1 /* $NetBSD: __longjmp14.c,v 1.5 2012/03/22 12:31:32 skrll 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
39 #define __LIBC12_SOURCE__
40 #include <setjmp.h>
41 #include <compat/include/setjmp.h>
42
43 #include <stdio.h>
44 #include <unistd.h>
45
46 ssize_t _sys_write(int, void *, size_t);
47
48 void
__longjmp14(jmp_buf env,int val)49 __longjmp14(jmp_buf env, int val)
50 {
51 ucontext_t uc;
52 struct sigcontext *sc = (void *)env;
53 register_t *regs = (void *)(sc + 1);
54 register register_t dp __asm("r27");
55
56 /* Ensure non-zero SP */
57 if (sc->sc_sp == 0)
58 goto err;
59
60 /* Make return value non-zero */
61 if (val == 0)
62 val = 1;
63
64 /* Copy callee-saved regs */
65 regs -= 3;
66 uc.uc_mcontext.__gregs[3] = regs[3];
67 uc.uc_mcontext.__gregs[4] = regs[4];
68 uc.uc_mcontext.__gregs[5] = regs[5];
69 uc.uc_mcontext.__gregs[6] = regs[6];
70 uc.uc_mcontext.__gregs[7] = regs[7];
71 uc.uc_mcontext.__gregs[8] = regs[8];
72 uc.uc_mcontext.__gregs[9] = regs[9];
73 uc.uc_mcontext.__gregs[10] = regs[10];
74 uc.uc_mcontext.__gregs[11] = regs[11];
75 uc.uc_mcontext.__gregs[12] = regs[12];
76 uc.uc_mcontext.__gregs[13] = regs[13];
77 uc.uc_mcontext.__gregs[14] = regs[14];
78 uc.uc_mcontext.__gregs[15] = regs[15];
79 uc.uc_mcontext.__gregs[16] = regs[16];
80 uc.uc_mcontext.__gregs[17] = regs[17];
81 uc.uc_mcontext.__gregs[18] = regs[18];
82
83 /* Preserve the current value of DP */
84 /* LINTED dp is r27, so is "initialized" */
85 uc.uc_mcontext.__gregs[27] = dp;
86
87 /* Set the desired return value. */
88 uc.uc_mcontext.__gregs[_REG_RET0] = val;
89
90 /*
91 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK.
92 *
93 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK,
94 * since libpthread may want to interpose on signal handling.
95 */
96 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
97
98 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL);
99
100 /* Clear uc_link */
101 uc.uc_link = 0;
102
103 /* Copy signal mask */
104 uc.uc_sigmask = sc->sc_mask;
105
106 /* Copy special regs */
107 uc.uc_mcontext.__gregs[_REG_PSW] = sc->sc_ps;
108 uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_sp;
109 uc.uc_mcontext.__gregs[_REG_PCSQH] = sc->sc_pcsqh;
110 uc.uc_mcontext.__gregs[_REG_PCOQH] = sc->sc_pcoqh;
111 uc.uc_mcontext.__gregs[_REG_PCSQT] = sc->sc_pcsqt;
112 uc.uc_mcontext.__gregs[_REG_PCOQT] = sc->sc_pcoqt;
113
114 setcontext(&uc);
115 err:
116 longjmperror();
117 abort();
118 /* NOTREACHED */
119 }
120