webkitgtk-2.4.9webkitgtk-2.4.9

1 files changed, 20 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/assembler/MIPSAssembler.h b/Source/JavaScriptCore/assembler/MIPSAssembler.h
index caad1524d..b75b4d0af 100644
--- a/Source/JavaScriptCore/assembler/MIPSAssembler.h
+++ b/Source/JavaScriptCore/assembler/MIPSAssembler.h
@@ -870,8 +870,28 @@ public:
 
     static void cacheFlush(void* code, size_t size)
     {
+#if GCC_VERSION_AT_LEAST(4, 3, 0)
+#if WTF_MIPS_ISA_REV(2) && !GCC_VERSION_AT_LEAST(4, 4, 3)
+        int lineSize;
+        asm("rdhwr %0, $1" : "=r" (lineSize));
+        //
+        // Modify "start" and "end" to avoid GCC 4.3.0-4.4.2 bug in
+        // mips_expand_synci_loop that may execute synci one more time.
+        // "start" points to the fisrt byte of the cache line.
+        // "end" points to the last byte of the line before the last cache line.
+        // Because size is always a multiple of 4, this is safe to set
+        // "end" to the last byte.
+        //
+        intptr_t start = reinterpret_cast<intptr_t>(code) & (-lineSize);
+        intptr_t end = ((reinterpret_cast<intptr_t>(code) + size - 1) & (-lineSize)) - 1;
+        __builtin___clear_cache(reinterpret_cast<char*>(start), reinterpret_cast<char*>(end));
+#else
         intptr_t end = reinterpret_cast<intptr_t>(code) + size;
         __builtin___clear_cache(reinterpret_cast<char*>(code), reinterpret_cast<char*>(end));
+#endif
+#else
+        _flush_cache(reinterpret_cast<char*>(code), size, BCACHE);
+#endif
     }
 
     static ptrdiff_t maxJumpReplacementSize()