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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/libc++/builtins.C $
//
// IBM CONFIDENTIAL
//
// COPYRIGHT International Business Machines Corp. 2010 - 2011
//
// p1
//
// Object Code Only (OCO) source materials
// Licensed Internal Code Source Materials
// IBM HostBoot Licensed Internal Code
//
// The source code for this program is not published or other-
// wise divested of its trade secrets, irrespective of what has
// been deposited with the U.S. Copyright Office.
//
// Origin: 30
//
// IBM_PROLOG_END
#include <stdint.h>
#include <stdlib.h>
#include <arch/ppc.H>
#include <util/locked/list.H>
void* operator new(size_t s)
{
return malloc(s);
};
void* operator new[](size_t s)
{
return malloc(s);
};
void* operator new(size_t s, void *place)
{
return place;
}
void* operator new[](size_t s, void *place)
{
return place;
}
void operator delete(void* p)
{
return free(p);
};
void operator delete[](void* p)
{
return free(p);
};
extern "C" int __cxa_guard_acquire(volatile uint64_t* gv)
{
// States:
// 0 -> uninitialized
// 1 -> locked
// 2 -> unlocked and initialized
uint32_t v = __sync_val_compare_and_swap((volatile uint32_t*)gv, 0, 1);
if (v == 0)
return 1;
if (v == 2)
return 0;
// Wait for peer thread to perform initialization (state 2).
while(2 != *(volatile uint32_t*)gv);
// Instruction barrier to ensure value is set before later loads execute.
isync();
return 0;
}
extern "C" void __cxa_guard_release(volatile uint64_t* gv)
{
// Memory barrier to ensure all preceeding writes have completed before
// releasing guard.
lwsync();
(*(volatile uint32_t*)gv) = 2;
return;
}
extern "C" void __cxa_pure_virtual()
{
// TODO: Add better code for invalid pure virtual call.
while(1);
}
// ----------------------------------------------------------------------------
// Module exit support
// ----------------------------------------------------------------------------
// This one is just for the base object. Each module has it's own giving
// each module a unique value for __dso_handle.
void* __dso_handle = (void*) &__dso_handle;
struct DtorEntry_t
{
typedef void * key_type;
key_type key;
void (*dtor)(void*);
void * arg;
void * dso_handle;
DtorEntry_t * next;
DtorEntry_t * prev;
};
Util::Locked::List<DtorEntry_t, DtorEntry_t::key_type> g_dtorRegistry;
/**
* Call all the static destructors for the module identified by i_dso_handle
* @param[in] i_dso_handle unique identifier for a module
* @post matching dtor functions called and then removed from the dtor registry
*/
void call_dtors(void * i_dso_handle)
{
DtorEntry_t * entry = NULL;
// A module is never exited by different threads so
// assume no locking needed here.
while( NULL != (entry = g_dtorRegistry.find(i_dso_handle)) )
{
g_dtorRegistry.erase(entry); // remove from list
(*(entry->dtor))(entry->arg);
delete entry;
}
}
extern "C" int __cxa_atexit(void (*i_dtor)(void*),
void* i_arg,
void* i_dso_handle)
{
// Base kernel code may try to call this before mem heap is
// available - so don't add it.
// TODO - Only need dtors for extended image modules
if(i_dso_handle != __dso_handle)
{
DtorEntry_t * entry = new DtorEntry_t;
entry->key = i_dso_handle;
entry->dtor = i_dtor;
entry->arg = i_arg;
g_dtorRegistry.insert(entry);
}
return 0;
}
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