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 */
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 */