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Apple M1: Build, Analytics, and Memory Management

Browse Source 
Analytics:
- Incorporated fix to allow the full set of analytics that was recommended by
  spotlightishere

BuildMacOSUniversalBinary:
- The x86_64 slice for a universal binary is now built for 10.12
- The universal binary build script now can be configured though command line
  options instead of modifying the script itself.
- os.system calls were replaced with equivalent subprocess calls
- Formatting was reworked to be more PEP 8 compliant
- The script was refactored to make it more modular
- The com.apple.security.cs.disable-library-validation entitlement was removed

Memory Management:
- Changed the JITPageWrite*Execute*() functions to incorporate support for
  nesting

Other:
- Fixed several small lint errors
- Fixed doc and formatting mistakes
- Several small refactors to make things clearer
This commit is contained in:
Skyler Saleh
2021-01-16 20:31:48 -08:00
parent 4ecb3084b7
commit 948764d37b
12 changed files with 406 additions and 180 deletions
Download Patch File Download Diff File Expand all files Collapse all files

69
Source/Core/Common/MemoryUtil.cpp
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@ -39,12 +39,11 @@ void* AllocateExecutableMemory(size_t size)
#if defined(_WIN32)
void* ptr = VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
#else
int map_flags =MAP_ANON | MAP_PRIVATE;
int map_flags = MAP_ANON | MAP_PRIVATE;
#if defined(_M_ARM_64) && defined(__APPLE__)
map_flags |= MAP_JIT;
#endif
void* ptr =
mmap(nullptr, size, PROT_READ | PROT_WRITE |PROT_EXEC , map_flags, -1, 0);
void* ptr = mmap(nullptr, size, PROT_READ | PROT_WRITE | PROT_EXEC, map_flags, -1, 0);
if (ptr == MAP_FAILED)
ptr = nullptr;
#endif
@ -54,7 +53,19 @@ void* AllocateExecutableMemory(size_t size)
return ptr;
}
// Certain platforms (Mac OS X on ARM) enforce that a single thread can only have write or
// This function is used to provide a counter for the JITPageWrite*Execute*
// functions to enable nesting. The static variable is wrapped in a a function
// to allow those functions to be called inside of the constructor of a static
// variable portably.
//
// The variable is thread_local as the W^X mode is specific to each running thread.
static int& JITPageWriteNestCounter()
{
static thread_local int nest_counter = 0;
return nest_counter;
}
// Certain platforms (Mac OS on ARM) enforce that a single thread can only have write or
// execute permissions to pages at any given point of time. The two below functions
// are used to toggle between having write permissions or execute permissions.
//
@ -66,20 +77,52 @@ void* AllocateExecutableMemory(size_t size)
// PrepareInstructionStreamForJIT();
// JITPageWriteDisableExecuteEnable();
//Allows a thread to write to executable memory, but not execute the data.
void JITPageWriteEnableExecuteDisable(){
// These functions can be nested, in which case execution will only be enabled
// after the call to the JITPageWriteDisableExecuteEnable from the top most
// nesting level. Example:
// [JIT page is in execute mode for the thread]
// JITPageWriteEnableExecuteDisable();
// [JIT page is in write mode for the thread]
// JITPageWriteEnableExecuteDisable();
// [JIT page is in write mode for the thread]
// JITPageWriteDisableExecuteEnable();
// [JIT page is in write mode for the thread]
// JITPageWriteDisableExecuteEnable();
// [JIT page is in execute mode for the thread]
// Allows a thread to write to executable memory, but not execute the data.
void JITPageWriteEnableExecuteDisable()
{
#if defined(_M_ARM_64) && defined(__APPLE__)
if (__builtin_available(macOS 11.0, *)) {
pthread_jit_write_protect_np(0);
if (JITPageWriteNestCounter() == 0)
{
if (__builtin_available(macOS 11.0, *))
{
pthread_jit_write_protect_np(0);
}
}
#endif
JITPageWriteNestCounter()++;
}
//Allows a thread to execute memory allocated for execution, but not write to it.
void JITPageWriteDisableExecuteEnable(){
// Allows a thread to execute memory allocated for execution, but not write to it.
void JITPageWriteDisableExecuteEnable()
{
JITPageWriteNestCounter()--;
// Sanity check the NestCounter to identify underflow
// This can indicate the calls to JITPageWriteDisableExecuteEnable()
// are not matched with previous calls to JITPageWriteEnableExecuteDisable()
if (JITPageWriteNestCounter() < 0)
PanicAlertFmt("JITPageWriteNestCounter() underflowed");
#if defined(_M_ARM_64) && defined(__APPLE__)
if (__builtin_available(macOS 11.0, *)) {
pthread_jit_write_protect_np(1);
if (JITPageWriteNestCounter() == 0)
{
if (__builtin_available(macOS 11.0, *))
{
pthread_jit_write_protect_np(1);
}
}
#endif
}