1 //===- Memory.cpp - Memory Handling Support ---------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines some helpful functions for allocating memory and dealing
11 // with memory mapped files
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Support/Memory.h"
16 #include "llvm/Support/Valgrind.h"
17 #include "llvm/Config/config.h"
20 #include <sys/cachectl.h>
27 // Include the platform-specific parts of this class.
29 #include "Unix/Memory.inc"
32 #include "Windows/Memory.inc"
35 extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
37 /// InvalidateInstructionCache - Before the JIT can run a block of code
38 /// that has been emitted it must invalidate the instruction cache on some
40 void llvm::sys::Memory::InvalidateInstructionCache(const void *Addr,
43 // icache invalidation for PPC and ARM.
44 #if defined(__APPLE__)
46 # if (defined(__POWERPC__) || defined (__ppc__) || \
47 defined(_POWER) || defined(_ARCH_PPC)) || defined(__arm__)
48 sys_icache_invalidate(const_cast<void *>(Addr), Len);
53 # if (defined(__POWERPC__) || defined (__ppc__) || \
54 defined(_POWER) || defined(_ARCH_PPC)) && defined(__GNUC__)
55 const size_t LineSize = 32;
57 const intptr_t Mask = ~(LineSize - 1);
58 const intptr_t StartLine = ((intptr_t) Addr) & Mask;
59 const intptr_t EndLine = ((intptr_t) Addr + Len + LineSize - 1) & Mask;
61 for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
62 asm volatile("dcbf 0, %0" : : "r"(Line));
65 for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
66 asm volatile("icbi 0, %0" : : "r"(Line));
67 asm volatile("isync");
68 # elif defined(__arm__) && defined(__GNUC__)
69 // FIXME: Can we safely always call this for __GNUC__ everywhere?
70 const char *Start = static_cast<const char *>(Addr);
71 const char *End = Start + Len;
72 __clear_cache(const_cast<char *>(Start), const_cast<char *>(End));
73 # elif defined(__mips__)
74 const char *Start = static_cast<const char *>(Addr);
75 cacheflush(const_cast<char *>(Start), Len, BCACHE);
80 ValgrindDiscardTranslations(Addr, Len);