WebSVN – HelenOS – Diff – /trunk/uspace/libc/arch/arm32/include/thread.h


/*
 * Copyright (c) 2007 Pavel Jancik, 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
 *  @brief Uspace threads and TLS.
 */
 
#ifndef LIBC_arm32_THREAD_H_
#define LIBC_arm32_THREAD_H_
 
#include <unistd.h>
 
/** Stack initial size. */
#define THREAD_INITIAL_STACK_PAGES_NO 1
 
/** Offsets for accessing __thread variables are shifted 8 bytes higher. */
#define ARM_TP_OFFSET   (-8)
 
/** TCB (Thread Control Block) struct.
 *
 *  TLS starts just after this struct.
 */
typedef struct {
    /** psthread data. */
    void *pst_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 2465	Rev 2468
1	/*	1	/*
2	* Copyright (c) 2007 Pavel Jancik, Michal Kebrt	2	* Copyright (c) 2007 Pavel Jancik, Michal Kebrt
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 libcarm32	29	/** @addtogroup libcarm32
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	* @brief Uspace threads and TLS.	33	* @brief Uspace threads and TLS.
34	*/	34	*/
35		35
36	#ifndef LIBC_arm32_THREAD_H_	36	#ifndef LIBC_arm32_THREAD_H_
37	#define LIBC_arm32_THREAD_H_	37	#define LIBC_arm32_THREAD_H_
38		38
39	#include <unistd.h>	39	#include <unistd.h>
40		40
41	/** Stack initial size. */	41	/** Stack initial size. */
42	#define THREAD_INITIAL_STACK_PAGES_NO 1	42	#define THREAD_INITIAL_STACK_PAGES_NO 1
43		43
44	/** Offsets for accessing __thread variables are shifted 8 bytes higher. */	44	/** Offsets for accessing __thread variables are shifted 8 bytes higher. */
45	#define ARM_TP_OFFSET (-8)	45	#define ARM_TP_OFFSET (-8)
46		46
47	/** TCB (Thread Control Block) struct.	47	/** TCB (Thread Control Block) struct.
48	*	48	*
49	* TLS starts just after this struct.	49	* TLS starts just after this struct.
50	*/	50	*/
51	typedef struct {	51	typedef struct {
52	/** psthread data. */	52	/** psthread data. */
53	void *pst_data;	53	void *pst_data;
54	} tcb_t;	54	} tcb_t;
55		55
56		56
57	/** Sets TLS address to the r9 register.	57	/** Sets TLS address to the r9 register.
58	*	58	*
59	* @param tcb TCB (TLS starts behind)	59	* @param tcb TCB (TLS starts behind)
60	*/	60	*/
61	static inline void __tcb_set(tcb_t *tcb)	61	static inline void __tcb_set(tcb_t *tcb)
62	{	62	{
63	void tls = (void )tcb;	63	void tls = (void ) tcb;
64	tls += sizeof(tcb_t) + ARM_TP_OFFSET;	64	tls += sizeof(tcb_t) + ARM_TP_OFFSET;
65	asm volatile (	65	asm volatile (
66	"mov r9, %0"	66	"mov r9, %0"
67	:	67	:
68	: "r"(tls)	68	: "r"(tls)
69	);	69	);
70	}	70	}
71		71
72		72
73	/** Returns TCB address.	73	/** Returns TCB address.
74	*	74	*
75	* @return TCB address (starts before TLS which address is stored in r9 register).	75	* @return TCB address (starts before TLS which address is stored 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

Subversion Repositories HelenOS

(root)/trunk/uspace/libc/arch/arm32/include/thread.h – Rev 2465 → 2468