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/string/csky/cskyv2/abiv2_strcpy.S | 129 +++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 libc/string/csky/cskyv2/abiv2_strcpy.S

(limited to 'libc/string/csky/cskyv2/abiv2_strcpy.S')

diff --git a/libc/string/csky/cskyv2/abiv2_strcpy.S b/libc/string/csky/cskyv2/abiv2_strcpy.S
new file mode 100644
index 000000000..20262feae
--- /dev/null
+++ b/libc/string/csky/cskyv2/abiv2_strcpy.S
@@ -0,0 +1,129 @@
+#include <endian.h>
+#include "macro.S"
+
+#ifdef WANT_WIDE
+# define Wstrcpy wcscpy
+#else
+# define Wstrcpy strcpy
+#endif
+
+	.align 2
+	.global Wstrcpy
+	.type   Wstrcpy, @function
+Wstrcpy:
+
+        mov     a3, a0
+        or      a2, a1, a3
+        andi    t0, a2, 3
+        M_BEZ   t0, 2f
+        mov     t0, a1
+       1:
+        ld.b    a2, (t0)
+        stb     a2, (a3)
+        addi    t0, t0, 1
+        addi    a3, a3, 1
+        M_BNEZ  a2, 1b
+
+        jmp     r15
+
+       2:
+        ldw     a2, (a1)
+        tstnbz  a2
+        bf      11f
+        stw     a2, (a3)
+
+        ldw     a2, (a1, 4)
+        tstnbz  a2
+        bf      4f
+        stw     a2, (a3, 4)
+
+        ldw     a2, (a1, 8)
+        tstnbz  a2
+        bf      5f
+        stw     a2, (a3, 8)
+
+        ldw     a2, (a1, 12)
+        tstnbz  a2
+        bf      6f
+        stw     a2, (a3, 12)
+
+        ldw     a2, (a1, 16)
+        tstnbz  a2
+        bf      7f
+        stw     a2, (a3, 16)
+
+        ldw     a2, (a1, 20)
+        tstnbz  a2
+        bf      8f
+        stw     a2, (a3, 20)
+
+        ldw     a2, (a1, 24)
+        tstnbz  a2
+        bf      9f
+        stw     a2, (a3, 24)
+
+        ldw     a2, (a1, 28)
+        tstnbz  a2
+        bf      10f
+        stw     a2, (a3, 28)
+
+        addi     a3, 32
+        addi     a1, 32
+        br       2b
+
+       4:
+        addi    a3, 4
+        br      11f
+
+       5:
+        addi    a3, 8
+        br      11f
+
+       6:
+        addi    a3, 12
+        br      11f
+
+       7:
+        addi    a3, 16
+        br      11f
+
+       8:
+        addi    a3, 20
+        br      11f
+
+       9:
+        addi    a3, 24
+        br      11f
+
+       10:
+        addi    a3, 28
+       11:
+#ifdef __CSKYBE__
+        xtrb0   t0, a2
+        st.b    t0, (a3)
+        M_BEZ   t0, 5f
+        xtrb1   t0, a2
+        st.b    t0, (a3, 1)
+        M_BEZ   t0, 5f
+        xtrb2   t0, a2
+        st.b    t0, (a3, 2 )
+        M_BEZ   t0, 5f
+        stw     a2, (a3)
+#else
+        xtrb3   t0, a2
+        st.b    t0, (a3)
+        M_BEZ   t0, 5f
+        xtrb2   t0, a2
+        st.b    t0, (a3, 1)
+        M_BEZ   t0, 5f
+        xtrb1   t0, a2
+        st.b    t0, (a3, 2)
+        M_BEZ   t0, 5f
+        stw     a2, (a3)
+#endif
+       5:
+	jmp     r15
+
+
+libc_hidden_def(Wstrcpy)
+.weak Wstrcpy
-- 
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