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 #include <asm/domain.h> 29 30 typedef unsigned long mm_segment_t; 31 32 struct cpu_context_save { 33 __u32 r4; 34 __u32 r5; 35 __u32 r6; 36 __u32 r7; 37 __u32 r8; 38 __u32 r9; 39 __u32 sl; 40 __u32 fp; 41 __u32 sp; 42 __u32 pc; 43 __u32 extra[2]; /* Xscale 'acc' register, etc */ 44 }; 45 46 /* 47 * low level task data that entry.S needs immediate access to. 48 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 49 */ 50 struct thread_info { 51 unsigned long flags; /* low level flags */ 52 int preempt_count; /* 0 => preemptable, <0 => bug */ 53 mm_segment_t addr_limit; /* address limit */ 54 struct task_struct *task; /* main task structure */ 55 __u32 cpu; /* cpu */ 56 __u32 cpu_domain; /* cpu domain */ 57 struct cpu_context_save cpu_context; /* cpu context */ 58 __u32 syscall; /* syscall number */ 59 __u8 used_cp[16]; /* thread used copro */ 60 unsigned long tp_value[2]; /* TLS registers */ 61 #ifdef CONFIG_CRUNCH 62 struct crunch_state crunchstate; 63 #endif 64 union fp_state fpstate __attribute__((aligned(8))); 65 union vfp_state vfpstate; 66 #ifdef CONFIG_ARM_THUMBEE 67 unsigned long thumbee_state; /* ThumbEE Handler Base register */ 68 #endif 69 }; 70 71 #define INIT_THREAD_INFO(tsk) \ 72 { \ 73 .task = &tsk, \ 74 .flags = 0, \ 75 .preempt_count = INIT_PREEMPT_COUNT, \ 76 .addr_limit = KERNEL_DS, \ 77 } 78 79 #define init_thread_info (init_thread_union.thread_info) 80 #define init_stack (init_thread_union.stack) 81 82 /* 83 * how to get the current stack pointer in C 84 */ 85 register unsigned long current_stack_pointer asm ("sp"); 86 87 /* 88 * how to get the thread information struct from C 89 */ 90 static inline struct thread_info *current_thread_info(void) __attribute_const__; 91 92 static inline struct thread_info *current_thread_info(void) 93 { 94 return (struct thread_info *) 95 (current_stack_pointer & ~(THREAD_SIZE - 1)); 96 } 97 98 #define thread_saved_pc(tsk) \ 99 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 100 #define thread_saved_sp(tsk) \ 101 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 102 103 #ifndef CONFIG_THUMB2_KERNEL 104 #define thread_saved_fp(tsk) \ 105 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 106 #else 107 #define thread_saved_fp(tsk) \ 108 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7)) 109 #endif 110 111 extern void crunch_task_disable(struct thread_info *); 112 extern void crunch_task_copy(struct thread_info *, void *); 113 extern void crunch_task_restore(struct thread_info *, void *); 114 extern void crunch_task_release(struct thread_info *); 115 116 extern void iwmmxt_task_disable(struct thread_info *); 117 extern void iwmmxt_task_copy(struct thread_info *, void *); 118 extern void iwmmxt_task_restore(struct thread_info *, void *); 119 extern void iwmmxt_task_release(struct thread_info *); 120 extern void iwmmxt_task_switch(struct thread_info *); 121 122 extern void vfp_sync_hwstate(struct thread_info *); 123 extern void vfp_flush_hwstate(struct thread_info *); 124 125 struct user_vfp; 126 struct user_vfp_exc; 127 128 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *, 129 struct user_vfp_exc __user *); 130 extern int vfp_restore_user_hwstate(struct user_vfp __user *, 131 struct user_vfp_exc __user *); 132 #endif 133 134 /* 135 * thread information flags: 136 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 137 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 138 */ 139 #define TIF_SIGPENDING 0 /* signal pending */ 140 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */ 141 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 142 #define TIF_UPROBE 3 /* breakpointed or singlestepping */ 143 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */ 144 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 145 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 146 #define TIF_SECCOMP 7 /* seccomp syscall filtering active */ 147 148 #define TIF_NOHZ 12 /* in adaptive nohz mode */ 149 #define TIF_USING_IWMMXT 17 150 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 151 #define TIF_RESTORE_SIGMASK 20 152 153 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 154 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 155 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 156 #define _TIF_UPROBE (1 << TIF_UPROBE) 157 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 158 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 159 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 160 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 161 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 162 163 /* Checks for any syscall work in entry-common.S */ 164 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 165 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 166 167 /* 168 * Change these and you break ASM code in entry-common.S 169 */ 170 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 171 _TIF_NOTIFY_RESUME | _TIF_UPROBE) 172 173 #endif /* __KERNEL__ */ 174 #endif /* __ASM_ARM_THREAD_INFO_H */ 175