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 struct exec_domain *exec_domain; /* execution domain */ 31 unsigned long flags; /* low level flags */ 32 __u32 status; /* thread synchronous flags */ 33 __u32 cpu; 34 int preempt_count; /* 0 => preemptable, <0 => BUG */ 35 mm_segment_t addr_limit; /* thread address space */ 36 struct restart_block restart_block; 37 unsigned long previous_sp; /* sp of previous stack in case 38 of nested IRQ stacks */ 39 __u8 supervisor_stack[0]; 40 }; 41 42 #endif 43 44 #define PREEMPT_ACTIVE 0x10000000 45 46 #if defined(CONFIG_4KSTACKS) 47 #define THREAD_SHIFT 12 48 #else 49 #define THREAD_SHIFT 13 50 #endif 51 52 #define THREAD_SIZE (1 << THREAD_SHIFT) 53 #define STACK_WARN (THREAD_SIZE >> 3) 54 55 /* 56 * macros/functions for gaining access to the thread information structure 57 */ 58 #ifndef __ASSEMBLY__ 59 #define INIT_THREAD_INFO(tsk) \ 60 { \ 61 .task = &tsk, \ 62 .exec_domain = &default_exec_domain, \ 63 .flags = 0, \ 64 .status = 0, \ 65 .cpu = 0, \ 66 .preempt_count = INIT_PREEMPT_COUNT, \ 67 .addr_limit = KERNEL_DS, \ 68 .restart_block = { \ 69 .fn = do_no_restart_syscall, \ 70 }, \ 71 } 72 73 #define init_thread_info (init_thread_union.thread_info) 74 #define init_stack (init_thread_union.stack) 75 76 /* how to get the current stack pointer from C */ 77 register unsigned long current_stack_pointer asm("r15") __used; 78 79 /* how to get the thread information struct from C */ 80 static inline struct thread_info *current_thread_info(void) 81 { 82 struct thread_info *ti; 83 #if defined(CONFIG_SUPERH64) 84 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); 85 #elif defined(CONFIG_CPU_HAS_SR_RB) 86 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); 87 #else 88 unsigned long __dummy; 89 90 __asm__ __volatile__ ( 91 "mov r15, %0\n\t" 92 "and %1, %0\n\t" 93 : "=&r" (ti), "=r" (__dummy) 94 : "1" (~(THREAD_SIZE - 1)) 95 : "memory"); 96 #endif 97 98 return ti; 99 } 100 101 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 102 103 extern void arch_task_cache_init(void); 104 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 105 extern void arch_release_task_struct(struct task_struct *tsk); 106 extern void init_thread_xstate(void); 107 108 #endif /* __ASSEMBLY__ */ 109 110 /* 111 * Thread information flags 112 * 113 * - Limited to 24 bits, upper byte used for fault code encoding. 114 * 115 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or 116 * we blow the tst immediate size constraints and need to fix up 117 * arch/sh/kernel/entry-common.S. 118 */ 119 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 120 #define TIF_SIGPENDING 1 /* signal pending */ 121 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 122 #define TIF_SINGLESTEP 4 /* singlestepping active */ 123 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 124 #define TIF_SECCOMP 6 /* secure computing */ 125 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ 126 #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ 127 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 128 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 129 130 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 131 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 132 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 133 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 134 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 135 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 136 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 137 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 138 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 139 140 /* work to do in syscall trace */ 141 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 142 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ 143 _TIF_SYSCALL_TRACEPOINT) 144 145 /* work to do on any return to u-space */ 146 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ 147 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ 148 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \ 149 _TIF_SYSCALL_TRACEPOINT) 150 151 /* work to do on interrupt/exception return */ 152 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ 153 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) 154 155 /* 156 * Thread-synchronous status. 157 * 158 * This is different from the flags in that nobody else 159 * ever touches our thread-synchronous status, so we don't 160 * have to worry about atomic accesses. 161 */ 162 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */ 163 #define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */ 164 165 #ifndef __ASSEMBLY__ 166 167 #define HAVE_SET_RESTORE_SIGMASK 1 168 static inline void set_restore_sigmask(void) 169 { 170 struct thread_info *ti = current_thread_info(); 171 ti->status |= TS_RESTORE_SIGMASK; 172 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 173 } 174 175 #define TI_FLAG_FAULT_CODE_SHIFT 24 176 177 /* 178 * Additional thread flag encoding 179 */ 180 static inline void set_thread_fault_code(unsigned int val) 181 { 182 struct thread_info *ti = current_thread_info(); 183 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT))) 184 | (val << TI_FLAG_FAULT_CODE_SHIFT); 185 } 186 187 static inline unsigned int get_thread_fault_code(void) 188 { 189 struct thread_info *ti = current_thread_info(); 190 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT; 191 } 192 193 static inline void clear_restore_sigmask(void) 194 { 195 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 196 } 197 static inline bool test_restore_sigmask(void) 198 { 199 return current_thread_info()->status & TS_RESTORE_SIGMASK; 200 } 201 static inline bool test_and_clear_restore_sigmask(void) 202 { 203 struct thread_info *ti = current_thread_info(); 204 if (!(ti->status & TS_RESTORE_SIGMASK)) 205 return false; 206 ti->status &= ~TS_RESTORE_SIGMASK; 207 return true; 208 } 209 210 #define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG) 211 212 #endif /* !__ASSEMBLY__ */ 213 214 #endif /* __KERNEL__ */ 215 216 #endif /* __ASM_SH_THREAD_INFO_H */ 217