added files via upload

Tweaks/PSHeader/PAC.h

@@ -0,0 +1,36 @@
+#ifndef PTRAUTH_HELPERS_H
+#define PTRAUTH_HELPERS_H
+// Helpers for PAC archs.
+// https://gist.github.com/summertriangle-dev/6b0449ce561f756ac82a4bc3de7af30a
+
+// If the compiler understands __arm64e__, assume it's paired with an SDK that has
+// ptrauth.h. Otherwise, it'll probably error if we try to include it so don't.
+#if __arm64e__
+#include <ptrauth.h>
+#endif
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
+
+// Given a pointer to instructions, sign it so you can call it like a normal fptr.
+static void *make_sym_callable(void *ptr) {
+#if __arm64e__
+    if (ptr == NULL)
+        return NULL;
+    ptr = ptrauth_sign_unauthenticated(ptrauth_strip(ptr, ptrauth_key_function_pointer), ptrauth_key_function_pointer, 0);
+#endif
+    return ptr;
+}
+
+// Given a function pointer, strip the PAC so you can read the instructions.
+static void *make_sym_readable(void *ptr) {
+#if __arm64e__
+    if (ptr == NULL)
+        return NULL;
+    ptr = ptrauth_strip(ptr, ptrauth_key_function_pointer);
+#endif
+    return ptr;
+}
+
+#pragma clang diagnostic pop
+#endif