disas.c

   1 /* General "disassemble this chunk" code.  Used for debugging. */
   2 #include "config.h"
   3 #include "qemu-common.h"
   4 #include "disas/bfd.h"
   5 #include "elf.h"
   6 #include <errno.h>
   7
   8 #include "cpu.h"
   9 #include "disas/disas.h"
  10
  11 typedef struct CPUDebug {
  12     struct disassemble_info info;
  13     CPUState *cpu;
  14 } CPUDebug;
  15
  16 /* Filled in by elfload.c.  Simplistic, but will do for now. */
  17 struct syminfo *syminfos = NULL;
  18
  19 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  20    Transfer them to myaddr.  */
  21 int
  22 buffer_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
  23                    struct disassemble_info *info)
  24 {
  25     if (memaddr < info->buffer_vma
  26         || memaddr + length > info->buffer_vma + info->buffer_length)
  27         /* Out of bounds.  Use EIO because GDB uses it.  */
  28         return EIO;
  29     memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
  30     return 0;
  31 }
  32
  33 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  34    Transfer them to myaddr.  */
  35 static int
  36 target_read_memory (bfd_vma memaddr,
  37                     bfd_byte *myaddr,
  38                     int length,
  39                     struct disassemble_info *info)
  40 {
  41     CPUDebug *s = container_of(info, CPUDebug, info);
  42
  43     cpu_memory_rw_debug(s->cpu, memaddr, myaddr, length, 0);
  44     return 0;
  45 }
  46
  47 /* Print an error message.  We can assume that this is in response to
  48    an error return from buffer_read_memory.  */
  49 void
  50 perror_memory (int status, bfd_vma memaddr, struct disassemble_info *info)
  51 {
  52   if (status != EIO)
  53     /* Can't happen.  */
  54     (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
  55   else
  56     /* Actually, address between memaddr and memaddr + len was
  57        out of bounds.  */
  58     (*info->fprintf_func) (info->stream,
  59                            "Address 0x%" PRIx64 " is out of bounds.\n", memaddr);
  60 }
  61
  62 /* This could be in a separate file, to save minuscule amounts of space
  63    in statically linked executables.  */
  64
  65 /* Just print the address is hex.  This is included for completeness even
  66    though both GDB and objdump provide their own (to print symbolic
  67    addresses).  */
  68
  69 void
  70 generic_print_address (bfd_vma addr, struct disassemble_info *info)
  71 {
  72     (*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);
  73 }
  74
  75 /* Print address in hex, truncated to the width of a target virtual address. */
  76 static void
  77 generic_print_target_address(bfd_vma addr, struct disassemble_info *info)
  78 {
  79     uint64_t mask = ~0ULL >> (64 - TARGET_VIRT_ADDR_SPACE_BITS);
  80     generic_print_address(addr & mask, info);
  81 }
  82
  83 /* Print address in hex, truncated to the width of a host virtual address. */
  84 static void
  85 generic_print_host_address(bfd_vma addr, struct disassemble_info *info)
  86 {
  87     uint64_t mask = ~0ULL >> (64 - (sizeof(void *) * 8));
  88     generic_print_address(addr & mask, info);
  89 }
  90
  91 /* Just return the given address.  */
  92
  93 int
  94 generic_symbol_at_address (bfd_vma addr, struct disassemble_info *info)
  95 {
  96   return 1;
  97 }
  98
  99 bfd_vma bfd_getl64 (const bfd_byte *addr)
 100 {
 101   unsigned long long v;
 102
 103   v = (unsigned long long) addr[0];
 104   v |= (unsigned long long) addr[1] << 8;
 105   v |= (unsigned long long) addr[2] << 16;
 106   v |= (unsigned long long) addr[3] << 24;
 107   v |= (unsigned long long) addr[4] << 32;
 108   v |= (unsigned long long) addr[5] << 40;
 109   v |= (unsigned long long) addr[6] << 48;
 110   v |= (unsigned long long) addr[7] << 56;
 111   return (bfd_vma) v;
 112 }
 113
 114 bfd_vma bfd_getl32 (const bfd_byte *addr)
 115 {
 116   unsigned long v;
 117
 118   v = (unsigned long) addr[0];
 119   v |= (unsigned long) addr[1] << 8;
 120   v |= (unsigned long) addr[2] << 16;
 121   v |= (unsigned long) addr[3] << 24;
 122   return (bfd_vma) v;
 123 }
 124
 125 bfd_vma bfd_getb32 (const bfd_byte *addr)
 126 {
 127   unsigned long v;
 128
 129   v = (unsigned long) addr[0] << 24;
 130   v |= (unsigned long) addr[1] << 16;
 131   v |= (unsigned long) addr[2] << 8;
 132   v |= (unsigned long) addr[3];
 133   return (bfd_vma) v;
 134 }
 135
 136 bfd_vma bfd_getl16 (const bfd_byte *addr)
 137 {
 138   unsigned long v;
 139
 140   v = (unsigned long) addr[0];
 141   v |= (unsigned long) addr[1] << 8;
 142   return (bfd_vma) v;
 143 }
 144
 145 bfd_vma bfd_getb16 (const bfd_byte *addr)
 146 {
 147   unsigned long v;
 148
 149   v = (unsigned long) addr[0] << 24;
 150   v |= (unsigned long) addr[1] << 16;
 151   return (bfd_vma) v;
 152 }
 153
 154 static int print_insn_objdump(bfd_vma pc, disassemble_info *info,
 155                               const char *prefix)
 156 {
 157     int i, n = info->buffer_length;
 158     uint8_t *buf = g_malloc(n);
 159
 160     info->read_memory_func(pc, buf, n, info);
 161
 162     for (i = 0; i < n; ++i) {
 163         if (i % 32 == 0) {
 164             info->fprintf_func(info->stream, "\n%s: ", prefix);
 165         }
 166         info->fprintf_func(info->stream, "%02x", buf[i]);
 167     }
 168
 169     g_free(buf);
 170     return n;
 171 }
 172
 173 static int print_insn_od_host(bfd_vma pc, disassemble_info *info)
 174 {
 175     return print_insn_objdump(pc, info, "OBJD-H");
 176 }
 177
 178 static int print_insn_od_target(bfd_vma pc, disassemble_info *info)
 179 {
 180     return print_insn_objdump(pc, info, "OBJD-T");
 181 }
 182
 183 /* Disassemble this for me please... (debugging). 'flags' has the following
 184    values:
 185     i386 - 1 means 16 bit code, 2 means 64 bit code
 186     ppc  - bits 0:15 specify (optionally) the machine instruction set;
 187            bit 16 indicates little endian.
 188     other targets - unused
 189  */
 190 void target_disas(FILE *out, CPUState *cpu, target_ulong code,
 191                   target_ulong size, int flags)
 192 {
 193     CPUClass *cc = CPU_GET_CLASS(cpu);
 194     target_ulong pc;
 195     int count;
 196     CPUDebug s;
 197
 198     INIT_DISASSEMBLE_INFO(s.info, out, fprintf);
 199
 200     s.cpu = cpu;
 201     s.info.read_memory_func = target_read_memory;
 202     s.info.buffer_vma = code;
 203     s.info.buffer_length = size;
 204     s.info.print_address_func = generic_print_target_address;
 205
 206 #ifdef TARGET_WORDS_BIGENDIAN
 207     s.info.endian = BFD_ENDIAN_BIG;
 208 #else
 209     s.info.endian = BFD_ENDIAN_LITTLE;
 210 #endif
 211
 212     if (cc->disas_set_info) {
 213         cc->disas_set_info(cpu, &s.info);
 214     }
 215
 216 #if defined(TARGET_I386)
 217     if (flags == 2) {
 218         s.info.mach = bfd_mach_x86_64;
 219     } else if (flags == 1) {
 220         s.info.mach = bfd_mach_i386_i8086;
 221     } else {
 222         s.info.mach = bfd_mach_i386_i386;
 223     }
 224     s.info.print_insn = print_insn_i386;
 225 #elif defined(TARGET_SPARC)
 226     s.info.print_insn = print_insn_sparc;
 227 #ifdef TARGET_SPARC64
 228     s.info.mach = bfd_mach_sparc_v9b;
 229 #endif
 230 #elif defined(TARGET_PPC)
 231     if ((flags >> 16) & 1) {
 232         s.info.endian = BFD_ENDIAN_LITTLE;
 233     }
 234     if (flags & 0xFFFF) {
 235         /* If we have a precise definition of the instruction set, use it. */
 236         s.info.mach = flags & 0xFFFF;
 237     } else {
 238 #ifdef TARGET_PPC64
 239         s.info.mach = bfd_mach_ppc64;
 240 #else
 241         s.info.mach = bfd_mach_ppc;
 242 #endif
 243     }
 244     s.info.disassembler_options = (char *)"any";
 245     s.info.print_insn = print_insn_ppc;
 246 #elif defined(TARGET_M68K)
 247     s.info.print_insn = print_insn_m68k;
 248 #elif defined(TARGET_MIPS)
 249 #ifdef TARGET_WORDS_BIGENDIAN
 250     s.info.print_insn = print_insn_big_mips;
 251 #else
 252     s.info.print_insn = print_insn_little_mips;
 253 #endif
 254 #elif defined(TARGET_SH4)
 255     s.info.mach = bfd_mach_sh4;
 256     s.info.print_insn = print_insn_sh;
 257 #elif defined(TARGET_ALPHA)
 258     s.info.mach = bfd_mach_alpha_ev6;
 259     s.info.print_insn = print_insn_alpha;
 260 #elif defined(TARGET_S390X)
 261     s.info.mach = bfd_mach_s390_64;
 262     s.info.print_insn = print_insn_s390;
 263 #elif defined(TARGET_MOXIE)
 264     s.info.mach = bfd_arch_moxie;
 265     s.info.print_insn = print_insn_moxie;
 266 #elif defined(TARGET_LM32)
 267     s.info.mach = bfd_mach_lm32;
 268     s.info.print_insn = print_insn_lm32;
 269 #endif
 270     if (s.info.print_insn == NULL) {
 271         s.info.print_insn = print_insn_od_target;
 272     }
 273
 274     for (pc = code; size > 0; pc += count, size -= count) {
 275         fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
 276         count = s.info.print_insn(pc, &s.info);
 277 #if 0
 278         {
 279             int i;
 280             uint8_t b;
 281             fprintf(out, " {");
 282             for(i = 0; i < count; i++) {
 283                 target_read_memory(pc + i, &b, 1, &s.info);
 284                 fprintf(out, " %02x", b);
 285             }
 286             fprintf(out, " }");
 287         }
 288 #endif
 289         fprintf(out, "\n");
 290         if (count < 0)
 291             break;
 292         if (size < count) {
 293             fprintf(out,
 294                     "Disassembler disagrees with translator over instruction "
 295                     "decoding\n"
 296                     "Please report this to qemu-devel@nongnu.org\n");
 297             break;
 298         }
 299     }
 300 }
 301
 302 /* Disassemble this for me please... (debugging). */
 303 void disas(FILE *out, void *code, unsigned long size)
 304 {
 305     uintptr_t pc;
 306     int count;
 307     CPUDebug s;
 308     int (*print_insn)(bfd_vma pc, disassemble_info *info) = NULL;
 309
 310     INIT_DISASSEMBLE_INFO(s.info, out, fprintf);
 311     s.info.print_address_func = generic_print_host_address;
 312
 313     s.info.buffer = code;
 314     s.info.buffer_vma = (uintptr_t)code;
 315     s.info.buffer_length = size;
 316
 317 #ifdef HOST_WORDS_BIGENDIAN
 318     s.info.endian = BFD_ENDIAN_BIG;
 319 #else
 320     s.info.endian = BFD_ENDIAN_LITTLE;
 321 #endif
 322 #if defined(CONFIG_TCG_INTERPRETER)
 323     print_insn = print_insn_tci;
 324 #elif defined(__i386__)
 325     s.info.mach = bfd_mach_i386_i386;
 326     print_insn = print_insn_i386;
 327 #elif defined(__x86_64__)
 328     s.info.mach = bfd_mach_x86_64;
 329     print_insn = print_insn_i386;
 330 #elif defined(_ARCH_PPC)
 331     s.info.disassembler_options = (char *)"any";
 332     print_insn = print_insn_ppc;
 333 #elif defined(__aarch64__) && defined(CONFIG_ARM_A64_DIS)
 334     print_insn = print_insn_arm_a64;
 335 #elif defined(__alpha__)
 336     print_insn = print_insn_alpha;
 337 #elif defined(__sparc__)
 338     print_insn = print_insn_sparc;
 339     s.info.mach = bfd_mach_sparc_v9b;
 340 #elif defined(__arm__)
 341     print_insn = print_insn_arm;
 342 #elif defined(__MIPSEB__)
 343     print_insn = print_insn_big_mips;
 344 #elif defined(__MIPSEL__)
 345     print_insn = print_insn_little_mips;
 346 #elif defined(__m68k__)
 347     print_insn = print_insn_m68k;
 348 #elif defined(__s390__)
 349     print_insn = print_insn_s390;
 350 #elif defined(__hppa__)
 351     print_insn = print_insn_hppa;
 352 #elif defined(__ia64__)
 353     print_insn = print_insn_ia64;
 354 #endif
 355     if (print_insn == NULL) {
 356         print_insn = print_insn_od_host;
 357     }
 358     for (pc = (uintptr_t)code; size > 0; pc += count, size -= count) {
 359         fprintf(out, "0x%08" PRIxPTR ":  ", pc);
 360         count = print_insn(pc, &s.info);
 361         fprintf(out, "\n");
 362         if (count < 0)
 363             break;
 364     }
 365 }
 366
 367 /* Look up symbol for debugging purpose.  Returns "" if unknown. */
 368 const char *lookup_symbol(target_ulong orig_addr)
 369 {
 370     const char *symbol = "";
 371     struct syminfo *s;
 372
 373     for (s = syminfos; s; s = s->next) {
 374         symbol = s->lookup_symbol(s, orig_addr);
 375         if (symbol[0] != '\0') {
 376             break;
 377         }
 378     }
 379
 380     return symbol;
 381 }
 382
 383 #if !defined(CONFIG_USER_ONLY)
 384
 385 #include "monitor/monitor.h"
 386
 387 static int monitor_disas_is_physical;
 388
 389 static int
 390 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
 391                      struct disassemble_info *info)
 392 {
 393     CPUDebug *s = container_of(info, CPUDebug, info);
 394
 395     if (monitor_disas_is_physical) {
 396         cpu_physical_memory_read(memaddr, myaddr, length);
 397     } else {
 398         cpu_memory_rw_debug(s->cpu, memaddr, myaddr, length, 0);
 399     }
 400     return 0;
 401 }
 402
 403 static int GCC_FMT_ATTR(2, 3)
 404 monitor_fprintf(FILE *stream, const char *fmt, ...)
 405 {
 406     va_list ap;
 407     va_start(ap, fmt);
 408     monitor_vprintf((Monitor *)stream, fmt, ap);
 409     va_end(ap);
 410     return 0;
 411 }
 412
 413 /* Disassembler for the monitor.
 414    See target_disas for a description of flags. */
 415 void monitor_disas(Monitor *mon, CPUState *cpu,
 416                    target_ulong pc, int nb_insn, int is_physical, int flags)
 417 {
 418     CPUClass *cc = CPU_GET_CLASS(cpu);
 419     int count, i;
 420     CPUDebug s;
 421
 422     INIT_DISASSEMBLE_INFO(s.info, (FILE *)mon, monitor_fprintf);
 423
 424     s.cpu = cpu;
 425     monitor_disas_is_physical = is_physical;
 426     s.info.read_memory_func = monitor_read_memory;
 427     s.info.print_address_func = generic_print_target_address;
 428
 429     s.info.buffer_vma = pc;
 430
 431 #ifdef TARGET_WORDS_BIGENDIAN
 432     s.info.endian = BFD_ENDIAN_BIG;
 433 #else
 434     s.info.endian = BFD_ENDIAN_LITTLE;
 435 #endif
 436
 437     if (cc->disas_set_info) {
 438         cc->disas_set_info(cpu, &s.info);
 439     }
 440
 441 #if defined(TARGET_I386)
 442     if (flags == 2) {
 443         s.info.mach = bfd_mach_x86_64;
 444     } else if (flags == 1) {
 445         s.info.mach = bfd_mach_i386_i8086;
 446     } else {
 447         s.info.mach = bfd_mach_i386_i386;
 448     }
 449     s.info.print_insn = print_insn_i386;
 450 #elif defined(TARGET_ALPHA)
 451     s.info.print_insn = print_insn_alpha;
 452 #elif defined(TARGET_SPARC)
 453     s.info.print_insn = print_insn_sparc;
 454 #ifdef TARGET_SPARC64
 455     s.info.mach = bfd_mach_sparc_v9b;
 456 #endif
 457 #elif defined(TARGET_PPC)
 458     if (flags & 0xFFFF) {
 459         /* If we have a precise definition of the instruction set, use it. */
 460         s.info.mach = flags & 0xFFFF;
 461     } else {
 462 #ifdef TARGET_PPC64
 463         s.info.mach = bfd_mach_ppc64;
 464 #else
 465         s.info.mach = bfd_mach_ppc;
 466 #endif
 467     }
 468     if ((flags >> 16) & 1) {
 469         s.info.endian = BFD_ENDIAN_LITTLE;
 470     }
 471     s.info.print_insn = print_insn_ppc;
 472 #elif defined(TARGET_M68K)
 473     s.info.print_insn = print_insn_m68k;
 474 #elif defined(TARGET_MIPS)
 475 #ifdef TARGET_WORDS_BIGENDIAN
 476     s.info.print_insn = print_insn_big_mips;
 477 #else
 478     s.info.print_insn = print_insn_little_mips;
 479 #endif
 480 #elif defined(TARGET_SH4)
 481     s.info.mach = bfd_mach_sh4;
 482     s.info.print_insn = print_insn_sh;
 483 #elif defined(TARGET_S390X)
 484     s.info.mach = bfd_mach_s390_64;
 485     s.info.print_insn = print_insn_s390;
 486 #elif defined(TARGET_MOXIE)
 487     s.info.mach = bfd_arch_moxie;
 488     s.info.print_insn = print_insn_moxie;
 489 #elif defined(TARGET_LM32)
 490     s.info.mach = bfd_mach_lm32;
 491     s.info.print_insn = print_insn_lm32;
 492 #endif
 493     if (!s.info.print_insn) {
 494         monitor_printf(mon, "0x" TARGET_FMT_lx
 495                        ": Asm output not supported on this arch\n", pc);
 496         return;
 497     }
 498
 499     for(i = 0; i < nb_insn; i++) {
 500         monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
 501         count = s.info.print_insn(pc, &s.info);
 502         monitor_printf(mon, "\n");
 503         if (count < 0)
 504             break;
 505         pc += count;
 506     }
 507 }
 508 #endif