1 /* Disassembly display.
3 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
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 2 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, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
27 #include "breakpoint.h"
32 #include "gdb_string.h"
34 #include "tui/tui-data.h"
35 #include "tui/tui-win.h"
36 #include "tui/tui-layout.h"
37 #include "tui/tui-winsource.h"
38 #include "tui/tui-stack.h"
39 #include "tui/tui-file.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 tui_asm_line
* asm_lines
, CORE_ADDR pc
, int count
)
56 struct ui_file
*gdb_dis_out
;
58 /* now init the ui_file structure */
59 gdb_dis_out
= tui_sfileopen (256);
61 /* Now construct each line */
62 for (; count
> 0; count
--, asm_lines
++)
64 if (asm_lines
->addr_string
)
65 xfree (asm_lines
->addr_string
);
67 xfree (asm_lines
->insn
);
69 print_address (pc
, gdb_dis_out
);
71 asm_lines
->addr_string
= xstrdup (tui_file_get_strbuf (gdb_dis_out
));
73 ui_file_rewind (gdb_dis_out
);
75 pc
= pc
+ gdb_print_insn (pc
, gdb_dis_out
);
77 asm_lines
->insn
= xstrdup (tui_file_get_strbuf (gdb_dis_out
));
79 /* reset the buffer to empty */
80 ui_file_rewind (gdb_dis_out
);
82 ui_file_delete (gdb_dis_out
);
86 /* Find the disassembly address that corresponds to FROM lines
87 above or below the PC. Variable sized instructions are taken
88 into account by the algorithm. */
90 tui_find_disassembly_address (CORE_ADDR pc
, int from
)
95 struct tui_asm_line
* asm_lines
;
97 max_lines
= (from
> 0) ? from
: - from
;
101 asm_lines
= (struct tui_asm_line
*) alloca (sizeof (struct tui_asm_line
)
103 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
108 tui_disassemble (asm_lines
, pc
, max_lines
);
109 new_low
= asm_lines
[max_lines
- 1].addr
;
115 struct minimal_symbol
* msymbol
;
117 /* Find backward an address which is a symbol
118 and for which disassembling from that address will fill
119 completely the window. */
122 new_low
-= 1 * max_lines
;
123 msymbol
= lookup_minimal_symbol_by_pc_section (new_low
, 0);
126 new_low
= SYMBOL_VALUE_ADDRESS (msymbol
);
128 new_low
+= 1 * max_lines
;
130 tui_disassemble (asm_lines
, new_low
, max_lines
);
131 last_addr
= asm_lines
[pos
].addr
;
132 } while (last_addr
> pc
&& msymbol
);
134 /* Scan forward disassembling one instruction at a time
135 until the last visible instruction of the window
136 matches the pc. We keep the disassembled instructions
137 in the 'lines' window and shift it downward (increasing
145 if (pos
>= max_lines
)
148 next_addr
= tui_disassemble (&asm_lines
[pos
], last_addr
, 1);
150 /* If there are some problems while disassembling exit. */
151 if (next_addr
<= last_addr
)
153 last_addr
= next_addr
;
154 } while (last_addr
<= pc
);
156 if (pos
>= max_lines
)
158 new_low
= asm_lines
[pos
].addr
;
160 for (i
= 0; i
< max_lines
; i
++)
162 xfree (asm_lines
[i
].addr_string
);
163 xfree (asm_lines
[i
].insn
);
168 /* Function to set the disassembly window's content. */
170 tui_set_disassem_content (CORE_ADDR pc
)
172 enum tui_status ret
= TUI_FAILURE
;
174 int offset
= TUI_DISASM_WIN
->detail
.source_info
.horizontal_offset
;
175 int line_width
, max_lines
;
177 struct tui_gen_win_info
* locator
= tui_locator_win_info_ptr ();
178 int tab_len
= tui_default_tab_len ();
179 struct tui_asm_line
* asm_lines
;
181 int addr_size
, max_size
;
187 ret
= tui_alloc_source_buffer (TUI_DISASM_WIN
);
188 if (ret
!= TUI_SUCCESS
)
191 TUI_DISASM_WIN
->detail
.source_info
.start_line_or_addr
.addr
= pc
;
193 (((struct tui_win_element
*) locator
->content
[0])->which_element
.locator
.addr
);
195 max_lines
= TUI_DISASM_WIN
->generic
.height
- 2; /* account for hilite */
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 column */
238 while (cur_len
< insn_pos
)
244 strcat (line
, asm_lines
[i
].insn
);
246 /* Now copy the line taking the offset into account */
247 if (strlen (line
) > offset
)
248 strcpy (src
->line
, &line
[offset
]);
252 src
->line_or_addr
.addr
= asm_lines
[i
].addr
;
253 src
->is_exec_point
= asm_lines
[i
].addr
== cur_pc
;
255 /* See whether there is a breakpoint installed. */
256 src
->has_break
= (!src
->is_exec_point
257 && breakpoint_here_p (pc
) != no_breakpoint_here
);
259 xfree (asm_lines
[i
].addr_string
);
260 xfree (asm_lines
[i
].insn
);
262 TUI_DISASM_WIN
->generic
.content_size
= i
;
267 /* Function to display the disassembly window with disassembled code. */
269 tui_show_disassem (CORE_ADDR start_addr
)
271 struct symtab
*s
= find_pc_symtab (start_addr
);
272 struct tui_win_info
* win_with_focus
= tui_win_with_focus ();
273 union tui_line_or_address val
;
275 val
.addr
= start_addr
;
276 tui_add_win_to_layout (DISASSEM_WIN
);
277 tui_update_source_window (TUI_DISASM_WIN
, s
, val
, FALSE
);
279 ** if the focus was in the src win, put it in the asm win, if the
280 ** source view isn't split
282 if (tui_current_layout () != SRC_DISASSEM_COMMAND
&& win_with_focus
== TUI_SRC_WIN
)
283 tui_set_win_focus_to (TUI_DISASM_WIN
);
289 /* Function to display the disassembly window. */
291 tui_show_disassem_and_update_source (CORE_ADDR start_addr
)
293 struct symtab_and_line sal
;
295 tui_show_disassem (start_addr
);
296 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
298 union tui_line_or_address val
;
301 ** Update what is in the source window if it is displayed too,
302 ** note that it follows what is in the disassembly window and visa-versa
304 sal
= find_pc_line (start_addr
, 0);
305 val
.line_no
= sal
.line
;
306 tui_update_source_window (TUI_SRC_WIN
, sal
.symtab
, val
, TRUE
);
309 set_current_source_symtab_and_line (&sal
);
310 tui_update_locator_filename (sal
.symtab
->filename
);
313 tui_update_locator_filename ("?");
320 tui_get_begin_asm_address (void)
322 struct tui_gen_win_info
* locator
;
323 struct tui_locator_element
* element
;
326 locator
= tui_locator_win_info_ptr ();
327 element
= &((struct tui_win_element
*) locator
->content
[0])->which_element
.locator
;
329 if (element
->addr
== 0)
331 struct minimal_symbol
*main_symbol
;
333 /* Find address of the start of program.
334 Note: this should be language specific. */
335 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
336 if (main_symbol
== 0)
337 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
338 if (main_symbol
== 0)
339 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
341 addr
= SYMBOL_VALUE_ADDRESS (main_symbol
);
345 else /* the target is executing */
346 addr
= element
->addr
;
351 /* Determine what the low address will be to display in the TUI's
352 disassembly window. This may or may not be the same as the
353 low address input. */
355 tui_get_low_disassembly_address (CORE_ADDR low
, CORE_ADDR pc
)
359 /* Determine where to start the disassembly so that the pc is about in the
360 middle of the viewport. */
361 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
362 pc
= tui_find_disassembly_address (pc
, -pos
);
369 /* Scroll the disassembly forward or backward vertically. */
371 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction
,
374 if (TUI_DISASM_WIN
->generic
.content
!= NULL
)
377 tui_win_content content
;
379 union tui_line_or_address val
;
381 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
383 content
= (tui_win_content
) TUI_DISASM_WIN
->generic
.content
;
384 if (cursal
.symtab
== (struct symtab
*) NULL
)
385 s
= find_pc_symtab (get_frame_pc (deprecated_selected_frame
));
389 /* account for hilite */
390 max_lines
= TUI_DISASM_WIN
->generic
.height
- 2;
391 pc
= content
[0]->which_element
.source
.line_or_addr
.addr
;
392 dir
= (scroll_direction
== FORWARD_SCROLL
) ? max_lines
: - max_lines
;
394 val
.addr
= tui_find_disassembly_address (pc
, dir
);
395 tui_update_source_window_as_is (TUI_DISASM_WIN
, s
, val
, FALSE
);