Linux kernel mirror (for testing)
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linux
1/*
2 * S390 version
3 * Copyright IBM Corp. 2002, 2006
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
5 */
6
7#ifndef _ASM_THREAD_INFO_H
8#define _ASM_THREAD_INFO_H
9
10/*
11 * Size of kernel stack for each process
12 */
13#ifndef CONFIG_64BIT
14#define THREAD_ORDER 1
15#define ASYNC_ORDER 1
16#else /* CONFIG_64BIT */
17#define THREAD_ORDER 2
18#define ASYNC_ORDER 2
19#endif /* CONFIG_64BIT */
20
21#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
22#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
23
24#ifndef __ASSEMBLY__
25#include <asm/lowcore.h>
26#include <asm/page.h>
27#include <asm/processor.h>
28
29/*
30 * low level task data that entry.S needs immediate access to
31 * - this struct should fit entirely inside of one cache line
32 * - this struct shares the supervisor stack pages
33 * - if the contents of this structure are changed, the assembly constants must also be changed
34 */
35struct thread_info {
36 struct task_struct *task; /* main task structure */
37 struct exec_domain *exec_domain; /* execution domain */
38 unsigned long flags; /* low level flags */
39 unsigned long sys_call_table; /* System call table address */
40 unsigned int cpu; /* current CPU */
41 int preempt_count; /* 0 => preemptable, <0 => BUG */
42 unsigned int system_call;
43 __u64 user_timer;
44 __u64 system_timer;
45 unsigned long last_break; /* last breaking-event-address. */
46};
47
48/*
49 * macros/functions for gaining access to the thread information structure
50 */
51#define INIT_THREAD_INFO(tsk) \
52{ \
53 .task = &tsk, \
54 .exec_domain = &default_exec_domain, \
55 .flags = 0, \
56 .cpu = 0, \
57 .preempt_count = INIT_PREEMPT_COUNT, \
58}
59
60#define init_thread_info (init_thread_union.thread_info)
61#define init_stack (init_thread_union.stack)
62
63/* how to get the thread information struct from C */
64static inline struct thread_info *current_thread_info(void)
65{
66 return (struct thread_info *) S390_lowcore.thread_info;
67}
68
69#define THREAD_SIZE_ORDER THREAD_ORDER
70
71#endif
72
73/*
74 * thread information flags bit numbers
75 */
76#define TIF_NOTIFY_RESUME 0 /* callback before returning to user */
77#define TIF_SIGPENDING 1 /* signal pending */
78#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
79#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
80#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
81#define TIF_SECCOMP 5 /* secure computing */
82#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
83#define TIF_UPROBE 7 /* breakpointed or single-stepping */
84#define TIF_31BIT 16 /* 32bit process */
85#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
86#define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */
87#define TIF_SINGLE_STEP 19 /* This task is single stepped */
88#define TIF_BLOCK_STEP 20 /* This task is block stepped */
89#define TIF_UPROBE_SINGLESTEP 21 /* This task is uprobe single stepped */
90
91#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
92#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
93#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
94#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
95#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
96#define _TIF_SECCOMP (1<<TIF_SECCOMP)
97#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
98#define _TIF_UPROBE (1<<TIF_UPROBE)
99#define _TIF_31BIT (1<<TIF_31BIT)
100#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
101
102#ifdef CONFIG_64BIT
103#define is_32bit_task() (test_thread_flag(TIF_31BIT))
104#else
105#define is_32bit_task() (1)
106#endif
107
108#endif /* _ASM_THREAD_INFO_H */