xref: /illumos-gate/usr/src/lib/libc/inc/sigjmp_struct.h (revision 6a8fa7ea)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#ifndef _SIGJMP_STRUCT_H
#define	_SIGJMP_STRUCT_H

#ifdef	__cplusplus
extern "C" {
#endif

#include <sys/types.h>
#include <sys/stack.h>
#include <sys/sysmacros.h>
#include <ucontext.h>
#include <setjmp.h>

#if defined(__sparc)

/*
 * The following structure MUST match the ABI size specifier _SIGJBLEN.
 * This is 19 (longs).  The ABI value for _JBLEN is 12 (longs).
 * A greg_t is a long.  A sigset_t is 4 ints and a stack_t is 3 longs.
 *
 * The layout of this structure must match the layout of the same
 * structures defined in usr/src/lib/libbc/libc/sys/common/ucontext.h
 * and usr/src/ucblib/libucb/sparc/sys/setjmp.c.  Other than that,
 * the layout is private, not known to applications.
 *
 * We make the first 5 members match the implementations of
 * setjmp()/longjmp(), so that an application could (stupidly)
 * do sigsetjmp(env) followed by longjmp(env) (but not setjmp(env)
 * followed by siglongjmp(env)).
 */
typedef struct {
	int		sjs_flags;	/* JBUF[ 0]	*/
	greg_t		sjs_sp;		/* JBUF[ 1]	*/
	greg_t		sjs_pc;		/* JBUF[ 2]	*/
	greg_t		sjs_fp;		/* JBUF[ 3]	*/
	greg_t		sjs_i7;		/* JBUF[ 4]	*/
	ucontext_t	*sjs_uclink;
	ulong_t		sjs_pad[_JBLEN - 6];
	sigset_t	sjs_sigmask;
#if defined(_LP64)
	greg_t		sjs_asi;
	greg_t		sjs_fprs;
#endif
	stack_t		sjs_stack;
} sigjmp_struct_t;

#define	JB_SAVEMASK	0x1
#define	JB_FRAMEPTR	0x2

#endif	/* __sparc */

#if defined(__amd64)
/*
 * The "sigjmp_buf" type is an array of long and thus can have 8-byte alignment
 * on AMD64 systems.  The "ucontext_t" type has a stricter 16-byte alignment
 * requirement, so we must round the pointer up when casting.
 *
 * This is not required on other architectures:
 *  - SPARC does not store the ucontext_t in the sigjmp_buf
 *  - i386 only requires 4-byte alignment for ucontext_t
 */
#define	SIGJMP2UCONTEXT(x)	\
	((ucontext_t *)P2ROUNDUP((uintptr_t)(x),  sizeof (upad128_t)))
#endif

#ifdef	__cplusplus
}
#endif

#endif /* _SIGJMP_STRUCT_H */