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 "disas.h"
   9
  10 /* Filled in by elfload.c.  Simplistic, but will do for now. */
  11 struct syminfo *syminfos = NULL;
  12
  13 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  14    Transfer them to myaddr.  */
  15 int
  16 buffer_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
  17                    struct disassemble_info *info)
  18 {
  19     if (memaddr < info->buffer_vma
  20         || memaddr + length > info->buffer_vma + info->buffer_length)
  21         /* Out of bounds.  Use EIO because GDB uses it.  */
  22         return EIO;
  23     memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
  24     return 0;
  25 }
  26
  27 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  28    Transfer them to myaddr.  */
  29 static int
  30 target_read_memory (bfd_vma memaddr,
  31                     bfd_byte *myaddr,
  32                     int length,
  33                     struct disassemble_info *info)
  34 {
  35     cpu_memory_rw_debug(cpu_single_env, memaddr, myaddr, length, 0);
  36     return 0;
  37 }
  38
  39 /* Print an error message.  We can assume that this is in response to
  40    an error return from buffer_read_memory.  */
  41 void
  42 perror_memory (int status, bfd_vma memaddr, struct disassemble_info *info)
  43 {
  44   if (status != EIO)
  45     /* Can't happen.  */
  46     (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
  47   else
  48     /* Actually, address between memaddr and memaddr + len was
  49        out of bounds.  */
  50     (*info->fprintf_func) (info->stream,
  51                            "Address 0x%" PRIx64 " is out of bounds.\n", memaddr);
  52 }
  53
  54 /* This could be in a separate file, to save miniscule amounts of space
  55    in statically linked executables.  */
  56
  57 /* Just print the address is hex.  This is included for completeness even
  58    though both GDB and objdump provide their own (to print symbolic
  59    addresses).  */
  60
  61 void
  62 generic_print_address (bfd_vma addr, struct disassemble_info *info)
  63 {
  64     (*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);
  65 }
  66
  67 /* Just return the given address.  */
  68
  69 int
  70 generic_symbol_at_address (bfd_vma addr, struct disassemble_info *info)
  71 {
  72   return 1;
  73 }
  74
  75 bfd_vma bfd_getl64 (const bfd_byte *addr)
  76 {
  77   unsigned long long v;
  78
  79   v = (unsigned long long) addr[0];
  80   v |= (unsigned long long) addr[1] << 8;
  81   v |= (unsigned long long) addr[2] << 16;
  82   v |= (unsigned long long) addr[3] << 24;
  83   v |= (unsigned long long) addr[4] << 32;
  84   v |= (unsigned long long) addr[5] << 40;
  85   v |= (unsigned long long) addr[6] << 48;
  86   v |= (unsigned long long) addr[7] << 56;
  87   return (bfd_vma) v;
  88 }
  89
  90 bfd_vma bfd_getl32 (const bfd_byte *addr)
  91 {
  92   unsigned long v;
  93
  94   v = (unsigned long) addr[0];
  95   v |= (unsigned long) addr[1] << 8;
  96   v |= (unsigned long) addr[2] << 16;
  97   v |= (unsigned long) addr[3] << 24;
  98   return (bfd_vma) v;
  99 }
 100
 101 bfd_vma bfd_getb32 (const bfd_byte *addr)
 102 {
 103   unsigned long v;
 104
 105   v = (unsigned long) addr[0] << 24;
 106   v |= (unsigned long) addr[1] << 16;
 107   v |= (unsigned long) addr[2] << 8;
 108   v |= (unsigned long) addr[3];
 109   return (bfd_vma) v;
 110 }
 111
 112 bfd_vma bfd_getl16 (const bfd_byte *addr)
 113 {
 114   unsigned long v;
 115
 116   v = (unsigned long) addr[0];
 117   v |= (unsigned long) addr[1] << 8;
 118   return (bfd_vma) v;
 119 }
 120
 121 bfd_vma bfd_getb16 (const bfd_byte *addr)
 122 {
 123   unsigned long v;
 124
 125   v = (unsigned long) addr[0] << 24;
 126   v |= (unsigned long) addr[1] << 16;
 127   return (bfd_vma) v;
 128 }
 129
 130 #ifdef TARGET_ARM
 131 static int
 132 print_insn_thumb1(bfd_vma pc, disassemble_info *info)
 133 {
 134   return print_insn_arm(pc | 1, info);
 135 }
 136 #endif
 137
 138 /* Disassemble this for me please... (debugging). 'flags' has the following
 139    values:
 140     i386 - 1 means 16 bit code, 2 means 64 bit code
 141     arm  - nonzero means thumb code
 142     ppc  - nonzero means little endian
 143     other targets - unused
 144  */
 145 void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
 146 {
 147     target_ulong pc;
 148     int count;
 149     struct disassemble_info disasm_info;
 150     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 151
 152     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 153
 154     disasm_info.read_memory_func = target_read_memory;
 155     disasm_info.buffer_vma = code;
 156     disasm_info.buffer_length = size;
 157
 158 #ifdef TARGET_WORDS_BIGENDIAN
 159     disasm_info.endian = BFD_ENDIAN_BIG;
 160 #else
 161     disasm_info.endian = BFD_ENDIAN_LITTLE;
 162 #endif
 163 #if defined(TARGET_I386)
 164     if (flags == 2)
 165         disasm_info.mach = bfd_mach_x86_64;
 166     else if (flags == 1)
 167         disasm_info.mach = bfd_mach_i386_i8086;
 168     else
 169         disasm_info.mach = bfd_mach_i386_i386;
 170     print_insn = print_insn_i386;
 171 #elif defined(TARGET_ARM)
 172     if (flags)
 173         print_insn = print_insn_thumb1;
 174     else
 175         print_insn = print_insn_arm;
 176 #elif defined(TARGET_SPARC)
 177     print_insn = print_insn_sparc;
 178 #ifdef TARGET_SPARC64
 179     disasm_info.mach = bfd_mach_sparc_v9b;
 180 #endif
 181 #elif defined(TARGET_PPC)
 182     if (flags >> 16)
 183         disasm_info.endian = BFD_ENDIAN_LITTLE;
 184     if (flags & 0xFFFF) {
 185         /* If we have a precise definitions of the instructions set, use it */
 186         disasm_info.mach = flags & 0xFFFF;
 187     } else {
 188 #ifdef TARGET_PPC64
 189         disasm_info.mach = bfd_mach_ppc64;
 190 #else
 191         disasm_info.mach = bfd_mach_ppc;
 192 #endif
 193     }
 194     print_insn = print_insn_ppc;
 195 #elif defined(TARGET_M68K)
 196     print_insn = print_insn_m68k;
 197 #elif defined(TARGET_MIPS)
 198 #ifdef TARGET_WORDS_BIGENDIAN
 199     print_insn = print_insn_big_mips;
 200 #else
 201     print_insn = print_insn_little_mips;
 202 #endif
 203 #elif defined(TARGET_SH4)
 204     disasm_info.mach = bfd_mach_sh4;
 205     print_insn = print_insn_sh;
 206 #elif defined(TARGET_ALPHA)
 207     disasm_info.mach = bfd_mach_alpha_ev6;
 208     print_insn = print_insn_alpha;
 209 #elif defined(TARGET_CRIS)
 210     if (flags != 32) {
 211         disasm_info.mach = bfd_mach_cris_v0_v10;
 212         print_insn = print_insn_crisv10;
 213     } else {
 214         disasm_info.mach = bfd_mach_cris_v32;
 215         print_insn = print_insn_crisv32;
 216     }
 217 #elif defined(TARGET_S390X)
 218     disasm_info.mach = bfd_mach_s390_64;
 219     print_insn = print_insn_s390;
 220 #elif defined(TARGET_MICROBLAZE)
 221     disasm_info.mach = bfd_arch_microblaze;
 222     print_insn = print_insn_microblaze;
 223 #elif defined(TARGET_LM32)
 224     disasm_info.mach = bfd_mach_lm32;
 225     print_insn = print_insn_lm32;
 226 #else
 227     fprintf(out, "0x" TARGET_FMT_lx
 228             ": Asm output not supported on this arch\n", code);
 229     return;
 230 #endif
 231
 232     for (pc = code; size > 0; pc += count, size -= count) {
 233         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 234         count = print_insn(pc, &disasm_info);
 235 #if 0
 236         {
 237             int i;
 238             uint8_t b;
 239             fprintf(out, " {");
 240             for(i = 0; i < count; i++) {
 241                 target_read_memory(pc + i, &b, 1, &disasm_info);
 242                 fprintf(out, " %02x", b);
 243             }
 244             fprintf(out, " }");
 245         }
 246 #endif
 247         fprintf(out, "\n");
 248         if (count < 0)
 249             break;
 250         if (size < count) {
 251             fprintf(out,
 252                     "Disassembler disagrees with translator over instruction "
 253                     "decoding\n"
 254                     "Please report this to qemu-devel@nongnu.org\n");
 255             break;
 256         }
 257     }
 258 }
 259
 260 /* Disassemble this for me please... (debugging). */
 261 void disas(FILE *out, void *code, unsigned long size)
 262 {
 263     unsigned long pc;
 264     int count;
 265     struct disassemble_info disasm_info;
 266     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 267
 268     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 269
 270     disasm_info.buffer = code;
 271     disasm_info.buffer_vma = (unsigned long)code;
 272     disasm_info.buffer_length = size;
 273
 274 #ifdef HOST_WORDS_BIGENDIAN
 275     disasm_info.endian = BFD_ENDIAN_BIG;
 276 #else
 277     disasm_info.endian = BFD_ENDIAN_LITTLE;
 278 #endif
 279 #if defined(CONFIG_TCG_INTERPRETER)
 280     print_insn = print_insn_tci;
 281 #elif defined(__i386__)
 282     disasm_info.mach = bfd_mach_i386_i386;
 283     print_insn = print_insn_i386;
 284 #elif defined(__x86_64__)
 285     disasm_info.mach = bfd_mach_x86_64;
 286     print_insn = print_insn_i386;
 287 #elif defined(_ARCH_PPC)
 288     print_insn = print_insn_ppc;
 289 #elif defined(__alpha__)
 290     print_insn = print_insn_alpha;
 291 #elif defined(__sparc__)
 292     print_insn = print_insn_sparc;
 293 #if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
 294     disasm_info.mach = bfd_mach_sparc_v9b;
 295 #endif
 296 #elif defined(__arm__)
 297     print_insn = print_insn_arm;
 298 #elif defined(__MIPSEB__)
 299     print_insn = print_insn_big_mips;
 300 #elif defined(__MIPSEL__)
 301     print_insn = print_insn_little_mips;
 302 #elif defined(__m68k__)
 303     print_insn = print_insn_m68k;
 304 #elif defined(__s390__)
 305     print_insn = print_insn_s390;
 306 #elif defined(__hppa__)
 307     print_insn = print_insn_hppa;
 308 #elif defined(__ia64__)
 309     print_insn = print_insn_ia64;
 310 #else
 311     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 312             (long) code);
 313     return;
 314 #endif
 315     for (pc = (unsigned long)code; size > 0; pc += count, size -= count) {
 316         fprintf(out, "0x%08lx:  ", pc);
 317         count = print_insn(pc, &disasm_info);
 318         fprintf(out, "\n");
 319         if (count < 0)
 320             break;
 321     }
 322 }
 323
 324 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 325 const char *lookup_symbol(target_ulong orig_addr)
 326 {
 327     const char *symbol = "";
 328     struct syminfo *s;
 329
 330     for (s = syminfos; s; s = s->next) {
 331         symbol = s->lookup_symbol(s, orig_addr);
 332         if (symbol[0] != '\0') {
 333             break;
 334         }
 335     }
 336
 337     return symbol;
 338 }
 339
 340 #if !defined(CONFIG_USER_ONLY)
 341
 342 #include "monitor.h"
 343
 344 static int monitor_disas_is_physical;
 345 static CPUArchState *monitor_disas_env;
 346
 347 static int
 348 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 349                      struct disassemble_info *info)
 350 {
 351     if (monitor_disas_is_physical) {
 352         cpu_physical_memory_read(memaddr, myaddr, length);
 353     } else {
 354         cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
 355     }
 356     return 0;
 357 }
 358
 359 static int GCC_FMT_ATTR(2, 3)
 360 monitor_fprintf(FILE *stream, const char *fmt, ...)
 361 {
 362     va_list ap;
 363     va_start(ap, fmt);
 364     monitor_vprintf((Monitor *)stream, fmt, ap);
 365     va_end(ap);
 366     return 0;
 367 }
 368
 369 void monitor_disas(Monitor *mon, CPUArchState *env,
 370                    target_ulong pc, int nb_insn, int is_physical, int flags)
 371 {
 372     int count, i;
 373     struct disassemble_info disasm_info;
 374     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 375
 376     INIT_DISASSEMBLE_INFO(disasm_info, (FILE *)mon, monitor_fprintf);
 377
 378     monitor_disas_env = env;
 379     monitor_disas_is_physical = is_physical;
 380     disasm_info.read_memory_func = monitor_read_memory;
 381
 382     disasm_info.buffer_vma = pc;
 383
 384 #ifdef TARGET_WORDS_BIGENDIAN
 385     disasm_info.endian = BFD_ENDIAN_BIG;
 386 #else
 387     disasm_info.endian = BFD_ENDIAN_LITTLE;
 388 #endif
 389 #if defined(TARGET_I386)
 390     if (flags == 2)
 391         disasm_info.mach = bfd_mach_x86_64;
 392     else if (flags == 1)
 393         disasm_info.mach = bfd_mach_i386_i8086;
 394     else
 395         disasm_info.mach = bfd_mach_i386_i386;
 396     print_insn = print_insn_i386;
 397 #elif defined(TARGET_ARM)
 398     print_insn = print_insn_arm;
 399 #elif defined(TARGET_ALPHA)
 400     print_insn = print_insn_alpha;
 401 #elif defined(TARGET_SPARC)
 402     print_insn = print_insn_sparc;
 403 #ifdef TARGET_SPARC64
 404     disasm_info.mach = bfd_mach_sparc_v9b;
 405 #endif
 406 #elif defined(TARGET_PPC)
 407 #ifdef TARGET_PPC64
 408     disasm_info.mach = bfd_mach_ppc64;
 409 #else
 410     disasm_info.mach = bfd_mach_ppc;
 411 #endif
 412     print_insn = print_insn_ppc;
 413 #elif defined(TARGET_M68K)
 414     print_insn = print_insn_m68k;
 415 #elif defined(TARGET_MIPS)
 416 #ifdef TARGET_WORDS_BIGENDIAN
 417     print_insn = print_insn_big_mips;
 418 #else
 419     print_insn = print_insn_little_mips;
 420 #endif
 421 #elif defined(TARGET_SH4)
 422     disasm_info.mach = bfd_mach_sh4;
 423     print_insn = print_insn_sh;
 424 #elif defined(TARGET_S390X)
 425     disasm_info.mach = bfd_mach_s390_64;
 426     print_insn = print_insn_s390;
 427 #elif defined(TARGET_LM32)
 428     disasm_info.mach = bfd_mach_lm32;
 429     print_insn = print_insn_lm32;
 430 #else
 431     monitor_printf(mon, "0x" TARGET_FMT_lx
 432                    ": Asm output not supported on this arch\n", pc);
 433     return;
 434 #endif
 435
 436     for(i = 0; i < nb_insn; i++) {
 437         monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
 438         count = print_insn(pc, &disasm_info);
 439         monitor_printf(mon, "\n");
 440         if (count < 0)
 441             break;
 442         pc += count;
 443     }
 444 }
 445 #endif