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Linux/arch/sh/include/asm/thread_info.h

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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 
 27 struct 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 */
 63 register unsigned long current_stack_pointer asm("r15") __used;
 64 
 65 /* how to get the thread information struct from C */
 66 static 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 
 87 extern void arch_task_cache_init(void);
 88 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
 89 extern void arch_release_task_struct(struct task_struct *tsk);
 90 extern 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  */
157 static 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 
164 static 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 */
172 

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