cpp_support.cpp

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// SPDX-License-Identifier: GPL-3.0-or-later
 
#include <cxxabi.h>
#include <mos/lib/sync/mutex.h>
#include <mos_stdlib.h>
#include <new>
 
void *__dso_handle = (void *) 0xcdcdcdcdcdcdcdcd; // this pointer should never get dereferenced
 
void *operator new(size_t size)
{
    return slab_alloc(size);
}
 
void *operator new[](size_t size)
{
    return slab_alloc(size);
}
 
void operator delete(void *p) noexcept
{
    kfree(p);
}
 
void operator delete(void *ptr, long unsigned int sz)
{
    MOS_UNUSED(sz);
    kfree(ptr);
}
 
void operator delete[](void *ptr, long unsigned int sz)
{
    MOS_UNUSED(sz);
    kfree(ptr);
}
 
void operator delete[](void *p) noexcept
{
    kfree(p);
}
 
extern "C" int __cxa_atexit(void (*destructor)(void *), void *arg, void *dso)
{
    MOS_UNUSED(destructor);
    MOS_UNUSED(arg);
    MOS_UNUSED(dso);
    return 0;
}
 
// static scoped variable constructor support
 
extern "C" int abi::__cxa_guard_acquire(abi::__guard *g)
{
    // TODO: stub functions, implement 64-bit mutexes/futex-word
    __atomic_thread_fence(__ATOMIC_ACQUIRE);
    long val;
    __atomic_load(g, &val, __ATOMIC_RELAXED);
    return !val;
}
 
// this function is called when a constructor finishes
extern "C" void abi::__cxa_guard_release(abi::__guard *g)
{
    long zero = 0;
    __atomic_store(g, &zero, __ATOMIC_RELEASE);
    __atomic_thread_fence(__ATOMIC_RELEASE);
}
 
// this function is called when a constructor throws an exception
extern "C" void abi::__cxa_guard_abort(abi::__guard *)
{
}