xref: /minix3/lib/libc/arch/vax/gen/__longjmp14.c (revision 2fe8fb192fe7e8720e3e7a77f928da545e872a6a)
1 /*	$NetBSD: __longjmp14.c,v 1.4 2008/04/28 20:22:57 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 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 
44 struct _jmp_buf {
45 	struct sigcontext jb_sc;
46 	register_t jb_regs[6];
47 };
48 
49 void
__longjmp14(jmp_buf env,int val)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 	/* Ensure non-zero return value */
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