| 1 | /* |
| 2 | * (C) GraÅžvydas "notaz" Ignotas, 2009-2010 |
| 3 | * |
| 4 | * This work is licensed under the terms of any of these licenses |
| 5 | * (at your option): |
| 6 | * - GNU GPL, version 2 or later. |
| 7 | * - GNU LGPL, version 2.1 or later. |
| 8 | * - MAME license. |
| 9 | * See the COPYING file in the top-level directory. |
| 10 | */ |
| 11 | |
| 12 | #include <stdio.h> |
| 13 | #include <stdlib.h> |
| 14 | #include <string.h> |
| 15 | #include <stdarg.h> |
| 16 | #include <bfd.h> |
| 17 | #include <dis-asm.h> |
| 18 | |
| 19 | #include "host_dasm.h" |
| 20 | |
| 21 | extern char **g_argv; |
| 22 | |
| 23 | static struct disassemble_info di; |
| 24 | |
| 25 | #ifdef __arm__ |
| 26 | #define print_insn_func print_insn_little_arm |
| 27 | #define BFD_ARCH bfd_arch_arm |
| 28 | #define BFD_MACH bfd_mach_arm_unknown |
| 29 | #define DASM_OPTS "reg-names-std" |
| 30 | #else |
| 31 | #define print_insn_func print_insn_i386_intel |
| 32 | #define BFD_ARCH bfd_arch_i386 |
| 33 | #define BFD_MACH bfd_mach_i386_i386_intel_syntax |
| 34 | #define DASM_OPTS NULL |
| 35 | #endif |
| 36 | |
| 37 | /* symbols */ |
| 38 | static asymbol **symbols; |
| 39 | static long symcount, symstorage; |
| 40 | static int init_done; |
| 41 | |
| 42 | /* Filter out (in place) symbols that are useless for disassembly. |
| 43 | COUNT is the number of elements in SYMBOLS. |
| 44 | Return the number of useful symbols. */ |
| 45 | static long |
| 46 | remove_useless_symbols (asymbol **symbols, long count) |
| 47 | { |
| 48 | asymbol **in_ptr = symbols, **out_ptr = symbols; |
| 49 | |
| 50 | while (--count >= 0) |
| 51 | { |
| 52 | asymbol *sym = *in_ptr++; |
| 53 | |
| 54 | if (sym->name == NULL || sym->name[0] == '\0' || sym->name[0] == '$') |
| 55 | continue; |
| 56 | if (sym->flags & (BSF_DEBUGGING | BSF_SECTION_SYM)) |
| 57 | continue; |
| 58 | if (bfd_is_und_section (sym->section) |
| 59 | || bfd_is_com_section (sym->section)) |
| 60 | continue; |
| 61 | if (sym->value + sym->section->vma == 0) |
| 62 | continue; |
| 63 | /* |
| 64 | printf("sym: %08lx %04x %08x v %08x \"%s\"\n", |
| 65 | (unsigned int)sym->value, (unsigned int)sym->flags, (unsigned int)sym->udata.i, |
| 66 | (unsigned int)sym->section->vma, sym->name); |
| 67 | */ |
| 68 | *out_ptr++ = sym; |
| 69 | } |
| 70 | |
| 71 | return out_ptr - symbols; |
| 72 | } |
| 73 | |
| 74 | static void slurp_symtab(const char *filename) |
| 75 | { |
| 76 | bfd *abfd; |
| 77 | |
| 78 | symcount = 0; |
| 79 | |
| 80 | abfd = bfd_openr(filename, NULL); |
| 81 | if (abfd == NULL) { |
| 82 | fprintf(stderr, "failed to open: %s\n", filename); |
| 83 | goto no_symbols; |
| 84 | } |
| 85 | |
| 86 | if (!bfd_check_format(abfd, bfd_object)) |
| 87 | goto no_symbols; |
| 88 | |
| 89 | if (!(bfd_get_file_flags(abfd) & HAS_SYMS)) |
| 90 | goto no_symbols; |
| 91 | |
| 92 | symstorage = bfd_get_symtab_upper_bound(abfd); |
| 93 | if (symstorage <= 0) |
| 94 | goto no_symbols; |
| 95 | |
| 96 | symbols = malloc(symstorage); |
| 97 | if (symbols == NULL) |
| 98 | goto no_symbols; |
| 99 | |
| 100 | symcount = bfd_canonicalize_symtab(abfd, symbols); |
| 101 | if (symcount < 0) |
| 102 | goto no_symbols; |
| 103 | |
| 104 | symcount = remove_useless_symbols(symbols, symcount); |
| 105 | // bfd_close(abfd); |
| 106 | return; |
| 107 | |
| 108 | no_symbols: |
| 109 | fprintf(stderr, "no symbols in %s\n", bfd_get_filename(abfd)); |
| 110 | if (symbols != NULL) |
| 111 | free(symbols); |
| 112 | symbols = NULL; |
| 113 | if (abfd != NULL) |
| 114 | bfd_close(abfd); |
| 115 | } |
| 116 | |
| 117 | static const char *lookup_name(bfd_vma addr) |
| 118 | { |
| 119 | asymbol **sptr = symbols; |
| 120 | int i; |
| 121 | |
| 122 | for (i = 0; i < symcount; i++) { |
| 123 | asymbol *sym = *sptr++; |
| 124 | |
| 125 | if (addr == sym->value + sym->section->vma) |
| 126 | return sym->name; |
| 127 | } |
| 128 | |
| 129 | return NULL; |
| 130 | } |
| 131 | |
| 132 | /* Like target_read_memory, but slightly different parameters. */ |
| 133 | static int |
| 134 | dis_asm_read_memory(bfd_vma memaddr, bfd_byte *myaddr, unsigned int len, |
| 135 | struct disassemble_info *info) |
| 136 | { |
| 137 | memcpy(myaddr, (void *)(int)memaddr, len); |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | static void |
| 142 | dis_asm_memory_error(int status, bfd_vma memaddr, |
| 143 | struct disassemble_info *info) |
| 144 | { |
| 145 | fprintf(stderr, "memory_error %p\n", (void *)(int)memaddr); |
| 146 | } |
| 147 | |
| 148 | static void |
| 149 | dis_asm_print_address(bfd_vma addr, struct disassemble_info *info) |
| 150 | { |
| 151 | const char *name; |
| 152 | |
| 153 | printf("%08x", (int)addr); |
| 154 | |
| 155 | name = lookup_name(addr); |
| 156 | if (name != NULL) |
| 157 | printf(" <%s>", name); |
| 158 | } |
| 159 | |
| 160 | static int insn_printf(void *f, const char *format, ...) |
| 161 | { |
| 162 | va_list args; |
| 163 | size_t n; |
| 164 | |
| 165 | va_start(args, format); |
| 166 | n = vprintf(format, args); |
| 167 | va_end(args); |
| 168 | |
| 169 | return n; |
| 170 | } |
| 171 | |
| 172 | static void host_dasm_init(void) |
| 173 | { |
| 174 | bfd_init(); |
| 175 | slurp_symtab(g_argv[0]); |
| 176 | |
| 177 | init_disassemble_info(&di, NULL, insn_printf); |
| 178 | di.flavour = bfd_target_unknown_flavour; |
| 179 | di.memory_error_func = dis_asm_memory_error; |
| 180 | di.print_address_func = dis_asm_print_address; |
| 181 | // di.symbol_at_address_func = dis_asm_symbol_at_address; |
| 182 | di.read_memory_func = dis_asm_read_memory; |
| 183 | di.arch = BFD_ARCH; |
| 184 | di.mach = BFD_MACH; |
| 185 | di.endian = BFD_ENDIAN_LITTLE; |
| 186 | di.disassembler_options = DASM_OPTS; |
| 187 | disassemble_init_for_target(&di); |
| 188 | init_done = 1; |
| 189 | } |
| 190 | |
| 191 | void host_dasm(void *addr, int len) |
| 192 | { |
| 193 | bfd_vma vma_end, vma = (bfd_vma)(long)addr; |
| 194 | const char *name; |
| 195 | |
| 196 | if (!init_done) |
| 197 | host_dasm_init(); |
| 198 | |
| 199 | vma_end = vma + len; |
| 200 | while (vma < vma_end) { |
| 201 | name = lookup_name(vma); |
| 202 | if (name != NULL) |
| 203 | printf("%s:\n", name); |
| 204 | |
| 205 | printf(" %08lx ", (long)vma); |
| 206 | vma += print_insn_func(vma, &di); |
| 207 | printf("\n"); |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | void host_dasm_new_symbol_(void *addr, const char *name) |
| 212 | { |
| 213 | bfd_vma vma = (bfd_vma)(long)addr; |
| 214 | asymbol *sym, **tmp; |
| 215 | |
| 216 | if (!init_done) |
| 217 | host_dasm_init(); |
| 218 | if (symbols == NULL) |
| 219 | return; |
| 220 | if (symstorage <= symcount * sizeof(symbols[0])) { |
| 221 | tmp = realloc(symbols, symstorage * 2); |
| 222 | if (tmp == NULL) |
| 223 | return; |
| 224 | symstorage *= 2; |
| 225 | symbols = tmp; |
| 226 | } |
| 227 | |
| 228 | symbols[symcount] = calloc(sizeof(*symbols[0]), 1); |
| 229 | if (symbols[symcount] == NULL) |
| 230 | return; |
| 231 | |
| 232 | // a HACK (should use correct section), but ohwell |
| 233 | sym = symbols[symcount]; |
| 234 | sym->section = symbols[0]->section; |
| 235 | sym->value = vma - sym->section->vma; |
| 236 | sym->name = name; |
| 237 | symcount++; |
| 238 | } |
| 239 | |