1 #ifndef __ASM_SH_THREAD_INFO_H 2 #define __ASM_SH_THREAD_INFO_H 3 4 /* SuperH version 5 * Copyright (C) 2002 Niibe Yutaka 6 * 7 * The copyright of original i386 version is: 8 * 9 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 10 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 11 */ 12 #ifdef __KERNEL__ 13 14 #include <asm/page.h> 15 16 /* 17 * Page fault error code bits 18 */ 19 #define FAULT_CODE_WRITE (1 << 0) /* write access */ 20 #define FAULT_CODE_INITIAL (1 << 1) /* initial page write */ 21 #define FAULT_CODE_ITLB (1 << 2) /* ITLB miss */ 22 #define FAULT_CODE_PROT (1 << 3) /* protection fault */ 23 #define FAULT_CODE_USER (1 << 4) /* user-mode access */ 24 25 #ifndef __ASSEMBLY__ 26 #include <asm/processor.h> 27 28 struct thread_info { 29 struct task_struct *task; /* main task structure */ 30 unsigned long flags; /* low level flags */ 31 __u32 status; /* thread synchronous flags */ 32 __u32 cpu; 33 int preempt_count; /* 0 => preemptable, <0 => BUG */ 34 mm_segment_t addr_limit; /* thread address space */ 35 unsigned long previous_sp; /* sp of previous stack in case 36 of nested IRQ stacks */ 37 __u8 supervisor_stack[0]; 38 }; 39 40 #endif 41 42 #if defined(CONFIG_4KSTACKS) 43 #define THREAD_SHIFT 12 44 #else 45 #define THREAD_SHIFT 13 46 #endif 47 48 #define THREAD_SIZE (1 << THREAD_SHIFT) 49 #define STACK_WARN (THREAD_SIZE >> 3) 50 51 /* 52 * macros/functions for gaining access to the thread information structure 53 */ 54 #ifndef __ASSEMBLY__ 55 #define INIT_THREAD_INFO(tsk) \ 56 { \ 57 .task = &tsk, \ 58 .flags = 0, \ 59 .status = 0, \ 60 .cpu = 0, \ 61 .preempt_count = INIT_PREEMPT_COUNT, \ 62 .addr_limit = KERNEL_DS, \ 63 } 64 65 #define init_thread_info (init_thread_union.thread_info) 66 #define init_stack (init_thread_union.stack) 67 68 /* how to get the current stack pointer from C */ 69 register unsigned long current_stack_pointer asm("r15") __used; 70 71 /* how to get the thread information struct from C */ 72 static inline struct thread_info *current_thread_info(void) 73 { 74 struct thread_info *ti; 75 #if defined(CONFIG_SUPERH64) 76 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); 77 #elif defined(CONFIG_CPU_HAS_SR_RB) 78 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); 79 #else 80 unsigned long __dummy; 81 82 __asm__ __volatile__ ( 83 "mov r15, %0\n\t" 84 "and %1, %0\n\t" 85 : "=&r" (ti), "=r" (__dummy) 86 : "1" (~(THREAD_SIZE - 1)) 87 : "memory"); 88 #endif 89 90 return ti; 91 } 92 93 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 94 95 extern void arch_task_cache_init(void); 96 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 97 extern void arch_release_task_struct(struct task_struct *tsk); 98 extern void init_thread_xstate(void); 99 100 #endif /* __ASSEMBLY__ */ 101 102 /* 103 * Thread information flags 104 * 105 * - Limited to 24 bits, upper byte used for fault code encoding. 106 * 107 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or 108 * we blow the tst immediate size constraints and need to fix up 109 * arch/sh/kernel/entry-common.S. 110 */ 111 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 112 #define TIF_SIGPENDING 1 /* signal pending */ 113 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 114 #define TIF_SINGLESTEP 4 /* singlestepping active */ 115 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 116 #define TIF_SECCOMP 6 /* secure computing */ 117 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ 118 #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ 119 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 120 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 121 122 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 123 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 124 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 125 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 126 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 127 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 128 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 129 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 130 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 131 132 /* work to do in syscall trace */ 133 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 134 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ 135 _TIF_SYSCALL_TRACEPOINT) 136 137 /* work to do on any return to u-space */ 138 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ 139 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ 140 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \ 141 _TIF_SYSCALL_TRACEPOINT) 142 143 /* work to do on interrupt/exception return */ 144 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ 145 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) 146 147 /* 148 * Thread-synchronous status. 149 * 150 * This is different from the flags in that nobody else 151 * ever touches our thread-synchronous status, so we don't 152 * have to worry about atomic accesses. 153 */ 154 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */ 155 #define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */ 156 157 #ifndef __ASSEMBLY__ 158 159 #define HAVE_SET_RESTORE_SIGMASK 1 160 static inline void set_restore_sigmask(void) 161 { 162 struct thread_info *ti = current_thread_info(); 163 ti->status |= TS_RESTORE_SIGMASK; 164 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 165 } 166 167 #define TI_FLAG_FAULT_CODE_SHIFT 24 168 169 /* 170 * Additional thread flag encoding 171 */ 172 static inline void set_thread_fault_code(unsigned int val) 173 { 174 struct thread_info *ti = current_thread_info(); 175 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT))) 176 | (val << TI_FLAG_FAULT_CODE_SHIFT); 177 } 178 179 static inline unsigned int get_thread_fault_code(void) 180 { 181 struct thread_info *ti = current_thread_info(); 182 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT; 183 } 184 185 static inline void clear_restore_sigmask(void) 186 { 187 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 188 } 189 static inline bool test_restore_sigmask(void) 190 { 191 return current_thread_info()->status & TS_RESTORE_SIGMASK; 192 } 193 static inline bool test_and_clear_restore_sigmask(void) 194 { 195 struct thread_info *ti = current_thread_info(); 196 if (!(ti->status & TS_RESTORE_SIGMASK)) 197 return false; 198 ti->status &= ~TS_RESTORE_SIGMASK; 199 return true; 200 } 201 202 #endif /* !__ASSEMBLY__ */ 203 204 #endif /* __KERNEL__ */ 205 206 #endif /* __ASM_SH_THREAD_INFO_H */ 207