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 - nonzero means 16 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 #else
 224     fprintf(out, "0x" TARGET_FMT_lx
 225             ": Asm output not supported on this arch\n", code);
 226     return;
 227 #endif
 228
 229     for (pc = code; size > 0; pc += count, size -= count) {
 230         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 231         count = print_insn(pc, &disasm_info);
 232 #if 0
 233         {
 234             int i;
 235             uint8_t b;
 236             fprintf(out, " {");
 237             for(i = 0; i < count; i++) {
 238                 target_read_memory(pc + i, &b, 1, &disasm_info);
 239                 fprintf(out, " %02x", b);
 240             }
 241             fprintf(out, " }");
 242         }
 243 #endif
 244         fprintf(out, "\n");
 245         if (count < 0)
 246             break;
 247         if (size < count) {
 248             fprintf(out,
 249                     "Disassembler disagrees with translator over instruction "
 250                     "decoding\n"
 251                     "Please report this to qemu-devel@nongnu.org\n");
 252             break;
 253         }
 254     }
 255 }
 256
 257 /* Disassemble this for me please... (debugging). */
 258 void disas(FILE *out, void *code, unsigned long size)
 259 {
 260     unsigned long pc;
 261     int count;
 262     struct disassemble_info disasm_info;
 263     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 264
 265     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 266
 267     disasm_info.buffer = code;
 268     disasm_info.buffer_vma = (unsigned long)code;
 269     disasm_info.buffer_length = size;
 270
 271 #ifdef HOST_WORDS_BIGENDIAN
 272     disasm_info.endian = BFD_ENDIAN_BIG;
 273 #else
 274     disasm_info.endian = BFD_ENDIAN_LITTLE;
 275 #endif
 276 #if defined(__i386__)
 277     disasm_info.mach = bfd_mach_i386_i386;
 278     print_insn = print_insn_i386;
 279 #elif defined(__x86_64__)
 280     disasm_info.mach = bfd_mach_x86_64;
 281     print_insn = print_insn_i386;
 282 #elif defined(_ARCH_PPC)
 283     print_insn = print_insn_ppc;
 284 #elif defined(__alpha__)
 285     print_insn = print_insn_alpha;
 286 #elif defined(__sparc__)
 287     print_insn = print_insn_sparc;
 288 #if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
 289     disasm_info.mach = bfd_mach_sparc_v9b;
 290 #endif
 291 #elif defined(__arm__)
 292     print_insn = print_insn_arm;
 293 #elif defined(__MIPSEB__)
 294     print_insn = print_insn_big_mips;
 295 #elif defined(__MIPSEL__)
 296     print_insn = print_insn_little_mips;
 297 #elif defined(__m68k__)
 298     print_insn = print_insn_m68k;
 299 #elif defined(__s390__)
 300     print_insn = print_insn_s390;
 301 #elif defined(__hppa__)
 302     print_insn = print_insn_hppa;
 303 #elif defined(__ia64__)
 304     print_insn = print_insn_ia64;
 305 #else
 306     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 307             (long) code);
 308     return;
 309 #endif
 310     for (pc = (unsigned long)code; size > 0; pc += count, size -= count) {
 311         fprintf(out, "0x%08lx:  ", pc);
 312         count = print_insn(pc, &disasm_info);
 313         fprintf(out, "\n");
 314         if (count < 0)
 315             break;
 316     }
 317 }
 318
 319 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 320 const char *lookup_symbol(target_ulong orig_addr)
 321 {
 322     const char *symbol = "";
 323     struct syminfo *s;
 324
 325     for (s = syminfos; s; s = s->next) {
 326         symbol = s->lookup_symbol(s, orig_addr);
 327         if (symbol[0] != '\0') {
 328             break;
 329         }
 330     }
 331
 332     return symbol;
 333 }
 334
 335 #if !defined(CONFIG_USER_ONLY)
 336
 337 #include "monitor.h"
 338
 339 static int monitor_disas_is_physical;
 340 static CPUState *monitor_disas_env;
 341
 342 static int
 343 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 344                      struct disassemble_info *info)
 345 {
 346     if (monitor_disas_is_physical) {
 347         cpu_physical_memory_read(memaddr, myaddr, length);
 348     } else {
 349         cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
 350     }
 351     return 0;
 352 }
 353
 354 static int GCC_FMT_ATTR(2, 3)
 355 monitor_fprintf(FILE *stream, const char *fmt, ...)
 356 {
 357     va_list ap;
 358     va_start(ap, fmt);
 359     monitor_vprintf((Monitor *)stream, fmt, ap);
 360     va_end(ap);
 361     return 0;
 362 }
 363
 364 void monitor_disas(Monitor *mon, CPUState *env,
 365                    target_ulong pc, int nb_insn, int is_physical, int flags)
 366 {
 367     int count, i;
 368     struct disassemble_info disasm_info;
 369     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 370
 371     INIT_DISASSEMBLE_INFO(disasm_info, (FILE *)mon, monitor_fprintf);
 372
 373     monitor_disas_env = env;
 374     monitor_disas_is_physical = is_physical;
 375     disasm_info.read_memory_func = monitor_read_memory;
 376
 377     disasm_info.buffer_vma = pc;
 378
 379 #ifdef TARGET_WORDS_BIGENDIAN
 380     disasm_info.endian = BFD_ENDIAN_BIG;
 381 #else
 382     disasm_info.endian = BFD_ENDIAN_LITTLE;
 383 #endif
 384 #if defined(TARGET_I386)
 385     if (flags == 2)
 386         disasm_info.mach = bfd_mach_x86_64;
 387     else if (flags == 1)
 388         disasm_info.mach = bfd_mach_i386_i8086;
 389     else
 390         disasm_info.mach = bfd_mach_i386_i386;
 391     print_insn = print_insn_i386;
 392 #elif defined(TARGET_ARM)
 393     print_insn = print_insn_arm;
 394 #elif defined(TARGET_ALPHA)
 395     print_insn = print_insn_alpha;
 396 #elif defined(TARGET_SPARC)
 397     print_insn = print_insn_sparc;
 398 #ifdef TARGET_SPARC64
 399     disasm_info.mach = bfd_mach_sparc_v9b;
 400 #endif
 401 #elif defined(TARGET_PPC)
 402 #ifdef TARGET_PPC64
 403     disasm_info.mach = bfd_mach_ppc64;
 404 #else
 405     disasm_info.mach = bfd_mach_ppc;
 406 #endif
 407     print_insn = print_insn_ppc;
 408 #elif defined(TARGET_M68K)
 409     print_insn = print_insn_m68k;
 410 #elif defined(TARGET_MIPS)
 411 #ifdef TARGET_WORDS_BIGENDIAN
 412     print_insn = print_insn_big_mips;
 413 #else
 414     print_insn = print_insn_little_mips;
 415 #endif
 416 #elif defined(TARGET_SH4)
 417     disasm_info.mach = bfd_mach_sh4;
 418     print_insn = print_insn_sh;
 419 #elif defined(TARGET_S390X)
 420     disasm_info.mach = bfd_mach_s390_64;
 421     print_insn = print_insn_s390;
 422 #else
 423     monitor_printf(mon, "0x" TARGET_FMT_lx
 424                    ": Asm output not supported on this arch\n", pc);
 425     return;
 426 #endif
 427
 428     for(i = 0; i < nb_insn; i++) {
 429         monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
 430         count = print_insn(pc, &disasm_info);
 431         monitor_printf(mon, "\n");
 432         if (count < 0)
 433             break;
 434         pc += count;
 435     }
 436 }
 437 #endif