gdb/alpha-osf1-tdep.c

   1 /* Target-dependent code for OSF/1 on Alpha.
   2    Copyright (C) 2002, 2003, 2007, 2008, 2009 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 "defs.h"
  20 #include "frame.h"
  21 #include "gdbcore.h"
  22 #include "value.h"
  23 #include "osabi.h"
  24 #include "gdb_string.h"
  25 #include "objfiles.h"
  26
  27 #include "alpha-tdep.h"
  28
  29 static int
  30 alpha_osf1_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
  31 {
  32   return (func_name != NULL && strcmp ("__sigtramp", func_name) == 0);
  33 }
  34
  35 static CORE_ADDR
  36 alpha_osf1_sigcontext_addr (struct frame_info *this_frame)
  37 {
  38   struct frame_info *next_frame = get_next_frame (this_frame);
  39   struct frame_id next_id = null_frame_id;
  40
  41   if (next_frame != NULL)
  42     next_id = get_frame_id (next_frame);
  43
  44   return (read_memory_integer (next_id.stack_addr, 8));
  45 }
  46
  47 static void
  48 alpha_osf1_init_abi (struct gdbarch_info info,
  49                      struct gdbarch *gdbarch)
  50 {
  51   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  52
  53   /* Hook into the MDEBUG frame unwinder.  */
  54   alpha_mdebug_init_abi (info, gdbarch);
  55
  56   /* The next/step support via procfs on OSF1 is broken when running
  57      on multi-processor machines. We need to use software single stepping
  58      instead.  */
  59   set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
  60
  61   tdep->sigcontext_addr = alpha_osf1_sigcontext_addr;
  62   tdep->pc_in_sigtramp = alpha_osf1_pc_in_sigtramp;
  63
  64   tdep->jb_pc = 2;
  65   tdep->jb_elt_size = 8;
  66 }
  67
  68 /* Provide a prototype to silence -Wmissing-prototypes.  */
  69 extern initialize_file_ftype _initialize_alpha_osf1_tdep;
  70
  71 void
  72 _initialize_alpha_osf1_tdep (void)
  73 {
  74   gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1,
  75                           alpha_osf1_init_abi);
  76 }