1 /* $NetBSD: longjmp.c,v 1.5 2012/03/29 19:27:05 christos 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
39 #include <machine/regnum.h>
40
41 #define __LIBC12_SOURCE__
42 #include <setjmp.h>
43 #include <compat/include/setjmp.h>
44
45 void
__longjmp14(jmp_buf env,int val)46 __longjmp14(jmp_buf env, int val)
47 {
48 struct sigcontext *sc = (void *)env;
49 ucontext_t uc;
50
51 /* Ensure non-zero SP and sigcontext magic number is present */
52 if (sc->sc_regs[_R_SP] == 0 || sc->sc_regs[_R_ZERO] != (mips_reg_t)0xACEDBADEU)
53 goto err;
54
55 /* Ensure non-zero return value */
56 if (val == 0)
57 val = 1;
58
59 /*
60 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK.
61 *
62 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK,
63 * since libpthread may want to interpose on signal handling.
64 */
65 uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
66
67 sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL);
68
69 /* Clear uc_link */
70 uc.uc_link = 0;
71
72 /* Save return value in context */
73 uc.uc_mcontext.__gregs[_REG_V0] = val;
74
75 /* Copy saved registers */
76 uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[_R_S0];
77 uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[_R_S1];
78 uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[_R_S2];
79 uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[_R_S3];
80 uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[_R_S4];
81 uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[_R_S5];
82 uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[_R_S6];
83 uc.uc_mcontext.__gregs[_REG_S7] = sc->sc_regs[_R_S7];
84 uc.uc_mcontext.__gregs[_REG_S8] = sc->sc_regs[_R_S8];
85 #if defined(__mips_n32) || defined(__mips_n64)
86 uc.uc_mcontext.__gregs[_REG_GP] = sc->sc_regs[_R_GP];
87 #endif
88 uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_regs[_R_SP];
89 uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[_R_RA];
90 uc.uc_mcontext.__gregs[_REG_EPC] = sc->sc_pc;
91
92 /* Copy FP state */
93 if (sc->sc_fpused) {
94 /* FP saved regs are $f20 .. $f31 */
95 memcpy(&uc.uc_mcontext.__fpregs.__fp_r.__fp_regs[20],
96 &sc->sc_fpregs[20], 32 - 20);
97 uc.uc_mcontext.__fpregs.__fp_csr =
98 sc->sc_fpregs[_R_FSR - _FPBASE];
99 /* XXX sc_fp_control */
100 uc.uc_flags |= _UC_FPU;
101 }
102
103 setcontext(&uc);
104 err:
105 longjmperror();
106 abort();
107 /* NOTREACHED */
108 }
109