__longjmp14.c revision 1.3 
1/*	$NetBSD: __longjmp14.c,v 1.3 2005/09/14 13:46:32 he 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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *        This product includes software developed by the NetBSD
21 *        Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include "namespace.h"
40#include <sys/types.h>
41#include <ucontext.h>
42#include <signal.h>
43#include <stdlib.h>
44#include <string.h>
45#include <machine/reg.h>
46
47#define __LIBC12_SOURCE__
48#include <setjmp.h>
49#include <compat/include/setjmp.h>
50
51struct _jmp_buf {
52	struct sigcontext jb_sc;
53	register_t jb_regs[6];
54};
55
56void
57__longjmp14(jmp_buf env, int val)
58{
59	struct _jmp_buf *jb = (void *)env;
60	ucontext_t uc;
61
62	/* Ensure non-zero SP */
63	if (jb->jb_sc.sc_sp == 0)
64		goto err;
65
66	/* Ensure non-zero return value */
67	if (val == 0)
68		val = -1;
69
70	/* Set _UC_SIGMASK and _UC_CPU */
71	uc.uc_flags = _UC_SIGMASK | _UC_CPU;
72
73	/* Clear uc_link */
74	uc.uc_link = 0;
75
76	/* Save return value in context */
77	uc.uc_mcontext.__gregs[_REG_R0] = val;
78
79	/* Copy saved registers */
80	uc.uc_mcontext.__gregs[_REG_AP] = jb->jb_sc.sc_ap;
81	uc.uc_mcontext.__gregs[_REG_SP] = jb->jb_sc.sc_sp;
82	uc.uc_mcontext.__gregs[_REG_FP] = jb->jb_sc.sc_fp;
83	uc.uc_mcontext.__gregs[_REG_PC] = jb->jb_sc.sc_pc;
84	uc.uc_mcontext.__gregs[_REG_PSL] = jb->jb_sc.sc_ps;
85
86	uc.uc_mcontext.__gregs[_REG_R6] = jb->jb_regs[0];
87	uc.uc_mcontext.__gregs[_REG_R7] = jb->jb_regs[1];
88	uc.uc_mcontext.__gregs[_REG_R8] = jb->jb_regs[2];
89	uc.uc_mcontext.__gregs[_REG_R9] = jb->jb_regs[3];
90	uc.uc_mcontext.__gregs[_REG_R10] = jb->jb_regs[4];
91	uc.uc_mcontext.__gregs[_REG_R11] = jb->jb_regs[5];
92
93	/* Copy signal mask */
94	uc.uc_sigmask = jb->jb_sc.sc_mask;
95
96	setcontext(&uc);
97 err:
98	longjmperror();
99	abort();
100	/* NOTREACHED */
101}
102