struct elf_phdr *eppnt = phdr + i;
3398 if (eppnt->p_type == PT_LOAD) {
3399 abi_ulong vaddr, vaddr_po, vaddr_ps, vaddr_ef, vaddr_em;
3400 int elf_prot = 0;
3401
3402 if (eppnt->p_flags & PF_R) {
3403 elf_prot |= PROT_READ;
3404 }
3405 if (eppnt->p_flags & PF_W) {
3406 elf_prot |= PROT_WRITE;
3407 }
3408 if (eppnt->p_flags & PF_X) {
3409 elf_prot |= prot_exec;
3410 }
3411
3412 vaddr = load_bias + eppnt->p_vaddr;
3413 vaddr_po = vaddr & ~TARGET_PAGE_MASK;
3414 vaddr_ps = vaddr & TARGET_PAGE_MASK;
3415
3416 vaddr_ef = vaddr + eppnt->p_filesz;
3417 vaddr_em = vaddr + eppnt->p_memsz;
3418
3419 /*
3420 * Some segments may be completely empty, with a non-zero p_memsz
3421 * but no backing file segment.
3422 */
3423 if (eppnt->p_filesz != 0) {
3424 error = imgsrc_mmap(vaddr_ps, eppnt->p_filesz + vaddr_po,
3425 elf_prot, MAP_PRIVATE | MAP_FIXED,
3426 src, eppnt->p_offset - vaddr_po);
3427 if (error == -1) {
3428 goto exit_mmap;
3429 }
3430 }
3431
3432 /* If the load segment requests extra zeros (e.g. bss), map it. */
3433 if (vaddr_ef < vaddr_em &&
3434 !zero_bss(vaddr_ef, vaddr_em, elf_prot, &err)) {
3435 goto exit_errmsg;
3436 }
3437
3438 /* Find the full program boundaries. */
3439 if (elf_prot & PROT_EXEC) {
3440 if (vaddr < info->start_code) {
3441 info->start_code = vaddr;
3442 }
3443 if (vaddr_ef > info->end_code) {
3444 info->end_code = vaddr_ef;
3445 }
3446 }
3447 if (elf_prot & PROT_WRITE) {
3448 if (vaddr < info->start_data) {
3449 info->start_data = vaddr;
3450 }
3451 if (vaddr_ef > info->end_data) {
3452 info->end_data = vaddr_ef;
3453 }
3454 }
3455 #ifdef TARGET_MIPS
3456 } else if (eppnt->p_type == PT_MIPS_ABIFLAGS) {
3457 Mips_elf_abiflags_v0 abiflags;
3458
3459 if (!imgsrc_read(&abiflags, eppnt->p_offset, sizeof(abiflags),
3460 src, &err)) {
3461 goto exit_errmsg;
3462 }
3463 bswap_mips_abiflags(&abiflags);
3464 info->fp_abi = abiflags.fp_abi;
3465 #endif
3466 }
3467 }
3468
3469 if (info->end_data == 0) {
3470 info->start_data = info->end_code;
3471 info->end_data = info->end_code;
3472 }
3473
3474 if (qemu_log_enabled()) {
3475 load_symbols(ehdr, src, load_bias);
3476 }
3477
3478 debuginfo_report_elf(image_name, src->fd, load_bias);
3479
3480 mmap_unlock();
3481
3482 close(src->fd);
3483 return;
3484
3485 exit_mmap:
3486 error_setg_errno(&err, errno, "Error mapping file");
3487 goto exit_errmsg;
3488 exit_errmsg:
3489 error_reportf_err(err, "%s: ", image_name);
3490 exit(-1);
3491 }
3492
load_elf_interp(const char * filename,struct image_info * info,char bprm_buf[BPRM_BUF_SIZE])3493 static void load_elf_interp(const char *filename, struct image_info *info,
3494 char bprm_buf[BPRM_BUF_SIZE])
3495 {
3496 struct elfhdr ehdr;
3497 ImageSource src;
3498 int fd, retval;
3499 Error *err = NULL;
3500
3501 fd = open(path(filename), O_RDONLY);
3502 if (fd < 0) {
3503 error_setg_file_open(&err, errno, filename);
3504 error_report_err(err);
3505 exit(-1);
3506 }
3507
3508 retval = read(fd, bprm_buf, BPRM_BUF_SIZE);
3509 if (retval < 0) {
3510 error_setg_errno(&err, errno, "Error reading file header");
3511 error_reportf_err(err, "%s: ", filename);
3512 exit(-1);
3513 }
3514
3515 src.fd = fd;
3516 src.cache = bprm_buf;
3517 src.cache_size = retval;
3518
3519 load_elf_image(filename, &src, info, &ehdr, NULL);
3520 }
3521
3522 #ifdef VDSO_HEADER
3523 #include VDSO_HEADER
3524 #define vdso_image_info() &vdso_image_info
3525 #else
3526 #define vdso_image_info() NULL
3527 #endif
3528
load_elf_vdso(struct image_info * info,const VdsoImageInfo * vdso)3529 static void load_elf_vdso(struct image_info *info, const VdsoImageInfo *vdso)
3530 {
3531 ImageSource src;
3532 struct elfhdr ehdr;
3533 abi_ulong load_bias, load_addr;
3534
3535 src.fd = -1;
3536 src.cache = vdso->image;
3537 src.cache_size = vdso->image_size;
3538
3539 load_elf_image("<internal-vdso>", &src, info, &ehdr, NULL);
3540 load_addr = info->load_addr;
3541 load_bias = info->load_bias;
3542
3543 /*
3544 * We need to relocate the VDSO image. The one built into the kernel
3545 * is built for a fixed address. The one built for QEMU is not, since
3546 * that requires close control of the guest address space.
3547 * We pre-processed the image to locate all of the addresses that need
3548 * to be updated.
3549 */
3550 for (unsigned i = 0, n = vdso->reloc_count; i < n; i++) {
3551 abi_ulong *addr = g2h_untagged(load_addr + vdso->relocs[i]);
3552 *addr = tswapal(tswapal(*addr) + load_bias);
3553 }
3554
3555 /* Install signal trampolines, if present. */
3556 if (vdso->sigreturn_ofs) {
3557 default_sigreturn = load_addr + vdso->sigreturn_ofs;
3558 }
3559 if (vdso->rt_sigreturn_ofs) {
3560 default_rt_sigreturn = load_addr + vdso->rt_sigreturn_ofs;
3561 }
3562
3563 /* Remove write from VDSO segment. */
3564 target_mprotect(info->start_data, info->end_data - info->start_data,
3565 PROT_READ | PROT_EXEC);
3566 }
3567
symfind(const void * s0,const void * s1)3568 static int symfind(const void *s0, const void *s1)
3569 {
3570 struct elf_sym *sym = (struct elf_sym *)s1;
3571 __typeof(sym->st_value) addr = *(uint64_t *)s0;
3572 int result = 0;
3573
3574 if (addr < sym->st_value) {
3575 result = -1;
3576 } else if (addr >= sym->st_value + sym->st_size) {
3577 result = 1;
3578 }
3579 return result;
3580 }
3581
lookup_symbolxx(struct syminfo * s,uint64_t orig_addr)3582 static const char *lookup_symbolxx(struct syminfo *s, uint64_t orig_addr)
3583 {
3584 #if ELF_CLASS == ELFCLASS32
3585 struct elf_sym *syms = s->disas_symtab.elf32;
3586 #else
3587 struct elf_sym *syms = s->disas_symtab.elf64;
3588 #endif
3589
3590 // binary search
3591 struct elf_sym *sym;
3592
3593 sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind);
3594 if (sym != NULL) {
3595 return s->disas_strtab + sym->st_name;
3596 }
3597
3598 return "";
3599 }
3600
3601 /* FIXME: This should use elf_ops.h.inc */
symcmp(const void * s0,const void * s1)3602 static int symcmp(const void *s0, const void *s1)
3603 {
3604 struct elf_sym *sym0 = (struct elf_sym *)s0;
3605 struct elf_sym *sym1 = (struct elf_sym *)s1;
3606 return (sym0->st_value < sym1->st_value)
3607 ? -1
3608 : ((sym0->st_value > sym1->st_value) ? 1 : 0);
3609 }
3610
3611 /* Best attempt to load symbols from this ELF object. */
load_symbols(struct elfhdr * hdr,const ImageSource * src,abi_ulong load_bias)3612 static void load_symbols(struct elfhdr *hdr, const ImageSource *src,
3613 abi_ulong load_bias)
3614 {
3615 int i, shnum, nsyms, sym_idx = 0, str_idx = 0;
3616 g_autofree struct elf_shdr *shdr = NULL;
3617 char *strings = NULL;
3618 struct elf_sym *syms = NULL;
3619 struct elf_sym *new_syms;
3620 uint64_t segsz;
3621
3622 shnum = hdr->e_shnum;
3623 shdr = imgsrc_read_alloc(hdr->e_shoff, shnum * sizeof(struct elf_shdr),
3624 src, NULL);
3625 if (shdr == NULL) {
3626 return;
3627 }
3628
3629 bswap_shdr(shdr, shnum);
3630 for (i = 0; i < shnum; ++i) {
3631 if (shdr[i].sh_type == SHT_SYMTAB) {
3632 sym_idx = i;
3633 str_idx = shdr[i].sh_link;
3634 goto found;
3635 }
3636 }
3637
3638 /* There will be no symbol table if the file was stripped. */
3639 return;
3640
3641 found:
3642 /* Now know where the strtab and symtab are. Snarf them. */
3643
3644 segsz = shdr[str_idx].sh_size;
3645 strings = g_try_malloc(segsz);
3646 if (!strings) {
3647 goto give_up;
3648 }
3649 if (!imgsrc_read(strings, shdr[str_idx].sh_offset, segsz, src, NULL)) {
3650 goto give_up;
3651 }
3652
3653 segsz = shdr[sym_idx].sh_size;
3654 if (segsz / sizeof(struct elf_sym) > INT_MAX) {
3655 /*
3656 * Implausibly large symbol table: give up rather than ploughing
3657 * on with the number of symbols calculation overflowing.
3658 */
3659 goto give_up;
3660 }
3661 nsyms = segsz / sizeof(struct elf_sym);
3662 syms = g_try_malloc(segsz);
3663 if (!syms) {
3664 goto give_up;
3665 }
3666 if (!imgsrc_read(syms, shdr[sym_idx].sh_offset, segsz, src, NULL)) {
3667 goto give_up;
3668 }
3669
3670 for (i = 0; i < nsyms; ) {
3671 bswap_sym(syms + i);
3672 /* Throw away entries which we do not need. */
3673 if (syms[i].st_shndx == SHN_UNDEF
3674 || syms[i].st_shndx >= SHN_LORESERVE
3675 || ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
3676 if (i < --nsyms) {
3677 syms[i] = syms[nsyms];
3678 }
3679 } else {
3680 #if defined(TARGET_ARM) || defined (TARGET_MIPS)
3681 /* The bottom address bit marks a Thumb or MIPS16 symbol. */
3682 syms[i].st_value &= ~(target_ulong)1;
3683 #endif
3684 syms[i].st_value += load_bias;
3685 i++;
3686 }
3687 }
3688
3689 /* No "useful" symbol. */
3690 if (nsyms == 0) {
3691 goto give_up;
3692 }
3693
3694 /*
3695 * Attempt to free the storage associated with the local symbols
3696 * that we threw away. Whether or not this has any effect on the
3697 * memory allocation depends on the malloc implementation and how
3698 * many symbols we managed to discard.
3699 */
3700 new_syms = g_try_renew(struct elf_sym, syms, nsyms);
3701 if (new_syms == NULL) {
3702 goto give_up;
3703 }
3704 syms = new_syms;
3705
3706 qsort(syms, nsyms, sizeof(*syms), symcmp);
3707
3708 {
3709 struct syminfo *s = g_new(struct syminfo, 1);
3710
3711 s->disas_strtab = strings;
3712 s->disas_num_syms = nsyms;
3713 #if ELF_CLASS == ELFCLASS32
3714 s->disas_symtab.elf32 = syms;
3715 #else
3716 s->disas_symtab.elf64 = syms;
3717 #endif
3718 s->lookup_symbol = lookup_symbolxx;
3719 s->next = syminfos;
3720 syminfos = s;
3721 }
3722 return;
3723
3724 give_up:
3725 g_free(strings);
3726 g_free(syms);
3727 }
3728
get_elf_eflags(int fd)3729 uint32_t get_elf_eflags(int fd)
3730 {
3731 struct elfhdr ehdr;
3732 off_t offset;
3733 int ret;
3734
3735 /* Read ELF header */
3736 offset = lseek(fd, 0, SEEK_SET);
3737 if (offset == (off_t) -1) {
3738 return 0;
3739 }
3740 ret = read(fd, &ehdr, sizeof(ehdr));
3741 if (ret < sizeof(ehdr)) {
3742 return 0;
3743 }
3744 offset = lseek(fd, offset, SEEK_SET);
3745 if (offset == (off_t) -1) {
3746 return 0;
3747 }
3748
3749 /* Check ELF signature */
3750 if (!elf_check_ident(&ehdr)) {
3751 return 0;
3752 }
3753
3754 /* check header */
3755 bswap_ehdr(&ehdr);
3756 if (!elf_check_ehdr(&ehdr)) {
3757 return 0;
3758 }
3759
3760 /* return architecture id */
3761 return ehdr.e_flags;
3762 }
3763
load_elf_binary(struct linux_binprm * bprm,struct image_info * info)3764 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info)
3765 {
3766 /*
3767 * We need a copy of the elf header for passing to create_elf_tables.
3768 * We will have overwritten the original when we re-use bprm->buf
3769 * while loading the interpreter. Allocate the storage for this now
3770 * and let elf_load_image do any swapping that may be required.
3771 */
3772 struct elfhdr ehdr;
3773 struct image_info interp_info, vdso_info;
3774 char *elf_interpreter = NULL;
3775 char *scratch;
3776
3777 memset(&interp_info, 0, sizeof(interp_info));
3778 #ifdef TARGET_MIPS
3779 interp_info.fp_abi = MIPS_ABI_FP_UNKNOWN;
3780 #endif
3781
3782 load_elf_image(bprm->filename, &bprm->src, info, &ehdr, &elf_interpreter);
3783
3784 /* Do this so that we can load the interpreter, if need be. We will
3785 change some of these later */
3786 bprm->p = setup_arg_pages(bprm, info);
3787
3788 scratch = g_new0(char, TARGET_PAGE_SIZE);
3789 if (STACK_GROWS_DOWN) {
3790 bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
3791 bprm->p, info->stack_limit);
3792 info->file_string = bprm->p;
3793 bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
3794 bprm->p, info->stack_limit);
3795 info->env_strings = bprm->p;
3796 bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
3797 bprm->p, info->stack_limit);
3798 info->arg_strings = bprm->p;
3799 } else {
3800 info->arg_strings = bprm->p;
3801 bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
3802 bprm->p, info->stack_limit);
3803 info->env_strings = bprm->p;
3804 bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
3805 bprm->p, info->stack_limit);
3806 info->file_string = bprm->p;
3807 bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
3808 bprm->p, info->stack_limit);
3809 }
3810
3811 g_free(scratch);
3812
3813 if (!bprm->p) {
3814 fprintf(stderr, "%s: %s\n", bprm->filename, strerror(E2BIG));
3815 exit(-1);
3816 }
3817
3818 if (elf_interpreter) {
3819 load_elf_interp(elf_interpreter, &interp_info, bprm->buf);
3820
3821 /*
3822 * While unusual because of ELF_ET_DYN_BASE, if we are unlucky
3823 * with the mappings the interpreter can be loaded above but
3824 * near the main executable, which can leave very little room
3825 * for the heap.
3826 * If the current brk has less than 16MB, use the end of the
3827 * interpreter.
3828 */
3829 if (interp_info.brk > info->brk &&
3830 interp_info.load_bias - info->brk < 16 * MiB) {
3831 info->brk = interp_info.brk;
3832 }
3833
3834 /* If the program interpreter is one of these two, then assume
3835 an iBCS2 image. Otherwise assume a native linux image. */
3836
3837 if (strcmp(elf_interpreter, "/usr/lib/libc.so.1") == 0
3838 || strcmp(elf_interpreter, "/usr/lib/ld.so.1") == 0) {
3839 info->personality = PER_SVR4;
3840
3841 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
3842 and some applications "depend" upon this behavior. Since
3843 we do not have the power to recompile these, we emulate
3844 the SVr4 behavior. Sigh. */
3845 target_mmap(0, TARGET_PAGE_SIZE, PROT_READ | PROT_EXEC,
3846 MAP_FIXED_NOREPLACE | MAP_PRIVATE | MAP_ANONYMOUS,
3847 -1, 0);
3848 }
3849 #ifdef TARGET_MIPS
3850 info->interp_fp_abi = interp_info.fp_abi;
3851 #endif
3852 }
3853
3854 /*
3855 * Load a vdso if available, which will amongst other things contain the
3856 * signal trampolines. Otherwise, allocate a separate page for them.
3857 */
3858 const VdsoImageInfo *vdso = vdso_image_info();
3859 if (vdso) {
3860 load_elf_vdso(&vdso_info, vdso);
3861 info->vdso = vdso_info.load_bias;
3862 } else if (TARGET_ARCH_HAS_SIGTRAMP_PAGE) {
3863 abi_long tramp_page = target_mmap(0, TARGET_PAGE_SIZE,
3864 PROT_READ | PROT_WRITE,
3865 MAP_PRIVATE | MAP_ANON, -1, 0);
3866 if (tramp_page == -1) {
3867 return -errno;
3868 }
3869
3870 setup_sigtramp(tramp_page);
3871 target_mprotect(tramp_page, TARGET_PAGE_SIZE, PROT_READ | PROT_EXEC);
3872 }
3873
3874 bprm->p = create_elf_tables(bprm->p, bprm->argc, bprm->envc, &ehdr, info,
3875 elf_interpreter ? &interp_info : NULL,
3876 vdso ? &vdso_info : NULL);
3877 info->start_stack = bprm->p;
3878
3879 /* If we have an interpreter, set that as the program's entry point.
3880 Copy the load_bias as well, to help PPC64 interpret the entry
3881 point as a function descriptor. Do this after creating elf tables
3882 so that we copy the original program entry point into the AUXV. */
3883 if (elf_interpreter) {
3884 info->load_bias = interp_info.load_bias;
3885 info->entry = interp_info.entry;
3886 g_free(elf_interpreter);
3887 }
3888
3889 #ifdef USE_ELF_CORE_DUMP
3890 bprm->core_dump = &elf_core_dump;
3891 #endif
3892
3893 return 0;
3894 }
3895
3896 #ifdef USE_ELF_CORE_DUMP
3897 #include "exec/translate-all.h"
3898
3899 /*
3900 * Definitions to generate Intel SVR4-like core files.
3901 * These mostly have the same names as the SVR4 types with "target_elf_"
3902 * tacked on the front to prevent clashes with linux definitions,
3903 * and the typedef forms have been avoided. This is mostly like
3904 * the SVR4 structure, but more Linuxy, with things that Linux does
3905 * not support and which gdb doesn't really use excluded.
3906 *
3907 * Fields we don't dump (their contents is zero) in linux-user qemu
3908 * are marked with XXX.
3909 *
3910 * Core dump code is copied from linux kernel (fs/binfmt_elf.c).
3911 *
3912 * Porting ELF coredump for target is (quite) simple process. First you
3913 * define USE_ELF_CORE_DUMP in target ELF code (where init_thread() for
3914 * the target resides):
3915 *
3916 * #define USE_ELF_CORE_DUMP
3917 *
3918 * Next you define type of register set used for dumping. ELF specification
3919 * says that it needs to be array of elf_greg_t that has size of ELF_NREG.
3920 *
3921 * typedef <target_regtype> target_elf_greg_t;
3922 * #define ELF_NREG <number of registers>
3923 * typedef taret_elf_greg_t target_elf_gregset_t[ELF_NREG];
3924 *
3925 * Last step is to implement target specific function that copies registers
3926 * from given cpu into just specified register set. Prototype is:
3927 *
3928 * static void elf_core_copy_regs(taret_elf_gregset_t *regs,
3929 * const CPUArchState *env);
3930 *
3931 * Parameters:
3932 * regs - copy register values into here (allocated and zeroed by caller)
3933 * env - copy registers from here
3934 *
3935 * Example for ARM target is provided in this file.
3936 */
3937
3938 struct target_elf_siginfo {
3939 abi_int si_signo; /* signal number */
3940 abi_int si_code; /* extra code */
3941 abi_int si_errno; /* errno */
3942 };
3943
3944 struct target_elf_prstatus {
3945 struct target_elf_siginfo pr_info; /* Info associated with signal */
3946 abi_short pr_cursig; /* Current signal */
3947 abi_ulong pr_sigpend; /* XXX */
3948 abi_ulong pr_sighold; /* XXX */
3949 target_pid_t pr_pid;
3950 target_pid_t pr_ppid;
3951 target_pid_t pr_pgrp;
3952 target_pid_t pr_sid;
3953 struct target_timeval pr_utime; /* XXX User time */
3954 struct target_timeval pr_stime; /* XXX System time */
3955 struct target_timeval pr_cutime; /* XXX Cumulative user time */
3956 struct target_timeval pr_cstime; /* XXX Cumulative system time */
3957 target_elf_gregset_t pr_reg; /* GP registers */
3958 abi_int pr_fpvalid; /* XXX */
3959 };
3960
3961 #define ELF_PRARGSZ (80) /* Number of chars for args */
3962
3963 struct target_elf_prpsinfo {
3964 char pr_state; /* numeric process state */
3965 char pr_sname; /* char for pr_state */
3966 char pr_zomb; /* zombie */
3967 char pr_nice; /* nice val */
3968 abi_ulong pr_flag; /* flags */
3969 target_uid_t pr_uid;
3970 target_gid_t pr_gid;
3971 target_pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
3972 /* Lots missing */
3973 char pr_fname[16] QEMU_NONSTRING; /* filename of executable */
3974 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
3975 };
3976
3977 #ifdef BSWAP_NEEDED
bswap_prstatus(struct target_elf_prstatus * prstatus)3978 static void bswap_prstatus(struct target_elf_prstatus *prstatus)
3979 {
3980 prstatus->pr_info.si_signo = tswap32(prstatus->pr_info.si_signo);
3981 prstatus->pr_info.si_code = tswap32(prstatus->pr_info.si_code);
3982 prstatus->pr_info.si_errno = tswap32(prstatus->pr_info.si_errno);
3983 prstatus->pr_cursig = tswap16(prstatus->pr_cursig);
3984 prstatus->pr_sigpend = tswapal(prstatus->pr_sigpend);
3985 prstatus->pr_sighold = tswapal(prstatus->pr_sighold);
3986 prstatus->pr_pid = tswap32(prstatus->pr_pid);
3987 prstatus->pr_ppid = tswap32(prstatus->pr_ppid);
3988 prstatus->pr_pgrp = tswap32(prstatus->pr_pgrp);
3989 prstatus->pr_sid = tswap32(prstatus->pr_sid);
3990 /* cpu times are not filled, so we skip them */
3991 /* regs should be in correct format already */
3992 prstatus->pr_fpvalid = tswap32(prstatus->pr_fpvalid);
3993 }
3994
bswap_psinfo(struct target_elf_prpsinfo * psinfo)3995 static void bswap_psinfo(struct target_elf_prpsinfo *psinfo)
3996 {
3997 psinfo->pr_flag = tswapal(psinfo->pr_flag);
3998 psinfo->pr_uid = tswap16(psinfo->pr_uid);
3999 psinfo->pr_gid = tswap16(psinfo->pr_gid);
4000 psinfo->pr_pid = tswap32(psinfo->pr_pid);
4001 psinfo->pr_ppid = tswap32(psinfo->pr_ppid);
4002 psinfo->pr_pgrp = tswap32(psinfo->pr_pgrp);
4003 psinfo->pr_sid = tswap32(psinfo->pr_sid);
4004 }
4005
bswap_note(struct elf_note * en)4006 static void bswap_note(struct elf_note *en)
4007 {
4008 bswap32s(&en->n_namesz);
4009 bswap32s(&en->n_descsz);
4010 bswap32s(&en->n_type);
4011 }
4012 #else
bswap_prstatus(struct target_elf_prstatus * p)4013 static inline void bswap_prstatus(struct target_elf_prstatus *p) { }
bswap_psinfo(struct target_elf_prpsinfo * p)4014 static inline void bswap_psinfo(struct target_elf_prpsinfo *p) {}
bswap_note(struct elf_note * en)4015 static inline void bswap_note(struct elf_note *en) { }
4016 #endif /* BSWAP_NEEDED */
4017
4018 /*
4019 * Calculate file (dump) size of given memory region.
4020 */
vma_dump_size(target_ulong start,target_ulong end,unsigned long flags)4021 static size_t vma_dump_size(target_ulong start, target_ulong end,
4022 unsigned long flags)
4023 {
4024 /* The area must be readable. */
4025 if (!(flags & PAGE_READ)) {
4026 return 0;
4027 }
4028
4029 /*
4030 * Usually we don't dump executable pages as they contain
4031 * non-writable code that debugger can read directly from
4032 * target library etc. If there is no elf header, we dump it.
4033 */
4034 if (!(flags & PAGE_WRITE_ORG) &&
4035 (flags & PAGE_EXEC) &&
4036 memcmp(g2h_untagged(start), ELFMAG, SELFMAG) == 0) {
4037 return 0;
4038 }
4039
4040 return end - start;
4041 }
4042
size_note(const char * name,size_t datasz)4043 static size_t size_note(const char *name, size_t datasz)
4044 {
4045 size_t namesz = strlen(name) + 1;
4046
4047 namesz = ROUND_UP(namesz, 4);
4048 datasz = ROUND_UP(datasz, 4);
4049
4050 return sizeof(struct elf_note) + namesz + datasz;
4051 }
4052
fill_note(void ** pptr,int type,const char * name,size_t datasz)4053 static void *fill_note(void **pptr, int type, const char *name, size_t datasz)
4054 {
4055 void *ptr = *pptr;
4056 struct elf_note *n = ptr;
4057 size_t namesz = strlen(name) + 1;
4058
4059 n->n_namesz = namesz;
4060 n->n_descsz = datasz;
4061 n->n_type = type;
4062 bswap_note(n);
4063
4064 ptr += sizeof(*n);
4065 memcpy(ptr, name, namesz);
4066
4067 namesz = ROUND_UP(namesz, 4);
4068 datasz = ROUND_UP(datasz, 4);
4069
4070 *pptr = ptr + namesz + datasz;
4071 return ptr + namesz;
4072 }
4073
fill_elf_header(struct elfhdr * elf,int segs,uint16_t machine,uint32_t flags)4074 static void fill_elf_header(struct elfhdr *elf, int segs, uint16_t machine,
4075 uint32_t flags)
4076 {
4077 memcpy(elf->e_ident, ELFMAG, SELFMAG);
4078
4079 elf->e_ident[EI_CLASS] = ELF_CLASS;
4080 elf->e_ident[EI_DATA] = ELF_DATA;
4081 elf->e_ident[EI_VERSION] = EV_CURRENT;
4082 elf->e_ident[EI_OSABI] = ELF_OSABI;
4083
4084 elf->e_type = ET_CORE;
4085 elf->e_machine = machine;
4086 elf->e_version = EV_CURRENT;
4087 elf->e_phoff = sizeof(struct elfhdr);
4088 elf->e_flags = flags;
4089 elf->e_ehsize = sizeof(struct elfhdr);
4090 elf->e_phentsize = sizeof(struct elf_phdr);
4091 elf->e_phnum = segs;
4092
4093 bswap_ehdr(elf);
4094 }
4095
fill_elf_note_phdr(struct elf_phdr * phdr,size_t sz,off_t offset)4096 static void fill_elf_note_phdr(struct elf_phdr *phdr, size_t sz, off_t offset)
4097 {
4098 phdr->p_type = PT_NOTE;
4099 phdr->p_offset = offset;
4100 phdr->p_filesz = sz;
4101
4102 bswap_phdr(phdr, 1);
4103 }
4104
fill_prstatus_note(void * data,const TaskState * ts,CPUState * cpu,int signr)4105 static void fill_prstatus_note(void *data, const TaskState *ts,
4106 CPUState *cpu, int signr)
4107 {
4108 /*
4109 * Because note memory is only aligned to 4, and target_elf_prstatus
4110 * may well have higher alignment requirements, fill locally and
4111 * memcpy to the destination afterward.
4112 */
4113 struct target_elf_prstatus prstatus = {
4114 .pr_info.si_signo = signr,
4115 .pr_cursig = signr,
4116 .pr_pid = ts->ts_tid,
4117 .pr_ppid = getppid(),
4118 .pr_pgrp = getpgrp(),
4119 .pr_sid = getsid(0),
4120 };
4121
4122 elf_core_copy_regs(&prstatus.pr_reg, cpu_env(cpu));
4123 bswap_prstatus(&prstatus);
4124 memcpy(data, &prstatus, sizeof(prstatus));
4125 }
4126
fill_prpsinfo_note(void * data,const TaskState * ts)4127 static void fill_prpsinfo_note(void *data, const TaskState *ts)
4128 {
4129 /*
4130 * Because note memory is only aligned to 4, and target_elf_prpsinfo
4131 * may well have higher alignment requirements, fill locally and
4132 * memcpy to the destination afterward.
4133 */
4134 struct target_elf_prpsinfo psinfo = {
4135 .pr_pid = getpid(),
4136 .pr_ppid = getppid(),
4137 .pr_pgrp = getpgrp(),
4138 .pr_sid = getsid(0),
4139 .pr_uid = getuid(),
4140 .pr_gid = getgid(),
4141 };
4142 char *base_filename;
4143 size_t len;
4144
4145 len = ts->info->env_strings - ts->info->arg_strings;
4146 len = MIN(len, ELF_PRARGSZ);
4147 memcpy(&psinfo.pr_psargs, g2h_untagged(ts->info->arg_strings), len);
4148 for (size_t i = 0; i < len; i++) {
4149 if (psinfo.pr_psargs[i] == 0) {
4150 psinfo.pr_psargs[i] = ' ';
4151 }
4152 }
4153
4154 base_filename = g_path_get_basename(ts->bprm->filename);
4155 /*
4156 * Using strncpy here is fine: at max-length,
4157 * this field is not NUL-terminated.
4158 */
4159 strncpy(psinfo.pr_fname, base_filename, sizeof(psinfo.pr_fname));
4160 g_free(base_filename);
4161
4162 bswap_psinfo(&psinfo);
4163 memcpy(data, &psinfo, sizeof(psinfo));
4164 }
4165
fill_auxv_note(void * data,const TaskState * ts)4166 static void fill_auxv_note(void *data, const TaskState *ts)
4167 {
4168 memcpy(data, g2h_untagged(ts->info->saved_auxv), ts->info->auxv_len);
4169 }
4170
4171 /*
4172 * Constructs name of coredump file. We have following convention
4173 * for the name:
4174 * qemu_<basename-of-target-binary>_<date>-<time>_<pid>.core
4175 *
4176 * Returns the filename
4177 */
core_dump_filename(const TaskState * ts)4178 static char *core_dump_filename(const TaskState *ts)
4179 {
4180 g_autoptr(GDateTime) now = g_date_time_new_now_local();
4181 g_autofree char *nowstr = g_date_time_format(now, "%Y%m%d-%H%M%S");
4182 g_autofree char *base_filename = g_path_get_basename(ts->bprm->filename);
4183
4184 return g_strdup_printf("qemu_%s_%s_%d.core",
4185 base_filename, nowstr, (int)getpid());
4186 }
4187
dump_write(int fd,const void * ptr,size_t size)4188 static int dump_write(int fd, const void *ptr, size_t size)
4189 {
4190 const char *bufp = (const char *)ptr;
4191 ssize_t bytes_written, bytes_left;
4192
4193 bytes_written = 0;
4194 bytes_left = size;
4195
4196 /*
4197 * In normal conditions, single write(2) should do but
4198 * in case of socket etc. this mechanism is more portable.
4199 */
4200 do {
4201 bytes_written = write(fd, bufp, bytes_left);
4202 if (bytes_written < 0) {
4203 if (errno == EINTR)
4204 continue;
4205 return (-1);
4206 } else if (bytes_written == 0) { /* eof */
4207 return (-1);
4208 }
4209 bufp += bytes_written;
4210 bytes_left -= bytes_written;
4211 } while (bytes_left > 0);
4212
4213 return (0);
4214 }
4215
wmr_page_unprotect_regions(void * opaque,target_ulong start,target_ulong end,unsigned long flags)4216 static int wmr_page_unprotect_regions(void *opaque, target_ulong start,
4217 target_ulong end, unsigned long flags)
4218 {
4219 if ((flags & (PAGE_WRITE | PAGE_WRITE_ORG)) == PAGE_WRITE_ORG) {
4220 size_t step = MAX(TARGET_PAGE_SIZE, qemu_real_host_page_size());
4221
4222 while (1) {
4223 page_unprotect(start, 0);
4224 if (end - start <= step) {
4225 break;
4226 }
4227 start += step;
4228 }
4229 }
4230 return 0;
4231 }
4232
4233 typedef struct {
4234 unsigned count;
4235 size_t size;
4236 } CountAndSizeRegions;
4237
wmr_count_and_size_regions(void * opaque,target_ulong start,target_ulong end,unsigned long flags)4238 static int wmr_count_and_size_regions(void *opaque, target_ulong start,
4239 target_ulong end, unsigned long flags)
4240 {
4241 CountAndSizeRegions *css = opaque;
4242
4243 css->count++;
4244 css->size += vma_dump_size(start, end, flags);
4245 return 0;
4246 }
4247
4248 typedef struct {
4249 struct elf_phdr *phdr;
4250 off_t offset;
4251 } FillRegionPhdr;
4252
wmr_fill_region_phdr(void * opaque,target_ulong start,target_ulong end,unsigned long flags)4253 static int wmr_fill_region_phdr(void *opaque, target_ulong start,
4254 target_ulong end, unsigned long flags)
4255 {
4256 FillRegionPhdr *d = opaque;
4257 struct elf_phdr *phdr = d->phdr;
4258
4259 phdr->p_type = PT_LOAD;
4260 phdr->p_vaddr = start;
4261 phdr->p_paddr = 0;
4262 phdr->p_filesz = vma_dump_size(start, end, flags);
4263 phdr->p_offset = d->offset;
4264 d->offset += phdr->p_filesz;
4265 phdr->p_memsz = end - start;
4266 phdr->p_flags = (flags & PAGE_READ ? PF_R : 0)
4267 | (flags & PAGE_WRITE_ORG ? PF_W : 0)
4268 | (flags & PAGE_EXEC ? PF_X : 0);
4269 phdr->p_align = ELF_EXEC_PAGESIZE;
4270
4271 bswap_phdr(phdr, 1);
4272 d->phdr = phdr + 1;
4273 return 0;
4274 }
4275
wmr_write_region(void * opaque,target_ulong start,target_ulong end,unsigned long flags)4276 static int wmr_write_region(void *opaque, target_ulong start,
4277 target_ulong end, unsigned long flags)
4278 {
4279 int fd = *(int *)opaque;
4280 size_t size = vma_dump_size(start, end, flags);
4281
4282 if (!size) {
4283 return 0;
4284 }
4285 return dump_write(fd, g2h_untagged(start), size);
4286 }
4287
4288 /*
4289 * Write out ELF coredump.
4290 *
4291 * See documentation of ELF object file format in:
4292 * http://www.caldera.com/developers/devspecs/gabi41.pdf
4293 *
4294 * Coredump format in linux is following:
4295 *
4296 * 0 +----------------------+ \
4297 * | ELF header | ET_CORE |
4298 * +----------------------+ |
4299 * | ELF program headers | |--- headers
4300 * | - NOTE section | |
4301 * | - PT_LOAD sections | |
4302 * +----------------------+ /
4303 * | NOTEs: |
4304 * | - NT_PRSTATUS |
4305 * | - NT_PRSINFO |
4306 * | - NT_AUXV |
4307 * +----------------------+ <-- aligned to target page
4308 * | Process memory dump |
4309 * : :
4310 * . .
4311 * : :
4312 * | |
4313 * +----------------------+
4314 *
4315 * NT_PRSTATUS -> struct elf_prstatus (per thread)
4316 * NT_PRSINFO -> struct elf_prpsinfo
4317 * NT_AUXV is array of { type, value } pairs (see fill_auxv_note()).
4318 *
4319 * Format follows System V format as close as possible. Current
4320 * version limitations are as follows:
4321 * - no floating point registers are dumped
4322 *
4323 * Function returns 0 in case of success, negative errno otherwise.
4324 *
4325 * TODO: make this work also during runtime: it should be
4326 * possible to force coredump from running process and then
4327 * continue processing. For example qemu could set up SIGUSR2
4328 * handler (provided that target process haven't registered
4329 * handler for that) that does the dump when signal is received.
4330 */
elf_core_dump(int signr,const CPUArchState * env)4331 static int elf_core_dump(int signr, const CPUArchState *env)
4332 {
4333 const CPUState *cpu = env_cpu((CPUArchState *)env);
4334 const TaskState *ts = (const TaskState *)get_task_state((CPUState *)cpu);
4335 struct rlimit dumpsize;
4336 CountAndSizeRegions css;
4337 off_t offset, note_offset, data_offset;
4338 size_t note_size;
4339 int cpus, ret;
4340 int fd = -1;
4341 CPUState *cpu_iter;
4342
4343 if (prctl(PR_GET_DUMPABLE) == 0) {
4344 return 0;
4345 }
4346
4347 if (getrlimit(RLIMIT_CORE, &dumpsize) < 0 || dumpsize.rlim_cur == 0) {
4348 return 0;
4349 }
4350
4351 cpu_list_lock();
4352 mmap_lock();
4353
4354 /* By unprotecting, we merge vmas that might be split. */
4355 walk_memory_regions(NULL, wmr_page_unprotect_regions);
4356
4357 /*
4358 * Walk through target process memory mappings and
4359 * set up structure containing this information.
4360 */
4361 memset(&css, 0, sizeof(css));
4362 walk_memory_regions(&css, wmr_count_and_size_regions);
4363
4364 cpus = 0;
4365 CPU_FOREACH(cpu_iter) {
4366 cpus++;
4367 }
4368
4369 offset = sizeof(struct elfhdr);
4370 offset += (css.count + 1) * sizeof(struct elf_phdr);
4371 note_offset = offset;
4372
4373 offset += size_note("CORE", ts->info->auxv_len);
4374 offset += size_note("CORE", sizeof(struct target_elf_prpsinfo));
4375 offset += size_note("CORE", sizeof(struct target_elf_prstatus)) * cpus;
4376 note_size = offset - note_offset;
4377 data_offset = ROUND_UP(offset, ELF_EXEC_PAGESIZE);
4378
4379 /* Do not dump if the corefile size exceeds the limit. */
4380 if (dumpsize.rlim_cur != RLIM_INFINITY
4381 && dumpsize.rlim_cur < data_offset + css.size) {
4382 errno = 0;
4383 goto out;
4384 }
4385
4386 {
4387 g_autofree char *corefile = core_dump_filename(ts);
4388 fd = open(corefile, O_WRONLY | O_CREAT | O_TRUNC,
4389 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
4390 }
4391 if (fd < 0) {
4392 goto out;
4393 }
4394
4395 /*
4396 * There is a fair amount of alignment padding within the notes
4397 * as well as preceeding the process memory. Allocate a zeroed
4398 * block to hold it all. Write all of the headers directly into
4399 * this buffer and then write it out as a block.
4400 */
4401 {
4402 g_autofree void *header = g_malloc0(data_offset);
4403 FillRegionPhdr frp;
4404 void *hptr, *dptr;
4405
4406 /* Create elf file header. */
4407 hptr = header;
4408 fill_elf_header(hptr, css.count + 1, ELF_MACHINE, 0);
4409 hptr += sizeof(struct elfhdr);
4410
4411 /* Create elf program headers. */
4412 fill_elf_note_phdr(hptr, note_size, note_offset);
4413 hptr += sizeof(struct elf_phdr);
4414
4415 frp.phdr = hptr;
4416 frp.offset = data_offset;
4417 walk_memory_regions(&frp, wmr_fill_region_phdr);
4418 hptr = frp.phdr;
4419
4420 /* Create the notes. */
4421 dptr = fill_note(&hptr, NT_AUXV, "CORE", ts->info->auxv_len);
4422 fill_auxv_note(dptr, ts);
4423
4424 dptr = fill_note(&hptr, NT_PRPSINFO, "CORE",
4425 sizeof(struct target_elf_prpsinfo));
4426 fill_prpsinfo_note(dptr, ts);
4427
4428 CPU_FOREACH(cpu_iter) {
4429 dptr = fill_note(&hptr, NT_PRSTATUS, "CORE",
4430 sizeof(struct target_elf_prstatus));
4431 fill_prstatus_note(dptr, ts, cpu_iter,
4432 cpu_iter == cpu ? signr : 0);
4433 }
4434
4435 if (dump_write(fd, header, data_offset) < 0) {
4436 goto out;
4437 }
4438 }
4439
4440 /*
4441 * Finally write process memory into the corefile as well.
4442 */
4443 if (walk_memory_regions(&fd, wmr_write_region) < 0) {
4444 goto out;
4445 }
4446 errno = 0;
4447
4448 out:
4449 ret = -errno;
4450 mmap_unlock();
4451 cpu_list_unlock();
4452 if (fd >= 0) {
4453 close(fd);
4454 }
4455 return ret;
4456 }
4457 #endif /* USE_ELF_CORE_DUMP */
4458
do_init_thread(struct target_pt_regs * regs,struct image_info * infop)4459 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
4460 {
4461 init_thread(regs, infop);
4462 }
4463