1 /* $NetBSD: setjmp.S,v 1.12 2006/03/09 16:20:27 christos Exp $ */
4 * Copyright (c) 1990 The Regents of the University of California.
7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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36 #include <machine/asm.h>
38 #if defined(LIBC_SCCS) && !defined(lint)
40 RCSID("from: @(#)setjmp.s 5.1 (Berkeley) 5/12/90")
42 RCSID("$NetBSD: setjmp.S,v 1.12 2006/03/09 16:20:27 christos Exp $")
44 #endif /* LIBC_SCCS and not lint */
47 * C library -- setjmp, longjmp
50 * will generate a "return(v)" from
53 * by restoring registers from the stack,
54 * and a struct sigcontext, see <signal.h>
58 /* Get signal stack info. Note overlay of ss_sp and ss_size! */
59 lea %sp@(-12),%sp /* sizeof(stack_t) */
60 clrl %sp@ /* ss = NULL */
61 movl %sp,%sp@(4) /* oss = stack_t on stack */
62 jbsr PIC_PLT(_C_LABEL(__sigaltstack14))
64 movl %sp@(8),%d0 /* ss_flags */
65 andl #1,%d0 /* extract SS_ONSTACK */
66 lea %sp@(12),%sp /* pop stack_t */
68 /* Get pointer to jmp_buf; a sigcontext is at the beginning. */
70 movl %d0,%a0@ /* store onstack */
71 clrl %a0@(4) /* unused word (old style signal mask) */
73 /* Get the signal mask. */
74 pea %a0@(28) /* oset = &sc.sc_mask */
75 movl #0,%sp@- /* set = NULL */
76 movl #0,%sp@- /* action = 0 <ignored> */
77 jbsr PIC_PLT(_C_LABEL(__sigprocmask14))
80 movl %sp@(4),%a0 /* get jmp_buf pointer again */
81 lea %sp@(4),%a1 /* adjust SP since we won't rts */
82 movl %a1,%a0@(8) /* save SP */
83 movl %a6,%a0@(12) /* save FP */
84 clrl %a0@(16) /* no AP */
85 movl %sp@,%a0@(20) /* save return PC */
86 clrl %a0@(24) /* clear PS */
88 /* Save remaining non-scratch regs after signal mask. */
89 moveml #0x3CFC,%a0@(44)
91 clrl %d0 /* return 0 */