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 #ifdef TARGET_PPC64
 183     disasm_info.mach = bfd_mach_ppc64;
 184 #else
 185     disasm_info.mach = bfd_mach_ppc;
 186 #endif
 187     print_insn = print_insn_ppc;
 188 #elif defined(TARGET_MIPS)
 189     print_insn = print_insn_big_mips;
 190 #elif defined(TARGET_M68K)
 191     print_insn = print_insn_m68k;
 192 #else
 193     fprintf(out, "0x" TARGET_FMT_lx
 194             ": Asm output not supported on this arch\n", code);
 195     return;
 196 #endif
 197
 198     for (pc = code; pc < code + size; pc += count) {
 199         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 200         count = print_insn(pc, &disasm_info);
 201 #if 0
 202         {
 203             int i;
 204             uint8_t b;
 205             fprintf(out, " {");
 206             for(i = 0; i < count; i++) {
 207                 target_read_memory(pc + i, &b, 1, &disasm_info);
 208                 fprintf(out, " %02x", b);
 209             }
 210             fprintf(out, " }");
 211         }
 212 #endif
 213         fprintf(out, "\n");
 214         if (count < 0)
 215             break;
 216     }
 217 }
 218
 219 /* Disassemble this for me please... (debugging). */
 220 void disas(FILE *out, void *code, unsigned long size)
 221 {
 222     unsigned long pc;
 223     int count;
 224     struct disassemble_info disasm_info;
 225     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 226
 227     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 228
 229     disasm_info.buffer = code;
 230     disasm_info.buffer_vma = (unsigned long)code;
 231     disasm_info.buffer_length = size;
 232
 233 #ifdef WORDS_BIGENDIAN
 234     disasm_info.endian = BFD_ENDIAN_BIG;
 235 #else
 236     disasm_info.endian = BFD_ENDIAN_LITTLE;
 237 #endif
 238 #if defined(__i386__)
 239     disasm_info.mach = bfd_mach_i386_i386;
 240     print_insn = print_insn_i386;
 241 #elif defined(__x86_64__)
 242     disasm_info.mach = bfd_mach_x86_64;
 243     print_insn = print_insn_i386;
 244 #elif defined(__powerpc__)
 245     print_insn = print_insn_ppc;
 246 #elif defined(__alpha__)
 247     print_insn = print_insn_alpha;
 248 #elif defined(__sparc__)
 249     print_insn = print_insn_sparc;
 250 #elif defined(__arm__)
 251     print_insn = print_insn_arm;
 252 #elif defined(__MIPSEB__)
 253     print_insn = print_insn_big_mips;
 254 #elif defined(__MIPSEL__)
 255     print_insn = print_insn_little_mips;
 256 #elif defined(__m68k__)
 257     print_insn = print_insn_m68k;
 258 #else
 259     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 260             (long) code);
 261     return;
 262 #endif
 263     for (pc = (unsigned long)code; pc < (unsigned long)code + size; pc += count) {
 264         fprintf(out, "0x%08lx:  ", pc);
 265 #ifdef __arm__
 266         /* since data are included in the code, it is better to
 267            display code data too */
 268         if (is_host) {
 269             fprintf(out, "%08x  ", (int)bfd_getl32((const bfd_byte *)pc));
 270         }
 271 #endif
 272         count = print_insn(pc, &disasm_info);
 273         fprintf(out, "\n");
 274         if (count < 0)
 275             break;
 276     }
 277 }
 278
 279 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 280 const char *lookup_symbol(target_ulong orig_addr)
 281 {
 282     unsigned int i;
 283     /* Hack, because we know this is x86. */
 284     Elf32_Sym *sym;
 285     struct syminfo *s;
 286     target_ulong addr;
 287
 288     for (s = syminfos; s; s = s->next) {
 289         sym = s->disas_symtab;
 290         for (i = 0; i < s->disas_num_syms; i++) {
 291             if (sym[i].st_shndx == SHN_UNDEF
 292                 || sym[i].st_shndx >= SHN_LORESERVE)
 293                 continue;
 294
 295             if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
 296                 continue;
 297
 298             addr = sym[i].st_value;
 299 #ifdef TARGET_ARM
 300             /* The bottom address bit marks a Thumb symbol.  */
 301             addr &= ~(target_ulong)1;
 302 #endif
 303             if (orig_addr >= addr
 304                 && orig_addr < addr + sym[i].st_size)
 305                 return s->disas_strtab + sym[i].st_name;
 306         }
 307     }
 308     return "";
 309 }
 310
 311 #if !defined(CONFIG_USER_ONLY)
 312
 313 void term_vprintf(const char *fmt, va_list ap);
 314 void term_printf(const char *fmt, ...);
 315
 316 static int monitor_disas_is_physical;
 317
 318 static int
 319 monitor_read_memory (memaddr, myaddr, length, info)
 320      bfd_vma memaddr;
 321      bfd_byte *myaddr;
 322      int length;
 323      struct disassemble_info *info;
 324 {
 325     if (monitor_disas_is_physical) {
 326         cpu_physical_memory_rw(memaddr, myaddr, length, 0);
 327     } else {
 328         cpu_memory_rw_debug(cpu_single_env, memaddr,myaddr, length, 0);
 329     }
 330     return 0;
 331 }
 332
 333 static int monitor_fprintf(FILE *stream, const char *fmt, ...)
 334 {
 335     va_list ap;
 336     va_start(ap, fmt);
 337     term_vprintf(fmt, ap);
 338     va_end(ap);
 339     return 0;
 340 }
 341
 342 void monitor_disas(target_ulong pc, int nb_insn, int is_physical, int flags)
 343 {
 344     int count, i;
 345     struct disassemble_info disasm_info;
 346     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 347
 348     INIT_DISASSEMBLE_INFO(disasm_info, NULL, monitor_fprintf);
 349
 350     monitor_disas_is_physical = is_physical;
 351     disasm_info.read_memory_func = monitor_read_memory;
 352
 353     disasm_info.buffer_vma = pc;
 354
 355 #ifdef TARGET_WORDS_BIGENDIAN
 356     disasm_info.endian = BFD_ENDIAN_BIG;
 357 #else
 358     disasm_info.endian = BFD_ENDIAN_LITTLE;
 359 #endif
 360 #if defined(TARGET_I386)
 361     if (flags == 2)
 362         disasm_info.mach = bfd_mach_x86_64;
 363     else if (flags == 1)
 364         disasm_info.mach = bfd_mach_i386_i8086;
 365     else
 366         disasm_info.mach = bfd_mach_i386_i386;
 367     print_insn = print_insn_i386;
 368 #elif defined(TARGET_ARM)
 369     print_insn = print_insn_arm;
 370 #elif defined(TARGET_SPARC)
 371     print_insn = print_insn_sparc;
 372 #elif defined(TARGET_PPC)
 373 #ifdef TARGET_PPC64
 374     disasm_info.mach = bfd_mach_ppc64;
 375 #else
 376     disasm_info.mach = bfd_mach_ppc;
 377 #endif
 378     print_insn = print_insn_ppc;
 379 #elif defined(TARGET_MIPS)
 380     print_insn = print_insn_big_mips;
 381 #elif defined(TARGET_M68K)
 382     print_insn = print_insn_m68k;
 383 #else
 384     term_printf("0x" TARGET_FMT_lx
 385                 ": Asm output not supported on this arch\n", pc);
 386     return;
 387 #endif
 388
 389     for(i = 0; i < nb_insn; i++) {
 390         term_printf("0x" TARGET_FMT_lx ":  ", pc);
 391         count = print_insn(pc, &disasm_info);
 392         term_printf("\n");
 393         if (count < 0)
 394             break;
 395         pc += count;
 396     }
 397 }
 398 #endif