1 /* $NetBSD: setjmp.S,v 1.15 2013/07/17 03:05:41 matt 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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32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <machine/asm.h>
39 #if defined(LIBC_SCCS) && !defined(lint)
41 RCSID("from: @(#)setjmp.s 5.1 (Berkeley) 5/12/90")
43 RCSID("$NetBSD: setjmp.S,v 1.15 2013/07/17 03:05:41 matt Exp $")
45 #endif /* LIBC_SCCS and not lint */
48 * C library -- setjmp, longjmp
51 * will generate a "return(v)" from
54 * by restoring registers from the stack,
55 * and a struct sigcontext, see <signal.h>
59 /* Get signal stack info. Note overlay of ss_sp and ss_size! */
60 lea -12(%sp),%sp /* sizeof(stack_t) */
61 clrl (%sp) /* ss = NULL */
62 movl %sp,4(%sp) /* oss = stack_t on stack */
63 jbsr PIC_PLT(_C_LABEL(__sigaltstack14))
65 movl 8(%sp),%d0 /* ss_flags */
66 andl #1,%d0 /* extract SS_ONSTACK */
67 lea 12(%sp),%sp /* pop stack_t */
69 /* Get pointer to jmp_buf; a sigcontext is at the beginning. */
71 movl %d0,SC_ONSTACK(%a0) /* store onstack */
72 clrl SC___MASK13(%a0) /* unused word (old style signal mask) */
74 /* Get the signal mask. */
75 pea SC_MASK(%a0) /* oset = &sc.sc_mask */
76 movl #0,-(%sp) /* set = NULL */
77 movl #0,-(%sp) /* action = 0 <ignored> */
78 jbsr PIC_PLT(_C_LABEL(__sigprocmask14))
81 movl 4(%sp),%a0 /* get jmp_buf pointer again */
82 lea 4(%sp),%a1 /* adjust SP since we won't rts */
83 movl %a1,SC_SP(%a0) /* save SP */
84 movl %a6,SC_FP(%a0) /* save FP */
85 clrl SC_AP(%a0) /* no AP */
86 movl (%sp),SC_PC(%a0)/* save return PC */
87 clrl SC_PS(%a0) /* clear PS */
89 /* Save remaining non-scratch regs after signal mask. */
90 moveml #0x3CFC,SC_SIZE(%a0)
92 clrl %d0 /* return 0 */