gdb/alpha-osf1-tdep.c

   1 /* Target-dependent code for OSF/1 on Alpha.
   2    Copyright 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., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, 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 *frame)
  39 {
  40   struct frame_info *next_frame = get_next_frame (frame);
  41
  42   if (next_frame != NULL)
  43     return (read_memory_integer (get_frame_base (next_frame), 8));
  44   else
  45     return (read_memory_integer (get_frame_base (frame), 8));
  46 }
  47
  48 static void
  49 alpha_osf1_init_abi (struct gdbarch_info info,
  50                      struct gdbarch *gdbarch)
  51 {
  52   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  53
  54   /* Hook into the MDEBUG frame unwinder.  */
  55   alpha_mdebug_init_abi (info, gdbarch);
  56
  57   /* The next/step support via procfs on OSF1 is broken when running
  58      on multi-processor machines. We need to use software single stepping
  59      instead.  */
  60   set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
  61
  62   tdep->sigcontext_addr = alpha_osf1_sigcontext_addr;
  63   tdep->pc_in_sigtramp = alpha_osf1_pc_in_sigtramp;
  64
  65   tdep->jb_pc = 2;
  66   tdep->jb_elt_size = 8;
  67 }
  68
  69 void
  70 _initialize_alpha_osf1_tdep (void)
  71 {
  72   gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1,
  73                           alpha_osf1_init_abi);
  74 }