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Subject[PATCH] riscv: uprobes: Restore thread.bad_cause
Date
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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