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