aboutsummaryrefslogtreecommitdiff
path: root/gdb/break-catch-exec.c
blob: 35b126ce9048e84472fec6ad481910344487a533 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
/* Everything about exec catchpoints, for GDB.

   Copyright (C) 1986-2024 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "annotate.h"
#include "arch-utils.h"
#include "breakpoint.h"
#include "cli/cli-decode.h"
#include "inferior.h"
#include "mi/mi-common.h"
#include "target.h"
#include "valprint.h"

/* Exec catchpoints.  */

/* An instance of this type is used to represent an exec catchpoint.
   A breakpoint is really of this type iff its ops pointer points to
   CATCH_EXEC_BREAKPOINT_OPS.  */

struct exec_catchpoint : public catchpoint
{
  exec_catchpoint (struct gdbarch *gdbarch, bool temp, const char *cond_string)
    : catchpoint (gdbarch, temp, cond_string)
  {
  }

  int insert_location (struct bp_location *) override;
  int remove_location (struct bp_location *,
		       enum remove_bp_reason reason) override;
  int breakpoint_hit (const struct bp_location *bl,
		      const address_space *aspace,
		      CORE_ADDR bp_addr,
		      const target_waitstatus &ws) override;
  enum print_stop_action print_it (const bpstat *bs) const override;
  bool print_one (const bp_location **) const override;
  void print_mention () const override;
  void print_recreate (struct ui_file *fp) const override;

  /* Filename of a program whose exec triggered this catchpoint.
     This field is only valid immediately after this catchpoint has
     triggered.  */
  gdb::unique_xmalloc_ptr<char> exec_pathname;
};

int
exec_catchpoint::insert_location (struct bp_location *bl)
{
  return target_insert_exec_catchpoint (inferior_ptid.pid ());
}

int
exec_catchpoint::remove_location (struct bp_location *bl,
				  enum remove_bp_reason reason)
{
  return target_remove_exec_catchpoint (inferior_ptid.pid ());
}

int
exec_catchpoint::breakpoint_hit (const struct bp_location *bl,
				 const address_space *aspace,
				 CORE_ADDR bp_addr,
				 const target_waitstatus &ws)
{
  if (ws.kind () != TARGET_WAITKIND_EXECD)
    return 0;

  exec_pathname = make_unique_xstrdup (ws.execd_pathname ());
  return 1;
}

enum print_stop_action
exec_catchpoint::print_it (const bpstat *bs) const
{
  struct ui_out *uiout = current_uiout;

  annotate_catchpoint (number);
  maybe_print_thread_hit_breakpoint (uiout);
  if (disposition == disp_del)
    uiout->text ("Temporary catchpoint ");
  else
    uiout->text ("Catchpoint ");
  if (uiout->is_mi_like_p ())
    {
      uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXEC));
      uiout->field_string ("disp", bpdisp_text (disposition));
    }
  uiout->field_signed ("bkptno", number);
  uiout->text (" (exec'd ");
  uiout->field_string ("new-exec", exec_pathname.get ());
  uiout->text ("), ");

  return PRINT_SRC_AND_LOC;
}

bool
exec_catchpoint::print_one (const bp_location **last_loc) const
{
  struct value_print_options opts;
  struct ui_out *uiout = current_uiout;

  get_user_print_options (&opts);

  /* Field 4, the address, is omitted (which makes the columns
     not line up too nicely with the headers, but the effect
     is relatively readable).  */
  if (opts.addressprint)
    uiout->field_skip ("addr");
  annotate_field (5);
  uiout->text ("exec");
  if (exec_pathname != NULL)
    {
      uiout->text (", program \"");
      uiout->field_string ("what", exec_pathname.get ());
      uiout->text ("\" ");
    }

  if (uiout->is_mi_like_p ())
    uiout->field_string ("catch-type", "exec");

  return true;
}

void
exec_catchpoint::print_mention () const
{
  gdb_printf (_("Catchpoint %d (exec)"), number);
}

/* Implement the "print_recreate" method for exec catchpoints.  */

void
exec_catchpoint::print_recreate (struct ui_file *fp) const
{
  gdb_printf (fp, "catch exec");
  print_recreate_thread (fp);
}

/* This function attempts to parse an optional "if <cond>" clause
   from the arg string.  If one is not found, it returns NULL.

   Else, it returns a pointer to the condition string.  (It does not
   attempt to evaluate the string against a particular block.)  And,
   it updates arg to point to the first character following the parsed
   if clause in the arg string.  */

const char *
ep_parse_optional_if_clause (const char **arg)
{
  const char *cond_string;

  if (((*arg)[0] != 'i') || ((*arg)[1] != 'f') || !isspace ((*arg)[2]))
    return NULL;

  /* Skip the "if" keyword.  */
  (*arg) += 2;

  /* Skip any extra leading whitespace, and record the start of the
     condition string.  */
  *arg = skip_spaces (*arg);
  cond_string = *arg;

  /* Assume that the condition occupies the remainder of the arg
     string.  */
  (*arg) += strlen (cond_string);

  return cond_string;
}

/* Commands to deal with catching events, such as signals, exceptions,
   process start/exit, etc.  */

static void
catch_exec_command_1 (const char *arg, int from_tty,
		      struct cmd_list_element *command)
{
  struct gdbarch *gdbarch = get_current_arch ();
  const char *cond_string = NULL;
  bool temp = command->context () == CATCH_TEMPORARY;

  if (!arg)
    arg = "";
  arg = skip_spaces (arg);

  /* The allowed syntax is:
     catch exec
     catch exec if <cond>

     First, check if there's an if clause.  */
  cond_string = ep_parse_optional_if_clause (&arg);

  if ((*arg != '\0') && !isspace (*arg))
    error (_("Junk at end of arguments."));

  std::unique_ptr<exec_catchpoint> c
    (new exec_catchpoint (gdbarch, temp, cond_string));

  install_breakpoint (0, std::move (c), 1);
}

void _initialize_break_catch_exec ();
void
_initialize_break_catch_exec ()
{
  add_catch_command ("exec", _("Catch calls to exec."),
		     catch_exec_command_1,
		     NULL,
		     CATCH_PERMANENT,
		     CATCH_TEMPORARY);
}