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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/lib/libc/aarch64/gen/setjmp.S
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/*-

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 * Copyright (c) 2014 Andrew Turner

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 * Copyright (c) 2014 The FreeBSD Foundation

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 *

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 * Portions of this software were developed by Andrew Turner

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 * under sponsorship from the FreeBSD Foundation

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 *

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 */

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#include <machine/asm.h>

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#include <machine/setjmp.h>

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#include <sys/elf_common.h>

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ENTRY(setjmp)

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	sub	sp, sp, #16

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	stp	x0, lr, [sp]

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	/* Store the signal mask */

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	add	x2, x0, #(_JB_SIGMASK * 8)	/* oset */

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	mov	x1, #0				/* set */

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	mov	x0, #1				/* SIG_BLOCK */

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	bl	sigprocmask

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	ldp	x0, lr, [sp]

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	add	sp, sp, #16

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	/* Store the magic value and stack pointer */

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	ldr	x8, .Lmagic

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	mov	x9, sp

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	stp	x8, x9, [x0], #16

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	/* Store the general purpose registers and lr */

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	stp	x19, x20, [x0], #16

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	stp	x21, x22, [x0], #16

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	stp	x23, x24, [x0], #16

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	stp	x25, x26, [x0], #16

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	stp	x27, x28, [x0], #16

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	stp	x29, lr, [x0], #16

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	/* Store the vfp registers */

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	stp	d8, d9, [x0], #16

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	stp	d10, d11, [x0], #16

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	stp	d12, d13, [x0], #16

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	stp	d14, d15, [x0]

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	/* Return value */

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	mov	x0, #0

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	ret

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	.align	3

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.Lmagic:

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	.quad	_JB_MAGIC_SETJMP

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END(setjmp)

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ENTRY(longjmp)

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	sub	sp, sp, #32

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	stp	x0, lr, [sp]

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	str	x1, [sp, #16]

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	/* Restore the signal mask */

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	mov	x2, #0				/* oset */

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	add	x1, x0, #(_JB_SIGMASK * 8)	/* set */

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	mov	x0, #3				/* SIG_SETMASK */

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	bl	sigprocmask

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	ldr	x1, [sp, #16]

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	ldp	x0, lr, [sp]

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	add	sp, sp, #32

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	/* Check the magic value */

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	ldr	x8, [x0], #8

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	ldr	x9, .Lmagic

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	cmp	x8, x9

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	b.ne	botch

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	/* Restore the stack pointer */

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	ldr	x8, [x0], #8

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	mov	sp, x8

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	/* Restore the general purpose registers and lr */

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	ldp	x19, x20, [x0], #16

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	ldp	x21, x22, [x0], #16

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	ldp	x23, x24, [x0], #16

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	ldp	x25, x26, [x0], #16

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	ldp	x27, x28, [x0], #16

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	ldp	x29, lr, [x0], #16

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	/* Restore the vfp registers */

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	ldp	d8, d9, [x0], #16

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	ldp	d10, d11, [x0], #16

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	ldp	d12, d13, [x0], #16

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	ldp	d14, d15, [x0]

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	/* Load the return value */

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	cmp	x1, #0

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	csinc	x0, x1, xzr, ne

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	ret

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botch:

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	bl	_C_LABEL(longjmperror)

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	bl	_C_LABEL(abort)

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END(longjmp)

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GNU_PROPERTY_AARCH64_FEATURE_1_NOTE(GNU_PROPERTY_AARCH64_FEATURE_1_VAL)

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