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-rw-r--r--contrib/llvm/lib/Support/Unix/Memory.inc268
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diff --git a/contrib/llvm/lib/Support/Unix/Memory.inc b/contrib/llvm/lib/Support/Unix/Memory.inc
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index a0927da50e48..000000000000
--- a/contrib/llvm/lib/Support/Unix/Memory.inc
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@@ -1,268 +0,0 @@
-//===- Unix/Memory.cpp - Generic UNIX System Configuration ------*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines some functions for various memory management utilities.
-//
-//===----------------------------------------------------------------------===//
-
-#include "Unix.h"
-#include "llvm/Config/config.h"
-#include "llvm/Support/DataTypes.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/Process.h"
-
-#ifdef HAVE_SYS_MMAN_H
-#include <sys/mman.h>
-#endif
-
-#ifdef __APPLE__
-#include <mach/mach.h>
-#endif
-
-#ifdef __Fuchsia__
-#include <zircon/syscalls.h>
-#endif
-
-#if defined(__mips__)
-# if defined(__OpenBSD__)
-# include <mips64/sysarch.h>
-# elif !defined(__FreeBSD__)
-# include <sys/cachectl.h>
-# endif
-#endif
-
-#if defined(__APPLE__)
-extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
-#else
-extern "C" void __clear_cache(void *, void*);
-#endif
-
-namespace {
-
-int getPosixProtectionFlags(unsigned Flags) {
- switch (Flags & llvm::sys::Memory::MF_RWE_MASK) {
- case llvm::sys::Memory::MF_READ:
- return PROT_READ;
- case llvm::sys::Memory::MF_WRITE:
- return PROT_WRITE;
- case llvm::sys::Memory::MF_READ|llvm::sys::Memory::MF_WRITE:
- return PROT_READ | PROT_WRITE;
- case llvm::sys::Memory::MF_READ|llvm::sys::Memory::MF_EXEC:
- return PROT_READ | PROT_EXEC;
- case llvm::sys::Memory::MF_READ | llvm::sys::Memory::MF_WRITE |
- llvm::sys::Memory::MF_EXEC:
- return PROT_READ | PROT_WRITE | PROT_EXEC;
- case llvm::sys::Memory::MF_EXEC:
-#if (defined(__FreeBSD__) || defined(__POWERPC__) || defined (__ppc__) || \
- defined(_POWER) || defined(_ARCH_PPC))
- // On PowerPC, having an executable page that has no read permission
- // can have unintended consequences. The function InvalidateInstruction-
- // Cache uses instructions dcbf and icbi, both of which are treated by
- // the processor as loads. If the page has no read permissions,
- // executing these instructions will result in a segmentation fault.
- return PROT_READ | PROT_EXEC;
-#else
- return PROT_EXEC;
-#endif
- default:
- llvm_unreachable("Illegal memory protection flag specified!");
- }
- // Provide a default return value as required by some compilers.
- return PROT_NONE;
-}
-
-} // anonymous namespace
-
-namespace llvm {
-namespace sys {
-
-MemoryBlock
-Memory::allocateMappedMemory(size_t NumBytes,
- const MemoryBlock *const NearBlock,
- unsigned PFlags,
- std::error_code &EC) {
- EC = std::error_code();
- if (NumBytes == 0)
- return MemoryBlock();
-
- // On platforms that have it, we can use MAP_ANON to get a memory-mapped
- // page without file backing, but we need a fallback of opening /dev/zero
- // for strictly POSIX platforms instead.
- int fd;
-#if defined(MAP_ANON)
- fd = -1;
-#else
- fd = open("/dev/zero", O_RDWR);
- if (fd == -1) {
- EC = std::error_code(errno, std::generic_category());
- return MemoryBlock();
- }
-#endif
-
- int MMFlags = MAP_PRIVATE;
-#if defined(MAP_ANON)
- MMFlags |= MAP_ANON;
-#endif
- int Protect = getPosixProtectionFlags(PFlags);
-
-#if defined(__NetBSD__) && defined(PROT_MPROTECT)
- Protect |= PROT_MPROTECT(PROT_READ | PROT_WRITE | PROT_EXEC);
-#endif
-
- // Use any near hint and the page size to set a page-aligned starting address
- uintptr_t Start = NearBlock ? reinterpret_cast<uintptr_t>(NearBlock->base()) +
- NearBlock->allocatedSize() : 0;
- static const size_t PageSize = Process::getPageSizeEstimate();
- const size_t NumPages = (NumBytes+PageSize-1)/PageSize;
-
- if (Start && Start % PageSize)
- Start += PageSize - Start % PageSize;
-
- // FIXME: Handle huge page requests (MF_HUGE_HINT).
- void *Addr = ::mmap(reinterpret_cast<void *>(Start), PageSize*NumPages, Protect,
- MMFlags, fd, 0);
- if (Addr == MAP_FAILED) {
- if (NearBlock) { //Try again without a near hint
-#if !defined(MAP_ANON)
- close(fd);
-#endif
- return allocateMappedMemory(NumBytes, nullptr, PFlags, EC);
- }
-
- EC = std::error_code(errno, std::generic_category());
-#if !defined(MAP_ANON)
- close(fd);
-#endif
- return MemoryBlock();
- }
-
-#if !defined(MAP_ANON)
- close(fd);
-#endif
-
- MemoryBlock Result;
- Result.Address = Addr;
- Result.AllocatedSize = PageSize*NumPages;
- Result.Flags = PFlags;
-
- // Rely on protectMappedMemory to invalidate instruction cache.
- if (PFlags & MF_EXEC) {
- EC = Memory::protectMappedMemory (Result, PFlags);
- if (EC != std::error_code())
- return MemoryBlock();
- }
-
- return Result;
-}
-
-std::error_code
-Memory::releaseMappedMemory(MemoryBlock &M) {
- if (M.Address == nullptr || M.AllocatedSize == 0)
- return std::error_code();
-
- if (0 != ::munmap(M.Address, M.AllocatedSize))
- return std::error_code(errno, std::generic_category());
-
- M.Address = nullptr;
- M.AllocatedSize = 0;
-
- return std::error_code();
-}
-
-std::error_code
-Memory::protectMappedMemory(const MemoryBlock &M, unsigned Flags) {
- static const size_t PageSize = Process::getPageSizeEstimate();
- if (M.Address == nullptr || M.AllocatedSize == 0)
- return std::error_code();
-
- if (!Flags)
- return std::error_code(EINVAL, std::generic_category());
-
- int Protect = getPosixProtectionFlags(Flags);
- uintptr_t Start = alignAddr((uint8_t *)M.Address - PageSize + 1, PageSize);
- uintptr_t End = alignAddr((uint8_t *)M.Address + M.AllocatedSize, PageSize);
-
- bool InvalidateCache = (Flags & MF_EXEC);
-
-#if defined(__arm__) || defined(__aarch64__)
- // Certain ARM implementations treat icache clear instruction as a memory read,
- // and CPU segfaults on trying to clear cache on !PROT_READ page. Therefore we need
- // to temporarily add PROT_READ for the sake of flushing the instruction caches.
- if (InvalidateCache && !(Protect & PROT_READ)) {
- int Result = ::mprotect((void *)Start, End - Start, Protect | PROT_READ);
- if (Result != 0)
- return std::error_code(errno, std::generic_category());
-
- Memory::InvalidateInstructionCache(M.Address, M.AllocatedSize);
- InvalidateCache = false;
- }
-#endif
-
- int Result = ::mprotect((void *)Start, End - Start, Protect);
-
- if (Result != 0)
- return std::error_code(errno, std::generic_category());
-
- if (InvalidateCache)
- Memory::InvalidateInstructionCache(M.Address, M.AllocatedSize);
-
- return std::error_code();
-}
-
-/// InvalidateInstructionCache - Before the JIT can run a block of code
-/// that has been emitted it must invalidate the instruction cache on some
-/// platforms.
-void Memory::InvalidateInstructionCache(const void *Addr,
- size_t Len) {
-
-// icache invalidation for PPC and ARM.
-#if defined(__APPLE__)
-
-# if (defined(__POWERPC__) || defined (__ppc__) || \
- defined(_POWER) || defined(_ARCH_PPC) || defined(__arm__) || \
- defined(__arm64__))
- sys_icache_invalidate(const_cast<void *>(Addr), Len);
-# endif
-
-#elif defined(__Fuchsia__)
-
- zx_status_t Status = zx_cache_flush(Addr, Len, ZX_CACHE_FLUSH_INSN);
- assert(Status == ZX_OK && "cannot invalidate instruction cache");
-
-#else
-
-# if (defined(__POWERPC__) || defined (__ppc__) || \
- defined(_POWER) || defined(_ARCH_PPC)) && 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");
-# elif (defined(__arm__) || defined(__aarch64__) || defined(__mips__)) && \
- defined(__GNUC__)
- // FIXME: Can we safely always call this for __GNUC__ everywhere?
- const char *Start = static_cast<const char *>(Addr);
- const char *End = Start + Len;
- __clear_cache(const_cast<char *>(Start), const_cast<char *>(End));
-# endif
-
-#endif // end apple
-
- ValgrindDiscardTranslations(Addr, Len);
-}
-
-} // namespace sys
-} // namespace llvm
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