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 #ifdef TARGET_ARM
 112 static int
 113 print_insn_thumb1(bfd_vma pc, disassemble_info *info)
 114 {
 115   return print_insn_arm(pc | 1, info);
 116 }
 117 #endif
 118
 119 /* Disassemble this for me please... (debugging). 'flags' has teh following
 120    values:
 121     i386 - nonzero means 16 bit code
 122     arm  - nonzero means thumb code
 123     other targets - unused
 124  */
 125 void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
 126 {
 127     target_ulong pc;
 128     int count;
 129     struct disassemble_info disasm_info;
 130     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 131
 132     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 133
 134     disasm_info.read_memory_func = target_read_memory;
 135     disasm_info.buffer_vma = code;
 136     disasm_info.buffer_length = size;
 137
 138 #ifdef TARGET_WORDS_BIGENDIAN
 139     disasm_info.endian = BFD_ENDIAN_BIG;
 140 #else
 141     disasm_info.endian = BFD_ENDIAN_LITTLE;
 142 #endif
 143 #if defined(TARGET_I386)
 144     if (flags == 2)
 145         disasm_info.mach = bfd_mach_x86_64;
 146     else if (flags == 1)
 147         disasm_info.mach = bfd_mach_i386_i8086;
 148     else
 149         disasm_info.mach = bfd_mach_i386_i386;
 150     print_insn = print_insn_i386;
 151 #elif defined(TARGET_ARM)
 152     if (flags)
 153         print_insn = print_insn_thumb1;
 154     else
 155         print_insn = print_insn_arm;
 156 #elif defined(TARGET_SPARC)
 157     print_insn = print_insn_sparc;
 158 #elif defined(TARGET_PPC)
 159     if (cpu_single_env->msr[MSR_LE])
 160         disasm_info.endian = BFD_ENDIAN_LITTLE;
 161     print_insn = print_insn_ppc;
 162 #else
 163     fprintf(out, "0x" TARGET_FMT_lx
 164             ": Asm output not supported on this arch\n", code);
 165     return;
 166 #endif
 167
 168     for (pc = code; pc < code + size; pc += count) {
 169         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 170         count = print_insn(pc, &disasm_info);
 171 #if 0
 172         {
 173             int i;
 174             uint8_t b;
 175             fprintf(out, " {");
 176             for(i = 0; i < count; i++) {
 177                 target_read_memory(pc + i, &b, 1, &disasm_info);
 178                 fprintf(out, " %02x", b);
 179             }
 180             fprintf(out, " }");
 181         }
 182 #endif
 183         fprintf(out, "\n");
 184         if (count < 0)
 185             break;
 186     }
 187 }
 188
 189 /* Disassemble this for me please... (debugging). */
 190 void disas(FILE *out, void *code, unsigned long size)
 191 {
 192     unsigned long pc;
 193     int count;
 194     struct disassemble_info disasm_info;
 195     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 196
 197     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 198
 199     disasm_info.buffer = code;
 200     disasm_info.buffer_vma = (unsigned long)code;
 201     disasm_info.buffer_length = size;
 202
 203 #ifdef WORDS_BIGENDIAN
 204     disasm_info.endian = BFD_ENDIAN_BIG;
 205 #else
 206     disasm_info.endian = BFD_ENDIAN_LITTLE;
 207 #endif
 208 #if defined(__i386__)
 209     disasm_info.mach = bfd_mach_i386_i386;
 210     print_insn = print_insn_i386;
 211 #elif defined(__x86_64__)
 212     disasm_info.mach = bfd_mach_x86_64;
 213     print_insn = print_insn_i386;
 214 #elif defined(__powerpc__)
 215     print_insn = print_insn_ppc;
 216 #elif defined(__alpha__)
 217     print_insn = print_insn_alpha;
 218 #elif defined(__sparc__)
 219     print_insn = print_insn_sparc;
 220 #elif defined(__arm__)
 221     print_insn = print_insn_arm;
 222 #else
 223     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 224             (long) code);
 225     return;
 226 #endif
 227     for (pc = (unsigned long)code; pc < (unsigned long)code + size; pc += count) {
 228         fprintf(out, "0x%08lx:  ", pc);
 229 #ifdef __arm__
 230         /* since data are included in the code, it is better to
 231            display code data too */
 232         if (is_host) {
 233             fprintf(out, "%08x  ", (int)bfd_getl32((const bfd_byte *)pc));
 234         }
 235 #endif
 236         count = print_insn(pc, &disasm_info);
 237         fprintf(out, "\n");
 238         if (count < 0)
 239             break;
 240     }
 241 }
 242
 243 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 244 const char *lookup_symbol(target_ulong orig_addr)
 245 {
 246     unsigned int i;
 247     /* Hack, because we know this is x86. */
 248     Elf32_Sym *sym;
 249     struct syminfo *s;
 250
 251     for (s = syminfos; s; s = s->next) {
 252         sym = s->disas_symtab;
 253         for (i = 0; i < s->disas_num_syms; i++) {
 254             if (sym[i].st_shndx == SHN_UNDEF
 255                 || sym[i].st_shndx >= SHN_LORESERVE)
 256                 continue;
 257
 258             if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
 259                 continue;
 260
 261             if (orig_addr >= sym[i].st_value
 262                 && orig_addr < sym[i].st_value + sym[i].st_size)
 263                 return s->disas_strtab + sym[i].st_name;
 264         }
 265     }
 266     return "";
 267 }
 268
 269 #if !defined(CONFIG_USER_ONLY)
 270
 271 void term_vprintf(const char *fmt, va_list ap);
 272 void term_printf(const char *fmt, ...);
 273
 274 static int monitor_disas_is_physical;
 275
 276 static int
 277 monitor_read_memory (memaddr, myaddr, length, info)
 278      bfd_vma memaddr;
 279      bfd_byte *myaddr;
 280      int length;
 281      struct disassemble_info *info;
 282 {
 283     if (monitor_disas_is_physical) {
 284         cpu_physical_memory_rw(memaddr, myaddr, length, 0);
 285     } else {
 286         cpu_memory_rw_debug(cpu_single_env, memaddr,myaddr, length, 0);
 287     }
 288     return 0;
 289 }
 290
 291 static int monitor_fprintf(FILE *stream, const char *fmt, ...)
 292 {
 293     va_list ap;
 294     va_start(ap, fmt);
 295     term_vprintf(fmt, ap);
 296     va_end(ap);
 297     return 0;
 298 }
 299
 300 void monitor_disas(target_ulong pc, int nb_insn, int is_physical, int flags)
 301 {
 302     int count, i;
 303     struct disassemble_info disasm_info;
 304     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 305
 306     INIT_DISASSEMBLE_INFO(disasm_info, NULL, monitor_fprintf);
 307
 308     monitor_disas_is_physical = is_physical;
 309     disasm_info.read_memory_func = monitor_read_memory;
 310
 311     disasm_info.buffer_vma = pc;
 312
 313 #ifdef TARGET_WORDS_BIGENDIAN
 314     disasm_info.endian = BFD_ENDIAN_BIG;
 315 #else
 316     disasm_info.endian = BFD_ENDIAN_LITTLE;
 317 #endif
 318 #if defined(TARGET_I386)
 319     if (flags == 2)
 320         disasm_info.mach = bfd_mach_x86_64;
 321     else if (flags == 1)
 322         disasm_info.mach = bfd_mach_i386_i8086;
 323     else
 324         disasm_info.mach = bfd_mach_i386_i386;
 325     print_insn = print_insn_i386;
 326 #elif defined(TARGET_ARM)
 327     print_insn = print_insn_arm;
 328 #elif defined(TARGET_SPARC)
 329     print_insn = print_insn_sparc;
 330 #elif defined(TARGET_PPC)
 331     print_insn = print_insn_ppc;
 332 #else
 333     term_printf("0x" TARGET_FMT_lx
 334                 ": Asm output not supported on this arch\n", pc);
 335     return;
 336 #endif
 337
 338     for(i = 0; i < nb_insn; i++) {
 339         term_printf("0x" TARGET_FMT_lx ":  ", pc);
 340         count = print_insn(pc, &disasm_info);
 341         term_printf("\n");
 342         if (count < 0)
 343             break;
 344         pc += count;
 345     }
 346 }
 347 #endif