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 (struct gdbarch *gdbarch,
  31                            CORE_ADDR pc, char *func_name)
  32 {
  33   return (func_name != NULL && strcmp ("__sigtramp", func_name) == 0);
  34 }
  35
  36 static CORE_ADDR
  37 alpha_osf1_sigcontext_addr (struct frame_info *this_frame)
  38 {
  39   struct gdbarch *gdbarch = get_frame_arch (this_frame);
  40   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  41   struct frame_info *next_frame = get_next_frame (this_frame);
  42   struct frame_id next_id = null_frame_id;
  43
  44   if (next_frame != NULL)
  45     next_id = get_frame_id (next_frame);
  46
  47   return (read_memory_integer (next_id.stack_addr, 8, byte_order));
  48 }
  49
  50 static void
  51 alpha_osf1_init_abi (struct gdbarch_info info,
  52                      struct gdbarch *gdbarch)
  53 {
  54   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  55
  56   /* Hook into the MDEBUG frame unwinder.  */
  57   alpha_mdebug_init_abi (info, gdbarch);
  58
  59   /* The next/step support via procfs on OSF1 is broken when running
  60      on multi-processor machines. We need to use software single stepping
  61      instead.  */
  62   set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
  63
  64   tdep->sigcontext_addr = alpha_osf1_sigcontext_addr;
  65   tdep->pc_in_sigtramp = alpha_osf1_pc_in_sigtramp;
  66
  67   tdep->jb_pc = 2;
  68   tdep->jb_elt_size = 8;
  69 }
  70
  71 /* Provide a prototype to silence -Wmissing-prototypes.  */
  72 extern initialize_file_ftype _initialize_alpha_osf1_tdep;
  73
  74 void
  75 _initialize_alpha_osf1_tdep (void)
  76 {
  77   gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1,
  78                           alpha_osf1_init_abi);
  79 }