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libc/aarch64: Copy the trivial getcontextx

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This will be used as the base of a non-trivial implementation.

Reviewed by:	kib
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D44254

(cherry picked from commit fd6b1cc34e)
This commit is contained in:
Andrew Turner 2024-02-28 16:09:17 +00:00
parent 254d54f073
commit fd443b71fa
2 changed files with 75 additions and 2 deletions
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4
lib/libc/aarch64/gen/Makefile.inc
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@ -6,10 +6,10 @@ SRCS+= _ctx_start.S \
flt_rounds.c \
fpgetmask.c \
fpsetmask.c \
getcontextx.c \
infinity.c \
ldexp.c \
makecontext.c \
_setjmp.S \
setjmp.S \
sigsetjmp.S \
trivial-getcontextx.c
sigsetjmp.S

73
lib/libc/aarch64/gen/getcontextx.c Normal file
View file

@ -0,0 +1,73 @@
/*
* Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
* All rights reserved.
*
* 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 ``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 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/ucontext.h>
#include <errno.h>
#include <stdlib.h>
int
__getcontextx_size(void)
{
return (sizeof(ucontext_t));
}
int
__fillcontextx2(char *ctx)
{
return (0);
}
int
__fillcontextx(char *ctx)
{
ucontext_t *ucp;
ucp = (ucontext_t *)ctx;
return (getcontext(ucp));
}
__weak_reference(__getcontextx, getcontextx);
ucontext_t *
__getcontextx(void)
{
char *ctx;
int error;
ctx = malloc(__getcontextx_size());
if (ctx == NULL)
return (NULL);
if (__fillcontextx(ctx) == -1) {
error = errno;
free(ctx);
errno = error;
return (NULL);
}
return ((ucontext_t *)ctx);
}