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