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/* Native-dependent code for NetBSD/sparc64.
 
   Copyright (C) 2003, 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
 
   This file is part of GDB.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
#include "defs.h"
#include "gdbcore.h"
#include "regcache.h"
#include "target.h"
 
#include "sparc64-tdep.h"
#include "sparc-nat.h"
 
/* NetBSD is different from the other OSes that support both SPARC and
   UltraSPARC in that the result of ptrace(2) depends on whether the
   traced process is 32-bit or 64-bit.  */
 
static void
sparc64nbsd_supply_gregset (const struct sparc_gregset *gregset,
			    struct regcache *regcache,
			    int regnum, const void *gregs)
{
  int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);
 
  if (sparc32)
    sparc32_supply_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);
  else
    sparc64_supply_gregset (&sparc64nbsd_gregset, regcache, regnum, gregs);
}
 
static void
sparc64nbsd_collect_gregset (const struct sparc_gregset *gregset,
			     const struct regcache *regcache,
			     int regnum, void *gregs)
{
  int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);
 
  if (sparc32)
    sparc32_collect_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);
  else
    sparc64_collect_gregset (&sparc64nbsd_gregset, regcache, regnum, gregs);
}
 
static void
sparc64nbsd_supply_fpregset (struct regcache *regcache,
			     int regnum, const void *fpregs)
{
  int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);
 
  if (sparc32)
    sparc32_supply_fpregset (regcache, regnum, fpregs);
  else
    sparc64_supply_fpregset (regcache, regnum, fpregs);
}
 
static void
sparc64nbsd_collect_fpregset (const struct regcache *regcache,
			      int regnum, void *fpregs)
{
  int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);
 
  if (sparc32)
    sparc32_collect_fpregset (regcache, regnum, fpregs);
  else
    sparc64_collect_fpregset (regcache, regnum, fpregs);
}
 
/* Determine whether `gregset_t' contains register REGNUM.  */
 
static int
sparc64nbsd_gregset_supplies_p (int regnum)
{
  if (gdbarch_ptr_bit (current_gdbarch) == 32)
    return sparc32_gregset_supplies_p (regnum);
 
  /* Integer registers.  */
  if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
      || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
      || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
      || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
    return 1;
 
  /* Control registers.  */
  if (regnum == SPARC64_PC_REGNUM
      || regnum == SPARC64_NPC_REGNUM
      || regnum == SPARC64_STATE_REGNUM
      || regnum == SPARC64_Y_REGNUM)
    return 1;
 
  return 0;
}
 
/* Determine whether `fpregset_t' contains register REGNUM.  */
 
static int
sparc64nbsd_fpregset_supplies_p (int regnum)
{
  if (gdbarch_ptr_bit (current_gdbarch) == 32)
    return sparc32_fpregset_supplies_p (regnum);
 
  /* Floating-point registers.  */
  if ((regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
      || (regnum >= SPARC64_F32_REGNUM && regnum <= SPARC64_F62_REGNUM))
    return 1;
 
  /* Control registers.  */
  if (regnum == SPARC64_FSR_REGNUM)
    return 1;
 
  return 0;
}

 
/* Support for debugging kernel virtual memory images.  */
 
#include <sys/types.h>
#include <machine/pcb.h>
 
#include "bsd-kvm.h"
 
static int
sparc64nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
  u_int64_t state;
  int regnum;
 
  /* The following is true for NetBSD 1.6.2:
 
     The pcb contains %sp and %pc, %psr and %wim.  From this information
     we reconstruct the register state as it would look when we just
     returned from cpu_switch().  */
 
  /* The stack pointer shouldn't be zero.  */
  if (pcb->pcb_sp == 0)
    return 0;
 
  /* If the program counter is zero, this is probably a core dump, and
     we can get %pc from the stack.  */
  if (pcb->pcb_pc == 0)
      read_memory(pcb->pcb_sp + BIAS - 176 + (11 * 8), 
		  (gdb_byte *)&pcb->pcb_pc, sizeof pcb->pcb_pc);
 
 
  regcache_raw_supply (regcache, SPARC_SP_REGNUM, &pcb->pcb_sp);
  regcache_raw_supply (regcache, SPARC64_PC_REGNUM, &pcb->pcb_pc);
 
  state = pcb->pcb_pstate << 8 | pcb->pcb_cwp;
  regcache_raw_supply (regcache, SPARC64_STATE_REGNUM, &state);
 
  sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
 
  return 1;
}
 

/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_sparc64nbsd_nat (void);
 
void
_initialize_sparc64nbsd_nat (void)
{
  sparc_supply_gregset = sparc64nbsd_supply_gregset;
  sparc_collect_gregset = sparc64nbsd_collect_gregset;
  sparc_supply_fpregset = sparc64nbsd_supply_fpregset;
  sparc_collect_fpregset = sparc64nbsd_collect_fpregset;
  sparc_gregset_supplies_p = sparc64nbsd_gregset_supplies_p;
  sparc_fpregset_supplies_p = sparc64nbsd_fpregset_supplies_p;
 
  /* We've got nothing to add to the generic SPARC target.  */
  add_target (sparc_target ());
 
  /* Support debugging kernel virtual memory images.  */
  bsd_kvm_add_target (sparc64nbsd_supply_pcb);
}