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 #ifdef CONFIG_VMAP_STACK 29 #define THREAD_ALIGN (2 * THREAD_SIZE) 30 #else 31 #define THREAD_ALIGN THREAD_SIZE 32 #endif 33 34 #define OVERFLOW_STACK_SIZE SZ_4K 35 36 #ifndef __ASSEMBLY__ 37 38 struct task_struct; 39 40 DECLARE_PER_CPU(struct task_struct *, __entry_task); 41 42 #include <asm/types.h> 43 #include <asm/traps.h> 44 45 struct cpu_context_save { 46 __u32 r4; 47 __u32 r5; 48 __u32 r6; 49 __u32 r7; 50 __u32 r8; 51 __u32 r9; 52 __u32 sl; 53 __u32 fp; 54 __u32 sp; 55 __u32 pc; 56 __u32 extra[2]; /* Xscale 'acc' register, etc */ 57 }; 58 59 /* 60 * low level task data that entry.S needs immediate access to. 61 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 62 */ 63 struct thread_info { 64 unsigned long flags; /* low level flags */ 65 int preempt_count; /* 0 => preemptable, <0 => bug */ 66 __u32 cpu; /* cpu */ 67 __u32 cpu_domain; /* cpu domain */ 68 struct cpu_context_save cpu_context; /* cpu context */ 69 __u32 abi_syscall; /* ABI type and syscall nr */ 70 unsigned long tp_value[2]; /* TLS registers */ 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 .flags = 0, \ 81 .preempt_count = INIT_PREEMPT_COUNT, \ 82 } 83 84 static inline struct task_struct *thread_task(struct thread_info* ti) 85 { 86 return (struct task_struct *)ti; 87 } 88 89 #define thread_saved_pc(tsk) \ 90 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 91 #define thread_saved_sp(tsk) \ 92 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 93 94 #ifndef CONFIG_THUMB2_KERNEL 95 #define thread_saved_fp(tsk) \ 96 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 97 #else 98 #define thread_saved_fp(tsk) \ 99 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7)) 100 #endif 101 102 extern void iwmmxt_task_disable(struct thread_info *); 103 extern void iwmmxt_task_copy(struct thread_info *, void *); 104 extern void iwmmxt_task_restore(struct thread_info *, void *); 105 extern void iwmmxt_task_release(struct thread_info *); 106 extern void iwmmxt_task_switch(struct thread_info *); 107 108 extern int iwmmxt_undef_handler(struct pt_regs *, u32); 109 110 static inline void register_iwmmxt_undef_handler(void) 111 { 112 static struct undef_hook iwmmxt_undef_hook = { 113 .instr_mask = 0x0c000e00, 114 .instr_val = 0x0c000000, 115 .cpsr_mask = MODE_MASK | PSR_T_BIT, 116 .cpsr_val = USR_MODE, 117 .fn = iwmmxt_undef_handler, 118 }; 119 120 register_undef_hook(&iwmmxt_undef_hook); 121 } 122 123 extern void vfp_sync_hwstate(struct thread_info *); 124 extern void vfp_flush_hwstate(struct thread_info *); 125 126 struct user_vfp; 127 struct user_vfp_exc; 128 129 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *, 130 struct user_vfp_exc *); 131 extern int vfp_restore_user_hwstate(struct user_vfp *, 132 struct user_vfp_exc *); 133 #endif 134 135 /* 136 * thread information flags: 137 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 138 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 139 * 140 * Any bit in the range of 0..15 will cause do_work_pending() to be invoked. 141 */ 142 #define TIF_SIGPENDING 0 /* signal pending */ 143 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */ 144 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 145 #define TIF_UPROBE 3 /* breakpointed or singlestepping */ 146 #define TIF_NOTIFY_SIGNAL 4 /* signal notifications exist */ 147 148 #define TIF_USING_IWMMXT 17 149 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 150 #define TIF_RESTORE_SIGMASK 19 151 #define TIF_SYSCALL_TRACE 20 /* syscall trace active */ 152 #define TIF_SYSCALL_AUDIT 21 /* syscall auditing active */ 153 #define TIF_SYSCALL_TRACEPOINT 22 /* syscall tracepoint instrumentation */ 154 #define TIF_SECCOMP 23 /* seccomp syscall filtering active */ 155 156 157 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 158 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 159 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 160 #define _TIF_UPROBE (1 << TIF_UPROBE) 161 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 162 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 163 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 164 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 165 #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) 166 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 167 168 /* Checks for any syscall work in entry-common.S */ 169 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 170 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 171 172 /* 173 * Change these and you break ASM code in entry-common.S 174 */ 175 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 176 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ 177 _TIF_NOTIFY_SIGNAL) 178 179 #endif /* __KERNEL__ */ 180 #endif /* __ASM_ARM_THREAD_INFO_H */ 181