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_setjmp.S revision 1.11 
      1 /*	$NetBSD: _setjmp.S,v 1.11 2013/04/19 13:14:10 skrll 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__) && !defined(__ARM_PCS)
     36 #error FPA is not supported anymore
     37 #endif
     38 
     39 #ifdef __ARM_EABI__
     40 	.fpu	vfp
     41 #endif
     42 
     43 #include <machine/asm.h>
     44 #include <machine/setjmp.h>
     45 
     46 /*
     47  * C library -- _setjmp, _longjmp
     48  *
     49  *	_longjmp(a,v)
     50  * will generate a "return(v)" from the last call to
     51  *	_setjmp(a)
     52  * by restoring registers from the stack.
     53  * The previous signal state is NOT restored.
     54  *
     55  * Note: r0 is the return value
     56  *       r1-r3,ip are scratch registers in functions
     57  */
     58 
     59 ENTRY(_setjmp)
     60 	ldr	r1, .L_setjmp_magic
     61 
     62 #ifdef __ARM_EABI__
     63 	ldr	r2, .Lfpu_present
     64 #ifdef PIC
     65 	GOT_INIT(r3, .L_setjmp_got, .L_setjmp_gotinit)
     66 	ldr	r2, [r2, r3]
     67 #else
     68 	ldr	r2, [r2]
     69 #endif
     70 	teq	r2, #0		/* do we have a FPU? */
     71 	beq	1f		/*   no, don't save VFP registers */
     72 
     73 	orr	r1, r1, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP)
     74 				/* change magic to VFP magic */
     75 	add	r2, r0, #(_JB_REG_D8 * 4)
     76 	vstmia	r2, {d8-d15}
     77 	vmrs	r2, fpscr
     78 	str	r2, [r0, #(_JB_REG_FPSCR * 4)]
     79 1:
     80 #endif /* __ARM_EABI__ */
     81 
     82 	str	r1, [r0]
     83 
     84 	add	r0, r0, #(_JB_REG_R4 * 4)
     85 	/* Store integer registers */
     86         stmia	r0, {r4-r14}
     87 
     88         mov	r0, #0x00000000
     89         RET
     90 
     91 .L_setjmp_magic:
     92 	.word	_JB_MAGIC__SETJMP
     93 #ifdef __ARM_EABI__
     94 	GOT_INITSYM(.L_setjmp_got, .L_setjmp_gotinit)
     95 .Lfpu_present:
     96 	.word	PIC_SYM(_libc_arm_fpu_present, GOTOFF)
     97 #endif /* __ARM_EABI__ */
     98 
     99 ENTRY(_longjmp)
    100 	ldr	r2, [r0]			/* get magic from jmp_buf */
    101 	bic	r3, r2, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP)
    102 						/* ignore VFP-ness of magic */
    103 	ldr	ip, .L_setjmp_magic		/* load magic */
    104 	teq	ip, r3				/* magic correct? */
    105 	bne	botch				/*   no, botch */
    106 
    107 #ifdef __ARM_EABI__
    108 	teq	r3, r2				/* did magic change? */
    109 	beq	1f				/*   no, don't restore VFP */
    110 	add	ip, r0, #(_JB_REG_D8 * 4)
    111 	vldmia	ip, {d8-d15}
    112 	ldr	ip, [r0, #(_JB_REG_FPSCR * 4)]
    113 	vmsr	fpscr, ip
    114 1:
    115 #endif /* __ARM_EABI__ */
    116 
    117 	add	r0, r0, #(_JB_REG_R4 * 4)
    118        	/* Restore integer registers */
    119         ldmia	r0, {r4-r14}
    120 
    121 	/* Validate sp and r14 */
    122 	teq	sp, #0
    123 	teqne	r14, #0
    124 	beq	botch
    125 
    126 	/* Set return value */
    127 	mov	r0, r1
    128 	teq	r0, #0x00000000
    129 	moveq	r0, #0x00000001
    130 	RET
    131 
    132 	/* validation failed, die die die. */
    133 botch:
    134 	bl	PIC_SYM(_C_LABEL(longjmperror), PLT)
    135 	bl	PIC_SYM(_C_LABEL(abort), PLT)
    136 	b	. - 8		/* Cannot get here */
    137