/*
* Copyright (c) 2006 Ondrej Palkovsky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup libcmips32
* @{
*/
/** @file
* @ingroup libcmips32eb
*/
/* TLS for MIPS is described in http://www.linux-mips.org/wiki/NPTL */
#ifndef LIBC_mips32THREAD_H_
#define LIBC_mips32THREAD_H_
/* I did not find any specification (neither MIPS nor PowerPC), but
* as I found it
* - it uses Variant II
* - TCB is at Address(First TLS Block)+0x7000.
* - DTV is at Address(First TLS Block)+0x8000
* - What would happen if the TLS data was larger then 0x7000?
* - The linker never accesses DTV directly, has the second definition any
* sense?
* We will make it this way:
* - TCB is at TP-0x7000-sizeof(tcb)
* - No assumption about DTV etc., but it will not have a fixed address
*/
#define MIPS_TP_OFFSET 0x7000
typedef struct {
void *pst_data;
} tcb_t;
static inline void __tcb_set(tcb_t *tcb)
{
void *tp = tcb;
tp += MIPS_TP_OFFSET + sizeof(tcb_t);
asm volatile ("add $27, %0, $0" : : "r"(tp)); /* Move tls to K1 */
}
static inline tcb_t * __tcb_get(void)
{
void * retval;
asm volatile("add %0, $27, $0" : "=r"(retval));
return (tcb_t *)(retval - MIPS_TP_OFFSET - sizeof(tcb_t));
}
#endif
/** @}
*/