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LoongArch: Fix oops during single-step debugging

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When entering KDB via a breakpoint and then performing single-step
debugging, an oops is triggered. Now during single-step debugging,
kdb_local() expects the reason to be KDB_REASON_SSTEP, but it is
actually KDB_REASON_OOPS. In kdb_stub(), when determining the reason,
the ex_vector for single-step should be 0, as already implemented on
other architectures such as arm64 and riscv.

Before the patch:
[112]kdb> ss

Entering kdb (current=0x900020009f520000, pid 10661) on
processor 112 Oops: (null)
due to oops @ 0x90000000005b57a4

Cc: stable@vger.kernel.org
Signed-off-by: Haoran Jiang <jianghaoran@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Haoran Jiang 2026-07-23 22:27:30 +08:00 committed by Huacai Chen
parent 485ed44db5
commit 73555fdab5
1 changed files with 2 additions and 1 deletions
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3
arch/loongarch/kernel/kgdb.c
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@ -252,7 +252,8 @@ static int kgdb_loongarch_notify(struct notifier_block *self, unsigned long cmd,
if (atomic_read(&kgdb_active) != -1)
kgdb_nmicallback(smp_processor_id(), regs);
if (kgdb_handle_exception(args->trapnr, args->signr, cmd, regs))
if (kgdb_handle_exception(regs->csr_era == stepped_address ? 0 : args->trapnr,
args->signr, cmd, regs))
return NOTIFY_DONE;
if (atomic_read(&kgdb_setting_breakpoint))