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,
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 (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 (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 (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 (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 (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 (&asm_lines[pos], last_addr, 1);
150 /* If there are some problems while disassembling exit. */
151 if (next_addr <= last_addr)
153 last_addr = next_addr;
154 } while (last_addr <= pc);
156 if (pos >= max_lines)
158 new_low = asm_lines[pos].addr;
160 for (i = 0; i < max_lines; i++)
162 xfree (asm_lines[i].addr_string);
163 xfree (asm_lines[i].insn);
168 /* Function to set the disassembly window's content. */
170 tui_set_disassem_content (CORE_ADDR pc)
172 enum tui_status ret = TUI_FAILURE;
174 int offset = TUI_DISASM_WIN->detail.source_info.horizontal_offset;
175 int line_width, max_lines;
177 struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
178 int tab_len = tui_default_tab_len ();
179 struct tui_asm_line *asm_lines;
181 int addr_size, max_size;
187 ret = tui_alloc_source_buffer (TUI_DISASM_WIN);
188 if (ret != TUI_SUCCESS)
191 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.loa = LOA_ADDRESS;
192 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.u.addr = pc;
194 (((struct tui_win_element *) locator->content[0])->which_element.locator.addr);
196 max_lines = TUI_DISASM_WIN->generic.height - 2; /* Account for
199 /* Get temporary table that will hold all strings (addr & insn). */
200 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
202 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
204 line_width = TUI_DISASM_WIN->generic.width - 1;
206 tui_disassemble (asm_lines, pc, max_lines);
208 /* See what is the maximum length of an address and of a line. */
211 for (i = 0; i < max_lines; i++)
213 size_t len = strlen (asm_lines[i].addr_string);
217 len = strlen (asm_lines[i].insn) + tab_len;
221 max_size += addr_size + tab_len;
223 /* Allocate memory to create each line. */
224 line = (char*) alloca (max_size);
225 insn_pos = (1 + (addr_size / tab_len)) * tab_len;
227 /* Now construct each line. */
228 for (i = 0; i < max_lines; i++)
230 struct tui_win_element *element;
231 struct tui_source_element *src;
234 element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i];
235 src = &element->which_element.source;
236 strcpy (line, asm_lines[i].addr_string);
237 cur_len = strlen (line);
239 /* Add spaces to make the instructions start on the same
241 while (cur_len < insn_pos)
247 strcat (line, asm_lines[i].insn);
249 /* Now copy the line taking the offset into account. */
250 if (strlen (line) > offset)
251 strcpy (src->line, &line[offset]);
255 src->line_or_addr.loa = LOA_ADDRESS;
256 src->line_or_addr.u.addr = asm_lines[i].addr;
257 src->is_exec_point = asm_lines[i].addr == cur_pc;
259 /* See whether there is a breakpoint installed. */
260 src->has_break = (!src->is_exec_point
261 && breakpoint_here_p (pc) != no_breakpoint_here);
263 xfree (asm_lines[i].addr_string);
264 xfree (asm_lines[i].insn);
266 TUI_DISASM_WIN->generic.content_size = i;
271 /* Function to display the disassembly window with disassembled code. */
273 tui_show_disassem (CORE_ADDR start_addr)
275 struct symtab *s = find_pc_symtab (start_addr);
276 struct tui_win_info *win_with_focus = tui_win_with_focus ();
277 struct tui_line_or_address val;
279 val.loa = LOA_ADDRESS;
280 val.u.addr = start_addr;
281 tui_add_win_to_layout (DISASSEM_WIN);
282 tui_update_source_window (TUI_DISASM_WIN, s, val, FALSE);
284 /* If the focus was in the src win, put it in the asm win, if the
285 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;
304 /* Update what is in the source window if it is displayed too,
305 note that it follows what is in the disassembly window and
307 sal = find_pc_line (start_addr, 0);
309 val.u.line_no = sal.line;
310 tui_update_source_window (TUI_SRC_WIN, sal.symtab, val, TRUE);
313 set_current_source_symtab_and_line (&sal);
314 tui_update_locator_filename (sal.symtab->filename);
317 tui_update_locator_filename ("?");
324 tui_get_begin_asm_address (void)
326 struct tui_gen_win_info *locator;
327 struct tui_locator_element *element;
330 locator = tui_locator_win_info_ptr ();
331 element = &((struct tui_win_element *) locator->content[0])->which_element.locator;
333 if (element->addr == 0)
335 struct minimal_symbol *main_symbol;
337 /* Find address of the start of program.
338 Note: this should be language specific. */
339 main_symbol = lookup_minimal_symbol ("main", NULL, NULL);
340 if (main_symbol == 0)
341 main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL);
342 if (main_symbol == 0)
343 main_symbol = lookup_minimal_symbol ("_start", NULL, NULL);
345 addr = SYMBOL_VALUE_ADDRESS (main_symbol);
349 else /* The target is executing. */
350 addr = element->addr;
355 /* Determine what the low address will be to display in the TUI's
356 disassembly window. This may or may not be the same as the low
359 tui_get_low_disassembly_address (CORE_ADDR low,
364 /* Determine where to start the disassembly so that the pc is about
365 in the middle of the viewport. */
366 pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2;
367 pc = tui_find_disassembly_address (pc, -pos);
374 /* Scroll the disassembly forward or backward vertically. */
376 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction,
379 if (TUI_DISASM_WIN->generic.content != NULL)
382 tui_win_content content;
384 struct tui_line_or_address val;
386 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
388 content = (tui_win_content) TUI_DISASM_WIN->generic.content;
389 if (cursal.symtab == (struct symtab *) NULL)
390 s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL)));
394 /* Account for hilite. */
395 max_lines = TUI_DISASM_WIN->generic.height - 2;
396 pc = content[0]->which_element.source.line_or_addr.u.addr;
397 dir = (scroll_direction == FORWARD_SCROLL) ? max_lines : - max_lines;
399 val.loa = LOA_ADDRESS;
400 val.u.addr = tui_find_disassembly_address (pc, dir);
401 tui_update_source_window_as_is (TUI_DISASM_WIN, s, val, FALSE);