This patch adds emulation support for the rlwimi instruction.
Signed-off-by: Alexander Graf <agraf@xxxxxxx>
---
arch/powerpc/include/asm/ppc-opcode.h | 1 +
arch/powerpc/kvm/emulate.c | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index 1e80fd2..569b518 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -119,6 +119,7 @@
#define OP_CMPI 11
#define OP_ADDIS 15
#define OP_BC 16
+#define OP_RLWIMI 20
#define OP_ORI 24
#define OP_ORIS 25
#define OP_ANDI 28
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 47b1de8..c40f255 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -601,6 +601,37 @@ int kvmppc_emulate_rld(struct kvm_vcpu *vcpu, u32 inst)
return EMULATE_DONE;
}
+int kvmppc_emulate_rlwimi(struct kvm_vcpu *vcpu, u32 inst)
+{
+ int sh = (inst >> 11) & 0x1f;
+ int mb = (inst >> 6) & 0x1f;
+ int me = (inst >> 1) & 0x1f;
+ u32 source = kvmppc_get_gpr(vcpu, get_rs(inst));
+ u32 dest = source;
+ u32 mask;
+
+ if (sh)
+ dest = (source << sh) | (source >> (32 - sh));
+
+ if (!mb)
+ mask = (u32)-1 << (31 - me);
+ else if (me == 31)
+ mask = (u32)-1 >> mb;
+ else {
+ mask = ((u32)-1 >> mb) ^ (((u32)-1 >> me) >> 1);
+ if (mb > me)
+ mask = ~mask;
+ }
+ dest &= mask;
+ dest |= kvmppc_get_gpr(vcpu, get_ra(inst)) & ~mask;
+
+ kvmppc_set_gpr(vcpu, get_ra(inst), dest);
+ if (get_rc(inst))
+ kvmppc_emulate_cmp(vcpu, dest, 0, true, 0, true);
+
+ return EMULATE_DONE;
+}
+
/* Emulates privileged and non-privileged instructions */
int kvmppc_emulate_any_instruction(struct kvm_vcpu *vcpu)
{
@@ -675,6 +706,9 @@ int kvmppc_emulate_any_instruction(struct kvm_vcpu *vcpu)
case OP_RLD:
emulated = kvmppc_emulate_rld(vcpu, inst);
break;
+ case OP_RLWIMI:
+ emulated = kvmppc_emulate_rlwimi(vcpu, inst);
+ break;
case 31:
switch (get_xop(inst)) {
case OP_31_XOP_MFCR:
--
1.8.1.4
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