Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ALPHA_THREAD_INFO_H
3#define _ALPHA_THREAD_INFO_H
4
5#ifdef __KERNEL__
6
7#ifndef __ASSEMBLY__
8#include <asm/processor.h>
9#include <asm/types.h>
10#include <asm/hwrpb.h>
11#include <asm/sysinfo.h>
12#endif
13
14#ifndef __ASSEMBLY__
15struct thread_info {
16 struct pcb_struct pcb; /* palcode state */
17
18 struct task_struct *task; /* main task structure */
19 unsigned int flags; /* low level flags */
20 unsigned int ieee_state; /* see fpu.h */
21
22 mm_segment_t addr_limit; /* thread address space */
23 unsigned cpu; /* current CPU */
24 int preempt_count; /* 0 => preemptable, <0 => BUG */
25 unsigned int status; /* thread-synchronous flags */
26
27 int bpt_nsaved;
28 unsigned long bpt_addr[2]; /* breakpoint handling */
29 unsigned int bpt_insn[2];
30};
31
32/*
33 * Macros/functions for gaining access to the thread information structure.
34 */
35#define INIT_THREAD_INFO(tsk) \
36{ \
37 .task = &tsk, \
38 .addr_limit = KERNEL_DS, \
39 .preempt_count = INIT_PREEMPT_COUNT, \
40}
41
42/* How to get the thread information struct from C. */
43register struct thread_info *__current_thread_info __asm__("$8");
44#define current_thread_info() __current_thread_info
45
46#endif /* __ASSEMBLY__ */
47
48/* Thread information allocation. */
49#define THREAD_SIZE_ORDER 1
50#define THREAD_SIZE (2*PAGE_SIZE)
51
52/*
53 * Thread information flags:
54 * - these are process state flags and used from assembly
55 * - pending work-to-be-done flags come first and must be assigned to be
56 * within bits 0 to 7 to fit in and immediate operand.
57 *
58 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
59 */
60#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
61#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
62#define TIF_SIGPENDING 2 /* signal pending */
63#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
64#define TIF_SYSCALL_AUDIT 4 /* syscall audit active */
65#define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */
66#define TIF_MEMDIE 13 /* is terminating due to OOM killer */
67#define TIF_POLLING_NRFLAG 14 /* idle is polling for TIF_NEED_RESCHED */
68
69#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
70#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
71#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
72#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
73#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
74#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
75
76/* Work to do on interrupt/exception return. */
77#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
78 _TIF_NOTIFY_RESUME)
79
80/* Work to do on any return to userspace. */
81#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
82 | _TIF_SYSCALL_TRACE)
83
84#define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */
85#define TS_UAC_NOFIX 0x0002 /* ! flags as they match */
86#define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */
87
88#define SET_UNALIGN_CTL(task,value) ({ \
89 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \
90 if (value & PR_UNALIGN_NOPRINT) \
91 status |= TS_UAC_NOPRINT; \
92 if (value & PR_UNALIGN_SIGBUS) \
93 status |= TS_UAC_SIGBUS; \
94 if (value & 4) /* alpha-specific */ \
95 status |= TS_UAC_NOFIX; \
96 task_thread_info(task)->status = status; \
97 0; })
98
99#define GET_UNALIGN_CTL(task,value) ({ \
100 __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \
101 __u32 res = 0; \
102 if (status & TS_UAC_NOPRINT) \
103 res |= PR_UNALIGN_NOPRINT; \
104 if (status & TS_UAC_SIGBUS) \
105 res |= PR_UNALIGN_SIGBUS; \
106 if (status & TS_UAC_NOFIX) \
107 res |= 4; \
108 put_user(res, (int __user *)(value)); \
109 })
110
111#endif /* __KERNEL__ */
112#endif /* _ALPHA_THREAD_INFO_H */