mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-17 03:30:28 +00:00
d3aaad2d26
Buildbot reports a test failure on the llvm-mips-linux builder and blames r211588. Although it doesn't appear in the blamelist, it seems it could also be r211587 (because it's committed to compiler-rt?) since they were tested together. Reverting the most likely suspect (r211588) to confirm one way or the other. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211594 91177308-0d34-0410-b5e6-96231b3b80d8
362 lines
11 KiB
C++
362 lines
11 KiB
C++
//===- 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/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
|
|
|
|
#if defined(__mips__)
|
|
# if defined(__OpenBSD__)
|
|
# include <mips64/sysarch.h>
|
|
# else
|
|
# include <sys/cachectl.h>
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef __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) {
|
|
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__)
|
|
// 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.
|
|
// Somehow, this problem is not present on Linux, but it does happen
|
|
// on FreeBSD.
|
|
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;
|
|
}
|
|
|
|
} // 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();
|
|
|
|
static const size_t PageSize = process::get_self()->page_size();
|
|
const 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) {
|
|
EC = std::error_code(errno, std::generic_category());
|
|
return MemoryBlock();
|
|
}
|
|
fd = zero_fd;
|
|
#endif
|
|
|
|
int MMFlags = MAP_PRIVATE |
|
|
#ifdef HAVE_MMAP_ANONYMOUS
|
|
MAP_ANONYMOUS
|
|
#else
|
|
MAP_ANON
|
|
#endif
|
|
; // Ends statement above
|
|
|
|
int Protect = getPosixProtectionFlags(PFlags);
|
|
|
|
// 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->size() : 0;
|
|
if (Start && Start % PageSize)
|
|
Start += PageSize - Start % PageSize;
|
|
|
|
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
|
|
return allocateMappedMemory(NumBytes, nullptr, PFlags, EC);
|
|
|
|
EC = std::error_code(errno, std::generic_category());
|
|
return MemoryBlock();
|
|
}
|
|
|
|
MemoryBlock Result;
|
|
Result.Address = Addr;
|
|
Result.Size = NumPages*PageSize;
|
|
|
|
if (PFlags & MF_EXEC)
|
|
Memory::InvalidateInstructionCache(Result.Address, Result.Size);
|
|
|
|
return Result;
|
|
}
|
|
|
|
std::error_code
|
|
Memory::releaseMappedMemory(MemoryBlock &M) {
|
|
if (M.Address == nullptr || M.Size == 0)
|
|
return std::error_code();
|
|
|
|
if (0 != ::munmap(M.Address, M.Size))
|
|
return std::error_code(errno, std::generic_category());
|
|
|
|
M.Address = nullptr;
|
|
M.Size = 0;
|
|
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code
|
|
Memory::protectMappedMemory(const MemoryBlock &M, unsigned Flags) {
|
|
if (M.Address == nullptr || M.Size == 0)
|
|
return std::error_code();
|
|
|
|
if (!Flags)
|
|
return std::error_code(EINVAL, std::generic_category());
|
|
|
|
int Protect = getPosixProtectionFlags(Flags);
|
|
|
|
int Result = ::mprotect(M.Address, M.Size, Protect);
|
|
if (Result != 0)
|
|
return std::error_code(errno, std::generic_category());
|
|
|
|
if (Flags & MF_EXEC)
|
|
Memory::InvalidateInstructionCache(M.Address, M.Size);
|
|
|
|
return std::error_code();
|
|
}
|
|
|
|
/// 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.
|
|
///
|
|
MemoryBlock
|
|
Memory::AllocateRWX(size_t NumBytes, const MemoryBlock* NearBlock,
|
|
std::string *ErrMsg) {
|
|
if (NumBytes == 0) return MemoryBlock();
|
|
|
|
size_t PageSize = process::get_self()->page_size();
|
|
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() : nullptr;
|
|
|
|
#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
|
|
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, nullptr);
|
|
|
|
MakeErrMsg(ErrMsg, "Can't allocate RWX Memory");
|
|
return MemoryBlock();
|
|
}
|
|
|
|
#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
|
|
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 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 MemoryBlock();
|
|
}
|
|
#endif
|
|
|
|
MemoryBlock result;
|
|
result.Address = pa;
|
|
result.Size = NumPages*PageSize;
|
|
|
|
return result;
|
|
}
|
|
|
|
bool Memory::ReleaseRWX(MemoryBlock &M, std::string *ErrMsg) {
|
|
if (M.Address == nullptr || M.Size == 0) return false;
|
|
if (0 != ::munmap(M.Address, M.Size))
|
|
return MakeErrMsg(ErrMsg, "Can't release RWX Memory");
|
|
return false;
|
|
}
|
|
|
|
bool Memory::setWritable (MemoryBlock &M, std::string *ErrMsg) {
|
|
#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
|
|
if (M.Address == 0 || M.Size == 0) return false;
|
|
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 Memory::setExecutable (MemoryBlock &M, std::string *ErrMsg) {
|
|
#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
|
|
if (M.Address == 0 || M.Size == 0) return false;
|
|
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;
|
|
#elif defined(__arm__) || defined(__aarch64__)
|
|
Memory::InvalidateInstructionCache(M.Address, M.Size);
|
|
return true;
|
|
#else
|
|
return true;
|
|
#endif
|
|
}
|
|
|
|
bool Memory::setRangeWritable(const void *Addr, size_t Size) {
|
|
#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
|
|
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 Memory::setRangeExecutable(const void *Addr, size_t Size) {
|
|
#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
|
|
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
|
|
}
|
|
|
|
/// 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
|
|
|
|
#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(__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));
|
|
# elif defined(__mips__)
|
|
const char *Start = static_cast<const char *>(Addr);
|
|
# if defined(ANDROID)
|
|
// The declaration of "cacheflush" in Android bionic:
|
|
// extern int cacheflush(long start, long end, long flags);
|
|
const char *End = Start + Len;
|
|
long LStart = reinterpret_cast<long>(const_cast<char *>(Start));
|
|
long LEnd = reinterpret_cast<long>(const_cast<char *>(End));
|
|
cacheflush(LStart, LEnd, BCACHE);
|
|
# else
|
|
cacheflush(const_cast<char *>(Start), Len, BCACHE);
|
|
# endif
|
|
# endif
|
|
|
|
#endif // end apple
|
|
|
|
ValgrindDiscardTranslations(Addr, Len);
|
|
}
|
|
|
|
} // namespace sys
|
|
} // namespace llvm
|