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%llx 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%llx", 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 teh following
 138    values:
 139     i386 - nonzero means 16 bit code
 140     arm  - nonzero means thumb code
 141     other targets - unused
 142  */
 143 void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
 144 {
 145     target_ulong pc;
 146     int count;
 147     struct disassemble_info disasm_info;
 148     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 149
 150     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 151
 152     disasm_info.read_memory_func = target_read_memory;
 153     disasm_info.buffer_vma = code;
 154     disasm_info.buffer_length = size;
 155
 156 #ifdef TARGET_WORDS_BIGENDIAN
 157     disasm_info.endian = BFD_ENDIAN_BIG;
 158 #else
 159     disasm_info.endian = BFD_ENDIAN_LITTLE;
 160 #endif
 161 #if defined(TARGET_I386)
 162     if (flags == 2)
 163         disasm_info.mach = bfd_mach_x86_64;
 164     else if (flags == 1)
 165         disasm_info.mach = bfd_mach_i386_i8086;
 166     else
 167         disasm_info.mach = bfd_mach_i386_i386;
 168     print_insn = print_insn_i386;
 169 #elif defined(TARGET_ARM)
 170     if (flags)
 171         print_insn = print_insn_thumb1;
 172     else
 173         print_insn = print_insn_arm;
 174 #elif defined(TARGET_SPARC)
 175     print_insn = print_insn_sparc;
 176 #ifdef TARGET_SPARC64
 177     disasm_info.mach = bfd_mach_sparc_v9b;
 178 #endif
 179 #elif defined(TARGET_PPC)
 180     if (cpu_single_env->msr[MSR_LE])
 181         disasm_info.endian = BFD_ENDIAN_LITTLE;
 182     print_insn = print_insn_ppc;
 183 #elif defined(TARGET_MIPS)
 184     print_insn = print_insn_big_mips;
 185 #else
 186     fprintf(out, "0x" TARGET_FMT_lx
 187             ": Asm output not supported on this arch\n", code);
 188     return;
 189 #endif
 190
 191     for (pc = code; pc < code + size; pc += count) {
 192         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 193         count = print_insn(pc, &disasm_info);
 194 #if 0
 195         {
 196             int i;
 197             uint8_t b;
 198             fprintf(out, " {");
 199             for(i = 0; i < count; i++) {
 200                 target_read_memory(pc + i, &b, 1, &disasm_info);
 201                 fprintf(out, " %02x", b);
 202             }
 203             fprintf(out, " }");
 204         }
 205 #endif
 206         fprintf(out, "\n");
 207         if (count < 0)
 208             break;
 209     }
 210 }
 211
 212 /* Disassemble this for me please... (debugging). */
 213 void disas(FILE *out, void *code, unsigned long size)
 214 {
 215     unsigned long pc;
 216     int count;
 217     struct disassemble_info disasm_info;
 218     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 219
 220     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 221
 222     disasm_info.buffer = code;
 223     disasm_info.buffer_vma = (unsigned long)code;
 224     disasm_info.buffer_length = size;
 225
 226 #ifdef WORDS_BIGENDIAN
 227     disasm_info.endian = BFD_ENDIAN_BIG;
 228 #else
 229     disasm_info.endian = BFD_ENDIAN_LITTLE;
 230 #endif
 231 #if defined(__i386__)
 232     disasm_info.mach = bfd_mach_i386_i386;
 233     print_insn = print_insn_i386;
 234 #elif defined(__x86_64__)
 235     disasm_info.mach = bfd_mach_x86_64;
 236     print_insn = print_insn_i386;
 237 #elif defined(__powerpc__)
 238     print_insn = print_insn_ppc;
 239 #elif defined(__alpha__)
 240     print_insn = print_insn_alpha;
 241 #elif defined(__sparc__)
 242     print_insn = print_insn_sparc;
 243 #elif defined(__arm__)
 244     print_insn = print_insn_arm;
 245 #elif defined(__MIPSEB__)
 246     print_insn = print_insn_big_mips;
 247 #elif defined(__MIPSEL__)
 248     print_insn = print_insn_little_mips;
 249 #else
 250     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 251             (long) code);
 252     return;
 253 #endif
 254     for (pc = (unsigned long)code; pc < (unsigned long)code + size; pc += count) {
 255         fprintf(out, "0x%08lx:  ", pc);
 256 #ifdef __arm__
 257         /* since data are included in the code, it is better to
 258            display code data too */
 259         if (is_host) {
 260             fprintf(out, "%08x  ", (int)bfd_getl32((const bfd_byte *)pc));
 261         }
 262 #endif
 263         count = print_insn(pc, &disasm_info);
 264         fprintf(out, "\n");
 265         if (count < 0)
 266             break;
 267     }
 268 }
 269
 270 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 271 const char *lookup_symbol(target_ulong orig_addr)
 272 {
 273     unsigned int i;
 274     /* Hack, because we know this is x86. */
 275     Elf32_Sym *sym;
 276     struct syminfo *s;
 277
 278     for (s = syminfos; s; s = s->next) {
 279         sym = s->disas_symtab;
 280         for (i = 0; i < s->disas_num_syms; i++) {
 281             if (sym[i].st_shndx == SHN_UNDEF
 282                 || sym[i].st_shndx >= SHN_LORESERVE)
 283                 continue;
 284
 285             if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
 286                 continue;
 287
 288             if (orig_addr >= sym[i].st_value
 289                 && orig_addr < sym[i].st_value + sym[i].st_size)
 290                 return s->disas_strtab + sym[i].st_name;
 291         }
 292     }
 293     return "";
 294 }
 295
 296 #if !defined(CONFIG_USER_ONLY)
 297
 298 void term_vprintf(const char *fmt, va_list ap);
 299 void term_printf(const char *fmt, ...);
 300
 301 static int monitor_disas_is_physical;
 302
 303 static int
 304 monitor_read_memory (memaddr, myaddr, length, info)
 305      bfd_vma memaddr;
 306      bfd_byte *myaddr;
 307      int length;
 308      struct disassemble_info *info;
 309 {
 310     if (monitor_disas_is_physical) {
 311         cpu_physical_memory_rw(memaddr, myaddr, length, 0);
 312     } else {
 313         cpu_memory_rw_debug(cpu_single_env, memaddr,myaddr, length, 0);
 314     }
 315     return 0;
 316 }
 317
 318 static int monitor_fprintf(FILE *stream, const char *fmt, ...)
 319 {
 320     va_list ap;
 321     va_start(ap, fmt);
 322     term_vprintf(fmt, ap);
 323     va_end(ap);
 324     return 0;
 325 }
 326
 327 void monitor_disas(target_ulong pc, int nb_insn, int is_physical, int flags)
 328 {
 329     int count, i;
 330     struct disassemble_info disasm_info;
 331     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 332
 333     INIT_DISASSEMBLE_INFO(disasm_info, NULL, monitor_fprintf);
 334
 335     monitor_disas_is_physical = is_physical;
 336     disasm_info.read_memory_func = monitor_read_memory;
 337
 338     disasm_info.buffer_vma = pc;
 339
 340 #ifdef TARGET_WORDS_BIGENDIAN
 341     disasm_info.endian = BFD_ENDIAN_BIG;
 342 #else
 343     disasm_info.endian = BFD_ENDIAN_LITTLE;
 344 #endif
 345 #if defined(TARGET_I386)
 346     if (flags == 2)
 347         disasm_info.mach = bfd_mach_x86_64;
 348     else if (flags == 1)
 349         disasm_info.mach = bfd_mach_i386_i8086;
 350     else
 351         disasm_info.mach = bfd_mach_i386_i386;
 352     print_insn = print_insn_i386;
 353 #elif defined(TARGET_ARM)
 354     print_insn = print_insn_arm;
 355 #elif defined(TARGET_SPARC)
 356     print_insn = print_insn_sparc;
 357 #elif defined(TARGET_PPC)
 358     print_insn = print_insn_ppc;
 359 #elif defined(TARGET_MIPS)
 360     print_insn = print_insn_big_mips;
 361 #else
 362     term_printf("0x" TARGET_FMT_lx
 363                 ": Asm output not supported on this arch\n", pc);
 364     return;
 365 #endif
 366
 367     for(i = 0; i < nb_insn; i++) {
 368         term_printf("0x" TARGET_FMT_lx ":  ", pc);
 369         count = print_insn(pc, &disasm_info);
 370         term_printf("\n");
 371         if (count < 0)
 372             break;
 373         pc += count;
 374     }
 375 }
 376 #endif