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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>
This commit is contained in:
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
View File

@@ -124,18 +124,21 @@ struct ex_regs {
unsigned long pc;
unsigned long estat;
unsigned long badv;
unsigned long prmd;
};
#define PC_OFFSET_EXREGS offsetof(struct ex_regs, pc)
#define ESTAT_OFFSET_EXREGS offsetof(struct ex_regs, estat)
#define BADV_OFFSET_EXREGS offsetof(struct ex_regs, badv)
#define PRMD_OFFSET_EXREGS offsetof(struct ex_regs, prmd)
#define EXREGS_SIZE sizeof(struct ex_regs)
#else
#define PC_OFFSET_EXREGS ((EXREGS_GPRS + 0) * 8)
#define ESTAT_OFFSET_EXREGS ((EXREGS_GPRS + 1) * 8)
#define BADV_OFFSET_EXREGS ((EXREGS_GPRS + 2) * 8)
#define EXREGS_SIZE ((EXREGS_GPRS + 3) * 8)
#define PRMD_OFFSET_EXREGS ((EXREGS_GPRS + 3) * 8)
#define EXREGS_SIZE ((EXREGS_GPRS + 4) * 8)
#endif
#endif /* SELFTEST_KVM_PROCESSOR_H */

6
tools/testing/selftests/kvm/lib/loongarch/exception.S
View File

@@ -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