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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "tls_get_addr.s"
/*
* To make thread-local storage accesses as fast as possible, we
* hand-craft the __tls_get_addr() function below, from this C code:
* void *
* __tls_get_addr(TLS_index *tls_index)
* {
* ulwp_t *self = curthread;
* tls_t *tlsent = self->ul_tlsent;
* ulong_t moduleid;
* caddr_t base;
*
* if ((moduleid = tls_index->ti_moduleid) < self->ul_ntlsent &&
* (base = tlsent[moduleid].tls_data) != NULL)
* return (base + tls_index->ti_tlsoffset);
*
* return (slow_tls_get_addr(tls_index));
* }
*
* ___tls_get_addr() is identical to __tls_get_addr() except that it
* assumes its argument is passed in %eax rather than on the stack.
*/
#include "SYS.h"
#include <assym.h>
ENTRY_NP(__tls_get_addr)
movl 4(%esp), %eax
ALTENTRY(___tls_get_addr)
movl %gs:UL_TLSENT, %edx
movl TI_MODULEID (%eax), %ecx
cmpl %gs:UL_NTLSENT, %ecx
jae 1f
movl TLS_DATA (%edx,%ecx,SIZEOF_TLS_T), %edx
testl %edx, %edx
je 1f
addl TI_TLSOFFSET (%eax), %edx
movl %edx, %eax
ret
1:
pushl %ebp
movl %esp, %ebp
pushl %eax
call slow_tls_get_addr
addl $4, %esp
leave
ret
SET_SIZE(___tls_get_addr)
SET_SIZE(__tls_get_addr)
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