KVM: LoongArch: selftests: Add system registers save/restore on exception

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When system returns from exception with ertn instruction, PC comes from
LOONGARCH_CSR_ERA, and CSR.CRMD comes LOONGARCH_CSR_PRMD.

Here save CSR register CSR.ERA and CSR.PRMD into stack, and then restore
them from stack. So it can be modified by exception handlers in future.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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Bibo Mao 2025-11-27 11:00:18 +08:00 • committed by Huacai Chen

parent d3e43a1f34

commit 985a96983b

2 changed files with 10 additions and 1 deletions

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5

tools/testing/selftests/kvm/include/loongarch/processor.h

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6

tools/testing/selftests/kvm/lib/loongarch/exception.S

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