8609 want a position independent CRT

Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Patrick Mooney <patrick.mooney@joyent.com>
Reviewed by: Albert Lee <trisk@forkgnu.org>
Approved by: Dan McDonald <danmcd@joyent.com>

7 files changed, 365 insertions, 0 deletions

diff --git a/usr/src/lib/crt/common/common-crt.c b/usr/src/lib/crt/common/common-crt.c
new file mode 100644
index 0000000000..5598c1f6fa
--- /dev/null
+++ b/usr/src/lib/crt/common/common-crt.c
@@ -0,0 +1,100 @@
+/*
+ * 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.
+ */
+
+/*
+ * 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 void _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;
+
+	if (&_start_crt_compiler != NULL)
+		_start_crt_compiler(argc, argv);
+
+#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);
+}
diff --git a/usr/src/lib/crt/common/values-Xa.c b/usr/src/lib/crt/common/values-Xa.c
new file mode 100644
index 0000000000..041a6dc8b0
--- /dev/null
+++ b/usr/src/lib/crt/common/values-Xa.c
@@ -0,0 +1,43 @@
+/*
+ * 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;
diff --git a/usr/src/lib/crt/common/values-Xc.c b/usr/src/lib/crt/common/values-Xc.c
new file mode 100644
index 0000000000..ef70ae97a7
--- /dev/null
+++ b/usr/src/lib/crt/common/values-Xc.c
@@ -0,0 +1,43 @@
+/*
+ * 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;
diff --git a/usr/src/lib/crt/common/values-Xs.c b/usr/src/lib/crt/common/values-Xs.c
new file mode 100644
index 0000000000..b876d90724
--- /dev/null
+++ b/usr/src/lib/crt/common/values-Xs.c
@@ -0,0 +1,45 @@
+/*
+ * 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;
diff --git a/usr/src/lib/crt/common/values-Xt.c b/usr/src/lib/crt/common/values-Xt.c
new file mode 100644
index 0000000000..b876d90724
--- /dev/null
+++ b/usr/src/lib/crt/common/values-Xt.c
@@ -0,0 +1,45 @@
+/*
+ * 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;
diff --git a/usr/src/lib/crt/common/values-xpg4.c b/usr/src/lib/crt/common/values-xpg4.c
new file mode 100644
index 0000000000..54b5afc883
--- /dev/null
+++ b/usr/src/lib/crt/common/values-xpg4.c
@@ -0,0 +1,34 @@
+/*
+ * 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;
diff --git a/usr/src/lib/crt/common/values-xpg6.c b/usr/src/lib/crt/common/values-xpg6.c
new file mode 100644
index 0000000000..2e9e64efc2
--- /dev/null
+++ b/usr/src/lib/crt/common/values-xpg6.c
@@ -0,0 +1,55 @@
+/*
+ * 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;