arch/sparc/include/asm/thread_info

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   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* thread_info.h: sparc64 low-level thread information
   3  *
   4  * Copyright (C) 2002  David S. Miller (davem@redhat.com)
   5  */
   6 
   7 #ifndef _ASM_THREAD_INFO_H
   8 #define _ASM_THREAD_INFO_H
   9 
  10 #ifdef __KERNEL__
  11 
  12 #define NSWINS          7
  13 
  14 #define TI_FLAG_BYTE_FAULT_CODE         0
  15 #define TI_FLAG_FAULT_CODE_SHIFT        56
  16 #define TI_FLAG_BYTE_WSTATE             1
  17 #define TI_FLAG_WSTATE_SHIFT            48
  18 #define TI_FLAG_BYTE_NOERROR            2
  19 #define TI_FLAG_BYTE_NOERROR_SHIFT      40
  20 #define TI_FLAG_BYTE_FPDEPTH            3
  21 #define TI_FLAG_FPDEPTH_SHIFT           32
  22 #define TI_FLAG_BYTE_CWP                4
  23 #define TI_FLAG_CWP_SHIFT               24
  24 #define TI_FLAG_BYTE_WSAVED             5
  25 #define TI_FLAG_WSAVED_SHIFT            16
  26 
  27 #include <asm/page.h>
  28 
  29 #ifndef __ASSEMBLY__
  30 
  31 #include <asm/ptrace.h>
  32 #include <asm/types.h>
  33 
  34 struct task_struct;
  35 
  36 struct thread_info {
  37         /* D$ line 1 */
  38         struct task_struct      *task;
  39         unsigned long           flags;
  40         __u8                    fpsaved[7];
  41         __u8                    status;
  42         unsigned long           ksp;
  43 
  44         /* D$ line 2 */
  45         unsigned long           fault_address;
  46         struct pt_regs          *kregs;
  47         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  48         __u8                    new_child;
  49         __u8                    current_ds;
  50         __u16                   cpu;
  51 
  52         unsigned long           *utraps;
  53 
  54         struct reg_window       reg_window[NSWINS];
  55         unsigned long           rwbuf_stkptrs[NSWINS];
  56 
  57         unsigned long           gsr[7];
  58         unsigned long           xfsr[7];
  59 
  60         struct pt_regs          *kern_una_regs;
  61         unsigned int            kern_una_insn;
  62 
  63         unsigned long           fpregs[(7 * 256) / sizeof(unsigned long)]
  64                 __attribute__ ((aligned(64)));
  65 };
  66 
  67 #endif /* !(__ASSEMBLY__) */
  68 
  69 /* offsets into the thread_info struct for assembly code access */
  70 #define TI_TASK         0x00000000
  71 #define TI_FLAGS        0x00000008
  72 #define TI_FAULT_CODE   (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
  73 #define TI_WSTATE       (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
  74 #define TI_CWP          (TI_FLAGS + TI_FLAG_BYTE_CWP)
  75 #define TI_FPDEPTH      (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
  76 #define TI_WSAVED       (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
  77 #define TI_SYS_NOERROR  (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
  78 #define TI_FPSAVED      0x00000010
  79 #define TI_KSP          0x00000018
  80 #define TI_FAULT_ADDR   0x00000020
  81 #define TI_KREGS        0x00000028
  82 #define TI_PRE_COUNT    0x00000030
  83 #define TI_NEW_CHILD    0x00000034
  84 #define TI_CURRENT_DS   0x00000035
  85 #define TI_CPU          0x00000036
  86 #define TI_UTRAPS       0x00000038
  87 #define TI_REG_WINDOW   0x00000040
  88 #define TI_RWIN_SPTRS   0x000003c0
  89 #define TI_GSR          0x000003f8
  90 #define TI_XFSR         0x00000430
  91 #define TI_KUNA_REGS    0x00000468
  92 #define TI_KUNA_INSN    0x00000470
  93 #define TI_FPREGS       0x00000480
  94 
  95 /* We embed this in the uppermost byte of thread_info->flags */
  96 #define FAULT_CODE_WRITE        0x01    /* Write access, implies D-TLB     */
  97 #define FAULT_CODE_DTLB         0x02    /* Miss happened in D-TLB          */
  98 #define FAULT_CODE_ITLB         0x04    /* Miss happened in I-TLB          */
  99 #define FAULT_CODE_WINFIXUP     0x08    /* Miss happened during spill/fill */
 100 #define FAULT_CODE_BLKCOMMIT    0x10    /* Use blk-commit ASI in copy_page */
 101 #define FAULT_CODE_BAD_RA       0x20    /* Bad RA for sun4v                */
 102 
 103 #if PAGE_SHIFT == 13
 104 #define THREAD_SIZE (2*PAGE_SIZE)
 105 #define THREAD_SHIFT (PAGE_SHIFT + 1)
 106 #else /* PAGE_SHIFT == 13 */
 107 #define THREAD_SIZE PAGE_SIZE
 108 #define THREAD_SHIFT PAGE_SHIFT
 109 #endif /* PAGE_SHIFT == 13 */
 110 
 111 /*
 112  * macros/functions for gaining access to the thread information structure
 113  */
 114 #ifndef __ASSEMBLY__
 115 
 116 #define INIT_THREAD_INFO(tsk)                           \
 117 {                                                       \
 118         .task           =       &tsk,                   \
 119         .current_ds     =       ASI_P,                  \
 120         .preempt_count  =       INIT_PREEMPT_COUNT,     \
 121 }
 122 
 123 /* how to get the thread information struct from C */
 124 #ifndef BUILD_VDSO
 125 register struct thread_info *current_thread_info_reg asm("g6");
 126 #define current_thread_info()   (current_thread_info_reg)
 127 #else
 128 extern struct thread_info *current_thread_info(void);
 129 #endif
 130 
 131 /* thread information allocation */
 132 #if PAGE_SHIFT == 13
 133 #define THREAD_SIZE_ORDER       1
 134 #else /* PAGE_SHIFT == 13 */
 135 #define THREAD_SIZE_ORDER       0
 136 #endif /* PAGE_SHIFT == 13 */
 137 
 138 #define __thread_flag_byte_ptr(ti)      \
 139         ((unsigned char *)(&((ti)->flags)))
 140 #define __cur_thread_flag_byte_ptr      __thread_flag_byte_ptr(current_thread_info())
 141 
 142 #define get_thread_fault_code()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
 143 #define set_thread_fault_code(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
 144 #define get_thread_wstate()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
 145 #define set_thread_wstate(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
 146 #define get_thread_cwp()                (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
 147 #define set_thread_cwp(val)             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
 148 #define get_thread_noerror()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
 149 #define set_thread_noerror(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
 150 #define get_thread_fpdepth()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
 151 #define set_thread_fpdepth(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
 152 #define get_thread_wsaved()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
 153 #define set_thread_wsaved(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
 154 #endif /* !(__ASSEMBLY__) */
 155 
 156 /*
 157  * Thread information flags, only 16 bits are available as we encode
 158  * other values into the upper 6 bytes.
 159  *
 160  * On trap return we need to test several values:
 161  *
 162  * user:        need_resched, notify_resume, sigpending, wsaved
 163  * kernel:      fpdepth
 164  *
 165  * So to check for work in the kernel case we simply load the fpdepth
 166  * byte out of the flags and test it.  For the user case we encode the
 167  * lower 3 bytes of flags as follows:
 168  *      ----------------------------------------
 169  *      | wsaved | flags byte 1 | flags byte 2 |
 170  *      ----------------------------------------
 171  * This optimizes the user test into:
 172  *      ldx             [%g6 + TI_FLAGS], REG1
 173  *      sethi           %hi(_TIF_USER_WORK_MASK), REG2
 174  *      or              REG2, %lo(_TIF_USER_WORK_MASK), REG2
 175  *      andcc           REG1, REG2, %g0
 176  *      be,pt           no_work_to_do
 177  *       nop
 178  */
 179 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 180 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 181 #define TIF_SIGPENDING          2       /* signal pending */
 182 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 183 /* flag bit 4 is available */
 184 #define TIF_UNALIGNED           5       /* allowed to do unaligned accesses */
 185 #define TIF_UPROBE              6       /* breakpointed or singlestepped */
 186 #define TIF_32BIT               7       /* 32-bit binary */
 187 #define TIF_NOHZ                8       /* in adaptive nohz mode */
 188 #define TIF_SECCOMP             9       /* secure computing */
 189 #define TIF_SYSCALL_AUDIT       10      /* syscall auditing active */
 190 #define TIF_SYSCALL_TRACEPOINT  11      /* syscall tracepoint instrumentation */
 191 /* NOTE: Thread flags >= 12 should be ones we have no interest
 192  *       in using in assembly, else we can't use the mask as
 193  *       an immediate value in instructions such as andcc.
 194  */
 195 #define TIF_MCDPER              12      /* Precise MCD exception */
 196 #define TIF_MEMDIE              13      /* is terminating due to OOM killer */
 197 #define TIF_POLLING_NRFLAG      14
 198 
 199 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 200 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 201 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 202 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 203 #define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
 204 #define _TIF_UPROBE             (1<<TIF_UPROBE)
 205 #define _TIF_32BIT              (1<<TIF_32BIT)
 206 #define _TIF_NOHZ               (1<<TIF_NOHZ)
 207 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 208 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 209 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
 210 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 211 
 212 #define _TIF_USER_WORK_MASK     ((0xff << TI_FLAG_WSAVED_SHIFT) | \
 213                                  _TIF_DO_NOTIFY_RESUME_MASK | \
 214                                  _TIF_NEED_RESCHED)
 215 #define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | \
 216                                          _TIF_SIGPENDING | _TIF_UPROBE)
 217 
 218 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
 219 
 220 /*
 221  * Thread-synchronous status.
 222  *
 223  * This is different from the flags in that nobody else
 224  * ever touches our thread-synchronous status, so we don't
 225  * have to worry about atomic accesses.
 226  *
 227  * Note that there are only 8 bits available.
 228  */
 229 
 230 #ifndef __ASSEMBLY__
 231 
 232 #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
 233 #define test_thread_64bit_stack(__SP) \
 234         ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \
 235          false : true)
 236 
 237 #endif  /* !__ASSEMBLY__ */
 238 
 239 #endif /* __KERNEL__ */
 240 
 241 #endif /* _ASM_THREAD_INFO_H */
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root/arch/sparc/include/asm/thread_info_64.h

INCLUDED FROM
