1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 #pragma weak _siglongjmp = siglongjmp
33
34 #include "lint.h"
35 #include <sys/types.h>
36 #include <sys/stack.h>
37 #include <sys/frame.h>
38 #include <memory.h>
39 #include <ucontext.h>
40 #include <setjmp.h>
41 #include "sigjmp_struct.h"
42 #include "libc.h"
43
44 void
siglongjmp(sigjmp_buf env,int val)45 siglongjmp(sigjmp_buf env, int val)
46 {
47 extern void _fetch_globals(greg_t *);
48 ucontext_t uc;
49 greg_t *reg = uc.uc_mcontext.gregs;
50 volatile sigjmp_struct_t *bp = (sigjmp_struct_t *)env;
51 greg_t fp = bp->sjs_fp;
52 greg_t i7 = bp->sjs_i7;
53
54 /*
55 * Create a ucontext_t structure from scratch.
56 * We only need to fetch the globals.
57 * The outs are assumed to be trashed on return from sigsetjmp().
58 * The ins and locals are restored from the resumed register window.
59 * The floating point state is unmodified.
60 * Everything else is in the sigjmp_struct_t buffer.
61 */
62 (void) memset(&uc, 0, sizeof (uc));
63 uc.uc_flags = UC_STACK | UC_CPU;
64 _fetch_globals(®[REG_G1]);
65 uc.uc_stack = bp->sjs_stack;
66 uc.uc_link = bp->sjs_uclink;
67 reg[REG_PC] = bp->sjs_pc;
68 reg[REG_nPC] = reg[REG_PC] + 0x4;
69 reg[REG_SP] = bp->sjs_sp;
70
71 if (bp->sjs_flags & JB_SAVEMASK) {
72 uc.uc_flags |= UC_SIGMASK;
73 uc.uc_sigmask = bp->sjs_sigmask;
74 }
75
76 if (val)
77 reg[REG_O0] = (greg_t)val;
78 else
79 reg[REG_O0] = (greg_t)1;
80
81 /*
82 * Copy the fp and i7 values into the register window save area.
83 * These may have been clobbered between calls to sigsetjmp
84 * and siglongjmp. For example, the save area could have been
85 * relocated to lower addresses and the original save area
86 * given to an alloca() call. Notice that all reads from
87 * the sigjmp_struct_t buffer should take place before the
88 * following two writes. It is possible that user code may
89 * move/copy the sigjmpbuf around, and overlap the original
90 * register window save area.
91 */
92 if (bp->sjs_sp != 0 && (bp->sjs_flags & JB_FRAMEPTR)) {
93 struct frame *sp = (struct frame *)(bp->sjs_sp + STACK_BIAS);
94 sp->fr_savfp = (struct frame *)fp;
95 sp->fr_savpc = i7;
96 }
97
98 (void) setcontext(&uc);
99 }
100