1/*	$NetBSD: __longjmp14.c,v 1.6 2024/06/29 06:52:34 rin Exp $	*/
2
3/*-
4 * Copyright (c) 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christian Limpach and Matt Thomas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "namespace.h"
33#include <sys/types.h>
34#include <ucontext.h>
35#include <signal.h>
36#include <stdlib.h>
37#include <string.h>
38#include <machine/reg.h>
39
40#define __LIBC12_SOURCE__
41#include <setjmp.h>
42#include <compat/include/setjmp.h>
43
44struct _jmp_buf {
45	struct sigcontext jb_sc;
46	__register_t jb_regs[6];
47};
48
49void
50__longjmp14(jmp_buf env, int val)
51{
52	struct _jmp_buf *jb = (void *)env;
53	ucontext_t uc;
54
55	/* Ensure non-zero SP */
56	if (jb->jb_sc.sc_sp == 0)
57		goto err;
58
59	/* Return 1 if val is zero */
60	if (val == 0)
61		val = 1;
62
63	/* Set _UC_SIGMASK and _UC_CPU */
64	uc.uc_flags = _UC_SIGMASK | _UC_CPU;
65
66	/* Clear uc_link */
67	uc.uc_link = 0;
68
69	/* Save return value in context */
70	uc.uc_mcontext.__gregs[_REG_R0] = val;
71
72	/* Copy saved registers */
73	uc.uc_mcontext.__gregs[_REG_AP] = jb->jb_sc.sc_ap;
74	uc.uc_mcontext.__gregs[_REG_SP] = jb->jb_sc.sc_sp;
75	uc.uc_mcontext.__gregs[_REG_FP] = jb->jb_sc.sc_fp;
76	uc.uc_mcontext.__gregs[_REG_PC] = jb->jb_sc.sc_pc;
77	uc.uc_mcontext.__gregs[_REG_PSL] = jb->jb_sc.sc_ps;
78
79	uc.uc_mcontext.__gregs[_REG_R6] = jb->jb_regs[0];
80	uc.uc_mcontext.__gregs[_REG_R7] = jb->jb_regs[1];
81	uc.uc_mcontext.__gregs[_REG_R8] = jb->jb_regs[2];
82	uc.uc_mcontext.__gregs[_REG_R9] = jb->jb_regs[3];
83	uc.uc_mcontext.__gregs[_REG_R10] = jb->jb_regs[4];
84	uc.uc_mcontext.__gregs[_REG_R11] = jb->jb_regs[5];
85
86	/* Copy signal mask */
87	uc.uc_sigmask = jb->jb_sc.sc_mask;
88
89	setcontext(&uc);
90 err:
91	longjmperror();
92	abort();
93	/* NOTREACHED */
94}
95