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 #include <asm/types.h> 33 34 typedef unsigned long mm_segment_t; 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 mm_segment_t addr_limit; /* address limit */ 58 struct task_struct *task; /* main task structure */ 59 __u32 cpu; /* cpu */ 60 __u32 cpu_domain; /* cpu domain */ 61 #ifdef CONFIG_STACKPROTECTOR_PER_TASK 62 unsigned long stack_canary; 63 #endif 64 struct cpu_context_save cpu_context; /* cpu context */ 65 __u32 syscall; /* syscall number */ 66 __u8 used_cp[16]; /* thread used copro */ 67 unsigned long tp_value[2]; /* TLS registers */ 68 #ifdef CONFIG_CRUNCH 69 struct crunch_state crunchstate; 70 #endif 71 union fp_state fpstate __attribute__((aligned(8))); 72 union vfp_state vfpstate; 73 #ifdef CONFIG_ARM_THUMBEE 74 unsigned long thumbee_state; /* ThumbEE Handler Base register */ 75 #endif 76 }; 77 78 #define INIT_THREAD_INFO(tsk) \ 79 { \ 80 .task = &tsk, \ 81 .flags = 0, \ 82 .preempt_count = INIT_PREEMPT_COUNT, \ 83 .addr_limit = KERNEL_DS, \ 84 } 85 86 /* 87 * how to get the thread information struct from C 88 */ 89 static inline struct thread_info *current_thread_info(void) __attribute_const__; 90 91 static inline struct thread_info *current_thread_info(void) 92 { 93 return (struct thread_info *) 94 (current_stack_pointer & ~(THREAD_SIZE - 1)); 95 } 96 97 #define thread_saved_pc(tsk) \ 98 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 99 #define thread_saved_sp(tsk) \ 100 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 101 102 #ifndef CONFIG_THUMB2_KERNEL 103 #define thread_saved_fp(tsk) \ 104 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 105 #else 106 #define thread_saved_fp(tsk) \ 107 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7)) 108 #endif 109 110 extern void crunch_task_disable(struct thread_info *); 111 extern void crunch_task_copy(struct thread_info *, void *); 112 extern void crunch_task_restore(struct thread_info *, void *); 113 extern void crunch_task_release(struct thread_info *); 114 115 extern void iwmmxt_task_disable(struct thread_info *); 116 extern void iwmmxt_task_copy(struct thread_info *, void *); 117 extern void iwmmxt_task_restore(struct thread_info *, void *); 118 extern void iwmmxt_task_release(struct thread_info *); 119 extern void iwmmxt_task_switch(struct thread_info *); 120 121 extern void vfp_sync_hwstate(struct thread_info *); 122 extern void vfp_flush_hwstate(struct thread_info *); 123 124 struct user_vfp; 125 struct user_vfp_exc; 126 127 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *, 128 struct user_vfp_exc *); 129 extern int vfp_restore_user_hwstate(struct user_vfp *, 130 struct user_vfp_exc *); 131 #endif 132 133 /* 134 * thread information flags: 135 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 136 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 137 * 138 * Any bit in the range of 0..15 will cause do_work_pending() to be invoked. 139 */ 140 #define TIF_SIGPENDING 0 /* signal pending */ 141 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */ 142 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 143 #define TIF_UPROBE 3 /* breakpointed or singlestepping */ 144 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */ 145 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 146 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 147 #define TIF_SECCOMP 7 /* seccomp syscall filtering active */ 148 #define TIF_NOTIFY_SIGNAL 8 /* signal notifications exist */ 149 150 #define TIF_USING_IWMMXT 17 151 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 152 #define TIF_RESTORE_SIGMASK 20 153 154 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 155 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 156 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 157 #define _TIF_UPROBE (1 << TIF_UPROBE) 158 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 159 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 160 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 161 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 162 #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) 163 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 164 165 /* Checks for any syscall work in entry-common.S */ 166 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 167 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 168 169 /* 170 * Change these and you break ASM code in entry-common.S 171 */ 172 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 173 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ 174 _TIF_NOTIFY_SIGNAL) 175 176 #endif /* __KERNEL__ */ 177 #endif /* __ASM_ARM_THREAD_INFO_H */ 178