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92df71f0 | 1 | /* Disassemble support for GDB. |
1bac305b AC |
2 | |
3 | Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc. | |
92df71f0 FN |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "target.h" | |
24 | #include "value.h" | |
25 | #include "ui-out.h" | |
26 | #include "gdb_string.h" | |
27 | ||
28 | #include "disasm.h" | |
29 | ||
30 | /* Disassemble functions. | |
31 | FIXME: We should get rid of all the duplicate code in gdb that does | |
32 | the same thing: disassemble_command() and the gdbtk variation. */ | |
33 | ||
34 | /* This Structure is used to store line number information. | |
35 | We need a different sort of line table from the normal one cuz we can't | |
36 | depend upon implicit line-end pc's for lines to do the | |
37 | reordering in this function. */ | |
38 | ||
39 | struct dis_line_entry | |
40 | { | |
41 | int line; | |
42 | CORE_ADDR start_pc; | |
43 | CORE_ADDR end_pc; | |
44 | }; | |
45 | ||
46 | /* This variable determines where memory used for disassembly is read from. */ | |
47 | int gdb_disassemble_from_exec = -1; | |
48 | ||
49 | /* This is the memory_read_func for gdb_disassemble when we are | |
50 | disassembling from the exec file. */ | |
51 | static int | |
52 | gdb_dis_asm_read_memory (bfd_vma memaddr, bfd_byte * myaddr, | |
53 | unsigned int len, disassemble_info * info) | |
54 | { | |
55 | extern struct target_ops exec_ops; | |
56 | int res; | |
57 | ||
58 | errno = 0; | |
59 | res = xfer_memory (memaddr, myaddr, len, 0, 0, &exec_ops); | |
60 | ||
61 | if (res == len) | |
62 | return 0; | |
63 | else if (errno == 0) | |
64 | return EIO; | |
65 | else | |
66 | return errno; | |
67 | } | |
68 | ||
69 | static int | |
bde58177 | 70 | compare_lines (const void *mle1p, const void *mle2p) |
92df71f0 FN |
71 | { |
72 | struct dis_line_entry *mle1, *mle2; | |
73 | int val; | |
74 | ||
75 | mle1 = (struct dis_line_entry *) mle1p; | |
76 | mle2 = (struct dis_line_entry *) mle2p; | |
77 | ||
78 | val = mle1->line - mle2->line; | |
79 | ||
80 | if (val != 0) | |
81 | return val; | |
82 | ||
83 | return mle1->start_pc - mle2->start_pc; | |
84 | } | |
85 | ||
86 | static int | |
87 | dump_insns (struct ui_out *uiout, disassemble_info * di, | |
88 | CORE_ADDR low, CORE_ADDR high, | |
89 | int how_many, struct ui_stream *stb) | |
90 | { | |
91 | int num_displayed = 0; | |
92 | CORE_ADDR pc; | |
93 | ||
94 | /* parts of the symbolic representation of the address */ | |
95 | int unmapped; | |
96 | char *filename = NULL; | |
97 | char *name = NULL; | |
98 | int offset; | |
99 | int line; | |
3b31d625 | 100 | struct cleanup *ui_out_chain; |
92df71f0 FN |
101 | |
102 | for (pc = low; pc < high;) | |
103 | { | |
104 | QUIT; | |
105 | if (how_many >= 0) | |
106 | { | |
107 | if (num_displayed >= how_many) | |
108 | break; | |
109 | else | |
110 | num_displayed++; | |
111 | } | |
3b31d625 | 112 | ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); |
92df71f0 FN |
113 | ui_out_field_core_addr (uiout, "address", pc); |
114 | ||
115 | if (!build_address_symbolic (pc, 0, &name, &offset, &filename, | |
116 | &line, &unmapped)) | |
117 | { | |
118 | /* We don't care now about line, filename and | |
119 | unmapped. But we might in the future. */ | |
120 | ui_out_text (uiout, " <"); | |
121 | ui_out_field_string (uiout, "func-name", name); | |
122 | ui_out_text (uiout, "+"); | |
123 | ui_out_field_int (uiout, "offset", offset); | |
124 | ui_out_text (uiout, ">:\t"); | |
125 | } | |
126 | if (filename != NULL) | |
127 | xfree (filename); | |
128 | if (name != NULL) | |
129 | xfree (name); | |
130 | ||
131 | ui_file_rewind (stb->stream); | |
132 | pc += TARGET_PRINT_INSN (pc, di); | |
133 | ui_out_field_stream (uiout, "inst", stb); | |
134 | ui_file_rewind (stb->stream); | |
3b31d625 | 135 | do_cleanups (ui_out_chain); |
92df71f0 FN |
136 | ui_out_text (uiout, "\n"); |
137 | } | |
138 | return num_displayed; | |
139 | } | |
140 | ||
141 | /* The idea here is to present a source-O-centric view of a | |
142 | function to the user. This means that things are presented | |
143 | in source order, with (possibly) out of order assembly | |
144 | immediately following. */ | |
145 | static void | |
146 | do_mixed_source_and_assembly (struct ui_out *uiout, | |
147 | struct disassemble_info *di, int nlines, | |
148 | struct linetable_entry *le, | |
149 | CORE_ADDR low, CORE_ADDR high, | |
150 | struct symtab *symtab, | |
151 | int how_many, struct ui_stream *stb) | |
152 | { | |
153 | int newlines = 0; | |
154 | struct dis_line_entry *mle; | |
155 | struct symtab_and_line sal; | |
156 | int i; | |
157 | int out_of_order = 0; | |
158 | int next_line = 0; | |
159 | CORE_ADDR pc; | |
160 | int num_displayed = 0; | |
3b31d625 | 161 | struct cleanup *ui_out_chain; |
92df71f0 FN |
162 | |
163 | mle = (struct dis_line_entry *) alloca (nlines | |
164 | * sizeof (struct dis_line_entry)); | |
165 | ||
166 | /* Copy linetable entries for this function into our data | |
167 | structure, creating end_pc's and setting out_of_order as | |
168 | appropriate. */ | |
169 | ||
170 | /* First, skip all the preceding functions. */ | |
171 | ||
172 | for (i = 0; i < nlines - 1 && le[i].pc < low; i++); | |
173 | ||
174 | /* Now, copy all entries before the end of this function. */ | |
175 | ||
176 | for (; i < nlines - 1 && le[i].pc < high; i++) | |
177 | { | |
178 | if (le[i].line == le[i + 1].line && le[i].pc == le[i + 1].pc) | |
179 | continue; /* Ignore duplicates */ | |
180 | ||
181 | /* Skip any end-of-function markers. */ | |
182 | if (le[i].line == 0) | |
183 | continue; | |
184 | ||
185 | mle[newlines].line = le[i].line; | |
186 | if (le[i].line > le[i + 1].line) | |
187 | out_of_order = 1; | |
188 | mle[newlines].start_pc = le[i].pc; | |
189 | mle[newlines].end_pc = le[i + 1].pc; | |
190 | newlines++; | |
191 | } | |
192 | ||
193 | /* If we're on the last line, and it's part of the function, | |
194 | then we need to get the end pc in a special way. */ | |
195 | ||
196 | if (i == nlines - 1 && le[i].pc < high) | |
197 | { | |
198 | mle[newlines].line = le[i].line; | |
199 | mle[newlines].start_pc = le[i].pc; | |
200 | sal = find_pc_line (le[i].pc, 0); | |
201 | mle[newlines].end_pc = sal.end; | |
202 | newlines++; | |
203 | } | |
204 | ||
205 | /* Now, sort mle by line #s (and, then by addresses within | |
206 | lines). */ | |
207 | ||
208 | if (out_of_order) | |
209 | qsort (mle, newlines, sizeof (struct dis_line_entry), compare_lines); | |
210 | ||
211 | /* Now, for each line entry, emit the specified lines (unless | |
212 | they have been emitted before), followed by the assembly code | |
213 | for that line. */ | |
214 | ||
3b31d625 | 215 | ui_out_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns"); |
92df71f0 FN |
216 | |
217 | for (i = 0; i < newlines; i++) | |
218 | { | |
3b31d625 EZ |
219 | struct cleanup *ui_out_tuple_chain = NULL; |
220 | struct cleanup *ui_out_list_chain = NULL; | |
92df71f0 | 221 | int close_list = 1; |
3b31d625 | 222 | |
92df71f0 FN |
223 | /* Print out everything from next_line to the current line. */ |
224 | if (mle[i].line >= next_line) | |
225 | { | |
226 | if (next_line != 0) | |
227 | { | |
228 | /* Just one line to print. */ | |
229 | if (next_line == mle[i].line) | |
230 | { | |
3b31d625 EZ |
231 | ui_out_tuple_chain |
232 | = make_cleanup_ui_out_tuple_begin_end (uiout, | |
233 | "src_and_asm_line"); | |
92df71f0 FN |
234 | print_source_lines (symtab, next_line, mle[i].line + 1, 0); |
235 | } | |
236 | else | |
237 | { | |
238 | /* Several source lines w/o asm instructions associated. */ | |
239 | for (; next_line < mle[i].line; next_line++) | |
240 | { | |
3b31d625 EZ |
241 | struct cleanup *ui_out_list_chain_line; |
242 | struct cleanup *ui_out_tuple_chain_line; | |
243 | ||
244 | ui_out_tuple_chain_line | |
245 | = make_cleanup_ui_out_tuple_begin_end (uiout, | |
246 | "src_and_asm_line"); | |
92df71f0 FN |
247 | print_source_lines (symtab, next_line, next_line + 1, |
248 | 0); | |
3b31d625 EZ |
249 | ui_out_list_chain_line |
250 | = make_cleanup_ui_out_list_begin_end (uiout, | |
251 | "line_asm_insn"); | |
252 | do_cleanups (ui_out_list_chain_line); | |
253 | do_cleanups (ui_out_tuple_chain_line); | |
92df71f0 FN |
254 | } |
255 | /* Print the last line and leave list open for | |
256 | asm instructions to be added. */ | |
3b31d625 EZ |
257 | ui_out_tuple_chain |
258 | = make_cleanup_ui_out_tuple_begin_end (uiout, | |
259 | "src_and_asm_line"); | |
92df71f0 FN |
260 | print_source_lines (symtab, next_line, mle[i].line + 1, 0); |
261 | } | |
262 | } | |
263 | else | |
264 | { | |
3b31d625 EZ |
265 | ui_out_tuple_chain |
266 | = make_cleanup_ui_out_tuple_begin_end (uiout, "src_and_asm_line"); | |
92df71f0 FN |
267 | print_source_lines (symtab, mle[i].line, mle[i].line + 1, 0); |
268 | } | |
269 | ||
270 | next_line = mle[i].line + 1; | |
3b31d625 EZ |
271 | ui_out_list_chain |
272 | = make_cleanup_ui_out_list_begin_end (uiout, "line_asm_insn"); | |
92df71f0 FN |
273 | /* Don't close the list if the lines are not in order. */ |
274 | if (i < (newlines - 1) && mle[i + 1].line <= mle[i].line) | |
275 | close_list = 0; | |
276 | } | |
277 | ||
278 | num_displayed += dump_insns (uiout, di, mle[i].start_pc, mle[i].end_pc, | |
279 | how_many, stb); | |
280 | if (close_list) | |
281 | { | |
3b31d625 EZ |
282 | do_cleanups (ui_out_list_chain); |
283 | do_cleanups (ui_out_tuple_chain); | |
92df71f0 FN |
284 | ui_out_text (uiout, "\n"); |
285 | close_list = 0; | |
286 | } | |
287 | if (how_many >= 0) | |
288 | if (num_displayed >= how_many) | |
289 | break; | |
290 | } | |
3b31d625 | 291 | do_cleanups (ui_out_chain); |
92df71f0 FN |
292 | } |
293 | ||
294 | ||
295 | static void | |
296 | do_assembly_only (struct ui_out *uiout, disassemble_info * di, | |
297 | CORE_ADDR low, CORE_ADDR high, | |
298 | int how_many, struct ui_stream *stb) | |
299 | { | |
300 | int num_displayed = 0; | |
3b31d625 | 301 | struct cleanup *ui_out_chain; |
92df71f0 | 302 | |
3b31d625 | 303 | ui_out_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns"); |
92df71f0 FN |
304 | |
305 | num_displayed = dump_insns (uiout, di, low, high, how_many, stb); | |
306 | ||
3b31d625 | 307 | do_cleanups (ui_out_chain); |
92df71f0 FN |
308 | } |
309 | ||
310 | void | |
311 | gdb_disassembly (struct ui_out *uiout, | |
312 | char *file_string, | |
313 | int line_num, | |
314 | int mixed_source_and_assembly, | |
315 | int how_many, CORE_ADDR low, CORE_ADDR high) | |
316 | { | |
317 | static disassemble_info di; | |
318 | static int di_initialized; | |
319 | /* To collect the instruction outputted from opcodes. */ | |
320 | static struct ui_stream *stb = NULL; | |
321 | struct symtab *symtab = NULL; | |
322 | struct linetable_entry *le = NULL; | |
323 | int nlines = -1; | |
324 | ||
325 | if (!di_initialized) | |
326 | { | |
327 | /* We don't add a cleanup for this, because the allocation of | |
328 | the stream is done once only for each gdb run, and we need to | |
329 | keep it around until the end. Hopefully there won't be any | |
330 | errors in the init code below, that make this function bail | |
331 | out. */ | |
332 | stb = ui_out_stream_new (uiout); | |
333 | INIT_DISASSEMBLE_INFO_NO_ARCH (di, stb->stream, | |
334 | (fprintf_ftype) fprintf_unfiltered); | |
335 | di.flavour = bfd_target_unknown_flavour; | |
336 | di.memory_error_func = dis_asm_memory_error; | |
337 | di.print_address_func = dis_asm_print_address; | |
338 | di_initialized = 1; | |
339 | } | |
340 | ||
341 | di.mach = TARGET_PRINT_INSN_INFO->mach; | |
342 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) | |
343 | di.endian = BFD_ENDIAN_BIG; | |
344 | else | |
345 | di.endian = BFD_ENDIAN_LITTLE; | |
346 | ||
347 | /* If gdb_disassemble_from_exec == -1, then we use the following heuristic to | |
348 | determine whether or not to do disassembly from target memory or from the | |
349 | exec file: | |
350 | ||
351 | If we're debugging a local process, read target memory, instead of the | |
352 | exec file. This makes disassembly of functions in shared libs work | |
353 | correctly. Also, read target memory if we are debugging native threads. | |
354 | ||
355 | Else, we're debugging a remote process, and should disassemble from the | |
356 | exec file for speed. However, this is no good if the target modifies its | |
357 | code (for relocation, or whatever). */ | |
358 | ||
359 | if (gdb_disassemble_from_exec == -1) | |
360 | { | |
361 | if (strcmp (target_shortname, "child") == 0 | |
362 | || strcmp (target_shortname, "procfs") == 0 | |
363 | || strcmp (target_shortname, "vxprocess") == 0 | |
364 | || strstr (target_shortname, "-threads") != NULL) | |
365 | gdb_disassemble_from_exec = 0; /* It's a child process, read inferior mem */ | |
366 | else | |
367 | gdb_disassemble_from_exec = 1; /* It's remote, read the exec file */ | |
368 | } | |
369 | ||
370 | if (gdb_disassemble_from_exec) | |
371 | di.read_memory_func = gdb_dis_asm_read_memory; | |
372 | else | |
373 | di.read_memory_func = dis_asm_read_memory; | |
374 | ||
375 | /* Assume symtab is valid for whole PC range */ | |
376 | symtab = find_pc_symtab (low); | |
377 | ||
378 | if (symtab != NULL && symtab->linetable != NULL) | |
379 | { | |
380 | /* Convert the linetable to a bunch of my_line_entry's. */ | |
381 | le = symtab->linetable->item; | |
382 | nlines = symtab->linetable->nitems; | |
383 | } | |
384 | ||
385 | if (!mixed_source_and_assembly || nlines <= 0 | |
386 | || symtab == NULL || symtab->linetable == NULL) | |
387 | do_assembly_only (uiout, &di, low, high, how_many, stb); | |
388 | ||
389 | else if (mixed_source_and_assembly) | |
390 | do_mixed_source_and_assembly (uiout, &di, nlines, le, low, | |
391 | high, symtab, how_many, stb); | |
392 | ||
393 | gdb_flush (gdb_stdout); | |
394 | } |