bellard | b9adb4a | 2003-04-29 20:41:16 +0000 | [diff] [blame] | 1 | /* General "disassemble this chunk" code. Used for debugging. */ |
bellard | 5bbe929 | 2003-06-09 19:38:38 +0000 | [diff] [blame] | 2 | #include "config.h" |
bellard | b9adb4a | 2003-04-29 20:41:16 +0000 | [diff] [blame] | 3 | #include "dis-asm.h" |
| 4 | #include "disas.h" |
| 5 | #include "elf.h" |
bellard | aa0aa4f | 2003-06-09 15:23:31 +0000 | [diff] [blame] | 6 | #include <errno.h> |
bellard | b9adb4a | 2003-04-29 20:41:16 +0000 | [diff] [blame] | 7 | |
| 8 | /* Filled in by elfload.c. Simplistic, but will do for now. */ |
| 9 | unsigned int disas_num_syms; |
| 10 | void *disas_symtab; |
| 11 | const char *disas_strtab; |
| 12 | |
bellard | aa0aa4f | 2003-06-09 15:23:31 +0000 | [diff] [blame] | 13 | /* Get LENGTH bytes from info's buffer, at target address memaddr. |
| 14 | Transfer them to myaddr. */ |
| 15 | int |
| 16 | buffer_read_memory (memaddr, myaddr, length, info) |
| 17 | bfd_vma memaddr; |
| 18 | bfd_byte *myaddr; |
| 19 | int length; |
| 20 | struct disassemble_info *info; |
| 21 | { |
| 22 | if (memaddr < info->buffer_vma |
| 23 | || memaddr + length > info->buffer_vma + info->buffer_length) |
| 24 | /* Out of bounds. Use EIO because GDB uses it. */ |
| 25 | return EIO; |
| 26 | memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length); |
| 27 | return 0; |
| 28 | } |
| 29 | |
| 30 | /* Print an error message. We can assume that this is in response to |
| 31 | an error return from buffer_read_memory. */ |
| 32 | void |
| 33 | perror_memory (status, memaddr, info) |
| 34 | int status; |
| 35 | bfd_vma memaddr; |
| 36 | struct disassemble_info *info; |
| 37 | { |
| 38 | if (status != EIO) |
| 39 | /* Can't happen. */ |
| 40 | (*info->fprintf_func) (info->stream, "Unknown error %d\n", status); |
| 41 | else |
| 42 | /* Actually, address between memaddr and memaddr + len was |
| 43 | out of bounds. */ |
| 44 | (*info->fprintf_func) (info->stream, |
| 45 | "Address 0x%x is out of bounds.\n", memaddr); |
| 46 | } |
| 47 | |
| 48 | /* This could be in a separate file, to save miniscule amounts of space |
| 49 | in statically linked executables. */ |
| 50 | |
| 51 | /* Just print the address is hex. This is included for completeness even |
| 52 | though both GDB and objdump provide their own (to print symbolic |
| 53 | addresses). */ |
| 54 | |
| 55 | void |
| 56 | generic_print_address (addr, info) |
| 57 | bfd_vma addr; |
| 58 | struct disassemble_info *info; |
| 59 | { |
| 60 | (*info->fprintf_func) (info->stream, "0x%x", addr); |
| 61 | } |
| 62 | |
| 63 | /* Just return the given address. */ |
| 64 | |
| 65 | int |
| 66 | generic_symbol_at_address (addr, info) |
| 67 | bfd_vma addr; |
| 68 | struct disassemble_info * info; |
| 69 | { |
| 70 | return 1; |
| 71 | } |
| 72 | |
| 73 | bfd_vma bfd_getl32 (const bfd_byte *addr) |
| 74 | { |
| 75 | unsigned long v; |
| 76 | |
| 77 | v = (unsigned long) addr[0]; |
| 78 | v |= (unsigned long) addr[1] << 8; |
| 79 | v |= (unsigned long) addr[2] << 16; |
| 80 | v |= (unsigned long) addr[3] << 24; |
| 81 | return (bfd_vma) v; |
| 82 | } |
| 83 | |
| 84 | bfd_vma bfd_getb32 (const bfd_byte *addr) |
| 85 | { |
| 86 | unsigned long v; |
| 87 | |
| 88 | v = (unsigned long) addr[0] << 24; |
| 89 | v |= (unsigned long) addr[1] << 16; |
| 90 | v |= (unsigned long) addr[2] << 8; |
| 91 | v |= (unsigned long) addr[3]; |
| 92 | return (bfd_vma) v; |
| 93 | } |
| 94 | |
bellard | 95cbfc6 | 2003-06-15 19:44:10 +0000 | [diff] [blame] | 95 | /* Disassemble this for me please... (debugging). 'flags' is only used |
| 96 | for i386: non zero means 16 bit code */ |
| 97 | void disas(FILE *out, void *code, unsigned long size, int is_host, int flags) |
bellard | b9adb4a | 2003-04-29 20:41:16 +0000 | [diff] [blame] | 98 | { |
| 99 | uint8_t *pc; |
| 100 | int count; |
| 101 | struct disassemble_info disasm_info; |
| 102 | int (*print_insn)(bfd_vma pc, disassemble_info *info); |
| 103 | |
| 104 | INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf); |
| 105 | |
| 106 | disasm_info.buffer = code; |
| 107 | disasm_info.buffer_vma = (unsigned long)code; |
| 108 | disasm_info.buffer_length = size; |
| 109 | |
bellard | 95cbfc6 | 2003-06-15 19:44:10 +0000 | [diff] [blame] | 110 | if (is_host) { |
bellard | b9adb4a | 2003-04-29 20:41:16 +0000 | [diff] [blame] | 111 | #ifdef WORDS_BIGENDIAN |
| 112 | disasm_info.endian = BFD_ENDIAN_BIG; |
| 113 | #else |
| 114 | disasm_info.endian = BFD_ENDIAN_LITTLE; |
| 115 | #endif |
| 116 | #ifdef __i386__ |
| 117 | disasm_info.mach = bfd_mach_i386_i386; |
| 118 | print_insn = print_insn_i386; |
| 119 | #elif defined(__powerpc__) |
| 120 | print_insn = print_insn_ppc; |
bellard | a993ba8 | 2003-05-11 12:25:45 +0000 | [diff] [blame] | 121 | #elif defined(__alpha__) |
| 122 | print_insn = print_insn_alpha; |
bellard | aa0aa4f | 2003-06-09 15:23:31 +0000 | [diff] [blame] | 123 | #elif defined(__sparc__) |
| 124 | print_insn = print_insn_sparc; |
| 125 | #elif defined(__arm__) |
| 126 | print_insn = print_insn_arm; |
bellard | b9adb4a | 2003-04-29 20:41:16 +0000 | [diff] [blame] | 127 | #else |
| 128 | fprintf(out, "Asm output not supported on this arch\n"); |
| 129 | return; |
| 130 | #endif |
| 131 | } else { |
bellard | 95cbfc6 | 2003-06-15 19:44:10 +0000 | [diff] [blame] | 132 | #ifdef TARGET_WORDS_BIGENDIAN |
| 133 | disasm_info.endian = BFD_ENDIAN_BIG; |
| 134 | #else |
bellard | b9adb4a | 2003-04-29 20:41:16 +0000 | [diff] [blame] | 135 | disasm_info.endian = BFD_ENDIAN_LITTLE; |
bellard | 95cbfc6 | 2003-06-15 19:44:10 +0000 | [diff] [blame] | 136 | #endif |
| 137 | #if defined(TARGET_I386) |
| 138 | if (!flags) |
bellard | b9adb4a | 2003-04-29 20:41:16 +0000 | [diff] [blame] | 139 | disasm_info.mach = bfd_mach_i386_i386; |
| 140 | else |
| 141 | disasm_info.mach = bfd_mach_i386_i8086; |
| 142 | print_insn = print_insn_i386; |
bellard | 95cbfc6 | 2003-06-15 19:44:10 +0000 | [diff] [blame] | 143 | #elif defined(TARGET_ARM) |
| 144 | print_insn = print_insn_arm; |
| 145 | #else |
| 146 | fprintf(out, "Asm output not supported on this arch\n"); |
| 147 | return; |
| 148 | #endif |
bellard | b9adb4a | 2003-04-29 20:41:16 +0000 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | for (pc = code; pc < (uint8_t *)code + size; pc += count) { |
| 152 | fprintf(out, "0x%08lx: ", (long)pc); |
bellard | aa0aa4f | 2003-06-09 15:23:31 +0000 | [diff] [blame] | 153 | #ifdef __arm__ |
| 154 | /* since data are included in the code, it is better to |
| 155 | display code data too */ |
bellard | 95cbfc6 | 2003-06-15 19:44:10 +0000 | [diff] [blame] | 156 | if (is_host) { |
bellard | aa0aa4f | 2003-06-09 15:23:31 +0000 | [diff] [blame] | 157 | fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc)); |
| 158 | } |
| 159 | #endif |
bellard | 08351fb | 2003-05-25 16:42:20 +0000 | [diff] [blame] | 160 | count = print_insn((unsigned long)pc, &disasm_info); |
bellard | b9adb4a | 2003-04-29 20:41:16 +0000 | [diff] [blame] | 161 | fprintf(out, "\n"); |
| 162 | if (count < 0) |
| 163 | break; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | /* Look up symbol for debugging purpose. Returns "" if unknown. */ |
| 168 | const char *lookup_symbol(void *orig_addr) |
| 169 | { |
| 170 | unsigned int i; |
| 171 | /* Hack, because we know this is x86. */ |
| 172 | Elf32_Sym *sym = disas_symtab; |
| 173 | |
| 174 | for (i = 0; i < disas_num_syms; i++) { |
| 175 | if (sym[i].st_shndx == SHN_UNDEF |
| 176 | || sym[i].st_shndx >= SHN_LORESERVE) |
| 177 | continue; |
| 178 | |
| 179 | if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC) |
| 180 | continue; |
| 181 | |
| 182 | if ((long)orig_addr >= sym[i].st_value |
| 183 | && (long)orig_addr < sym[i].st_value + sym[i].st_size) |
| 184 | return disas_strtab + sym[i].st_name; |
| 185 | } |
| 186 | return ""; |
| 187 | } |