1 /* Disassembly display.
3 Copyright (C) 1998-2016 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
;
175 int max_lines
, line_width
;
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
, insn_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 /* Window size, excluding highlight box. */
197 max_lines
= TUI_DISASM_WIN
->generic
.height
- 2;
198 line_width
= TUI_DISASM_WIN
->generic
.width
- 2;
200 /* Get temporary table that will hold all strings (addr & insn). */
201 asm_lines
= XALLOCAVEC (struct tui_asm_line
, max_lines
);
202 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
204 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
206 /* Determine maximum address- and instruction lengths. */
209 for (i
= 0; i
< max_lines
; i
++)
211 size_t len
= strlen (asm_lines
[i
].addr_string
);
216 len
= strlen (asm_lines
[i
].insn
);
221 /* Align instructions to the same column. */
222 insn_pos
= (1 + (addr_size
/ tab_len
)) * tab_len
;
224 /* Allocate memory to create each line. */
225 line
= (char*) alloca (insn_pos
+ insn_size
+ 1);
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
);
238 memset (line
+ cur_len
, ' ', insn_pos
- cur_len
);
239 strcpy (line
+ insn_pos
, asm_lines
[i
].insn
);
241 /* Now copy the line taking the offset into account. */
242 if (strlen (line
) > offset
)
244 strncpy (src
->line
, &line
[offset
], line_width
);
245 src
->line
[line_width
] = '\0';
250 src
->line_or_addr
.loa
= LOA_ADDRESS
;
251 src
->line_or_addr
.u
.addr
= asm_lines
[i
].addr
;
252 src
->is_exec_point
= asm_lines
[i
].addr
== cur_pc
;
254 /* See whether there is a breakpoint installed. */
255 src
->has_break
= (!src
->is_exec_point
256 && breakpoint_here_p (current_program_space
->aspace
,
258 != no_breakpoint_here
);
260 xfree (asm_lines
[i
].addr_string
);
261 xfree (asm_lines
[i
].insn
);
263 TUI_DISASM_WIN
->generic
.content_size
= i
;
268 /* Function to display the disassembly window with disassembled code. */
270 tui_show_disassem (struct gdbarch
*gdbarch
, CORE_ADDR start_addr
)
272 struct symtab
*s
= find_pc_line_symtab (start_addr
);
273 struct tui_win_info
*win_with_focus
= tui_win_with_focus ();
274 struct tui_line_or_address val
;
276 val
.loa
= LOA_ADDRESS
;
277 val
.u
.addr
= start_addr
;
278 tui_add_win_to_layout (DISASSEM_WIN
);
279 tui_update_source_window (TUI_DISASM_WIN
, gdbarch
, s
, val
, FALSE
);
281 /* If the focus was in the src win, put it in the asm win, if the
282 source view isn't split. */
283 if (tui_current_layout () != SRC_DISASSEM_COMMAND
284 && win_with_focus
== TUI_SRC_WIN
)
285 tui_set_win_focus_to (TUI_DISASM_WIN
);
291 /* Function to display the disassembly window. */
293 tui_show_disassem_and_update_source (struct gdbarch
*gdbarch
,
294 CORE_ADDR start_addr
)
296 struct symtab_and_line sal
;
298 tui_show_disassem (gdbarch
, start_addr
);
299 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
301 struct tui_line_or_address val
;
303 /* Update what is in the source window if it is displayed too,
304 note that it follows what is in the disassembly window and
306 sal
= find_pc_line (start_addr
, 0);
308 val
.u
.line_no
= sal
.line
;
309 tui_update_source_window (TUI_SRC_WIN
, gdbarch
, sal
.symtab
, val
, TRUE
);
312 set_current_source_symtab_and_line (&sal
);
313 tui_update_locator_fullname (symtab_to_fullname (sal
.symtab
));
316 tui_update_locator_fullname ("?");
323 tui_get_begin_asm_address (struct gdbarch
**gdbarch_p
, CORE_ADDR
*addr_p
)
325 struct tui_gen_win_info
*locator
;
326 struct tui_locator_element
*element
;
327 struct gdbarch
*gdbarch
= get_current_arch ();
330 locator
= tui_locator_win_info_ptr ();
331 element
= &locator
->content
[0]->which_element
.locator
;
333 if (element
->addr
== 0)
335 struct bound_minimal_symbol main_symbol
;
337 /* Find address of the start of program.
338 Note: this should be language specific. */
339 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
340 if (main_symbol
.minsym
== 0)
341 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
342 if (main_symbol
.minsym
== 0)
343 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
344 if (main_symbol
.minsym
)
345 addr
= BMSYMBOL_VALUE_ADDRESS (main_symbol
);
349 else /* The target is executing. */
351 gdbarch
= element
->gdbarch
;
352 addr
= element
->addr
;
355 *gdbarch_p
= gdbarch
;
359 /* Determine what the low address will be to display in the TUI's
360 disassembly window. This may or may not be the same as the low
363 tui_get_low_disassembly_address (struct gdbarch
*gdbarch
,
364 CORE_ADDR low
, CORE_ADDR pc
)
368 /* Determine where to start the disassembly so that the pc is about
369 in the middle of the viewport. */
370 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
371 pc
= tui_find_disassembly_address (gdbarch
, pc
, -pos
);
378 /* Scroll the disassembly forward or backward vertically. */
380 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction
,
383 if (TUI_DISASM_WIN
->generic
.content
!= NULL
)
385 struct gdbarch
*gdbarch
= TUI_DISASM_WIN
->detail
.source_info
.gdbarch
;
387 tui_win_content content
;
388 struct tui_line_or_address val
;
391 content
= (tui_win_content
) TUI_DISASM_WIN
->generic
.content
;
393 pc
= content
[0]->which_element
.source
.line_or_addr
.u
.addr
;
395 dir
= (scroll_direction
== FORWARD_SCROLL
)
396 ? num_to_scroll
: -num_to_scroll
;
398 val
.loa
= LOA_ADDRESS
;
399 val
.u
.addr
= tui_find_disassembly_address (gdbarch
, pc
, dir
);
400 tui_update_source_window_as_is (TUI_DISASM_WIN
, gdbarch
,