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

rocklibc/src/syscall.c

@@ -0,0 +1,37 @@
+#include <syscall.h>
+
+static inline int syscall1(int num, uint32_t arg1) {
+    int ret;
+    asm volatile (
+        "int $0x80"
+        : "=a"(ret)
+        : "a"(num), "b"(arg1)
+        : "memory"
+    );
+    return ret;
+}
+
+/* A generic wrapper for a system call with 3 arguments */
+static inline int syscall3(int num, uint32_t arg1, uint32_t arg2, uint32_t arg3) {
+    int ret;
+    asm volatile (
+        "int $0x80"
+        : "=a"(ret)
+        : "a"(num), "b"(arg1), "c"(arg2), "d"(arg3)
+        : "memory"
+    );
+    return ret;
+}
+
+void exit(int status) {
+    syscall1(SYS_EXIT, (uint32_t)status);
+    while(1);
+}
+
+int write(int fd, const void* buf, size_t cnt) {
+    return syscall3(SYS_WRITE, (uint32_t)fd, (uint32_t)buf, (uint32_t)cnt);
+}
+
+int read(int fd, void* buf, size_t cnt) {
+    return syscall3(SYS_READ, (uint32_t)fd, (uint32_t)buf, (uint32_t)cnt);
+}