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/* Native-dependent code for FreeBSD/riscv.
Copyright (C) 2018-2021 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 "regcache.h"
#include "target.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include "fbsd-nat.h"
#include "riscv-tdep.h"
#include "riscv-fbsd-tdep.h"
#include "inf-ptrace.h"
struct riscv_fbsd_nat_target final : public fbsd_nat_target
{
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
};
static riscv_fbsd_nat_target the_riscv_fbsd_nat_target;
/* Determine if PT_GETREGS fetches REGNUM. */
static bool
getregs_supplies (int regnum)
{
return ((regnum >= RISCV_RA_REGNUM && regnum <= RISCV_PC_REGNUM)
|| regnum == RISCV_CSR_SSTATUS_REGNUM);
}
/* Determine if PT_GETFPREGS fetches REGNUM. */
static bool
getfpregs_supplies (int regnum)
{
return ((regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM)
|| regnum == RISCV_CSR_FCSR_REGNUM);
}
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
for all registers. */
void
riscv_fbsd_nat_target::fetch_registers (struct regcache *regcache,
int regnum)
{
pid_t pid = get_ptrace_pid (regcache->ptid ());
if (regnum == -1 || regnum == RISCV_ZERO_REGNUM)
regcache->raw_supply_zeroed (RISCV_ZERO_REGNUM);
if (regnum == -1 || getregs_supplies (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 (&riscv_fbsd_gregset, regnum, ®s,
sizeof (regs));
}
if (regnum == -1 || getfpregs_supplies (regnum))
{
struct fpreg fpregs;
if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
perror_with_name (_("Couldn't get floating point status"));
regcache->supply_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
sizeof (fpregs));
}
}
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
this for all registers. */
void
riscv_fbsd_nat_target::store_registers (struct regcache *regcache,
int regnum)
{
pid_t pid = get_ptrace_pid (regcache->ptid ());
if (regnum == -1 || getregs_supplies (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 (&riscv_fbsd_gregset, regnum, ®s,
sizeof (regs));
if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't write registers"));
}
if (regnum == -1 || getfpregs_supplies (regnum))
{
struct fpreg fpregs;
if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
perror_with_name (_("Couldn't get floating point status"));
regcache->collect_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
sizeof (fpregs));
if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
perror_with_name (_("Couldn't write floating point status"));
}
}
void _initialize_riscv_fbsd_nat ();
void
_initialize_riscv_fbsd_nat ()
{
add_inf_child_target (&the_riscv_fbsd_nat_target);
}
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