Annotation of prex/usr/arch/arm/setjmp.S, Revision 1.1
1.1 ! nbrk 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 */
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