gnu/dist/gdb6/gdb/alpha-osf1-tdep.c

   1 /* Target-dependent code for OSF/1 on Alpha.
   2    Copyright (C) 2002, 2003 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 2 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, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #include "defs.h"
  22 #include "frame.h"
  23 #include "gdbcore.h"
  24 #include "value.h"
  25 #include "osabi.h"
  26 #include "gdb_string.h"
  27 #include "objfiles.h"
  28
  29 #include "alpha-tdep.h"
  30
  31 static int
  32 alpha_osf1_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
  33 {
  34   return (func_name != NULL && strcmp ("__sigtramp", func_name) == 0);
  35 }
  36
  37 static CORE_ADDR
  38 alpha_osf1_sigcontext_addr (struct frame_info *next_frame)
  39 {
  40   const struct frame_id next_id = get_frame_id (next_frame);
  41
  42   return (read_memory_integer (next_id.stack_addr, 8));
  43 }
  44
  45 static void
  46 alpha_osf1_init_abi (struct gdbarch_info info,
  47                      struct gdbarch *gdbarch)
  48 {
  49   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  50
  51   /* Hook into the MDEBUG frame unwinder.  */
  52   alpha_mdebug_init_abi (info, gdbarch);
  53
  54   /* The next/step support via procfs on OSF1 is broken when running
  55      on multi-processor machines. We need to use software single stepping
  56      instead.  */
  57   set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
  58
  59   tdep->sigcontext_addr = alpha_osf1_sigcontext_addr;
  60   tdep->pc_in_sigtramp = alpha_osf1_pc_in_sigtramp;
  61
  62   tdep->jb_pc = 2;
  63   tdep->jb_elt_size = 8;
  64 }
  65
  66 void
  67 _initialize_alpha_osf1_tdep (void)
  68 {
  69   gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1,
  70                           alpha_osf1_init_abi);
  71 }