LXR linux/arch/sparc/include/asm/thread_info

   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
  33struct task_struct;
  34struct exec_domain;
  35
  36struct 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        __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    0x000004c8
 106#define TI_KUNA_INSN    0x000004d0
 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#ifndef __ASSEMBLY__
 130
 131#define INIT_THREAD_INFO(tsk)                           \
 132{                                                       \
 133        .task           =       &tsk,                   \
 134        .flags          = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT,   \
 135        .exec_domain    =       &default_exec_domain,   \
 136        .preempt_count  =       INIT_PREEMPT_COUNT,     \
 137        .restart_block  = {                             \
 138                .fn     =       do_no_restart_syscall,  \
 139        },                                              \
 140}
 141
 142#define init_thread_info        (init_thread_union.thread_info)
 143#define init_stack              (init_thread_union.stack)
 144
 145/* how to get the thread information struct from C */
 146register struct thread_info *current_thread_info_reg asm("g6");
 147#define current_thread_info()   (current_thread_info_reg)
 148
 149/* thread information allocation */
 150#if PAGE_SHIFT == 13
 151#define __THREAD_INFO_ORDER     1
 152#else /* PAGE_SHIFT == 13 */
 153#define __THREAD_INFO_ORDER     0
 154#endif /* PAGE_SHIFT == 13 */
 155
 156#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
 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_NOTIFY_RESUME       1       /* callback before returning to user */
 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#define TIF_FREEZE              15      /* is freezing for suspend */
 239
 240#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 241#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 242#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 243#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 244#define _TIF_PERFCTR            (1<<TIF_PERFCTR)
 245#define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
 246#define _TIF_32BIT              (1<<TIF_32BIT)
 247#define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 248#define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 249#define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
 250#define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 251#define _TIF_FREEZE             (1<<TIF_FREEZE)
 252
 253#define _TIF_USER_WORK_MASK     ((0xff << TI_FLAG_WSAVED_SHIFT) | \
 254                                 _TIF_DO_NOTIFY_RESUME_MASK | \
 255                                 _TIF_NEED_RESCHED | _TIF_PERFCTR)
 256#define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
 257
 258/*
 259 * Thread-synchronous status.
 260 *
 261 * This is different from the flags in that nobody else
 262 * ever touches our thread-synchronous status, so we don't
 263 * have to worry about atomic accesses.
 264 *
 265 * Note that there are only 8 bits available.
 266 */
 267#define TS_RESTORE_SIGMASK      0x0001  /* restore signal mask in do_signal() */
 268
 269#ifndef __ASSEMBLY__
 270#define HAVE_SET_RESTORE_SIGMASK        1
 271static inline void set_restore_sigmask(void)
 272{
 273        struct thread_info *ti = current_thread_info();
 274        ti->status |= TS_RESTORE_SIGMASK;
 275        set_bit(TIF_SIGPENDING, &ti->flags);
 276}
 277#endif  /* !__ASSEMBLY__ */
 278
 279#endif /* __KERNEL__ */
 280
 281#endif /* _ASM_THREAD_INFO_H */
 282