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setjmp.S revision 1.5 
      1 /*	$NetBSD: setjmp.S,v 1.5 2003/04/05 23:08:51 bjh21 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 restored.
     46  */
     47 
     48 ENTRY(setjmp)
     49 	/* Block all signals and retrieve the old signal mask */
     50 	stmfd	sp!, {r0, r14}
     51 	mov	r0, #0x00000000
     52 
     53 	bl	PIC_SYM(_C_LABEL(sigblock), PLT)
     54 	mov	r1, r0
     55 
     56 	ldmfd	sp!, {r0, r14}
     57 
     58 	/* Store signal mask */
     59 	str	r1, [r0, #(25 * 4)]
     60 
     61 	ldr	r1, .Lsetjmp_magic
     62 	str	r1, [r0], #4
     63 
     64 #ifdef SOFTFLOAT
     65 	add	r0, r0, #52
     66 #else
     67 	/* Store fp registers */
     68 	sfm	f4, 4, [r0], #48
     69 	/* Store fpsr */
     70 	rfs	r1
     71 	str	r1, [r0], #0x0004
     72 #endif	/*SOFTFLOAT*/
     73 	/* Store integer registers */
     74         stmia	r0, {r4-r14}
     75         mov	r0, #0x00000000
     76         mov	r15, r14
     77 
     78 .Lsetjmp_magic:
     79 	.word	_JB_MAGIC_SETJMP
     80 
     81 
     82 ENTRY(longjmp)
     83 	ldr	r2, .Lsetjmp_magic
     84 	ldr	r3, [r0]
     85 	teq	r2, r3
     86 	bne	botch
     87 
     88 	/* Fetch signal mask */
     89 	ldr	r2, [r0, #(25 * 4)]
     90 
     91 	/* Set signal mask */
     92 	stmfd	sp!, {r0, r1, r14}
     93 	sub	sp, sp, #4	/* align the stack */
     94 
     95 	mov	r0, r2
     96 	bl	PIC_SYM(_C_LABEL(sigsetmask), PLT)
     97 
     98 	add	sp, sp, #4	/* unalign the stack */
     99 	ldmfd	sp!, {r0, r1, r14}
    100 
    101 	add	r0, r0, #4
    102 #ifdef SOFTFLOAT
    103 	add	r0, r0, #52
    104 #else
    105 	/* Restore fp registers */
    106 	lfm	f4, 4, [r0], #48
    107 	/* Restore FPSR */
    108 	ldr	r4, [r0], #0x0004
    109 	wfs	r4
    110 #endif	/* SOFTFLOAT */
    111 	/* Restore integer registers */
    112         ldmia	r0, {r4-r14}
    113 
    114 	/* Validate sp and r14 */
    115 	teq	sp, #0
    116 	teqne	r14, #0
    117 	beq	botch
    118 
    119 	/* Set return value */
    120 
    121 	mov	r0, r1
    122 	teq	r0, #0x00000000
    123 	moveq	r0, #0x00000001
    124 #ifdef __ARM_26__
    125 	mov	r15, r14
    126 #else
    127 	mov	r15, r14
    128 #endif
    129 
    130 	/* validation failed, die die die. */
    131 botch:
    132 	bl	PIC_SYM(_C_LABEL(longjmperror), PLT)
    133 	bl	PIC_SYM(_C_LABEL(abort), PLT)
    134 	b	. - 8		/* Cannot get here */
    135