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        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 */
 136register 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
 260static 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 */
 271