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      1 /*	$NetBSD: compat_sigsetjmp.S,v 1.3 2013/11/30 20:54:14 joerg Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Mark Brinicombe
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by Mark Brinicombe
     18  * 4. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <machine/asm.h>
     36 #include <machine/setjmp.h>
     37 
     38 /*
     39  * C library -- sigsetjmp, siglongjmp
     40  *
     41  *	longjmp(a,v)
     42  * will generate a "return(v)" from the last call to
     43  *	setjmp(a, m)
     44  * by restoring registers from the stack.
     45  * The previous signal state is restored.
     46  */
     47 
     48 ENTRY(sigsetjmp)
     49 #if defined(__thumb__) && defined(_ARM_ARCH_T2)
     50 	cbnz	r1, 1f
     51 	b	PLT_SYM(_C_LABEL(_setjmp))
     52 1:	b	PLT_SYM(_C_LABEL(setjmp))
     53 #elif !defined(__thumb__)
     54 	cmp	r1, #0
     55 	beq	PLT_SYM(_C_LABEL(_setjmp))
     56 	b	PLT_SYM(_C_LABEL(setjmp))
     57 #else
     58 	push	{r3, lr}
     59 	beq	1f
     60 	bl	PLT_SYM(_C_LABEL(setjmp))
     61 	pop	{r3, pc}
     62 1:	bl	PLT_SYM(_C_LABEL(_setjmp))
     63 	pop	{r3, pc}
     64 #endif
     65 END(sigsetjmp)
     66 
     67 ENTRY(siglongjmp)
     68 	ldr	r2, .L_setjmp_magic
     69 	ldr	r3, [r0]
     70 	cmp	r2, r3
     71 #if !defined(__thumb__) || defined(_ARM_ARCH_T2)
     72 #if defined(__thumb__)
     73 	it	eq
     74 #endif
     75 	beq	PLT_SYM(_C_LABEL(_longjmp))
     76 	b	PLT_SYM(_C_LABEL(longjmp))
     77 #else
     78 	push	{lr}
     79 	sub	sp, sp, #4
     80 	beq	1f
     81 	bl	PIC_SYM(_C_LABEL(longjmp), PLT)
     82 	b	2f
     83 1:	bl	PIC_SYM(_C_LABEL(_longjmp), PLT)
     84 2:	add	sp, sp, #4
     85 	pop	{pc}
     86 #endif
     87 
     88 	.align	0
     89 .L_setjmp_magic:
     90 	.word	_JB_MAGIC__SETJMP
     91 END(siglongjmp)
     92