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1 | b9adb4a6 | bellard | /* General "disassemble this chunk" code. Used for debugging. */
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2 | 5bbe9299 | bellard | #include "config.h" |
3 | b9adb4a6 | bellard | #include "dis-asm.h" |
4 | b9adb4a6 | bellard | #include "disas.h" |
5 | b9adb4a6 | bellard | #include "elf.h" |
6 | aa0aa4fa | bellard | #include <errno.h> |
7 | b9adb4a6 | bellard | |
8 | b9adb4a6 | bellard | /* Filled in by elfload.c. Simplistic, but will do for now. */
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9 | b9adb4a6 | bellard | unsigned int disas_num_syms; |
10 | b9adb4a6 | bellard | void *disas_symtab;
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11 | b9adb4a6 | bellard | const char *disas_strtab; |
12 | b9adb4a6 | bellard | |
13 | aa0aa4fa | bellard | /* Get LENGTH bytes from info's buffer, at target address memaddr.
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14 | aa0aa4fa | bellard | Transfer them to myaddr. */
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15 | aa0aa4fa | bellard | int
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16 | aa0aa4fa | bellard | buffer_read_memory (memaddr, myaddr, length, info) |
17 | aa0aa4fa | bellard | bfd_vma memaddr; |
18 | aa0aa4fa | bellard | bfd_byte *myaddr; |
19 | aa0aa4fa | bellard | int length;
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20 | aa0aa4fa | bellard | struct disassemble_info *info;
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21 | aa0aa4fa | bellard | { |
22 | aa0aa4fa | bellard | if (memaddr < info->buffer_vma
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23 | aa0aa4fa | bellard | || memaddr + length > info->buffer_vma + info->buffer_length) |
24 | aa0aa4fa | bellard | /* Out of bounds. Use EIO because GDB uses it. */
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25 | aa0aa4fa | bellard | return EIO;
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26 | aa0aa4fa | bellard | memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length); |
27 | aa0aa4fa | bellard | return 0; |
28 | aa0aa4fa | bellard | } |
29 | aa0aa4fa | bellard | |
30 | aa0aa4fa | bellard | /* Print an error message. We can assume that this is in response to
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31 | aa0aa4fa | bellard | an error return from buffer_read_memory. */
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32 | aa0aa4fa | bellard | void
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33 | aa0aa4fa | bellard | perror_memory (status, memaddr, info) |
34 | aa0aa4fa | bellard | int status;
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35 | aa0aa4fa | bellard | bfd_vma memaddr; |
36 | aa0aa4fa | bellard | struct disassemble_info *info;
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37 | aa0aa4fa | bellard | { |
38 | aa0aa4fa | bellard | if (status != EIO)
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39 | aa0aa4fa | bellard | /* Can't happen. */
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40 | aa0aa4fa | bellard | (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
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41 | aa0aa4fa | bellard | else
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42 | aa0aa4fa | bellard | /* Actually, address between memaddr and memaddr + len was
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43 | aa0aa4fa | bellard | out of bounds. */
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44 | aa0aa4fa | bellard | (*info->fprintf_func) (info->stream, |
45 | d44b29c2 | bellard | "Address 0x%llx is out of bounds.\n", memaddr);
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46 | aa0aa4fa | bellard | } |
47 | aa0aa4fa | bellard | |
48 | aa0aa4fa | bellard | /* This could be in a separate file, to save miniscule amounts of space
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49 | aa0aa4fa | bellard | in statically linked executables. */
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50 | aa0aa4fa | bellard | |
51 | aa0aa4fa | bellard | /* Just print the address is hex. This is included for completeness even
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52 | aa0aa4fa | bellard | though both GDB and objdump provide their own (to print symbolic
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53 | aa0aa4fa | bellard | addresses). */
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54 | aa0aa4fa | bellard | |
55 | aa0aa4fa | bellard | void
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56 | aa0aa4fa | bellard | generic_print_address (addr, info) |
57 | aa0aa4fa | bellard | bfd_vma addr; |
58 | aa0aa4fa | bellard | struct disassemble_info *info;
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59 | aa0aa4fa | bellard | { |
60 | d44b29c2 | bellard | (*info->fprintf_func) (info->stream, "0x%llx", addr);
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61 | aa0aa4fa | bellard | } |
62 | aa0aa4fa | bellard | |
63 | aa0aa4fa | bellard | /* Just return the given address. */
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64 | aa0aa4fa | bellard | |
65 | aa0aa4fa | bellard | int
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66 | aa0aa4fa | bellard | generic_symbol_at_address (addr, info) |
67 | aa0aa4fa | bellard | bfd_vma addr; |
68 | aa0aa4fa | bellard | struct disassemble_info * info;
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69 | aa0aa4fa | bellard | { |
70 | aa0aa4fa | bellard | return 1; |
71 | aa0aa4fa | bellard | } |
72 | aa0aa4fa | bellard | |
73 | aa0aa4fa | bellard | bfd_vma bfd_getl32 (const bfd_byte *addr)
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74 | aa0aa4fa | bellard | { |
75 | aa0aa4fa | bellard | unsigned long v; |
76 | aa0aa4fa | bellard | |
77 | aa0aa4fa | bellard | v = (unsigned long) addr[0]; |
78 | aa0aa4fa | bellard | v |= (unsigned long) addr[1] << 8; |
79 | aa0aa4fa | bellard | v |= (unsigned long) addr[2] << 16; |
80 | aa0aa4fa | bellard | v |= (unsigned long) addr[3] << 24; |
81 | aa0aa4fa | bellard | return (bfd_vma) v;
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82 | aa0aa4fa | bellard | } |
83 | aa0aa4fa | bellard | |
84 | aa0aa4fa | bellard | bfd_vma bfd_getb32 (const bfd_byte *addr)
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85 | aa0aa4fa | bellard | { |
86 | aa0aa4fa | bellard | unsigned long v; |
87 | aa0aa4fa | bellard | |
88 | aa0aa4fa | bellard | v = (unsigned long) addr[0] << 24; |
89 | aa0aa4fa | bellard | v |= (unsigned long) addr[1] << 16; |
90 | aa0aa4fa | bellard | v |= (unsigned long) addr[2] << 8; |
91 | aa0aa4fa | bellard | v |= (unsigned long) addr[3]; |
92 | aa0aa4fa | bellard | return (bfd_vma) v;
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93 | aa0aa4fa | bellard | } |
94 | aa0aa4fa | bellard | |
95 | 95cbfc64 | bellard | /* Disassemble this for me please... (debugging). 'flags' is only used
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96 | 95cbfc64 | bellard | for i386: non zero means 16 bit code */
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97 | 95cbfc64 | bellard | void disas(FILE *out, void *code, unsigned long size, int is_host, int flags) |
98 | b9adb4a6 | bellard | { |
99 | b9adb4a6 | bellard | uint8_t *pc; |
100 | b9adb4a6 | bellard | int count;
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101 | b9adb4a6 | bellard | struct disassemble_info disasm_info;
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102 | b9adb4a6 | bellard | int (*print_insn)(bfd_vma pc, disassemble_info *info);
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103 | b9adb4a6 | bellard | |
104 | b9adb4a6 | bellard | INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf); |
105 | b9adb4a6 | bellard | |
106 | b9adb4a6 | bellard | disasm_info.buffer = code; |
107 | b9adb4a6 | bellard | disasm_info.buffer_vma = (unsigned long)code; |
108 | b9adb4a6 | bellard | disasm_info.buffer_length = size; |
109 | b9adb4a6 | bellard | |
110 | 95cbfc64 | bellard | if (is_host) {
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111 | b9adb4a6 | bellard | #ifdef WORDS_BIGENDIAN
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112 | b9adb4a6 | bellard | disasm_info.endian = BFD_ENDIAN_BIG; |
113 | b9adb4a6 | bellard | #else
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114 | b9adb4a6 | bellard | disasm_info.endian = BFD_ENDIAN_LITTLE; |
115 | b9adb4a6 | bellard | #endif
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116 | b9adb4a6 | bellard | #ifdef __i386__
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117 | b9adb4a6 | bellard | disasm_info.mach = bfd_mach_i386_i386; |
118 | b9adb4a6 | bellard | print_insn = print_insn_i386; |
119 | b9adb4a6 | bellard | #elif defined(__powerpc__)
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120 | b9adb4a6 | bellard | print_insn = print_insn_ppc; |
121 | a993ba85 | bellard | #elif defined(__alpha__)
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122 | a993ba85 | bellard | print_insn = print_insn_alpha; |
123 | aa0aa4fa | bellard | #elif defined(__sparc__)
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124 | aa0aa4fa | bellard | print_insn = print_insn_sparc; |
125 | aa0aa4fa | bellard | #elif defined(__arm__)
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126 | aa0aa4fa | bellard | print_insn = print_insn_arm; |
127 | b9adb4a6 | bellard | #else
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128 | b9adb4a6 | bellard | fprintf(out, "Asm output not supported on this arch\n");
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129 | b9adb4a6 | bellard | return;
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130 | b9adb4a6 | bellard | #endif
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131 | b9adb4a6 | bellard | } else {
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132 | 95cbfc64 | bellard | #ifdef TARGET_WORDS_BIGENDIAN
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133 | 95cbfc64 | bellard | disasm_info.endian = BFD_ENDIAN_BIG; |
134 | 95cbfc64 | bellard | #else
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135 | b9adb4a6 | bellard | disasm_info.endian = BFD_ENDIAN_LITTLE; |
136 | 95cbfc64 | bellard | #endif
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137 | 95cbfc64 | bellard | #if defined(TARGET_I386)
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138 | 95cbfc64 | bellard | if (!flags)
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139 | b9adb4a6 | bellard | disasm_info.mach = bfd_mach_i386_i386; |
140 | b9adb4a6 | bellard | else
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141 | b9adb4a6 | bellard | disasm_info.mach = bfd_mach_i386_i8086; |
142 | b9adb4a6 | bellard | print_insn = print_insn_i386; |
143 | 95cbfc64 | bellard | #elif defined(TARGET_ARM)
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144 | 95cbfc64 | bellard | print_insn = print_insn_arm; |
145 | 95cbfc64 | bellard | #else
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146 | 95cbfc64 | bellard | fprintf(out, "Asm output not supported on this arch\n");
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147 | 95cbfc64 | bellard | return;
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148 | 95cbfc64 | bellard | #endif
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149 | b9adb4a6 | bellard | } |
150 | b9adb4a6 | bellard | |
151 | b9adb4a6 | bellard | for (pc = code; pc < (uint8_t *)code + size; pc += count) {
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152 | b9adb4a6 | bellard | fprintf(out, "0x%08lx: ", (long)pc); |
153 | aa0aa4fa | bellard | #ifdef __arm__
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154 | aa0aa4fa | bellard | /* since data are included in the code, it is better to
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155 | aa0aa4fa | bellard | display code data too */
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156 | 95cbfc64 | bellard | if (is_host) {
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157 | aa0aa4fa | bellard | fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc)); |
158 | aa0aa4fa | bellard | } |
159 | aa0aa4fa | bellard | #endif
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160 | 08351fb3 | bellard | count = print_insn((unsigned long)pc, &disasm_info); |
161 | b9adb4a6 | bellard | fprintf(out, "\n");
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162 | b9adb4a6 | bellard | if (count < 0) |
163 | b9adb4a6 | bellard | break;
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164 | b9adb4a6 | bellard | } |
165 | b9adb4a6 | bellard | } |
166 | b9adb4a6 | bellard | |
167 | b9adb4a6 | bellard | /* Look up symbol for debugging purpose. Returns "" if unknown. */
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168 | b9adb4a6 | bellard | const char *lookup_symbol(void *orig_addr) |
169 | b9adb4a6 | bellard | { |
170 | b9adb4a6 | bellard | unsigned int i; |
171 | b9adb4a6 | bellard | /* Hack, because we know this is x86. */
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172 | b9adb4a6 | bellard | Elf32_Sym *sym = disas_symtab; |
173 | b9adb4a6 | bellard | |
174 | b9adb4a6 | bellard | for (i = 0; i < disas_num_syms; i++) { |
175 | b9adb4a6 | bellard | if (sym[i].st_shndx == SHN_UNDEF
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176 | b9adb4a6 | bellard | || sym[i].st_shndx >= SHN_LORESERVE) |
177 | b9adb4a6 | bellard | continue;
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178 | b9adb4a6 | bellard | |
179 | b9adb4a6 | bellard | if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
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180 | b9adb4a6 | bellard | continue;
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181 | b9adb4a6 | bellard | |
182 | b9adb4a6 | bellard | if ((long)orig_addr >= sym[i].st_value |
183 | b9adb4a6 | bellard | && (long)orig_addr < sym[i].st_value + sym[i].st_size)
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184 | b9adb4a6 | bellard | return disas_strtab + sym[i].st_name;
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185 | b9adb4a6 | bellard | } |
186 | b9adb4a6 | bellard | return ""; |
187 | b9adb4a6 | bellard | } |