gdb/sparc64fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/sparc64.
   2
   3    Copyright (C) 2003, 2004, 2005, 2007 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 2 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, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "regcache.h"
  24 #include "target.h"
  25
  26 #include "fbsd-nat.h"
  27 #include "sparc64-tdep.h"
  28 #include "sparc-nat.h"
  29 \f
  30
  31 /* Support for debugging kernel virtual memory images.  */
  32
  33 #include <sys/types.h>
  34 #include <machine/pcb.h>
  35
  36 #include "bsd-kvm.h"
  37
  38 static int
  39 sparc64fbsd_kvm_supply_pcb (struct regcache *regcache, struct pcb *pcb)
  40 {
  41   /* The following is true for FreeBSD 5.4:
  42
  43      The pcb contains %sp and %pc.  Since the register windows are
  44      explicitly flushed, we can find the `local' and `in' registers on
  45      the stack.  */
  46
  47   /* The stack pointer shouldn't be zero.  */
  48   if (pcb->pcb_sp == 0)
  49     return 0;
  50
  51   regcache_raw_supply (regcache, SPARC_SP_REGNUM, &pcb->pcb_sp);
  52   regcache_raw_supply (regcache, SPARC64_PC_REGNUM, &pcb->pcb_pc);
  53
  54   /* Synthesize %npc.  */
  55   pcb->pcb_pc += 4;
  56   regcache_raw_supply (regcache, SPARC64_NPC_REGNUM, &pcb->pcb_pc);
  57
  58   /* Read `local' and `in' registers from the stack.  */
  59   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
  60
  61   return 1;
  62 }
  63 \f
  64
  65 /* Provide a prototype to silence -Wmissing-prototypes.  */
  66 void _initialize_sparc64fbsd_nat (void);
  67
  68 void
  69 _initialize_sparc64fbsd_nat (void)
  70 {
  71   struct target_ops *t;
  72
  73   /* Add some extra features to the generic SPARC target.  */
  74   t = sparc_target ();
  75   t->to_pid_to_exec_file = fbsd_pid_to_exec_file;
  76   t->to_find_memory_regions = fbsd_find_memory_regions;
  77   t->to_make_corefile_notes = fbsd_make_corefile_notes;
  78   add_target (t);
  79
  80   sparc_gregset = &sparc64fbsd_gregset;
  81
  82   /* Support debugging kernel virtual memory images.  */
  83   bsd_kvm_add_target (sparc64fbsd_kvm_supply_pcb);
  84 }