Added x86_64 glue code.

src/system/glue/arch/x86_64/Jamfile

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+SubDir HAIKU_TOP src system glue arch x86_64 ;
+
+KernelObjects
+	crti.S
+	crtn.S
+	;
+

src/system/glue/arch/x86_64/crti.S

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+/*
+ * Copyright 2005-2006, Axel Dörfler, axeld@pinc-software.de.
+ * Copyright 2012, Alex Smith, alex@alex-smith.me.uk.
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <asm_defs.h>
+
+
+/**	This file contains the first part of the ".init" and ".fini" sections in
+ *	the ELF executable.
+ *	The functions defined here will be called during initialization/termination
+ *	of the loaded executable/library. The ".init" and ".fini" sections are
+ *	stacked together like this:
+ *
+ *	crti.S		entry point
+ *				call to _init_before/_term_before
+ *	crtbegin.S	GCC specific: constructors/destructors are called, ...
+ *	crtend.S
+ *	crtn.S		call to _init_after/_term_after
+ *				exit
+ */
+
+
+.section .init
+FUNCTION(_init):
+	push	%rbp
+	movq	%rsp, %rbp
+
+	// Preserve image ID for call to __haiku_init_after.
+	push	%rdi
+
+	call	__haiku_init_before
+	// crtbegin.o stuff comes here
+
+.section .fini
+FUNCTION(_fini):
+	push	%rbp
+	movq	%rsp, %rbp
+	push	%rdi
+	call	__haiku_term_before
+	// crtend.o stuff comes here

src/system/glue/arch/x86_64/crtn.S

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+/*
+ * Copyright 2005-2006, Axel Dörfler, axeld@pinc-software.de.
+ * Copyright 2012, Alex Smith, alex@alex-smith.me.uk.
+ * Distributed under the terms of the MIT License.
+ */
+
+
+/**	This file contains the final part of the ".init" and ".fini" sections in
+ *	the ELF executable. It is tightly connected to crti.S.
+ *	Have a look at crti.S to find a description of what happens here.
+ */
+
+
+.section .init
+	// The image ID is preserved on the stack.
+	pop		%rdi
+	call	__haiku_init_after
+	movq	%rbp, %rsp
+	pop		%rbp
+	ret
+
+.section .fini
+	pop		%rdi
+	call	__haiku_term_after
+	movq	%rbp, %rsp
+	pop		%rbp
+	ret