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