Annotation of sys/lib/libkern/arch/sparc64/_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 1.1.1.1 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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