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/* Native-dependent code for GNU/Linux OpenRISC.
Copyright (C) 2021-2024 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 "gregset.h"
#include "linux-nat.h"
#include "or1k-tdep.h"
#include "or1k-linux-tdep.h"
#include "inferior.h"
#include "elf/common.h"
#include <sys/ptrace.h>
/* OpenRISC Linux native additions to the default linux support. */
class or1k_linux_nat_target final : public linux_nat_target
{
public:
/* Add our register access methods. */
void fetch_registers (struct regcache *regcache, int regnum) override;
void store_registers (struct regcache *regcache, int regnum) override;
/* Read suitable target description. */
const struct target_desc *read_description () override;
};
static or1k_linux_nat_target the_or1k_linux_nat_target;
/* Copy general purpose register REGNUM (or all gp regs if REGNUM == -1)
from regset GREGS into REGCACHE. */
static void
supply_gregset_regnum (struct regcache *regcache, const prgregset_t *gregs,
int regnum)
{
int i;
const elf_greg_t *regp = *gregs;
/* Access all registers */
if (regnum == -1)
{
/* We fill the general purpose registers. */
for (i = OR1K_ZERO_REGNUM + 1; i < OR1K_MAX_GPR_REGS; i++)
regcache->raw_supply (i, regp + i);
/* Supply OR1K_NPC_REGNUM from index 32. */
regcache->raw_supply (OR1K_NPC_REGNUM, regp + 32);
/* Fill the inaccessible zero register with zero. */
regcache->raw_supply_zeroed (0);
}
else if (regnum == OR1K_ZERO_REGNUM)
regcache->raw_supply_zeroed (0);
else if (regnum == OR1K_NPC_REGNUM)
regcache->raw_supply (OR1K_NPC_REGNUM, regp + 32);
else if (regnum > OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS)
regcache->raw_supply (regnum, regp + regnum);
}
/* Copy all general purpose registers from regset GREGS into REGCACHE. */
void
supply_gregset (struct regcache *regcache, const prgregset_t *gregs)
{
supply_gregset_regnum (regcache, gregs, -1);
}
/* Copy general purpose register REGNUM (or all gp regs if REGNUM == -1)
from REGCACHE into regset GREGS. */
void
fill_gregset (const struct regcache *regcache, prgregset_t *gregs, int regnum)
{
elf_greg_t *regp = *gregs;
if (regnum == -1)
{
/* We fill the general purpose registers. */
for (int i = OR1K_ZERO_REGNUM + 1; i < OR1K_MAX_GPR_REGS; i++)
regcache->raw_collect (i, regp + i);
regcache->raw_collect (OR1K_NPC_REGNUM, regp + 32);
}
else if (regnum == OR1K_ZERO_REGNUM)
/* Nothing to do here. */
;
else if (regnum > OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS)
regcache->raw_collect (regnum, regp + regnum);
else if (regnum == OR1K_NPC_REGNUM)
regcache->raw_collect (OR1K_NPC_REGNUM, regp + 32);
}
/* Transfering floating-point registers between GDB, inferiors and cores.
Since OpenRISC floating-point registers are the same as GPRs these do
nothing. */
void
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs)
{
}
void
fill_fpregset (const struct regcache *regcache,
gdb_fpregset_t *fpregs, int regno)
{
}
/* Return a target description for the current target. */
const struct target_desc *
or1k_linux_nat_target::read_description ()
{
return tdesc_or1k_linux;
}
/* Fetch REGNUM (or all registers if REGNUM == -1) from the target
into REGCACHE using PTRACE_GETREGSET. */
void
or1k_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum)
{
int tid;
tid = get_ptrace_pid (regcache->ptid());
if ((regnum >= OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS)
|| (regnum == OR1K_NPC_REGNUM)
|| (regnum == -1))
{
struct iovec iov;
elf_gregset_t regs;
iov.iov_base = ®s;
iov.iov_len = sizeof (regs);
if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS,
(PTRACE_TYPE_ARG3) &iov) == -1)
perror_with_name (_("Couldn't get registers"));
else
supply_gregset_regnum (regcache, ®s, regnum);
}
/* Access to other SPRs has potential security issues, don't support them for
now. */
}
/* Store REGNUM (or all registers if REGNUM == -1) to the target
from REGCACHE using PTRACE_SETREGSET. */
void
or1k_linux_nat_target::store_registers (struct regcache *regcache, int regnum)
{
int tid;
tid = get_ptrace_pid (regcache->ptid ());
if ((regnum >= OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS)
|| (regnum == OR1K_NPC_REGNUM)
|| (regnum == -1))
{
struct iovec iov;
elf_gregset_t regs;
iov.iov_base = ®s;
iov.iov_len = sizeof (regs);
if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS,
(PTRACE_TYPE_ARG3) &iov) == -1)
perror_with_name (_("Couldn't get registers"));
else
{
fill_gregset (regcache, ®s, regnum);
if (ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS,
(PTRACE_TYPE_ARG3) &iov) == -1)
perror_with_name (_("Couldn't set registers"));
}
}
/* Access to SPRs has potential security issues, don't support them for
now. */
}
/* Initialize OpenRISC Linux native support. */
void _initialize_or1k_linux_nat ();
void
_initialize_or1k_linux_nat ()
{
/* Register the target. */
linux_target = &the_or1k_linux_nat_target;
add_inf_child_target (&the_or1k_linux_nat_target);
}
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