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/* Native-dependent code for GNU/Linux on LoongArch processors.
Copyright (C) 2022-2023 Free Software Foundation, Inc.
Contributed by Loongson Ltd.
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 "elf/common.h"
#include "gregset.h"
#include "inferior.h"
#include "linux-nat-trad.h"
#include "loongarch-tdep.h"
#include "nat/gdb_ptrace.h"
#include "target-descriptions.h"
#include <asm/ptrace.h>
/* LoongArch Linux native additions to the default Linux support. */
class loongarch_linux_nat_target final : public linux_nat_trad_target
{
public:
/* Add our register access methods. */
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
protected:
/* Override linux_nat_trad_target methods. */
CORE_ADDR register_u_offset (struct gdbarch *gdbarch, int regnum,
int store_p) override;
};
/* Fill GDB's register array with the general-purpose, orig_a0, pc and badv
register values from the current thread. */
static void
fetch_gregs_from_thread (struct regcache *regcache, int regnum, pid_t tid)
{
elf_gregset_t regset;
if (regnum == -1 || (regnum >= 0 && regnum < 32)
|| regnum == LOONGARCH_ORIG_A0_REGNUM
|| regnum == LOONGARCH_PC_REGNUM
|| regnum == LOONGARCH_BADV_REGNUM)
{
struct iovec iov;
iov.iov_base = ®set;
iov.iov_len = sizeof (regset);
if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, (long) &iov) < 0)
perror_with_name (_("Couldn't get NT_PRSTATUS registers"));
else
loongarch_gregset.supply_regset (nullptr, regcache, -1,
®set, sizeof (regset));
}
}
/* Store to the current thread the valid general-purpose, orig_a0, pc and badv
register values in the GDB's register array. */
static void
store_gregs_to_thread (struct regcache *regcache, int regnum, pid_t tid)
{
elf_gregset_t regset;
if (regnum == -1 || (regnum >= 0 && regnum < 32)
|| regnum == LOONGARCH_ORIG_A0_REGNUM
|| regnum == LOONGARCH_PC_REGNUM
|| regnum == LOONGARCH_BADV_REGNUM)
{
struct iovec iov;
iov.iov_base = ®set;
iov.iov_len = sizeof (regset);
if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, (long) &iov) < 0)
perror_with_name (_("Couldn't get NT_PRSTATUS registers"));
else
{
loongarch_gregset.collect_regset (nullptr, regcache, regnum,
®set, sizeof (regset));
if (ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS, (long) &iov) < 0)
perror_with_name (_("Couldn't set NT_PRSTATUS registers"));
}
}
}
/* Fill GDB's register array with the fp, fcc and fcsr
register values from the current thread. */
static void
fetch_fpregs_from_thread (struct regcache *regcache, int regnum, pid_t tid)
{
elf_fpregset_t regset;
if ((regnum == -1)
|| (regnum >= LOONGARCH_FIRST_FP_REGNUM && regnum <= LOONGARCH_FCSR_REGNUM))
{
struct iovec iovec = { .iov_base = ®set, .iov_len = sizeof (regset) };
if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, (long) &iovec) < 0)
perror_with_name (_("Couldn't get NT_FPREGSET registers"));
else
loongarch_fpregset.supply_regset (nullptr, regcache, -1,
®set, sizeof (regset));
}
}
/* Store to the current thread the valid fp, fcc and fcsr
register values in the GDB's register array. */
static void
store_fpregs_to_thread (struct regcache *regcache, int regnum, pid_t tid)
{
elf_fpregset_t regset;
if ((regnum == -1)
|| (regnum >= LOONGARCH_FIRST_FP_REGNUM && regnum <= LOONGARCH_FCSR_REGNUM))
{
struct iovec iovec = { .iov_base = ®set, .iov_len = sizeof (regset) };
if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, (long) &iovec) < 0)
perror_with_name (_("Couldn't get NT_FPREGSET registers"));
else
{
loongarch_fpregset.collect_regset (nullptr, regcache, regnum,
®set, sizeof (regset));
if (ptrace (PTRACE_SETREGSET, tid, NT_FPREGSET, (long) &iovec) < 0)
perror_with_name (_("Couldn't set NT_FPREGSET registers"));
}
}
}
/* Implement the "fetch_registers" target_ops method. */
void
loongarch_linux_nat_target::fetch_registers (struct regcache *regcache,
int regnum)
{
pid_t tid = get_ptrace_pid (regcache->ptid ());
fetch_gregs_from_thread(regcache, regnum, tid);
fetch_fpregs_from_thread(regcache, regnum, tid);
}
/* Implement the "store_registers" target_ops method. */
void
loongarch_linux_nat_target::store_registers (struct regcache *regcache,
int regnum)
{
pid_t tid = get_ptrace_pid (regcache->ptid ());
store_gregs_to_thread (regcache, regnum, tid);
store_fpregs_to_thread(regcache, regnum, tid);
}
/* Return the address in the core dump or inferior of register REGNO. */
CORE_ADDR
loongarch_linux_nat_target::register_u_offset (struct gdbarch *gdbarch,
int regnum, int store_p)
{
if (regnum >= 0 && regnum < 32)
return regnum;
else if (regnum == LOONGARCH_PC_REGNUM)
return LOONGARCH_PC_REGNUM;
else
return -1;
}
static loongarch_linux_nat_target the_loongarch_linux_nat_target;
/* Wrapper functions. These are only used by libthread_db. */
void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregset)
{
loongarch_gregset.supply_regset (nullptr, regcache, -1, gregset,
sizeof (gdb_gregset_t));
}
void
fill_gregset (const struct regcache *regcache, gdb_gregset_t *gregset,
int regnum)
{
loongarch_gregset.collect_regset (nullptr, regcache, regnum, gregset,
sizeof (gdb_gregset_t));
}
void
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregset)
{
loongarch_fpregset.supply_regset (nullptr, regcache, -1, fpregset,
sizeof (gdb_fpregset_t));
}
void
fill_fpregset (const struct regcache *regcache, gdb_fpregset_t *fpregset,
int regnum)
{
loongarch_fpregset.collect_regset (nullptr, regcache, regnum, fpregset,
sizeof (gdb_fpregset_t));
}
/* Initialize LoongArch Linux native support. */
void _initialize_loongarch_linux_nat ();
void
_initialize_loongarch_linux_nat ()
{
linux_target = &the_loongarch_linux_nat_target;
add_inf_child_target (&the_loongarch_linux_nat_target);
}
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