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 struct syminfo *syminfos = NULL;
13
14 /* Get LENGTH bytes from info's buffer, at target address memaddr.
15 Transfer them to myaddr. */
16 int
buffer_read_memory(bfd_vma memaddr,bfd_byte * myaddr,int length,struct disassemble_info * info)17 buffer_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
18 struct disassemble_info *info)
19 {
20 if (memaddr < info->buffer_vma
21 || memaddr + length > info->buffer_vma + info->buffer_length)
22 /* Out of bounds. Use EIO because GDB uses it. */
23 return EIO;
24 memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
25 return 0;
26 }
27
28 /* Get LENGTH bytes from info's buffer, at target address memaddr.
29 Transfer them to myaddr. */
30 static int
target_read_memory(bfd_vma memaddr,bfd_byte * myaddr,int length,struct disassemble_info * info)31 target_read_memory (bfd_vma memaddr,
32 bfd_byte *myaddr,
33 int length,
34 struct disassemble_info *info)
35 {
36 cpu_memory_rw_debug(cpu_single_env, memaddr, myaddr, length, 0);
37 return 0;
38 }
39
40 /* Print an error message. We can assume that this is in response to
41 an error return from buffer_read_memory. */
42 void
perror_memory(int status,bfd_vma memaddr,struct disassemble_info * info)43 perror_memory (int status, bfd_vma memaddr, struct disassemble_info *info)
44 {
45 if (status != EIO)
46 /* Can't happen. */
47 (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
48 else
49 /* Actually, address between memaddr and memaddr + len was
50 out of bounds. */
51 (*info->fprintf_func) (info->stream,
52 "Address 0x%" PRIx64 " is out of bounds.\n", memaddr);
53 }
54
55 /* This could be in a separate file, to save miniscule amounts of space
56 in statically linked executables. */
57
58 /* Just print the address is hex. This is included for completeness even
59 though both GDB and objdump provide their own (to print symbolic
60 addresses). */
61
62 void
generic_print_address(bfd_vma addr,struct disassemble_info * info)63 generic_print_address (bfd_vma addr, struct disassemble_info *info)
64 {
65 (*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);
66 }
67
68 /* Just return the given address. */
69
70 int
generic_symbol_at_address(bfd_vma addr,struct disassemble_info * info)71 generic_symbol_at_address (bfd_vma addr, struct disassemble_info *info)
72 {
73 return 1;
74 }
75
bfd_getl32(const bfd_byte * addr)76 bfd_vma bfd_getl32 (const bfd_byte *addr)
77 {
78 unsigned long v;
79
80 v = (unsigned long) addr[0];
81 v |= (unsigned long) addr[1] << 8;
82 v |= (unsigned long) addr[2] << 16;
83 v |= (unsigned long) addr[3] << 24;
84 return (bfd_vma) v;
85 }
86
bfd_getb32(const bfd_byte * addr)87 bfd_vma bfd_getb32 (const bfd_byte *addr)
88 {
89 unsigned long v;
90
91 v = (unsigned long) addr[0] << 24;
92 v |= (unsigned long) addr[1] << 16;
93 v |= (unsigned long) addr[2] << 8;
94 v |= (unsigned long) addr[3];
95 return (bfd_vma) v;
96 }
97
bfd_getl16(const bfd_byte * addr)98 bfd_vma bfd_getl16 (const bfd_byte *addr)
99 {
100 unsigned long v;
101
102 v = (unsigned long) addr[0];
103 v |= (unsigned long) addr[1] << 8;
104 return (bfd_vma) v;
105 }
106
bfd_getb16(const bfd_byte * addr)107 bfd_vma bfd_getb16 (const bfd_byte *addr)
108 {
109 unsigned long v;
110
111 v = (unsigned long) addr[0] << 24;
112 v |= (unsigned long) addr[1] << 16;
113 return (bfd_vma) v;
114 }
115
116 #ifdef TARGET_ARM
117 static int
print_insn_thumb1(bfd_vma pc,disassemble_info * info)118 print_insn_thumb1(bfd_vma pc, disassemble_info *info)
119 {
120 return print_insn_arm(pc | 1, info);
121 }
122 #endif
123
124 /* Disassemble this for me please... (debugging). 'flags' has the following
125 values:
126 i386 - nonzero means 16 bit code
127 arm - nonzero means thumb code
128 ppc - nonzero means little endian
129 other targets - unused
130 */
target_disas(FILE * out,target_ulong code,target_ulong size,int flags)131 void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
132 {
133 target_ulong pc;
134 int count;
135 struct disassemble_info disasm_info;
136 int (*print_insn)(bfd_vma pc, disassemble_info *info);
137
138 INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
139
140 disasm_info.read_memory_func = target_read_memory;
141 disasm_info.buffer_vma = code;
142 disasm_info.buffer_length = size;
143
144 #ifdef TARGET_WORDS_BIGENDIAN
145 disasm_info.endian = BFD_ENDIAN_BIG;
146 #else
147 disasm_info.endian = BFD_ENDIAN_LITTLE;
148 #endif
149 #if defined(TARGET_I386)
150 if (flags == 2)
151 disasm_info.mach = bfd_mach_x86_64;
152 else if (flags == 1)
153 disasm_info.mach = bfd_mach_i386_i8086;
154 else
155 disasm_info.mach = bfd_mach_i386_i386;
156 print_insn = print_insn_i386;
157 #elif defined(TARGET_ARM)
158 if (flags)
159 print_insn = print_insn_thumb1;
160 else
161 print_insn = print_insn_arm;
162 #elif defined(TARGET_SPARC)
163 print_insn = print_insn_sparc;
164 #ifdef TARGET_SPARC64
165 disasm_info.mach = bfd_mach_sparc_v9b;
166 #endif
167 #elif defined(TARGET_PPC)
168 if (flags >> 16)
169 disasm_info.endian = BFD_ENDIAN_LITTLE;
170 if (flags & 0xFFFF) {
171 /* If we have a precise definitions of the instructions set, use it */
172 disasm_info.mach = flags & 0xFFFF;
173 } else {
174 #ifdef TARGET_PPC64
175 disasm_info.mach = bfd_mach_ppc64;
176 #else
177 disasm_info.mach = bfd_mach_ppc;
178 #endif
179 }
180 print_insn = print_insn_ppc;
181 #elif defined(TARGET_M68K)
182 print_insn = print_insn_m68k;
183 #elif defined(TARGET_MIPS)
184 #ifdef TARGET_WORDS_BIGENDIAN
185 print_insn = print_insn_big_mips;
186 #else
187 print_insn = print_insn_little_mips;
188 #endif
189 #elif defined(TARGET_SH4)
190 disasm_info.mach = bfd_mach_sh4;
191 print_insn = print_insn_sh;
192 #elif defined(TARGET_ALPHA)
193 disasm_info.mach = bfd_mach_alpha;
194 print_insn = print_insn_alpha;
195 #elif defined(TARGET_CRIS)
196 disasm_info.mach = bfd_mach_cris_v32;
197 print_insn = print_insn_crisv32;
198 #elif defined(TARGET_MICROBLAZE)
199 disasm_info.mach = bfd_arch_microblaze;
200 print_insn = print_insn_microblaze;
201 #else
202 fprintf(out, "0x" TARGET_FMT_lx
203 ": Asm output not supported on this arch\n", code);
204 return;
205 #endif
206
207 for (pc = code; size > 0; pc += count, size -= count) {
208 fprintf(out, "0x" TARGET_FMT_lx ": ", pc);
209 count = print_insn(pc, &disasm_info);
210 #if 0
211 {
212 int i;
213 uint8_t b;
214 fprintf(out, " {");
215 for(i = 0; i < count; i++) {
216 target_read_memory(pc + i, &b, 1, &disasm_info);
217 fprintf(out, " %02x", b);
218 }
219 fprintf(out, " }");
220 }
221 #endif
222 fprintf(out, "\n");
223 if (count < 0)
224 break;
225 if (size < count) {
226 fprintf(out,
227 "Disassembler disagrees with translator over instruction "
228 "decoding\n"
229 "Please report this to qemu-devel@nongnu.org\n");
230 break;
231 }
232 }
233 }
234
235 /* Disassemble this for me please... (debugging). */
disas(FILE * out,void * code,unsigned long size)236 void disas(FILE *out, void *code, unsigned long size)
237 {
238 unsigned long pc;
239 int count;
240 struct disassemble_info disasm_info;
241 int (*print_insn)(bfd_vma pc, disassemble_info *info);
242
243 INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
244
245 disasm_info.buffer = code;
246 disasm_info.buffer_vma = (unsigned long)code;
247 disasm_info.buffer_length = size;
248
249 #ifdef WORDS_BIGENDIAN
250 disasm_info.endian = BFD_ENDIAN_BIG;
251 #else
252 disasm_info.endian = BFD_ENDIAN_LITTLE;
253 #endif
254 #if defined(__i386__)
255 disasm_info.mach = bfd_mach_i386_i386;
256 print_insn = print_insn_i386;
257 #elif defined(__x86_64__)
258 disasm_info.mach = bfd_mach_x86_64;
259 print_insn = print_insn_i386;
260 #elif defined(_ARCH_PPC)
261 print_insn = print_insn_ppc;
262 #elif defined(__alpha__)
263 print_insn = print_insn_alpha;
264 #elif defined(__sparc__)
265 print_insn = print_insn_sparc;
266 #if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
267 disasm_info.mach = bfd_mach_sparc_v9b;
268 #endif
269 #elif defined(__arm__)
270 print_insn = print_insn_arm;
271 #elif defined(__MIPSEB__)
272 print_insn = print_insn_big_mips;
273 #elif defined(__MIPSEL__)
274 print_insn = print_insn_little_mips;
275 #elif defined(__m68k__)
276 print_insn = print_insn_m68k;
277 #elif defined(__s390__)
278 print_insn = print_insn_s390;
279 #elif defined(__hppa__)
280 print_insn = print_insn_hppa;
281 #else
282 fprintf(out, "0x%lx: Asm output not supported on this arch\n",
283 (long) code);
284 return;
285 #endif
286 for (pc = (unsigned long)code; size > 0; pc += count, size -= count) {
287 fprintf(out, "0x%08lx: ", pc);
288 #ifdef __arm__
289 /* since data is included in the code, it is better to
290 display code data too */
291 fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc));
292 #endif
293 count = print_insn(pc, &disasm_info);
294 fprintf(out, "\n");
295 if (count < 0)
296 break;
297 }
298 }
299
300 /* Look up symbol for debugging purpose. Returns "" if unknown. */
lookup_symbol(target_ulong orig_addr)301 const char *lookup_symbol(target_ulong orig_addr)
302 {
303 const char *symbol = "";
304 struct syminfo *s;
305
306 for (s = syminfos; s; s = s->next) {
307 symbol = s->lookup_symbol(s, orig_addr);
308 if (symbol[0] != '\0') {
309 break;
310 }
311 }
312
313 return symbol;
314 }
315
316 #if !defined(CONFIG_USER_ONLY)
317
318 #include "monitor.h"
319
320 static int monitor_disas_is_physical;
321 static CPUState *monitor_disas_env;
322
323 static int
monitor_read_memory(bfd_vma memaddr,bfd_byte * myaddr,int length,struct disassemble_info * info)324 monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,
325 struct disassemble_info *info)
326 {
327 if (monitor_disas_is_physical) {
328 cpu_physical_memory_rw(memaddr, myaddr, length, 0);
329 } else {
330 cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);
331 }
332 return 0;
333 }
334
monitor_fprintf(FILE * stream,const char * fmt,...)335 static int monitor_fprintf(FILE *stream, const char *fmt, ...)
336 {
337 va_list ap;
338 va_start(ap, fmt);
339 monitor_vprintf((Monitor *)stream, fmt, ap);
340 va_end(ap);
341 return 0;
342 }
343
monitor_disas(Monitor * mon,CPUState * env,target_ulong pc,int nb_insn,int is_physical,int flags)344 void monitor_disas(Monitor *mon, CPUState *env,
345 target_ulong pc, int nb_insn, int is_physical, int flags)
346 {
347 int count, i;
348 struct disassemble_info disasm_info;
349 int (*print_insn)(bfd_vma pc, disassemble_info *info);
350
351 INIT_DISASSEMBLE_INFO(disasm_info, (FILE *)mon, monitor_fprintf);
352
353 monitor_disas_env = env;
354 monitor_disas_is_physical = is_physical;
355 disasm_info.read_memory_func = monitor_read_memory;
356
357 disasm_info.buffer_vma = pc;
358
359 #ifdef TARGET_WORDS_BIGENDIAN
360 disasm_info.endian = BFD_ENDIAN_BIG;
361 #else
362 disasm_info.endian = BFD_ENDIAN_LITTLE;
363 #endif
364 #if defined(TARGET_I386)
365 if (flags == 2)
366 disasm_info.mach = bfd_mach_x86_64;
367 else if (flags == 1)
368 disasm_info.mach = bfd_mach_i386_i8086;
369 else
370 disasm_info.mach = bfd_mach_i386_i386;
371 print_insn = print_insn_i386;
372 #elif defined(TARGET_ARM)
373 print_insn = print_insn_arm;
374 #elif defined(TARGET_ALPHA)
375 print_insn = print_insn_alpha;
376 #elif defined(TARGET_SPARC)
377 print_insn = print_insn_sparc;
378 #ifdef TARGET_SPARC64
379 disasm_info.mach = bfd_mach_sparc_v9b;
380 #endif
381 #elif defined(TARGET_PPC)
382 #ifdef TARGET_PPC64
383 disasm_info.mach = bfd_mach_ppc64;
384 #else
385 disasm_info.mach = bfd_mach_ppc;
386 #endif
387 print_insn = print_insn_ppc;
388 #elif defined(TARGET_M68K)
389 print_insn = print_insn_m68k;
390 #elif defined(TARGET_MIPS)
391 #ifdef TARGET_WORDS_BIGENDIAN
392 print_insn = print_insn_big_mips;
393 #else
394 print_insn = print_insn_little_mips;
395 #endif
396 #else
397 monitor_printf(mon, "0x" TARGET_FMT_lx
398 ": Asm output not supported on this arch\n", pc);
399 return;
400 #endif
401
402 for(i = 0; i < nb_insn; i++) {
403 monitor_printf(mon, "0x" TARGET_FMT_lx ": ", pc);
404 count = print_insn(pc, &disasm_info);
405 monitor_printf(mon, "\n");
406 if (count < 0)
407 break;
408 pc += count;
409 }
410 }
411 #endif
412