gdb/gdbserver/utils.c

   1 /* General utility routines for the remote server for GDB.
   2    Copyright (C) 1986-2014 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "server.h"
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23 #if HAVE_ERRNO_H
  24 #include <errno.h>
  25 #endif
  26
  27 #ifdef IN_PROCESS_AGENT
  28 #  define PREFIX "ipa: "
  29 #  define TOOLNAME "GDBserver in-process agent"
  30 #else
  31 #  define PREFIX "gdbserver: "
  32 #  define TOOLNAME "GDBserver"
  33 #endif
  34
  35 /* Generally useful subroutines used throughout the program.  */
  36
  37 void
  38 malloc_failure (long size)
  39 {
  40   fprintf (stderr,
  41            PREFIX "ran out of memory while trying to allocate %lu bytes\n",
  42            (unsigned long) size);
  43   exit (1);
  44 }
  45
  46 /* Copy a string into a memory buffer.
  47    If malloc fails, this will print a message to stderr and exit.  */
  48
  49 char *
  50 xstrdup (const char *s)
  51 {
  52   char *ret = strdup (s);
  53   if (ret == NULL)
  54     malloc_failure (strlen (s) + 1);
  55   return ret;
  56 }
  57
  58 #ifndef IN_PROCESS_AGENT
  59
  60 /* Free a standard argv vector.  */
  61
  62 void
  63 freeargv (char **vector)
  64 {
  65   char **scan;
  66
  67   if (vector != NULL)
  68     {
  69       for (scan = vector; *scan != NULL; scan++)
  70         {
  71           free (*scan);
  72         }
  73       free (vector);
  74     }
  75 }
  76
  77 #endif
  78
  79 /* Print the system error message for errno, and also mention STRING
  80    as the file name for which the error was encountered.
  81    Then return to command level.  */
  82
  83 void
  84 perror_with_name (const char *string)
  85 {
  86   const char *err;
  87   char *combined;
  88
  89   err = strerror (errno);
  90   if (err == NULL)
  91     err = "unknown error";
  92
  93   combined = (char *) alloca (strlen (err) + strlen (string) + 3);
  94   strcpy (combined, string);
  95   strcat (combined, ": ");
  96   strcat (combined, err);
  97
  98   error ("%s.", combined);
  99 }
 100
 101 /* Print an error message and return to command level.
 102    STRING is the error message, used as a fprintf string,
 103    and ARG is passed as an argument to it.  */
 104
 105 void
 106 error (const char *string,...)
 107 {
 108 #ifndef IN_PROCESS_AGENT
 109   extern jmp_buf toplevel;
 110 #endif
 111   va_list args;
 112   va_start (args, string);
 113   fflush (stdout);
 114   vfprintf (stderr, string, args);
 115   fprintf (stderr, "\n");
 116 #ifndef IN_PROCESS_AGENT
 117   longjmp (toplevel, 1);
 118 #else
 119   exit (1);
 120 #endif
 121 }
 122
 123 /* Print an error message and exit reporting failure.
 124    This is for a error that we cannot continue from.
 125    STRING and ARG are passed to fprintf.  */
 126
 127 /* VARARGS */
 128 void
 129 fatal (const char *string,...)
 130 {
 131   va_list args;
 132   va_start (args, string);
 133   fprintf (stderr, PREFIX);
 134   vfprintf (stderr, string, args);
 135   fprintf (stderr, "\n");
 136   va_end (args);
 137   exit (1);
 138 }
 139
 140 /* VARARGS */
 141 void
 142 warning (const char *string,...)
 143 {
 144   va_list args;
 145   va_start (args, string);
 146   fprintf (stderr, PREFIX);
 147   vfprintf (stderr, string, args);
 148   fprintf (stderr, "\n");
 149   va_end (args);
 150 }
 151
 152 /* Report a problem internal to GDBserver, and exit.  */
 153
 154 void
 155 internal_error (const char *file, int line, const char *fmt, ...)
 156 {
 157   va_list args;
 158   va_start (args, fmt);
 159
 160   fprintf (stderr,  "\
 161 %s:%d: A problem internal to " TOOLNAME " has been detected.\n", file, line);
 162   vfprintf (stderr, fmt, args);
 163   fprintf (stderr, "\n");
 164   va_end (args);
 165   exit (1);
 166 }
 167
 168 /* Temporary storage using circular buffer.  */
 169 #define NUMCELLS 10
 170 #define CELLSIZE 50
 171
 172 /* Return the next entry in the circular buffer.  */
 173
 174 static char *
 175 get_cell (void)
 176 {
 177   static char buf[NUMCELLS][CELLSIZE];
 178   static int cell = 0;
 179   if (++cell >= NUMCELLS)
 180     cell = 0;
 181   return buf[cell];
 182 }
 183
 184 static char *
 185 decimal2str (char *sign, ULONGEST addr)
 186 {
 187   /* Steal code from valprint.c:print_decimal().  Should this worry
 188      about the real size of addr as the above does? */
 189   unsigned long temp[3];
 190   char *str = get_cell ();
 191   int i = 0;
 192   int width = 9;
 193
 194   do
 195     {
 196       temp[i] = addr % (1000 * 1000 * 1000);
 197       addr /= (1000 * 1000 * 1000);
 198       i++;
 199     }
 200   while (addr != 0 && i < (sizeof (temp) / sizeof (temp[0])));
 201
 202   switch (i)
 203     {
 204     case 1:
 205       xsnprintf (str, CELLSIZE, "%s%0*lu", sign, width, temp[0]);
 206       break;
 207     case 2:
 208       xsnprintf (str, CELLSIZE, "%s%0*lu%09lu", sign, width,
 209                  temp[1], temp[0]);
 210       break;
 211     case 3:
 212       xsnprintf (str, CELLSIZE, "%s%0*lu%09lu%09lu", sign, width,
 213                  temp[2], temp[1], temp[0]);
 214       break;
 215     default:
 216       internal_error (__FILE__, __LINE__,
 217                       "failed internal consistency check");
 218     }
 219
 220   return str;
 221 }
 222
 223 /* %u for ULONGEST.  The result is stored in a circular static buffer,
 224    NUMCELLS deep.  */
 225
 226 char *
 227 pulongest (ULONGEST u)
 228 {
 229   return decimal2str ("", u);
 230 }
 231
 232 /* %d for LONGEST.  The result is stored in a circular static buffer,
 233    NUMCELLS deep.  */
 234
 235 char *
 236 plongest (LONGEST l)
 237 {
 238   if (l < 0)
 239     return decimal2str ("-", -l);
 240   else
 241     return decimal2str ("", l);
 242 }
 243
 244 /* Eliminate warning from compiler on 32-bit systems.  */
 245 static int thirty_two = 32;
 246
 247 /* Convert a ULONGEST into a HEX string, like %lx.  The result is
 248    stored in a circular static buffer, NUMCELLS deep.  */
 249
 250 char *
 251 phex_nz (ULONGEST l, int sizeof_l)
 252 {
 253   char *str;
 254
 255   switch (sizeof_l)
 256     {
 257     case 8:
 258       {
 259         unsigned long high = (unsigned long) (l >> thirty_two);
 260         str = get_cell ();
 261         if (high == 0)
 262           xsnprintf (str, CELLSIZE, "%lx",
 263                      (unsigned long) (l & 0xffffffff));
 264         else
 265           xsnprintf (str, CELLSIZE, "%lx%08lx", high,
 266                      (unsigned long) (l & 0xffffffff));
 267         break;
 268       }
 269     case 4:
 270       str = get_cell ();
 271       xsnprintf (str, CELLSIZE, "%lx", (unsigned long) l);
 272       break;
 273     case 2:
 274       str = get_cell ();
 275       xsnprintf (str, CELLSIZE, "%x", (unsigned short) (l & 0xffff));
 276       break;
 277     default:
 278       str = phex_nz (l, sizeof (l));
 279       break;
 280     }
 281
 282   return str;
 283 }
 284
 285 /* Convert a CORE_ADDR into a HEX string, like %lx.
 286    The result is stored in a circular static buffer, NUMCELLS deep.  */
 287
 288 char *
 289 paddress (CORE_ADDR addr)
 290 {
 291   return phex_nz (addr, sizeof (CORE_ADDR));
 292 }
 293
 294 /* Convert a file descriptor into a printable string.  */
 295
 296 char *
 297 pfildes (gdb_fildes_t fd)
 298 {
 299 #if USE_WIN32API
 300   return phex_nz (fd, sizeof (gdb_fildes_t));
 301 #else
 302   return plongest (fd);
 303 #endif
 304 }