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Common: Use Mach VM routines for memory mapping 

MacOS does not support an equivalent of MAP_FIXED_NOREPLACE via mmap(),
which means that our usage for allocating PCSX2's memory map is not
thread-safe.
This commit is contained in:
Stenzek 2024-05-29 18:57:00 +10:00 committed by Connor McLaughlin
parent 18665b81c4
commit ecbe239c0b
2 changed files with 228 additions and 31 deletions
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224
common/Darwin/DarwinMisc.cpp
View File

@ -1,4 +1,4 @@
// SPDX-FileCopyrightText: 2002-2023 PCSX2 Dev Team
// SPDX-FileCopyrightText: 2002-2024 PCSX2 Dev Team
// SPDX-License-Identifier: LGPL-3.0+
#if defined(__APPLE__)
@ -9,14 +9,21 @@
#include <cstring>
#include <cstdlib>
#include <optional>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <time.h>
#include <mach/mach_init.h>
#include <mach/mach_port.h>
#include <mach/mach_time.h>
#include <mach/mach_vm.h>
#include <mach/vm_map.h>
#include <IOKit/pwr_mgt/IOPMLib.h>
#include "common/Pcsx2Types.h"
#include "common/Assertions.h"
#include "common/BitUtils.h"
#include "common/Console.h"
#include "common/Pcsx2Types.h"
#include "common/HostSys.h"
#include "common/Threading.h"
#include "common/WindowInfo.h"
@ -181,4 +188,217 @@ std::vector<DarwinMisc::CPUClass> DarwinMisc::GetCPUClasses()
return out;
}
static __ri vm_prot_t MachProt(const PageProtectionMode& mode)
{
vm_prot_t machmode = (mode.CanWrite()) ? VM_PROT_WRITE : 0;
machmode |= (mode.CanRead()) ? VM_PROT_READ : 0;
machmode |= (mode.CanExecute()) ? (VM_PROT_EXECUTE | VM_PROT_READ) : 0;
return machmode;
}
void* HostSys::Mmap(void* base, size_t size, const PageProtectionMode& mode)
{
pxAssertMsg((size & (__pagesize - 1)) == 0, "Size is page aligned");
if (mode.IsNone())
return nullptr;
#ifdef __aarch64__
// We can't allocate executable memory with mach_vm_allocate() on Apple Silicon.
// Instead, we need to use MAP_JIT with mmap(), which does not support fixed mappings.
if (mode.CanExecute())
{
if (base)
return nullptr;
const u32 mmap_prot = mode.CanWrite() ? (PROT_READ | PROT_WRITE | PROT_EXEC) : (PROT_READ | PROT_EXEC);
const u32 flags = MAP_PRIVATE | MAP_ANON | MAP_JIT;
void* const res = mmap(nullptr, size, mmap_prot, flags, -1, 0);
return (res == MAP_FAILED) ? nullptr : res;
}
#endif
kern_return_t ret = mach_vm_allocate(mach_task_self(), reinterpret_cast<mach_vm_address_t*>(&base), size,
base ? VM_FLAGS_FIXED : VM_FLAGS_ANYWHERE);
if (ret != KERN_SUCCESS)
{
DEV_LOG("mach_vm_allocate() returned {}", ret);
return nullptr;
}
ret = mach_vm_protect(mach_task_self(), reinterpret_cast<mach_vm_address_t>(base), size, false, MachProt(mode));
if (ret != KERN_SUCCESS)
{
DEV_LOG("mach_vm_protect() returned {}", ret);
mach_vm_deallocate(mach_task_self(), reinterpret_cast<mach_vm_address_t>(base), size);
return nullptr;
}
return base;
}
void HostSys::Munmap(void* base, size_t size)
{
if (!base)
return;
mach_vm_deallocate(mach_task_self(), reinterpret_cast<mach_vm_address_t>(base), size);
}
void HostSys::MemProtect(void* baseaddr, size_t size, const PageProtectionMode& mode)
{
pxAssertMsg((size & (__pagesize - 1)) == 0, "Size is page aligned");
kern_return_t res = mach_vm_protect(mach_task_self(), reinterpret_cast<mach_vm_address_t>(baseaddr), size, false,
MachProt(mode));
if (res != KERN_SUCCESS) [[unlikely]]
{
ERROR_LOG("mach_vm_protect() failed: {}", res);
pxFailRel("mach_vm_protect() failed");
}
}
std::string HostSys::GetFileMappingName(const char* prefix)
{
// name actually is not used.
return {};
}
void* HostSys::CreateSharedMemory(const char* name, size_t size)
{
mach_vm_size_t vm_size = size;
mach_port_t port;
const kern_return_t res = mach_make_memory_entry_64(
mach_task_self(), &vm_size, 0, MAP_MEM_NAMED_CREATE | VM_PROT_READ | VM_PROT_WRITE, &port, MACH_PORT_NULL);
if (res != KERN_SUCCESS)
{
ERROR_LOG("mach_make_memory_entry_64() failed: {}", res);
return nullptr;
}
return reinterpret_cast<void*>(static_cast<uintptr_t>(port));
}
void HostSys::DestroySharedMemory(void* ptr)
{
mach_port_deallocate(mach_task_self(), static_cast<mach_port_t>(reinterpret_cast<uintptr_t>(ptr)));
}
void* HostSys::MapSharedMemory(void* handle, size_t offset, void* baseaddr, size_t size, const PageProtectionMode& mode)
{
mach_vm_address_t ptr = reinterpret_cast<mach_vm_address_t>(baseaddr);
const kern_return_t res = mach_vm_map(mach_task_self(), &ptr, size, 0, baseaddr ? VM_FLAGS_FIXED : VM_FLAGS_ANYWHERE,
static_cast<mach_port_t>(reinterpret_cast<uintptr_t>(handle)), offset, FALSE,
MachProt(mode), VM_PROT_READ | VM_PROT_WRITE, VM_INHERIT_NONE);
if (res != KERN_SUCCESS)
{
ERROR_LOG("mach_vm_map() failed: {}", res);
return nullptr;
}
return reinterpret_cast<void*>(ptr);
}
void HostSys::UnmapSharedMemory(void* baseaddr, size_t size)
{
const kern_return_t res = mach_vm_deallocate(mach_task_self(), reinterpret_cast<mach_vm_address_t>(baseaddr), size);
if (res != KERN_SUCCESS)
pxFailRel("Failed to unmap shared memory");
}
#ifdef _M_ARM64
void HostSys::FlushInstructionCache(void* address, u32 size)
{
__builtin___clear_cache(reinterpret_cast<char*>(address), reinterpret_cast<char*>(address) + size);
}
#endif
SharedMemoryMappingArea::SharedMemoryMappingArea(u8* base_ptr, size_t size, size_t num_pages)
: m_base_ptr(base_ptr)
, m_size(size)
, m_num_pages(num_pages)
{
}
SharedMemoryMappingArea::~SharedMemoryMappingArea()
{
pxAssertRel(m_num_mappings == 0, "No mappings left");
if (mach_vm_deallocate(mach_task_self(), reinterpret_cast<mach_vm_address_t>(m_base_ptr), m_size) != KERN_SUCCESS)
pxFailRel("Failed to release shared memory area");
}
std::unique_ptr<SharedMemoryMappingArea> SharedMemoryMappingArea::Create(size_t size)
{
pxAssertRel(Common::IsAlignedPow2(size, __pagesize), "Size is page aligned");
mach_vm_address_t alloc;
const kern_return_t res =
mach_vm_map(mach_task_self(), &alloc, size, 0, VM_FLAGS_ANYWHERE,
MEMORY_OBJECT_NULL, 0, false, VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_NONE);
if (res != KERN_SUCCESS)
{
ERROR_LOG("mach_vm_map() failed: {}", res);
return {};
}
return std::unique_ptr<SharedMemoryMappingArea>(new SharedMemoryMappingArea(reinterpret_cast<u8*>(alloc), size, size / __pagesize));
}
u8* SharedMemoryMappingArea::Map(void* file_handle, size_t file_offset, void* map_base, size_t map_size, const PageProtectionMode& mode)
{
pxAssert(static_cast<u8*>(map_base) >= m_base_ptr && static_cast<u8*>(map_base) < (m_base_ptr + m_size));
const kern_return_t res =
mach_vm_map(mach_task_self(), reinterpret_cast<mach_vm_address_t*>(&map_base), map_size, 0, VM_FLAGS_OVERWRITE,
static_cast<mach_port_t>(reinterpret_cast<uintptr_t>(file_handle)), file_offset, false,
MachProt(mode), VM_PROT_READ | VM_PROT_WRITE, VM_INHERIT_NONE);
if (res != KERN_SUCCESS) [[unlikely]]
{
ERROR_LOG("mach_vm_map() failed: {}", res);
return nullptr;
}
m_num_mappings++;
return static_cast<u8*>(map_base);
}
bool SharedMemoryMappingArea::Unmap(void* map_base, size_t map_size)
{
pxAssert(static_cast<u8*>(map_base) >= m_base_ptr && static_cast<u8*>(map_base) < (m_base_ptr + m_size));
const kern_return_t res =
mach_vm_map(mach_task_self(), reinterpret_cast<mach_vm_address_t*>(&map_base), map_size, 0, VM_FLAGS_OVERWRITE,
MEMORY_OBJECT_NULL, 0, false, VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_NONE);
if (res != KERN_SUCCESS) [[unlikely]]
{
ERROR_LOG("mach_vm_map() failed: {}", res);
return false;
}
m_num_mappings--;
return true;
}
#ifdef _M_ARM64
static thread_local int s_code_write_depth = 0;
void HostSys::BeginCodeWrite()
{
if ((s_code_write_depth++) == 0)
pthread_jit_write_protect_np(0);
}
void HostSys::EndCodeWrite()
{
pxAssert(s_code_write_depth > 0);
if ((--s_code_write_depth) == 0)
pthread_jit_write_protect_np(1);
}
#endif
#endif

29
common/Linux/LnxHostSys.cpp
View File

@ -29,14 +29,6 @@
#define MAP_ANONYMOUS MAP_ANON
#endif
// MacOS does not have MAP_FIXED_NOREPLACE, which means our mappings are
// vulnerable to races with the main/Qt threads. TODO: Investigate using
// mach_vm_allocate()/mach_vm_map() instead of mmap(), but Apple's
// documentation for these routines is non-existant...
#if defined(__APPLE__) && !defined(MAP_FIXED_NOREPLACE)
#define MAP_FIXED_NOREPLACE MAP_FIXED
#endif
// FreeBSD does not have MAP_FIXED_NOREPLACE, but does have MAP_EXCL.
// MAP_FIXED combined with MAP_EXCL behaves like MAP_FIXED_NOREPLACE.
#if defined(__FreeBSD__) && !defined(MAP_FIXED_NOREPLACE)
@ -230,6 +222,8 @@ bool PageFaultHandler::Install(Error* error)
return true;
}
#ifndef __APPLE__
static __ri uint LinuxProt(const PageProtectionMode& mode)
{
u32 lnxmode = 0;
@ -406,23 +400,6 @@ bool SharedMemoryMappingArea::Unmap(void* map_base, size_t map_size)
return true;
}
#endif
#if defined(_M_ARM64) && defined(__APPLE__)
static thread_local int s_code_write_depth = 0;
void HostSys::BeginCodeWrite()
{
if ((s_code_write_depth++) == 0)
pthread_jit_write_protect_np(0);
}
void HostSys::EndCodeWrite()
{
pxAssert(s_code_write_depth > 0);
if ((--s_code_write_depth) == 0)
pthread_jit_write_protect_np(1);
}
#endif // __APPLE__
#endif