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 "exec-all.h"
   9 #include "disas.h"
  10
  11 /* Filled in by elfload.c.  Simplistic, but will do for now. */
  12 struct syminfo *syminfos = NULL;
  13
  14 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  15    Transfer them to myaddr.  */
  16 int
  17 buffer_read_memory (memaddr, myaddr, length, info)
  18      bfd_vma memaddr;
  19      bfd_byte *myaddr;
  20      int length;
  21      struct disassemble_info *info;
  22 {
  23     if (memaddr < info->buffer_vma
  24         || memaddr + length > info->buffer_vma + info->buffer_length)
  25         /* Out of bounds.  Use EIO because GDB uses it.  */
  26         return EIO;
  27     memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
  28     return 0;
  29 }
  30
  31 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  32    Transfer them to myaddr.  */
  33 static int
  34 target_read_memory (bfd_vma memaddr,
  35                     bfd_byte *myaddr,
  36                     int length,
  37                     struct disassemble_info *info)
  38 {
  39     int i;
  40     for(i = 0; i < length; i++) {
  41         myaddr[i] = ldub_code(memaddr + i);
  42     }
  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 (status, memaddr, info)
  50      int status;
  51      bfd_vma memaddr;
  52      struct disassemble_info *info;
  53 {
  54   if (status != EIO)
  55     /* Can't happen.  */
  56     (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
  57   else
  58     /* Actually, address between memaddr and memaddr + len was
  59        out of bounds.  */
  60     (*info->fprintf_func) (info->stream,
  61                            "Address 0x%" PRIx64 " is out of bounds.\n", memaddr);
  62 }
  63
  64 /* This could be in a separate file, to save miniscule amounts of space
  65    in statically linked executables.  */
  66
  67 /* Just print the address is hex.  This is included for completeness even
  68    though both GDB and objdump provide their own (to print symbolic
  69    addresses).  */
  70
  71 void
  72 generic_print_address (addr, info)
  73      bfd_vma addr;
  74      struct disassemble_info *info;
  75 {
  76     (*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);
  77 }
  78
  79 /* Just return the given address.  */
  80
  81 int
  82 generic_symbol_at_address (addr, info)
  83      bfd_vma addr;
  84      struct disassemble_info * info;
  85 {
  86   return 1;
  87 }
  88
  89 bfd_vma bfd_getl32 (const bfd_byte *addr)
  90 {
  91   unsigned long v;
  92
  93   v = (unsigned long) addr[0];
  94   v |= (unsigned long) addr[1] << 8;
  95   v |= (unsigned long) addr[2] << 16;
  96   v |= (unsigned long) addr[3] << 24;
  97   return (bfd_vma) v;
  98 }
  99
 100 bfd_vma bfd_getb32 (const bfd_byte *addr)
 101 {
 102   unsigned long v;
 103
 104   v = (unsigned long) addr[0] << 24;
 105   v |= (unsigned long) addr[1] << 16;
 106   v |= (unsigned long) addr[2] << 8;
 107   v |= (unsigned long) addr[3];
 108   return (bfd_vma) v;
 109 }
 110
 111 bfd_vma bfd_getl16 (const bfd_byte *addr)
 112 {
 113   unsigned long v;
 114
 115   v = (unsigned long) addr[0];
 116   v |= (unsigned long) addr[1] << 8;
 117   return (bfd_vma) v;
 118 }
 119
 120 bfd_vma bfd_getb16 (const bfd_byte *addr)
 121 {
 122   unsigned long v;
 123
 124   v = (unsigned long) addr[0] << 24;
 125   v |= (unsigned long) addr[1] << 16;
 126   return (bfd_vma) v;
 127 }
 128
 129 #ifdef TARGET_ARM
 130 static int
 131 print_insn_thumb1(bfd_vma pc, disassemble_info *info)
 132 {
 133   return print_insn_arm(pc | 1, info);
 134 }
 135 #endif
 136
 137 /* Disassemble this for me please... (debugging). 'flags' has the following
 138    values:
 139     i386 - nonzero means 16 bit code
 140     arm  - nonzero means thumb code
 141     ppc  - nonzero means little endian
 142     other targets - unused
 143  */
 144 void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
 145 {
 146     target_ulong pc;
 147     int count;
 148     struct disassemble_info disasm_info;
 149     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 150
 151     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 152
 153     disasm_info.read_memory_func = target_read_memory;
 154     disasm_info.buffer_vma = code;
 155     disasm_info.buffer_length = size;
 156
 157 #ifdef TARGET_WORDS_BIGENDIAN
 158     disasm_info.endian = BFD_ENDIAN_BIG;
 159 #else
 160     disasm_info.endian = BFD_ENDIAN_LITTLE;
 161 #endif
 162 #if defined(TARGET_I386)
 163     if (flags == 2)
 164         disasm_info.mach = bfd_mach_x86_64;
 165     else if (flags == 1)
 166         disasm_info.mach = bfd_mach_i386_i8086;
 167     else
 168         disasm_info.mach = bfd_mach_i386_i386;
 169     print_insn = print_insn_i386;
 170 #elif defined(TARGET_ARM)
 171     if (flags)
 172         print_insn = print_insn_thumb1;
 173     else
 174         print_insn = print_insn_arm;
 175 #elif defined(TARGET_SPARC)
 176     print_insn = print_insn_sparc;
 177 #ifdef TARGET_SPARC64
 178     disasm_info.mach = bfd_mach_sparc_v9b;
 179 #endif
 180 #elif defined(TARGET_PPC)
 181     if (flags >> 16)
 182         disasm_info.endian = BFD_ENDIAN_LITTLE;
 183     if (flags & 0xFFFF) {
 184         /* If we have a precise definitions of the instructions set, use it */
 185         disasm_info.mach = flags & 0xFFFF;
 186     } else {
 187 #ifdef TARGET_PPC64
 188         disasm_info.mach = bfd_mach_ppc64;
 189 #else
 190         disasm_info.mach = bfd_mach_ppc;
 191 #endif
 192     }
 193     print_insn = print_insn_ppc;
 194 #elif defined(TARGET_M68K)
 195     print_insn = print_insn_m68k;
 196 #elif defined(TARGET_MIPS)
 197 #ifdef TARGET_WORDS_BIGENDIAN
 198     print_insn = print_insn_big_mips;
 199 #else
 200     print_insn = print_insn_little_mips;
 201 #endif
 202 #elif defined(TARGET_SH4)
 203     disasm_info.mach = bfd_mach_sh4;
 204     print_insn = print_insn_sh;
 205 #elif defined(TARGET_ALPHA)
 206     disasm_info.mach = bfd_mach_alpha;
 207     print_insn = print_insn_alpha;
 208 #elif defined(TARGET_CRIS)
 209     disasm_info.mach = bfd_mach_cris_v32;
 210     print_insn = print_insn_crisv32;
 211 #else
 212     fprintf(out, "0x" TARGET_FMT_lx
 213             ": Asm output not supported on this arch\n", code);
 214     return;
 215 #endif
 216
 217     for (pc = code; pc < code + size; pc += count) {
 218         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 219         count = print_insn(pc, &disasm_info);
 220 #if 0
 221         {
 222             int i;
 223             uint8_t b;
 224             fprintf(out, " {");
 225             for(i = 0; i < count; i++) {
 226                 target_read_memory(pc + i, &b, 1, &disasm_info);
 227                 fprintf(out, " %02x", b);
 228             }
 229             fprintf(out, " }");
 230         }
 231 #endif
 232         fprintf(out, "\n");
 233         if (count < 0)
 234             break;
 235     }
 236 }
 237
 238 /* Disassemble this for me please... (debugging). */
 239 void disas(FILE *out, void *code, unsigned long size)
 240 {
 241     unsigned long pc;
 242     int count;
 243     struct disassemble_info disasm_info;
 244     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 245
 246     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 247
 248     disasm_info.buffer = code;
 249     disasm_info.buffer_vma = (unsigned long)code;
 250     disasm_info.buffer_length = size;
 251
 252 #ifdef WORDS_BIGENDIAN
 253     disasm_info.endian = BFD_ENDIAN_BIG;
 254 #else
 255     disasm_info.endian = BFD_ENDIAN_LITTLE;
 256 #endif
 257 #if defined(__i386__)
 258     disasm_info.mach = bfd_mach_i386_i386;
 259     print_insn = print_insn_i386;
 260 #elif defined(__x86_64__)
 261     disasm_info.mach = bfd_mach_x86_64;
 262     print_insn = print_insn_i386;
 263 #elif defined(__powerpc__)
 264     print_insn = print_insn_ppc;
 265 #elif defined(__alpha__)
 266     print_insn = print_insn_alpha;
 267 #elif defined(__sparc__)
 268     print_insn = print_insn_sparc;
 269 #if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
 270     disasm_info.mach = bfd_mach_sparc_v9b;
 271 #endif
 272 #elif defined(__arm__)
 273     print_insn = print_insn_arm;
 274 #elif defined(__MIPSEB__)
 275     print_insn = print_insn_big_mips;
 276 #elif defined(__MIPSEL__)
 277     print_insn = print_insn_little_mips;
 278 #elif defined(__m68k__)
 279     print_insn = print_insn_m68k;
 280 #elif defined(__s390__)
 281     print_insn = print_insn_s390;
 282 #elif defined(__hppa__)
 283     print_insn = print_insn_hppa;
 284 #else
 285     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 286             (long) code);
 287     return;
 288 #endif
 289     for (pc = (unsigned long)code; pc < (unsigned long)code + size; pc += count) {
 290         fprintf(out, "0x%08lx:  ", pc);
 291 #ifdef __arm__
 292         /* since data is included in the code, it is better to
 293            display code data too */
 294         fprintf(out, "%08x  ", (int)bfd_getl32((const bfd_byte *)pc));
 295 #endif
 296         count = print_insn(pc, &disasm_info);
 297         fprintf(out, "\n");
 298         if (count < 0)
 299             break;
 300     }
 301 }
 302
 303 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 304 const char *lookup_symbol(target_ulong orig_addr)
 305 {
 306     unsigned int i;
 307     /* Hack, because we know this is x86. */
 308     Elf32_Sym *sym;
 309     struct syminfo *s;
 310     target_ulong addr;
 311
 312     for (s = syminfos; s; s = s->next) {
 313         sym = s->disas_symtab;
 314         for (i = 0; i < s->disas_num_syms; i++) {
 315             if (sym[i].st_shndx == SHN_UNDEF
 316                 || sym[i].st_shndx >= SHN_LORESERVE)
 317                 continue;
 318
 319             if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
 320                 continue;
 321
 322             addr = sym[i].st_value;
 323 #if defined(TARGET_ARM) || defined (TARGET_MIPS)
 324             /* The bottom address bit marks a Thumb or MIPS16 symbol.  */
 325             addr &= ~(target_ulong)1;
 326 #endif
 327             if (orig_addr >= addr
 328                 && orig_addr < addr + sym[i].st_size)
 329                 return s->disas_strtab + sym[i].st_name;
 330         }
 331     }
 332     return "";
 333 }
 334
 335 #if !defined(CONFIG_USER_ONLY)
 336
 337 void term_vprintf(const char *fmt, va_list ap);
 338 void term_printf(const char *fmt, ...);
 339
 340 static int monitor_disas_is_physical;
 341 static CPUState *monitor_disas_env;
 342
 343 static int
 344 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 345                      struct disassemble_info *info)
 346 {
 347     if (monitor_disas_is_physical) {
 348         cpu_physical_memory_rw(memaddr, myaddr, length, 0);
 349     } else {
 350         cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
 351     }
 352     return 0;
 353 }
 354
 355 static int monitor_fprintf(FILE *stream, const char *fmt, ...)
 356 {
 357     va_list ap;
 358     va_start(ap, fmt);
 359     term_vprintf(fmt, ap);
 360     va_end(ap);
 361     return 0;
 362 }
 363
 364 void monitor_disas(CPUState *env,
 365                    target_ulong pc, int nb_insn, int is_physical, int flags)
 366 {
 367     int count, i;
 368     struct disassemble_info disasm_info;
 369     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 370
 371     INIT_DISASSEMBLE_INFO(disasm_info, NULL, monitor_fprintf);
 372
 373     monitor_disas_env = env;
 374     monitor_disas_is_physical = is_physical;
 375     disasm_info.read_memory_func = monitor_read_memory;
 376
 377     disasm_info.buffer_vma = pc;
 378
 379 #ifdef TARGET_WORDS_BIGENDIAN
 380     disasm_info.endian = BFD_ENDIAN_BIG;
 381 #else
 382     disasm_info.endian = BFD_ENDIAN_LITTLE;
 383 #endif
 384 #if defined(TARGET_I386)
 385     if (flags == 2)
 386         disasm_info.mach = bfd_mach_x86_64;
 387     else if (flags == 1)
 388         disasm_info.mach = bfd_mach_i386_i8086;
 389     else
 390         disasm_info.mach = bfd_mach_i386_i386;
 391     print_insn = print_insn_i386;
 392 #elif defined(TARGET_ARM)
 393     print_insn = print_insn_arm;
 394 #elif defined(TARGET_ALPHA)
 395     print_insn = print_insn_alpha;
 396 #elif defined(TARGET_SPARC)
 397     print_insn = print_insn_sparc;
 398 #ifdef TARGET_SPARC64
 399     disasm_info.mach = bfd_mach_sparc_v9b;
 400 #endif
 401 #elif defined(TARGET_PPC)
 402 #ifdef TARGET_PPC64
 403     disasm_info.mach = bfd_mach_ppc64;
 404 #else
 405     disasm_info.mach = bfd_mach_ppc;
 406 #endif
 407     print_insn = print_insn_ppc;
 408 #elif defined(TARGET_M68K)
 409     print_insn = print_insn_m68k;
 410 #elif defined(TARGET_MIPS)
 411 #ifdef TARGET_WORDS_BIGENDIAN
 412     print_insn = print_insn_big_mips;
 413 #else
 414     print_insn = print_insn_little_mips;
 415 #endif
 416 #else
 417     term_printf("0x" TARGET_FMT_lx
 418                 ": Asm output not supported on this arch\n", pc);
 419     return;
 420 #endif
 421
 422     for(i = 0; i < nb_insn; i++) {
 423         term_printf("0x" TARGET_FMT_lx ":  ", pc);
 424         count = print_insn(pc, &disasm_info);
 425         term_printf("\n");
 426         if (count < 0)
 427             break;
 428         pc += count;
 429     }
 430 }
 431 #endif