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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 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics */ #include <linux/config.h> #include <asm/asm.h> #include <asm/regdef.h> #include <asm/mipsregs.h> #include <asm/stackframe.h> .text .set noreorder .align 4 FEXPORT(ret_from_fork) jal schedule_tail move a0, v0 # prev j ret_from_sys_call nop FEXPORT(handle_softirq) jal do_softirq nop b 9f nop reschedule: jal schedule nop FEXPORT(ret_from_sys_call) FEXPORT(ret_from_irq) la t1, irq_stat # softirq_active #ifdef CONFIG_SMP lwu t0, TASK_PROCESSOR($28) dsll t0, t0, 5 daddu t1, t0 #endif lw t0, 0 (t1) # softirq_active lw t1, 4 (t1) # softirq_mask. unused delay slot and t0, t1 bnez t0, handle_softirq 9: ld t0, PT_STATUS(sp) # returning to kernel mode? andi t1, t0, 0x10 beqz t1, return # -> yes ld t1, TASK_NEED_RESCHED($28) bnez t1, reschedule lw v0, TASK_SIGPENDING($28) move a0, zero beqz v0, return nop jal do_signal move a1, sp FEXPORT(return) .set noat RESTORE_ALL eret .set at /* * 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 j ret_from_irq sw t0,%lo(spurious_count)(t1) END(spurious_interrupt) |