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32 results

entry.S

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  • entry.S 4.81 KiB
    /*
     * 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_PREEMPT
    FEXPORT(ret_from_exception)
    	local_irq_disable			# preempt stop
    	b	__ret_from_irq
    #endif
    FEXPORT(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_PREEMPT
    resume_kernel:
    	local_irq_disable
    	lw	t0, TI_PRE_COUNT($28)
    	bnez	t0, restore_all
    need_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_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
    	EMT
    1:
    	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_STATIC
    restore_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	2f
    1:	jal	trace_hardirqs_off
    2:
    	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_notifysig
    work_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_STATIC
    syscall_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 */