initial import

2019-12-07 18:43:38 +01:00
commit 5ee501eec5
4 changed files with 100 additions and 0 deletions
--- a/startup.S
+++ b/startup.S
@@ -0,0 +1,22 @@
+		.extern	_main
+		.globl 	_program_length
+
+ 		.equ 	BASEPAGE_SIZE,0x100
+		
+		.text
+
+start:
+		move.l	4(sp),a5					| address to basepage
+		move.l	0x0c(a5),d0					| length of text segment
+		add.l	0x14(a5),d0					| length of data segment
+		add.l	0x1c(a5),d0					| length of bss segment
+		add.l	#BASEPAGE_SIZE,d0			| length of stackpointer+basepage
+		move.l	d0,_program_length			| save program length so _main() can access it
+	
+		jsr	_main							| make sure we never return here
+
+		.bss
+		
+_program_length:
+		ds.l	1
+