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 #ifdef CONFIG_KASAN 17 /* 18 * KASan uses a lot of extra stack space so the thread size order needs to 19 * be increased. 20 */ 21 #define THREAD_SIZE_ORDER 2 22 #else 23 #define THREAD_SIZE_ORDER 1 24 #endif 25 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 26 #define THREAD_START_SP (THREAD_SIZE - 8) 27 28 #ifndef __ASSEMBLY__ 29 30 struct task_struct; 31 32 DECLARE_PER_CPU(struct task_struct *, __entry_task); 33 34 #include <asm/types.h> 35 36 struct cpu_context_save { 37 __u32 r4; 38 __u32 r5; 39 __u32 r6; 40 __u32 r7; 41 __u32 r8; 42 __u32 r9; 43 __u32 sl; 44 __u32 fp; 45 __u32 sp; 46 __u32 pc; 47 __u32 extra[2]; /* Xscale 'acc' register, etc */ 48 }; 49 50 /* 51 * low level task data that entry.S needs immediate access to. 52 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 53 */ 54 struct thread_info { 55 unsigned long flags; /* low level flags */ 56 int preempt_count; /* 0 => preemptable, <0 => bug */ 57 #ifndef CONFIG_THREAD_INFO_IN_TASK 58 struct task_struct *task; /* main task structure */ 59 #endif 60 __u32 cpu; /* cpu */ 61 __u32 cpu_domain; /* cpu domain */ 62 struct cpu_context_save cpu_context; /* cpu context */ 63 __u32 abi_syscall; /* ABI type and syscall nr */ 64 __u8 used_cp[16]; /* thread used copro */ 65 unsigned long tp_value[2]; /* TLS registers */ 66 union fp_state fpstate __attribute__((aligned(8))); 67 union vfp_state vfpstate; 68 #ifdef CONFIG_ARM_THUMBEE 69 unsigned long thumbee_state; /* ThumbEE Handler Base register */ 70 #endif 71 }; 72 73 #define INIT_THREAD_INFO(tsk) \ 74 { \ 75 INIT_THREAD_INFO_TASK(tsk) \ 76 .flags = 0, \ 77 .preempt_count = INIT_PREEMPT_COUNT, \ 78 } 79 80 #ifdef CONFIG_THREAD_INFO_IN_TASK 81 #define INIT_THREAD_INFO_TASK(tsk) 82 83 static inline struct task_struct *thread_task(struct thread_info* ti) 84 { 85 return (struct task_struct *)ti; 86 } 87 88 #else 89 #define INIT_THREAD_INFO_TASK(tsk) .task = &(tsk), 90 91 static inline struct task_struct *thread_task(struct thread_info* ti) 92 { 93 return ti->task; 94 } 95 96 /* 97 * how to get the thread information struct from C 98 */ 99 static inline struct thread_info *current_thread_info(void) __attribute_const__; 100 101 static inline struct thread_info *current_thread_info(void) 102 { 103 return (struct thread_info *) 104 (current_stack_pointer & ~(THREAD_SIZE - 1)); 105 } 106 #endif 107 108 #define thread_saved_pc(tsk) \ 109 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 110 #define thread_saved_sp(tsk) \ 111 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 112 113 #ifndef CONFIG_THUMB2_KERNEL 114 #define thread_saved_fp(tsk) \ 115 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 116 #else 117 #define thread_saved_fp(tsk) \ 118 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7)) 119 #endif 120 121 extern void iwmmxt_task_disable(struct thread_info *); 122 extern void iwmmxt_task_copy(struct thread_info *, void *); 123 extern void iwmmxt_task_restore(struct thread_info *, void *); 124 extern void iwmmxt_task_release(struct thread_info *); 125 extern void iwmmxt_task_switch(struct thread_info *); 126 127 extern void vfp_sync_hwstate(struct thread_info *); 128 extern void vfp_flush_hwstate(struct thread_info *); 129 130 struct user_vfp; 131 struct user_vfp_exc; 132 133 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *, 134 struct user_vfp_exc *); 135 extern int vfp_restore_user_hwstate(struct user_vfp *, 136 struct user_vfp_exc *); 137 #endif 138 139 /* 140 * thread information flags: 141 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 142 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 143 * 144 * Any bit in the range of 0..15 will cause do_work_pending() to be invoked. 145 */ 146 #define TIF_SIGPENDING 0 /* signal pending */ 147 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */ 148 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 149 #define TIF_UPROBE 3 /* breakpointed or singlestepping */ 150 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */ 151 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 152 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 153 #define TIF_SECCOMP 7 /* seccomp syscall filtering active */ 154 #define TIF_NOTIFY_SIGNAL 8 /* signal notifications exist */ 155 156 #define TIF_USING_IWMMXT 17 157 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 158 #define TIF_RESTORE_SIGMASK 20 159 160 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 161 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 162 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 163 #define _TIF_UPROBE (1 << TIF_UPROBE) 164 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 165 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 166 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 167 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 168 #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) 169 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 170 171 /* Checks for any syscall work in entry-common.S */ 172 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 173 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 174 175 /* 176 * Change these and you break ASM code in entry-common.S 177 */ 178 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 179 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ 180 _TIF_NOTIFY_SIGNAL) 181 182 #endif /* __KERNEL__ */ 183 #endif /* __ASM_ARM_THREAD_INFO_H */ 184