1 /* Disassembly display.
3 Copyright (C) 1998-2013 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"
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"
38 #include "tui/tui-disasm.h"
39 #include "progspace.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 gdbarch
*gdbarch
, struct tui_asm_line
*asm_lines
,
55 CORE_ADDR pc
, int count
)
57 struct ui_file
*gdb_dis_out
;
59 /* Now init the ui_file structure. */
60 gdb_dis_out
= tui_sfileopen (256);
62 /* Now construct each line. */
63 for (; count
> 0; count
--, asm_lines
++)
65 if (asm_lines
->addr_string
)
66 xfree (asm_lines
->addr_string
);
68 xfree (asm_lines
->insn
);
70 print_address (gdbarch
, pc
, gdb_dis_out
);
72 asm_lines
->addr_string
= xstrdup (tui_file_get_strbuf (gdb_dis_out
));
74 ui_file_rewind (gdb_dis_out
);
76 pc
= pc
+ gdb_print_insn (gdbarch
, pc
, gdb_dis_out
, NULL
);
78 asm_lines
->insn
= xstrdup (tui_file_get_strbuf (gdb_dis_out
));
80 /* Reset the buffer to empty. */
81 ui_file_rewind (gdb_dis_out
);
83 ui_file_delete (gdb_dis_out
);
87 /* Find the disassembly address that corresponds to FROM lines above
88 or below the PC. Variable sized instructions are taken into
89 account by the algorithm. */
91 tui_find_disassembly_address (struct gdbarch
*gdbarch
, CORE_ADDR pc
, int from
)
96 struct tui_asm_line
*asm_lines
;
98 max_lines
= (from
> 0) ? from
: - from
;
102 asm_lines
= (struct tui_asm_line
*) alloca (sizeof (struct tui_asm_line
)
104 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
109 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
110 new_low
= asm_lines
[max_lines
- 1].addr
;
116 struct minimal_symbol
*msymbol
;
118 /* Find backward an address which is a symbol and for which
119 disassembling from that address will fill completely the
123 new_low
-= 1 * max_lines
;
124 msymbol
= lookup_minimal_symbol_by_pc_section (new_low
, 0);
127 new_low
= SYMBOL_VALUE_ADDRESS (msymbol
);
129 new_low
+= 1 * max_lines
;
131 tui_disassemble (gdbarch
, asm_lines
, new_low
, max_lines
);
132 last_addr
= asm_lines
[pos
].addr
;
133 } while (last_addr
> pc
&& msymbol
);
135 /* Scan forward disassembling one instruction at a time until
136 the last visible instruction of the window matches the pc.
137 We keep the disassembled instructions in the 'lines' window
138 and shift it downward (increasing its addresses). */
145 if (pos
>= max_lines
)
148 next_addr
= tui_disassemble (gdbarch
, &asm_lines
[pos
],
151 /* If there are some problems while disassembling exit. */
152 if (next_addr
<= last_addr
)
154 last_addr
= next_addr
;
155 } while (last_addr
<= pc
);
157 if (pos
>= max_lines
)
159 new_low
= asm_lines
[pos
].addr
;
161 for (i
= 0; i
< max_lines
; i
++)
163 xfree (asm_lines
[i
].addr_string
);
164 xfree (asm_lines
[i
].insn
);
169 /* Function to set the disassembly window's content. */
171 tui_set_disassem_content (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
173 enum tui_status ret
= TUI_FAILURE
;
175 int offset
= TUI_DISASM_WIN
->detail
.source_info
.horizontal_offset
;
178 struct tui_gen_win_info
*locator
= tui_locator_win_info_ptr ();
179 int tab_len
= tui_default_tab_len ();
180 struct tui_asm_line
*asm_lines
;
182 int addr_size
, max_size
;
188 ret
= tui_alloc_source_buffer (TUI_DISASM_WIN
);
189 if (ret
!= TUI_SUCCESS
)
192 TUI_DISASM_WIN
->detail
.source_info
.gdbarch
= gdbarch
;
193 TUI_DISASM_WIN
->detail
.source_info
.start_line_or_addr
.loa
= LOA_ADDRESS
;
194 TUI_DISASM_WIN
->detail
.source_info
.start_line_or_addr
.u
.addr
= pc
;
195 cur_pc
= (CORE_ADDR
) (((struct tui_win_element
*)
196 locator
->content
[0])->which_element
.locator
.addr
);
198 max_lines
= TUI_DISASM_WIN
->generic
.height
- 2; /* Account for
201 /* Get temporary table that will hold all strings (addr & insn). */
202 asm_lines
= (struct tui_asm_line
*) alloca (sizeof (struct tui_asm_line
)
204 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
206 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
208 /* See what is the maximum length of an address and of a line. */
211 for (i
= 0; i
< max_lines
; i
++)
213 size_t len
= strlen (asm_lines
[i
].addr_string
);
218 len
= strlen (asm_lines
[i
].insn
) + tab_len
;
222 max_size
+= addr_size
+ tab_len
;
224 /* Allocate memory to create each line. */
225 line
= (char*) alloca (max_size
);
226 insn_pos
= (1 + (addr_size
/ tab_len
)) * tab_len
;
228 /* Now construct each line. */
229 for (i
= 0; i
< max_lines
; i
++)
231 struct tui_win_element
*element
;
232 struct tui_source_element
*src
;
235 element
= (struct tui_win_element
*) TUI_DISASM_WIN
->generic
.content
[i
];
236 src
= &element
->which_element
.source
;
237 strcpy (line
, asm_lines
[i
].addr_string
);
238 cur_len
= strlen (line
);
240 /* Add spaces to make the instructions start on the same
242 while (cur_len
< insn_pos
)
248 strcat (line
, asm_lines
[i
].insn
);
250 /* Now copy the line taking the offset into account. */
251 if (strlen (line
) > offset
)
252 strcpy (src
->line
, &line
[offset
]);
256 src
->line_or_addr
.loa
= LOA_ADDRESS
;
257 src
->line_or_addr
.u
.addr
= asm_lines
[i
].addr
;
258 src
->is_exec_point
= asm_lines
[i
].addr
== cur_pc
;
260 /* See whether there is a breakpoint installed. */
261 src
->has_break
= (!src
->is_exec_point
262 && breakpoint_here_p (current_program_space
->aspace
,
264 != no_breakpoint_here
);
266 xfree (asm_lines
[i
].addr_string
);
267 xfree (asm_lines
[i
].insn
);
269 TUI_DISASM_WIN
->generic
.content_size
= i
;
274 /* Function to display the disassembly window with disassembled code. */
276 tui_show_disassem (struct gdbarch
*gdbarch
, CORE_ADDR start_addr
)
278 struct symtab
*s
= find_pc_symtab (start_addr
);
279 struct tui_win_info
*win_with_focus
= tui_win_with_focus ();
280 struct tui_line_or_address val
;
282 val
.loa
= LOA_ADDRESS
;
283 val
.u
.addr
= start_addr
;
284 tui_add_win_to_layout (DISASSEM_WIN
);
285 tui_update_source_window (TUI_DISASM_WIN
, gdbarch
, s
, val
, FALSE
);
287 /* If the focus was in the src win, put it in the asm win, if the
288 source view isn't split. */
289 if (tui_current_layout () != SRC_DISASSEM_COMMAND
290 && win_with_focus
== TUI_SRC_WIN
)
291 tui_set_win_focus_to (TUI_DISASM_WIN
);
297 /* Function to display the disassembly window. */
299 tui_show_disassem_and_update_source (struct gdbarch
*gdbarch
,
300 CORE_ADDR start_addr
)
302 struct symtab_and_line sal
;
304 tui_show_disassem (gdbarch
, start_addr
);
305 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
307 struct tui_line_or_address val
;
309 /* Update what is in the source window if it is displayed too,
310 note that it follows what is in the disassembly window and
312 sal
= find_pc_line (start_addr
, 0);
314 val
.u
.line_no
= sal
.line
;
315 tui_update_source_window (TUI_SRC_WIN
, gdbarch
, sal
.symtab
, val
, TRUE
);
318 set_current_source_symtab_and_line (&sal
);
319 tui_update_locator_fullname (symtab_to_fullname (sal
.symtab
));
322 tui_update_locator_fullname ("?");
329 tui_get_begin_asm_address (struct gdbarch
**gdbarch_p
, CORE_ADDR
*addr_p
)
331 struct tui_gen_win_info
*locator
;
332 struct tui_locator_element
*element
;
333 struct gdbarch
*gdbarch
= get_current_arch ();
336 locator
= tui_locator_win_info_ptr ();
337 element
= &((struct tui_win_element
*)
338 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
)
403 ? num_to_scroll
: -num_to_scroll
;
405 val
.loa
= LOA_ADDRESS
;
406 val
.u
.addr
= tui_find_disassembly_address (gdbarch
, pc
, dir
);
407 tui_update_source_window_as_is (TUI_DISASM_WIN
, gdbarch
,