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 (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26/*	Copyright (c) 1988 AT&T	*/
27/*	  All Rights Reserved	*/
28
29#include "lint.h"
30#include <sys/types.h>
31#include <sys/stack.h>
32#include <sys/frame.h>
33#include <memory.h>
34#include <ucontext.h>
35#include <setjmp.h>
36#include "sigjmp_struct.h"
37#include "libc.h"
38
39#pragma weak _siglongjmp = siglongjmp
40
41void
42siglongjmp(sigjmp_buf env, int val)
43{
44	extern void _fetch_globals(greg_t *);
45	ucontext_t uc;
46	greg_t *reg = uc.uc_mcontext.gregs;
47	volatile sigjmp_struct_t *bp = (sigjmp_struct_t *)env;
48	greg_t fp = bp->sjs_fp;
49	greg_t i7 = bp->sjs_i7;
50
51	/*
52	 * Create a ucontext_t structure from scratch.
53	 * We only need to fetch the globals.
54	 * The outs are assumed to be trashed on return from sigsetjmp().
55	 * The ins and locals are restored from the resumed register window.
56	 * The floating point state is unmodified.
57	 * Everything else is in the sigjmp_struct_t buffer.
58	 */
59	(void) memset(&uc, 0, sizeof (uc));
60	uc.uc_flags = UC_STACK | UC_CPU;
61	_fetch_globals(&reg[REG_G1]);
62	uc.uc_stack = bp->sjs_stack;
63	uc.uc_link = bp->sjs_uclink;
64	reg[REG_PC] = bp->sjs_pc;
65	reg[REG_nPC] = reg[REG_PC] + 0x4;
66	reg[REG_SP] = bp->sjs_sp;
67	reg[REG_ASI] = bp->sjs_asi;
68	reg[REG_FPRS] = bp->sjs_fprs;
69
70	if (bp->sjs_flags & JB_SAVEMASK) {
71		uc.uc_flags |= UC_SIGMASK;
72		uc.uc_sigmask = bp->sjs_sigmask;
73	}
74
75	if (val)
76		reg[REG_O0] = (greg_t)val;
77	else
78		reg[REG_O0] = (greg_t)1;
79
80	/*
81	 * Copy the fp and i7 values into the register window save area.
82	 * These may have been clobbered between calls to sigsetjmp
83	 * and siglongjmp.  For example, the save area could have been
84	 * relocated to lower addresses and the original save area
85	 * given to an alloca() call.  Notice that all reads from
86	 * the sigjmp_struct_t buffer should take place before the
87	 * following two writes.  It is possible that user code may
88	 * move/copy the sigjmpbuf around, and overlap the original
89	 * register window save area.
90	 */
91	if (bp->sjs_sp != 0 && (bp->sjs_flags & JB_FRAMEPTR)) {
92		struct frame *sp = (struct frame *)(bp->sjs_sp + STACK_BIAS);
93		sp->fr_savfp = (struct frame *)fp;
94		sp->fr_savpc = i7;
95	}
96
97	(void) setcontext(&uc);
98}
99