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_setjmp.S revision 1.6 
      1 /*	$NetBSD: _setjmp.S,v 1.6 2004/08/21 11:20:10 rearnsha 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 -- _setjmp, _longjmp
     40  *
     41  *	_longjmp(a,v)
     42  * will generate a "return(v)" from the last call to
     43  *	_setjmp(a)
     44  * by restoring registers from the stack.
     45  * The previous signal state is NOT restored.
     46  *
     47  * Note: r0 is the return value
     48  *       r1-r3 are scratch registers in functions
     49  */
     50 
     51 ENTRY(_setjmp)
     52 	ldr	r1, .L_setjmp_magic
     53 	str	r1, [r0], #4
     54 #ifdef SOFTFLOAT
     55 	add	r0, r0, #52
     56 #else
     57 	/* Store fp registers */
     58 	sfm	f4, 4, [r0], #48
     59 	/* Store fpsr */
     60 	rfs	r1
     61 	str	r1, [r0], #0x0004
     62 #endif	/* SOFTFLOAT */
     63 	/* Store integer registers */
     64         stmia	r0, {r4-r14}
     65 
     66         mov	r0, #0x00000000
     67         RET
     68 
     69 .L_setjmp_magic:
     70 	.word	_JB_MAGIC__SETJMP
     71 
     72 ENTRY(_longjmp)
     73 	ldr	r2, .L_setjmp_magic
     74 	ldr	r3, [r0], #4
     75 	teq	r2, r3
     76 	bne	botch
     77 
     78 #ifdef SOFTFLOAT
     79 	add	r0, r0, #52
     80 #else
     81 	/* Restore fp registers */
     82 	lfm	f4, 4, [r0], #48
     83 	/* Restore fpsr */
     84 	ldr	r4, [r0], #0x0004
     85 	wfs	r4
     86 #endif	/* SOFTFLOAT */
     87        	/* Restore integer registers */
     88         ldmia	r0, {r4-r14}
     89 
     90 	/* Validate sp and r14 */
     91 	teq	sp, #0
     92 	teqne	r14, #0
     93 	beq	botch
     94 
     95 	/* Set return value */
     96 	mov	r0, r1
     97 	teq	r0, #0x00000000
     98 	moveq	r0, #0x00000001
     99 	RET
    100 
    101 	/* validation failed, die die die. */
    102 botch:
    103 	bl	PIC_SYM(_C_LABEL(longjmperror), PLT)
    104 	bl	PIC_SYM(_C_LABEL(abort), PLT)
    105 	b	. - 8		/* Cannot get here */
    106