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lib/libc/gen/rseq_abi.c
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/*- | |||||
* Copyright (c) 2021 The FreeBSD Foundation | |||||
* | |||||
* This software were developed by Konstantin Belousov <kib@FreeBSD.org> | |||||
* under sponsorship from the FreeBSD Foundation. | |||||
* | |||||
* Redistribution and use in source and binary forms, with or without | |||||
* modification, are permitted provided that the following conditions | |||||
* are met: | |||||
* 1. Redistributions of source code must retain the above copyright | |||||
* notice, this list of conditions and the following disclaimer. | |||||
* 2. Redistributions in binary form must reproduce the above copyright | |||||
* notice, this list of conditions and the following disclaimer in the | |||||
* documentation and/or other materials provided with the distribution. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
* SUCH DAMAGE. | |||||
*/ | |||||
#include <sys/types.h> | |||||
#include <sys/auxv.h> | |||||
#include <sys/rseq.h> | |||||
#include <sched.h> | |||||
#include "libc_private.h" | |||||
_Thread_local volatile struct rseq __rseq_abi __weak_symbol; | |||||
static void __main_rseq_abi_init(void) __attribute__((__constructor__, | |||||
__used__)); | |||||
static void | |||||
__main_rseq_abi_init(void) | |||||
{ | |||||
__rseq_abi_init(); | |||||
} | |||||
void | |||||
__rseq_abi_init(void) | |||||
{ | |||||
int bsdflags; | |||||
if (_elf_aux_info(AT_BSDFLAGS, &bsdflags, sizeof(bsdflags)) != 0 || | |||||
(bsdflags & ELF_BSDF_RSEQ1) == 0) | |||||
return; | |||||
__rseq_abi.cpu_id_start = sched_getcpu(); | |||||
rseq(&__rseq_abi, sizeof(__rseq_abi), 0, 0/* XXXKIB */); | |||||
} |