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 7 #include "qemu.h" 8 #include "disas/disas.h" 9 #include "qemu/path.h" 10 11 #ifdef _ARCH_PPC64 12 #undef ARCH_DLINFO 13 #undef ELF_PLATFORM 14 #undef ELF_HWCAP 15 #undef ELF_HWCAP2 16 #undef ELF_CLASS 17 #undef ELF_DATA 18 #undef ELF_ARCH 19 #endif 20 21 #define ELF_OSABI ELFOSABI_SYSV 22 23 /* from personality.h */ 24 25 /* 26 * Flags for bug emulation. 27 * 28 * These occupy the top three bytes. 29 */ 30 enum { 31 ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */ 32 FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to 33 descriptors (signal handling) */ 34 MMAP_PAGE_ZERO = 0x0100000, 35 ADDR_COMPAT_LAYOUT = 0x0200000, 36 READ_IMPLIES_EXEC = 0x0400000, 37 ADDR_LIMIT_32BIT = 0x0800000, 38 SHORT_INODE = 0x1000000, 39 WHOLE_SECONDS = 0x2000000, 40 STICKY_TIMEOUTS = 0x4000000, 41 ADDR_LIMIT_3GB = 0x8000000, 42 }; 43 44 /* 45 * Personality types. 46 * 47 * These go in the low byte. Avoid using the top bit, it will 48 * conflict with error returns. 49 */ 50 enum { 51 PER_LINUX = 0x0000, 52 PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT, 53 PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS, 54 PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO, 55 PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE, 56 PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS | SHORT_INODE, 57 PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS, 58 PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE, 59 PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS, 60 PER_BSD = 0x0006, 61 PER_SUNOS = 0x0006 | STICKY_TIMEOUTS, 62 PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE, 63 PER_LINUX32 = 0x0008, 64 PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB, 65 PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */ 66 PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */ 67 PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */ 68 PER_RISCOS = 0x000c, 69 PER_SOLARIS = 0x000d | STICKY_TIMEOUTS, 70 PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO, 71 PER_OSF4 = 0x000f, /* OSF/1 v4 */ 72 PER_HPUX = 0x0010, 73 PER_MASK = 0x00ff, 74 }; 75 76 /* 77 * Return the base personality without flags. 78 */ 79 #define personality(pers) (pers & PER_MASK) 80 81 int info_is_fdpic(struct image_info *info) 82 { 83 return info->personality == PER_LINUX_FDPIC; 84 } 85 86 /* this flag is uneffective under linux too, should be deleted */ 87 #ifndef MAP_DENYWRITE 88 #define MAP_DENYWRITE 0 89 #endif 90 91 /* should probably go in elf.h */ 92 #ifndef ELIBBAD 93 #define ELIBBAD 80 94 #endif 95 96 #ifdef TARGET_WORDS_BIGENDIAN 97 #define ELF_DATA ELFDATA2MSB 98 #else 99 #define ELF_DATA ELFDATA2LSB 100 #endif 101 102 #ifdef TARGET_ABI_MIPSN32 103 typedef abi_ullong target_elf_greg_t; 104 #define tswapreg(ptr) tswap64(ptr) 105 #else 106 typedef abi_ulong target_elf_greg_t; 107 #define tswapreg(ptr) tswapal(ptr) 108 #endif 109 110 #ifdef USE_UID16 111 typedef abi_ushort target_uid_t; 112 typedef abi_ushort target_gid_t; 113 #else 114 typedef abi_uint target_uid_t; 115 typedef abi_uint target_gid_t; 116 #endif 117 typedef abi_int target_pid_t; 118 119 #ifdef TARGET_I386 120 121 #define ELF_PLATFORM get_elf_platform() 122 123 static const char *get_elf_platform(void) 124 { 125 static char elf_platform[] = "i386"; 126 int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL); 127 if (family > 6) 128 family = 6; 129 if (family >= 3) 130 elf_platform[1] = '0' + family; 131 return elf_platform; 132 } 133 134 #define ELF_HWCAP get_elf_hwcap() 135 136 static uint32_t get_elf_hwcap(void) 137 { 138 X86CPU *cpu = X86_CPU(thread_cpu); 139 140 return cpu->env.features[FEAT_1_EDX]; 141 } 142 143 #ifdef TARGET_X86_64 144 #define ELF_START_MMAP 0x2aaaaab000ULL 145 146 #define ELF_CLASS ELFCLASS64 147 #define ELF_ARCH EM_X86_64 148 149 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) 150 { 151 regs->rax = 0; 152 regs->rsp = infop->start_stack; 153 regs->rip = infop->entry; 154 } 155 156 #define ELF_NREG 27 157 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 158 159 /* 160 * Note that ELF_NREG should be 29 as there should be place for 161 * TRAPNO and ERR "registers" as well but linux doesn't dump 162 * those. 163 * 164 * See linux kernel: arch/x86/include/asm/elf.h 165 */ 166 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env) 167 { 168 (*regs)[0] = env->regs[15]; 169 (*regs)[1] = env->regs[14]; 170 (*regs)[2] = env->regs[13]; 171 (*regs)[3] = env->regs[12]; 172 (*regs)[4] = env->regs[R_EBP]; 173 (*regs)[5] = env->regs[R_EBX]; 174 (*regs)[6] = env->regs[11]; 175 (*regs)[7] = env->regs[10]; 176 (*regs)[8] = env->regs[9]; 177 (*regs)[9] = env->regs[8]; 178 (*regs)[10] = env->regs[R_EAX]; 179 (*regs)[11] = env->regs[R_ECX]; 180 (*regs)[12] = env->regs[R_EDX]; 181 (*regs)[13] = env->regs[R_ESI]; 182 (*regs)[14] = env->regs[R_EDI]; 183 (*regs)[15] = env->regs[R_EAX]; /* XXX */ 184 (*regs)[16] = env->eip; 185 (*regs)[17] = env->segs[R_CS].selector & 0xffff; 186 (*regs)[18] = env->eflags; 187 (*regs)[19] = env->regs[R_ESP]; 188 (*regs)[20] = env->segs[R_SS].selector & 0xffff; 189 (*regs)[21] = env->segs[R_FS].selector & 0xffff; 190 (*regs)[22] = env->segs[R_GS].selector & 0xffff; 191 (*regs)[23] = env->segs[R_DS].selector & 0xffff; 192 (*regs)[24] = env->segs[R_ES].selector & 0xffff; 193 (*regs)[25] = env->segs[R_FS].selector & 0xffff; 194 (*regs)[26] = env->segs[R_GS].selector & 0xffff; 195 } 196 197 #else 198 199 #define ELF_START_MMAP 0x80000000 200 201 /* 202 * This is used to ensure we don't load something for the wrong architecture. 203 */ 204 #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) ) 205 206 /* 207 * These are used to set parameters in the core dumps. 208 */ 209 #define ELF_CLASS ELFCLASS32 210 #define ELF_ARCH EM_386 211 212 static inline void init_thread(struct target_pt_regs *regs, 213 struct image_info *infop) 214 { 215 regs->esp = infop->start_stack; 216 regs->eip = infop->entry; 217 218 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program 219 starts %edx contains a pointer to a function which might be 220 registered using `atexit'. This provides a mean for the 221 dynamic linker to call DT_FINI functions for shared libraries 222 that have been loaded before the code runs. 223 224 A value of 0 tells we have no such handler. */ 225 regs->edx = 0; 226 } 227 228 #define ELF_NREG 17 229 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 230 231 /* 232 * Note that ELF_NREG should be 19 as there should be place for 233 * TRAPNO and ERR "registers" as well but linux doesn't dump 234 * those. 235 * 236 * See linux kernel: arch/x86/include/asm/elf.h 237 */ 238 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env) 239 { 240 (*regs)[0] = env->regs[R_EBX]; 241 (*regs)[1] = env->regs[R_ECX]; 242 (*regs)[2] = env->regs[R_EDX]; 243 (*regs)[3] = env->regs[R_ESI]; 244 (*regs)[4] = env->regs[R_EDI]; 245 (*regs)[5] = env->regs[R_EBP]; 246 (*regs)[6] = env->regs[R_EAX]; 247 (*regs)[7] = env->segs[R_DS].selector & 0xffff; 248 (*regs)[8] = env->segs[R_ES].selector & 0xffff; 249 (*regs)[9] = env->segs[R_FS].selector & 0xffff; 250 (*regs)[10] = env->segs[R_GS].selector & 0xffff; 251 (*regs)[11] = env->regs[R_EAX]; /* XXX */ 252 (*regs)[12] = env->eip; 253 (*regs)[13] = env->segs[R_CS].selector & 0xffff; 254 (*regs)[14] = env->eflags; 255 (*regs)[15] = env->regs[R_ESP]; 256 (*regs)[16] = env->segs[R_SS].selector & 0xffff; 257 } 258 #endif 259 260 #define USE_ELF_CORE_DUMP 261 #define ELF_EXEC_PAGESIZE 4096 262 263 #endif 264 265 #ifdef TARGET_ARM 266 267 #ifndef TARGET_AARCH64 268 /* 32 bit ARM definitions */ 269 270 #define ELF_START_MMAP 0x80000000 271 272 #define ELF_ARCH EM_ARM 273 #define ELF_CLASS ELFCLASS32 274 275 static inline void init_thread(struct target_pt_regs *regs, 276 struct image_info *infop) 277 { 278 abi_long stack = infop->start_stack; 279 memset(regs, 0, sizeof(*regs)); 280 281 regs->uregs[16] = ARM_CPU_MODE_USR; 282 if (infop->entry & 1) { 283 regs->uregs[16] |= CPSR_T; 284 } 285 regs->uregs[15] = infop->entry & 0xfffffffe; 286 regs->uregs[13] = infop->start_stack; 287 /* FIXME - what to for failure of get_user()? */ 288 get_user_ual(regs->uregs[2], stack + 8); /* envp */ 289 get_user_ual(regs->uregs[1], stack + 4); /* envp */ 290 /* XXX: it seems that r0 is zeroed after ! */ 291 regs->uregs[0] = 0; 292 /* For uClinux PIC binaries. */ 293 /* XXX: Linux does this only on ARM with no MMU (do we care ?) */ 294 regs->uregs[10] = infop->start_data; 295 296 /* Support ARM FDPIC. */ 297 if (info_is_fdpic(infop)) { 298 /* As described in the ABI document, r7 points to the loadmap info 299 * prepared by the kernel. If an interpreter is needed, r8 points 300 * to the interpreter loadmap and r9 points to the interpreter 301 * PT_DYNAMIC info. If no interpreter is needed, r8 is zero, and 302 * r9 points to the main program PT_DYNAMIC info. 303 */ 304 regs->uregs[7] = infop->loadmap_addr; 305 if (infop->interpreter_loadmap_addr) { 306 /* Executable is dynamically loaded. */ 307 regs->uregs[8] = infop->interpreter_loadmap_addr; 308 regs->uregs[9] = infop->interpreter_pt_dynamic_addr; 309 } else { 310 regs->uregs[8] = 0; 311 regs->uregs[9] = infop->pt_dynamic_addr; 312 } 313 } 314 } 315 316 #define ELF_NREG 18 317 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 318 319 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUARMState *env) 320 { 321 (*regs)[0] = tswapreg(env->regs[0]); 322 (*regs)[1] = tswapreg(env->regs[1]); 323 (*regs)[2] = tswapreg(env->regs[2]); 324 (*regs)[3] = tswapreg(env->regs[3]); 325 (*regs)[4] = tswapreg(env->regs[4]); 326 (*regs)[5] = tswapreg(env->regs[5]); 327 (*regs)[6] = tswapreg(env->regs[6]); 328 (*regs)[7] = tswapreg(env->regs[7]); 329 (*regs)[8] = tswapreg(env->regs[8]); 330 (*regs)[9] = tswapreg(env->regs[9]); 331 (*regs)[10] = tswapreg(env->regs[10]); 332 (*regs)[11] = tswapreg(env->regs[11]); 333 (*regs)[12] = tswapreg(env->regs[12]); 334 (*regs)[13] = tswapreg(env->regs[13]); 335 (*regs)[14] = tswapreg(env->regs[14]); 336 (*regs)[15] = tswapreg(env->regs[15]); 337 338 (*regs)[16] = tswapreg(cpsr_read((CPUARMState *)env)); 339 (*regs)[17] = tswapreg(env->regs[0]); /* XXX */ 340 } 341 342 #define USE_ELF_CORE_DUMP 343 #define ELF_EXEC_PAGESIZE 4096 344 345 enum 346 { 347 ARM_HWCAP_ARM_SWP = 1 << 0, 348 ARM_HWCAP_ARM_HALF = 1 << 1, 349 ARM_HWCAP_ARM_THUMB = 1 << 2, 350 ARM_HWCAP_ARM_26BIT = 1 << 3, 351 ARM_HWCAP_ARM_FAST_MULT = 1 << 4, 352 ARM_HWCAP_ARM_FPA = 1 << 5, 353 ARM_HWCAP_ARM_VFP = 1 << 6, 354 ARM_HWCAP_ARM_EDSP = 1 << 7, 355 ARM_HWCAP_ARM_JAVA = 1 << 8, 356 ARM_HWCAP_ARM_IWMMXT = 1 << 9, 357 ARM_HWCAP_ARM_CRUNCH = 1 << 10, 358 ARM_HWCAP_ARM_THUMBEE = 1 << 11, 359 ARM_HWCAP_ARM_NEON = 1 << 12, 360 ARM_HWCAP_ARM_VFPv3 = 1 << 13, 361 ARM_HWCAP_ARM_VFPv3D16 = 1 << 14, 362 ARM_HWCAP_ARM_TLS = 1 << 15, 363 ARM_HWCAP_ARM_VFPv4 = 1 << 16, 364 ARM_HWCAP_ARM_IDIVA = 1 << 17, 365 ARM_HWCAP_ARM_IDIVT = 1 << 18, 366 ARM_HWCAP_ARM_VFPD32 = 1 << 19, 367 ARM_HWCAP_ARM_LPAE = 1 << 20, 368 ARM_HWCAP_ARM_EVTSTRM = 1 << 21, 369 }; 370 371 enum { 372 ARM_HWCAP2_ARM_AES = 1 << 0, 373 ARM_HWCAP2_ARM_PMULL = 1 << 1, 374 ARM_HWCAP2_ARM_SHA1 = 1 << 2, 375 ARM_HWCAP2_ARM_SHA2 = 1 << 3, 376 ARM_HWCAP2_ARM_CRC32 = 1 << 4, 377 }; 378 379 /* The commpage only exists for 32 bit kernels */ 380 381 /* Return 1 if the proposed guest space is suitable for the guest. 382 * Return 0 if the proposed guest space isn't suitable, but another 383 * address space should be tried. 384 * Return -1 if there is no way the proposed guest space can be 385 * valid regardless of the base. 386 * The guest code may leave a page mapped and populate it if the 387 * address is suitable. 388 */ 389 static int init_guest_commpage(unsigned long guest_base, 390 unsigned long guest_size) 391 { 392 unsigned long real_start, test_page_addr; 393 394 /* We need to check that we can force a fault on access to the 395 * commpage at 0xffff0fxx 396 */ 397 test_page_addr = guest_base + (0xffff0f00 & qemu_host_page_mask); 398 399 /* If the commpage lies within the already allocated guest space, 400 * then there is no way we can allocate it. 401 * 402 * You may be thinking that that this check is redundant because 403 * we already validated the guest size against MAX_RESERVED_VA; 404 * but if qemu_host_page_mask is unusually large, then 405 * test_page_addr may be lower. 406 */ 407 if (test_page_addr >= guest_base 408 && test_page_addr < (guest_base + guest_size)) { 409 return -1; 410 } 411 412 /* Note it needs to be writeable to let us initialise it */ 413 real_start = (unsigned long) 414 mmap((void *)test_page_addr, qemu_host_page_size, 415 PROT_READ | PROT_WRITE, 416 MAP_ANONYMOUS | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 417 418 /* If we can't map it then try another address */ 419 if (real_start == -1ul) { 420 return 0; 421 } 422 423 if (real_start != test_page_addr) { 424 /* OS didn't put the page where we asked - unmap and reject */ 425 munmap((void *)real_start, qemu_host_page_size); 426 return 0; 427 } 428 429 /* Leave the page mapped 430 * Populate it (mmap should have left it all 0'd) 431 */ 432 433 /* Kernel helper versions */ 434 __put_user(5, (uint32_t *)g2h(0xffff0ffcul)); 435 436 /* Now it's populated make it RO */ 437 if (mprotect((void *)test_page_addr, qemu_host_page_size, PROT_READ)) { 438 perror("Protecting guest commpage"); 439 exit(-1); 440 } 441 442 return 1; /* All good */ 443 } 444 445 #define ELF_HWCAP get_elf_hwcap() 446 #define ELF_HWCAP2 get_elf_hwcap2() 447 448 static uint32_t get_elf_hwcap(void) 449 { 450 ARMCPU *cpu = ARM_CPU(thread_cpu); 451 uint32_t hwcaps = 0; 452 453 hwcaps |= ARM_HWCAP_ARM_SWP; 454 hwcaps |= ARM_HWCAP_ARM_HALF; 455 hwcaps |= ARM_HWCAP_ARM_THUMB; 456 hwcaps |= ARM_HWCAP_ARM_FAST_MULT; 457 458 /* probe for the extra features */ 459 #define GET_FEATURE(feat, hwcap) \ 460 do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0) 461 /* EDSP is in v5TE and above, but all our v5 CPUs are v5TE */ 462 GET_FEATURE(ARM_FEATURE_V5, ARM_HWCAP_ARM_EDSP); 463 GET_FEATURE(ARM_FEATURE_VFP, ARM_HWCAP_ARM_VFP); 464 GET_FEATURE(ARM_FEATURE_IWMMXT, ARM_HWCAP_ARM_IWMMXT); 465 GET_FEATURE(ARM_FEATURE_THUMB2EE, ARM_HWCAP_ARM_THUMBEE); 466 GET_FEATURE(ARM_FEATURE_NEON, ARM_HWCAP_ARM_NEON); 467 GET_FEATURE(ARM_FEATURE_VFP3, ARM_HWCAP_ARM_VFPv3); 468 GET_FEATURE(ARM_FEATURE_V6K, ARM_HWCAP_ARM_TLS); 469 GET_FEATURE(ARM_FEATURE_VFP4, ARM_HWCAP_ARM_VFPv4); 470 GET_FEATURE(ARM_FEATURE_ARM_DIV, ARM_HWCAP_ARM_IDIVA); 471 GET_FEATURE(ARM_FEATURE_THUMB_DIV, ARM_HWCAP_ARM_IDIVT); 472 /* All QEMU's VFPv3 CPUs have 32 registers, see VFP_DREG in translate.c. 473 * Note that the ARM_HWCAP_ARM_VFPv3D16 bit is always the inverse of 474 * ARM_HWCAP_ARM_VFPD32 (and so always clear for QEMU); it is unrelated 475 * to our VFP_FP16 feature bit. 476 */ 477 GET_FEATURE(ARM_FEATURE_VFP3, ARM_HWCAP_ARM_VFPD32); 478 GET_FEATURE(ARM_FEATURE_LPAE, ARM_HWCAP_ARM_LPAE); 479 480 return hwcaps; 481 } 482 483 static uint32_t get_elf_hwcap2(void) 484 { 485 ARMCPU *cpu = ARM_CPU(thread_cpu); 486 uint32_t hwcaps = 0; 487 488 GET_FEATURE(ARM_FEATURE_V8_AES, ARM_HWCAP2_ARM_AES); 489 GET_FEATURE(ARM_FEATURE_V8_PMULL, ARM_HWCAP2_ARM_PMULL); 490 GET_FEATURE(ARM_FEATURE_V8_SHA1, ARM_HWCAP2_ARM_SHA1); 491 GET_FEATURE(ARM_FEATURE_V8_SHA256, ARM_HWCAP2_ARM_SHA2); 492 GET_FEATURE(ARM_FEATURE_CRC, ARM_HWCAP2_ARM_CRC32); 493 return hwcaps; 494 } 495 496 #undef GET_FEATURE 497 498 #else 499 /* 64 bit ARM definitions */ 500 #define ELF_START_MMAP 0x80000000 501 502 #define ELF_ARCH EM_AARCH64 503 #define ELF_CLASS ELFCLASS64 504 #define ELF_PLATFORM "aarch64" 505 506 static inline void init_thread(struct target_pt_regs *regs, 507 struct image_info *infop) 508 { 509 abi_long stack = infop->start_stack; 510 memset(regs, 0, sizeof(*regs)); 511 512 regs->pc = infop->entry & ~0x3ULL; 513 regs->sp = stack; 514 } 515 516 #define ELF_NREG 34 517 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 518 519 static void elf_core_copy_regs(target_elf_gregset_t *regs, 520 const CPUARMState *env) 521 { 522 int i; 523 524 for (i = 0; i < 32; i++) { 525 (*regs)[i] = tswapreg(env->xregs[i]); 526 } 527 (*regs)[32] = tswapreg(env->pc); 528 (*regs)[33] = tswapreg(pstate_read((CPUARMState *)env)); 529 } 530 531 #define USE_ELF_CORE_DUMP 532 #define ELF_EXEC_PAGESIZE 4096 533 534 enum { 535 ARM_HWCAP_A64_FP = 1 << 0, 536 ARM_HWCAP_A64_ASIMD = 1 << 1, 537 ARM_HWCAP_A64_EVTSTRM = 1 << 2, 538 ARM_HWCAP_A64_AES = 1 << 3, 539 ARM_HWCAP_A64_PMULL = 1 << 4, 540 ARM_HWCAP_A64_SHA1 = 1 << 5, 541 ARM_HWCAP_A64_SHA2 = 1 << 6, 542 ARM_HWCAP_A64_CRC32 = 1 << 7, 543 ARM_HWCAP_A64_ATOMICS = 1 << 8, 544 ARM_HWCAP_A64_FPHP = 1 << 9, 545 ARM_HWCAP_A64_ASIMDHP = 1 << 10, 546 ARM_HWCAP_A64_CPUID = 1 << 11, 547 ARM_HWCAP_A64_ASIMDRDM = 1 << 12, 548 ARM_HWCAP_A64_JSCVT = 1 << 13, 549 ARM_HWCAP_A64_FCMA = 1 << 14, 550 ARM_HWCAP_A64_LRCPC = 1 << 15, 551 ARM_HWCAP_A64_DCPOP = 1 << 16, 552 ARM_HWCAP_A64_SHA3 = 1 << 17, 553 ARM_HWCAP_A64_SM3 = 1 << 18, 554 ARM_HWCAP_A64_SM4 = 1 << 19, 555 ARM_HWCAP_A64_ASIMDDP = 1 << 20, 556 ARM_HWCAP_A64_SHA512 = 1 << 21, 557 ARM_HWCAP_A64_SVE = 1 << 22, 558 }; 559 560 #define ELF_HWCAP get_elf_hwcap() 561 562 static uint32_t get_elf_hwcap(void) 563 { 564 ARMCPU *cpu = ARM_CPU(thread_cpu); 565 uint32_t hwcaps = 0; 566 567 hwcaps |= ARM_HWCAP_A64_FP; 568 hwcaps |= ARM_HWCAP_A64_ASIMD; 569 570 /* probe for the extra features */ 571 #define GET_FEATURE(feat, hwcap) \ 572 do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0) 573 GET_FEATURE(ARM_FEATURE_V8_AES, ARM_HWCAP_A64_AES); 574 GET_FEATURE(ARM_FEATURE_V8_PMULL, ARM_HWCAP_A64_PMULL); 575 GET_FEATURE(ARM_FEATURE_V8_SHA1, ARM_HWCAP_A64_SHA1); 576 GET_FEATURE(ARM_FEATURE_V8_SHA256, ARM_HWCAP_A64_SHA2); 577 GET_FEATURE(ARM_FEATURE_CRC, ARM_HWCAP_A64_CRC32); 578 GET_FEATURE(ARM_FEATURE_V8_SHA3, ARM_HWCAP_A64_SHA3); 579 GET_FEATURE(ARM_FEATURE_V8_SM3, ARM_HWCAP_A64_SM3); 580 GET_FEATURE(ARM_FEATURE_V8_SM4, ARM_HWCAP_A64_SM4); 581 GET_FEATURE(ARM_FEATURE_V8_SHA512, ARM_HWCAP_A64_SHA512); 582 GET_FEATURE(ARM_FEATURE_V8_FP16, 583 ARM_HWCAP_A64_FPHP | ARM_HWCAP_A64_ASIMDHP); 584 GET_FEATURE(ARM_FEATURE_V8_ATOMICS, ARM_HWCAP_A64_ATOMICS); 585 GET_FEATURE(ARM_FEATURE_V8_RDM, ARM_HWCAP_A64_ASIMDRDM); 586 GET_FEATURE(ARM_FEATURE_V8_DOTPROD, ARM_HWCAP_A64_ASIMDDP); 587 GET_FEATURE(ARM_FEATURE_V8_FCMA, ARM_HWCAP_A64_FCMA); 588 GET_FEATURE(ARM_FEATURE_SVE, ARM_HWCAP_A64_SVE); 589 #undef GET_FEATURE 590 591 return hwcaps; 592 } 593 594 #endif /* not TARGET_AARCH64 */ 595 #endif /* TARGET_ARM */ 596 597 #ifdef TARGET_SPARC 598 #ifdef TARGET_SPARC64 599 600 #define ELF_START_MMAP 0x80000000 601 #define ELF_HWCAP (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \ 602 | HWCAP_SPARC_MULDIV | HWCAP_SPARC_V9) 603 #ifndef TARGET_ABI32 604 #define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS ) 605 #else 606 #define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC ) 607 #endif 608 609 #define ELF_CLASS ELFCLASS64 610 #define ELF_ARCH EM_SPARCV9 611 612 #define STACK_BIAS 2047 613 614 static inline void init_thread(struct target_pt_regs *regs, 615 struct image_info *infop) 616 { 617 #ifndef TARGET_ABI32 618 regs->tstate = 0; 619 #endif 620 regs->pc = infop->entry; 621 regs->npc = regs->pc + 4; 622 regs->y = 0; 623 #ifdef TARGET_ABI32 624 regs->u_regs[14] = infop->start_stack - 16 * 4; 625 #else 626 if (personality(infop->personality) == PER_LINUX32) 627 regs->u_regs[14] = infop->start_stack - 16 * 4; 628 else 629 regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS; 630 #endif 631 } 632 633 #else 634 #define ELF_START_MMAP 0x80000000 635 #define ELF_HWCAP (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \ 636 | HWCAP_SPARC_MULDIV) 637 638 #define ELF_CLASS ELFCLASS32 639 #define ELF_ARCH EM_SPARC 640 641 static inline void init_thread(struct target_pt_regs *regs, 642 struct image_info *infop) 643 { 644 regs->psr = 0; 645 regs->pc = infop->entry; 646 regs->npc = regs->pc + 4; 647 regs->y = 0; 648 regs->u_regs[14] = infop->start_stack - 16 * 4; 649 } 650 651 #endif 652 #endif 653 654 #ifdef TARGET_PPC 655 656 #define ELF_MACHINE PPC_ELF_MACHINE 657 #define ELF_START_MMAP 0x80000000 658 659 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32) 660 661 #define elf_check_arch(x) ( (x) == EM_PPC64 ) 662 663 #define ELF_CLASS ELFCLASS64 664 665 #else 666 667 #define ELF_CLASS ELFCLASS32 668 669 #endif 670 671 #define ELF_ARCH EM_PPC 672 673 /* Feature masks for the Aux Vector Hardware Capabilities (AT_HWCAP). 674 See arch/powerpc/include/asm/cputable.h. */ 675 enum { 676 QEMU_PPC_FEATURE_32 = 0x80000000, 677 QEMU_PPC_FEATURE_64 = 0x40000000, 678 QEMU_PPC_FEATURE_601_INSTR = 0x20000000, 679 QEMU_PPC_FEATURE_HAS_ALTIVEC = 0x10000000, 680 QEMU_PPC_FEATURE_HAS_FPU = 0x08000000, 681 QEMU_PPC_FEATURE_HAS_MMU = 0x04000000, 682 QEMU_PPC_FEATURE_HAS_4xxMAC = 0x02000000, 683 QEMU_PPC_FEATURE_UNIFIED_CACHE = 0x01000000, 684 QEMU_PPC_FEATURE_HAS_SPE = 0x00800000, 685 QEMU_PPC_FEATURE_HAS_EFP_SINGLE = 0x00400000, 686 QEMU_PPC_FEATURE_HAS_EFP_DOUBLE = 0x00200000, 687 QEMU_PPC_FEATURE_NO_TB = 0x00100000, 688 QEMU_PPC_FEATURE_POWER4 = 0x00080000, 689 QEMU_PPC_FEATURE_POWER5 = 0x00040000, 690 QEMU_PPC_FEATURE_POWER5_PLUS = 0x00020000, 691 QEMU_PPC_FEATURE_CELL = 0x00010000, 692 QEMU_PPC_FEATURE_BOOKE = 0x00008000, 693 QEMU_PPC_FEATURE_SMT = 0x00004000, 694 QEMU_PPC_FEATURE_ICACHE_SNOOP = 0x00002000, 695 QEMU_PPC_FEATURE_ARCH_2_05 = 0x00001000, 696 QEMU_PPC_FEATURE_PA6T = 0x00000800, 697 QEMU_PPC_FEATURE_HAS_DFP = 0x00000400, 698 QEMU_PPC_FEATURE_POWER6_EXT = 0x00000200, 699 QEMU_PPC_FEATURE_ARCH_2_06 = 0x00000100, 700 QEMU_PPC_FEATURE_HAS_VSX = 0x00000080, 701 QEMU_PPC_FEATURE_PSERIES_PERFMON_COMPAT = 0x00000040, 702 703 QEMU_PPC_FEATURE_TRUE_LE = 0x00000002, 704 QEMU_PPC_FEATURE_PPC_LE = 0x00000001, 705 706 /* Feature definitions in AT_HWCAP2. */ 707 QEMU_PPC_FEATURE2_ARCH_2_07 = 0x80000000, /* ISA 2.07 */ 708 QEMU_PPC_FEATURE2_HAS_HTM = 0x40000000, /* Hardware Transactional Memory */ 709 QEMU_PPC_FEATURE2_HAS_DSCR = 0x20000000, /* Data Stream Control Register */ 710 QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */ 711 QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */ 712 QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */ 713 }; 714 715 #define ELF_HWCAP get_elf_hwcap() 716 717 static uint32_t get_elf_hwcap(void) 718 { 719 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu); 720 uint32_t features = 0; 721 722 /* We don't have to be terribly complete here; the high points are 723 Altivec/FP/SPE support. Anything else is just a bonus. */ 724 #define GET_FEATURE(flag, feature) \ 725 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0) 726 #define GET_FEATURE2(flags, feature) \ 727 do { \ 728 if ((cpu->env.insns_flags2 & flags) == flags) { \ 729 features |= feature; \ 730 } \ 731 } while (0) 732 GET_FEATURE(PPC_64B, QEMU_PPC_FEATURE_64); 733 GET_FEATURE(PPC_FLOAT, QEMU_PPC_FEATURE_HAS_FPU); 734 GET_FEATURE(PPC_ALTIVEC, QEMU_PPC_FEATURE_HAS_ALTIVEC); 735 GET_FEATURE(PPC_SPE, QEMU_PPC_FEATURE_HAS_SPE); 736 GET_FEATURE(PPC_SPE_SINGLE, QEMU_PPC_FEATURE_HAS_EFP_SINGLE); 737 GET_FEATURE(PPC_SPE_DOUBLE, QEMU_PPC_FEATURE_HAS_EFP_DOUBLE); 738 GET_FEATURE(PPC_BOOKE, QEMU_PPC_FEATURE_BOOKE); 739 GET_FEATURE(PPC_405_MAC, QEMU_PPC_FEATURE_HAS_4xxMAC); 740 GET_FEATURE2(PPC2_DFP, QEMU_PPC_FEATURE_HAS_DFP); 741 GET_FEATURE2(PPC2_VSX, QEMU_PPC_FEATURE_HAS_VSX); 742 GET_FEATURE2((PPC2_PERM_ISA206 | PPC2_DIVE_ISA206 | PPC2_ATOMIC_ISA206 | 743 PPC2_FP_CVT_ISA206 | PPC2_FP_TST_ISA206), 744 QEMU_PPC_FEATURE_ARCH_2_06); 745 #undef GET_FEATURE 746 #undef GET_FEATURE2 747 748 return features; 749 } 750 751 #define ELF_HWCAP2 get_elf_hwcap2() 752 753 static uint32_t get_elf_hwcap2(void) 754 { 755 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu); 756 uint32_t features = 0; 757 758 #define GET_FEATURE(flag, feature) \ 759 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0) 760 #define GET_FEATURE2(flag, feature) \ 761 do { if (cpu->env.insns_flags2 & flag) { features |= feature; } } while (0) 762 763 GET_FEATURE(PPC_ISEL, QEMU_PPC_FEATURE2_HAS_ISEL); 764 GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR); 765 GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 | 766 PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07); 767 768 #undef GET_FEATURE 769 #undef GET_FEATURE2 770 771 return features; 772 } 773 774 /* 775 * The requirements here are: 776 * - keep the final alignment of sp (sp & 0xf) 777 * - make sure the 32-bit value at the first 16 byte aligned position of 778 * AUXV is greater than 16 for glibc compatibility. 779 * AT_IGNOREPPC is used for that. 780 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC, 781 * even if DLINFO_ARCH_ITEMS goes to zero or is undefined. 782 */ 783 #define DLINFO_ARCH_ITEMS 5 784 #define ARCH_DLINFO \ 785 do { \ 786 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu); \ 787 /* \ 788 * Handle glibc compatibility: these magic entries must \ 789 * be at the lowest addresses in the final auxv. \ 790 */ \ 791 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \ 792 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \ 793 NEW_AUX_ENT(AT_DCACHEBSIZE, cpu->env.dcache_line_size); \ 794 NEW_AUX_ENT(AT_ICACHEBSIZE, cpu->env.icache_line_size); \ 795 NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \ 796 } while (0) 797 798 static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop) 799 { 800 _regs->gpr[1] = infop->start_stack; 801 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32) 802 if (get_ppc64_abi(infop) < 2) { 803 uint64_t val; 804 get_user_u64(val, infop->entry + 8); 805 _regs->gpr[2] = val + infop->load_bias; 806 get_user_u64(val, infop->entry); 807 infop->entry = val + infop->load_bias; 808 } else { 809 _regs->gpr[12] = infop->entry; /* r12 set to global entry address */ 810 } 811 #endif 812 _regs->nip = infop->entry; 813 } 814 815 /* See linux kernel: arch/powerpc/include/asm/elf.h. */ 816 #define ELF_NREG 48 817 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 818 819 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUPPCState *env) 820 { 821 int i; 822 target_ulong ccr = 0; 823 824 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) { 825 (*regs)[i] = tswapreg(env->gpr[i]); 826 } 827 828 (*regs)[32] = tswapreg(env->nip); 829 (*regs)[33] = tswapreg(env->msr); 830 (*regs)[35] = tswapreg(env->ctr); 831 (*regs)[36] = tswapreg(env->lr); 832 (*regs)[37] = tswapreg(env->xer); 833 834 for (i = 0; i < ARRAY_SIZE(env->crf); i++) { 835 ccr |= env->crf[i] << (32 - ((i + 1) * 4)); 836 } 837 (*regs)[38] = tswapreg(ccr); 838 } 839 840 #define USE_ELF_CORE_DUMP 841 #define ELF_EXEC_PAGESIZE 4096 842 843 #endif 844 845 #ifdef TARGET_MIPS 846 847 #define ELF_START_MMAP 0x80000000 848 849 #ifdef TARGET_MIPS64 850 #define ELF_CLASS ELFCLASS64 851 #else 852 #define ELF_CLASS ELFCLASS32 853 #endif 854 #define ELF_ARCH EM_MIPS 855 856 static inline void init_thread(struct target_pt_regs *regs, 857 struct image_info *infop) 858 { 859 regs->cp0_status = 2 << CP0St_KSU; 860 regs->cp0_epc = infop->entry; 861 regs->regs[29] = infop->start_stack; 862 } 863 864 /* See linux kernel: arch/mips/include/asm/elf.h. */ 865 #define ELF_NREG 45 866 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 867 868 /* See linux kernel: arch/mips/include/asm/reg.h. */ 869 enum { 870 #ifdef TARGET_MIPS64 871 TARGET_EF_R0 = 0, 872 #else 873 TARGET_EF_R0 = 6, 874 #endif 875 TARGET_EF_R26 = TARGET_EF_R0 + 26, 876 TARGET_EF_R27 = TARGET_EF_R0 + 27, 877 TARGET_EF_LO = TARGET_EF_R0 + 32, 878 TARGET_EF_HI = TARGET_EF_R0 + 33, 879 TARGET_EF_CP0_EPC = TARGET_EF_R0 + 34, 880 TARGET_EF_CP0_BADVADDR = TARGET_EF_R0 + 35, 881 TARGET_EF_CP0_STATUS = TARGET_EF_R0 + 36, 882 TARGET_EF_CP0_CAUSE = TARGET_EF_R0 + 37 883 }; 884 885 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */ 886 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMIPSState *env) 887 { 888 int i; 889 890 for (i = 0; i < TARGET_EF_R0; i++) { 891 (*regs)[i] = 0; 892 } 893 (*regs)[TARGET_EF_R0] = 0; 894 895 for (i = 1; i < ARRAY_SIZE(env->active_tc.gpr); i++) { 896 (*regs)[TARGET_EF_R0 + i] = tswapreg(env->active_tc.gpr[i]); 897 } 898 899 (*regs)[TARGET_EF_R26] = 0; 900 (*regs)[TARGET_EF_R27] = 0; 901 (*regs)[TARGET_EF_LO] = tswapreg(env->active_tc.LO[0]); 902 (*regs)[TARGET_EF_HI] = tswapreg(env->active_tc.HI[0]); 903 (*regs)[TARGET_EF_CP0_EPC] = tswapreg(env->active_tc.PC); 904 (*regs)[TARGET_EF_CP0_BADVADDR] = tswapreg(env->CP0_BadVAddr); 905 (*regs)[TARGET_EF_CP0_STATUS] = tswapreg(env->CP0_Status); 906 (*regs)[TARGET_EF_CP0_CAUSE] = tswapreg(env->CP0_Cause); 907 } 908 909 #define USE_ELF_CORE_DUMP 910 #define ELF_EXEC_PAGESIZE 4096 911 912 /* See arch/mips/include/uapi/asm/hwcap.h. */ 913 enum { 914 HWCAP_MIPS_R6 = (1 << 0), 915 HWCAP_MIPS_MSA = (1 << 1), 916 }; 917 918 #define ELF_HWCAP get_elf_hwcap() 919 920 static uint32_t get_elf_hwcap(void) 921 { 922 MIPSCPU *cpu = MIPS_CPU(thread_cpu); 923 uint32_t hwcaps = 0; 924 925 #define GET_FEATURE(flag, hwcap) \ 926 do { if (cpu->env.insn_flags & (flag)) { hwcaps |= hwcap; } } while (0) 927 928 GET_FEATURE(ISA_MIPS32R6 | ISA_MIPS64R6, HWCAP_MIPS_R6); 929 GET_FEATURE(ASE_MSA, HWCAP_MIPS_MSA); 930 931 #undef GET_FEATURE 932 933 return hwcaps; 934 } 935 936 #endif /* TARGET_MIPS */ 937 938 #ifdef TARGET_MICROBLAZE 939 940 #define ELF_START_MMAP 0x80000000 941 942 #define elf_check_arch(x) ( (x) == EM_MICROBLAZE || (x) == EM_MICROBLAZE_OLD) 943 944 #define ELF_CLASS ELFCLASS32 945 #define ELF_ARCH EM_MICROBLAZE 946 947 static inline void init_thread(struct target_pt_regs *regs, 948 struct image_info *infop) 949 { 950 regs->pc = infop->entry; 951 regs->r1 = infop->start_stack; 952 953 } 954 955 #define ELF_EXEC_PAGESIZE 4096 956 957 #define USE_ELF_CORE_DUMP 958 #define ELF_NREG 38 959 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 960 961 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */ 962 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMBState *env) 963 { 964 int i, pos = 0; 965 966 for (i = 0; i < 32; i++) { 967 (*regs)[pos++] = tswapreg(env->regs[i]); 968 } 969 970 for (i = 0; i < 6; i++) { 971 (*regs)[pos++] = tswapreg(env->sregs[i]); 972 } 973 } 974 975 #endif /* TARGET_MICROBLAZE */ 976 977 #ifdef TARGET_NIOS2 978 979 #define ELF_START_MMAP 0x80000000 980 981 #define elf_check_arch(x) ((x) == EM_ALTERA_NIOS2) 982 983 #define ELF_CLASS ELFCLASS32 984 #define ELF_ARCH EM_ALTERA_NIOS2 985 986 static void init_thread(struct target_pt_regs *regs, struct image_info *infop) 987 { 988 regs->ea = infop->entry; 989 regs->sp = infop->start_stack; 990 regs->estatus = 0x3; 991 } 992 993 #define ELF_EXEC_PAGESIZE 4096 994 995 #define USE_ELF_CORE_DUMP 996 #define ELF_NREG 49 997 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 998 999 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */ 1000 static void elf_core_copy_regs(target_elf_gregset_t *regs, 1001 const CPUNios2State *env) 1002 { 1003 int i; 1004 1005 (*regs)[0] = -1; 1006 for (i = 1; i < 8; i++) /* r0-r7 */ 1007 (*regs)[i] = tswapreg(env->regs[i + 7]); 1008 1009 for (i = 8; i < 16; i++) /* r8-r15 */ 1010 (*regs)[i] = tswapreg(env->regs[i - 8]); 1011 1012 for (i = 16; i < 24; i++) /* r16-r23 */ 1013 (*regs)[i] = tswapreg(env->regs[i + 7]); 1014 (*regs)[24] = -1; /* R_ET */ 1015 (*regs)[25] = -1; /* R_BT */ 1016 (*regs)[26] = tswapreg(env->regs[R_GP]); 1017 (*regs)[27] = tswapreg(env->regs[R_SP]); 1018 (*regs)[28] = tswapreg(env->regs[R_FP]); 1019 (*regs)[29] = tswapreg(env->regs[R_EA]); 1020 (*regs)[30] = -1; /* R_SSTATUS */ 1021 (*regs)[31] = tswapreg(env->regs[R_RA]); 1022 1023 (*regs)[32] = tswapreg(env->regs[R_PC]); 1024 1025 (*regs)[33] = -1; /* R_STATUS */ 1026 (*regs)[34] = tswapreg(env->regs[CR_ESTATUS]); 1027 1028 for (i = 35; i < 49; i++) /* ... */ 1029 (*regs)[i] = -1; 1030 } 1031 1032 #endif /* TARGET_NIOS2 */ 1033 1034 #ifdef TARGET_OPENRISC 1035 1036 #define ELF_START_MMAP 0x08000000 1037 1038 #define ELF_ARCH EM_OPENRISC 1039 #define ELF_CLASS ELFCLASS32 1040 #define ELF_DATA ELFDATA2MSB 1041 1042 static inline void init_thread(struct target_pt_regs *regs, 1043 struct image_info *infop) 1044 { 1045 regs->pc = infop->entry; 1046 regs->gpr[1] = infop->start_stack; 1047 } 1048 1049 #define USE_ELF_CORE_DUMP 1050 #define ELF_EXEC_PAGESIZE 8192 1051 1052 /* See linux kernel arch/openrisc/include/asm/elf.h. */ 1053 #define ELF_NREG 34 /* gprs and pc, sr */ 1054 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1055 1056 static void elf_core_copy_regs(target_elf_gregset_t *regs, 1057 const CPUOpenRISCState *env) 1058 { 1059 int i; 1060 1061 for (i = 0; i < 32; i++) { 1062 (*regs)[i] = tswapreg(cpu_get_gpr(env, i)); 1063 } 1064 (*regs)[32] = tswapreg(env->pc); 1065 (*regs)[33] = tswapreg(cpu_get_sr(env)); 1066 } 1067 #define ELF_HWCAP 0 1068 #define ELF_PLATFORM NULL 1069 1070 #endif /* TARGET_OPENRISC */ 1071 1072 #ifdef TARGET_SH4 1073 1074 #define ELF_START_MMAP 0x80000000 1075 1076 #define ELF_CLASS ELFCLASS32 1077 #define ELF_ARCH EM_SH 1078 1079 static inline void init_thread(struct target_pt_regs *regs, 1080 struct image_info *infop) 1081 { 1082 /* Check other registers XXXXX */ 1083 regs->pc = infop->entry; 1084 regs->regs[15] = infop->start_stack; 1085 } 1086 1087 /* See linux kernel: arch/sh/include/asm/elf.h. */ 1088 #define ELF_NREG 23 1089 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1090 1091 /* See linux kernel: arch/sh/include/asm/ptrace.h. */ 1092 enum { 1093 TARGET_REG_PC = 16, 1094 TARGET_REG_PR = 17, 1095 TARGET_REG_SR = 18, 1096 TARGET_REG_GBR = 19, 1097 TARGET_REG_MACH = 20, 1098 TARGET_REG_MACL = 21, 1099 TARGET_REG_SYSCALL = 22 1100 }; 1101 1102 static inline void elf_core_copy_regs(target_elf_gregset_t *regs, 1103 const CPUSH4State *env) 1104 { 1105 int i; 1106 1107 for (i = 0; i < 16; i++) { 1108 (*regs)[i] = tswapreg(env->gregs[i]); 1109 } 1110 1111 (*regs)[TARGET_REG_PC] = tswapreg(env->pc); 1112 (*regs)[TARGET_REG_PR] = tswapreg(env->pr); 1113 (*regs)[TARGET_REG_SR] = tswapreg(env->sr); 1114 (*regs)[TARGET_REG_GBR] = tswapreg(env->gbr); 1115 (*regs)[TARGET_REG_MACH] = tswapreg(env->mach); 1116 (*regs)[TARGET_REG_MACL] = tswapreg(env->macl); 1117 (*regs)[TARGET_REG_SYSCALL] = 0; /* FIXME */ 1118 } 1119 1120 #define USE_ELF_CORE_DUMP 1121 #define ELF_EXEC_PAGESIZE 4096 1122 1123 enum { 1124 SH_CPU_HAS_FPU = 0x0001, /* Hardware FPU support */ 1125 SH_CPU_HAS_P2_FLUSH_BUG = 0x0002, /* Need to flush the cache in P2 area */ 1126 SH_CPU_HAS_MMU_PAGE_ASSOC = 0x0004, /* SH3: TLB way selection bit support */ 1127 SH_CPU_HAS_DSP = 0x0008, /* SH-DSP: DSP support */ 1128 SH_CPU_HAS_PERF_COUNTER = 0x0010, /* Hardware performance counters */ 1129 SH_CPU_HAS_PTEA = 0x0020, /* PTEA register */ 1130 SH_CPU_HAS_LLSC = 0x0040, /* movli.l/movco.l */ 1131 SH_CPU_HAS_L2_CACHE = 0x0080, /* Secondary cache / URAM */ 1132 SH_CPU_HAS_OP32 = 0x0100, /* 32-bit instruction support */ 1133 SH_CPU_HAS_PTEAEX = 0x0200, /* PTE ASID Extension support */ 1134 }; 1135 1136 #define ELF_HWCAP get_elf_hwcap() 1137 1138 static uint32_t get_elf_hwcap(void) 1139 { 1140 SuperHCPU *cpu = SUPERH_CPU(thread_cpu); 1141 uint32_t hwcap = 0; 1142 1143 hwcap |= SH_CPU_HAS_FPU; 1144 1145 if (cpu->env.features & SH_FEATURE_SH4A) { 1146 hwcap |= SH_CPU_HAS_LLSC; 1147 } 1148 1149 return hwcap; 1150 } 1151 1152 #endif 1153 1154 #ifdef TARGET_CRIS 1155 1156 #define ELF_START_MMAP 0x80000000 1157 1158 #define ELF_CLASS ELFCLASS32 1159 #define ELF_ARCH EM_CRIS 1160 1161 static inline void init_thread(struct target_pt_regs *regs, 1162 struct image_info *infop) 1163 { 1164 regs->erp = infop->entry; 1165 } 1166 1167 #define ELF_EXEC_PAGESIZE 8192 1168 1169 #endif 1170 1171 #ifdef TARGET_M68K 1172 1173 #define ELF_START_MMAP 0x80000000 1174 1175 #define ELF_CLASS ELFCLASS32 1176 #define ELF_ARCH EM_68K 1177 1178 /* ??? Does this need to do anything? 1179 #define ELF_PLAT_INIT(_r) */ 1180 1181 static inline void init_thread(struct target_pt_regs *regs, 1182 struct image_info *infop) 1183 { 1184 regs->usp = infop->start_stack; 1185 regs->sr = 0; 1186 regs->pc = infop->entry; 1187 } 1188 1189 /* See linux kernel: arch/m68k/include/asm/elf.h. */ 1190 #define ELF_NREG 20 1191 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1192 1193 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUM68KState *env) 1194 { 1195 (*regs)[0] = tswapreg(env->dregs[1]); 1196 (*regs)[1] = tswapreg(env->dregs[2]); 1197 (*regs)[2] = tswapreg(env->dregs[3]); 1198 (*regs)[3] = tswapreg(env->dregs[4]); 1199 (*regs)[4] = tswapreg(env->dregs[5]); 1200 (*regs)[5] = tswapreg(env->dregs[6]); 1201 (*regs)[6] = tswapreg(env->dregs[7]); 1202 (*regs)[7] = tswapreg(env->aregs[0]); 1203 (*regs)[8] = tswapreg(env->aregs[1]); 1204 (*regs)[9] = tswapreg(env->aregs[2]); 1205 (*regs)[10] = tswapreg(env->aregs[3]); 1206 (*regs)[11] = tswapreg(env->aregs[4]); 1207 (*regs)[12] = tswapreg(env->aregs[5]); 1208 (*regs)[13] = tswapreg(env->aregs[6]); 1209 (*regs)[14] = tswapreg(env->dregs[0]); 1210 (*regs)[15] = tswapreg(env->aregs[7]); 1211 (*regs)[16] = tswapreg(env->dregs[0]); /* FIXME: orig_d0 */ 1212 (*regs)[17] = tswapreg(env->sr); 1213 (*regs)[18] = tswapreg(env->pc); 1214 (*regs)[19] = 0; /* FIXME: regs->format | regs->vector */ 1215 } 1216 1217 #define USE_ELF_CORE_DUMP 1218 #define ELF_EXEC_PAGESIZE 8192 1219 1220 #endif 1221 1222 #ifdef TARGET_ALPHA 1223 1224 #define ELF_START_MMAP (0x30000000000ULL) 1225 1226 #define ELF_CLASS ELFCLASS64 1227 #define ELF_ARCH EM_ALPHA 1228 1229 static inline void init_thread(struct target_pt_regs *regs, 1230 struct image_info *infop) 1231 { 1232 regs->pc = infop->entry; 1233 regs->ps = 8; 1234 regs->usp = infop->start_stack; 1235 } 1236 1237 #define ELF_EXEC_PAGESIZE 8192 1238 1239 #endif /* TARGET_ALPHA */ 1240 1241 #ifdef TARGET_S390X 1242 1243 #define ELF_START_MMAP (0x20000000000ULL) 1244 1245 #define ELF_CLASS ELFCLASS64 1246 #define ELF_DATA ELFDATA2MSB 1247 #define ELF_ARCH EM_S390 1248 1249 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) 1250 { 1251 regs->psw.addr = infop->entry; 1252 regs->psw.mask = PSW_MASK_64 | PSW_MASK_32; 1253 regs->gprs[15] = infop->start_stack; 1254 } 1255 1256 #endif /* TARGET_S390X */ 1257 1258 #ifdef TARGET_TILEGX 1259 1260 /* 42 bits real used address, a half for user mode */ 1261 #define ELF_START_MMAP (0x00000020000000000ULL) 1262 1263 #define elf_check_arch(x) ((x) == EM_TILEGX) 1264 1265 #define ELF_CLASS ELFCLASS64 1266 #define ELF_DATA ELFDATA2LSB 1267 #define ELF_ARCH EM_TILEGX 1268 1269 static inline void init_thread(struct target_pt_regs *regs, 1270 struct image_info *infop) 1271 { 1272 regs->pc = infop->entry; 1273 regs->sp = infop->start_stack; 1274 1275 } 1276 1277 #define ELF_EXEC_PAGESIZE 65536 /* TILE-Gx page size is 64KB */ 1278 1279 #endif /* TARGET_TILEGX */ 1280 1281 #ifdef TARGET_RISCV 1282 1283 #define ELF_START_MMAP 0x80000000 1284 #define ELF_ARCH EM_RISCV 1285 1286 #ifdef TARGET_RISCV32 1287 #define ELF_CLASS ELFCLASS32 1288 #else 1289 #define ELF_CLASS ELFCLASS64 1290 #endif 1291 1292 static inline void init_thread(struct target_pt_regs *regs, 1293 struct image_info *infop) 1294 { 1295 regs->sepc = infop->entry; 1296 regs->sp = infop->start_stack; 1297 } 1298 1299 #define ELF_EXEC_PAGESIZE 4096 1300 1301 #endif /* TARGET_RISCV */ 1302 1303 #ifdef TARGET_HPPA 1304 1305 #define ELF_START_MMAP 0x80000000 1306 #define ELF_CLASS ELFCLASS32 1307 #define ELF_ARCH EM_PARISC 1308 #define ELF_PLATFORM "PARISC" 1309 #define STACK_GROWS_DOWN 0 1310 #define STACK_ALIGNMENT 64 1311 1312 static inline void init_thread(struct target_pt_regs *regs, 1313 struct image_info *infop) 1314 { 1315 regs->iaoq[0] = infop->entry; 1316 regs->iaoq[1] = infop->entry + 4; 1317 regs->gr[23] = 0; 1318 regs->gr[24] = infop->arg_start; 1319 regs->gr[25] = (infop->arg_end - infop->arg_start) / sizeof(abi_ulong); 1320 /* The top-of-stack contains a linkage buffer. */ 1321 regs->gr[30] = infop->start_stack + 64; 1322 regs->gr[31] = infop->entry; 1323 } 1324 1325 #endif /* TARGET_HPPA */ 1326 1327 #ifdef TARGET_XTENSA 1328 1329 #define ELF_START_MMAP 0x20000000 1330 1331 #define ELF_CLASS ELFCLASS32 1332 #define ELF_ARCH EM_XTENSA 1333 1334 static inline void init_thread(struct target_pt_regs *regs, 1335 struct image_info *infop) 1336 { 1337 regs->windowbase = 0; 1338 regs->windowstart = 1; 1339 regs->areg[1] = infop->start_stack; 1340 regs->pc = infop->entry; 1341 } 1342 1343 /* See linux kernel: arch/xtensa/include/asm/elf.h. */ 1344 #define ELF_NREG 128 1345 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG]; 1346 1347 enum { 1348 TARGET_REG_PC, 1349 TARGET_REG_PS, 1350 TARGET_REG_LBEG, 1351 TARGET_REG_LEND, 1352 TARGET_REG_LCOUNT, 1353 TARGET_REG_SAR, 1354 TARGET_REG_WINDOWSTART, 1355 TARGET_REG_WINDOWBASE, 1356 TARGET_REG_THREADPTR, 1357 TARGET_REG_AR0 = 64, 1358 }; 1359 1360 static void elf_core_copy_regs(target_elf_gregset_t *regs, 1361 const CPUXtensaState *env) 1362 { 1363 unsigned i; 1364 1365 (*regs)[TARGET_REG_PC] = tswapreg(env->pc); 1366 (*regs)[TARGET_REG_PS] = tswapreg(env->sregs[PS] & ~PS_EXCM); 1367 (*regs)[TARGET_REG_LBEG] = tswapreg(env->sregs[LBEG]); 1368 (*regs)[TARGET_REG_LEND] = tswapreg(env->sregs[LEND]); 1369 (*regs)[TARGET_REG_LCOUNT] = tswapreg(env->sregs[LCOUNT]); 1370 (*regs)[TARGET_REG_SAR] = tswapreg(env->sregs[SAR]); 1371 (*regs)[TARGET_REG_WINDOWSTART] = tswapreg(env->sregs[WINDOW_START]); 1372 (*regs)[TARGET_REG_WINDOWBASE] = tswapreg(env->sregs[WINDOW_BASE]); 1373 (*regs)[TARGET_REG_THREADPTR] = tswapreg(env->uregs[THREADPTR]); 1374 xtensa_sync_phys_from_window((CPUXtensaState *)env); 1375 for (i = 0; i < env->config->nareg; ++i) { 1376 (*regs)[TARGET_REG_AR0 + i] = tswapreg(env->phys_regs[i]); 1377 } 1378 } 1379 1380 #define USE_ELF_CORE_DUMP 1381 #define ELF_EXEC_PAGESIZE 4096 1382 1383 #endif /* TARGET_XTENSA */ 1384 1385 #ifndef ELF_PLATFORM 1386 #define ELF_PLATFORM (NULL) 1387 #endif 1388 1389 #ifndef ELF_MACHINE 1390 #define ELF_MACHINE ELF_ARCH 1391 #endif 1392 1393 #ifndef elf_check_arch 1394 #define elf_check_arch(x) ((x) == ELF_ARCH) 1395 #endif 1396 1397 #ifndef ELF_HWCAP 1398 #define ELF_HWCAP 0 1399 #endif 1400 1401 #ifndef STACK_GROWS_DOWN 1402 #define STACK_GROWS_DOWN 1 1403 #endif 1404 1405 #ifndef STACK_ALIGNMENT 1406 #define STACK_ALIGNMENT 16 1407 #endif 1408 1409 #ifdef TARGET_ABI32 1410 #undef ELF_CLASS 1411 #define ELF_CLASS ELFCLASS32 1412 #undef bswaptls 1413 #define bswaptls(ptr) bswap32s(ptr) 1414 #endif 1415 1416 #include "elf.h" 1417 1418 struct exec 1419 { 1420 unsigned int a_info; /* Use macros N_MAGIC, etc for access */ 1421 unsigned int a_text; /* length of text, in bytes */ 1422 unsigned int a_data; /* length of data, in bytes */ 1423 unsigned int a_bss; /* length of uninitialized data area, in bytes */ 1424 unsigned int a_syms; /* length of symbol table data in file, in bytes */ 1425 unsigned int a_entry; /* start address */ 1426 unsigned int a_trsize; /* length of relocation info for text, in bytes */ 1427 unsigned int a_drsize; /* length of relocation info for data, in bytes */ 1428 }; 1429 1430 1431 #define N_MAGIC(exec) ((exec).a_info & 0xffff) 1432 #define OMAGIC 0407 1433 #define NMAGIC 0410 1434 #define ZMAGIC 0413 1435 #define QMAGIC 0314 1436 1437 /* Necessary parameters */ 1438 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE 1439 #define TARGET_ELF_PAGESTART(_v) ((_v) & \ 1440 ~(abi_ulong)(TARGET_ELF_EXEC_PAGESIZE-1)) 1441 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1)) 1442 1443 #define DLINFO_ITEMS 15 1444 1445 static inline void memcpy_fromfs(void * to, const void * from, unsigned long n) 1446 { 1447 memcpy(to, from, n); 1448 } 1449 1450 #ifdef BSWAP_NEEDED 1451 static void bswap_ehdr(struct elfhdr *ehdr) 1452 { 1453 bswap16s(&ehdr->e_type); /* Object file type */ 1454 bswap16s(&ehdr->e_machine); /* Architecture */ 1455 bswap32s(&ehdr->e_version); /* Object file version */ 1456 bswaptls(&ehdr->e_entry); /* Entry point virtual address */ 1457 bswaptls(&ehdr->e_phoff); /* Program header table file offset */ 1458 bswaptls(&ehdr->e_shoff); /* Section header table file offset */ 1459 bswap32s(&ehdr->e_flags); /* Processor-specific flags */ 1460 bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */ 1461 bswap16s(&ehdr->e_phentsize); /* Program header table entry size */ 1462 bswap16s(&ehdr->e_phnum); /* Program header table entry count */ 1463 bswap16s(&ehdr->e_shentsize); /* Section header table entry size */ 1464 bswap16s(&ehdr->e_shnum); /* Section header table entry count */ 1465 bswap16s(&ehdr->e_shstrndx); /* Section header string table index */ 1466 } 1467 1468 static void bswap_phdr(struct elf_phdr *phdr, int phnum) 1469 { 1470 int i; 1471 for (i = 0; i < phnum; ++i, ++phdr) { 1472 bswap32s(&phdr->p_type); /* Segment type */ 1473 bswap32s(&phdr->p_flags); /* Segment flags */ 1474 bswaptls(&phdr->p_offset); /* Segment file offset */ 1475 bswaptls(&phdr->p_vaddr); /* Segment virtual address */ 1476 bswaptls(&phdr->p_paddr); /* Segment physical address */ 1477 bswaptls(&phdr->p_filesz); /* Segment size in file */ 1478 bswaptls(&phdr->p_memsz); /* Segment size in memory */ 1479 bswaptls(&phdr->p_align); /* Segment alignment */ 1480 } 1481 } 1482 1483 static void bswap_shdr(struct elf_shdr *shdr, int shnum) 1484 { 1485 int i; 1486 for (i = 0; i < shnum; ++i, ++shdr) { 1487 bswap32s(&shdr->sh_name); 1488 bswap32s(&shdr->sh_type); 1489 bswaptls(&shdr->sh_flags); 1490 bswaptls(&shdr->sh_addr); 1491 bswaptls(&shdr->sh_offset); 1492 bswaptls(&shdr->sh_size); 1493 bswap32s(&shdr->sh_link); 1494 bswap32s(&shdr->sh_info); 1495 bswaptls(&shdr->sh_addralign); 1496 bswaptls(&shdr->sh_entsize); 1497 } 1498 } 1499 1500 static void bswap_sym(struct elf_sym *sym) 1501 { 1502 bswap32s(&sym->st_name); 1503 bswaptls(&sym->st_value); 1504 bswaptls(&sym->st_size); 1505 bswap16s(&sym->st_shndx); 1506 } 1507 #else 1508 static inline void bswap_ehdr(struct elfhdr *ehdr) { } 1509 static inline void bswap_phdr(struct elf_phdr *phdr, int phnum) { } 1510 static inline void bswap_shdr(struct elf_shdr *shdr, int shnum) { } 1511 static inline void bswap_sym(struct elf_sym *sym) { } 1512 #endif 1513 1514 #ifdef USE_ELF_CORE_DUMP 1515 static int elf_core_dump(int, const CPUArchState *); 1516 #endif /* USE_ELF_CORE_DUMP */ 1517 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias); 1518 1519 /* Verify the portions of EHDR within E_IDENT for the target. 1520 This can be performed before bswapping the entire header. */ 1521 static bool elf_check_ident(struct elfhdr *ehdr) 1522 { 1523 return (ehdr->e_ident[EI_MAG0] == ELFMAG0 1524 && ehdr->e_ident[EI_MAG1] == ELFMAG1 1525 && ehdr->e_ident[EI_MAG2] == ELFMAG2 1526 && ehdr->e_ident[EI_MAG3] == ELFMAG3 1527 && ehdr->e_ident[EI_CLASS] == ELF_CLASS 1528 && ehdr->e_ident[EI_DATA] == ELF_DATA 1529 && ehdr->e_ident[EI_VERSION] == EV_CURRENT); 1530 } 1531 1532 /* Verify the portions of EHDR outside of E_IDENT for the target. 1533 This has to wait until after bswapping the header. */ 1534 static bool elf_check_ehdr(struct elfhdr *ehdr) 1535 { 1536 return (elf_check_arch(ehdr->e_machine) 1537 && ehdr->e_ehsize == sizeof(struct elfhdr) 1538 && ehdr->e_phentsize == sizeof(struct elf_phdr) 1539 && (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN)); 1540 } 1541 1542 /* 1543 * 'copy_elf_strings()' copies argument/envelope strings from user 1544 * memory to free pages in kernel mem. These are in a format ready 1545 * to be put directly into the top of new user memory. 1546 * 1547 */ 1548 static abi_ulong copy_elf_strings(int argc, char **argv, char *scratch, 1549 abi_ulong p, abi_ulong stack_limit) 1550 { 1551 char *tmp; 1552 int len, i; 1553 abi_ulong top = p; 1554 1555 if (!p) { 1556 return 0; /* bullet-proofing */ 1557 } 1558 1559 if (STACK_GROWS_DOWN) { 1560 int offset = ((p - 1) % TARGET_PAGE_SIZE) + 1; 1561 for (i = argc - 1; i >= 0; --i) { 1562 tmp = argv[i]; 1563 if (!tmp) { 1564 fprintf(stderr, "VFS: argc is wrong"); 1565 exit(-1); 1566 } 1567 len = strlen(tmp) + 1; 1568 tmp += len; 1569 1570 if (len > (p - stack_limit)) { 1571 return 0; 1572 } 1573 while (len) { 1574 int bytes_to_copy = (len > offset) ? offset : len; 1575 tmp -= bytes_to_copy; 1576 p -= bytes_to_copy; 1577 offset -= bytes_to_copy; 1578 len -= bytes_to_copy; 1579 1580 memcpy_fromfs(scratch + offset, tmp, bytes_to_copy); 1581 1582 if (offset == 0) { 1583 memcpy_to_target(p, scratch, top - p); 1584 top = p; 1585 offset = TARGET_PAGE_SIZE; 1586 } 1587 } 1588 } 1589 if (p != top) { 1590 memcpy_to_target(p, scratch + offset, top - p); 1591 } 1592 } else { 1593 int remaining = TARGET_PAGE_SIZE - (p % TARGET_PAGE_SIZE); 1594 for (i = 0; i < argc; ++i) { 1595 tmp = argv[i]; 1596 if (!tmp) { 1597 fprintf(stderr, "VFS: argc is wrong"); 1598 exit(-1); 1599 } 1600 len = strlen(tmp) + 1; 1601 if (len > (stack_limit - p)) { 1602 return 0; 1603 } 1604 while (len) { 1605 int bytes_to_copy = (len > remaining) ? remaining : len; 1606 1607 memcpy_fromfs(scratch + (p - top), tmp, bytes_to_copy); 1608 1609 tmp += bytes_to_copy; 1610 remaining -= bytes_to_copy; 1611 p += bytes_to_copy; 1612 len -= bytes_to_copy; 1613 1614 if (remaining == 0) { 1615 memcpy_to_target(top, scratch, p - top); 1616 top = p; 1617 remaining = TARGET_PAGE_SIZE; 1618 } 1619 } 1620 } 1621 if (p != top) { 1622 memcpy_to_target(top, scratch, p - top); 1623 } 1624 } 1625 1626 return p; 1627 } 1628 1629 /* Older linux kernels provide up to MAX_ARG_PAGES (default: 32) of 1630 * argument/environment space. Newer kernels (>2.6.33) allow more, 1631 * dependent on stack size, but guarantee at least 32 pages for 1632 * backwards compatibility. 1633 */ 1634 #define STACK_LOWER_LIMIT (32 * TARGET_PAGE_SIZE) 1635 1636 static abi_ulong setup_arg_pages(struct linux_binprm *bprm, 1637 struct image_info *info) 1638 { 1639 abi_ulong size, error, guard; 1640 1641 size = guest_stack_size; 1642 if (size < STACK_LOWER_LIMIT) { 1643 size = STACK_LOWER_LIMIT; 1644 } 1645 guard = TARGET_PAGE_SIZE; 1646 if (guard < qemu_real_host_page_size) { 1647 guard = qemu_real_host_page_size; 1648 } 1649 1650 error = target_mmap(0, size + guard, PROT_READ | PROT_WRITE, 1651 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 1652 if (error == -1) { 1653 perror("mmap stack"); 1654 exit(-1); 1655 } 1656 1657 /* We reserve one extra page at the top of the stack as guard. */ 1658 if (STACK_GROWS_DOWN) { 1659 target_mprotect(error, guard, PROT_NONE); 1660 info->stack_limit = error + guard; 1661 return info->stack_limit + size - sizeof(void *); 1662 } else { 1663 target_mprotect(error + size, guard, PROT_NONE); 1664 info->stack_limit = error + size; 1665 return error; 1666 } 1667 } 1668 1669 /* Map and zero the bss. We need to explicitly zero any fractional pages 1670 after the data section (i.e. bss). */ 1671 static void zero_bss(abi_ulong elf_bss, abi_ulong last_bss, int prot) 1672 { 1673 uintptr_t host_start, host_map_start, host_end; 1674 1675 last_bss = TARGET_PAGE_ALIGN(last_bss); 1676 1677 /* ??? There is confusion between qemu_real_host_page_size and 1678 qemu_host_page_size here and elsewhere in target_mmap, which 1679 may lead to the end of the data section mapping from the file 1680 not being mapped. At least there was an explicit test and 1681 comment for that here, suggesting that "the file size must 1682 be known". The comment probably pre-dates the introduction 1683 of the fstat system call in target_mmap which does in fact 1684 find out the size. What isn't clear is if the workaround 1685 here is still actually needed. For now, continue with it, 1686 but merge it with the "normal" mmap that would allocate the bss. */ 1687 1688 host_start = (uintptr_t) g2h(elf_bss); 1689 host_end = (uintptr_t) g2h(last_bss); 1690 host_map_start = REAL_HOST_PAGE_ALIGN(host_start); 1691 1692 if (host_map_start < host_end) { 1693 void *p = mmap((void *)host_map_start, host_end - host_map_start, 1694 prot, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 1695 if (p == MAP_FAILED) { 1696 perror("cannot mmap brk"); 1697 exit(-1); 1698 } 1699 } 1700 1701 /* Ensure that the bss page(s) are valid */ 1702 if ((page_get_flags(last_bss-1) & prot) != prot) { 1703 page_set_flags(elf_bss & TARGET_PAGE_MASK, last_bss, prot | PAGE_VALID); 1704 } 1705 1706 if (host_start < host_map_start) { 1707 memset((void *)host_start, 0, host_map_start - host_start); 1708 } 1709 } 1710 1711 #ifdef TARGET_ARM 1712 static int elf_is_fdpic(struct elfhdr *exec) 1713 { 1714 return exec->e_ident[EI_OSABI] == ELFOSABI_ARM_FDPIC; 1715 } 1716 #else 1717 /* Default implementation, always false. */ 1718 static int elf_is_fdpic(struct elfhdr *exec) 1719 { 1720 return 0; 1721 } 1722 #endif 1723 1724 static abi_ulong loader_build_fdpic_loadmap(struct image_info *info, abi_ulong sp) 1725 { 1726 uint16_t n; 1727 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs; 1728 1729 /* elf32_fdpic_loadseg */ 1730 n = info->nsegs; 1731 while (n--) { 1732 sp -= 12; 1733 put_user_u32(loadsegs[n].addr, sp+0); 1734 put_user_u32(loadsegs[n].p_vaddr, sp+4); 1735 put_user_u32(loadsegs[n].p_memsz, sp+8); 1736 } 1737 1738 /* elf32_fdpic_loadmap */ 1739 sp -= 4; 1740 put_user_u16(0, sp+0); /* version */ 1741 put_user_u16(info->nsegs, sp+2); /* nsegs */ 1742 1743 info->personality = PER_LINUX_FDPIC; 1744 info->loadmap_addr = sp; 1745 1746 return sp; 1747 } 1748 1749 static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc, 1750 struct elfhdr *exec, 1751 struct image_info *info, 1752 struct image_info *interp_info) 1753 { 1754 abi_ulong sp; 1755 abi_ulong u_argc, u_argv, u_envp, u_auxv; 1756 int size; 1757 int i; 1758 abi_ulong u_rand_bytes; 1759 uint8_t k_rand_bytes[16]; 1760 abi_ulong u_platform; 1761 const char *k_platform; 1762 const int n = sizeof(elf_addr_t); 1763 1764 sp = p; 1765 1766 /* Needs to be before we load the env/argc/... */ 1767 if (elf_is_fdpic(exec)) { 1768 /* Need 4 byte alignment for these structs */ 1769 sp &= ~3; 1770 sp = loader_build_fdpic_loadmap(info, sp); 1771 info->other_info = interp_info; 1772 if (interp_info) { 1773 interp_info->other_info = info; 1774 sp = loader_build_fdpic_loadmap(interp_info, sp); 1775 info->interpreter_loadmap_addr = interp_info->loadmap_addr; 1776 info->interpreter_pt_dynamic_addr = interp_info->pt_dynamic_addr; 1777 } else { 1778 info->interpreter_loadmap_addr = 0; 1779 info->interpreter_pt_dynamic_addr = 0; 1780 } 1781 } 1782 1783 u_platform = 0; 1784 k_platform = ELF_PLATFORM; 1785 if (k_platform) { 1786 size_t len = strlen(k_platform) + 1; 1787 if (STACK_GROWS_DOWN) { 1788 sp -= (len + n - 1) & ~(n - 1); 1789 u_platform = sp; 1790 /* FIXME - check return value of memcpy_to_target() for failure */ 1791 memcpy_to_target(sp, k_platform, len); 1792 } else { 1793 memcpy_to_target(sp, k_platform, len); 1794 u_platform = sp; 1795 sp += len + 1; 1796 } 1797 } 1798 1799 /* Provide 16 byte alignment for the PRNG, and basic alignment for 1800 * the argv and envp pointers. 1801 */ 1802 if (STACK_GROWS_DOWN) { 1803 sp = QEMU_ALIGN_DOWN(sp, 16); 1804 } else { 1805 sp = QEMU_ALIGN_UP(sp, 16); 1806 } 1807 1808 /* 1809 * Generate 16 random bytes for userspace PRNG seeding (not 1810 * cryptically secure but it's not the aim of QEMU). 1811 */ 1812 for (i = 0; i < 16; i++) { 1813 k_rand_bytes[i] = rand(); 1814 } 1815 if (STACK_GROWS_DOWN) { 1816 sp -= 16; 1817 u_rand_bytes = sp; 1818 /* FIXME - check return value of memcpy_to_target() for failure */ 1819 memcpy_to_target(sp, k_rand_bytes, 16); 1820 } else { 1821 memcpy_to_target(sp, k_rand_bytes, 16); 1822 u_rand_bytes = sp; 1823 sp += 16; 1824 } 1825 1826 size = (DLINFO_ITEMS + 1) * 2; 1827 if (k_platform) 1828 size += 2; 1829 #ifdef DLINFO_ARCH_ITEMS 1830 size += DLINFO_ARCH_ITEMS * 2; 1831 #endif 1832 #ifdef ELF_HWCAP2 1833 size += 2; 1834 #endif 1835 info->auxv_len = size * n; 1836 1837 size += envc + argc + 2; 1838 size += 1; /* argc itself */ 1839 size *= n; 1840 1841 /* Allocate space and finalize stack alignment for entry now. */ 1842 if (STACK_GROWS_DOWN) { 1843 u_argc = QEMU_ALIGN_DOWN(sp - size, STACK_ALIGNMENT); 1844 sp = u_argc; 1845 } else { 1846 u_argc = sp; 1847 sp = QEMU_ALIGN_UP(sp + size, STACK_ALIGNMENT); 1848 } 1849 1850 u_argv = u_argc + n; 1851 u_envp = u_argv + (argc + 1) * n; 1852 u_auxv = u_envp + (envc + 1) * n; 1853 info->saved_auxv = u_auxv; 1854 info->arg_start = u_argv; 1855 info->arg_end = u_argv + argc * n; 1856 1857 /* This is correct because Linux defines 1858 * elf_addr_t as Elf32_Off / Elf64_Off 1859 */ 1860 #define NEW_AUX_ENT(id, val) do { \ 1861 put_user_ual(id, u_auxv); u_auxv += n; \ 1862 put_user_ual(val, u_auxv); u_auxv += n; \ 1863 } while(0) 1864 1865 #ifdef ARCH_DLINFO 1866 /* 1867 * ARCH_DLINFO must come first so platform specific code can enforce 1868 * special alignment requirements on the AUXV if necessary (eg. PPC). 1869 */ 1870 ARCH_DLINFO; 1871 #endif 1872 /* There must be exactly DLINFO_ITEMS entries here, or the assert 1873 * on info->auxv_len will trigger. 1874 */ 1875 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff)); 1876 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr))); 1877 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); 1878 if ((info->alignment & ~qemu_host_page_mask) != 0) { 1879 /* Target doesn't support host page size alignment */ 1880 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); 1881 } else { 1882 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(MAX(TARGET_PAGE_SIZE, 1883 qemu_host_page_size))); 1884 } 1885 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_info ? interp_info->load_addr : 0)); 1886 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); 1887 NEW_AUX_ENT(AT_ENTRY, info->entry); 1888 NEW_AUX_ENT(AT_UID, (abi_ulong) getuid()); 1889 NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid()); 1890 NEW_AUX_ENT(AT_GID, (abi_ulong) getgid()); 1891 NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid()); 1892 NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP); 1893 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK)); 1894 NEW_AUX_ENT(AT_RANDOM, (abi_ulong) u_rand_bytes); 1895 NEW_AUX_ENT(AT_SECURE, (abi_ulong) qemu_getauxval(AT_SECURE)); 1896 1897 #ifdef ELF_HWCAP2 1898 NEW_AUX_ENT(AT_HWCAP2, (abi_ulong) ELF_HWCAP2); 1899 #endif 1900 1901 if (u_platform) { 1902 NEW_AUX_ENT(AT_PLATFORM, u_platform); 1903 } 1904 NEW_AUX_ENT (AT_NULL, 0); 1905 #undef NEW_AUX_ENT 1906 1907 /* Check that our initial calculation of the auxv length matches how much 1908 * we actually put into it. 1909 */ 1910 assert(info->auxv_len == u_auxv - info->saved_auxv); 1911 1912 put_user_ual(argc, u_argc); 1913 1914 p = info->arg_strings; 1915 for (i = 0; i < argc; ++i) { 1916 put_user_ual(p, u_argv); 1917 u_argv += n; 1918 p += target_strlen(p) + 1; 1919 } 1920 put_user_ual(0, u_argv); 1921 1922 p = info->env_strings; 1923 for (i = 0; i < envc; ++i) { 1924 put_user_ual(p, u_envp); 1925 u_envp += n; 1926 p += target_strlen(p) + 1; 1927 } 1928 put_user_ual(0, u_envp); 1929 1930 return sp; 1931 } 1932 1933 unsigned long init_guest_space(unsigned long host_start, 1934 unsigned long host_size, 1935 unsigned long guest_start, 1936 bool fixed) 1937 { 1938 unsigned long current_start, aligned_start; 1939 int flags; 1940 1941 assert(host_start || host_size); 1942 1943 /* If just a starting address is given, then just verify that 1944 * address. */ 1945 if (host_start && !host_size) { 1946 #if defined(TARGET_ARM) && !defined(TARGET_AARCH64) 1947 if (init_guest_commpage(host_start, host_size) != 1) { 1948 return (unsigned long)-1; 1949 } 1950 #endif 1951 return host_start; 1952 } 1953 1954 /* Setup the initial flags and start address. */ 1955 current_start = host_start & qemu_host_page_mask; 1956 flags = MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE; 1957 if (fixed) { 1958 flags |= MAP_FIXED; 1959 } 1960 1961 /* Otherwise, a non-zero size region of memory needs to be mapped 1962 * and validated. */ 1963 1964 #if defined(TARGET_ARM) && !defined(TARGET_AARCH64) 1965 /* On 32-bit ARM, we need to map not just the usable memory, but 1966 * also the commpage. Try to find a suitable place by allocating 1967 * a big chunk for all of it. If host_start, then the naive 1968 * strategy probably does good enough. 1969 */ 1970 if (!host_start) { 1971 unsigned long guest_full_size, host_full_size, real_start; 1972 1973 guest_full_size = 1974 (0xffff0f00 & qemu_host_page_mask) + qemu_host_page_size; 1975 host_full_size = guest_full_size - guest_start; 1976 real_start = (unsigned long) 1977 mmap(NULL, host_full_size, PROT_NONE, flags, -1, 0); 1978 if (real_start == (unsigned long)-1) { 1979 if (host_size < host_full_size - qemu_host_page_size) { 1980 /* We failed to map a continous segment, but we're 1981 * allowed to have a gap between the usable memory and 1982 * the commpage where other things can be mapped. 1983 * This sparseness gives us more flexibility to find 1984 * an address range. 1985 */ 1986 goto naive; 1987 } 1988 return (unsigned long)-1; 1989 } 1990 munmap((void *)real_start, host_full_size); 1991 if (real_start & ~qemu_host_page_mask) { 1992 /* The same thing again, but with an extra qemu_host_page_size 1993 * so that we can shift around alignment. 1994 */ 1995 unsigned long real_size = host_full_size + qemu_host_page_size; 1996 real_start = (unsigned long) 1997 mmap(NULL, real_size, PROT_NONE, flags, -1, 0); 1998 if (real_start == (unsigned long)-1) { 1999 if (host_size < host_full_size - qemu_host_page_size) { 2000 goto naive; 2001 } 2002 return (unsigned long)-1; 2003 } 2004 munmap((void *)real_start, real_size); 2005 real_start = HOST_PAGE_ALIGN(real_start); 2006 } 2007 current_start = real_start; 2008 } 2009 naive: 2010 #endif 2011 2012 while (1) { 2013 unsigned long real_start, real_size, aligned_size; 2014 aligned_size = real_size = host_size; 2015 2016 /* Do not use mmap_find_vma here because that is limited to the 2017 * guest address space. We are going to make the 2018 * guest address space fit whatever we're given. 2019 */ 2020 real_start = (unsigned long) 2021 mmap((void *)current_start, host_size, PROT_NONE, flags, -1, 0); 2022 if (real_start == (unsigned long)-1) { 2023 return (unsigned long)-1; 2024 } 2025 2026 /* Check to see if the address is valid. */ 2027 if (host_start && real_start != current_start) { 2028 goto try_again; 2029 } 2030 2031 /* Ensure the address is properly aligned. */ 2032 if (real_start & ~qemu_host_page_mask) { 2033 /* Ideally, we adjust like 2034 * 2035 * pages: [ ][ ][ ][ ][ ] 2036 * old: [ real ] 2037 * [ aligned ] 2038 * new: [ real ] 2039 * [ aligned ] 2040 * 2041 * But if there is something else mapped right after it, 2042 * then obviously it won't have room to grow, and the 2043 * kernel will put the new larger real someplace else with 2044 * unknown alignment (if we made it to here, then 2045 * fixed=false). Which is why we grow real by a full page 2046 * size, instead of by part of one; so that even if we get 2047 * moved, we can still guarantee alignment. But this does 2048 * mean that there is a padding of < 1 page both before 2049 * and after the aligned range; the "after" could could 2050 * cause problems for ARM emulation where it could butt in 2051 * to where we need to put the commpage. 2052 */ 2053 munmap((void *)real_start, host_size); 2054 real_size = aligned_size + qemu_host_page_size; 2055 real_start = (unsigned long) 2056 mmap((void *)real_start, real_size, PROT_NONE, flags, -1, 0); 2057 if (real_start == (unsigned long)-1) { 2058 return (unsigned long)-1; 2059 } 2060 aligned_start = HOST_PAGE_ALIGN(real_start); 2061 } else { 2062 aligned_start = real_start; 2063 } 2064 2065 #if defined(TARGET_ARM) && !defined(TARGET_AARCH64) 2066 /* On 32-bit ARM, we need to also be able to map the commpage. */ 2067 int valid = init_guest_commpage(aligned_start - guest_start, 2068 aligned_size + guest_start); 2069 if (valid == -1) { 2070 munmap((void *)real_start, real_size); 2071 return (unsigned long)-1; 2072 } else if (valid == 0) { 2073 goto try_again; 2074 } 2075 #endif 2076 2077 /* If nothing has said `return -1` or `goto try_again` yet, 2078 * then the address we have is good. 2079 */ 2080 break; 2081 2082 try_again: 2083 /* That address didn't work. Unmap and try a different one. 2084 * The address the host picked because is typically right at 2085 * the top of the host address space and leaves the guest with 2086 * no usable address space. Resort to a linear search. We 2087 * already compensated for mmap_min_addr, so this should not 2088 * happen often. Probably means we got unlucky and host 2089 * address space randomization put a shared library somewhere 2090 * inconvenient. 2091 * 2092 * This is probably a good strategy if host_start, but is 2093 * probably a bad strategy if not, which means we got here 2094 * because of trouble with ARM commpage setup. 2095 */ 2096 munmap((void *)real_start, real_size); 2097 current_start += qemu_host_page_size; 2098 if (host_start == current_start) { 2099 /* Theoretically possible if host doesn't have any suitably 2100 * aligned areas. Normally the first mmap will fail. 2101 */ 2102 return (unsigned long)-1; 2103 } 2104 } 2105 2106 qemu_log_mask(CPU_LOG_PAGE, "Reserved 0x%lx bytes of guest address space\n", host_size); 2107 2108 return aligned_start; 2109 } 2110 2111 static void probe_guest_base(const char *image_name, 2112 abi_ulong loaddr, abi_ulong hiaddr) 2113 { 2114 /* Probe for a suitable guest base address, if the user has not set 2115 * it explicitly, and set guest_base appropriately. 2116 * In case of error we will print a suitable message and exit. 2117 */ 2118 const char *errmsg; 2119 if (!have_guest_base && !reserved_va) { 2120 unsigned long host_start, real_start, host_size; 2121 2122 /* Round addresses to page boundaries. */ 2123 loaddr &= qemu_host_page_mask; 2124 hiaddr = HOST_PAGE_ALIGN(hiaddr); 2125 2126 if (loaddr < mmap_min_addr) { 2127 host_start = HOST_PAGE_ALIGN(mmap_min_addr); 2128 } else { 2129 host_start = loaddr; 2130 if (host_start != loaddr) { 2131 errmsg = "Address overflow loading ELF binary"; 2132 goto exit_errmsg; 2133 } 2134 } 2135 host_size = hiaddr - loaddr; 2136 2137 /* Setup the initial guest memory space with ranges gleaned from 2138 * the ELF image that is being loaded. 2139 */ 2140 real_start = init_guest_space(host_start, host_size, loaddr, false); 2141 if (real_start == (unsigned long)-1) { 2142 errmsg = "Unable to find space for application"; 2143 goto exit_errmsg; 2144 } 2145 guest_base = real_start - loaddr; 2146 2147 qemu_log_mask(CPU_LOG_PAGE, "Relocating guest address space from 0x" 2148 TARGET_ABI_FMT_lx " to 0x%lx\n", 2149 loaddr, real_start); 2150 } 2151 return; 2152 2153 exit_errmsg: 2154 fprintf(stderr, "%s: %s\n", image_name, errmsg); 2155 exit(-1); 2156 } 2157 2158 2159 /* Load an ELF image into the address space. 2160 2161 IMAGE_NAME is the filename of the image, to use in error messages. 2162 IMAGE_FD is the open file descriptor for the image. 2163 2164 BPRM_BUF is a copy of the beginning of the file; this of course 2165 contains the elf file header at offset 0. It is assumed that this 2166 buffer is sufficiently aligned to present no problems to the host 2167 in accessing data at aligned offsets within the buffer. 2168 2169 On return: INFO values will be filled in, as necessary or available. */ 2170 2171 static void load_elf_image(const char *image_name, int image_fd, 2172 struct image_info *info, char **pinterp_name, 2173 char bprm_buf[BPRM_BUF_SIZE]) 2174 { 2175 struct elfhdr *ehdr = (struct elfhdr *)bprm_buf; 2176 struct elf_phdr *phdr; 2177 abi_ulong load_addr, load_bias, loaddr, hiaddr, error; 2178 int i, retval; 2179 const char *errmsg; 2180 2181 /* First of all, some simple consistency checks */ 2182 errmsg = "Invalid ELF image for this architecture"; 2183 if (!elf_check_ident(ehdr)) { 2184 goto exit_errmsg; 2185 } 2186 bswap_ehdr(ehdr); 2187 if (!elf_check_ehdr(ehdr)) { 2188 goto exit_errmsg; 2189 } 2190 2191 i = ehdr->e_phnum * sizeof(struct elf_phdr); 2192 if (ehdr->e_phoff + i <= BPRM_BUF_SIZE) { 2193 phdr = (struct elf_phdr *)(bprm_buf + ehdr->e_phoff); 2194 } else { 2195 phdr = (struct elf_phdr *) alloca(i); 2196 retval = pread(image_fd, phdr, i, ehdr->e_phoff); 2197 if (retval != i) { 2198 goto exit_read; 2199 } 2200 } 2201 bswap_phdr(phdr, ehdr->e_phnum); 2202 2203 info->nsegs = 0; 2204 info->pt_dynamic_addr = 0; 2205 2206 mmap_lock(); 2207 2208 /* Find the maximum size of the image and allocate an appropriate 2209 amount of memory to handle that. */ 2210 loaddr = -1, hiaddr = 0; 2211 info->alignment = 0; 2212 for (i = 0; i < ehdr->e_phnum; ++i) { 2213 if (phdr[i].p_type == PT_LOAD) { 2214 abi_ulong a = phdr[i].p_vaddr - phdr[i].p_offset; 2215 if (a < loaddr) { 2216 loaddr = a; 2217 } 2218 a = phdr[i].p_vaddr + phdr[i].p_memsz; 2219 if (a > hiaddr) { 2220 hiaddr = a; 2221 } 2222 ++info->nsegs; 2223 info->alignment |= phdr[i].p_align; 2224 } 2225 } 2226 2227 load_addr = loaddr; 2228 if (ehdr->e_type == ET_DYN) { 2229 /* The image indicates that it can be loaded anywhere. Find a 2230 location that can hold the memory space required. If the 2231 image is pre-linked, LOADDR will be non-zero. Since we do 2232 not supply MAP_FIXED here we'll use that address if and 2233 only if it remains available. */ 2234 load_addr = target_mmap(loaddr, hiaddr - loaddr, PROT_NONE, 2235 MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, 2236 -1, 0); 2237 if (load_addr == -1) { 2238 goto exit_perror; 2239 } 2240 } else if (pinterp_name != NULL) { 2241 /* This is the main executable. Make sure that the low 2242 address does not conflict with MMAP_MIN_ADDR or the 2243 QEMU application itself. */ 2244 probe_guest_base(image_name, loaddr, hiaddr); 2245 } 2246 load_bias = load_addr - loaddr; 2247 2248 if (elf_is_fdpic(ehdr)) { 2249 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs = 2250 g_malloc(sizeof(*loadsegs) * info->nsegs); 2251 2252 for (i = 0; i < ehdr->e_phnum; ++i) { 2253 switch (phdr[i].p_type) { 2254 case PT_DYNAMIC: 2255 info->pt_dynamic_addr = phdr[i].p_vaddr + load_bias; 2256 break; 2257 case PT_LOAD: 2258 loadsegs->addr = phdr[i].p_vaddr + load_bias; 2259 loadsegs->p_vaddr = phdr[i].p_vaddr; 2260 loadsegs->p_memsz = phdr[i].p_memsz; 2261 ++loadsegs; 2262 break; 2263 } 2264 } 2265 } 2266 2267 info->load_bias = load_bias; 2268 info->load_addr = load_addr; 2269 info->entry = ehdr->e_entry + load_bias; 2270 info->start_code = -1; 2271 info->end_code = 0; 2272 info->start_data = -1; 2273 info->end_data = 0; 2274 info->brk = 0; 2275 info->elf_flags = ehdr->e_flags; 2276 2277 for (i = 0; i < ehdr->e_phnum; i++) { 2278 struct elf_phdr *eppnt = phdr + i; 2279 if (eppnt->p_type == PT_LOAD) { 2280 abi_ulong vaddr, vaddr_po, vaddr_ps, vaddr_ef, vaddr_em; 2281 int elf_prot = 0; 2282 2283 if (eppnt->p_flags & PF_R) elf_prot = PROT_READ; 2284 if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; 2285 if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; 2286 2287 vaddr = load_bias + eppnt->p_vaddr; 2288 vaddr_po = TARGET_ELF_PAGEOFFSET(vaddr); 2289 vaddr_ps = TARGET_ELF_PAGESTART(vaddr); 2290 2291 error = target_mmap(vaddr_ps, eppnt->p_filesz + vaddr_po, 2292 elf_prot, MAP_PRIVATE | MAP_FIXED, 2293 image_fd, eppnt->p_offset - vaddr_po); 2294 if (error == -1) { 2295 goto exit_perror; 2296 } 2297 2298 vaddr_ef = vaddr + eppnt->p_filesz; 2299 vaddr_em = vaddr + eppnt->p_memsz; 2300 2301 /* If the load segment requests extra zeros (e.g. bss), map it. */ 2302 if (vaddr_ef < vaddr_em) { 2303 zero_bss(vaddr_ef, vaddr_em, elf_prot); 2304 } 2305 2306 /* Find the full program boundaries. */ 2307 if (elf_prot & PROT_EXEC) { 2308 if (vaddr < info->start_code) { 2309 info->start_code = vaddr; 2310 } 2311 if (vaddr_ef > info->end_code) { 2312 info->end_code = vaddr_ef; 2313 } 2314 } 2315 if (elf_prot & PROT_WRITE) { 2316 if (vaddr < info->start_data) { 2317 info->start_data = vaddr; 2318 } 2319 if (vaddr_ef > info->end_data) { 2320 info->end_data = vaddr_ef; 2321 } 2322 if (vaddr_em > info->brk) { 2323 info->brk = vaddr_em; 2324 } 2325 } 2326 } else if (eppnt->p_type == PT_INTERP && pinterp_name) { 2327 char *interp_name; 2328 2329 if (*pinterp_name) { 2330 errmsg = "Multiple PT_INTERP entries"; 2331 goto exit_errmsg; 2332 } 2333 interp_name = malloc(eppnt->p_filesz); 2334 if (!interp_name) { 2335 goto exit_perror; 2336 } 2337 2338 if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) { 2339 memcpy(interp_name, bprm_buf + eppnt->p_offset, 2340 eppnt->p_filesz); 2341 } else { 2342 retval = pread(image_fd, interp_name, eppnt->p_filesz, 2343 eppnt->p_offset); 2344 if (retval != eppnt->p_filesz) { 2345 goto exit_perror; 2346 } 2347 } 2348 if (interp_name[eppnt->p_filesz - 1] != 0) { 2349 errmsg = "Invalid PT_INTERP entry"; 2350 goto exit_errmsg; 2351 } 2352 *pinterp_name = interp_name; 2353 } 2354 } 2355 2356 if (info->end_data == 0) { 2357 info->start_data = info->end_code; 2358 info->end_data = info->end_code; 2359 info->brk = info->end_code; 2360 } 2361 2362 if (qemu_log_enabled()) { 2363 load_symbols(ehdr, image_fd, load_bias); 2364 } 2365 2366 mmap_unlock(); 2367 2368 close(image_fd); 2369 return; 2370 2371 exit_read: 2372 if (retval >= 0) { 2373 errmsg = "Incomplete read of file header"; 2374 goto exit_errmsg; 2375 } 2376 exit_perror: 2377 errmsg = strerror(errno); 2378 exit_errmsg: 2379 fprintf(stderr, "%s: %s\n", image_name, errmsg); 2380 exit(-1); 2381 } 2382 2383 static void load_elf_interp(const char *filename, struct image_info *info, 2384 char bprm_buf[BPRM_BUF_SIZE]) 2385 { 2386 int fd, retval; 2387 2388 fd = open(path(filename), O_RDONLY); 2389 if (fd < 0) { 2390 goto exit_perror; 2391 } 2392 2393 retval = read(fd, bprm_buf, BPRM_BUF_SIZE); 2394 if (retval < 0) { 2395 goto exit_perror; 2396 } 2397 if (retval < BPRM_BUF_SIZE) { 2398 memset(bprm_buf + retval, 0, BPRM_BUF_SIZE - retval); 2399 } 2400 2401 load_elf_image(filename, fd, info, NULL, bprm_buf); 2402 return; 2403 2404 exit_perror: 2405 fprintf(stderr, "%s: %s\n", filename, strerror(errno)); 2406 exit(-1); 2407 } 2408 2409 static int symfind(const void *s0, const void *s1) 2410 { 2411 target_ulong addr = *(target_ulong *)s0; 2412 struct elf_sym *sym = (struct elf_sym *)s1; 2413 int result = 0; 2414 if (addr < sym->st_value) { 2415 result = -1; 2416 } else if (addr >= sym->st_value + sym->st_size) { 2417 result = 1; 2418 } 2419 return result; 2420 } 2421 2422 static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr) 2423 { 2424 #if ELF_CLASS == ELFCLASS32 2425 struct elf_sym *syms = s->disas_symtab.elf32; 2426 #else 2427 struct elf_sym *syms = s->disas_symtab.elf64; 2428 #endif 2429 2430 // binary search 2431 struct elf_sym *sym; 2432 2433 sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind); 2434 if (sym != NULL) { 2435 return s->disas_strtab + sym->st_name; 2436 } 2437 2438 return ""; 2439 } 2440 2441 /* FIXME: This should use elf_ops.h */ 2442 static int symcmp(const void *s0, const void *s1) 2443 { 2444 struct elf_sym *sym0 = (struct elf_sym *)s0; 2445 struct elf_sym *sym1 = (struct elf_sym *)s1; 2446 return (sym0->st_value < sym1->st_value) 2447 ? -1 2448 : ((sym0->st_value > sym1->st_value) ? 1 : 0); 2449 } 2450 2451 /* Best attempt to load symbols from this ELF object. */ 2452 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias) 2453 { 2454 int i, shnum, nsyms, sym_idx = 0, str_idx = 0; 2455 uint64_t segsz; 2456 struct elf_shdr *shdr; 2457 char *strings = NULL; 2458 struct syminfo *s = NULL; 2459 struct elf_sym *new_syms, *syms = NULL; 2460 2461 shnum = hdr->e_shnum; 2462 i = shnum * sizeof(struct elf_shdr); 2463 shdr = (struct elf_shdr *)alloca(i); 2464 if (pread(fd, shdr, i, hdr->e_shoff) != i) { 2465 return; 2466 } 2467 2468 bswap_shdr(shdr, shnum); 2469 for (i = 0; i < shnum; ++i) { 2470 if (shdr[i].sh_type == SHT_SYMTAB) { 2471 sym_idx = i; 2472 str_idx = shdr[i].sh_link; 2473 goto found; 2474 } 2475 } 2476 2477 /* There will be no symbol table if the file was stripped. */ 2478 return; 2479 2480 found: 2481 /* Now know where the strtab and symtab are. Snarf them. */ 2482 s = g_try_new(struct syminfo, 1); 2483 if (!s) { 2484 goto give_up; 2485 } 2486 2487 segsz = shdr[str_idx].sh_size; 2488 s->disas_strtab = strings = g_try_malloc(segsz); 2489 if (!strings || 2490 pread(fd, strings, segsz, shdr[str_idx].sh_offset) != segsz) { 2491 goto give_up; 2492 } 2493 2494 segsz = shdr[sym_idx].sh_size; 2495 syms = g_try_malloc(segsz); 2496 if (!syms || pread(fd, syms, segsz, shdr[sym_idx].sh_offset) != segsz) { 2497 goto give_up; 2498 } 2499 2500 if (segsz / sizeof(struct elf_sym) > INT_MAX) { 2501 /* Implausibly large symbol table: give up rather than ploughing 2502 * on with the number of symbols calculation overflowing 2503 */ 2504 goto give_up; 2505 } 2506 nsyms = segsz / sizeof(struct elf_sym); 2507 for (i = 0; i < nsyms; ) { 2508 bswap_sym(syms + i); 2509 /* Throw away entries which we do not need. */ 2510 if (syms[i].st_shndx == SHN_UNDEF 2511 || syms[i].st_shndx >= SHN_LORESERVE 2512 || ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) { 2513 if (i < --nsyms) { 2514 syms[i] = syms[nsyms]; 2515 } 2516 } else { 2517 #if defined(TARGET_ARM) || defined (TARGET_MIPS) 2518 /* The bottom address bit marks a Thumb or MIPS16 symbol. */ 2519 syms[i].st_value &= ~(target_ulong)1; 2520 #endif 2521 syms[i].st_value += load_bias; 2522 i++; 2523 } 2524 } 2525 2526 /* No "useful" symbol. */ 2527 if (nsyms == 0) { 2528 goto give_up; 2529 } 2530 2531 /* Attempt to free the storage associated with the local symbols 2532 that we threw away. Whether or not this has any effect on the 2533 memory allocation depends on the malloc implementation and how 2534 many symbols we managed to discard. */ 2535 new_syms = g_try_renew(struct elf_sym, syms, nsyms); 2536 if (new_syms == NULL) { 2537 goto give_up; 2538 } 2539 syms = new_syms; 2540 2541 qsort(syms, nsyms, sizeof(*syms), symcmp); 2542 2543 s->disas_num_syms = nsyms; 2544 #if ELF_CLASS == ELFCLASS32 2545 s->disas_symtab.elf32 = syms; 2546 #else 2547 s->disas_symtab.elf64 = syms; 2548 #endif 2549 s->lookup_symbol = lookup_symbolxx; 2550 s->next = syminfos; 2551 syminfos = s; 2552 2553 return; 2554 2555 give_up: 2556 g_free(s); 2557 g_free(strings); 2558 g_free(syms); 2559 } 2560 2561 uint32_t get_elf_eflags(int fd) 2562 { 2563 struct elfhdr ehdr; 2564 off_t offset; 2565 int ret; 2566 2567 /* Read ELF header */ 2568 offset = lseek(fd, 0, SEEK_SET); 2569 if (offset == (off_t) -1) { 2570 return 0; 2571 } 2572 ret = read(fd, &ehdr, sizeof(ehdr)); 2573 if (ret < sizeof(ehdr)) { 2574 return 0; 2575 } 2576 offset = lseek(fd, offset, SEEK_SET); 2577 if (offset == (off_t) -1) { 2578 return 0; 2579 } 2580 2581 /* Check ELF signature */ 2582 if (!elf_check_ident(&ehdr)) { 2583 return 0; 2584 } 2585 2586 /* check header */ 2587 bswap_ehdr(&ehdr); 2588 if (!elf_check_ehdr(&ehdr)) { 2589 return 0; 2590 } 2591 2592 /* return architecture id */ 2593 return ehdr.e_flags; 2594 } 2595 2596 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info) 2597 { 2598 struct image_info interp_info; 2599 struct elfhdr elf_ex; 2600 char *elf_interpreter = NULL; 2601 char *scratch; 2602 2603 info->start_mmap = (abi_ulong)ELF_START_MMAP; 2604 2605 load_elf_image(bprm->filename, bprm->fd, info, 2606 &elf_interpreter, bprm->buf); 2607 2608 /* ??? We need a copy of the elf header for passing to create_elf_tables. 2609 If we do nothing, we'll have overwritten this when we re-use bprm->buf 2610 when we load the interpreter. */ 2611 elf_ex = *(struct elfhdr *)bprm->buf; 2612 2613 /* Do this so that we can load the interpreter, if need be. We will 2614 change some of these later */ 2615 bprm->p = setup_arg_pages(bprm, info); 2616 2617 scratch = g_new0(char, TARGET_PAGE_SIZE); 2618 if (STACK_GROWS_DOWN) { 2619 bprm->p = copy_elf_strings(1, &bprm->filename, scratch, 2620 bprm->p, info->stack_limit); 2621 info->file_string = bprm->p; 2622 bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch, 2623 bprm->p, info->stack_limit); 2624 info->env_strings = bprm->p; 2625 bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch, 2626 bprm->p, info->stack_limit); 2627 info->arg_strings = bprm->p; 2628 } else { 2629 info->arg_strings = bprm->p; 2630 bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch, 2631 bprm->p, info->stack_limit); 2632 info->env_strings = bprm->p; 2633 bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch, 2634 bprm->p, info->stack_limit); 2635 info->file_string = bprm->p; 2636 bprm->p = copy_elf_strings(1, &bprm->filename, scratch, 2637 bprm->p, info->stack_limit); 2638 } 2639 2640 g_free(scratch); 2641 2642 if (!bprm->p) { 2643 fprintf(stderr, "%s: %s\n", bprm->filename, strerror(E2BIG)); 2644 exit(-1); 2645 } 2646 2647 if (elf_interpreter) { 2648 load_elf_interp(elf_interpreter, &interp_info, bprm->buf); 2649 2650 /* If the program interpreter is one of these two, then assume 2651 an iBCS2 image. Otherwise assume a native linux image. */ 2652 2653 if (strcmp(elf_interpreter, "/usr/lib/libc.so.1") == 0 2654 || strcmp(elf_interpreter, "/usr/lib/ld.so.1") == 0) { 2655 info->personality = PER_SVR4; 2656 2657 /* Why this, you ask??? Well SVr4 maps page 0 as read-only, 2658 and some applications "depend" upon this behavior. Since 2659 we do not have the power to recompile these, we emulate 2660 the SVr4 behavior. Sigh. */ 2661 target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC, 2662 MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 2663 } 2664 } 2665 2666 bprm->p = create_elf_tables(bprm->p, bprm->argc, bprm->envc, &elf_ex, 2667 info, (elf_interpreter ? &interp_info : NULL)); 2668 info->start_stack = bprm->p; 2669 2670 /* If we have an interpreter, set that as the program's entry point. 2671 Copy the load_bias as well, to help PPC64 interpret the entry 2672 point as a function descriptor. Do this after creating elf tables 2673 so that we copy the original program entry point into the AUXV. */ 2674 if (elf_interpreter) { 2675 info->load_bias = interp_info.load_bias; 2676 info->entry = interp_info.entry; 2677 free(elf_interpreter); 2678 } 2679 2680 #ifdef USE_ELF_CORE_DUMP 2681 bprm->core_dump = &elf_core_dump; 2682 #endif 2683 2684 return 0; 2685 } 2686 2687 #ifdef USE_ELF_CORE_DUMP 2688 /* 2689 * Definitions to generate Intel SVR4-like core files. 2690 * These mostly have the same names as the SVR4 types with "target_elf_" 2691 * tacked on the front to prevent clashes with linux definitions, 2692 * and the typedef forms have been avoided. This is mostly like 2693 * the SVR4 structure, but more Linuxy, with things that Linux does 2694 * not support and which gdb doesn't really use excluded. 2695 * 2696 * Fields we don't dump (their contents is zero) in linux-user qemu 2697 * are marked with XXX. 2698 * 2699 * Core dump code is copied from linux kernel (fs/binfmt_elf.c). 2700 * 2701 * Porting ELF coredump for target is (quite) simple process. First you 2702 * define USE_ELF_CORE_DUMP in target ELF code (where init_thread() for 2703 * the target resides): 2704 * 2705 * #define USE_ELF_CORE_DUMP 2706 * 2707 * Next you define type of register set used for dumping. ELF specification 2708 * says that it needs to be array of elf_greg_t that has size of ELF_NREG. 2709 * 2710 * typedef <target_regtype> target_elf_greg_t; 2711 * #define ELF_NREG <number of registers> 2712 * typedef taret_elf_greg_t target_elf_gregset_t[ELF_NREG]; 2713 * 2714 * Last step is to implement target specific function that copies registers 2715 * from given cpu into just specified register set. Prototype is: 2716 * 2717 * static void elf_core_copy_regs(taret_elf_gregset_t *regs, 2718 * const CPUArchState *env); 2719 * 2720 * Parameters: 2721 * regs - copy register values into here (allocated and zeroed by caller) 2722 * env - copy registers from here 2723 * 2724 * Example for ARM target is provided in this file. 2725 */ 2726 2727 /* An ELF note in memory */ 2728 struct memelfnote { 2729 const char *name; 2730 size_t namesz; 2731 size_t namesz_rounded; 2732 int type; 2733 size_t datasz; 2734 size_t datasz_rounded; 2735 void *data; 2736 size_t notesz; 2737 }; 2738 2739 struct target_elf_siginfo { 2740 abi_int si_signo; /* signal number */ 2741 abi_int si_code; /* extra code */ 2742 abi_int si_errno; /* errno */ 2743 }; 2744 2745 struct target_elf_prstatus { 2746 struct target_elf_siginfo pr_info; /* Info associated with signal */ 2747 abi_short pr_cursig; /* Current signal */ 2748 abi_ulong pr_sigpend; /* XXX */ 2749 abi_ulong pr_sighold; /* XXX */ 2750 target_pid_t pr_pid; 2751 target_pid_t pr_ppid; 2752 target_pid_t pr_pgrp; 2753 target_pid_t pr_sid; 2754 struct target_timeval pr_utime; /* XXX User time */ 2755 struct target_timeval pr_stime; /* XXX System time */ 2756 struct target_timeval pr_cutime; /* XXX Cumulative user time */ 2757 struct target_timeval pr_cstime; /* XXX Cumulative system time */ 2758 target_elf_gregset_t pr_reg; /* GP registers */ 2759 abi_int pr_fpvalid; /* XXX */ 2760 }; 2761 2762 #define ELF_PRARGSZ (80) /* Number of chars for args */ 2763 2764 struct target_elf_prpsinfo { 2765 char pr_state; /* numeric process state */ 2766 char pr_sname; /* char for pr_state */ 2767 char pr_zomb; /* zombie */ 2768 char pr_nice; /* nice val */ 2769 abi_ulong pr_flag; /* flags */ 2770 target_uid_t pr_uid; 2771 target_gid_t pr_gid; 2772 target_pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid; 2773 /* Lots missing */ 2774 char pr_fname[16]; /* filename of executable */ 2775 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */ 2776 }; 2777 2778 /* Here is the structure in which status of each thread is captured. */ 2779 struct elf_thread_status { 2780 QTAILQ_ENTRY(elf_thread_status) ets_link; 2781 struct target_elf_prstatus prstatus; /* NT_PRSTATUS */ 2782 #if 0 2783 elf_fpregset_t fpu; /* NT_PRFPREG */ 2784 struct task_struct *thread; 2785 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ 2786 #endif 2787 struct memelfnote notes[1]; 2788 int num_notes; 2789 }; 2790 2791 struct elf_note_info { 2792 struct memelfnote *notes; 2793 struct target_elf_prstatus *prstatus; /* NT_PRSTATUS */ 2794 struct target_elf_prpsinfo *psinfo; /* NT_PRPSINFO */ 2795 2796 QTAILQ_HEAD(thread_list_head, elf_thread_status) thread_list; 2797 #if 0 2798 /* 2799 * Current version of ELF coredump doesn't support 2800 * dumping fp regs etc. 2801 */ 2802 elf_fpregset_t *fpu; 2803 elf_fpxregset_t *xfpu; 2804 int thread_status_size; 2805 #endif 2806 int notes_size; 2807 int numnote; 2808 }; 2809 2810 struct vm_area_struct { 2811 target_ulong vma_start; /* start vaddr of memory region */ 2812 target_ulong vma_end; /* end vaddr of memory region */ 2813 abi_ulong vma_flags; /* protection etc. flags for the region */ 2814 QTAILQ_ENTRY(vm_area_struct) vma_link; 2815 }; 2816 2817 struct mm_struct { 2818 QTAILQ_HEAD(, vm_area_struct) mm_mmap; 2819 int mm_count; /* number of mappings */ 2820 }; 2821 2822 static struct mm_struct *vma_init(void); 2823 static void vma_delete(struct mm_struct *); 2824 static int vma_add_mapping(struct mm_struct *, target_ulong, 2825 target_ulong, abi_ulong); 2826 static int vma_get_mapping_count(const struct mm_struct *); 2827 static struct vm_area_struct *vma_first(const struct mm_struct *); 2828 static struct vm_area_struct *vma_next(struct vm_area_struct *); 2829 static abi_ulong vma_dump_size(const struct vm_area_struct *); 2830 static int vma_walker(void *priv, target_ulong start, target_ulong end, 2831 unsigned long flags); 2832 2833 static void fill_elf_header(struct elfhdr *, int, uint16_t, uint32_t); 2834 static void fill_note(struct memelfnote *, const char *, int, 2835 unsigned int, void *); 2836 static void fill_prstatus(struct target_elf_prstatus *, const TaskState *, int); 2837 static int fill_psinfo(struct target_elf_prpsinfo *, const TaskState *); 2838 static void fill_auxv_note(struct memelfnote *, const TaskState *); 2839 static void fill_elf_note_phdr(struct elf_phdr *, int, off_t); 2840 static size_t note_size(const struct memelfnote *); 2841 static void free_note_info(struct elf_note_info *); 2842 static int fill_note_info(struct elf_note_info *, long, const CPUArchState *); 2843 static void fill_thread_info(struct elf_note_info *, const CPUArchState *); 2844 static int core_dump_filename(const TaskState *, char *, size_t); 2845 2846 static int dump_write(int, const void *, size_t); 2847 static int write_note(struct memelfnote *, int); 2848 static int write_note_info(struct elf_note_info *, int); 2849 2850 #ifdef BSWAP_NEEDED 2851 static void bswap_prstatus(struct target_elf_prstatus *prstatus) 2852 { 2853 prstatus->pr_info.si_signo = tswap32(prstatus->pr_info.si_signo); 2854 prstatus->pr_info.si_code = tswap32(prstatus->pr_info.si_code); 2855 prstatus->pr_info.si_errno = tswap32(prstatus->pr_info.si_errno); 2856 prstatus->pr_cursig = tswap16(prstatus->pr_cursig); 2857 prstatus->pr_sigpend = tswapal(prstatus->pr_sigpend); 2858 prstatus->pr_sighold = tswapal(prstatus->pr_sighold); 2859 prstatus->pr_pid = tswap32(prstatus->pr_pid); 2860 prstatus->pr_ppid = tswap32(prstatus->pr_ppid); 2861 prstatus->pr_pgrp = tswap32(prstatus->pr_pgrp); 2862 prstatus->pr_sid = tswap32(prstatus->pr_sid); 2863 /* cpu times are not filled, so we skip them */ 2864 /* regs should be in correct format already */ 2865 prstatus->pr_fpvalid = tswap32(prstatus->pr_fpvalid); 2866 } 2867 2868 static void bswap_psinfo(struct target_elf_prpsinfo *psinfo) 2869 { 2870 psinfo->pr_flag = tswapal(psinfo->pr_flag); 2871 psinfo->pr_uid = tswap16(psinfo->pr_uid); 2872 psinfo->pr_gid = tswap16(psinfo->pr_gid); 2873 psinfo->pr_pid = tswap32(psinfo->pr_pid); 2874 psinfo->pr_ppid = tswap32(psinfo->pr_ppid); 2875 psinfo->pr_pgrp = tswap32(psinfo->pr_pgrp); 2876 psinfo->pr_sid = tswap32(psinfo->pr_sid); 2877 } 2878 2879 static void bswap_note(struct elf_note *en) 2880 { 2881 bswap32s(&en->n_namesz); 2882 bswap32s(&en->n_descsz); 2883 bswap32s(&en->n_type); 2884 } 2885 #else 2886 static inline void bswap_prstatus(struct target_elf_prstatus *p) { } 2887 static inline void bswap_psinfo(struct target_elf_prpsinfo *p) {} 2888 static inline void bswap_note(struct elf_note *en) { } 2889 #endif /* BSWAP_NEEDED */ 2890 2891 /* 2892 * Minimal support for linux memory regions. These are needed 2893 * when we are finding out what memory exactly belongs to 2894 * emulated process. No locks needed here, as long as 2895 * thread that received the signal is stopped. 2896 */ 2897 2898 static struct mm_struct *vma_init(void) 2899 { 2900 struct mm_struct *mm; 2901 2902 if ((mm = g_malloc(sizeof (*mm))) == NULL) 2903 return (NULL); 2904 2905 mm->mm_count = 0; 2906 QTAILQ_INIT(&mm->mm_mmap); 2907 2908 return (mm); 2909 } 2910 2911 static void vma_delete(struct mm_struct *mm) 2912 { 2913 struct vm_area_struct *vma; 2914 2915 while ((vma = vma_first(mm)) != NULL) { 2916 QTAILQ_REMOVE(&mm->mm_mmap, vma, vma_link); 2917 g_free(vma); 2918 } 2919 g_free(mm); 2920 } 2921 2922 static int vma_add_mapping(struct mm_struct *mm, target_ulong start, 2923 target_ulong end, abi_ulong flags) 2924 { 2925 struct vm_area_struct *vma; 2926 2927 if ((vma = g_malloc0(sizeof (*vma))) == NULL) 2928 return (-1); 2929 2930 vma->vma_start = start; 2931 vma->vma_end = end; 2932 vma->vma_flags = flags; 2933 2934 QTAILQ_INSERT_TAIL(&mm->mm_mmap, vma, vma_link); 2935 mm->mm_count++; 2936 2937 return (0); 2938 } 2939 2940 static struct vm_area_struct *vma_first(const struct mm_struct *mm) 2941 { 2942 return (QTAILQ_FIRST(&mm->mm_mmap)); 2943 } 2944 2945 static struct vm_area_struct *vma_next(struct vm_area_struct *vma) 2946 { 2947 return (QTAILQ_NEXT(vma, vma_link)); 2948 } 2949 2950 static int vma_get_mapping_count(const struct mm_struct *mm) 2951 { 2952 return (mm->mm_count); 2953 } 2954 2955 /* 2956 * Calculate file (dump) size of given memory region. 2957 */ 2958 static abi_ulong vma_dump_size(const struct vm_area_struct *vma) 2959 { 2960 /* if we cannot even read the first page, skip it */ 2961 if (!access_ok(VERIFY_READ, vma->vma_start, TARGET_PAGE_SIZE)) 2962 return (0); 2963 2964 /* 2965 * Usually we don't dump executable pages as they contain 2966 * non-writable code that debugger can read directly from 2967 * target library etc. However, thread stacks are marked 2968 * also executable so we read in first page of given region 2969 * and check whether it contains elf header. If there is 2970 * no elf header, we dump it. 2971 */ 2972 if (vma->vma_flags & PROT_EXEC) { 2973 char page[TARGET_PAGE_SIZE]; 2974 2975 copy_from_user(page, vma->vma_start, sizeof (page)); 2976 if ((page[EI_MAG0] == ELFMAG0) && 2977 (page[EI_MAG1] == ELFMAG1) && 2978 (page[EI_MAG2] == ELFMAG2) && 2979 (page[EI_MAG3] == ELFMAG3)) { 2980 /* 2981 * Mappings are possibly from ELF binary. Don't dump 2982 * them. 2983 */ 2984 return (0); 2985 } 2986 } 2987 2988 return (vma->vma_end - vma->vma_start); 2989 } 2990 2991 static int vma_walker(void *priv, target_ulong start, target_ulong end, 2992 unsigned long flags) 2993 { 2994 struct mm_struct *mm = (struct mm_struct *)priv; 2995 2996 vma_add_mapping(mm, start, end, flags); 2997 return (0); 2998 } 2999 3000 static void fill_note(struct memelfnote *note, const char *name, int type, 3001 unsigned int sz, void *data) 3002 { 3003 unsigned int namesz; 3004 3005 namesz = strlen(name) + 1; 3006 note->name = name; 3007 note->namesz = namesz; 3008 note->namesz_rounded = roundup(namesz, sizeof (int32_t)); 3009 note->type = type; 3010 note->datasz = sz; 3011 note->datasz_rounded = roundup(sz, sizeof (int32_t)); 3012 3013 note->data = data; 3014 3015 /* 3016 * We calculate rounded up note size here as specified by 3017 * ELF document. 3018 */ 3019 note->notesz = sizeof (struct elf_note) + 3020 note->namesz_rounded + note->datasz_rounded; 3021 } 3022 3023 static void fill_elf_header(struct elfhdr *elf, int segs, uint16_t machine, 3024 uint32_t flags) 3025 { 3026 (void) memset(elf, 0, sizeof(*elf)); 3027 3028 (void) memcpy(elf->e_ident, ELFMAG, SELFMAG); 3029 elf->e_ident[EI_CLASS] = ELF_CLASS; 3030 elf->e_ident[EI_DATA] = ELF_DATA; 3031 elf->e_ident[EI_VERSION] = EV_CURRENT; 3032 elf->e_ident[EI_OSABI] = ELF_OSABI; 3033 3034 elf->e_type = ET_CORE; 3035 elf->e_machine = machine; 3036 elf->e_version = EV_CURRENT; 3037 elf->e_phoff = sizeof(struct elfhdr); 3038 elf->e_flags = flags; 3039 elf->e_ehsize = sizeof(struct elfhdr); 3040 elf->e_phentsize = sizeof(struct elf_phdr); 3041 elf->e_phnum = segs; 3042 3043 bswap_ehdr(elf); 3044 } 3045 3046 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset) 3047 { 3048 phdr->p_type = PT_NOTE; 3049 phdr->p_offset = offset; 3050 phdr->p_vaddr = 0; 3051 phdr->p_paddr = 0; 3052 phdr->p_filesz = sz; 3053 phdr->p_memsz = 0; 3054 phdr->p_flags = 0; 3055 phdr->p_align = 0; 3056 3057 bswap_phdr(phdr, 1); 3058 } 3059 3060 static size_t note_size(const struct memelfnote *note) 3061 { 3062 return (note->notesz); 3063 } 3064 3065 static void fill_prstatus(struct target_elf_prstatus *prstatus, 3066 const TaskState *ts, int signr) 3067 { 3068 (void) memset(prstatus, 0, sizeof (*prstatus)); 3069 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; 3070 prstatus->pr_pid = ts->ts_tid; 3071 prstatus->pr_ppid = getppid(); 3072 prstatus->pr_pgrp = getpgrp(); 3073 prstatus->pr_sid = getsid(0); 3074 3075 bswap_prstatus(prstatus); 3076 } 3077 3078 static int fill_psinfo(struct target_elf_prpsinfo *psinfo, const TaskState *ts) 3079 { 3080 char *base_filename; 3081 unsigned int i, len; 3082 3083 (void) memset(psinfo, 0, sizeof (*psinfo)); 3084 3085 len = ts->info->arg_end - ts->info->arg_start; 3086 if (len >= ELF_PRARGSZ) 3087 len = ELF_PRARGSZ - 1; 3088 if (copy_from_user(&psinfo->pr_psargs, ts->info->arg_start, len)) 3089 return -EFAULT; 3090 for (i = 0; i < len; i++) 3091 if (psinfo->pr_psargs[i] == 0) 3092 psinfo->pr_psargs[i] = ' '; 3093 psinfo->pr_psargs[len] = 0; 3094 3095 psinfo->pr_pid = getpid(); 3096 psinfo->pr_ppid = getppid(); 3097 psinfo->pr_pgrp = getpgrp(); 3098 psinfo->pr_sid = getsid(0); 3099 psinfo->pr_uid = getuid(); 3100 psinfo->pr_gid = getgid(); 3101 3102 base_filename = g_path_get_basename(ts->bprm->filename); 3103 /* 3104 * Using strncpy here is fine: at max-length, 3105 * this field is not NUL-terminated. 3106 */ 3107 (void) strncpy(psinfo->pr_fname, base_filename, 3108 sizeof(psinfo->pr_fname)); 3109 3110 g_free(base_filename); 3111 bswap_psinfo(psinfo); 3112 return (0); 3113 } 3114 3115 static void fill_auxv_note(struct memelfnote *note, const TaskState *ts) 3116 { 3117 elf_addr_t auxv = (elf_addr_t)ts->info->saved_auxv; 3118 elf_addr_t orig_auxv = auxv; 3119 void *ptr; 3120 int len = ts->info->auxv_len; 3121 3122 /* 3123 * Auxiliary vector is stored in target process stack. It contains 3124 * {type, value} pairs that we need to dump into note. This is not 3125 * strictly necessary but we do it here for sake of completeness. 3126 */ 3127 3128 /* read in whole auxv vector and copy it to memelfnote */ 3129 ptr = lock_user(VERIFY_READ, orig_auxv, len, 0); 3130 if (ptr != NULL) { 3131 fill_note(note, "CORE", NT_AUXV, len, ptr); 3132 unlock_user(ptr, auxv, len); 3133 } 3134 } 3135 3136 /* 3137 * Constructs name of coredump file. We have following convention 3138 * for the name: 3139 * qemu_<basename-of-target-binary>_<date>-<time>_<pid>.core 3140 * 3141 * Returns 0 in case of success, -1 otherwise (errno is set). 3142 */ 3143 static int core_dump_filename(const TaskState *ts, char *buf, 3144 size_t bufsize) 3145 { 3146 char timestamp[64]; 3147 char *base_filename = NULL; 3148 struct timeval tv; 3149 struct tm tm; 3150 3151 assert(bufsize >= PATH_MAX); 3152 3153 if (gettimeofday(&tv, NULL) < 0) { 3154 (void) fprintf(stderr, "unable to get current timestamp: %s", 3155 strerror(errno)); 3156 return (-1); 3157 } 3158 3159 base_filename = g_path_get_basename(ts->bprm->filename); 3160 (void) strftime(timestamp, sizeof (timestamp), "%Y%m%d-%H%M%S", 3161 localtime_r(&tv.tv_sec, &tm)); 3162 (void) snprintf(buf, bufsize, "qemu_%s_%s_%d.core", 3163 base_filename, timestamp, (int)getpid()); 3164 g_free(base_filename); 3165 3166 return (0); 3167 } 3168 3169 static int dump_write(int fd, const void *ptr, size_t size) 3170 { 3171 const char *bufp = (const char *)ptr; 3172 ssize_t bytes_written, bytes_left; 3173 struct rlimit dumpsize; 3174 off_t pos; 3175 3176 bytes_written = 0; 3177 getrlimit(RLIMIT_CORE, &dumpsize); 3178 if ((pos = lseek(fd, 0, SEEK_CUR))==-1) { 3179 if (errno == ESPIPE) { /* not a seekable stream */ 3180 bytes_left = size; 3181 } else { 3182 return pos; 3183 } 3184 } else { 3185 if (dumpsize.rlim_cur <= pos) { 3186 return -1; 3187 } else if (dumpsize.rlim_cur == RLIM_INFINITY) { 3188 bytes_left = size; 3189 } else { 3190 size_t limit_left=dumpsize.rlim_cur - pos; 3191 bytes_left = limit_left >= size ? size : limit_left ; 3192 } 3193 } 3194 3195 /* 3196 * In normal conditions, single write(2) should do but 3197 * in case of socket etc. this mechanism is more portable. 3198 */ 3199 do { 3200 bytes_written = write(fd, bufp, bytes_left); 3201 if (bytes_written < 0) { 3202 if (errno == EINTR) 3203 continue; 3204 return (-1); 3205 } else if (bytes_written == 0) { /* eof */ 3206 return (-1); 3207 } 3208 bufp += bytes_written; 3209 bytes_left -= bytes_written; 3210 } while (bytes_left > 0); 3211 3212 return (0); 3213 } 3214 3215 static int write_note(struct memelfnote *men, int fd) 3216 { 3217 struct elf_note en; 3218 3219 en.n_namesz = men->namesz; 3220 en.n_type = men->type; 3221 en.n_descsz = men->datasz; 3222 3223 bswap_note(&en); 3224 3225 if (dump_write(fd, &en, sizeof(en)) != 0) 3226 return (-1); 3227 if (dump_write(fd, men->name, men->namesz_rounded) != 0) 3228 return (-1); 3229 if (dump_write(fd, men->data, men->datasz_rounded) != 0) 3230 return (-1); 3231 3232 return (0); 3233 } 3234 3235 static void fill_thread_info(struct elf_note_info *info, const CPUArchState *env) 3236 { 3237 CPUState *cpu = ENV_GET_CPU((CPUArchState *)env); 3238 TaskState *ts = (TaskState *)cpu->opaque; 3239 struct elf_thread_status *ets; 3240 3241 ets = g_malloc0(sizeof (*ets)); 3242 ets->num_notes = 1; /* only prstatus is dumped */ 3243 fill_prstatus(&ets->prstatus, ts, 0); 3244 elf_core_copy_regs(&ets->prstatus.pr_reg, env); 3245 fill_note(&ets->notes[0], "CORE", NT_PRSTATUS, sizeof (ets->prstatus), 3246 &ets->prstatus); 3247 3248 QTAILQ_INSERT_TAIL(&info->thread_list, ets, ets_link); 3249 3250 info->notes_size += note_size(&ets->notes[0]); 3251 } 3252 3253 static void init_note_info(struct elf_note_info *info) 3254 { 3255 /* Initialize the elf_note_info structure so that it is at 3256 * least safe to call free_note_info() on it. Must be 3257 * called before calling fill_note_info(). 3258 */ 3259 memset(info, 0, sizeof (*info)); 3260 QTAILQ_INIT(&info->thread_list); 3261 } 3262 3263 static int fill_note_info(struct elf_note_info *info, 3264 long signr, const CPUArchState *env) 3265 { 3266 #define NUMNOTES 3 3267 CPUState *cpu = ENV_GET_CPU((CPUArchState *)env); 3268 TaskState *ts = (TaskState *)cpu->opaque; 3269 int i; 3270 3271 info->notes = g_new0(struct memelfnote, NUMNOTES); 3272 if (info->notes == NULL) 3273 return (-ENOMEM); 3274 info->prstatus = g_malloc0(sizeof (*info->prstatus)); 3275 if (info->prstatus == NULL) 3276 return (-ENOMEM); 3277 info->psinfo = g_malloc0(sizeof (*info->psinfo)); 3278 if (info->prstatus == NULL) 3279 return (-ENOMEM); 3280 3281 /* 3282 * First fill in status (and registers) of current thread 3283 * including process info & aux vector. 3284 */ 3285 fill_prstatus(info->prstatus, ts, signr); 3286 elf_core_copy_regs(&info->prstatus->pr_reg, env); 3287 fill_note(&info->notes[0], "CORE", NT_PRSTATUS, 3288 sizeof (*info->prstatus), info->prstatus); 3289 fill_psinfo(info->psinfo, ts); 3290 fill_note(&info->notes[1], "CORE", NT_PRPSINFO, 3291 sizeof (*info->psinfo), info->psinfo); 3292 fill_auxv_note(&info->notes[2], ts); 3293 info->numnote = 3; 3294 3295 info->notes_size = 0; 3296 for (i = 0; i < info->numnote; i++) 3297 info->notes_size += note_size(&info->notes[i]); 3298 3299 /* read and fill status of all threads */ 3300 cpu_list_lock(); 3301 CPU_FOREACH(cpu) { 3302 if (cpu == thread_cpu) { 3303 continue; 3304 } 3305 fill_thread_info(info, (CPUArchState *)cpu->env_ptr); 3306 } 3307 cpu_list_unlock(); 3308 3309 return (0); 3310 } 3311 3312 static void free_note_info(struct elf_note_info *info) 3313 { 3314 struct elf_thread_status *ets; 3315 3316 while (!QTAILQ_EMPTY(&info->thread_list)) { 3317 ets = QTAILQ_FIRST(&info->thread_list); 3318 QTAILQ_REMOVE(&info->thread_list, ets, ets_link); 3319 g_free(ets); 3320 } 3321 3322 g_free(info->prstatus); 3323 g_free(info->psinfo); 3324 g_free(info->notes); 3325 } 3326 3327 static int write_note_info(struct elf_note_info *info, int fd) 3328 { 3329 struct elf_thread_status *ets; 3330 int i, error = 0; 3331 3332 /* write prstatus, psinfo and auxv for current thread */ 3333 for (i = 0; i < info->numnote; i++) 3334 if ((error = write_note(&info->notes[i], fd)) != 0) 3335 return (error); 3336 3337 /* write prstatus for each thread */ 3338 QTAILQ_FOREACH(ets, &info->thread_list, ets_link) { 3339 if ((error = write_note(&ets->notes[0], fd)) != 0) 3340 return (error); 3341 } 3342 3343 return (0); 3344 } 3345 3346 /* 3347 * Write out ELF coredump. 3348 * 3349 * See documentation of ELF object file format in: 3350 * http://www.caldera.com/developers/devspecs/gabi41.pdf 3351 * 3352 * Coredump format in linux is following: 3353 * 3354 * 0 +----------------------+ \ 3355 * | ELF header | ET_CORE | 3356 * +----------------------+ | 3357 * | ELF program headers | |--- headers 3358 * | - NOTE section | | 3359 * | - PT_LOAD sections | | 3360 * +----------------------+ / 3361 * | NOTEs: | 3362 * | - NT_PRSTATUS | 3363 * | - NT_PRSINFO | 3364 * | - NT_AUXV | 3365 * +----------------------+ <-- aligned to target page 3366 * | Process memory dump | 3367 * : : 3368 * . . 3369 * : : 3370 * | | 3371 * +----------------------+ 3372 * 3373 * NT_PRSTATUS -> struct elf_prstatus (per thread) 3374 * NT_PRSINFO -> struct elf_prpsinfo 3375 * NT_AUXV is array of { type, value } pairs (see fill_auxv_note()). 3376 * 3377 * Format follows System V format as close as possible. Current 3378 * version limitations are as follows: 3379 * - no floating point registers are dumped 3380 * 3381 * Function returns 0 in case of success, negative errno otherwise. 3382 * 3383 * TODO: make this work also during runtime: it should be 3384 * possible to force coredump from running process and then 3385 * continue processing. For example qemu could set up SIGUSR2 3386 * handler (provided that target process haven't registered 3387 * handler for that) that does the dump when signal is received. 3388 */ 3389 static int elf_core_dump(int signr, const CPUArchState *env) 3390 { 3391 const CPUState *cpu = ENV_GET_CPU((CPUArchState *)env); 3392 const TaskState *ts = (const TaskState *)cpu->opaque; 3393 struct vm_area_struct *vma = NULL; 3394 char corefile[PATH_MAX]; 3395 struct elf_note_info info; 3396 struct elfhdr elf; 3397 struct elf_phdr phdr; 3398 struct rlimit dumpsize; 3399 struct mm_struct *mm = NULL; 3400 off_t offset = 0, data_offset = 0; 3401 int segs = 0; 3402 int fd = -1; 3403 3404 init_note_info(&info); 3405 3406 errno = 0; 3407 getrlimit(RLIMIT_CORE, &dumpsize); 3408 if (dumpsize.rlim_cur == 0) 3409 return 0; 3410 3411 if (core_dump_filename(ts, corefile, sizeof (corefile)) < 0) 3412 return (-errno); 3413 3414 if ((fd = open(corefile, O_WRONLY | O_CREAT, 3415 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0) 3416 return (-errno); 3417 3418 /* 3419 * Walk through target process memory mappings and 3420 * set up structure containing this information. After 3421 * this point vma_xxx functions can be used. 3422 */ 3423 if ((mm = vma_init()) == NULL) 3424 goto out; 3425 3426 walk_memory_regions(mm, vma_walker); 3427 segs = vma_get_mapping_count(mm); 3428 3429 /* 3430 * Construct valid coredump ELF header. We also 3431 * add one more segment for notes. 3432 */ 3433 fill_elf_header(&elf, segs + 1, ELF_MACHINE, 0); 3434 if (dump_write(fd, &elf, sizeof (elf)) != 0) 3435 goto out; 3436 3437 /* fill in the in-memory version of notes */ 3438 if (fill_note_info(&info, signr, env) < 0) 3439 goto out; 3440 3441 offset += sizeof (elf); /* elf header */ 3442 offset += (segs + 1) * sizeof (struct elf_phdr); /* program headers */ 3443 3444 /* write out notes program header */ 3445 fill_elf_note_phdr(&phdr, info.notes_size, offset); 3446 3447 offset += info.notes_size; 3448 if (dump_write(fd, &phdr, sizeof (phdr)) != 0) 3449 goto out; 3450 3451 /* 3452 * ELF specification wants data to start at page boundary so 3453 * we align it here. 3454 */ 3455 data_offset = offset = roundup(offset, ELF_EXEC_PAGESIZE); 3456 3457 /* 3458 * Write program headers for memory regions mapped in 3459 * the target process. 3460 */ 3461 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) { 3462 (void) memset(&phdr, 0, sizeof (phdr)); 3463 3464 phdr.p_type = PT_LOAD; 3465 phdr.p_offset = offset; 3466 phdr.p_vaddr = vma->vma_start; 3467 phdr.p_paddr = 0; 3468 phdr.p_filesz = vma_dump_size(vma); 3469 offset += phdr.p_filesz; 3470 phdr.p_memsz = vma->vma_end - vma->vma_start; 3471 phdr.p_flags = vma->vma_flags & PROT_READ ? PF_R : 0; 3472 if (vma->vma_flags & PROT_WRITE) 3473 phdr.p_flags |= PF_W; 3474 if (vma->vma_flags & PROT_EXEC) 3475 phdr.p_flags |= PF_X; 3476 phdr.p_align = ELF_EXEC_PAGESIZE; 3477 3478 bswap_phdr(&phdr, 1); 3479 if (dump_write(fd, &phdr, sizeof(phdr)) != 0) { 3480 goto out; 3481 } 3482 } 3483 3484 /* 3485 * Next we write notes just after program headers. No 3486 * alignment needed here. 3487 */ 3488 if (write_note_info(&info, fd) < 0) 3489 goto out; 3490 3491 /* align data to page boundary */ 3492 if (lseek(fd, data_offset, SEEK_SET) != data_offset) 3493 goto out; 3494 3495 /* 3496 * Finally we can dump process memory into corefile as well. 3497 */ 3498 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) { 3499 abi_ulong addr; 3500 abi_ulong end; 3501 3502 end = vma->vma_start + vma_dump_size(vma); 3503 3504 for (addr = vma->vma_start; addr < end; 3505 addr += TARGET_PAGE_SIZE) { 3506 char page[TARGET_PAGE_SIZE]; 3507 int error; 3508 3509 /* 3510 * Read in page from target process memory and 3511 * write it to coredump file. 3512 */ 3513 error = copy_from_user(page, addr, sizeof (page)); 3514 if (error != 0) { 3515 (void) fprintf(stderr, "unable to dump " TARGET_ABI_FMT_lx "\n", 3516 addr); 3517 errno = -error; 3518 goto out; 3519 } 3520 if (dump_write(fd, page, TARGET_PAGE_SIZE) < 0) 3521 goto out; 3522 } 3523 } 3524 3525 out: 3526 free_note_info(&info); 3527 if (mm != NULL) 3528 vma_delete(mm); 3529 (void) close(fd); 3530 3531 if (errno != 0) 3532 return (-errno); 3533 return (0); 3534 } 3535 #endif /* USE_ELF_CORE_DUMP */ 3536 3537 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop) 3538 { 3539 init_thread(regs, infop); 3540 } 3541