gdb/fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD, architecture-independent.
   2
   3    Copyright (C) 2002-2014 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdbcore.h"
  22 #include "inferior.h"
  23 #include "regcache.h"
  24 #include "regset.h"
  25 #include "gdbthread.h"
  26
  27 #include "gdb_assert.h"
  28 #include <string.h>
  29
  30 #include "elf-bfd.h"
  31 #include "fbsd-tdep.h"
  32
  33
  34 static int
  35 find_signalled_thread (struct thread_info *info, void *data)
  36 {
  37   if (info->suspend.stop_signal != GDB_SIGNAL_0
  38       && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid))
  39     return 1;
  40
  41   return 0;
  42 }
  43
  44 static enum gdb_signal
  45 find_stop_signal (void)
  46 {
  47   struct thread_info *info =
  48     iterate_over_threads (find_signalled_thread, NULL);
  49
  50   if (info)
  51     return info->suspend.stop_signal;
  52   else
  53     return GDB_SIGNAL_0;
  54 }
  55
  56 struct fbsd_collect_regset_section_cb_data
  57 {
  58   const struct regcache *regcache;
  59   bfd *obfd;
  60   char *note_data;
  61   int *note_size;
  62 };
  63
  64 static void
  65 fbsd_collect_regset_section_cb (const char *sect_name, int size,
  66                                 const struct regset *regset,
  67                                 const char *human_name, void *cb_data)
  68 {
  69   char *buf;
  70   struct fbsd_collect_regset_section_cb_data *data = cb_data;
  71
  72   gdb_assert (regset->collect_regset);
  73
  74   buf = xmalloc (size);
  75   regset->collect_regset (regset, data->regcache, -1, buf, size);
  76
  77   /* PRSTATUS still needs to be treated specially.  */
  78   if (strcmp (sect_name, ".reg") == 0)
  79     data->note_data = (char *) elfcore_write_prstatus
  80       (data->obfd, data->note_data, data->note_size,
  81        ptid_get_pid (inferior_ptid), find_stop_signal (), buf);
  82   else
  83     data->note_data = (char *) elfcore_write_register_note
  84       (data->obfd, data->note_data, data->note_size,
  85        sect_name, buf, size);
  86   xfree (buf);
  87 }
  88
  89 /* Create appropriate note sections for a corefile, returning them in
  90    allocated memory.  */
  91
  92 static char *
  93 fbsd_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size)
  94 {
  95   const struct regcache *regcache = get_current_regcache ();
  96   char *note_data;
  97   Elf_Internal_Ehdr *i_ehdrp;
  98   struct fbsd_collect_regset_section_cb_data data;
  99
 100   /* Put a "FreeBSD" label in the ELF header.  */
 101   i_ehdrp = elf_elfheader (obfd);
 102   i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
 103
 104   gdb_assert (gdbarch_iterate_over_regset_sections_p (gdbarch));
 105
 106   data.regcache = regcache;
 107   data.obfd = obfd;
 108   data.note_data = NULL;
 109   data.note_size = note_size;
 110   gdbarch_iterate_over_regset_sections (gdbarch,
 111                                         fbsd_collect_regset_section_cb,
 112                                         &data, regcache);
 113   note_data = data.note_data;
 114
 115   if (get_exec_file (0))
 116     {
 117       const char *fname = lbasename (get_exec_file (0));
 118       char *psargs = xstrdup (fname);
 119
 120       if (get_inferior_args ())
 121         psargs = reconcat (psargs, psargs, " ", get_inferior_args (),
 122                            (char *) NULL);
 123
 124       note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
 125                                           fname, psargs);
 126     }
 127
 128   return note_data;
 129 }
 130
 131 /* To be called from GDB_OSABI_FREEBSD_ELF handlers. */
 132
 133 void
 134 fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 135 {
 136   set_gdbarch_make_corefile_notes (gdbarch, fbsd_make_corefile_notes);
 137 }