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setjmp.S revision 1.10 
      1 /*	$NetBSD: setjmp.S,v 1.10 2013/01/11 13:55:25 matt 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 #if !defined(__SOFTFP__) && !defined(__VFP_FP__)
     36 #error FPA is not supported anymore
     37 #endif
     38 
     39 #include <machine/asm.h>
     40 #include <machine/setjmp.h>
     41 
     42 /*
     43  * C library -- setjmp, longjmp
     44  *
     45  *	longjmp(a,v)
     46  * will generate a "return(v)" from the last call to
     47  *	setjmp(a)
     48  * by restoring registers from the stack.
     49  * The previous signal state is restored.
     50  */
     51 
     52 ENTRY(__setjmp14)
     53 	/* Get the signal mask. */
     54 	stmfd	sp!, {r0-r2, r14}
     55 	add	r2, r0, #(_JB_SIGMASK * 4)
     56 	mov	r1, #0x00000000
     57 	mov	r0, #0x00000000
     58 	bl	PIC_SYM(_C_LABEL(__sigprocmask14), PLT)
     59 	ldmfd	sp!, {r0-r2, r14}
     60 
     61 	ldr	r1, .Lsetjmp_magic
     62 	str	r1, [r0]
     63 
     64 #ifndef __SOFTFP__
     65 	add	r1, r0, #(_JB_REG_D8 * 4)
     66 	vstmia	r1, {d8-d15}
     67 	vmrs	r1, fpscr
     68 	str	r1, [r0, #(_JB_REG_FPSCR * 4)]
     69 #endif /* !__SOFTFP__ */
     70 
     71 	/* Store integer registers */
     72 	add	r0, r0, #(_JB_REG_R4 * 4)
     73         stmia	r0, {r4-r14}
     74         mov	r0, #0x00000000
     75         RET
     76 
     77 .Lsetjmp_magic:
     78 #ifdef __SOFTFP__
     79 	.word	_JB_MAGIC_SETJMP
     80 #else
     81 	.word	_JB_MAGIC_SETJMP_VFP
     82 #endif
     83 
     84 
     85 ENTRY(__longjmp14)
     86 	ldr	r2, .Lsetjmp_magic
     87 	ldr	r3, [r0]
     88 	teq	r2, r3
     89 	bne	.Lbotch
     90 
     91 	/* Restore the signal mask. */
     92 	stmfd	sp!, {r0-r2, r14}
     93 	mov	r2, #0x00000000
     94 	add	r1, r0, #(_JB_SIGMASK * 4)
     95 	mov	r0, #3				/* SIG_SETMASK */
     96 	bl	PIC_SYM(_C_LABEL(__sigprocmask14), PLT)
     97 	ldmfd	sp!, {r0-r2, r14}
     98 
     99 #ifndef __SOFTFP__
    100 	add	r1, r0, #(_JB_REG_D8 * 4)
    101 	vldmia	r1, {d8-d15}
    102 	ldr	r1, [r0, #(_JB_REG_FPSCR * 4)]
    103 	vmsr	fpscr, r1
    104 #endif /* !__SOFTFP__ */
    105 
    106 	add	r0, r0, #(_JB_REG_R4 * 4)
    107 	/* Restore integer registers */
    108         ldmia	r0, {r4-r14}
    109 
    110 	/* Validate sp and r14 */
    111 	teq	sp, #0
    112 	teqne	r14, #0
    113 	beq	.Lbotch
    114 
    115 	/* Set return value */
    116 
    117 	mov	r0, r1
    118 	teq	r0, #0x00000000
    119 	moveq	r0, #0x00000001
    120 	RET
    121 
    122 	/* validation failed, die die die. */
    123 .Lbotch:
    124 	bl	PIC_SYM(_C_LABEL(longjmperror), PLT)
    125 	bl	PIC_SYM(_C_LABEL(abort), PLT)
    126 	b	. - 8		/* Cannot get here */
    127