1 /* Disassembly display.
3 Copyright (C) 1998-2014 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"
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"
42 #include "gdb_curses.h"
51 /* Function to set the disassembly window's content.
52 Disassemble count lines starting at pc.
53 Return address of the count'th instruction after pc. */
55 tui_disassemble (struct gdbarch
*gdbarch
, struct tui_asm_line
*asm_lines
,
56 CORE_ADDR pc
, int count
)
58 struct ui_file
*gdb_dis_out
;
60 /* Now init the ui_file structure. */
61 gdb_dis_out
= tui_sfileopen (256);
63 /* Now construct each line. */
64 for (; count
> 0; count
--, asm_lines
++)
66 if (asm_lines
->addr_string
)
67 xfree (asm_lines
->addr_string
);
69 xfree (asm_lines
->insn
);
71 print_address (gdbarch
, pc
, gdb_dis_out
);
73 asm_lines
->addr_string
= xstrdup (tui_file_get_strbuf (gdb_dis_out
));
75 ui_file_rewind (gdb_dis_out
);
77 pc
= pc
+ gdb_print_insn (gdbarch
, pc
, gdb_dis_out
, NULL
);
79 asm_lines
->insn
= xstrdup (tui_file_get_strbuf (gdb_dis_out
));
81 /* Reset the buffer to empty. */
82 ui_file_rewind (gdb_dis_out
);
84 ui_file_delete (gdb_dis_out
);
88 /* Find the disassembly address that corresponds to FROM lines above
89 or below the PC. Variable sized instructions are taken into
90 account by the algorithm. */
92 tui_find_disassembly_address (struct gdbarch
*gdbarch
, CORE_ADDR pc
, int from
)
97 struct tui_asm_line
*asm_lines
;
99 max_lines
= (from
> 0) ? from
: - from
;
103 asm_lines
= (struct tui_asm_line
*) alloca (sizeof (struct tui_asm_line
)
105 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
110 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
111 new_low
= asm_lines
[max_lines
- 1].addr
;
117 struct bound_minimal_symbol msymbol
;
119 /* Find backward an address which is a symbol and for which
120 disassembling from that address will fill completely the
124 new_low
-= 1 * max_lines
;
125 msymbol
= lookup_minimal_symbol_by_pc_section (new_low
, 0);
128 new_low
= BMSYMBOL_VALUE_ADDRESS (msymbol
);
130 new_low
+= 1 * max_lines
;
132 tui_disassemble (gdbarch
, asm_lines
, new_low
, max_lines
);
133 last_addr
= asm_lines
[pos
].addr
;
134 } while (last_addr
> pc
&& msymbol
.minsym
);
136 /* Scan forward disassembling one instruction at a time until
137 the last visible instruction of the window matches the pc.
138 We keep the disassembled instructions in the 'lines' window
139 and shift it downward (increasing its addresses). */
146 if (pos
>= max_lines
)
149 next_addr
= tui_disassemble (gdbarch
, &asm_lines
[pos
],
152 /* If there are some problems while disassembling exit. */
153 if (next_addr
<= last_addr
)
155 last_addr
= next_addr
;
156 } while (last_addr
<= pc
);
158 if (pos
>= max_lines
)
160 new_low
= asm_lines
[pos
].addr
;
162 for (i
= 0; i
< max_lines
; i
++)
164 xfree (asm_lines
[i
].addr_string
);
165 xfree (asm_lines
[i
].insn
);
170 /* Function to set the disassembly window's content. */
172 tui_set_disassem_content (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
174 enum tui_status ret
= TUI_FAILURE
;
176 int offset
= TUI_DISASM_WIN
->detail
.source_info
.horizontal_offset
;
179 struct tui_gen_win_info
*locator
= tui_locator_win_info_ptr ();
180 int tab_len
= tui_default_tab_len ();
181 struct tui_asm_line
*asm_lines
;
183 int addr_size
, max_size
;
189 ret
= tui_alloc_source_buffer (TUI_DISASM_WIN
);
190 if (ret
!= TUI_SUCCESS
)
193 TUI_DISASM_WIN
->detail
.source_info
.gdbarch
= gdbarch
;
194 TUI_DISASM_WIN
->detail
.source_info
.start_line_or_addr
.loa
= LOA_ADDRESS
;
195 TUI_DISASM_WIN
->detail
.source_info
.start_line_or_addr
.u
.addr
= pc
;
196 cur_pc
= (CORE_ADDR
) (((struct tui_win_element
*)
197 locator
->content
[0])->which_element
.locator
.addr
);
199 max_lines
= TUI_DISASM_WIN
->generic
.height
- 2; /* Account for
202 /* Get temporary table that will hold all strings (addr & insn). */
203 asm_lines
= (struct tui_asm_line
*) alloca (sizeof (struct tui_asm_line
)
205 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
207 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
209 /* See what is the maximum length of an address and of a line. */
212 for (i
= 0; i
< max_lines
; i
++)
214 size_t len
= strlen (asm_lines
[i
].addr_string
);
219 len
= strlen (asm_lines
[i
].insn
) + tab_len
;
223 max_size
+= addr_size
+ tab_len
;
225 /* Allocate memory to create each line. */
226 line
= (char*) alloca (max_size
);
227 insn_pos
= (1 + (addr_size
/ tab_len
)) * tab_len
;
229 /* Now construct each line. */
230 for (i
= 0; i
< max_lines
; i
++)
232 struct tui_win_element
*element
;
233 struct tui_source_element
*src
;
236 element
= (struct tui_win_element
*) TUI_DISASM_WIN
->generic
.content
[i
];
237 src
= &element
->which_element
.source
;
238 strcpy (line
, asm_lines
[i
].addr_string
);
239 cur_len
= strlen (line
);
241 /* Add spaces to make the instructions start on the same
243 while (cur_len
< insn_pos
)
249 strcat (line
, asm_lines
[i
].insn
);
251 /* Now copy the line taking the offset into account. */
252 if (strlen (line
) > offset
)
253 strcpy (src
->line
, &line
[offset
]);
257 src
->line_or_addr
.loa
= LOA_ADDRESS
;
258 src
->line_or_addr
.u
.addr
= asm_lines
[i
].addr
;
259 src
->is_exec_point
= asm_lines
[i
].addr
== cur_pc
;
261 /* See whether there is a breakpoint installed. */
262 src
->has_break
= (!src
->is_exec_point
263 && breakpoint_here_p (current_program_space
->aspace
,
265 != no_breakpoint_here
);
267 xfree (asm_lines
[i
].addr_string
);
268 xfree (asm_lines
[i
].insn
);
270 TUI_DISASM_WIN
->generic
.content_size
= i
;
275 /* Function to display the disassembly window with disassembled code. */
277 tui_show_disassem (struct gdbarch
*gdbarch
, CORE_ADDR start_addr
)
279 struct symtab
*s
= find_pc_symtab (start_addr
);
280 struct tui_win_info
*win_with_focus
= tui_win_with_focus ();
281 struct tui_line_or_address val
;
283 val
.loa
= LOA_ADDRESS
;
284 val
.u
.addr
= start_addr
;
285 tui_add_win_to_layout (DISASSEM_WIN
);
286 tui_update_source_window (TUI_DISASM_WIN
, gdbarch
, s
, val
, FALSE
);
288 /* If the focus was in the src win, put it in the asm win, if the
289 source view isn't split. */
290 if (tui_current_layout () != SRC_DISASSEM_COMMAND
291 && win_with_focus
== TUI_SRC_WIN
)
292 tui_set_win_focus_to (TUI_DISASM_WIN
);
298 /* Function to display the disassembly window. */
300 tui_show_disassem_and_update_source (struct gdbarch
*gdbarch
,
301 CORE_ADDR start_addr
)
303 struct symtab_and_line sal
;
305 tui_show_disassem (gdbarch
, start_addr
);
306 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
308 struct tui_line_or_address val
;
310 /* Update what is in the source window if it is displayed too,
311 note that it follows what is in the disassembly window and
313 sal
= find_pc_line (start_addr
, 0);
315 val
.u
.line_no
= sal
.line
;
316 tui_update_source_window (TUI_SRC_WIN
, gdbarch
, sal
.symtab
, val
, TRUE
);
319 set_current_source_symtab_and_line (&sal
);
320 tui_update_locator_fullname (symtab_to_fullname (sal
.symtab
));
323 tui_update_locator_fullname ("?");
330 tui_get_begin_asm_address (struct gdbarch
**gdbarch_p
, CORE_ADDR
*addr_p
)
332 struct tui_gen_win_info
*locator
;
333 struct tui_locator_element
*element
;
334 struct gdbarch
*gdbarch
= get_current_arch ();
337 locator
= tui_locator_win_info_ptr ();
338 element
= &((struct tui_win_element
*)
339 locator
->content
[0])->which_element
.locator
;
341 if (element
->addr
== 0)
343 struct bound_minimal_symbol main_symbol
;
345 /* Find address of the start of program.
346 Note: this should be language specific. */
347 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
348 if (main_symbol
.minsym
== 0)
349 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
350 if (main_symbol
.minsym
== 0)
351 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
352 if (main_symbol
.minsym
)
353 addr
= BMSYMBOL_VALUE_ADDRESS (main_symbol
);
357 else /* The target is executing. */
359 gdbarch
= element
->gdbarch
;
360 addr
= element
->addr
;
363 *gdbarch_p
= gdbarch
;
367 /* Determine what the low address will be to display in the TUI's
368 disassembly window. This may or may not be the same as the low
371 tui_get_low_disassembly_address (struct gdbarch
*gdbarch
,
372 CORE_ADDR low
, CORE_ADDR pc
)
376 /* Determine where to start the disassembly so that the pc is about
377 in the middle of the viewport. */
378 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
379 pc
= tui_find_disassembly_address (gdbarch
, pc
, -pos
);
386 /* Scroll the disassembly forward or backward vertically. */
388 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction
,
391 if (TUI_DISASM_WIN
->generic
.content
!= NULL
)
393 struct gdbarch
*gdbarch
= TUI_DISASM_WIN
->detail
.source_info
.gdbarch
;
395 tui_win_content content
;
396 struct tui_line_or_address val
;
399 content
= (tui_win_content
) TUI_DISASM_WIN
->generic
.content
;
401 pc
= content
[0]->which_element
.source
.line_or_addr
.u
.addr
;
403 dir
= (scroll_direction
== FORWARD_SCROLL
)
404 ? num_to_scroll
: -num_to_scroll
;
406 val
.loa
= LOA_ADDRESS
;
407 val
.u
.addr
= tui_find_disassembly_address (gdbarch
, pc
, dir
);
408 tui_update_source_window_as_is (TUI_DISASM_WIN
, gdbarch
,