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