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/* $OpenBSD: setjmp.S,v 1.7 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 "SYS.h"
#include <machine/setjmp.h>
.hidden __jmpxor
/*
* 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 restored.
*/
ENTRY(setjmp)
/* Block all signals and retrieve the old signal mask */
mov r2, r0
mov r1, #0x00000000
mov r0, #0x00000001 /* SIG_BLOCK */
SYSTRAP(sigprocmask)
/* Store signal mask */
str r0, [r2, #(29 * 4)]
ldr r1, .Lsetjmp_magic
str r1, [r2], #4
ldr r12, .L_jmpxor_setjmp
1: add r12, pc, r12 /* r12 = &__jmpxor */
ldr r3, [r12], #4 /* r3 = __jmpxor[1] */
ldr r12, [r12] /* r12 = __jmpxor[0] */
eor r12, r13, r12 /* r12 = sp ^ __jmpxor[0] */
eor r3, lr, r3 /* r3 = lr ^ __jmpxor[1] */
#ifdef SOFTFLOAT
add r2, r2, #68
#else
/* Store fpcsr */
vmrs r1, fpscr
str r1, [r2], #4
/* Store fp registers */
vstmia r2!, {d8-d15}
#endif /* SOFTFLOAT */
/* Store integer registers */
stmia r2, {r3-r12}
mov r0, #0x00000000
mov r12, r0 /* overwrite __jmpxor copies */
mov r3, r0
mov pc, lr
.Lsetjmp_magic:
.word _JB_MAGIC_SETJMP
.L_jmpxor_setjmp:
.word __jmpxor - 1b
END_STRONG(setjmp)
ENTRY(longjmp)
ldr r2, .Lsetjmp_magic
ldr r3, [r0]
teq r2, r3
bne botch
/* Fetch signal mask and call sigprocmask */
mov r3, r0 /* r3 = jmpbuf */
mov r2, r1 /* r2 = retvalue */
ldr r1, [r0, #(29 * 4)]
mov r0, #0x00000003 /* SIG_SETMASK */
SYSTRAP(sigprocmask)
add r3, r3, #4
#ifdef SOFTFLOAT
add r3, r3, #68
#else
/* Restore fpcsr */
ldr r4, [r3], #4
vmsr fpscr, r4
/* Restore fp registers */
vldmia r3!, {d8-d15}
#endif /* SOFTFLOAT */
/* Restore integer registers */
ldmia r3, {r3-r12}
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, r12 /* sp = __jmpxor[0] ^ jmpbuf[SP] */
mov r12, r2 /* overwrite __jmpxor copies */
mov r3, r2
/* Validate sp and lr */
teq sp, #0
teqne lr, #0
beq botch
/* Set return value */
mov r0, r12
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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