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