Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 __ASSEMBLER__
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 __ASSEMBLER__
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 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 unsigned long fp[32];
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 .preempt_count = INIT_PREEMPT_COUNT, \
39}
40
41/* How to get the thread information struct from C. */
42register struct thread_info *__current_thread_info __asm__("$8");
43#define current_thread_info() __current_thread_info
44
45register unsigned long *current_stack_pointer __asm__ ("$30");
46
47#endif /* __ASSEMBLER__ */
48
49/* Thread information allocation. */
50#define THREAD_SIZE_ORDER 1
51#define THREAD_SIZE (2*PAGE_SIZE)
52
53/*
54 * Thread information flags:
55 * - these are process state flags and used from assembly
56 * - pending work-to-be-done flags come first and must be assigned to be
57 * within bits 0 to 7 to fit in and immediate operand.
58 *
59 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
60 */
61#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
62#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
63#define TIF_SIGPENDING 2 /* signal pending */
64#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
65#define TIF_SYSCALL_AUDIT 4 /* syscall audit active */
66#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
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_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
77#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
78
79/* Work to do on interrupt/exception return. */
80#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
81 _TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL)
82
83#define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */
84#define TS_UAC_NOFIX 0x0002 /* ! flags as they match */
85#define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */
86
87#define TS_SAVED_FP 0x0008
88#define TS_RESTORE_FP 0x0010
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#ifndef __ASSEMBLER__
114extern void __save_fpu(void);
115
116static inline void save_fpu(void)
117{
118 if (!(current_thread_info()->status & TS_SAVED_FP)) {
119 current_thread_info()->status |= TS_SAVED_FP;
120 __save_fpu();
121 }
122}
123#endif
124
125#endif /* __KERNEL__ */
126#endif /* _ALPHA_THREAD_INFO_H */