disas.c

   1 /* General "disassemble this chunk" code.  Used for debugging. */
   2 #include "config.h"
   3 #include "dis-asm.h"
   4 #include "elf.h"
   5 #include <errno.h>
   6
   7 #include "cpu.h"
   8 #include "disas.h"
   9
  10 /* Filled in by elfload.c.  Simplistic, but will do for now. */
  11 struct syminfo *syminfos = NULL;
  12
  13 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  14    Transfer them to myaddr.  */
  15 int
  16 buffer_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
  17                    struct disassemble_info *info)
  18 {
  19     if (memaddr < info->buffer_vma
  20         || memaddr + length > info->buffer_vma + info->buffer_length)
  21         /* Out of bounds.  Use EIO because GDB uses it.  */
  22         return EIO;
  23     memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
  24     return 0;
  25 }
  26
  27 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  28    Transfer them to myaddr.  */
  29 static int
  30 target_read_memory (bfd_vma memaddr,
  31                     bfd_byte *myaddr,
  32                     int length,
  33                     struct disassemble_info *info)
  34 {
  35     cpu_memory_rw_debug(cpu_single_env, memaddr, myaddr, length, 0);
  36     return 0;
  37 }
  38
  39 /* Print an error message.  We can assume that this is in response to
  40    an error return from buffer_read_memory.  */
  41 void
  42 perror_memory (int status, bfd_vma memaddr, struct disassemble_info *info)
  43 {
  44   if (status != EIO)
  45     /* Can't happen.  */
  46     (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
  47   else
  48     /* Actually, address between memaddr and memaddr + len was
  49        out of bounds.  */
  50     (*info->fprintf_func) (info->stream,
  51                            "Address 0x%" PRIx64 " is out of bounds.\n", memaddr);
  52 }
  53
  54 /* This could be in a separate file, to save minuscule amounts of space
  55    in statically linked executables.  */
  56
  57 /* Just print the address is hex.  This is included for completeness even
  58    though both GDB and objdump provide their own (to print symbolic
  59    addresses).  */
  60
  61 void
  62 generic_print_address (bfd_vma addr, struct disassemble_info *info)
  63 {
  64     (*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);
  65 }
  66
  67 /* Print address in hex, truncated to the width of a target virtual address. */
  68 static void
  69 generic_print_target_address(bfd_vma addr, struct disassemble_info *info)
  70 {
  71     uint64_t mask = ~0ULL >> (64 - TARGET_VIRT_ADDR_SPACE_BITS);
  72     generic_print_address(addr & mask, info);
  73 }
  74
  75 /* Print address in hex, truncated to the width of a host virtual address. */
  76 static void
  77 generic_print_host_address(bfd_vma addr, struct disassemble_info *info)
  78 {
  79     uint64_t mask = ~0ULL >> (64 - (sizeof(void *) * 8));
  80     generic_print_address(addr & mask, info);
  81 }
  82
  83 /* Just return the given address.  */
  84
  85 int
  86 generic_symbol_at_address (bfd_vma addr, struct disassemble_info *info)
  87 {
  88   return 1;
  89 }
  90
  91 bfd_vma bfd_getl64 (const bfd_byte *addr)
  92 {
  93   unsigned long long v;
  94
  95   v = (unsigned long long) addr[0];
  96   v |= (unsigned long long) addr[1] << 8;
  97   v |= (unsigned long long) addr[2] << 16;
  98   v |= (unsigned long long) addr[3] << 24;
  99   v |= (unsigned long long) addr[4] << 32;
 100   v |= (unsigned long long) addr[5] << 40;
 101   v |= (unsigned long long) addr[6] << 48;
 102   v |= (unsigned long long) addr[7] << 56;
 103   return (bfd_vma) v;
 104 }
 105
 106 bfd_vma bfd_getl32 (const bfd_byte *addr)
 107 {
 108   unsigned long v;
 109
 110   v = (unsigned long) addr[0];
 111   v |= (unsigned long) addr[1] << 8;
 112   v |= (unsigned long) addr[2] << 16;
 113   v |= (unsigned long) addr[3] << 24;
 114   return (bfd_vma) v;
 115 }
 116
 117 bfd_vma bfd_getb32 (const bfd_byte *addr)
 118 {
 119   unsigned long v;
 120
 121   v = (unsigned long) addr[0] << 24;
 122   v |= (unsigned long) addr[1] << 16;
 123   v |= (unsigned long) addr[2] << 8;
 124   v |= (unsigned long) addr[3];
 125   return (bfd_vma) v;
 126 }
 127
 128 bfd_vma bfd_getl16 (const bfd_byte *addr)
 129 {
 130   unsigned long v;
 131
 132   v = (unsigned long) addr[0];
 133   v |= (unsigned long) addr[1] << 8;
 134   return (bfd_vma) v;
 135 }
 136
 137 bfd_vma bfd_getb16 (const bfd_byte *addr)
 138 {
 139   unsigned long v;
 140
 141   v = (unsigned long) addr[0] << 24;
 142   v |= (unsigned long) addr[1] << 16;
 143   return (bfd_vma) v;
 144 }
 145
 146 #ifdef TARGET_ARM
 147 static int
 148 print_insn_thumb1(bfd_vma pc, disassemble_info *info)
 149 {
 150   return print_insn_arm(pc | 1, info);
 151 }
 152 #endif
 153
 154 /* Disassemble this for me please... (debugging). 'flags' has the following
 155    values:
 156     i386 - 1 means 16 bit code, 2 means 64 bit code
 157     arm  - bit 0 = thumb, bit 1 = reverse endian
 158     ppc  - nonzero means little endian
 159     other targets - unused
 160  */
 161 void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
 162 {
 163     target_ulong pc;
 164     int count;
 165     struct disassemble_info disasm_info;
 166     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 167
 168     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 169
 170     disasm_info.read_memory_func = target_read_memory;
 171     disasm_info.buffer_vma = code;
 172     disasm_info.buffer_length = size;
 173     disasm_info.print_address_func = generic_print_target_address;
 174
 175 #ifdef TARGET_WORDS_BIGENDIAN
 176     disasm_info.endian = BFD_ENDIAN_BIG;
 177 #else
 178     disasm_info.endian = BFD_ENDIAN_LITTLE;
 179 #endif
 180 #if defined(TARGET_I386)
 181     if (flags == 2)
 182         disasm_info.mach = bfd_mach_x86_64;
 183     else if (flags == 1)
 184         disasm_info.mach = bfd_mach_i386_i8086;
 185     else
 186         disasm_info.mach = bfd_mach_i386_i386;
 187     print_insn = print_insn_i386;
 188 #elif defined(TARGET_ARM)
 189     if (flags & 1) {
 190         print_insn = print_insn_thumb1;
 191     } else {
 192         print_insn = print_insn_arm;
 193     }
 194     if (flags & 2) {
 195 #ifdef TARGET_WORDS_BIGENDIAN
 196         disasm_info.endian = BFD_ENDIAN_LITTLE;
 197 #else
 198         disasm_info.endian = BFD_ENDIAN_BIG;
 199 #endif
 200     }
 201 #elif defined(TARGET_SPARC)
 202     print_insn = print_insn_sparc;
 203 #ifdef TARGET_SPARC64
 204     disasm_info.mach = bfd_mach_sparc_v9b;
 205 #endif
 206 #elif defined(TARGET_PPC)
 207     if (flags >> 16)
 208         disasm_info.endian = BFD_ENDIAN_LITTLE;
 209     if (flags & 0xFFFF) {
 210         /* If we have a precise definitions of the instructions set, use it */
 211         disasm_info.mach = flags & 0xFFFF;
 212     } else {
 213 #ifdef TARGET_PPC64
 214         disasm_info.mach = bfd_mach_ppc64;
 215 #else
 216         disasm_info.mach = bfd_mach_ppc;
 217 #endif
 218     }
 219     print_insn = print_insn_ppc;
 220 #elif defined(TARGET_M68K)
 221     print_insn = print_insn_m68k;
 222 #elif defined(TARGET_MIPS)
 223 #ifdef TARGET_WORDS_BIGENDIAN
 224     print_insn = print_insn_big_mips;
 225 #else
 226     print_insn = print_insn_little_mips;
 227 #endif
 228 #elif defined(TARGET_SH4)
 229     disasm_info.mach = bfd_mach_sh4;
 230     print_insn = print_insn_sh;
 231 #elif defined(TARGET_ALPHA)
 232     disasm_info.mach = bfd_mach_alpha_ev6;
 233     print_insn = print_insn_alpha;
 234 #elif defined(TARGET_CRIS)
 235     if (flags != 32) {
 236         disasm_info.mach = bfd_mach_cris_v0_v10;
 237         print_insn = print_insn_crisv10;
 238     } else {
 239         disasm_info.mach = bfd_mach_cris_v32;
 240         print_insn = print_insn_crisv32;
 241     }
 242 #elif defined(TARGET_S390X)
 243     disasm_info.mach = bfd_mach_s390_64;
 244     print_insn = print_insn_s390;
 245 #elif defined(TARGET_MICROBLAZE)
 246     disasm_info.mach = bfd_arch_microblaze;
 247     print_insn = print_insn_microblaze;
 248 #elif defined(TARGET_LM32)
 249     disasm_info.mach = bfd_mach_lm32;
 250     print_insn = print_insn_lm32;
 251 #else
 252     fprintf(out, "0x" TARGET_FMT_lx
 253             ": Asm output not supported on this arch\n", code);
 254     return;
 255 #endif
 256
 257     for (pc = code; size > 0; pc += count, size -= count) {
 258         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 259         count = print_insn(pc, &disasm_info);
 260 #if 0
 261         {
 262             int i;
 263             uint8_t b;
 264             fprintf(out, " {");
 265             for(i = 0; i < count; i++) {
 266                 target_read_memory(pc + i, &b, 1, &disasm_info);
 267                 fprintf(out, " %02x", b);
 268             }
 269             fprintf(out, " }");
 270         }
 271 #endif
 272         fprintf(out, "\n");
 273         if (count < 0)
 274             break;
 275         if (size < count) {
 276             fprintf(out,
 277                     "Disassembler disagrees with translator over instruction "
 278                     "decoding\n"
 279                     "Please report this to qemu-devel@nongnu.org\n");
 280             break;
 281         }
 282     }
 283 }
 284
 285 /* Disassemble this for me please... (debugging). */
 286 void disas(FILE *out, void *code, unsigned long size)
 287 {
 288     uintptr_t pc;
 289     int count;
 290     struct disassemble_info disasm_info;
 291     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 292
 293     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 294     disasm_info.print_address_func = generic_print_host_address;
 295
 296     disasm_info.buffer = code;
 297     disasm_info.buffer_vma = (uintptr_t)code;
 298     disasm_info.buffer_length = size;
 299
 300 #ifdef HOST_WORDS_BIGENDIAN
 301     disasm_info.endian = BFD_ENDIAN_BIG;
 302 #else
 303     disasm_info.endian = BFD_ENDIAN_LITTLE;
 304 #endif
 305 #if defined(CONFIG_TCG_INTERPRETER)
 306     print_insn = print_insn_tci;
 307 #elif defined(__i386__)
 308     disasm_info.mach = bfd_mach_i386_i386;
 309     print_insn = print_insn_i386;
 310 #elif defined(__x86_64__)
 311     disasm_info.mach = bfd_mach_x86_64;
 312     print_insn = print_insn_i386;
 313 #elif defined(_ARCH_PPC)
 314     print_insn = print_insn_ppc;
 315 #elif defined(__alpha__)
 316     print_insn = print_insn_alpha;
 317 #elif defined(__sparc__)
 318     print_insn = print_insn_sparc;
 319 #if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
 320     disasm_info.mach = bfd_mach_sparc_v9b;
 321 #endif
 322 #elif defined(__arm__)
 323     print_insn = print_insn_arm;
 324 #elif defined(__MIPSEB__)
 325     print_insn = print_insn_big_mips;
 326 #elif defined(__MIPSEL__)
 327     print_insn = print_insn_little_mips;
 328 #elif defined(__m68k__)
 329     print_insn = print_insn_m68k;
 330 #elif defined(__s390__)
 331     print_insn = print_insn_s390;
 332 #elif defined(__hppa__)
 333     print_insn = print_insn_hppa;
 334 #elif defined(__ia64__)
 335     print_insn = print_insn_ia64;
 336 #else
 337     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 338             (long) code);
 339     return;
 340 #endif
 341     for (pc = (uintptr_t)code; size > 0; pc += count, size -= count) {
 342         fprintf(out, "0x%08" PRIxPTR ":  ", pc);
 343         count = print_insn(pc, &disasm_info);
 344         fprintf(out, "\n");
 345         if (count < 0)
 346             break;
 347     }
 348 }
 349
 350 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 351 const char *lookup_symbol(target_ulong orig_addr)
 352 {
 353     const char *symbol = "";
 354     struct syminfo *s;
 355
 356     for (s = syminfos; s; s = s->next) {
 357         symbol = s->lookup_symbol(s, orig_addr);
 358         if (symbol[0] != '\0') {
 359             break;
 360         }
 361     }
 362
 363     return symbol;
 364 }
 365
 366 #if !defined(CONFIG_USER_ONLY)
 367
 368 #include "monitor.h"
 369
 370 static int monitor_disas_is_physical;
 371 static CPUArchState *monitor_disas_env;
 372
 373 static int
 374 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 375                      struct disassemble_info *info)
 376 {
 377     if (monitor_disas_is_physical) {
 378         cpu_physical_memory_read(memaddr, myaddr, length);
 379     } else {
 380         cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
 381     }
 382     return 0;
 383 }
 384
 385 static int GCC_FMT_ATTR(2, 3)
 386 monitor_fprintf(FILE *stream, const char *fmt, ...)
 387 {
 388     va_list ap;
 389     va_start(ap, fmt);
 390     monitor_vprintf((Monitor *)stream, fmt, ap);
 391     va_end(ap);
 392     return 0;
 393 }
 394
 395 void monitor_disas(Monitor *mon, CPUArchState *env,
 396                    target_ulong pc, int nb_insn, int is_physical, int flags)
 397 {
 398     int count, i;
 399     struct disassemble_info disasm_info;
 400     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 401
 402     INIT_DISASSEMBLE_INFO(disasm_info, (FILE *)mon, monitor_fprintf);
 403
 404     monitor_disas_env = env;
 405     monitor_disas_is_physical = is_physical;
 406     disasm_info.read_memory_func = monitor_read_memory;
 407     disasm_info.print_address_func = generic_print_target_address;
 408
 409     disasm_info.buffer_vma = pc;
 410
 411 #ifdef TARGET_WORDS_BIGENDIAN
 412     disasm_info.endian = BFD_ENDIAN_BIG;
 413 #else
 414     disasm_info.endian = BFD_ENDIAN_LITTLE;
 415 #endif
 416 #if defined(TARGET_I386)
 417     if (flags == 2)
 418         disasm_info.mach = bfd_mach_x86_64;
 419     else if (flags == 1)
 420         disasm_info.mach = bfd_mach_i386_i8086;
 421     else
 422         disasm_info.mach = bfd_mach_i386_i386;
 423     print_insn = print_insn_i386;
 424 #elif defined(TARGET_ARM)
 425     print_insn = print_insn_arm;
 426 #elif defined(TARGET_ALPHA)
 427     print_insn = print_insn_alpha;
 428 #elif defined(TARGET_SPARC)
 429     print_insn = print_insn_sparc;
 430 #ifdef TARGET_SPARC64
 431     disasm_info.mach = bfd_mach_sparc_v9b;
 432 #endif
 433 #elif defined(TARGET_PPC)
 434 #ifdef TARGET_PPC64
 435     disasm_info.mach = bfd_mach_ppc64;
 436 #else
 437     disasm_info.mach = bfd_mach_ppc;
 438 #endif
 439     print_insn = print_insn_ppc;
 440 #elif defined(TARGET_M68K)
 441     print_insn = print_insn_m68k;
 442 #elif defined(TARGET_MIPS)
 443 #ifdef TARGET_WORDS_BIGENDIAN
 444     print_insn = print_insn_big_mips;
 445 #else
 446     print_insn = print_insn_little_mips;
 447 #endif
 448 #elif defined(TARGET_SH4)
 449     disasm_info.mach = bfd_mach_sh4;
 450     print_insn = print_insn_sh;
 451 #elif defined(TARGET_S390X)
 452     disasm_info.mach = bfd_mach_s390_64;
 453     print_insn = print_insn_s390;
 454 #elif defined(TARGET_LM32)
 455     disasm_info.mach = bfd_mach_lm32;
 456     print_insn = print_insn_lm32;
 457 #else
 458     monitor_printf(mon, "0x" TARGET_FMT_lx
 459                    ": Asm output not supported on this arch\n", pc);
 460     return;
 461 #endif
 462
 463     for(i = 0; i < nb_insn; i++) {
 464         monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
 465         count = print_insn(pc, &disasm_info);
 466         monitor_printf(mon, "\n");
 467         if (count < 0)
 468             break;
 469         pc += count;
 470     }
 471 }
 472 #endif