From: Jiaxun Yang <jiaxun.yang@flygoat.com>
To: Oleg Nesterov <oleg@redhat.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Andrew Morton <akpm@linux-foundation.org>,
Ben Hutchings <ben@decadent.org.uk>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mips@vger.kernel.org, linux-mm@kvack.org,
Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: [PATCH v2 2/3] MIPS: Clear Cause.BD in instruction_pointer_set
Date: Fri, 02 Feb 2024 12:30:27 +0000 [thread overview]
Message-ID: <20240202-exception_ip-v2-2-e6894d5ce705@flygoat.com> (raw)
In-Reply-To: <20240202-exception_ip-v2-0-e6894d5ce705@flygoat.com>
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>
---
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 701a233583c2..d14d0e37ad02 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
next prev parent reply other threads:[~2024-02-02 12:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-02 12:30 [PATCH v2 0/3] Handle delay slot for extable lookup Jiaxun Yang
2024-02-02 12:30 ` [PATCH v2 1/3] ptrace: Introduce exception_ip arch hook Jiaxun Yang
2024-02-02 12:30 ` Jiaxun Yang [this message]
2024-02-02 12:30 ` [PATCH v2 3/3] mm/memory: Use exception ip to search exception tables Jiaxun Yang
2024-02-02 18:39 ` [PATCH v2 0/3] Handle delay slot for extable lookup Linus Torvalds
2024-02-02 21:31 ` Jiaxun Yang
2024-02-03 13:56 ` Jiaxun Yang
2024-02-04 7:41 ` Linus Torvalds
2024-02-04 11:03 ` Jiaxun Yang
2024-02-04 11:45 ` Linus Torvalds
2024-02-08 9:20 ` Jiaxun Yang
2024-02-08 9:23 ` Xi Ruoyao
2024-02-08 9:31 ` Jiaxun Yang
2024-02-12 22:10 ` Thomas Bogendoerfer
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