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[MIPS] ret_from_irq adjustment

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Make sure that RA on top of interrupt stack is an address of ret_from_irq,
so that dump_stack etc. can trace info interrupted context.

Also this patch fixes except_vec_vi_handler and __smtc_ipi_vector which
seems broken.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto
2006-10-09 01:24:23 +09:00
committed by Ralf Baechle
parent 441ee341ad
commit f431baa55a
4 changed files with 19 additions and 23 deletions
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14
arch/mips/kernel/entry.S
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@@ -20,10 +20,7 @@
#include <asm/mipsmtregs.h>
#endif
#ifdef CONFIG_PREEMPT
.macro preempt_stop
.endm
#else
#ifndef CONFIG_PREEMPT
.macro preempt_stop
local_irq_disable
.endm
@@ -32,9 +29,16 @@
.text
.align 5
FEXPORT(ret_from_irq)
LONG_S s0, TI_REGS($28)
#ifdef CONFIG_PREEMPT
FEXPORT(ret_from_exception)
#else
b _ret_from_irq
FEXPORT(ret_from_exception)
preempt_stop
FEXPORT(ret_from_irq)
#endif
FEXPORT(_ret_from_irq)
LONG_L t0, PT_STATUS(sp) # returning to kernel mode?
andi t0, t0, KU_USER
beqz t0, resume_kernel