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__
15 struct 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. */
42 register struct thread_info *__current_thread_info __asm__("$8");
43 #define current_thread_info() __current_thread_info
44
45 register unsigned long *current_stack_pointer __asm__ ("$30");
46
47 #endif /* __ASSEMBLY__ */
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 __ASSEMBLY__
114 extern void __save_fpu(void);
115
116 static 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 */
127
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