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Commit | Line | Data |
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b9adb4a6 FB |
1 | /* General "disassemble this chunk" code. Used for debugging. */ |
2 | #include "dis-asm.h" | |
3 | #include "disas.h" | |
4 | #include "elf.h" | |
aa0aa4fa | 5 | #include <errno.h> |
b9adb4a6 FB |
6 | |
7 | /* Filled in by elfload.c. Simplistic, but will do for now. */ | |
8 | unsigned int disas_num_syms; | |
9 | void *disas_symtab; | |
10 | const char *disas_strtab; | |
11 | ||
aa0aa4fa FB |
12 | /* Get LENGTH bytes from info's buffer, at target address memaddr. |
13 | Transfer them to myaddr. */ | |
14 | int | |
15 | buffer_read_memory (memaddr, myaddr, length, info) | |
16 | bfd_vma memaddr; | |
17 | bfd_byte *myaddr; | |
18 | int length; | |
19 | struct disassemble_info *info; | |
20 | { | |
21 | if (memaddr < info->buffer_vma | |
22 | || memaddr + length > info->buffer_vma + info->buffer_length) | |
23 | /* Out of bounds. Use EIO because GDB uses it. */ | |
24 | return EIO; | |
25 | memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length); | |
26 | return 0; | |
27 | } | |
28 | ||
29 | /* Print an error message. We can assume that this is in response to | |
30 | an error return from buffer_read_memory. */ | |
31 | void | |
32 | perror_memory (status, memaddr, info) | |
33 | int status; | |
34 | bfd_vma memaddr; | |
35 | struct disassemble_info *info; | |
36 | { | |
37 | if (status != EIO) | |
38 | /* Can't happen. */ | |
39 | (*info->fprintf_func) (info->stream, "Unknown error %d\n", status); | |
40 | else | |
41 | /* Actually, address between memaddr and memaddr + len was | |
42 | out of bounds. */ | |
43 | (*info->fprintf_func) (info->stream, | |
44 | "Address 0x%x is out of bounds.\n", memaddr); | |
45 | } | |
46 | ||
47 | /* This could be in a separate file, to save miniscule amounts of space | |
48 | in statically linked executables. */ | |
49 | ||
50 | /* Just print the address is hex. This is included for completeness even | |
51 | though both GDB and objdump provide their own (to print symbolic | |
52 | addresses). */ | |
53 | ||
54 | void | |
55 | generic_print_address (addr, info) | |
56 | bfd_vma addr; | |
57 | struct disassemble_info *info; | |
58 | { | |
59 | (*info->fprintf_func) (info->stream, "0x%x", addr); | |
60 | } | |
61 | ||
62 | /* Just return the given address. */ | |
63 | ||
64 | int | |
65 | generic_symbol_at_address (addr, info) | |
66 | bfd_vma addr; | |
67 | struct disassemble_info * info; | |
68 | { | |
69 | return 1; | |
70 | } | |
71 | ||
72 | bfd_vma bfd_getl32 (const bfd_byte *addr) | |
73 | { | |
74 | unsigned long v; | |
75 | ||
76 | v = (unsigned long) addr[0]; | |
77 | v |= (unsigned long) addr[1] << 8; | |
78 | v |= (unsigned long) addr[2] << 16; | |
79 | v |= (unsigned long) addr[3] << 24; | |
80 | return (bfd_vma) v; | |
81 | } | |
82 | ||
83 | bfd_vma bfd_getb32 (const bfd_byte *addr) | |
84 | { | |
85 | unsigned long v; | |
86 | ||
87 | v = (unsigned long) addr[0] << 24; | |
88 | v |= (unsigned long) addr[1] << 16; | |
89 | v |= (unsigned long) addr[2] << 8; | |
90 | v |= (unsigned long) addr[3]; | |
91 | return (bfd_vma) v; | |
92 | } | |
93 | ||
b9adb4a6 FB |
94 | /* Disassemble this for me please... (debugging). */ |
95 | void disas(FILE *out, void *code, unsigned long size, enum disas_type type) | |
96 | { | |
97 | uint8_t *pc; | |
98 | int count; | |
99 | struct disassemble_info disasm_info; | |
100 | int (*print_insn)(bfd_vma pc, disassemble_info *info); | |
101 | ||
102 | INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf); | |
103 | ||
104 | disasm_info.buffer = code; | |
105 | disasm_info.buffer_vma = (unsigned long)code; | |
106 | disasm_info.buffer_length = size; | |
107 | ||
108 | if (type == DISAS_TARGET) { | |
109 | #ifdef WORDS_BIGENDIAN | |
110 | disasm_info.endian = BFD_ENDIAN_BIG; | |
111 | #else | |
112 | disasm_info.endian = BFD_ENDIAN_LITTLE; | |
113 | #endif | |
114 | #ifdef __i386__ | |
115 | disasm_info.mach = bfd_mach_i386_i386; | |
116 | print_insn = print_insn_i386; | |
117 | #elif defined(__powerpc__) | |
118 | print_insn = print_insn_ppc; | |
a993ba85 FB |
119 | #elif defined(__alpha__) |
120 | print_insn = print_insn_alpha; | |
aa0aa4fa FB |
121 | #elif defined(__sparc__) |
122 | print_insn = print_insn_sparc; | |
123 | #elif defined(__arm__) | |
124 | print_insn = print_insn_arm; | |
b9adb4a6 FB |
125 | #else |
126 | fprintf(out, "Asm output not supported on this arch\n"); | |
127 | return; | |
128 | #endif | |
129 | } else { | |
130 | /* Currently only source supported in x86. */ | |
131 | disasm_info.endian = BFD_ENDIAN_LITTLE; | |
132 | if (type == DISAS_I386_I386) | |
133 | disasm_info.mach = bfd_mach_i386_i386; | |
134 | else | |
135 | disasm_info.mach = bfd_mach_i386_i8086; | |
136 | print_insn = print_insn_i386; | |
137 | } | |
138 | ||
139 | for (pc = code; pc < (uint8_t *)code + size; pc += count) { | |
140 | fprintf(out, "0x%08lx: ", (long)pc); | |
aa0aa4fa FB |
141 | #ifdef __arm__ |
142 | /* since data are included in the code, it is better to | |
143 | display code data too */ | |
144 | if (type == DISAS_TARGET) { | |
145 | fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc)); | |
146 | } | |
147 | #endif | |
08351fb3 | 148 | count = print_insn((unsigned long)pc, &disasm_info); |
b9adb4a6 FB |
149 | fprintf(out, "\n"); |
150 | if (count < 0) | |
151 | break; | |
152 | } | |
153 | } | |
154 | ||
155 | /* Look up symbol for debugging purpose. Returns "" if unknown. */ | |
156 | const char *lookup_symbol(void *orig_addr) | |
157 | { | |
158 | unsigned int i; | |
159 | /* Hack, because we know this is x86. */ | |
160 | Elf32_Sym *sym = disas_symtab; | |
161 | ||
162 | for (i = 0; i < disas_num_syms; i++) { | |
163 | if (sym[i].st_shndx == SHN_UNDEF | |
164 | || sym[i].st_shndx >= SHN_LORESERVE) | |
165 | continue; | |
166 | ||
167 | if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC) | |
168 | continue; | |
169 | ||
170 | if ((long)orig_addr >= sym[i].st_value | |
171 | && (long)orig_addr < sym[i].st_value + sym[i].st_size) | |
172 | return disas_strtab + sym[i].st_name; | |
173 | } | |
174 | return ""; | |
175 | } |