gdb/alpha-osf1-tdep.c

   1 /* Target-dependent code for OSF/1 on Alpha.
   2    Copyright 2002 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
  26 #include "alpha-tdep.h"
  27
  28 /* Under OSF/1, the __sigtramp routine is frameless and has a frame
  29    size of zero, but we are able to backtrace through it.  */
  30 static CORE_ADDR
  31 alpha_osf1_skip_sigtramp_frame (struct frame_info *frame, CORE_ADDR pc)
  32 {
  33   char *name;
  34
  35   find_pc_partial_function (pc, &name, (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
  36   if (PC_IN_SIGTRAMP (pc, name))
  37     return frame->frame;
  38   return 0;
  39 }
  40
  41 static int
  42 alpha_osf1_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
  43 {
  44   return (func_name != NULL && STREQ ("__sigtramp", func_name));
  45 }
  46
  47 static CORE_ADDR
  48 alpha_osf1_sigcontext_addr (struct frame_info *frame)
  49 {
  50   return (read_memory_integer (frame->next ? frame->next->frame
  51                                            : frame->frame, 8));
  52 }
  53
  54 static void
  55 alpha_osf1_init_abi (struct gdbarch_info info,
  56                      struct gdbarch *gdbarch)
  57 {
  58   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  59
  60   set_gdbarch_pc_in_sigtramp (gdbarch, alpha_osf1_pc_in_sigtramp);
  61
  62   tdep->skip_sigtramp_frame = alpha_osf1_skip_sigtramp_frame;
  63   tdep->sigcontext_addr = alpha_osf1_sigcontext_addr;
  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, GDB_OSABI_OSF1, alpha_osf1_init_abi);
  73 }