gdb/sparc-nbsd-nat.c

   1 /* Native-dependent code for NetBSD/sparc.
   2
   3    Copyright (C) 2002-2020 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 "sparc-tdep.h"
  25 #include "sparc-nat.h"
  26
  27 /* Support for debugging kernel virtual memory images.  */
  28
  29 #include <sys/types.h>
  30 #include <machine/pcb.h>
  31
  32 #include "bsd-kvm.h"
  33
  34 static int
  35 sparc32nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
  36 {
  37   /* The following is true for NetBSD 1.6.2:
  38
  39      The pcb contains %sp, %pc, %psr and %wim.  From this information
  40      we reconstruct the register state as it would look when we just
  41      returned from cpu_switch().  */
  42
  43   /* The stack pointer shouldn't be zero.  */
  44   if (pcb->pcb_sp == 0)
  45     return 0;
  46
  47   regcache->raw_supply (SPARC_SP_REGNUM, &pcb->pcb_sp);
  48   regcache->raw_supply (SPARC_O7_REGNUM, &pcb->pcb_pc);
  49   regcache->raw_supply (SPARC32_PSR_REGNUM, &pcb->pcb_psr);
  50   regcache->raw_supply (SPARC32_WIM_REGNUM, &pcb->pcb_wim);
  51   regcache->raw_supply (SPARC32_PC_REGNUM, &pcb->pcb_pc);
  52
  53   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
  54
  55   return 1;
  56 }
  57
  58 static sparc_target<inf_ptrace_target> the_sparc_nbsd_nat_target;
  59
  60 void
  61 _initialize_sparcnbsd_nat (void)
  62 {
  63   sparc_gregmap = &sparc32nbsd_gregmap;
  64   sparc_fpregmap = &sparc32_bsd_fpregmap;
  65
  66   add_inf_child_target (&sparc_nbsd_nat_target);
  67
  68   /* Support debugging kernel virtual memory images.  */
  69   bsd_kvm_add_target (sparc32nbsd_supply_pcb);
  70 }