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>

1 files changed, 168 insertions, 0 deletions

diff --git a/libc/string/csky/cskyv2/abiv2_strcmp.S b/libc/string/csky/cskyv2/abiv2_strcmp.S
new file mode 100644
index 000000000..202da7c8a
--- /dev/null
+++ b/libc/string/csky/cskyv2/abiv2_strcmp.S
@@ -0,0 +1,168 @@
+#include <endian.h>
+#include "macro.S"
+
+#ifdef WANT_WIDE
+# define Wstrcmp wcscmp
+# define Wstrcoll wcscoll
+#else
+# define Wstrcmp strcmp
+# define Wstrcoll strcoll
+#endif
+
+/* FIXME attention!!! it may be a bug when WANT_WIDE define */
+/*libc_hidden_proto(Wstrcmp)*/
+	.align 2
+	.global Wstrcmp
+	.type   Wstrcmp, @function
+Wstrcmp:
+    mov        a3, a0
+
+    or         a0, a1
+    andi       a0, 0x3
+    M_BNEZ     a0, 4f
+    1:                   // if aligned, load word each time.
+
+    ldw        a0, (a3, 0)
+    ldw        t0, (a1, 0)
+    M_BNE      a0, t0, 1f // if d[i] != s[i], goto 1f
+    tstnbz     a0       // if d[i] == s[i], check if d or s is at the end.
+    bf         3f       // if at the end, goto 3f (finish comparing)
+    ldw        a0, (a3, 4)
+    ldw        t0, (a1, 4)
+    M_BNE      a0, t0, 1f
+    tstnbz     a0
+    bf         3f
+
+    ldw        a0, (a3, 8)
+    ldw        t0, (a1, 8)
+    M_BNE      a0, t0, 1f
+    tstnbz     a0
+    bf         3f
+
+    ldw        a0, (a3, 12)
+    ldw        t0, (a1, 12)
+    M_BNE      a0, t0, 1f
+    tstnbz     a0
+    bf         3f
+
+    ldw        a0, (a3, 16)
+    ldw        t0, (a1, 16)
+    M_BNE      a0, t0, 1f
+    tstnbz     a0
+    bf         3f
+
+    ldw        a0, (a3, 20)
+    ldw        t0, (a1, 20)
+    M_BNE      a0, t0, 1f
+    tstnbz     a0
+    bf         3f
+
+    ldw        a0, (a3, 24)
+    ldw        t0, (a1, 24)
+    M_BNE      a0, t0, 1f
+    tstnbz     a0
+    bf         3f
+
+    ldw        a0, (a3, 28)
+    ldw        t0, (a1, 28)
+    M_BNE      a0, t0, 1f
+    tstnbz     a0
+    bf         3f
+
+    addi       a3, 32
+    addi       a1, 32
+    br         1b
+
+#ifdef __CSKYBE__
+    /* d[i] != s[i] in word, so we check byte 0 ? */
+    1:
+    xtrb0      t1, a0
+    mov        a2, t1
+    xtrb0      t1, t0
+    M_BNE      a2, t1, 2f
+    cmpnei     a2, 0
+    bf         2f
+
+    /* d[i] != s[i] in word, so we check byte 1 ? */
+    xtrb1      t1, a0
+    mov        a2, t1
+    xtrb1      t1, t0
+    M_BNE      a2, t1, 2f
+    cmpnei     a2, 0
+    bf         2f
+
+    /* d[i] != s[i] in word, so we check byte 1 ? */
+    xtrb2      t1, a0
+    mov        a2, t1
+    xtrb2      t1, t0
+    M_BNE      a2, t1, 2f
+    cmpnei     a2, 0
+    bf         2f
+
+    /* d[i] != s[i] in word, so we check byte 1 ? */
+    xtrb3      t1, a0
+    mov        a2, t1
+    xtrb3      t1, t0
+
+#else /* little endian */
+    /* d[i] != s[i] in word, so we check byte 0 ? */
+    1:
+    xtrb3      t1, a0
+    mov        a2, t1
+    xtrb3      t1, t0
+    M_BNE      a2, t1, 2f
+    cmpnei     a2, 0
+    bf         2f
+
+    /* d[i] != s[i] in word, so we check byte 1 ? */
+    xtrb2      t1, a0
+    mov        a2, t1
+    xtrb2      t1, t0
+    M_BNE      a2, t1, 2f
+    cmpnei     a2, 0
+    bf         2f
+
+    /* d[i] != s[i] in word, so we check byte 1 ? */
+    xtrb1      t1, a0
+    mov        a2, t1
+    xtrb1      t1, t0
+    M_BNE      a2, t1, 2f
+    cmpnei     a2, 0
+    bf         2f
+
+    /* d[i] != s[i] in word, so we check byte 1 ? */
+    xtrb0      t1, a0
+    mov        a2, t1
+    xtrb0      t1, t0
+
+#endif
+    /* get the result when d[i] != s[i] */
+    2:
+    subu       a2, t1
+    mov        a0, a2
+    jmp        r15
+
+    /* return when d[i] == s[i] */
+    3:
+    subu       a0, t0
+    jmp        r15
+
+     /* cmp when d or s is not aligned */
+    4:
+    ldb       a0, (a3,0)
+    ldb       t0, (a1, 0)
+    M_BNE     a0, t0, 3b
+    addi      a1, 1
+    addi      a3, 1
+    M_BNEZ    a0, 4b
+    jmp        r15
+
+    .size   Wstrcmp, .-Wstrcmp
+
+libc_hidden_def(Wstrcmp)
+.weak Wstrcmp
+#ifndef __UCLIBC_HAS_LOCALE__
+/* libc_hidden_proto(Wstrcoll) */
+strong_alias(Wstrcmp,Wstrcoll)
+libc_hidden_def(Wstrcoll)
+#endif