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/*
* 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.
*
* Low level exception handling
*
* Copyright (C) 1994 - 2000, 2001 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics
* Copyright (C) 2001 MIPS Technologies, Inc.
*/
#include <linux/config.h>
#include <asm/asm.h>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/stackframe.h>
/* This duplicates the definition from <linux/sched.h> */
#define PT_TRACESYS 0x00000002 /* tracing system calls */
#define KU_USER 0x10
.text
.align 4
FEXPORT(ret_from_fork)
move a0, v0 # prev
jal schedule_tail
lw t0, TASK_PTRACE($28) # syscall tracing enabled?
andi t0, PT_TRACESYS
bnez t0, tracesys_exit
j ret_from_sys_call
tracesys_exit:
jal syscall_trace
b ret_from_sys_call
EXPORT(ret_from_irq)
EXPORT(ret_from_exception)
lw t0, PT_STATUS(sp) # returning to kernel mode?
andi t0, t0, KU_USER
bnez t0, ret_from_sys_call
j restore_all
reschedule: jal schedule
FEXPORT(ret_from_sys_call)
mfc0 t0, CP0_STATUS # need_resched and signals atomic test
ori t0, t0, 1
xori t0, t0, 1
mtc0 t0, CP0_STATUS
ld v0, TASK_NEED_RESCHED($28)
lw v1, TASK_SIGPENDING($28)
bnez v0, reschedule
bnez v1, signal_return
restore_all: .set noat
RESTORE_ALL
eret
.set at
signal_return: .type signal_return, @function
mfc0 t0, CP0_STATUS
ori t0, t0, 1
mtc0 t0, CP0_STATUS
move a0, zero
move a1, sp
jal do_signal
b restore_all
/*
* Common spurious interrupt handler.
*/
.text
.align 5
LEAF(spurious_interrupt)
/*
* Someone tried to fool us by sending an interrupt but we
* couldn't find a cause for it.
*/
lui t1,%hi(spurious_count)
lw t0,%lo(spurious_count)(t1)
addiu t0,1
sw t0,%lo(spurious_count)(t1)
j ret_from_irq
END(spurious_interrupt)
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