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) clrrdi dest, sp, THREAD_SHIFT 27 #else 28 #define CURRENT_THREAD_INFO(dest, sp) 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 */ 40 struct thread_info { 41 struct task_struct *task; /* main task structure */ 42 struct exec_domain *exec_domain; /* execution domain */ 43 int cpu; /* cpu we're on */ 44 int preempt_count; /* 0 => preemptable, 45 <0 => BUG */ 46 struct restart_block restart_block; 47 unsigned long local_flags; /* private flags for thread */ 48 49 /* low level flags - has atomic operations done on it */ 50 unsigned long flags ____cacheline_aligned_in_smp; 51 }; 52 53 /* 54 * macros/functions for gaining access to the thread information structure 55 */ 56 #define INIT_THREAD_INFO(tsk) \ 57 { \ 58 .task = &tsk, \ 59 .exec_domain = &default_exec_domain, \ 60 .cpu = 0, \ 61 .preempt_count = INIT_PREEMPT_COUNT, \ 62 .restart_block = { \ 63 .fn = do_no_restart_syscall, \ 64 }, \ 65 .flags = 0, \ 66 } 67 68 #define init_thread_info (init_thread_union.thread_info) 69 #define init_stack (init_thread_union.stack) 70 71 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 72 73 /* how to get the thread information struct from C */ 74 static inline struct thread_info *current_thread_info(void) 75 { 76 register unsigned long sp asm("r1"); 77 78 /* gcc4, at least, is smart enough to turn this into a single 79 * rlwinm for ppc32 and clrrdi for ppc64 */ 80 return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); 81 } 82 83 #endif /* __ASSEMBLY__ */ 84 85 #define PREEMPT_ACTIVE 0x10000000 86 87 /* 88 * thread information flag bit numbers 89 */ 90 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 91 #define TIF_SIGPENDING 1 /* signal pending */ 92 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 93 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 94 TIF_NEED_RESCHED */ 95 #define TIF_32BIT 4 /* 32 bit binary */ 96 #define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */ 97 #define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */ 98 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 99 #define TIF_SINGLESTEP 8 /* singlestepping active */ 100 #define TIF_NOHZ 9 /* in adaptive nohz mode */ 101 #define TIF_SECCOMP 10 /* secure computing */ 102 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 103 #define TIF_NOERROR 12 /* Force successful syscall return */ 104 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 105 #define TIF_UPROBE 14 /* breakpointed or single-stepping */ 106 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ 107 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation 108 for stack store? */ 109 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 110 111 /* as above, but as bit values */ 112 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 113 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 114 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 115 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 116 #define _TIF_32BIT (1<<TIF_32BIT) 117 #define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK) 118 #define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW) 119 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 120 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 121 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 122 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 123 #define _TIF_NOERROR (1<<TIF_NOERROR) 124 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 125 #define _TIF_UPROBE (1<<TIF_UPROBE) 126 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 127 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) 128 #define _TIF_NOHZ (1<<TIF_NOHZ) 129 #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 130 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ 131 _TIF_NOHZ) 132 133 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 134 _TIF_NOTIFY_RESUME | _TIF_UPROBE) 135 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 136 137 /* Bits in local_flags */ 138 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 139 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 140 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 141 #define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */ 142 #define TLF_LAZY_MMU 3 /* tlb_batch is active */ 143 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ 144 145 #define _TLF_NAPPING (1 << TLF_NAPPING) 146 #define _TLF_SLEEPING (1 << TLF_SLEEPING) 147 #define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK) 148 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) 149 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) 150 151 #ifndef __ASSEMBLY__ 152 #define HAVE_SET_RESTORE_SIGMASK 1 153 static inline void set_restore_sigmask(void) 154 { 155 struct thread_info *ti = current_thread_info(); 156 ti->local_flags |= _TLF_RESTORE_SIGMASK; 157 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags)); 158 } 159 static inline void clear_restore_sigmask(void) 160 { 161 current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK; 162 } 163 static inline bool test_restore_sigmask(void) 164 { 165 return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK; 166 } 167 static inline bool test_and_clear_restore_sigmask(void) 168 { 169 struct thread_info *ti = current_thread_info(); 170 if (!(ti->local_flags & _TLF_RESTORE_SIGMASK)) 171 return false; 172 ti->local_flags &= ~_TLF_RESTORE_SIGMASK; 173 return true; 174 } 175 176 static inline bool test_thread_local_flags(unsigned int flags) 177 { 178 struct thread_info *ti = current_thread_info(); 179 return (ti->local_flags & flags) != 0; 180 } 181 182 #ifdef CONFIG_PPC64 183 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 184 #else 185 #define is_32bit_task() (1) 186 #endif 187 188 #endif /* !__ASSEMBLY__ */ 189 190 #endif /* __KERNEL__ */ 191 192 #endif /* _ASM_POWERPC_THREAD_INFO_H */ 193