usr/arch/arm/setjmp.S

Prex Home / Browse Source - Prex Version: 0.9.0
/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
setjmp
longjmp
   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, #((25-13) * 4)]
  60 
  61         ldr     r1, .Lsetjmp_magic
  62         str     r1, [r0], #4
  63 
  64 #if 0 /* PREX */
  65 #ifdef SOFTFLOAT
  66         add     r0, r0, #52
  67 #else
  68         /* Store fp registers */
  69         sfm     f4, 4, [r0], #48
  70         /* Store fpsr */
  71         rfs     r1
  72         str     r1, [r0], #0x0004
  73 #endif  /*SOFTFLOAT*/
  74 #endif
  75         /* Store integer registers */
  76         stmia   r0, {r4-r14}
  77         mov     r0, #0x00000000
  78         mov     r15, r14
  79 
  80 .Lsetjmp_magic:
  81         .word   _JB_MAGIC_SETJMP
  82 
  83 
  84 ENTRY(longjmp)
  85         ldr     r2, .Lsetjmp_magic
  86         ldr     r3, [r0]
  87         teq     r2, r3
  88         bne     botch
  89 
  90         /* Fetch signal mask */
  91         ldr     r2, [r0, #((25-13) * 4)]
  92 
  93         /* Set signal mask */
  94         stmfd   sp!, {r0, r1, r14}
  95         sub     sp, sp, #4      /* align the stack */
  96 
  97         mov     r0, r2
  98         bl      PIC_SYM(_C_LABEL(sigsetmask), PLT)
  99 
 100         add     sp, sp, #4      /* unalign the stack */
 101         ldmfd   sp!, {r0, r1, r14}
 102 
 103         add     r0, r0, #4
 104 #if 0 /* PREX */
 105 #ifdef SOFTFLOAT
 106         add     r0, r0, #52
 107 #else
 108         /* Restore fp registers */
 109         lfm     f4, 4, [r0], #48
 110         /* Restore FPSR */
 111         ldr     r4, [r0], #0x0004
 112         wfs     r4
 113 #endif  /* SOFTFLOAT */
 114 #endif
 115         /* Restore integer registers */
 116         ldmia   r0, {r4-r14}
 117 
 118         /* Validate sp and r14 */
 119         teq     sp, #0
 120         teqne   r14, #0
 121         beq     botch
 122 
 123         /* Set return value */
 124 
 125         mov     r0, r1
 126         teq     r0, #0x00000000
 127         moveq   r0, #0x00000001
 128 #ifdef __ARM_26__
 129         mov     r15, r14
 130 #else
 131         mov     r15, r14
 132 #endif
 133 
 134         /* validation failed, die die die. */
 135 botch:
 136 #if 0 /* PREX */
 137         bl      PIC_SYM(_C_LABEL(longjmperror), PLT)
 138 #endif
 139         bl      PIC_SYM(_C_LABEL(abort), PLT)
 140         b       . - 8           /* Cannot get here */
/* [<][>][^][v][top][bottom][index][help] */
root/usr/arch/arm/setjmp.S

DEFINITIONS
