gdb/alpha-osf1-tdep.c

   1 /* Target-dependent code for OSF/1 on Alpha.
   2    Copyright (C) 2002, 2003, 2007, 2008, 2009, 2010, 2011
   3    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 "frame.h"
  22 #include "gdbcore.h"
  23 #include "value.h"
  24 #include "osabi.h"
  25 #include "gdb_string.h"
  26 #include "objfiles.h"
  27
  28 #include "alpha-tdep.h"
  29
  30 static int
  31 alpha_osf1_pc_in_sigtramp (struct gdbarch *gdbarch,
  32                            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 *this_frame)
  39 {
  40   struct gdbarch *gdbarch = get_frame_arch (this_frame);
  41   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  42   struct frame_info *next_frame = get_next_frame (this_frame);
  43   struct frame_id next_id = null_frame_id;
  44
  45   if (next_frame != NULL)
  46     next_id = get_frame_id (next_frame);
  47
  48   return (read_memory_integer (next_id.stack_addr, 8, byte_order));
  49 }
  50
  51 static void
  52 alpha_osf1_init_abi (struct gdbarch_info info,
  53                      struct gdbarch *gdbarch)
  54 {
  55   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  56
  57   /* Hook into the MDEBUG frame unwinder.  */
  58   alpha_mdebug_init_abi (info, gdbarch);
  59
  60   /* The next/step support via procfs on OSF1 is broken when running
  61      on multi-processor machines.  We need to use software single
  62      stepping instead.  */
  63   set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
  64
  65   tdep->sigcontext_addr = alpha_osf1_sigcontext_addr;
  66   tdep->pc_in_sigtramp = alpha_osf1_pc_in_sigtramp;
  67
  68   tdep->jb_pc = 2;
  69   tdep->jb_elt_size = 8;
  70 }
  71
  72 /* Provide a prototype to silence -Wmissing-prototypes.  */
  73 extern initialize_file_ftype _initialize_alpha_osf1_tdep;
  74
  75 void
  76 _initialize_alpha_osf1_tdep (void)
  77 {
  78   gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OSF1,
  79                           alpha_osf1_init_abi);
  80 }