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