• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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  */
29 struct 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 */
current_thread_info(void)50 static 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 */
104