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 #include <asm/asm-const.h>
  13 #include <asm/page.h>
  14
  15 #ifdef __KERNEL__
  16
  17 #if defined(CONFIG_VMAP_STACK) && CONFIG_THREAD_SHIFT < PAGE_SHIFT
  18 #define THREAD_SHIFT            PAGE_SHIFT
  19 #else
  20 #define THREAD_SHIFT            CONFIG_THREAD_SHIFT
  21 #endif
  22
  23 #define THREAD_SIZE             (1 << THREAD_SHIFT)
  24
  25 /*
  26  * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
  27  * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
  28  * assembly.
  29  */
  30 #ifdef CONFIG_VMAP_STACK
  31 #define THREAD_ALIGN_SHIFT      (THREAD_SHIFT + 1)
  32 #else
  33 #define THREAD_ALIGN_SHIFT      THREAD_SHIFT
  34 #endif
  35
  36 #define THREAD_ALIGN            (1 << THREAD_ALIGN_SHIFT)
  37
  38 #ifndef __ASSEMBLY__
  39 #include <linux/cache.h>
  40 #include <asm/processor.h>
  41 #include <asm/page.h>
  42 #include <asm/accounting.h>
  43
  44 #define SLB_PRELOAD_NR  16U
  45 /*
  46  * low level task data.
  47  */
  48 struct thread_info {
  49         int             preempt_count;          /* 0 => preemptable,
  50                                                    <0 => BUG */
  51         unsigned long   local_flags;            /* private flags for thread */
  52 #ifdef CONFIG_LIVEPATCH
  53         unsigned long *livepatch_sp;
  54 #endif
  55 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
  56         struct cpu_accounting_data accounting;
  57 #endif
  58         unsigned char slb_preload_nr;
  59         unsigned char slb_preload_tail;
  60         u32 slb_preload_esid[SLB_PRELOAD_NR];
  61
  62         /* low level flags - has atomic operations done on it */
  63         unsigned long   flags ____cacheline_aligned_in_smp;
  64 };
  65
  66 /*
  67  * macros/functions for gaining access to the thread information structure
  68  */
  69 #define INIT_THREAD_INFO(tsk)                   \
  70 {                                               \
  71         .preempt_count = INIT_PREEMPT_COUNT,    \
  72         .flags =        0,                      \
  73 }
  74
  75 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
  76
  77 /* how to get the thread information struct from C */
  78 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
  79
  80 void arch_setup_new_exec(void);
  81 #define arch_setup_new_exec arch_setup_new_exec
  82
  83 #endif /* __ASSEMBLY__ */
  84
  85 /*
  86  * thread information flag bit numbers
  87  */
  88 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  89 #define TIF_SIGPENDING          1       /* signal pending */
  90 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  91 #define TIF_NOTIFY_SIGNAL       3       /* signal notifications exist */
  92 #define TIF_SYSCALL_EMU         4       /* syscall emulation active */
  93 #define TIF_RESTORE_TM          5       /* need to restore TM FP/VEC/VSX */
  94 #define TIF_PATCH_PENDING       6       /* pending live patching update */
  95 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
  96 #define TIF_SINGLESTEP          8       /* singlestepping active */
  97 #define TIF_NOHZ                9       /* in adaptive nohz mode */
  98 #define TIF_SECCOMP             10      /* secure computing */
  99 #define TIF_RESTOREALL          11      /* Restore all regs (implies NOERROR) */
 100 #define TIF_NOERROR             12      /* Force successful syscall return */
 101 #define TIF_NOTIFY_RESUME       13      /* callback before returning to user */
 102 #define TIF_UPROBE              14      /* breakpointed or single-stepping */
 103 #define TIF_SYSCALL_TRACEPOINT  15      /* syscall tracepoint instrumentation */
 104 #define TIF_EMULATE_STACK_STORE 16      /* Is an instruction emulation
 105                                                 for stack store? */
 106 #define TIF_MEMDIE              17      /* is terminating due to OOM killer */
 107 #if defined(CONFIG_PPC64)
 108 #define TIF_ELF2ABI             18      /* function descriptors must die! */
 109 #endif
 110 #define TIF_POLLING_NRFLAG      19      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 111 #define TIF_32BIT               20      /* 32 bit binary */
 112
 113 /* as above, but as bit values */
 114 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 115 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 116 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 117 #define _TIF_NOTIFY_SIGNAL      (1<<TIF_NOTIFY_SIGNAL)
 118 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 119 #define _TIF_32BIT              (1<<TIF_32BIT)
 120 #define _TIF_RESTORE_TM         (1<<TIF_RESTORE_TM)
 121 #define _TIF_PATCH_PENDING      (1<<TIF_PATCH_PENDING)
 122 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 123 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 124 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 125 #define _TIF_RESTOREALL         (1<<TIF_RESTOREALL)
 126 #define _TIF_NOERROR            (1<<TIF_NOERROR)
 127 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 128 #define _TIF_UPROBE             (1<<TIF_UPROBE)
 129 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
 130 #define _TIF_EMULATE_STACK_STORE        (1<<TIF_EMULATE_STACK_STORE)
 131 #define _TIF_NOHZ               (1<<TIF_NOHZ)
 132 #define _TIF_SYSCALL_EMU        (1<<TIF_SYSCALL_EMU)
 133 #define _TIF_SYSCALL_DOTRACE    (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 134                                  _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
 135                                  _TIF_NOHZ | _TIF_SYSCALL_EMU)
 136
 137 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
 138                                  _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
 139                                  _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \
 140                                  _TIF_NOTIFY_SIGNAL)
 141 #define _TIF_PERSYSCALL_MASK    (_TIF_RESTOREALL|_TIF_NOERROR)
 142
 143 /* Bits in local_flags */
 144 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
 145 #define TLF_NAPPING             0       /* idle thread enabled NAP mode */
 146 #define TLF_SLEEPING            1       /* suspend code enabled SLEEP mode */
 147 #define TLF_LAZY_MMU            3       /* tlb_batch is active */
 148 #define TLF_RUNLATCH            4       /* Is the runlatch enabled? */
 149
 150 #define _TLF_NAPPING            (1 << TLF_NAPPING)
 151 #define _TLF_SLEEPING           (1 << TLF_SLEEPING)
 152 #define _TLF_LAZY_MMU           (1 << TLF_LAZY_MMU)
 153 #define _TLF_RUNLATCH           (1 << TLF_RUNLATCH)
 154
 155 #ifndef __ASSEMBLY__
 156
 157 static inline bool test_thread_local_flags(unsigned int flags)
 158 {
 159         struct thread_info *ti = current_thread_info();
 160         return (ti->local_flags & flags) != 0;
 161 }
 162
 163 #ifdef CONFIG_COMPAT
 164 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
 165 #else
 166 #define is_32bit_task() (IS_ENABLED(CONFIG_PPC32))
 167 #endif
 168
 169 #if defined(CONFIG_PPC64)
 170 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
 171 #else
 172 #define is_elf2_task() (0)
 173 #endif
 174
 175 #endif  /* !__ASSEMBLY__ */
 176
 177 #endif /* __KERNEL__ */
 178
 179 #endif /* _ASM_POWERPC_THREAD_INFO_H */