From 8a44a71f3d7094d0ccc632096edbe6a83bb0c51a Mon Sep 17 00:00:00 2001
From: Tormod Volden <debian.tormod@gmail.com>
Date: Sat, 28 May 2016 17:32:47 +0200
Subject: [PATCH] Library: Add stdio-free crt0 for 6809

Signed-off-by: Tormod Volden <debian.tormod@gmail.com>
---
 Library/libs/Makefile.6809      |  2 +-
 Library/libs/crt0nostdio_6809.s | 40 +++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 Library/libs/crt0nostdio_6809.s

diff --git a/Library/libs/Makefile.6809 b/Library/libs/Makefile.6809
index d965d8e7..81d3964f 100644
--- a/Library/libs/Makefile.6809
+++ b/Library/libs/Makefile.6809
@@ -11,7 +11,7 @@ ASM_OPT = -o
 KRN_HEADERS = userstructs.h
 KRN_HEADERS_SRC = $(addprefix ../../Kernel/include/,$(KRN_HEADERS))
 KRN_HEADERS_COPY = $(addprefix ../include/sys/,$(KRN_HEADERS))
-SRC_CRT0 = crt0_$(PLATFORM).s
+SRC_CRT0 = crt0_$(PLATFORM).s crt0nostdio_$(PLATFORM).s
 OBJ_CRT0 = $(SRC_CRT0:.s=.o)
 SRC_ASM = setjmp_6809.s ashlsi3_6809.s
 OBJ_ASM = $(SRC_ASM:.s=.o)
diff --git a/Library/libs/crt0nostdio_6809.s b/Library/libs/crt0nostdio_6809.s
new file mode 100644
index 00000000..844084a7
--- /dev/null
+++ b/Library/libs/crt0nostdio_6809.s
@@ -0,0 +1,40 @@
+		.module crt0
+
+		.globl _main
+		.globl _exit
+		.globl _environ
+		.globl ___argv
+
+		.area .header
+
+start:		jmp start2
+		.db 'F'
+		.db 'Z'
+		.db 'X'
+		.db '1'
+		.db __sectionbase_.header__/256	; page to load at
+		.dw 0				; chmem ("0 - 'all'")
+		.dw __sectionlen_.text__	; gives us code size info
+		.dw __sectionlen_.data__	; gives us data size info
+		.dw __sectionlen_.bss__		; bss size info
+		.dw 0			; spare
+
+		.area .text
+
+start2:
+		; we don't clear BSS since the kernel already did
+
+		; pass environ, argc and argv to main
+		; pointers and data stuffed above stack by execve()
+		leax 4,s
+		stx _environ
+		leax 2,s
+		stx ___argv
+		puls x			; argc
+		ldy #_exit		; return vector
+		pshs y
+		jmp _main		; go
+
+		.area .data
+
+_environ:	.dw 0
-- 
2.34.1