cff531af |
1 | /* |
2 | * PicoDrive |
3 | * (C) notaz, 2009,2010 |
4 | * |
5 | * This work is licensed under the terms of MAME license. |
6 | * See COPYING file in the top-level directory. |
7 | */ |
679af8a3 |
8 | #include <stdio.h> |
9 | #include <stdlib.h> |
10 | #include <string.h> |
11 | #include <stdarg.h> |
12 | #include <bfd.h> |
13 | #include <dis-asm.h> |
14 | |
15 | #include "host_dasm.h" |
16 | |
17 | extern char **g_argv; |
18 | |
19 | static struct disassemble_info di; |
20 | |
d4d62665 |
21 | #ifdef __arm__ |
65c75cb0 |
22 | #define print_insn_func print_insn_little_arm |
23 | #define BFD_ARCH bfd_arch_arm |
24 | #define BFD_MACH bfd_mach_arm_4T |
25 | #else |
26 | #define print_insn_func print_insn_i386_intel |
27 | #define BFD_ARCH bfd_arch_i386 |
28 | #define BFD_MACH bfd_mach_i386_i386_intel_syntax |
29 | #endif |
30 | |
679af8a3 |
31 | /* symbols */ |
32 | static asymbol **symbols; |
efd100fc |
33 | static long symcount, symstorage; |
34 | static int init_done; |
679af8a3 |
35 | |
36 | /* Filter out (in place) symbols that are useless for disassembly. |
37 | COUNT is the number of elements in SYMBOLS. |
38 | Return the number of useful symbols. */ |
39 | static long |
40 | remove_useless_symbols (asymbol **symbols, long count) |
41 | { |
42 | asymbol **in_ptr = symbols, **out_ptr = symbols; |
43 | |
44 | while (--count >= 0) |
45 | { |
46 | asymbol *sym = *in_ptr++; |
47 | |
553c3eaa |
48 | if (sym->name == NULL || sym->name[0] == '\0' || sym->name[0] == '$') |
679af8a3 |
49 | continue; |
50 | if (sym->flags & (BSF_DEBUGGING | BSF_SECTION_SYM)) |
51 | continue; |
52 | if (bfd_is_und_section (sym->section) |
53 | || bfd_is_com_section (sym->section)) |
54 | continue; |
55 | if (sym->value + sym->section->vma == 0) |
56 | continue; |
57 | /* |
58 | printf("sym: %08lx %04x %08x v %08x \"%s\"\n", |
59 | (unsigned int)sym->value, (unsigned int)sym->flags, (unsigned int)sym->udata.i, |
60 | (unsigned int)sym->section->vma, sym->name); |
61 | */ |
62 | *out_ptr++ = sym; |
63 | } |
553c3eaa |
64 | |
679af8a3 |
65 | return out_ptr - symbols; |
66 | } |
67 | |
68 | static void slurp_symtab(const char *filename) |
69 | { |
70 | bfd *abfd; |
679af8a3 |
71 | |
72 | symcount = 0; |
73 | |
74 | abfd = bfd_openr(filename, NULL); |
75 | if (abfd == NULL) { |
76 | fprintf(stderr, "failed to open: %s\n", filename); |
77 | goto no_symbols; |
78 | } |
79 | |
80 | if (!bfd_check_format(abfd, bfd_object)) |
81 | goto no_symbols; |
82 | |
83 | if (!(bfd_get_file_flags(abfd) & HAS_SYMS)) |
84 | goto no_symbols; |
85 | |
efd100fc |
86 | symstorage = bfd_get_symtab_upper_bound(abfd); |
87 | if (symstorage <= 0) |
88 | goto no_symbols; |
89 | |
90 | symbols = malloc(symstorage); |
91 | if (symbols == NULL) |
679af8a3 |
92 | goto no_symbols; |
93 | |
679af8a3 |
94 | symcount = bfd_canonicalize_symtab(abfd, symbols); |
95 | if (symcount < 0) |
96 | goto no_symbols; |
97 | |
98 | symcount = remove_useless_symbols(symbols, symcount); |
99 | // bfd_close(abfd); |
100 | return; |
101 | |
102 | no_symbols: |
103 | fprintf(stderr, "no symbols in %s\n", bfd_get_filename(abfd)); |
efd100fc |
104 | if (symbols != NULL) |
105 | free(symbols); |
106 | symbols = NULL; |
679af8a3 |
107 | if (abfd != NULL) |
108 | bfd_close(abfd); |
109 | } |
110 | |
efd100fc |
111 | static const char *lookup_name(bfd_vma addr) |
112 | { |
113 | asymbol **sptr = symbols; |
114 | int i; |
115 | |
116 | for (i = 0; i < symcount; i++) { |
117 | asymbol *sym = *sptr++; |
118 | |
119 | if (addr == sym->value + sym->section->vma) |
120 | return sym->name; |
121 | } |
122 | |
123 | return NULL; |
124 | } |
679af8a3 |
125 | |
126 | /* Like target_read_memory, but slightly different parameters. */ |
127 | static int |
128 | dis_asm_read_memory(bfd_vma memaddr, bfd_byte *myaddr, unsigned int len, |
129 | struct disassemble_info *info) |
130 | { |
131 | memcpy(myaddr, (void *)(int)memaddr, len); |
132 | return 0; |
133 | } |
134 | |
135 | static void |
136 | dis_asm_memory_error(int status, bfd_vma memaddr, |
137 | struct disassemble_info *info) |
138 | { |
139 | fprintf(stderr, "memory_error %p\n", (void *)(int)memaddr); |
140 | } |
141 | |
142 | static void |
143 | dis_asm_print_address(bfd_vma addr, struct disassemble_info *info) |
144 | { |
efd100fc |
145 | const char *name; |
679af8a3 |
146 | |
147 | printf("%08x", (int)addr); |
148 | |
efd100fc |
149 | name = lookup_name(addr); |
150 | if (name != NULL) |
151 | printf(" <%s>", name); |
679af8a3 |
152 | } |
153 | |
154 | static int insn_printf(void *f, const char *format, ...) |
155 | { |
156 | va_list args; |
157 | size_t n; |
158 | |
159 | va_start(args, format); |
160 | n = vprintf(format, args); |
161 | va_end(args); |
162 | |
163 | return n; |
164 | } |
165 | |
166 | static void host_dasm_init(void) |
167 | { |
8796b7ee |
168 | bfd_init(); |
679af8a3 |
169 | slurp_symtab(g_argv[0]); |
170 | |
171 | init_disassemble_info(&di, NULL, insn_printf); |
172 | di.flavour = bfd_target_unknown_flavour; |
173 | di.memory_error_func = dis_asm_memory_error; |
174 | di.print_address_func = dis_asm_print_address; |
175 | // di.symbol_at_address_func = dis_asm_symbol_at_address; |
176 | di.read_memory_func = dis_asm_read_memory; |
65c75cb0 |
177 | di.arch = BFD_ARCH; |
178 | di.mach = BFD_MACH; |
679af8a3 |
179 | di.endian = BFD_ENDIAN_LITTLE; |
180 | disassemble_init_for_target(&di); |
efd100fc |
181 | init_done = 1; |
679af8a3 |
182 | } |
183 | |
184 | void host_dasm(void *addr, int len) |
185 | { |
efd100fc |
186 | bfd_vma vma_end, vma = (bfd_vma)(long)addr; |
187 | const char *name; |
679af8a3 |
188 | |
efd100fc |
189 | if (!init_done) |
679af8a3 |
190 | host_dasm_init(); |
679af8a3 |
191 | |
192 | vma_end = vma + len; |
193 | while (vma < vma_end) { |
efd100fc |
194 | name = lookup_name(vma); |
195 | if (name != NULL) |
196 | printf("%s:\n", name); |
197 | |
5686d931 |
198 | printf(" %08lx ", (long)vma); |
65c75cb0 |
199 | vma += print_insn_func(vma, &di); |
679af8a3 |
200 | printf("\n"); |
201 | } |
202 | } |
203 | |
efd100fc |
204 | void host_dasm_new_symbol_(void *addr, const char *name) |
205 | { |
206 | bfd_vma vma = (bfd_vma)(long)addr; |
207 | asymbol *sym, **tmp; |
208 | |
209 | if (!init_done) |
210 | host_dasm_init(); |
211 | if (symbols == NULL) |
212 | return; |
213 | if (symstorage <= symcount * sizeof(symbols[0])) { |
214 | tmp = realloc(symbols, symstorage * 2); |
215 | if (tmp == NULL) |
216 | return; |
217 | symstorage *= 2; |
218 | symbols = tmp; |
219 | } |
220 | |
221 | symbols[symcount] = calloc(sizeof(*symbols[0]), 1); |
222 | if (symbols[symcount] == NULL) |
223 | return; |
224 | |
225 | // a HACK (should use correct section), but ohwell |
226 | sym = symbols[symcount]; |
227 | sym->section = symbols[0]->section; |
228 | sym->value = vma - sym->section->vma; |
229 | sym->name = name; |
230 | symcount++; |
231 | } |
232 | |