/* * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 2001 MIPS Technologies, Inc. */ #include <asm/asm.h>#include <asm/asmmacro.h>#include <asm/regdef.h>#include <asm/mipsregs.h>#include <asm/stackframe.h>#include <asm/isadep.h>#include <asm/thread_info.h>#include <asm/war.h>#ifdef CONFIG_MIPS_MT_SMTC#include <asm/mipsmtregs.h>#endif #ifndef CONFIG_PREEMPT#define resume_kernel	restore_all#else#define __ret_from_irq	ret_from_exception#endif 	.text	.align	5#ifndef CONFIG_PREEMPTFEXPORT(ret_from_exception)	local_irq_disable			# preempt stop	b	__ret_from_irq#endifFEXPORT(ret_from_irq)	LONG_S	s0, TI_REGS($28)FEXPORT(__ret_from_irq)/* * We can be coming here from a syscall done in the kernel space, * e.g. a failed kernel_execve(). */resume_userspace_check:	LONG_L	t0, PT_STATUS(sp)		# returning to kernel mode?	andi	t0, t0, KU_USER	beqz	t0, resume_kernel resume_userspace:	local_irq_disable		# make sure we dont miss an					# interrupt setting need_resched					# between sampling and return	LONG_L	a2, TI_FLAGS($28)	# current->work	andi	t0, a2, _TIF_WORK_MASK	# (ignoring syscall_trace)	bnez	t0, work_pending	j	restore_all #ifdef CONFIG_PREEMPTresume_kernel:	local_irq_disable	lw	t0, TI_PRE_COUNT($28)	bnez	t0, restore_allneed_resched:	LONG_L	t0, TI_FLAGS($28)	andi	t1, t0, _TIF_NEED_RESCHED	beqz	t1, restore_all	LONG_L	t0, PT_STATUS(sp)		# Interrupts off?	andi	t0, 1	beqz	t0, restore_all	jal	preempt_schedule_irq	b	need_resched#endif FEXPORT(ret_from_kernel_thread)	jal	schedule_tail		# a0 = struct task_struct *prev	move	a0, s1	jal	s0	j	syscall_exit FEXPORT(ret_from_fork)	jal	schedule_tail		# a0 = struct task_struct *prev FEXPORT(syscall_exit)	local_irq_disable		# make sure need_resched and					# signals dont change between					# sampling and return	LONG_L	a2, TI_FLAGS($28)	# current->work	li	t0, _TIF_ALLWORK_MASK	and	t0, a2, t0	bnez	t0, syscall_exit_work restore_all:				# restore full frame#ifdef CONFIG_MIPS_MT_SMTC#ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP/* Re-arm any temporarily masked interrupts not explicitly "acked" */	mfc0	v0, CP0_TCSTATUS	ori	v1, v0, TCSTATUS_IXMT	mtc0	v1, CP0_TCSTATUS	andi	v0, TCSTATUS_IXMT	_ehb	mfc0	t0, CP0_TCCONTEXT	DMT	9				# dmt t1	jal	mips_ihb	mfc0	t2, CP0_STATUS	andi	t3, t0, 0xff00	or	t2, t2, t3	mtc0	t2, CP0_STATUS	_ehb	andi	t1, t1, VPECONTROL_TE	beqz	t1, 1f	EMT1:	mfc0	v1, CP0_TCSTATUS	/* We set IXMT above, XOR should clear it here */	xori	v1, v1, TCSTATUS_IXMT	or	v1, v0, v1	mtc0	v1, CP0_TCSTATUS	_ehb	xor	t0, t0, t3	mtc0	t0, CP0_TCCONTEXT#endif /* CONFIG_MIPS_MT_SMTC_IM_BACKSTOP *//* Detect and execute deferred IPI "interrupts" */	LONG_L	s0, TI_REGS($28)	LONG_S	sp, TI_REGS($28)	jal	deferred_smtc_ipi	LONG_S	s0, TI_REGS($28)#endif /* CONFIG_MIPS_MT_SMTC */	.set	noat	RESTORE_TEMP	RESTORE_AT	RESTORE_STATICrestore_partial:		# restore partial frame#ifdef CONFIG_TRACE_IRQFLAGS	SAVE_STATIC	SAVE_AT	SAVE_TEMP	LONG_L	v0, PT_STATUS(sp)#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)	and	v0, ST0_IEP#else	and	v0, ST0_IE#endif	beqz	v0, 1f	jal	trace_hardirqs_on	b	2f1:	jal	trace_hardirqs_off2:	RESTORE_TEMP	RESTORE_AT	RESTORE_STATIC#endif	RESTORE_SOME	RESTORE_SP_AND_RET	.set	at work_pending:	andi	t0, a2, _TIF_NEED_RESCHED # a2 is preloaded with TI_FLAGS	beqz	t0, work_notifysigwork_resched:	jal	schedule 	local_irq_disable		# make sure need_resched and					# signals dont change between					# sampling and return	LONG_L	a2, TI_FLAGS($28)	andi	t0, a2, _TIF_WORK_MASK	# is there any work to be done					# other than syscall tracing?	beqz	t0, restore_all	andi	t0, a2, _TIF_NEED_RESCHED	bnez	t0, work_resched work_notifysig:				# deal with pending signals and					# notify-resume requests	move	a0, sp	li	a1, 0	jal	do_notify_resume	# a2 already loaded	j	resume_userspace_check FEXPORT(syscall_exit_partial)	local_irq_disable		# make sure need_resched doesn't					# change between and return	LONG_L	a2, TI_FLAGS($28)	# current->work	li	t0, _TIF_ALLWORK_MASK	and	t0, a2	beqz	t0, restore_partial	SAVE_STATICsyscall_exit_work:	LONG_L	t0, PT_STATUS(sp)		# returning to kernel mode?	andi	t0, t0, KU_USER	beqz	t0, resume_kernel	li	t0, _TIF_WORK_SYSCALL_EXIT	and	t0, a2			# a2 is preloaded with TI_FLAGS	beqz	t0, work_pending	# trace bit set?	local_irq_enable		# could let syscall_trace_leave()					# call schedule() instead	move	a0, sp	jal	syscall_trace_leave	b	resume_userspace #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_MIPS_MT) /* * MIPS32R2 Instruction Hazard Barrier - must be called * * For C code use the inline version named instruction_hazard(). */LEAF(mips_ihb)	.set	mips32r2	jr.hb	ra	nop	END(mips_ihb) #endif /* CONFIG_CPU_MIPSR2 or CONFIG_MIPS_MT */