f89d8471 |
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 | |
aad81ad9 |
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 | |
f89d8471 |
25 | #ifdef __arm__ |
6ad8f1d6 |
26 | #define print_insn_func print_insn_little_arm |
27 | #define BFD_ARCH bfd_arch_arm |
c54d04fd |
28 | #define BFD_MACH bfd_mach_arm_unknown |
29 | #define DASM_OPTS "reg-names-std" |
6ad8f1d6 |
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 |
c54d04fd |
34 | #define DASM_OPTS NULL |
6ad8f1d6 |
35 | #endif |
36 | |
aad81ad9 |
37 | /* symbols */ |
38 | static asymbol **symbols; |
e8fc349e |
39 | static long symcount, symstorage; |
40 | static int init_done; |
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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 | |
ebc9df9f |
54 | if (sym->name == NULL || sym->name[0] == '\0' || sym->name[0] == '$') |
aad81ad9 |
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 | } |
ebc9df9f |
70 | |
aad81ad9 |
71 | return out_ptr - symbols; |
72 | } |
73 | |
74 | static void slurp_symtab(const char *filename) |
75 | { |
76 | bfd *abfd; |
aad81ad9 |
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 | |
e8fc349e |
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) |
aad81ad9 |
98 | goto no_symbols; |
99 | |
aad81ad9 |
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)); |
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110 | if (symbols != NULL) |
111 | free(symbols); |
112 | symbols = NULL; |
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113 | if (abfd != NULL) |
114 | bfd_close(abfd); |
115 | } |
116 | |
e8fc349e |
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 | } |
aad81ad9 |
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 | { |
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151 | const char *name; |
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152 | |
153 | printf("%08x", (int)addr); |
154 | |
e8fc349e |
155 | name = lookup_name(addr); |
156 | if (name != NULL) |
157 | printf(" <%s>", name); |
aad81ad9 |
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 | { |
61d87c7e |
174 | bfd_init(); |
aad81ad9 |
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; |
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183 | di.arch = BFD_ARCH; |
184 | di.mach = BFD_MACH; |
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185 | di.endian = BFD_ENDIAN_LITTLE; |
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186 | di.disassembler_options = DASM_OPTS; |
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187 | disassemble_init_for_target(&di); |
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188 | init_done = 1; |
aad81ad9 |
189 | } |
190 | |
191 | void host_dasm(void *addr, int len) |
192 | { |
e8fc349e |
193 | bfd_vma vma_end, vma = (bfd_vma)(long)addr; |
194 | const char *name; |
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195 | |
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196 | if (!init_done) |
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197 | host_dasm_init(); |
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198 | |
199 | vma_end = vma + len; |
200 | while (vma < vma_end) { |
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201 | name = lookup_name(vma); |
202 | if (name != NULL) |
203 | printf("%s:\n", name); |
204 | |
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205 | printf(" %08lx ", (long)vma); |
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206 | vma += print_insn_func(vma, &di); |
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207 | printf("\n"); |
208 | } |
209 | } |
210 | |
e8fc349e |
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 | |