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, 47 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/csky/clone.c b/libc/sysdeps/linux/csky/clone.c
new file mode 100644
index 000000000..97c30d027
--- /dev/null
+++ b/libc/sysdeps/linux/csky/clone.c
@@ -0,0 +1,47 @@
+#include <stdarg.h>
+#include <sysdep.h>
+#include <unistd.h>
+
+extern int __syscall_error(int err_no);
+
+extern int __csky_clone (
+  int flags,
+  void *child_stack,
+  pid_t *ptid,
+  pid_t *ctid,
+  void *tls);
+
+int __clone(
+  int (*fn)(void *),
+  void *child_stack,
+  int flags,
+  void *arg, ...)
+{
+  void *ptid;
+  void *tls;
+  void *ctid;
+  va_list al;
+  int err;
+
+  va_start(al, arg);
+  ptid = va_arg(al, void *);
+  tls = va_arg(al, void *);
+  ctid = va_arg(al, void *);
+  va_end(al);
+
+  err = EINVAL;
+  if (!fn)
+    goto err;
+  if (!child_stack)
+    goto err;
+
+  /* prepare fn&arg in child_stack */
+  child_stack = (void *)((unsigned int)child_stack - 8);
+  *(unsigned int *)child_stack = (unsigned int)fn;
+  *(unsigned int *)(child_stack + 4) = (unsigned int)arg;
+
+  return __csky_clone(flags, child_stack, ptid, ctid, tls);
+err:
+  return __syscall_error(-err);
+}
+weak_alias(__clone, clone)