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 |
28 | #define BFD_MACH bfd_mach_arm_4T |
29 | #else |
30 | #define print_insn_func print_insn_i386_intel |
31 | #define BFD_ARCH bfd_arch_i386 |
32 | #define BFD_MACH bfd_mach_i386_i386_intel_syntax |
33 | #endif |
34 | |
aad81ad9 |
35 | /* symbols */ |
36 | static asymbol **symbols; |
e8fc349e |
37 | static long symcount, symstorage; |
38 | static int init_done; |
aad81ad9 |
39 | |
40 | /* Filter out (in place) symbols that are useless for disassembly. |
41 | COUNT is the number of elements in SYMBOLS. |
42 | Return the number of useful symbols. */ |
43 | static long |
44 | remove_useless_symbols (asymbol **symbols, long count) |
45 | { |
46 | asymbol **in_ptr = symbols, **out_ptr = symbols; |
47 | |
48 | while (--count >= 0) |
49 | { |
50 | asymbol *sym = *in_ptr++; |
51 | |
ebc9df9f |
52 | if (sym->name == NULL || sym->name[0] == '\0' || sym->name[0] == '$') |
aad81ad9 |
53 | continue; |
54 | if (sym->flags & (BSF_DEBUGGING | BSF_SECTION_SYM)) |
55 | continue; |
56 | if (bfd_is_und_section (sym->section) |
57 | || bfd_is_com_section (sym->section)) |
58 | continue; |
59 | if (sym->value + sym->section->vma == 0) |
60 | continue; |
61 | /* |
62 | printf("sym: %08lx %04x %08x v %08x \"%s\"\n", |
63 | (unsigned int)sym->value, (unsigned int)sym->flags, (unsigned int)sym->udata.i, |
64 | (unsigned int)sym->section->vma, sym->name); |
65 | */ |
66 | *out_ptr++ = sym; |
67 | } |
ebc9df9f |
68 | |
aad81ad9 |
69 | return out_ptr - symbols; |
70 | } |
71 | |
72 | static void slurp_symtab(const char *filename) |
73 | { |
74 | bfd *abfd; |
aad81ad9 |
75 | |
76 | symcount = 0; |
77 | |
78 | abfd = bfd_openr(filename, NULL); |
79 | if (abfd == NULL) { |
80 | fprintf(stderr, "failed to open: %s\n", filename); |
81 | goto no_symbols; |
82 | } |
83 | |
84 | if (!bfd_check_format(abfd, bfd_object)) |
85 | goto no_symbols; |
86 | |
87 | if (!(bfd_get_file_flags(abfd) & HAS_SYMS)) |
88 | goto no_symbols; |
89 | |
e8fc349e |
90 | symstorage = bfd_get_symtab_upper_bound(abfd); |
91 | if (symstorage <= 0) |
92 | goto no_symbols; |
93 | |
94 | symbols = malloc(symstorage); |
95 | if (symbols == NULL) |
aad81ad9 |
96 | goto no_symbols; |
97 | |
aad81ad9 |
98 | symcount = bfd_canonicalize_symtab(abfd, symbols); |
99 | if (symcount < 0) |
100 | goto no_symbols; |
101 | |
102 | symcount = remove_useless_symbols(symbols, symcount); |
103 | // bfd_close(abfd); |
104 | return; |
105 | |
106 | no_symbols: |
107 | fprintf(stderr, "no symbols in %s\n", bfd_get_filename(abfd)); |
e8fc349e |
108 | if (symbols != NULL) |
109 | free(symbols); |
110 | symbols = NULL; |
aad81ad9 |
111 | if (abfd != NULL) |
112 | bfd_close(abfd); |
113 | } |
114 | |
e8fc349e |
115 | static const char *lookup_name(bfd_vma addr) |
116 | { |
117 | asymbol **sptr = symbols; |
118 | int i; |
119 | |
120 | for (i = 0; i < symcount; i++) { |
121 | asymbol *sym = *sptr++; |
122 | |
123 | if (addr == sym->value + sym->section->vma) |
124 | return sym->name; |
125 | } |
126 | |
127 | return NULL; |
128 | } |
aad81ad9 |
129 | |
130 | /* Like target_read_memory, but slightly different parameters. */ |
131 | static int |
132 | dis_asm_read_memory(bfd_vma memaddr, bfd_byte *myaddr, unsigned int len, |
133 | struct disassemble_info *info) |
134 | { |
135 | memcpy(myaddr, (void *)(int)memaddr, len); |
136 | return 0; |
137 | } |
138 | |
139 | static void |
140 | dis_asm_memory_error(int status, bfd_vma memaddr, |
141 | struct disassemble_info *info) |
142 | { |
143 | fprintf(stderr, "memory_error %p\n", (void *)(int)memaddr); |
144 | } |
145 | |
146 | static void |
147 | dis_asm_print_address(bfd_vma addr, struct disassemble_info *info) |
148 | { |
e8fc349e |
149 | const char *name; |
aad81ad9 |
150 | |
151 | printf("%08x", (int)addr); |
152 | |
e8fc349e |
153 | name = lookup_name(addr); |
154 | if (name != NULL) |
155 | printf(" <%s>", name); |
aad81ad9 |
156 | } |
157 | |
158 | static int insn_printf(void *f, const char *format, ...) |
159 | { |
160 | va_list args; |
161 | size_t n; |
162 | |
163 | va_start(args, format); |
164 | n = vprintf(format, args); |
165 | va_end(args); |
166 | |
167 | return n; |
168 | } |
169 | |
170 | static void host_dasm_init(void) |
171 | { |
61d87c7e |
172 | bfd_init(); |
aad81ad9 |
173 | slurp_symtab(g_argv[0]); |
174 | |
175 | init_disassemble_info(&di, NULL, insn_printf); |
176 | di.flavour = bfd_target_unknown_flavour; |
177 | di.memory_error_func = dis_asm_memory_error; |
178 | di.print_address_func = dis_asm_print_address; |
179 | // di.symbol_at_address_func = dis_asm_symbol_at_address; |
180 | di.read_memory_func = dis_asm_read_memory; |
6ad8f1d6 |
181 | di.arch = BFD_ARCH; |
182 | di.mach = BFD_MACH; |
aad81ad9 |
183 | di.endian = BFD_ENDIAN_LITTLE; |
184 | disassemble_init_for_target(&di); |
e8fc349e |
185 | init_done = 1; |
aad81ad9 |
186 | } |
187 | |
188 | void host_dasm(void *addr, int len) |
189 | { |
e8fc349e |
190 | bfd_vma vma_end, vma = (bfd_vma)(long)addr; |
191 | const char *name; |
aad81ad9 |
192 | |
e8fc349e |
193 | if (!init_done) |
aad81ad9 |
194 | host_dasm_init(); |
aad81ad9 |
195 | |
196 | vma_end = vma + len; |
197 | while (vma < vma_end) { |
e8fc349e |
198 | name = lookup_name(vma); |
199 | if (name != NULL) |
200 | printf("%s:\n", name); |
201 | |
82d64b3a |
202 | printf(" %08lx ", (long)vma); |
6ad8f1d6 |
203 | vma += print_insn_func(vma, &di); |
aad81ad9 |
204 | printf("\n"); |
205 | } |
206 | } |
207 | |
e8fc349e |
208 | void host_dasm_new_symbol_(void *addr, const char *name) |
209 | { |
210 | bfd_vma vma = (bfd_vma)(long)addr; |
211 | asymbol *sym, **tmp; |
212 | |
213 | if (!init_done) |
214 | host_dasm_init(); |
215 | if (symbols == NULL) |
216 | return; |
217 | if (symstorage <= symcount * sizeof(symbols[0])) { |
218 | tmp = realloc(symbols, symstorage * 2); |
219 | if (tmp == NULL) |
220 | return; |
221 | symstorage *= 2; |
222 | symbols = tmp; |
223 | } |
224 | |
225 | symbols[symcount] = calloc(sizeof(*symbols[0]), 1); |
226 | if (symbols[symcount] == NULL) |
227 | return; |
228 | |
229 | // a HACK (should use correct section), but ohwell |
230 | sym = symbols[symcount]; |
231 | sym->section = symbols[0]->section; |
232 | sym->value = vma - sym->section->vma; |
233 | sym->name = name; |
234 | symcount++; |
235 | } |
236 | |