include/asm-sparc64/thread_info.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                    pad;
  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         __u64                   __user *user_cntd0;
  62         __u64                   __user *user_cntd1;
  63         __u64                   kernel_cntd0, kernel_cntd1;
  64         __u64                   pcr_reg;
  65
  66         struct restart_block    restart_block;
  67
  68         struct pt_regs          *kern_una_regs;
  69         unsigned int            kern_una_insn;
  70
  71         unsigned long           fpregs[0] __attribute__ ((aligned(64)));
  72 };
  73
  74 #endif /* !(__ASSEMBLY__) */
  75
  76 /* offsets into the thread_info struct for assembly code access */
  77 #define TI_TASK         0x00000000
  78 #define TI_FLAGS        0x00000008
  79 #define TI_FAULT_CODE   (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
  80 #define TI_WSTATE       (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
  81 #define TI_CWP          (TI_FLAGS + TI_FLAG_BYTE_CWP)
  82 #define TI_CURRENT_DS   (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
  83 #define TI_FPDEPTH      (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
  84 #define TI_WSAVED       (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
  85 #define TI_FPSAVED      0x00000010
  86 #define TI_KSP          0x00000018
  87 #define TI_FAULT_ADDR   0x00000020
  88 #define TI_KREGS        0x00000028
  89 #define TI_EXEC_DOMAIN  0x00000030
  90 #define TI_PRE_COUNT    0x00000038
  91 #define TI_NEW_CHILD    0x0000003c
  92 #define TI_SYS_NOERROR  0x0000003d
  93 #define TI_CPU          0x0000003e
  94 #define TI_UTRAPS       0x00000040
  95 #define TI_REG_WINDOW   0x00000048
  96 #define TI_RWIN_SPTRS   0x000003c8
  97 #define TI_GSR          0x00000400
  98 #define TI_XFSR         0x00000438
  99 #define TI_USER_CNTD0   0x00000470
 100 #define TI_USER_CNTD1   0x00000478
 101 #define TI_KERN_CNTD0   0x00000480
 102 #define TI_KERN_CNTD1   0x00000488
 103 #define TI_PCR          0x00000490
 104 #define TI_RESTART_BLOCK 0x00000498
 105 #define TI_KUNA_REGS    0x000004c0
 106 #define TI_KUNA_INSN    0x000004c8
 107 #define TI_FPREGS       0x00000500
 108
 109 /* We embed this in the uppermost byte of thread_info->flags */
 110 #define FAULT_CODE_WRITE        0x01    /* Write access, implies D-TLB     */
 111 #define FAULT_CODE_DTLB         0x02    /* Miss happened in D-TLB          */
 112 #define FAULT_CODE_ITLB         0x04    /* Miss happened in I-TLB          */
 113 #define FAULT_CODE_WINFIXUP     0x08    /* Miss happened during spill/fill */
 114 #define FAULT_CODE_BLKCOMMIT    0x10    /* Use blk-commit ASI in copy_page */
 115
 116 #if PAGE_SHIFT == 13
 117 #define THREAD_SIZE (2*PAGE_SIZE)
 118 #define THREAD_SHIFT (PAGE_SHIFT + 1)
 119 #else /* PAGE_SHIFT == 13 */
 120 #define THREAD_SIZE PAGE_SIZE
 121 #define THREAD_SHIFT PAGE_SHIFT
 122 #endif /* PAGE_SHIFT == 13 */
 123
 124 #define PREEMPT_ACTIVE          0x4000000
 125
 126 /*
 127  * macros/functions for gaining access to the thread information structure
 128  *
 129  * preempt_count needs to be 1 initially, until the scheduler is functional.
 130  */
 131 #ifndef __ASSEMBLY__
 132
 133 #define INIT_THREAD_INFO(tsk)                           \
 134 {                                                       \
 135         .task           =       &tsk,                   \
 136         .flags          = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT,   \
 137         .exec_domain    =       &default_exec_domain,   \
 138         .preempt_count  =       1,                      \
 139         .restart_block  = {                             \
 140                 .fn     =       do_no_restart_syscall,  \
 141         },                                              \
 142 }
 143
 144 #define init_thread_info        (init_thread_union.thread_info)
 145 #define init_stack              (init_thread_union.stack)
 146
 147 /* how to get the thread information struct from C */
 148 register struct thread_info *current_thread_info_reg asm("g6");
 149 #define current_thread_info()   (current_thread_info_reg)
 150
 151 /* thread information allocation */
 152 #if PAGE_SHIFT == 13
 153 #define __THREAD_INFO_ORDER     1
 154 #else /* PAGE_SHIFT == 13 */
 155 #define __THREAD_INFO_ORDER     0
 156 #endif /* PAGE_SHIFT == 13 */
 157
 158 #ifdef CONFIG_DEBUG_STACK_USAGE
 159 #define alloc_thread_info(tsk)                                  \
 160 ({                                                              \
 161         struct thread_info *ret;                                \
 162                                                                 \
 163         ret = (struct thread_info *)                            \
 164           __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER);    \
 165         if (ret)                                                \
 166                 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
 167         ret;                                                    \
 168 })
 169 #else
 170 #define alloc_thread_info(tsk) \
 171         ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
 172 #endif
 173
 174 #define free_thread_info(ti) \
 175         free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
 176
 177 #define __thread_flag_byte_ptr(ti)      \
 178         ((unsigned char *)(&((ti)->flags)))
 179 #define __cur_thread_flag_byte_ptr      __thread_flag_byte_ptr(current_thread_info())
 180
 181 #define get_thread_fault_code()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
 182 #define set_thread_fault_code(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
 183 #define get_thread_wstate()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
 184 #define set_thread_wstate(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
 185 #define get_thread_cwp()                (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
 186 #define set_thread_cwp(val)             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
 187 #define get_thread_current_ds()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
 188 #define set_thread_current_ds(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
 189 #define get_thread_fpdepth()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
 190 #define set_thread_fpdepth(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
 191 #define get_thread_wsaved()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
 192 #define set_thread_wsaved(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
 193
 194 #endif /* !(__ASSEMBLY__) */
 195
 196 /*
 197  * Thread information flags, only 16 bits are available as we encode
 198  * other values into the upper 6 bytes.
 199  *
 200  * On trap return we need to test several values:
 201  *
 202  * user:        need_resched, notify_resume, sigpending, wsaved, perfctr
 203  * kernel:      fpdepth
 204  *
 205  * So to check for work in the kernel case we simply load the fpdepth
 206  * byte out of the flags and test it.  For the user case we encode the
 207  * lower 3 bytes of flags as follows:
 208  *      ----------------------------------------
 209  *      | wsaved | flags byte 1 | flags byte 2 |
 210  *      ----------------------------------------
 211  * This optimizes the user test into:
 212  *      ldx             [%g6 + TI_FLAGS], REG1
 213  *      sethi           %hi(_TIF_USER_WORK_MASK), REG2
 214  *      or              REG2, %lo(_TIF_USER_WORK_MASK), REG2
 215  *      andcc           REG1, REG2, %g0
 216  *      be,pt           no_work_to_do
 217  *       nop
 218  */
 219 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 220 #define TIF_RESTORE_SIGMASK     1       /* restore signal mask in do_signal() */
 221 #define TIF_SIGPENDING          2       /* signal pending */
 222 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 223 #define TIF_PERFCTR             4       /* performance counters active */
 224 #define TIF_UNALIGNED           5       /* allowed to do unaligned accesses */
 225 /* flag bit 6 is available */
 226 #define TIF_32BIT               7       /* 32-bit binary */
 227 /* flag bit 8 is available */
 228 #define TIF_SECCOMP             9       /* secure computing */
 229 #define TIF_SYSCALL_AUDIT       10      /* syscall auditing active */
 230 /* flag bit 11 is available */
 231 /* NOTE: Thread flags >= 12 should be ones we have no interest
 232  *       in using in assembly, else we can't use the mask as
 233  *       an immediate value in instructions such as andcc.
 234  */
 235 #define TIF_ABI_PENDING         12
 236 #define TIF_MEMDIE              13
 237 #define TIF_POLLING_NRFLAG      14
 238
 239 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 240 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 241 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 242 #define _TIF_PERFCTR            (1<<TIF_PERFCTR)
 243 #define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
 244 #define _TIF_32BIT              (1<<TIF_32BIT)
 245 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 246 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 247 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 248 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
 249 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 250
 251 #define _TIF_USER_WORK_MASK     ((0xff << TI_FLAG_WSAVED_SHIFT) | \
 252                                  (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | \
 253                                   _TIF_NEED_RESCHED | _TIF_PERFCTR))
 254
 255 #endif /* __KERNEL__ */
 256
 257 #endif /* _ASM_THREAD_INFO_H */