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, 113 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/csky/bits/syscalls.h b/libc/sysdeps/linux/csky/bits/syscalls.h
new file mode 100644
index 000000000..04d01f4ca
--- /dev/null
+++ b/libc/sysdeps/linux/csky/bits/syscalls.h
@@ -0,0 +1,113 @@
+#ifndef _BITS_SYSCALLS_H
+#define _BITS_SYSCALLS_H
+#ifndef _SYSCALL_H
+# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
+#endif
+
+#undef __NR_iopl
+#undef __NR_vm86
+
+/*
+   Some of the sneaky macros in the code were taken from
+   glibc-2.3.2/sysdeps/unix/sysv/linux/arm/sysdep.h
+*/
+
+//#include <errno.h>
+
+#define INLINE_SYSCALL_NCS(name, nr, args...)				\
+(__extension__								\
+  ({									\
+     unsigned int _inline_sys_result = INTERNAL_SYSCALL_NCS (name, , nr, args);\
+     if (unlikely (INTERNAL_SYSCALL_ERROR_P (_inline_sys_result, )))	\
+       {								\
+	 __set_errno (INTERNAL_SYSCALL_ERRNO (_inline_sys_result, ));	\
+	 _inline_sys_result = (unsigned int) -1;			\
+       }								\
+     (int) _inline_sys_result;						\
+   })									\
+)
+
+#undef INTERNAL_SYSCALL_NCS
+#ifndef __cskyabiv2__
+#define INTERNAL_SYSCALL_NCS(name, err, nr, args...)                        \
+  ({unsigned int __sys_result;                                          \
+     {                                                                  \
+       register int _a1 __asm__ ("a0"), _nr __asm__ ("r1");             \
+       LOAD_ARGS_##nr (args)                                            \
+       _nr = (name);                                             \
+       __asm__ __volatile__ ("trap  0 \n\t"                             \
+                             : "=r" (_a1)                               \
+                             : "r" (_nr) ASM_ARGS_##nr                  \
+                             : "memory");                               \
+               __sys_result = _a1;                                      \
+     }                                                                  \
+     (int) __sys_result; })
+
+#else /* __cskyabiv2__ */
+#define INTERNAL_SYSCALL_NCS(name, err, nr, args...)                        \
+  ({unsigned int __sys_result;                                          \
+     {                                                                  \
+       register int _a1 __asm__ ("a0"), _nr __asm__ ("r7");             \
+       LOAD_ARGS_##nr (args)                                            \
+       _nr = (name);                                             \
+       __asm__ __volatile__ ("trap  0    \n\t"                          \
+                             : "=r" (_a1)                               \
+                             : "r" (_nr) ASM_ARGS_##nr                  \
+                             : "memory");                               \
+               __sys_result = _a1;                                      \
+     }                                                                  \
+     (int) __sys_result; })
+#endif /* __ABI_CSKY_V2__ */
+
+#define INTERNAL_SYSCALL_ERROR_P(val, err) \
+  ((unsigned int) (val) >= 0xfffff001u)
+
+#define LOAD_ARGS_0()
+#define ASM_ARGS_0
+#define LOAD_ARGS_1(a1)                         \
+  _a1 = (int) (a1);                             \
+  LOAD_ARGS_0 ()
+#define ASM_ARGS_1      ASM_ARGS_0, "r" (_a1)
+#define LOAD_ARGS_2(a1, a2)                     \
+  register int _a2 __asm__ ("a1") = (int) (a2); \
+  LOAD_ARGS_1 (a1)
+#define ASM_ARGS_2      ASM_ARGS_1, "r" (_a2)
+#define LOAD_ARGS_3(a1, a2, a3)                 \
+  register int _a3 __asm__ ("a2") = (int) (a3); \
+  LOAD_ARGS_2 (a1, a2)
+#define ASM_ARGS_3      ASM_ARGS_2, "r" (_a3)
+#define LOAD_ARGS_4(a1, a2, a3, a4)             \
+  register int _a4 __asm__ ("a3") = (int) (a4); \
+  LOAD_ARGS_3 (a1, a2, a3)
+#define ASM_ARGS_4      ASM_ARGS_3, "r" (_a4)
+
+#ifndef __cskyabiv2__
+#define LOAD_ARGS_5(a1, a2, a3, a4, a5)         \
+  register int _v1 __asm__ ("a4") = (int) (a5); \
+  LOAD_ARGS_4 (a1, a2, a3, a4)
+#define ASM_ARGS_5      ASM_ARGS_4, "r" (_v1)
+#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6)     \
+  register int _v2 __asm__ ("a5") = (int) (a6); \
+  LOAD_ARGS_5 (a1, a2, a3, a4, a5)
+#define ASM_ARGS_6      ASM_ARGS_5, "r" (_v2)
+#define LOAD_ARGS_7(a1, a2, a3, a4, a5, a6, a7) \
+  register int _v3 __asm__ ("r8") = (int) (a7); \
+  LOAD_ARGS_6 (a1, a2, a3, a4, a5, a6)
+#define ASM_ARGS_7      ASM_ARGS_6, "r" (_v3)
+#else /* __cskyabiv2__ */
+#define LOAD_ARGS_5(a1, a2, a3, a4, a5)         \
+  register int _v1 __asm__ ("l0") = (int) (a5); \
+  LOAD_ARGS_4 (a1, a2, a3, a4)
+#define ASM_ARGS_5      ASM_ARGS_4, "r" (_v1)
+#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6)     \
+  register int _v2 __asm__ ("l1") = (int) (a6); \
+  LOAD_ARGS_5 (a1, a2, a3, a4, a5)
+#define ASM_ARGS_6      ASM_ARGS_5, "r" (_v2)
+#define LOAD_ARGS_7(a1, a2, a3, a4, a5, a6, a7) \
+  register int _v3 __asm__ ("l2") = (int) (a7); \
+  LOAD_ARGS_6 (a1, a2, a3, a4, a5, a6)
+#define ASM_ARGS_7      ASM_ARGS_6, "r" (_v3)
+#endif /* __ABI_CSKY_V2__ */
+
+
+#endif /* _BITS_SYSCALLS_H */