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(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 /* Disassemble this for me please... (debugging). 'flags' has the following
 162    values:
 163     i386 - 1 means 16 bit code, 2 means 64 bit code
 164     arm  - bit 0 = thumb, bit 1 = reverse endian
 165     ppc  - nonzero means little endian
 166     other targets - unused
 167  */
 168 void target_disas(FILE *out, CPUArchState *env, target_ulong code,
 169                   target_ulong size, int flags)
 170 {
 171     target_ulong pc;
 172     int count;
 173     CPUDebug s;
 174     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 175
 176     INIT_DISASSEMBLE_INFO(s.info, out, fprintf);
 177
 178     s.env = env;
 179     s.info.read_memory_func = target_read_memory;
 180     s.info.buffer_vma = code;
 181     s.info.buffer_length = size;
 182     s.info.print_address_func = generic_print_target_address;
 183
 184 #ifdef TARGET_WORDS_BIGENDIAN
 185     s.info.endian = BFD_ENDIAN_BIG;
 186 #else
 187     s.info.endian = BFD_ENDIAN_LITTLE;
 188 #endif
 189 #if defined(TARGET_I386)
 190     if (flags == 2) {
 191         s.info.mach = bfd_mach_x86_64;
 192     } else if (flags == 1) {
 193         s.info.mach = bfd_mach_i386_i8086;
 194     } else {
 195         s.info.mach = bfd_mach_i386_i386;
 196     }
 197     print_insn = print_insn_i386;
 198 #elif defined(TARGET_ARM)
 199     if (flags & 1) {
 200         print_insn = print_insn_thumb1;
 201     } else {
 202         print_insn = print_insn_arm;
 203     }
 204     if (flags & 2) {
 205 #ifdef TARGET_WORDS_BIGENDIAN
 206         s.info.endian = BFD_ENDIAN_LITTLE;
 207 #else
 208         s.info.endian = BFD_ENDIAN_BIG;
 209 #endif
 210     }
 211 #elif defined(TARGET_SPARC)
 212     print_insn = print_insn_sparc;
 213 #ifdef TARGET_SPARC64
 214     s.info.mach = bfd_mach_sparc_v9b;
 215 #endif
 216 #elif defined(TARGET_PPC)
 217     if (flags >> 16) {
 218         s.info.endian = BFD_ENDIAN_LITTLE;
 219     }
 220     if (flags & 0xFFFF) {
 221         /* If we have a precise definitions of the instructions set, use it */
 222         s.info.mach = flags & 0xFFFF;
 223     } else {
 224 #ifdef TARGET_PPC64
 225         s.info.mach = bfd_mach_ppc64;
 226 #else
 227         s.info.mach = bfd_mach_ppc;
 228 #endif
 229     }
 230     print_insn = print_insn_ppc;
 231 #elif defined(TARGET_M68K)
 232     print_insn = print_insn_m68k;
 233 #elif defined(TARGET_MIPS)
 234 #ifdef TARGET_WORDS_BIGENDIAN
 235     print_insn = print_insn_big_mips;
 236 #else
 237     print_insn = print_insn_little_mips;
 238 #endif
 239 #elif defined(TARGET_SH4)
 240     s.info.mach = bfd_mach_sh4;
 241     print_insn = print_insn_sh;
 242 #elif defined(TARGET_ALPHA)
 243     s.info.mach = bfd_mach_alpha_ev6;
 244     print_insn = print_insn_alpha;
 245 #elif defined(TARGET_CRIS)
 246     if (flags != 32) {
 247         s.info.mach = bfd_mach_cris_v0_v10;
 248         print_insn = print_insn_crisv10;
 249     } else {
 250         s.info.mach = bfd_mach_cris_v32;
 251         print_insn = print_insn_crisv32;
 252     }
 253 #elif defined(TARGET_S390X)
 254     s.info.mach = bfd_mach_s390_64;
 255     print_insn = print_insn_s390;
 256 #elif defined(TARGET_MICROBLAZE)
 257     s.info.mach = bfd_arch_microblaze;
 258     print_insn = print_insn_microblaze;
 259 #elif defined(TARGET_LM32)
 260     s.info.mach = bfd_mach_lm32;
 261     print_insn = print_insn_lm32;
 262 #else
 263     fprintf(out, "0x" TARGET_FMT_lx
 264             ": Asm output not supported on this arch\n", code);
 265     return;
 266 #endif
 267
 268     for (pc = code; size > 0; pc += count, size -= count) {
 269         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 270         count = print_insn(pc, &s.info);
 271 #if 0
 272         {
 273             int i;
 274             uint8_t b;
 275             fprintf(out, " {");
 276             for(i = 0; i < count; i++) {
 277                 target_read_memory(pc + i, &b, 1, &s.info);
 278                 fprintf(out, " %02x", b);
 279             }
 280             fprintf(out, " }");
 281         }
 282 #endif
 283         fprintf(out, "\n");
 284         if (count < 0)
 285             break;
 286         if (size < count) {
 287             fprintf(out,
 288                     "Disassembler disagrees with translator over instruction "
 289                     "decoding\n"
 290                     "Please report this to qemu-devel@nongnu.org\n");
 291             break;
 292         }
 293     }
 294 }
 295
 296 /* Disassemble this for me please... (debugging). */
 297 void disas(FILE *out, void *code, unsigned long size)
 298 {
 299     uintptr_t pc;
 300     int count;
 301     CPUDebug s;
 302     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 303
 304     INIT_DISASSEMBLE_INFO(s.info, out, fprintf);
 305     s.info.print_address_func = generic_print_host_address;
 306
 307     s.info.buffer = code;
 308     s.info.buffer_vma = (uintptr_t)code;
 309     s.info.buffer_length = size;
 310
 311 #ifdef HOST_WORDS_BIGENDIAN
 312     s.info.endian = BFD_ENDIAN_BIG;
 313 #else
 314     s.info.endian = BFD_ENDIAN_LITTLE;
 315 #endif
 316 #if defined(CONFIG_TCG_INTERPRETER)
 317     print_insn = print_insn_tci;
 318 #elif defined(__i386__)
 319     s.info.mach = bfd_mach_i386_i386;
 320     print_insn = print_insn_i386;
 321 #elif defined(__x86_64__)
 322     s.info.mach = bfd_mach_x86_64;
 323     print_insn = print_insn_i386;
 324 #elif defined(_ARCH_PPC)
 325     print_insn = print_insn_ppc;
 326 #elif defined(__alpha__)
 327     print_insn = print_insn_alpha;
 328 #elif defined(__sparc__)
 329     print_insn = print_insn_sparc;
 330     s.info.mach = bfd_mach_sparc_v9b;
 331 #elif defined(__arm__)
 332     print_insn = print_insn_arm;
 333 #elif defined(__MIPSEB__)
 334     print_insn = print_insn_big_mips;
 335 #elif defined(__MIPSEL__)
 336     print_insn = print_insn_little_mips;
 337 #elif defined(__m68k__)
 338     print_insn = print_insn_m68k;
 339 #elif defined(__s390__)
 340     print_insn = print_insn_s390;
 341 #elif defined(__hppa__)
 342     print_insn = print_insn_hppa;
 343 #elif defined(__ia64__)
 344     print_insn = print_insn_ia64;
 345 #else
 346     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 347             (long) code);
 348     return;
 349 #endif
 350     for (pc = (uintptr_t)code; size > 0; pc += count, size -= count) {
 351         fprintf(out, "0x%08" PRIxPTR ":  ", pc);
 352         count = print_insn(pc, &s.info);
 353         fprintf(out, "\n");
 354         if (count < 0)
 355             break;
 356     }
 357 }
 358
 359 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 360 const char *lookup_symbol(target_ulong orig_addr)
 361 {
 362     const char *symbol = "";
 363     struct syminfo *s;
 364
 365     for (s = syminfos; s; s = s->next) {
 366         symbol = s->lookup_symbol(s, orig_addr);
 367         if (symbol[0] != '\0') {
 368             break;
 369         }
 370     }
 371
 372     return symbol;
 373 }
 374
 375 #if !defined(CONFIG_USER_ONLY)
 376
 377 #include "monitor/monitor.h"
 378
 379 static int monitor_disas_is_physical;
 380
 381 static int
 382 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 383                      struct disassemble_info *info)
 384 {
 385     CPUDebug *s = container_of(info, CPUDebug, info);
 386
 387     if (monitor_disas_is_physical) {
 388         cpu_physical_memory_read(memaddr, myaddr, length);
 389     } else {
 390         cpu_memory_rw_debug(s->env, memaddr,myaddr, length, 0);
 391     }
 392     return 0;
 393 }
 394
 395 static int GCC_FMT_ATTR(2, 3)
 396 monitor_fprintf(FILE *stream, const char *fmt, ...)
 397 {
 398     va_list ap;
 399     va_start(ap, fmt);
 400     monitor_vprintf((Monitor *)stream, fmt, ap);
 401     va_end(ap);
 402     return 0;
 403 }
 404
 405 void monitor_disas(Monitor *mon, CPUArchState *env,
 406                    target_ulong pc, int nb_insn, int is_physical, int flags)
 407 {
 408     int count, i;
 409     CPUDebug s;
 410     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 411
 412     INIT_DISASSEMBLE_INFO(s.info, (FILE *)mon, monitor_fprintf);
 413
 414     s.env = env;
 415     monitor_disas_is_physical = is_physical;
 416     s.info.read_memory_func = monitor_read_memory;
 417     s.info.print_address_func = generic_print_target_address;
 418
 419     s.info.buffer_vma = pc;
 420
 421 #ifdef TARGET_WORDS_BIGENDIAN
 422     s.info.endian = BFD_ENDIAN_BIG;
 423 #else
 424     s.info.endian = BFD_ENDIAN_LITTLE;
 425 #endif
 426 #if defined(TARGET_I386)
 427     if (flags == 2) {
 428         s.info.mach = bfd_mach_x86_64;
 429     } else if (flags == 1) {
 430         s.info.mach = bfd_mach_i386_i8086;
 431     } else {
 432         s.info.mach = bfd_mach_i386_i386;
 433     }
 434     print_insn = print_insn_i386;
 435 #elif defined(TARGET_ARM)
 436     print_insn = print_insn_arm;
 437 #elif defined(TARGET_ALPHA)
 438     print_insn = print_insn_alpha;
 439 #elif defined(TARGET_SPARC)
 440     print_insn = print_insn_sparc;
 441 #ifdef TARGET_SPARC64
 442     s.info.mach = bfd_mach_sparc_v9b;
 443 #endif
 444 #elif defined(TARGET_PPC)
 445 #ifdef TARGET_PPC64
 446     s.info.mach = bfd_mach_ppc64;
 447 #else
 448     s.info.mach = bfd_mach_ppc;
 449 #endif
 450     print_insn = print_insn_ppc;
 451 #elif defined(TARGET_M68K)
 452     print_insn = print_insn_m68k;
 453 #elif defined(TARGET_MIPS)
 454 #ifdef TARGET_WORDS_BIGENDIAN
 455     print_insn = print_insn_big_mips;
 456 #else
 457     print_insn = print_insn_little_mips;
 458 #endif
 459 #elif defined(TARGET_SH4)
 460     s.info.mach = bfd_mach_sh4;
 461     print_insn = print_insn_sh;
 462 #elif defined(TARGET_S390X)
 463     s.info.mach = bfd_mach_s390_64;
 464     print_insn = print_insn_s390;
 465 #elif defined(TARGET_LM32)
 466     s.info.mach = bfd_mach_lm32;
 467     print_insn = print_insn_lm32;
 468 #else
 469     monitor_printf(mon, "0x" TARGET_FMT_lx
 470                    ": Asm output not supported on this arch\n", pc);
 471     return;
 472 #endif
 473
 474     for(i = 0; i < nb_insn; i++) {
 475         monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
 476         count = print_insn(pc, &s.info);
 477         monitor_printf(mon, "\n");
 478         if (count < 0)
 479             break;
 480         pc += count;
 481     }
 482 }
 483 #endif