* [PATCH AUTOSEL 5.4 4/5] MIPS: Clear Cause.BD in instruction_pointer_set
[not found] <20240229155127.2851327-1-sashal@kernel.org>
@ 2024-02-29 15:51 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2024-02-29 15:51 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Jiaxun Yang, Thomas Bogendoerfer, Sasha Levin, oleg, linux-mips
From: Jiaxun Yang <jiaxun.yang@flygoat.com>
[ Upstream commit 9d6e21ddf20293b3880ae55b9d14de91c5891c59 ]
Clear Cause.BD after we use instruction_pointer_set to override
EPC.
This can prevent exception_epc check against instruction code at
new return address.
It won't be considered as "in delay slot" after epc being overridden
anyway.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/mips/include/asm/ptrace.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/ptrace.h
index 1e76774b36ddf..2849a9b65a055 100644
--- a/arch/mips/include/asm/ptrace.h
+++ b/arch/mips/include/asm/ptrace.h
@@ -60,6 +60,7 @@ static inline void instruction_pointer_set(struct pt_regs *regs,
unsigned long val)
{
regs->cp0_epc = val;
+ regs->cp0_cause &= ~CAUSEF_BD;
}
/* Query offset/name of register from its name/offset */
--
2.43.0
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2024-02-29 15:51 ` [PATCH AUTOSEL 5.4 4/5] MIPS: Clear Cause.BD in instruction_pointer_set Sasha Levin
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