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Message-ID: <20210330021624.2b776386@xhacker>
Date: Tue, 30 Mar 2021 02:16:24 +0800
From: Jisheng Zhang <jszhang3@...l.ustc.edu.cn>
To: Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Guo Ren <guoren@...ux.alibaba.com>,
Masami Hiramatsu <mhiramat@...nel.org>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] riscv: keep interrupts disabled for BREAKPOINT exception
From: Jisheng Zhang <jszhang@...nel.org>
Current riscv's kprobe handlers are run with both preemption and
interrupt enabled, this violates kprobe requirements. Fix this issue
by keeping interrupts disabled for BREAKPOINT exception.
Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported")
Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
arch/riscv/kernel/entry.S | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index 744f3209c48d..4114b65698ec 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -130,6 +130,8 @@ skip_context_tracking:
*/
andi t0, s1, SR_PIE
beqz t0, 1f
+ li t0, EXC_BREAKPOINT
+ beq s4, t0, 1f
#ifdef CONFIG_TRACE_IRQFLAGS
call trace_hardirqs_on
#endif
--
2.31.0
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