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1 | /* General "disassemble this chunk" code. Used for debugging. */ | |
2 | #include "config.h" | |
3 | #include "dis-asm.h" | |
4 | #include "elf.h" | |
5 | #include <errno.h> | |
6 | ||
7 | #include "cpu.h" | |
8 | #include "exec-all.h" | |
9 | #include "disas.h" | |
10 | ||
11 | /* Filled in by elfload.c. Simplistic, but will do for now. */ | |
12 | unsigned int disas_num_syms; | |
13 | void *disas_symtab; | |
14 | const char *disas_strtab; | |
15 | ||
16 | /* Get LENGTH bytes from info's buffer, at target address memaddr. | |
17 | Transfer them to myaddr. */ | |
18 | int | |
19 | buffer_read_memory (memaddr, myaddr, length, info) | |
20 | bfd_vma memaddr; | |
21 | bfd_byte *myaddr; | |
22 | int length; | |
23 | struct disassemble_info *info; | |
24 | { | |
25 | if (memaddr < info->buffer_vma | |
26 | || memaddr + length > info->buffer_vma + info->buffer_length) | |
27 | /* Out of bounds. Use EIO because GDB uses it. */ | |
28 | return EIO; | |
29 | memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length); | |
30 | return 0; | |
31 | } | |
32 | ||
33 | #if !defined(CONFIG_USER_ONLY) | |
34 | /* Get LENGTH bytes from info's buffer, at target address memaddr. | |
35 | Transfer them to myaddr. */ | |
36 | static int | |
37 | target_read_memory (memaddr, myaddr, length, info) | |
38 | bfd_vma memaddr; | |
39 | bfd_byte *myaddr; | |
40 | int length; | |
41 | struct disassemble_info *info; | |
42 | { | |
43 | int i; | |
44 | for(i = 0; i < length; i++) { | |
45 | myaddr[i] = ldub_code((void *)((long)memaddr + i)); | |
46 | } | |
47 | return 0; | |
48 | } | |
49 | #endif | |
50 | ||
51 | /* Print an error message. We can assume that this is in response to | |
52 | an error return from buffer_read_memory. */ | |
53 | void | |
54 | perror_memory (status, memaddr, info) | |
55 | int status; | |
56 | bfd_vma memaddr; | |
57 | struct disassemble_info *info; | |
58 | { | |
59 | if (status != EIO) | |
60 | /* Can't happen. */ | |
61 | (*info->fprintf_func) (info->stream, "Unknown error %d\n", status); | |
62 | else | |
63 | /* Actually, address between memaddr and memaddr + len was | |
64 | out of bounds. */ | |
65 | (*info->fprintf_func) (info->stream, | |
66 | "Address 0x%llx is out of bounds.\n", memaddr); | |
67 | } | |
68 | ||
69 | /* This could be in a separate file, to save miniscule amounts of space | |
70 | in statically linked executables. */ | |
71 | ||
72 | /* Just print the address is hex. This is included for completeness even | |
73 | though both GDB and objdump provide their own (to print symbolic | |
74 | addresses). */ | |
75 | ||
76 | void | |
77 | generic_print_address (addr, info) | |
78 | bfd_vma addr; | |
79 | struct disassemble_info *info; | |
80 | { | |
81 | (*info->fprintf_func) (info->stream, "0x%llx", addr); | |
82 | } | |
83 | ||
84 | /* Just return the given address. */ | |
85 | ||
86 | int | |
87 | generic_symbol_at_address (addr, info) | |
88 | bfd_vma addr; | |
89 | struct disassemble_info * info; | |
90 | { | |
91 | return 1; | |
92 | } | |
93 | ||
94 | bfd_vma bfd_getl32 (const bfd_byte *addr) | |
95 | { | |
96 | unsigned long v; | |
97 | ||
98 | v = (unsigned long) addr[0]; | |
99 | v |= (unsigned long) addr[1] << 8; | |
100 | v |= (unsigned long) addr[2] << 16; | |
101 | v |= (unsigned long) addr[3] << 24; | |
102 | return (bfd_vma) v; | |
103 | } | |
104 | ||
105 | bfd_vma bfd_getb32 (const bfd_byte *addr) | |
106 | { | |
107 | unsigned long v; | |
108 | ||
109 | v = (unsigned long) addr[0] << 24; | |
110 | v |= (unsigned long) addr[1] << 16; | |
111 | v |= (unsigned long) addr[2] << 8; | |
112 | v |= (unsigned long) addr[3]; | |
113 | return (bfd_vma) v; | |
114 | } | |
115 | ||
116 | /* Disassemble this for me please... (debugging). 'flags' is only used | |
117 | for i386: non zero means 16 bit code */ | |
118 | void disas(FILE *out, void *code, unsigned long size, int is_host, int flags) | |
119 | { | |
120 | uint8_t *pc; | |
121 | int count; | |
122 | struct disassemble_info disasm_info; | |
123 | int (*print_insn)(bfd_vma pc, disassemble_info *info); | |
124 | ||
125 | INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf); | |
126 | ||
127 | #if !defined(CONFIG_USER_ONLY) | |
128 | if (!is_host) { | |
129 | disasm_info.read_memory_func = target_read_memory; | |
130 | } | |
131 | #endif | |
132 | ||
133 | disasm_info.buffer = code; | |
134 | disasm_info.buffer_vma = (unsigned long)code; | |
135 | disasm_info.buffer_length = size; | |
136 | ||
137 | if (is_host) { | |
138 | #ifdef WORDS_BIGENDIAN | |
139 | disasm_info.endian = BFD_ENDIAN_BIG; | |
140 | #else | |
141 | disasm_info.endian = BFD_ENDIAN_LITTLE; | |
142 | #endif | |
143 | #if defined(__i386__) | |
144 | disasm_info.mach = bfd_mach_i386_i386; | |
145 | print_insn = print_insn_i386; | |
146 | #elif defined(__x86_64__) | |
147 | disasm_info.mach = bfd_mach_x86_64; | |
148 | print_insn = print_insn_i386; | |
149 | #elif defined(__powerpc__) | |
150 | print_insn = print_insn_ppc; | |
151 | #elif defined(__alpha__) | |
152 | print_insn = print_insn_alpha; | |
153 | #elif defined(__sparc__) | |
154 | print_insn = print_insn_sparc; | |
155 | #elif defined(__arm__) | |
156 | print_insn = print_insn_arm; | |
157 | #else | |
158 | fprintf(out, "Asm output not supported on this arch\n"); | |
159 | return; | |
160 | #endif | |
161 | } else { | |
162 | #ifdef TARGET_WORDS_BIGENDIAN | |
163 | disasm_info.endian = BFD_ENDIAN_BIG; | |
164 | #else | |
165 | disasm_info.endian = BFD_ENDIAN_LITTLE; | |
166 | #endif | |
167 | #if defined(TARGET_I386) | |
168 | if (!flags) | |
169 | disasm_info.mach = bfd_mach_i386_i386; | |
170 | else | |
171 | disasm_info.mach = bfd_mach_i386_i8086; | |
172 | print_insn = print_insn_i386; | |
173 | #elif defined(TARGET_ARM) | |
174 | print_insn = print_insn_arm; | |
175 | #elif defined(TARGET_SPARC) | |
176 | print_insn = print_insn_sparc; | |
177 | #elif defined(TARGET_PPC) | |
178 | print_insn = print_insn_ppc; | |
179 | #else | |
180 | fprintf(out, "Asm output not supported on this arch\n"); | |
181 | return; | |
182 | #endif | |
183 | } | |
184 | ||
185 | for (pc = code; pc < (uint8_t *)code + size; pc += count) { | |
186 | fprintf(out, "0x%08lx: ", (long)pc); | |
187 | #ifdef __arm__ | |
188 | /* since data are included in the code, it is better to | |
189 | display code data too */ | |
190 | if (is_host) { | |
191 | fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc)); | |
192 | } | |
193 | #endif | |
194 | count = print_insn((unsigned long)pc, &disasm_info); | |
195 | fprintf(out, "\n"); | |
196 | if (count < 0) | |
197 | break; | |
198 | } | |
199 | } | |
200 | ||
201 | /* Look up symbol for debugging purpose. Returns "" if unknown. */ | |
202 | const char *lookup_symbol(void *orig_addr) | |
203 | { | |
204 | unsigned int i; | |
205 | /* Hack, because we know this is x86. */ | |
206 | Elf32_Sym *sym = disas_symtab; | |
207 | ||
208 | for (i = 0; i < disas_num_syms; i++) { | |
209 | if (sym[i].st_shndx == SHN_UNDEF | |
210 | || sym[i].st_shndx >= SHN_LORESERVE) | |
211 | continue; | |
212 | ||
213 | if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC) | |
214 | continue; | |
215 | ||
216 | if ((long)orig_addr >= sym[i].st_value | |
217 | && (long)orig_addr < sym[i].st_value + sym[i].st_size) | |
218 | return disas_strtab + sym[i].st_name; | |
219 | } | |
220 | return ""; | |
221 | } | |
222 | ||
223 | #if !defined(CONFIG_USER_ONLY) | |
224 | ||
225 | void term_vprintf(const char *fmt, va_list ap); | |
226 | void term_printf(const char *fmt, ...); | |
227 | ||
228 | static int monitor_disas_is_physical; | |
229 | ||
230 | static int | |
231 | monitor_read_memory (memaddr, myaddr, length, info) | |
232 | bfd_vma memaddr; | |
233 | bfd_byte *myaddr; | |
234 | int length; | |
235 | struct disassemble_info *info; | |
236 | { | |
237 | if (monitor_disas_is_physical) { | |
238 | cpu_physical_memory_rw(memaddr, myaddr, length, 0); | |
239 | } else { | |
240 | cpu_memory_rw_debug(cpu_single_env, memaddr,myaddr, length, 0); | |
241 | } | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static int monitor_fprintf(FILE *stream, const char *fmt, ...) | |
246 | { | |
247 | va_list ap; | |
248 | va_start(ap, fmt); | |
249 | term_vprintf(fmt, ap); | |
250 | va_end(ap); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | void monitor_disas(target_ulong pc, int nb_insn, int is_physical, int flags) | |
255 | { | |
256 | int count, i; | |
257 | struct disassemble_info disasm_info; | |
258 | int (*print_insn)(bfd_vma pc, disassemble_info *info); | |
259 | ||
260 | INIT_DISASSEMBLE_INFO(disasm_info, NULL, monitor_fprintf); | |
261 | ||
262 | monitor_disas_is_physical = is_physical; | |
263 | disasm_info.read_memory_func = monitor_read_memory; | |
264 | ||
265 | disasm_info.buffer_vma = pc; | |
266 | ||
267 | #ifdef TARGET_WORDS_BIGENDIAN | |
268 | disasm_info.endian = BFD_ENDIAN_BIG; | |
269 | #else | |
270 | disasm_info.endian = BFD_ENDIAN_LITTLE; | |
271 | #endif | |
272 | #if defined(TARGET_I386) | |
273 | if (!flags) | |
274 | disasm_info.mach = bfd_mach_i386_i386; | |
275 | else | |
276 | disasm_info.mach = bfd_mach_i386_i8086; | |
277 | print_insn = print_insn_i386; | |
278 | #elif defined(TARGET_ARM) | |
279 | print_insn = print_insn_arm; | |
280 | #elif defined(TARGET_SPARC) | |
281 | print_insn = print_insn_sparc; | |
282 | #elif defined(TARGET_PPC) | |
283 | print_insn = print_insn_ppc; | |
284 | #else | |
285 | term_printf("Asm output not supported on this arch\n"); | |
286 | return; | |
287 | #endif | |
288 | ||
289 | for(i = 0; i < nb_insn; i++) { | |
290 | term_printf("0x%08lx: ", (unsigned long)pc); | |
291 | count = print_insn(pc, &disasm_info); | |
292 | term_printf("\n"); | |
293 | if (count < 0) | |
294 | break; | |
295 | pc += count; | |
296 | } | |
297 | } | |
298 | #endif |