1 /* Disassembly display.
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007
4 Free Software Foundation, Inc.
6 Contributed by Hewlett-Packard Company.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
27 #include "breakpoint.h"
32 #include "gdb_string.h"
34 #include "tui/tui-data.h"
35 #include "tui/tui-win.h"
36 #include "tui/tui-layout.h"
37 #include "tui/tui-winsource.h"
38 #include "tui/tui-stack.h"
39 #include "tui/tui-file.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 tui_asm_line *asm_lines, CORE_ADDR pc, int count)
56 struct ui_file *gdb_dis_out;
58 /* Now init the ui_file structure. */
59 gdb_dis_out = tui_sfileopen (256);
61 /* Now construct each line. */
62 for (; count > 0; count--, asm_lines++)
64 if (asm_lines->addr_string)
65 xfree (asm_lines->addr_string);
67 xfree (asm_lines->insn);
69 print_address (pc, gdb_dis_out);
71 asm_lines->addr_string = xstrdup (tui_file_get_strbuf (gdb_dis_out));
73 ui_file_rewind (gdb_dis_out);
75 pc = pc + gdb_print_insn (pc, gdb_dis_out, NULL);
77 asm_lines->insn = xstrdup (tui_file_get_strbuf (gdb_dis_out));
79 /* Reset the buffer to empty. */
80 ui_file_rewind (gdb_dis_out);
82 ui_file_delete (gdb_dis_out);
86 /* Find the disassembly address that corresponds to FROM lines above
87 or below the PC. Variable sized instructions are taken into
88 account by the algorithm. */
90 tui_find_disassembly_address (CORE_ADDR pc, int from)
95 struct tui_asm_line *asm_lines;
97 max_lines = (from > 0) ? from : - from;
101 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
103 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
108 tui_disassemble (asm_lines, pc, max_lines);
109 new_low = asm_lines[max_lines - 1].addr;
115 struct minimal_symbol *msymbol;
117 /* Find backward an address which is a symbol and for which
118 disassembling from that address will fill completely the
122 new_low -= 1 * max_lines;
123 msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0);
126 new_low = SYMBOL_VALUE_ADDRESS (msymbol);
128 new_low += 1 * max_lines;
130 tui_disassemble (asm_lines, new_low, max_lines);
131 last_addr = asm_lines[pos].addr;
132 } while (last_addr > pc && msymbol);
134 /* Scan forward disassembling one instruction at a time until
135 the last visible instruction of the window matches the pc.
136 We keep the disassembled instructions in the 'lines' window
137 and shift it downward (increasing its addresses). */
144 if (pos >= max_lines)
147 next_addr = tui_disassemble (&asm_lines[pos], last_addr, 1);
149 /* If there are some problems while disassembling exit. */
150 if (next_addr <= last_addr)
152 last_addr = next_addr;
153 } while (last_addr <= pc);
155 if (pos >= max_lines)
157 new_low = asm_lines[pos].addr;
159 for (i = 0; i < max_lines; i++)
161 xfree (asm_lines[i].addr_string);
162 xfree (asm_lines[i].insn);
167 /* Function to set the disassembly window's content. */
169 tui_set_disassem_content (CORE_ADDR pc)
171 enum tui_status ret = TUI_FAILURE;
173 int offset = TUI_DISASM_WIN->detail.source_info.horizontal_offset;
174 int line_width, max_lines;
176 struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
177 int tab_len = tui_default_tab_len ();
178 struct tui_asm_line *asm_lines;
180 int addr_size, max_size;
186 ret = tui_alloc_source_buffer (TUI_DISASM_WIN);
187 if (ret != TUI_SUCCESS)
190 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.loa = LOA_ADDRESS;
191 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.u.addr = pc;
193 (((struct tui_win_element *) locator->content[0])->which_element.locator.addr);
195 max_lines = TUI_DISASM_WIN->generic.height - 2; /* Account for
198 /* Get temporary table that will hold all strings (addr & insn). */
199 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
201 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
203 line_width = TUI_DISASM_WIN->generic.width - 1;
205 tui_disassemble (asm_lines, pc, max_lines);
207 /* See what is the maximum length of an address and of a line. */
210 for (i = 0; i < max_lines; i++)
212 size_t len = strlen (asm_lines[i].addr_string);
216 len = strlen (asm_lines[i].insn) + tab_len;
220 max_size += addr_size + tab_len;
222 /* Allocate memory to create each line. */
223 line = (char*) alloca (max_size);
224 insn_pos = (1 + (addr_size / tab_len)) * tab_len;
226 /* Now construct each line. */
227 for (i = 0; i < max_lines; i++)
229 struct tui_win_element *element;
230 struct tui_source_element *src;
233 element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i];
234 src = &element->which_element.source;
235 strcpy (line, asm_lines[i].addr_string);
236 cur_len = strlen (line);
238 /* Add spaces to make the instructions start on the same
240 while (cur_len < insn_pos)
246 strcat (line, asm_lines[i].insn);
248 /* Now copy the line taking the offset into account. */
249 if (strlen (line) > offset)
250 strcpy (src->line, &line[offset]);
254 src->line_or_addr.loa = LOA_ADDRESS;
255 src->line_or_addr.u.addr = asm_lines[i].addr;
256 src->is_exec_point = asm_lines[i].addr == cur_pc;
258 /* See whether there is a breakpoint installed. */
259 src->has_break = (!src->is_exec_point
260 && breakpoint_here_p (pc) != no_breakpoint_here);
262 xfree (asm_lines[i].addr_string);
263 xfree (asm_lines[i].insn);
265 TUI_DISASM_WIN->generic.content_size = i;
270 /* Function to display the disassembly window with disassembled code. */
272 tui_show_disassem (CORE_ADDR start_addr)
274 struct symtab *s = find_pc_symtab (start_addr);
275 struct tui_win_info *win_with_focus = tui_win_with_focus ();
276 struct tui_line_or_address val;
278 val.loa = LOA_ADDRESS;
279 val.u.addr = start_addr;
280 tui_add_win_to_layout (DISASSEM_WIN);
281 tui_update_source_window (TUI_DISASM_WIN, s, val, FALSE);
283 ** If the focus was in the src win, put it in the asm win, if
284 ** the source view isn't split.
286 if (tui_current_layout () != SRC_DISASSEM_COMMAND && win_with_focus == TUI_SRC_WIN)
287 tui_set_win_focus_to (TUI_DISASM_WIN);
293 /* Function to display the disassembly window. */
295 tui_show_disassem_and_update_source (CORE_ADDR start_addr)
297 struct symtab_and_line sal;
299 tui_show_disassem (start_addr);
300 if (tui_current_layout () == SRC_DISASSEM_COMMAND)
302 struct tui_line_or_address val;
305 ** Update what is in the source window if it is displayed too,
306 ** note that it follows what is in the disassembly window and
309 sal = find_pc_line (start_addr, 0);
311 val.u.line_no = sal.line;
312 tui_update_source_window (TUI_SRC_WIN, sal.symtab, val, TRUE);
315 set_current_source_symtab_and_line (&sal);
316 tui_update_locator_filename (sal.symtab->filename);
319 tui_update_locator_filename ("?");
326 tui_get_begin_asm_address (void)
328 struct tui_gen_win_info *locator;
329 struct tui_locator_element *element;
332 locator = tui_locator_win_info_ptr ();
333 element = &((struct tui_win_element *) locator->content[0])->which_element.locator;
335 if (element->addr == 0)
337 struct minimal_symbol *main_symbol;
339 /* Find address of the start of program.
340 Note: this should be language specific. */
341 main_symbol = lookup_minimal_symbol ("main", NULL, NULL);
342 if (main_symbol == 0)
343 main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL);
344 if (main_symbol == 0)
345 main_symbol = lookup_minimal_symbol ("_start", NULL, NULL);
347 addr = SYMBOL_VALUE_ADDRESS (main_symbol);
351 else /* The target is executing. */
352 addr = element->addr;
357 /* Determine what the low address will be to display in the TUI's
358 disassembly window. This may or may not be the same as the low
361 tui_get_low_disassembly_address (CORE_ADDR low, CORE_ADDR pc)
365 /* Determine where to start the disassembly so that the pc is about
366 in the middle of the viewport. */
367 pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2;
368 pc = tui_find_disassembly_address (pc, -pos);
375 /* Scroll the disassembly forward or backward vertically. */
377 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction,
380 if (TUI_DISASM_WIN->generic.content != NULL)
383 tui_win_content content;
385 struct tui_line_or_address val;
387 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
389 content = (tui_win_content) TUI_DISASM_WIN->generic.content;
390 if (cursal.symtab == (struct symtab *) NULL)
391 s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL)));
395 /* Account for hilite. */
396 max_lines = TUI_DISASM_WIN->generic.height - 2;
397 pc = content[0]->which_element.source.line_or_addr.u.addr;
398 dir = (scroll_direction == FORWARD_SCROLL) ? max_lines : - max_lines;
400 val.loa = LOA_ADDRESS;
401 val.u.addr = tui_find_disassembly_address (pc, dir);
402 tui_update_source_window_as_is (TUI_DISASM_WIN, s, val, FALSE);