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/* $NetBSD: _setjmp.S,v 1.1 2014/08/10 05:47:36 matt Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <machine/asm.h>
#include "assym.h"
/*
* C library -- _setjmp, _longjmp
*
* _longjmp(a, v)
* will generate a "return v;" from the last call to
* _setjmp(a)
* by restoring registers from the stack.
* The previous signal state is NOT restored.
*
* Note: x0 is the return value
*/
.section .rodata.cst8,"aM",@progbits,8
.align 3
.L_MAGIC:
.xword _JB_MAGIC_AARCH64__SETJMP
ENTRY(_setjmp)
adrp x7, .L_MAGIC
ldr x7, [x7, #:lo12:.L_MAGIC]
mov x3, sp
stp x7, x3, [x0, #_JB_MAGIC]
stp x19, x20, [x0, #_JB_X19]
stp x21, x22, [x0, #_JB_X21]
stp x23, x24, [x0, #_JB_X23]
stp x25, x26, [x0, #_JB_X25]
stp x27, x28, [x0, #_JB_X27]
stp x29, x30, [x0, #_JB_X29]
mrs x5, tpidr_el0
str x5, [x0, #_JB_TPIDR]
stp d8, d9, [x0, #_JB_D8]
stp d10, d11, [x0, #_JB_D10]
stp d12, d13, [x0, #_JB_D12]
stp d14, d15, [x0, #_JB_D14]
mov x0, xzr
ret
END(_setjmp)
ENTRY(_longjmp)
adrp x7, .L_MAGIC
ldr x7, [x7, #:lo12:.L_MAGIC]
ldp x2, x3, [x0, #_JB_MAGIC]
ldp x4, x5, [x0, #_JB_X29]
cbz x3, .Lbotch
cbz x4, .Lbotch
cbz x5, .Lbotch
cmp x2, x7
b.ne .Lbotch
ldp x19, x20, [x0, #_JB_X19]
ldp x21, x22, [x0, #_JB_X21]
ldp x23, x24, [x0, #_JB_X23]
ldp x25, x26, [x0, #_JB_X25]
ldp x27, x28, [x0, #_JB_X27]
ldr x5, [x0, #_JB_TPIDR]
msr tpidr_el0, x5
ldp d8, d9, [x0, #_JB_D8]
ldp d10, d11, [x0, #_JB_D10]
ldp d12, d13, [x0, #_JB_D12]
ldp d14, d15, [x0, #_JB_D14]
mov sp, x3
mov x29, x4
mov x30, x5
mov x0, x1
ret
/* validation failed, die die die. */
.Lbotch:
bl _C_LABEL(longjmperror)
bl _C_LABEL(abort)
1: b 1b /* Cannot get here */
END(_longjmp)
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