1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * thread_info.h: sparc low-level thread information
4 * adapted from the ppc version by Pete Zaitcev, which was
5 * adapted from the i386 version by Paul Mackerras
6 *
7 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
8 * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
9 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
10 */
11
12 #ifndef _ASM_THREAD_INFO_H
13 #define _ASM_THREAD_INFO_H
14
15 #ifdef __KERNEL__
16
17 #ifndef __ASSEMBLY__
18
19 #include <asm/ptrace.h>
20 #include <asm/page.h>
21
22 /*
23 * Low level task data.
24 *
25 * If you change this, change the TI_* offsets below to match.
26 */
27 #define NSWINS 8
28 struct thread_info {
29 unsigned long uwinmask;
30 struct task_struct *task; /* main task structure */
31 unsigned long flags; /* low level flags */
32 int cpu; /* cpu we're on */
33 int preempt_count; /* 0 => preemptable,
34 <0 => BUG */
35 int softirq_count;
36 int hardirq_count;
37
38 u32 __unused;
39
40 /* Context switch saved kernel state. */
41 unsigned long ksp; /* ... ksp __attribute__ ((aligned (8))); */
42 unsigned long kpc;
43 unsigned long kpsr;
44 unsigned long kwim;
45
46 /* A place to store user windows and stack pointers
47 * when the stack needs inspection.
48 */
49 struct reg_window32 reg_window[NSWINS]; /* align for ldd! */
50 unsigned long rwbuf_stkptrs[NSWINS];
51 unsigned long w_saved;
52 };
53
54 /*
55 * macros/functions for gaining access to the thread information structure
56 */
57 #define INIT_THREAD_INFO(tsk) \
58 { \
59 .uwinmask = 0, \
60 .task = &tsk, \
61 .flags = 0, \
62 .cpu = 0, \
63 .preempt_count = INIT_PREEMPT_COUNT, \
64 }
65
66 /* how to get the thread information struct from C */
67 register struct thread_info *current_thread_info_reg asm("g6");
68 #define current_thread_info() (current_thread_info_reg)
69
70 /*
71 * thread information allocation
72 */
73 #define THREAD_SIZE_ORDER 1
74
75 #endif /* __ASSEMBLY__ */
76
77 /* Size of kernel stack for each process */
78 #define THREAD_SIZE (2 * PAGE_SIZE)
79
80 /*
81 * Offsets in thread_info structure, used in assembly code
82 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
83 */
84 #define TI_UWINMASK 0x00 /* uwinmask */
85 #define TI_TASK 0x04
86 #define TI_FLAGS 0x08
87 #define TI_CPU 0x0c
88 #define TI_PREEMPT 0x10 /* preempt_count */
89 #define TI_SOFTIRQ 0x14 /* softirq_count */
90 #define TI_HARDIRQ 0x18 /* hardirq_count */
91 #define TI_KSP 0x20 /* ksp */
92 #define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */
93 #define TI_KPSR 0x28 /* kpsr */
94 #define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */
95 #define TI_REG_WINDOW 0x30
96 #define TI_RWIN_SPTRS 0x230
97 #define TI_W_SAVED 0x250
98
99 /*
100 * thread information flag bit numbers
101 */
102 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
103 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
104 #define TIF_SIGPENDING 2 /* signal pending */
105 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
106 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
107 #define TIF_USEDFPU 8 /* FPU was used by this task
108 * this quantum (SMP) */
109 #define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling
110 * TIF_NEED_RESCHED */
111 #define TIF_MEMDIE 10 /* is terminating due to OOM killer */
112
113 /* as above, but as bit values */
114 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
115 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
116 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
117 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
118 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
119 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
120
121 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \
122 _TIF_SIGPENDING)
123
124 #define is_32bit_task() (1)
125
126 #endif /* __KERNEL__ */
127
128 #endif /* _ASM_THREAD_INFO_H */