1/*
2 * Copyright (c) 1980, 1993
3 *        The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include "DEFS.h"
31
32#if defined(LIBC_SCCS) && !defined(lint)
33          /* .asciz "@(#)_setjmp.s      8.1 (Berkeley) 6/4/93" */
34RCSID("$NetBSD: _setjmp.S,v 1.11 2024/06/29 06:52:34 rin Exp $")
35#endif /* LIBC_SCCS and not lint */
36
37/*
38 * C library -- _setjmp, _longjmp
39 *
40 *        _longjmp(a,v)
41 * will generate a "return(v)" from
42 * the last call to
43 *        _setjmp(a)
44 * by restoring registers from the stack,
45 * The previous signal state is NOT restored.
46 *
47 * Even though we don't use sigreturn14, we still store things in a sigcontext
48 * in order to be consistent.
49 */
50
51ENTRY(_setjmp, R6)
52          movl      4(%ap),%r0
53          movl      12(%fp),12(%r0)               # save frame pointer of caller
54          movl      16(%fp),20(%r0)               # save pc of caller
55          movl      8(%fp),16(%r0)                # save ap of caller
56          clrl      %r1                           # clear arg count
57          bbc       $13,6(%fp),1f                 # was this a callg?
58          addl3     $1,(%ap),%r1                  # get real arg count+1 for calls
591:        moval     24(%fp)[%r1],8(%r0) # save sp of caller
60          movpsl    24(%r0)                       # save current psl
61          movw      4(%fp),24(%r0)                # save psw of caller
62          movq      %r6,44(%r0)                   # save r6/r7
63          movq      %r8,52(%r0)                   # save r8/r9
64          movq      %r10,60(%r0)                  # save r10/r11
65          clrl      %r0
66          ret
67END(_setjmp)
68
69ENTRY(_longjmp, 0)
70          movl      8(%ap),%r0                    # return(v)
71          jneq      1f
72          movl      $1,%r0
731:        movl      4(%ap),%r1                    # fetch buffer
74          tstl      12(%r1)                       # is fp null
75          beql      botch
76          movq      44(%r1),%r6                   # restore r6/r7
77          movq      52(%r1),%r8                   # restore r8/r9
78          movq      60(%r1),%r10                  # restore r10/r11
79          movl      16(%r1),%ap                   # restore ap
80          movl      8(%r1),%sp                    # restore sp
81          movl      12(%r1),%fp                   # restore fp
82          movq      20(%r1),-(%sp)                # save pc/psl to new stack
83          rei                                     # and go back to saved pc/psl
84
85botch:
86          calls     $0,_C_LABEL(longjmperror)
87          halt
88END(_longjmp)
89