diff options
| author | Bibo Mao <maobibo@loongson.cn> | 2025-11-27 11:00:18 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2025-11-27 11:00:18 +0800 |
| commit | 985a96983bedf04fa61315e68806f3468450c8a1 (patch) | |
| tree | e23c2b201513f759f71a2e80e5eb64bb44b544da /tools/testing/selftests/kvm/lib | |
| parent | d3e43a1f34acbb9a814337fc5624765538e5a274 (diff) | |
KVM: LoongArch: selftests: Add system registers save/restore on exception
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>
Diffstat (limited to 'tools/testing/selftests/kvm/lib')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/loongarch/exception.S | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/lib/loongarch/exception.S b/tools/testing/selftests/kvm/lib/loongarch/exception.S index 88bfa505c6f5..3f1e4b67c5ae 100644 --- a/tools/testing/selftests/kvm/lib/loongarch/exception.S +++ b/tools/testing/selftests/kvm/lib/loongarch/exception.S @@ -51,9 +51,15 @@ handle_exception: st.d t0, sp, ESTAT_OFFSET_EXREGS csrrd t0, LOONGARCH_CSR_BADV st.d t0, sp, BADV_OFFSET_EXREGS + csrrd t0, LOONGARCH_CSR_PRMD + st.d t0, sp, PRMD_OFFSET_EXREGS or a0, sp, zero bl route_exception + ld.d t0, sp, PC_OFFSET_EXREGS + csrwr t0, LOONGARCH_CSR_ERA + ld.d t0, sp, PRMD_OFFSET_EXREGS + csrwr t0, LOONGARCH_CSR_PRMD restore_gprs sp csrrd sp, LOONGARCH_CSR_KS0 ertn |