Annotation of sys/arch/m68k/m68k/sigreturn.s, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: sigreturn.s,v 1.3 2003/06/02 23:27:48 millert Exp $ */
2: /* $NetBSD: sigreturn.s,v 1.2 1997/04/25 02:22:04 thorpej Exp $ */
3:
4: /*
5: * Copyright (c) 1988 University of Utah.
6: * Copyright (c) 1980, 1990, 1993
7: * The Regents of the University of California. All rights reserved.
8: *
9: * This code is derived from software contributed to Berkeley by
10: * the Systems Programming Group of the University of Utah Computer
11: * Science Department.
12: *
13: * Redistribution and use in source and binary forms, with or without
14: * modification, are permitted provided that the following conditions
15: * are met:
16: * 1. Redistributions of source code must retain the above copyright
17: * notice, this list of conditions and the following disclaimer.
18: * 2. Redistributions in binary form must reproduce the above copyright
19: * notice, this list of conditions and the following disclaimer in the
20: * documentation and/or other materials provided with the distribution.
21: * 3. Neither the name of the University nor the names of its contributors
22: * may be used to endorse or promote products derived from this software
23: * without specific prior written permission.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35: * SUCH DAMAGE.
36: *
37: * from: Utah $Hdr: locore.s 1.66 92/12/22$
38: *
39: * @(#)locore.s 8.6 (Berkeley) 5/27/94
40: */
41:
42: /*
43: * NOTICE: This is not a standalone file. To use it, #include it in
44: * your port's locore.s, like so:
45: *
46: * #include <m68k/m68k/sigreturn.s>
47: */
48:
49: /*
50: * The sigreturn() syscall comes here. It requires special handling
51: * because we must open a hole in the stack to fill in the (possibly much
52: * larger) original stack frame.
53: */
54: ASENTRY_NOPROFILE(sigreturn)
55: lea sp@(-84),sp | leave enough space for largest frame
56: movl sp@(84),sp@ | move up current 8 byte frame
57: movl sp@(88),sp@(4)
58: movl #84,sp@- | default: adjust by 84 bytes
59: moveml #0xFFFF,sp@- | save user registers
60: movl usp,a0 | save the user SP
61: movl a0,sp@(FR_SP) | in the savearea
62: movl #SYS_sigreturn,sp@- | push syscall number
63: jbsr _C_LABEL(syscall) | handle it
64: addql #4,sp | pop syscall#
65: movl sp@(FR_SP),a0 | grab and restore
66: movl a0,usp | user SP
67: lea sp@(FR_HW),a1 | pointer to HW frame
68: movw sp@(FR_ADJ),d0 | do we need to adjust the stack?
69: jeq Lsigr1 | no, just continue
70: moveq #92,d1 | total size
71: subw d0,d1 | - hole size = frame size
72: lea a1@(92),a0 | destination
73: addw d1,a1 | source
74: lsrw #1,d1 | convert to word count
75: subqw #1,d1 | minus 1 for dbf
76: Lsigrlp:
77: movw a1@-,a0@- | copy a word
78: dbf d1,Lsigrlp | continue
79: movl a0,a1 | new HW frame base
80: Lsigr1:
81: movl a1,sp@(FR_SP) | new SP value
82: moveml sp@+,#0x7FFF | restore user registers
83: movl sp@,sp | and our SP
84: jra _ASM_LABEL(rei) | all done
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