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