lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-30 22:43:12 +03:00
Code Activity

Linux: Remove rseq support

Browse Source 
The kernel ABI is not finalized, and there are now various proposals
to change the size of struct rseq, which would make the glibc ABI
dependent on the version of the kernels used for building glibc.
This is of course not acceptable.

This reverts commit 48699da1c4 ("elf:
Support at least 32-byte alignment in static dlopen"), commit
8f4632deb3 ("Linux: rseq registration
tests"), commit 6e29cb3f61 ("Linux: Use
rseq in sched_getcpu if available"), and commit
0c76fc3c2b ("Linux: Perform rseq
registration at C startup and thread creation"), resolving the conflicts
introduced by the ARC port and the TLS static surplus changes.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2020-07-16 17:55:35 +02:00
parent da7d62b503
commit efedd1ed3d
54 changed files with 6 additions and 1197 deletions
Download Patch File Download Diff File Expand all files Collapse all files

73
sysdeps/unix/sysv/linux/rseq-internal.h
View File

@ -1,73 +0,0 @@
/* 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 */