From a165d44090d1b2470f43f794ab0b28b879d31fa0 Mon Sep 17 00:00:00 2001
From: Nicolas Pixel Noble <pixel@nobis-crew.org>
Date: Tue, 21 Nov 2023 22:39:02 -0800
Subject: [PATCH] Tweaking OpenBIOS' fastboot to work with cheat roms.

---
 src/mips/openbios/shell/shell.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/mips/openbios/shell/shell.c b/src/mips/openbios/shell/shell.c
index 471714d18..8dfafb059 100644
--- a/src/mips/openbios/shell/shell.c
+++ b/src/mips/openbios/shell/shell.c
@@ -47,10 +47,13 @@ int startShell(uint32_t arg) {
     }
 #endif
 #ifdef OPENBIOS_FASTBOOT
-    return 0;
+    // Embed a simple jr $ra / nop to simulate a shell being copied and run,
+    // so cheat cart hooks and other tricks can still work properly.
+    static const uint32_t dummy[2] = {0x03e00008, 0};
+    memcpy((uint32_t *)0x80030000, dummy, sizeof(dummy));
 #else
     memcpy((uint32_t *)0x80030000, _binary_shell_bin_start, _binary_shell_bin_end - _binary_shell_bin_start);
+#endif
     flushCache();
     return ((int (*)(int))0x80030000)(arg);
-#endif
 }