- 根目录:
- arch
- sparc
- include
- asm
- thread_info_64.h
/* thread_info.h: sparc64 low-level thread information
*
* Copyright (C) 2002 David S. Miller (davem@redhat.com)
*/
#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_NOERROR 2
#define TI_FLAG_BYTE_NOERROR_SHIFT 40
#define TI_FLAG_BYTE_FPDEPTH 3
#define TI_FLAG_FPDEPTH_SHIFT 32
#define TI_FLAG_BYTE_CWP 4
#define TI_FLAG_CWP_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 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;
int preempt_count; /* 0 => preemptable, <0 => BUG */
__u8 new_child;
__u8 current_ds;
__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 pt_regs *kern_una_regs;
unsigned int kern_una_insn;
unsigned long fpregs[(7 * 256) / sizeof(unsigned long)]
__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_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
#define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
#define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
#define TI_FPSAVED 0x00000010
#define TI_KSP 0x00000018
#define TI_FAULT_ADDR 0x00000020
#define TI_KREGS 0x00000028
#define TI_PRE_COUNT 0x00000030
#define TI_NEW_CHILD 0x00000034
#define TI_CURRENT_DS 0x00000035
#define TI_CPU 0x00000036
#define TI_UTRAPS 0x00000038
#define TI_REG_WINDOW 0x00000040
#define TI_RWIN_SPTRS 0x000003c0
#define TI_GSR 0x000003f8
#define TI_XFSR 0x00000430
#define TI_KUNA_REGS 0x00000468
#define TI_KUNA_INSN 0x00000470
#define TI_FPREGS 0x00000480
/* 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 */
#define FAULT_CODE_BAD_RA 0x20 /* Bad RA for sun4v */
#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 */
/*
* macros/functions for gaining access to the thread information structure
*/
#ifndef __ASSEMBLY__
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.current_ds = ASI_P, \
.preempt_count = INIT_PREEMPT_COUNT, \
}
#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_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
#define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (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 */
#define TIF_NOHZ 8 /* in adaptive nohz mode */
#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_NOHZ (1<<TIF_NOHZ)
#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)
#define is_32bit_task() (test_thread_flag(TIF_32BIT))
/*
* 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 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 */