arch/sparc/include/asm/thread_info_64.h

   1 /* thread_info.h: sparc64 low-level thread information
   2  *
   3  * Copyright (C) 2002  David S. Miller (davem@redhat.com)
   4  */
   5
   6 #ifndef _ASM_THREAD_INFO_H
   7 #define _ASM_THREAD_INFO_H
   8
   9 #ifdef __KERNEL__
  10
  11 #define NSWINS          7
  12
  13 #define TI_FLAG_BYTE_FAULT_CODE         0
  14 #define TI_FLAG_FAULT_CODE_SHIFT        56
  15 #define TI_FLAG_BYTE_WSTATE             1
  16 #define TI_FLAG_WSTATE_SHIFT            48
  17 #define TI_FLAG_BYTE_NOERROR            2
  18 #define TI_FLAG_BYTE_NOERROR_SHIFT      40
  19 #define TI_FLAG_BYTE_FPDEPTH            3
  20 #define TI_FLAG_FPDEPTH_SHIFT           32
  21 #define TI_FLAG_BYTE_CWP                4
  22 #define TI_FLAG_CWP_SHIFT               24
  23 #define TI_FLAG_BYTE_WSAVED             5
  24 #define TI_FLAG_WSAVED_SHIFT            16
  25
  26 #include <asm/page.h>
  27
  28 #ifndef __ASSEMBLY__
  29
  30 #include <asm/ptrace.h>
  31 #include <asm/types.h>
  32
  33 struct task_struct;
  34 struct exec_domain;
  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         struct exec_domain      *exec_domain;
  48         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  49         __u8                    new_child;
  50         __u8                    current_ds;
  51         __u16                   cpu;
  52
  53         unsigned long           *utraps;
  54
  55         struct reg_window       reg_window[NSWINS];
  56         unsigned long           rwbuf_stkptrs[NSWINS];
  57
  58         unsigned long           gsr[7];
  59         unsigned long           xfsr[7];
  60
  61         struct restart_block    restart_block;
  62
  63         struct pt_regs          *kern_una_regs;
  64         unsigned int            kern_una_insn;
  65
  66         unsigned long           fpregs[0] __attribute__ ((aligned(64)));
  67 };
  68
  69 #endif /* !(__ASSEMBLY__) */
  70
  71 /* offsets into the thread_info struct for assembly code access */
  72 #define TI_TASK         0x00000000
  73 #define TI_FLAGS        0x00000008
  74 #define TI_FAULT_CODE   (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
  75 #define TI_WSTATE       (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
  76 #define TI_CWP          (TI_FLAGS + TI_FLAG_BYTE_CWP)
  77 #define TI_FPDEPTH      (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
  78 #define TI_WSAVED       (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
  79 #define TI_SYS_NOERROR  (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
  80 #define TI_FPSAVED      0x00000010
  81 #define TI_KSP          0x00000018
  82 #define TI_FAULT_ADDR   0x00000020
  83 #define TI_KREGS        0x00000028
  84 #define TI_EXEC_DOMAIN  0x00000030
  85 #define TI_PRE_COUNT    0x00000038
  86 #define TI_NEW_CHILD    0x0000003c
  87 #define TI_CURRENT_DS   0x0000003d
  88 #define TI_CPU          0x0000003e
  89 #define TI_UTRAPS       0x00000040
  90 #define TI_REG_WINDOW   0x00000048
  91 #define TI_RWIN_SPTRS   0x000003c8
  92 #define TI_GSR          0x00000400
  93 #define TI_XFSR         0x00000438
  94 #define TI_RESTART_BLOCK 0x00000470
  95 #define TI_KUNA_REGS    0x000004a0
  96 #define TI_KUNA_INSN    0x000004a8
  97 #define TI_FPREGS       0x000004c0
  98
  99 /* We embed this in the uppermost byte of thread_info->flags */
 100 #define FAULT_CODE_WRITE        0x01    /* Write access, implies D-TLB     */
 101 #define FAULT_CODE_DTLB         0x02    /* Miss happened in D-TLB          */
 102 #define FAULT_CODE_ITLB         0x04    /* Miss happened in I-TLB          */
 103 #define FAULT_CODE_WINFIXUP     0x08    /* Miss happened during spill/fill */
 104 #define FAULT_CODE_BLKCOMMIT    0x10    /* Use blk-commit ASI in copy_page */
 105
 106 #if PAGE_SHIFT == 13
 107 #define THREAD_SIZE (2*PAGE_SIZE)
 108 #define THREAD_SHIFT (PAGE_SHIFT + 1)
 109 #else /* PAGE_SHIFT == 13 */
 110 #define THREAD_SIZE PAGE_SIZE
 111 #define THREAD_SHIFT PAGE_SHIFT
 112 #endif /* PAGE_SHIFT == 13 */
 113
 114 #define PREEMPT_ACTIVE          0x10000000
 115
 116 /*
 117  * macros/functions for gaining access to the thread information structure
 118  */
 119 #ifndef __ASSEMBLY__
 120
 121 #define INIT_THREAD_INFO(tsk)                           \
 122 {                                                       \
 123         .task           =       &tsk,                   \
 124         .current_ds     =       ASI_P,                  \
 125         .exec_domain    =       &default_exec_domain,   \
 126         .preempt_count  =       INIT_PREEMPT_COUNT,     \
 127         .restart_block  = {                             \
 128                 .fn     =       do_no_restart_syscall,  \
 129         },                                              \
 130 }
 131
 132 #define init_thread_info        (init_thread_union.thread_info)
 133 #define init_stack              (init_thread_union.stack)
 134
 135 /* how to get the thread information struct from C */
 136 register struct thread_info *current_thread_info_reg asm("g6");
 137 #define current_thread_info()   (current_thread_info_reg)
 138
 139 /* thread information allocation */
 140 #if PAGE_SHIFT == 13
 141 #define THREAD_SIZE_ORDER       1
 142 #else /* PAGE_SHIFT == 13 */
 143 #define THREAD_SIZE_ORDER       0
 144 #endif /* PAGE_SHIFT == 13 */
 145
 146 #define __thread_flag_byte_ptr(ti)      \
 147         ((unsigned char *)(&((ti)->flags)))
 148 #define __cur_thread_flag_byte_ptr      __thread_flag_byte_ptr(current_thread_info())
 149
 150 #define get_thread_fault_code()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
 151 #define set_thread_fault_code(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
 152 #define get_thread_wstate()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
 153 #define set_thread_wstate(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
 154 #define get_thread_cwp()                (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
 155 #define set_thread_cwp(val)             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
 156 #define get_thread_noerror()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
 157 #define set_thread_noerror(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
 158 #define get_thread_fpdepth()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
 159 #define set_thread_fpdepth(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
 160 #define get_thread_wsaved()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
 161 #define set_thread_wsaved(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
 162 #endif /* !(__ASSEMBLY__) */
 163
 164 /*
 165  * Thread information flags, only 16 bits are available as we encode
 166  * other values into the upper 6 bytes.
 167  *
 168  * On trap return we need to test several values:
 169  *
 170  * user:        need_resched, notify_resume, sigpending, wsaved
 171  * kernel:      fpdepth
 172  *
 173  * So to check for work in the kernel case we simply load the fpdepth
 174  * byte out of the flags and test it.  For the user case we encode the
 175  * lower 3 bytes of flags as follows:
 176  *      ----------------------------------------
 177  *      | wsaved | flags byte 1 | flags byte 2 |
 178  *      ----------------------------------------
 179  * This optimizes the user test into:
 180  *      ldx             [%g6 + TI_FLAGS], REG1
 181  *      sethi           %hi(_TIF_USER_WORK_MASK), REG2
 182  *      or              REG2, %lo(_TIF_USER_WORK_MASK), REG2
 183  *      andcc           REG1, REG2, %g0
 184  *      be,pt           no_work_to_do
 185  *       nop
 186  */
 187 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 188 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 189 #define TIF_SIGPENDING          2       /* signal pending */
 190 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 191 /* flag bit 4 is available */
 192 #define TIF_UNALIGNED           5       /* allowed to do unaligned accesses */
 193 /* flag bit 6 is available */
 194 #define TIF_32BIT               7       /* 32-bit binary */
 195 /* flag bit 8 is available */
 196 #define TIF_SECCOMP             9       /* secure computing */
 197 #define TIF_SYSCALL_AUDIT       10      /* syscall auditing active */
 198 #define TIF_SYSCALL_TRACEPOINT  11      /* syscall tracepoint instrumentation */
 199 /* NOTE: Thread flags >= 12 should be ones we have no interest
 200  *       in using in assembly, else we can't use the mask as
 201  *       an immediate value in instructions such as andcc.
 202  */
 203 /* flag bit 12 is available */
 204 #define TIF_MEMDIE              13      /* is terminating due to OOM killer */
 205 #define TIF_POLLING_NRFLAG      14
 206
 207 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 208 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 209 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 210 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 211 #define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
 212 #define _TIF_32BIT              (1<<TIF_32BIT)
 213 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 214 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 215 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
 216 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 217
 218 #define _TIF_USER_WORK_MASK     ((0xff << TI_FLAG_WSAVED_SHIFT) | \
 219                                  _TIF_DO_NOTIFY_RESUME_MASK | \
 220                                  _TIF_NEED_RESCHED)
 221 #define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
 222
 223 /*
 224  * Thread-synchronous status.
 225  *
 226  * This is different from the flags in that nobody else
 227  * ever touches our thread-synchronous status, so we don't
 228  * have to worry about atomic accesses.
 229  *
 230  * Note that there are only 8 bits available.
 231  */
 232 #define TS_RESTORE_SIGMASK      0x0001  /* restore signal mask in do_signal() */
 233
 234 #ifndef __ASSEMBLY__
 235 #define HAVE_SET_RESTORE_SIGMASK        1
 236 static inline void set_restore_sigmask(void)
 237 {
 238         struct thread_info *ti = current_thread_info();
 239         ti->status |= TS_RESTORE_SIGMASK;
 240         WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
 241 }
 242 static inline void clear_restore_sigmask(void)
 243 {
 244         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 245 }
 246 static inline bool test_restore_sigmask(void)
 247 {
 248         return current_thread_info()->status & TS_RESTORE_SIGMASK;
 249 }
 250 static inline bool test_and_clear_restore_sigmask(void)
 251 {
 252         struct thread_info *ti = current_thread_info();
 253         if (!(ti->status & TS_RESTORE_SIGMASK))
 254                 return false;
 255         ti->status &= ~TS_RESTORE_SIGMASK;
 256         return true;
 257 }
 258
 259 #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
 260 #define test_thread_64bit_stack(__SP) \
 261         ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \
 262          false : true)
 263
 264 #endif  /* !__ASSEMBLY__ */
 265
 266 #endif /* __KERNEL__ */
 267
 268 #endif /* _ASM_THREAD_INFO_H */