1 /* $NetBSD: longjmp.c,v 1.7 2012/03/17 21:35:06 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
45 typedef 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
64 void
__longjmp14(jmp_buf env,int val)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