longjmp.c revision 178580 
1/*	$NetBSD: longjmp.c,v 1.1 2005/09/17 11:49:39 tsutsui 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 <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/lib/libc/mips/gen/longjmp.c 178580 2008-04-26 12:08:02Z imp $");
41#include "namespace.h"
42#include <sys/types.h>
43#include <ucontext.h>
44#include <signal.h>
45#include <stdlib.h>
46#include <string.h>
47
48#include <machine/regnum.h>
49
50void
51__longjmp14(jmp_buf env, int val)
52{
53	struct sigcontext *sc = (void *)env;
54	ucontext_t uc;
55
56	/* Ensure non-zero SP and sigcontext magic number is present */
57	if (sc->sc_regs[_R_SP] == 0 || sc->sc_regs[_R_ZERO] != 0xACEDBADE)
58		goto err;
59
60	/* Ensure non-zero return value */
61	if (val == 0)
62		val = 1;
63
64	/*
65	 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK.
66	 *
67	 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK,
68	 * since libpthread may want to interpose on signal handling.
69	 */
70	uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
71
72	sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL);
73
74	/* Clear uc_link */
75	uc.uc_link = 0;
76
77	/* Save return value in context */
78	uc.uc_mcontext.__gregs[_R_V0] = val;
79
80	/* Copy saved registers */
81	uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[_R_S0];
82	uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[_R_S1];
83	uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[_R_S2];
84	uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[_R_S3];
85	uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[_R_S4];
86	uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[_R_S5];
87	uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[_R_S6];
88	uc.uc_mcontext.__gregs[_REG_S7] = sc->sc_regs[_R_S7];
89	uc.uc_mcontext.__gregs[_REG_S8] = sc->sc_regs[_R_S8];
90	uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_regs[_R_SP];
91	uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[_R_RA];
92	uc.uc_mcontext.__gregs[_REG_EPC] = sc->sc_pc;
93
94	/* Copy FP state */
95	if (sc->sc_fpused) {
96		/* FP saved regs are $f20 .. $f31 */
97		memcpy(&uc.uc_mcontext.__fpregs.__fp_r.__fp_regs[20],
98		    &sc->sc_fpregs[20], 32 - 20);
99		uc.uc_mcontext.__fpregs.__fp_csr =
100		    sc->sc_fpregs[_R_FSR - _FPBASE];
101		/* XXX sc_fp_control */
102		uc.uc_flags |= _UC_FPU;
103	}
104
105	setcontext(&uc);
106 err:
107	longjmperror();
108	abort();
109	/* NOTREACHED */
110}
111