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 struct exec_domain; 27 28 #include <asm/types.h> 29 #include <asm/domain.h> 30 31 typedef unsigned long mm_segment_t; 32 33 struct cpu_context_save { 34 __u32 r4; 35 __u32 r5; 36 __u32 r6; 37 __u32 r7; 38 __u32 r8; 39 __u32 r9; 40 __u32 sl; 41 __u32 fp; 42 __u32 sp; 43 __u32 pc; 44 __u32 extra[2]; /* Xscale 'acc' register, etc */ 45 }; 46 47 struct arm_restart_block { 48 union { 49 /* For user cache flushing */ 50 struct { 51 unsigned long start; 52 unsigned long end; 53 } cache; 54 }; 55 }; 56 57 /* 58 * low level task data that entry.S needs immediate access to. 59 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 60 */ 61 struct thread_info { 62 unsigned long flags; /* low level flags */ 63 int preempt_count; /* 0 => preemptable, <0 => bug */ 64 mm_segment_t addr_limit; /* address limit */ 65 struct task_struct *task; /* main task structure */ 66 struct exec_domain *exec_domain; /* execution domain */ 67 __u32 cpu; /* cpu */ 68 __u32 cpu_domain; /* cpu domain */ 69 struct cpu_context_save cpu_context; /* cpu context */ 70 __u32 syscall; /* syscall number */ 71 __u8 used_cp[16]; /* thread used copro */ 72 unsigned long tp_value[2]; /* TLS registers */ 73 #ifdef CONFIG_CRUNCH 74 struct crunch_state crunchstate; 75 #endif 76 union fp_state fpstate __attribute__((aligned(8))); 77 union vfp_state vfpstate; 78 #ifdef CONFIG_ARM_THUMBEE 79 unsigned long thumbee_state; /* ThumbEE Handler Base register */ 80 #endif 81 struct restart_block restart_block; 82 struct arm_restart_block arm_restart_block; 83 }; 84 85 #define INIT_THREAD_INFO(tsk) \ 86 { \ 87 .task = &tsk, \ 88 .exec_domain = &default_exec_domain, \ 89 .flags = 0, \ 90 .preempt_count = INIT_PREEMPT_COUNT, \ 91 .addr_limit = KERNEL_DS, \ 92 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ 93 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ 94 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \ 95 .restart_block = { \ 96 .fn = do_no_restart_syscall, \ 97 }, \ 98 } 99 100 #define init_thread_info (init_thread_union.thread_info) 101 #define init_stack (init_thread_union.stack) 102 103 /* 104 * how to get the thread information struct from C 105 */ 106 static inline struct thread_info *current_thread_info(void) __attribute_const__; 107 108 static inline struct thread_info *current_thread_info(void) 109 { 110 register unsigned long sp asm ("sp"); 111 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 112 } 113 114 #define thread_saved_pc(tsk) \ 115 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) 116 #define thread_saved_sp(tsk) \ 117 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) 118 119 #ifndef CONFIG_THUMB2_KERNEL 120 #define thread_saved_fp(tsk) \ 121 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) 122 #else 123 #define thread_saved_fp(tsk) \ 124 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7)) 125 #endif 126 127 extern void crunch_task_disable(struct thread_info *); 128 extern void crunch_task_copy(struct thread_info *, void *); 129 extern void crunch_task_restore(struct thread_info *, void *); 130 extern void crunch_task_release(struct thread_info *); 131 132 extern void iwmmxt_task_disable(struct thread_info *); 133 extern void iwmmxt_task_copy(struct thread_info *, void *); 134 extern void iwmmxt_task_restore(struct thread_info *, void *); 135 extern void iwmmxt_task_release(struct thread_info *); 136 extern void iwmmxt_task_switch(struct thread_info *); 137 138 extern void vfp_sync_hwstate(struct thread_info *); 139 extern void vfp_flush_hwstate(struct thread_info *); 140 141 struct user_vfp; 142 struct user_vfp_exc; 143 144 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *, 145 struct user_vfp_exc __user *); 146 extern int vfp_restore_user_hwstate(struct user_vfp __user *, 147 struct user_vfp_exc __user *); 148 #endif 149 150 /* 151 * thread information flags: 152 * TIF_SYSCALL_TRACE - syscall trace active 153 * TIF_SYSCAL_AUDIT - syscall auditing active 154 * TIF_SIGPENDING - signal pending 155 * TIF_NEED_RESCHED - rescheduling necessary 156 * TIF_NOTIFY_RESUME - callback before returning to user 157 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 158 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED 159 */ 160 #define TIF_SIGPENDING 0 161 #define TIF_NEED_RESCHED 1 162 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 163 #define TIF_UPROBE 7 164 #define TIF_SYSCALL_TRACE 8 165 #define TIF_SYSCALL_AUDIT 9 166 #define TIF_SYSCALL_TRACEPOINT 10 167 #define TIF_SECCOMP 11 /* seccomp syscall filtering active */ 168 #define TIF_NOHZ 12 /* in adaptive nohz mode */ 169 #define TIF_USING_IWMMXT 17 170 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 171 #define TIF_RESTORE_SIGMASK 20 172 173 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 174 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 175 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 176 #define _TIF_UPROBE (1 << TIF_UPROBE) 177 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 178 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 179 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 180 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 181 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) 182 183 /* Checks for any syscall work in entry-common.S */ 184 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 185 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 186 187 /* 188 * Change these and you break ASM code in entry-common.S 189 */ 190 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 191 _TIF_NOTIFY_RESUME | _TIF_UPROBE) 192 193 #endif /* __KERNEL__ */ 194 #endif /* __ASM_ARM_THREAD_INFO_H */ 195