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 #include <asm/page.h> 14 15 #ifndef __ASSEMBLY__ 16 #include <asm/processor.h> 17 18 struct thread_info { 19 struct task_struct *task; /* main task structure */ 20 struct exec_domain *exec_domain; /* execution domain */ 21 unsigned long flags; /* low level flags */ 22 __u32 status; /* thread synchronous flags */ 23 __u32 cpu; 24 int preempt_count; /* 0 => preemptable, <0 => BUG */ 25 mm_segment_t addr_limit; /* thread address space */ 26 struct restart_block restart_block; 27 unsigned long previous_sp; /* sp of previous stack in case 28 of nested IRQ stacks */ 29 __u8 supervisor_stack[0]; 30 }; 31 32 #endif 33 34 #define PREEMPT_ACTIVE 0x10000000 35 36 #if defined(CONFIG_4KSTACKS) 37 #define THREAD_SHIFT 12 38 #else 39 #define THREAD_SHIFT 13 40 #endif 41 42 #define THREAD_SIZE (1 << THREAD_SHIFT) 43 #define STACK_WARN (THREAD_SIZE >> 3) 44 45 /* 46 * macros/functions for gaining access to the thread information structure 47 */ 48 #ifndef __ASSEMBLY__ 49 #define INIT_THREAD_INFO(tsk) \ 50 { \ 51 .task = &tsk, \ 52 .exec_domain = &default_exec_domain, \ 53 .flags = 0, \ 54 .status = 0, \ 55 .cpu = 0, \ 56 .preempt_count = INIT_PREEMPT_COUNT, \ 57 .addr_limit = KERNEL_DS, \ 58 .restart_block = { \ 59 .fn = do_no_restart_syscall, \ 60 }, \ 61 } 62 63 #define init_thread_info (init_thread_union.thread_info) 64 #define init_stack (init_thread_union.stack) 65 66 /* how to get the current stack pointer from C */ 67 register unsigned long current_stack_pointer asm("r15") __used; 68 69 /* how to get the thread information struct from C */ 70 static inline struct thread_info *current_thread_info(void) 71 { 72 struct thread_info *ti; 73 #if defined(CONFIG_SUPERH64) 74 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); 75 #elif defined(CONFIG_CPU_HAS_SR_RB) 76 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); 77 #else 78 unsigned long __dummy; 79 80 __asm__ __volatile__ ( 81 "mov r15, %0\n\t" 82 "and %1, %0\n\t" 83 : "=&r" (ti), "=r" (__dummy) 84 : "1" (~(THREAD_SIZE - 1)) 85 : "memory"); 86 #endif 87 88 return ti; 89 } 90 91 /* thread information allocation */ 92 #if THREAD_SHIFT >= PAGE_SHIFT 93 94 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 95 96 #else /* THREAD_SHIFT < PAGE_SHIFT */ 97 98 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 99 100 extern struct thread_info *alloc_thread_info(struct task_struct *tsk); 101 extern void free_thread_info(struct thread_info *ti); 102 103 #endif /* THREAD_SHIFT < PAGE_SHIFT */ 104 105 #endif /* __ASSEMBLY__ */ 106 107 /* 108 * thread information flags 109 * - these are process state flags that various assembly files may need to access 110 * - pending work-to-be-done flags are in LSW 111 * - other flags in MSW 112 */ 113 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 114 #define TIF_SIGPENDING 1 /* signal pending */ 115 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 116 #define TIF_SINGLESTEP 4 /* singlestepping active */ 117 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 118 #define TIF_SECCOMP 6 /* secure computing */ 119 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ 120 #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ 121 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 122 #define TIF_MEMDIE 18 123 #define TIF_FREEZE 19 /* Freezing for suspend */ 124 125 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 126 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 127 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 128 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 129 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 130 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 131 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 132 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 133 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 134 #define _TIF_FREEZE (1 << TIF_FREEZE) 135 136 /* 137 * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or we 138 * blow the tst immediate size constraints and need to fix up 139 * arch/sh/kernel/entry-common.S. 140 */ 141 142 /* work to do in syscall trace */ 143 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 144 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ 145 _TIF_SYSCALL_TRACEPOINT) 146 147 /* work to do on any return to u-space */ 148 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ 149 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ 150 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \ 151 _TIF_SYSCALL_TRACEPOINT) 152 153 /* work to do on interrupt/exception return */ 154 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ 155 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) 156 157 /* 158 * Thread-synchronous status. 159 * 160 * This is different from the flags in that nobody else 161 * ever touches our thread-synchronous status, so we don't 162 * have to worry about atomic accesses. 163 */ 164 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */ 165 #define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */ 166 167 #ifndef __ASSEMBLY__ 168 #define HAVE_SET_RESTORE_SIGMASK 1 169 static inline void set_restore_sigmask(void) 170 { 171 struct thread_info *ti = current_thread_info(); 172 ti->status |= TS_RESTORE_SIGMASK; 173 set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags); 174 } 175 #endif /* !__ASSEMBLY__ */ 176 177 #endif /* __KERNEL__ */ 178 179 #endif /* __ASM_SH_THREAD_INFO_H */ 180