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 unsigned long previous_sp; /* sp of previous stack in case 37 of nested IRQ stacks */ 38 __u8 supervisor_stack[0]; 39 }; 40 41 #endif 42 43 #if defined(CONFIG_4KSTACKS) 44 #define THREAD_SHIFT 12 45 #else 46 #define THREAD_SHIFT 13 47 #endif 48 49 #define THREAD_SIZE (1 << THREAD_SHIFT) 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 .status = 0, \ 62 .cpu = 0, \ 63 .preempt_count = INIT_PREEMPT_COUNT, \ 64 .addr_limit = KERNEL_DS, \ 65 } 66 67 #define init_thread_info (init_thread_union.thread_info) 68 #define init_stack (init_thread_union.stack) 69 70 /* how to get the current stack pointer from C */ 71 register unsigned long current_stack_pointer asm("r15") __used; 72 73 /* how to get the thread information struct from C */ 74 static inline struct thread_info *current_thread_info(void) 75 { 76 struct thread_info *ti; 77 #if defined(CONFIG_SUPERH64) 78 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); 79 #elif defined(CONFIG_CPU_HAS_SR_RB) 80 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); 81 #else 82 unsigned long __dummy; 83 84 __asm__ __volatile__ ( 85 "mov r15, %0\n\t" 86 "and %1, %0\n\t" 87 : "=&r" (ti), "=r" (__dummy) 88 : "1" (~(THREAD_SIZE - 1)) 89 : "memory"); 90 #endif 91 92 return ti; 93 } 94 95 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 96 97 extern void arch_task_cache_init(void); 98 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 99 extern void arch_release_task_struct(struct task_struct *tsk); 100 extern void init_thread_xstate(void); 101 102 #endif /* __ASSEMBLY__ */ 103 104 /* 105 * Thread information flags 106 * 107 * - Limited to 24 bits, upper byte used for fault code encoding. 108 * 109 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or 110 * we blow the tst immediate size constraints and need to fix up 111 * arch/sh/kernel/entry-common.S. 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 /* is terminating due to OOM killer */ 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_SINGLESTEP (1 << TIF_SINGLESTEP) 128 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 129 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 130 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 131 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 132 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 133 134 /* work to do in syscall trace */ 135 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 136 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ 137 _TIF_SYSCALL_TRACEPOINT) 138 139 /* work to do on any return to u-space */ 140 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ 141 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ 142 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \ 143 _TIF_SYSCALL_TRACEPOINT) 144 145 /* work to do on interrupt/exception return */ 146 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ 147 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) 148 149 /* 150 * Thread-synchronous status. 151 * 152 * This is different from the flags in that nobody else 153 * ever touches our thread-synchronous status, so we don't 154 * have to worry about atomic accesses. 155 */ 156 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */ 157 #define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */ 158 159 #ifndef __ASSEMBLY__ 160 161 #define HAVE_SET_RESTORE_SIGMASK 1 162 static inline void set_restore_sigmask(void) 163 { 164 struct thread_info *ti = current_thread_info(); 165 ti->status |= TS_RESTORE_SIGMASK; 166 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 167 } 168 169 #define TI_FLAG_FAULT_CODE_SHIFT 24 170 171 /* 172 * Additional thread flag encoding 173 */ 174 static inline void set_thread_fault_code(unsigned int val) 175 { 176 struct thread_info *ti = current_thread_info(); 177 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT))) 178 | (val << TI_FLAG_FAULT_CODE_SHIFT); 179 } 180 181 static inline unsigned int get_thread_fault_code(void) 182 { 183 struct thread_info *ti = current_thread_info(); 184 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT; 185 } 186 187 static inline void clear_restore_sigmask(void) 188 { 189 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 190 } 191 static inline bool test_restore_sigmask(void) 192 { 193 return current_thread_info()->status & TS_RESTORE_SIGMASK; 194 } 195 static inline bool test_and_clear_restore_sigmask(void) 196 { 197 struct thread_info *ti = current_thread_info(); 198 if (!(ti->status & TS_RESTORE_SIGMASK)) 199 return false; 200 ti->status &= ~TS_RESTORE_SIGMASK; 201 return true; 202 } 203 204 #endif /* !__ASSEMBLY__ */ 205 206 #endif /* __KERNEL__ */ 207 208 #endif /* __ASM_SH_THREAD_INFO_H */ 209