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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_THREAD_INFO_H
3#define __ASM_SH_THREAD_INFO_H
4
5/* SuperH version
6 * Copyright (C) 2002 Niibe Yutaka
7 *
8 * The copyright of original i386 version is:
9 *
10 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
11 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
12 */
13#include <asm/page.h>
14
15/*
16 * Page fault error code bits
17 */
18#define FAULT_CODE_WRITE (1 << 0) /* write access */
19#define FAULT_CODE_INITIAL (1 << 1) /* initial page write */
20#define FAULT_CODE_ITLB (1 << 2) /* ITLB miss */
21#define FAULT_CODE_PROT (1 << 3) /* protection fault */
22#define FAULT_CODE_USER (1 << 4) /* user-mode access */
23
24#ifndef __ASSEMBLY__
25#include <asm/processor.h>
26
27struct thread_info {
28 struct task_struct *task; /* main task structure */
29 unsigned long flags; /* low level flags */
30 __u32 status; /* thread synchronous flags */
31 __u32 cpu;
32 int preempt_count; /* 0 => preemptable, <0 => BUG */
33 unsigned long previous_sp; /* sp of previous stack in case
34 of nested IRQ stacks */
35 __u8 supervisor_stack[];
36};
37
38#endif
39
40#if defined(CONFIG_4KSTACKS)
41#define THREAD_SHIFT 12
42#else
43#define THREAD_SHIFT 13
44#endif
45
46#define THREAD_SIZE (1 << THREAD_SHIFT)
47#define STACK_WARN (THREAD_SIZE >> 3)
48
49/*
50 * macros/functions for gaining access to the thread information structure
51 */
52#ifndef __ASSEMBLY__
53#define INIT_THREAD_INFO(tsk) \
54{ \
55 .task = &tsk, \
56 .flags = 0, \
57 .status = 0, \
58 .cpu = 0, \
59 .preempt_count = INIT_PREEMPT_COUNT, \
60}
61
62/* how to get the current stack pointer from C */
63register unsigned long current_stack_pointer asm("r15") __used;
64
65/* how to get the thread information struct from C */
66static inline struct thread_info *current_thread_info(void)
67{
68 struct thread_info *ti;
69#if defined(CONFIG_CPU_HAS_SR_RB)
70 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
71#else
72 unsigned long __dummy;
73
74 __asm__ __volatile__ (
75 "mov r15, %0\n\t"
76 "and %1, %0\n\t"
77 : "=&r" (ti), "=r" (__dummy)
78 : "1" (~(THREAD_SIZE - 1))
79 : "memory");
80#endif
81
82 return ti;
83}
84
85#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
86
87extern void arch_task_cache_init(void);
88extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
89extern void arch_release_task_struct(struct task_struct *tsk);
90extern void init_thread_xstate(void);
91
92#endif /* __ASSEMBLY__ */
93
94/*
95 * Thread information flags
96 *
97 * - Limited to 24 bits, upper byte used for fault code encoding.
98 *
99 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
100 * we blow the tst immediate size constraints and need to fix up
101 * arch/sh/kernel/entry-common.S.
102 */
103#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
104#define TIF_SIGPENDING 1 /* signal pending */
105#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
106#define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */
107#define TIF_SINGLESTEP 4 /* singlestepping active */
108#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
109#define TIF_SECCOMP 6 /* secure computing */
110#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
111#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
112#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
113#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
114
115#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
116#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
117#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
118#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
119#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
120#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
121#define _TIF_SECCOMP (1 << TIF_SECCOMP)
122#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
123#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
124#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
125
126/* work to do in syscall trace */
127#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
128 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
129 _TIF_SYSCALL_TRACEPOINT)
130
131/* work to do on any return to u-space */
132#define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
133 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
134 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \
135 _TIF_SYSCALL_TRACEPOINT | _TIF_NOTIFY_SIGNAL)
136
137/* work to do on interrupt/exception return */
138#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
139 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
140
141/*
142 * Thread-synchronous status.
143 *
144 * This is different from the flags in that nobody else
145 * ever touches our thread-synchronous status, so we don't
146 * have to worry about atomic accesses.
147 */
148#define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */
149
150#ifndef __ASSEMBLY__
151
152#define TI_FLAG_FAULT_CODE_SHIFT 24
153
154/*
155 * Additional thread flag encoding
156 */
157static inline void set_thread_fault_code(unsigned int val)
158{
159 struct thread_info *ti = current_thread_info();
160 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
161 | (val << TI_FLAG_FAULT_CODE_SHIFT);
162}
163
164static inline unsigned int get_thread_fault_code(void)
165{
166 struct thread_info *ti = current_thread_info();
167 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
168}
169
170#endif /* !__ASSEMBLY__ */
171#endif /* __ASM_SH_THREAD_INFO_H */
1#ifndef __ASM_SH_THREAD_INFO_H
2#define __ASM_SH_THREAD_INFO_H
3
4/* SuperH version
5 * Copyright (C) 2002 Niibe Yutaka
6 *
7 * The copyright of original i386 version is:
8 *
9 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
10 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
11 */
12#ifdef __KERNEL__
13
14#include <asm/page.h>
15
16/*
17 * Page fault error code bits
18 */
19#define FAULT_CODE_WRITE (1 << 0) /* write access */
20#define FAULT_CODE_INITIAL (1 << 1) /* initial page write */
21#define FAULT_CODE_ITLB (1 << 2) /* ITLB miss */
22#define FAULT_CODE_PROT (1 << 3) /* protection fault */
23#define FAULT_CODE_USER (1 << 4) /* user-mode access */
24
25#ifndef __ASSEMBLY__
26#include <asm/processor.h>
27
28struct thread_info {
29 struct task_struct *task; /* main task structure */
30 struct exec_domain *exec_domain; /* execution domain */
31 unsigned long flags; /* low level flags */
32 __u32 status; /* thread synchronous flags */
33 __u32 cpu;
34 int preempt_count; /* 0 => preemptable, <0 => BUG */
35 mm_segment_t addr_limit; /* thread address space */
36 struct restart_block restart_block;
37 unsigned long previous_sp; /* sp of previous stack in case
38 of nested IRQ stacks */
39 __u8 supervisor_stack[0];
40};
41
42#endif
43
44#if defined(CONFIG_4KSTACKS)
45#define THREAD_SHIFT 12
46#else
47#define THREAD_SHIFT 13
48#endif
49
50#define THREAD_SIZE (1 << THREAD_SHIFT)
51#define STACK_WARN (THREAD_SIZE >> 3)
52
53/*
54 * macros/functions for gaining access to the thread information structure
55 */
56#ifndef __ASSEMBLY__
57#define INIT_THREAD_INFO(tsk) \
58{ \
59 .task = &tsk, \
60 .exec_domain = &default_exec_domain, \
61 .flags = 0, \
62 .status = 0, \
63 .cpu = 0, \
64 .preempt_count = INIT_PREEMPT_COUNT, \
65 .addr_limit = KERNEL_DS, \
66 .restart_block = { \
67 .fn = do_no_restart_syscall, \
68 }, \
69}
70
71#define init_thread_info (init_thread_union.thread_info)
72#define init_stack (init_thread_union.stack)
73
74/* how to get the current stack pointer from C */
75register unsigned long current_stack_pointer asm("r15") __used;
76
77/* how to get the thread information struct from C */
78static inline struct thread_info *current_thread_info(void)
79{
80 struct thread_info *ti;
81#if defined(CONFIG_SUPERH64)
82 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
83#elif defined(CONFIG_CPU_HAS_SR_RB)
84 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
85#else
86 unsigned long __dummy;
87
88 __asm__ __volatile__ (
89 "mov r15, %0\n\t"
90 "and %1, %0\n\t"
91 : "=&r" (ti), "=r" (__dummy)
92 : "1" (~(THREAD_SIZE - 1))
93 : "memory");
94#endif
95
96 return ti;
97}
98
99#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
100
101extern void arch_task_cache_init(void);
102extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
103extern void arch_release_task_struct(struct task_struct *tsk);
104extern void init_thread_xstate(void);
105
106#endif /* __ASSEMBLY__ */
107
108/*
109 * Thread information flags
110 *
111 * - Limited to 24 bits, upper byte used for fault code encoding.
112 *
113 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
114 * we blow the tst immediate size constraints and need to fix up
115 * arch/sh/kernel/entry-common.S.
116 */
117#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
118#define TIF_SIGPENDING 1 /* signal pending */
119#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
120#define TIF_SINGLESTEP 4 /* singlestepping active */
121#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
122#define TIF_SECCOMP 6 /* secure computing */
123#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
124#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
125#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
126#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
127
128#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
129#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
130#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
131#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
132#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
133#define _TIF_SECCOMP (1 << TIF_SECCOMP)
134#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
135#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
136#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
137
138/* work to do in syscall trace */
139#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
140 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
141 _TIF_SYSCALL_TRACEPOINT)
142
143/* work to do on any return to u-space */
144#define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
145 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
146 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \
147 _TIF_SYSCALL_TRACEPOINT)
148
149/* work to do on interrupt/exception return */
150#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
151 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
152
153/*
154 * Thread-synchronous status.
155 *
156 * This is different from the flags in that nobody else
157 * ever touches our thread-synchronous status, so we don't
158 * have to worry about atomic accesses.
159 */
160#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
161#define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */
162
163#ifndef __ASSEMBLY__
164
165#define HAVE_SET_RESTORE_SIGMASK 1
166static inline void set_restore_sigmask(void)
167{
168 struct thread_info *ti = current_thread_info();
169 ti->status |= TS_RESTORE_SIGMASK;
170 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
171}
172
173#define TI_FLAG_FAULT_CODE_SHIFT 24
174
175/*
176 * Additional thread flag encoding
177 */
178static inline void set_thread_fault_code(unsigned int val)
179{
180 struct thread_info *ti = current_thread_info();
181 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
182 | (val << TI_FLAG_FAULT_CODE_SHIFT);
183}
184
185static inline unsigned int get_thread_fault_code(void)
186{
187 struct thread_info *ti = current_thread_info();
188 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
189}
190
191static inline void clear_restore_sigmask(void)
192{
193 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
194}
195static inline bool test_restore_sigmask(void)
196{
197 return current_thread_info()->status & TS_RESTORE_SIGMASK;
198}
199static inline bool test_and_clear_restore_sigmask(void)
200{
201 struct thread_info *ti = current_thread_info();
202 if (!(ti->status & TS_RESTORE_SIGMASK))
203 return false;
204 ti->status &= ~TS_RESTORE_SIGMASK;
205 return true;
206}
207
208#endif /* !__ASSEMBLY__ */
209
210#endif /* __KERNEL__ */
211
212#endif /* __ASM_SH_THREAD_INFO_H */