File:  [Qemu by Fabrice Bellard] / qemu / disas.c
Revision 1.1.1.7 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 16:50:24 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu0105, qemu0104, qemu0103, qemu0102, qemu0101, qemu0100, HEAD
qemu 0.10.0

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

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