mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-07 13:54:33 +00:00
204 lines
4.9 KiB
C
204 lines
4.9 KiB
C
/* TLS emulation.
|
|
Copyright (C) 2006-2015 Free Software Foundation, Inc.
|
|
Contributed by Jakub Jelinek <jakub@redhat.com>.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "tconfig.h"
|
|
#include "tsystem.h"
|
|
#include "coretypes.h"
|
|
#include "tm.h"
|
|
#include "libgcc_tm.h"
|
|
#include "gthr.h"
|
|
|
|
typedef unsigned int word __attribute__((mode(word)));
|
|
typedef unsigned int pointer __attribute__((mode(pointer)));
|
|
|
|
struct __emutls_object
|
|
{
|
|
word size;
|
|
word align;
|
|
union {
|
|
pointer offset;
|
|
void *ptr;
|
|
} loc;
|
|
void *templ;
|
|
};
|
|
|
|
struct __emutls_array
|
|
{
|
|
pointer size;
|
|
void **data[];
|
|
};
|
|
|
|
void *__emutls_get_address (struct __emutls_object *);
|
|
void __emutls_register_common (struct __emutls_object *, word, word, void *);
|
|
|
|
#ifdef __GTHREADS
|
|
#ifdef __GTHREAD_MUTEX_INIT
|
|
static __gthread_mutex_t emutls_mutex = __GTHREAD_MUTEX_INIT;
|
|
#else
|
|
static __gthread_mutex_t emutls_mutex;
|
|
#endif
|
|
static __gthread_key_t emutls_key;
|
|
static pointer emutls_size;
|
|
|
|
static void
|
|
emutls_destroy (void *ptr)
|
|
{
|
|
struct __emutls_array *arr = ptr;
|
|
pointer size = arr->size;
|
|
pointer i;
|
|
|
|
for (i = 0; i < size; ++i)
|
|
{
|
|
if (arr->data[i])
|
|
free (arr->data[i][-1]);
|
|
}
|
|
|
|
free (ptr);
|
|
}
|
|
|
|
static void
|
|
emutls_init (void)
|
|
{
|
|
#ifndef __GTHREAD_MUTEX_INIT
|
|
__GTHREAD_MUTEX_INIT_FUNCTION (&emutls_mutex);
|
|
#endif
|
|
if (__gthread_key_create (&emutls_key, emutls_destroy) != 0)
|
|
abort ();
|
|
}
|
|
#endif
|
|
|
|
static void *
|
|
emutls_alloc (struct __emutls_object *obj)
|
|
{
|
|
void *ptr;
|
|
void *ret;
|
|
|
|
/* We could use here posix_memalign if available and adjust
|
|
emutls_destroy accordingly. */
|
|
if (obj->align <= sizeof (void *))
|
|
{
|
|
ptr = malloc (obj->size + sizeof (void *));
|
|
if (ptr == NULL)
|
|
abort ();
|
|
((void **) ptr)[0] = ptr;
|
|
ret = ptr + sizeof (void *);
|
|
}
|
|
else
|
|
{
|
|
ptr = malloc (obj->size + sizeof (void *) + obj->align - 1);
|
|
if (ptr == NULL)
|
|
abort ();
|
|
ret = (void *) (((pointer) (ptr + sizeof (void *) + obj->align - 1))
|
|
& ~(pointer)(obj->align - 1));
|
|
((void **) ret)[-1] = ptr;
|
|
}
|
|
|
|
if (obj->templ)
|
|
memcpy (ret, obj->templ, obj->size);
|
|
else
|
|
memset (ret, 0, obj->size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void *
|
|
__emutls_get_address (struct __emutls_object *obj)
|
|
{
|
|
if (! __gthread_active_p ())
|
|
{
|
|
if (__builtin_expect (obj->loc.ptr == NULL, 0))
|
|
obj->loc.ptr = emutls_alloc (obj);
|
|
return obj->loc.ptr;
|
|
}
|
|
|
|
#ifndef __GTHREADS
|
|
abort ();
|
|
#else
|
|
pointer offset = __atomic_load_n (&obj->loc.offset, __ATOMIC_ACQUIRE);
|
|
|
|
if (__builtin_expect (offset == 0, 0))
|
|
{
|
|
static __gthread_once_t once = __GTHREAD_ONCE_INIT;
|
|
__gthread_once (&once, emutls_init);
|
|
__gthread_mutex_lock (&emutls_mutex);
|
|
offset = obj->loc.offset;
|
|
if (offset == 0)
|
|
{
|
|
offset = ++emutls_size;
|
|
__atomic_store_n (&obj->loc.offset, offset, __ATOMIC_RELEASE);
|
|
}
|
|
__gthread_mutex_unlock (&emutls_mutex);
|
|
}
|
|
|
|
struct __emutls_array *arr = __gthread_getspecific (emutls_key);
|
|
if (__builtin_expect (arr == NULL, 0))
|
|
{
|
|
pointer size = offset + 32;
|
|
arr = calloc (size + 1, sizeof (void *));
|
|
if (arr == NULL)
|
|
abort ();
|
|
arr->size = size;
|
|
__gthread_setspecific (emutls_key, (void *) arr);
|
|
}
|
|
else if (__builtin_expect (offset > arr->size, 0))
|
|
{
|
|
pointer orig_size = arr->size;
|
|
pointer size = orig_size * 2;
|
|
if (offset > size)
|
|
size = offset + 32;
|
|
arr = realloc (arr, (size + 1) * sizeof (void *));
|
|
if (arr == NULL)
|
|
abort ();
|
|
arr->size = size;
|
|
memset (arr->data + orig_size, 0,
|
|
(size - orig_size) * sizeof (void *));
|
|
__gthread_setspecific (emutls_key, (void *) arr);
|
|
}
|
|
|
|
void *ret = arr->data[offset - 1];
|
|
if (__builtin_expect (ret == NULL, 0))
|
|
{
|
|
ret = emutls_alloc (obj);
|
|
arr->data[offset - 1] = ret;
|
|
}
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
__emutls_register_common (struct __emutls_object *obj,
|
|
word size, word align, void *templ)
|
|
{
|
|
if (obj->size < size)
|
|
{
|
|
obj->size = size;
|
|
obj->templ = NULL;
|
|
}
|
|
if (obj->align < align)
|
|
obj->align = align;
|
|
if (templ && size == obj->size)
|
|
obj->templ = templ;
|
|
}
|