1 /* 2 * Based on arch/arm/include/asm/thread_info.h 3 * 4 * Copyright (C) 2002 Russell King. 5 * Copyright (C) 2012 ARM Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 #ifndef __ASM_THREAD_INFO_H 20 #define __ASM_THREAD_INFO_H 21 22 #ifdef __KERNEL__ 23 24 #include <linux/compiler.h> 25 26 #ifndef CONFIG_ARM64_64K_PAGES 27 #define THREAD_SIZE_ORDER 2 28 #endif 29 30 #define THREAD_SIZE 16384 31 #define THREAD_START_SP (THREAD_SIZE - 16) 32 33 #ifndef __ASSEMBLY__ 34 35 struct task_struct; 36 struct exec_domain; 37 38 #include <asm/types.h> 39 40 typedef unsigned long mm_segment_t; 41 42 /* 43 * low level task data that entry.S needs immediate access to. 44 * __switch_to() assumes cpu_context follows immediately after cpu_domain. 45 */ 46 struct thread_info { 47 unsigned long flags; /* low level flags */ 48 mm_segment_t addr_limit; /* address limit */ 49 struct task_struct *task; /* main task structure */ 50 struct exec_domain *exec_domain; /* execution domain */ 51 struct restart_block restart_block; 52 int preempt_count; /* 0 => preemptable, <0 => bug */ 53 int cpu; /* cpu */ 54 }; 55 56 #define INIT_THREAD_INFO(tsk) \ 57 { \ 58 .task = &tsk, \ 59 .exec_domain = &default_exec_domain, \ 60 .flags = 0, \ 61 .preempt_count = INIT_PREEMPT_COUNT, \ 62 .addr_limit = KERNEL_DS, \ 63 .restart_block = { \ 64 .fn = do_no_restart_syscall, \ 65 }, \ 66 } 67 68 #define init_thread_info (init_thread_union.thread_info) 69 #define init_stack (init_thread_union.stack) 70 71 /* 72 * how to get the current stack pointer from C 73 */ 74 register unsigned long current_stack_pointer asm ("sp"); 75 76 /* 77 * how to get the thread information struct from C 78 */ 79 static inline struct thread_info *current_thread_info(void) __attribute_const__; 80 81 static inline struct thread_info *current_thread_info(void) 82 { 83 return (struct thread_info *) 84 (current_stack_pointer & ~(THREAD_SIZE - 1)); 85 } 86 87 #define thread_saved_pc(tsk) \ 88 ((unsigned long)(tsk->thread.cpu_context.pc)) 89 #define thread_saved_sp(tsk) \ 90 ((unsigned long)(tsk->thread.cpu_context.sp)) 91 #define thread_saved_fp(tsk) \ 92 ((unsigned long)(tsk->thread.cpu_context.fp)) 93 94 #endif 95 96 /* 97 * thread information flags: 98 * TIF_SYSCALL_TRACE - syscall trace active 99 * TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace 100 * TIF_SYSCALL_AUDIT - syscall auditing 101 * TIF_SECOMP - syscall secure computing 102 * TIF_SIGPENDING - signal pending 103 * TIF_NEED_RESCHED - rescheduling necessary 104 * TIF_NOTIFY_RESUME - callback before returning to user 105 * TIF_USEDFPU - FPU was used by this task this quantum (SMP) 106 */ 107 #define TIF_SIGPENDING 0 108 #define TIF_NEED_RESCHED 1 109 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ 110 #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */ 111 #define TIF_NOHZ 7 112 #define TIF_SYSCALL_TRACE 8 113 #define TIF_SYSCALL_AUDIT 9 114 #define TIF_SYSCALL_TRACEPOINT 10 115 #define TIF_SECCOMP 11 116 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 117 #define TIF_FREEZE 19 118 #define TIF_RESTORE_SIGMASK 20 119 #define TIF_SINGLESTEP 21 120 #define TIF_32BIT 22 /* 32bit process */ 121 #define TIF_SWITCH_MM 23 /* deferred switch_mm */ 122 123 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 124 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 125 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 126 #define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE) 127 #define _TIF_NOHZ (1 << TIF_NOHZ) 128 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 129 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 130 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 131 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 132 #define _TIF_32BIT (1 << TIF_32BIT) 133 134 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 135 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE) 136 137 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 138 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \ 139 _TIF_NOHZ) 140 141 #endif /* __KERNEL__ */ 142 #endif /* __ASM_THREAD_INFO_H */ 143