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/* $NetBSD: compat_setjmp.S,v 1.5 2020/12/05 11:18:21 skrll 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 <machine/asm.h>
#include <machine/setjmp.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 restored.
*/
ENTRY(setjmp)
/* Block all signals and retrieve the old signal mask */
push {r0, lr}
movs r0, #0x00000000
bl PLT_SYM(_C_LABEL(sigblock))
mov r1, r0
/* Store signal mask */
str r1, [r0, #(_JB_SIGMASK * 4)]
ldr r1, .Lsetjmp_magic
str r1, [r0]
/* Store integer registers */
adds r0, r0, #(_JB_REG_R4 * 4)
#ifdef __thumb__
#ifdef _ARM_ARCH_7
stmia r0!, {r4-r12}
str sp, [r0, #0]
str lr, [r0, #4]
#else
stmia r0!, {r4-r7}
mov r2, r8
mov r3, r9
stmia r0!, {r2-r3}
mov r1, r10
mov r2, r11
mov r3, r12
stmia r0!, {r1-r3}
mov r2, sp
mov r3, lr
stmia r0!, {r2-r3}
#endif
#else
stmia r0, {r4-lr}
#endif
movs r0, #0
pop {r3, pc}
END(setjmp)
ENTRY(longjmp)
ldr r2, .Lsetjmp_magic
ldr r3, [r0]
cmp r2, r3
bne botch
/* Fetch signal mask */
ldr r2, [r0, #(_JB_SIGMASK * 4)]
/* Set signal mask */
push {r0, r1} /* don't care about lr */
mov r0, r2
bl PLT_SYM(_C_LABEL(sigsetmask))
pop {r0, r1}
/* Restore integer registers */
adds r0, r0, #(_JB_REG_R4 * 4)
#if !defined(__thumb__) || defined(_ARM_ARCH_7)
ldmia r0!, {r4-r12}
#else
ldmia r0!, {r4-r7}
ldmia r0!, {r2-r3}
mov r8, r2
mov r9, r3
ldmia r0!, {r1-r3}
mov r10, r2
mov r11, r3
ldmia r0!, {r2}
mov r12, r2
#endif
ldmia r0!, {r2-r3} /* r2 = sp, r3 = lr */
/* Validate sp */
cmp r2, #0
beq botch
mov sp, r2
/* Validate lr */
cmp r3, #0
beq botch
mov lr, r3
/* Set return value */
mov r0, r1
cmp r0, #0
#ifdef __thumb__
bne 1f
movs r0, #1
1:
#else
moveq r0, #1
#endif
RET
/* validation failed, die die die. */
botch:
bl PLT_SYM(_C_LABEL(longjmperror))
bl PLT_SYM(_C_LABEL(abort))
2: b 2b /* Cannot get here */
.align 0
.Lsetjmp_magic:
.word _JB_MAGIC_SETJMP
END(longjmp)
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