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
= XALLOCAVEC (struct tui_asm_line
, max_lines
);
103 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
108 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
109 new_low
= asm_lines
[max_lines
- 1].addr
;
115 struct bound_minimal_symbol msymbol
;
117 /* Find backward an address which is a symbol and for which
118 disassembling from that address will fill completely the
122 new_low
-= 1 * max_lines
;
123 msymbol
= lookup_minimal_symbol_by_pc_section (new_low
, 0);
126 new_low
= BMSYMBOL_VALUE_ADDRESS (msymbol
);
128 new_low
+= 1 * max_lines
;
130 tui_disassemble (gdbarch
, asm_lines
, new_low
, max_lines
);
131 last_addr
= asm_lines
[pos
].addr
;
132 } while (last_addr
> pc
&& msymbol
.minsym
);
134 /* Scan forward disassembling one instruction at a time until
135 the last visible instruction of the window matches the pc.
136 We keep the disassembled instructions in the 'lines' window
137 and shift it downward (increasing its addresses). */
144 if (pos
>= max_lines
)
147 next_addr
= tui_disassemble (gdbarch
, &asm_lines
[pos
],
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 (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
172 enum tui_status ret
= TUI_FAILURE
;
174 int offset
= TUI_DISASM_WIN
->detail
.source_info
.horizontal_offset
;
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
.gdbarch
= gdbarch
;
192 TUI_DISASM_WIN
->detail
.source_info
.start_line_or_addr
.loa
= LOA_ADDRESS
;
193 TUI_DISASM_WIN
->detail
.source_info
.start_line_or_addr
.u
.addr
= pc
;
194 cur_pc
= locator
->content
[0]->which_element
.locator
.addr
;
196 max_lines
= TUI_DISASM_WIN
->generic
.height
- 2; /* Account for
199 /* Get temporary table that will hold all strings (addr & insn). */
200 asm_lines
= XALLOCAVEC (struct tui_asm_line
, max_lines
);
201 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
203 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
205 /* See what is the maximum length of an address and of a line. */
208 for (i
= 0; i
< max_lines
; i
++)
210 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
= 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 (current_program_space
->aspace
,
261 != no_breakpoint_here
);
263 xfree (asm_lines
[i
].addr_string
);
264 xfree (asm_lines
[i
].insn
);
266 TUI_DISASM_WIN
->generic
.content_size
= i
;
271 /* Function to display the disassembly window with disassembled code. */
273 tui_show_disassem (struct gdbarch
*gdbarch
, CORE_ADDR start_addr
)
275 struct symtab
*s
= find_pc_line_symtab (start_addr
);
276 struct tui_win_info
*win_with_focus
= tui_win_with_focus ();
277 struct tui_line_or_address val
;
279 val
.loa
= LOA_ADDRESS
;
280 val
.u
.addr
= start_addr
;
281 tui_add_win_to_layout (DISASSEM_WIN
);
282 tui_update_source_window (TUI_DISASM_WIN
, gdbarch
, s
, val
, FALSE
);
284 /* If the focus was in the src win, put it in the asm win, if the
285 source view isn't split. */
286 if (tui_current_layout () != SRC_DISASSEM_COMMAND
287 && win_with_focus
== TUI_SRC_WIN
)
288 tui_set_win_focus_to (TUI_DISASM_WIN
);
294 /* Function to display the disassembly window. */
296 tui_show_disassem_and_update_source (struct gdbarch
*gdbarch
,
297 CORE_ADDR start_addr
)
299 struct symtab_and_line sal
;
301 tui_show_disassem (gdbarch
, start_addr
);
302 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
304 struct tui_line_or_address val
;
306 /* Update what is in the source window if it is displayed too,
307 note that it follows what is in the disassembly window and
309 sal
= find_pc_line (start_addr
, 0);
311 val
.u
.line_no
= sal
.line
;
312 tui_update_source_window (TUI_SRC_WIN
, gdbarch
, sal
.symtab
, val
, TRUE
);
315 set_current_source_symtab_and_line (&sal
);
316 tui_update_locator_fullname (symtab_to_fullname (sal
.symtab
));
319 tui_update_locator_fullname ("?");
326 tui_get_begin_asm_address (struct gdbarch
**gdbarch_p
, CORE_ADDR
*addr_p
)
328 struct tui_gen_win_info
*locator
;
329 struct tui_locator_element
*element
;
330 struct gdbarch
*gdbarch
= get_current_arch ();
333 locator
= tui_locator_win_info_ptr ();
334 element
= &locator
->content
[0]->which_element
.locator
;
336 if (element
->addr
== 0)
338 struct bound_minimal_symbol main_symbol
;
340 /* Find address of the start of program.
341 Note: this should be language specific. */
342 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
343 if (main_symbol
.minsym
== 0)
344 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
345 if (main_symbol
.minsym
== 0)
346 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
347 if (main_symbol
.minsym
)
348 addr
= BMSYMBOL_VALUE_ADDRESS (main_symbol
);
352 else /* The target is executing. */
354 gdbarch
= element
->gdbarch
;
355 addr
= element
->addr
;
358 *gdbarch_p
= gdbarch
;
362 /* Determine what the low address will be to display in the TUI's
363 disassembly window. This may or may not be the same as the low
366 tui_get_low_disassembly_address (struct gdbarch
*gdbarch
,
367 CORE_ADDR low
, CORE_ADDR pc
)
371 /* Determine where to start the disassembly so that the pc is about
372 in the middle of the viewport. */
373 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
374 pc
= tui_find_disassembly_address (gdbarch
, pc
, -pos
);
381 /* Scroll the disassembly forward or backward vertically. */
383 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction
,
386 if (TUI_DISASM_WIN
->generic
.content
!= NULL
)
388 struct gdbarch
*gdbarch
= TUI_DISASM_WIN
->detail
.source_info
.gdbarch
;
390 tui_win_content content
;
391 struct tui_line_or_address val
;
394 content
= (tui_win_content
) TUI_DISASM_WIN
->generic
.content
;
396 pc
= content
[0]->which_element
.source
.line_or_addr
.u
.addr
;
398 dir
= (scroll_direction
== FORWARD_SCROLL
)
399 ? num_to_scroll
: -num_to_scroll
;
401 val
.loa
= LOA_ADDRESS
;
402 val
.u
.addr
= tui_find_disassembly_address (gdbarch
, pc
, dir
);
403 tui_update_source_window_as_is (TUI_DISASM_WIN
, gdbarch
,