crt - zygaena/hammerhead

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crt Plain Text 777 lines 22.1 KB
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License, Version 1.0 only
# (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 2004 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#

include	../Makefile.lib

# Hammerhead: amd64-only
SUBDIRS = $(MACH64)

all :		TARGET= all
install :	TARGET= install
clean :	TARGET= clean
clobber :	TARGET= clobber

.KEEP_STATE:

all install clean clobber: $(SUBDIRS)

$(SUBDIRS):	FRC
	@cd $@; pwd; $(MAKE) $(TARGET)

FRC:
#
# 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 2006 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# Copyright 2019 Joyent, Inc.
#

CRTI = crti.o
CRTN = crtn.o
CRT1 = crt1.o
VALUES = values-Xa.o values-Xc.o values-Xs.o values-Xt.o \
		values-xpg4.o values-xpg6.o
COMMON_CRT = common-crt.o
MACH_CRT = mach-crt1.o

# include library definitions
include ../../Makefile.lib

SRCS = $(VALUES:%.o=../common/%.c) $(COMMON_CRT:%.o=../common/%.c)

POST_PROCESS_O = $(PROCESS_COMMENT) $@ ; $(STRIP) -x $@

OBJECTS = $(VALUES) $(CRT1) $(CRTI) $(CRTN)

ROOTLIB=	$(ROOT)/usr/lib
# Hammerhead: flattened — no amd64 subdir
ROOTLIB64=	$(ROOTLIB)
ROOTOBJECTS=	$(OBJECTS:%=$(ROOTLIB)/%)
ROOTOBJECTS64=	$(OBJECTS:%=$(ROOTLIB64)/%)

# Hammerhead: amd64-only
ROOTOBJECTS64 += $(ROOTLIB64)/gcrt1.o

ASFLAGS +=	-D_ASM -DPIC $(AS_PICFLAGS)
ASFLAGS64 +=	-D_ASM -DPIC $(AS_PICFLAGS)

# Hammerhead: GNU Make target-specific variable syntax (was dmake := syntax)
values-xpg6.o: CPPFLAGS += -I$(SRC)/lib/libc/inc
$(COMMON_CRT) $(VALUES): CFLAGS += $(C_PICFLAGS)
$(COMMON_CRT) $(VALUES): CFLAGS64 += $(C_PICFLAGS64)

# intentional double exit
SMOFF += unreachable

COMPATLINKS=	usr/ccs/lib/values-Xa.o \
		usr/ccs/lib/values-Xc.o \
		usr/ccs/lib/values-Xs.o \
		usr/ccs/lib/values-Xt.o \
		usr/ccs/lib/values-xpg4.o \
		usr/ccs/lib/values-xpg6.o

# Hammerhead: flattened layout — no amd64 subdir
COMPATLINKS64=	$(COMPATLINKS)

$(ROOT)/usr/ccs/lib/values-Xa.o:	COMPATLINKTARGET=../../lib/values-Xa.o
$(ROOT)/usr/ccs/lib/values-Xc.o:	COMPATLINKTARGET=../../lib/values-Xc.o
$(ROOT)/usr/ccs/lib/values-Xs.o:	COMPATLINKTARGET=../../lib/values-Xs.o
$(ROOT)/usr/ccs/lib/values-Xt.o:	COMPATLINKTARGET=../../lib/values-Xt.o
$(ROOT)/usr/ccs/lib/values-xpg4.o:	COMPATLINKTARGET=../../lib/values-xpg4.o
$(ROOT)/usr/ccs/lib/values-xpg6.o:	COMPATLINKTARGET=../../lib/values-xpg6.o

.KEEP_STATE:

all:	$(OBJECTS)

clean clobber:
	$(RM) $(OBJECTS)


$(CRT1): $(COMMON_CRT) $(MACH_CRT)
	$(LD) -r $(MACH_CRT) $(COMMON_CRT) -o $(CRT1)

%.o:	../common/%.c
	$(COMPILE.c) -o $@ $<
	$(POST_PROCESS_O)

%.o:	%.s
	$(COMPILE.s) -o $@ $<
	$(POST_PROCESS_O)

%.o:	../$(MACH)/%.s
	$(COMPILE.s) -o $@ $<
	$(POST_PROCESS_O)

# install rule for ROOTOBJECTS and ROOTOBJECTS64
# Hammerhead: ROOTLIB64 = ROOTLIB (flattened), use single set of rules
$(ROOTLIB)/%.o: %.o
	$(INS.file)

$(ROOTLIB)/gcrt1.o:
	$(RM) $(ROOTLIB)/gcrt1.o; $(SYMLINK) crt1.o $(ROOTLIB)/gcrt1.o

$(ROOTCOMPATLINKS) $(ROOTCOMPATLINKS64):
	$(RM) $@; $(SYMLINK) $(COMPATLINKTARGET) $@
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License, Version 1.0 only
# (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 2004 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#

include ../Makefile.com
include ../../Makefile.lib.64

install:	$(ROOTOBJECTS64) $(ROOTCOMPATLINKS64)
/*
 * 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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

	.file	"crti.s"
	.ident	""

/*
 * These crt*.o modules are provided as the bare minimum required
 * from a crt*.o for inclusion in building low level system
 * libraries.  The are only be to included in libraries which
 * contain *no* C++ code and want to avoid the startup code
 * that the C++ runtime has introduced into the crt*.o modules.
 *
 * For further details - see bug#4433015
 */

/*
 * _init function prologue
 */
	.section	.init,"ax"
	.globl	_init
	.type	_init,@function
	.align	16
_init:
	pushq	%rbp
	movq	%rsp, %rbp

/*
 * _fini function prologue
 */
	.section	.fini,"ax"
	.globl	_fini
	.type	_fini,@function
	.align	16
_fini:
	pushq	%rbp
	movq	%rsp, %rbp
/*
 * 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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

	.file	"crtn.s"
	.ident	""

/*
 * These crt*.o modules are provided as the bare minimum required
 * from a crt*.o for inclusion in building low level system
 * libraries.  The are only be to included in libraries which
 * contain *no* C++ code and want to avoid the startup code
 * that the C++ runtime has introduced into the crt*.o modules.
 *
 * For further details - see bug#4433015
 */

/*
 * _init function epilogue
 */
	.section	.init,"ax"
	leave
	ret

/*
 * _fini function epilogue
 */
	.section	.fini,"ax"
	leave
	ret
/*
 * 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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/asm_linkage.h>

	.file	"mach-crt1.S"
	.ident	""

	.global	_start_crt

/*
 *   The SVR4/amd64 ABI (pages 3-29) says that when the entry
 *   point runs registers' %rbp, %rsp, %rdx values are specified
 *   the following:
 *
 *	%rbp The content of this register is unspecified at
 *		process initialization time, but the user code should mark
 *		the deepest stack frame by setting the frame pointer to zero.
 *		No other frame's %ebp should have a zero value.
 *
 *	%rsp Performing its usual job, the stack pointer holds the address
 *	of the bottom of the stack, which is guaranteed to be
 *	quadword aligned.
 *
 *		The stack contains the arguments and environment:
 *	  ...
 *	  envp[0]		(16+(8*argc))(%rsp)
 *	  NULL			(8+(8*argc))(%rsp)
 *	  ...
 *	  argv[0]		8(%rsp)
 *	  argc			0(%rsp)
 *
 *	%rdx In a conforming program, this register contains a function
 *		pointer that the application should register with atexit(BA_OS).
 *		This function is used for shared object termination code
 *		[see Dynamic Linking in Chapter 5 of the System V ABI].
 *
 */

ENTRY_NP(_start)
/*
 * Allocate a NULL return address and a NULL previous %rbp as if
 * there was a genuine call to _start.
 */
	pushq	$0
	pushq	$0
	movq	%rsp,%rbp		/* The first stack frame */

/*
 * The stack now is
 *
 *	  envp[0]		(32+(8*argc))(%rsp)	 - (A)
 *	  NULL			(24+(8*argc))(%rsp)
 *	  ...
 *	  argv[0]		24(%rbp)		 - (B)
 *	  argc			16(%rbp)
 *	  0			8(%rbp)
 *	  0			0(%rbp)
 */

	andq	$-16,%rsp		/* align the stack */
	movq	16(%rbp),%rdi		/* argc */
	leaq	24(%rbp),%rsi		/* argv */
	/* NB: rt_do_exit, if applicable, is already in %rdx */
	call	_start_crt
	hlt
SET_SIZE(_start)

/*
 * The following is here in case any object module compiled with cc -p
 *	was linked into this module.
 */
ENTRY_NP(_mcount)
	.weak	_mcount
	ret
SET_SIZE(_mcount)
/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2016, Richard Lowe.
 * Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
 */

/*
 * That of the CRT startup routine which itself may be implemented in C.
 */

#include <sys/feature_tests.h>
#include <sys/types.h>

#include <stdlib.h>
#include <synch.h>
#include <unistd.h>

#pragma weak _DYNAMIC
extern uintptr_t _DYNAMIC;

#pragma weak environ = _environ
char **_environ = NULL;
char **___Argv = NULL;

extern int main(int argc, char **argv, char **envp);
extern void _init(void);
extern void _fini(void);

#pragma weak __start_crt_compiler
extern int __start_crt_compiler(int argc, char **argv);

#if defined(__x86)
int __longdouble_used = 0;
extern void __fpstart(void);
#endif

#if defined(__i386)		/* Not amd64 */
#pragma weak __fsr_init_value
extern long __fsr_init_value;
extern void __fsr(uintptr_t);
#endif


/*
 * Defined here for ABI reasons, must match the definition in libc.
 * If it cannot, a new symbol must be created.
 */
mutex_t __environ_lock = DEFAULTMUTEX;

void
_start_crt(int argc, char **argv, void (*exit_handler)(void))
{
	int ret = 0;

	/*
	 * On x86, we check whether we're a dynamic executable to see whether
	 * we'll receive an exit_handler.
	 *
	 * On SPARC, we just need to check whether the handler was NULL.
	 */
#if defined(__x86)
	if (&_DYNAMIC != NULL)
		(void) atexit(exit_handler);
#elif defined(__sparc)
	if (exit_handler != NULL)
		(void) atexit(exit_handler);
#endif

	(void) atexit(_fini);

	_environ = argv + (argc + 1);
	___Argv = argv;

	/*
	 * __start_crt_compiler() provides a hook for compilers to perform
	 * extra initialisation before main() is called. For example, gcc uses
	 * this to initialise profiling code for objects built with its -pg
	 * option by linking in an extra object that provides this function.
	 *
	 * This mechanism replaces the earlier separate gcrt1.o.
	 *
	 * If __start_crt_compiler() returns a non-zero value, then the
	 * process will exit with that value, without main() being called.
	 */
	if (&__start_crt_compiler != NULL)
		ret = __start_crt_compiler(argc, argv);

	if (ret == 0) {
#if defined(__x86)
		__fpstart();
#endif
#if defined(__i386)		/* Not amd64 */
		/*
		 * Note that Studio cc(1) sets the _value of the symbol_, that
		 * is, its address.  Not the value _at_ that address.
		 */
		__fsr((uintptr_t)&__fsr_init_value);
#endif
		_init();
		ret = main(argc, argv, _environ);
	}
	exit(ret);
	_exit(ret);
}
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1988 AT&T	*/
/*	  All Rights Reserved  	*/


#include <sys/types.h>
#include <math.h>

/*
 * variables which differ depending on the
 * compilation mode
 *
 * ANSI conforming mode
 * This file is linked into the a.out immediately following
 * the startup routine if the -Xa compilation mode is selected
 */

const enum version _lib_version = ansi_1;
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1988 AT&T	*/
/*	  All Rights Reserved  	*/


#include <sys/types.h>
#include <math.h>

/*
 * variables which differ depending on the
 * compilation mode
 *
 * Strict ANSI mode
 * This file is linked into the a.out immediately following
 * the startup routine if the -Xc compilation mode is selected
 */

const enum version _lib_version = strict_ansi;
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1988 AT&T	*/
/*	  All Rights Reserved  	*/


#include <sys/types.h>
#include <math.h>

/*
 * variables which differ depending on the
 * compilation mode
 *
 * C Issue 4.2 compatibility mode
 * This file is linked into the a.out by default if
 * no compilation mode was specified or if the -Xt option
 * was specified - the linking occurs if there is an unresolved
 * reference to _lib_version
 */

const enum version _lib_version = c_issue_4;
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1988 AT&T	*/
/*	  All Rights Reserved  	*/


#include <sys/types.h>
#include <math.h>

/*
 * variables which differ depending on the
 * compilation mode
 *
 * C Issue 4.2 compatibility mode
 * This file is linked into the a.out by default if
 * no compilation mode was specified or if the -Xt option
 * was specified - the linking occurs if there is an unresolved
 * reference to _lib_version
 */

const enum version _lib_version = c_issue_4;
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
/*
 * Setting thie value to 1 enables XPG4 mode for APIs
 * which have differing runtime behaviour from XPG3 to XPG4.
 * See usr/src/lib/libc/port/gen/xpg4.c for the default value.
 */

int __xpg4 = 1;
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * __xpg6 (C99/SUSv3) was first introduced in Solaris 10.
 *
 * This file is NOT linked into libc.  See xpg6.c.
 * This value is linked into an application when the application is
 * requesting conforming C99/SUSv3 behavior.  This is usually done
 * with the c99 utility.
 *
 * __xpg6 is used to control certain behaviors between the C99 standard,
 * the SUSv3 standard, and Solaris.  More explanation in inc/xpg6.h.
 * The XPG6 C compiler utility (c99) will add an object file that contains an
 * alternate definition for __xpg6.  The symbol interposition provided
 * by the linker will allow libc to find that symbol instead.
 *
 * Possible settings are available and documented in inc/xpg6.h.
 */

/*
 * This setting enables strictly conforming C99/SUSv3 behavior.
 */

#include "xpg6.h"

unsigned int __xpg6 = _C99SUSv3_mode_ON;

/*
 * Also turn on XPG4 mode.
 */
int __xpg4 = 1;