1 /* Disassembly display.
3 Copyright (C) 1998-2013 Free Software Foundation, Inc.
5 Contributed by Hewlett-Packard Company.
7 This file is part of GDB.
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.
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.
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/>. */
23 #include "arch-utils.h"
25 #include "breakpoint.h"
30 #include "gdb_string.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"
39 #include "progspace.h"
41 #include "gdb_curses.h"
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. */
54 tui_disassemble (struct gdbarch *gdbarch, struct tui_asm_line *asm_lines,
55 CORE_ADDR pc, int count)
57 struct ui_file *gdb_dis_out;
59 /* Now init the ui_file structure. */
60 gdb_dis_out = tui_sfileopen (256);
62 /* Now construct each line. */
63 for (; count > 0; count--, asm_lines++)
65 if (asm_lines->addr_string)
66 xfree (asm_lines->addr_string);
68 xfree (asm_lines->insn);
70 print_address (gdbarch, pc, gdb_dis_out);
72 asm_lines->addr_string = xstrdup (tui_file_get_strbuf (gdb_dis_out));
74 ui_file_rewind (gdb_dis_out);
76 pc = pc + gdb_print_insn (gdbarch, pc, gdb_dis_out, NULL);
78 asm_lines->insn = xstrdup (tui_file_get_strbuf (gdb_dis_out));
80 /* Reset the buffer to empty. */
81 ui_file_rewind (gdb_dis_out);
83 ui_file_delete (gdb_dis_out);
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. */
91 tui_find_disassembly_address (struct gdbarch *gdbarch, CORE_ADDR pc, int from)
96 struct tui_asm_line *asm_lines;
98 max_lines = (from > 0) ? from : - from;
102 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
104 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
109 tui_disassemble (gdbarch, asm_lines, pc, max_lines);
110 new_low = asm_lines[max_lines - 1].addr;
116 struct minimal_symbol *msymbol;
118 /* Find backward an address which is a symbol and for which
119 disassembling from that address will fill completely the
123 new_low -= 1 * max_lines;
124 msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0);
127 new_low = SYMBOL_VALUE_ADDRESS (msymbol);
129 new_low += 1 * max_lines;
131 tui_disassemble (gdbarch, asm_lines, new_low, max_lines);
132 last_addr = asm_lines[pos].addr;
133 } while (last_addr > pc && msymbol);
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). */
145 if (pos >= max_lines)
148 next_addr = tui_disassemble (gdbarch, &asm_lines[pos],
151 /* If there are some problems while disassembling exit. */
152 if (next_addr <= last_addr)
154 last_addr = next_addr;
155 } while (last_addr <= pc);
157 if (pos >= max_lines)
159 new_low = asm_lines[pos].addr;
161 for (i = 0; i < max_lines; i++)
163 xfree (asm_lines[i].addr_string);
164 xfree (asm_lines[i].insn);
169 /* Function to set the disassembly window's content. */
171 tui_set_disassem_content (struct gdbarch *gdbarch, CORE_ADDR pc)
173 enum tui_status ret = TUI_FAILURE;
175 int offset = TUI_DISASM_WIN->detail.source_info.horizontal_offset;
176 int line_width, max_lines;
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;
182 int addr_size, max_size;
188 ret = tui_alloc_source_buffer (TUI_DISASM_WIN);
189 if (ret != TUI_SUCCESS)
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;
195 cur_pc = (CORE_ADDR) (((struct tui_win_element *)
196 locator->content[0])->which_element.locator.addr);
198 max_lines = TUI_DISASM_WIN->generic.height - 2; /* Account for
201 /* Get temporary table that will hold all strings (addr & insn). */
202 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
204 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
206 line_width = TUI_DISASM_WIN->generic.width - 1;
208 tui_disassemble (gdbarch, asm_lines, pc, max_lines);
210 /* See what is the maximum length of an address and of a line. */
213 for (i = 0; i < max_lines; i++)
215 size_t len = strlen (asm_lines[i].addr_string);
220 len = strlen (asm_lines[i].insn) + tab_len;
224 max_size += addr_size + tab_len;
226 /* Allocate memory to create each line. */
227 line = (char*) alloca (max_size);
228 insn_pos = (1 + (addr_size / tab_len)) * tab_len;
230 /* Now construct each line. */
231 for (i = 0; i < max_lines; i++)
233 struct tui_win_element *element;
234 struct tui_source_element *src;
237 element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i];
238 src = &element->which_element.source;
239 strcpy (line, asm_lines[i].addr_string);
240 cur_len = strlen (line);
242 /* Add spaces to make the instructions start on the same
244 while (cur_len < insn_pos)
250 strcat (line, asm_lines[i].insn);
252 /* Now copy the line taking the offset into account. */
253 if (strlen (line) > offset)
254 strcpy (src->line, &line[offset]);
258 src->line_or_addr.loa = LOA_ADDRESS;
259 src->line_or_addr.u.addr = asm_lines[i].addr;
260 src->is_exec_point = asm_lines[i].addr == cur_pc;
262 /* See whether there is a breakpoint installed. */
263 src->has_break = (!src->is_exec_point
264 && breakpoint_here_p (current_program_space->aspace,
266 != no_breakpoint_here);
268 xfree (asm_lines[i].addr_string);
269 xfree (asm_lines[i].insn);
271 TUI_DISASM_WIN->generic.content_size = i;
276 /* Function to display the disassembly window with disassembled code. */
278 tui_show_disassem (struct gdbarch *gdbarch, CORE_ADDR start_addr)
280 struct symtab *s = find_pc_symtab (start_addr);
281 struct tui_win_info *win_with_focus = tui_win_with_focus ();
282 struct tui_line_or_address val;
284 val.loa = LOA_ADDRESS;
285 val.u.addr = start_addr;
286 tui_add_win_to_layout (DISASSEM_WIN);
287 tui_update_source_window (TUI_DISASM_WIN, gdbarch, s, val, FALSE);
289 /* If the focus was in the src win, put it in the asm win, if the
290 source view isn't split. */
291 if (tui_current_layout () != SRC_DISASSEM_COMMAND
292 && win_with_focus == TUI_SRC_WIN)
293 tui_set_win_focus_to (TUI_DISASM_WIN);
299 /* Function to display the disassembly window. */
301 tui_show_disassem_and_update_source (struct gdbarch *gdbarch,
302 CORE_ADDR start_addr)
304 struct symtab_and_line sal;
306 tui_show_disassem (gdbarch, start_addr);
307 if (tui_current_layout () == SRC_DISASSEM_COMMAND)
309 struct tui_line_or_address val;
311 /* Update what is in the source window if it is displayed too,
312 note that it follows what is in the disassembly window and
314 sal = find_pc_line (start_addr, 0);
316 val.u.line_no = sal.line;
317 tui_update_source_window (TUI_SRC_WIN, gdbarch, sal.symtab, val, TRUE);
320 set_current_source_symtab_and_line (&sal);
321 tui_update_locator_filename (sal.symtab->filename);
324 tui_update_locator_filename ("?");
331 tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p)
333 struct tui_gen_win_info *locator;
334 struct tui_locator_element *element;
335 struct gdbarch *gdbarch = get_current_arch ();
338 locator = tui_locator_win_info_ptr ();
339 element = &((struct tui_win_element *)
340 locator->content[0])->which_element.locator;
342 if (element->addr == 0)
344 struct minimal_symbol *main_symbol;
346 /* Find address of the start of program.
347 Note: this should be language specific. */
348 main_symbol = lookup_minimal_symbol ("main", NULL, NULL);
349 if (main_symbol == 0)
350 main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL);
351 if (main_symbol == 0)
352 main_symbol = lookup_minimal_symbol ("_start", NULL, NULL);
354 addr = SYMBOL_VALUE_ADDRESS (main_symbol);
358 else /* The target is executing. */
360 gdbarch = element->gdbarch;
361 addr = element->addr;
364 *gdbarch_p = gdbarch;
368 /* Determine what the low address will be to display in the TUI's
369 disassembly window. This may or may not be the same as the low
372 tui_get_low_disassembly_address (struct gdbarch *gdbarch,
373 CORE_ADDR low, CORE_ADDR pc)
377 /* Determine where to start the disassembly so that the pc is about
378 in the middle of the viewport. */
379 pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2;
380 pc = tui_find_disassembly_address (gdbarch, pc, -pos);
387 /* Scroll the disassembly forward or backward vertically. */
389 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction,
392 if (TUI_DISASM_WIN->generic.content != NULL)
394 struct gdbarch *gdbarch = TUI_DISASM_WIN->detail.source_info.gdbarch;
396 tui_win_content content;
397 struct tui_line_or_address val;
400 content = (tui_win_content) TUI_DISASM_WIN->generic.content;
402 pc = content[0]->which_element.source.line_or_addr.u.addr;
404 dir = (scroll_direction == FORWARD_SCROLL)
405 ? num_to_scroll : -num_to_scroll;
407 val.loa = LOA_ADDRESS;
408 val.u.addr = tui_find_disassembly_address (gdbarch, pc, dir);
409 tui_update_source_window_as_is (TUI_DISASM_WIN, gdbarch,