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 register unsigned long __current_r1 asm("r1"); 75 static inline struct thread_info *current_thread_info(void) 76 { 77 /* gcc4, at least, is smart enough to turn this into a single 78 * rlwinm for ppc32 and clrrdi for ppc64 */ 79 return (struct thread_info *)(__current_r1 & ~(THREAD_SIZE-1)); 80 } 81 82 #endif /* __ASSEMBLY__ */ 83 84 /* 85 * thread information flag bit numbers 86 */ 87 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 88 #define TIF_SIGPENDING 1 /* signal pending */ 89 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 90 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 91 TIF_NEED_RESCHED */ 92 #define TIF_32BIT 4 /* 32 bit binary */ 93 #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ 94 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 95 #define TIF_SINGLESTEP 8 /* singlestepping active */ 96 #define TIF_NOHZ 9 /* in adaptive nohz mode */ 97 #define TIF_SECCOMP 10 /* secure computing */ 98 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 99 #define TIF_NOERROR 12 /* Force successful syscall return */ 100 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 101 #define TIF_UPROBE 14 /* breakpointed or single-stepping */ 102 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ 103 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation 104 for stack store? */ 105 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 106 #if defined(CONFIG_PPC64) 107 #define TIF_ELF2ABI 18 /* function descriptors must die! */ 108 #endif 109 110 /* as above, but as bit values */ 111 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 112 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 113 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 114 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 115 #define _TIF_32BIT (1<<TIF_32BIT) 116 #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) 117 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 118 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 119 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 120 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 121 #define _TIF_NOERROR (1<<TIF_NOERROR) 122 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 123 #define _TIF_UPROBE (1<<TIF_UPROBE) 124 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 125 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) 126 #define _TIF_NOHZ (1<<TIF_NOHZ) 127 #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 128 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ 129 _TIF_NOHZ) 130 131 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 132 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ 133 _TIF_RESTORE_TM) 134 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 135 136 /* Bits in local_flags */ 137 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 138 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 139 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 140 #define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */ 141 #define TLF_LAZY_MMU 3 /* tlb_batch is active */ 142 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ 143 144 #define _TLF_NAPPING (1 << TLF_NAPPING) 145 #define _TLF_SLEEPING (1 << TLF_SLEEPING) 146 #define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK) 147 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) 148 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) 149 150 #ifndef __ASSEMBLY__ 151 #define HAVE_SET_RESTORE_SIGMASK 1 152 static inline void set_restore_sigmask(void) 153 { 154 struct thread_info *ti = current_thread_info(); 155 ti->local_flags |= _TLF_RESTORE_SIGMASK; 156 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags)); 157 } 158 static inline void clear_restore_sigmask(void) 159 { 160 current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK; 161 } 162 static inline bool test_restore_sigmask(void) 163 { 164 return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK; 165 } 166 static inline bool test_and_clear_restore_sigmask(void) 167 { 168 struct thread_info *ti = current_thread_info(); 169 if (!(ti->local_flags & _TLF_RESTORE_SIGMASK)) 170 return false; 171 ti->local_flags &= ~_TLF_RESTORE_SIGMASK; 172 return true; 173 } 174 175 static inline bool test_thread_local_flags(unsigned int flags) 176 { 177 struct thread_info *ti = current_thread_info(); 178 return (ti->local_flags & flags) != 0; 179 } 180 181 #ifdef CONFIG_PPC64 182 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 183 #else 184 #define is_32bit_task() (1) 185 #endif 186 187 #if defined(CONFIG_PPC64) 188 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) 189 #else 190 #define is_elf2_task() (0) 191 #endif 192 193 #endif /* !__ASSEMBLY__ */ 194 195 #endif /* __KERNEL__ */ 196 197 #endif /* _ASM_POWERPC_THREAD_INFO_H */ 198