1 /* Disassembly display.
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009,
4 2010 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 3 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, see <http://www.gnu.org/licenses/>. */
24 #include "arch-utils.h"
26 #include "breakpoint.h"
31 #include "gdb_string.h"
33 #include "tui/tui-data.h"
34 #include "tui/tui-win.h"
35 #include "tui/tui-layout.h"
36 #include "tui/tui-winsource.h"
37 #include "tui/tui-stack.h"
38 #include "tui/tui-file.h"
39 #include "tui/tui-disasm.h"
40 #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 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
= SYMBOL_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
);
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
;
177 int line_width
, max_lines
;
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
;
197 (((struct tui_win_element
*) 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 line_width
= TUI_DISASM_WIN
->generic
.width
- 1;
209 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
211 /* See what is the maximum length of an address and of a line. */
214 for (i
= 0; i
< max_lines
; i
++)
216 size_t len
= strlen (asm_lines
[i
].addr_string
);
220 len
= strlen (asm_lines
[i
].insn
) + tab_len
;
224 max_size
+= addr_size
+ tab_len
;
226 /* Allocate memory to create each line. */
227 line
= (char*) alloca (max_size
);
228 insn_pos
= (1 + (addr_size
/ tab_len
)) * tab_len
;
230 /* Now construct each line. */
231 for (i
= 0; i
< max_lines
; i
++)
233 struct tui_win_element
*element
;
234 struct tui_source_element
*src
;
237 element
= (struct tui_win_element
*) TUI_DISASM_WIN
->generic
.content
[i
];
238 src
= &element
->which_element
.source
;
239 strcpy (line
, asm_lines
[i
].addr_string
);
240 cur_len
= strlen (line
);
242 /* Add spaces to make the instructions start on the same
244 while (cur_len
< insn_pos
)
250 strcat (line
, asm_lines
[i
].insn
);
252 /* Now copy the line taking the offset into account. */
253 if (strlen (line
) > offset
)
254 strcpy (src
->line
, &line
[offset
]);
258 src
->line_or_addr
.loa
= LOA_ADDRESS
;
259 src
->line_or_addr
.u
.addr
= asm_lines
[i
].addr
;
260 src
->is_exec_point
= asm_lines
[i
].addr
== cur_pc
;
262 /* See whether there is a breakpoint installed. */
263 src
->has_break
= (!src
->is_exec_point
264 && breakpoint_here_p (current_program_space
->aspace
, pc
)
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_filename (sal
.symtab
->filename
);
323 tui_update_locator_filename ("?");
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
*) locator
->content
[0])->which_element
.locator
;
340 if (element
->addr
== 0)
342 struct minimal_symbol
*main_symbol
;
344 /* Find address of the start of program.
345 Note: this should be language specific. */
346 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
347 if (main_symbol
== 0)
348 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
349 if (main_symbol
== 0)
350 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
352 addr
= SYMBOL_VALUE_ADDRESS (main_symbol
);
356 else /* The target is executing. */
358 gdbarch
= element
->gdbarch
;
359 addr
= element
->addr
;
362 *gdbarch_p
= gdbarch
;
366 /* Determine what the low address will be to display in the TUI's
367 disassembly window. This may or may not be the same as the low
370 tui_get_low_disassembly_address (struct gdbarch
*gdbarch
,
371 CORE_ADDR low
, CORE_ADDR pc
)
375 /* Determine where to start the disassembly so that the pc is about
376 in the middle of the viewport. */
377 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
378 pc
= tui_find_disassembly_address (gdbarch
, pc
, -pos
);
385 /* Scroll the disassembly forward or backward vertically. */
387 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction
,
390 if (TUI_DISASM_WIN
->generic
.content
!= NULL
)
392 struct gdbarch
*gdbarch
= TUI_DISASM_WIN
->detail
.source_info
.gdbarch
;
394 tui_win_content content
;
395 struct tui_line_or_address val
;
398 content
= (tui_win_content
) TUI_DISASM_WIN
->generic
.content
;
400 pc
= content
[0]->which_element
.source
.line_or_addr
.u
.addr
;
402 dir
= (scroll_direction
== FORWARD_SCROLL
) ? num_to_scroll
: -num_to_scroll
;
404 val
.loa
= LOA_ADDRESS
;
405 val
.u
.addr
= tui_find_disassembly_address (gdbarch
, pc
, dir
);
406 tui_update_source_window_as_is (TUI_DISASM_WIN
, gdbarch
, NULL
, val
, FALSE
);