1 /* Disassembly display.
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009
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 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/>. */
25 #include "breakpoint.h"
30 #include "gdb_string.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"
39 #include "gdb_curses.h"
48 /* Function to set the disassembly window's content.
49 Disassemble count lines starting at pc.
50 Return address of the count'th instruction after pc. */
52 tui_disassemble (struct tui_asm_line
*asm_lines
,
53 CORE_ADDR pc
, int count
)
55 struct ui_file
*gdb_dis_out
;
57 /* Now init the ui_file structure. */
58 gdb_dis_out
= tui_sfileopen (256);
60 /* Now construct each line. */
61 for (; count
> 0; count
--, asm_lines
++)
63 if (asm_lines
->addr_string
)
64 xfree (asm_lines
->addr_string
);
66 xfree (asm_lines
->insn
);
68 print_address (pc
, gdb_dis_out
);
70 asm_lines
->addr_string
= xstrdup (tui_file_get_strbuf (gdb_dis_out
));
72 ui_file_rewind (gdb_dis_out
);
74 pc
= pc
+ gdb_print_insn (pc
, gdb_dis_out
, NULL
);
76 asm_lines
->insn
= xstrdup (tui_file_get_strbuf (gdb_dis_out
));
78 /* Reset the buffer to empty. */
79 ui_file_rewind (gdb_dis_out
);
81 ui_file_delete (gdb_dis_out
);
85 /* Find the disassembly address that corresponds to FROM lines above
86 or below the PC. Variable sized instructions are taken into
87 account by the algorithm. */
89 tui_find_disassembly_address (CORE_ADDR pc
, int from
)
94 struct tui_asm_line
*asm_lines
;
96 max_lines
= (from
> 0) ? from
: - from
;
100 asm_lines
= (struct tui_asm_line
*) alloca (sizeof (struct tui_asm_line
)
102 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
107 tui_disassemble (asm_lines
, pc
, max_lines
);
108 new_low
= asm_lines
[max_lines
- 1].addr
;
114 struct minimal_symbol
*msymbol
;
116 /* Find backward an address which is a symbol and for which
117 disassembling from that address will fill completely the
121 new_low
-= 1 * max_lines
;
122 msymbol
= lookup_minimal_symbol_by_pc_section (new_low
, 0);
125 new_low
= SYMBOL_VALUE_ADDRESS (msymbol
);
127 new_low
+= 1 * max_lines
;
129 tui_disassemble (asm_lines
, new_low
, max_lines
);
130 last_addr
= asm_lines
[pos
].addr
;
131 } while (last_addr
> pc
&& msymbol
);
133 /* Scan forward disassembling one instruction at a time until
134 the last visible instruction of the window matches the pc.
135 We keep the disassembled instructions in the 'lines' window
136 and shift it downward (increasing its addresses). */
143 if (pos
>= max_lines
)
146 next_addr
= tui_disassemble (&asm_lines
[pos
], last_addr
, 1);
148 /* If there are some problems while disassembling exit. */
149 if (next_addr
<= last_addr
)
151 last_addr
= next_addr
;
152 } while (last_addr
<= pc
);
154 if (pos
>= max_lines
)
156 new_low
= asm_lines
[pos
].addr
;
158 for (i
= 0; i
< max_lines
; i
++)
160 xfree (asm_lines
[i
].addr_string
);
161 xfree (asm_lines
[i
].insn
);
166 /* Function to set the disassembly window's content. */
168 tui_set_disassem_content (CORE_ADDR pc
)
170 enum tui_status ret
= TUI_FAILURE
;
172 int offset
= TUI_DISASM_WIN
->detail
.source_info
.horizontal_offset
;
173 int line_width
, max_lines
;
175 struct tui_gen_win_info
*locator
= tui_locator_win_info_ptr ();
176 int tab_len
= tui_default_tab_len ();
177 struct tui_asm_line
*asm_lines
;
179 int addr_size
, max_size
;
185 ret
= tui_alloc_source_buffer (TUI_DISASM_WIN
);
186 if (ret
!= TUI_SUCCESS
)
189 TUI_DISASM_WIN
->detail
.source_info
.start_line_or_addr
.loa
= LOA_ADDRESS
;
190 TUI_DISASM_WIN
->detail
.source_info
.start_line_or_addr
.u
.addr
= pc
;
192 (((struct tui_win_element
*) locator
->content
[0])->which_element
.locator
.addr
);
194 max_lines
= TUI_DISASM_WIN
->generic
.height
- 2; /* Account for
197 /* Get temporary table that will hold all strings (addr & insn). */
198 asm_lines
= (struct tui_asm_line
*) alloca (sizeof (struct tui_asm_line
)
200 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
202 line_width
= TUI_DISASM_WIN
->generic
.width
- 1;
204 tui_disassemble (asm_lines
, pc
, max_lines
);
206 /* See what is the maximum length of an address and of a line. */
209 for (i
= 0; i
< max_lines
; i
++)
211 size_t len
= strlen (asm_lines
[i
].addr_string
);
215 len
= strlen (asm_lines
[i
].insn
) + tab_len
;
219 max_size
+= addr_size
+ tab_len
;
221 /* Allocate memory to create each line. */
222 line
= (char*) alloca (max_size
);
223 insn_pos
= (1 + (addr_size
/ tab_len
)) * tab_len
;
225 /* Now construct each line. */
226 for (i
= 0; i
< max_lines
; i
++)
228 struct tui_win_element
*element
;
229 struct tui_source_element
*src
;
232 element
= (struct tui_win_element
*) TUI_DISASM_WIN
->generic
.content
[i
];
233 src
= &element
->which_element
.source
;
234 strcpy (line
, asm_lines
[i
].addr_string
);
235 cur_len
= strlen (line
);
237 /* Add spaces to make the instructions start on the same
239 while (cur_len
< insn_pos
)
245 strcat (line
, asm_lines
[i
].insn
);
247 /* Now copy the line taking the offset into account. */
248 if (strlen (line
) > offset
)
249 strcpy (src
->line
, &line
[offset
]);
253 src
->line_or_addr
.loa
= LOA_ADDRESS
;
254 src
->line_or_addr
.u
.addr
= asm_lines
[i
].addr
;
255 src
->is_exec_point
= asm_lines
[i
].addr
== cur_pc
;
257 /* See whether there is a breakpoint installed. */
258 src
->has_break
= (!src
->is_exec_point
259 && breakpoint_here_p (pc
) != no_breakpoint_here
);
261 xfree (asm_lines
[i
].addr_string
);
262 xfree (asm_lines
[i
].insn
);
264 TUI_DISASM_WIN
->generic
.content_size
= i
;
269 /* Function to display the disassembly window with disassembled code. */
271 tui_show_disassem (CORE_ADDR start_addr
)
273 struct symtab
*s
= find_pc_symtab (start_addr
);
274 struct tui_win_info
*win_with_focus
= tui_win_with_focus ();
275 struct tui_line_or_address val
;
277 val
.loa
= LOA_ADDRESS
;
278 val
.u
.addr
= start_addr
;
279 tui_add_win_to_layout (DISASSEM_WIN
);
280 tui_update_source_window (TUI_DISASM_WIN
, s
, val
, FALSE
);
282 /* If the focus was in the src win, put it in the asm win, if the
283 source view isn't split. */
284 if (tui_current_layout () != SRC_DISASSEM_COMMAND
285 && win_with_focus
== TUI_SRC_WIN
)
286 tui_set_win_focus_to (TUI_DISASM_WIN
);
292 /* Function to display the disassembly window. */
294 tui_show_disassem_and_update_source (CORE_ADDR start_addr
)
296 struct symtab_and_line sal
;
298 tui_show_disassem (start_addr
);
299 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
301 struct tui_line_or_address val
;
303 /* Update what is in the source window if it is displayed too,
304 note that it follows what is in the disassembly window and
306 sal
= find_pc_line (start_addr
, 0);
308 val
.u
.line_no
= sal
.line
;
309 tui_update_source_window (TUI_SRC_WIN
, sal
.symtab
, val
, TRUE
);
312 set_current_source_symtab_and_line (&sal
);
313 tui_update_locator_filename (sal
.symtab
->filename
);
316 tui_update_locator_filename ("?");
323 tui_get_begin_asm_address (void)
325 struct tui_gen_win_info
*locator
;
326 struct tui_locator_element
*element
;
329 locator
= tui_locator_win_info_ptr ();
330 element
= &((struct tui_win_element
*) locator
->content
[0])->which_element
.locator
;
332 if (element
->addr
== 0)
334 struct minimal_symbol
*main_symbol
;
336 /* Find address of the start of program.
337 Note: this should be language specific. */
338 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
339 if (main_symbol
== 0)
340 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
341 if (main_symbol
== 0)
342 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
344 addr
= SYMBOL_VALUE_ADDRESS (main_symbol
);
348 else /* The target is executing. */
349 addr
= element
->addr
;
354 /* Determine what the low address will be to display in the TUI's
355 disassembly window. This may or may not be the same as the low
358 tui_get_low_disassembly_address (CORE_ADDR low
,
363 /* Determine where to start the disassembly so that the pc is about
364 in the middle of the viewport. */
365 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
366 pc
= tui_find_disassembly_address (pc
, -pos
);
373 /* Scroll the disassembly forward or backward vertically. */
375 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction
,
378 if (TUI_DISASM_WIN
->generic
.content
!= NULL
)
381 tui_win_content content
;
382 struct tui_line_or_address val
;
385 content
= (tui_win_content
) TUI_DISASM_WIN
->generic
.content
;
387 pc
= content
[0]->which_element
.source
.line_or_addr
.u
.addr
;
389 dir
= (scroll_direction
== FORWARD_SCROLL
) ? num_to_scroll
: -num_to_scroll
;
391 val
.loa
= LOA_ADDRESS
;
392 val
.u
.addr
= tui_find_disassembly_address (pc
, dir
);
393 tui_update_source_window_as_is (TUI_DISASM_WIN
, NULL
, val
, FALSE
);