forked from OSchip/llvm-project
348 lines
10 KiB
C++
348 lines
10 KiB
C++
//===- Unix/Memory.cpp - Generic UNIX System Configuration ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines some functions for various memory management utilities.
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//
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Process.h"
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#ifdef __APPLE__
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#include <mach/mach.h>
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#endif
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#if defined(__mips__)
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# if defined(__OpenBSD__)
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# include <mips64/sysarch.h>
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# else
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# include <sys/cachectl.h>
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# endif
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#endif
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#ifdef __APPLE__
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extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
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#else
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extern "C" void __clear_cache(void *, void*);
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#endif
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namespace {
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int getPosixProtectionFlags(unsigned Flags) {
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switch (Flags) {
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case llvm::sys::Memory::MF_READ:
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return PROT_READ;
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case llvm::sys::Memory::MF_WRITE:
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return PROT_WRITE;
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case llvm::sys::Memory::MF_READ|llvm::sys::Memory::MF_WRITE:
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return PROT_READ | PROT_WRITE;
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case llvm::sys::Memory::MF_READ|llvm::sys::Memory::MF_EXEC:
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return PROT_READ | PROT_EXEC;
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case llvm::sys::Memory::MF_READ | llvm::sys::Memory::MF_WRITE |
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llvm::sys::Memory::MF_EXEC:
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return PROT_READ | PROT_WRITE | PROT_EXEC;
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case llvm::sys::Memory::MF_EXEC:
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#if defined(__FreeBSD__)
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// On PowerPC, having an executable page that has no read permission
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// can have unintended consequences. The function InvalidateInstruction-
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// Cache uses instructions dcbf and icbi, both of which are treated by
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// the processor as loads. If the page has no read permissions,
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// executing these instructions will result in a segmentation fault.
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// Somehow, this problem is not present on Linux, but it does happen
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// on FreeBSD.
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return PROT_READ | PROT_EXEC;
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#else
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return PROT_EXEC;
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#endif
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default:
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llvm_unreachable("Illegal memory protection flag specified!");
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}
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// Provide a default return value as required by some compilers.
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return PROT_NONE;
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}
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} // anonymous namespace
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namespace llvm {
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namespace sys {
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MemoryBlock
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Memory::allocateMappedMemory(size_t NumBytes,
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const MemoryBlock *const NearBlock,
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unsigned PFlags,
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std::error_code &EC) {
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EC = std::error_code();
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if (NumBytes == 0)
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return MemoryBlock();
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static const size_t PageSize = Process::getPageSize();
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const size_t NumPages = (NumBytes+PageSize-1)/PageSize;
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int fd = -1;
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#ifdef NEED_DEV_ZERO_FOR_MMAP
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static int zero_fd = open("/dev/zero", O_RDWR);
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if (zero_fd == -1) {
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EC = std::error_code(errno, std::generic_category());
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return MemoryBlock();
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}
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fd = zero_fd;
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#endif
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int MMFlags = MAP_PRIVATE |
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#ifdef HAVE_MMAP_ANONYMOUS
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MAP_ANONYMOUS
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#else
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MAP_ANON
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#endif
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; // Ends statement above
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int Protect = getPosixProtectionFlags(PFlags);
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// Use any near hint and the page size to set a page-aligned starting address
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uintptr_t Start = NearBlock ? reinterpret_cast<uintptr_t>(NearBlock->base()) +
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NearBlock->size() : 0;
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if (Start && Start % PageSize)
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Start += PageSize - Start % PageSize;
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void *Addr = ::mmap(reinterpret_cast<void*>(Start), PageSize*NumPages,
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Protect, MMFlags, fd, 0);
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if (Addr == MAP_FAILED) {
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if (NearBlock) //Try again without a near hint
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return allocateMappedMemory(NumBytes, nullptr, PFlags, EC);
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EC = std::error_code(errno, std::generic_category());
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return MemoryBlock();
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}
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MemoryBlock Result;
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Result.Address = Addr;
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Result.Size = NumPages*PageSize;
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if (PFlags & MF_EXEC)
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Memory::InvalidateInstructionCache(Result.Address, Result.Size);
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return Result;
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}
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std::error_code
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Memory::releaseMappedMemory(MemoryBlock &M) {
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if (M.Address == nullptr || M.Size == 0)
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return std::error_code();
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if (0 != ::munmap(M.Address, M.Size))
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return std::error_code(errno, std::generic_category());
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M.Address = nullptr;
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M.Size = 0;
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return std::error_code();
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}
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std::error_code
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Memory::protectMappedMemory(const MemoryBlock &M, unsigned Flags) {
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static const size_t PageSize = Process::getPageSize();
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if (M.Address == nullptr || M.Size == 0)
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return std::error_code();
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if (!Flags)
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return std::error_code(EINVAL, std::generic_category());
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int Protect = getPosixProtectionFlags(Flags);
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int Result = ::mprotect((void*)((uintptr_t)M.Address & ~(PageSize-1)), PageSize*((M.Size+PageSize-1)/PageSize), Protect);
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if (Result != 0)
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return std::error_code(errno, std::generic_category());
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if (Flags & MF_EXEC)
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Memory::InvalidateInstructionCache(M.Address, M.Size);
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return std::error_code();
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}
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/// AllocateRWX - Allocate a slab of memory with read/write/execute
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/// permissions. This is typically used for JIT applications where we want
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/// to emit code to the memory then jump to it. Getting this type of memory
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/// is very OS specific.
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///
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MemoryBlock
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Memory::AllocateRWX(size_t NumBytes, const MemoryBlock* NearBlock,
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std::string *ErrMsg) {
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if (NumBytes == 0) return MemoryBlock();
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static const size_t PageSize = Process::getPageSize();
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size_t NumPages = (NumBytes+PageSize-1)/PageSize;
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int fd = -1;
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#ifdef NEED_DEV_ZERO_FOR_MMAP
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static int zero_fd = open("/dev/zero", O_RDWR);
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if (zero_fd == -1) {
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MakeErrMsg(ErrMsg, "Can't open /dev/zero device");
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return MemoryBlock();
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}
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fd = zero_fd;
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#endif
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int flags = MAP_PRIVATE |
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#ifdef HAVE_MMAP_ANONYMOUS
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MAP_ANONYMOUS
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#else
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MAP_ANON
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#endif
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;
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void* start = NearBlock ? (unsigned char*)NearBlock->base() +
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NearBlock->size() : nullptr;
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#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
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void *pa = ::mmap(start, PageSize*NumPages, PROT_READ|PROT_EXEC,
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flags, fd, 0);
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#else
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void *pa = ::mmap(start, PageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC,
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flags, fd, 0);
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#endif
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if (pa == MAP_FAILED) {
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if (NearBlock) //Try again without a near hint
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return AllocateRWX(NumBytes, nullptr);
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MakeErrMsg(ErrMsg, "Can't allocate RWX Memory");
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return MemoryBlock();
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}
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#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
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kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)pa,
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(vm_size_t)(PageSize*NumPages), 0,
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VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_COPY);
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if (KERN_SUCCESS != kr) {
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MakeErrMsg(ErrMsg, "vm_protect max RX failed");
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return MemoryBlock();
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}
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kr = vm_protect(mach_task_self(), (vm_address_t)pa,
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(vm_size_t)(PageSize*NumPages), 0,
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VM_PROT_READ | VM_PROT_WRITE);
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if (KERN_SUCCESS != kr) {
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MakeErrMsg(ErrMsg, "vm_protect RW failed");
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return MemoryBlock();
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}
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#endif
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MemoryBlock result;
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result.Address = pa;
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result.Size = NumPages*PageSize;
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return result;
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}
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bool Memory::ReleaseRWX(MemoryBlock &M, std::string *ErrMsg) {
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if (M.Address == nullptr || M.Size == 0) return false;
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if (0 != ::munmap(M.Address, M.Size))
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return MakeErrMsg(ErrMsg, "Can't release RWX Memory");
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return false;
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}
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bool Memory::setWritable (MemoryBlock &M, std::string *ErrMsg) {
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#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
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if (M.Address == 0 || M.Size == 0) return false;
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Memory::InvalidateInstructionCache(M.Address, M.Size);
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kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)M.Address,
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(vm_size_t)M.Size, 0, VM_PROT_READ | VM_PROT_WRITE);
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return KERN_SUCCESS == kr;
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#else
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return true;
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#endif
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}
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bool Memory::setExecutable (MemoryBlock &M, std::string *ErrMsg) {
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if (M.Address == nullptr || M.Size == 0) return false;
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Memory::InvalidateInstructionCache(M.Address, M.Size);
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#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
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kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)M.Address,
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(vm_size_t)M.Size, 0, VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_COPY);
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return KERN_SUCCESS == kr;
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#else
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return true;
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#endif
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}
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bool Memory::setRangeWritable(const void *Addr, size_t Size) {
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#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
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kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)Addr,
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(vm_size_t)Size, 0,
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VM_PROT_READ | VM_PROT_WRITE);
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return KERN_SUCCESS == kr;
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#else
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return true;
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#endif
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}
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bool Memory::setRangeExecutable(const void *Addr, size_t Size) {
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#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
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kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)Addr,
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(vm_size_t)Size, 0,
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VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_COPY);
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return KERN_SUCCESS == kr;
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#else
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return true;
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#endif
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}
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/// InvalidateInstructionCache - Before the JIT can run a block of code
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/// that has been emitted it must invalidate the instruction cache on some
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/// platforms.
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void Memory::InvalidateInstructionCache(const void *Addr,
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size_t Len) {
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// icache invalidation for PPC and ARM.
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#if defined(__APPLE__)
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# if (defined(__POWERPC__) || defined (__ppc__) || \
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defined(_POWER) || defined(_ARCH_PPC) || defined(__arm__) || \
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defined(__arm64__))
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sys_icache_invalidate(const_cast<void *>(Addr), Len);
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# endif
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#else
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# if (defined(__POWERPC__) || defined (__ppc__) || \
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defined(_POWER) || defined(_ARCH_PPC)) && defined(__GNUC__)
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const size_t LineSize = 32;
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const intptr_t Mask = ~(LineSize - 1);
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const intptr_t StartLine = ((intptr_t) Addr) & Mask;
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const intptr_t EndLine = ((intptr_t) Addr + Len + LineSize - 1) & Mask;
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for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
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asm volatile("dcbf 0, %0" : : "r"(Line));
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asm volatile("sync");
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for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
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asm volatile("icbi 0, %0" : : "r"(Line));
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asm volatile("isync");
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# elif (defined(__arm__) || defined(__aarch64__) || defined(__mips__)) && \
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defined(__GNUC__)
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// FIXME: Can we safely always call this for __GNUC__ everywhere?
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const char *Start = static_cast<const char *>(Addr);
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const char *End = Start + Len;
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__clear_cache(const_cast<char *>(Start), const_cast<char *>(End));
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# endif
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#endif // end apple
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ValgrindDiscardTranslations(Addr, Len);
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}
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} // namespace sys
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} // namespace llvm
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