linux-2.6.33/ret_fast_syscall()(arm) の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-2.6.33/ret_fast_syscall()(arm) へ行く。
  • 1 (2011-01-19 (水) 21:20:20)

参照元†

• linux-2.6.33/ret_fast_syscall()

説明†

• パス: [[linux-2.6.33/]]

• FIXME: これは何？
  • 説明

引数†

返り値†

参考†

実装†

	.align	5
/*
 * This is the fast syscall return path.  We do as little as
 * possible here, and this includes saving r0 back into the SVC
 * stack.
 */
ret_fast_syscall:
 UNWIND(.fnstart	)
 UNWIND(.cantunwind	)

• • linux-2.6.33/UNWIND()

	disable_irq				@ disable interrupts

• • linux-2.6.33/disable_irq()

	ldr	r1, [tsk, #TI_FLAGS]
	tst	r1, #_TIF_WORK_MASK
	bne	fast_work_pending

• • linux-2.6.33/fast_work_pending()

	/* perform architecture specific actions before user return */
	arch_ret_to_user r1, lr

• • linux-2.6.33/arch_ret_to_user()

	restore_user_regs fast = 1, offset = S_OFF
 UNWIND(.fnend		)

• • linux-2.6.33/restore_user_regs()

/*
 * Ok, we need to do extra processing, enter the slow path.
 */
fast_work_pending:
	str	r0, [sp, #S_R0+S_OFF]!		@ returned r0
work_pending:
	tst	r1, #_TIF_NEED_RESCHED
	bne	work_resched

• • linux-2.6.33/work_resched()

	tst	r1, #_TIF_SIGPENDING|_TIF_NOTIFY_RESUME
	beq	no_work_pending

• • linux-2.6.33/no_work_pending()

	mov	r0, sp				@ 'regs'
	mov	r2, why				@ 'syscall'
	bl	do_notify_resume

• • linux-2.6.33/do_notify_resume()

	b	ret_slow_syscall		@ Check work again

• • linux-2.6.33/ret_slow_syscall()

work_resched:
	bl	schedule

• • linux-2.6.33/schedule()

コメント†