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
 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 & 1) {
 229         print_insn = print_insn_thumb1;
 230     } else {
 231         print_insn = print_insn_arm;
 232     }
 233     if (flags & 2) {
 234 #ifdef TARGET_WORDS_BIGENDIAN
 235         s.info.endian = BFD_ENDIAN_LITTLE;
 236 #else
 237         s.info.endian = BFD_ENDIAN_BIG;
 238 #endif
 239     }
 240 #elif defined(TARGET_SPARC)
 241     print_insn = print_insn_sparc;
 242 #ifdef TARGET_SPARC64
 243     s.info.mach = bfd_mach_sparc_v9b;
 244 #endif
 245 #elif defined(TARGET_PPC)
 246     if (flags >> 16) {
 247         s.info.endian = BFD_ENDIAN_LITTLE;
 248     }
 249     if (flags & 0xFFFF) {
 250         /* If we have a precise definitions of the instructions set, use it */
 251         s.info.mach = flags & 0xFFFF;
 252     } else {
 253 #ifdef TARGET_PPC64
 254         s.info.mach = bfd_mach_ppc64;
 255 #else
 256         s.info.mach = bfd_mach_ppc;
 257 #endif
 258     }
 259     s.info.disassembler_options = (char *)"any";
 260     print_insn = print_insn_ppc;
 261 #elif defined(TARGET_M68K)
 262     print_insn = print_insn_m68k;
 263 #elif defined(TARGET_MIPS)
 264 #ifdef TARGET_WORDS_BIGENDIAN
 265     print_insn = print_insn_big_mips;
 266 #else
 267     print_insn = print_insn_little_mips;
 268 #endif
 269 #elif defined(TARGET_SH4)
 270     s.info.mach = bfd_mach_sh4;
 271     print_insn = print_insn_sh;
 272 #elif defined(TARGET_ALPHA)
 273     s.info.mach = bfd_mach_alpha_ev6;
 274     print_insn = print_insn_alpha;
 275 #elif defined(TARGET_CRIS)
 276     if (flags != 32) {
 277         s.info.mach = bfd_mach_cris_v0_v10;
 278         print_insn = print_insn_crisv10;
 279     } else {
 280         s.info.mach = bfd_mach_cris_v32;
 281         print_insn = print_insn_crisv32;
 282     }
 283 #elif defined(TARGET_S390X)
 284     s.info.mach = bfd_mach_s390_64;
 285     print_insn = print_insn_s390;
 286 #elif defined(TARGET_MICROBLAZE)
 287     s.info.mach = bfd_arch_microblaze;
 288     print_insn = print_insn_microblaze;
 289 #elif defined(TARGET_MOXIE)
 290     s.info.mach = bfd_arch_moxie;
 291     print_insn = print_insn_moxie;
 292 #elif defined(TARGET_LM32)
 293     s.info.mach = bfd_mach_lm32;
 294     print_insn = print_insn_lm32;
 295 #endif
 296     if (print_insn == NULL) {
 297         print_insn = print_insn_od_target;
 298     }
 299
 300     for (pc = code; size > 0; pc += count, size -= count) {
 301         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 302         count = print_insn(pc, &s.info);
 303 #if 0
 304         {
 305             int i;
 306             uint8_t b;
 307             fprintf(out, " {");
 308             for(i = 0; i < count; i++) {
 309                 target_read_memory(pc + i, &b, 1, &s.info);
 310                 fprintf(out, " %02x", b);
 311             }
 312             fprintf(out, " }");
 313         }
 314 #endif
 315         fprintf(out, "\n");
 316         if (count < 0)
 317             break;
 318         if (size < count) {
 319             fprintf(out,
 320                     "Disassembler disagrees with translator over instruction "
 321                     "decoding\n"
 322                     "Please report this to qemu-devel@nongnu.org\n");
 323             break;
 324         }
 325     }
 326 }
 327
 328 /* Disassemble this for me please... (debugging). */
 329 void disas(FILE *out, void *code, unsigned long size)
 330 {
 331     uintptr_t pc;
 332     int count;
 333     CPUDebug s;
 334     int (*print_insn)(bfd_vma pc, disassemble_info *info) = NULL;
 335
 336     INIT_DISASSEMBLE_INFO(s.info, out, fprintf);
 337     s.info.print_address_func = generic_print_host_address;
 338
 339     s.info.buffer = code;
 340     s.info.buffer_vma = (uintptr_t)code;
 341     s.info.buffer_length = size;
 342
 343 #ifdef HOST_WORDS_BIGENDIAN
 344     s.info.endian = BFD_ENDIAN_BIG;
 345 #else
 346     s.info.endian = BFD_ENDIAN_LITTLE;
 347 #endif
 348 #if defined(CONFIG_TCG_INTERPRETER)
 349     print_insn = print_insn_tci;
 350 #elif defined(__i386__)
 351     s.info.mach = bfd_mach_i386_i386;
 352     print_insn = print_insn_i386;
 353 #elif defined(__x86_64__)
 354     s.info.mach = bfd_mach_x86_64;
 355     print_insn = print_insn_i386;
 356 #elif defined(_ARCH_PPC)
 357     s.info.disassembler_options = (char *)"any";
 358     print_insn = print_insn_ppc;
 359 #elif defined(__alpha__)
 360     print_insn = print_insn_alpha;
 361 #elif defined(__sparc__)
 362     print_insn = print_insn_sparc;
 363     s.info.mach = bfd_mach_sparc_v9b;
 364 #elif defined(__arm__)
 365     print_insn = print_insn_arm;
 366 #elif defined(__MIPSEB__)
 367     print_insn = print_insn_big_mips;
 368 #elif defined(__MIPSEL__)
 369     print_insn = print_insn_little_mips;
 370 #elif defined(__m68k__)
 371     print_insn = print_insn_m68k;
 372 #elif defined(__s390__)
 373     print_insn = print_insn_s390;
 374 #elif defined(__hppa__)
 375     print_insn = print_insn_hppa;
 376 #elif defined(__ia64__)
 377     print_insn = print_insn_ia64;
 378 #endif
 379     if (print_insn == NULL) {
 380         print_insn = print_insn_od_host;
 381     }
 382     for (pc = (uintptr_t)code; size > 0; pc += count, size -= count) {
 383         fprintf(out, "0x%08" PRIxPTR ":  ", pc);
 384         count = print_insn(pc, &s.info);
 385         fprintf(out, "\n");
 386         if (count < 0)
 387             break;
 388     }
 389 }
 390
 391 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 392 const char *lookup_symbol(target_ulong orig_addr)
 393 {
 394     const char *symbol = "";
 395     struct syminfo *s;
 396
 397     for (s = syminfos; s; s = s->next) {
 398         symbol = s->lookup_symbol(s, orig_addr);
 399         if (symbol[0] != '\0') {
 400             break;
 401         }
 402     }
 403
 404     return symbol;
 405 }
 406
 407 #if !defined(CONFIG_USER_ONLY)
 408
 409 #include "monitor/monitor.h"
 410
 411 static int monitor_disas_is_physical;
 412
 413 static int
 414 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 415                      struct disassemble_info *info)
 416 {
 417     CPUDebug *s = container_of(info, CPUDebug, info);
 418
 419     if (monitor_disas_is_physical) {
 420         cpu_physical_memory_read(memaddr, myaddr, length);
 421     } else {
 422         cpu_memory_rw_debug(ENV_GET_CPU(s->env), memaddr, myaddr, length, 0);
 423     }
 424     return 0;
 425 }
 426
 427 static int GCC_FMT_ATTR(2, 3)
 428 monitor_fprintf(FILE *stream, const char *fmt, ...)
 429 {
 430     va_list ap;
 431     va_start(ap, fmt);
 432     monitor_vprintf((Monitor *)stream, fmt, ap);
 433     va_end(ap);
 434     return 0;
 435 }
 436
 437 void monitor_disas(Monitor *mon, CPUArchState *env,
 438                    target_ulong pc, int nb_insn, int is_physical, int flags)
 439 {
 440     int count, i;
 441     CPUDebug s;
 442     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 443
 444     INIT_DISASSEMBLE_INFO(s.info, (FILE *)mon, monitor_fprintf);
 445
 446     s.env = env;
 447     monitor_disas_is_physical = is_physical;
 448     s.info.read_memory_func = monitor_read_memory;
 449     s.info.print_address_func = generic_print_target_address;
 450
 451     s.info.buffer_vma = pc;
 452
 453 #ifdef TARGET_WORDS_BIGENDIAN
 454     s.info.endian = BFD_ENDIAN_BIG;
 455 #else
 456     s.info.endian = BFD_ENDIAN_LITTLE;
 457 #endif
 458 #if defined(TARGET_I386)
 459     if (flags == 2) {
 460         s.info.mach = bfd_mach_x86_64;
 461     } else if (flags == 1) {
 462         s.info.mach = bfd_mach_i386_i8086;
 463     } else {
 464         s.info.mach = bfd_mach_i386_i386;
 465     }
 466     print_insn = print_insn_i386;
 467 #elif defined(TARGET_ARM)
 468     print_insn = print_insn_arm;
 469 #elif defined(TARGET_ALPHA)
 470     print_insn = print_insn_alpha;
 471 #elif defined(TARGET_SPARC)
 472     print_insn = print_insn_sparc;
 473 #ifdef TARGET_SPARC64
 474     s.info.mach = bfd_mach_sparc_v9b;
 475 #endif
 476 #elif defined(TARGET_PPC)
 477 #ifdef TARGET_PPC64
 478     s.info.mach = bfd_mach_ppc64;
 479 #else
 480     s.info.mach = bfd_mach_ppc;
 481 #endif
 482     print_insn = print_insn_ppc;
 483 #elif defined(TARGET_M68K)
 484     print_insn = print_insn_m68k;
 485 #elif defined(TARGET_MIPS)
 486 #ifdef TARGET_WORDS_BIGENDIAN
 487     print_insn = print_insn_big_mips;
 488 #else
 489     print_insn = print_insn_little_mips;
 490 #endif
 491 #elif defined(TARGET_SH4)
 492     s.info.mach = bfd_mach_sh4;
 493     print_insn = print_insn_sh;
 494 #elif defined(TARGET_S390X)
 495     s.info.mach = bfd_mach_s390_64;
 496     print_insn = print_insn_s390;
 497 #elif defined(TARGET_MOXIE)
 498     s.info.mach = bfd_arch_moxie;
 499     print_insn = print_insn_moxie;
 500 #elif defined(TARGET_LM32)
 501     s.info.mach = bfd_mach_lm32;
 502     print_insn = print_insn_lm32;
 503 #else
 504     monitor_printf(mon, "0x" TARGET_FMT_lx
 505                    ": Asm output not supported on this arch\n", pc);
 506     return;
 507 #endif
 508
 509     for(i = 0; i < nb_insn; i++) {
 510         monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
 511         count = print_insn(pc, &s.info);
 512         monitor_printf(mon, "\n");
 513         if (count < 0)
 514             break;
 515         pc += count;
 516     }
 517 }
 518 #endif