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  - bit 0 = thumb, bit 1 = reverse endian
 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 & 1) {
 173         print_insn = print_insn_thumb1;
 174     } else {
 175         print_insn = print_insn_arm;
 176     }
 177     if (flags & 2) {
 178 #ifdef TARGET_WORDS_BIGENDIAN
 179         disasm_info.endian = BFD_ENDIAN_LITTLE;
 180 #else
 181         disasm_info.endian = BFD_ENDIAN_BIG;
 182 #endif
 183     }
 184 #elif defined(TARGET_SPARC)
 185     print_insn = print_insn_sparc;
 186 #ifdef TARGET_SPARC64
 187     disasm_info.mach = bfd_mach_sparc_v9b;
 188 #endif
 189 #elif defined(TARGET_PPC)
 190     if (flags >> 16)
 191         disasm_info.endian = BFD_ENDIAN_LITTLE;
 192     if (flags & 0xFFFF) {
 193         /* If we have a precise definitions of the instructions set, use it */
 194         disasm_info.mach = flags & 0xFFFF;
 195     } else {
 196 #ifdef TARGET_PPC64
 197         disasm_info.mach = bfd_mach_ppc64;
 198 #else
 199         disasm_info.mach = bfd_mach_ppc;
 200 #endif
 201     }
 202     print_insn = print_insn_ppc;
 203 #elif defined(TARGET_M68K)
 204     print_insn = print_insn_m68k;
 205 #elif defined(TARGET_MIPS)
 206 #ifdef TARGET_WORDS_BIGENDIAN
 207     print_insn = print_insn_big_mips;
 208 #else
 209     print_insn = print_insn_little_mips;
 210 #endif
 211 #elif defined(TARGET_SH4)
 212     disasm_info.mach = bfd_mach_sh4;
 213     print_insn = print_insn_sh;
 214 #elif defined(TARGET_ALPHA)
 215     disasm_info.mach = bfd_mach_alpha_ev6;
 216     print_insn = print_insn_alpha;
 217 #elif defined(TARGET_CRIS)
 218     if (flags != 32) {
 219         disasm_info.mach = bfd_mach_cris_v0_v10;
 220         print_insn = print_insn_crisv10;
 221     } else {
 222         disasm_info.mach = bfd_mach_cris_v32;
 223         print_insn = print_insn_crisv32;
 224     }
 225 #elif defined(TARGET_S390X)
 226     disasm_info.mach = bfd_mach_s390_64;
 227     print_insn = print_insn_s390;
 228 #elif defined(TARGET_MICROBLAZE)
 229     disasm_info.mach = bfd_arch_microblaze;
 230     print_insn = print_insn_microblaze;
 231 #elif defined(TARGET_LM32)
 232     disasm_info.mach = bfd_mach_lm32;
 233     print_insn = print_insn_lm32;
 234 #else
 235     fprintf(out, "0x" TARGET_FMT_lx
 236             ": Asm output not supported on this arch\n", code);
 237     return;
 238 #endif
 239
 240     for (pc = code; size > 0; pc += count, size -= count) {
 241         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 242         count = print_insn(pc, &disasm_info);
 243 #if 0
 244         {
 245             int i;
 246             uint8_t b;
 247             fprintf(out, " {");
 248             for(i = 0; i < count; i++) {
 249                 target_read_memory(pc + i, &b, 1, &disasm_info);
 250                 fprintf(out, " %02x", b);
 251             }
 252             fprintf(out, " }");
 253         }
 254 #endif
 255         fprintf(out, "\n");
 256         if (count < 0)
 257             break;
 258         if (size < count) {
 259             fprintf(out,
 260                     "Disassembler disagrees with translator over instruction "
 261                     "decoding\n"
 262                     "Please report this to qemu-devel@nongnu.org\n");
 263             break;
 264         }
 265     }
 266 }
 267
 268 /* Disassemble this for me please... (debugging). */
 269 void disas(FILE *out, void *code, unsigned long size)
 270 {
 271     uintptr_t pc;
 272     int count;
 273     struct disassemble_info disasm_info;
 274     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 275
 276     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
 277
 278     disasm_info.buffer = code;
 279     disasm_info.buffer_vma = (uintptr_t)code;
 280     disasm_info.buffer_length = size;
 281
 282 #ifdef HOST_WORDS_BIGENDIAN
 283     disasm_info.endian = BFD_ENDIAN_BIG;
 284 #else
 285     disasm_info.endian = BFD_ENDIAN_LITTLE;
 286 #endif
 287 #if defined(CONFIG_TCG_INTERPRETER)
 288     print_insn = print_insn_tci;
 289 #elif defined(__i386__)
 290     disasm_info.mach = bfd_mach_i386_i386;
 291     print_insn = print_insn_i386;
 292 #elif defined(__x86_64__)
 293     disasm_info.mach = bfd_mach_x86_64;
 294     print_insn = print_insn_i386;
 295 #elif defined(_ARCH_PPC)
 296     print_insn = print_insn_ppc;
 297 #elif defined(__alpha__)
 298     print_insn = print_insn_alpha;
 299 #elif defined(__sparc__)
 300     print_insn = print_insn_sparc;
 301 #if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
 302     disasm_info.mach = bfd_mach_sparc_v9b;
 303 #endif
 304 #elif defined(__arm__)
 305     print_insn = print_insn_arm;
 306 #elif defined(__MIPSEB__)
 307     print_insn = print_insn_big_mips;
 308 #elif defined(__MIPSEL__)
 309     print_insn = print_insn_little_mips;
 310 #elif defined(__m68k__)
 311     print_insn = print_insn_m68k;
 312 #elif defined(__s390__)
 313     print_insn = print_insn_s390;
 314 #elif defined(__hppa__)
 315     print_insn = print_insn_hppa;
 316 #elif defined(__ia64__)
 317     print_insn = print_insn_ia64;
 318 #else
 319     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
 320             (long) code);
 321     return;
 322 #endif
 323     for (pc = (uintptr_t)code; size > 0; pc += count, size -= count) {
 324         fprintf(out, "0x%08" PRIxPTR ":  ", pc);
 325         count = print_insn(pc, &disasm_info);
 326         fprintf(out, "\n");
 327         if (count < 0)
 328             break;
 329     }
 330 }
 331
 332 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 333 const char *lookup_symbol(target_ulong orig_addr)
 334 {
 335     const char *symbol = "";
 336     struct syminfo *s;
 337
 338     for (s = syminfos; s; s = s->next) {
 339         symbol = s->lookup_symbol(s, orig_addr);
 340         if (symbol[0] != '\0') {
 341             break;
 342         }
 343     }
 344
 345     return symbol;
 346 }
 347
 348 #if !defined(CONFIG_USER_ONLY)
 349
 350 #include "monitor.h"
 351
 352 static int monitor_disas_is_physical;
 353 static CPUArchState *monitor_disas_env;
 354
 355 static int
 356 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 357                      struct disassemble_info *info)
 358 {
 359     if (monitor_disas_is_physical) {
 360         cpu_physical_memory_read(memaddr, myaddr, length);
 361     } else {
 362         cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
 363     }
 364     return 0;
 365 }
 366
 367 static int GCC_FMT_ATTR(2, 3)
 368 monitor_fprintf(FILE *stream, const char *fmt, ...)
 369 {
 370     va_list ap;
 371     va_start(ap, fmt);
 372     monitor_vprintf((Monitor *)stream, fmt, ap);
 373     va_end(ap);
 374     return 0;
 375 }
 376
 377 void monitor_disas(Monitor *mon, CPUArchState *env,
 378                    target_ulong pc, int nb_insn, int is_physical, int flags)
 379 {
 380     int count, i;
 381     struct disassemble_info disasm_info;
 382     int (*print_insn)(bfd_vma pc, disassemble_info *info);
 383
 384     INIT_DISASSEMBLE_INFO(disasm_info, (FILE *)mon, monitor_fprintf);
 385
 386     monitor_disas_env = env;
 387     monitor_disas_is_physical = is_physical;
 388     disasm_info.read_memory_func = monitor_read_memory;
 389
 390     disasm_info.buffer_vma = pc;
 391
 392 #ifdef TARGET_WORDS_BIGENDIAN
 393     disasm_info.endian = BFD_ENDIAN_BIG;
 394 #else
 395     disasm_info.endian = BFD_ENDIAN_LITTLE;
 396 #endif
 397 #if defined(TARGET_I386)
 398     if (flags == 2)
 399         disasm_info.mach = bfd_mach_x86_64;
 400     else if (flags == 1)
 401         disasm_info.mach = bfd_mach_i386_i8086;
 402     else
 403         disasm_info.mach = bfd_mach_i386_i386;
 404     print_insn = print_insn_i386;
 405 #elif defined(TARGET_ARM)
 406     print_insn = print_insn_arm;
 407 #elif defined(TARGET_ALPHA)
 408     print_insn = print_insn_alpha;
 409 #elif defined(TARGET_SPARC)
 410     print_insn = print_insn_sparc;
 411 #ifdef TARGET_SPARC64
 412     disasm_info.mach = bfd_mach_sparc_v9b;
 413 #endif
 414 #elif defined(TARGET_PPC)
 415 #ifdef TARGET_PPC64
 416     disasm_info.mach = bfd_mach_ppc64;
 417 #else
 418     disasm_info.mach = bfd_mach_ppc;
 419 #endif
 420     print_insn = print_insn_ppc;
 421 #elif defined(TARGET_M68K)
 422     print_insn = print_insn_m68k;
 423 #elif defined(TARGET_MIPS)
 424 #ifdef TARGET_WORDS_BIGENDIAN
 425     print_insn = print_insn_big_mips;
 426 #else
 427     print_insn = print_insn_little_mips;
 428 #endif
 429 #elif defined(TARGET_SH4)
 430     disasm_info.mach = bfd_mach_sh4;
 431     print_insn = print_insn_sh;
 432 #elif defined(TARGET_S390X)
 433     disasm_info.mach = bfd_mach_s390_64;
 434     print_insn = print_insn_s390;
 435 #elif defined(TARGET_LM32)
 436     disasm_info.mach = bfd_mach_lm32;
 437     print_insn = print_insn_lm32;
 438 #else
 439     monitor_printf(mon, "0x" TARGET_FMT_lx
 440                    ": Asm output not supported on this arch\n", pc);
 441     return;
 442 #endif
 443
 444     for(i = 0; i < nb_insn; i++) {
 445         monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
 446         count = print_insn(pc, &disasm_info);
 447         monitor_printf(mon, "\n");
 448         if (count < 0)
 449             break;
 450         pc += count;
 451     }
 452 }
 453 #endif