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/* Native-dependent code for Alpha BSD's.
Copyright (C) 2000-2019 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 "alpha-bsd-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"
struct alpha_bsd_nat_target final : public inf_ptrace_target
{
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
};
static alpha_bsd_nat_target the_alpha_bsd_nat_target;
/* 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). */
void
alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
{
if (regno == -1 || getregs_supplies (regno))
{
struct reg gregs;
if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
(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 (regcache->arch ()))
{
struct fpreg fpregs;
if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
(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). */
void
alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno)
{
if (regno == -1 || getregs_supplies (regno))
{
struct reg gregs;
if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &gregs, 0) == -1)
perror_with_name (_("Couldn't get registers"));
alphabsd_fill_reg (regcache, (char *) &gregs, regno);
if (ptrace (PT_SETREGS, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &gregs, 0) == -1)
perror_with_name (_("Couldn't write registers"));
if (regno != -1)
return;
}
if (regno == -1
|| regno >= gdbarch_fp0_regnum (regcache->arch ()))
{
struct fpreg fpregs;
if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
(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, regcache->ptid ().pid (),
(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
perror_with_name (_("Couldn't write floating point status"));
}
}
/* Support for debugging kernel virtual memory images. */
#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 (ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
regcache->raw_supply (ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
return 1;
}
void
_initialize_alphabsd_nat (void)
{
add_inf_child_target (&the_alpha_bsd_nat_target);
/* Support debugging kernel virtual memory images. */
bsd_kvm_add_target (alphabsd_supply_pcb);
}
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