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"
56 /* Function to set the disassembly window's content.
57 Disassemble count lines starting at pc.
58 Return address of the count'th instruction after pc. */
60 tui_disassemble (struct tui_asm_line
* lines
, CORE_ADDR pc
, int count
)
62 struct ui_file
*gdb_dis_out
;
64 /* now init the ui_file structure */
65 gdb_dis_out
= tui_sfileopen (256);
67 /* Now construct each line */
68 for (; count
> 0; count
--, lines
++)
70 if (lines
->addr_string
)
71 xfree (lines
->addr_string
);
75 print_address (pc
, gdb_dis_out
);
77 lines
->addr_string
= xstrdup (tui_file_get_strbuf (gdb_dis_out
));
79 ui_file_rewind (gdb_dis_out
);
81 pc
= pc
+ gdb_print_insn (pc
, gdb_dis_out
);
83 lines
->insn
= xstrdup (tui_file_get_strbuf (gdb_dis_out
));
85 /* reset the buffer to empty */
86 ui_file_rewind (gdb_dis_out
);
88 ui_file_delete (gdb_dis_out
);
92 /* Find the disassembly address that corresponds to FROM lines
93 above or below the PC. Variable sized instructions are taken
94 into account by the algorithm. */
96 tui_find_disassembly_address (CORE_ADDR pc
, int from
)
101 struct tui_asm_line
* lines
;
103 max_lines
= (from
> 0) ? from
: - from
;
107 lines
= (struct tui_asm_line
*) alloca (sizeof (struct tui_asm_line
)
109 memset (lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
114 tui_disassemble (lines
, pc
, max_lines
);
115 new_low
= lines
[max_lines
- 1].addr
;
121 struct minimal_symbol
* msymbol
;
123 /* Find backward an address which is a symbol
124 and for which disassembling from that address will fill
125 completely the window. */
128 new_low
-= 1 * max_lines
;
129 msymbol
= lookup_minimal_symbol_by_pc_section (new_low
, 0);
132 new_low
= SYMBOL_VALUE_ADDRESS (msymbol
);
134 new_low
+= 1 * max_lines
;
136 tui_disassemble (lines
, new_low
, max_lines
);
137 last_addr
= lines
[pos
].addr
;
138 } while (last_addr
> pc
&& msymbol
);
140 /* Scan forward disassembling one instruction at a time
141 until the last visible instruction of the window
142 matches the pc. We keep the disassembled instructions
143 in the 'lines' window and shift it downward (increasing
151 if (pos
>= max_lines
)
154 next_addr
= tui_disassemble (&lines
[pos
], last_addr
, 1);
156 /* If there are some problems while disassembling exit. */
157 if (next_addr
<= last_addr
)
159 last_addr
= next_addr
;
160 } while (last_addr
<= pc
);
162 if (pos
>= max_lines
)
164 new_low
= lines
[pos
].addr
;
166 for (i
= 0; i
< max_lines
; i
++)
168 xfree (lines
[i
].addr_string
);
169 xfree (lines
[i
].insn
);
174 /* Function to set the disassembly window's content. */
176 tui_set_disassem_content (CORE_ADDR pc
)
178 enum tui_status ret
= TUI_FAILURE
;
180 int offset
= TUI_DISASM_WIN
->detail
.source_info
.horizontal_offset
;
181 int line_width
, max_lines
;
183 struct tui_gen_win_info
* locator
= tui_locator_win_info_ptr ();
184 int tab_len
= tui_default_tab_len ();
185 struct tui_asm_line
* lines
;
187 int addr_size
, max_size
;
193 ret
= tui_alloc_source_buffer (TUI_DISASM_WIN
);
194 if (ret
!= TUI_SUCCESS
)
197 TUI_DISASM_WIN
->detail
.source_info
.start_line_or_addr
.addr
= pc
;
199 (((struct tui_win_element
*) locator
->content
[0])->which_element
.locator
.addr
);
201 max_lines
= TUI_DISASM_WIN
->generic
.height
- 2; /* account for hilite */
203 /* Get temporary table that will hold all strings (addr & insn). */
204 lines
= (struct tui_asm_line
*) alloca (sizeof (struct tui_asm_line
)
206 memset (lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
208 line_width
= TUI_DISASM_WIN
->generic
.width
- 1;
210 tui_disassemble (lines
, pc
, max_lines
);
212 /* See what is the maximum length of an address and of a line. */
215 for (i
= 0; i
< max_lines
; i
++)
217 size_t len
= strlen (lines
[i
].addr_string
);
221 len
= strlen (lines
[i
].insn
) + tab_len
;
225 max_size
+= addr_size
+ tab_len
;
227 /* Allocate memory to create each line. */
228 line
= (char*) alloca (max_size
);
229 insn_pos
= (1 + (addr_size
/ tab_len
)) * tab_len
;
231 /* Now construct each line */
232 for (i
= 0; i
< max_lines
; i
++)
234 struct tui_win_element
* element
;
235 struct tui_source_element
* src
;
238 element
= (struct tui_win_element
*) TUI_DISASM_WIN
->generic
.content
[i
];
239 src
= &element
->which_element
.source
;
240 strcpy (line
, lines
[i
].addr_string
);
241 cur_len
= strlen (line
);
243 /* Add spaces to make the instructions start on the same column */
244 while (cur_len
< insn_pos
)
250 strcat (line
, 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
.addr
= lines
[i
].addr
;
259 src
->is_exec_point
= 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 (pc
) != no_breakpoint_here
);
265 xfree (lines
[i
].addr_string
);
266 xfree (lines
[i
].insn
);
268 TUI_DISASM_WIN
->generic
.content_size
= i
;
273 /* Function to display the disassembly window with disassembled code. */
275 tui_show_disassem (CORE_ADDR start_addr
)
277 struct symtab
*s
= find_pc_symtab (start_addr
);
278 struct tui_win_info
* win_with_focus
= tui_win_with_focus ();
279 union tui_line_or_address val
;
281 val
.addr
= start_addr
;
282 tui_add_win_to_layout (DISASSEM_WIN
);
283 tui_update_source_window (TUI_DISASM_WIN
, s
, val
, FALSE
);
285 ** if the focus was in the src win, put it in the asm win, if the
286 ** source view isn't split
288 if (tui_current_layout () != SRC_DISASSEM_COMMAND
&& win_with_focus
== TUI_SRC_WIN
)
289 tui_set_win_focus_to (TUI_DISASM_WIN
);
295 /* Function to display the disassembly window. */
297 tui_show_disassem_and_update_source (CORE_ADDR start_addr
)
299 struct symtab_and_line sal
;
301 tui_show_disassem (start_addr
);
302 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
304 union tui_line_or_address val
;
307 ** Update what is in the source window if it is displayed too,
308 ** note that it follows what is in the disassembly window and visa-versa
310 sal
= find_pc_line (start_addr
, 0);
311 val
.line_no
= sal
.line
;
312 tui_update_source_window (TUI_SRC_WIN
, sal
.symtab
, val
, TRUE
);
315 set_current_source_symtab_and_line (&sal
);
316 tui_update_locator_filename (sal
.symtab
->filename
);
319 tui_update_locator_filename ("?");
326 tui_get_begin_asm_address (void)
328 struct tui_gen_win_info
* locator
;
329 struct tui_locator_element
* element
;
332 locator
= tui_locator_win_info_ptr ();
333 element
= &((struct tui_win_element
*) locator
->content
[0])->which_element
.locator
;
335 if (element
->addr
== 0)
337 struct minimal_symbol
*main_symbol
;
339 /* Find address of the start of program.
340 Note: this should be language specific. */
341 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
342 if (main_symbol
== 0)
343 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
344 if (main_symbol
== 0)
345 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
347 addr
= SYMBOL_VALUE_ADDRESS (main_symbol
);
351 else /* the target is executing */
352 addr
= element
->addr
;
357 /* Determine what the low address will be to display in the TUI's
358 disassembly window. This may or may not be the same as the
359 low address input. */
361 tui_get_low_disassembly_address (CORE_ADDR low
, CORE_ADDR pc
)
365 /* Determine where to start the disassembly so that the pc is about in the
366 middle of the viewport. */
367 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
368 pc
= tui_find_disassembly_address (pc
, -pos
);
375 /* Scroll the disassembly forward or backward vertically. */
377 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction
,
380 if (TUI_DISASM_WIN
->generic
.content
!= NULL
)
383 tui_win_content content
;
385 union tui_line_or_address val
;
387 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
389 content
= (tui_win_content
) TUI_DISASM_WIN
->generic
.content
;
390 if (cursal
.symtab
== (struct symtab
*) NULL
)
391 s
= find_pc_symtab (get_frame_pc (deprecated_selected_frame
));
395 /* account for hilite */
396 max_lines
= TUI_DISASM_WIN
->generic
.height
- 2;
397 pc
= content
[0]->which_element
.source
.line_or_addr
.addr
;
398 dir
= (scroll_direction
== FORWARD_SCROLL
) ? max_lines
: - max_lines
;
400 val
.addr
= tui_find_disassembly_address (pc
, dir
);
401 tui_update_source_window_as_is (TUI_DISASM_WIN
, s
, val
, FALSE
);