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/* Native-dependent code for FreeBSD/arm.
Copyright (C) 2017-2018 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 "target.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include "fbsd-nat.h"
#include "arm-tdep.h"
#include "arm-fbsd-tdep.h"
#include "inf-ptrace.h"
struct arm_fbsd_nat_target : public fbsd_nat_target
{
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
const struct target_desc *read_description () override;
};
static arm_fbsd_nat_target the_arm_fbsd_nat_target;
/* Determine if PT_GETREGS fetches REGNUM. */
static bool
getregs_supplies (struct gdbarch *gdbarch, int regnum)
{
return ((regnum >= ARM_A1_REGNUM && regnum <= ARM_PC_REGNUM)
|| regnum == ARM_PS_REGNUM);
}
#ifdef PT_GETVFPREGS
/* Determine if PT_GETVFPREGS fetches REGNUM. */
static bool
getvfpregs_supplies (struct gdbarch *gdbarch, int regnum)
{
return ((regnum >= ARM_D0_REGNUM && regnum <= ARM_D31_REGNUM)
|| regnum == ARM_FPSCR_REGNUM);
}
#endif
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
for all registers. */
void
arm_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
{
pid_t pid = get_ptrace_pid (regcache->ptid ());
struct gdbarch *gdbarch = regcache->arch ();
if (regnum == -1 || getregs_supplies (gdbarch, regnum))
{
struct reg regs;
if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't get registers"));
regcache->supply_regset (&arm_fbsd_gregset, regnum, ®s,
sizeof (regs));
}
#ifdef PT_GETVFPREGS
if (regnum == -1 || getvfpregs_supplies (gdbarch, regnum))
{
struct vfpreg vfpregs;
if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
perror_with_name (_("Couldn't get floating point status"));
regcache->supply_regset (&arm_fbsd_vfpregset, regnum, &vfpregs,
sizeof (vfpregs));
}
#endif
}
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
this for all registers. */
void
arm_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
{
pid_t pid = get_ptrace_pid (regcache->ptid ());
struct gdbarch *gdbarch = regcache->arch ();
if (regnum == -1 || getregs_supplies (gdbarch, regnum))
{
struct reg regs;
if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't get registers"));
regcache->collect_regset (&arm_fbsd_gregset, regnum, ®s,
sizeof (regs));
if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't write registers"));
}
#ifdef PT_GETVFPREGS
if (regnum == -1 || getvfpregs_supplies (gdbarch, regnum))
{
struct vfpreg vfpregs;
if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
perror_with_name (_("Couldn't get floating point status"));
regcache->collect_regset (&arm_fbsd_vfpregset, regnum, &vfpregs,
sizeof (vfpregs));
if (ptrace (PT_SETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
perror_with_name (_("Couldn't write floating point status"));
}
#endif
}
/* Implement the to_read_description method. */
const struct target_desc *
arm_fbsd_nat_target::read_description ()
{
const struct target_desc *desc;
desc = arm_fbsd_read_description_auxv (this);
if (desc == NULL)
desc = this->beneath ()->read_description ();
return desc;
}
void
_initialize_arm_fbsd_nat (void)
{
add_inf_child_target (&the_arm_fbsd_nat_target);
}
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