From b7569147823a8fc5a9de98e5d491da906e119296 Mon Sep 17 00:00:00 2001
From: notaz
Date: Sun, 28 Oct 2012 16:32:24 +0200
Subject: psx_gpu: workaround overflow crash

rare corner case
---
 plugins/gpu_neon/psx_gpu/psx_gpu_arm_neon.S | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'plugins/gpu_neon/psx_gpu/psx_gpu_arm_neon.S')

diff --git a/plugins/gpu_neon/psx_gpu/psx_gpu_arm_neon.S b/plugins/gpu_neon/psx_gpu/psx_gpu_arm_neon.S
index a2bfa5b..4e1e403 100644
--- a/plugins/gpu_neon/psx_gpu/psx_gpu_arm_neon.S
+++ b/plugins/gpu_neon/psx_gpu/psx_gpu_arm_neon.S
@@ -1175,6 +1175,10 @@ function(setup_spans_up_down)
 
   ldrh temp, [ psx_gpu, #psx_gpu_num_spans_offset ]
   add temp, temp, height_minor_b
+
+  cmp temp, #MAX_SPANS
+  beq 5f
+
   strh temp, [ psx_gpu, #psx_gpu_num_spans_offset ]
 
  2:                                                     
@@ -1190,6 +1194,15 @@ function(setup_spans_up_down)
   setup_spans_prologue_b()
   bal 4b
 
+ 5:
+  // FIXME: overflow corner case
+  sub temp, temp, height_minor_b
+  bics height_minor_b, #3
+  add temp, temp, height_minor_b
+  strh temp, [ psx_gpu, #psx_gpu_num_spans_offset ]
+  bne 2b
+  bal 1b
+
 .pool
 
 #undef span_uvrg_offset
-- 
cgit v1.2.3