From 2fcffe26e815b7125a357c83b59617ab93c16b41 Mon Sep 17 00:00:00 2001
From: Guo Ren <ren_guo@c-sky.com>
Date: Sun, 15 Oct 2017 20:59:34 +0800
Subject: csky: port to uclibc-ng

Follow the steps to build c-sky uclibc linux system:
1. git clone https://github.com/c-sky/buildroot.git
2. cd buildroot
3. make qemu_csky_ck810_uclibc_defconfig
4. make

Follow the buildroot/board/qemu/csky/readme.txt to run.

This buildroot toolchain is pre-build, But you can rebuild
the c-sky uclibc-ng alone and install it to the buildroot
sysroot manually.

We'll try our best to improve the uclibc-ng continuously.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
 libc/sysdeps/linux/csky/crt1.S | 95 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 libc/sysdeps/linux/csky/crt1.S

(limited to 'libc/sysdeps/linux/csky/crt1.S')

diff --git a/libc/sysdeps/linux/csky/crt1.S b/libc/sysdeps/linux/csky/crt1.S
new file mode 100644
index 000000000..ae73843fb
--- /dev/null
+++ b/libc/sysdeps/linux/csky/crt1.S
@@ -0,0 +1,95 @@
+#include <sysdep.h>
+
+ .text
+.global	_start
+.type   _start,%function
+.global __exit
+.global atexit
+
+.global _init
+.global _fini
+
+.global main
+.global __uClibc_main
+
+/*
+ * argc, argv and envp are on the stack
+ *
+ * Call:
+ * void __uClibc_main(
+ *         int (*main)(int, char **, char **),
+ *         int argc,
+ *         char **argv,
+ *         void (*app_init)(void),
+ *         void (*app_fini)(void),
+ *         void (*rtld_fini)(void),
+ *         void *stack_end attribute_unused);
+ */
+
+_start:
+#ifdef __PIC__
+	__GET_GB
+	lrw	a0, main@GOT
+	addu	a0, gb
+	ldw	a0, (a0)
+
+	ldw	a1, (sp)
+	mov	a2, sp
+	addi	a2, 4
+
+	mov	a3, sp /* push stack_end */
+	subi	sp, 8
+	stw	a3, (sp)
+
+	lrw	a3, _init@GOT
+	addu	a3, gb
+	ldw	a3, (a3)
+
+#ifdef __CSKYABIV2__
+	subi	sp, 8
+	lrw	l4, _fini@GOT
+	addu	l4, gb
+	ldw	l4, (l4)
+	stw	l4, (sp)
+
+	stw	r7, (sp, 4) /* push rtld_fini */
+#else
+	lrw	a4, _fini@GOT
+	addu	a4, gb
+	ldw	a4, (a4)
+#endif
+
+	lrw	l4,  __uClibc_main@PLT
+	addu	l4, gb
+	ldw	l4, (l4)
+	jsr	l4
+
+#else /* __PIC__ */
+	lrw	a0, main
+
+	ldw	a1, (sp)
+	mov	a2, sp
+	addi	a2, 4
+
+	mov	a3, sp     /* push stack_end */
+	subi	sp, 8
+	stw	a3, (sp)
+
+	lrw	a3, _init
+#ifdef __CSKYABIV2__
+	subi	sp, 8
+	lrw	l4, _fini
+	stw	l4, (sp)
+	stw	r7, (sp, 4)
+#else
+	lrw	a4, _fini
+#endif
+
+	lrw	l4, __uClibc_main
+	jsr	l4
+#endif /* __PIC__ */
+	bsr	__exit
+__exit:
+	DO_CALL(exit, 0)
+	br .
+
-- 
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