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(bfd_vma memaddr, bfd_byte *myaddr, int length,
  18                    struct disassemble_info *info)
  19 {
  20     if (memaddr < info->buffer_vma
  21         || memaddr + length > info->buffer_vma + info->buffer_length)
  22         /* Out of bounds.  Use EIO because GDB uses it.  */
  23         return EIO;
  24     memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
  25     return 0;
  26 }
  27
  28 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  29    Transfer them to myaddr.  */
  30 static int
  31 target_read_memory (bfd_vma memaddr,
  32                     bfd_byte *myaddr,
  33                     int length,
  34                     struct disassemble_info *info)
  35 {
  36     int i;
  37     for(i = 0; i < length; i++) {
  38         myaddr[i] = ldub_code(memaddr + i);
  39     }
  40     return 0;
  41 }
  42
  43 /* Print an error message.  We can assume that this is in response to
  44    an error return from buffer_read_memory.  */
  45 void
  46 perror_memory (int status, bfd_vma memaddr, struct disassemble_info *info)
  47 {
  48   if (status != EIO)
  49     /* Can't happen.  */
  50     (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
  51   else
  52     /* Actually, address between memaddr and memaddr + len was
  53        out of bounds.  */
  54     (*info->fprintf_func) (info->stream,
  55                            "Address 0x%" PRIx64 " is out of bounds.\n", memaddr);
  56 }
  57
  58 /* This could be in a separate file, to save miniscule amounts of space
  59    in statically linked executables.  */
  60
  61 /* Just print the address is hex.  This is included for completeness even
  62    though both GDB and objdump provide their own (to print symbolic
  63    addresses).  */
  64
  65 void
  66 generic_print_address (bfd_vma addr, struct disassemble_info *info)
  67 {
  68     (*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);
  69 }
  70
  71 /* Just return the given address.  */
  72
  73 int
  74 generic_symbol_at_address (bfd_vma addr, struct disassemble_info *info)
  75 {
  76   return 1;
  77 }
  78
  79 bfd_vma bfd_getl32 (const bfd_byte *addr)
  80 {
  81   unsigned long v;
  82
  83   v = (unsigned long) addr[0];
  84   v |= (unsigned long) addr[1] << 8;
  85   v |= (unsigned long) addr[2] << 16;
  86   v |= (unsigned long) addr[3] << 24;
  87   return (bfd_vma) v;
  88 }
  89
  90 bfd_vma bfd_getb32 (const bfd_byte *addr)
  91 {
  92   unsigned long v;
  93
  94   v = (unsigned long) addr[0] << 24;
  95   v |= (unsigned long) addr[1] << 16;
  96   v |= (unsigned long) addr[2] << 8;
  97   v |= (unsigned long) addr[3];
  98   return (bfd_vma) v;
  99 }
 100
 101 bfd_vma bfd_getl16 (const bfd_byte *addr)
 102 {
 103   unsigned long v;
 104
 105   v = (unsigned long) addr[0];
 106   v |= (unsigned long) addr[1] << 8;
 107   return (bfd_vma) v;
 108 }
 109
 110 bfd_vma bfd_getb16 (const bfd_byte *addr)
 111 {
 112   unsigned long v;
 113
 114   v = (unsigned long) addr[0] << 24;
 115   v |= (unsigned long) addr[1] << 16;
 116   return (bfd_vma) v;
 117 }
 118
 119 #ifdef TARGET_ARM
 120 static int
 121 print_insn_thumb1(bfd_vma pc, disassemble_info *info)
 122 {
 123   return print_insn_arm(pc | 1, info);
 124 }
 125 #endif
 126
 127 /* Disassemble this for me please... (debugging). 'flags' has the following
 128    values:
 129     i386 - nonzero means 16 bit code
 130     arm  - nonzero means thumb code
 131     ppc  - nonzero means little endian
 132     other targets - unused
 133  */
 134 void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
 135 {
 136     target_ulong pc;
 137     int count;
 138     struct disassemble_info disasm_info;
 139     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 140
 141     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 142
 143     disasm_info.read_memory_func = target_read_memory;
 144     disasm_info.buffer_vma = code;
 145     disasm_info.buffer_length = size;
 146
 147 #ifdef TARGET_WORDS_BIGENDIAN
 148     disasm_info.endian = BFD_ENDIAN_BIG;
 149 #else
 150     disasm_info.endian = BFD_ENDIAN_LITTLE;
 151 #endif
 152 #if defined(TARGET_I386)
 153     if (flags == 2)
 154         disasm_info.mach = bfd_mach_x86_64;
 155     else if (flags == 1)
 156         disasm_info.mach = bfd_mach_i386_i8086;
 157     else
 158         disasm_info.mach = bfd_mach_i386_i386;
 159     print_insn = print_insn_i386;
 160 #elif defined(TARGET_ARM)
 161     if (flags)
 162         print_insn = print_insn_thumb1;
 163     else
 164         print_insn = print_insn_arm;
 165 #elif defined(TARGET_SPARC)
 166     print_insn = print_insn_sparc;
 167 #ifdef TARGET_SPARC64
 168     disasm_info.mach = bfd_mach_sparc_v9b;
 169 #endif
 170 #elif defined(TARGET_PPC)
 171     if (flags >> 16)
 172         disasm_info.endian = BFD_ENDIAN_LITTLE;
 173     if (flags & 0xFFFF) {
 174         /* If we have a precise definitions of the instructions set, use it */
 175         disasm_info.mach = flags & 0xFFFF;
 176     } else {
 177 #ifdef TARGET_PPC64
 178         disasm_info.mach = bfd_mach_ppc64;
 179 #else
 180         disasm_info.mach = bfd_mach_ppc;
 181 #endif
 182     }
 183     print_insn = print_insn_ppc;
 184 #elif defined(TARGET_M68K)
 185     print_insn = print_insn_m68k;
 186 #elif defined(TARGET_MIPS)
 187 #ifdef TARGET_WORDS_BIGENDIAN
 188     print_insn = print_insn_big_mips;
 189 #else
 190     print_insn = print_insn_little_mips;
 191 #endif
 192 #elif defined(TARGET_SH4)
 193     disasm_info.mach = bfd_mach_sh4;
 194     print_insn = print_insn_sh;
 195 #elif defined(TARGET_ALPHA)
 196     disasm_info.mach = bfd_mach_alpha;
 197     print_insn = print_insn_alpha;
 198 #elif defined(TARGET_CRIS)
 199     disasm_info.mach = bfd_mach_cris_v32;
 200     print_insn = print_insn_crisv32;
 201 #elif defined(TARGET_HPPA)
 202     disasm_info.mach = bfd_mach_hppa11;
 203     print_insn = print_insn_hppa;
 204 #else
 205     fprintf(out, "0x" TARGET_FMT_lx
 206             ": Asm output not supported on this arch\n", code);
 207     return;
 208 #endif
 209
 210     for (pc = code; size > 0; pc += count, size -= count) {
 211         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 212         count = print_insn(pc, &disasm_info);
 213 #if 0
 214         {
 215             int i;
 216             uint8_t b;
 217             fprintf(out, " {");
 218             for(i = 0; i < count; i++) {
 219                 target_read_memory(pc + i, &b, 1, &disasm_info);
 220                 fprintf(out, " %02x", b);
 221             }
 222             fprintf(out, " }");
 223         }
 224 #endif
 225         fprintf(out, "\n");
 226         if (count < 0)
 227             break;
 228         if (size < count) {
 229             fprintf(out,
 230                     "Disassembler disagrees with translator over instruction "
 231                     "decoding\n"
 232                     "Please report this to qemu-devel@nongnu.org\n");
 233             break;
 234         }
 235     }
 236 }
 237
 238 /* Disassemble this for me please... (debugging). */
 239 void disas(FILE *out, void *code, unsigned long size)
 240 {
 241     unsigned long pc;
 242     int count;
 243     struct disassemble_info disasm_info;
 244     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 245
 246     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 247
 248     disasm_info.buffer = code;
 249     disasm_info.buffer_vma = (unsigned long)code;
 250     disasm_info.buffer_length = size;
 251
 252 #ifdef WORDS_BIGENDIAN
 253     disasm_info.endian = BFD_ENDIAN_BIG;
 254 #else
 255     disasm_info.endian = BFD_ENDIAN_LITTLE;
 256 #endif
 257 #if defined(__i386__)
 258     disasm_info.mach = bfd_mach_i386_i386;
 259     print_insn = print_insn_i386;
 260 #elif defined(__x86_64__)
 261     disasm_info.mach = bfd_mach_x86_64;
 262     print_insn = print_insn_i386;
 263 #elif defined(_ARCH_PPC)
 264     print_insn = print_insn_ppc;
 265 #elif defined(__alpha__)
 266     print_insn = print_insn_alpha;
 267 #elif defined(__sparc__)
 268     print_insn = print_insn_sparc;
 269 #if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
 270     disasm_info.mach = bfd_mach_sparc_v9b;
 271 #endif
 272 #elif defined(__arm__)
 273     print_insn = print_insn_arm;
 274 #elif defined(__MIPSEB__)
 275     print_insn = print_insn_big_mips;
 276 #elif defined(__MIPSEL__)
 277     print_insn = print_insn_little_mips;
 278 #elif defined(__m68k__)
 279     print_insn = print_insn_m68k;
 280 #elif defined(__s390__)
 281     print_insn = print_insn_s390;
 282 #elif defined(__hppa__)
 283     print_insn = print_insn_hppa;
 284 #else
 285     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 286             (long) code);
 287     return;
 288 #endif
 289     for (pc = (unsigned long)code; size > 0; pc += count, size -= count) {
 290         fprintf(out, "0x%08lx:  ", pc);
 291 #ifdef __arm__
 292         /* since data is included in the code, it is better to
 293            display code data too */
 294         fprintf(out, "%08x  ", (int)bfd_getl32((const bfd_byte *)pc));
 295 #endif
 296         count = print_insn(pc, &disasm_info);
 297         fprintf(out, "\n");
 298         if (count < 0)
 299             break;
 300     }
 301 }
 302
 303 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 304 const char *lookup_symbol(target_ulong orig_addr)
 305 {
 306     const char *symbol = "";
 307     struct syminfo *s;
 308
 309     for (s = syminfos; s; s = s->next) {
 310         symbol = s->lookup_symbol(s, orig_addr);
 311         if (symbol[0] != '\0') {
 312             break;
 313         }
 314     }
 315
 316     return symbol;
 317 }
 318
 319 #if !defined(CONFIG_USER_ONLY)
 320
 321 #include "monitor.h"
 322
 323 static int monitor_disas_is_physical;
 324 static CPUState *monitor_disas_env;
 325
 326 static int
 327 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 328                      struct disassemble_info *info)
 329 {
 330     if (monitor_disas_is_physical) {
 331         cpu_physical_memory_rw(memaddr, myaddr, length, 0);
 332     } else {
 333         cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
 334     }
 335     return 0;
 336 }
 337
 338 static int monitor_fprintf(FILE *stream, const char *fmt, ...)
 339 {
 340     va_list ap;
 341     va_start(ap, fmt);
 342     monitor_vprintf((Monitor *)stream, fmt, ap);
 343     va_end(ap);
 344     return 0;
 345 }
 346
 347 void monitor_disas(Monitor *mon, CPUState *env,
 348                    target_ulong pc, int nb_insn, int is_physical, int flags)
 349 {
 350     int count, i;
 351     struct disassemble_info disasm_info;
 352     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 353
 354     INIT_DISASSEMBLE_INFO(disasm_info, (FILE *)mon, monitor_fprintf);
 355
 356     monitor_disas_env = env;
 357     monitor_disas_is_physical = is_physical;
 358     disasm_info.read_memory_func = monitor_read_memory;
 359
 360     disasm_info.buffer_vma = pc;
 361
 362 #ifdef TARGET_WORDS_BIGENDIAN
 363     disasm_info.endian = BFD_ENDIAN_BIG;
 364 #else
 365     disasm_info.endian = BFD_ENDIAN_LITTLE;
 366 #endif
 367 #if defined(TARGET_I386)
 368     if (flags == 2)
 369         disasm_info.mach = bfd_mach_x86_64;
 370     else if (flags == 1)
 371         disasm_info.mach = bfd_mach_i386_i8086;
 372     else
 373         disasm_info.mach = bfd_mach_i386_i386;
 374     print_insn = print_insn_i386;
 375 #elif defined(TARGET_ARM)
 376     print_insn = print_insn_arm;
 377 #elif defined(TARGET_ALPHA)
 378     print_insn = print_insn_alpha;
 379 #elif defined(TARGET_SPARC)
 380     print_insn = print_insn_sparc;
 381 #ifdef TARGET_SPARC64
 382     disasm_info.mach = bfd_mach_sparc_v9b;
 383 #endif
 384 #elif defined(TARGET_PPC)
 385 #ifdef TARGET_PPC64
 386     disasm_info.mach = bfd_mach_ppc64;
 387 #else
 388     disasm_info.mach = bfd_mach_ppc;
 389 #endif
 390     print_insn = print_insn_ppc;
 391 #elif defined(TARGET_M68K)
 392     print_insn = print_insn_m68k;
 393 #elif defined(TARGET_MIPS)
 394 #ifdef TARGET_WORDS_BIGENDIAN
 395     print_insn = print_insn_big_mips;
 396 #else
 397     print_insn = print_insn_little_mips;
 398 #endif
 399 #else
 400     monitor_printf(mon, "0x" TARGET_FMT_lx
 401                    ": Asm output not supported on this arch\n", pc);
 402     return;
 403 #endif
 404
 405     for(i = 0; i < nb_insn; i++) {
 406         monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
 407         count = print_insn(pc, &disasm_info);
 408         monitor_printf(mon, "\n");
 409         if (count < 0)
 410             break;
 411         pc += count;
 412     }
 413 }
 414 #endif