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_set_disassem_content (tui_source_window_base
*win_info
,
166 struct gdbarch
*gdbarch
, CORE_ADDR pc
)
169 int offset
= win_info
->horizontal_offset
;
170 int max_lines
, line_width
;
172 struct tui_locator_window
*locator
= tui_locator_win_info_ptr ();
173 int tab_len
= tui_tab_width
;
174 struct tui_asm_line
*asm_lines
;
176 int addr_size
, insn_size
;
182 tui_alloc_source_buffer (win_info
);
184 win_info
->gdbarch
= gdbarch
;
185 win_info
->start_line_or_addr
.loa
= LOA_ADDRESS
;
186 win_info
->start_line_or_addr
.u
.addr
= pc
;
187 cur_pc
= locator
->addr
;
189 /* Window size, excluding highlight box. */
190 max_lines
= win_info
->height
- 2;
191 line_width
= win_info
->width
- 2;
193 /* Get temporary table that will hold all strings (addr & insn). */
194 asm_lines
= XALLOCAVEC (struct tui_asm_line
, max_lines
);
195 memset (asm_lines
, 0, sizeof (struct tui_asm_line
) * max_lines
);
197 tui_disassemble (gdbarch
, asm_lines
, pc
, max_lines
);
199 /* Determine maximum address- and instruction lengths. */
202 for (i
= 0; i
< max_lines
; i
++)
204 size_t len
= strlen (asm_lines
[i
].addr_string
);
209 len
= strlen (asm_lines
[i
].insn
);
214 /* Align instructions to the same column. */
215 insn_pos
= (1 + (addr_size
/ tab_len
)) * tab_len
;
217 /* Allocate memory to create each line. */
218 line
= (char*) alloca (insn_pos
+ insn_size
+ 1);
220 /* Now construct each line. */
221 win_info
->content
.resize (max_lines
);
222 for (i
= 0; i
< max_lines
; i
++)
226 tui_source_element
*src
= &win_info
->content
[i
];
227 strcpy (line
, asm_lines
[i
].addr_string
);
228 cur_len
= strlen (line
);
229 memset (line
+ cur_len
, ' ', insn_pos
- cur_len
);
230 strcpy (line
+ insn_pos
, asm_lines
[i
].insn
);
232 /* Now copy the line taking the offset into account. */
234 if (strlen (line
) > offset
)
235 src
->line
= xstrndup (&line
[offset
], line_width
);
237 src
->line
= xstrdup ("");
239 src
->line_or_addr
.loa
= LOA_ADDRESS
;
240 src
->line_or_addr
.u
.addr
= asm_lines
[i
].addr
;
241 src
->is_exec_point
= asm_lines
[i
].addr
== cur_pc
;
243 xfree (asm_lines
[i
].addr_string
);
244 xfree (asm_lines
[i
].insn
);
250 /* Function to display the disassembly window with disassembled code. */
252 tui_show_disassem (struct gdbarch
*gdbarch
, CORE_ADDR start_addr
)
254 struct symtab
*s
= find_pc_line_symtab (start_addr
);
255 struct tui_win_info
*win_with_focus
= tui_win_with_focus ();
256 struct tui_line_or_address val
;
258 gdb_assert (TUI_DISASM_WIN
!= nullptr && TUI_DISASM_WIN
->is_visible
);
260 val
.loa
= LOA_ADDRESS
;
261 val
.u
.addr
= start_addr
;
262 tui_update_source_window (TUI_DISASM_WIN
, gdbarch
, s
, val
, FALSE
);
264 /* If the focus was in the src win, put it in the asm win, if the
265 source view isn't split. */
266 if (tui_current_layout () != SRC_DISASSEM_COMMAND
267 && win_with_focus
== TUI_SRC_WIN
)
268 tui_set_win_focus_to (TUI_DISASM_WIN
);
272 /* Function to display the disassembly window. */
274 tui_show_disassem_and_update_source (struct gdbarch
*gdbarch
,
275 CORE_ADDR start_addr
)
277 struct symtab_and_line sal
;
279 tui_show_disassem (gdbarch
, start_addr
);
280 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
282 struct tui_line_or_address val
;
284 /* Update what is in the source window if it is displayed too,
285 note that it follows what is in the disassembly window and
287 sal
= find_pc_line (start_addr
, 0);
289 val
.u
.line_no
= sal
.line
;
290 tui_update_source_window (TUI_SRC_WIN
, gdbarch
, sal
.symtab
, val
, TRUE
);
293 set_current_source_symtab_and_line (sal
);
294 tui_update_locator_fullname (symtab_to_fullname (sal
.symtab
));
297 tui_update_locator_fullname ("?");
302 tui_get_begin_asm_address (struct gdbarch
**gdbarch_p
, CORE_ADDR
*addr_p
)
304 struct tui_locator_window
*locator
;
305 struct gdbarch
*gdbarch
= get_current_arch ();
308 locator
= tui_locator_win_info_ptr ();
310 if (locator
->addr
== 0)
312 struct bound_minimal_symbol main_symbol
;
314 /* Find address of the start of program.
315 Note: this should be language specific. */
316 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
317 if (main_symbol
.minsym
== 0)
318 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
319 if (main_symbol
.minsym
== 0)
320 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
321 if (main_symbol
.minsym
)
322 addr
= BMSYMBOL_VALUE_ADDRESS (main_symbol
);
326 else /* The target is executing. */
328 gdbarch
= locator
->gdbarch
;
329 addr
= locator
->addr
;
332 *gdbarch_p
= gdbarch
;
336 /* Determine what the low address will be to display in the TUI's
337 disassembly window. This may or may not be the same as the low
340 tui_get_low_disassembly_address (struct gdbarch
*gdbarch
,
341 CORE_ADDR low
, CORE_ADDR pc
)
345 /* Determine where to start the disassembly so that the pc is about
346 in the middle of the viewport. */
347 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
348 pc
= tui_find_disassembly_address (gdbarch
, pc
, -pos
);
355 /* Scroll the disassembly forward or backward vertically. */
357 tui_disasm_window::do_scroll_vertical (int num_to_scroll
)
359 if (!content
.empty ())
362 struct tui_line_or_address val
;
364 pc
= content
[0].line_or_addr
.u
.addr
;
365 if (num_to_scroll
>= 0)
370 val
.loa
= LOA_ADDRESS
;
371 val
.u
.addr
= tui_find_disassembly_address (gdbarch
, pc
, num_to_scroll
);
372 tui_update_source_window_as_is (this, gdbarch
,
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 tui_update_source_window (this, get_frame_arch (fi
),
425 sal
.symtab
, a
, TRUE
);
429 set_is_exec_point_at (a
);