gdb/sparc64-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/sparc64.
   2
   3    Copyright (C) 2003-2021 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 "regcache.h"
  22 #include "target.h"
  23
  24 #include "fbsd-nat.h"
  25 #include "sparc64-tdep.h"
  26 #include "sparc-nat.h"
  27 \f
  28
  29 /* Support for debugging kernel virtual memory images.  */
  30
  31 #include <sys/types.h>
  32 #include <machine/pcb.h>
  33
  34 #include "bsd-kvm.h"
  35
  36 static int
  37 sparc64fbsd_kvm_supply_pcb (struct regcache *regcache, struct pcb *pcb)
  38 {
  39   /* The following is true for FreeBSD 5.4:
  40
  41      The pcb contains %sp and %pc.  Since the register windows are
  42      explicitly flushed, we can find the `local' and `in' registers on
  43      the stack.  */
  44
  45   /* The stack pointer shouldn't be zero.  */
  46   if (pcb->pcb_sp == 0)
  47     return 0;
  48
  49   regcache->raw_supply (SPARC_SP_REGNUM, &pcb->pcb_sp);
  50   regcache->raw_supply (SPARC64_PC_REGNUM, &pcb->pcb_pc);
  51
  52   /* Synthesize %npc.  */
  53   pcb->pcb_pc += 4;
  54   regcache->raw_supply (SPARC64_NPC_REGNUM, &pcb->pcb_pc);
  55
  56   /* Read `local' and `in' registers from the stack.  */
  57   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
  58
  59   return 1;
  60 }
  61
  62 /* Add some extra features to the generic SPARC target.  */
  63 static sparc_target<fbsd_nat_target> the_sparc64_fbsd_nat_target;
  64
  65 void _initialize_sparc64fbsd_nat ();
  66 void
  67 _initialize_sparc64fbsd_nat ()
  68 {
  69   add_inf_child_target (&the_sparc64_fbsd_nat_target);
  70
  71   sparc_gregmap = &sparc64fbsd_gregmap;
  72
  73   /* Support debugging kernel virtual memory images.  */
  74   bsd_kvm_add_target (sparc64fbsd_kvm_supply_pcb);
  75 }