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_CWP                2
  18 #define TI_FLAG_CWP_SHIFT               40
  19 #define TI_FLAG_BYTE_CURRENT_DS         3
  20 #define TI_FLAG_CURRENT_DS_SHIFT        32
  21 #define TI_FLAG_BYTE_FPDEPTH            4
  22 #define TI_FLAG_FPDEPTH_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                    syscall_noerror;
  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_CURRENT_DS   (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
  78 #define TI_FPDEPTH      (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
  79 #define TI_WSAVED       (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
  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_SYS_NOERROR  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         .flags          = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT,   \
 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_INFO_ORDER     1
 142 #else /* PAGE_SHIFT == 13 */
 143 #define __THREAD_INFO_ORDER     0
 144 #endif /* PAGE_SHIFT == 13 */
 145
 146 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
 147
 148 #ifdef CONFIG_DEBUG_STACK_USAGE
 149 #define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
 150 #else
 151 #define THREAD_FLAGS (GFP_KERNEL)
 152 #endif
 153
 154 #define alloc_thread_info_node(tsk, node)                               \
 155 ({                                                                      \
 156         struct page *page = alloc_pages_node(node, THREAD_FLAGS,        \
 157                                              __THREAD_INFO_ORDER);      \
 158         struct thread_info *ret;                                        \
 159                                                                         \
 160         ret = page ? page_address(page) : NULL;                         \
 161         ret;                                                            \
 162 })
 163
 164 #define free_thread_info(ti) \
 165         free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
 166
 167 #define __thread_flag_byte_ptr(ti)      \
 168         ((unsigned char *)(&((ti)->flags)))
 169 #define __cur_thread_flag_byte_ptr      __thread_flag_byte_ptr(current_thread_info())
 170
 171 #define get_thread_fault_code()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
 172 #define set_thread_fault_code(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
 173 #define get_thread_wstate()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
 174 #define set_thread_wstate(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
 175 #define get_thread_cwp()                (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
 176 #define set_thread_cwp(val)             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
 177 #define get_thread_current_ds()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
 178 #define set_thread_current_ds(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
 179 #define get_thread_fpdepth()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
 180 #define set_thread_fpdepth(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
 181 #define get_thread_wsaved()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
 182 #define set_thread_wsaved(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
 183
 184 #endif /* !(__ASSEMBLY__) */
 185
 186 /*
 187  * Thread information flags, only 16 bits are available as we encode
 188  * other values into the upper 6 bytes.
 189  *
 190  * On trap return we need to test several values:
 191  *
 192  * user:        need_resched, notify_resume, sigpending, wsaved
 193  * kernel:      fpdepth
 194  *
 195  * So to check for work in the kernel case we simply load the fpdepth
 196  * byte out of the flags and test it.  For the user case we encode the
 197  * lower 3 bytes of flags as follows:
 198  *      ----------------------------------------
 199  *      | wsaved | flags byte 1 | flags byte 2 |
 200  *      ----------------------------------------
 201  * This optimizes the user test into:
 202  *      ldx             [%g6 + TI_FLAGS], REG1
 203  *      sethi           %hi(_TIF_USER_WORK_MASK), REG2
 204  *      or              REG2, %lo(_TIF_USER_WORK_MASK), REG2
 205  *      andcc           REG1, REG2, %g0
 206  *      be,pt           no_work_to_do
 207  *       nop
 208  */
 209 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 210 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 211 #define TIF_SIGPENDING          2       /* signal pending */
 212 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 213 /* flag bit 4 is available */
 214 #define TIF_UNALIGNED           5       /* allowed to do unaligned accesses */
 215 /* flag bit 6 is available */
 216 #define TIF_32BIT               7       /* 32-bit binary */
 217 /* flag bit 8 is available */
 218 #define TIF_SECCOMP             9       /* secure computing */
 219 #define TIF_SYSCALL_AUDIT       10      /* syscall auditing active */
 220 #define TIF_SYSCALL_TRACEPOINT  11      /* syscall tracepoint instrumentation */
 221 /* NOTE: Thread flags >= 12 should be ones we have no interest
 222  *       in using in assembly, else we can't use the mask as
 223  *       an immediate value in instructions such as andcc.
 224  */
 225 /* flag bit 12 is available */
 226 #define TIF_MEMDIE              13      /* is terminating due to OOM killer */
 227 #define TIF_POLLING_NRFLAG      14
 228 #define TIF_FREEZE              15      /* is freezing for suspend */
 229
 230 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 231 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 232 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 233 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 234 #define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
 235 #define _TIF_32BIT              (1<<TIF_32BIT)
 236 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 237 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 238 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
 239 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 240 #define _TIF_FREEZE             (1<<TIF_FREEZE)
 241
 242 #define _TIF_USER_WORK_MASK     ((0xff << TI_FLAG_WSAVED_SHIFT) | \
 243                                  _TIF_DO_NOTIFY_RESUME_MASK | \
 244                                  _TIF_NEED_RESCHED)
 245 #define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
 246
 247 /*
 248  * Thread-synchronous status.
 249  *
 250  * This is different from the flags in that nobody else
 251  * ever touches our thread-synchronous status, so we don't
 252  * have to worry about atomic accesses.
 253  *
 254  * Note that there are only 8 bits available.
 255  */
 256 #define TS_RESTORE_SIGMASK      0x0001  /* restore signal mask in do_signal() */
 257
 258 #ifndef __ASSEMBLY__
 259 #define HAVE_SET_RESTORE_SIGMASK        1
 260 static inline void set_restore_sigmask(void)
 261 {
 262         struct thread_info *ti = current_thread_info();
 263         ti->status |= TS_RESTORE_SIGMASK;
 264         set_bit(TIF_SIGPENDING, &ti->flags);
 265 }
 266 #endif  /* !__ASSEMBLY__ */
 267
 268 #endif /* __KERNEL__ */
 269
 270 #endif /* _ASM_THREAD_INFO_H */