Upgrade GDB from 7.4.1 to 7.6.1 on the vendor branch
[dragonfly.git] / contrib / gdb-7 / gdb / tui / tui-disasm.c
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1/* Disassembly display.
2
ef5ccd6c 3 Copyright (C) 1998-2013 Free Software Foundation, Inc.
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4
5 Contributed by Hewlett-Packard Company.
6
7 This file is part of GDB.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21
22#include "defs.h"
cf7f2e2d 23#include "arch-utils.h"
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24#include "symtab.h"
25#include "breakpoint.h"
26#include "frame.h"
27#include "value.h"
28#include "source.h"
29#include "disasm.h"
30#include "gdb_string.h"
31#include "tui/tui.h"
32#include "tui/tui-data.h"
33#include "tui/tui-win.h"
34#include "tui/tui-layout.h"
35#include "tui/tui-winsource.h"
36#include "tui/tui-stack.h"
37#include "tui/tui-file.h"
38#include "tui/tui-disasm.h"
cf7f2e2d 39#include "progspace.h"
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40
41#include "gdb_curses.h"
42
43struct tui_asm_line
44{
45 CORE_ADDR addr;
46 char *addr_string;
47 char *insn;
48};
49
50/* Function to set the disassembly window's content.
51 Disassemble count lines starting at pc.
52 Return address of the count'th instruction after pc. */
53static CORE_ADDR
54tui_disassemble (struct gdbarch *gdbarch, struct tui_asm_line *asm_lines,
55 CORE_ADDR pc, int count)
56{
57 struct ui_file *gdb_dis_out;
58
59 /* Now init the ui_file structure. */
60 gdb_dis_out = tui_sfileopen (256);
61
62 /* Now construct each line. */
63 for (; count > 0; count--, asm_lines++)
64 {
65 if (asm_lines->addr_string)
66 xfree (asm_lines->addr_string);
67 if (asm_lines->insn)
68 xfree (asm_lines->insn);
69
70 print_address (gdbarch, pc, gdb_dis_out);
71 asm_lines->addr = pc;
72 asm_lines->addr_string = xstrdup (tui_file_get_strbuf (gdb_dis_out));
73
74 ui_file_rewind (gdb_dis_out);
75
76 pc = pc + gdb_print_insn (gdbarch, pc, gdb_dis_out, NULL);
77
78 asm_lines->insn = xstrdup (tui_file_get_strbuf (gdb_dis_out));
79
80 /* Reset the buffer to empty. */
81 ui_file_rewind (gdb_dis_out);
82 }
83 ui_file_delete (gdb_dis_out);
84 return pc;
85}
86
87/* Find the disassembly address that corresponds to FROM lines above
88 or below the PC. Variable sized instructions are taken into
89 account by the algorithm. */
90static CORE_ADDR
91tui_find_disassembly_address (struct gdbarch *gdbarch, CORE_ADDR pc, int from)
92{
93 CORE_ADDR new_low;
94 int max_lines;
95 int i;
96 struct tui_asm_line *asm_lines;
97
98 max_lines = (from > 0) ? from : - from;
99 if (max_lines <= 1)
100 return pc;
101
102 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
103 * max_lines);
104 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
105
106 new_low = pc;
107 if (from > 0)
108 {
109 tui_disassemble (gdbarch, asm_lines, pc, max_lines);
110 new_low = asm_lines[max_lines - 1].addr;
111 }
112 else
113 {
114 CORE_ADDR last_addr;
115 int pos;
116 struct minimal_symbol *msymbol;
117
118 /* Find backward an address which is a symbol and for which
119 disassembling from that address will fill completely the
120 window. */
121 pos = max_lines - 1;
122 do {
123 new_low -= 1 * max_lines;
124 msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0);
125
126 if (msymbol)
127 new_low = SYMBOL_VALUE_ADDRESS (msymbol);
128 else
129 new_low += 1 * max_lines;
130
131 tui_disassemble (gdbarch, asm_lines, new_low, max_lines);
132 last_addr = asm_lines[pos].addr;
133 } while (last_addr > pc && msymbol);
134
135 /* Scan forward disassembling one instruction at a time until
136 the last visible instruction of the window matches the pc.
137 We keep the disassembled instructions in the 'lines' window
138 and shift it downward (increasing its addresses). */
139 if (last_addr < pc)
140 do
141 {
142 CORE_ADDR next_addr;
143
144 pos++;
145 if (pos >= max_lines)
146 pos = 0;
147
148 next_addr = tui_disassemble (gdbarch, &asm_lines[pos],
149 last_addr, 1);
150
151 /* If there are some problems while disassembling exit. */
152 if (next_addr <= last_addr)
153 break;
154 last_addr = next_addr;
155 } while (last_addr <= pc);
156 pos++;
157 if (pos >= max_lines)
158 pos = 0;
159 new_low = asm_lines[pos].addr;
160 }
161 for (i = 0; i < max_lines; i++)
162 {
163 xfree (asm_lines[i].addr_string);
164 xfree (asm_lines[i].insn);
165 }
166 return new_low;
167}
168
169/* Function to set the disassembly window's content. */
170enum tui_status
171tui_set_disassem_content (struct gdbarch *gdbarch, CORE_ADDR pc)
172{
173 enum tui_status ret = TUI_FAILURE;
174 int i;
175 int offset = TUI_DISASM_WIN->detail.source_info.horizontal_offset;
ef5ccd6c 176 int max_lines;
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177 CORE_ADDR cur_pc;
178 struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
179 int tab_len = tui_default_tab_len ();
180 struct tui_asm_line *asm_lines;
181 int insn_pos;
182 int addr_size, max_size;
183 char *line;
184
185 if (pc == 0)
186 return TUI_FAILURE;
187
188 ret = tui_alloc_source_buffer (TUI_DISASM_WIN);
189 if (ret != TUI_SUCCESS)
190 return ret;
191
192 TUI_DISASM_WIN->detail.source_info.gdbarch = gdbarch;
193 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.loa = LOA_ADDRESS;
194 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.u.addr = pc;
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195 cur_pc = (CORE_ADDR) (((struct tui_win_element *)
196 locator->content[0])->which_element.locator.addr);
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197
198 max_lines = TUI_DISASM_WIN->generic.height - 2; /* Account for
199 hilite. */
200
201 /* Get temporary table that will hold all strings (addr & insn). */
202 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
203 * max_lines);
204 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
205
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206 tui_disassemble (gdbarch, asm_lines, pc, max_lines);
207
208 /* See what is the maximum length of an address and of a line. */
209 addr_size = 0;
210 max_size = 0;
211 for (i = 0; i < max_lines; i++)
212 {
213 size_t len = strlen (asm_lines[i].addr_string);
cf7f2e2d 214
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215 if (len > addr_size)
216 addr_size = len;
217
218 len = strlen (asm_lines[i].insn) + tab_len;
219 if (len > max_size)
220 max_size = len;
221 }
222 max_size += addr_size + tab_len;
223
224 /* Allocate memory to create each line. */
225 line = (char*) alloca (max_size);
226 insn_pos = (1 + (addr_size / tab_len)) * tab_len;
227
228 /* Now construct each line. */
229 for (i = 0; i < max_lines; i++)
230 {
231 struct tui_win_element *element;
232 struct tui_source_element *src;
233 int cur_len;
234
235 element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i];
236 src = &element->which_element.source;
237 strcpy (line, asm_lines[i].addr_string);
238 cur_len = strlen (line);
239
240 /* Add spaces to make the instructions start on the same
241 column. */
242 while (cur_len < insn_pos)
243 {
244 strcat (line, " ");
245 cur_len++;
246 }
247
248 strcat (line, asm_lines[i].insn);
249
250 /* Now copy the line taking the offset into account. */
251 if (strlen (line) > offset)
252 strcpy (src->line, &line[offset]);
253 else
254 src->line[0] = '\0';
255
256 src->line_or_addr.loa = LOA_ADDRESS;
257 src->line_or_addr.u.addr = asm_lines[i].addr;
258 src->is_exec_point = asm_lines[i].addr == cur_pc;
259
260 /* See whether there is a breakpoint installed. */
261 src->has_break = (!src->is_exec_point
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262 && breakpoint_here_p (current_program_space->aspace,
263 pc)
cf7f2e2d 264 != no_breakpoint_here);
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265
266 xfree (asm_lines[i].addr_string);
267 xfree (asm_lines[i].insn);
268 }
269 TUI_DISASM_WIN->generic.content_size = i;
270 return TUI_SUCCESS;
271}
272
273
274/* Function to display the disassembly window with disassembled code. */
275void
276tui_show_disassem (struct gdbarch *gdbarch, CORE_ADDR start_addr)
277{
278 struct symtab *s = find_pc_symtab (start_addr);
279 struct tui_win_info *win_with_focus = tui_win_with_focus ();
280 struct tui_line_or_address val;
281
282 val.loa = LOA_ADDRESS;
283 val.u.addr = start_addr;
284 tui_add_win_to_layout (DISASSEM_WIN);
285 tui_update_source_window (TUI_DISASM_WIN, gdbarch, s, val, FALSE);
286
287 /* If the focus was in the src win, put it in the asm win, if the
288 source view isn't split. */
289 if (tui_current_layout () != SRC_DISASSEM_COMMAND
290 && win_with_focus == TUI_SRC_WIN)
291 tui_set_win_focus_to (TUI_DISASM_WIN);
292
293 return;
294}
295
296
297/* Function to display the disassembly window. */
298void
299tui_show_disassem_and_update_source (struct gdbarch *gdbarch,
300 CORE_ADDR start_addr)
301{
302 struct symtab_and_line sal;
303
304 tui_show_disassem (gdbarch, start_addr);
305 if (tui_current_layout () == SRC_DISASSEM_COMMAND)
306 {
307 struct tui_line_or_address val;
308
309 /* Update what is in the source window if it is displayed too,
310 note that it follows what is in the disassembly window and
311 visa-versa. */
312 sal = find_pc_line (start_addr, 0);
313 val.loa = LOA_LINE;
314 val.u.line_no = sal.line;
315 tui_update_source_window (TUI_SRC_WIN, gdbarch, sal.symtab, val, TRUE);
316 if (sal.symtab)
317 {
318 set_current_source_symtab_and_line (&sal);
ef5ccd6c 319 tui_update_locator_fullname (symtab_to_fullname (sal.symtab));
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320 }
321 else
ef5ccd6c 322 tui_update_locator_fullname ("?");
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323 }
324
325 return;
326}
327
328void
329tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p)
330{
331 struct tui_gen_win_info *locator;
332 struct tui_locator_element *element;
cf7f2e2d 333 struct gdbarch *gdbarch = get_current_arch ();
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334 CORE_ADDR addr;
335
336 locator = tui_locator_win_info_ptr ();
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337 element = &((struct tui_win_element *)
338 locator->content[0])->which_element.locator;
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339
340 if (element->addr == 0)
341 {
342 struct minimal_symbol *main_symbol;
343
344 /* Find address of the start of program.
345 Note: this should be language specific. */
346 main_symbol = lookup_minimal_symbol ("main", NULL, NULL);
347 if (main_symbol == 0)
348 main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL);
349 if (main_symbol == 0)
350 main_symbol = lookup_minimal_symbol ("_start", NULL, NULL);
351 if (main_symbol)
352 addr = SYMBOL_VALUE_ADDRESS (main_symbol);
353 else
354 addr = 0;
355 }
356 else /* The target is executing. */
357 {
358 gdbarch = element->gdbarch;
359 addr = element->addr;
360 }
361
362 *gdbarch_p = gdbarch;
363 *addr_p = addr;
364}
365
366/* Determine what the low address will be to display in the TUI's
367 disassembly window. This may or may not be the same as the low
368 address input. */
369CORE_ADDR
370tui_get_low_disassembly_address (struct gdbarch *gdbarch,
371 CORE_ADDR low, CORE_ADDR pc)
372{
373 int pos;
374
375 /* Determine where to start the disassembly so that the pc is about
376 in the middle of the viewport. */
377 pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2;
378 pc = tui_find_disassembly_address (gdbarch, pc, -pos);
379
380 if (pc < low)
381 pc = low;
382 return pc;
383}
384
385/* Scroll the disassembly forward or backward vertically. */
386void
387tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction,
388 int num_to_scroll)
389{
390 if (TUI_DISASM_WIN->generic.content != NULL)
391 {
392 struct gdbarch *gdbarch = TUI_DISASM_WIN->detail.source_info.gdbarch;
393 CORE_ADDR pc;
394 tui_win_content content;
395 struct tui_line_or_address val;
396 int dir;
397
398 content = (tui_win_content) TUI_DISASM_WIN->generic.content;
399
400 pc = content[0]->which_element.source.line_or_addr.u.addr;
401 num_to_scroll++;
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402 dir = (scroll_direction == FORWARD_SCROLL)
403 ? num_to_scroll : -num_to_scroll;
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404
405 val.loa = LOA_ADDRESS;
406 val.u.addr = tui_find_disassembly_address (gdbarch, pc, dir);
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407 tui_update_source_window_as_is (TUI_DISASM_WIN, gdbarch,
408 NULL, val, FALSE);
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409 }
410}