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_SIZE_ORDER (0) 37 #elif defined(CONFIG_PAGE_SIZE_4KB) 38 #define THREAD_SIZE_ORDER (1) 39 #elif defined(CONFIG_PAGE_SIZE_8KB) 40 #define THREAD_SIZE_ORDER (1) 41 #elif defined(CONFIG_PAGE_SIZE_16KB) 42 #define THREAD_SIZE_ORDER (0) 43 #elif defined(CONFIG_PAGE_SIZE_64KB) 44 #define THREAD_SIZE_ORDER (0) 45 #else 46 #error "Unknown thread size" 47 #endif 48 49 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 50 #define STACK_WARN (THREAD_SIZE >> 3) 51 52 /* 53 * macros/functions for gaining access to the thread information structure 54 */ 55 #ifndef __ASSEMBLY__ 56 #define INIT_THREAD_INFO(tsk) \ 57 { \ 58 .task = &tsk, \ 59 .exec_domain = &default_exec_domain, \ 60 .flags = 0, \ 61 .cpu = 0, \ 62 .preempt_count = 1, \ 63 .addr_limit = KERNEL_DS, \ 64 .restart_block = { \ 65 .fn = do_no_restart_syscall, \ 66 }, \ 67 } 68 69 #define init_thread_info (init_thread_union.thread_info) 70 #define init_stack (init_thread_union.stack) 71 72 /* how to get the current stack pointer from C */ 73 register unsigned long current_stack_pointer asm("r15") __used; 74 75 /* how to get the thread information struct from C */ 76 static inline struct thread_info *current_thread_info(void) 77 { 78 struct thread_info *ti; 79 #if defined(CONFIG_SUPERH64) 80 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); 81 #elif defined(CONFIG_CPU_HAS_SR_RB) 82 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); 83 #else 84 unsigned long __dummy; 85 86 __asm__ __volatile__ ( 87 "mov r15, %0\n\t" 88 "and %1, %0\n\t" 89 : "=&r" (ti), "=r" (__dummy) 90 : "1" (~(THREAD_SIZE - 1)) 91 : "memory"); 92 #endif 93 94 return ti; 95 } 96 97 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 98 99 /* thread information allocation */ 100 #ifdef CONFIG_DEBUG_STACK_USAGE 101 #define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL) 102 #else 103 #define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL) 104 #endif 105 #define free_thread_info(ti) kfree(ti) 106 107 #endif /* __ASSEMBLY__ */ 108 109 /* 110 * thread information flags 111 * - these are process state flags that various assembly files may need to access 112 * - pending work-to-be-done flags are in LSW 113 * - other flags in MSW 114 */ 115 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 116 #define TIF_SIGPENDING 1 /* signal pending */ 117 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 118 #define TIF_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */ 119 #define TIF_SINGLESTEP 4 /* singlestepping active */ 120 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 121 #define TIF_SECCOMP 6 /* secure computing */ 122 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ 123 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 124 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 125 #define TIF_MEMDIE 18 126 #define TIF_FREEZE 19 /* Freezing for suspend */ 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_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) 132 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 133 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 134 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 135 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 136 #define _TIF_USEDFPU (1 << TIF_USEDFPU) 137 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 138 #define _TIF_FREEZE (1 << TIF_FREEZE) 139 140 /* 141 * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within a byte, or we 142 * blow the tst immediate size constraints and need to fix up 143 * arch/sh/kernel/entry-common.S. 144 */ 145 146 /* work to do in syscall trace */ 147 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 148 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) 149 150 /* work to do on any return to u-space */ 151 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ 152 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ 153 _TIF_SINGLESTEP | _TIF_RESTORE_SIGMASK | \ 154 _TIF_NOTIFY_RESUME) 155 156 /* work to do on interrupt/exception return */ 157 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ 158 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) 159 160 #endif /* __KERNEL__ */ 161 162 #endif /* __ASM_SH_THREAD_INFO_H */ 163