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