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rewrote libc_cxa

This commit is contained in:
georgemoralis 2023-10-16 20:49:52 +03:00
parent f916fd48b0
commit 044628ab13
5 changed files with 164 additions and 58 deletions
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2
CMakeLists.txt
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@ -27,6 +27,8 @@ set(LIBC_SOURCES src/Emulator/HLE/Libraries/LibC/Libc.cpp
src/Emulator/HLE/Libraries/LibC/Libc.h
src/Emulator/HLE/Libraries/LibC/printf.h
src/Emulator/HLE/Libraries/LibC/va_ctx.h
src/Emulator/HLE/Libraries/LibC/libc_cxa.cpp
src/Emulator/HLE/Libraries/LibC/libc_cxa.h
)
set(USERSERVICE_SOURCES src/Emulator/HLE/Libraries/LibUserService/user_service.cpp
src/Emulator/HLE/Libraries/LibUserService/user_service.h

60
src/Core/PS4/HLE/LibC.cpp
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@ -5,6 +5,7 @@
#include "../Loader/Elf.h"
#include "Emulator/HLE/Libraries/LibC/libc.h"
#include "Emulator/HLE/Libraries/LibC/libc_cxa.h"
#include "ErrorCodes.h"
#include "Libs.h"
@ -17,60 +18,6 @@ static PS4_SYSV_ABI void init_env() // every game/demo should probably
// dummy no need atm
}
static pthread_mutex_t __guard_mutex;
static pthread_once_t __once_control = PTHREAD_ONCE_INIT;
static void recursiveMutex() {
pthread_mutexattr_t recursiveMutexAttr;
pthread_mutexattr_init(&recursiveMutexAttr);
pthread_mutexattr_settype(&recursiveMutexAttr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&__guard_mutex, &recursiveMutexAttr);
}
static pthread_mutex_t* mutex_quard() {
pthread_once(&__once_control, &recursiveMutex);
return &__guard_mutex;
}
int PS4_SYSV_ABI __cxa_guard_acquire(u64* guard_object) {
if ((*((uint8_t*)guard_object) != 0)) // low 8 bits checks if its already init
{
return 0;
}
int result = ::pthread_mutex_lock(mutex_quard());
if (result != 0) {
BREAKPOINT();
}
// Check if another thread has completed initializer run
if ((*((uint8_t*)guard_object) != 0)) { // check again if other thread init it
int result = ::pthread_mutex_unlock(mutex_quard());
if (result != 0) {
BREAKPOINT();
}
return 0;
}
if (((uint8_t*)guard_object)[1] != 0) { // the second lowest byte marks if it's being used by a thread
BREAKPOINT();
}
// mark this guard object as being in use
((uint8_t*)guard_object)[1] = 1;
return 1;
}
void PS4_SYSV_ABI __cxa_guard_release(u64* guard_object) {
*((uint8_t*)guard_object) = 1; // mark it as done
// release global mutex
int result = ::pthread_mutex_unlock(mutex_quard());
if (result != 0) {
BREAKPOINT();
}
}
static PS4_SYSV_ABI void catchReturnFromMain(int status) {
// dummy
}
@ -110,8 +57,9 @@ void PS4_SYSV_ABI qsort(void* ptr, size_t count,size_t size, int(PS4_SYSV_ABI* c
void LibC_Register(SymbolsResolver* sym) {
LIB_FUNCTION("bzQExy189ZI", "libc", 1, "libc", 1, 1, init_env);
LIB_FUNCTION("3GPpjQdAMTw", "libc", 1, "libc", 1, 1, __cxa_guard_acquire);
LIB_FUNCTION("9rAeANT2tyE", "libc", 1, "libc", 1, 1, __cxa_guard_release);
LIB_FUNCTION("3GPpjQdAMTw", "libc", 1, "libc", 1, 1, Emulator::HLE::Libraries::LibC::Cxa::__cxa_guard_acquire);
LIB_FUNCTION("9rAeANT2tyE", "libc", 1, "libc", 1, 1, Emulator::HLE::Libraries::LibC::Cxa::__cxa_guard_release);
LIB_FUNCTION("2emaaluWzUw", "libc", 1, "libc", 1, 1, Emulator::HLE::Libraries::LibC::Cxa::__cxa_guard_abort);
LIB_FUNCTION("DfivPArhucg", "libc", 1, "libc", 1, 1, Emulator::HLE::Libraries::LibC::memcmp);
LIB_FUNCTION("Q3VBxCXhUHs", "libc", 1, "libc", 1, 1, Emulator::HLE::Libraries::LibC::memcpy);
LIB_FUNCTION("8zTFvBIAIN8", "libc", 1, "libc", 1, 1, Emulator::HLE::Libraries::LibC::memset);

2
src/Core/PS4/HLE/LibC.h
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@ -9,7 +9,5 @@ namespace HLE::Libs::LibC {
static PS4_SYSV_ABI void init_env();
static PS4_SYSV_ABI void _Assert();
static PS4_SYSV_ABI void catchReturnFromMain(int status);
int PS4_SYSV_ABI __cxa_guard_acquire(u64* guard_object);
void PS4_SYSV_ABI __cxa_guard_release(u64* guard_object);
};

147
src/Emulator/HLE/Libraries/LibC/libc_cxa.cpp Normal file
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@ -0,0 +1,147 @@
#include "libc_cxa.h"
#include "debug.h"
#include "Util/log.h"
// adapted from https://opensource.apple.com/source/libcppabi/libcppabi-14/src/cxa_guard.cxx.auto.html
namespace Emulator::HLE::Libraries::LibC::Cxa {
constexpr bool log_file_cxa = true; // disable it to disable logging
// This file implements the __cxa_guard_* functions as defined at:
// http://www.codesourcery.com/public/cxx-abi/abi.html
//
// The goal of these functions is to support thread-safe, one-time
// initialization of function scope variables. The compiler will generate
// code like the following:
//
// if ( obj_guard.first_byte == 0 ) {
// if ( __cxa_guard_acquire(&obj_guard) ) {
// try {
// ... initialize the object ...;
// }
// catch (...) {
// __cxa_guard_abort(&obj_guard);
// throw;
// }
// ... queue object destructor with __cxa_atexit() ...;
// __cxa_guard_release(&obj_guard);
// }
// }
//
// Notes:
// ojb_guard is a 64-bytes in size and statically initialized to zero.
//
// Section 6.7 of the C++ Spec says "If control re-enters the declaration
// recursively while the object is being initialized, the behavior is
// undefined". This implementation calls abort().
//
// Note don't use function local statics to avoid use of cxa functions...
static pthread_mutex_t __guard_mutex;
static pthread_once_t __once_control = PTHREAD_ONCE_INIT;
static void makeRecusiveMutex() {
pthread_mutexattr_t recursiveMutexAttr;
pthread_mutexattr_init(&recursiveMutexAttr);
pthread_mutexattr_settype(&recursiveMutexAttr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&__guard_mutex, &recursiveMutexAttr);
}
__attribute__((noinline)) static pthread_mutex_t* guard_mutex() {
pthread_once(&__once_control, &makeRecusiveMutex);
return &__guard_mutex;
}
// helper functions for getting/setting flags in guard_object
static bool initializerHasRun(u64* guard_object) { return (*((u08*)guard_object) != 0); }
static void setInitializerHasRun(u64* guard_object) { *((u08*)guard_object) = 1; }
static bool inUse(u64* guard_object) { return (((u08*)guard_object)[1] != 0); }
static void setInUse(u64* guard_object) { ((u08*)guard_object)[1] = 1; }
static void setNotInUse(u64* guard_object) { ((u08*)guard_object)[1] = 0; }
//
// Returns 1 if the caller needs to run the initializer and then either
// call __cxa_guard_release() or __cxa_guard_abort(). If zero is returned,
// then the initializer has already been run. This function blocks
// if another thread is currently running the initializer. This function
// aborts if called again on the same guard object without an intervening
// call to __cxa_guard_release() or __cxa_guard_abort().
//
int PS4_SYSV_ABI __cxa_guard_acquire(u64* guard_object) {
// Double check that the initializer has not already been run
if (initializerHasRun(guard_object)) return 0;
// We now need to acquire a lock that allows only one thread
// to run the initializer. If a different thread calls
// __cxa_guard_acquire() with the same guard object, we want
// that thread to block until this thread is done running the
// initializer and calls __cxa_guard_release(). But if the same
// thread calls __cxa_guard_acquire() with the same guard object,
// we want to abort.
// To implement this we have one global pthread recursive mutex
// shared by all guard objects, but only one at a time.
int result = ::pthread_mutex_lock(guard_mutex());
if (result != 0) {
LOG_TRACE_IF(log_file_cxa, "__cxa_guard_acquire(): pthread_mutex_lock failed with {}\n",result);
}
// At this point all other threads will block in __cxa_guard_acquire()
// Check if another thread has completed initializer run
if (initializerHasRun(guard_object)) {
int result = ::pthread_mutex_unlock(guard_mutex());
if (result != 0) {
LOG_TRACE_IF(log_file_cxa,"__cxa_guard_acquire(): pthread_mutex_unlock failed with {}\n",result);
}
return 0;
}
// The pthread mutex is recursive to allow other lazy initialized
// function locals to be evaluated during evaluation of this one.
// But if the same thread can call __cxa_guard_acquire() on the
// *same* guard object again, we call abort();
if (inUse(guard_object)) {
LOG_TRACE_IF(log_file_cxa,"__cxa_guard_acquire(): initializer for function local static variable called enclosing function\n");
}
// mark this guard object as being in use
setInUse(guard_object);
// return non-zero to tell caller to run initializer
return 1;
}
//
// Sets the first byte of the guard_object to a non-zero value.
// Releases any locks acquired by __cxa_guard_acquire().
//
void PS4_SYSV_ABI __cxa_guard_release(u64* guard_object) {
// first mark initalizer as having been run, so
// other threads won't try to re-run it.
setInitializerHasRun(guard_object);
// release global mutex
int result = ::pthread_mutex_unlock(guard_mutex());
if (result != 0) {
LOG_TRACE_IF(log_file_cxa,"__cxa_guard_acquire(): pthread_mutex_unlock failed with {}\n",result);
}
}
//
// Releases any locks acquired by __cxa_guard_acquire().
//
void PS4_SYSV_ABI __cxa_guard_abort(u64* guard_object) {
int result = ::pthread_mutex_unlock(guard_mutex());
if (result != 0) {
LOG_TRACE_IF(log_file_cxa,"__cxa_guard_abort(): pthread_mutex_unlock failed with {}\n",result);
}
// now reset state, so possible to try to initialize again
setNotInUse(guard_object);
}
} // namespace Emulator::HLE::Libraries::LibC::Cxa

11
src/Emulator/HLE/Libraries/LibC/libc_cxa.h Normal file
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@ -0,0 +1,11 @@
#pragma once
#define _TIMESPEC_DEFINED
#include <pthread.h>
#include <types.h>
namespace Emulator::HLE::Libraries::LibC::Cxa {
int PS4_SYSV_ABI __cxa_guard_acquire(u64* guard_object);
void PS4_SYSV_ABI __cxa_guard_release(u64* guard_object);
void PS4_SYSV_ABI __cxa_guard_abort(u64* guard_object);
} // namespace Emulator::HLE::Libraries::LibC::Cxa