1 /* 2 * arch/arm/include/asm/thread_info.h 3 * 4 * Copyright (C) 2002 Russell King. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #ifndef __ASM_ARM_THREAD_INFO_H 11 #define __ASM_ARM_THREAD_INFO_H 12 13 #ifdef __KERNEL__ 14 15 #include <linux/compiler.h> 16 #include <asm/fpstate.h> 17 #include <asm/page.h> 18 19 #define THREAD_SIZE_ORDER 1 20 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 21 #define THREAD_START_SP (THREAD_SIZE - 8) 22 23 #ifndef __ASSEMBLY__ 24 25 struct task_struct; 26 27 #include <asm/types.h> 28 29 typedef unsigned long mm_segment_t; 30 31 struct cpu_context_save { 32 __u32 r4; 33 __u32 r5; 34 __u32 r6; 35 __u32 r7; 36 __u32 r8; 37 __u32 r9; 38 __u32 sl; 39 __u32 fp; 40 __u32 sp; 41 __u32 pc; 42 __u32 extra[2]; /* Xscale 'acc' register, etc */ 43 }; 44 45 /* 46 * low level task data that entry.S needs immediate access to. 47 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 48 */ 49 struct thread_info { 50 unsigned long flags; /* low level flags */ 51 int preempt_count; /* 0 => preemptable, <0 => bug */ 52 mm_segment_t addr_limit; /* address limit */ 53 struct task_struct *task; /* main task structure */ 54 __u32 cpu; /* cpu */ 55 __u32 cpu_domain; /* cpu domain */ 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 #define init_thread_info (init_thread_union.thread_info) 79 #define init_stack (init_thread_union.stack) 80 81 /* 82 * how to get the current stack pointer in C 83 */ 84 register unsigned long current_stack_pointer asm ("sp"); 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 __user *, 128 struct user_vfp_exc __user *); 129 extern int vfp_restore_user_hwstate(struct user_vfp __user *, 130 struct user_vfp_exc __user *); 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 #define TIF_SIGPENDING 0 /* signal pending */ 139 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */ 140 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 141 #define TIF_UPROBE 3 /* breakpointed or singlestepping */ 142 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */ 143 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 144 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 145 #define TIF_SECCOMP 7 /* seccomp syscall filtering active */ 146 147 #define TIF_NOHZ 12 /* in adaptive nohz mode */ 148 #define TIF_USING_IWMMXT 17 149 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 150 #define TIF_RESTORE_SIGMASK 20 151 152 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 153 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 154 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 155 #define _TIF_UPROBE (1 << TIF_UPROBE) 156 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 157 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 158 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 159 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 160 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 161 162 /* Checks for any syscall work in entry-common.S */ 163 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 164 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 165 166 /* 167 * Change these and you break ASM code in entry-common.S 168 */ 169 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 170 _TIF_NOTIFY_RESUME | _TIF_UPROBE) 171 172 #endif /* __KERNEL__ */ 173 #endif /* __ASM_ARM_THREAD_INFO_H */ 174