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 #define THREAD_SHIFT CONFIG_THREAD_SHIFT 14 15 #define THREAD_SIZE (1 << THREAD_SHIFT) 16 17 #ifdef CONFIG_PPC64 18 #define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(clrrdi dest, sp, THREAD_SHIFT) 19 #else 20 #define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT) 21 #endif 22 23 #ifndef __ASSEMBLY__ 24 #include <linux/cache.h> 25 #include <asm/processor.h> 26 #include <asm/page.h> 27 #include <linux/stringify.h> 28 #include <asm/accounting.h> 29 30 /* 31 * low level task data. 32 */ 33 struct thread_info { 34 struct task_struct *task; /* main task structure */ 35 int cpu; /* cpu we're on */ 36 int preempt_count; /* 0 => preemptable, 37 <0 => BUG */ 38 unsigned long local_flags; /* private flags for thread */ 39 #ifdef CONFIG_LIVEPATCH 40 unsigned long *livepatch_sp; 41 #endif 42 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32) 43 struct cpu_accounting_data accounting; 44 #endif 45 /* low level flags - has atomic operations done on it */ 46 unsigned long flags ____cacheline_aligned_in_smp; 47 }; 48 49 /* 50 * macros/functions for gaining access to the thread information structure 51 */ 52 #define INIT_THREAD_INFO(tsk) \ 53 { \ 54 .task = &tsk, \ 55 .cpu = 0, \ 56 .preempt_count = INIT_PREEMPT_COUNT, \ 57 .flags = 0, \ 58 } 59 60 #define init_thread_info (init_thread_union.thread_info) 61 #define init_stack (init_thread_union.stack) 62 63 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 64 65 /* how to get the thread information struct from C */ 66 static inline struct thread_info *current_thread_info(void) 67 { 68 unsigned long val; 69 70 asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val)); 71 72 return (struct thread_info *)val; 73 } 74 75 #endif /* __ASSEMBLY__ */ 76 77 /* 78 * thread information flag bit numbers 79 */ 80 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 81 #define TIF_SIGPENDING 1 /* signal pending */ 82 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 83 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 84 TIF_NEED_RESCHED */ 85 #define TIF_32BIT 4 /* 32 bit binary */ 86 #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ 87 #define TIF_PATCH_PENDING 6 /* pending live patching update */ 88 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 89 #define TIF_SINGLESTEP 8 /* singlestepping active */ 90 #define TIF_NOHZ 9 /* in adaptive nohz mode */ 91 #define TIF_SECCOMP 10 /* secure computing */ 92 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 93 #define TIF_NOERROR 12 /* Force successful syscall return */ 94 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 95 #define TIF_UPROBE 14 /* breakpointed or single-stepping */ 96 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ 97 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation 98 for stack store? */ 99 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 100 #if defined(CONFIG_PPC64) 101 #define TIF_ELF2ABI 18 /* function descriptors must die! */ 102 #endif 103 104 /* as above, but as bit values */ 105 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 106 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 107 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 108 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 109 #define _TIF_32BIT (1<<TIF_32BIT) 110 #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) 111 #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING) 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 | _TIF_PATCH_PENDING) 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_LAZY_MMU 3 /* tlb_batch is active */ 136 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ 137 138 #define _TLF_NAPPING (1 << TLF_NAPPING) 139 #define _TLF_SLEEPING (1 << TLF_SLEEPING) 140 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) 141 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) 142 143 #ifndef __ASSEMBLY__ 144 145 static inline bool test_thread_local_flags(unsigned int flags) 146 { 147 struct thread_info *ti = current_thread_info(); 148 return (ti->local_flags & flags) != 0; 149 } 150 151 #ifdef CONFIG_PPC64 152 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 153 #else 154 #define is_32bit_task() (1) 155 #endif 156 157 #if defined(CONFIG_PPC64) 158 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) 159 #else 160 #define is_elf2_task() (0) 161 #endif 162 163 #endif /* !__ASSEMBLY__ */ 164 165 #endif /* __KERNEL__ */ 166 167 #endif /* _ASM_POWERPC_THREAD_INFO_H */ 168