Annotation of sys/lib/libkern/arch/sparc/_setjmp.S, Revision 1.1.1.1
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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