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#include "lint.h"
31#include <sys/types.h>
32#include <sys/stack.h>
33#include <sys/frame.h>
34#include <memory.h>
35#include <ucontext.h>
36#include <setjmp.h>
37#include "sigjmp_struct.h"
38#include "libc.h"
39
40#pragma weak _siglongjmp = siglongjmp
41
42void
43siglongjmp(sigjmp_buf env, int val)
44{
45	extern void _fetch_globals(greg_t *);
46	ucontext_t uc;
47	greg_t *reg = uc.uc_mcontext.gregs;
48	volatile sigjmp_struct_t *bp = (sigjmp_struct_t *)env;
49	greg_t fp = bp->sjs_fp;
50	greg_t i7 = bp->sjs_i7;
51
52	/*
53	 * Create a ucontext_t structure from scratch.
54	 * We only need to fetch the globals.
55	 * The outs are assumed to be trashed on return from sigsetjmp().
56	 * The ins and locals are restored from the resumed register window.
57	 * The floating point state is unmodified.
58	 * Everything else is in the sigjmp_struct_t buffer.
59	 */
60	(void) memset(&uc, 0, sizeof (uc));
61	uc.uc_flags = UC_STACK | UC_CPU;
62	_fetch_globals(&reg[REG_G1]);
63	uc.uc_stack = bp->sjs_stack;
64	uc.uc_link = bp->sjs_uclink;
65	reg[REG_PC] = bp->sjs_pc;
66	reg[REG_nPC] = reg[REG_PC] + 0x4;
67	reg[REG_SP] = bp->sjs_sp;
68
69	if (bp->sjs_flags & JB_SAVEMASK) {
70		uc.uc_flags |= UC_SIGMASK;
71		uc.uc_sigmask = bp->sjs_sigmask;
72	}
73
74	if (val)
75		reg[REG_O0] = (greg_t)val;
76	else
77		reg[REG_O0] = (greg_t)1;
78
79	/*
80	 * Copy the fp and i7 values into the register window save area.
81	 * These may have been clobbered between calls to sigsetjmp
82	 * and siglongjmp.  For example, the save area could have been
83	 * relocated to lower addresses and the original save area
84	 * given to an alloca() call.  Notice that all reads from
85	 * the sigjmp_struct_t buffer should take place before the
86	 * following two writes.  It is possible that user code may
87	 * move/copy the sigjmpbuf around, and overlap the original
88	 * register window save area.
89	 */
90	if (bp->sjs_sp != 0 && (bp->sjs_flags & JB_FRAMEPTR)) {
91		struct frame *sp = (struct frame *)(bp->sjs_sp + STACK_BIAS);
92		sp->fr_savfp = (struct frame *)fp;
93		sp->fr_savpc = i7;
94	}
95
96	(void) setcontext(&uc);
97}
98