removed pdclib, strange things were happening..., user shell kinda works now

rocklibc/include/syscall.h

@@ -0,0 +1,22 @@
+#ifndef RLIBC_SYSCALL_H
+#define RLIBC_SYSCALL_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+#define SYS_EXIT  1
+#define SYS_READ  3
+#define SYS_WRITE 4
+
+int write(int fd, const void *buf, size_t count);
+int read(int fd, void *buf, size_t count);
+int close(int fd);
+
+size_t lseek(int fd, size_t offset, int whence);
+
+void exit(int status) __attribute__((noreturn));
+
+void *sbrk(intptr_t increment);
+int brk(void *addr);
+
+#endif