WebSVN – HelenOS – Diff – /branches/dynload/uspace/lib/libc/arch/arm32/include/tls.h


/*
 * Copyright (c) 2007 Pavel Jancik
 * Copyright (c) 2007 Michal Kebrt
 * 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 libcarm32
 * @{
 */
/** @file
 */
 
#ifndef LIBC_arm32_TLS_H_
#define LIBC_arm32_TLS_H_
 
#include <sys/types.h>
 
#define CONFIG_TLS_VARIANT_1
 
/** Offsets for accessing thread-local variables are shifted 8 bytes higher. */
#define ARM_TP_OFFSET  (-8)
 
/** TCB (Thread Control Block) struct.
 *
 *  TLS starts just after this struct.
 */
typedef struct {
    /** Fibril data. */
    void *fibril_data;
} tcb_t;
 
 
/** Sets TLS address to the r9 register.
 *
 *  @param tcb      TCB (TLS starts behind)
 */
static inline void __tcb_set(tcb_t *tcb)
{
    void *tls = (void *) tcb;
    tls += sizeof(tcb_t) + ARM_TP_OFFSET;
    asm volatile (
        "mov r9, %0"
        :
        : "r" (tls)
    );
}
 
 
/** Returns TCB address.
 *
 * @return      TCB address (starts before TLS which address is stored
 *          in r9 register).
 */
static inline tcb_t *__tcb_get(void)
{
    void *ret;
    asm volatile (
        "mov %0, r9"
        : "=r"(ret)
    );
    return (tcb_t *) (ret - ARM_TP_OFFSET - sizeof(tcb_t));
}
 
 
/** Returns TLS address stored.
 *
 *  Implemented in assembly.
 *
 *  @return     TLS address stored in r9 register
 */
extern uintptr_t __aeabi_read_tp(void);
 
#endif
 
/** @}
 */
 

Rev 2927	Rev 4691
1	/*	1	/*
2	* Copyright (c) 2007 Pavel Jancik	2	* Copyright (c) 2007 Pavel Jancik
3	* Copyright (c) 2007 Michal Kebrt	3	* Copyright (c) 2007 Michal Kebrt
4	* All rights reserved.	4	* All rights reserved.
5	*	5	*
6	* Redistribution and use in source and binary forms, with or without	6	* Redistribution and use in source and binary forms, with or without
7	* modification, are permitted provided that the following conditions	7	* modification, are permitted provided that the following conditions
8	* are met:	8	* are met:
9	*	9	*
10	* - Redistributions of source code must retain the above copyright	10	* - Redistributions of source code must retain the above copyright
11	* notice, this list of conditions and the following disclaimer.	11	* notice, this list of conditions and the following disclaimer.
12	* - Redistributions in binary form must reproduce the above copyright	12	* - Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the	13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the distribution.	14	* documentation and/or other materials provided with the distribution.
15	* - The name of the author may not be used to endorse or promote products	15	* - The name of the author may not be used to endorse or promote products
16	* derived from this software without specific prior written permission.	16	* derived from this software without specific prior written permission.
17	*	17	*
18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/	28	*/
29		29
30	/** @addtogroup libcarm32	30	/** @addtogroup libcarm32
31	* @{	31	* @{
32	*/	32	*/
33	/** @file	33	/** @file
34	*/	34	*/
35		35
36	#ifndef LIBC_arm32_TLS_H_	36	#ifndef LIBC_arm32_TLS_H_
37	#define LIBC_arm32_TLS_H_	37	#define LIBC_arm32_TLS_H_
38		38
39	#include <sys/types.h>	39	#include <sys/types.h>
40		40
41	#define CONFIG_TLS_VARIANT_1	41	#define CONFIG_TLS_VARIANT_1
42		42
43	/** Offsets for accessing __thread variables are shifted 8 bytes higher. */	43	/** Offsets for accessing thread-local variables are shifted 8 bytes higher. */
44	#define ARM_TP_OFFSET (-8)	44	#define ARM_TP_OFFSET (-8)
45		45
46	/** TCB (Thread Control Block) struct.	46	/** TCB (Thread Control Block) struct.
47	*	47	*
48	* TLS starts just after this struct.	48	* TLS starts just after this struct.
49	*/	49	*/
50	typedef struct {	50	typedef struct {
51	/** Fibril data. */	51	/** Fibril data. */
52	void *fibril_data;	52	void *fibril_data;
53	} tcb_t;	53	} tcb_t;
54		54
55		55
56	/** Sets TLS address to the r9 register.	56	/** Sets TLS address to the r9 register.
57	*	57	*
58	* @param tcb TCB (TLS starts behind)	58	* @param tcb TCB (TLS starts behind)
59	*/	59	*/
60	static inline void __tcb_set(tcb_t *tcb)	60	static inline void __tcb_set(tcb_t *tcb)
61	{	61	{
62	void tls = (void ) tcb;	62	void tls = (void ) tcb;
63	tls += sizeof(tcb_t) + ARM_TP_OFFSET;	63	tls += sizeof(tcb_t) + ARM_TP_OFFSET;
64	asm volatile (	64	asm volatile (
65	"mov r9, %0"	65	"mov r9, %0"
66	:	66	:
67	: "r" (tls)	67	: "r" (tls)
68	);	68	);
69	}	69	}
70		70
71		71
72	/** Returns TCB address.	72	/** Returns TCB address.
73	*	73	*
74	* @return TCB address (starts before TLS which address is stored	74	* @return TCB address (starts before TLS which address is stored
75	* in r9 register).	75	* in r9 register).
76	*/	76	*/
77	static inline tcb_t *__tcb_get(void)	77	static inline tcb_t *__tcb_get(void)
78	{	78	{
79	void *ret;	79	void *ret;
80	asm volatile (	80	asm volatile (
81	"mov %0, r9"	81	"mov %0, r9"
82	: "=r"(ret)	82	: "=r"(ret)
83	);	83	);
84	return (tcb_t *) (ret - ARM_TP_OFFSET - sizeof(tcb_t));	84	return (tcb_t *) (ret - ARM_TP_OFFSET - sizeof(tcb_t));
85	}	85	}
86		86
87		87
88	/** Returns TLS address stored.	88	/** Returns TLS address stored.
89	*	89	*
90	* Implemented in assembly.	90	* Implemented in assembly.
91	*	91	*
92	* @return TLS address stored in r9 register	92	* @return TLS address stored in r9 register
93	*/	93	*/
94	extern uintptr_t __aeabi_read_tp(void);	94	extern uintptr_t __aeabi_read_tp(void);
95		95
96	#endif	96	#endif
97		97
98	/** @}	98	/** @}
99	*/	99	*/
100		100

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(root)/branches/dynload/uspace/lib/libc/arch/arm32/include/tls.h – Rev 2927 → 4691