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Diffstat (limited to 'contrib/llvm/lib/System/Unix/Memory.inc')
| -rw-r--r-- | contrib/llvm/lib/System/Unix/Memory.inc | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/contrib/llvm/lib/System/Unix/Memory.inc b/contrib/llvm/lib/System/Unix/Memory.inc new file mode 100644 index 0000000..1b038f9 --- /dev/null +++ b/contrib/llvm/lib/System/Unix/Memory.inc @@ -0,0 +1,151 @@ +//===- Unix/Memory.cpp - Generic UNIX System Configuration ------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file defines some functions for various memory management utilities. +// +//===----------------------------------------------------------------------===// + +#include "Unix.h" +#include "llvm/System/DataTypes.h" +#include "llvm/System/Process.h" + +#ifdef HAVE_SYS_MMAN_H +#include <sys/mman.h> +#endif + +#ifdef __APPLE__ +#include <mach/mach.h> +#endif + +/// AllocateRWX - Allocate a slab of memory with read/write/execute +/// permissions. This is typically used for JIT applications where we want +/// to emit code to the memory then jump to it. Getting this type of memory +/// is very OS specific. +/// +llvm::sys::MemoryBlock +llvm::sys::Memory::AllocateRWX(size_t NumBytes, const MemoryBlock* NearBlock, + std::string *ErrMsg) { + if (NumBytes == 0) return MemoryBlock(); + + size_t pageSize = Process::GetPageSize(); + size_t NumPages = (NumBytes+pageSize-1)/pageSize; + + int fd = -1; +#ifdef NEED_DEV_ZERO_FOR_MMAP + static int zero_fd = open("/dev/zero", O_RDWR); + if (zero_fd == -1) { + MakeErrMsg(ErrMsg, "Can't open /dev/zero device"); + return MemoryBlock(); + } + fd = zero_fd; +#endif + + int flags = MAP_PRIVATE | +#ifdef HAVE_MMAP_ANONYMOUS + MAP_ANONYMOUS +#else + MAP_ANON +#endif + ; + + void* start = NearBlock ? (unsigned char*)NearBlock->base() + + NearBlock->size() : 0; + +#if defined(__APPLE__) && defined(__arm__) + void *pa = ::mmap(start, pageSize*NumPages, PROT_READ|PROT_EXEC, + flags, fd, 0); +#else + void *pa = ::mmap(start, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC, + flags, fd, 0); +#endif + if (pa == MAP_FAILED) { + if (NearBlock) //Try again without a near hint + return AllocateRWX(NumBytes, 0); + + MakeErrMsg(ErrMsg, "Can't allocate RWX Memory"); + return MemoryBlock(); + } + +#if defined(__APPLE__) && defined(__arm__) + kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)pa, + (vm_size_t)(pageSize*NumPages), 0, + VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_COPY); + if (KERN_SUCCESS != kr) { + MakeErrMsg(ErrMsg, "vm_protect max RX failed"); + return sys::MemoryBlock(); + } + + kr = vm_protect(mach_task_self(), (vm_address_t)pa, + (vm_size_t)(pageSize*NumPages), 0, + VM_PROT_READ | VM_PROT_WRITE); + if (KERN_SUCCESS != kr) { + MakeErrMsg(ErrMsg, "vm_protect RW failed"); + return sys::MemoryBlock(); + } +#endif + + MemoryBlock result; + result.Address = pa; + result.Size = NumPages*pageSize; + + return result; +} + +bool llvm::sys::Memory::ReleaseRWX(MemoryBlock &M, std::string *ErrMsg) { + if (M.Address == 0 || M.Size == 0) return false; + if (0 != ::munmap(M.Address, M.Size)) + return MakeErrMsg(ErrMsg, "Can't release RWX Memory"); + return false; +} + +bool llvm::sys::Memory::setWritable (MemoryBlock &M, std::string *ErrMsg) { +#if defined(__APPLE__) && defined(__arm__) + if (M.Address == 0 || M.Size == 0) return false; + sys::Memory::InvalidateInstructionCache(M.Address, M.Size); + kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)M.Address, + (vm_size_t)M.Size, 0, VM_PROT_READ | VM_PROT_WRITE); + return KERN_SUCCESS == kr; +#else + return true; +#endif +} + +bool llvm::sys::Memory::setExecutable (MemoryBlock &M, std::string *ErrMsg) { +#if defined(__APPLE__) && defined(__arm__) + if (M.Address == 0 || M.Size == 0) return false; + sys::Memory::InvalidateInstructionCache(M.Address, M.Size); + kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)M.Address, + (vm_size_t)M.Size, 0, VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_COPY); + return KERN_SUCCESS == kr; +#else + return false; +#endif +} + +bool llvm::sys::Memory::setRangeWritable(const void *Addr, size_t Size) { +#if defined(__APPLE__) && defined(__arm__) + kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)Addr, + (vm_size_t)Size, 0, + VM_PROT_READ | VM_PROT_WRITE); + return KERN_SUCCESS == kr; +#else + return true; +#endif +} + +bool llvm::sys::Memory::setRangeExecutable(const void *Addr, size_t Size) { +#if defined(__APPLE__) && defined(__arm__) + kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)Addr, + (vm_size_t)Size, 0, + VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_COPY); + return KERN_SUCCESS == kr; +#else + return true; +#endif +} |
