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/* $OpenBSD: _setjmp.S,v 1.6 2018/06/22 15:18:50 kettenis Exp $ */
/* $NetBSD: _setjmp.S,v 1.5 2003/04/05 23:08:51 bjh21 Exp $ */
/*
* Copyright (c) 1997 Mark Brinicombe
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Mark Brinicombe
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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 "DEFS.h"
#include <machine/setjmp.h>
.section .openbsd.randomdata,"aw",%progbits
.align 4
.globl __jmpxor
__jmpxor:
.zero 4*2 /* (sp, lr) */
END(__jmpxor)
.type __jmpxor,%object
/*
* 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: r0 is the return value
* r1-r3 are scratch registers in functions
*/
ENTRY(_setjmp)
ldr r1, .L_setjmp_magic
str r1, [r0], #4
ldr r2, .L_jmpxor_setjmp
1: add r2, pc, r2 /* r2 = &__jmpxor */
ldr r3, [r2], #4 /* r3 = __jmpxor[1] */
ldr r2, [r2] /* r2 = __jmpxor[0] */
eor r2, r13, r2 /* r2 = sp ^ __jmpxor[0] */
eor r3, lr, r3 /* r3 = lr ^ __jmpxor[1] */
#ifdef SOFTFLOAT
add r0, r0, #68
#else
/* Store fpcsr */
vmrs r1, fpscr
str r1, [r0], #4
/* Store fp registers */
vstmia r0!, {d8-d15}
#endif /* SOFTFLOAT */
/* Store integer registers */
stmia r0, {r2-r11}
mov r0, #0x00000000
mov r2, r0 /* overwrite __jmpxor copies */
mov r3, r0
mov pc, lr
.L_setjmp_magic:
.word _JB_MAGIC__SETJMP
.L_jmpxor_setjmp:
.word __jmpxor - 1b
END_STRONG(_setjmp)
ENTRY(_longjmp)
ldr r2, .L_setjmp_magic
ldr r3, [r0], #4
teq r2, r3
bne botch
#ifdef SOFTFLOAT
add r0, r0, #68
#else
/* Restore fpcsr */
ldr r4, [r0], #4
vmsr fpscr, r4
/* Restore fp registers */
vldmia r0!, {d8-d15}
#endif /* SOFTFLOAT */
/* Restore integer registers */
ldmia r0, {r2-r11}
ldr r0, .L_jmpxor_longjmp
1: add r0, pc, r0 /* r0 = &__jmpxor */
ldr lr, [r0], #4 /* lr = __jmpxor[1] */
eor lr, r3, lr /* lr ^= jmpbuf[LR] */
ldr r0, [r0] /* r0 = __jmpxor[0] */
eor r13, r0, r2 /* sp = __jmpxor[0] ^ jmpbuf[SP] */
mov r2, r1 /* overwrite __jmpxor copies */
mov r3, r1
/* Validate sp and lr */
teq sp, #0
teqne lr, #0
beq botch
/* Set return value */
mov r0, r1
teq r0, #0x00000000
moveq r0, #0x00000001
mov pc, lr
.L_jmpxor_longjmp:
.word __jmpxor - 1b
/* validation failed, die die die. */
botch:
bl _HIDDEN(abort)
b . - 8 /* Cannot get here */
END_STRONG(_longjmp)
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