arch/powerpc/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* thread_info.h: PowerPC low-level thread information
   3  * adapted from the i386 version by Paul Mackerras
   4  *
   5  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   6  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   7  */
   8
   9 #ifndef _ASM_POWERPC_THREAD_INFO_H
  10 #define _ASM_POWERPC_THREAD_INFO_H
  11
  12 #ifdef __KERNEL__
  13
  14 #define THREAD_SHIFT            CONFIG_THREAD_SHIFT
  15
  16 #define THREAD_SIZE             (1 << THREAD_SHIFT)
  17
  18 #ifdef CONFIG_PPC64
  19 #define CURRENT_THREAD_INFO(dest, sp)   stringify_in_c(clrrdi dest, sp, THREAD_SHIFT)
  20 #else
  21 #define CURRENT_THREAD_INFO(dest, sp)   stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT)
  22 #endif
  23
  24 #ifndef __ASSEMBLY__
  25 #include <linux/cache.h>
  26 #include <asm/processor.h>
  27 #include <asm/page.h>
  28 #include <linux/stringify.h>
  29 #include <asm/accounting.h>
  30
  31 /*
  32  * low level task data.
  33  */
  34 struct thread_info {
  35         struct task_struct *task;               /* main task structure */
  36         int             cpu;                    /* cpu we're on */
  37         int             preempt_count;          /* 0 => preemptable,
  38                                                    <0 => BUG */
  39         unsigned long   local_flags;            /* private flags for thread */
  40 #ifdef CONFIG_LIVEPATCH
  41         unsigned long *livepatch_sp;
  42 #endif
  43 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
  44         struct cpu_accounting_data accounting;
  45 #endif
  46         /* low level flags - has atomic operations done on it */
  47         unsigned long   flags ____cacheline_aligned_in_smp;
  48 };
  49
  50 /*
  51  * macros/functions for gaining access to the thread information structure
  52  */
  53 #define INIT_THREAD_INFO(tsk)                   \
  54 {                                               \
  55         .task =         &tsk,                   \
  56         .cpu =          0,                      \
  57         .preempt_count = INIT_PREEMPT_COUNT,    \
  58         .flags =        0,                      \
  59 }
  60
  61 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
  62
  63 /* how to get the thread information struct from C */
  64 static inline struct thread_info *current_thread_info(void)
  65 {
  66         unsigned long val;
  67
  68         asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val));
  69
  70         return (struct thread_info *)val;
  71 }
  72
  73 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
  74 #endif /* __ASSEMBLY__ */
  75
  76 /*
  77  * thread information flag bit numbers
  78  */
  79 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  80 #define TIF_SIGPENDING          1       /* signal pending */
  81 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  82 #define TIF_FSCHECK             3       /* Check FS is USER_DS on return */
  83 #define TIF_32BIT               4       /* 32 bit binary */
  84 #define TIF_RESTORE_TM          5       /* need to restore TM FP/VEC/VSX */
  85 #define TIF_PATCH_PENDING       6       /* pending live patching update */
  86 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
  87 #define TIF_SINGLESTEP          8       /* singlestepping active */
  88 #define TIF_NOHZ                9       /* in adaptive nohz mode */
  89 #define TIF_SECCOMP             10      /* secure computing */
  90 #define TIF_RESTOREALL          11      /* Restore all regs (implies NOERROR) */
  91 #define TIF_NOERROR             12      /* Force successful syscall return */
  92 #define TIF_NOTIFY_RESUME       13      /* callback before returning to user */
  93 #define TIF_UPROBE              14      /* breakpointed or single-stepping */
  94 #define TIF_SYSCALL_TRACEPOINT  15      /* syscall tracepoint instrumentation */
  95 #define TIF_EMULATE_STACK_STORE 16      /* Is an instruction emulation
  96                                                 for stack store? */
  97 #define TIF_MEMDIE              17      /* is terminating due to OOM killer */
  98 #if defined(CONFIG_PPC64)
  99 #define TIF_ELF2ABI             18      /* function descriptors must die! */
 100 #endif
 101 #define TIF_POLLING_NRFLAG      19      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 102
 103 /* as above, but as bit values */
 104 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 105 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 106 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 107 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 108 #define _TIF_32BIT              (1<<TIF_32BIT)
 109 #define _TIF_RESTORE_TM         (1<<TIF_RESTORE_TM)
 110 #define _TIF_PATCH_PENDING      (1<<TIF_PATCH_PENDING)
 111 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 112 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 113 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 114 #define _TIF_RESTOREALL         (1<<TIF_RESTOREALL)
 115 #define _TIF_NOERROR            (1<<TIF_NOERROR)
 116 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 117 #define _TIF_UPROBE             (1<<TIF_UPROBE)
 118 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
 119 #define _TIF_EMULATE_STACK_STORE        (1<<TIF_EMULATE_STACK_STORE)
 120 #define _TIF_NOHZ               (1<<TIF_NOHZ)
 121 #define _TIF_FSCHECK            (1<<TIF_FSCHECK)
 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                                  _TIF_FSCHECK)
 130 #define _TIF_PERSYSCALL_MASK    (_TIF_RESTOREALL|_TIF_NOERROR)
 131
 132 /* Bits in local_flags */
 133 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
 134 #define TLF_NAPPING             0       /* idle thread enabled NAP mode */
 135 #define TLF_SLEEPING            1       /* suspend code enabled SLEEP mode */
 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_LAZY_MMU           (1 << TLF_LAZY_MMU)
 142 #define _TLF_RUNLATCH           (1 << TLF_RUNLATCH)
 143
 144 #ifndef __ASSEMBLY__
 145
 146 static inline bool test_thread_local_flags(unsigned int flags)
 147 {
 148         struct thread_info *ti = current_thread_info();
 149         return (ti->local_flags & flags) != 0;
 150 }
 151
 152 #ifdef CONFIG_PPC64
 153 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
 154 #else
 155 #define is_32bit_task() (1)
 156 #endif
 157
 158 #if defined(CONFIG_PPC64)
 159 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
 160 #else
 161 #define is_elf2_task() (0)
 162 #endif
 163
 164 #endif  /* !__ASSEMBLY__ */
 165
 166 #endif /* __KERNEL__ */
 167
 168 #endif /* _ASM_POWERPC_THREAD_INFO_H */