glue: Add code for ARM64

This allows ARM64 to bootstrap for building of GCC.

Signed-off-by: Jaroslaw Pelczar <[email protected]>
Change-Id: Ia2ea34d1fc1a8e4d3c77a7ef05a32a8603a4fb51
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1851
Reviewed-by: waddlesplash <[email protected]>

src/system/glue/arch/arm64/crti.S

@@ -1,5 +1,5 @@
 /*
- * Copyright 2005, Axel Dörfler, axeld@pinc-software.de.
+ * Copyright 2019 Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  */
 
@@ -17,12 +17,16 @@
  *				exit
  */
 
-#define FUNCTION(x) .global x; .type x,%function; x
+#define FUNCTION(x) .globl x; .type _init, %function; x
 
-.section .init
+.section .init, "ax", @progbits
+.p2align 16
 FUNCTION(_init):
-	// crtbegin.o stuff comes here
+	sub		sp, sp, #16
+	str		lr, [sp]
 
-.section .fini
+.section .fini, "ax", @progbits
+.p2align 16
 FUNCTION(_fini):
-	// crtbegin.o stuff comes here
+	sub		sp, sp, #16
+	str		lr, [sp]

src/system/glue/arch/arm64/crtn.S

@@ -1,17 +1,14 @@
 /*
- * Copyright 2005, Axel Dörfler, axeld@pinc-software.de.
+ * Copyright 2019 Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  */
 
-/**	This file contains the final part of the ".init" and ".fini" sections in
+.section .init, "ax", @progbits
- *	the ELF executable. It is tightly connected to crti.S.
+	ldr		lr, [sp]
- *	Have a look at crti.S to find a description of what happens here.
+	add		sp, sp, #16
- */
+	ret
-
-.section .init
-	// the image ID and program args are still on the stack
-
-
-.section .fini
-	// the image ID and program args are still on the stack
 
+.section .fini, "ax", @progbits
+	ldr		lr, [sp]
+	add		sp, sp, #16
+	ret