thread_info_64.h

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/* thread_info.h: sparc64 low-level thread information
 *
 * Copyright (C) 2002  David S. Miller ([email protected])
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

#define NSWINS      7

#define TI_FLAG_BYTE_FAULT_CODE     0
#define TI_FLAG_FAULT_CODE_SHIFT    56
#define TI_FLAG_BYTE_WSTATE     1
#define TI_FLAG_WSTATE_SHIFT        48
#define TI_FLAG_BYTE_CWP        2
#define TI_FLAG_CWP_SHIFT       40
#define TI_FLAG_BYTE_CURRENT_DS     3
#define TI_FLAG_CURRENT_DS_SHIFT    32
#define TI_FLAG_BYTE_FPDEPTH        4
#define TI_FLAG_FPDEPTH_SHIFT       24
#define TI_FLAG_BYTE_WSAVED     5
#define TI_FLAG_WSAVED_SHIFT        16

#include <asm/page.h>

#ifndef __ASSEMBLY__

#include <asm/ptrace.h>
#include <asm/types.h>

struct task_struct;
struct exec_domain;

struct thread_info {
    /* D$ line 1 */
    struct task_struct  *task;
    unsigned long       flags;
    __u8            fpsaved[7];
    __u8            status;
    unsigned long       ksp;

    /* D$ line 2 */
    unsigned long       fault_address;
    struct pt_regs      *kregs;
    struct exec_domain  *exec_domain;
    int         preempt_count;  /* 0 => preemptable, <0 => BUG */
    __u8            new_child;
    __u8            syscall_noerror;
    __u16           cpu;

    unsigned long       *utraps;

    struct reg_window   reg_window[NSWINS];
    unsigned long       rwbuf_stkptrs[NSWINS];

    unsigned long       gsr[7];
    unsigned long       xfsr[7];

    struct restart_block    restart_block;

    struct pt_regs      *kern_una_regs;
    unsigned int        kern_una_insn;

    unsigned long       fpregs[0] __attribute__ ((aligned(64)));
};

#endif /* !(__ASSEMBLY__) */

/* offsets into the thread_info struct for assembly code access */
#define TI_TASK     0x00000000
#define TI_FLAGS    0x00000008
#define TI_FAULT_CODE   (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
#define TI_WSTATE   (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
#define TI_CWP      (TI_FLAGS + TI_FLAG_BYTE_CWP)
#define TI_CURRENT_DS   (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
#define TI_FPDEPTH  (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
#define TI_WSAVED   (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
#define TI_FPSAVED  0x00000010
#define TI_KSP      0x00000018
#define TI_FAULT_ADDR   0x00000020
#define TI_KREGS    0x00000028
#define TI_EXEC_DOMAIN  0x00000030
#define TI_PRE_COUNT    0x00000038
#define TI_NEW_CHILD    0x0000003c
#define TI_SYS_NOERROR  0x0000003d
#define TI_CPU      0x0000003e
#define TI_UTRAPS   0x00000040
#define TI_REG_WINDOW   0x00000048
#define TI_RWIN_SPTRS   0x000003c8
#define TI_GSR      0x00000400
#define TI_XFSR     0x00000438
#define TI_RESTART_BLOCK 0x00000470
#define TI_KUNA_REGS    0x000004a0
#define TI_KUNA_INSN    0x000004a8
#define TI_FPREGS   0x000004c0

/* We embed this in the uppermost byte of thread_info->flags */
#define FAULT_CODE_WRITE    0x01    /* Write access, implies D-TLB     */
#define FAULT_CODE_DTLB     0x02    /* Miss happened in D-TLB      */
#define FAULT_CODE_ITLB     0x04    /* Miss happened in I-TLB      */
#define FAULT_CODE_WINFIXUP 0x08    /* Miss happened during spill/fill */
#define FAULT_CODE_BLKCOMMIT    0x10    /* Use blk-commit ASI in copy_page */

#if PAGE_SHIFT == 13
#define THREAD_SIZE (2*PAGE_SIZE)
#define THREAD_SHIFT (PAGE_SHIFT + 1)
#else /* PAGE_SHIFT == 13 */
#define THREAD_SIZE PAGE_SIZE
#define THREAD_SHIFT PAGE_SHIFT
#endif /* PAGE_SHIFT == 13 */

#define PREEMPT_ACTIVE      0x10000000

/*
 * macros/functions for gaining access to the thread information structure
 */
#ifndef __ASSEMBLY__

#define INIT_THREAD_INFO(tsk)               \
{                           \
    .task       =   &tsk,           \
    .flags      = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT,   \
    .exec_domain    =   &default_exec_domain,   \
    .preempt_count  =   INIT_PREEMPT_COUNT, \
    .restart_block  = {             \
        .fn =   do_no_restart_syscall,  \
    },                      \
}

#define init_thread_info    (init_thread_union.thread_info)
#define init_stack      (init_thread_union.stack)

/* how to get the thread information struct from C */
register struct thread_info *current_thread_info_reg asm("g6");
#define current_thread_info()   (current_thread_info_reg)

/* thread information allocation */
#if PAGE_SHIFT == 13
#define THREAD_SIZE_ORDER   1
#else /* PAGE_SHIFT == 13 */
#define THREAD_SIZE_ORDER   0
#endif /* PAGE_SHIFT == 13 */

#define __thread_flag_byte_ptr(ti)  \
    ((unsigned char *)(&((ti)->flags)))
#define __cur_thread_flag_byte_ptr  __thread_flag_byte_ptr(current_thread_info())

#define get_thread_fault_code()     (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
#define set_thread_fault_code(val)  (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
#define get_thread_wstate()     (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
#define set_thread_wstate(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
#define get_thread_cwp()        (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
#define set_thread_cwp(val)     (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
#define get_thread_current_ds()     (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
#define set_thread_current_ds(val)  (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
#define get_thread_fpdepth()        (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
#define set_thread_fpdepth(val)     (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
#define get_thread_wsaved()     (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
#define set_thread_wsaved(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))

#endif /* !(__ASSEMBLY__) */

/*
 * Thread information flags, only 16 bits are available as we encode
 * other values into the upper 6 bytes.
 *
 * On trap return we need to test several values:
 *
 * user:    need_resched, notify_resume, sigpending, wsaved
 * kernel:  fpdepth
 *
 * So to check for work in the kernel case we simply load the fpdepth
 * byte out of the flags and test it.  For the user case we encode the
 * lower 3 bytes of flags as follows:
 *  ----------------------------------------
 *  | wsaved | flags byte 1 | flags byte 2 |
 *  ----------------------------------------
 * This optimizes the user test into:
 *  ldx     [%g6 + TI_FLAGS], REG1
 *  sethi       %hi(_TIF_USER_WORK_MASK), REG2
 *  or      REG2, %lo(_TIF_USER_WORK_MASK), REG2
 *  andcc       REG1, REG2, %g0
 *  be,pt       no_work_to_do
 *   nop
 */
#define TIF_SYSCALL_TRACE   0   /* syscall trace active */
#define TIF_NOTIFY_RESUME   1   /* callback before returning to user */
#define TIF_SIGPENDING      2   /* signal pending */
#define TIF_NEED_RESCHED    3   /* rescheduling necessary */
/* flag bit 4 is available */
#define TIF_UNALIGNED       5   /* allowed to do unaligned accesses */
/* flag bit 6 is available */
#define TIF_32BIT       7   /* 32-bit binary */
/* flag bit 8 is available */
#define TIF_SECCOMP     9   /* secure computing */
#define TIF_SYSCALL_AUDIT   10  /* syscall auditing active */
#define TIF_SYSCALL_TRACEPOINT  11  /* syscall tracepoint instrumentation */
/* NOTE: Thread flags >= 12 should be ones we have no interest
 *       in using in assembly, else we can't use the mask as
 *       an immediate value in instructions such as andcc.
 */
/* flag bit 12 is available */
#define TIF_MEMDIE      13  /* is terminating due to OOM killer */
#define TIF_POLLING_NRFLAG  14

#define _TIF_SYSCALL_TRACE  (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME  (1<<TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING     (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED   (1<<TIF_NEED_RESCHED)
#define _TIF_UNALIGNED      (1<<TIF_UNALIGNED)
#define _TIF_32BIT      (1<<TIF_32BIT)
#define _TIF_SECCOMP        (1<<TIF_SECCOMP)
#define _TIF_SYSCALL_AUDIT  (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)

#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
                 _TIF_DO_NOTIFY_RESUME_MASK | \
                 _TIF_NEED_RESCHED)
#define _TIF_DO_NOTIFY_RESUME_MASK  (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)

/*
 * Thread-synchronous status.
 *
 * This is different from the flags in that nobody else
 * ever touches our thread-synchronous status, so we don't
 * have to worry about atomic accesses.
 *
 * Note that there are only 8 bits available.
 */
#define TS_RESTORE_SIGMASK  0x0001  /* restore signal mask in do_signal() */

#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK    1
static inline void set_restore_sigmask(void)
{
    struct thread_info *ti = current_thread_info();
    ti->status |= TS_RESTORE_SIGMASK;
    WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
}
static inline void clear_restore_sigmask(void)
{
    current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
}
static inline bool test_restore_sigmask(void)
{
    return current_thread_info()->status & TS_RESTORE_SIGMASK;
}
static inline bool test_and_clear_restore_sigmask(void)
{
    struct thread_info *ti = current_thread_info();
    if (!(ti->status & TS_RESTORE_SIGMASK))
        return false;
    ti->status &= ~TS_RESTORE_SIGMASK;
    return true;
}

#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)

#define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
#define test_thread_64bit_stack(__SP) \
    ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \
     false : true)

#endif  /* !__ASSEMBLY__ */

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */