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