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[qemu/qemu_0_9_1_stable.git] / disas.c
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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>
7 #include "cpu.h"
8 #include "exec-all.h"
9 #include "disas.h"
11 /* Filled in by elfload.c. Simplistic, but will do for now. */
12 struct syminfo *syminfos = NULL;
14 /* Get LENGTH bytes from info's buffer, at target address memaddr.
15 Transfer them to myaddr. */
16 int
17 buffer_read_memory (memaddr, myaddr, length, info)
18 bfd_vma memaddr;
19 bfd_byte *myaddr;
20 int length;
21 struct disassemble_info *info;
23 if (memaddr < info->buffer_vma
24 || memaddr + length > info->buffer_vma + info->buffer_length)
25 /* Out of bounds. Use EIO because GDB uses it. */
26 return EIO;
27 memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
28 return 0;
31 /* Get LENGTH bytes from info's buffer, at target address memaddr.
32 Transfer them to myaddr. */
33 static int
34 target_read_memory (bfd_vma memaddr,
35 bfd_byte *myaddr,
36 int length,
37 struct disassemble_info *info)
39 int i;
40 for(i = 0; i < length; i++) {
41 myaddr[i] = ldub_code(memaddr + i);
43 return 0;
46 /* Print an error message. We can assume that this is in response to
47 an error return from buffer_read_memory. */
48 void
49 perror_memory (status, memaddr, info)
50 int status;
51 bfd_vma memaddr;
52 struct disassemble_info *info;
54 if (status != EIO)
55 /* Can't happen. */
56 (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
57 else
58 /* Actually, address between memaddr and memaddr + len was
59 out of bounds. */
60 (*info->fprintf_func) (info->stream,
61 "Address 0x%llx is out of bounds.\n", memaddr);
64 /* This could be in a separate file, to save miniscule amounts of space
65 in statically linked executables. */
67 /* Just print the address is hex. This is included for completeness even
68 though both GDB and objdump provide their own (to print symbolic
69 addresses). */
71 void
72 generic_print_address (addr, info)
73 bfd_vma addr;
74 struct disassemble_info *info;
76 (*info->fprintf_func) (info->stream, "0x%llx", addr);
79 /* Just return the given address. */
81 int
82 generic_symbol_at_address (addr, info)
83 bfd_vma addr;
84 struct disassemble_info * info;
86 return 1;
89 bfd_vma bfd_getl32 (const bfd_byte *addr)
91 unsigned long v;
93 v = (unsigned long) addr[0];
94 v |= (unsigned long) addr[1] << 8;
95 v |= (unsigned long) addr[2] << 16;
96 v |= (unsigned long) addr[3] << 24;
97 return (bfd_vma) v;
100 bfd_vma bfd_getb32 (const bfd_byte *addr)
102 unsigned long v;
104 v = (unsigned long) addr[0] << 24;
105 v |= (unsigned long) addr[1] << 16;
106 v |= (unsigned long) addr[2] << 8;
107 v |= (unsigned long) addr[3];
108 return (bfd_vma) v;
111 /* Disassemble this for me please... (debugging). 'flags' is only used
112 for i386: non zero means 16 bit code */
113 void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
115 target_ulong pc;
116 int count;
117 struct disassemble_info disasm_info;
118 int (*print_insn)(bfd_vma pc, disassemble_info *info);
120 INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
122 disasm_info.read_memory_func = target_read_memory;
123 disasm_info.buffer_vma = code;
124 disasm_info.buffer_length = size;
126 #ifdef TARGET_WORDS_BIGENDIAN
127 disasm_info.endian = BFD_ENDIAN_BIG;
128 #else
129 disasm_info.endian = BFD_ENDIAN_LITTLE;
130 #endif
131 #if defined(TARGET_I386)
132 if (flags == 2)
133 disasm_info.mach = bfd_mach_x86_64;
134 else if (flags == 1)
135 disasm_info.mach = bfd_mach_i386_i8086;
136 else
137 disasm_info.mach = bfd_mach_i386_i386;
138 print_insn = print_insn_i386;
139 #elif defined(TARGET_ARM)
140 print_insn = print_insn_arm;
141 #elif defined(TARGET_SPARC)
142 print_insn = print_insn_sparc;
143 #elif defined(TARGET_PPC)
144 if (cpu_single_env->msr[MSR_LE])
145 disasm_info.endian = BFD_ENDIAN_LITTLE;
146 print_insn = print_insn_ppc;
147 #else
148 fprintf(out, "0x" TARGET_FMT_lx
149 ": Asm output not supported on this arch\n", code);
150 return;
151 #endif
153 for (pc = code; pc < code + size; pc += count) {
154 fprintf(out, "0x" TARGET_FMT_lx ": ", pc);
155 count = print_insn(pc, &disasm_info);
156 #if 0
158 int i;
159 uint8_t b;
160 fprintf(out, " {");
161 for(i = 0; i < count; i++) {
162 target_read_memory(pc + i, &b, 1, &disasm_info);
163 fprintf(out, " %02x", b);
165 fprintf(out, " }");
167 #endif
168 fprintf(out, "\n");
169 if (count < 0)
170 break;
174 /* Disassemble this for me please... (debugging). */
175 void disas(FILE *out, void *code, unsigned long size)
177 unsigned long pc;
178 int count;
179 struct disassemble_info disasm_info;
180 int (*print_insn)(bfd_vma pc, disassemble_info *info);
182 INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
184 disasm_info.buffer = code;
185 disasm_info.buffer_vma = (unsigned long)code;
186 disasm_info.buffer_length = size;
188 #ifdef WORDS_BIGENDIAN
189 disasm_info.endian = BFD_ENDIAN_BIG;
190 #else
191 disasm_info.endian = BFD_ENDIAN_LITTLE;
192 #endif
193 #if defined(__i386__)
194 disasm_info.mach = bfd_mach_i386_i386;
195 print_insn = print_insn_i386;
196 #elif defined(__x86_64__)
197 disasm_info.mach = bfd_mach_x86_64;
198 print_insn = print_insn_i386;
199 #elif defined(__powerpc__)
200 print_insn = print_insn_ppc;
201 #elif defined(__alpha__)
202 print_insn = print_insn_alpha;
203 #elif defined(__sparc__)
204 print_insn = print_insn_sparc;
205 #elif defined(__arm__)
206 print_insn = print_insn_arm;
207 #else
208 fprintf(out, "0x%lx: Asm output not supported on this arch\n",
209 (long) code);
210 return;
211 #endif
212 for (pc = (unsigned long)code; pc < (unsigned long)code + size; pc += count) {
213 fprintf(out, "0x%08lx: ", pc);
214 #ifdef __arm__
215 /* since data are included in the code, it is better to
216 display code data too */
217 if (is_host) {
218 fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc));
220 #endif
221 count = print_insn(pc, &disasm_info);
222 fprintf(out, "\n");
223 if (count < 0)
224 break;
228 /* Look up symbol for debugging purpose. Returns "" if unknown. */
229 const char *lookup_symbol(target_ulong orig_addr)
231 unsigned int i;
232 /* Hack, because we know this is x86. */
233 Elf32_Sym *sym;
234 struct syminfo *s;
236 for (s = syminfos; s; s = s->next) {
237 sym = s->disas_symtab;
238 for (i = 0; i < s->disas_num_syms; i++) {
239 if (sym[i].st_shndx == SHN_UNDEF
240 || sym[i].st_shndx >= SHN_LORESERVE)
241 continue;
243 if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
244 continue;
246 if (orig_addr >= sym[i].st_value
247 && orig_addr < sym[i].st_value + sym[i].st_size)
248 return s->disas_strtab + sym[i].st_name;
251 return "";
254 #if !defined(CONFIG_USER_ONLY)
256 void term_vprintf(const char *fmt, va_list ap);
257 void term_printf(const char *fmt, ...);
259 static int monitor_disas_is_physical;
261 static int
262 monitor_read_memory (memaddr, myaddr, length, info)
263 bfd_vma memaddr;
264 bfd_byte *myaddr;
265 int length;
266 struct disassemble_info *info;
268 if (monitor_disas_is_physical) {
269 cpu_physical_memory_rw(memaddr, myaddr, length, 0);
270 } else {
271 cpu_memory_rw_debug(cpu_single_env, memaddr,myaddr, length, 0);
273 return 0;
276 static int monitor_fprintf(FILE *stream, const char *fmt, ...)
278 va_list ap;
279 va_start(ap, fmt);
280 term_vprintf(fmt, ap);
281 va_end(ap);
282 return 0;
285 void monitor_disas(target_ulong pc, int nb_insn, int is_physical, int flags)
287 int count, i;
288 struct disassemble_info disasm_info;
289 int (*print_insn)(bfd_vma pc, disassemble_info *info);
291 INIT_DISASSEMBLE_INFO(disasm_info, NULL, monitor_fprintf);
293 monitor_disas_is_physical = is_physical;
294 disasm_info.read_memory_func = monitor_read_memory;
296 disasm_info.buffer_vma = pc;
298 #ifdef TARGET_WORDS_BIGENDIAN
299 disasm_info.endian = BFD_ENDIAN_BIG;
300 #else
301 disasm_info.endian = BFD_ENDIAN_LITTLE;
302 #endif
303 #if defined(TARGET_I386)
304 if (flags == 2)
305 disasm_info.mach = bfd_mach_x86_64;
306 else if (flags == 1)
307 disasm_info.mach = bfd_mach_i386_i8086;
308 else
309 disasm_info.mach = bfd_mach_i386_i386;
310 print_insn = print_insn_i386;
311 #elif defined(TARGET_ARM)
312 print_insn = print_insn_arm;
313 #elif defined(TARGET_SPARC)
314 print_insn = print_insn_sparc;
315 #elif defined(TARGET_PPC)
316 print_insn = print_insn_ppc;
317 #else
318 term_printf("0x" TARGET_FMT_lx
319 ": Asm output not supported on this arch\n", pc);
320 return;
321 #endif
323 for(i = 0; i < nb_insn; i++) {
324 term_printf("0x" TARGET_FMT_lx ": ", pc);
325 count = print_insn(pc, &disasm_info);
326 term_printf("\n");
327 if (count < 0)
328 break;
329 pc += count;
332 #endif