1/* thread_info.h: PowerPC low-level thread information 2 * adapted from the i386 version by Paul Mackerras 3 * 4 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 6 */ 7 8#ifndef _ASM_POWERPC_THREAD_INFO_H 9#define _ASM_POWERPC_THREAD_INFO_H 10 11#ifdef __KERNEL__ 12 13/* We have 8k stacks on ppc32 and 16k on ppc64 */ 14 15#if defined(CONFIG_PPC64) 16#define THREAD_SHIFT 14 17#elif defined(CONFIG_PPC_256K_PAGES) 18#define THREAD_SHIFT 15 19#else 20#define THREAD_SHIFT 13 21#endif 22 23#define THREAD_SIZE (1 << THREAD_SHIFT) 24 25#ifdef CONFIG_PPC64 26#define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(clrrdi dest, sp, THREAD_SHIFT) 27#else 28#define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT) 29#endif 30 31#ifndef __ASSEMBLY__ 32#include <linux/cache.h> 33#include <asm/processor.h> 34#include <asm/page.h> 35#include <linux/stringify.h> 36 37/* 38 * low level task data. 39 */ 40struct thread_info { 41 struct task_struct *task; /* main task structure */ 42 int cpu; /* cpu we're on */ 43 int preempt_count; /* 0 => preemptable, 44 <0 => BUG */ 45 unsigned long local_flags; /* private flags for thread */ 46 47 /* low level flags - has atomic operations done on it */ 48 unsigned long flags ____cacheline_aligned_in_smp; 49}; 50 51/* 52 * macros/functions for gaining access to the thread information structure 53 */ 54#define INIT_THREAD_INFO(tsk) \ 55{ \ 56 .task = &tsk, \ 57 .cpu = 0, \ 58 .preempt_count = INIT_PREEMPT_COUNT, \ 59 .flags = 0, \ 60} 61 62#define init_thread_info (init_thread_union.thread_info) 63#define init_stack (init_thread_union.stack) 64 65#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 66 67/* how to get the thread information struct from C */ 68static inline struct thread_info *current_thread_info(void) 69{ 70 unsigned long val; 71 72 asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val)); 73 74 return (struct thread_info *)val; 75} 76 77#endif /* __ASSEMBLY__ */ 78 79/* 80 * thread information flag bit numbers 81 */ 82#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 83#define TIF_SIGPENDING 1 /* signal pending */ 84#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 85#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 86 TIF_NEED_RESCHED */ 87#define TIF_32BIT 4 /* 32 bit binary */ 88#define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ 89#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 90#define TIF_SINGLESTEP 8 /* singlestepping active */ 91#define TIF_NOHZ 9 /* in adaptive nohz mode */ 92#define TIF_SECCOMP 10 /* secure computing */ 93#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 94#define TIF_NOERROR 12 /* Force successful syscall return */ 95#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 96#define TIF_UPROBE 14 /* breakpointed or single-stepping */ 97#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ 98#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation 99 for stack store? */ 100#define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 101#if defined(CONFIG_PPC64) 102#define TIF_ELF2ABI 18 /* function descriptors must die! */ 103#endif 104 105/* as above, but as bit values */ 106#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 107#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 108#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 109#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 110#define _TIF_32BIT (1<<TIF_32BIT) 111#define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) 112#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 113#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 114#define _TIF_SECCOMP (1<<TIF_SECCOMP) 115#define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 116#define _TIF_NOERROR (1<<TIF_NOERROR) 117#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 118#define _TIF_UPROBE (1<<TIF_UPROBE) 119#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 120#define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) 121#define _TIF_NOHZ (1<<TIF_NOHZ) 122#define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 123 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ 124 _TIF_NOHZ) 125 126#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 127 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ 128 _TIF_RESTORE_TM) 129#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 130 131/* Bits in local_flags */ 132/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 133#define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 134#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 135#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */ 136#define TLF_LAZY_MMU 3 /* tlb_batch is active */ 137#define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ 138 139#define _TLF_NAPPING (1 << TLF_NAPPING) 140#define _TLF_SLEEPING (1 << TLF_SLEEPING) 141#define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK) 142#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) 143#define _TLF_RUNLATCH (1 << TLF_RUNLATCH) 144 145#ifndef __ASSEMBLY__ 146#define HAVE_SET_RESTORE_SIGMASK 1 147static inline void set_restore_sigmask(void) 148{ 149 struct thread_info *ti = current_thread_info(); 150 ti->local_flags |= _TLF_RESTORE_SIGMASK; 151 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags)); 152} 153static inline void clear_restore_sigmask(void) 154{ 155 current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK; 156} 157static inline bool test_restore_sigmask(void) 158{ 159 return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK; 160} 161static inline bool test_and_clear_restore_sigmask(void) 162{ 163 struct thread_info *ti = current_thread_info(); 164 if (!(ti->local_flags & _TLF_RESTORE_SIGMASK)) 165 return false; 166 ti->local_flags &= ~_TLF_RESTORE_SIGMASK; 167 return true; 168} 169 170static inline bool test_thread_local_flags(unsigned int flags) 171{ 172 struct thread_info *ti = current_thread_info(); 173 return (ti->local_flags & flags) != 0; 174} 175 176#ifdef CONFIG_PPC64 177#define is_32bit_task() (test_thread_flag(TIF_32BIT)) 178#else 179#define is_32bit_task() (1) 180#endif 181 182#if defined(CONFIG_PPC64) 183#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) 184#else 185#define is_elf2_task() (0) 186#endif 187 188#endif /* !__ASSEMBLY__ */ 189 190#endif /* __KERNEL__ */ 191 192#endif /* _ASM_POWERPC_THREAD_INFO_H */ 193