1 /* Disassembly display.
3 Copyright (C) 1998-2019 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 "tui/tui-source.h"
39 #include "progspace.h"
42 #include "gdb_curses.h"
51 /* Function to set the disassembly window's content.
52 Disassemble count lines starting at pc.
53 Return address of the count'th instruction after pc. */
55 tui_disassemble (struct gdbarch
*gdbarch
, struct tui_asm_line
*asm_lines
,
56 CORE_ADDR pc
, int count
)
58 string_file gdb_dis_out
;
60 /* Now construct each line. */
61 for (; count
> 0; count
--, asm_lines
++)
63 xfree (asm_lines
->addr_string
);
64 xfree (asm_lines
->insn
);
66 print_address (gdbarch
, pc
, &gdb_dis_out
);
68 asm_lines
->addr_string
= xstrdup (gdb_dis_out
.c_str ());
72 pc
= pc
+ gdb_print_insn (gdbarch
, pc
, &gdb_dis_out
, NULL
);
74 asm_lines
->insn
= xstrdup (gdb_dis_out
.c_str ());
76 /* Reset the buffer to empty. */
82 /* Find the disassembly address that corresponds to FROM lines above
83 or below the PC. Variable sized instructions are taken into
84 account by the algorithm. */
86 tui_find_disassembly_address (struct gdbarch
*gdbarch
, CORE_ADDR pc
, int from
)
91 struct tui_asm_line
*asm_lines
;
93 max_lines
= (from
> 0) ? from
: - from
;
97 asm_lines
= XALLOCAVEC (struct tui_asm_line
, max_lines
);
98 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
103 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
104 new_low
= asm_lines
[max_lines
- 1].addr
;
110 struct bound_minimal_symbol msymbol
;
112 /* Find backward an address which is a symbol and for which
113 disassembling from that address will fill completely the
117 new_low
-= 1 * max_lines
;
118 msymbol
= lookup_minimal_symbol_by_pc_section (new_low
, 0);
121 new_low
= BMSYMBOL_VALUE_ADDRESS (msymbol
);
123 new_low
+= 1 * max_lines
;
125 tui_disassemble (gdbarch
, asm_lines
, new_low
, max_lines
);
126 last_addr
= asm_lines
[pos
].addr
;
127 } while (last_addr
> pc
&& msymbol
.minsym
);
129 /* Scan forward disassembling one instruction at a time until
130 the last visible instruction of the window matches the pc.
131 We keep the disassembled instructions in the 'lines' window
132 and shift it downward (increasing its addresses). */
139 if (pos
>= max_lines
)
142 next_addr
= tui_disassemble (gdbarch
, &asm_lines
[pos
],
145 /* If there are some problems while disassembling exit. */
146 if (next_addr
<= last_addr
)
148 last_addr
= next_addr
;
149 } while (last_addr
<= pc
);
151 if (pos
>= max_lines
)
153 new_low
= asm_lines
[pos
].addr
;
155 for (i
= 0; i
< max_lines
; i
++)
157 xfree (asm_lines
[i
].addr_string
);
158 xfree (asm_lines
[i
].insn
);
163 /* Function to set the disassembly window's content. */
165 tui_disasm_window::set_contents (struct gdbarch
*arch
,
167 struct tui_line_or_address line_or_addr
)
170 int offset
= horizontal_offset
;
171 int max_lines
, line_width
;
173 struct tui_locator_window
*locator
= tui_locator_win_info_ptr ();
174 int tab_len
= tui_tab_width
;
175 struct tui_asm_line
*asm_lines
;
177 int addr_size
, insn_size
;
180 gdb_assert (line_or_addr
.loa
== LOA_ADDRESS
);
181 CORE_ADDR pc
= line_or_addr
.u
.addr
;
186 start_line_or_addr
.loa
= LOA_ADDRESS
;
187 start_line_or_addr
.u
.addr
= pc
;
188 cur_pc
= locator
->addr
;
190 /* Window size, excluding highlight box. */
191 max_lines
= height
- 2;
192 line_width
= width
- TUI_EXECINFO_SIZE
- 2;
194 /* Get temporary table that will hold all strings (addr & insn). */
195 asm_lines
= XALLOCAVEC (struct tui_asm_line
, max_lines
);
196 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
198 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
200 /* Determine maximum address- and instruction lengths. */
203 for (i
= 0; i
< max_lines
; i
++)
205 size_t len
= strlen (asm_lines
[i
].addr_string
);
210 len
= strlen (asm_lines
[i
].insn
);
215 /* Align instructions to the same column. */
216 insn_pos
= (1 + (addr_size
/ tab_len
)) * tab_len
;
218 /* Allocate memory to create each line. */
219 line
= (char*) alloca (insn_pos
+ insn_size
+ 1);
221 /* Now construct each line. */
222 content
.resize (max_lines
);
223 for (i
= 0; i
< max_lines
; i
++)
227 tui_source_element
*src
= &content
[i
];
228 strcpy (line
, asm_lines
[i
].addr_string
);
229 cur_len
= strlen (line
);
230 memset (line
+ cur_len
, ' ', insn_pos
- cur_len
);
231 strcpy (line
+ insn_pos
, asm_lines
[i
].insn
);
233 /* Now copy the line taking the offset into account. */
235 if (strlen (line
) > offset
)
236 src
->line
= xstrndup (&line
[offset
], line_width
);
238 src
->line
= xstrdup ("");
240 src
->line_or_addr
.loa
= LOA_ADDRESS
;
241 src
->line_or_addr
.u
.addr
= asm_lines
[i
].addr
;
242 src
->is_exec_point
= asm_lines
[i
].addr
== cur_pc
;
244 xfree (asm_lines
[i
].addr_string
);
245 xfree (asm_lines
[i
].insn
);
251 /* Function to display the disassembly window with disassembled code. */
253 tui_show_disassem (struct gdbarch
*gdbarch
, CORE_ADDR start_addr
)
255 struct symtab
*s
= find_pc_line_symtab (start_addr
);
256 struct tui_win_info
*win_with_focus
= tui_win_with_focus ();
257 struct tui_line_or_address val
;
259 gdb_assert (TUI_DISASM_WIN
!= nullptr && TUI_DISASM_WIN
->is_visible ());
261 val
.loa
= LOA_ADDRESS
;
262 val
.u
.addr
= start_addr
;
263 TUI_DISASM_WIN
->update_source_window (gdbarch
, s
, val
);
265 /* If the focus was in the src win, put it in the asm win, if the
266 source view isn't split. */
267 if (tui_current_layout () != SRC_DISASSEM_COMMAND
268 && win_with_focus
== TUI_SRC_WIN
)
269 tui_set_win_focus_to (TUI_DISASM_WIN
);
273 /* Function to display the disassembly window. */
275 tui_show_disassem_and_update_source (struct gdbarch
*gdbarch
,
276 CORE_ADDR start_addr
)
278 struct symtab_and_line sal
;
280 tui_show_disassem (gdbarch
, start_addr
);
281 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
283 struct tui_line_or_address val
;
285 /* Update what is in the source window if it is displayed too,
286 note that it follows what is in the disassembly window and
288 sal
= find_pc_line (start_addr
, 0);
290 val
.u
.line_no
= sal
.line
;
291 TUI_SRC_WIN
->update_source_window (gdbarch
, sal
.symtab
, val
);
294 set_current_source_symtab_and_line (sal
);
295 tui_update_locator_fullname (symtab_to_fullname (sal
.symtab
));
298 tui_update_locator_fullname ("?");
303 tui_get_begin_asm_address (struct gdbarch
**gdbarch_p
, CORE_ADDR
*addr_p
)
305 struct tui_locator_window
*locator
;
306 struct gdbarch
*gdbarch
= get_current_arch ();
309 locator
= tui_locator_win_info_ptr ();
311 if (locator
->addr
== 0)
313 struct bound_minimal_symbol main_symbol
;
315 /* Find address of the start of program.
316 Note: this should be language specific. */
317 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
318 if (main_symbol
.minsym
== 0)
319 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
320 if (main_symbol
.minsym
== 0)
321 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
322 if (main_symbol
.minsym
)
323 addr
= BMSYMBOL_VALUE_ADDRESS (main_symbol
);
327 else /* The target is executing. */
329 gdbarch
= locator
->gdbarch
;
330 addr
= locator
->addr
;
333 *gdbarch_p
= gdbarch
;
337 /* Determine what the low address will be to display in the TUI's
338 disassembly window. This may or may not be the same as the low
341 tui_get_low_disassembly_address (struct gdbarch
*gdbarch
,
342 CORE_ADDR low
, CORE_ADDR pc
)
346 /* Determine where to start the disassembly so that the pc is about
347 in the middle of the viewport. */
348 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
349 pc
= tui_find_disassembly_address (gdbarch
, pc
, -pos
);
356 /* Scroll the disassembly forward or backward vertically. */
358 tui_disasm_window::do_scroll_vertical (int num_to_scroll
)
360 if (!content
.empty ())
363 struct tui_line_or_address val
;
365 pc
= content
[0].line_or_addr
.u
.addr
;
366 if (num_to_scroll
>= 0)
371 val
.loa
= LOA_ADDRESS
;
372 val
.u
.addr
= tui_find_disassembly_address (gdbarch
, pc
, num_to_scroll
);
373 update_source_window_as_is (gdbarch
, NULL
, val
);
378 tui_disasm_window::location_matches_p (struct bp_location
*loc
, int line_no
)
380 return (content
[line_no
].line_or_addr
.loa
== LOA_ADDRESS
381 && content
[line_no
].line_or_addr
.u
.addr
== loc
->address
);
385 tui_disasm_window::addr_is_displayed (CORE_ADDR addr
) const
387 bool is_displayed
= false;
388 int threshold
= SCROLL_THRESHOLD
;
391 while (i
< content
.size () - threshold
&& !is_displayed
)
394 = (content
[i
].line_or_addr
.loa
== LOA_ADDRESS
395 && content
[i
].line_or_addr
.u
.addr
== addr
);
403 tui_disasm_window::maybe_update (struct frame_info
*fi
, symtab_and_line sal
,
404 int line_no
, CORE_ADDR addr
)
408 if (find_pc_partial_function (get_frame_pc (fi
),
409 NULL
, &low
, NULL
) == 0)
411 /* There is no symbol available for current PC. There is no
412 safe way how to "disassemble backwards". */
413 low
= get_frame_pc (fi
);
416 low
= tui_get_low_disassembly_address (get_frame_arch (fi
),
417 low
, get_frame_pc (fi
));
419 struct tui_line_or_address a
;
423 if (!addr_is_displayed (addr
))
424 update_source_window (get_frame_arch (fi
), sal
.symtab
, a
);
428 set_is_exec_point_at (a
);