WebSVN – HelenOS-historic – Diff – /uspace/trunk/libc/arch/mips32/include/thread.h


/*
 * 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
 */
 
/* 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
 
 /** @}
 */
 
 

Subversion Repositories HelenOS-historic

(root)/uspace/trunk/libc/arch/mips32/include/thread.h – Rev 1129 → 1656

Rev 1129		Rev 1656
1	/*	1	/*
2	* Copyright (C) 2006 Ondrej Palkovsky	2	* Copyright (C) 2006 Ondrej Palkovsky
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
-		29	/** @addtogroup libcmips32
-		30	* @{
-		31	*/
-		32	/** @file
-		33	*/
-		34
29	/* TLS for MIPS is described in http://www.linux-mips.org/wiki/NPTL */	35	/* TLS for MIPS is described in http://www.linux-mips.org/wiki/NPTL */
30		36
31	#ifndef __LIBC__mips32THREAD_H__	37	#ifndef __LIBC__mips32THREAD_H__
32	#define __LIBC__mips32THREAD_H__	38	#define __LIBC__mips32THREAD_H__
33		39
34	/* I did not find any specification (neither MIPS nor PowerPC), but	40	/* I did not find any specification (neither MIPS nor PowerPC), but
35	* as I found it	41	* as I found it
36	* - it uses Variant II	42	* - it uses Variant II
37	* - TCB is at Address(First TLS Block)+0x7000.	43	* - TCB is at Address(First TLS Block)+0x7000.
38	* - DTV is at Address(First TLS Block)+0x8000	44	* - DTV is at Address(First TLS Block)+0x8000
39	* - What would happen if the TLS data was larger then 0x7000?	45	* - What would happen if the TLS data was larger then 0x7000?
40	* - The linker never accesses DTV directly, has the second definition any	46	* - The linker never accesses DTV directly, has the second definition any
41	* sense?	47	* sense?
42	* We will make it this way:	48	* We will make it this way:
43	* - TCB is at TP-0x7000-sizeof(tcb)	49	* - TCB is at TP-0x7000-sizeof(tcb)
44	* - No assumption about DTV etc., but it will not have a fixed address	50	* - No assumption about DTV etc., but it will not have a fixed address
45	*/	51	*/
46	#define MIPS_TP_OFFSET 0x7000	52	#define MIPS_TP_OFFSET 0x7000
47		53
48	typedef struct {	54	typedef struct {
49	void *pst_data;	55	void *pst_data;
50	} tcb_t;	56	} tcb_t;
51		57
52	static inline void __tcb_set(tcb_t *tcb)	58	static inline void __tcb_set(tcb_t *tcb)
53	{	59	{
54	void *tp = tcb;	60	void *tp = tcb;
55	tp += MIPS_TP_OFFSET + sizeof(tcb_t);	61	tp += MIPS_TP_OFFSET + sizeof(tcb_t);
56		62
57	__asm__ volatile ("add $27, %0, $0" : : "r"(tp)); /* Move tls to K1 */	63	__asm__ volatile ("add $27, %0, $0" : : "r"(tp)); /* Move tls to K1 */
58	}	64	}
59		65
60	static inline tcb_t * __tcb_get(void)	66	static inline tcb_t * __tcb_get(void)
61	{	67	{
62	void * retval;	68	void * retval;
63		69
64	__asm__ volatile("add %0, $27, $0" : "=r"(retval));	70	__asm__ volatile("add %0, $27, $0" : "=r"(retval));
65		71
66	return (tcb_t *)(retval - MIPS_TP_OFFSET - sizeof(tcb_t));	72	return (tcb_t *)(retval - MIPS_TP_OFFSET - sizeof(tcb_t));
67	}	73	}
68		74
69	#endif	75	#endif
-		76
-		77	/** @}
-		78	*/
-		79
70		80