summaryrefslogtreecommitdiff
path: root/gdb/gdbserver/utils.c
blob: 9706d7484d8491ec8c1e1df56e1f6c76870f0e55 (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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
/* General utility routines for the remote server for GDB.
   Copyright (C) 1986-2013 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 "server.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#if HAVE_ERRNO_H
#include <errno.h>
#endif

#ifdef IN_PROCESS_AGENT
#  define PREFIX "ipa: "
#  define TOOLNAME "GDBserver in-process agent"
#else
#  define PREFIX "gdbserver: "
#  define TOOLNAME "GDBserver"
#endif

/* Generally useful subroutines used throughout the program.  */

void
malloc_failure (long size)
{
  fprintf (stderr,
	   PREFIX "ran out of memory while trying to allocate %lu bytes\n",
	   (unsigned long) size);
  exit (1);
}

/* Copy a string into a memory buffer.
   If malloc fails, this will print a message to stderr and exit.  */

char *
xstrdup (const char *s)
{
  char *ret = strdup (s);
  if (ret == NULL)
    malloc_failure (strlen (s) + 1);
  return ret;
}

#ifndef IN_PROCESS_AGENT

/* Free a standard argv vector.  */

void
freeargv (char **vector)
{
  char **scan;

  if (vector != NULL)
    {
      for (scan = vector; *scan != NULL; scan++)
	{
	  free (*scan);
	}
      free (vector);
    }
}

#endif

/* Print the system error message for errno, and also mention STRING
   as the file name for which the error was encountered.
   Then return to command level.  */

void
perror_with_name (const char *string)
{
  const char *err;
  char *combined;

  err = strerror (errno);
  if (err == NULL)
    err = "unknown error";

  combined = (char *) alloca (strlen (err) + strlen (string) + 3);
  strcpy (combined, string);
  strcat (combined, ": ");
  strcat (combined, err);

  error ("%s.", combined);
}

/* Print an error message and return to command level.
   STRING is the error message, used as a fprintf string,
   and ARG is passed as an argument to it.  */

void
error (const char *string,...)
{
#ifndef IN_PROCESS_AGENT
  extern jmp_buf toplevel;
#endif
  va_list args;
  va_start (args, string);
  fflush (stdout);
  vfprintf (stderr, string, args);
  fprintf (stderr, "\n");
#ifndef IN_PROCESS_AGENT
  longjmp (toplevel, 1);
#else
  exit (1);
#endif
}

/* Print an error message and exit reporting failure.
   This is for a error that we cannot continue from.
   STRING and ARG are passed to fprintf.  */

/* VARARGS */
void
fatal (const char *string,...)
{
  va_list args;
  va_start (args, string);
  fprintf (stderr, PREFIX);
  vfprintf (stderr, string, args);
  fprintf (stderr, "\n");
  va_end (args);
  exit (1);
}

/* VARARGS */
void
warning (const char *string,...)
{
  va_list args;
  va_start (args, string);
  fprintf (stderr, PREFIX);
  vfprintf (stderr, string, args);
  fprintf (stderr, "\n");
  va_end (args);
}

/* Report a problem internal to GDBserver, and exit.  */

void
internal_error (const char *file, int line, const char *fmt, ...)
{
  va_list args;
  va_start (args, fmt);

  fprintf (stderr,  "\
%s:%d: A problem internal to " TOOLNAME " has been detected.\n", file, line);
  vfprintf (stderr, fmt, args);
  fprintf (stderr, "\n");
  va_end (args);
  exit (1);
}

/* Temporary storage using circular buffer.  */
#define NUMCELLS 10
#define CELLSIZE 50

/* Return the next entry in the circular buffer.  */

static char *
get_cell (void)
{
  static char buf[NUMCELLS][CELLSIZE];
  static int cell = 0;
  if (++cell >= NUMCELLS)
    cell = 0;
  return buf[cell];
}

static char *
decimal2str (char *sign, ULONGEST addr)
{
  /* Steal code from valprint.c:print_decimal().  Should this worry
     about the real size of addr as the above does? */
  unsigned long temp[3];
  char *str = get_cell ();
  int i = 0;
  int width = 9;

  do
    {
      temp[i] = addr % (1000 * 1000 * 1000);
      addr /= (1000 * 1000 * 1000);
      i++;
    }
  while (addr != 0 && i < (sizeof (temp) / sizeof (temp[0])));

  switch (i)
    {
    case 1:
      xsnprintf (str, CELLSIZE, "%s%0*lu", sign, width, temp[0]);
      break;
    case 2:
      xsnprintf (str, CELLSIZE, "%s%0*lu%09lu", sign, width,
		 temp[1], temp[0]);
      break;
    case 3:
      xsnprintf (str, CELLSIZE, "%s%0*lu%09lu%09lu", sign, width,
		 temp[2], temp[1], temp[0]);
      break;
    default:
      internal_error (__FILE__, __LINE__,
		      "failed internal consistency check");
    }

  return str;
}

/* %u for ULONGEST.  The result is stored in a circular static buffer,
   NUMCELLS deep.  */

char *
pulongest (ULONGEST u)
{
  return decimal2str ("", u);
}

/* %d for LONGEST.  The result is stored in a circular static buffer,
   NUMCELLS deep.  */

char *
plongest (LONGEST l)
{
  if (l < 0)
    return decimal2str ("-", -l);
  else
    return decimal2str ("", l);
}

/* Eliminate warning from compiler on 32-bit systems.  */
static int thirty_two = 32;

/* Convert a ULONGEST into a HEX string, like %lx.  The result is
   stored in a circular static buffer, NUMCELLS deep.  */

char *
phex_nz (ULONGEST l, int sizeof_l)
{
  char *str;

  switch (sizeof_l)
    {
    case 8:
      {
	unsigned long high = (unsigned long) (l >> thirty_two);
	str = get_cell ();
	if (high == 0)
	  xsnprintf (str, CELLSIZE, "%lx",
		     (unsigned long) (l & 0xffffffff));
	else
	  xsnprintf (str, CELLSIZE, "%lx%08lx", high,
		     (unsigned long) (l & 0xffffffff));
	break;
      }
    case 4:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%lx", (unsigned long) l);
      break;
    case 2:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%x", (unsigned short) (l & 0xffff));
      break;
    default:
      str = phex_nz (l, sizeof (l));
      break;
    }

  return str;
}

/* Convert a CORE_ADDR into a HEX string, like %lx.
   The result is stored in a circular static buffer, NUMCELLS deep.  */

char *
paddress (CORE_ADDR addr)
{
  return phex_nz (addr, sizeof (CORE_ADDR));
}

/* Convert a file descriptor into a printable string.  */

char *
pfildes (gdb_fildes_t fd)
{
#if USE_WIN32API
  return phex_nz (fd, sizeof (gdb_fildes_t));
#else
  return plongest (fd);
#endif
}