1 /* Disassemble support for GDB.
3 Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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. */
26 #include "gdb_string.h"
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. */
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. */
46 /* This variable determines where memory used for disassembly is read from. */
47 int gdb_disassemble_from_exec = -1;
49 /* This is the memory_read_func for gdb_disassemble when we are
50 disassembling from the exec file. */
52 gdb_dis_asm_read_memory (bfd_vma memaddr, bfd_byte * myaddr,
53 unsigned int len, disassemble_info * info)
55 extern struct target_ops exec_ops;
59 res = xfer_memory (memaddr, myaddr, len, 0, 0, &exec_ops);
70 compare_lines (const void *mle1p, const void *mle2p)
72 struct dis_line_entry *mle1, *mle2;
75 mle1 = (struct dis_line_entry *) mle1p;
76 mle2 = (struct dis_line_entry *) mle2p;
78 val = mle1->line - mle2->line;
83 return mle1->start_pc - mle2->start_pc;
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)
91 int num_displayed = 0;
94 /* parts of the symbolic representation of the address */
96 char *filename = NULL;
101 for (pc = low; pc < high;)
106 if (num_displayed >= how_many)
111 ui_out_tuple_begin (uiout, NULL);
112 ui_out_field_core_addr (uiout, "address", pc);
114 if (!build_address_symbolic (pc, 0, &name, &offset, &filename,
117 /* We don't care now about line, filename and
118 unmapped. But we might in the future. */
119 ui_out_text (uiout, " <");
120 ui_out_field_string (uiout, "func-name", name);
121 ui_out_text (uiout, "+");
122 ui_out_field_int (uiout, "offset", offset);
123 ui_out_text (uiout, ">:\t");
125 if (filename != NULL)
130 ui_file_rewind (stb->stream);
131 pc += TARGET_PRINT_INSN (pc, di);
132 ui_out_field_stream (uiout, "inst", stb);
133 ui_file_rewind (stb->stream);
134 ui_out_tuple_end (uiout);
135 ui_out_text (uiout, "\n");
137 return num_displayed;
140 /* The idea here is to present a source-O-centric view of a
141 function to the user. This means that things are presented
142 in source order, with (possibly) out of order assembly
143 immediately following. */
145 do_mixed_source_and_assembly (struct ui_out *uiout,
146 struct disassemble_info *di, int nlines,
147 struct linetable_entry *le,
148 CORE_ADDR low, CORE_ADDR high,
149 struct symtab *symtab,
150 int how_many, struct ui_stream *stb)
153 struct dis_line_entry *mle;
154 struct symtab_and_line sal;
156 int out_of_order = 0;
159 int num_displayed = 0;
161 mle = (struct dis_line_entry *) alloca (nlines
162 * sizeof (struct dis_line_entry));
164 /* Copy linetable entries for this function into our data
165 structure, creating end_pc's and setting out_of_order as
168 /* First, skip all the preceding functions. */
170 for (i = 0; i < nlines - 1 && le[i].pc < low; i++);
172 /* Now, copy all entries before the end of this function. */
174 for (; i < nlines - 1 && le[i].pc < high; i++)
176 if (le[i].line == le[i + 1].line && le[i].pc == le[i + 1].pc)
177 continue; /* Ignore duplicates */
179 /* Skip any end-of-function markers. */
183 mle[newlines].line = le[i].line;
184 if (le[i].line > le[i + 1].line)
186 mle[newlines].start_pc = le[i].pc;
187 mle[newlines].end_pc = le[i + 1].pc;
191 /* If we're on the last line, and it's part of the function,
192 then we need to get the end pc in a special way. */
194 if (i == nlines - 1 && le[i].pc < high)
196 mle[newlines].line = le[i].line;
197 mle[newlines].start_pc = le[i].pc;
198 sal = find_pc_line (le[i].pc, 0);
199 mle[newlines].end_pc = sal.end;
203 /* Now, sort mle by line #s (and, then by addresses within
207 qsort (mle, newlines, sizeof (struct dis_line_entry), compare_lines);
209 /* Now, for each line entry, emit the specified lines (unless
210 they have been emitted before), followed by the assembly code
213 ui_out_list_begin (uiout, "asm_insns");
215 for (i = 0; i < newlines; i++)
218 /* Print out everything from next_line to the current line. */
219 if (mle[i].line >= next_line)
223 /* Just one line to print. */
224 if (next_line == mle[i].line)
226 ui_out_tuple_begin (uiout, "src_and_asm_line");
227 print_source_lines (symtab, next_line, mle[i].line + 1, 0);
231 /* Several source lines w/o asm instructions associated. */
232 for (; next_line < mle[i].line; next_line++)
234 ui_out_tuple_begin (uiout, "src_and_asm_line");
235 print_source_lines (symtab, next_line, next_line + 1,
237 ui_out_list_begin (uiout, "line_asm_insn");
238 ui_out_list_end (uiout);
239 ui_out_tuple_end (uiout);
241 /* Print the last line and leave list open for
242 asm instructions to be added. */
243 ui_out_tuple_begin (uiout, "src_and_asm_line");
244 print_source_lines (symtab, next_line, mle[i].line + 1, 0);
249 ui_out_tuple_begin (uiout, "src_and_asm_line");
250 print_source_lines (symtab, mle[i].line, mle[i].line + 1, 0);
253 next_line = mle[i].line + 1;
254 ui_out_list_begin (uiout, "line_asm_insn");
255 /* Don't close the list if the lines are not in order. */
256 if (i < (newlines - 1) && mle[i + 1].line <= mle[i].line)
260 num_displayed += dump_insns (uiout, di, mle[i].start_pc, mle[i].end_pc,
264 ui_out_list_end (uiout);
265 ui_out_tuple_end (uiout);
266 ui_out_text (uiout, "\n");
270 if (num_displayed >= how_many)
273 ui_out_list_end (uiout);
278 do_assembly_only (struct ui_out *uiout, disassemble_info * di,
279 CORE_ADDR low, CORE_ADDR high,
280 int how_many, struct ui_stream *stb)
282 int num_displayed = 0;
284 ui_out_list_begin (uiout, "asm_insns");
286 num_displayed = dump_insns (uiout, di, low, high, how_many, stb);
288 ui_out_list_end (uiout);
292 gdb_disassembly (struct ui_out *uiout,
295 int mixed_source_and_assembly,
296 int how_many, CORE_ADDR low, CORE_ADDR high)
298 static disassemble_info di;
299 static int di_initialized;
300 /* To collect the instruction outputted from opcodes. */
301 static struct ui_stream *stb = NULL;
302 struct symtab *symtab = NULL;
303 struct linetable_entry *le = NULL;
308 /* We don't add a cleanup for this, because the allocation of
309 the stream is done once only for each gdb run, and we need to
310 keep it around until the end. Hopefully there won't be any
311 errors in the init code below, that make this function bail
313 stb = ui_out_stream_new (uiout);
314 INIT_DISASSEMBLE_INFO_NO_ARCH (di, stb->stream,
315 (fprintf_ftype) fprintf_unfiltered);
316 di.flavour = bfd_target_unknown_flavour;
317 di.memory_error_func = dis_asm_memory_error;
318 di.print_address_func = dis_asm_print_address;
322 di.mach = TARGET_PRINT_INSN_INFO->mach;
323 if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
324 di.endian = BFD_ENDIAN_BIG;
326 di.endian = BFD_ENDIAN_LITTLE;
328 /* If gdb_disassemble_from_exec == -1, then we use the following heuristic to
329 determine whether or not to do disassembly from target memory or from the
332 If we're debugging a local process, read target memory, instead of the
333 exec file. This makes disassembly of functions in shared libs work
334 correctly. Also, read target memory if we are debugging native threads.
336 Else, we're debugging a remote process, and should disassemble from the
337 exec file for speed. However, this is no good if the target modifies its
338 code (for relocation, or whatever). */
340 if (gdb_disassemble_from_exec == -1)
342 if (strcmp (target_shortname, "child") == 0
343 || strcmp (target_shortname, "procfs") == 0
344 || strcmp (target_shortname, "vxprocess") == 0
345 || strstr (target_shortname, "-threads") != NULL)
346 gdb_disassemble_from_exec = 0; /* It's a child process, read inferior mem */
348 gdb_disassemble_from_exec = 1; /* It's remote, read the exec file */
351 if (gdb_disassemble_from_exec)
352 di.read_memory_func = gdb_dis_asm_read_memory;
354 di.read_memory_func = dis_asm_read_memory;
356 /* Assume symtab is valid for whole PC range */
357 symtab = find_pc_symtab (low);
359 if (symtab != NULL && symtab->linetable != NULL)
361 /* Convert the linetable to a bunch of my_line_entry's. */
362 le = symtab->linetable->item;
363 nlines = symtab->linetable->nitems;
366 if (!mixed_source_and_assembly || nlines <= 0
367 || symtab == NULL || symtab->linetable == NULL)
368 do_assembly_only (uiout, &di, low, high, how_many, stb);
370 else if (mixed_source_and_assembly)
371 do_mixed_source_and_assembly (uiout, &di, nlines, le, low,
372 high, symtab, how_many, stb);
374 gdb_flush (gdb_stdout);