1 /* Disassembly display.
3 Copyright (C) 1998-2015 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"
31 #include "tui/tui-data.h"
32 #include "tui/tui-win.h"
33 #include "tui/tui-layout.h"
34 #include "tui/tui-winsource.h"
35 #include "tui/tui-stack.h"
36 #include "tui/tui-file.h"
37 #include "tui/tui-disasm.h"
38 #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 bound_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
= BMSYMBOL_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
.minsym
);
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
= locator
->content
[0]->which_element
.locator
.addr
;
197 max_lines
= TUI_DISASM_WIN
->generic
.height
- 2; /* Account for
200 /* Get temporary table that will hold all strings (addr & insn). */
201 asm_lines
= (struct tui_asm_line
*) alloca (sizeof (struct tui_asm_line
)
203 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
205 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
207 /* See what is the maximum length of an address and of a line. */
210 for (i
= 0; i
< max_lines
; i
++)
212 size_t len
= strlen (asm_lines
[i
].addr_string
);
217 len
= strlen (asm_lines
[i
].insn
) + tab_len
;
221 max_size
+= addr_size
+ tab_len
;
223 /* Allocate memory to create each line. */
224 line
= (char*) alloca (max_size
);
225 insn_pos
= (1 + (addr_size
/ tab_len
)) * tab_len
;
227 /* Now construct each line. */
228 for (i
= 0; i
< max_lines
; i
++)
230 struct tui_win_element
*element
;
231 struct tui_source_element
*src
;
234 element
= TUI_DISASM_WIN
->generic
.content
[i
];
235 src
= &element
->which_element
.source
;
236 strcpy (line
, asm_lines
[i
].addr_string
);
237 cur_len
= strlen (line
);
239 /* Add spaces to make the instructions start on the same
241 while (cur_len
< insn_pos
)
247 strcat (line
, asm_lines
[i
].insn
);
249 /* Now copy the line taking the offset into account. */
250 if (strlen (line
) > offset
)
251 strcpy (src
->line
, &line
[offset
]);
255 src
->line_or_addr
.loa
= LOA_ADDRESS
;
256 src
->line_or_addr
.u
.addr
= asm_lines
[i
].addr
;
257 src
->is_exec_point
= asm_lines
[i
].addr
== cur_pc
;
259 /* See whether there is a breakpoint installed. */
260 src
->has_break
= (!src
->is_exec_point
261 && breakpoint_here_p (current_program_space
->aspace
,
263 != no_breakpoint_here
);
265 xfree (asm_lines
[i
].addr_string
);
266 xfree (asm_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 (struct gdbarch
*gdbarch
, CORE_ADDR start_addr
)
277 struct symtab
*s
= find_pc_line_symtab (start_addr
);
278 struct tui_win_info
*win_with_focus
= tui_win_with_focus ();
279 struct tui_line_or_address val
;
281 val
.loa
= LOA_ADDRESS
;
282 val
.u
.addr
= start_addr
;
283 tui_add_win_to_layout (DISASSEM_WIN
);
284 tui_update_source_window (TUI_DISASM_WIN
, gdbarch
, s
, val
, FALSE
);
286 /* If the focus was in the src win, put it in the asm win, if the
287 source view isn't split. */
288 if (tui_current_layout () != SRC_DISASSEM_COMMAND
289 && win_with_focus
== TUI_SRC_WIN
)
290 tui_set_win_focus_to (TUI_DISASM_WIN
);
296 /* Function to display the disassembly window. */
298 tui_show_disassem_and_update_source (struct gdbarch
*gdbarch
,
299 CORE_ADDR start_addr
)
301 struct symtab_and_line sal
;
303 tui_show_disassem (gdbarch
, start_addr
);
304 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
306 struct tui_line_or_address val
;
308 /* Update what is in the source window if it is displayed too,
309 note that it follows what is in the disassembly window and
311 sal
= find_pc_line (start_addr
, 0);
313 val
.u
.line_no
= sal
.line
;
314 tui_update_source_window (TUI_SRC_WIN
, gdbarch
, sal
.symtab
, val
, TRUE
);
317 set_current_source_symtab_and_line (&sal
);
318 tui_update_locator_fullname (symtab_to_fullname (sal
.symtab
));
321 tui_update_locator_fullname ("?");
328 tui_get_begin_asm_address (struct gdbarch
**gdbarch_p
, CORE_ADDR
*addr_p
)
330 struct tui_gen_win_info
*locator
;
331 struct tui_locator_element
*element
;
332 struct gdbarch
*gdbarch
= get_current_arch ();
335 locator
= tui_locator_win_info_ptr ();
336 element
= &locator
->content
[0]->which_element
.locator
;
338 if (element
->addr
== 0)
340 struct bound_minimal_symbol main_symbol
;
342 /* Find address of the start of program.
343 Note: this should be language specific. */
344 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
345 if (main_symbol
.minsym
== 0)
346 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
347 if (main_symbol
.minsym
== 0)
348 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
349 if (main_symbol
.minsym
)
350 addr
= BMSYMBOL_VALUE_ADDRESS (main_symbol
);
354 else /* The target is executing. */
356 gdbarch
= element
->gdbarch
;
357 addr
= element
->addr
;
360 *gdbarch_p
= gdbarch
;
364 /* Determine what the low address will be to display in the TUI's
365 disassembly window. This may or may not be the same as the low
368 tui_get_low_disassembly_address (struct gdbarch
*gdbarch
,
369 CORE_ADDR low
, CORE_ADDR pc
)
373 /* Determine where to start the disassembly so that the pc is about
374 in the middle of the viewport. */
375 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
376 pc
= tui_find_disassembly_address (gdbarch
, pc
, -pos
);
383 /* Scroll the disassembly forward or backward vertically. */
385 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction
,
388 if (TUI_DISASM_WIN
->generic
.content
!= NULL
)
390 struct gdbarch
*gdbarch
= TUI_DISASM_WIN
->detail
.source_info
.gdbarch
;
392 tui_win_content content
;
393 struct tui_line_or_address val
;
396 content
= (tui_win_content
) TUI_DISASM_WIN
->generic
.content
;
398 pc
= content
[0]->which_element
.source
.line_or_addr
.u
.addr
;
400 dir
= (scroll_direction
== FORWARD_SCROLL
)
401 ? num_to_scroll
: -num_to_scroll
;
403 val
.loa
= LOA_ADDRESS
;
404 val
.u
.addr
= tui_find_disassembly_address (gdbarch
, pc
, dir
);
405 tui_update_source_window_as_is (TUI_DISASM_WIN
, gdbarch
,