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     cpu_memory_rw_debug(cpu_single_env, memaddr, myaddr, length, 0);
  37     return 0;
  38 }
  39
  40 /* Print an error message.  We can assume that this is in response to
  41    an error return from buffer_read_memory.  */
  42 void
  43 perror_memory (int status, bfd_vma memaddr, struct disassemble_info *info)
  44 {
  45   if (status != EIO)
  46     /* Can't happen.  */
  47     (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
  48   else
  49     /* Actually, address between memaddr and memaddr + len was
  50        out of bounds.  */
  51     (*info->fprintf_func) (info->stream,
  52                            "Address 0x%" PRIx64 " is out of bounds.\n", memaddr);
  53 }
  54
  55 /* This could be in a separate file, to save miniscule amounts of space
  56    in statically linked executables.  */
  57
  58 /* Just print the address is hex.  This is included for completeness even
  59    though both GDB and objdump provide their own (to print symbolic
  60    addresses).  */
  61
  62 void
  63 generic_print_address (bfd_vma addr, struct disassemble_info *info)
  64 {
  65     (*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);
  66 }
  67
  68 /* Just return the given address.  */
  69
  70 int
  71 generic_symbol_at_address (bfd_vma addr, struct disassemble_info *info)
  72 {
  73   return 1;
  74 }
  75
  76 bfd_vma bfd_getl64 (const bfd_byte *addr)
  77 {
  78   unsigned long long v;
  79
  80   v = (unsigned long long) addr[0];
  81   v |= (unsigned long long) addr[1] << 8;
  82   v |= (unsigned long long) addr[2] << 16;
  83   v |= (unsigned long long) addr[3] << 24;
  84   v |= (unsigned long long) addr[4] << 32;
  85   v |= (unsigned long long) addr[5] << 40;
  86   v |= (unsigned long long) addr[6] << 48;
  87   v |= (unsigned long long) addr[7] << 56;
  88   return (bfd_vma) v;
  89 }
  90
  91 bfd_vma bfd_getl32 (const bfd_byte *addr)
  92 {
  93   unsigned long v;
  94
  95   v = (unsigned long) addr[0];
  96   v |= (unsigned long) addr[1] << 8;
  97   v |= (unsigned long) addr[2] << 16;
  98   v |= (unsigned long) addr[3] << 24;
  99   return (bfd_vma) v;
 100 }
 101
 102 bfd_vma bfd_getb32 (const bfd_byte *addr)
 103 {
 104   unsigned long v;
 105
 106   v = (unsigned long) addr[0] << 24;
 107   v |= (unsigned long) addr[1] << 16;
 108   v |= (unsigned long) addr[2] << 8;
 109   v |= (unsigned long) addr[3];
 110   return (bfd_vma) v;
 111 }
 112
 113 bfd_vma bfd_getl16 (const bfd_byte *addr)
 114 {
 115   unsigned long v;
 116
 117   v = (unsigned long) addr[0];
 118   v |= (unsigned long) addr[1] << 8;
 119   return (bfd_vma) v;
 120 }
 121
 122 bfd_vma bfd_getb16 (const bfd_byte *addr)
 123 {
 124   unsigned long v;
 125
 126   v = (unsigned long) addr[0] << 24;
 127   v |= (unsigned long) addr[1] << 16;
 128   return (bfd_vma) v;
 129 }
 130
 131 #ifdef TARGET_ARM
 132 static int
 133 print_insn_thumb1(bfd_vma pc, disassemble_info *info)
 134 {
 135   return print_insn_arm(pc | 1, info);
 136 }
 137 #endif
 138
 139 /* Disassemble this for me please... (debugging). 'flags' has the following
 140    values:
 141     i386 - nonzero means 16 bit code
 142     arm  - nonzero means thumb code
 143     ppc  - nonzero means little endian
 144     other targets - unused
 145  */
 146 void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
 147 {
 148     target_ulong pc;
 149     int count;
 150     struct disassemble_info disasm_info;
 151     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 152
 153     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 154
 155     disasm_info.read_memory_func = target_read_memory;
 156     disasm_info.buffer_vma = code;
 157     disasm_info.buffer_length = size;
 158
 159 #ifdef TARGET_WORDS_BIGENDIAN
 160     disasm_info.endian = BFD_ENDIAN_BIG;
 161 #else
 162     disasm_info.endian = BFD_ENDIAN_LITTLE;
 163 #endif
 164 #if defined(TARGET_I386)
 165     if (flags == 2)
 166         disasm_info.mach = bfd_mach_x86_64;
 167     else if (flags == 1)
 168         disasm_info.mach = bfd_mach_i386_i8086;
 169     else
 170         disasm_info.mach = bfd_mach_i386_i386;
 171     print_insn = print_insn_i386;
 172 #elif defined(TARGET_ARM)
 173     if (flags)
 174         print_insn = print_insn_thumb1;
 175     else
 176         print_insn = print_insn_arm;
 177 #elif defined(TARGET_SPARC)
 178     print_insn = print_insn_sparc;
 179 #ifdef TARGET_SPARC64
 180     disasm_info.mach = bfd_mach_sparc_v9b;
 181 #endif
 182 #elif defined(TARGET_PPC)
 183     if (flags >> 16)
 184         disasm_info.endian = BFD_ENDIAN_LITTLE;
 185     if (flags & 0xFFFF) {
 186         /* If we have a precise definitions of the instructions set, use it */
 187         disasm_info.mach = flags & 0xFFFF;
 188     } else {
 189 #ifdef TARGET_PPC64
 190         disasm_info.mach = bfd_mach_ppc64;
 191 #else
 192         disasm_info.mach = bfd_mach_ppc;
 193 #endif
 194     }
 195     print_insn = print_insn_ppc;
 196 #elif defined(TARGET_M68K)
 197     print_insn = print_insn_m68k;
 198 #elif defined(TARGET_MIPS)
 199 #ifdef TARGET_WORDS_BIGENDIAN
 200     print_insn = print_insn_big_mips;
 201 #else
 202     print_insn = print_insn_little_mips;
 203 #endif
 204 #elif defined(TARGET_SH4)
 205     disasm_info.mach = bfd_mach_sh4;
 206     print_insn = print_insn_sh;
 207 #elif defined(TARGET_ALPHA)
 208     disasm_info.mach = bfd_mach_alpha;
 209     print_insn = print_insn_alpha;
 210 #elif defined(TARGET_CRIS)
 211     disasm_info.mach = bfd_mach_cris_v32;
 212     print_insn = print_insn_crisv32;
 213 #elif defined(TARGET_MICROBLAZE)
 214     disasm_info.mach = bfd_arch_microblaze;
 215     print_insn = print_insn_microblaze;
 216 #else
 217     fprintf(out, "0x" TARGET_FMT_lx
 218             ": Asm output not supported on this arch\n", code);
 219     return;
 220 #endif
 221
 222     for (pc = code; size > 0; pc += count, size -= count) {
 223         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 224         count = print_insn(pc, &disasm_info);
 225 #if 0
 226         {
 227             int i;
 228             uint8_t b;
 229             fprintf(out, " {");
 230             for(i = 0; i < count; i++) {
 231                 target_read_memory(pc + i, &b, 1, &disasm_info);
 232                 fprintf(out, " %02x", b);
 233             }
 234             fprintf(out, " }");
 235         }
 236 #endif
 237         fprintf(out, "\n");
 238         if (count < 0)
 239             break;
 240         if (size < count) {
 241             fprintf(out,
 242                     "Disassembler disagrees with translator over instruction "
 243                     "decoding\n"
 244                     "Please report this to qemu-devel@nongnu.org\n");
 245             break;
 246         }
 247     }
 248 }
 249
 250 /* Disassemble this for me please... (debugging). */
 251 void disas(FILE *out, void *code, unsigned long size)
 252 {
 253     unsigned long pc;
 254     int count;
 255     struct disassemble_info disasm_info;
 256     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 257
 258     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 259
 260     disasm_info.buffer = code;
 261     disasm_info.buffer_vma = (unsigned long)code;
 262     disasm_info.buffer_length = size;
 263
 264 #ifdef HOST_WORDS_BIGENDIAN
 265     disasm_info.endian = BFD_ENDIAN_BIG;
 266 #else
 267     disasm_info.endian = BFD_ENDIAN_LITTLE;
 268 #endif
 269 #if defined(__i386__)
 270     disasm_info.mach = bfd_mach_i386_i386;
 271     print_insn = print_insn_i386;
 272 #elif defined(__x86_64__)
 273     disasm_info.mach = bfd_mach_x86_64;
 274     print_insn = print_insn_i386;
 275 #elif defined(_ARCH_PPC)
 276     print_insn = print_insn_ppc;
 277 #elif defined(__alpha__)
 278     print_insn = print_insn_alpha;
 279 #elif defined(__sparc__)
 280     print_insn = print_insn_sparc;
 281 #if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
 282     disasm_info.mach = bfd_mach_sparc_v9b;
 283 #endif
 284 #elif defined(__arm__)
 285     print_insn = print_insn_arm;
 286 #elif defined(__MIPSEB__)
 287     print_insn = print_insn_big_mips;
 288 #elif defined(__MIPSEL__)
 289     print_insn = print_insn_little_mips;
 290 #elif defined(__m68k__)
 291     print_insn = print_insn_m68k;
 292 #elif defined(__s390__)
 293     print_insn = print_insn_s390;
 294 #elif defined(__hppa__)
 295     print_insn = print_insn_hppa;
 296 #elif defined(__ia64__)
 297     print_insn = print_insn_ia64;
 298 #else
 299     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 300             (long) code);
 301     return;
 302 #endif
 303     for (pc = (unsigned long)code; size > 0; pc += count, size -= count) {
 304         fprintf(out, "0x%08lx:  ", pc);
 305 #ifdef __arm__
 306         /* since data is included in the code, it is better to
 307            display code data too */
 308         fprintf(out, "%08x  ", (int)bfd_getl32((const bfd_byte *)pc));
 309 #endif
 310         count = print_insn(pc, &disasm_info);
 311         fprintf(out, "\n");
 312         if (count < 0)
 313             break;
 314     }
 315 }
 316
 317 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 318 const char *lookup_symbol(target_ulong orig_addr)
 319 {
 320     const char *symbol = "";
 321     struct syminfo *s;
 322
 323     for (s = syminfos; s; s = s->next) {
 324         symbol = s->lookup_symbol(s, orig_addr);
 325         if (symbol[0] != '\0') {
 326             break;
 327         }
 328     }
 329
 330     return symbol;
 331 }
 332
 333 #if !defined(CONFIG_USER_ONLY)
 334
 335 #include "monitor.h"
 336
 337 static int monitor_disas_is_physical;
 338 static CPUState *monitor_disas_env;
 339
 340 static int
 341 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 342                      struct disassemble_info *info)
 343 {
 344     if (monitor_disas_is_physical) {
 345         cpu_physical_memory_rw(memaddr, myaddr, length, 0);
 346     } else {
 347         cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
 348     }
 349     return 0;
 350 }
 351
 352 static int monitor_fprintf(FILE *stream, const char *fmt, ...)
 353 {
 354     va_list ap;
 355     va_start(ap, fmt);
 356     monitor_vprintf((Monitor *)stream, fmt, ap);
 357     va_end(ap);
 358     return 0;
 359 }
 360
 361 void monitor_disas(Monitor *mon, CPUState *env,
 362                    target_ulong pc, int nb_insn, int is_physical, int flags)
 363 {
 364     int count, i;
 365     struct disassemble_info disasm_info;
 366     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 367
 368     INIT_DISASSEMBLE_INFO(disasm_info, (FILE *)mon, monitor_fprintf);
 369
 370     monitor_disas_env = env;
 371     monitor_disas_is_physical = is_physical;
 372     disasm_info.read_memory_func = monitor_read_memory;
 373
 374     disasm_info.buffer_vma = pc;
 375
 376 #ifdef TARGET_WORDS_BIGENDIAN
 377     disasm_info.endian = BFD_ENDIAN_BIG;
 378 #else
 379     disasm_info.endian = BFD_ENDIAN_LITTLE;
 380 #endif
 381 #if defined(TARGET_I386)
 382     if (flags == 2)
 383         disasm_info.mach = bfd_mach_x86_64;
 384     else if (flags == 1)
 385         disasm_info.mach = bfd_mach_i386_i8086;
 386     else
 387         disasm_info.mach = bfd_mach_i386_i386;
 388     print_insn = print_insn_i386;
 389 #elif defined(TARGET_ARM)
 390     print_insn = print_insn_arm;
 391 #elif defined(TARGET_ALPHA)
 392     print_insn = print_insn_alpha;
 393 #elif defined(TARGET_SPARC)
 394     print_insn = print_insn_sparc;
 395 #ifdef TARGET_SPARC64
 396     disasm_info.mach = bfd_mach_sparc_v9b;
 397 #endif
 398 #elif defined(TARGET_PPC)
 399 #ifdef TARGET_PPC64
 400     disasm_info.mach = bfd_mach_ppc64;
 401 #else
 402     disasm_info.mach = bfd_mach_ppc;
 403 #endif
 404     print_insn = print_insn_ppc;
 405 #elif defined(TARGET_M68K)
 406     print_insn = print_insn_m68k;
 407 #elif defined(TARGET_MIPS)
 408 #ifdef TARGET_WORDS_BIGENDIAN
 409     print_insn = print_insn_big_mips;
 410 #else
 411     print_insn = print_insn_little_mips;
 412 #endif
 413 #elif defined(TARGET_SH4)
 414     disasm_info.mach = bfd_mach_sh4;
 415     print_insn = print_insn_sh;
 416 #else
 417     monitor_printf(mon, "0x" TARGET_FMT_lx
 418                    ": Asm output not supported on this arch\n", pc);
 419     return;
 420 #endif
 421
 422     for(i = 0; i < nb_insn; i++) {
 423         monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
 424         count = print_insn(pc, &disasm_info);
 425         monitor_printf(mon, "\n");
 426         if (count < 0)
 427             break;
 428         pc += count;
 429     }
 430 }
 431 #endif