Implemented a proper libc

libc/syscall.c

@@ -0,0 +1,32 @@
+#include <syscall.h>
+#include <stddef.h>
+
+#define MAX_SYSCALLS 9
+
+int syscall(int nr, int arg0, int arg1, int arg2) {
+    int ret = 0;
+    __asm__ volatile ("int $0x80" : "=a"(ret) : "a"(nr), "b"(arg0), "c"(arg1), "d"(arg2));
+    return ret;
+}
+
+/* Syscall wrappers */
+int read(int fd, void* ptr, size_t count) {
+    // Returns: int fd
+    return syscall(SYS_READ, fd, (int)ptr, count);
+}
+
+int write(int fd, const void* ptr, size_t count) {
+    // Returns: int count
+    return syscall(SYS_WRITE, fd, (int)ptr, count);
+}
+
+int open(const char* path, int oflag) {
+    // Returns: int fd
+    return syscall(SYS_OPEN, (int)path, oflag, 0);
+}
+
+int close(int fd) {
+    // Returns: int status
+    return syscall(SYS_CLOSE, fd, 0, 0);
+}
+