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 /* See whether there is a breakpoint installed. */
243 src->has_break = (!src->is_exec_point
244 && breakpoint_here_p (current_program_space->aspace,
246 != no_breakpoint_here);
248 xfree (asm_lines[i].addr_string);
249 xfree (asm_lines[i].insn);
255 /* Function to display the disassembly window with disassembled code. */
257 tui_show_disassem (struct gdbarch *gdbarch, CORE_ADDR start_addr)
259 struct symtab *s = find_pc_line_symtab (start_addr);
260 struct tui_win_info *win_with_focus = tui_win_with_focus ();
261 struct tui_line_or_address val;
263 val.loa = LOA_ADDRESS;
264 val.u.addr = start_addr;
265 tui_add_win_to_layout (DISASSEM_WIN);
266 tui_update_source_window (TUI_DISASM_WIN, gdbarch, s, val, FALSE);
268 /* If the focus was in the src win, put it in the asm win, if the
269 source view isn't split. */
270 if (tui_current_layout () != SRC_DISASSEM_COMMAND
271 && win_with_focus == TUI_SRC_WIN)
272 tui_set_win_focus_to (TUI_DISASM_WIN);
278 /* Function to display the disassembly window. */
280 tui_show_disassem_and_update_source (struct gdbarch *gdbarch,
281 CORE_ADDR start_addr)
283 struct symtab_and_line sal;
285 tui_show_disassem (gdbarch, start_addr);
286 if (tui_current_layout () == SRC_DISASSEM_COMMAND)
288 struct tui_line_or_address val;
290 /* Update what is in the source window if it is displayed too,
291 note that it follows what is in the disassembly window and
293 sal = find_pc_line (start_addr, 0);
295 val.u.line_no = sal.line;
296 tui_update_source_window (TUI_SRC_WIN, gdbarch, sal.symtab, val, TRUE);
299 set_current_source_symtab_and_line (sal);
300 tui_update_locator_fullname (symtab_to_fullname (sal.symtab));
303 tui_update_locator_fullname ("?");
310 tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p)
312 struct tui_locator_window *locator;
313 struct gdbarch *gdbarch = get_current_arch ();
316 locator = tui_locator_win_info_ptr ();
318 if (locator->addr == 0)
320 struct bound_minimal_symbol main_symbol;
322 /* Find address of the start of program.
323 Note: this should be language specific. */
324 main_symbol = lookup_minimal_symbol ("main", NULL, NULL);
325 if (main_symbol.minsym == 0)
326 main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL);
327 if (main_symbol.minsym == 0)
328 main_symbol = lookup_minimal_symbol ("_start", NULL, NULL);
329 if (main_symbol.minsym)
330 addr = BMSYMBOL_VALUE_ADDRESS (main_symbol);
334 else /* The target is executing. */
336 gdbarch = locator->gdbarch;
337 addr = locator->addr;
340 *gdbarch_p = gdbarch;
344 /* Determine what the low address will be to display in the TUI's
345 disassembly window. This may or may not be the same as the low
348 tui_get_low_disassembly_address (struct gdbarch *gdbarch,
349 CORE_ADDR low, CORE_ADDR pc)
353 /* Determine where to start the disassembly so that the pc is about
354 in the middle of the viewport. */
355 pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2;
356 pc = tui_find_disassembly_address (gdbarch, pc, -pos);
363 /* Scroll the disassembly forward or backward vertically. */
365 tui_disasm_window::do_scroll_vertical (int num_to_scroll)
367 if (!content.empty ())
370 struct tui_line_or_address val;
372 pc = content[0].line_or_addr.u.addr;
373 if (num_to_scroll >= 0)
378 val.loa = LOA_ADDRESS;
379 val.u.addr = tui_find_disassembly_address (gdbarch, pc, num_to_scroll);
380 tui_update_source_window_as_is (this, gdbarch,