thread_info.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_M68K_THREAD_INFO_H
 3#define _ASM_M68K_THREAD_INFO_H
 4
 5#include <asm/types.h>
 6#include <asm/page.h>
 7
 8/*
 9 * On machines with 4k pages we default to an 8k thread size, though we
10 * allow a 4k with config option. Any other machine page size then
11 * the thread size must match the page size (which is 8k and larger here).
12 */
13#if PAGE_SHIFT < 13
14#ifdef CONFIG_4KSTACKS
15#define THREAD_SIZE_ORDER	0
16#else
17#define THREAD_SIZE_ORDER	1
18#endif
19#else
20#define THREAD_SIZE_ORDER	0
21#endif
22
23#define THREAD_SIZE	(PAGE_SIZE << THREAD_SIZE_ORDER)
24
25#ifndef __ASSEMBLER__
26
27struct thread_info {
28	struct task_struct	*task;		/* main task structure */
29	unsigned long		flags;
30	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
31	__u32			cpu;		/* should always be 0 on m68k */
32	unsigned long		tp_value;	/* thread pointer */
33};
34#endif /* __ASSEMBLER__ */
35
36#define INIT_THREAD_INFO(tsk)			\
37{						\
38	.task		= &tsk,			\
39	.preempt_count	= INIT_PREEMPT_COUNT,	\
40}
41
42#ifndef __ASSEMBLER__
43/* how to get the thread information struct from C */
44static inline struct thread_info *current_thread_info(void)
45{
46	struct thread_info *ti;
47	__asm__(
48		"move.l %%sp, %0 \n\t"
49		"and.l  %1, %0"
50		: "=&d"(ti)
51		: "di" (~(THREAD_SIZE-1))
52		);
53	return ti;
54}
55#endif
56
57/* entry.S relies on these definitions!
58 * bits 0-7 are tested at every exception exit
59 * bits 8-15 are also tested at syscall exit
60 */
61#define TIF_NOTIFY_SIGNAL	4
62#define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
63#define TIF_SIGPENDING		6	/* signal pending */
64#define TIF_NEED_RESCHED	7	/* rescheduling necessary */
65#define TIF_SECCOMP		13	/* seccomp syscall filtering active */
66#define TIF_DELAYED_TRACE	14	/* single step a syscall */
67#define TIF_SYSCALL_TRACE	15	/* syscall trace active */
68#define TIF_MEMDIE		16	/* is terminating due to OOM killer */
69#define TIF_RESTORE_SIGMASK	18	/* restore signal mask in do_signal */
70
71#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
72#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
73#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
74#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
75#define _TIF_DELAYED_TRACE	(1 << TIF_DELAYED_TRACE)
76#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
77#define _TIF_MEMDIE		(1 << TIF_MEMDIE)
78#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
79
80#endif	/* _ASM_M68K_THREAD_INFO_H */