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 18 #define THREAD_SIZE_ORDER 1 19 #define THREAD_SIZE 8192 20 #define THREAD_START_SP (THREAD_SIZE - 8) 21 22 #ifndef __ASSEMBLY__ 23 24 struct task_struct; 25 struct exec_domain; 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 struct exec_domain *exec_domain; /* execution domain */ 56 __u32 cpu; /* cpu */ 57 __u32 cpu_domain; /* cpu domain */ 58 struct cpu_context_save cpu_context; /* cpu context */ 59 __u32 syscall; /* syscall number */ 60 __u8 used_cp[16]; /* thread used copro */ 61 unsigned long tp_value[2]; /* TLS registers */ 62 #ifdef CONFIG_CRUNCH 63 struct crunch_state crunchstate; 64 #endif 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 struct restart_block restart_block; 71 }; 72 73 #define INIT_THREAD_INFO(tsk) \ 74 { \ 75 .task = &tsk, \ 76 .exec_domain = &default_exec_domain, \ 77 .flags = 0, \ 78 .preempt_count = INIT_PREEMPT_COUNT, \ 79 .addr_limit = KERNEL_DS, \ 80 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ 81 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ 82 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \ 83 .restart_block = { \ 84 .fn = do_no_restart_syscall, \ 85 }, \ 86 } 87 88 #define init_thread_info (init_thread_union.thread_info) 89 #define init_stack (init_thread_union.stack) 90 91 /* 92 * how to get the thread information struct from C 93 */ 94 static inline struct thread_info *current_thread_info(void) __attribute_const__; 95 96 static inline struct thread_info *current_thread_info(void) 97 { 98 register unsigned long sp asm ("sp"); 99 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 100 } 101 102 #define thread_saved_pc(tsk) \ 103 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 104 #define thread_saved_sp(tsk) \ 105 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 106 #define thread_saved_fp(tsk) \ 107 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 108 109 extern void crunch_task_disable(struct thread_info *); 110 extern void crunch_task_copy(struct thread_info *, void *); 111 extern void crunch_task_restore(struct thread_info *, void *); 112 extern void crunch_task_release(struct thread_info *); 113 114 extern void iwmmxt_task_disable(struct thread_info *); 115 extern void iwmmxt_task_copy(struct thread_info *, void *); 116 extern void iwmmxt_task_restore(struct thread_info *, void *); 117 extern void iwmmxt_task_release(struct thread_info *); 118 extern void iwmmxt_task_switch(struct thread_info *); 119 120 extern void vfp_sync_hwstate(struct thread_info *); 121 extern void vfp_flush_hwstate(struct thread_info *); 122 123 struct user_vfp; 124 struct user_vfp_exc; 125 126 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *, 127 struct user_vfp_exc __user *); 128 extern int vfp_restore_user_hwstate(struct user_vfp __user *, 129 struct user_vfp_exc __user *); 130 #endif 131 132 /* 133 * We use bit 30 of the preempt_count to indicate that kernel 134 * preemption is occurring. See <asm/hardirq.h>. 135 */ 136 #define PREEMPT_ACTIVE 0x40000000 137 138 /* 139 * thread information flags: 140 * TIF_SYSCALL_TRACE - syscall trace active 141 * TIF_SYSCAL_AUDIT - syscall auditing active 142 * TIF_SIGPENDING - signal pending 143 * TIF_NEED_RESCHED - rescheduling necessary 144 * TIF_NOTIFY_RESUME - callback before returning to user 145 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 146 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 147 */ 148 #define TIF_SIGPENDING 0 149 #define TIF_NEED_RESCHED 1 150 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 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_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 164 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 165 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 166 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 167 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 168 169 /* Checks for any syscall work in entry-common.S */ 170 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 171 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 172 173 /* 174 * Change these and you break ASM code in entry-common.S 175 */ 176 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_RESUME) 177 178 #endif /* __KERNEL__ */ 179 #endif /* __ASM_ARM_THREAD_INFO_H */ 180