From 6a50b8a68d5a0595dc78c90f5d0969021beb7ea1 Mon Sep 17 00:00:00 2001
From: Justin Weiss
Date: Sat, 29 Feb 2020 10:50:30 -0800
Subject: [3DS] Fix dynarec prefetch aborts

Similar fix to https://github.com/libretro/pcsx_rearmed/pull/390. The
Nintendo svcBackdoor can cause stack corruption if an interrupt
happens during it, this uses Luma3DS/Rosalina's svcCustomBackdoor instead.
---
 3ds/3ds_utils.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

(limited to '3ds/3ds_utils.c')

diff --git a/3ds/3ds_utils.c b/3ds/3ds_utils.c
index 4f8f9be..266eca0 100644
--- a/3ds/3ds_utils.c
+++ b/3ds/3ds_utils.c
@@ -7,6 +7,20 @@
 
 typedef s32 (*ctr_callback_type)(void);
 
+void check_rosalina() {
+  int64_t version;
+  uint32_t major;
+
+  has_rosalina = false;
+
+  if (!svcGetSystemInfo(&version, 0x10000, 0)) {
+     major = GET_VERSION_MAJOR(version);
+
+     if (major >= 8)
+       has_rosalina = true;
+  }
+}
+
 static void ctr_invalidate_ICache_kernel(void)
 {
    __asm__ volatile(
@@ -38,6 +52,10 @@ void ctr_flush_DCache(void)
 
 void ctr_flush_invalidate_cache(void)
 {
-   ctr_flush_DCache();
-   ctr_invalidate_ICache();
+   if (has_rosalina) {
+      ctr_clear_cache();
+   } else {
+      ctr_flush_DCache();
+      ctr_invalidate_ICache();
+   }
 }
-- 
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