1 //===- Memory.cpp - Memory Handling Support ---------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines some helpful functions for allocating memory and dealing 11 // with memory mapped files 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/Support/Memory.h" 16 #include "llvm/Support/Valgrind.h" 17 #include "llvm/Config/config.h" 18 19 namespace llvm { 20 using namespace sys; 21 } 22 23 // Include the platform-specific parts of this class. 24 #ifdef LLVM_ON_UNIX 25 #include "Unix/Memory.inc" 26 #endif 27 #ifdef LLVM_ON_WIN32 28 #include "Windows/Memory.inc" 29 #endif 30 31 extern "C" void sys_icache_invalidate(const void *Addr, size_t len); 32 33 /// InvalidateInstructionCache - Before the JIT can run a block of code 34 /// that has been emitted it must invalidate the instruction cache on some 35 /// platforms. 36 void llvm::sys::Memory::InvalidateInstructionCache(const void *Addr, 37 size_t Len) { 38 39 // icache invalidation for PPC and ARM. 40 #if defined(__APPLE__) 41 42 # if (defined(__POWERPC__) || defined (__ppc__) || \ 43 defined(_POWER) || defined(_ARCH_PPC)) || defined(__arm__) 44 sys_icache_invalidate(Addr, Len); 45 # endif 46 47 #else 48 49 # if (defined(__POWERPC__) || defined (__ppc__) || \ 50 defined(_POWER) || defined(_ARCH_PPC)) && defined(__GNUC__) 51 const size_t LineSize = 32; 52 53 const intptr_t Mask = ~(LineSize - 1); 54 const intptr_t StartLine = ((intptr_t) Addr) & Mask; 55 const intptr_t EndLine = ((intptr_t) Addr + Len + LineSize - 1) & Mask; 56 57 for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize) 58 asm volatile("dcbf 0, %0" : : "r"(Line)); 59 asm volatile("sync"); 60 61 for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize) 62 asm volatile("icbi 0, %0" : : "r"(Line)); 63 asm volatile("isync"); 64 # elif defined(__arm__) && defined(__GNUC__) 65 // FIXME: Can we safely always call this for __GNUC__ everywhere? 66 char *Start = (char*) Addr; 67 char *End = Start + Len; 68 __clear_cache(Start, End); 69 # endif 70 71 #endif // end apple 72 73 ValgrindDiscardTranslations(Addr, Len); 74 } 75
