Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _ALPHA_THREAD_INFO_H
2#define _ALPHA_THREAD_INFO_H
3
4#ifdef __KERNEL__
5
6#ifndef __ASSEMBLY__
7#include <asm/processor.h>
8#include <asm/types.h>
9#include <asm/hwrpb.h>
10#include <asm/sysinfo.h>
11#endif
12
13#ifndef __ASSEMBLY__
14struct thread_info {
15 struct pcb_struct pcb; /* palcode state */
16
17 struct task_struct *task; /* main task structure */
18 unsigned int flags; /* low level flags */
19 unsigned int ieee_state; /* see fpu.h */
20
21 mm_segment_t addr_limit; /* thread address space */
22 unsigned cpu; /* current CPU */
23 int preempt_count; /* 0 => preemptable, <0 => BUG */
24 unsigned int status; /* thread-synchronous flags */
25
26 int bpt_nsaved;
27 unsigned long bpt_addr[2]; /* breakpoint handling */
28 unsigned int bpt_insn[2];
29};
30
31/*
32 * Macros/functions for gaining access to the thread information structure.
33 */
34#define INIT_THREAD_INFO(tsk) \
35{ \
36 .task = &tsk, \
37 .addr_limit = KERNEL_DS, \
38 .preempt_count = INIT_PREEMPT_COUNT, \
39}
40
41#define init_thread_info (init_thread_union.thread_info)
42#define init_stack (init_thread_union.stack)
43
44/* How to get the thread information struct from C. */
45register struct thread_info *__current_thread_info __asm__("$8");
46#define current_thread_info() __current_thread_info
47
48#endif /* __ASSEMBLY__ */
49
50/* Thread information allocation. */
51#define THREAD_SIZE_ORDER 1
52#define THREAD_SIZE (2*PAGE_SIZE)
53
54/*
55 * Thread information flags:
56 * - these are process state flags and used from assembly
57 * - pending work-to-be-done flags come first and must be assigned to be
58 * within bits 0 to 7 to fit in and immediate operand.
59 *
60 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
61 */
62#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
63#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
64#define TIF_SIGPENDING 2 /* signal pending */
65#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
66#define TIF_SYSCALL_AUDIT 4 /* syscall audit active */
67#define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */
68#define TIF_MEMDIE 13 /* is terminating due to OOM killer */
69#define TIF_POLLING_NRFLAG 14 /* idle is polling for TIF_NEED_RESCHED */
70
71#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
72#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
73#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
74#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
75#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
76#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
77
78/* Work to do on interrupt/exception return. */
79#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
80 _TIF_NOTIFY_RESUME)
81
82/* Work to do on any return to userspace. */
83#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
84 | _TIF_SYSCALL_TRACE)
85
86#define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */
87#define TS_UAC_NOFIX 0x0002 /* ! flags as they match */
88#define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */
89
90#define SET_UNALIGN_CTL(task,value) ({ \
91 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \
92 if (value & PR_UNALIGN_NOPRINT) \
93 status |= TS_UAC_NOPRINT; \
94 if (value & PR_UNALIGN_SIGBUS) \
95 status |= TS_UAC_SIGBUS; \
96 if (value & 4) /* alpha-specific */ \
97 status |= TS_UAC_NOFIX; \
98 task_thread_info(task)->status = status; \
99 0; })
100
101#define GET_UNALIGN_CTL(task,value) ({ \
102 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \
103 __u32 res = 0; \
104 if (status & TS_UAC_NOPRINT) \
105 res |= PR_UNALIGN_NOPRINT; \
106 if (status & TS_UAC_SIGBUS) \
107 res |= PR_UNALIGN_SIGBUS; \
108 if (status & TS_UAC_NOFIX) \
109 res |= 4; \
110 put_user(res, (int __user *)(value)); \
111 })
112
113#endif /* __KERNEL__ */
114#endif /* _ALPHA_THREAD_INFO_H */