1 /* Disassembly display.
3 Copyright (C) 1998-2019 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"
31 #include "tui/tui-data.h"
32 #include "tui/tui-win.h"
33 #include "tui/tui-layout.h"
34 #include "tui/tui-winsource.h"
35 #include "tui/tui-stack.h"
36 #include "tui/tui-file.h"
37 #include "tui/tui-disasm.h"
38 #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 string_file gdb_dis_out;
59 /* Now construct each line. */
60 for (; count > 0; count--, asm_lines++)
62 xfree (asm_lines->addr_string);
63 xfree (asm_lines->insn);
65 print_address (gdbarch, pc, &gdb_dis_out);
67 asm_lines->addr_string = xstrdup (gdb_dis_out.c_str ());
71 pc = pc + gdb_print_insn (gdbarch, pc, &gdb_dis_out, NULL);
73 asm_lines->insn = xstrdup (gdb_dis_out.c_str ());
75 /* Reset the buffer to empty. */
81 /* Find the disassembly address that corresponds to FROM lines above
82 or below the PC. Variable sized instructions are taken into
83 account by the algorithm. */
85 tui_find_disassembly_address (struct gdbarch *gdbarch, CORE_ADDR pc, int from)
90 struct tui_asm_line *asm_lines;
92 max_lines = (from > 0) ? from : - from;
96 asm_lines = XALLOCAVEC (struct tui_asm_line, max_lines);
97 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
102 tui_disassemble (gdbarch, asm_lines, pc, max_lines);
103 new_low = asm_lines[max_lines - 1].addr;
109 struct bound_minimal_symbol msymbol;
111 /* Find backward an address which is a symbol and for which
112 disassembling from that address will fill completely the
116 new_low -= 1 * max_lines;
117 msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0);
120 new_low = BMSYMBOL_VALUE_ADDRESS (msymbol);
122 new_low += 1 * max_lines;
124 tui_disassemble (gdbarch, asm_lines, new_low, max_lines);
125 last_addr = asm_lines[pos].addr;
126 } while (last_addr > pc && msymbol.minsym);
128 /* Scan forward disassembling one instruction at a time until
129 the last visible instruction of the window matches the pc.
130 We keep the disassembled instructions in the 'lines' window
131 and shift it downward (increasing its addresses). */
138 if (pos >= max_lines)
141 next_addr = tui_disassemble (gdbarch, &asm_lines[pos],
144 /* If there are some problems while disassembling exit. */
145 if (next_addr <= last_addr)
147 last_addr = next_addr;
148 } while (last_addr <= pc);
150 if (pos >= max_lines)
152 new_low = asm_lines[pos].addr;
154 for (i = 0; i < max_lines; i++)
156 xfree (asm_lines[i].addr_string);
157 xfree (asm_lines[i].insn);
162 /* Function to set the disassembly window's content. */
164 tui_set_disassem_content (struct gdbarch *gdbarch, CORE_ADDR pc)
167 int offset = TUI_DISASM_WIN->horizontal_offset;
168 int max_lines, line_width;
170 struct tui_locator_window *locator = tui_locator_win_info_ptr ();
171 int tab_len = tui_tab_width;
172 struct tui_asm_line *asm_lines;
174 int addr_size, insn_size;
180 tui_alloc_source_buffer (TUI_DISASM_WIN);
182 tui_source_window_base *base = TUI_DISASM_WIN;
183 base->gdbarch = gdbarch;
184 base->start_line_or_addr.loa = LOA_ADDRESS;
185 base->start_line_or_addr.u.addr = pc;
186 cur_pc = locator->addr;
188 /* Window size, excluding highlight box. */
189 max_lines = TUI_DISASM_WIN->height - 2;
190 line_width = TUI_DISASM_WIN->width - 2;
192 /* Get temporary table that will hold all strings (addr & insn). */
193 asm_lines = XALLOCAVEC (struct tui_asm_line, max_lines);
194 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);
196 tui_disassemble (gdbarch, asm_lines, pc, max_lines);
198 /* Determine maximum address- and instruction lengths. */
201 for (i = 0; i < max_lines; i++)
203 size_t len = strlen (asm_lines[i].addr_string);
208 len = strlen (asm_lines[i].insn);
213 /* Align instructions to the same column. */
214 insn_pos = (1 + (addr_size / tab_len)) * tab_len;
216 /* Allocate memory to create each line. */
217 line = (char*) alloca (insn_pos + insn_size + 1);
219 /* Now construct each line. */
220 TUI_DISASM_WIN->content.resize (max_lines);
221 for (i = 0; i < max_lines; i++)
225 tui_source_element *src = &TUI_DISASM_WIN->content[i];
226 strcpy (line, asm_lines[i].addr_string);
227 cur_len = strlen (line);
228 memset (line + cur_len, ' ', insn_pos - cur_len);
229 strcpy (line + insn_pos, asm_lines[i].insn);
231 /* Now copy the line taking the offset into account. */
233 if (strlen (line) > offset)
234 src->line = xstrndup (&line[offset], line_width);
236 src->line = xstrdup ("");
238 src->line_or_addr.loa = LOA_ADDRESS;
239 src->line_or_addr.u.addr = asm_lines[i].addr;
240 src->is_exec_point = asm_lines[i].addr == cur_pc;
242 xfree (asm_lines[i].addr_string);
243 xfree (asm_lines[i].insn);
249 /* Function to display the disassembly window with disassembled code. */
251 tui_show_disassem (struct gdbarch *gdbarch, CORE_ADDR start_addr)
253 struct symtab *s = find_pc_line_symtab (start_addr);
254 struct tui_win_info *win_with_focus = tui_win_with_focus ();
255 struct tui_line_or_address val;
257 val.loa = LOA_ADDRESS;
258 val.u.addr = start_addr;
259 tui_add_win_to_layout (DISASSEM_WIN);
260 tui_update_source_window (TUI_DISASM_WIN, gdbarch, s, val, FALSE);
262 /* If the focus was in the src win, put it in the asm win, if the
263 source view isn't split. */
264 if (tui_current_layout () != SRC_DISASSEM_COMMAND
265 && win_with_focus == TUI_SRC_WIN)
266 tui_set_win_focus_to (TUI_DISASM_WIN);
272 /* Function to display the disassembly window. */
274 tui_show_disassem_and_update_source (struct gdbarch *gdbarch,
275 CORE_ADDR start_addr)
277 struct symtab_and_line sal;
279 tui_show_disassem (gdbarch, start_addr);
280 if (tui_current_layout () == SRC_DISASSEM_COMMAND)
282 struct tui_line_or_address val;
284 /* Update what is in the source window if it is displayed too,
285 note that it follows what is in the disassembly window and
287 sal = find_pc_line (start_addr, 0);
289 val.u.line_no = sal.line;
290 tui_update_source_window (TUI_SRC_WIN, gdbarch, sal.symtab, val, TRUE);
293 set_current_source_symtab_and_line (sal);
294 tui_update_locator_fullname (symtab_to_fullname (sal.symtab));
297 tui_update_locator_fullname ("?");
304 tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p)
306 struct tui_locator_window *locator;
307 struct gdbarch *gdbarch = get_current_arch ();
310 locator = tui_locator_win_info_ptr ();
312 if (locator->addr == 0)
314 struct bound_minimal_symbol main_symbol;
316 /* Find address of the start of program.
317 Note: this should be language specific. */
318 main_symbol = lookup_minimal_symbol ("main", NULL, NULL);
319 if (main_symbol.minsym == 0)
320 main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL);
321 if (main_symbol.minsym == 0)
322 main_symbol = lookup_minimal_symbol ("_start", NULL, NULL);
323 if (main_symbol.minsym)
324 addr = BMSYMBOL_VALUE_ADDRESS (main_symbol);
328 else /* The target is executing. */
330 gdbarch = locator->gdbarch;
331 addr = locator->addr;
334 *gdbarch_p = gdbarch;
338 /* Determine what the low address will be to display in the TUI's
339 disassembly window. This may or may not be the same as the low
342 tui_get_low_disassembly_address (struct gdbarch *gdbarch,
343 CORE_ADDR low, CORE_ADDR pc)
347 /* Determine where to start the disassembly so that the pc is about
348 in the middle of the viewport. */
349 pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2;
350 pc = tui_find_disassembly_address (gdbarch, pc, -pos);
357 /* Scroll the disassembly forward or backward vertically. */
359 tui_disasm_window::do_scroll_vertical (int num_to_scroll)
361 if (!content.empty ())
364 struct tui_line_or_address val;
366 pc = content[0].line_or_addr.u.addr;
367 if (num_to_scroll >= 0)
372 val.loa = LOA_ADDRESS;
373 val.u.addr = tui_find_disassembly_address (gdbarch, pc, num_to_scroll);
374 tui_update_source_window_as_is (this, gdbarch,