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 #else
 209     fprintf(out, "0x" TARGET_FMT_lx
 210             ": Asm output not supported on this arch\n", code);
 211     return;
 212 #endif
 213
 214     for (pc = code; pc < code + size; pc += count) {
 215         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 216         count = print_insn(pc, &disasm_info);
 217 #if 0
 218         {
 219             int i;
 220             uint8_t b;
 221             fprintf(out, " {");
 222             for(i = 0; i < count; i++) {
 223                 target_read_memory(pc + i, &b, 1, &disasm_info);
 224                 fprintf(out, " %02x", b);
 225             }
 226             fprintf(out, " }");
 227         }
 228 #endif
 229         fprintf(out, "\n");
 230         if (count < 0)
 231             break;
 232     }
 233 }
 234
 235 /* Disassemble this for me please... (debugging). */
 236 void disas(FILE *out, void *code, unsigned long size)
 237 {
 238     unsigned long pc;
 239     int count;
 240     struct disassemble_info disasm_info;
 241     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 242
 243     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 244
 245     disasm_info.buffer = code;
 246     disasm_info.buffer_vma = (unsigned long)code;
 247     disasm_info.buffer_length = size;
 248
 249 #ifdef WORDS_BIGENDIAN
 250     disasm_info.endian = BFD_ENDIAN_BIG;
 251 #else
 252     disasm_info.endian = BFD_ENDIAN_LITTLE;
 253 #endif
 254 #if defined(__i386__)
 255     disasm_info.mach = bfd_mach_i386_i386;
 256     print_insn = print_insn_i386;
 257 #elif defined(__x86_64__)
 258     disasm_info.mach = bfd_mach_x86_64;
 259     print_insn = print_insn_i386;
 260 #elif defined(__powerpc__)
 261     print_insn = print_insn_ppc;
 262 #elif defined(__alpha__)
 263     print_insn = print_insn_alpha;
 264 #elif defined(__sparc__)
 265     print_insn = print_insn_sparc;
 266 #if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
 267     disasm_info.mach = bfd_mach_sparc_v9b;
 268 #endif
 269 #elif defined(__arm__)
 270     print_insn = print_insn_arm;
 271 #elif defined(__MIPSEB__)
 272     print_insn = print_insn_big_mips;
 273 #elif defined(__MIPSEL__)
 274     print_insn = print_insn_little_mips;
 275 #elif defined(__m68k__)
 276     print_insn = print_insn_m68k;
 277 #elif defined(__s390__)
 278     print_insn = print_insn_s390;
 279 #else
 280     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 281             (long) code);
 282     return;
 283 #endif
 284     for (pc = (unsigned long)code; pc < (unsigned long)code + size; pc += count) {
 285         fprintf(out, "0x%08lx:  ", pc);
 286 #ifdef __arm__
 287         /* since data is included in the code, it is better to
 288            display code data too */
 289         fprintf(out, "%08x  ", (int)bfd_getl32((const bfd_byte *)pc));
 290 #endif
 291         count = print_insn(pc, &disasm_info);
 292         fprintf(out, "\n");
 293         if (count < 0)
 294             break;
 295     }
 296 }
 297
 298 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 299 const char *lookup_symbol(target_ulong orig_addr)
 300 {
 301     unsigned int i;
 302     /* Hack, because we know this is x86. */
 303     Elf32_Sym *sym;
 304     struct syminfo *s;
 305     target_ulong addr;
 306
 307     for (s = syminfos; s; s = s->next) {
 308         sym = s->disas_symtab;
 309         for (i = 0; i < s->disas_num_syms; i++) {
 310             if (sym[i].st_shndx == SHN_UNDEF
 311                 || sym[i].st_shndx >= SHN_LORESERVE)
 312                 continue;
 313
 314             if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
 315                 continue;
 316
 317             addr = sym[i].st_value;
 318 #if defined(TARGET_ARM) || defined (TARGET_MIPS)
 319             /* The bottom address bit marks a Thumb or MIPS16 symbol.  */
 320             addr &= ~(target_ulong)1;
 321 #endif
 322             if (orig_addr >= addr
 323                 && orig_addr < addr + sym[i].st_size)
 324                 return s->disas_strtab + sym[i].st_name;
 325         }
 326     }
 327     return "";
 328 }
 329
 330 #if !defined(CONFIG_USER_ONLY)
 331
 332 void term_vprintf(const char *fmt, va_list ap);
 333 void term_printf(const char *fmt, ...);
 334
 335 static int monitor_disas_is_physical;
 336 static CPUState *monitor_disas_env;
 337
 338 static int
 339 monitor_read_memory (memaddr, myaddr, length, info)
 340      bfd_vma memaddr;
 341      bfd_byte *myaddr;
 342      int length;
 343      struct disassemble_info *info;
 344 {
 345     if (monitor_disas_is_physical) {
 346         cpu_physical_memory_rw(memaddr, myaddr, length, 0);
 347     } else {
 348         cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
 349     }
 350     return 0;
 351 }
 352
 353 static int monitor_fprintf(FILE *stream, const char *fmt, ...)
 354 {
 355     va_list ap;
 356     va_start(ap, fmt);
 357     term_vprintf(fmt, ap);
 358     va_end(ap);
 359     return 0;
 360 }
 361
 362 void monitor_disas(CPUState *env,
 363                    target_ulong pc, int nb_insn, int is_physical, int flags)
 364 {
 365     int count, i;
 366     struct disassemble_info disasm_info;
 367     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 368
 369     INIT_DISASSEMBLE_INFO(disasm_info, NULL, monitor_fprintf);
 370
 371     monitor_disas_env = env;
 372     monitor_disas_is_physical = is_physical;
 373     disasm_info.read_memory_func = monitor_read_memory;
 374
 375     disasm_info.buffer_vma = pc;
 376
 377 #ifdef TARGET_WORDS_BIGENDIAN
 378     disasm_info.endian = BFD_ENDIAN_BIG;
 379 #else
 380     disasm_info.endian = BFD_ENDIAN_LITTLE;
 381 #endif
 382 #if defined(TARGET_I386)
 383     if (flags == 2)
 384         disasm_info.mach = bfd_mach_x86_64;
 385     else if (flags == 1)
 386         disasm_info.mach = bfd_mach_i386_i8086;
 387     else
 388         disasm_info.mach = bfd_mach_i386_i386;
 389     print_insn = print_insn_i386;
 390 #elif defined(TARGET_ARM)
 391     print_insn = print_insn_arm;
 392 #elif defined(TARGET_SPARC)
 393     print_insn = print_insn_sparc;
 394 #ifdef TARGET_SPARC64
 395     disasm_info.mach = bfd_mach_sparc_v9b;
 396 #endif
 397 #elif defined(TARGET_PPC)
 398 #ifdef TARGET_PPC64
 399     disasm_info.mach = bfd_mach_ppc64;
 400 #else
 401     disasm_info.mach = bfd_mach_ppc;
 402 #endif
 403     print_insn = print_insn_ppc;
 404 #elif defined(TARGET_M68K)
 405     print_insn = print_insn_m68k;
 406 #elif defined(TARGET_MIPS)
 407 #ifdef TARGET_WORDS_BIGENDIAN
 408     print_insn = print_insn_big_mips;
 409 #else
 410     print_insn = print_insn_little_mips;
 411 #endif
 412 #else
 413     term_printf("0x" TARGET_FMT_lx
 414                 ": Asm output not supported on this arch\n", pc);
 415     return;
 416 #endif
 417
 418     for(i = 0; i < nb_insn; i++) {
 419         term_printf("0x" TARGET_FMT_lx ":  ", pc);
 420         count = print_insn(pc, &disasm_info);
 421         term_printf("\n");
 422         if (count < 0)
 423             break;
 424         pc += count;
 425     }
 426 }
 427 #endif