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 28struct thread_info { 29 struct task_struct *task; /* main task structure */ 30 unsigned long flags; /* low level flags */ 31 __u32 status; /* thread synchronous flags */ 32 __u32 cpu; 33 int preempt_count; /* 0 => preemptable, <0 => BUG */ 34 mm_segment_t addr_limit; /* thread address space */ 35 unsigned long previous_sp; /* sp of previous stack in case 36 of nested IRQ stacks */ 37 __u8 supervisor_stack[0]; 38}; 39 40#endif 41 42#if defined(CONFIG_4KSTACKS) 43#define THREAD_SHIFT 12 44#else 45#define THREAD_SHIFT 13 46#endif 47 48#define THREAD_SIZE (1 << THREAD_SHIFT) 49#define STACK_WARN (THREAD_SIZE >> 3) 50 51/* 52 * macros/functions for gaining access to the thread information structure 53 */ 54#ifndef __ASSEMBLY__ 55#define INIT_THREAD_INFO(tsk) \ 56{ \ 57 .task = &tsk, \ 58 .flags = 0, \ 59 .status = 0, \ 60 .cpu = 0, \ 61 .preempt_count = INIT_PREEMPT_COUNT, \ 62 .addr_limit = KERNEL_DS, \ 63} 64 65#define init_thread_info (init_thread_union.thread_info) 66#define init_stack (init_thread_union.stack) 67 68/* how to get the current stack pointer from C */ 69register unsigned long current_stack_pointer asm("r15") __used; 70 71/* how to get the thread information struct from C */ 72static inline struct thread_info *current_thread_info(void) 73{ 74 struct thread_info *ti; 75#if defined(CONFIG_SUPERH64) 76 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); 77#elif defined(CONFIG_CPU_HAS_SR_RB) 78 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); 79#else 80 unsigned long __dummy; 81 82 __asm__ __volatile__ ( 83 "mov r15, %0\n\t" 84 "and %1, %0\n\t" 85 : "=&r" (ti), "=r" (__dummy) 86 : "1" (~(THREAD_SIZE - 1)) 87 : "memory"); 88#endif 89 90 return ti; 91} 92 93#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 94 95extern void arch_task_cache_init(void); 96extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 97extern void arch_release_task_struct(struct task_struct *tsk); 98extern void init_thread_xstate(void); 99 100#endif /* __ASSEMBLY__ */ 101 102/* 103 * Thread information flags 104 * 105 * - Limited to 24 bits, upper byte used for fault code encoding. 106 * 107 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or 108 * we blow the tst immediate size constraints and need to fix up 109 * arch/sh/kernel/entry-common.S. 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_SINGLESTEP 4 /* singlestepping active */ 115#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 116#define TIF_SECCOMP 6 /* secure computing */ 117#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ 118#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ 119#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 120#define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 121 122#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 123#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 124#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 125#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 126#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 127#define _TIF_SECCOMP (1 << TIF_SECCOMP) 128#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 129#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 130#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 131 132/* work to do in syscall trace */ 133#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 134 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ 135 _TIF_SYSCALL_TRACEPOINT) 136 137/* work to do on any return to u-space */ 138#define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ 139 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ 140 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \ 141 _TIF_SYSCALL_TRACEPOINT) 142 143/* work to do on interrupt/exception return */ 144#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ 145 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) 146 147/* 148 * Thread-synchronous status. 149 * 150 * This is different from the flags in that nobody else 151 * ever touches our thread-synchronous status, so we don't 152 * have to worry about atomic accesses. 153 */ 154#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */ 155#define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */ 156 157#ifndef __ASSEMBLY__ 158 159#define HAVE_SET_RESTORE_SIGMASK 1 160static inline void set_restore_sigmask(void) 161{ 162 struct thread_info *ti = current_thread_info(); 163 ti->status |= TS_RESTORE_SIGMASK; 164 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 165} 166 167#define TI_FLAG_FAULT_CODE_SHIFT 24 168 169/* 170 * Additional thread flag encoding 171 */ 172static inline void set_thread_fault_code(unsigned int val) 173{ 174 struct thread_info *ti = current_thread_info(); 175 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT))) 176 | (val << TI_FLAG_FAULT_CODE_SHIFT); 177} 178 179static inline unsigned int get_thread_fault_code(void) 180{ 181 struct thread_info *ti = current_thread_info(); 182 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT; 183} 184 185static inline void clear_restore_sigmask(void) 186{ 187 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 188} 189static inline bool test_restore_sigmask(void) 190{ 191 return current_thread_info()->status & TS_RESTORE_SIGMASK; 192} 193static inline bool test_and_clear_restore_sigmask(void) 194{ 195 struct thread_info *ti = current_thread_info(); 196 if (!(ti->status & TS_RESTORE_SIGMASK)) 197 return false; 198 ti->status &= ~TS_RESTORE_SIGMASK; 199 return true; 200} 201 202#endif /* !__ASSEMBLY__ */ 203 204#endif /* __KERNEL__ */ 205 206#endif /* __ASM_SH_THREAD_INFO_H */ 207