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/resource.h> 6 #include <sys/shm.h> 7 8 #include "qemu.h" 9 #include "user-internals.h" 10 #include "signal-common.h" 11 #include "loader.h" 12 #include "user-mmap.h" 13 #include "disas/disas.h" 14 #include "qemu/bitops.h" 15 #include "qemu/path.h" 16 #include "qemu/queue.h" 17 #include "qemu/guest-random.h" 18 #include "qemu/units.h" 19 #include "qemu/selfmap.h" 20 #include "qemu/lockable.h" 21 #include "qapi/error.h" 22 #include "qemu/error-report.h" 23 #include "target_signal.h" 24 #include "accel/tcg/debuginfo.h" 25 26 #ifdef _ARCH_PPC64 27 #undef ARCH_DLINFO 28 #undef ELF_PLATFORM 29 #undef ELF_HWCAP 30 #undef ELF_HWCAP2 31 #undef ELF_CLASS 32 #undef ELF_DATA 33 #undef ELF_ARCH 34 #endif 35 36 #define ELF_OSABI ELFOSABI_SYSV 37 38 /* from personality.h */ 39 40 /* 41 * Flags for bug emulation. 42 * 43 * These occupy the top three bytes. 44 */ 45 enum { 46 ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */ 47 FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to 48 descriptors (signal handling) */ 49 MMAP_PAGE_ZERO = 0x0100000, 50 ADDR_COMPAT_LAYOUT = 0x0200000, 51 READ_IMPLIES_EXEC = 0x0400000, 52 ADDR_LIMIT_32BIT = 0x0800000, 53 SHORT_INODE = 0x1000000, 54 WHOLE_SECONDS = 0x2000000, 55 STICKY_TIMEOUTS = 0x4000000, 56 ADDR_LIMIT_3GB = 0x8000000, 57 }; 58 59 /* 60 * Personality types. 61 * 62 * These go in the low byte. Avoid using the top bit, it will 63 * conflict with error returns. 64 */ 65 enum { 66 PER_LINUX = 0x0000, 67 PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT, 68 PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS, 69 PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO, 70 PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE, 71 PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS | SHORT_INODE, 72 PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS, 73 PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE, 74 PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS, 75 PER_BSD = 0x0006, 76 PER_SUNOS = 0x0006 | STICKY_TIMEOUTS, 77 PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE, 78 PER_LINUX32 = 0x0008, 79 PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB, 80 PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */ 81 PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */ 82 PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */ 83 PER_RISCOS = 0x000c, 84 PER_SOLARIS = 0x000d | STICKY_TIMEOUTS, 85 PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO, 86 PER_OSF4 = 0x000f, /* OSF/1 v4 */ 87 PER_HPUX = 0x0010, 88 PER_MASK = 0x00ff, 89 }; 90 91 /* 92 * Return the base personality without flags. 93 */ 94 #define personality(pers) (pers & PER_MASK) 95 96 int info_is_fdpic(struct image_info *info) 97 { 98 return info->personality == PER_LINUX_FDPIC; 99 } 100 101 /* this flag is uneffective under linux too, should be deleted */ 102 #ifndef MAP_DENYWRITE 103 #define MAP_DENYWRITE 0 104 #endif 105 106 /* should probably go in elf.h */ 107 #ifndef ELIBBAD 108 #define ELIBBAD 80 109 #endif 110 111 #if TARGET_BIG_ENDIAN 112 #define ELF_DATA ELFDATA2MSB 113 #else 114 #define ELF_DATA ELFDATA2LSB 115 #endif 116 117 #ifdef TARGET_ABI_MIPSN32 118 typedef abi_ullong target_elf_greg_t; 119 #define tswapreg(ptr) tswap64(ptr) 120 #else 121 typedef abi_ulong target_elf_greg_t; 122 #define tswapreg(ptr) tswapal(ptr) 123 #endif 124 125 #ifdef USE_UID16 126 typedef abi_ushort target_uid_t; 127 typedef abi_ushort target_gid_t; 128 #else 129 typedef abi_uint target_uid_t; 130 typedef abi_uint target_gid_t; 131 #endif 132 typedef abi_int target_pid_t; 133 134 #ifdef TARGET_I386 135 136 #define ELF_HWCAP get_elf_hwcap() 137 138 static uint32_t get_elf_hwcap(void) 139 { 140 X86CPU *cpu = X86_CPU(thread_cpu); 141 142 return cpu->env.features[FEAT_1_EDX]; 143 } 144 145 #ifdef TARGET_X86_64 146 #define ELF_START_MMAP 0x2aaaaab000ULL 147 148 #define ELF_CLASS ELFCLASS64 149 #define ELF_ARCH EM_X86_64 150 151 #define ELF_PLATFORM "x86_64" 152 153 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) 154 { 155 regs->rax = 0; 156 regs->rsp = infop->start_stack; 157 regs->rip = infop->entry; 158 } 159 160 #define ELF_NREG 27 161 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 162 163 /* 164 * Note that ELF_NREG should be 29 as there should be place for 165 * TRAPNO and ERR "registers" as well but linux doesn't dump 166 * those. 167 * 168 * See linux kernel: arch/x86/include/asm/elf.h 169 */ 170 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env) 171 { 172 (*regs)[0] = tswapreg(env->regs[15]); 173 (*regs)[1] = tswapreg(env->regs[14]); 174 (*regs)[2] = tswapreg(env->regs[13]); 175 (*regs)[3] = tswapreg(env->regs[12]); 176 (*regs)[4] = tswapreg(env->regs[R_EBP]); 177 (*regs)[5] = tswapreg(env->regs[R_EBX]); 178 (*regs)[6] = tswapreg(env->regs[11]); 179 (*regs)[7] = tswapreg(env->regs[10]); 180 (*regs)[8] = tswapreg(env->regs[9]); 181 (*regs)[9] = tswapreg(env->regs[8]); 182 (*regs)[10] = tswapreg(env->regs[R_EAX]); 183 (*regs)[11] = tswapreg(env->regs[R_ECX]); 184 (*regs)[12] = tswapreg(env->regs[R_EDX]); 185 (*regs)[13] = tswapreg(env->regs[R_ESI]); 186 (*regs)[14] = tswapreg(env->regs[R_EDI]); 187 (*regs)[15] = tswapreg(env->regs[R_EAX]); /* XXX */ 188 (*regs)[16] = tswapreg(env->eip); 189 (*regs)[17] = tswapreg(env->segs[R_CS].selector & 0xffff); 190 (*regs)[18] = tswapreg(env->eflags); 191 (*regs)[19] = tswapreg(env->regs[R_ESP]); 192 (*regs)[20] = tswapreg(env->segs[R_SS].selector & 0xffff); 193 (*regs)[21] = tswapreg(env->segs[R_FS].selector & 0xffff); 194 (*regs)[22] = tswapreg(env->segs[R_GS].selector & 0xffff); 195 (*regs)[23] = tswapreg(env->segs[R_DS].selector & 0xffff); 196 (*regs)[24] = tswapreg(env->segs[R_ES].selector & 0xffff); 197 (*regs)[25] = tswapreg(env->segs[R_FS].selector & 0xffff); 198 (*regs)[26] = tswapreg(env->segs[R_GS].selector & 0xffff); 199 } 200 201 #if ULONG_MAX > UINT32_MAX 202 #define INIT_GUEST_COMMPAGE 203 static bool init_guest_commpage(void) 204 { 205 /* 206 * The vsyscall page is at a high negative address aka kernel space, 207 * which means that we cannot actually allocate it with target_mmap. 208 * We still should be able to use page_set_flags, unless the user 209 * has specified -R reserved_va, which would trigger an assert(). 210 */ 211 if (reserved_va != 0 && 212 TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE - 1 > reserved_va) { 213 error_report("Cannot allocate vsyscall page"); 214 exit(EXIT_FAILURE); 215 } 216 page_set_flags(TARGET_VSYSCALL_PAGE, 217 TARGET_VSYSCALL_PAGE | ~TARGET_PAGE_MASK, 218 PAGE_EXEC | PAGE_VALID); 219 return true; 220 } 221 #endif 222 #else 223 224 #define ELF_START_MMAP 0x80000000 225 226 /* 227 * This is used to ensure we don't load something for the wrong architecture. 228 */ 229 #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) ) 230 231 /* 232 * These are used to set parameters in the core dumps. 233 */ 234 #define ELF_CLASS ELFCLASS32 235 #define ELF_ARCH EM_386 236 237 #define ELF_PLATFORM get_elf_platform() 238 #define EXSTACK_DEFAULT true 239 240 static const char *get_elf_platform(void) 241 { 242 static char elf_platform[] = "i386"; 243 int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL); 244 if (family > 6) { 245 family = 6; 246 } 247 if (family >= 3) { 248 elf_platform[1] = '0' + family; 249 } 250 return elf_platform; 251 } 252 253 static inline void init_thread(struct target_pt_regs *regs, 254 struct image_info *infop) 255 { 256 regs->esp = infop->start_stack; 257 regs->eip = infop->entry; 258 259 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program 260 starts %edx contains a pointer to a function which might be 261 registered using `atexit'. This provides a mean for the 262 dynamic linker to call DT_FINI functions for shared libraries 263 that have been loaded before the code runs. 264 265 A value of 0 tells we have no such handler. */ 266 regs->edx = 0; 267 } 268 269 #define ELF_NREG 17 270 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 271 272 /* 273 * Note that ELF_NREG should be 19 as there should be place for 274 * TRAPNO and ERR "registers" as well but linux doesn't dump 275 * those. 276 * 277 * See linux kernel: arch/x86/include/asm/elf.h 278 */ 279 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env) 280 { 281 (*regs)[0] = tswapreg(env->regs[R_EBX]); 282 (*regs)[1] = tswapreg(env->regs[R_ECX]); 283 (*regs)[2] = tswapreg(env->regs[R_EDX]); 284 (*regs)[3] = tswapreg(env->regs[R_ESI]); 285 (*regs)[4] = tswapreg(env->regs[R_EDI]); 286 (*regs)[5] = tswapreg(env->regs[R_EBP]); 287 (*regs)[6] = tswapreg(env->regs[R_EAX]); 288 (*regs)[7] = tswapreg(env->segs[R_DS].selector & 0xffff); 289 (*regs)[8] = tswapreg(env->segs[R_ES].selector & 0xffff); 290 (*regs)[9] = tswapreg(env->segs[R_FS].selector & 0xffff); 291 (*regs)[10] = tswapreg(env->segs[R_GS].selector & 0xffff); 292 (*regs)[11] = tswapreg(env->regs[R_EAX]); /* XXX */ 293 (*regs)[12] = tswapreg(env->eip); 294 (*regs)[13] = tswapreg(env->segs[R_CS].selector & 0xffff); 295 (*regs)[14] = tswapreg(env->eflags); 296 (*regs)[15] = tswapreg(env->regs[R_ESP]); 297 (*regs)[16] = tswapreg(env->segs[R_SS].selector & 0xffff); 298 } 299 #endif 300 301 #define USE_ELF_CORE_DUMP 302 #define ELF_EXEC_PAGESIZE 4096 303 304 #endif 305 306 #ifdef TARGET_ARM 307 308 #ifndef TARGET_AARCH64 309 /* 32 bit ARM definitions */ 310 311 #define ELF_START_MMAP 0x80000000 312 313 #define ELF_ARCH EM_ARM 314 #define ELF_CLASS ELFCLASS32 315 #define EXSTACK_DEFAULT true 316 317 static inline void init_thread(struct target_pt_regs *regs, 318 struct image_info *infop) 319 { 320 abi_long stack = infop->start_stack; 321 memset(regs, 0, sizeof(*regs)); 322 323 regs->uregs[16] = ARM_CPU_MODE_USR; 324 if (infop->entry & 1) { 325 regs->uregs[16] |= CPSR_T; 326 } 327 regs->uregs[15] = infop->entry & 0xfffffffe; 328 regs->uregs[13] = infop->start_stack; 329 /* FIXME - what to for failure of get_user()? */ 330 get_user_ual(regs->uregs[2], stack + 8); /* envp */ 331 get_user_ual(regs->uregs[1], stack + 4); /* envp */ 332 /* XXX: it seems that r0 is zeroed after ! */ 333 regs->uregs[0] = 0; 334 /* For uClinux PIC binaries. */ 335 /* XXX: Linux does this only on ARM with no MMU (do we care ?) */ 336 regs->uregs[10] = infop->start_data; 337 338 /* Support ARM FDPIC. */ 339 if (info_is_fdpic(infop)) { 340 /* As described in the ABI document, r7 points to the loadmap info 341 * prepared by the kernel. If an interpreter is needed, r8 points 342 * to the interpreter loadmap and r9 points to the interpreter 343 * PT_DYNAMIC info. If no interpreter is needed, r8 is zero, and 344 * r9 points to the main program PT_DYNAMIC info. 345 */ 346 regs->uregs[7] = infop->loadmap_addr; 347 if (infop->interpreter_loadmap_addr) { 348 /* Executable is dynamically loaded. */ 349 regs->uregs[8] = infop->interpreter_loadmap_addr; 350 regs->uregs[9] = infop->interpreter_pt_dynamic_addr; 351 } else { 352 regs->uregs[8] = 0; 353 regs->uregs[9] = infop->pt_dynamic_addr; 354 } 355 } 356 } 357 358 #define ELF_NREG 18 359 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 360 361 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUARMState *env) 362 { 363 (*regs)[0] = tswapreg(env->regs[0]); 364 (*regs)[1] = tswapreg(env->regs[1]); 365 (*regs)[2] = tswapreg(env->regs[2]); 366 (*regs)[3] = tswapreg(env->regs[3]); 367 (*regs)[4] = tswapreg(env->regs[4]); 368 (*regs)[5] = tswapreg(env->regs[5]); 369 (*regs)[6] = tswapreg(env->regs[6]); 370 (*regs)[7] = tswapreg(env->regs[7]); 371 (*regs)[8] = tswapreg(env->regs[8]); 372 (*regs)[9] = tswapreg(env->regs[9]); 373 (*regs)[10] = tswapreg(env->regs[10]); 374 (*regs)[11] = tswapreg(env->regs[11]); 375 (*regs)[12] = tswapreg(env->regs[12]); 376 (*regs)[13] = tswapreg(env->regs[13]); 377 (*regs)[14] = tswapreg(env->regs[14]); 378 (*regs)[15] = tswapreg(env->regs[15]); 379 380 (*regs)[16] = tswapreg(cpsr_read((CPUARMState *)env)); 381 (*regs)[17] = tswapreg(env->regs[0]); /* XXX */ 382 } 383 384 #define USE_ELF_CORE_DUMP 385 #define ELF_EXEC_PAGESIZE 4096 386 387 enum 388 { 389 ARM_HWCAP_ARM_SWP = 1 << 0, 390 ARM_HWCAP_ARM_HALF = 1 << 1, 391 ARM_HWCAP_ARM_THUMB = 1 << 2, 392 ARM_HWCAP_ARM_26BIT = 1 << 3, 393 ARM_HWCAP_ARM_FAST_MULT = 1 << 4, 394 ARM_HWCAP_ARM_FPA = 1 << 5, 395 ARM_HWCAP_ARM_VFP = 1 << 6, 396 ARM_HWCAP_ARM_EDSP = 1 << 7, 397 ARM_HWCAP_ARM_JAVA = 1 << 8, 398 ARM_HWCAP_ARM_IWMMXT = 1 << 9, 399 ARM_HWCAP_ARM_CRUNCH = 1 << 10, 400 ARM_HWCAP_ARM_THUMBEE = 1 << 11, 401 ARM_HWCAP_ARM_NEON = 1 << 12, 402 ARM_HWCAP_ARM_VFPv3 = 1 << 13, 403 ARM_HWCAP_ARM_VFPv3D16 = 1 << 14, 404 ARM_HWCAP_ARM_TLS = 1 << 15, 405 ARM_HWCAP_ARM_VFPv4 = 1 << 16, 406 ARM_HWCAP_ARM_IDIVA = 1 << 17, 407 ARM_HWCAP_ARM_IDIVT = 1 << 18, 408 ARM_HWCAP_ARM_VFPD32 = 1 << 19, 409 ARM_HWCAP_ARM_LPAE = 1 << 20, 410 ARM_HWCAP_ARM_EVTSTRM = 1 << 21, 411 }; 412 413 enum { 414 ARM_HWCAP2_ARM_AES = 1 << 0, 415 ARM_HWCAP2_ARM_PMULL = 1 << 1, 416 ARM_HWCAP2_ARM_SHA1 = 1 << 2, 417 ARM_HWCAP2_ARM_SHA2 = 1 << 3, 418 ARM_HWCAP2_ARM_CRC32 = 1 << 4, 419 }; 420 421 /* The commpage only exists for 32 bit kernels */ 422 423 #define HI_COMMPAGE (intptr_t)0xffff0f00u 424 425 static bool init_guest_commpage(void) 426 { 427 ARMCPU *cpu = ARM_CPU(thread_cpu); 428 abi_ptr commpage; 429 void *want; 430 void *addr; 431 432 /* 433 * M-profile allocates maximum of 2GB address space, so can never 434 * allocate the commpage. Skip it. 435 */ 436 if (arm_feature(&cpu->env, ARM_FEATURE_M)) { 437 return true; 438 } 439 440 commpage = HI_COMMPAGE & -qemu_host_page_size; 441 want = g2h_untagged(commpage); 442 addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE, 443 MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0); 444 445 if (addr == MAP_FAILED) { 446 perror("Allocating guest commpage"); 447 exit(EXIT_FAILURE); 448 } 449 if (addr != want) { 450 return false; 451 } 452 453 /* Set kernel helper versions; rest of page is 0. */ 454 __put_user(5, (uint32_t *)g2h_untagged(0xffff0ffcu)); 455 456 if (mprotect(addr, qemu_host_page_size, PROT_READ)) { 457 perror("Protecting guest commpage"); 458 exit(EXIT_FAILURE); 459 } 460 461 page_set_flags(commpage, commpage | ~qemu_host_page_mask, 462 PAGE_READ | PAGE_EXEC | PAGE_VALID); 463 return true; 464 } 465 466 #define ELF_HWCAP get_elf_hwcap() 467 #define ELF_HWCAP2 get_elf_hwcap2() 468 469 static uint32_t get_elf_hwcap(void) 470 { 471 ARMCPU *cpu = ARM_CPU(thread_cpu); 472 uint32_t hwcaps = 0; 473 474 hwcaps |= ARM_HWCAP_ARM_SWP; 475 hwcaps |= ARM_HWCAP_ARM_HALF; 476 hwcaps |= ARM_HWCAP_ARM_THUMB; 477 hwcaps |= ARM_HWCAP_ARM_FAST_MULT; 478 479 /* probe for the extra features */ 480 #define GET_FEATURE(feat, hwcap) \ 481 do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0) 482 483 #define GET_FEATURE_ID(feat, hwcap) \ 484 do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0) 485 486 /* EDSP is in v5TE and above, but all our v5 CPUs are v5TE */ 487 GET_FEATURE(ARM_FEATURE_V5, ARM_HWCAP_ARM_EDSP); 488 GET_FEATURE(ARM_FEATURE_IWMMXT, ARM_HWCAP_ARM_IWMMXT); 489 GET_FEATURE(ARM_FEATURE_THUMB2EE, ARM_HWCAP_ARM_THUMBEE); 490 GET_FEATURE(ARM_FEATURE_NEON, ARM_HWCAP_ARM_NEON); 491 GET_FEATURE(ARM_FEATURE_V6K, ARM_HWCAP_ARM_TLS); 492 GET_FEATURE(ARM_FEATURE_LPAE, ARM_HWCAP_ARM_LPAE); 493 GET_FEATURE_ID(aa32_arm_div, ARM_HWCAP_ARM_IDIVA); 494 GET_FEATURE_ID(aa32_thumb_div, ARM_HWCAP_ARM_IDIVT); 495 GET_FEATURE_ID(aa32_vfp, ARM_HWCAP_ARM_VFP); 496 497 if (cpu_isar_feature(aa32_fpsp_v3, cpu) || 498 cpu_isar_feature(aa32_fpdp_v3, cpu)) { 499 hwcaps |= ARM_HWCAP_ARM_VFPv3; 500 if (cpu_isar_feature(aa32_simd_r32, cpu)) { 501 hwcaps |= ARM_HWCAP_ARM_VFPD32; 502 } else { 503 hwcaps |= ARM_HWCAP_ARM_VFPv3D16; 504 } 505 } 506 GET_FEATURE_ID(aa32_simdfmac, ARM_HWCAP_ARM_VFPv4); 507 508 return hwcaps; 509 } 510 511 static uint32_t get_elf_hwcap2(void) 512 { 513 ARMCPU *cpu = ARM_CPU(thread_cpu); 514 uint32_t hwcaps = 0; 515 516 GET_FEATURE_ID(aa32_aes, ARM_HWCAP2_ARM_AES); 517 GET_FEATURE_ID(aa32_pmull, ARM_HWCAP2_ARM_PMULL); 518 GET_FEATURE_ID(aa32_sha1, ARM_HWCAP2_ARM_SHA1); 519 GET_FEATURE_ID(aa32_sha2, ARM_HWCAP2_ARM_SHA2); 520 GET_FEATURE_ID(aa32_crc32, ARM_HWCAP2_ARM_CRC32); 521 return hwcaps; 522 } 523 524 #undef GET_FEATURE 525 #undef GET_FEATURE_ID 526 527 #define ELF_PLATFORM get_elf_platform() 528 529 static const char *get_elf_platform(void) 530 { 531 CPUARMState *env = thread_cpu->env_ptr; 532 533 #if TARGET_BIG_ENDIAN 534 # define END "b" 535 #else 536 # define END "l" 537 #endif 538 539 if (arm_feature(env, ARM_FEATURE_V8)) { 540 return "v8" END; 541 } else if (arm_feature(env, ARM_FEATURE_V7)) { 542 if (arm_feature(env, ARM_FEATURE_M)) { 543 return "v7m" END; 544 } else { 545 return "v7" END; 546 } 547 } else if (arm_feature(env, ARM_FEATURE_V6)) { 548 return "v6" END; 549 } else if (arm_feature(env, ARM_FEATURE_V5)) { 550 return "v5" END; 551 } else { 552 return "v4" END; 553 } 554 555 #undef END 556 } 557 558 #else 559 /* 64 bit ARM definitions */ 560 #define ELF_START_MMAP 0x80000000 561 562 #define ELF_ARCH EM_AARCH64 563 #define ELF_CLASS ELFCLASS64 564 #if TARGET_BIG_ENDIAN 565 # define ELF_PLATFORM "aarch64_be" 566 #else 567 # define ELF_PLATFORM "aarch64" 568 #endif 569 570 static inline void init_thread(struct target_pt_regs *regs, 571 struct image_info *infop) 572 { 573 abi_long stack = infop->start_stack; 574 memset(regs, 0, sizeof(*regs)); 575 576 regs->pc = infop->entry & ~0x3ULL; 577 regs->sp = stack; 578 } 579 580 #define ELF_NREG 34 581 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 582 583 static void elf_core_copy_regs(target_elf_gregset_t *regs, 584 const CPUARMState *env) 585 { 586 int i; 587 588 for (i = 0; i < 32; i++) { 589 (*regs)[i] = tswapreg(env->xregs[i]); 590 } 591 (*regs)[32] = tswapreg(env->pc); 592 (*regs)[33] = tswapreg(pstate_read((CPUARMState *)env)); 593 } 594 595 #define USE_ELF_CORE_DUMP 596 #define ELF_EXEC_PAGESIZE 4096 597 598 enum { 599 ARM_HWCAP_A64_FP = 1 << 0, 600 ARM_HWCAP_A64_ASIMD = 1 << 1, 601 ARM_HWCAP_A64_EVTSTRM = 1 << 2, 602 ARM_HWCAP_A64_AES = 1 << 3, 603 ARM_HWCAP_A64_PMULL = 1 << 4, 604 ARM_HWCAP_A64_SHA1 = 1 << 5, 605 ARM_HWCAP_A64_SHA2 = 1 << 6, 606 ARM_HWCAP_A64_CRC32 = 1 << 7, 607 ARM_HWCAP_A64_ATOMICS = 1 << 8, 608 ARM_HWCAP_A64_FPHP = 1 << 9, 609 ARM_HWCAP_A64_ASIMDHP = 1 << 10, 610 ARM_HWCAP_A64_CPUID = 1 << 11, 611 ARM_HWCAP_A64_ASIMDRDM = 1 << 12, 612 ARM_HWCAP_A64_JSCVT = 1 << 13, 613 ARM_HWCAP_A64_FCMA = 1 << 14, 614 ARM_HWCAP_A64_LRCPC = 1 << 15, 615 ARM_HWCAP_A64_DCPOP = 1 << 16, 616 ARM_HWCAP_A64_SHA3 = 1 << 17, 617 ARM_HWCAP_A64_SM3 = 1 << 18, 618 ARM_HWCAP_A64_SM4 = 1 << 19, 619 ARM_HWCAP_A64_ASIMDDP = 1 << 20, 620 ARM_HWCAP_A64_SHA512 = 1 << 21, 621 ARM_HWCAP_A64_SVE = 1 << 22, 622 ARM_HWCAP_A64_ASIMDFHM = 1 << 23, 623 ARM_HWCAP_A64_DIT = 1 << 24, 624 ARM_HWCAP_A64_USCAT = 1 << 25, 625 ARM_HWCAP_A64_ILRCPC = 1 << 26, 626 ARM_HWCAP_A64_FLAGM = 1 << 27, 627 ARM_HWCAP_A64_SSBS = 1 << 28, 628 ARM_HWCAP_A64_SB = 1 << 29, 629 ARM_HWCAP_A64_PACA = 1 << 30, 630 ARM_HWCAP_A64_PACG = 1UL << 31, 631 632 ARM_HWCAP2_A64_DCPODP = 1 << 0, 633 ARM_HWCAP2_A64_SVE2 = 1 << 1, 634 ARM_HWCAP2_A64_SVEAES = 1 << 2, 635 ARM_HWCAP2_A64_SVEPMULL = 1 << 3, 636 ARM_HWCAP2_A64_SVEBITPERM = 1 << 4, 637 ARM_HWCAP2_A64_SVESHA3 = 1 << 5, 638 ARM_HWCAP2_A64_SVESM4 = 1 << 6, 639 ARM_HWCAP2_A64_FLAGM2 = 1 << 7, 640 ARM_HWCAP2_A64_FRINT = 1 << 8, 641 ARM_HWCAP2_A64_SVEI8MM = 1 << 9, 642 ARM_HWCAP2_A64_SVEF32MM = 1 << 10, 643 ARM_HWCAP2_A64_SVEF64MM = 1 << 11, 644 ARM_HWCAP2_A64_SVEBF16 = 1 << 12, 645 ARM_HWCAP2_A64_I8MM = 1 << 13, 646 ARM_HWCAP2_A64_BF16 = 1 << 14, 647 ARM_HWCAP2_A64_DGH = 1 << 15, 648 ARM_HWCAP2_A64_RNG = 1 << 16, 649 ARM_HWCAP2_A64_BTI = 1 << 17, 650 ARM_HWCAP2_A64_MTE = 1 << 18, 651 ARM_HWCAP2_A64_ECV = 1 << 19, 652 ARM_HWCAP2_A64_AFP = 1 << 20, 653 ARM_HWCAP2_A64_RPRES = 1 << 21, 654 ARM_HWCAP2_A64_MTE3 = 1 << 22, 655 ARM_HWCAP2_A64_SME = 1 << 23, 656 ARM_HWCAP2_A64_SME_I16I64 = 1 << 24, 657 ARM_HWCAP2_A64_SME_F64F64 = 1 << 25, 658 ARM_HWCAP2_A64_SME_I8I32 = 1 << 26, 659 ARM_HWCAP2_A64_SME_F16F32 = 1 << 27, 660 ARM_HWCAP2_A64_SME_B16F32 = 1 << 28, 661 ARM_HWCAP2_A64_SME_F32F32 = 1 << 29, 662 ARM_HWCAP2_A64_SME_FA64 = 1 << 30, 663 }; 664 665 #define ELF_HWCAP get_elf_hwcap() 666 #define ELF_HWCAP2 get_elf_hwcap2() 667 668 #define GET_FEATURE_ID(feat, hwcap) \ 669 do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0) 670 671 static uint32_t get_elf_hwcap(void) 672 { 673 ARMCPU *cpu = ARM_CPU(thread_cpu); 674 uint32_t hwcaps = 0; 675 676 hwcaps |= ARM_HWCAP_A64_FP; 677 hwcaps |= ARM_HWCAP_A64_ASIMD; 678 hwcaps |= ARM_HWCAP_A64_CPUID; 679 680 /* probe for the extra features */ 681 682 GET_FEATURE_ID(aa64_aes, ARM_HWCAP_A64_AES); 683 GET_FEATURE_ID(aa64_pmull, ARM_HWCAP_A64_PMULL); 684 GET_FEATURE_ID(aa64_sha1, ARM_HWCAP_A64_SHA1); 685 GET_FEATURE_ID(aa64_sha256, ARM_HWCAP_A64_SHA2); 686 GET_FEATURE_ID(aa64_sha512, ARM_HWCAP_A64_SHA512); 687 GET_FEATURE_ID(aa64_crc32, ARM_HWCAP_A64_CRC32); 688 GET_FEATURE_ID(aa64_sha3, ARM_HWCAP_A64_SHA3); 689 GET_FEATURE_ID(aa64_sm3, ARM_HWCAP_A64_SM3); 690 GET_FEATURE_ID(aa64_sm4, ARM_HWCAP_A64_SM4); 691 GET_FEATURE_ID(aa64_fp16, ARM_HWCAP_A64_FPHP | ARM_HWCAP_A64_ASIMDHP); 692 GET_FEATURE_ID(aa64_atomics, ARM_HWCAP_A64_ATOMICS); 693 GET_FEATURE_ID(aa64_rdm, ARM_HWCAP_A64_ASIMDRDM); 694 GET_FEATURE_ID(aa64_dp, ARM_HWCAP_A64_ASIMDDP); 695 GET_FEATURE_ID(aa64_fcma, ARM_HWCAP_A64_FCMA); 696 GET_FEATURE_ID(aa64_sve, ARM_HWCAP_A64_SVE); 697 GET_FEATURE_ID(aa64_pauth, ARM_HWCAP_A64_PACA | ARM_HWCAP_A64_PACG); 698 GET_FEATURE_ID(aa64_fhm, ARM_HWCAP_A64_ASIMDFHM); 699 GET_FEATURE_ID(aa64_jscvt, ARM_HWCAP_A64_JSCVT); 700 GET_FEATURE_ID(aa64_sb, ARM_HWCAP_A64_SB); 701 GET_FEATURE_ID(aa64_condm_4, ARM_HWCAP_A64_FLAGM); 702 GET_FEATURE_ID(aa64_dcpop, ARM_HWCAP_A64_DCPOP); 703 GET_FEATURE_ID(aa64_rcpc_8_3, ARM_HWCAP_A64_LRCPC); 704 GET_FEATURE_ID(aa64_rcpc_8_4, ARM_HWCAP_A64_ILRCPC); 705 706 return hwcaps; 707 } 708 709 static uint32_t get_elf_hwcap2(void) 710 { 711 ARMCPU *cpu = ARM_CPU(thread_cpu); 712 uint32_t hwcaps = 0; 713 714 GET_FEATURE_ID(aa64_dcpodp, ARM_HWCAP2_A64_DCPODP); 715 GET_FEATURE_ID(aa64_sve2, ARM_HWCAP2_A64_SVE2); 716 GET_FEATURE_ID(aa64_sve2_aes, ARM_HWCAP2_A64_SVEAES); 717 GET_FEATURE_ID(aa64_sve2_pmull128, ARM_HWCAP2_A64_SVEPMULL); 718 GET_FEATURE_ID(aa64_sve2_bitperm, ARM_HWCAP2_A64_SVEBITPERM); 719 GET_FEATURE_ID(aa64_sve2_sha3, ARM_HWCAP2_A64_SVESHA3); 720 GET_FEATURE_ID(aa64_sve2_sm4, ARM_HWCAP2_A64_SVESM4); 721 GET_FEATURE_ID(aa64_condm_5, ARM_HWCAP2_A64_FLAGM2); 722 GET_FEATURE_ID(aa64_frint, ARM_HWCAP2_A64_FRINT); 723 GET_FEATURE_ID(aa64_sve_i8mm, ARM_HWCAP2_A64_SVEI8MM); 724 GET_FEATURE_ID(aa64_sve_f32mm, ARM_HWCAP2_A64_SVEF32MM); 725 GET_FEATURE_ID(aa64_sve_f64mm, ARM_HWCAP2_A64_SVEF64MM); 726 GET_FEATURE_ID(aa64_sve_bf16, ARM_HWCAP2_A64_SVEBF16); 727 GET_FEATURE_ID(aa64_i8mm, ARM_HWCAP2_A64_I8MM); 728 GET_FEATURE_ID(aa64_bf16, ARM_HWCAP2_A64_BF16); 729 GET_FEATURE_ID(aa64_rndr, ARM_HWCAP2_A64_RNG); 730 GET_FEATURE_ID(aa64_bti, ARM_HWCAP2_A64_BTI); 731 GET_FEATURE_ID(aa64_mte, ARM_HWCAP2_A64_MTE); 732 GET_FEATURE_ID(aa64_sme, (ARM_HWCAP2_A64_SME | 733 ARM_HWCAP2_A64_SME_F32F32 | 734 ARM_HWCAP2_A64_SME_B16F32 | 735 ARM_HWCAP2_A64_SME_F16F32 | 736 ARM_HWCAP2_A64_SME_I8I32)); 737 GET_FEATURE_ID(aa64_sme_f64f64, ARM_HWCAP2_A64_SME_F64F64); 738 GET_FEATURE_ID(aa64_sme_i16i64, ARM_HWCAP2_A64_SME_I16I64); 739 GET_FEATURE_ID(aa64_sme_fa64, ARM_HWCAP2_A64_SME_FA64); 740 741 return hwcaps; 742 } 743 744 #undef GET_FEATURE_ID 745 746 #endif /* not TARGET_AARCH64 */ 747 #endif /* TARGET_ARM */ 748 749 #ifdef TARGET_SPARC 750 #ifdef TARGET_SPARC64 751 752 #define ELF_START_MMAP 0x80000000 753 #define ELF_HWCAP (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \ 754 | HWCAP_SPARC_MULDIV | HWCAP_SPARC_V9) 755 #ifndef TARGET_ABI32 756 #define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS ) 757 #else 758 #define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC ) 759 #endif 760 761 #define ELF_CLASS ELFCLASS64 762 #define ELF_ARCH EM_SPARCV9 763 #else 764 #define ELF_START_MMAP 0x80000000 765 #define ELF_HWCAP (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \ 766 | HWCAP_SPARC_MULDIV) 767 #define ELF_CLASS ELFCLASS32 768 #define ELF_ARCH EM_SPARC 769 #endif /* TARGET_SPARC64 */ 770 771 static inline void init_thread(struct target_pt_regs *regs, 772 struct image_info *infop) 773 { 774 /* Note that target_cpu_copy_regs does not read psr/tstate. */ 775 regs->pc = infop->entry; 776 regs->npc = regs->pc + 4; 777 regs->y = 0; 778 regs->u_regs[14] = (infop->start_stack - 16 * sizeof(abi_ulong) 779 - TARGET_STACK_BIAS); 780 } 781 #endif /* TARGET_SPARC */ 782 783 #ifdef TARGET_PPC 784 785 #define ELF_MACHINE PPC_ELF_MACHINE 786 #define ELF_START_MMAP 0x80000000 787 788 #if defined(TARGET_PPC64) 789 790 #define elf_check_arch(x) ( (x) == EM_PPC64 ) 791 792 #define ELF_CLASS ELFCLASS64 793 794 #else 795 796 #define ELF_CLASS ELFCLASS32 797 #define EXSTACK_DEFAULT true 798 799 #endif 800 801 #define ELF_ARCH EM_PPC 802 803 /* Feature masks for the Aux Vector Hardware Capabilities (AT_HWCAP). 804 See arch/powerpc/include/asm/cputable.h. */ 805 enum { 806 QEMU_PPC_FEATURE_32 = 0x80000000, 807 QEMU_PPC_FEATURE_64 = 0x40000000, 808 QEMU_PPC_FEATURE_601_INSTR = 0x20000000, 809 QEMU_PPC_FEATURE_HAS_ALTIVEC = 0x10000000, 810 QEMU_PPC_FEATURE_HAS_FPU = 0x08000000, 811 QEMU_PPC_FEATURE_HAS_MMU = 0x04000000, 812 QEMU_PPC_FEATURE_HAS_4xxMAC = 0x02000000, 813 QEMU_PPC_FEATURE_UNIFIED_CACHE = 0x01000000, 814 QEMU_PPC_FEATURE_HAS_SPE = 0x00800000, 815 QEMU_PPC_FEATURE_HAS_EFP_SINGLE = 0x00400000, 816 QEMU_PPC_FEATURE_HAS_EFP_DOUBLE = 0x00200000, 817 QEMU_PPC_FEATURE_NO_TB = 0x00100000, 818 QEMU_PPC_FEATURE_POWER4 = 0x00080000, 819 QEMU_PPC_FEATURE_POWER5 = 0x00040000, 820 QEMU_PPC_FEATURE_POWER5_PLUS = 0x00020000, 821 QEMU_PPC_FEATURE_CELL = 0x00010000, 822 QEMU_PPC_FEATURE_BOOKE = 0x00008000, 823 QEMU_PPC_FEATURE_SMT = 0x00004000, 824 QEMU_PPC_FEATURE_ICACHE_SNOOP = 0x00002000, 825 QEMU_PPC_FEATURE_ARCH_2_05 = 0x00001000, 826 QEMU_PPC_FEATURE_PA6T = 0x00000800, 827 QEMU_PPC_FEATURE_HAS_DFP = 0x00000400, 828 QEMU_PPC_FEATURE_POWER6_EXT = 0x00000200, 829 QEMU_PPC_FEATURE_ARCH_2_06 = 0x00000100, 830 QEMU_PPC_FEATURE_HAS_VSX = 0x00000080, 831 QEMU_PPC_FEATURE_PSERIES_PERFMON_COMPAT = 0x00000040, 832 833 QEMU_PPC_FEATURE_TRUE_LE = 0x00000002, 834 QEMU_PPC_FEATURE_PPC_LE = 0x00000001, 835 836 /* Feature definitions in AT_HWCAP2. */ 837 QEMU_PPC_FEATURE2_ARCH_2_07 = 0x80000000, /* ISA 2.07 */ 838 QEMU_PPC_FEATURE2_HAS_HTM = 0x40000000, /* Hardware Transactional Memory */ 839 QEMU_PPC_FEATURE2_HAS_DSCR = 0x20000000, /* Data Stream Control Register */ 840 QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */ 841 QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */ 842 QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */ 843 QEMU_PPC_FEATURE2_VEC_CRYPTO = 0x02000000, 844 QEMU_PPC_FEATURE2_HTM_NOSC = 0x01000000, 845 QEMU_PPC_FEATURE2_ARCH_3_00 = 0x00800000, /* ISA 3.00 */ 846 QEMU_PPC_FEATURE2_HAS_IEEE128 = 0x00400000, /* VSX IEEE Bin Float 128-bit */ 847 QEMU_PPC_FEATURE2_DARN = 0x00200000, /* darn random number insn */ 848 QEMU_PPC_FEATURE2_SCV = 0x00100000, /* scv syscall */ 849 QEMU_PPC_FEATURE2_HTM_NO_SUSPEND = 0x00080000, /* TM w/o suspended state */ 850 QEMU_PPC_FEATURE2_ARCH_3_1 = 0x00040000, /* ISA 3.1 */ 851 QEMU_PPC_FEATURE2_MMA = 0x00020000, /* Matrix-Multiply Assist */ 852 }; 853 854 #define ELF_HWCAP get_elf_hwcap() 855 856 static uint32_t get_elf_hwcap(void) 857 { 858 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu); 859 uint32_t features = 0; 860 861 /* We don't have to be terribly complete here; the high points are 862 Altivec/FP/SPE support. Anything else is just a bonus. */ 863 #define GET_FEATURE(flag, feature) \ 864 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0) 865 #define GET_FEATURE2(flags, feature) \ 866 do { \ 867 if ((cpu->env.insns_flags2 & flags) == flags) { \ 868 features |= feature; \ 869 } \ 870 } while (0) 871 GET_FEATURE(PPC_64B, QEMU_PPC_FEATURE_64); 872 GET_FEATURE(PPC_FLOAT, QEMU_PPC_FEATURE_HAS_FPU); 873 GET_FEATURE(PPC_ALTIVEC, QEMU_PPC_FEATURE_HAS_ALTIVEC); 874 GET_FEATURE(PPC_SPE, QEMU_PPC_FEATURE_HAS_SPE); 875 GET_FEATURE(PPC_SPE_SINGLE, QEMU_PPC_FEATURE_HAS_EFP_SINGLE); 876 GET_FEATURE(PPC_SPE_DOUBLE, QEMU_PPC_FEATURE_HAS_EFP_DOUBLE); 877 GET_FEATURE(PPC_BOOKE, QEMU_PPC_FEATURE_BOOKE); 878 GET_FEATURE(PPC_405_MAC, QEMU_PPC_FEATURE_HAS_4xxMAC); 879 GET_FEATURE2(PPC2_DFP, QEMU_PPC_FEATURE_HAS_DFP); 880 GET_FEATURE2(PPC2_VSX, QEMU_PPC_FEATURE_HAS_VSX); 881 GET_FEATURE2((PPC2_PERM_ISA206 | PPC2_DIVE_ISA206 | PPC2_ATOMIC_ISA206 | 882 PPC2_FP_CVT_ISA206 | PPC2_FP_TST_ISA206), 883 QEMU_PPC_FEATURE_ARCH_2_06); 884 #undef GET_FEATURE 885 #undef GET_FEATURE2 886 887 return features; 888 } 889 890 #define ELF_HWCAP2 get_elf_hwcap2() 891 892 static uint32_t get_elf_hwcap2(void) 893 { 894 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu); 895 uint32_t features = 0; 896 897 #define GET_FEATURE(flag, feature) \ 898 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0) 899 #define GET_FEATURE2(flag, feature) \ 900 do { if (cpu->env.insns_flags2 & flag) { features |= feature; } } while (0) 901 902 GET_FEATURE(PPC_ISEL, QEMU_PPC_FEATURE2_HAS_ISEL); 903 GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR); 904 GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 | 905 PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07 | 906 QEMU_PPC_FEATURE2_VEC_CRYPTO); 907 GET_FEATURE2(PPC2_ISA300, QEMU_PPC_FEATURE2_ARCH_3_00 | 908 QEMU_PPC_FEATURE2_DARN | QEMU_PPC_FEATURE2_HAS_IEEE128); 909 GET_FEATURE2(PPC2_ISA310, QEMU_PPC_FEATURE2_ARCH_3_1 | 910 QEMU_PPC_FEATURE2_MMA); 911 912 #undef GET_FEATURE 913 #undef GET_FEATURE2 914 915 return features; 916 } 917 918 /* 919 * The requirements here are: 920 * - keep the final alignment of sp (sp & 0xf) 921 * - make sure the 32-bit value at the first 16 byte aligned position of 922 * AUXV is greater than 16 for glibc compatibility. 923 * AT_IGNOREPPC is used for that. 924 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC, 925 * even if DLINFO_ARCH_ITEMS goes to zero or is undefined. 926 */ 927 #define DLINFO_ARCH_ITEMS 5 928 #define ARCH_DLINFO \ 929 do { \ 930 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu); \ 931 /* \ 932 * Handle glibc compatibility: these magic entries must \ 933 * be at the lowest addresses in the final auxv. \ 934 */ \ 935 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \ 936 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \ 937 NEW_AUX_ENT(AT_DCACHEBSIZE, cpu->env.dcache_line_size); \ 938 NEW_AUX_ENT(AT_ICACHEBSIZE, cpu->env.icache_line_size); \ 939 NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \ 940 } while (0) 941 942 static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop) 943 { 944 _regs->gpr[1] = infop->start_stack; 945 #if defined(TARGET_PPC64) 946 if (get_ppc64_abi(infop) < 2) { 947 uint64_t val; 948 get_user_u64(val, infop->entry + 8); 949 _regs->gpr[2] = val + infop->load_bias; 950 get_user_u64(val, infop->entry); 951 infop->entry = val + infop->load_bias; 952 } else { 953 _regs->gpr[12] = infop->entry; /* r12 set to global entry address */ 954 } 955 #endif 956 _regs->nip = infop->entry; 957 } 958 959 /* See linux kernel: arch/powerpc/include/asm/elf.h. */ 960 #define ELF_NREG 48 961 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 962 963 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUPPCState *env) 964 { 965 int i; 966 target_ulong ccr = 0; 967 968 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) { 969 (*regs)[i] = tswapreg(env->gpr[i]); 970 } 971 972 (*regs)[32] = tswapreg(env->nip); 973 (*regs)[33] = tswapreg(env->msr); 974 (*regs)[35] = tswapreg(env->ctr); 975 (*regs)[36] = tswapreg(env->lr); 976 (*regs)[37] = tswapreg(cpu_read_xer(env)); 977 978 ccr = ppc_get_cr(env); 979 (*regs)[38] = tswapreg(ccr); 980 } 981 982 #define USE_ELF_CORE_DUMP 983 #define ELF_EXEC_PAGESIZE 4096 984 985 #endif 986 987 #ifdef TARGET_LOONGARCH64 988 989 #define ELF_START_MMAP 0x80000000 990 991 #define ELF_CLASS ELFCLASS64 992 #define ELF_ARCH EM_LOONGARCH 993 #define EXSTACK_DEFAULT true 994 995 #define elf_check_arch(x) ((x) == EM_LOONGARCH) 996 997 static inline void init_thread(struct target_pt_regs *regs, 998 struct image_info *infop) 999 { 1000 /*Set crmd PG,DA = 1,0 */ 1001 regs->csr.crmd = 2 << 3; 1002 regs->csr.era = infop->entry; 1003 regs->regs[3] = infop->start_stack; 1004 } 1005 1006 /* See linux kernel: arch/loongarch/include/asm/elf.h */ 1007 #define ELF_NREG 45 1008 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1009 1010 enum { 1011 TARGET_EF_R0 = 0, 1012 TARGET_EF_CSR_ERA = TARGET_EF_R0 + 33, 1013 TARGET_EF_CSR_BADV = TARGET_EF_R0 + 34, 1014 }; 1015 1016 static void elf_core_copy_regs(target_elf_gregset_t *regs, 1017 const CPULoongArchState *env) 1018 { 1019 int i; 1020 1021 (*regs)[TARGET_EF_R0] = 0; 1022 1023 for (i = 1; i < ARRAY_SIZE(env->gpr); i++) { 1024 (*regs)[TARGET_EF_R0 + i] = tswapreg(env->gpr[i]); 1025 } 1026 1027 (*regs)[TARGET_EF_CSR_ERA] = tswapreg(env->pc); 1028 (*regs)[TARGET_EF_CSR_BADV] = tswapreg(env->CSR_BADV); 1029 } 1030 1031 #define USE_ELF_CORE_DUMP 1032 #define ELF_EXEC_PAGESIZE 4096 1033 1034 #define ELF_HWCAP get_elf_hwcap() 1035 1036 /* See arch/loongarch/include/uapi/asm/hwcap.h */ 1037 enum { 1038 HWCAP_LOONGARCH_CPUCFG = (1 << 0), 1039 HWCAP_LOONGARCH_LAM = (1 << 1), 1040 HWCAP_LOONGARCH_UAL = (1 << 2), 1041 HWCAP_LOONGARCH_FPU = (1 << 3), 1042 HWCAP_LOONGARCH_LSX = (1 << 4), 1043 HWCAP_LOONGARCH_LASX = (1 << 5), 1044 HWCAP_LOONGARCH_CRC32 = (1 << 6), 1045 HWCAP_LOONGARCH_COMPLEX = (1 << 7), 1046 HWCAP_LOONGARCH_CRYPTO = (1 << 8), 1047 HWCAP_LOONGARCH_LVZ = (1 << 9), 1048 HWCAP_LOONGARCH_LBT_X86 = (1 << 10), 1049 HWCAP_LOONGARCH_LBT_ARM = (1 << 11), 1050 HWCAP_LOONGARCH_LBT_MIPS = (1 << 12), 1051 }; 1052 1053 static uint32_t get_elf_hwcap(void) 1054 { 1055 LoongArchCPU *cpu = LOONGARCH_CPU(thread_cpu); 1056 uint32_t hwcaps = 0; 1057 1058 hwcaps |= HWCAP_LOONGARCH_CRC32; 1059 1060 if (FIELD_EX32(cpu->env.cpucfg[1], CPUCFG1, UAL)) { 1061 hwcaps |= HWCAP_LOONGARCH_UAL; 1062 } 1063 1064 if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, FP)) { 1065 hwcaps |= HWCAP_LOONGARCH_FPU; 1066 } 1067 1068 if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LAM)) { 1069 hwcaps |= HWCAP_LOONGARCH_LAM; 1070 } 1071 1072 return hwcaps; 1073 } 1074 1075 #define ELF_PLATFORM "loongarch" 1076 1077 #endif /* TARGET_LOONGARCH64 */ 1078 1079 #ifdef TARGET_MIPS 1080 1081 #define ELF_START_MMAP 0x80000000 1082 1083 #ifdef TARGET_MIPS64 1084 #define ELF_CLASS ELFCLASS64 1085 #else 1086 #define ELF_CLASS ELFCLASS32 1087 #endif 1088 #define ELF_ARCH EM_MIPS 1089 #define EXSTACK_DEFAULT true 1090 1091 #ifdef TARGET_ABI_MIPSN32 1092 #define elf_check_abi(x) ((x) & EF_MIPS_ABI2) 1093 #else 1094 #define elf_check_abi(x) (!((x) & EF_MIPS_ABI2)) 1095 #endif 1096 1097 #define ELF_BASE_PLATFORM get_elf_base_platform() 1098 1099 #define MATCH_PLATFORM_INSN(_flags, _base_platform) \ 1100 do { if ((cpu->env.insn_flags & (_flags)) == _flags) \ 1101 { return _base_platform; } } while (0) 1102 1103 static const char *get_elf_base_platform(void) 1104 { 1105 MIPSCPU *cpu = MIPS_CPU(thread_cpu); 1106 1107 /* 64 bit ISAs goes first */ 1108 MATCH_PLATFORM_INSN(CPU_MIPS64R6, "mips64r6"); 1109 MATCH_PLATFORM_INSN(CPU_MIPS64R5, "mips64r5"); 1110 MATCH_PLATFORM_INSN(CPU_MIPS64R2, "mips64r2"); 1111 MATCH_PLATFORM_INSN(CPU_MIPS64R1, "mips64"); 1112 MATCH_PLATFORM_INSN(CPU_MIPS5, "mips5"); 1113 MATCH_PLATFORM_INSN(CPU_MIPS4, "mips4"); 1114 MATCH_PLATFORM_INSN(CPU_MIPS3, "mips3"); 1115 1116 /* 32 bit ISAs */ 1117 MATCH_PLATFORM_INSN(CPU_MIPS32R6, "mips32r6"); 1118 MATCH_PLATFORM_INSN(CPU_MIPS32R5, "mips32r5"); 1119 MATCH_PLATFORM_INSN(CPU_MIPS32R2, "mips32r2"); 1120 MATCH_PLATFORM_INSN(CPU_MIPS32R1, "mips32"); 1121 MATCH_PLATFORM_INSN(CPU_MIPS2, "mips2"); 1122 1123 /* Fallback */ 1124 return "mips"; 1125 } 1126 #undef MATCH_PLATFORM_INSN 1127 1128 static inline void init_thread(struct target_pt_regs *regs, 1129 struct image_info *infop) 1130 { 1131 regs->cp0_status = 2 << CP0St_KSU; 1132 regs->cp0_epc = infop->entry; 1133 regs->regs[29] = infop->start_stack; 1134 } 1135 1136 /* See linux kernel: arch/mips/include/asm/elf.h. */ 1137 #define ELF_NREG 45 1138 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1139 1140 /* See linux kernel: arch/mips/include/asm/reg.h. */ 1141 enum { 1142 #ifdef TARGET_MIPS64 1143 TARGET_EF_R0 = 0, 1144 #else 1145 TARGET_EF_R0 = 6, 1146 #endif 1147 TARGET_EF_R26 = TARGET_EF_R0 + 26, 1148 TARGET_EF_R27 = TARGET_EF_R0 + 27, 1149 TARGET_EF_LO = TARGET_EF_R0 + 32, 1150 TARGET_EF_HI = TARGET_EF_R0 + 33, 1151 TARGET_EF_CP0_EPC = TARGET_EF_R0 + 34, 1152 TARGET_EF_CP0_BADVADDR = TARGET_EF_R0 + 35, 1153 TARGET_EF_CP0_STATUS = TARGET_EF_R0 + 36, 1154 TARGET_EF_CP0_CAUSE = TARGET_EF_R0 + 37 1155 }; 1156 1157 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */ 1158 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMIPSState *env) 1159 { 1160 int i; 1161 1162 for (i = 0; i < TARGET_EF_R0; i++) { 1163 (*regs)[i] = 0; 1164 } 1165 (*regs)[TARGET_EF_R0] = 0; 1166 1167 for (i = 1; i < ARRAY_SIZE(env->active_tc.gpr); i++) { 1168 (*regs)[TARGET_EF_R0 + i] = tswapreg(env->active_tc.gpr[i]); 1169 } 1170 1171 (*regs)[TARGET_EF_R26] = 0; 1172 (*regs)[TARGET_EF_R27] = 0; 1173 (*regs)[TARGET_EF_LO] = tswapreg(env->active_tc.LO[0]); 1174 (*regs)[TARGET_EF_HI] = tswapreg(env->active_tc.HI[0]); 1175 (*regs)[TARGET_EF_CP0_EPC] = tswapreg(env->active_tc.PC); 1176 (*regs)[TARGET_EF_CP0_BADVADDR] = tswapreg(env->CP0_BadVAddr); 1177 (*regs)[TARGET_EF_CP0_STATUS] = tswapreg(env->CP0_Status); 1178 (*regs)[TARGET_EF_CP0_CAUSE] = tswapreg(env->CP0_Cause); 1179 } 1180 1181 #define USE_ELF_CORE_DUMP 1182 #define ELF_EXEC_PAGESIZE 4096 1183 1184 /* See arch/mips/include/uapi/asm/hwcap.h. */ 1185 enum { 1186 HWCAP_MIPS_R6 = (1 << 0), 1187 HWCAP_MIPS_MSA = (1 << 1), 1188 HWCAP_MIPS_CRC32 = (1 << 2), 1189 HWCAP_MIPS_MIPS16 = (1 << 3), 1190 HWCAP_MIPS_MDMX = (1 << 4), 1191 HWCAP_MIPS_MIPS3D = (1 << 5), 1192 HWCAP_MIPS_SMARTMIPS = (1 << 6), 1193 HWCAP_MIPS_DSP = (1 << 7), 1194 HWCAP_MIPS_DSP2 = (1 << 8), 1195 HWCAP_MIPS_DSP3 = (1 << 9), 1196 HWCAP_MIPS_MIPS16E2 = (1 << 10), 1197 HWCAP_LOONGSON_MMI = (1 << 11), 1198 HWCAP_LOONGSON_EXT = (1 << 12), 1199 HWCAP_LOONGSON_EXT2 = (1 << 13), 1200 HWCAP_LOONGSON_CPUCFG = (1 << 14), 1201 }; 1202 1203 #define ELF_HWCAP get_elf_hwcap() 1204 1205 #define GET_FEATURE_INSN(_flag, _hwcap) \ 1206 do { if (cpu->env.insn_flags & (_flag)) { hwcaps |= _hwcap; } } while (0) 1207 1208 #define GET_FEATURE_REG_SET(_reg, _mask, _hwcap) \ 1209 do { if (cpu->env._reg & (_mask)) { hwcaps |= _hwcap; } } while (0) 1210 1211 #define GET_FEATURE_REG_EQU(_reg, _start, _length, _val, _hwcap) \ 1212 do { \ 1213 if (extract32(cpu->env._reg, (_start), (_length)) == (_val)) { \ 1214 hwcaps |= _hwcap; \ 1215 } \ 1216 } while (0) 1217 1218 static uint32_t get_elf_hwcap(void) 1219 { 1220 MIPSCPU *cpu = MIPS_CPU(thread_cpu); 1221 uint32_t hwcaps = 0; 1222 1223 GET_FEATURE_REG_EQU(CP0_Config0, CP0C0_AR, CP0C0_AR_LENGTH, 1224 2, HWCAP_MIPS_R6); 1225 GET_FEATURE_REG_SET(CP0_Config3, 1 << CP0C3_MSAP, HWCAP_MIPS_MSA); 1226 GET_FEATURE_INSN(ASE_LMMI, HWCAP_LOONGSON_MMI); 1227 GET_FEATURE_INSN(ASE_LEXT, HWCAP_LOONGSON_EXT); 1228 1229 return hwcaps; 1230 } 1231 1232 #undef GET_FEATURE_REG_EQU 1233 #undef GET_FEATURE_REG_SET 1234 #undef GET_FEATURE_INSN 1235 1236 #endif /* TARGET_MIPS */ 1237 1238 #ifdef TARGET_MICROBLAZE 1239 1240 #define ELF_START_MMAP 0x80000000 1241 1242 #define elf_check_arch(x) ( (x) == EM_MICROBLAZE || (x) == EM_MICROBLAZE_OLD) 1243 1244 #define ELF_CLASS ELFCLASS32 1245 #define ELF_ARCH EM_MICROBLAZE 1246 1247 static inline void init_thread(struct target_pt_regs *regs, 1248 struct image_info *infop) 1249 { 1250 regs->pc = infop->entry; 1251 regs->r1 = infop->start_stack; 1252 1253 } 1254 1255 #define ELF_EXEC_PAGESIZE 4096 1256 1257 #define USE_ELF_CORE_DUMP 1258 #define ELF_NREG 38 1259 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1260 1261 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */ 1262 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMBState *env) 1263 { 1264 int i, pos = 0; 1265 1266 for (i = 0; i < 32; i++) { 1267 (*regs)[pos++] = tswapreg(env->regs[i]); 1268 } 1269 1270 (*regs)[pos++] = tswapreg(env->pc); 1271 (*regs)[pos++] = tswapreg(mb_cpu_read_msr(env)); 1272 (*regs)[pos++] = 0; 1273 (*regs)[pos++] = tswapreg(env->ear); 1274 (*regs)[pos++] = 0; 1275 (*regs)[pos++] = tswapreg(env->esr); 1276 } 1277 1278 #endif /* TARGET_MICROBLAZE */ 1279 1280 #ifdef TARGET_NIOS2 1281 1282 #define ELF_START_MMAP 0x80000000 1283 1284 #define elf_check_arch(x) ((x) == EM_ALTERA_NIOS2) 1285 1286 #define ELF_CLASS ELFCLASS32 1287 #define ELF_ARCH EM_ALTERA_NIOS2 1288 1289 static void init_thread(struct target_pt_regs *regs, struct image_info *infop) 1290 { 1291 regs->ea = infop->entry; 1292 regs->sp = infop->start_stack; 1293 } 1294 1295 #define LO_COMMPAGE TARGET_PAGE_SIZE 1296 1297 static bool init_guest_commpage(void) 1298 { 1299 static const uint8_t kuser_page[4 + 2 * 64] = { 1300 /* __kuser_helper_version */ 1301 [0x00] = 0x02, 0x00, 0x00, 0x00, 1302 1303 /* __kuser_cmpxchg */ 1304 [0x04] = 0x3a, 0x6c, 0x3b, 0x00, /* trap 16 */ 1305 0x3a, 0x28, 0x00, 0xf8, /* ret */ 1306 1307 /* __kuser_sigtramp */ 1308 [0x44] = 0xc4, 0x22, 0x80, 0x00, /* movi r2, __NR_rt_sigreturn */ 1309 0x3a, 0x68, 0x3b, 0x00, /* trap 0 */ 1310 }; 1311 1312 void *want = g2h_untagged(LO_COMMPAGE & -qemu_host_page_size); 1313 void *addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE, 1314 MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0); 1315 1316 if (addr == MAP_FAILED) { 1317 perror("Allocating guest commpage"); 1318 exit(EXIT_FAILURE); 1319 } 1320 if (addr != want) { 1321 return false; 1322 } 1323 1324 memcpy(addr, kuser_page, sizeof(kuser_page)); 1325 1326 if (mprotect(addr, qemu_host_page_size, PROT_READ)) { 1327 perror("Protecting guest commpage"); 1328 exit(EXIT_FAILURE); 1329 } 1330 1331 page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK, 1332 PAGE_READ | PAGE_EXEC | PAGE_VALID); 1333 return true; 1334 } 1335 1336 #define ELF_EXEC_PAGESIZE 4096 1337 1338 #define USE_ELF_CORE_DUMP 1339 #define ELF_NREG 49 1340 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1341 1342 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */ 1343 static void elf_core_copy_regs(target_elf_gregset_t *regs, 1344 const CPUNios2State *env) 1345 { 1346 int i; 1347 1348 (*regs)[0] = -1; 1349 for (i = 1; i < 8; i++) /* r0-r7 */ 1350 (*regs)[i] = tswapreg(env->regs[i + 7]); 1351 1352 for (i = 8; i < 16; i++) /* r8-r15 */ 1353 (*regs)[i] = tswapreg(env->regs[i - 8]); 1354 1355 for (i = 16; i < 24; i++) /* r16-r23 */ 1356 (*regs)[i] = tswapreg(env->regs[i + 7]); 1357 (*regs)[24] = -1; /* R_ET */ 1358 (*regs)[25] = -1; /* R_BT */ 1359 (*regs)[26] = tswapreg(env->regs[R_GP]); 1360 (*regs)[27] = tswapreg(env->regs[R_SP]); 1361 (*regs)[28] = tswapreg(env->regs[R_FP]); 1362 (*regs)[29] = tswapreg(env->regs[R_EA]); 1363 (*regs)[30] = -1; /* R_SSTATUS */ 1364 (*regs)[31] = tswapreg(env->regs[R_RA]); 1365 1366 (*regs)[32] = tswapreg(env->pc); 1367 1368 (*regs)[33] = -1; /* R_STATUS */ 1369 (*regs)[34] = tswapreg(env->regs[CR_ESTATUS]); 1370 1371 for (i = 35; i < 49; i++) /* ... */ 1372 (*regs)[i] = -1; 1373 } 1374 1375 #endif /* TARGET_NIOS2 */ 1376 1377 #ifdef TARGET_OPENRISC 1378 1379 #define ELF_START_MMAP 0x08000000 1380 1381 #define ELF_ARCH EM_OPENRISC 1382 #define ELF_CLASS ELFCLASS32 1383 #define ELF_DATA ELFDATA2MSB 1384 1385 static inline void init_thread(struct target_pt_regs *regs, 1386 struct image_info *infop) 1387 { 1388 regs->pc = infop->entry; 1389 regs->gpr[1] = infop->start_stack; 1390 } 1391 1392 #define USE_ELF_CORE_DUMP 1393 #define ELF_EXEC_PAGESIZE 8192 1394 1395 /* See linux kernel arch/openrisc/include/asm/elf.h. */ 1396 #define ELF_NREG 34 /* gprs and pc, sr */ 1397 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1398 1399 static void elf_core_copy_regs(target_elf_gregset_t *regs, 1400 const CPUOpenRISCState *env) 1401 { 1402 int i; 1403 1404 for (i = 0; i < 32; i++) { 1405 (*regs)[i] = tswapreg(cpu_get_gpr(env, i)); 1406 } 1407 (*regs)[32] = tswapreg(env->pc); 1408 (*regs)[33] = tswapreg(cpu_get_sr(env)); 1409 } 1410 #define ELF_HWCAP 0 1411 #define ELF_PLATFORM NULL 1412 1413 #endif /* TARGET_OPENRISC */ 1414 1415 #ifdef TARGET_SH4 1416 1417 #define ELF_START_MMAP 0x80000000 1418 1419 #define ELF_CLASS ELFCLASS32 1420 #define ELF_ARCH EM_SH 1421 1422 static inline void init_thread(struct target_pt_regs *regs, 1423 struct image_info *infop) 1424 { 1425 /* Check other registers XXXXX */ 1426 regs->pc = infop->entry; 1427 regs->regs[15] = infop->start_stack; 1428 } 1429 1430 /* See linux kernel: arch/sh/include/asm/elf.h. */ 1431 #define ELF_NREG 23 1432 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1433 1434 /* See linux kernel: arch/sh/include/asm/ptrace.h. */ 1435 enum { 1436 TARGET_REG_PC = 16, 1437 TARGET_REG_PR = 17, 1438 TARGET_REG_SR = 18, 1439 TARGET_REG_GBR = 19, 1440 TARGET_REG_MACH = 20, 1441 TARGET_REG_MACL = 21, 1442 TARGET_REG_SYSCALL = 22 1443 }; 1444 1445 static inline void elf_core_copy_regs(target_elf_gregset_t *regs, 1446 const CPUSH4State *env) 1447 { 1448 int i; 1449 1450 for (i = 0; i < 16; i++) { 1451 (*regs)[i] = tswapreg(env->gregs[i]); 1452 } 1453 1454 (*regs)[TARGET_REG_PC] = tswapreg(env->pc); 1455 (*regs)[TARGET_REG_PR] = tswapreg(env->pr); 1456 (*regs)[TARGET_REG_SR] = tswapreg(env->sr); 1457 (*regs)[TARGET_REG_GBR] = tswapreg(env->gbr); 1458 (*regs)[TARGET_REG_MACH] = tswapreg(env->mach); 1459 (*regs)[TARGET_REG_MACL] = tswapreg(env->macl); 1460 (*regs)[TARGET_REG_SYSCALL] = 0; /* FIXME */ 1461 } 1462 1463 #define USE_ELF_CORE_DUMP 1464 #define ELF_EXEC_PAGESIZE 4096 1465 1466 enum { 1467 SH_CPU_HAS_FPU = 0x0001, /* Hardware FPU support */ 1468 SH_CPU_HAS_P2_FLUSH_BUG = 0x0002, /* Need to flush the cache in P2 area */ 1469 SH_CPU_HAS_MMU_PAGE_ASSOC = 0x0004, /* SH3: TLB way selection bit support */ 1470 SH_CPU_HAS_DSP = 0x0008, /* SH-DSP: DSP support */ 1471 SH_CPU_HAS_PERF_COUNTER = 0x0010, /* Hardware performance counters */ 1472 SH_CPU_HAS_PTEA = 0x0020, /* PTEA register */ 1473 SH_CPU_HAS_LLSC = 0x0040, /* movli.l/movco.l */ 1474 SH_CPU_HAS_L2_CACHE = 0x0080, /* Secondary cache / URAM */ 1475 SH_CPU_HAS_OP32 = 0x0100, /* 32-bit instruction support */ 1476 SH_CPU_HAS_PTEAEX = 0x0200, /* PTE ASID Extension support */ 1477 }; 1478 1479 #define ELF_HWCAP get_elf_hwcap() 1480 1481 static uint32_t get_elf_hwcap(void) 1482 { 1483 SuperHCPU *cpu = SUPERH_CPU(thread_cpu); 1484 uint32_t hwcap = 0; 1485 1486 hwcap |= SH_CPU_HAS_FPU; 1487 1488 if (cpu->env.features & SH_FEATURE_SH4A) { 1489 hwcap |= SH_CPU_HAS_LLSC; 1490 } 1491 1492 return hwcap; 1493 } 1494 1495 #endif 1496 1497 #ifdef TARGET_CRIS 1498 1499 #define ELF_START_MMAP 0x80000000 1500 1501 #define ELF_CLASS ELFCLASS32 1502 #define ELF_ARCH EM_CRIS 1503 1504 static inline void init_thread(struct target_pt_regs *regs, 1505 struct image_info *infop) 1506 { 1507 regs->erp = infop->entry; 1508 } 1509 1510 #define ELF_EXEC_PAGESIZE 8192 1511 1512 #endif 1513 1514 #ifdef TARGET_M68K 1515 1516 #define ELF_START_MMAP 0x80000000 1517 1518 #define ELF_CLASS ELFCLASS32 1519 #define ELF_ARCH EM_68K 1520 1521 /* ??? Does this need to do anything? 1522 #define ELF_PLAT_INIT(_r) */ 1523 1524 static inline void init_thread(struct target_pt_regs *regs, 1525 struct image_info *infop) 1526 { 1527 regs->usp = infop->start_stack; 1528 regs->sr = 0; 1529 regs->pc = infop->entry; 1530 } 1531 1532 /* See linux kernel: arch/m68k/include/asm/elf.h. */ 1533 #define ELF_NREG 20 1534 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1535 1536 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUM68KState *env) 1537 { 1538 (*regs)[0] = tswapreg(env->dregs[1]); 1539 (*regs)[1] = tswapreg(env->dregs[2]); 1540 (*regs)[2] = tswapreg(env->dregs[3]); 1541 (*regs)[3] = tswapreg(env->dregs[4]); 1542 (*regs)[4] = tswapreg(env->dregs[5]); 1543 (*regs)[5] = tswapreg(env->dregs[6]); 1544 (*regs)[6] = tswapreg(env->dregs[7]); 1545 (*regs)[7] = tswapreg(env->aregs[0]); 1546 (*regs)[8] = tswapreg(env->aregs[1]); 1547 (*regs)[9] = tswapreg(env->aregs[2]); 1548 (*regs)[10] = tswapreg(env->aregs[3]); 1549 (*regs)[11] = tswapreg(env->aregs[4]); 1550 (*regs)[12] = tswapreg(env->aregs[5]); 1551 (*regs)[13] = tswapreg(env->aregs[6]); 1552 (*regs)[14] = tswapreg(env->dregs[0]); 1553 (*regs)[15] = tswapreg(env->aregs[7]); 1554 (*regs)[16] = tswapreg(env->dregs[0]); /* FIXME: orig_d0 */ 1555 (*regs)[17] = tswapreg(env->sr); 1556 (*regs)[18] = tswapreg(env->pc); 1557 (*regs)[19] = 0; /* FIXME: regs->format | regs->vector */ 1558 } 1559 1560 #define USE_ELF_CORE_DUMP 1561 #define ELF_EXEC_PAGESIZE 8192 1562 1563 #endif 1564 1565 #ifdef TARGET_ALPHA 1566 1567 #define ELF_START_MMAP (0x30000000000ULL) 1568 1569 #define ELF_CLASS ELFCLASS64 1570 #define ELF_ARCH EM_ALPHA 1571 1572 static inline void init_thread(struct target_pt_regs *regs, 1573 struct image_info *infop) 1574 { 1575 regs->pc = infop->entry; 1576 regs->ps = 8; 1577 regs->usp = infop->start_stack; 1578 } 1579 1580 #define ELF_EXEC_PAGESIZE 8192 1581 1582 #endif /* TARGET_ALPHA */ 1583 1584 #ifdef TARGET_S390X 1585 1586 #define ELF_START_MMAP (0x20000000000ULL) 1587 1588 #define ELF_CLASS ELFCLASS64 1589 #define ELF_DATA ELFDATA2MSB 1590 #define ELF_ARCH EM_S390 1591 1592 #include "elf.h" 1593 1594 #define ELF_HWCAP get_elf_hwcap() 1595 1596 #define GET_FEATURE(_feat, _hwcap) \ 1597 do { if (s390_has_feat(_feat)) { hwcap |= _hwcap; } } while (0) 1598 1599 uint32_t get_elf_hwcap(void) 1600 { 1601 /* 1602 * Let's assume we always have esan3 and zarch. 1603 * 31-bit processes can use 64-bit registers (high gprs). 1604 */ 1605 uint32_t hwcap = HWCAP_S390_ESAN3 | HWCAP_S390_ZARCH | HWCAP_S390_HIGH_GPRS; 1606 1607 GET_FEATURE(S390_FEAT_STFLE, HWCAP_S390_STFLE); 1608 GET_FEATURE(S390_FEAT_MSA, HWCAP_S390_MSA); 1609 GET_FEATURE(S390_FEAT_LONG_DISPLACEMENT, HWCAP_S390_LDISP); 1610 GET_FEATURE(S390_FEAT_EXTENDED_IMMEDIATE, HWCAP_S390_EIMM); 1611 if (s390_has_feat(S390_FEAT_EXTENDED_TRANSLATION_3) && 1612 s390_has_feat(S390_FEAT_ETF3_ENH)) { 1613 hwcap |= HWCAP_S390_ETF3EH; 1614 } 1615 GET_FEATURE(S390_FEAT_VECTOR, HWCAP_S390_VXRS); 1616 GET_FEATURE(S390_FEAT_VECTOR_ENH, HWCAP_S390_VXRS_EXT); 1617 1618 return hwcap; 1619 } 1620 1621 const char *elf_hwcap_str(uint32_t bit) 1622 { 1623 static const char *hwcap_str[] = { 1624 [HWCAP_S390_NR_ESAN3] = "esan3", 1625 [HWCAP_S390_NR_ZARCH] = "zarch", 1626 [HWCAP_S390_NR_STFLE] = "stfle", 1627 [HWCAP_S390_NR_MSA] = "msa", 1628 [HWCAP_S390_NR_LDISP] = "ldisp", 1629 [HWCAP_S390_NR_EIMM] = "eimm", 1630 [HWCAP_S390_NR_DFP] = "dfp", 1631 [HWCAP_S390_NR_HPAGE] = "edat", 1632 [HWCAP_S390_NR_ETF3EH] = "etf3eh", 1633 [HWCAP_S390_NR_HIGH_GPRS] = "highgprs", 1634 [HWCAP_S390_NR_TE] = "te", 1635 [HWCAP_S390_NR_VXRS] = "vx", 1636 [HWCAP_S390_NR_VXRS_BCD] = "vxd", 1637 [HWCAP_S390_NR_VXRS_EXT] = "vxe", 1638 [HWCAP_S390_NR_GS] = "gs", 1639 [HWCAP_S390_NR_VXRS_EXT2] = "vxe2", 1640 [HWCAP_S390_NR_VXRS_PDE] = "vxp", 1641 [HWCAP_S390_NR_SORT] = "sort", 1642 [HWCAP_S390_NR_DFLT] = "dflt", 1643 [HWCAP_S390_NR_NNPA] = "nnpa", 1644 [HWCAP_S390_NR_PCI_MIO] = "pcimio", 1645 [HWCAP_S390_NR_SIE] = "sie", 1646 }; 1647 1648 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL; 1649 } 1650 1651 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) 1652 { 1653 regs->psw.addr = infop->entry; 1654 regs->psw.mask = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \ 1655 PSW_MASK_MCHECK | PSW_MASK_PSTATE | PSW_MASK_64 | \ 1656 PSW_MASK_32; 1657 regs->gprs[15] = infop->start_stack; 1658 } 1659 1660 /* See linux kernel: arch/s390/include/uapi/asm/ptrace.h (s390_regs). */ 1661 #define ELF_NREG 27 1662 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1663 1664 enum { 1665 TARGET_REG_PSWM = 0, 1666 TARGET_REG_PSWA = 1, 1667 TARGET_REG_GPRS = 2, 1668 TARGET_REG_ARS = 18, 1669 TARGET_REG_ORIG_R2 = 26, 1670 }; 1671 1672 static void elf_core_copy_regs(target_elf_gregset_t *regs, 1673 const CPUS390XState *env) 1674 { 1675 int i; 1676 uint32_t *aregs; 1677 1678 (*regs)[TARGET_REG_PSWM] = tswapreg(env->psw.mask); 1679 (*regs)[TARGET_REG_PSWA] = tswapreg(env->psw.addr); 1680 for (i = 0; i < 16; i++) { 1681 (*regs)[TARGET_REG_GPRS + i] = tswapreg(env->regs[i]); 1682 } 1683 aregs = (uint32_t *)&((*regs)[TARGET_REG_ARS]); 1684 for (i = 0; i < 16; i++) { 1685 aregs[i] = tswap32(env->aregs[i]); 1686 } 1687 (*regs)[TARGET_REG_ORIG_R2] = 0; 1688 } 1689 1690 #define USE_ELF_CORE_DUMP 1691 #define ELF_EXEC_PAGESIZE 4096 1692 1693 #endif /* TARGET_S390X */ 1694 1695 #ifdef TARGET_RISCV 1696 1697 #define ELF_START_MMAP 0x80000000 1698 #define ELF_ARCH EM_RISCV 1699 1700 #ifdef TARGET_RISCV32 1701 #define ELF_CLASS ELFCLASS32 1702 #else 1703 #define ELF_CLASS ELFCLASS64 1704 #endif 1705 1706 #define ELF_HWCAP get_elf_hwcap() 1707 1708 static uint32_t get_elf_hwcap(void) 1709 { 1710 #define MISA_BIT(EXT) (1 << (EXT - 'A')) 1711 RISCVCPU *cpu = RISCV_CPU(thread_cpu); 1712 uint32_t mask = MISA_BIT('I') | MISA_BIT('M') | MISA_BIT('A') 1713 | MISA_BIT('F') | MISA_BIT('D') | MISA_BIT('C') 1714 | MISA_BIT('V'); 1715 1716 return cpu->env.misa_ext & mask; 1717 #undef MISA_BIT 1718 } 1719 1720 static inline void init_thread(struct target_pt_regs *regs, 1721 struct image_info *infop) 1722 { 1723 regs->sepc = infop->entry; 1724 regs->sp = infop->start_stack; 1725 } 1726 1727 #define ELF_EXEC_PAGESIZE 4096 1728 1729 #endif /* TARGET_RISCV */ 1730 1731 #ifdef TARGET_HPPA 1732 1733 #define ELF_START_MMAP 0x80000000 1734 #define ELF_CLASS ELFCLASS32 1735 #define ELF_ARCH EM_PARISC 1736 #define ELF_PLATFORM "PARISC" 1737 #define STACK_GROWS_DOWN 0 1738 #define STACK_ALIGNMENT 64 1739 1740 static inline void init_thread(struct target_pt_regs *regs, 1741 struct image_info *infop) 1742 { 1743 regs->iaoq[0] = infop->entry; 1744 regs->iaoq[1] = infop->entry + 4; 1745 regs->gr[23] = 0; 1746 regs->gr[24] = infop->argv; 1747 regs->gr[25] = infop->argc; 1748 /* The top-of-stack contains a linkage buffer. */ 1749 regs->gr[30] = infop->start_stack + 64; 1750 regs->gr[31] = infop->entry; 1751 } 1752 1753 #define LO_COMMPAGE 0 1754 1755 static bool init_guest_commpage(void) 1756 { 1757 void *want = g2h_untagged(LO_COMMPAGE); 1758 void *addr = mmap(want, qemu_host_page_size, PROT_NONE, 1759 MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0); 1760 1761 if (addr == MAP_FAILED) { 1762 perror("Allocating guest commpage"); 1763 exit(EXIT_FAILURE); 1764 } 1765 if (addr != want) { 1766 return false; 1767 } 1768 1769 /* 1770 * On Linux, page zero is normally marked execute only + gateway. 1771 * Normal read or write is supposed to fail (thus PROT_NONE above), 1772 * but specific offsets have kernel code mapped to raise permissions 1773 * and implement syscalls. Here, simply mark the page executable. 1774 * Special case the entry points during translation (see do_page_zero). 1775 */ 1776 page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK, 1777 PAGE_EXEC | PAGE_VALID); 1778 return true; 1779 } 1780 1781 #endif /* TARGET_HPPA */ 1782 1783 #ifdef TARGET_XTENSA 1784 1785 #define ELF_START_MMAP 0x20000000 1786 1787 #define ELF_CLASS ELFCLASS32 1788 #define ELF_ARCH EM_XTENSA 1789 1790 static inline void init_thread(struct target_pt_regs *regs, 1791 struct image_info *infop) 1792 { 1793 regs->windowbase = 0; 1794 regs->windowstart = 1; 1795 regs->areg[1] = infop->start_stack; 1796 regs->pc = infop->entry; 1797 if (info_is_fdpic(infop)) { 1798 regs->areg[4] = infop->loadmap_addr; 1799 regs->areg[5] = infop->interpreter_loadmap_addr; 1800 if (infop->interpreter_loadmap_addr) { 1801 regs->areg[6] = infop->interpreter_pt_dynamic_addr; 1802 } else { 1803 regs->areg[6] = infop->pt_dynamic_addr; 1804 } 1805 } 1806 } 1807 1808 /* See linux kernel: arch/xtensa/include/asm/elf.h. */ 1809 #define ELF_NREG 128 1810 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1811 1812 enum { 1813 TARGET_REG_PC, 1814 TARGET_REG_PS, 1815 TARGET_REG_LBEG, 1816 TARGET_REG_LEND, 1817 TARGET_REG_LCOUNT, 1818 TARGET_REG_SAR, 1819 TARGET_REG_WINDOWSTART, 1820 TARGET_REG_WINDOWBASE, 1821 TARGET_REG_THREADPTR, 1822 TARGET_REG_AR0 = 64, 1823 }; 1824 1825 static void elf_core_copy_regs(target_elf_gregset_t *regs, 1826 const CPUXtensaState *env) 1827 { 1828 unsigned i; 1829 1830 (*regs)[TARGET_REG_PC] = tswapreg(env->pc); 1831 (*regs)[TARGET_REG_PS] = tswapreg(env->sregs[PS] & ~PS_EXCM); 1832 (*regs)[TARGET_REG_LBEG] = tswapreg(env->sregs[LBEG]); 1833 (*regs)[TARGET_REG_LEND] = tswapreg(env->sregs[LEND]); 1834 (*regs)[TARGET_REG_LCOUNT] = tswapreg(env->sregs[LCOUNT]); 1835 (*regs)[TARGET_REG_SAR] = tswapreg(env->sregs[SAR]); 1836 (*regs)[TARGET_REG_WINDOWSTART] = tswapreg(env->sregs[WINDOW_START]); 1837 (*regs)[TARGET_REG_WINDOWBASE] = tswapreg(env->sregs[WINDOW_BASE]); 1838 (*regs)[TARGET_REG_THREADPTR] = tswapreg(env->uregs[THREADPTR]); 1839 xtensa_sync_phys_from_window((CPUXtensaState *)env); 1840 for (i = 0; i < env->config->nareg; ++i) { 1841 (*regs)[TARGET_REG_AR0 + i] = tswapreg(env->phys_regs[i]); 1842 } 1843 } 1844 1845 #define USE_ELF_CORE_DUMP 1846 #define ELF_EXEC_PAGESIZE 4096 1847 1848 #endif /* TARGET_XTENSA */ 1849 1850 #ifdef TARGET_HEXAGON 1851 1852 #define ELF_START_MMAP 0x20000000 1853 1854 #define ELF_CLASS ELFCLASS32 1855 #define ELF_ARCH EM_HEXAGON 1856 1857 static inline void init_thread(struct target_pt_regs *regs, 1858 struct image_info *infop) 1859 { 1860 regs->sepc = infop->entry; 1861 regs->sp = infop->start_stack; 1862 } 1863 1864 #endif /* TARGET_HEXAGON */ 1865 1866 #ifndef ELF_BASE_PLATFORM 1867 #define ELF_BASE_PLATFORM (NULL) 1868 #endif 1869 1870 #ifndef ELF_PLATFORM 1871 #define ELF_PLATFORM (NULL) 1872 #endif 1873 1874 #ifndef ELF_MACHINE 1875 #define ELF_MACHINE ELF_ARCH 1876 #endif 1877 1878 #ifndef elf_check_arch 1879 #define elf_check_arch(x) ((x) == ELF_ARCH) 1880 #endif 1881 1882 #ifndef elf_check_abi 1883 #define elf_check_abi(x) (1) 1884 #endif 1885 1886 #ifndef ELF_HWCAP 1887 #define ELF_HWCAP 0 1888 #endif 1889 1890 #ifndef STACK_GROWS_DOWN 1891 #define STACK_GROWS_DOWN 1 1892 #endif 1893 1894 #ifndef STACK_ALIGNMENT 1895 #define STACK_ALIGNMENT 16 1896 #endif 1897 1898 #ifdef TARGET_ABI32 1899 #undef ELF_CLASS 1900 #define ELF_CLASS ELFCLASS32 1901 #undef bswaptls 1902 #define bswaptls(ptr) bswap32s(ptr) 1903 #endif 1904 1905 #ifndef EXSTACK_DEFAULT 1906 #define EXSTACK_DEFAULT false 1907 #endif 1908 1909 #include "elf.h" 1910 1911 /* We must delay the following stanzas until after "elf.h". */ 1912 #if defined(TARGET_AARCH64) 1913 1914 static bool arch_parse_elf_property(uint32_t pr_type, uint32_t pr_datasz, 1915 const uint32_t *data, 1916 struct image_info *info, 1917 Error **errp) 1918 { 1919 if (pr_type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) { 1920 if (pr_datasz != sizeof(uint32_t)) { 1921 error_setg(errp, "Ill-formed GNU_PROPERTY_AARCH64_FEATURE_1_AND"); 1922 return false; 1923 } 1924 /* We will extract GNU_PROPERTY_AARCH64_FEATURE_1_BTI later. */ 1925 info->note_flags = *data; 1926 } 1927 return true; 1928 } 1929 #define ARCH_USE_GNU_PROPERTY 1 1930 1931 #else 1932 1933 static bool arch_parse_elf_property(uint32_t pr_type, uint32_t pr_datasz, 1934 const uint32_t *data, 1935 struct image_info *info, 1936 Error **errp) 1937 { 1938 g_assert_not_reached(); 1939 } 1940 #define ARCH_USE_GNU_PROPERTY 0 1941 1942 #endif 1943 1944 struct exec 1945 { 1946 unsigned int a_info; /* Use macros N_MAGIC, etc for access */ 1947 unsigned int a_text; /* length of text, in bytes */ 1948 unsigned int a_data; /* length of data, in bytes */ 1949 unsigned int a_bss; /* length of uninitialized data area, in bytes */ 1950 unsigned int a_syms; /* length of symbol table data in file, in bytes */ 1951 unsigned int a_entry; /* start address */ 1952 unsigned int a_trsize; /* length of relocation info for text, in bytes */ 1953 unsigned int a_drsize; /* length of relocation info for data, in bytes */ 1954 }; 1955 1956 1957 #define N_MAGIC(exec) ((exec).a_info & 0xffff) 1958 #define OMAGIC 0407 1959 #define NMAGIC 0410 1960 #define ZMAGIC 0413 1961 #define QMAGIC 0314 1962 1963 #define DLINFO_ITEMS 16 1964 1965 static inline void memcpy_fromfs(void * to, const void * from, unsigned long n) 1966 { 1967 memcpy(to, from, n); 1968 } 1969 1970 #ifdef BSWAP_NEEDED 1971 static void bswap_ehdr(struct elfhdr *ehdr) 1972 { 1973 bswap16s(&ehdr->e_type); /* Object file type */ 1974 bswap16s(&ehdr->e_machine); /* Architecture */ 1975 bswap32s(&ehdr->e_version); /* Object file version */ 1976 bswaptls(&ehdr->e_entry); /* Entry point virtual address */ 1977 bswaptls(&ehdr->e_phoff); /* Program header table file offset */ 1978 bswaptls(&ehdr->e_shoff); /* Section header table file offset */ 1979 bswap32s(&ehdr->e_flags); /* Processor-specific flags */ 1980 bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */ 1981 bswap16s(&ehdr->e_phentsize); /* Program header table entry size */ 1982 bswap16s(&ehdr->e_phnum); /* Program header table entry count */ 1983 bswap16s(&ehdr->e_shentsize); /* Section header table entry size */ 1984 bswap16s(&ehdr->e_shnum); /* Section header table entry count */ 1985 bswap16s(&ehdr->e_shstrndx); /* Section header string table index */ 1986 } 1987 1988 static void bswap_phdr(struct elf_phdr *phdr, int phnum) 1989 { 1990 int i; 1991 for (i = 0; i < phnum; ++i, ++phdr) { 1992 bswap32s(&phdr->p_type); /* Segment type */ 1993 bswap32s(&phdr->p_flags); /* Segment flags */ 1994 bswaptls(&phdr->p_offset); /* Segment file offset */ 1995 bswaptls(&phdr->p_vaddr); /* Segment virtual address */ 1996 bswaptls(&phdr->p_paddr); /* Segment physical address */ 1997 bswaptls(&phdr->p_filesz); /* Segment size in file */ 1998 bswaptls(&phdr->p_memsz); /* Segment size in memory */ 1999 bswaptls(&phdr->p_align); /* Segment alignment */ 2000 } 2001 } 2002 2003 static void bswap_shdr(struct elf_shdr *shdr, int shnum) 2004 { 2005 int i; 2006 for (i = 0; i < shnum; ++i, ++shdr) { 2007 bswap32s(&shdr->sh_name); 2008 bswap32s(&shdr->sh_type); 2009 bswaptls(&shdr->sh_flags); 2010 bswaptls(&shdr->sh_addr); 2011 bswaptls(&shdr->sh_offset); 2012 bswaptls(&shdr->sh_size); 2013 bswap32s(&shdr->sh_link); 2014 bswap32s(&shdr->sh_info); 2015 bswaptls(&shdr->sh_addralign); 2016 bswaptls(&shdr->sh_entsize); 2017 } 2018 } 2019 2020 static void bswap_sym(struct elf_sym *sym) 2021 { 2022 bswap32s(&sym->st_name); 2023 bswaptls(&sym->st_value); 2024 bswaptls(&sym->st_size); 2025 bswap16s(&sym->st_shndx); 2026 } 2027 2028 #ifdef TARGET_MIPS 2029 static void bswap_mips_abiflags(Mips_elf_abiflags_v0 *abiflags) 2030 { 2031 bswap16s(&abiflags->version); 2032 bswap32s(&abiflags->ases); 2033 bswap32s(&abiflags->isa_ext); 2034 bswap32s(&abiflags->flags1); 2035 bswap32s(&abiflags->flags2); 2036 } 2037 #endif 2038 #else 2039 static inline void bswap_ehdr(struct elfhdr *ehdr) { } 2040 static inline void bswap_phdr(struct elf_phdr *phdr, int phnum) { } 2041 static inline void bswap_shdr(struct elf_shdr *shdr, int shnum) { } 2042 static inline void bswap_sym(struct elf_sym *sym) { } 2043 #ifdef TARGET_MIPS 2044 static inline void bswap_mips_abiflags(Mips_elf_abiflags_v0 *abiflags) { } 2045 #endif 2046 #endif 2047 2048 #ifdef USE_ELF_CORE_DUMP 2049 static int elf_core_dump(int, const CPUArchState *); 2050 #endif /* USE_ELF_CORE_DUMP */ 2051 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias); 2052 2053 /* Verify the portions of EHDR within E_IDENT for the target. 2054 This can be performed before bswapping the entire header. */ 2055 static bool elf_check_ident(struct elfhdr *ehdr) 2056 { 2057 return (ehdr->e_ident[EI_MAG0] == ELFMAG0 2058 && ehdr->e_ident[EI_MAG1] == ELFMAG1 2059 && ehdr->e_ident[EI_MAG2] == ELFMAG2 2060 && ehdr->e_ident[EI_MAG3] == ELFMAG3 2061 && ehdr->e_ident[EI_CLASS] == ELF_CLASS 2062 && ehdr->e_ident[EI_DATA] == ELF_DATA 2063 && ehdr->e_ident[EI_VERSION] == EV_CURRENT); 2064 } 2065 2066 /* Verify the portions of EHDR outside of E_IDENT for the target. 2067 This has to wait until after bswapping the header. */ 2068 static bool elf_check_ehdr(struct elfhdr *ehdr) 2069 { 2070 return (elf_check_arch(ehdr->e_machine) 2071 && elf_check_abi(ehdr->e_flags) 2072 && ehdr->e_ehsize == sizeof(struct elfhdr) 2073 && ehdr->e_phentsize == sizeof(struct elf_phdr) 2074 && (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN)); 2075 } 2076 2077 /* 2078 * 'copy_elf_strings()' copies argument/envelope strings from user 2079 * memory to free pages in kernel mem. These are in a format ready 2080 * to be put directly into the top of new user memory. 2081 * 2082 */ 2083 static abi_ulong copy_elf_strings(int argc, char **argv, char *scratch, 2084 abi_ulong p, abi_ulong stack_limit) 2085 { 2086 char *tmp; 2087 int len, i; 2088 abi_ulong top = p; 2089 2090 if (!p) { 2091 return 0; /* bullet-proofing */ 2092 } 2093 2094 if (STACK_GROWS_DOWN) { 2095 int offset = ((p - 1) % TARGET_PAGE_SIZE) + 1; 2096 for (i = argc - 1; i >= 0; --i) { 2097 tmp = argv[i]; 2098 if (!tmp) { 2099 fprintf(stderr, "VFS: argc is wrong"); 2100 exit(-1); 2101 } 2102 len = strlen(tmp) + 1; 2103 tmp += len; 2104 2105 if (len > (p - stack_limit)) { 2106 return 0; 2107 } 2108 while (len) { 2109 int bytes_to_copy = (len > offset) ? offset : len; 2110 tmp -= bytes_to_copy; 2111 p -= bytes_to_copy; 2112 offset -= bytes_to_copy; 2113 len -= bytes_to_copy; 2114 2115 memcpy_fromfs(scratch + offset, tmp, bytes_to_copy); 2116 2117 if (offset == 0) { 2118 memcpy_to_target(p, scratch, top - p); 2119 top = p; 2120 offset = TARGET_PAGE_SIZE; 2121 } 2122 } 2123 } 2124 if (p != top) { 2125 memcpy_to_target(p, scratch + offset, top - p); 2126 } 2127 } else { 2128 int remaining = TARGET_PAGE_SIZE - (p % TARGET_PAGE_SIZE); 2129 for (i = 0; i < argc; ++i) { 2130 tmp = argv[i]; 2131 if (!tmp) { 2132 fprintf(stderr, "VFS: argc is wrong"); 2133 exit(-1); 2134 } 2135 len = strlen(tmp) + 1; 2136 if (len > (stack_limit - p)) { 2137 return 0; 2138 } 2139 while (len) { 2140 int bytes_to_copy = (len > remaining) ? remaining : len; 2141 2142 memcpy_fromfs(scratch + (p - top), tmp, bytes_to_copy); 2143 2144 tmp += bytes_to_copy; 2145 remaining -= bytes_to_copy; 2146 p += bytes_to_copy; 2147 len -= bytes_to_copy; 2148 2149 if (remaining == 0) { 2150 memcpy_to_target(top, scratch, p - top); 2151 top = p; 2152 remaining = TARGET_PAGE_SIZE; 2153 } 2154 } 2155 } 2156 if (p != top) { 2157 memcpy_to_target(top, scratch, p - top); 2158 } 2159 } 2160 2161 return p; 2162 } 2163 2164 /* Older linux kernels provide up to MAX_ARG_PAGES (default: 32) of 2165 * argument/environment space. Newer kernels (>2.6.33) allow more, 2166 * dependent on stack size, but guarantee at least 32 pages for 2167 * backwards compatibility. 2168 */ 2169 #define STACK_LOWER_LIMIT (32 * TARGET_PAGE_SIZE) 2170 2171 static abi_ulong setup_arg_pages(struct linux_binprm *bprm, 2172 struct image_info *info) 2173 { 2174 abi_ulong size, error, guard; 2175 int prot; 2176 2177 size = guest_stack_size; 2178 if (size < STACK_LOWER_LIMIT) { 2179 size = STACK_LOWER_LIMIT; 2180 } 2181 2182 if (STACK_GROWS_DOWN) { 2183 guard = TARGET_PAGE_SIZE; 2184 if (guard < qemu_real_host_page_size()) { 2185 guard = qemu_real_host_page_size(); 2186 } 2187 } else { 2188 /* no guard page for hppa target where stack grows upwards. */ 2189 guard = 0; 2190 } 2191 2192 prot = PROT_READ | PROT_WRITE; 2193 if (info->exec_stack) { 2194 prot |= PROT_EXEC; 2195 } 2196 error = target_mmap(0, size + guard, prot, 2197 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 2198 if (error == -1) { 2199 perror("mmap stack"); 2200 exit(-1); 2201 } 2202 2203 /* We reserve one extra page at the top of the stack as guard. */ 2204 if (STACK_GROWS_DOWN) { 2205 target_mprotect(error, guard, PROT_NONE); 2206 info->stack_limit = error + guard; 2207 return info->stack_limit + size - sizeof(void *); 2208 } else { 2209 info->stack_limit = error + size; 2210 return error; 2211 } 2212 } 2213 2214 /* Map and zero the bss. We need to explicitly zero any fractional pages 2215 after the data section (i.e. bss). */ 2216 static void zero_bss(abi_ulong elf_bss, abi_ulong last_bss, int prot) 2217 { 2218 uintptr_t host_start, host_map_start, host_end; 2219 2220 last_bss = TARGET_PAGE_ALIGN(last_bss); 2221 2222 /* ??? There is confusion between qemu_real_host_page_size and 2223 qemu_host_page_size here and elsewhere in target_mmap, which 2224 may lead to the end of the data section mapping from the file 2225 not being mapped. At least there was an explicit test and 2226 comment for that here, suggesting that "the file size must 2227 be known". The comment probably pre-dates the introduction 2228 of the fstat system call in target_mmap which does in fact 2229 find out the size. What isn't clear is if the workaround 2230 here is still actually needed. For now, continue with it, 2231 but merge it with the "normal" mmap that would allocate the bss. */ 2232 2233 host_start = (uintptr_t) g2h_untagged(elf_bss); 2234 host_end = (uintptr_t) g2h_untagged(last_bss); 2235 host_map_start = REAL_HOST_PAGE_ALIGN(host_start); 2236 2237 if (host_map_start < host_end) { 2238 void *p = mmap((void *)host_map_start, host_end - host_map_start, 2239 prot, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 2240 if (p == MAP_FAILED) { 2241 perror("cannot mmap brk"); 2242 exit(-1); 2243 } 2244 } 2245 2246 /* Ensure that the bss page(s) are valid */ 2247 if ((page_get_flags(last_bss-1) & prot) != prot) { 2248 page_set_flags(elf_bss & TARGET_PAGE_MASK, last_bss - 1, 2249 prot | PAGE_VALID); 2250 } 2251 2252 if (host_start < host_map_start) { 2253 memset((void *)host_start, 0, host_map_start - host_start); 2254 } 2255 } 2256 2257 #if defined(TARGET_ARM) 2258 static int elf_is_fdpic(struct elfhdr *exec) 2259 { 2260 return exec->e_ident[EI_OSABI] == ELFOSABI_ARM_FDPIC; 2261 } 2262 #elif defined(TARGET_XTENSA) 2263 static int elf_is_fdpic(struct elfhdr *exec) 2264 { 2265 return exec->e_ident[EI_OSABI] == ELFOSABI_XTENSA_FDPIC; 2266 } 2267 #else 2268 /* Default implementation, always false. */ 2269 static int elf_is_fdpic(struct elfhdr *exec) 2270 { 2271 return 0; 2272 } 2273 #endif 2274 2275 static abi_ulong loader_build_fdpic_loadmap(struct image_info *info, abi_ulong sp) 2276 { 2277 uint16_t n; 2278 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs; 2279 2280 /* elf32_fdpic_loadseg */ 2281 n = info->nsegs; 2282 while (n--) { 2283 sp -= 12; 2284 put_user_u32(loadsegs[n].addr, sp+0); 2285 put_user_u32(loadsegs[n].p_vaddr, sp+4); 2286 put_user_u32(loadsegs[n].p_memsz, sp+8); 2287 } 2288 2289 /* elf32_fdpic_loadmap */ 2290 sp -= 4; 2291 put_user_u16(0, sp+0); /* version */ 2292 put_user_u16(info->nsegs, sp+2); /* nsegs */ 2293 2294 info->personality = PER_LINUX_FDPIC; 2295 info->loadmap_addr = sp; 2296 2297 return sp; 2298 } 2299 2300 static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc, 2301 struct elfhdr *exec, 2302 struct image_info *info, 2303 struct image_info *interp_info) 2304 { 2305 abi_ulong sp; 2306 abi_ulong u_argc, u_argv, u_envp, u_auxv; 2307 int size; 2308 int i; 2309 abi_ulong u_rand_bytes; 2310 uint8_t k_rand_bytes[16]; 2311 abi_ulong u_platform, u_base_platform; 2312 const char *k_platform, *k_base_platform; 2313 const int n = sizeof(elf_addr_t); 2314 2315 sp = p; 2316 2317 /* Needs to be before we load the env/argc/... */ 2318 if (elf_is_fdpic(exec)) { 2319 /* Need 4 byte alignment for these structs */ 2320 sp &= ~3; 2321 sp = loader_build_fdpic_loadmap(info, sp); 2322 info->other_info = interp_info; 2323 if (interp_info) { 2324 interp_info->other_info = info; 2325 sp = loader_build_fdpic_loadmap(interp_info, sp); 2326 info->interpreter_loadmap_addr = interp_info->loadmap_addr; 2327 info->interpreter_pt_dynamic_addr = interp_info->pt_dynamic_addr; 2328 } else { 2329 info->interpreter_loadmap_addr = 0; 2330 info->interpreter_pt_dynamic_addr = 0; 2331 } 2332 } 2333 2334 u_base_platform = 0; 2335 k_base_platform = ELF_BASE_PLATFORM; 2336 if (k_base_platform) { 2337 size_t len = strlen(k_base_platform) + 1; 2338 if (STACK_GROWS_DOWN) { 2339 sp -= (len + n - 1) & ~(n - 1); 2340 u_base_platform = sp; 2341 /* FIXME - check return value of memcpy_to_target() for failure */ 2342 memcpy_to_target(sp, k_base_platform, len); 2343 } else { 2344 memcpy_to_target(sp, k_base_platform, len); 2345 u_base_platform = sp; 2346 sp += len + 1; 2347 } 2348 } 2349 2350 u_platform = 0; 2351 k_platform = ELF_PLATFORM; 2352 if (k_platform) { 2353 size_t len = strlen(k_platform) + 1; 2354 if (STACK_GROWS_DOWN) { 2355 sp -= (len + n - 1) & ~(n - 1); 2356 u_platform = sp; 2357 /* FIXME - check return value of memcpy_to_target() for failure */ 2358 memcpy_to_target(sp, k_platform, len); 2359 } else { 2360 memcpy_to_target(sp, k_platform, len); 2361 u_platform = sp; 2362 sp += len + 1; 2363 } 2364 } 2365 2366 /* Provide 16 byte alignment for the PRNG, and basic alignment for 2367 * the argv and envp pointers. 2368 */ 2369 if (STACK_GROWS_DOWN) { 2370 sp = QEMU_ALIGN_DOWN(sp, 16); 2371 } else { 2372 sp = QEMU_ALIGN_UP(sp, 16); 2373 } 2374 2375 /* 2376 * Generate 16 random bytes for userspace PRNG seeding. 2377 */ 2378 qemu_guest_getrandom_nofail(k_rand_bytes, sizeof(k_rand_bytes)); 2379 if (STACK_GROWS_DOWN) { 2380 sp -= 16; 2381 u_rand_bytes = sp; 2382 /* FIXME - check return value of memcpy_to_target() for failure */ 2383 memcpy_to_target(sp, k_rand_bytes, 16); 2384 } else { 2385 memcpy_to_target(sp, k_rand_bytes, 16); 2386 u_rand_bytes = sp; 2387 sp += 16; 2388 } 2389 2390 size = (DLINFO_ITEMS + 1) * 2; 2391 if (k_base_platform) 2392 size += 2; 2393 if (k_platform) 2394 size += 2; 2395 #ifdef DLINFO_ARCH_ITEMS 2396 size += DLINFO_ARCH_ITEMS * 2; 2397 #endif 2398 #ifdef ELF_HWCAP2 2399 size += 2; 2400 #endif 2401 info->auxv_len = size * n; 2402 2403 size += envc + argc + 2; 2404 size += 1; /* argc itself */ 2405 size *= n; 2406 2407 /* Allocate space and finalize stack alignment for entry now. */ 2408 if (STACK_GROWS_DOWN) { 2409 u_argc = QEMU_ALIGN_DOWN(sp - size, STACK_ALIGNMENT); 2410 sp = u_argc; 2411 } else { 2412 u_argc = sp; 2413 sp = QEMU_ALIGN_UP(sp + size, STACK_ALIGNMENT); 2414 } 2415 2416 u_argv = u_argc + n; 2417 u_envp = u_argv + (argc + 1) * n; 2418 u_auxv = u_envp + (envc + 1) * n; 2419 info->saved_auxv = u_auxv; 2420 info->argc = argc; 2421 info->envc = envc; 2422 info->argv = u_argv; 2423 info->envp = u_envp; 2424 2425 /* This is correct because Linux defines 2426 * elf_addr_t as Elf32_Off / Elf64_Off 2427 */ 2428 #define NEW_AUX_ENT(id, val) do { \ 2429 put_user_ual(id, u_auxv); u_auxv += n; \ 2430 put_user_ual(val, u_auxv); u_auxv += n; \ 2431 } while(0) 2432 2433 #ifdef ARCH_DLINFO 2434 /* 2435 * ARCH_DLINFO must come first so platform specific code can enforce 2436 * special alignment requirements on the AUXV if necessary (eg. PPC). 2437 */ 2438 ARCH_DLINFO; 2439 #endif 2440 /* There must be exactly DLINFO_ITEMS entries here, or the assert 2441 * on info->auxv_len will trigger. 2442 */ 2443 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff)); 2444 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr))); 2445 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); 2446 if ((info->alignment & ~qemu_host_page_mask) != 0) { 2447 /* Target doesn't support host page size alignment */ 2448 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); 2449 } else { 2450 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(MAX(TARGET_PAGE_SIZE, 2451 qemu_host_page_size))); 2452 } 2453 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_info ? interp_info->load_addr : 0)); 2454 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); 2455 NEW_AUX_ENT(AT_ENTRY, info->entry); 2456 NEW_AUX_ENT(AT_UID, (abi_ulong) getuid()); 2457 NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid()); 2458 NEW_AUX_ENT(AT_GID, (abi_ulong) getgid()); 2459 NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid()); 2460 NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP); 2461 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK)); 2462 NEW_AUX_ENT(AT_RANDOM, (abi_ulong) u_rand_bytes); 2463 NEW_AUX_ENT(AT_SECURE, (abi_ulong) qemu_getauxval(AT_SECURE)); 2464 NEW_AUX_ENT(AT_EXECFN, info->file_string); 2465 2466 #ifdef ELF_HWCAP2 2467 NEW_AUX_ENT(AT_HWCAP2, (abi_ulong) ELF_HWCAP2); 2468 #endif 2469 2470 if (u_base_platform) { 2471 NEW_AUX_ENT(AT_BASE_PLATFORM, u_base_platform); 2472 } 2473 if (u_platform) { 2474 NEW_AUX_ENT(AT_PLATFORM, u_platform); 2475 } 2476 NEW_AUX_ENT (AT_NULL, 0); 2477 #undef NEW_AUX_ENT 2478 2479 /* Check that our initial calculation of the auxv length matches how much 2480 * we actually put into it. 2481 */ 2482 assert(info->auxv_len == u_auxv - info->saved_auxv); 2483 2484 put_user_ual(argc, u_argc); 2485 2486 p = info->arg_strings; 2487 for (i = 0; i < argc; ++i) { 2488 put_user_ual(p, u_argv); 2489 u_argv += n; 2490 p += target_strlen(p) + 1; 2491 } 2492 put_user_ual(0, u_argv); 2493 2494 p = info->env_strings; 2495 for (i = 0; i < envc; ++i) { 2496 put_user_ual(p, u_envp); 2497 u_envp += n; 2498 p += target_strlen(p) + 1; 2499 } 2500 put_user_ual(0, u_envp); 2501 2502 return sp; 2503 } 2504 2505 #if defined(HI_COMMPAGE) 2506 #define LO_COMMPAGE -1 2507 #elif defined(LO_COMMPAGE) 2508 #define HI_COMMPAGE 0 2509 #else 2510 #define HI_COMMPAGE 0 2511 #define LO_COMMPAGE -1 2512 #ifndef INIT_GUEST_COMMPAGE 2513 #define init_guest_commpage() true 2514 #endif 2515 #endif 2516 2517 static void pgb_fail_in_use(const char *image_name) 2518 { 2519 error_report("%s: requires virtual address space that is in use " 2520 "(omit the -B option or choose a different value)", 2521 image_name); 2522 exit(EXIT_FAILURE); 2523 } 2524 2525 static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr, 2526 abi_ulong guest_hiaddr, long align) 2527 { 2528 const int flags = MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE; 2529 void *addr, *test; 2530 2531 if (!QEMU_IS_ALIGNED(guest_base, align)) { 2532 fprintf(stderr, "Requested guest base %p does not satisfy " 2533 "host minimum alignment (0x%lx)\n", 2534 (void *)guest_base, align); 2535 exit(EXIT_FAILURE); 2536 } 2537 2538 /* Sanity check the guest binary. */ 2539 if (reserved_va) { 2540 if (guest_hiaddr > reserved_va) { 2541 error_report("%s: requires more than reserved virtual " 2542 "address space (0x%" PRIx64 " > 0x%lx)", 2543 image_name, (uint64_t)guest_hiaddr, reserved_va); 2544 exit(EXIT_FAILURE); 2545 } 2546 } else { 2547 #if HOST_LONG_BITS < TARGET_ABI_BITS 2548 if ((guest_hiaddr - guest_base) > ~(uintptr_t)0) { 2549 error_report("%s: requires more virtual address space " 2550 "than the host can provide (0x%" PRIx64 ")", 2551 image_name, (uint64_t)guest_hiaddr + 1 - guest_base); 2552 exit(EXIT_FAILURE); 2553 } 2554 #endif 2555 } 2556 2557 /* 2558 * Expand the allocation to the entire reserved_va. 2559 * Exclude the mmap_min_addr hole. 2560 */ 2561 if (reserved_va) { 2562 guest_loaddr = (guest_base >= mmap_min_addr ? 0 2563 : mmap_min_addr - guest_base); 2564 guest_hiaddr = reserved_va; 2565 } 2566 2567 /* Reserve the address space for the binary, or reserved_va. */ 2568 test = g2h_untagged(guest_loaddr); 2569 addr = mmap(test, guest_hiaddr - guest_loaddr + 1, PROT_NONE, flags, -1, 0); 2570 if (test != addr) { 2571 pgb_fail_in_use(image_name); 2572 } 2573 qemu_log_mask(CPU_LOG_PAGE, 2574 "%s: base @ %p for %" PRIu64 " bytes\n", 2575 __func__, addr, (uint64_t)guest_hiaddr - guest_loaddr + 1); 2576 } 2577 2578 /** 2579 * pgd_find_hole_fallback: potential mmap address 2580 * @guest_size: size of available space 2581 * @brk: location of break 2582 * @align: memory alignment 2583 * 2584 * This is a fallback method for finding a hole in the host address 2585 * space if we don't have the benefit of being able to access 2586 * /proc/self/map. It can potentially take a very long time as we can 2587 * only dumbly iterate up the host address space seeing if the 2588 * allocation would work. 2589 */ 2590 static uintptr_t pgd_find_hole_fallback(uintptr_t guest_size, uintptr_t brk, 2591 long align, uintptr_t offset) 2592 { 2593 uintptr_t base; 2594 2595 /* Start (aligned) at the bottom and work our way up */ 2596 base = ROUND_UP(mmap_min_addr, align); 2597 2598 while (true) { 2599 uintptr_t align_start, end; 2600 align_start = ROUND_UP(base, align); 2601 end = align_start + guest_size + offset; 2602 2603 /* if brk is anywhere in the range give ourselves some room to grow. */ 2604 if (align_start <= brk && brk < end) { 2605 base = brk + (16 * MiB); 2606 continue; 2607 } else if (align_start + guest_size < align_start) { 2608 /* we have run out of space */ 2609 return -1; 2610 } else { 2611 int flags = MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE | 2612 MAP_FIXED_NOREPLACE; 2613 void * mmap_start = mmap((void *) align_start, guest_size, 2614 PROT_NONE, flags, -1, 0); 2615 if (mmap_start != MAP_FAILED) { 2616 munmap(mmap_start, guest_size); 2617 if (mmap_start == (void *) align_start) { 2618 qemu_log_mask(CPU_LOG_PAGE, 2619 "%s: base @ %p for %" PRIdPTR" bytes\n", 2620 __func__, mmap_start + offset, guest_size); 2621 return (uintptr_t) mmap_start + offset; 2622 } 2623 } 2624 base += qemu_host_page_size; 2625 } 2626 } 2627 } 2628 2629 /* Return value for guest_base, or -1 if no hole found. */ 2630 static uintptr_t pgb_find_hole(uintptr_t guest_loaddr, uintptr_t guest_size, 2631 long align, uintptr_t offset) 2632 { 2633 GSList *maps, *iter; 2634 uintptr_t this_start, this_end, next_start, brk; 2635 intptr_t ret = -1; 2636 2637 assert(QEMU_IS_ALIGNED(guest_loaddr, align)); 2638 2639 maps = read_self_maps(); 2640 2641 /* Read brk after we've read the maps, which will malloc. */ 2642 brk = (uintptr_t)sbrk(0); 2643 2644 if (!maps) { 2645 return pgd_find_hole_fallback(guest_size, brk, align, offset); 2646 } 2647 2648 /* The first hole is before the first map entry. */ 2649 this_start = mmap_min_addr; 2650 2651 for (iter = maps; iter; 2652 this_start = next_start, iter = g_slist_next(iter)) { 2653 uintptr_t align_start, hole_size; 2654 2655 this_end = ((MapInfo *)iter->data)->start; 2656 next_start = ((MapInfo *)iter->data)->end; 2657 align_start = ROUND_UP(this_start + offset, align); 2658 2659 /* Skip holes that are too small. */ 2660 if (align_start >= this_end) { 2661 continue; 2662 } 2663 hole_size = this_end - align_start; 2664 if (hole_size < guest_size) { 2665 continue; 2666 } 2667 2668 /* If this hole contains brk, give ourselves some room to grow. */ 2669 if (this_start <= brk && brk < this_end) { 2670 hole_size -= guest_size; 2671 if (sizeof(uintptr_t) == 8 && hole_size >= 1 * GiB) { 2672 align_start += 1 * GiB; 2673 } else if (hole_size >= 16 * MiB) { 2674 align_start += 16 * MiB; 2675 } else { 2676 align_start = (this_end - guest_size) & -align; 2677 if (align_start < this_start) { 2678 continue; 2679 } 2680 } 2681 } 2682 2683 /* Record the lowest successful match. */ 2684 if (ret < 0) { 2685 ret = align_start; 2686 } 2687 /* If this hole contains the identity map, select it. */ 2688 if (align_start <= guest_loaddr && 2689 guest_loaddr + guest_size <= this_end) { 2690 ret = 0; 2691 } 2692 /* If this hole ends above the identity map, stop looking. */ 2693 if (this_end >= guest_loaddr) { 2694 break; 2695 } 2696 } 2697 free_self_maps(maps); 2698 2699 if (ret != -1) { 2700 qemu_log_mask(CPU_LOG_PAGE, "%s: base @ %" PRIxPTR 2701 " for %" PRIuPTR " bytes\n", 2702 __func__, ret, guest_size); 2703 } 2704 2705 return ret; 2706 } 2707 2708 static void pgb_static(const char *image_name, abi_ulong orig_loaddr, 2709 abi_ulong orig_hiaddr, long align) 2710 { 2711 uintptr_t loaddr = orig_loaddr; 2712 uintptr_t hiaddr = orig_hiaddr; 2713 uintptr_t offset = 0; 2714 uintptr_t addr; 2715 2716 if (hiaddr != orig_hiaddr) { 2717 error_report("%s: requires virtual address space that the " 2718 "host cannot provide (0x%" PRIx64 ")", 2719 image_name, (uint64_t)orig_hiaddr + 1); 2720 exit(EXIT_FAILURE); 2721 } 2722 2723 loaddr &= -align; 2724 if (HI_COMMPAGE) { 2725 /* 2726 * Extend the allocation to include the commpage. 2727 * For a 64-bit host, this is just 4GiB; for a 32-bit host we 2728 * need to ensure there is space bellow the guest_base so we 2729 * can map the commpage in the place needed when the address 2730 * arithmetic wraps around. 2731 */ 2732 if (sizeof(uintptr_t) == 8 || loaddr >= 0x80000000u) { 2733 hiaddr = UINT32_MAX; 2734 } else { 2735 offset = -(HI_COMMPAGE & -align); 2736 } 2737 } else if (LO_COMMPAGE != -1) { 2738 loaddr = MIN(loaddr, LO_COMMPAGE & -align); 2739 } 2740 2741 addr = pgb_find_hole(loaddr, hiaddr - loaddr + 1, align, offset); 2742 if (addr == -1) { 2743 /* 2744 * If HI_COMMPAGE, there *might* be a non-consecutive allocation 2745 * that can satisfy both. But as the normal arm32 link base address 2746 * is ~32k, and we extend down to include the commpage, making the 2747 * overhead only ~96k, this is unlikely. 2748 */ 2749 error_report("%s: Unable to allocate %#zx bytes of " 2750 "virtual address space", image_name, 2751 (size_t)(hiaddr - loaddr)); 2752 exit(EXIT_FAILURE); 2753 } 2754 2755 guest_base = addr; 2756 2757 qemu_log_mask(CPU_LOG_PAGE, "%s: base @ %"PRIxPTR" for %" PRIuPTR" bytes\n", 2758 __func__, addr, hiaddr - loaddr); 2759 } 2760 2761 static void pgb_dynamic(const char *image_name, long align) 2762 { 2763 /* 2764 * The executable is dynamic and does not require a fixed address. 2765 * All we need is a commpage that satisfies align. 2766 * If we do not need a commpage, leave guest_base == 0. 2767 */ 2768 if (HI_COMMPAGE) { 2769 uintptr_t addr, commpage; 2770 2771 /* 64-bit hosts should have used reserved_va. */ 2772 assert(sizeof(uintptr_t) == 4); 2773 2774 /* 2775 * By putting the commpage at the first hole, that puts guest_base 2776 * just above that, and maximises the positive guest addresses. 2777 */ 2778 commpage = HI_COMMPAGE & -align; 2779 addr = pgb_find_hole(commpage, -commpage, align, 0); 2780 assert(addr != -1); 2781 guest_base = addr; 2782 } 2783 } 2784 2785 static void pgb_reserved_va(const char *image_name, abi_ulong guest_loaddr, 2786 abi_ulong guest_hiaddr, long align) 2787 { 2788 int flags = MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE; 2789 void *addr, *test; 2790 2791 if (guest_hiaddr > reserved_va) { 2792 error_report("%s: requires more than reserved virtual " 2793 "address space (0x%" PRIx64 " > 0x%lx)", 2794 image_name, (uint64_t)guest_hiaddr, reserved_va); 2795 exit(EXIT_FAILURE); 2796 } 2797 2798 /* Widen the "image" to the entire reserved address space. */ 2799 pgb_static(image_name, 0, reserved_va, align); 2800 2801 /* osdep.h defines this as 0 if it's missing */ 2802 flags |= MAP_FIXED_NOREPLACE; 2803 2804 /* Reserve the memory on the host. */ 2805 assert(guest_base != 0); 2806 test = g2h_untagged(0); 2807 addr = mmap(test, reserved_va + 1, PROT_NONE, flags, -1, 0); 2808 if (addr == MAP_FAILED || addr != test) { 2809 error_report("Unable to reserve 0x%lx bytes of virtual address " 2810 "space at %p (%s) for use as guest address space (check your " 2811 "virtual memory ulimit setting, mmap_min_addr or reserve less " 2812 "using qemu-user's -R option)", 2813 reserved_va + 1, test, strerror(errno)); 2814 exit(EXIT_FAILURE); 2815 } 2816 2817 qemu_log_mask(CPU_LOG_PAGE, "%s: base @ %p for %lu bytes\n", 2818 __func__, addr, reserved_va + 1); 2819 } 2820 2821 void probe_guest_base(const char *image_name, abi_ulong guest_loaddr, 2822 abi_ulong guest_hiaddr) 2823 { 2824 /* In order to use host shmat, we must be able to honor SHMLBA. */ 2825 uintptr_t align = MAX(SHMLBA, qemu_host_page_size); 2826 2827 if (have_guest_base) { 2828 pgb_have_guest_base(image_name, guest_loaddr, guest_hiaddr, align); 2829 } else if (reserved_va) { 2830 pgb_reserved_va(image_name, guest_loaddr, guest_hiaddr, align); 2831 } else if (guest_loaddr) { 2832 pgb_static(image_name, guest_loaddr, guest_hiaddr, align); 2833 } else { 2834 pgb_dynamic(image_name, align); 2835 } 2836 2837 /* Reserve and initialize the commpage. */ 2838 if (!init_guest_commpage()) { 2839 /* 2840 * With have_guest_base, the user has selected the address and 2841 * we are trying to work with that. Otherwise, we have selected 2842 * free space and init_guest_commpage must succeeded. 2843 */ 2844 assert(have_guest_base); 2845 pgb_fail_in_use(image_name); 2846 } 2847 2848 assert(QEMU_IS_ALIGNED(guest_base, align)); 2849 qemu_log_mask(CPU_LOG_PAGE, "Locating guest address space " 2850 "@ 0x%" PRIx64 "\n", (uint64_t)guest_base); 2851 } 2852 2853 enum { 2854 /* The string "GNU\0" as a magic number. */ 2855 GNU0_MAGIC = const_le32('G' | 'N' << 8 | 'U' << 16), 2856 NOTE_DATA_SZ = 1 * KiB, 2857 NOTE_NAME_SZ = 4, 2858 ELF_GNU_PROPERTY_ALIGN = ELF_CLASS == ELFCLASS32 ? 4 : 8, 2859 }; 2860 2861 /* 2862 * Process a single gnu_property entry. 2863 * Return false for error. 2864 */ 2865 static bool parse_elf_property(const uint32_t *data, int *off, int datasz, 2866 struct image_info *info, bool have_prev_type, 2867 uint32_t *prev_type, Error **errp) 2868 { 2869 uint32_t pr_type, pr_datasz, step; 2870 2871 if (*off > datasz || !QEMU_IS_ALIGNED(*off, ELF_GNU_PROPERTY_ALIGN)) { 2872 goto error_data; 2873 } 2874 datasz -= *off; 2875 data += *off / sizeof(uint32_t); 2876 2877 if (datasz < 2 * sizeof(uint32_t)) { 2878 goto error_data; 2879 } 2880 pr_type = data[0]; 2881 pr_datasz = data[1]; 2882 data += 2; 2883 datasz -= 2 * sizeof(uint32_t); 2884 step = ROUND_UP(pr_datasz, ELF_GNU_PROPERTY_ALIGN); 2885 if (step > datasz) { 2886 goto error_data; 2887 } 2888 2889 /* Properties are supposed to be unique and sorted on pr_type. */ 2890 if (have_prev_type && pr_type <= *prev_type) { 2891 if (pr_type == *prev_type) { 2892 error_setg(errp, "Duplicate property in PT_GNU_PROPERTY"); 2893 } else { 2894 error_setg(errp, "Unsorted property in PT_GNU_PROPERTY"); 2895 } 2896 return false; 2897 } 2898 *prev_type = pr_type; 2899 2900 if (!arch_parse_elf_property(pr_type, pr_datasz, data, info, errp)) { 2901 return false; 2902 } 2903 2904 *off += 2 * sizeof(uint32_t) + step; 2905 return true; 2906 2907 error_data: 2908 error_setg(errp, "Ill-formed property in PT_GNU_PROPERTY"); 2909 return false; 2910 } 2911 2912 /* Process NT_GNU_PROPERTY_TYPE_0. */ 2913 static bool parse_elf_properties(int image_fd, 2914 struct image_info *info, 2915 const struct elf_phdr *phdr, 2916 char bprm_buf[BPRM_BUF_SIZE], 2917 Error **errp) 2918 { 2919 union { 2920 struct elf_note nhdr; 2921 uint32_t data[NOTE_DATA_SZ / sizeof(uint32_t)]; 2922 } note; 2923 2924 int n, off, datasz; 2925 bool have_prev_type; 2926 uint32_t prev_type; 2927 2928 /* Unless the arch requires properties, ignore them. */ 2929 if (!ARCH_USE_GNU_PROPERTY) { 2930 return true; 2931 } 2932 2933 /* If the properties are crazy large, that's too bad. */ 2934 n = phdr->p_filesz; 2935 if (n > sizeof(note)) { 2936 error_setg(errp, "PT_GNU_PROPERTY too large"); 2937 return false; 2938 } 2939 if (n < sizeof(note.nhdr)) { 2940 error_setg(errp, "PT_GNU_PROPERTY too small"); 2941 return false; 2942 } 2943 2944 if (phdr->p_offset + n <= BPRM_BUF_SIZE) { 2945 memcpy(¬e, bprm_buf + phdr->p_offset, n); 2946 } else { 2947 ssize_t len = pread(image_fd, ¬e, n, phdr->p_offset); 2948 if (len != n) { 2949 error_setg_errno(errp, errno, "Error reading file header"); 2950 return false; 2951 } 2952 } 2953 2954 /* 2955 * The contents of a valid PT_GNU_PROPERTY is a sequence 2956 * of uint32_t -- swap them all now. 2957 */ 2958 #ifdef BSWAP_NEEDED 2959 for (int i = 0; i < n / 4; i++) { 2960 bswap32s(note.data + i); 2961 } 2962 #endif 2963 2964 /* 2965 * Note that nhdr is 3 words, and that the "name" described by namesz 2966 * immediately follows nhdr and is thus at the 4th word. Further, all 2967 * of the inputs to the kernel's round_up are multiples of 4. 2968 */ 2969 if (note.nhdr.n_type != NT_GNU_PROPERTY_TYPE_0 || 2970 note.nhdr.n_namesz != NOTE_NAME_SZ || 2971 note.data[3] != GNU0_MAGIC) { 2972 error_setg(errp, "Invalid note in PT_GNU_PROPERTY"); 2973 return false; 2974 } 2975 off = sizeof(note.nhdr) + NOTE_NAME_SZ; 2976 2977 datasz = note.nhdr.n_descsz + off; 2978 if (datasz > n) { 2979 error_setg(errp, "Invalid note size in PT_GNU_PROPERTY"); 2980 return false; 2981 } 2982 2983 have_prev_type = false; 2984 prev_type = 0; 2985 while (1) { 2986 if (off == datasz) { 2987 return true; /* end, exit ok */ 2988 } 2989 if (!parse_elf_property(note.data, &off, datasz, info, 2990 have_prev_type, &prev_type, errp)) { 2991 return false; 2992 } 2993 have_prev_type = true; 2994 } 2995 } 2996 2997 /* Load an ELF image into the address space. 2998 2999 IMAGE_NAME is the filename of the image, to use in error messages. 3000 IMAGE_FD is the open file descriptor for the image. 3001 3002 BPRM_BUF is a copy of the beginning of the file; this of course 3003 contains the elf file header at offset 0. It is assumed that this 3004 buffer is sufficiently aligned to present no problems to the host 3005 in accessing data at aligned offsets within the buffer. 3006 3007 On return: INFO values will be filled in, as necessary or available. */ 3008 3009 static void load_elf_image(const char *image_name, int image_fd, 3010 struct image_info *info, char **pinterp_name, 3011 char bprm_buf[BPRM_BUF_SIZE]) 3012 { 3013 struct elfhdr *ehdr = (struct elfhdr *)bprm_buf; 3014 struct elf_phdr *phdr; 3015 abi_ulong load_addr, load_bias, loaddr, hiaddr, error; 3016 int i, retval, prot_exec; 3017 Error *err = NULL; 3018 3019 /* First of all, some simple consistency checks */ 3020 if (!elf_check_ident(ehdr)) { 3021 error_setg(&err, "Invalid ELF image for this architecture"); 3022 goto exit_errmsg; 3023 } 3024 bswap_ehdr(ehdr); 3025 if (!elf_check_ehdr(ehdr)) { 3026 error_setg(&err, "Invalid ELF image for this architecture"); 3027 goto exit_errmsg; 3028 } 3029 3030 i = ehdr->e_phnum * sizeof(struct elf_phdr); 3031 if (ehdr->e_phoff + i <= BPRM_BUF_SIZE) { 3032 phdr = (struct elf_phdr *)(bprm_buf + ehdr->e_phoff); 3033 } else { 3034 phdr = (struct elf_phdr *) alloca(i); 3035 retval = pread(image_fd, phdr, i, ehdr->e_phoff); 3036 if (retval != i) { 3037 goto exit_read; 3038 } 3039 } 3040 bswap_phdr(phdr, ehdr->e_phnum); 3041 3042 info->nsegs = 0; 3043 info->pt_dynamic_addr = 0; 3044 3045 mmap_lock(); 3046 3047 /* 3048 * Find the maximum size of the image and allocate an appropriate 3049 * amount of memory to handle that. Locate the interpreter, if any. 3050 */ 3051 loaddr = -1, hiaddr = 0; 3052 info->alignment = 0; 3053 info->exec_stack = EXSTACK_DEFAULT; 3054 for (i = 0; i < ehdr->e_phnum; ++i) { 3055 struct elf_phdr *eppnt = phdr + i; 3056 if (eppnt->p_type == PT_LOAD) { 3057 abi_ulong a = eppnt->p_vaddr - eppnt->p_offset; 3058 if (a < loaddr) { 3059 loaddr = a; 3060 } 3061 a = eppnt->p_vaddr + eppnt->p_memsz - 1; 3062 if (a > hiaddr) { 3063 hiaddr = a; 3064 } 3065 ++info->nsegs; 3066 info->alignment |= eppnt->p_align; 3067 } else if (eppnt->p_type == PT_INTERP && pinterp_name) { 3068 g_autofree char *interp_name = NULL; 3069 3070 if (*pinterp_name) { 3071 error_setg(&err, "Multiple PT_INTERP entries"); 3072 goto exit_errmsg; 3073 } 3074 3075 interp_name = g_malloc(eppnt->p_filesz); 3076 3077 if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) { 3078 memcpy(interp_name, bprm_buf + eppnt->p_offset, 3079 eppnt->p_filesz); 3080 } else { 3081 retval = pread(image_fd, interp_name, eppnt->p_filesz, 3082 eppnt->p_offset); 3083 if (retval != eppnt->p_filesz) { 3084 goto exit_read; 3085 } 3086 } 3087 if (interp_name[eppnt->p_filesz - 1] != 0) { 3088 error_setg(&err, "Invalid PT_INTERP entry"); 3089 goto exit_errmsg; 3090 } 3091 *pinterp_name = g_steal_pointer(&interp_name); 3092 } else if (eppnt->p_type == PT_GNU_PROPERTY) { 3093 if (!parse_elf_properties(image_fd, info, eppnt, bprm_buf, &err)) { 3094 goto exit_errmsg; 3095 } 3096 } else if (eppnt->p_type == PT_GNU_STACK) { 3097 info->exec_stack = eppnt->p_flags & PF_X; 3098 } 3099 } 3100 3101 load_addr = loaddr; 3102 3103 if (pinterp_name != NULL) { 3104 if (ehdr->e_type == ET_EXEC) { 3105 /* 3106 * Make sure that the low address does not conflict with 3107 * MMAP_MIN_ADDR or the QEMU application itself. 3108 */ 3109 probe_guest_base(image_name, loaddr, hiaddr); 3110 } else { 3111 abi_ulong align; 3112 3113 /* 3114 * The binary is dynamic, but we still need to 3115 * select guest_base. In this case we pass a size. 3116 */ 3117 probe_guest_base(image_name, 0, hiaddr - loaddr); 3118 3119 /* 3120 * Avoid collision with the loader by providing a different 3121 * default load address. 3122 */ 3123 load_addr += elf_et_dyn_base; 3124 3125 /* 3126 * TODO: Better support for mmap alignment is desirable. 3127 * Since we do not have complete control over the guest 3128 * address space, we prefer the kernel to choose some address 3129 * rather than force the use of LOAD_ADDR via MAP_FIXED. 3130 * But without MAP_FIXED we cannot guarantee alignment, 3131 * only suggest it. 3132 */ 3133 align = pow2ceil(info->alignment); 3134 if (align) { 3135 load_addr &= -align; 3136 } 3137 } 3138 } 3139 3140 /* 3141 * Reserve address space for all of this. 3142 * 3143 * In the case of ET_EXEC, we supply MAP_FIXED_NOREPLACE so that we get 3144 * exactly the address range that is required. Without reserved_va, 3145 * the guest address space is not isolated. We have attempted to avoid 3146 * conflict with the host program itself via probe_guest_base, but using 3147 * MAP_FIXED_NOREPLACE instead of MAP_FIXED provides an extra check. 3148 * 3149 * Otherwise this is ET_DYN, and we are searching for a location 3150 * that can hold the memory space required. If the image is 3151 * pre-linked, LOAD_ADDR will be non-zero, and the kernel should 3152 * honor that address if it happens to be free. 3153 * 3154 * In both cases, we will overwrite pages in this range with mappings 3155 * from the executable. 3156 */ 3157 load_addr = target_mmap(load_addr, (size_t)hiaddr - loaddr + 1, PROT_NONE, 3158 MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | 3159 (ehdr->e_type == ET_EXEC ? MAP_FIXED_NOREPLACE : 0), 3160 -1, 0); 3161 if (load_addr == -1) { 3162 goto exit_mmap; 3163 } 3164 load_bias = load_addr - loaddr; 3165 3166 if (elf_is_fdpic(ehdr)) { 3167 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs = 3168 g_malloc(sizeof(*loadsegs) * info->nsegs); 3169 3170 for (i = 0; i < ehdr->e_phnum; ++i) { 3171 switch (phdr[i].p_type) { 3172 case PT_DYNAMIC: 3173 info->pt_dynamic_addr = phdr[i].p_vaddr + load_bias; 3174 break; 3175 case PT_LOAD: 3176 loadsegs->addr = phdr[i].p_vaddr + load_bias; 3177 loadsegs->p_vaddr = phdr[i].p_vaddr; 3178 loadsegs->p_memsz = phdr[i].p_memsz; 3179 ++loadsegs; 3180 break; 3181 } 3182 } 3183 } 3184 3185 info->load_bias = load_bias; 3186 info->code_offset = load_bias; 3187 info->data_offset = load_bias; 3188 info->load_addr = load_addr; 3189 info->entry = ehdr->e_entry + load_bias; 3190 info->start_code = -1; 3191 info->end_code = 0; 3192 info->start_data = -1; 3193 info->end_data = 0; 3194 /* Usual start for brk is after all sections of the main executable. */ 3195 info->brk = TARGET_PAGE_ALIGN(hiaddr); 3196 info->elf_flags = ehdr->e_flags; 3197 3198 prot_exec = PROT_EXEC; 3199 #ifdef TARGET_AARCH64 3200 /* 3201 * If the BTI feature is present, this indicates that the executable 3202 * pages of the startup binary should be mapped with PROT_BTI, so that 3203 * branch targets are enforced. 3204 * 3205 * The startup binary is either the interpreter or the static executable. 3206 * The interpreter is responsible for all pages of a dynamic executable. 3207 * 3208 * Elf notes are backward compatible to older cpus. 3209 * Do not enable BTI unless it is supported. 3210 */ 3211 if ((info->note_flags & GNU_PROPERTY_AARCH64_FEATURE_1_BTI) 3212 && (pinterp_name == NULL || *pinterp_name == 0) 3213 && cpu_isar_feature(aa64_bti, ARM_CPU(thread_cpu))) { 3214 prot_exec |= TARGET_PROT_BTI; 3215 } 3216 #endif 3217 3218 for (i = 0; i < ehdr->e_phnum; i++) { 3219 struct elf_phdr *eppnt = phdr + i; 3220 if (eppnt->p_type == PT_LOAD) { 3221 abi_ulong vaddr, vaddr_po, vaddr_ps, vaddr_ef, vaddr_em, vaddr_len; 3222 int elf_prot = 0; 3223 3224 if (eppnt->p_flags & PF_R) { 3225 elf_prot |= PROT_READ; 3226 } 3227 if (eppnt->p_flags & PF_W) { 3228 elf_prot |= PROT_WRITE; 3229 } 3230 if (eppnt->p_flags & PF_X) { 3231 elf_prot |= prot_exec; 3232 } 3233 3234 vaddr = load_bias + eppnt->p_vaddr; 3235 vaddr_po = vaddr & ~TARGET_PAGE_MASK; 3236 vaddr_ps = vaddr & TARGET_PAGE_MASK; 3237 3238 vaddr_ef = vaddr + eppnt->p_filesz; 3239 vaddr_em = vaddr + eppnt->p_memsz; 3240 3241 /* 3242 * Some segments may be completely empty, with a non-zero p_memsz 3243 * but no backing file segment. 3244 */ 3245 if (eppnt->p_filesz != 0) { 3246 vaddr_len = eppnt->p_filesz + vaddr_po; 3247 error = target_mmap(vaddr_ps, vaddr_len, elf_prot, 3248 MAP_PRIVATE | MAP_FIXED, 3249 image_fd, eppnt->p_offset - vaddr_po); 3250 3251 if (error == -1) { 3252 goto exit_mmap; 3253 } 3254 3255 /* 3256 * If the load segment requests extra zeros (e.g. bss), map it. 3257 */ 3258 if (eppnt->p_filesz < eppnt->p_memsz) { 3259 zero_bss(vaddr_ef, vaddr_em, elf_prot); 3260 } 3261 } else if (eppnt->p_memsz != 0) { 3262 vaddr_len = eppnt->p_memsz + vaddr_po; 3263 error = target_mmap(vaddr_ps, vaddr_len, elf_prot, 3264 MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, 3265 -1, 0); 3266 3267 if (error == -1) { 3268 goto exit_mmap; 3269 } 3270 } 3271 3272 /* Find the full program boundaries. */ 3273 if (elf_prot & PROT_EXEC) { 3274 if (vaddr < info->start_code) { 3275 info->start_code = vaddr; 3276 } 3277 if (vaddr_ef > info->end_code) { 3278 info->end_code = vaddr_ef; 3279 } 3280 } 3281 if (elf_prot & PROT_WRITE) { 3282 if (vaddr < info->start_data) { 3283 info->start_data = vaddr; 3284 } 3285 if (vaddr_ef > info->end_data) { 3286 info->end_data = vaddr_ef; 3287 } 3288 } 3289 #ifdef TARGET_MIPS 3290 } else if (eppnt->p_type == PT_MIPS_ABIFLAGS) { 3291 Mips_elf_abiflags_v0 abiflags; 3292 if (eppnt->p_filesz < sizeof(Mips_elf_abiflags_v0)) { 3293 error_setg(&err, "Invalid PT_MIPS_ABIFLAGS entry"); 3294 goto exit_errmsg; 3295 } 3296 if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) { 3297 memcpy(&abiflags, bprm_buf + eppnt->p_offset, 3298 sizeof(Mips_elf_abiflags_v0)); 3299 } else { 3300 retval = pread(image_fd, &abiflags, sizeof(Mips_elf_abiflags_v0), 3301 eppnt->p_offset); 3302 if (retval != sizeof(Mips_elf_abiflags_v0)) { 3303 goto exit_read; 3304 } 3305 } 3306 bswap_mips_abiflags(&abiflags); 3307 info->fp_abi = abiflags.fp_abi; 3308 #endif 3309 } 3310 } 3311 3312 if (info->end_data == 0) { 3313 info->start_data = info->end_code; 3314 info->end_data = info->end_code; 3315 } 3316 3317 if (qemu_log_enabled()) { 3318 load_symbols(ehdr, image_fd, load_bias); 3319 } 3320 3321 debuginfo_report_elf(image_name, image_fd, load_bias); 3322 3323 mmap_unlock(); 3324 3325 close(image_fd); 3326 return; 3327 3328 exit_read: 3329 if (retval >= 0) { 3330 error_setg(&err, "Incomplete read of file header"); 3331 } else { 3332 error_setg_errno(&err, errno, "Error reading file header"); 3333 } 3334 goto exit_errmsg; 3335 exit_mmap: 3336 error_setg_errno(&err, errno, "Error mapping file"); 3337 goto exit_errmsg; 3338 exit_errmsg: 3339 error_reportf_err(err, "%s: ", image_name); 3340 exit(-1); 3341 } 3342 3343 static void load_elf_interp(const char *filename, struct image_info *info, 3344 char bprm_buf[BPRM_BUF_SIZE]) 3345 { 3346 int fd, retval; 3347 Error *err = NULL; 3348 3349 fd = open(path(filename), O_RDONLY); 3350 if (fd < 0) { 3351 error_setg_file_open(&err, errno, filename); 3352 error_report_err(err); 3353 exit(-1); 3354 } 3355 3356 retval = read(fd, bprm_buf, BPRM_BUF_SIZE); 3357 if (retval < 0) { 3358 error_setg_errno(&err, errno, "Error reading file header"); 3359 error_reportf_err(err, "%s: ", filename); 3360 exit(-1); 3361 } 3362 3363 if (retval < BPRM_BUF_SIZE) { 3364 memset(bprm_buf + retval, 0, BPRM_BUF_SIZE - retval); 3365 } 3366 3367 load_elf_image(filename, fd, info, NULL, bprm_buf); 3368 } 3369 3370 static int symfind(const void *s0, const void *s1) 3371 { 3372 struct elf_sym *sym = (struct elf_sym *)s1; 3373 __typeof(sym->st_value) addr = *(uint64_t *)s0; 3374 int result = 0; 3375 3376 if (addr < sym->st_value) { 3377 result = -1; 3378 } else if (addr >= sym->st_value + sym->st_size) { 3379 result = 1; 3380 } 3381 return result; 3382 } 3383 3384 static const char *lookup_symbolxx(struct syminfo *s, uint64_t orig_addr) 3385 { 3386 #if ELF_CLASS == ELFCLASS32 3387 struct elf_sym *syms = s->disas_symtab.elf32; 3388 #else 3389 struct elf_sym *syms = s->disas_symtab.elf64; 3390 #endif 3391 3392 // binary search 3393 struct elf_sym *sym; 3394 3395 sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind); 3396 if (sym != NULL) { 3397 return s->disas_strtab + sym->st_name; 3398 } 3399 3400 return ""; 3401 } 3402 3403 /* FIXME: This should use elf_ops.h */ 3404 static int symcmp(const void *s0, const void *s1) 3405 { 3406 struct elf_sym *sym0 = (struct elf_sym *)s0; 3407 struct elf_sym *sym1 = (struct elf_sym *)s1; 3408 return (sym0->st_value < sym1->st_value) 3409 ? -1 3410 : ((sym0->st_value > sym1->st_value) ? 1 : 0); 3411 } 3412 3413 /* Best attempt to load symbols from this ELF object. */ 3414 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias) 3415 { 3416 int i, shnum, nsyms, sym_idx = 0, str_idx = 0; 3417 uint64_t segsz; 3418 struct elf_shdr *shdr; 3419 char *strings = NULL; 3420 struct syminfo *s = NULL; 3421 struct elf_sym *new_syms, *syms = NULL; 3422 3423 shnum = hdr->e_shnum; 3424 i = shnum * sizeof(struct elf_shdr); 3425 shdr = (struct elf_shdr *)alloca(i); 3426 if (pread(fd, shdr, i, hdr->e_shoff) != i) { 3427 return; 3428 } 3429 3430 bswap_shdr(shdr, shnum); 3431 for (i = 0; i < shnum; ++i) { 3432 if (shdr[i].sh_type == SHT_SYMTAB) { 3433 sym_idx = i; 3434 str_idx = shdr[i].sh_link; 3435 goto found; 3436 } 3437 } 3438 3439 /* There will be no symbol table if the file was stripped. */ 3440 return; 3441 3442 found: 3443 /* Now know where the strtab and symtab are. Snarf them. */ 3444 s = g_try_new(struct syminfo, 1); 3445 if (!s) { 3446 goto give_up; 3447 } 3448 3449 segsz = shdr[str_idx].sh_size; 3450 s->disas_strtab = strings = g_try_malloc(segsz); 3451 if (!strings || 3452 pread(fd, strings, segsz, shdr[str_idx].sh_offset) != segsz) { 3453 goto give_up; 3454 } 3455 3456 segsz = shdr[sym_idx].sh_size; 3457 syms = g_try_malloc(segsz); 3458 if (!syms || pread(fd, syms, segsz, shdr[sym_idx].sh_offset) != segsz) { 3459 goto give_up; 3460 } 3461 3462 if (segsz / sizeof(struct elf_sym) > INT_MAX) { 3463 /* Implausibly large symbol table: give up rather than ploughing 3464 * on with the number of symbols calculation overflowing 3465 */ 3466 goto give_up; 3467 } 3468 nsyms = segsz / sizeof(struct elf_sym); 3469 for (i = 0; i < nsyms; ) { 3470 bswap_sym(syms + i); 3471 /* Throw away entries which we do not need. */ 3472 if (syms[i].st_shndx == SHN_UNDEF 3473 || syms[i].st_shndx >= SHN_LORESERVE 3474 || ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) { 3475 if (i < --nsyms) { 3476 syms[i] = syms[nsyms]; 3477 } 3478 } else { 3479 #if defined(TARGET_ARM) || defined (TARGET_MIPS) 3480 /* The bottom address bit marks a Thumb or MIPS16 symbol. */ 3481 syms[i].st_value &= ~(target_ulong)1; 3482 #endif 3483 syms[i].st_value += load_bias; 3484 i++; 3485 } 3486 } 3487 3488 /* No "useful" symbol. */ 3489 if (nsyms == 0) { 3490 goto give_up; 3491 } 3492 3493 /* Attempt to free the storage associated with the local symbols 3494 that we threw away. Whether or not this has any effect on the 3495 memory allocation depends on the malloc implementation and how 3496 many symbols we managed to discard. */ 3497 new_syms = g_try_renew(struct elf_sym, syms, nsyms); 3498 if (new_syms == NULL) { 3499 goto give_up; 3500 } 3501 syms = new_syms; 3502 3503 qsort(syms, nsyms, sizeof(*syms), symcmp); 3504 3505 s->disas_num_syms = nsyms; 3506 #if ELF_CLASS == ELFCLASS32 3507 s->disas_symtab.elf32 = syms; 3508 #else 3509 s->disas_symtab.elf64 = syms; 3510 #endif 3511 s->lookup_symbol = lookup_symbolxx; 3512 s->next = syminfos; 3513 syminfos = s; 3514 3515 return; 3516 3517 give_up: 3518 g_free(s); 3519 g_free(strings); 3520 g_free(syms); 3521 } 3522 3523 uint32_t get_elf_eflags(int fd) 3524 { 3525 struct elfhdr ehdr; 3526 off_t offset; 3527 int ret; 3528 3529 /* Read ELF header */ 3530 offset = lseek(fd, 0, SEEK_SET); 3531 if (offset == (off_t) -1) { 3532 return 0; 3533 } 3534 ret = read(fd, &ehdr, sizeof(ehdr)); 3535 if (ret < sizeof(ehdr)) { 3536 return 0; 3537 } 3538 offset = lseek(fd, offset, SEEK_SET); 3539 if (offset == (off_t) -1) { 3540 return 0; 3541 } 3542 3543 /* Check ELF signature */ 3544 if (!elf_check_ident(&ehdr)) { 3545 return 0; 3546 } 3547 3548 /* check header */ 3549 bswap_ehdr(&ehdr); 3550 if (!elf_check_ehdr(&ehdr)) { 3551 return 0; 3552 } 3553 3554 /* return architecture id */ 3555 return ehdr.e_flags; 3556 } 3557 3558 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info) 3559 { 3560 struct image_info interp_info; 3561 struct elfhdr elf_ex; 3562 char *elf_interpreter = NULL; 3563 char *scratch; 3564 3565 memset(&interp_info, 0, sizeof(interp_info)); 3566 #ifdef TARGET_MIPS 3567 interp_info.fp_abi = MIPS_ABI_FP_UNKNOWN; 3568 #endif 3569 3570 info->start_mmap = (abi_ulong)ELF_START_MMAP; 3571 3572 load_elf_image(bprm->filename, bprm->fd, info, 3573 &elf_interpreter, bprm->buf); 3574 3575 /* ??? We need a copy of the elf header for passing to create_elf_tables. 3576 If we do nothing, we'll have overwritten this when we re-use bprm->buf 3577 when we load the interpreter. */ 3578 elf_ex = *(struct elfhdr *)bprm->buf; 3579 3580 /* Do this so that we can load the interpreter, if need be. We will 3581 change some of these later */ 3582 bprm->p = setup_arg_pages(bprm, info); 3583 3584 scratch = g_new0(char, TARGET_PAGE_SIZE); 3585 if (STACK_GROWS_DOWN) { 3586 bprm->p = copy_elf_strings(1, &bprm->filename, scratch, 3587 bprm->p, info->stack_limit); 3588 info->file_string = bprm->p; 3589 bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch, 3590 bprm->p, info->stack_limit); 3591 info->env_strings = bprm->p; 3592 bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch, 3593 bprm->p, info->stack_limit); 3594 info->arg_strings = bprm->p; 3595 } else { 3596 info->arg_strings = bprm->p; 3597 bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch, 3598 bprm->p, info->stack_limit); 3599 info->env_strings = bprm->p; 3600 bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch, 3601 bprm->p, info->stack_limit); 3602 info->file_string = bprm->p; 3603 bprm->p = copy_elf_strings(1, &bprm->filename, scratch, 3604 bprm->p, info->stack_limit); 3605 } 3606 3607 g_free(scratch); 3608 3609 if (!bprm->p) { 3610 fprintf(stderr, "%s: %s\n", bprm->filename, strerror(E2BIG)); 3611 exit(-1); 3612 } 3613 3614 if (elf_interpreter) { 3615 load_elf_interp(elf_interpreter, &interp_info, bprm->buf); 3616 3617 /* 3618 * While unusual because of ELF_ET_DYN_BASE, if we are unlucky 3619 * with the mappings the interpreter can be loaded above but 3620 * near the main executable, which can leave very little room 3621 * for the heap. 3622 * If the current brk has less than 16MB, use the end of the 3623 * interpreter. 3624 */ 3625 if (interp_info.brk > info->brk && 3626 interp_info.load_bias - info->brk < 16 * MiB) { 3627 info->brk = interp_info.brk; 3628 } 3629 3630 /* If the program interpreter is one of these two, then assume 3631 an iBCS2 image. Otherwise assume a native linux image. */ 3632 3633 if (strcmp(elf_interpreter, "/usr/lib/libc.so.1") == 0 3634 || strcmp(elf_interpreter, "/usr/lib/ld.so.1") == 0) { 3635 info->personality = PER_SVR4; 3636 3637 /* Why this, you ask??? Well SVr4 maps page 0 as read-only, 3638 and some applications "depend" upon this behavior. Since 3639 we do not have the power to recompile these, we emulate 3640 the SVr4 behavior. Sigh. */ 3641 target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC, 3642 MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 3643 } 3644 #ifdef TARGET_MIPS 3645 info->interp_fp_abi = interp_info.fp_abi; 3646 #endif 3647 } 3648 3649 /* 3650 * TODO: load a vdso, which would also contain the signal trampolines. 3651 * Otherwise, allocate a private page to hold them. 3652 */ 3653 if (TARGET_ARCH_HAS_SIGTRAMP_PAGE) { 3654 abi_long tramp_page = target_mmap(0, TARGET_PAGE_SIZE, 3655 PROT_READ | PROT_WRITE, 3656 MAP_PRIVATE | MAP_ANON, -1, 0); 3657 if (tramp_page == -1) { 3658 return -errno; 3659 } 3660 3661 setup_sigtramp(tramp_page); 3662 target_mprotect(tramp_page, TARGET_PAGE_SIZE, PROT_READ | PROT_EXEC); 3663 } 3664 3665 bprm->p = create_elf_tables(bprm->p, bprm->argc, bprm->envc, &elf_ex, 3666 info, (elf_interpreter ? &interp_info : NULL)); 3667 info->start_stack = bprm->p; 3668 3669 /* If we have an interpreter, set that as the program's entry point. 3670 Copy the load_bias as well, to help PPC64 interpret the entry 3671 point as a function descriptor. Do this after creating elf tables 3672 so that we copy the original program entry point into the AUXV. */ 3673 if (elf_interpreter) { 3674 info->load_bias = interp_info.load_bias; 3675 info->entry = interp_info.entry; 3676 g_free(elf_interpreter); 3677 } 3678 3679 #ifdef USE_ELF_CORE_DUMP 3680 bprm->core_dump = &elf_core_dump; 3681 #endif 3682 3683 return 0; 3684 } 3685 3686 #ifdef USE_ELF_CORE_DUMP 3687 /* 3688 * Definitions to generate Intel SVR4-like core files. 3689 * These mostly have the same names as the SVR4 types with "target_elf_" 3690 * tacked on the front to prevent clashes with linux definitions, 3691 * and the typedef forms have been avoided. This is mostly like 3692 * the SVR4 structure, but more Linuxy, with things that Linux does 3693 * not support and which gdb doesn't really use excluded. 3694 * 3695 * Fields we don't dump (their contents is zero) in linux-user qemu 3696 * are marked with XXX. 3697 * 3698 * Core dump code is copied from linux kernel (fs/binfmt_elf.c). 3699 * 3700 * Porting ELF coredump for target is (quite) simple process. First you 3701 * define USE_ELF_CORE_DUMP in target ELF code (where init_thread() for 3702 * the target resides): 3703 * 3704 * #define USE_ELF_CORE_DUMP 3705 * 3706 * Next you define type of register set used for dumping. ELF specification 3707 * says that it needs to be array of elf_greg_t that has size of ELF_NREG. 3708 * 3709 * typedef <target_regtype> target_elf_greg_t; 3710 * #define ELF_NREG <number of registers> 3711 * typedef taret_elf_greg_t target_elf_gregset_t[ELF_NREG]; 3712 * 3713 * Last step is to implement target specific function that copies registers 3714 * from given cpu into just specified register set. Prototype is: 3715 * 3716 * static void elf_core_copy_regs(taret_elf_gregset_t *regs, 3717 * const CPUArchState *env); 3718 * 3719 * Parameters: 3720 * regs - copy register values into here (allocated and zeroed by caller) 3721 * env - copy registers from here 3722 * 3723 * Example for ARM target is provided in this file. 3724 */ 3725 3726 /* An ELF note in memory */ 3727 struct memelfnote { 3728 const char *name; 3729 size_t namesz; 3730 size_t namesz_rounded; 3731 int type; 3732 size_t datasz; 3733 size_t datasz_rounded; 3734 void *data; 3735 size_t notesz; 3736 }; 3737 3738 struct target_elf_siginfo { 3739 abi_int si_signo; /* signal number */ 3740 abi_int si_code; /* extra code */ 3741 abi_int si_errno; /* errno */ 3742 }; 3743 3744 struct target_elf_prstatus { 3745 struct target_elf_siginfo pr_info; /* Info associated with signal */ 3746 abi_short pr_cursig; /* Current signal */ 3747 abi_ulong pr_sigpend; /* XXX */ 3748 abi_ulong pr_sighold; /* XXX */ 3749 target_pid_t pr_pid; 3750 target_pid_t pr_ppid; 3751 target_pid_t pr_pgrp; 3752 target_pid_t pr_sid; 3753 struct target_timeval pr_utime; /* XXX User time */ 3754 struct target_timeval pr_stime; /* XXX System time */ 3755 struct target_timeval pr_cutime; /* XXX Cumulative user time */ 3756 struct target_timeval pr_cstime; /* XXX Cumulative system time */ 3757 target_elf_gregset_t pr_reg; /* GP registers */ 3758 abi_int pr_fpvalid; /* XXX */ 3759 }; 3760 3761 #define ELF_PRARGSZ (80) /* Number of chars for args */ 3762 3763 struct target_elf_prpsinfo { 3764 char pr_state; /* numeric process state */ 3765 char pr_sname; /* char for pr_state */ 3766 char pr_zomb; /* zombie */ 3767 char pr_nice; /* nice val */ 3768 abi_ulong pr_flag; /* flags */ 3769 target_uid_t pr_uid; 3770 target_gid_t pr_gid; 3771 target_pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid; 3772 /* Lots missing */ 3773 char pr_fname[16] QEMU_NONSTRING; /* filename of executable */ 3774 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */ 3775 }; 3776 3777 /* Here is the structure in which status of each thread is captured. */ 3778 struct elf_thread_status { 3779 QTAILQ_ENTRY(elf_thread_status) ets_link; 3780 struct target_elf_prstatus prstatus; /* NT_PRSTATUS */ 3781 #if 0 3782 elf_fpregset_t fpu; /* NT_PRFPREG */ 3783 struct task_struct *thread; 3784 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ 3785 #endif 3786 struct memelfnote notes[1]; 3787 int num_notes; 3788 }; 3789 3790 struct elf_note_info { 3791 struct memelfnote *notes; 3792 struct target_elf_prstatus *prstatus; /* NT_PRSTATUS */ 3793 struct target_elf_prpsinfo *psinfo; /* NT_PRPSINFO */ 3794 3795 QTAILQ_HEAD(, elf_thread_status) thread_list; 3796 #if 0 3797 /* 3798 * Current version of ELF coredump doesn't support 3799 * dumping fp regs etc. 3800 */ 3801 elf_fpregset_t *fpu; 3802 elf_fpxregset_t *xfpu; 3803 int thread_status_size; 3804 #endif 3805 int notes_size; 3806 int numnote; 3807 }; 3808 3809 struct vm_area_struct { 3810 target_ulong vma_start; /* start vaddr of memory region */ 3811 target_ulong vma_end; /* end vaddr of memory region */ 3812 abi_ulong vma_flags; /* protection etc. flags for the region */ 3813 QTAILQ_ENTRY(vm_area_struct) vma_link; 3814 }; 3815 3816 struct mm_struct { 3817 QTAILQ_HEAD(, vm_area_struct) mm_mmap; 3818 int mm_count; /* number of mappings */ 3819 }; 3820 3821 static struct mm_struct *vma_init(void); 3822 static void vma_delete(struct mm_struct *); 3823 static int vma_add_mapping(struct mm_struct *, target_ulong, 3824 target_ulong, abi_ulong); 3825 static int vma_get_mapping_count(const struct mm_struct *); 3826 static struct vm_area_struct *vma_first(const struct mm_struct *); 3827 static struct vm_area_struct *vma_next(struct vm_area_struct *); 3828 static abi_ulong vma_dump_size(const struct vm_area_struct *); 3829 static int vma_walker(void *priv, target_ulong start, target_ulong end, 3830 unsigned long flags); 3831 3832 static void fill_elf_header(struct elfhdr *, int, uint16_t, uint32_t); 3833 static void fill_note(struct memelfnote *, const char *, int, 3834 unsigned int, void *); 3835 static void fill_prstatus(struct target_elf_prstatus *, const TaskState *, int); 3836 static int fill_psinfo(struct target_elf_prpsinfo *, const TaskState *); 3837 static void fill_auxv_note(struct memelfnote *, const TaskState *); 3838 static void fill_elf_note_phdr(struct elf_phdr *, int, off_t); 3839 static size_t note_size(const struct memelfnote *); 3840 static void free_note_info(struct elf_note_info *); 3841 static int fill_note_info(struct elf_note_info *, long, const CPUArchState *); 3842 static void fill_thread_info(struct elf_note_info *, const CPUArchState *); 3843 3844 static int dump_write(int, const void *, size_t); 3845 static int write_note(struct memelfnote *, int); 3846 static int write_note_info(struct elf_note_info *, int); 3847 3848 #ifdef BSWAP_NEEDED 3849 static void bswap_prstatus(struct target_elf_prstatus *prstatus) 3850 { 3851 prstatus->pr_info.si_signo = tswap32(prstatus->pr_info.si_signo); 3852 prstatus->pr_info.si_code = tswap32(prstatus->pr_info.si_code); 3853 prstatus->pr_info.si_errno = tswap32(prstatus->pr_info.si_errno); 3854 prstatus->pr_cursig = tswap16(prstatus->pr_cursig); 3855 prstatus->pr_sigpend = tswapal(prstatus->pr_sigpend); 3856 prstatus->pr_sighold = tswapal(prstatus->pr_sighold); 3857 prstatus->pr_pid = tswap32(prstatus->pr_pid); 3858 prstatus->pr_ppid = tswap32(prstatus->pr_ppid); 3859 prstatus->pr_pgrp = tswap32(prstatus->pr_pgrp); 3860 prstatus->pr_sid = tswap32(prstatus->pr_sid); 3861 /* cpu times are not filled, so we skip them */ 3862 /* regs should be in correct format already */ 3863 prstatus->pr_fpvalid = tswap32(prstatus->pr_fpvalid); 3864 } 3865 3866 static void bswap_psinfo(struct target_elf_prpsinfo *psinfo) 3867 { 3868 psinfo->pr_flag = tswapal(psinfo->pr_flag); 3869 psinfo->pr_uid = tswap16(psinfo->pr_uid); 3870 psinfo->pr_gid = tswap16(psinfo->pr_gid); 3871 psinfo->pr_pid = tswap32(psinfo->pr_pid); 3872 psinfo->pr_ppid = tswap32(psinfo->pr_ppid); 3873 psinfo->pr_pgrp = tswap32(psinfo->pr_pgrp); 3874 psinfo->pr_sid = tswap32(psinfo->pr_sid); 3875 } 3876 3877 static void bswap_note(struct elf_note *en) 3878 { 3879 bswap32s(&en->n_namesz); 3880 bswap32s(&en->n_descsz); 3881 bswap32s(&en->n_type); 3882 } 3883 #else 3884 static inline void bswap_prstatus(struct target_elf_prstatus *p) { } 3885 static inline void bswap_psinfo(struct target_elf_prpsinfo *p) {} 3886 static inline void bswap_note(struct elf_note *en) { } 3887 #endif /* BSWAP_NEEDED */ 3888 3889 /* 3890 * Minimal support for linux memory regions. These are needed 3891 * when we are finding out what memory exactly belongs to 3892 * emulated process. No locks needed here, as long as 3893 * thread that received the signal is stopped. 3894 */ 3895 3896 static struct mm_struct *vma_init(void) 3897 { 3898 struct mm_struct *mm; 3899 3900 if ((mm = g_malloc(sizeof (*mm))) == NULL) 3901 return (NULL); 3902 3903 mm->mm_count = 0; 3904 QTAILQ_INIT(&mm->mm_mmap); 3905 3906 return (mm); 3907 } 3908 3909 static void vma_delete(struct mm_struct *mm) 3910 { 3911 struct vm_area_struct *vma; 3912 3913 while ((vma = vma_first(mm)) != NULL) { 3914 QTAILQ_REMOVE(&mm->mm_mmap, vma, vma_link); 3915 g_free(vma); 3916 } 3917 g_free(mm); 3918 } 3919 3920 static int vma_add_mapping(struct mm_struct *mm, target_ulong start, 3921 target_ulong end, abi_ulong flags) 3922 { 3923 struct vm_area_struct *vma; 3924 3925 if ((vma = g_malloc0(sizeof (*vma))) == NULL) 3926 return (-1); 3927 3928 vma->vma_start = start; 3929 vma->vma_end = end; 3930 vma->vma_flags = flags; 3931 3932 QTAILQ_INSERT_TAIL(&mm->mm_mmap, vma, vma_link); 3933 mm->mm_count++; 3934 3935 return (0); 3936 } 3937 3938 static struct vm_area_struct *vma_first(const struct mm_struct *mm) 3939 { 3940 return (QTAILQ_FIRST(&mm->mm_mmap)); 3941 } 3942 3943 static struct vm_area_struct *vma_next(struct vm_area_struct *vma) 3944 { 3945 return (QTAILQ_NEXT(vma, vma_link)); 3946 } 3947 3948 static int vma_get_mapping_count(const struct mm_struct *mm) 3949 { 3950 return (mm->mm_count); 3951 } 3952 3953 /* 3954 * Calculate file (dump) size of given memory region. 3955 */ 3956 static abi_ulong vma_dump_size(const struct vm_area_struct *vma) 3957 { 3958 /* if we cannot even read the first page, skip it */ 3959 if (!access_ok_untagged(VERIFY_READ, vma->vma_start, TARGET_PAGE_SIZE)) 3960 return (0); 3961 3962 /* 3963 * Usually we don't dump executable pages as they contain 3964 * non-writable code that debugger can read directly from 3965 * target library etc. However, thread stacks are marked 3966 * also executable so we read in first page of given region 3967 * and check whether it contains elf header. If there is 3968 * no elf header, we dump it. 3969 */ 3970 if (vma->vma_flags & PROT_EXEC) { 3971 char page[TARGET_PAGE_SIZE]; 3972 3973 if (copy_from_user(page, vma->vma_start, sizeof (page))) { 3974 return 0; 3975 } 3976 if ((page[EI_MAG0] == ELFMAG0) && 3977 (page[EI_MAG1] == ELFMAG1) && 3978 (page[EI_MAG2] == ELFMAG2) && 3979 (page[EI_MAG3] == ELFMAG3)) { 3980 /* 3981 * Mappings are possibly from ELF binary. Don't dump 3982 * them. 3983 */ 3984 return (0); 3985 } 3986 } 3987 3988 return (vma->vma_end - vma->vma_start); 3989 } 3990 3991 static int vma_walker(void *priv, target_ulong start, target_ulong end, 3992 unsigned long flags) 3993 { 3994 struct mm_struct *mm = (struct mm_struct *)priv; 3995 3996 vma_add_mapping(mm, start, end, flags); 3997 return (0); 3998 } 3999 4000 static void fill_note(struct memelfnote *note, const char *name, int type, 4001 unsigned int sz, void *data) 4002 { 4003 unsigned int namesz; 4004 4005 namesz = strlen(name) + 1; 4006 note->name = name; 4007 note->namesz = namesz; 4008 note->namesz_rounded = roundup(namesz, sizeof (int32_t)); 4009 note->type = type; 4010 note->datasz = sz; 4011 note->datasz_rounded = roundup(sz, sizeof (int32_t)); 4012 4013 note->data = data; 4014 4015 /* 4016 * We calculate rounded up note size here as specified by 4017 * ELF document. 4018 */ 4019 note->notesz = sizeof (struct elf_note) + 4020 note->namesz_rounded + note->datasz_rounded; 4021 } 4022 4023 static void fill_elf_header(struct elfhdr *elf, int segs, uint16_t machine, 4024 uint32_t flags) 4025 { 4026 (void) memset(elf, 0, sizeof(*elf)); 4027 4028 (void) memcpy(elf->e_ident, ELFMAG, SELFMAG); 4029 elf->e_ident[EI_CLASS] = ELF_CLASS; 4030 elf->e_ident[EI_DATA] = ELF_DATA; 4031 elf->e_ident[EI_VERSION] = EV_CURRENT; 4032 elf->e_ident[EI_OSABI] = ELF_OSABI; 4033 4034 elf->e_type = ET_CORE; 4035 elf->e_machine = machine; 4036 elf->e_version = EV_CURRENT; 4037 elf->e_phoff = sizeof(struct elfhdr); 4038 elf->e_flags = flags; 4039 elf->e_ehsize = sizeof(struct elfhdr); 4040 elf->e_phentsize = sizeof(struct elf_phdr); 4041 elf->e_phnum = segs; 4042 4043 bswap_ehdr(elf); 4044 } 4045 4046 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset) 4047 { 4048 phdr->p_type = PT_NOTE; 4049 phdr->p_offset = offset; 4050 phdr->p_vaddr = 0; 4051 phdr->p_paddr = 0; 4052 phdr->p_filesz = sz; 4053 phdr->p_memsz = 0; 4054 phdr->p_flags = 0; 4055 phdr->p_align = 0; 4056 4057 bswap_phdr(phdr, 1); 4058 } 4059 4060 static size_t note_size(const struct memelfnote *note) 4061 { 4062 return (note->notesz); 4063 } 4064 4065 static void fill_prstatus(struct target_elf_prstatus *prstatus, 4066 const TaskState *ts, int signr) 4067 { 4068 (void) memset(prstatus, 0, sizeof (*prstatus)); 4069 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; 4070 prstatus->pr_pid = ts->ts_tid; 4071 prstatus->pr_ppid = getppid(); 4072 prstatus->pr_pgrp = getpgrp(); 4073 prstatus->pr_sid = getsid(0); 4074 4075 bswap_prstatus(prstatus); 4076 } 4077 4078 static int fill_psinfo(struct target_elf_prpsinfo *psinfo, const TaskState *ts) 4079 { 4080 char *base_filename; 4081 unsigned int i, len; 4082 4083 (void) memset(psinfo, 0, sizeof (*psinfo)); 4084 4085 len = ts->info->env_strings - ts->info->arg_strings; 4086 if (len >= ELF_PRARGSZ) 4087 len = ELF_PRARGSZ - 1; 4088 if (copy_from_user(&psinfo->pr_psargs, ts->info->arg_strings, len)) { 4089 return -EFAULT; 4090 } 4091 for (i = 0; i < len; i++) 4092 if (psinfo->pr_psargs[i] == 0) 4093 psinfo->pr_psargs[i] = ' '; 4094 psinfo->pr_psargs[len] = 0; 4095 4096 psinfo->pr_pid = getpid(); 4097 psinfo->pr_ppid = getppid(); 4098 psinfo->pr_pgrp = getpgrp(); 4099 psinfo->pr_sid = getsid(0); 4100 psinfo->pr_uid = getuid(); 4101 psinfo->pr_gid = getgid(); 4102 4103 base_filename = g_path_get_basename(ts->bprm->filename); 4104 /* 4105 * Using strncpy here is fine: at max-length, 4106 * this field is not NUL-terminated. 4107 */ 4108 (void) strncpy(psinfo->pr_fname, base_filename, 4109 sizeof(psinfo->pr_fname)); 4110 4111 g_free(base_filename); 4112 bswap_psinfo(psinfo); 4113 return (0); 4114 } 4115 4116 static void fill_auxv_note(struct memelfnote *note, const TaskState *ts) 4117 { 4118 elf_addr_t auxv = (elf_addr_t)ts->info->saved_auxv; 4119 elf_addr_t orig_auxv = auxv; 4120 void *ptr; 4121 int len = ts->info->auxv_len; 4122 4123 /* 4124 * Auxiliary vector is stored in target process stack. It contains 4125 * {type, value} pairs that we need to dump into note. This is not 4126 * strictly necessary but we do it here for sake of completeness. 4127 */ 4128 4129 /* read in whole auxv vector and copy it to memelfnote */ 4130 ptr = lock_user(VERIFY_READ, orig_auxv, len, 0); 4131 if (ptr != NULL) { 4132 fill_note(note, "CORE", NT_AUXV, len, ptr); 4133 unlock_user(ptr, auxv, len); 4134 } 4135 } 4136 4137 /* 4138 * Constructs name of coredump file. We have following convention 4139 * for the name: 4140 * qemu_<basename-of-target-binary>_<date>-<time>_<pid>.core 4141 * 4142 * Returns the filename 4143 */ 4144 static char *core_dump_filename(const TaskState *ts) 4145 { 4146 g_autoptr(GDateTime) now = g_date_time_new_now_local(); 4147 g_autofree char *nowstr = g_date_time_format(now, "%Y%m%d-%H%M%S"); 4148 g_autofree char *base_filename = g_path_get_basename(ts->bprm->filename); 4149 4150 return g_strdup_printf("qemu_%s_%s_%d.core", 4151 base_filename, nowstr, (int)getpid()); 4152 } 4153 4154 static int dump_write(int fd, const void *ptr, size_t size) 4155 { 4156 const char *bufp = (const char *)ptr; 4157 ssize_t bytes_written, bytes_left; 4158 struct rlimit dumpsize; 4159 off_t pos; 4160 4161 bytes_written = 0; 4162 getrlimit(RLIMIT_CORE, &dumpsize); 4163 if ((pos = lseek(fd, 0, SEEK_CUR))==-1) { 4164 if (errno == ESPIPE) { /* not a seekable stream */ 4165 bytes_left = size; 4166 } else { 4167 return pos; 4168 } 4169 } else { 4170 if (dumpsize.rlim_cur <= pos) { 4171 return -1; 4172 } else if (dumpsize.rlim_cur == RLIM_INFINITY) { 4173 bytes_left = size; 4174 } else { 4175 size_t limit_left=dumpsize.rlim_cur - pos; 4176 bytes_left = limit_left >= size ? size : limit_left ; 4177 } 4178 } 4179 4180 /* 4181 * In normal conditions, single write(2) should do but 4182 * in case of socket etc. this mechanism is more portable. 4183 */ 4184 do { 4185 bytes_written = write(fd, bufp, bytes_left); 4186 if (bytes_written < 0) { 4187 if (errno == EINTR) 4188 continue; 4189 return (-1); 4190 } else if (bytes_written == 0) { /* eof */ 4191 return (-1); 4192 } 4193 bufp += bytes_written; 4194 bytes_left -= bytes_written; 4195 } while (bytes_left > 0); 4196 4197 return (0); 4198 } 4199 4200 static int write_note(struct memelfnote *men, int fd) 4201 { 4202 struct elf_note en; 4203 4204 en.n_namesz = men->namesz; 4205 en.n_type = men->type; 4206 en.n_descsz = men->datasz; 4207 4208 bswap_note(&en); 4209 4210 if (dump_write(fd, &en, sizeof(en)) != 0) 4211 return (-1); 4212 if (dump_write(fd, men->name, men->namesz_rounded) != 0) 4213 return (-1); 4214 if (dump_write(fd, men->data, men->datasz_rounded) != 0) 4215 return (-1); 4216 4217 return (0); 4218 } 4219 4220 static void fill_thread_info(struct elf_note_info *info, const CPUArchState *env) 4221 { 4222 CPUState *cpu = env_cpu((CPUArchState *)env); 4223 TaskState *ts = (TaskState *)cpu->opaque; 4224 struct elf_thread_status *ets; 4225 4226 ets = g_malloc0(sizeof (*ets)); 4227 ets->num_notes = 1; /* only prstatus is dumped */ 4228 fill_prstatus(&ets->prstatus, ts, 0); 4229 elf_core_copy_regs(&ets->prstatus.pr_reg, env); 4230 fill_note(&ets->notes[0], "CORE", NT_PRSTATUS, sizeof (ets->prstatus), 4231 &ets->prstatus); 4232 4233 QTAILQ_INSERT_TAIL(&info->thread_list, ets, ets_link); 4234 4235 info->notes_size += note_size(&ets->notes[0]); 4236 } 4237 4238 static void init_note_info(struct elf_note_info *info) 4239 { 4240 /* Initialize the elf_note_info structure so that it is at 4241 * least safe to call free_note_info() on it. Must be 4242 * called before calling fill_note_info(). 4243 */ 4244 memset(info, 0, sizeof (*info)); 4245 QTAILQ_INIT(&info->thread_list); 4246 } 4247 4248 static int fill_note_info(struct elf_note_info *info, 4249 long signr, const CPUArchState *env) 4250 { 4251 #define NUMNOTES 3 4252 CPUState *cpu = env_cpu((CPUArchState *)env); 4253 TaskState *ts = (TaskState *)cpu->opaque; 4254 int i; 4255 4256 info->notes = g_new0(struct memelfnote, NUMNOTES); 4257 if (info->notes == NULL) 4258 return (-ENOMEM); 4259 info->prstatus = g_malloc0(sizeof (*info->prstatus)); 4260 if (info->prstatus == NULL) 4261 return (-ENOMEM); 4262 info->psinfo = g_malloc0(sizeof (*info->psinfo)); 4263 if (info->prstatus == NULL) 4264 return (-ENOMEM); 4265 4266 /* 4267 * First fill in status (and registers) of current thread 4268 * including process info & aux vector. 4269 */ 4270 fill_prstatus(info->prstatus, ts, signr); 4271 elf_core_copy_regs(&info->prstatus->pr_reg, env); 4272 fill_note(&info->notes[0], "CORE", NT_PRSTATUS, 4273 sizeof (*info->prstatus), info->prstatus); 4274 fill_psinfo(info->psinfo, ts); 4275 fill_note(&info->notes[1], "CORE", NT_PRPSINFO, 4276 sizeof (*info->psinfo), info->psinfo); 4277 fill_auxv_note(&info->notes[2], ts); 4278 info->numnote = 3; 4279 4280 info->notes_size = 0; 4281 for (i = 0; i < info->numnote; i++) 4282 info->notes_size += note_size(&info->notes[i]); 4283 4284 /* read and fill status of all threads */ 4285 WITH_QEMU_LOCK_GUARD(&qemu_cpu_list_lock) { 4286 CPU_FOREACH(cpu) { 4287 if (cpu == thread_cpu) { 4288 continue; 4289 } 4290 fill_thread_info(info, cpu->env_ptr); 4291 } 4292 } 4293 4294 return (0); 4295 } 4296 4297 static void free_note_info(struct elf_note_info *info) 4298 { 4299 struct elf_thread_status *ets; 4300 4301 while (!QTAILQ_EMPTY(&info->thread_list)) { 4302 ets = QTAILQ_FIRST(&info->thread_list); 4303 QTAILQ_REMOVE(&info->thread_list, ets, ets_link); 4304 g_free(ets); 4305 } 4306 4307 g_free(info->prstatus); 4308 g_free(info->psinfo); 4309 g_free(info->notes); 4310 } 4311 4312 static int write_note_info(struct elf_note_info *info, int fd) 4313 { 4314 struct elf_thread_status *ets; 4315 int i, error = 0; 4316 4317 /* write prstatus, psinfo and auxv for current thread */ 4318 for (i = 0; i < info->numnote; i++) 4319 if ((error = write_note(&info->notes[i], fd)) != 0) 4320 return (error); 4321 4322 /* write prstatus for each thread */ 4323 QTAILQ_FOREACH(ets, &info->thread_list, ets_link) { 4324 if ((error = write_note(&ets->notes[0], fd)) != 0) 4325 return (error); 4326 } 4327 4328 return (0); 4329 } 4330 4331 /* 4332 * Write out ELF coredump. 4333 * 4334 * See documentation of ELF object file format in: 4335 * http://www.caldera.com/developers/devspecs/gabi41.pdf 4336 * 4337 * Coredump format in linux is following: 4338 * 4339 * 0 +----------------------+ \ 4340 * | ELF header | ET_CORE | 4341 * +----------------------+ | 4342 * | ELF program headers | |--- headers 4343 * | - NOTE section | | 4344 * | - PT_LOAD sections | | 4345 * +----------------------+ / 4346 * | NOTEs: | 4347 * | - NT_PRSTATUS | 4348 * | - NT_PRSINFO | 4349 * | - NT_AUXV | 4350 * +----------------------+ <-- aligned to target page 4351 * | Process memory dump | 4352 * : : 4353 * . . 4354 * : : 4355 * | | 4356 * +----------------------+ 4357 * 4358 * NT_PRSTATUS -> struct elf_prstatus (per thread) 4359 * NT_PRSINFO -> struct elf_prpsinfo 4360 * NT_AUXV is array of { type, value } pairs (see fill_auxv_note()). 4361 * 4362 * Format follows System V format as close as possible. Current 4363 * version limitations are as follows: 4364 * - no floating point registers are dumped 4365 * 4366 * Function returns 0 in case of success, negative errno otherwise. 4367 * 4368 * TODO: make this work also during runtime: it should be 4369 * possible to force coredump from running process and then 4370 * continue processing. For example qemu could set up SIGUSR2 4371 * handler (provided that target process haven't registered 4372 * handler for that) that does the dump when signal is received. 4373 */ 4374 static int elf_core_dump(int signr, const CPUArchState *env) 4375 { 4376 const CPUState *cpu = env_cpu((CPUArchState *)env); 4377 const TaskState *ts = (const TaskState *)cpu->opaque; 4378 struct vm_area_struct *vma = NULL; 4379 g_autofree char *corefile = NULL; 4380 struct elf_note_info info; 4381 struct elfhdr elf; 4382 struct elf_phdr phdr; 4383 struct rlimit dumpsize; 4384 struct mm_struct *mm = NULL; 4385 off_t offset = 0, data_offset = 0; 4386 int segs = 0; 4387 int fd = -1; 4388 4389 init_note_info(&info); 4390 4391 errno = 0; 4392 getrlimit(RLIMIT_CORE, &dumpsize); 4393 if (dumpsize.rlim_cur == 0) 4394 return 0; 4395 4396 corefile = core_dump_filename(ts); 4397 4398 if ((fd = open(corefile, O_WRONLY | O_CREAT, 4399 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0) 4400 return (-errno); 4401 4402 /* 4403 * Walk through target process memory mappings and 4404 * set up structure containing this information. After 4405 * this point vma_xxx functions can be used. 4406 */ 4407 if ((mm = vma_init()) == NULL) 4408 goto out; 4409 4410 walk_memory_regions(mm, vma_walker); 4411 segs = vma_get_mapping_count(mm); 4412 4413 /* 4414 * Construct valid coredump ELF header. We also 4415 * add one more segment for notes. 4416 */ 4417 fill_elf_header(&elf, segs + 1, ELF_MACHINE, 0); 4418 if (dump_write(fd, &elf, sizeof (elf)) != 0) 4419 goto out; 4420 4421 /* fill in the in-memory version of notes */ 4422 if (fill_note_info(&info, signr, env) < 0) 4423 goto out; 4424 4425 offset += sizeof (elf); /* elf header */ 4426 offset += (segs + 1) * sizeof (struct elf_phdr); /* program headers */ 4427 4428 /* write out notes program header */ 4429 fill_elf_note_phdr(&phdr, info.notes_size, offset); 4430 4431 offset += info.notes_size; 4432 if (dump_write(fd, &phdr, sizeof (phdr)) != 0) 4433 goto out; 4434 4435 /* 4436 * ELF specification wants data to start at page boundary so 4437 * we align it here. 4438 */ 4439 data_offset = offset = roundup(offset, ELF_EXEC_PAGESIZE); 4440 4441 /* 4442 * Write program headers for memory regions mapped in 4443 * the target process. 4444 */ 4445 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) { 4446 (void) memset(&phdr, 0, sizeof (phdr)); 4447 4448 phdr.p_type = PT_LOAD; 4449 phdr.p_offset = offset; 4450 phdr.p_vaddr = vma->vma_start; 4451 phdr.p_paddr = 0; 4452 phdr.p_filesz = vma_dump_size(vma); 4453 offset += phdr.p_filesz; 4454 phdr.p_memsz = vma->vma_end - vma->vma_start; 4455 phdr.p_flags = vma->vma_flags & PROT_READ ? PF_R : 0; 4456 if (vma->vma_flags & PROT_WRITE) 4457 phdr.p_flags |= PF_W; 4458 if (vma->vma_flags & PROT_EXEC) 4459 phdr.p_flags |= PF_X; 4460 phdr.p_align = ELF_EXEC_PAGESIZE; 4461 4462 bswap_phdr(&phdr, 1); 4463 if (dump_write(fd, &phdr, sizeof(phdr)) != 0) { 4464 goto out; 4465 } 4466 } 4467 4468 /* 4469 * Next we write notes just after program headers. No 4470 * alignment needed here. 4471 */ 4472 if (write_note_info(&info, fd) < 0) 4473 goto out; 4474 4475 /* align data to page boundary */ 4476 if (lseek(fd, data_offset, SEEK_SET) != data_offset) 4477 goto out; 4478 4479 /* 4480 * Finally we can dump process memory into corefile as well. 4481 */ 4482 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) { 4483 abi_ulong addr; 4484 abi_ulong end; 4485 4486 end = vma->vma_start + vma_dump_size(vma); 4487 4488 for (addr = vma->vma_start; addr < end; 4489 addr += TARGET_PAGE_SIZE) { 4490 char page[TARGET_PAGE_SIZE]; 4491 int error; 4492 4493 /* 4494 * Read in page from target process memory and 4495 * write it to coredump file. 4496 */ 4497 error = copy_from_user(page, addr, sizeof (page)); 4498 if (error != 0) { 4499 (void) fprintf(stderr, "unable to dump " TARGET_ABI_FMT_lx "\n", 4500 addr); 4501 errno = -error; 4502 goto out; 4503 } 4504 if (dump_write(fd, page, TARGET_PAGE_SIZE) < 0) 4505 goto out; 4506 } 4507 } 4508 4509 out: 4510 free_note_info(&info); 4511 if (mm != NULL) 4512 vma_delete(mm); 4513 (void) close(fd); 4514 4515 if (errno != 0) 4516 return (-errno); 4517 return (0); 4518 } 4519 #endif /* USE_ELF_CORE_DUMP */ 4520 4521 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop) 4522 { 4523 init_thread(regs, infop); 4524 } 4525