gdb/alphabsd-nat.c

/* Native-dependent code for Alpha BSD's.

   Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009
   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 "inferior.h"
#include "regcache.h"

#include "alpha-tdep.h"
#include "alphabsd-tdep.h"
#include "inf-ptrace.h"

#include <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>

#ifdef HAVE_SYS_PROCFS_H
#include <sys/procfs.h>
#endif

#ifndef HAVE_GREGSET_T
typedef struct reg gregset_t;
#endif

#ifndef HAVE_FPREGSET_T 
typedef struct fpreg fpregset_t; 
#endif 

#include "gregset.h"

/* Provide *regset() wrappers around the generic Alpha BSD register
   supply/fill routines.  */

void
supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
{
  alphabsd_supply_reg (regcache, (const char *) gregsetp, -1);
}

void
fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
{
  alphabsd_fill_reg (regcache, (char *) gregsetp, regno);
}

void
supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
{
  alphabsd_supply_fpreg (regcache, (const char *) fpregsetp, -1);
}

void
fill_fpregset (const struct regcache *regcache, fpregset_t *fpregsetp, int regno)
{
  alphabsd_fill_fpreg (regcache, (char *) fpregsetp, regno);
}

/* Determine if PT_GETREGS fetches this register.  */

static int
getregs_supplies (int regno)
{
  return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
	  || regno >= ALPHA_PC_REGNUM);
}

/* Fetch register REGNO from the inferior.  If REGNO is -1, do this
   for all registers (including the floating point registers).  */

static void
alphabsd_fetch_inferior_registers (struct target_ops *ops,
				   struct regcache *regcache, int regno)
{
  if (regno == -1 || getregs_supplies (regno))
    {
      struct reg gregs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
	perror_with_name (_("Couldn't get registers"));

      alphabsd_supply_reg (regcache, (char *) &gregs, regno);
      if (regno != -1)
	return;
    }

  if (regno == -1 || regno >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))
    {
      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating point status"));

      alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
    }
}

/* Store register REGNO back into the inferior.  If REGNO is -1, do
   this for all registers (including the floating point registers).  */

static void
alphabsd_store_inferior_registers (struct target_ops *ops,
				   struct regcache *regcache, int regno)
{
  if (regno == -1 || getregs_supplies (regno))
    {
      struct reg gregs;
      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
                  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
        perror_with_name (_("Couldn't get registers"));

      alphabsd_fill_reg (regcache, (char *) &gregs, regno);

      if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
                  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
        perror_with_name (_("Couldn't write registers"));

      if (regno != -1)
	return;
    }

  if (regno == -1 || regno >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))
    {
      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating point status"));

      alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);

      if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't write floating point status"));
    }
}


/* Support for debugging kernel virtual memory images.  */

#include <sys/types.h>
#include <sys/signal.h>
#include <machine/pcb.h>

#include "bsd-kvm.h"

static int
alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
  int regnum;

  /* The following is true for OpenBSD 3.9:

     The pcb contains the register state at the context switch inside
     cpu_switch().  */

  /* The stack pointer shouldn't be zero.  */
  if (pcb->pcb_hw.apcb_ksp == 0)
    return 0;

  regcache_raw_supply (regcache, ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);

  for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
    regcache_raw_supply (regcache, regnum,
			 &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
  regcache_raw_supply (regcache, ALPHA_RA_REGNUM, &pcb->pcb_context[7]);

  return 1;
}


/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_alphabsd_nat (void);

void
_initialize_alphabsd_nat (void)
{
  struct target_ops *t;

  t = inf_ptrace_target ();
  t->to_fetch_registers = alphabsd_fetch_inferior_registers;
  t->to_store_registers = alphabsd_store_inferior_registers;
  add_target (t);

  /* Support debugging kernel virtual memory images.  */
  bsd_kvm_add_target (alphabsd_supply_pcb);
}