Add chainloader (stage2) (need to edit more files)

fusee/fusee-secondary/src/chainloader.c

@@ -0,0 +1,12 @@
+#include "chainloader.h"
+
+uint8_t g_payload_arg_data[PAYLOAD_ARG_DATA_MAX_SIZE] = {1};
+
+#pragma GCC optimize (3)
+void relocate_and_chainload_main(uintptr_t load_address, uintptr_t src_address, size_t size, int argc) {
+    for(size_t i = 0; i < size; i++) {
+        *(uint8_t *)(load_address + i) = *(uint8_t *)(src_address + i);
+    }
+
+    ((void (*)(int, void *))load_address)(argc, g_payload_arg_data);
+}

fusee/fusee-secondary/src/chainloader.h

@@ -0,0 +1,13 @@
+#ifndef FUSEE_CHAINLOADER_H
+#define FUSEE_CHAINLOADER_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define PAYLOAD_ARG_DATA_MAX_SIZE 0x1000
+
+extern uint8_t g_payload_arg_data[PAYLOAD_ARG_DATA_MAX_SIZE];
+
+void relocate_and_chainload(uintptr_t load_address, uintptr_t src_address, size_t size, int argc);
+
+#endif

fusee/fusee-secondary/src/start.s

@@ -2,10 +2,11 @@
     mov r\@, #0
 .endm
 
-.section .text.start
+.section .text.start, "ax", %progbits
 .arm
 .align 5
 .global _start
+.type   _start, %function
 _start:
     /* Insert NOPs for convenience (i.e. to use Nintendo's BCTs, for example) */
     .rept 16
@@ -57,3 +58,12 @@ _start:
     ldmfd sp!, {r0, r1}
     bl  main
     b   .
+
+.section .chainloader.text.start, "ax", %progbits
+.arm
+.align 5
+.global relocate_and_chainload
+.type   relocate_and_chainload, %function
+relocate_and_chainload:
+    ldr sp, =0x40010000
+    b   relocate_and_chainload_main