/* thread_info.h: PowerPC low-level thread information * adapted from the i386 version by Paul Mackerras * * Copyright (C) 2002 David Howells (dhowells@redhat.com) * - Incorporating suggestions made by Linus Torvalds and Dave Miller */ #ifndef _ASM_POWERPC_THREAD_INFO_H #define _ASM_POWERPC_THREAD_INFO_H #ifdef __KERNEL__ /* We have 8k stacks on ppc32 and 16k on ppc64 */ #if defined(CONFIG_PPC64) #define THREAD_SHIFT 14 #elif defined(CONFIG_PPC_256K_PAGES) #define THREAD_SHIFT 15 #else #define THREAD_SHIFT 13 #endif #define THREAD_SIZE (1 << THREAD_SHIFT) #ifdef CONFIG_PPC64 #define CURRENT_THREAD_INFO(dest, sp) clrrdi dest, sp, THREAD_SHIFT #else #define CURRENT_THREAD_INFO(dest, sp) rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT #endif #ifndef __ASSEMBLY__ #include <linux/cache.h> #include <asm/processor.h> #include <asm/page.h> #include <linux/stringify.h> /* * low level task data. */ struct thread_info { struct task_struct *task; /* main task structure */ struct exec_domain *exec_domain; /* execution domain */ int cpu; /* cpu we're on */ int preempt_count; /* 0 => preemptable, <0 => BUG */ struct restart_block restart_block; unsigned long local_flags; /* private flags for thread */ /* low level flags - has atomic operations done on it */ unsigned long flags ____cacheline_aligned_in_smp; }; /* * macros/functions for gaining access to the thread information structure */ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .exec_domain = &default_exec_domain, \ .cpu = 0, \ .preempt_count = INIT_PREEMPT_COUNT, \ .restart_block = { \ .fn = do_no_restart_syscall, \ }, \ .flags = 0, \ } #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) /* how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) { register unsigned long sp asm("r1"); /* gcc4, at least, is smart enough to turn this into a single * rlwinm for ppc32 and clrrdi for ppc64 */ return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); } #endif /* __ASSEMBLY__ */ /* * thread information flag bit numbers */ #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_SIGPENDING 1 /* signal pending */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_32BIT 4 /* 32 bit binary */ #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ #define TIF_SINGLESTEP 8 /* singlestepping active */ #define TIF_NOHZ 9 /* in adaptive nohz mode */ #define TIF_SECCOMP 10 /* secure computing */ #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ #define TIF_NOERROR 12 /* Force successful syscall return */ #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ #define TIF_UPROBE 14 /* breakpointed or single-stepping */ #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation for stack store? */ #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ #if defined(CONFIG_PPC64) #define TIF_ELF2ABI 18 /* function descriptors must die! */ #endif /* as above, but as bit values */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) #define _TIF_32BIT (1<<TIF_32BIT) #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) #define _TIF_SECCOMP (1<<TIF_SECCOMP) #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) #define _TIF_NOERROR (1<<TIF_NOERROR) #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) #define _TIF_UPROBE (1<<TIF_UPROBE) #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) #define _TIF_NOHZ (1<<TIF_NOHZ) #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ _TIF_NOHZ) #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ _TIF_RESTORE_TM) #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) /* Bits in local_flags */ /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ #define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */ #define TLF_LAZY_MMU 3 /* tlb_batch is active */ #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ #define _TLF_NAPPING (1 << TLF_NAPPING) #define _TLF_SLEEPING (1 << TLF_SLEEPING) #define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK) #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) #ifndef __ASSEMBLY__ #define HAVE_SET_RESTORE_SIGMASK 1 static inline void set_restore_sigmask(void) { struct thread_info *ti = current_thread_info(); ti->local_flags |= _TLF_RESTORE_SIGMASK; WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags)); } static inline void clear_restore_sigmask(void) { current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK; } static inline bool test_restore_sigmask(void) { return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK; } static inline bool test_and_clear_restore_sigmask(void) { struct thread_info *ti = current_thread_info(); if (!(ti->local_flags & _TLF_RESTORE_SIGMASK)) return false; ti->local_flags &= ~_TLF_RESTORE_SIGMASK; return true; } static inline bool test_thread_local_flags(unsigned int flags) { struct thread_info *ti = current_thread_info(); return (ti->local_flags & flags) != 0; } #ifdef CONFIG_PPC64 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) #else #define is_32bit_task() (1) #endif #if defined(CONFIG_PPC64) #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) #else #define is_elf2_task() (0) #endif #endif /* !__ASSEMBLY__ */ #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_THREAD_INFO_H */