gdb/sparc64fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/sparc64.
   2
   3    Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 #include "fbsd-nat.h"
  26 #include "sparc64-tdep.h"
  27 #include "sparc-nat.h"
  28 \f
  29
  30 /* Support for debugging kernel virtual memory images.  */
  31
  32 #include <sys/types.h>
  33 #include <machine/pcb.h>
  34
  35 #include "bsd-kvm.h"
  36
  37 static int
  38 sparc64fbsd_kvm_supply_pcb (struct regcache *regcache, struct pcb *pcb)
  39 {
  40   /* The following is true for FreeBSD 5.4:
  41
  42      The pcb contains %sp and %pc.  Since the register windows are
  43      explicitly flushed, we can find the `local' and `in' registers on
  44      the stack.  */
  45
  46   /* The stack pointer shouldn't be zero.  */
  47   if (pcb->pcb_sp == 0)
  48     return 0;
  49
  50   regcache_raw_supply (regcache, SPARC_SP_REGNUM, &pcb->pcb_sp);
  51   regcache_raw_supply (regcache, SPARC64_PC_REGNUM, &pcb->pcb_pc);
  52
  53   /* Synthesize %npc.  */
  54   pcb->pcb_pc += 4;
  55   regcache_raw_supply (regcache, SPARC64_NPC_REGNUM, &pcb->pcb_pc);
  56
  57   /* Read `local' and `in' registers from the stack.  */
  58   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
  59
  60   return 1;
  61 }
  62 \f
  63
  64 /* Provide a prototype to silence -Wmissing-prototypes.  */
  65 void _initialize_sparc64fbsd_nat (void);
  66
  67 void
  68 _initialize_sparc64fbsd_nat (void)
  69 {
  70   struct target_ops *t;
  71
  72   /* Add some extra features to the generic SPARC target.  */
  73   t = sparc_target ();
  74   t->to_pid_to_exec_file = fbsd_pid_to_exec_file;
  75   t->to_find_memory_regions = fbsd_find_memory_regions;
  76   t->to_make_corefile_notes = fbsd_make_corefile_notes;
  77   add_target (t);
  78
  79   sparc_gregset = &sparc64fbsd_gregset;
  80
  81   /* Support debugging kernel virtual memory images.  */
  82   bsd_kvm_add_target (sparc64fbsd_kvm_supply_pcb);
  83 }