File:  [Qemu by Fabrice Bellard] / qemu / disas.c
Revision 1.1.1.11 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 18:33:29 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu0150, qemu0141, qemu0140, HEAD
qemu 0.14.0

    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_getl64 (const bfd_byte *addr)
   77: {
   78:   unsigned long long v;
   79: 
   80:   v = (unsigned long long) addr[0];
   81:   v |= (unsigned long long) addr[1] << 8;
   82:   v |= (unsigned long long) addr[2] << 16;
   83:   v |= (unsigned long long) addr[3] << 24;
   84:   v |= (unsigned long long) addr[4] << 32;
   85:   v |= (unsigned long long) addr[5] << 40;
   86:   v |= (unsigned long long) addr[6] << 48;
   87:   v |= (unsigned long long) addr[7] << 56;
   88:   return (bfd_vma) v;
   89: }
   90: 
   91: bfd_vma bfd_getl32 (const bfd_byte *addr)
   92: {
   93:   unsigned long v;
   94: 
   95:   v = (unsigned long) addr[0];
   96:   v |= (unsigned long) addr[1] << 8;
   97:   v |= (unsigned long) addr[2] << 16;
   98:   v |= (unsigned long) addr[3] << 24;
   99:   return (bfd_vma) v;
  100: }
  101: 
  102: bfd_vma bfd_getb32 (const bfd_byte *addr)
  103: {
  104:   unsigned long v;
  105: 
  106:   v = (unsigned long) addr[0] << 24;
  107:   v |= (unsigned long) addr[1] << 16;
  108:   v |= (unsigned long) addr[2] << 8;
  109:   v |= (unsigned long) addr[3];
  110:   return (bfd_vma) v;
  111: }
  112: 
  113: bfd_vma bfd_getl16 (const bfd_byte *addr)
  114: {
  115:   unsigned long v;
  116: 
  117:   v = (unsigned long) addr[0];
  118:   v |= (unsigned long) addr[1] << 8;
  119:   return (bfd_vma) v;
  120: }
  121: 
  122: bfd_vma bfd_getb16 (const bfd_byte *addr)
  123: {
  124:   unsigned long v;
  125: 
  126:   v = (unsigned long) addr[0] << 24;
  127:   v |= (unsigned long) addr[1] << 16;
  128:   return (bfd_vma) v;
  129: }
  130: 
  131: #ifdef TARGET_ARM
  132: static int
  133: print_insn_thumb1(bfd_vma pc, disassemble_info *info)
  134: {
  135:   return print_insn_arm(pc | 1, info);
  136: }
  137: #endif
  138: 
  139: /* Disassemble this for me please... (debugging). 'flags' has the following
  140:    values:
  141:     i386 - nonzero means 16 bit code
  142:     arm  - nonzero means thumb code
  143:     ppc  - nonzero means little endian
  144:     other targets - unused
  145:  */
  146: void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
  147: {
  148:     target_ulong pc;
  149:     int count;
  150:     struct disassemble_info disasm_info;
  151:     int (*print_insn)(bfd_vma pc, disassemble_info *info);
  152: 
  153:     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
  154: 
  155:     disasm_info.read_memory_func = target_read_memory;
  156:     disasm_info.buffer_vma = code;
  157:     disasm_info.buffer_length = size;
  158: 
  159: #ifdef TARGET_WORDS_BIGENDIAN
  160:     disasm_info.endian = BFD_ENDIAN_BIG;
  161: #else
  162:     disasm_info.endian = BFD_ENDIAN_LITTLE;
  163: #endif
  164: #if defined(TARGET_I386)
  165:     if (flags == 2)
  166:         disasm_info.mach = bfd_mach_x86_64;
  167:     else if (flags == 1)
  168:         disasm_info.mach = bfd_mach_i386_i8086;
  169:     else
  170:         disasm_info.mach = bfd_mach_i386_i386;
  171:     print_insn = print_insn_i386;
  172: #elif defined(TARGET_ARM)
  173:     if (flags)
  174: 	print_insn = print_insn_thumb1;
  175:     else
  176: 	print_insn = print_insn_arm;
  177: #elif defined(TARGET_SPARC)
  178:     print_insn = print_insn_sparc;
  179: #ifdef TARGET_SPARC64
  180:     disasm_info.mach = bfd_mach_sparc_v9b;
  181: #endif
  182: #elif defined(TARGET_PPC)
  183:     if (flags >> 16)
  184:         disasm_info.endian = BFD_ENDIAN_LITTLE;
  185:     if (flags & 0xFFFF) {
  186:         /* If we have a precise definitions of the instructions set, use it */
  187:         disasm_info.mach = flags & 0xFFFF;
  188:     } else {
  189: #ifdef TARGET_PPC64
  190:         disasm_info.mach = bfd_mach_ppc64;
  191: #else
  192:         disasm_info.mach = bfd_mach_ppc;
  193: #endif
  194:     }
  195:     print_insn = print_insn_ppc;
  196: #elif defined(TARGET_M68K)
  197:     print_insn = print_insn_m68k;
  198: #elif defined(TARGET_MIPS)
  199: #ifdef TARGET_WORDS_BIGENDIAN
  200:     print_insn = print_insn_big_mips;
  201: #else
  202:     print_insn = print_insn_little_mips;
  203: #endif
  204: #elif defined(TARGET_SH4)
  205:     disasm_info.mach = bfd_mach_sh4;
  206:     print_insn = print_insn_sh;
  207: #elif defined(TARGET_ALPHA)
  208:     disasm_info.mach = bfd_mach_alpha;
  209:     print_insn = print_insn_alpha;
  210: #elif defined(TARGET_CRIS)
  211:     if (flags != 32) {
  212:         disasm_info.mach = bfd_mach_cris_v0_v10;
  213:         print_insn = print_insn_crisv10;
  214:     } else {
  215:         disasm_info.mach = bfd_mach_cris_v32;
  216:         print_insn = print_insn_crisv32;
  217:     }
  218: #elif defined(TARGET_MICROBLAZE)
  219:     disasm_info.mach = bfd_arch_microblaze;
  220:     print_insn = print_insn_microblaze;
  221: #else
  222:     fprintf(out, "0x" TARGET_FMT_lx
  223: 	    ": Asm output not supported on this arch\n", code);
  224:     return;
  225: #endif
  226: 
  227:     for (pc = code; size > 0; pc += count, size -= count) {
  228: 	fprintf(out, "0x" TARGET_FMT_lx ":  ", pc);
  229: 	count = print_insn(pc, &disasm_info);
  230: #if 0
  231:         {
  232:             int i;
  233:             uint8_t b;
  234:             fprintf(out, " {");
  235:             for(i = 0; i < count; i++) {
  236:                 target_read_memory(pc + i, &b, 1, &disasm_info);
  237:                 fprintf(out, " %02x", b);
  238:             }
  239:             fprintf(out, " }");
  240:         }
  241: #endif
  242: 	fprintf(out, "\n");
  243: 	if (count < 0)
  244: 	    break;
  245:         if (size < count) {
  246:             fprintf(out,
  247:                     "Disassembler disagrees with translator over instruction "
  248:                     "decoding\n"
  249:                     "Please report this to qemu-devel@nongnu.org\n");
  250:             break;
  251:         }
  252:     }
  253: }
  254: 
  255: /* Disassemble this for me please... (debugging). */
  256: void disas(FILE *out, void *code, unsigned long size)
  257: {
  258:     unsigned long pc;
  259:     int count;
  260:     struct disassemble_info disasm_info;
  261:     int (*print_insn)(bfd_vma pc, disassemble_info *info);
  262: 
  263:     INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
  264: 
  265:     disasm_info.buffer = code;
  266:     disasm_info.buffer_vma = (unsigned long)code;
  267:     disasm_info.buffer_length = size;
  268: 
  269: #ifdef HOST_WORDS_BIGENDIAN
  270:     disasm_info.endian = BFD_ENDIAN_BIG;
  271: #else
  272:     disasm_info.endian = BFD_ENDIAN_LITTLE;
  273: #endif
  274: #if defined(__i386__)
  275:     disasm_info.mach = bfd_mach_i386_i386;
  276:     print_insn = print_insn_i386;
  277: #elif defined(__x86_64__)
  278:     disasm_info.mach = bfd_mach_x86_64;
  279:     print_insn = print_insn_i386;
  280: #elif defined(_ARCH_PPC)
  281:     print_insn = print_insn_ppc;
  282: #elif defined(__alpha__)
  283:     print_insn = print_insn_alpha;
  284: #elif defined(__sparc__)
  285:     print_insn = print_insn_sparc;
  286: #if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
  287:     disasm_info.mach = bfd_mach_sparc_v9b;
  288: #endif
  289: #elif defined(__arm__)
  290:     print_insn = print_insn_arm;
  291: #elif defined(__MIPSEB__)
  292:     print_insn = print_insn_big_mips;
  293: #elif defined(__MIPSEL__)
  294:     print_insn = print_insn_little_mips;
  295: #elif defined(__m68k__)
  296:     print_insn = print_insn_m68k;
  297: #elif defined(__s390__)
  298:     print_insn = print_insn_s390;
  299: #elif defined(__hppa__)
  300:     print_insn = print_insn_hppa;
  301: #elif defined(__ia64__)
  302:     print_insn = print_insn_ia64;
  303: #else
  304:     fprintf(out, "0x%lx: Asm output not supported on this arch\n",
  305: 	    (long) code);
  306:     return;
  307: #endif
  308:     for (pc = (unsigned long)code; size > 0; pc += count, size -= count) {
  309: 	fprintf(out, "0x%08lx:  ", pc);
  310: 	count = print_insn(pc, &disasm_info);
  311: 	fprintf(out, "\n");
  312: 	if (count < 0)
  313: 	    break;
  314:     }
  315: }
  316: 
  317: /* Look up symbol for debugging purpose.  Returns "" if unknown. */
  318: const char *lookup_symbol(target_ulong orig_addr)
  319: {
  320:     const char *symbol = "";
  321:     struct syminfo *s;
  322: 
  323:     for (s = syminfos; s; s = s->next) {
  324:         symbol = s->lookup_symbol(s, orig_addr);
  325:         if (symbol[0] != '\0') {
  326:             break;
  327:         }
  328:     }
  329: 
  330:     return symbol;
  331: }
  332: 
  333: #if !defined(CONFIG_USER_ONLY)
  334: 
  335: #include "monitor.h"
  336: 
  337: static int monitor_disas_is_physical;
  338: static CPUState *monitor_disas_env;
  339: 
  340: static int
  341: monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
  342:                      struct disassemble_info *info)
  343: {
  344:     if (monitor_disas_is_physical) {
  345:         cpu_physical_memory_rw(memaddr, myaddr, length, 0);
  346:     } else {
  347:         cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
  348:     }
  349:     return 0;
  350: }
  351: 
  352: static int GCC_FMT_ATTR(2, 3)
  353: monitor_fprintf(FILE *stream, const char *fmt, ...)
  354: {
  355:     va_list ap;
  356:     va_start(ap, fmt);
  357:     monitor_vprintf((Monitor *)stream, fmt, ap);
  358:     va_end(ap);
  359:     return 0;
  360: }
  361: 
  362: void monitor_disas(Monitor *mon, CPUState *env,
  363:                    target_ulong pc, int nb_insn, int is_physical, int flags)
  364: {
  365:     int count, i;
  366:     struct disassemble_info disasm_info;
  367:     int (*print_insn)(bfd_vma pc, disassemble_info *info);
  368: 
  369:     INIT_DISASSEMBLE_INFO(disasm_info, (FILE *)mon, monitor_fprintf);
  370: 
  371:     monitor_disas_env = env;
  372:     monitor_disas_is_physical = is_physical;
  373:     disasm_info.read_memory_func = monitor_read_memory;
  374: 
  375:     disasm_info.buffer_vma = pc;
  376: 
  377: #ifdef TARGET_WORDS_BIGENDIAN
  378:     disasm_info.endian = BFD_ENDIAN_BIG;
  379: #else
  380:     disasm_info.endian = BFD_ENDIAN_LITTLE;
  381: #endif
  382: #if defined(TARGET_I386)
  383:     if (flags == 2)
  384:         disasm_info.mach = bfd_mach_x86_64;
  385:     else if (flags == 1)
  386:         disasm_info.mach = bfd_mach_i386_i8086;
  387:     else
  388:         disasm_info.mach = bfd_mach_i386_i386;
  389:     print_insn = print_insn_i386;
  390: #elif defined(TARGET_ARM)
  391:     print_insn = print_insn_arm;
  392: #elif defined(TARGET_ALPHA)
  393:     print_insn = print_insn_alpha;
  394: #elif defined(TARGET_SPARC)
  395:     print_insn = print_insn_sparc;
  396: #ifdef TARGET_SPARC64
  397:     disasm_info.mach = bfd_mach_sparc_v9b;
  398: #endif
  399: #elif defined(TARGET_PPC)
  400: #ifdef TARGET_PPC64
  401:     disasm_info.mach = bfd_mach_ppc64;
  402: #else
  403:     disasm_info.mach = bfd_mach_ppc;
  404: #endif
  405:     print_insn = print_insn_ppc;
  406: #elif defined(TARGET_M68K)
  407:     print_insn = print_insn_m68k;
  408: #elif defined(TARGET_MIPS)
  409: #ifdef TARGET_WORDS_BIGENDIAN
  410:     print_insn = print_insn_big_mips;
  411: #else
  412:     print_insn = print_insn_little_mips;
  413: #endif
  414: #elif defined(TARGET_SH4)
  415:     disasm_info.mach = bfd_mach_sh4;
  416:     print_insn = print_insn_sh;
  417: #else
  418:     monitor_printf(mon, "0x" TARGET_FMT_lx
  419:                    ": Asm output not supported on this arch\n", pc);
  420:     return;
  421: #endif
  422: 
  423:     for(i = 0; i < nb_insn; i++) {
  424: 	monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
  425: 	count = print_insn(pc, &disasm_info);
  426: 	monitor_printf(mon, "\n");
  427: 	if (count < 0)
  428: 	    break;
  429:         pc += count;
  430:     }
  431: }
  432: #endif

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