fusee: uncompress fusee-primary, which is now getting pretty big.

fusee/fusee-primary/src/loader_stub.c

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include "lz4.h"
+#include "utils.h"
+
+#define PRIMARY_START    (0x40008000)
+#define PRIMARY_SIZE_MAX (0x28000)
+#define PRIMARY_END      (PRIMARY_START + PRIMARY_SIZE_MAX)
+
+void load_fusee_primary_main(void *compressed_main, size_t main_size) {
+    /* Relocate the compressed binary to a place where we can safely decompress it. */
+    void *relocated_main = (void *)(PRIMARY_END - main_size);
+    loader_memmove(relocated_main, compressed_main, main_size);
+
+    /* Uncompress the compressed binary. */
+    lz4_uncompress((void *)PRIMARY_START, PRIMARY_SIZE_MAX, relocated_main, main_size);
+
+    /* Jump to the newly uncompressed binary. */
+    ((void (*)(void))(PRIMARY_START))();
+
+    /* We will never reach this point. */
+    __builtin_unreachable();
+}