1/*	$NetBSD: longjmp.c,v 1.6 2011/04/30 23:39:08 martin 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.
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 <stdio.h>
39#include <stddef.h>
40
41#define __LIBC12_SOURCE__
42#include <setjmp.h>
43#include <compat/include/setjmp.h>
44
45typedef struct {
46	__greg_t	g3;
47	__greg_t	g6;
48	__greg_t	g7;
49	__greg_t	dummy;
50	__greg_t	save_mask;
51} __jmp_buf_regs_t;
52
53/*
54 * setjmp.S uses hard coded offsets into the jump_buf,
55 * make sure any changes cause a compile failure here
56 */
57#ifndef lint	/* XXX this is too much for lint */
58__CTASSERT(0x68 == offsetof(__jmp_buf_regs_t,save_mask) +
59	sizeof(struct sigcontext));
60__CTASSERT(sizeof(sigjmp_buf) >= sizeof(__jmp_buf_regs_t) +
61	sizeof(struct sigcontext));
62#endif
63
64void
65__longjmp14(jmp_buf env, int val)
66{
67	struct sigcontext *sc = (void *)env;
68	__jmp_buf_regs_t *r = (void *)&sc[1];
69	ucontext_t uc;
70
71	/* Ensure non-zero SP */
72	if (sc->sc_sp == 0)
73		goto err;
74
75	/*
76	 * Set _UC_CPU. No FPU data saved, so we can't restore
77	 * that. Set _UC_{SET,CLR}STACK according to SS_ONSTACK
78	 */
79	memset(&uc, 0, sizeof(uc));
80	uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
81
82	/*
83	 * Set the signal mask - this is a weak symbol, so don't use
84	 * _UC_SIGMASK in the mcontext, libpthread might override sigprocmask.
85	 */
86	sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL);
87
88	/* Fill other registers */
89	uc.uc_mcontext.__gregs[_REG_CCR] = sc->sc_tstate;
90	uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc;
91	uc.uc_mcontext.__gregs[_REG_nPC] = sc->sc_pc+4;
92	uc.uc_mcontext.__gregs[_REG_G1] = sc->sc_g1;
93	uc.uc_mcontext.__gregs[_REG_G2] = sc->sc_o0;
94	uc.uc_mcontext.__gregs[_REG_G3] = r->g3;
95	uc.uc_mcontext.__gregs[_REG_G4] = 0;
96	uc.uc_mcontext.__gregs[_REG_G5] = 0;
97	uc.uc_mcontext.__gregs[_REG_G6] = r->g6;
98	uc.uc_mcontext.__gregs[_REG_G7] = r->g7;
99	uc.uc_mcontext.__gregs[_REG_O6] = sc->sc_sp;
100
101
102	/* Make return value non-zero */
103	if (val == 0)
104		val = 1;
105
106	/* Save return value in context */
107	uc.uc_mcontext.__gregs[_REG_O0] = val;
108
109	setcontext(&uc);
110
111 err:
112	longjmperror();
113	abort();
114	/* NOTREACHED */
115}
116