[thirdparty/kernel/linux.git] / arch / metag / include / asm / thread_info.h

/* SPDX-License-Identifier: GPL-2.0 */
/* thread_info.h: Meta low-level thread information
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 *
 * Meta port by Imagination Technologies
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#include <linux/compiler.h>
#include <asm/page.h>

#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__

/* This must be 8 byte aligned so we can ensure stack alignment. */
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 */

	u8 supervisor_stack[0] __aligned(8);
};

#else /* !__ASSEMBLY__ */

#include <generated/asm-offsets.h>

#endif

#ifdef CONFIG_4KSTACKS
#define THREAD_SHIFT		12
#else
#define THREAD_SHIFT		13
#endif

#if THREAD_SHIFT >= PAGE_SHIFT
#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)
#else
#define THREAD_SIZE_ORDER	0
#endif

#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)

#define STACK_WARN		(THREAD_SIZE/8)
/*
 * 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 current stack pointer from C */
register unsigned long current_stack_pointer asm("A0StP") __used;

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	return (struct thread_info *)(current_stack_pointer &
				      ~(THREAD_SIZE - 1));
}

#define __HAVE_ARCH_KSTACK_END
static inline int kstack_end(void *addr)
{
	return addr == (void *) (((unsigned long) addr & ~(THREAD_SIZE - 1))
				 + sizeof(struct thread_info));
}

#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_SYSCALL_AUDIT	4	/* syscall auditing active */
#define TIF_SECCOMP		5	/* secure computing */
#define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
#define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
#define TIF_MEMDIE		8	/* is terminating due to OOM killer */
#define TIF_SYSCALL_TRACEPOINT	9	/* syscall tracepoint instrumentation */


#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_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)

/* 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_RESTORE_SIGMASK | \
				 _TIF_NOTIFY_RESUME)

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

#endif /* _ASM_THREAD_INFO_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
44dea393 JH	2	/* thread_info.h: Meta low-level thread information
	3	*
	4	* Copyright (C) 2002 David Howells (dhowells@redhat.com)
	5	* - Incorporating suggestions made by Linus Torvalds and Dave Miller
	6	*
	7	* Meta port by Imagination Technologies
	8	*/
	9
	10	#ifndef _ASM_THREAD_INFO_H
	11	#define _ASM_THREAD_INFO_H
	12
	13	#include <linux/compiler.h>
	14	#include <asm/page.h>
	15
	16	#ifndef __ASSEMBLY__
	17	#include <asm/processor.h>
	18	#endif
	19
	20	/*
	21	* low level task data that entry.S needs immediate access to
	22	* - this struct should fit entirely inside of one cache line
	23	* - this struct shares the supervisor stack pages
	24	* - if the contents of this structure are changed, the assembly constants must
	25	* also be changed
	26	*/
	27	#ifndef __ASSEMBLY__
	28
	29	/* This must be 8 byte aligned so we can ensure stack alignment. */
	30	struct thread_info {
	31	struct task_struct task; / main task structure */
44dea393 JH	32	unsigned long flags; /* low level flags */
	33	unsigned long status; /* thread-synchronous flags */
	34	u32 cpu; /* current CPU */
	35	int preempt_count; /* 0 => preemptable, <0 => BUG */
	36
	37	mm_segment_t addr_limit; /* thread address space */
44dea393	38
f56141e3	39	u8 supervisor_stack[0] __aligned(8);
44dea393 JH	40	};
	41
	42	#else /* !__ASSEMBLY__ */
	43
	44	#include <generated/asm-offsets.h>
	45
	46	#endif
	47
44dea393 JH	48	#ifdef CONFIG_4KSTACKS
	49	#define THREAD_SHIFT 12
	50	#else
	51	#define THREAD_SHIFT 13
	52	#endif
	53
	54	#if THREAD_SHIFT >= PAGE_SHIFT
	55	#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
	56	#else
	57	#define THREAD_SIZE_ORDER 0
	58	#endif
	59
	60	#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
	61
	62	#define STACK_WARN (THREAD_SIZE/8)
	63	/*
	64	* macros/functions for gaining access to the thread information structure
	65	*/
	66	#ifndef __ASSEMBLY__
	67
	68	#define INIT_THREAD_INFO(tsk) \
	69	{ \
	70	.task = &tsk, \
44dea393 JH	71	.flags = 0, \
	72	.cpu = 0, \
	73	.preempt_count = INIT_PREEMPT_COUNT, \
	74	.addr_limit = KERNEL_DS, \
44dea393 JH	75	}
	76
	77	#define init_thread_info (init_thread_union.thread_info)
	78	#define init_stack (init_thread_union.stack)
	79
	80	/* how to get the current stack pointer from C */
	81	register unsigned long current_stack_pointer asm("A0StP") __used;
	82
	83	/* how to get the thread information struct from C */
	84	static inline struct thread_info *current_thread_info(void)
	85	{
	86	return (struct thread_info *)(current_stack_pointer &
	87	~(THREAD_SIZE - 1));
	88	}
	89
	90	#define __HAVE_ARCH_KSTACK_END
	91	static inline int kstack_end(void *addr)
	92	{
	93	return addr == (void *) (((unsigned long) addr & ~(THREAD_SIZE - 1))
	94	+ sizeof(struct thread_info));
	95	}
	96
	97	#endif
	98
	99	/*
	100	* thread information flags
	101	* - these are process state flags that various assembly files may need to
	102	* access
	103	* - pending work-to-be-done flags are in LSW
	104	* - other flags in MSW
	105	*/
	106	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
	107	#define TIF_SIGPENDING 1 /* signal pending */
	108	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	109	#define TIF_SINGLESTEP 3 /* restore singlestep on return to user
	110	mode */
	111	#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
	112	#define TIF_SECCOMP 5 /* secure computing */
	113	#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
	114	#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
31e6cdef JH	115	#define TIF_MEMDIE 8 /* is terminating due to OOM killer */
31e6cdef JH	116	#define TIF_SYSCALL_TRACEPOINT 9 /* syscall tracepoint instrumentation */
44dea393 JH	117
	118
	119	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
	120	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	121	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	122	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	123	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	124	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
	125	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
	126	#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
	127	#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
	128
	129	/* work to do in syscall trace */
	130	#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE \| _TIF_SINGLESTEP \| \
	131	_TIF_SYSCALL_AUDIT \| _TIF_SECCOMP \| \
	132	_TIF_SYSCALL_TRACEPOINT)
	133
	134	/* work to do on any return to u-space */
	135	#define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE \| _TIF_SIGPENDING \| \
	136	_TIF_NEED_RESCHED \| _TIF_SYSCALL_AUDIT \| \
	137	_TIF_SINGLESTEP \| _TIF_RESTORE_SIGMASK \| \
	138	_TIF_NOTIFY_RESUME)
	139
	140	/* work to do on interrupt/exception return */
	141	#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE \| \
	142	_TIF_SYSCALL_AUDIT \| _TIF_SINGLESTEP))
	143
44dea393	144	#endif /* _ASM_THREAD_INFO_H */