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 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ 78 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ 79 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \ 80 } 81 82 #define init_thread_info (init_thread_union.thread_info) 83 #define init_stack (init_thread_union.stack) 84 85 /* 86 * how to get the current stack pointer in C 87 */ 88 register unsigned long current_stack_pointer asm ("sp"); 89 90 /* 91 * how to get the thread information struct from C 92 */ 93 static inline struct thread_info *current_thread_info(void) __attribute_const__; 94 95 static inline struct thread_info *current_thread_info(void) 96 { 97 return (struct thread_info *) 98 (current_stack_pointer & ~(THREAD_SIZE - 1)); 99 } 100 101 #define thread_saved_pc(tsk) \ 102 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 103 #define thread_saved_sp(tsk) \ 104 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 105 106 #ifndef CONFIG_THUMB2_KERNEL 107 #define thread_saved_fp(tsk) \ 108 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 109 #else 110 #define thread_saved_fp(tsk) \ 111 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7)) 112 #endif 113 114 extern void crunch_task_disable(struct thread_info *); 115 extern void crunch_task_copy(struct thread_info *, void *); 116 extern void crunch_task_restore(struct thread_info *, void *); 117 extern void crunch_task_release(struct thread_info *); 118 119 extern void iwmmxt_task_disable(struct thread_info *); 120 extern void iwmmxt_task_copy(struct thread_info *, void *); 121 extern void iwmmxt_task_restore(struct thread_info *, void *); 122 extern void iwmmxt_task_release(struct thread_info *); 123 extern void iwmmxt_task_switch(struct thread_info *); 124 125 extern void vfp_sync_hwstate(struct thread_info *); 126 extern void vfp_flush_hwstate(struct thread_info *); 127 128 struct user_vfp; 129 struct user_vfp_exc; 130 131 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *, 132 struct user_vfp_exc __user *); 133 extern int vfp_restore_user_hwstate(struct user_vfp __user *, 134 struct user_vfp_exc __user *); 135 #endif 136 137 /* 138 * thread information flags: 139 * TIF_SYSCALL_TRACE - syscall trace active 140 * TIF_SYSCAL_AUDIT - syscall auditing active 141 * TIF_SIGPENDING - signal pending 142 * TIF_NEED_RESCHED - rescheduling necessary 143 * TIF_NOTIFY_RESUME - callback before returning to user 144 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 145 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 146 */ 147 #define TIF_SIGPENDING 0 148 #define TIF_NEED_RESCHED 1 149 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 150 #define TIF_UPROBE 7 151 #define TIF_SYSCALL_TRACE 8 152 #define TIF_SYSCALL_AUDIT 9 153 #define TIF_SYSCALL_TRACEPOINT 10 154 #define TIF_SECCOMP 11 /* seccomp syscall filtering active */ 155 #define TIF_NOHZ 12 /* in adaptive nohz mode */ 156 #define TIF_USING_IWMMXT 17 157 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 158 #define TIF_RESTORE_SIGMASK 20 159 160 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 161 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 162 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 163 #define _TIF_UPROBE (1 << TIF_UPROBE) 164 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 165 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 166 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 167 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 168 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 169 170 /* Checks for any syscall work in entry-common.S */ 171 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 172 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 173 174 /* 175 * Change these and you break ASM code in entry-common.S 176 */ 177 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 178 _TIF_NOTIFY_RESUME | _TIF_UPROBE) 179 180 #endif /* __KERNEL__ */ 181 #endif /* __ASM_ARM_THREAD_INFO_H */ 182