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