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 cpu; 23 int preempt_count; /* 0 => preemptable, <0 => BUG */ 24 mm_segment_t addr_limit; /* thread address space */ 25 struct restart_block restart_block; 26 unsigned long previous_sp; /* sp of previous stack in case 27 of nested IRQ stacks */ 28 __u8 supervisor_stack[0]; 29 }; 30 31 #endif 32 33 #define PREEMPT_ACTIVE 0x10000000 34 35 #if defined(CONFIG_4KSTACKS) 36 #define THREAD_SHIFT 12 37 #else 38 #define THREAD_SHIFT 13 39 #endif 40 41 #define THREAD_SIZE (1 << THREAD_SHIFT) 42 #define STACK_WARN (THREAD_SIZE >> 3) 43 44 /* 45 * macros/functions for gaining access to the thread information structure 46 */ 47 #ifndef __ASSEMBLY__ 48 #define INIT_THREAD_INFO(tsk) \ 49 { \ 50 .task = &tsk, \ 51 .exec_domain = &default_exec_domain, \ 52 .flags = 0, \ 53 .cpu = 0, \ 54 .preempt_count = 1, \ 55 .addr_limit = KERNEL_DS, \ 56 .restart_block = { \ 57 .fn = do_no_restart_syscall, \ 58 }, \ 59 } 60 61 #define init_thread_info (init_thread_union.thread_info) 62 #define init_stack (init_thread_union.stack) 63 64 /* how to get the current stack pointer from C */ 65 register unsigned long current_stack_pointer asm("r15") __used; 66 67 /* how to get the thread information struct from C */ 68 static inline struct thread_info *current_thread_info(void) 69 { 70 struct thread_info *ti; 71 #if defined(CONFIG_SUPERH64) 72 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); 73 #elif defined(CONFIG_CPU_HAS_SR_RB) 74 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); 75 #else 76 unsigned long __dummy; 77 78 __asm__ __volatile__ ( 79 "mov r15, %0\n\t" 80 "and %1, %0\n\t" 81 : "=&r" (ti), "=r" (__dummy) 82 : "1" (~(THREAD_SIZE - 1)) 83 : "memory"); 84 #endif 85 86 return ti; 87 } 88 89 /* thread information allocation */ 90 #if THREAD_SHIFT >= PAGE_SHIFT 91 92 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 93 94 #else /* THREAD_SHIFT < PAGE_SHIFT */ 95 96 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 97 98 extern struct thread_info *alloc_thread_info(struct task_struct *tsk); 99 extern void free_thread_info(struct thread_info *ti); 100 101 #endif /* THREAD_SHIFT < PAGE_SHIFT */ 102 103 #endif /* __ASSEMBLY__ */ 104 105 /* 106 * thread information flags 107 * - these are process state flags that various assembly files may need to access 108 * - pending work-to-be-done flags are in LSW 109 * - other flags in MSW 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_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */ 115 #define TIF_SINGLESTEP 4 /* singlestepping active */ 116 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 117 #define TIF_SECCOMP 6 /* secure computing */ 118 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ 119 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 120 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 121 #define TIF_MEMDIE 18 122 #define TIF_FREEZE 19 /* Freezing for suspend */ 123 124 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 125 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 126 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 127 #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) 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_USEDFPU (1 << TIF_USEDFPU) 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 a byte, 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) 145 146 /* work to do on any return to u-space */ 147 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ 148 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ 149 _TIF_SINGLESTEP | _TIF_RESTORE_SIGMASK | \ 150 _TIF_NOTIFY_RESUME) 151 152 /* work to do on interrupt/exception return */ 153 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ 154 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) 155 156 #endif /* __KERNEL__ */ 157 158 #endif /* __ASM_SH_THREAD_INFO_H */ 159