1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * arch/arm/include/asm/thread_info.h 4 * 5 * Copyright (C) 2002 Russell King. 6 */ 7 #ifndef __ASM_ARM_THREAD_INFO_H 8 #define __ASM_ARM_THREAD_INFO_H 9 10 #ifdef __KERNEL__ 11 12 #include <linux/compiler.h> 13 #include <asm/fpstate.h> 14 #include <asm/page.h> 15 16 #define THREAD_SIZE_ORDER 1 17 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 18 #define THREAD_START_SP (THREAD_SIZE - 8) 19 20 #ifndef __ASSEMBLY__ 21 22 struct task_struct; 23 24 #include <asm/types.h> 25 26 typedef unsigned long mm_segment_t; 27 28 struct cpu_context_save { 29 __u32 r4; 30 __u32 r5; 31 __u32 r6; 32 __u32 r7; 33 __u32 r8; 34 __u32 r9; 35 __u32 sl; 36 __u32 fp; 37 __u32 sp; 38 __u32 pc; 39 __u32 extra[2]; /* Xscale 'acc' register, etc */ 40 }; 41 42 /* 43 * low level task data that entry.S needs immediate access to. 44 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 45 */ 46 struct thread_info { 47 unsigned long flags; /* low level flags */ 48 int preempt_count; /* 0 => preemptable, <0 => bug */ 49 mm_segment_t addr_limit; /* address limit */ 50 struct task_struct *task; /* main task structure */ 51 __u32 cpu; /* cpu */ 52 __u32 cpu_domain; /* cpu domain */ 53 #ifdef CONFIG_STACKPROTECTOR_PER_TASK 54 unsigned long stack_canary; 55 #endif 56 struct cpu_context_save cpu_context; /* cpu context */ 57 __u32 syscall; /* syscall number */ 58 __u8 used_cp[16]; /* thread used copro */ 59 unsigned long tp_value[2]; /* TLS registers */ 60 #ifdef CONFIG_CRUNCH 61 struct crunch_state crunchstate; 62 #endif 63 union fp_state fpstate __attribute__((aligned(8))); 64 union vfp_state vfpstate; 65 #ifdef CONFIG_ARM_THUMBEE 66 unsigned long thumbee_state; /* ThumbEE Handler Base register */ 67 #endif 68 }; 69 70 #define INIT_THREAD_INFO(tsk) \ 71 { \ 72 .task = &tsk, \ 73 .flags = 0, \ 74 .preempt_count = INIT_PREEMPT_COUNT, \ 75 .addr_limit = KERNEL_DS, \ 76 } 77 78 /* 79 * how to get the current stack pointer in C 80 */ 81 register unsigned long current_stack_pointer asm ("sp"); 82 83 /* 84 * how to get the thread information struct from C 85 */ 86 static inline struct thread_info *current_thread_info(void) __attribute_const__; 87 88 static inline struct thread_info *current_thread_info(void) 89 { 90 return (struct thread_info *) 91 (current_stack_pointer & ~(THREAD_SIZE - 1)); 92 } 93 94 #define thread_saved_pc(tsk) \ 95 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 96 #define thread_saved_sp(tsk) \ 97 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 98 99 #ifndef CONFIG_THUMB2_KERNEL 100 #define thread_saved_fp(tsk) \ 101 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 102 #else 103 #define thread_saved_fp(tsk) \ 104 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7)) 105 #endif 106 107 extern void crunch_task_disable(struct thread_info *); 108 extern void crunch_task_copy(struct thread_info *, void *); 109 extern void crunch_task_restore(struct thread_info *, void *); 110 extern void crunch_task_release(struct thread_info *); 111 112 extern void iwmmxt_task_disable(struct thread_info *); 113 extern void iwmmxt_task_copy(struct thread_info *, void *); 114 extern void iwmmxt_task_restore(struct thread_info *, void *); 115 extern void iwmmxt_task_release(struct thread_info *); 116 extern void iwmmxt_task_switch(struct thread_info *); 117 118 extern void vfp_sync_hwstate(struct thread_info *); 119 extern void vfp_flush_hwstate(struct thread_info *); 120 121 struct user_vfp; 122 struct user_vfp_exc; 123 124 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *, 125 struct user_vfp_exc *); 126 extern int vfp_restore_user_hwstate(struct user_vfp *, 127 struct user_vfp_exc *); 128 #endif 129 130 /* 131 * thread information flags: 132 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 133 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 134 */ 135 #define TIF_SIGPENDING 0 /* signal pending */ 136 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */ 137 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 138 #define TIF_UPROBE 3 /* breakpointed or singlestepping */ 139 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */ 140 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 141 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 142 #define TIF_SECCOMP 7 /* seccomp syscall filtering active */ 143 144 #define TIF_NOHZ 12 /* in adaptive nohz mode */ 145 #define TIF_USING_IWMMXT 17 146 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 147 #define TIF_RESTORE_SIGMASK 20 148 149 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 150 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 151 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 152 #define _TIF_UPROBE (1 << TIF_UPROBE) 153 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 154 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 155 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 156 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 157 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 158 159 /* Checks for any syscall work in entry-common.S */ 160 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 161 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 162 163 /* 164 * Change these and you break ASM code in entry-common.S 165 */ 166 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 167 _TIF_NOTIFY_RESUME | _TIF_UPROBE) 168 169 #endif /* __KERNEL__ */ 170 #endif /* __ASM_ARM_THREAD_INFO_H */ 171