Stop calling _init/_fini methods from crt1 for dynamic binaries. Do

call preinit, init and fini arrays methods from crt1 for static binaries.

Mark new crt1 with FreeBSD-specific ELF note.

Move some common crt1 code into new MI file ignore_init.c, to reduce
duplication.  Also, conservatively adjust nearby sources for style.

Reviewed by:	kan
Tested by:	andrew (arm), flo (sparc64)
MFC after:	3 weeks

2 files changed, 126 insertions, 15 deletions

diff --git a/lib/csu/common/crtbrand.c b/lib/csu/common/crtbrand.c
index 444d7f128729..04df686ba731 100644
--- a/lib/csu/common/crtbrand.c
+++ b/lib/csu/common/crtbrand.c
@@ -27,10 +27,7 @@
 __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
-
-#define ABI_VENDOR	"FreeBSD"
-#define ABI_SECTION	".note.ABI-tag"
-#define ABI_NOTETYPE	1
+#include "notes.h"
 
 /*
  * Special ".note" entry specifying the ABI version.  See
@@ -55,15 +52,15 @@ __FBSDID("$FreeBSD$");
  * These steps are done in the invididual Makefiles for each applicable arch.
  */
 static const struct {
-    int32_t	namesz;
-    int32_t	descsz;
-    int32_t	type;
-    char	name[sizeof ABI_VENDOR];
-    int32_t	desc;
-} abitag __attribute__ ((section (ABI_SECTION), aligned(4))) __used = {
-    sizeof ABI_VENDOR,
-    sizeof(int32_t),
-    ABI_NOTETYPE,
-    ABI_VENDOR,
-    __FreeBSD_version
+	int32_t	namesz;
+	int32_t	descsz;
+	int32_t	type;
+	char	name[sizeof(NOTE_FREEBSD_VENDOR)];
+	int32_t	desc;
+} abitag __attribute__ ((section (NOTE_SECTION), aligned(4))) __used = {
+	.namesz = sizeof(NOTE_FREEBSD_VENDOR),
+	.descsz = sizeof(int32_t),
+	.type = ABI_NOTETYPE,
+	.name = NOTE_FREEBSD_VENDOR,
+	.desc = __FreeBSD_version
 };
diff --git a/lib/csu/common/ignore_init.c b/lib/csu/common/ignore_init.c
new file mode 100644
index 000000000000..e3d2441936b3
--- /dev/null
+++ b/lib/csu/common/ignore_init.c
@@ -0,0 +1,114 @@
+/*-
+ * Copyright 2012 Konstantin Belousov <kib@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "notes.h"
+
+extern int main(int, char **, char **);
+
+extern void (*__preinit_array_start[])(int, char **, char **) __hidden;
+extern void (*__preinit_array_end[])(int, char **, char **) __hidden;
+extern void (*__init_array_start[])(int, char **, char **) __hidden;
+extern void (*__init_array_end[])(int, char **, char **) __hidden;
+extern void (*__fini_array_start[])(void) __hidden;
+extern void (*__fini_array_end[])(void) __hidden;
+extern void _fini(void) __hidden;
+extern void _init(void) __hidden;
+
+extern int _DYNAMIC;
+#pragma weak _DYNAMIC
+
+char **environ;
+const char *__progname = "";
+
+static void
+finalizer(void)
+{
+	void (*fn)(void);
+	size_t array_size, n;
+
+	array_size = __fini_array_end - __fini_array_start;
+	for (n = array_size; n > 0; n--) {
+		fn = __fini_array_start[n - 1];
+		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
+			(fn)();
+	}
+	_fini();
+}
+
+static inline void
+handle_static_init(int argc, char **argv, char **env)
+{
+	void (*fn)(int, char **, char **);
+	size_t array_size, n;
+
+	if (&_DYNAMIC != NULL)
+		return;
+
+	atexit(finalizer);
+
+	array_size = __preinit_array_end - __preinit_array_start;
+	for (n = 0; n < array_size; n++) {
+		fn = __preinit_array_start[n];
+		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
+			fn(argc, argv, env);
+	}
+	_init();
+	array_size = __init_array_end - __init_array_start;
+	for (n = 0; n < array_size; n++) {
+		fn = __init_array_start[n];
+		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
+			fn(argc, argv, env);
+	}
+}
+
+static inline void
+handle_progname(const char *v)
+{
+	const char *s;
+
+	__progname = v;
+	for (s = __progname; *s != '\0'; s++) {
+		if (*s == '/')
+			__progname = s + 1;
+	}
+}
+
+static const struct {
+	int32_t	namesz;
+	int32_t	descsz;
+	int32_t	type;
+	char	name[sizeof(NOTE_FREEBSD_VENDOR)];
+	uint32_t desc;
+} crt_noinit_tag __attribute__ ((section (NOTE_SECTION),
+    aligned(4))) __used = {
+	.namesz = sizeof(NOTE_FREEBSD_VENDOR),
+	.descsz = sizeof(uint32_t),
+	.type = CRT_NOINIT_NOTETYPE,
+	.name = NOTE_FREEBSD_VENDOR,
+	.desc = 0
+};