[mirror_ubuntu-bionic-kernel.git] / arch / m32r / include / asm / thread_info.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_M32R_THREAD_INFO_H
#define _ASM_M32R_THREAD_INFO_H

/* thread_info.h: m32r low-level thread information
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 * Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
 */

#ifdef __KERNEL__

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

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants must also be changed
 */
#ifndef __ASSEMBLY__

struct thread_info {
	struct task_struct	*task;		/* main task structure */
	unsigned long		flags;		/* low level flags */
	unsigned long		status;		/* thread-synchronous flags */
	__u32			cpu;		/* current CPU */
	int			preempt_count;	/* 0 => preemptable, <0 => BUG */

	mm_segment_t		addr_limit;	/* thread address space:
					 	   0-0xBFFFFFFF for user-thread
						   0-0xFFFFFFFF for kernel-thread
						*/

	__u8			supervisor_stack[0];
};

#endif /* !__ASSEMBLY__ */

#define THREAD_SIZE		(PAGE_SIZE << 1)
#define THREAD_SIZE_ORDER	1
/*
 * macros/functions for gaining access to the thread information structure
 */
#ifndef __ASSEMBLY__

#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
	.addr_limit	= KERNEL_DS,		\
}

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

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	struct thread_info *ti;

	__asm__ __volatile__ (
		"ldi	%0, #%1			\n\t"
		"and	%0, sp			\n\t"
		: "=r" (ti) : "i" (~(THREAD_SIZE - 1))
	);

	return ti;
}

#define TI_FLAG_FAULT_CODE_SHIFT	28

static inline void set_thread_fault_code(unsigned int val)
{
	struct thread_info *ti = current_thread_info();
	ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
		| (val << TI_FLAG_FAULT_CODE_SHIFT);
}

static inline unsigned int get_thread_fault_code(void)
{
	struct thread_info *ti = current_thread_info();
	return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
}

#endif

/*
 * 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		3	/* restore singlestep on return to user mode */
#define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
#define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
#define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
#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_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_USEDFPU		(1<<TIF_USEDFPU)

#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)

/*
 * 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_USEDFPU		0x0001	/* FPU was used by this task this quantum (SMP) */

#endif /* __KERNEL__ */

#endif /* _ASM_M32R_THREAD_INFO_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _ASM_M32R_THREAD_INFO_H
	3	#define _ASM_M32R_THREAD_INFO_H
	4
	5	/* thread_info.h: m32r low-level thread information
	6	*
	7	* Copyright (C) 2002 David Howells (dhowells@redhat.com)
	8	* - Incorporating suggestions made by Linus Torvalds and Dave Miller
	9	* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
	10	*/
	11
	12	#ifdef __KERNEL__
	13
	14	#ifndef __ASSEMBLY__
	15	#include <asm/processor.h>
	16	#endif
	17
	18	/*
	19	* low level task data that entry.S needs immediate access to
	20	* - this struct should fit entirely inside of one cache line
	21	* - this struct shares the supervisor stack pages
	22	* - if the contents of this structure are changed, the assembly constants must also be changed
	23	*/
	24	#ifndef __ASSEMBLY__
	25
	26	struct thread_info {
	27	struct task_struct task; / main task structure */
1da177e4 LT	28	unsigned long flags; /* low level flags */
	29	unsigned long status; /* thread-synchronous flags */
	30	__u32 cpu; /* current CPU */
dcd497f9	31	int preempt_count; /* 0 => preemptable, <0 => BUG */
1da177e4 LT	32
	33	mm_segment_t addr_limit; /* thread address space:
	34	0-0xBFFFFFFF for user-thread
	35	0-0xFFFFFFFF for kernel-thread
	36	*/
1da177e4 LT	37
	38	__u8 supervisor_stack[0];
	39	};
	40
37f078ff	41	#endif /* !__ASSEMBLY__ */
1da177e4	42
e6e9c540 TG	43	#define THREAD_SIZE (PAGE_SIZE << 1)
e6e9c540 TG	44	#define THREAD_SIZE_ORDER 1
1da177e4 LT	45	/*
1da177e4 LT	46	* macros/functions for gaining access to the thread information structure
1da177e4 LT	47	*/
	48	#ifndef __ASSEMBLY__
	49
	50	#define INIT_THREAD_INFO(tsk) \
	51	{ \
	52	.task = &tsk, \
1da177e4 LT	53	.flags = 0, \
1da177e4 LT	54	.cpu = 0, \
c99e6efe	55	.preempt_count = INIT_PREEMPT_COUNT, \
1da177e4	56	.addr_limit = KERNEL_DS, \
1da177e4 LT	57	}
	58
	59	#define init_thread_info (init_thread_union.thread_info)
	60	#define init_stack (init_thread_union.stack)
	61
1da177e4 LT	62	/* how to get the thread information struct from C */
	63	static inline struct thread_info *current_thread_info(void)
	64	{
	65	struct thread_info *ti;
	66
	67	__asm__ __volatile__ (
	68	"ldi %0, #%1 \n\t"
	69	"and %0, sp \n\t"
	70	: "=r" (ti) : "i" (~(THREAD_SIZE - 1))
	71	);
	72
	73	return ti;
	74	}
	75
1da177e4 LT	76	#define TI_FLAG_FAULT_CODE_SHIFT 28
	77
	78	static inline void set_thread_fault_code(unsigned int val)
	79	{
	80	struct thread_info *ti = current_thread_info();
	81	ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
	82	\| (val << TI_FLAG_FAULT_CODE_SHIFT);
	83	}
	84
	85	static inline unsigned int get_thread_fault_code(void)
	86	{
	87	struct thread_info *ti = current_thread_info();
	88	return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
	89	}
	90
1da177e4 LT	91	#endif
	92
	93	/*
	94	* thread information flags
	95	* - these are process state flags that various assembly files may need to access
	96	* - pending work-to-be-done flags are in LSW
	97	* - other flags in MSW
	98	*/
	99	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	100	#define TIF_SIGPENDING 1 /* signal pending */
	101	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	102	#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
d0420c83	103	#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
c37a3303 HT	104	#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
c37a3303 HT	105	#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
0ddc9324	106	#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
1da177e4 LT	107
1da177e4 LT	108	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1da177e4 LT	109	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	110	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	111	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
d0420c83	112	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
c37a3303	113	#define _TIF_USEDFPU (1<<TIF_USEDFPU)
1da177e4	114
d70745bb AV	115	#define _TIF_WORK_MASK (_TIF_SIGPENDING \| _TIF_NEED_RESCHED \| _TIF_NOTIFY_RESUME)
d70745bb AV	116	#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \| _TIF_SYSCALL_TRACE)
1da177e4 LT	117
	118	/*
	119	* Thread-synchronous status.
	120	*
	121	* This is different from the flags in that nobody else
	122	* ever touches our thread-synchronous status, so we don't
	123	* have to worry about atomic accesses.
	124	*/
	125	#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
	126
	127	#endif /* __KERNEL__ */
	128
	129	#endif /* _ASM_M32R_THREAD_INFO_H */