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/* Restartable Sequences internal API. Linux implementation.
Copyright (C) 2020 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef RSEQ_INTERNAL_H
#define RSEQ_INTERNAL_H
#include <sysdep.h>
#include <errno.h>
#include <kernel-features.h>
#include <stdio.h>
#include <sys/rseq.h>
#ifdef RSEQ_SIG
static inline void
rseq_register_current_thread (void)
{
int ret;
if (__rseq_abi.cpu_id != RSEQ_CPU_ID_UNINITIALIZED)
__libc_fatal ("glibc fatal error: "
"rseq already initialized for this thread\n");
ret = INTERNAL_SYSCALL_CALL (rseq, &__rseq_abi, sizeof (struct rseq),
0, RSEQ_SIG);
if (INTERNAL_SYSCALL_ERROR_P (ret))
{
const char *msg = NULL;
switch (INTERNAL_SYSCALL_ERRNO (ret))
{
case ENOSYS: /* rseq system call not implemented. */
case EPERM: /* rseq system call filtered by seccomp. */
case EACCES: /* rseq system call filtered by seccomp. */
__rseq_abi.cpu_id = RSEQ_CPU_ID_REGISTRATION_FAILED;
break;
case EBUSY:
msg = "glibc fatal error: rseq already registered for this thread\n";
break;
case EFAULT:
msg = "glibc fatal error: rseq parameter is an invalid address\n";
break;
case EINVAL:
msg = "glibc fatal error: rseq parameters are invalid\n";
break;
default:
msg = "glibc fatal error: unexpected rseq errno\n";
break;
}
if (msg != NULL)
__libc_fatal (msg);
}
}
#else /* RSEQ_SIG */
static inline void
rseq_register_current_thread (void)
{
}
#endif /* RSEQ_SIG */
#endif /* rseq-internal.h */
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