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/* GNU/Linux/RISC-V native target description support for GDB.
Copyright (C) 2020-2024 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 "gdb_proc_service.h"
#include "arch/riscv.h"
#include "elf/common.h"
#include "nat/gdb_ptrace.h"
#include "nat/riscv-linux-tdesc.h"
#include <sys/uio.h>
/* Work around glibc header breakage causing ELF_NFPREG not to be usable. */
#ifndef NFPREG
# define NFPREG 33
#endif
/* See nat/riscv-linux-tdesc.h. */
struct riscv_gdbarch_features
riscv_linux_read_features (int tid)
{
struct riscv_gdbarch_features features;
elf_fpregset_t regs;
int flen;
/* Figuring out xlen is easy. */
features.xlen = sizeof (elf_greg_t);
/* Start with no f-registers. */
features.flen = 0;
/* How much worth of f-registers can we fetch if any? */
for (flen = sizeof (regs.__f.__f[0]); ; flen *= 2)
{
size_t regset_size;
struct iovec iov;
/* Regsets have a uniform slot size, so we count FSCR like
an FP data register. */
regset_size = ELF_NFPREG * flen;
if (regset_size > sizeof (regs))
break;
iov.iov_base = ®s;
iov.iov_len = regset_size;
if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET,
(PTRACE_TYPE_ARG3) &iov) == -1)
{
switch (errno)
{
case EINVAL:
continue;
case EIO:
break;
default:
perror_with_name (_("Couldn't get registers"));
break;
}
}
else
features.flen = flen;
break;
}
return features;
}
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