1/* SPDX-License-Identifier: GPL-2.0 */
  2/* thread_info.h: h8300 low-level thread information
  3 * adapted from the i386 and PPC versions by Yoshinori Sato <ysato@users.sourceforge.jp>
  4 *
  5 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
  6 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
  7 */
  8
  9#ifndef _ASM_THREAD_INFO_H
 10#define _ASM_THREAD_INFO_H
 11
 12#include <asm/page.h>
 13#include <asm/segment.h>
 14
 15#ifdef __KERNEL__
 16
 17/*
 18 * Size of kernel stack for each process. This must be a power of 2...
 19 */
 20#define THREAD_SIZE_ORDER	1
 21#define THREAD_SIZE		8192	/* 2 pages */
 22
 23#ifndef __ASSEMBLY__
 24
 25/*
 26 * low level task data.
 27 * If you change this, change the TI_* offsets below to match.
 28 */
 29struct thread_info {
 30	struct task_struct *task;		/* main task structure */
 31	unsigned long	   flags;		/* low level flags */
 32	int		   cpu;			/* cpu we're on */
 33	int		   preempt_count;	/* 0 => preemptable, <0 => BUG */
 34	mm_segment_t		addr_limit;
 35};
 36
 37/*
 38 * macros/functions for gaining access to the thread information structure
 39 */
 40#define INIT_THREAD_INFO(tsk)			\
 41{						\
 42	.task =		&tsk,			\
 43	.flags =	0,			\
 44	.cpu =		0,			\
 45	.preempt_count = INIT_PREEMPT_COUNT,	\
 46	.addr_limit	= KERNEL_DS,		\
 47}
 48
 49/* how to get the thread information struct from C */
 50static inline struct thread_info *current_thread_info(void)
 51{
 52	struct thread_info *ti;
 53
 54	__asm__("mov.l	sp, %0\n\t"
 55		"and.w	%1, %T0"
 56		: "=&r"(ti)
 57		: "i" (~(THREAD_SIZE-1) & 0xffff));
 58	return ti;
 59}
 60
 61#endif /* __ASSEMBLY__ */
 62
 63/*
 64 * thread information flag bit numbers
 65 */
 66#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
 67#define TIF_SIGPENDING		1	/* signal pending */
 68#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
 69#define TIF_SINGLESTEP		3	/* singlestepping active */
 70#define TIF_MEMDIE		4	/* is terminating due to OOM killer */
 71#define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
 72#define TIF_NOTIFY_RESUME	6	/* callback before returning to user */
 73#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
 74#define TIF_SYSCALL_TRACEPOINT	8	/* for ftrace syscall instrumentation */
 75#define TIF_POLLING_NRFLAG	9	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 76
 77/* as above, but as bit values */
 78#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 79#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 80#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 81#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 82#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
 83#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 84#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
 85#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 86
 87/* work to do in syscall trace */
 88#define _TIF_WORK_SYSCALL_MASK	(_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 89				 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
 90
 91/* work to do on any return to u-space */
 92#define _TIF_ALLWORK_MASK	(_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
 93				 _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
 94				 _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
 95				 _TIF_SYSCALL_TRACEPOINT)
 96
 97/* work to do on interrupt/exception return */
 98#define _TIF_WORK_MASK		(_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
 99				 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
100
101#endif /* __KERNEL__ */
102
103#endif /* _ASM_THREAD_INFO_H */