Annotation of sys/lib/libkern/arch/sparc/_setjmp.S, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: _setjmp.S,v 1.3 2003/06/02 23:28:09 millert Exp $ */
! 2: /* $NetBSD: _setjmp.S,v 1.2 1994/10/26 06:39:54 cgd Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1992, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * This software was developed by the Computer Systems Engineering group
! 9: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 10: * contributed to Berkeley.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. Neither the name of the University nor the names of its contributors
! 21: * may be used to endorse or promote products derived from this software
! 22: * without specific prior written permission.
! 23: *
! 24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 34: * SUCH DAMAGE.
! 35: *
! 36: * Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp
! 37: */
! 38:
! 39: #if defined(LIBC_SCCS) && !defined(lint)
! 40: #ifdef notdef
! 41: .asciz "@(#)_setjmp.s 8.1 (Berkeley) 6/4/93"
! 42: #endif
! 43: .asciz "$OpenBSD: _setjmp.S,v 1.3 2003/06/02 23:28:09 millert Exp $"
! 44: #endif /* LIBC_SCCS and not lint */
! 45:
! 46: /*
! 47: * C library -- _setjmp, _longjmp
! 48: *
! 49: * _longjmp(a,v)
! 50: * will generate a "return(v?v:1)" from
! 51: * the last call to
! 52: * _setjmp(a)
! 53: * by unwinding the call stack.
! 54: * The previous signal state is NOT restored.
! 55: */
! 56:
! 57: #include "DEFS.h"
! 58:
! 59: ENTRY(_setjmp)
! 60: std %sp, [%o0+0] /* caller's stack pointer and return pc */
! 61: st %fp, [%o0+8] /* store caller's frame pointer */
! 62: retl
! 63: clr %o0 ! return 0
! 64:
! 65: ENTRY(_longjmp)
! 66: addcc %o1, %g0, %g6 ! compute v ? v : 1 in a global register
! 67: be,a 0f
! 68: mov 1, %g6
! 69: 0:
! 70: mov %o0, %g1 ! save a in another global register
! 71: ld [%g1+8], %g7 /* get caller's frame */
! 72: 1:
! 73: cmp %fp, %g7 ! compare against desired frame
! 74: bl,a 1b ! if below,
! 75: restore ! pop frame and loop
! 76: be,a 2f ! if there,
! 77: ldd [%g1+0], %o2 ! fetch return %sp and pc, and get out
! 78:
! 79: Lbotch:
! 80: call _longjmperror ! otherwise, went too far; bomb out
! 81: nop
! 82: unimp 0
! 83:
! 84: 2:
! 85: cmp %o2, %sp ! %sp must not decrease
! 86: bge,a 3f
! 87: mov %o2, %sp ! it is OK, put it in place
! 88: b,a Lbotch
! 89: 3:
! 90: jmp %o3 + 8 ! success, return %g6
! 91: mov %g6, %o0
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