Add a new InvalidateInstructionCache method to sys::Memory.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52731 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Memory.cpp b/lib/System/Memory.cpp
index 054cc96..bbb7917 100644
--- a/lib/System/Memory.cpp
+++ b/lib/System/Memory.cpp
@@ -17,12 +17,6 @@
namespace llvm {
using namespace sys;
-
-//===----------------------------------------------------------------------===//
-//=== WARNING: Implementation here must contain only TRULY operating system
-//=== independent code.
-//===----------------------------------------------------------------------===//
-
}
// Include the platform-specific parts of this class.
@@ -32,3 +26,34 @@
#ifdef LLVM_ON_WIN32
#include "Win32/Memory.inc"
#endif
+
+/// InvalidateInstructionCache - Before the JIT can run a block of code
+/// that has been emitted it must invalidate the instruction cache on some
+/// platforms.
+void llvm::sys::Memory::InvalidateInstructionCache(const void *Addr,
+ size_t Len) {
+
+// icache invalidation for PPC.
+#if (defined(__POWERPC__) || defined (__ppc__) || \
+ defined(_POWER) || defined(_ARCH_PPC))
+ #if defined(__APPLE__)
+ extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
+ sys_icache_invalidate(Addr, len);
+ #elif defined(__GNUC__)
+ const size_t LineSize = 32;
+
+ const intptr_t Mask = ~(LineSize - 1);
+ const intptr_t StartLine = ((intptr_t) Addr) & Mask;
+ const intptr_t EndLine = ((intptr_t) Addr + len + LineSize - 1) & Mask;
+
+ for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
+ asm volatile("dcbf 0, %0" : : "r"(Line));
+ asm volatile("sync");
+
+ for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
+ asm volatile("icbi 0, %0" : : "r"(Line));
+ asm volatile("isync");
+ #endif
+#endif // end PPC
+
+}
\ No newline at end of file