thread_info.h (5258B)
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 */