Initial version of the CRIS port.

1 files changed, 41 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/cris/syscall-cris.c b/libc/sysdeps/linux/cris/syscall-cris.c
new file mode 100644
index 000000000..fa923ec9d
--- /dev/null
+++ b/libc/sysdeps/linux/cris/syscall-cris.c
@@ -0,0 +1,41 @@
+/* syscall.c - generalized linux system call interface */
+
+#include <stdarg.h>
+#include <syscall.h>
+#include <errno.h>
+
+/* perform a Linux/CRIS system call with variable number of arguments
+ * put them and the syscall number in the right registers and call
+ * break 13.
+ */
+
+int
+syscall(int number, ...)
+{
+	register long __a __asm__ ("r10");
+	register long __b __asm__ ("r11");
+	register long __c __asm__ ("r12");
+	register long __d __asm__ ("r13");
+	register long __e __asm__ ("r0");
+        va_list args;
+
+        va_start(args, number);
+        __a = va_arg(args, int);
+        __b = va_arg(args, int);
+        __c = va_arg(args, int);
+        __d = va_arg(args, int);
+        __e = va_arg(args, int);
+        va_end(args);
+
+        __asm__ volatile ("movu.w %1,$r9\n\tbreak 13\n\t"
+                : "=r" (__a)
+                : "g" (number), "0" (__a), "r" (__b), "r" (__c), "r" (__d),
+                          "r" (__e)
+                : "r10", "r9");
+
+        if (__a >= 0)
+		return __a;
+
+	errno = -__a;
+        return -1;
+}