Home | History | Annotate | Line # | Download | only in gen
setjmp.S revision 1.8.44.1 
      1 /*	$NetBSD: setjmp.S,v 1.8.44.1 2012/10/30 18:58:39 yamt 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(__setjmp14)
     49 	/* Get the signal mask. */
     50 	stmfd	sp!, {r0-r2, r14}
     51 	add	r2, r0, #(_JB_SIGMASK * 4)
     52 	mov	r1, #0x00000000
     53 	mov	r0, #0x00000000
     54 	bl	PIC_SYM(_C_LABEL(__sigprocmask14), PLT)
     55 	ldmfd	sp!, {r0-r2, r14}
     56 
     57 	ldr	r1, .Lsetjmp_magic
     58 	str	r1, [r0], #4
     59 
     60 #ifdef SOFTFLOAT
     61 	add	r0, r0, #52
     62 #elif defined(__VFP_FP__)
     63 #error __setjmp14 VFP support missing
     64 #else
     65 	/* Store fp registers */
     66 	sfm	f4, 4, [r0], #48
     67 	/* Store fpsr */
     68 	rfs	r1
     69 	str	r1, [r0], #0x0004
     70 #endif	/*SOFTFLOAT*/
     71 	/* Store integer registers */
     72         stmia	r0, {r4-r14}
     73         mov	r0, #0x00000000
     74         RET
     75 
     76 .Lsetjmp_magic:
     77 	.word	_JB_MAGIC_SETJMP
     78 
     79 
     80 ENTRY(__longjmp14)
     81 	ldr	r2, .Lsetjmp_magic
     82 	ldr	r3, [r0]
     83 	teq	r2, r3
     84 	bne	.Lbotch
     85 
     86 	/* Restore the signal mask. */
     87 	stmfd	sp!, {r0-r2, r14}
     88 	mov	r2, #0x00000000
     89 	add	r1, r0, #(_JB_SIGMASK * 4)
     90 	mov	r0, #3				/* SIG_SETMASK */
     91 	bl	PIC_SYM(_C_LABEL(__sigprocmask14), PLT)
     92 	ldmfd	sp!, {r0-r2, r14}
     93 
     94 	add	r0, r0, #4
     95 #ifdef SOFTFLOAT
     96 	add	r0, r0, #52
     97 #elif defined(__VFP_FP__)
     98 #error __longjmp14 VFP support missing
     99 #else
    100 	/* Restore fp registers */
    101 	lfm	f4, 4, [r0], #48
    102 	/* Restore FPSR */
    103 	ldr	r4, [r0], #0x0004
    104 	wfs	r4
    105 #endif	/* SOFTFLOAT */
    106 	/* Restore integer registers */
    107         ldmia	r0, {r4-r14}
    108 
    109 	/* Validate sp and r14 */
    110 	teq	sp, #0
    111 	teqne	r14, #0
    112 	beq	.Lbotch
    113 
    114 	/* Set return value */
    115 
    116 	mov	r0, r1
    117 	teq	r0, #0x00000000
    118 	moveq	r0, #0x00000001
    119 	RET
    120 
    121 	/* validation failed, die die die. */
    122 .Lbotch:
    123 	bl	PIC_SYM(_C_LABEL(longjmperror), PLT)
    124 	bl	PIC_SYM(_C_LABEL(abort), PLT)
    125 	b	. - 8		/* Cannot get here */
    126