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 val
.loa
= LOA_ADDRESS
;
259 val
.u
.addr
= start_addr
;
260 tui_add_win_to_layout (DISASSEM_WIN
);
261 tui_update_source_window (TUI_DISASM_WIN
, gdbarch
, s
, val
, FALSE
);
263 /* If the focus was in the src win, put it in the asm win, if the
264 source view isn't split. */
265 if (tui_current_layout () != SRC_DISASSEM_COMMAND
266 && win_with_focus
== TUI_SRC_WIN
)
267 tui_set_win_focus_to (TUI_DISASM_WIN
);
271 /* Function to display the disassembly window. */
273 tui_show_disassem_and_update_source (struct gdbarch
*gdbarch
,
274 CORE_ADDR start_addr
)
276 struct symtab_and_line sal
;
278 tui_show_disassem (gdbarch
, start_addr
);
279 if (tui_current_layout () == SRC_DISASSEM_COMMAND
)
281 struct tui_line_or_address val
;
283 /* Update what is in the source window if it is displayed too,
284 note that it follows what is in the disassembly window and
286 sal
= find_pc_line (start_addr
, 0);
288 val
.u
.line_no
= sal
.line
;
289 tui_update_source_window (TUI_SRC_WIN
, gdbarch
, sal
.symtab
, val
, TRUE
);
292 set_current_source_symtab_and_line (sal
);
293 tui_update_locator_fullname (symtab_to_fullname (sal
.symtab
));
296 tui_update_locator_fullname ("?");
301 tui_get_begin_asm_address (struct gdbarch
**gdbarch_p
, CORE_ADDR
*addr_p
)
303 struct tui_locator_window
*locator
;
304 struct gdbarch
*gdbarch
= get_current_arch ();
307 locator
= tui_locator_win_info_ptr ();
309 if (locator
->addr
== 0)
311 struct bound_minimal_symbol main_symbol
;
313 /* Find address of the start of program.
314 Note: this should be language specific. */
315 main_symbol
= lookup_minimal_symbol ("main", NULL
, NULL
);
316 if (main_symbol
.minsym
== 0)
317 main_symbol
= lookup_minimal_symbol ("MAIN", NULL
, NULL
);
318 if (main_symbol
.minsym
== 0)
319 main_symbol
= lookup_minimal_symbol ("_start", NULL
, NULL
);
320 if (main_symbol
.minsym
)
321 addr
= BMSYMBOL_VALUE_ADDRESS (main_symbol
);
325 else /* The target is executing. */
327 gdbarch
= locator
->gdbarch
;
328 addr
= locator
->addr
;
331 *gdbarch_p
= gdbarch
;
335 /* Determine what the low address will be to display in the TUI's
336 disassembly window. This may or may not be the same as the low
339 tui_get_low_disassembly_address (struct gdbarch
*gdbarch
,
340 CORE_ADDR low
, CORE_ADDR pc
)
344 /* Determine where to start the disassembly so that the pc is about
345 in the middle of the viewport. */
346 pos
= tui_default_win_viewport_height (DISASSEM_WIN
, DISASSEM_COMMAND
) / 2;
347 pc
= tui_find_disassembly_address (gdbarch
, pc
, -pos
);
354 /* Scroll the disassembly forward or backward vertically. */
356 tui_disasm_window::do_scroll_vertical (int num_to_scroll
)
358 if (!content
.empty ())
361 struct tui_line_or_address val
;
363 pc
= content
[0].line_or_addr
.u
.addr
;
364 if (num_to_scroll
>= 0)
369 val
.loa
= LOA_ADDRESS
;
370 val
.u
.addr
= tui_find_disassembly_address (gdbarch
, pc
, num_to_scroll
);
371 tui_update_source_window_as_is (this, gdbarch
,
377 tui_disasm_window::location_matches_p (struct bp_location
*loc
, int line_no
)
379 return (content
[line_no
].line_or_addr
.loa
== LOA_ADDRESS
380 && content
[line_no
].line_or_addr
.u
.addr
== loc
->address
);