[PATCH] riscv: uprobes: Restore thread.bad_cause

From: Tiezhu Yang <yangtiezhu@loongson.cn>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Cc: Guo Ren <guoren@kernel.org>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	loongson-kernel@lists.loongnix.cn
Subject: [PATCH] riscv: uprobes: Restore thread.bad_cause
Date: Sun, 23 Apr 2023 09:42:26 +0800	[thread overview]
Message-ID: <1682214146-3756-1-git-send-email-yangtiezhu@loongson.cn> (raw)

thread.bad_cause is saved in arch_uprobe_pre_xol(), it should be restored
in arch_uprobe_{post,abort}_xol() accordingly, otherwise the save operation
is meaningless, this change is similar with x86 and powerpc.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 arch/riscv/kernel/probes/uprobes.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/kernel/probes/uprobes.c b/arch/riscv/kernel/probes/uprobes.c
index c976a21..194f166 100644
--- a/arch/riscv/kernel/probes/uprobes.c
+++ b/arch/riscv/kernel/probes/uprobes.c
@@ -67,6 +67,7 @@ int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
 	struct uprobe_task *utask = current->utask;
 
 	WARN_ON_ONCE(current->thread.bad_cause != UPROBE_TRAP_NR);
+	current->thread.bad_cause = utask->autask.saved_cause;
 
 	instruction_pointer_set(regs, utask->vaddr + auprobe->insn_size);
 
@@ -102,6 +103,7 @@ void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
 {
 	struct uprobe_task *utask = current->utask;
 
+	current->thread.bad_cause = utask->autask.saved_cause;
 	/*
 	 * Task has received a fatal signal, so reset back to probbed
 	 * address.
-- 
2.1.0


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