arch/sparc/include/asm/thread_info_32.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * thread_info.h: sparc low-level thread information
   4  * adapted from the ppc version by Pete Zaitcev, which was
   5  * adapted from the i386 version by Paul Mackerras
   6  *
   7  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   8  * Copyright (c) 2002  Pete Zaitcev (zaitcev@yahoo.com)
   9  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
  10  */
  11
  12 #ifndef _ASM_THREAD_INFO_H
  13 #define _ASM_THREAD_INFO_H
  14
  15 #ifdef __KERNEL__
  16
  17 #ifndef __ASSEMBLY__
  18
  19 #include <asm/ptrace.h>
  20 #include <asm/page.h>
  21
  22 /*
  23  * Low level task data.
  24  *
  25  * If you change this, change the TI_* offsets below to match.
  26  */
  27 #define NSWINS 8
  28 struct thread_info {
  29         unsigned long           uwinmask;
  30         struct task_struct      *task;          /* main task structure */
  31         unsigned long           flags;          /* low level flags */
  32         int                     cpu;            /* cpu we're on */
  33         int                     preempt_count;  /* 0 => preemptable,
  34                                                    <0 => BUG */
  35         int                     softirq_count;
  36         int                     hardirq_count;
  37
  38         u32 __unused;
  39
  40         /* Context switch saved kernel state. */
  41         unsigned long ksp;      /* ... ksp __attribute__ ((aligned (8))); */
  42         unsigned long kpc;
  43         unsigned long kpsr;
  44         unsigned long kwim;
  45
  46         /* A place to store user windows and stack pointers
  47          * when the stack needs inspection.
  48          */
  49         struct reg_window32     reg_window[NSWINS];     /* align for ldd! */
  50         unsigned long           rwbuf_stkptrs[NSWINS];
  51         unsigned long           w_saved;
  52 };
  53
  54 /*
  55  * macros/functions for gaining access to the thread information structure
  56  */
  57 #define INIT_THREAD_INFO(tsk)                           \
  58 {                                                       \
  59         .uwinmask       =       0,                      \
  60         .task           =       &tsk,                   \
  61         .flags          =       0,                      \
  62         .cpu            =       0,                      \
  63         .preempt_count  =       INIT_PREEMPT_COUNT,     \
  64 }
  65
  66 #define init_thread_info        (init_thread_union.thread_info)
  67 #define init_stack              (init_thread_union.stack)
  68
  69 /* how to get the thread information struct from C */
  70 register struct thread_info *current_thread_info_reg asm("g6");
  71 #define current_thread_info()   (current_thread_info_reg)
  72
  73 /*
  74  * thread information allocation
  75  */
  76 #define THREAD_SIZE_ORDER  1
  77
  78 #endif /* __ASSEMBLY__ */
  79
  80 /* Size of kernel stack for each process */
  81 #define THREAD_SIZE             (2 * PAGE_SIZE)
  82
  83 /*
  84  * Offsets in thread_info structure, used in assembly code
  85  * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
  86  */
  87 #define TI_UWINMASK     0x00    /* uwinmask */
  88 #define TI_TASK         0x04
  89 #define TI_FLAGS        0x08
  90 #define TI_CPU          0x0c
  91 #define TI_PREEMPT      0x10    /* preempt_count */
  92 #define TI_SOFTIRQ      0x14    /* softirq_count */
  93 #define TI_HARDIRQ      0x18    /* hardirq_count */
  94 #define TI_KSP          0x20    /* ksp */
  95 #define TI_KPC          0x24    /* kpc (ldd'ed with kpc) */
  96 #define TI_KPSR         0x28    /* kpsr */
  97 #define TI_KWIM         0x2c    /* kwim (ldd'ed with kpsr) */
  98 #define TI_REG_WINDOW   0x30
  99 #define TI_RWIN_SPTRS   0x230
 100 #define TI_W_SAVED      0x250
 101
 102 /*
 103  * thread information flag bit numbers
 104  */
 105 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 106 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 107 #define TIF_SIGPENDING          2       /* signal pending */
 108 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 109 #define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
 110 #define TIF_USEDFPU             8       /* FPU was used by this task
 111                                          * this quantum (SMP) */
 112 #define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling
 113                                          * TIF_NEED_RESCHED */
 114 #define TIF_MEMDIE              10      /* is terminating due to OOM killer */
 115
 116 /* as above, but as bit values */
 117 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 118 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 119 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 120 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 121 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 122 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 123
 124 #define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | \
 125                                          _TIF_SIGPENDING)
 126
 127 #define is_32bit_task() (1)
 128
 129 #endif /* __KERNEL__ */
 130
 131 #endif /* _ASM_THREAD_INFO_H */