gdb/sparc64-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/sparc64.
   2
   3    Copyright (C) 2003-2024 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 "regcache.h"
  21 #include "target.h"
  22
  23 #include "fbsd-nat.h"
  24 #include "sparc64-tdep.h"
  25 #include "sparc-nat.h"
  26 \f
  27
  28 /* Support for debugging kernel virtual memory images.  */
  29
  30 #include <sys/types.h>
  31 #include <machine/pcb.h>
  32
  33 #include "bsd-kvm.h"
  34
  35 static int
  36 sparc64fbsd_kvm_supply_pcb (struct regcache *regcache, struct pcb *pcb)
  37 {
  38   /* The following is true for FreeBSD 5.4:
  39
  40      The pcb contains %sp and %pc.  Since the register windows are
  41      explicitly flushed, we can find the `local' and `in' registers on
  42      the stack.  */
  43
  44   /* The stack pointer shouldn't be zero.  */
  45   if (pcb->pcb_sp == 0)
  46     return 0;
  47
  48   regcache->raw_supply (SPARC_SP_REGNUM, &pcb->pcb_sp);
  49   regcache->raw_supply (SPARC64_PC_REGNUM, &pcb->pcb_pc);
  50
  51   /* Synthesize %npc.  */
  52   pcb->pcb_pc += 4;
  53   regcache->raw_supply (SPARC64_NPC_REGNUM, &pcb->pcb_pc);
  54
  55   /* Read `local' and `in' registers from the stack.  */
  56   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
  57
  58   return 1;
  59 }
  60
  61 /* Add some extra features to the generic SPARC target.  */
  62 static sparc_target<fbsd_nat_target> the_sparc64_fbsd_nat_target;
  63
  64 void _initialize_sparc64fbsd_nat ();
  65 void
  66 _initialize_sparc64fbsd_nat ()
  67 {
  68   add_inf_child_target (&the_sparc64_fbsd_nat_target);
  69
  70   sparc_gregmap = &sparc64fbsd_gregmap;
  71
  72   /* Support debugging kernel virtual memory images.  */
  73   bsd_kvm_add_target (sparc64fbsd_kvm_supply_pcb);
  74 }