477654fc5d
Found by Chris Dearman (chris@mips.com). Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
171 lines
3.9 KiB
ArmAsm
171 lines
3.9 KiB
ArmAsm
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2001 MIPS Technologies, Inc.
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*/
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#include <linux/config.h>
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/regdef.h>
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#include <asm/mipsregs.h>
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#include <asm/stackframe.h>
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#include <asm/isadep.h>
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#include <asm/thread_info.h>
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#include <asm/war.h>
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#ifdef CONFIG_MIPS_MT_SMTC
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#include <asm/mipsmtregs.h>
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#endif
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#ifdef CONFIG_PREEMPT
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.macro preempt_stop
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.endm
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#else
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.macro preempt_stop
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local_irq_disable
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.endm
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#define resume_kernel restore_all
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#endif
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.text
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.align 5
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FEXPORT(ret_from_exception)
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preempt_stop
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FEXPORT(ret_from_irq)
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LONG_L t0, PT_STATUS(sp) # returning to kernel mode?
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andi t0, t0, KU_USER
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beqz t0, resume_kernel
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resume_userspace:
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local_irq_disable # make sure we dont miss an
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# interrupt setting need_resched
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# between sampling and return
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LONG_L a2, TI_FLAGS($28) # current->work
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andi t0, a2, _TIF_WORK_MASK # (ignoring syscall_trace)
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bnez t0, work_pending
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j restore_all
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#ifdef CONFIG_PREEMPT
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resume_kernel:
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local_irq_disable
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lw t0, TI_PRE_COUNT($28)
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bnez t0, restore_all
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need_resched:
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LONG_L t0, TI_FLAGS($28)
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andi t1, t0, _TIF_NEED_RESCHED
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beqz t1, restore_all
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LONG_L t0, PT_STATUS(sp) # Interrupts off?
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andi t0, 1
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beqz t0, restore_all
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jal preempt_schedule_irq
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b need_resched
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#endif
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FEXPORT(ret_from_fork)
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jal schedule_tail # a0 = task_t *prev
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FEXPORT(syscall_exit)
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local_irq_disable # make sure need_resched and
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# signals dont change between
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# sampling and return
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LONG_L a2, TI_FLAGS($28) # current->work
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li t0, _TIF_ALLWORK_MASK
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and t0, a2, t0
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bnez t0, syscall_exit_work
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FEXPORT(restore_all) # restore full frame
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#ifdef CONFIG_MIPS_MT_SMTC
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/* Detect and execute deferred IPI "interrupts" */
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move a0,sp
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jal deferred_smtc_ipi
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/* Re-arm any temporarily masked interrupts not explicitly "acked" */
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mfc0 v0, CP0_TCSTATUS
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ori v1, v0, TCSTATUS_IXMT
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mtc0 v1, CP0_TCSTATUS
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andi v0, TCSTATUS_IXMT
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ehb
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mfc0 t0, CP0_TCCONTEXT
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DMT 9 # dmt t1
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jal mips_ihb
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mfc0 t2, CP0_STATUS
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andi t3, t0, 0xff00
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or t2, t2, t3
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mtc0 t2, CP0_STATUS
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ehb
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andi t1, t1, VPECONTROL_TE
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beqz t1, 1f
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EMT
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1:
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mfc0 v1, CP0_TCSTATUS
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/* We set IXMT above, XOR should clear it here */
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xori v1, v1, TCSTATUS_IXMT
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or v1, v0, v1
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mtc0 v1, CP0_TCSTATUS
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ehb
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xor t0, t0, t3
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mtc0 t0, CP0_TCCONTEXT
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#endif /* CONFIG_MIPS_MT_SMTC */
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.set noat
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RESTORE_TEMP
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RESTORE_AT
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RESTORE_STATIC
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FEXPORT(restore_partial) # restore partial frame
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RESTORE_SOME
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RESTORE_SP_AND_RET
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.set at
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work_pending:
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andi t0, a2, _TIF_NEED_RESCHED # a2 is preloaded with TI_FLAGS
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beqz t0, work_notifysig
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work_resched:
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jal schedule
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local_irq_disable # make sure need_resched and
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# signals dont change between
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# sampling and return
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LONG_L a2, TI_FLAGS($28)
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andi t0, a2, _TIF_WORK_MASK # is there any work to be done
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# other than syscall tracing?
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beqz t0, restore_all
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andi t0, a2, _TIF_NEED_RESCHED
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bnez t0, work_resched
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work_notifysig: # deal with pending signals and
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# notify-resume requests
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move a0, sp
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li a1, 0
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jal do_notify_resume # a2 already loaded
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j resume_userspace
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FEXPORT(syscall_exit_work_partial)
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SAVE_STATIC
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syscall_exit_work:
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li t0, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
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and t0, a2 # a2 is preloaded with TI_FLAGS
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beqz t0, work_pending # trace bit set?
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local_irq_enable # could let do_syscall_trace()
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# call schedule() instead
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move a0, sp
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li a1, 1
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jal do_syscall_trace
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b resume_userspace
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#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_MIPS_MT)
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/*
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* MIPS32R2 Instruction Hazard Barrier - must be called
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*
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* For C code use the inline version named instruction_hazard().
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*/
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LEAF(mips_ihb)
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.set mips32r2
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jr.hb ra
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nop
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END(mips_ihb)
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#endif /* CONFIG_CPU_MIPSR2 or CONFIG_MIPS_MT */
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