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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [mips64/] [kernel/] [entry.S] - Blame information for rev 1275

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Line No. Rev Author Line
1 1275 phoenix 
/*
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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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 * Low level exception handling
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 *
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 * Copyright (C) 1994 - 2000, 2001 Ralf Baechle
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 * Copyright (C) 1999, 2000 Silicon Graphics
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 * Copyright (C) 2001 MIPS Technologies, Inc.
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 */
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#include
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#include
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#include
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#include
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#include
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#define KU_USER 0x10
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                .text
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                .align  5
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FEXPORT(ret_from_fork)
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                move    a0, v0                  # prev
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                jal     schedule_tail
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                ld      t0, TASK_PTRACE($28)    # syscall tracing enabled?
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                andi    t0, _PT_TRACESYS
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                bnez    t0, tracesys_exit
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                j       ret_from_sys_call
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tracesys_exit:
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                jal     syscall_trace
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                b       ret_from_sys_call
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EXPORT(ret_from_irq)
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EXPORT(ret_from_exception)
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                ld      t0, PT_STATUS(sp)       # returning to kernel mode?
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                andi    t0, t0, KU_USER
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                bnez    t0, ret_from_sys_call
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                j       restore_all
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reschedule:     jal     schedule
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FEXPORT(ret_from_sys_call)
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                mfc0    t0, CP0_STATUS  # need_resched and signals atomic test
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                ori     t0, t0, 1
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                xori    t0, t0, 1
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                mtc0    t0, CP0_STATUS
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                SSNOP; SSNOP; SSNOP
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                ld      v0, TASK_NEED_RESCHED($28)
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                lw      v1, TASK_SIGPENDING($28)
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                bnez    v0, reschedule
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                bnez    v1, signal_return
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restore_all:    .set    noat
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                RESTORE_ALL
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                eret
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                .set    at
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signal_return:  .type   signal_return, @function
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                mfc0    t0, CP0_STATUS
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                ori     t0, t0, 1
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                mtc0    t0, CP0_STATUS
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                move    a0, zero
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                move    a1, sp
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                jal     do_signal
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                b       restore_all
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/*
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 * Common spurious interrupt handler.
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 */
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                .text
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                .align  5
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LEAF(spurious_interrupt)
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                /*
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                 * Someone tried to fool us by sending an interrupt but we
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                 * couldn't find a cause for it.
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                 */
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                lui     t1, %hi(irq_err_count)
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1:              ll      t0, %lo(irq_err_count)(t1)
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                addiu   t0, 1
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                sc      t0, %lo(irq_err_count)(t1)
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                beqz    t0, 1b
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                j       ret_from_irq
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                END(spurious_interrupt)

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