disas.c

   1 /* General "disassemble this chunk" code.  Used for debugging. */
   2 #include "config.h"
   3 #include "disas/bfd.h"
   4 #include "elf.h"
   5 #include <errno.h>
   6
   7 #include "cpu.h"
   8 #include "disas/disas.h"
   9
  10 typedef struct CPUDebug {
  11     struct disassemble_info info;
  12     CPUArchState *env;
  13 } CPUDebug;
  14
  15 /* Filled in by elfload.c.  Simplistic, but will do for now. */
  16 struct syminfo *syminfos = NULL;
  17
  18 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  19    Transfer them to myaddr.  */
  20 int
  21 buffer_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
  22                    struct disassemble_info *info)
  23 {
  24     if (memaddr < info->buffer_vma
  25         || memaddr + length > info->buffer_vma + info->buffer_length)
  26         /* Out of bounds.  Use EIO because GDB uses it.  */
  27         return EIO;
  28     memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
  29     return 0;
  30 }
  31
  32 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  33    Transfer them to myaddr.  */
  34 static int
  35 target_read_memory (bfd_vma memaddr,
  36                     bfd_byte *myaddr,
  37                     int length,
  38                     struct disassemble_info *info)
  39 {
  40     CPUDebug *s = container_of(info, CPUDebug, info);
  41
  42     cpu_memory_rw_debug(ENV_GET_CPU(s->env), memaddr, myaddr, length, 0);
  43     return 0;
  44 }
  45
  46 /* Print an error message.  We can assume that this is in response to
  47    an error return from buffer_read_memory.  */
  48 void
  49 perror_memory (int status, bfd_vma memaddr, struct disassemble_info *info)
  50 {
  51   if (status != EIO)
  52     /* Can't happen.  */
  53     (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
  54   else
  55     /* Actually, address between memaddr and memaddr + len was
  56        out of bounds.  */
  57     (*info->fprintf_func) (info->stream,
  58                            "Address 0x%" PRIx64 " is out of bounds.\n", memaddr);
  59 }
  60
  61 /* This could be in a separate file, to save minuscule amounts of space
  62    in statically linked executables.  */
  63
  64 /* Just print the address is hex.  This is included for completeness even
  65    though both GDB and objdump provide their own (to print symbolic
  66    addresses).  */
  67
  68 void
  69 generic_print_address (bfd_vma addr, struct disassemble_info *info)
  70 {
  71     (*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);
  72 }
  73
  74 /* Print address in hex, truncated to the width of a target virtual address. */
  75 static void
  76 generic_print_target_address(bfd_vma addr, struct disassemble_info *info)
  77 {
  78     uint64_t mask = ~0ULL >> (64 - TARGET_VIRT_ADDR_SPACE_BITS);
  79     generic_print_address(addr & mask, info);
  80 }
  81
  82 /* Print address in hex, truncated to the width of a host virtual address. */
  83 static void
  84 generic_print_host_address(bfd_vma addr, struct disassemble_info *info)
  85 {
  86     uint64_t mask = ~0ULL >> (64 - (sizeof(void *) * 8));
  87     generic_print_address(addr & mask, info);
  88 }
  89
  90 /* Just return the given address.  */
  91
  92 int
  93 generic_symbol_at_address (bfd_vma addr, struct disassemble_info *info)
  94 {
  95   return 1;
  96 }
  97
  98 bfd_vma bfd_getl64 (const bfd_byte *addr)
  99 {
 100   unsigned long long v;
 101
 102   v = (unsigned long long) addr[0];
 103   v |= (unsigned long long) addr[1] << 8;
 104   v |= (unsigned long long) addr[2] << 16;
 105   v |= (unsigned long long) addr[3] << 24;
 106   v |= (unsigned long long) addr[4] << 32;
 107   v |= (unsigned long long) addr[5] << 40;
 108   v |= (unsigned long long) addr[6] << 48;
 109   v |= (unsigned long long) addr[7] << 56;
 110   return (bfd_vma) v;
 111 }
 112
 113 bfd_vma bfd_getl32 (const bfd_byte *addr)
 114 {
 115   unsigned long v;
 116
 117   v = (unsigned long) addr[0];
 118   v |= (unsigned long) addr[1] << 8;
 119   v |= (unsigned long) addr[2] << 16;
 120   v |= (unsigned long) addr[3] << 24;
 121   return (bfd_vma) v;
 122 }
 123
 124 bfd_vma bfd_getb32 (const bfd_byte *addr)
 125 {
 126   unsigned long v;
 127
 128   v = (unsigned long) addr[0] << 24;
 129   v |= (unsigned long) addr[1] << 16;
 130   v |= (unsigned long) addr[2] << 8;
 131   v |= (unsigned long) addr[3];
 132   return (bfd_vma) v;
 133 }
 134
 135 bfd_vma bfd_getl16 (const bfd_byte *addr)
 136 {
 137   unsigned long v;
 138
 139   v = (unsigned long) addr[0];
 140   v |= (unsigned long) addr[1] << 8;
 141   return (bfd_vma) v;
 142 }
 143
 144 bfd_vma bfd_getb16 (const bfd_byte *addr)
 145 {
 146   unsigned long v;
 147
 148   v = (unsigned long) addr[0] << 24;
 149   v |= (unsigned long) addr[1] << 16;
 150   return (bfd_vma) v;
 151 }
 152
 153 #ifdef TARGET_ARM
 154 static int
 155 print_insn_thumb1(bfd_vma pc, disassemble_info *info)
 156 {
 157   return print_insn_arm(pc | 1, info);
 158 }
 159 #endif
 160
 161 static int print_insn_objdump(bfd_vma pc, disassemble_info *info,
 162                               const char *prefix)
 163 {
 164     int i, n = info->buffer_length;
 165     uint8_t *buf = g_malloc(n);
 166
 167     info->read_memory_func(pc, buf, n, info);
 168
 169     for (i = 0; i < n; ++i) {
 170         if (i % 32 == 0) {
 171             info->fprintf_func(info->stream, "\n%s: ", prefix);
 172         }
 173         info->fprintf_func(info->stream, "%02x", buf[i]);
 174     }
 175
 176     g_free(buf);
 177     return n;
 178 }
 179
 180 static int print_insn_od_host(bfd_vma pc, disassemble_info *info)
 181 {
 182     return print_insn_objdump(pc, info, "OBJD-H");
 183 }
 184
 185 static int print_insn_od_target(bfd_vma pc, disassemble_info *info)
 186 {
 187     return print_insn_objdump(pc, info, "OBJD-T");
 188 }
 189
 190 /* Disassemble this for me please... (debugging). 'flags' has the following
 191    values:
 192     i386 - 1 means 16 bit code, 2 means 64 bit code
 193     arm  - bit 0 = thumb, bit 1 = reverse endian, bit 2 = A64
 194     ppc  - nonzero means little endian
 195     other targets - unused
 196  */
 197 void target_disas(FILE *out, CPUArchState *env, target_ulong code,
 198                   target_ulong size, int flags)
 199 {
 200     target_ulong pc;
 201     int count;
 202     CPUDebug s;
 203     int (*print_insn)(bfd_vma pc, disassemble_info *info) = NULL;
 204
 205     INIT_DISASSEMBLE_INFO(s.info, out, fprintf);
 206
 207     s.env = env;
 208     s.info.read_memory_func = target_read_memory;
 209     s.info.buffer_vma = code;
 210     s.info.buffer_length = size;
 211     s.info.print_address_func = generic_print_target_address;
 212
 213 #ifdef TARGET_WORDS_BIGENDIAN
 214     s.info.endian = BFD_ENDIAN_BIG;
 215 #else
 216     s.info.endian = BFD_ENDIAN_LITTLE;
 217 #endif
 218 #if defined(TARGET_I386)
 219     if (flags == 2) {
 220         s.info.mach = bfd_mach_x86_64;
 221     } else if (flags == 1) {
 222         s.info.mach = bfd_mach_i386_i8086;
 223     } else {
 224         s.info.mach = bfd_mach_i386_i386;
 225     }
 226     print_insn = print_insn_i386;
 227 #elif defined(TARGET_ARM)
 228     if (flags & 4) {
 229         /* We might not be compiled with the A64 disassembler
 230          * because it needs a C++ compiler; in that case we will
 231          * fall through to the default print_insn_od case.
 232          */
 233 #if defined(CONFIG_ARM_A64_DIS)
 234         print_insn = print_insn_arm_a64;
 235 #endif
 236     } else if (flags & 1) {
 237         print_insn = print_insn_thumb1;
 238     } else {
 239         print_insn = print_insn_arm;
 240     }
 241     if (flags & 2) {
 242 #ifdef TARGET_WORDS_BIGENDIAN
 243         s.info.endian = BFD_ENDIAN_LITTLE;
 244 #else
 245         s.info.endian = BFD_ENDIAN_BIG;
 246 #endif
 247     }
 248 #elif defined(TARGET_SPARC)
 249     print_insn = print_insn_sparc;
 250 #ifdef TARGET_SPARC64
 251     s.info.mach = bfd_mach_sparc_v9b;
 252 #endif
 253 #elif defined(TARGET_PPC)
 254     if (flags >> 16) {
 255         s.info.endian = BFD_ENDIAN_LITTLE;
 256     }
 257     if (flags & 0xFFFF) {
 258         /* If we have a precise definitions of the instructions set, use it */
 259         s.info.mach = flags & 0xFFFF;
 260     } else {
 261 #ifdef TARGET_PPC64
 262         s.info.mach = bfd_mach_ppc64;
 263 #else
 264         s.info.mach = bfd_mach_ppc;
 265 #endif
 266     }
 267     s.info.disassembler_options = (char *)"any";
 268     print_insn = print_insn_ppc;
 269 #elif defined(TARGET_M68K)
 270     print_insn = print_insn_m68k;
 271 #elif defined(TARGET_MIPS)
 272 #ifdef TARGET_WORDS_BIGENDIAN
 273     print_insn = print_insn_big_mips;
 274 #else
 275     print_insn = print_insn_little_mips;
 276 #endif
 277 #elif defined(TARGET_SH4)
 278     s.info.mach = bfd_mach_sh4;
 279     print_insn = print_insn_sh;
 280 #elif defined(TARGET_ALPHA)
 281     s.info.mach = bfd_mach_alpha_ev6;
 282     print_insn = print_insn_alpha;
 283 #elif defined(TARGET_CRIS)
 284     if (flags != 32) {
 285         s.info.mach = bfd_mach_cris_v0_v10;
 286         print_insn = print_insn_crisv10;
 287     } else {
 288         s.info.mach = bfd_mach_cris_v32;
 289         print_insn = print_insn_crisv32;
 290     }
 291 #elif defined(TARGET_S390X)
 292     s.info.mach = bfd_mach_s390_64;
 293     print_insn = print_insn_s390;
 294 #elif defined(TARGET_MICROBLAZE)
 295     s.info.mach = bfd_arch_microblaze;
 296     print_insn = print_insn_microblaze;
 297 #elif defined(TARGET_MOXIE)
 298     s.info.mach = bfd_arch_moxie;
 299     print_insn = print_insn_moxie;
 300 #elif defined(TARGET_LM32)
 301     s.info.mach = bfd_mach_lm32;
 302     print_insn = print_insn_lm32;
 303 #endif
 304     if (print_insn == NULL) {
 305         print_insn = print_insn_od_target;
 306     }
 307
 308     for (pc = code; size > 0; pc += count, size -= count) {
 309         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 310         count = print_insn(pc, &s.info);
 311 #if 0
 312         {
 313             int i;
 314             uint8_t b;
 315             fprintf(out, " {");
 316             for(i = 0; i < count; i++) {
 317                 target_read_memory(pc + i, &b, 1, &s.info);
 318                 fprintf(out, " %02x", b);
 319             }
 320             fprintf(out, " }");
 321         }
 322 #endif
 323         fprintf(out, "\n");
 324         if (count < 0)
 325             break;
 326         if (size < count) {
 327             fprintf(out,
 328                     "Disassembler disagrees with translator over instruction "
 329                     "decoding\n"
 330                     "Please report this to qemu-devel@nongnu.org\n");
 331             break;
 332         }
 333     }
 334 }
 335
 336 /* Disassemble this for me please... (debugging). */
 337 void disas(FILE *out, void *code, unsigned long size)
 338 {
 339     uintptr_t pc;
 340     int count;
 341     CPUDebug s;
 342     int (*print_insn)(bfd_vma pc, disassemble_info *info) = NULL;
 343
 344     INIT_DISASSEMBLE_INFO(s.info, out, fprintf);
 345     s.info.print_address_func = generic_print_host_address;
 346
 347     s.info.buffer = code;
 348     s.info.buffer_vma = (uintptr_t)code;
 349     s.info.buffer_length = size;
 350
 351 #ifdef HOST_WORDS_BIGENDIAN
 352     s.info.endian = BFD_ENDIAN_BIG;
 353 #else
 354     s.info.endian = BFD_ENDIAN_LITTLE;
 355 #endif
 356 #if defined(CONFIG_TCG_INTERPRETER)
 357     print_insn = print_insn_tci;
 358 #elif defined(__i386__)
 359     s.info.mach = bfd_mach_i386_i386;
 360     print_insn = print_insn_i386;
 361 #elif defined(__x86_64__)
 362     s.info.mach = bfd_mach_x86_64;
 363     print_insn = print_insn_i386;
 364 #elif defined(_ARCH_PPC)
 365     s.info.disassembler_options = (char *)"any";
 366     print_insn = print_insn_ppc;
 367 #elif defined(__aarch64__) && defined(CONFIG_ARM_A64_DIS)
 368     print_insn = print_insn_arm_a64;
 369 #elif defined(__alpha__)
 370     print_insn = print_insn_alpha;
 371 #elif defined(__sparc__)
 372     print_insn = print_insn_sparc;
 373     s.info.mach = bfd_mach_sparc_v9b;
 374 #elif defined(__arm__)
 375     print_insn = print_insn_arm;
 376 #elif defined(__MIPSEB__)
 377     print_insn = print_insn_big_mips;
 378 #elif defined(__MIPSEL__)
 379     print_insn = print_insn_little_mips;
 380 #elif defined(__m68k__)
 381     print_insn = print_insn_m68k;
 382 #elif defined(__s390__)
 383     print_insn = print_insn_s390;
 384 #elif defined(__hppa__)
 385     print_insn = print_insn_hppa;
 386 #elif defined(__ia64__)
 387     print_insn = print_insn_ia64;
 388 #endif
 389     if (print_insn == NULL) {
 390         print_insn = print_insn_od_host;
 391     }
 392     for (pc = (uintptr_t)code; size > 0; pc += count, size -= count) {
 393         fprintf(out, "0x%08" PRIxPTR ":  ", pc);
 394         count = print_insn(pc, &s.info);
 395         fprintf(out, "\n");
 396         if (count < 0)
 397             break;
 398     }
 399 }
 400
 401 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 402 const char *lookup_symbol(target_ulong orig_addr)
 403 {
 404     const char *symbol = "";
 405     struct syminfo *s;
 406
 407     for (s = syminfos; s; s = s->next) {
 408         symbol = s->lookup_symbol(s, orig_addr);
 409         if (symbol[0] != '\0') {
 410             break;
 411         }
 412     }
 413
 414     return symbol;
 415 }
 416
 417 #if !defined(CONFIG_USER_ONLY)
 418
 419 #include "monitor/monitor.h"
 420
 421 static int monitor_disas_is_physical;
 422
 423 static int
 424 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 425                      struct disassemble_info *info)
 426 {
 427     CPUDebug *s = container_of(info, CPUDebug, info);
 428
 429     if (monitor_disas_is_physical) {
 430         cpu_physical_memory_read(memaddr, myaddr, length);
 431     } else {
 432         cpu_memory_rw_debug(ENV_GET_CPU(s->env), memaddr, myaddr, length, 0);
 433     }
 434     return 0;
 435 }
 436
 437 static int GCC_FMT_ATTR(2, 3)
 438 monitor_fprintf(FILE *stream, const char *fmt, ...)
 439 {
 440     va_list ap;
 441     va_start(ap, fmt);
 442     monitor_vprintf((Monitor *)stream, fmt, ap);
 443     va_end(ap);
 444     return 0;
 445 }
 446
 447 void monitor_disas(Monitor *mon, CPUArchState *env,
 448                    target_ulong pc, int nb_insn, int is_physical, int flags)
 449 {
 450     int count, i;
 451     CPUDebug s;
 452     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 453
 454     INIT_DISASSEMBLE_INFO(s.info, (FILE *)mon, monitor_fprintf);
 455
 456     s.env = env;
 457     monitor_disas_is_physical = is_physical;
 458     s.info.read_memory_func = monitor_read_memory;
 459     s.info.print_address_func = generic_print_target_address;
 460
 461     s.info.buffer_vma = pc;
 462
 463 #ifdef TARGET_WORDS_BIGENDIAN
 464     s.info.endian = BFD_ENDIAN_BIG;
 465 #else
 466     s.info.endian = BFD_ENDIAN_LITTLE;
 467 #endif
 468 #if defined(TARGET_I386)
 469     if (flags == 2) {
 470         s.info.mach = bfd_mach_x86_64;
 471     } else if (flags == 1) {
 472         s.info.mach = bfd_mach_i386_i8086;
 473     } else {
 474         s.info.mach = bfd_mach_i386_i386;
 475     }
 476     print_insn = print_insn_i386;
 477 #elif defined(TARGET_ARM)
 478     print_insn = print_insn_arm;
 479 #elif defined(TARGET_ALPHA)
 480     print_insn = print_insn_alpha;
 481 #elif defined(TARGET_SPARC)
 482     print_insn = print_insn_sparc;
 483 #ifdef TARGET_SPARC64
 484     s.info.mach = bfd_mach_sparc_v9b;
 485 #endif
 486 #elif defined(TARGET_PPC)
 487 #ifdef TARGET_PPC64
 488     s.info.mach = bfd_mach_ppc64;
 489 #else
 490     s.info.mach = bfd_mach_ppc;
 491 #endif
 492     print_insn = print_insn_ppc;
 493 #elif defined(TARGET_M68K)
 494     print_insn = print_insn_m68k;
 495 #elif defined(TARGET_MIPS)
 496 #ifdef TARGET_WORDS_BIGENDIAN
 497     print_insn = print_insn_big_mips;
 498 #else
 499     print_insn = print_insn_little_mips;
 500 #endif
 501 #elif defined(TARGET_SH4)
 502     s.info.mach = bfd_mach_sh4;
 503     print_insn = print_insn_sh;
 504 #elif defined(TARGET_S390X)
 505     s.info.mach = bfd_mach_s390_64;
 506     print_insn = print_insn_s390;
 507 #elif defined(TARGET_MOXIE)
 508     s.info.mach = bfd_arch_moxie;
 509     print_insn = print_insn_moxie;
 510 #elif defined(TARGET_LM32)
 511     s.info.mach = bfd_mach_lm32;
 512     print_insn = print_insn_lm32;
 513 #else
 514     monitor_printf(mon, "0x" TARGET_FMT_lx
 515                    ": Asm output not supported on this arch\n", pc);
 516     return;
 517 #endif
 518
 519     for(i = 0; i < nb_insn; i++) {
 520         monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
 521         count = print_insn(pc, &s.info);
 522         monitor_printf(mon, "\n");
 523         if (count < 0)
 524             break;
 525         pc += count;
 526     }
 527 }
 528 #endif