Annotation of sys/lib/libkern/arch/sparc64/_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 1.1.1.1 1998/06/20 05:18:14 eeh 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 "$NetBSD: _setjmp.S,v 1.1.1.1 1998/06/20 05:18:14 eeh 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: btst 1, %sp
! 61: bne,a,pt %xcc, 1f ! 32 or 64-bit stack?
! 62: std %sp, [%o0+0] ! 32-bit stack pointer & return pc
! 63:
! 64: stx %sp, [%o0+0] ! 64-bit stack pointer
! 65: stx %o7, [%o0+8] ! 64-bit return pc
! 66: stx %fp, [%o0+16] ! 64-bit frame pointer
! 67: retl
! 68: clr %o0
! 69: 1:
! 70: st %fp, [%o0+8] ! 32-bit frame pointer
! 71: retl
! 72: clr %o0
! 73:
! 74: ENTRY(_longjmp)
! 75: set 1, %g6
! 76: btst 1, %fp ! 32 or 64-bit stack?
! 77: movrz %o1, %o1, %g6 ! compute v ? v : 1 in a global register
! 78: bne,pt %xcc, 2f ! 64-bit
! 79: mov %o0, %g1 ! save a in another global register
! 80: ld [%g1+8], %g7 /* get caller's frame */
! 81:
! 82: 1:
! 83: cmp %fp, %g7 ! compare against desired frame
! 84: bl,a 1b ! if below,
! 85: restore ! pop frame and loop
! 86: bne,pn %icc, Llongjmpbotch ! if there,
! 87: ldd [%g1+0], %o2 ! fetch return %sp and pc, and get out
! 88: ba,a,pt %icc, 4f
! 89: 2:
! 90: ldx [%g1+16], %g7 /* get caller's frame */
! 91:
! 92: 3:
! 93: cmp %fp, %g7 ! compare against desired frame
! 94: bl,a,pt %xcc, 3b ! if below,
! 95: restore ! pop frame and loop
! 96: bne,pn %xcc, Llongjmpbotch ! if there,
! 97: ldx [%g1+0], %o2 ! fetch return %sp and pc, and get out
! 98: ldx [%g1+8], %o3
! 99: 4:
! 100: cmp %o2, %sp ! %sp must not decrease
! 101: blt,pn %icc, Llongjmpbotch
! 102: movge %icc, %o2, %sp ! it is OK, put it in place
! 103: jmp %o3 + 8 ! success, return %g6
! 104: mov %g6, %o0
! 105:
! 106: Lbotch:
! 107: call _longjmperror ! otherwise, went too far; bomb out
! 108: nop
! 109: unimp 0
! 110: ! otherwise, went too far; bomb out
! 111:
! 112:
! 113:
! 114:
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