[deliverable/linux.git] / arch / sh / include / asm / thread_info.h

#ifndef __ASM_SH_THREAD_INFO_H
#define __ASM_SH_THREAD_INFO_H

/* SuperH version
 * Copyright (C) 2002  Niibe Yutaka
 *
 * The copyright of original i386 version is:
 *
 *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
 *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */
#ifdef __KERNEL__
#include <asm/page.h>

#ifndef __ASSEMBLY__
#include <asm/processor.h>

struct thread_info {
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	unsigned long		flags;		/* low level flags */
	__u32			status;		/* thread synchronous flags */
	__u32			cpu;
	int			preempt_count; /* 0 => preemptable, <0 => BUG */
	mm_segment_t		addr_limit;	/* thread address space */
	struct restart_block	restart_block;
	unsigned long		previous_sp;	/* sp of previous stack in case
						   of nested IRQ stacks */
	__u8			supervisor_stack[0];
};

#endif

#define PREEMPT_ACTIVE		0x10000000

#if defined(CONFIG_4KSTACKS)
#define THREAD_SHIFT	12
#else
#define THREAD_SHIFT	13
#endif

#define THREAD_SIZE	(1 << THREAD_SHIFT)
#define STACK_WARN	(THREAD_SIZE >> 3)

/*
 * macros/functions for gaining access to the thread information structure
 */
#ifndef __ASSEMBLY__
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.status		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
	.addr_limit	= KERNEL_DS,		\
	.restart_block	= {			\
		.fn = do_no_restart_syscall,	\
	},					\
}

#define init_thread_info	(init_thread_union.thread_info)
#define init_stack		(init_thread_union.stack)

/* how to get the current stack pointer from C */
register unsigned long current_stack_pointer asm("r15") __used;

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	struct thread_info *ti;
#if defined(CONFIG_SUPERH64)
	__asm__ __volatile__ ("getcon	cr17, %0" : "=r" (ti));
#elif defined(CONFIG_CPU_HAS_SR_RB)
	__asm__ __volatile__ ("stc	r7_bank, %0" : "=r" (ti));
#else
	unsigned long __dummy;

	__asm__ __volatile__ (
		"mov	r15, %0\n\t"
		"and	%1, %0\n\t"
		: "=&r" (ti), "=r" (__dummy)
		: "1" (~(THREAD_SIZE - 1))
		: "memory");
#endif

	return ti;
}

/* thread information allocation */
#if THREAD_SHIFT >= PAGE_SHIFT

#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)

#endif

extern struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node);
extern void free_thread_info(struct thread_info *ti);
extern void arch_task_cache_init(void);
#define arch_task_cache_init arch_task_cache_init
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
extern void init_thread_xstate(void);

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

#endif /* __ASSEMBLY__ */

/*
 * thread information flags
 * - these are process state flags that various assembly files may need to access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
#define TIF_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_SINGLESTEP		4	/* singlestepping active */
#define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
#define TIF_SECCOMP		6	/* secure computing */
#define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
#define TIF_SYSCALL_TRACEPOINT	8	/* for ftrace syscall instrumentation */
#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE		18	/* is terminating due to OOM killer */

#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)

/*
 * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or we
 * blow the tst immediate size constraints and need to fix up
 * arch/sh/kernel/entry-common.S.
 */

/* work to do in syscall trace */
#define _TIF_WORK_SYSCALL_MASK	(_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
				 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP    | \
				 _TIF_SYSCALL_TRACEPOINT)

/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK	(_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
				 _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
				 _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
				 _TIF_SYSCALL_TRACEPOINT)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK		(_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
				 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))

/*
 * Thread-synchronous status.
 *
 * This is different from the flags in that nobody else
 * ever touches our thread-synchronous status, so we don't
 * have to worry about atomic accesses.
 */
#define TS_RESTORE_SIGMASK	0x0001	/* restore signal mask in do_signal() */
#define TS_USEDFPU		0x0002	/* FPU used by this task this quantum */

#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK	1
static inline void set_restore_sigmask(void)
{
	struct thread_info *ti = current_thread_info();
	ti->status |= TS_RESTORE_SIGMASK;
	set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
}
#endif	/* !__ASSEMBLY__ */

#endif /* __KERNEL__ */

#endif /* __ASM_SH_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __ASM_SH_THREAD_INFO_H
	2	#define __ASM_SH_THREAD_INFO_H
	3
	4	/* SuperH version
	5	* Copyright (C) 2002 Niibe Yutaka
	6	*
	7	* The copyright of original i386 version is:
	8	*
	9	* Copyright (C) 2002 David Howells (dhowells@redhat.com)
	10	* - Incorporating suggestions made by Linus Torvalds and Dave Miller
	11	*/
1da177e4	12	#ifdef __KERNEL__
a6a31139	13	#include <asm/page.h>
1da177e4 LT	14
	15	#ifndef __ASSEMBLY__
	16	#include <asm/processor.h>
	17
	18	struct thread_info {
	19	struct task_struct task; / main task structure */
	20	struct exec_domain exec_domain; / execution domain */
6ecf66ae	21	unsigned long flags; /* low level flags */
56bfc42f	22	__u32 status; /* thread synchronous flags */
1da177e4	23	__u32 cpu;
dcd497f9	24	int preempt_count; /* 0 => preemptable, <0 => BUG */
2991be72	25	mm_segment_t addr_limit; /* thread address space */
1da177e4	26	struct restart_block restart_block;
a6a31139 PM	27	unsigned long previous_sp; /* sp of previous stack in case
a6a31139 PM	28	of nested IRQ stacks */
1da177e4 LT	29	__u8 supervisor_stack[0];
	30	};
	31
	32	#endif
	33
37053cc8	34	#define PREEMPT_ACTIVE 0x10000000
a6a31139	35
7a847f81	36	#if defined(CONFIG_4KSTACKS)
c15c5f8c	37	#define THREAD_SHIFT 12
a6a31139	38	#else
c15c5f8c	39	#define THREAD_SHIFT 13
a6a31139	40	#endif
7a847f81	41
c15c5f8c	42	#define THREAD_SIZE (1 << THREAD_SHIFT)
7a847f81	43	#define STACK_WARN (THREAD_SIZE >> 3)
1da177e4 LT	44
	45	/*
	46	* macros/functions for gaining access to the thread information structure
	47	*/
	48	#ifndef __ASSEMBLY__
	49	#define INIT_THREAD_INFO(tsk) \
	50	{ \
	51	.task = &tsk, \
	52	.exec_domain = &default_exec_domain, \
	53	.flags = 0, \
d3ea9fa0	54	.status = 0, \
1da177e4	55	.cpu = 0, \
c99e6efe	56	.preempt_count = INIT_PREEMPT_COUNT, \
2991be72	57	.addr_limit = KERNEL_DS, \
1da177e4 LT	58	.restart_block = { \
	59	.fn = do_no_restart_syscall, \
	60	}, \
	61	}
	62
	63	#define init_thread_info (init_thread_union.thread_info)
	64	#define init_stack (init_thread_union.stack)
	65
a6a31139	66	/* how to get the current stack pointer from C */
3ff6eecc	67	register unsigned long current_stack_pointer asm("r15") __used;
a6a31139	68
1da177e4 LT	69	/* how to get the thread information struct from C */
	70	static inline struct thread_info *current_thread_info(void)
	71	{
	72	struct thread_info *ti;
114f1329 PM	73	#if defined(CONFIG_SUPERH64)
	74	__asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
	75	#elif defined(CONFIG_CPU_HAS_SR_RB)
	76	__asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
f1517494 PM	77	#else
	78	unsigned long __dummy;
	79
	80	__asm__ __volatile__ (
	81	"mov r15, %0\n\t"
	82	"and %1, %0\n\t"
	83	: "=&r" (ti), "=r" (__dummy)
	84	: "1" (~(THREAD_SIZE - 1))
	85	: "memory");
	86	#endif
	87
1da177e4 LT	88	return ti;
	89	}
	90
c15c5f8c PM	91	/* thread information allocation */
	92	#if THREAD_SHIFT >= PAGE_SHIFT
	93
	94	#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
	95
cbf6b1ba	96	#endif
b69c49b7	97
b6a84016	98	extern struct thread_info alloc_thread_info_node(struct task_struct tsk, int node);
c15c5f8c	99	extern void free_thread_info(struct thread_info *ti);
0ea820cf PM	100	extern void arch_task_cache_init(void);
	101	#define arch_task_cache_init arch_task_cache_init
	102	extern int arch_dup_task_struct(struct task_struct dst, struct task_struct src);
	103	extern void init_thread_xstate(void);
c652d780	104
cbf6b1ba	105	#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
1da177e4	106
510c72ad	107	#endif /* __ASSEMBLY__ */
1da177e4 LT	108
	109	/*
	110	* thread information flags
	111	* - these are process state flags that various assembly files may need to access
	112	* - pending work-to-be-done flags are in LSW
	113	* - other flags in MSW
	114	*/
	115	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	116	#define TIF_SIGPENDING 1 /* signal pending */
a583f1b5 SE	117	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
a583f1b5	118	#define TIF_SINGLESTEP 4 /* singlestepping active */
c4637d47 PM	119	#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
c4637d47 PM	120	#define TIF_SECCOMP 6 /* secure computing */
ab99c733	121	#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
a74f7e04	122	#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
1da177e4	123	#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
0ddc9324	124	#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
1da177e4	125
cec3fd3e PM	126	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
	127	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	128	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
cec3fd3e PM	129	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
cec3fd3e PM	130	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
c4637d47	131	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
ab99c733	132	#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
a74f7e04	133	#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
cec3fd3e	134	#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
cec3fd3e PM	135
cec3fd3e PM	136	/*
c652d780	137	* _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or we
cec3fd3e PM	138	* blow the tst immediate size constraints and need to fix up
	139	* arch/sh/kernel/entry-common.S.
	140	*/
	141
	142	/* work to do in syscall trace */
	143	#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE \| _TIF_SINGLESTEP \| \
c652d780	144	_TIF_SYSCALL_AUDIT \| _TIF_SECCOMP \| \
a74f7e04	145	_TIF_SYSCALL_TRACEPOINT)
cec3fd3e PM	146
cec3fd3e PM	147	/* work to do on any return to u-space */
ab99c733 PM	148	#define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE \| _TIF_SIGPENDING \| \
ab99c733 PM	149	_TIF_NEED_RESCHED \| _TIF_SYSCALL_AUDIT \| \
56bfc42f PM	150	_TIF_SINGLESTEP \| _TIF_NOTIFY_RESUME \| \
56bfc42f PM	151	_TIF_SYSCALL_TRACEPOINT)
cec3fd3e PM	152
	153	/* work to do on interrupt/exception return */
	154	#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE \| \
	155	_TIF_SYSCALL_AUDIT \| _TIF_SINGLESTEP))
1da177e4	156
56bfc42f PM	157	/*
	158	* Thread-synchronous status.
	159	*
	160	* This is different from the flags in that nobody else
	161	* ever touches our thread-synchronous status, so we don't
	162	* have to worry about atomic accesses.
	163	*/
	164	#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
d3ea9fa0	165	#define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */
56bfc42f PM	166
	167	#ifndef __ASSEMBLY__
	168	#define HAVE_SET_RESTORE_SIGMASK 1
	169	static inline void set_restore_sigmask(void)
	170	{
	171	struct thread_info *ti = current_thread_info();
	172	ti->status \|= TS_RESTORE_SIGMASK;
	173	set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
	174	}
	175	#endif /* !__ASSEMBLY__ */
	176
1da177e4 LT	177	#endif /* __KERNEL__ */
	178
	179	#endif /* __ASM_SH_THREAD_INFO_H */