KVM: PPC: Emulator: clean up instruction parsing
Instructions on PPC are pretty similarly encoded. So instead of
every instruction emulation code decoding the instruction fields
itself, we can move that code to more generic places and rely on
the compiler to optimize the unused bits away.
This has 2 advantages. It makes the code smaller and it makes the
code less error prone, as the instruction fields are always
available, so accidental misusage is reduced.
Functionally, this patch doesn't change anything.
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/arch/powerpc/kvm/44x_emulate.c b/arch/powerpc/kvm/44x_emulate.c
index 549bb2c..da81a2d 100644
--- a/arch/powerpc/kvm/44x_emulate.c
+++ b/arch/powerpc/kvm/44x_emulate.c
@@ -37,22 +37,19 @@
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
- int dcrn;
- int ra;
- int rb;
- int rc;
- int rs;
- int rt;
- int ws;
+ int dcrn = get_dcrn(inst);
+ int ra = get_ra(inst);
+ int rb = get_rb(inst);
+ int rc = get_rc(inst);
+ int rs = get_rs(inst);
+ int rt = get_rt(inst);
+ int ws = get_ws(inst);
switch (get_op(inst)) {
case 31:
switch (get_xop(inst)) {
case XOP_MFDCR:
- dcrn = get_dcrn(inst);
- rt = get_rt(inst);
-
/* The guest may access CPR0 registers to determine the timebase
* frequency, and it must know the real host frequency because it
* can directly access the timebase registers.
@@ -88,9 +85,6 @@
break;
case XOP_MTDCR:
- dcrn = get_dcrn(inst);
- rs = get_rs(inst);
-
/* emulate some access in kernel */
switch (dcrn) {
case DCRN_CPR0_CONFIG_ADDR:
@@ -108,17 +102,10 @@
break;
case XOP_TLBWE:
- ra = get_ra(inst);
- rs = get_rs(inst);
- ws = get_ws(inst);
emulated = kvmppc_44x_emul_tlbwe(vcpu, ra, rs, ws);
break;
case XOP_TLBSX:
- rt = get_rt(inst);
- ra = get_ra(inst);
- rb = get_rb(inst);
- rc = get_rc(inst);
emulated = kvmppc_44x_emul_tlbsx(vcpu, rt, ra, rb, rc);
break;
diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c
index 135663a..c023bcd 100644
--- a/arch/powerpc/kvm/book3s_emulate.c
+++ b/arch/powerpc/kvm/book3s_emulate.c
@@ -87,6 +87,10 @@
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
+ int rt = get_rt(inst);
+ int rs = get_rs(inst);
+ int ra = get_ra(inst);
+ int rb = get_rb(inst);
switch (get_op(inst)) {
case 19:
@@ -106,21 +110,22 @@
case 31:
switch (get_xop(inst)) {
case OP_31_XOP_MFMSR:
- kvmppc_set_gpr(vcpu, get_rt(inst),
- vcpu->arch.shared->msr);
+ kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->msr);
break;
case OP_31_XOP_MTMSRD:
{
- ulong rs = kvmppc_get_gpr(vcpu, get_rs(inst));
+ ulong rs_val = kvmppc_get_gpr(vcpu, rs);
if (inst & 0x10000) {
- vcpu->arch.shared->msr &= ~(MSR_RI | MSR_EE);
- vcpu->arch.shared->msr |= rs & (MSR_RI | MSR_EE);
+ ulong new_msr = vcpu->arch.shared->msr;
+ new_msr &= ~(MSR_RI | MSR_EE);
+ new_msr |= rs_val & (MSR_RI | MSR_EE);
+ vcpu->arch.shared->msr = new_msr;
} else
- kvmppc_set_msr(vcpu, rs);
+ kvmppc_set_msr(vcpu, rs_val);
break;
}
case OP_31_XOP_MTMSR:
- kvmppc_set_msr(vcpu, kvmppc_get_gpr(vcpu, get_rs(inst)));
+ kvmppc_set_msr(vcpu, kvmppc_get_gpr(vcpu, rs));
break;
case OP_31_XOP_MFSR:
{
@@ -130,7 +135,7 @@
if (vcpu->arch.mmu.mfsrin) {
u32 sr;
sr = vcpu->arch.mmu.mfsrin(vcpu, srnum);
- kvmppc_set_gpr(vcpu, get_rt(inst), sr);
+ kvmppc_set_gpr(vcpu, rt, sr);
}
break;
}
@@ -138,29 +143,29 @@
{
int srnum;
- srnum = (kvmppc_get_gpr(vcpu, get_rb(inst)) >> 28) & 0xf;
+ srnum = (kvmppc_get_gpr(vcpu, rb) >> 28) & 0xf;
if (vcpu->arch.mmu.mfsrin) {
u32 sr;
sr = vcpu->arch.mmu.mfsrin(vcpu, srnum);
- kvmppc_set_gpr(vcpu, get_rt(inst), sr);
+ kvmppc_set_gpr(vcpu, rt, sr);
}
break;
}
case OP_31_XOP_MTSR:
vcpu->arch.mmu.mtsrin(vcpu,
(inst >> 16) & 0xf,
- kvmppc_get_gpr(vcpu, get_rs(inst)));
+ kvmppc_get_gpr(vcpu, rs));
break;
case OP_31_XOP_MTSRIN:
vcpu->arch.mmu.mtsrin(vcpu,
- (kvmppc_get_gpr(vcpu, get_rb(inst)) >> 28) & 0xf,
- kvmppc_get_gpr(vcpu, get_rs(inst)));
+ (kvmppc_get_gpr(vcpu, rb) >> 28) & 0xf,
+ kvmppc_get_gpr(vcpu, rs));
break;
case OP_31_XOP_TLBIE:
case OP_31_XOP_TLBIEL:
{
bool large = (inst & 0x00200000) ? true : false;
- ulong addr = kvmppc_get_gpr(vcpu, get_rb(inst));
+ ulong addr = kvmppc_get_gpr(vcpu, rb);
vcpu->arch.mmu.tlbie(vcpu, addr, large);
break;
}
@@ -171,15 +176,15 @@
return EMULATE_FAIL;
vcpu->arch.mmu.slbmte(vcpu,
- kvmppc_get_gpr(vcpu, get_rs(inst)),
- kvmppc_get_gpr(vcpu, get_rb(inst)));
+ kvmppc_get_gpr(vcpu, rs),
+ kvmppc_get_gpr(vcpu, rb));
break;
case OP_31_XOP_SLBIE:
if (!vcpu->arch.mmu.slbie)
return EMULATE_FAIL;
vcpu->arch.mmu.slbie(vcpu,
- kvmppc_get_gpr(vcpu, get_rb(inst)));
+ kvmppc_get_gpr(vcpu, rb));
break;
case OP_31_XOP_SLBIA:
if (!vcpu->arch.mmu.slbia)
@@ -191,22 +196,22 @@
if (!vcpu->arch.mmu.slbmfee) {
emulated = EMULATE_FAIL;
} else {
- ulong t, rb;
+ ulong t, rb_val;
- rb = kvmppc_get_gpr(vcpu, get_rb(inst));
- t = vcpu->arch.mmu.slbmfee(vcpu, rb);
- kvmppc_set_gpr(vcpu, get_rt(inst), t);
+ rb_val = kvmppc_get_gpr(vcpu, rb);
+ t = vcpu->arch.mmu.slbmfee(vcpu, rb_val);
+ kvmppc_set_gpr(vcpu, rt, t);
}
break;
case OP_31_XOP_SLBMFEV:
if (!vcpu->arch.mmu.slbmfev) {
emulated = EMULATE_FAIL;
} else {
- ulong t, rb;
+ ulong t, rb_val;
- rb = kvmppc_get_gpr(vcpu, get_rb(inst));
- t = vcpu->arch.mmu.slbmfev(vcpu, rb);
- kvmppc_set_gpr(vcpu, get_rt(inst), t);
+ rb_val = kvmppc_get_gpr(vcpu, rb);
+ t = vcpu->arch.mmu.slbmfev(vcpu, rb_val);
+ kvmppc_set_gpr(vcpu, rt, t);
}
break;
case OP_31_XOP_DCBA:
@@ -214,17 +219,17 @@
break;
case OP_31_XOP_DCBZ:
{
- ulong rb = kvmppc_get_gpr(vcpu, get_rb(inst));
- ulong ra = 0;
+ ulong rb_val = kvmppc_get_gpr(vcpu, rb);
+ ulong ra_val = 0;
ulong addr, vaddr;
u32 zeros[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
u32 dsisr;
int r;
- if (get_ra(inst))
- ra = kvmppc_get_gpr(vcpu, get_ra(inst));
+ if (ra)
+ ra_val = kvmppc_get_gpr(vcpu, ra);
- addr = (ra + rb) & ~31ULL;
+ addr = (ra_val + rb_val) & ~31ULL;
if (!(vcpu->arch.shared->msr & MSR_SF))
addr &= 0xffffffff;
vaddr = addr;
@@ -565,23 +570,22 @@
ulong kvmppc_alignment_dar(struct kvm_vcpu *vcpu, unsigned int inst)
{
ulong dar = 0;
- ulong ra;
+ ulong ra = get_ra(inst);
+ ulong rb = get_rb(inst);
switch (get_op(inst)) {
case OP_LFS:
case OP_LFD:
case OP_STFD:
case OP_STFS:
- ra = get_ra(inst);
if (ra)
dar = kvmppc_get_gpr(vcpu, ra);
dar += (s32)((s16)inst);
break;
case 31:
- ra = get_ra(inst);
if (ra)
dar = kvmppc_get_gpr(vcpu, ra);
- dar += kvmppc_get_gpr(vcpu, get_rb(inst));
+ dar += kvmppc_get_gpr(vcpu, rb);
break;
default:
printk(KERN_INFO "KVM: Unaligned instruction 0x%x\n", inst);
diff --git a/arch/powerpc/kvm/booke_emulate.c b/arch/powerpc/kvm/booke_emulate.c
index 904412b..e14f7b2 100644
--- a/arch/powerpc/kvm/booke_emulate.c
+++ b/arch/powerpc/kvm/booke_emulate.c
@@ -40,8 +40,8 @@
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
- int rs;
- int rt;
+ int rs = get_rs(inst);
+ int rt = get_rt(inst);
switch (get_op(inst)) {
case 19:
@@ -62,19 +62,16 @@
switch (get_xop(inst)) {
case OP_31_XOP_MFMSR:
- rt = get_rt(inst);
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->msr);
kvmppc_set_exit_type(vcpu, EMULATED_MFMSR_EXITS);
break;
case OP_31_XOP_MTMSR:
- rs = get_rs(inst);
kvmppc_set_exit_type(vcpu, EMULATED_MTMSR_EXITS);
kvmppc_set_msr(vcpu, kvmppc_get_gpr(vcpu, rs));
break;
case OP_31_XOP_WRTEE:
- rs = get_rs(inst);
vcpu->arch.shared->msr = (vcpu->arch.shared->msr & ~MSR_EE)
| (kvmppc_get_gpr(vcpu, rs) & MSR_EE);
kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c
index 99155f8..9b2dcda 100644
--- a/arch/powerpc/kvm/e500_emulate.c
+++ b/arch/powerpc/kvm/e500_emulate.c
@@ -86,9 +86,9 @@
unsigned int inst, int *advance)
{
int emulated = EMULATE_DONE;
- int ra;
- int rb;
- int rt;
+ int ra = get_ra(inst);
+ int rb = get_rb(inst);
+ int rt = get_rt(inst);
switch (get_op(inst)) {
case 31:
@@ -96,11 +96,11 @@
#ifdef CONFIG_KVM_E500MC
case XOP_MSGSND:
- emulated = kvmppc_e500_emul_msgsnd(vcpu, get_rb(inst));
+ emulated = kvmppc_e500_emul_msgsnd(vcpu, rb);
break;
case XOP_MSGCLR:
- emulated = kvmppc_e500_emul_msgclr(vcpu, get_rb(inst));
+ emulated = kvmppc_e500_emul_msgclr(vcpu, rb);
break;
#endif
@@ -113,20 +113,14 @@
break;
case XOP_TLBSX:
- rb = get_rb(inst);
emulated = kvmppc_e500_emul_tlbsx(vcpu,rb);
break;
case XOP_TLBILX:
- ra = get_ra(inst);
- rb = get_rb(inst);
- rt = get_rt(inst);
emulated = kvmppc_e500_emul_tlbilx(vcpu, rt, ra, rb);
break;
case XOP_TLBIVAX:
- ra = get_ra(inst);
- rb = get_rb(inst);
emulated = kvmppc_e500_emul_tlbivax(vcpu, ra, rb);
break;
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index a27d4dc..f63b5cb 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -148,11 +148,10 @@
int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
u32 inst = kvmppc_get_last_inst(vcpu);
- int ra;
- int rb;
- int rs;
- int rt;
- int sprn;
+ int ra = get_ra(inst);
+ int rs = get_rs(inst);
+ int rt = get_rt(inst);
+ int sprn = get_sprn(inst);
enum emulation_result emulated = EMULATE_DONE;
int advance = 1;
@@ -189,43 +188,31 @@
advance = 0;
break;
case OP_31_XOP_LWZX:
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
break;
case OP_31_XOP_LBZX:
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
break;
case OP_31_XOP_LBZUX:
- rt = get_rt(inst);
- ra = get_ra(inst);
- rb = get_rb(inst);
-
emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
case OP_31_XOP_STWX:
- rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
4, 1);
break;
case OP_31_XOP_STBX:
- rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
1, 1);
break;
case OP_31_XOP_STBUX:
- rs = get_rs(inst);
- ra = get_ra(inst);
- rb = get_rb(inst);
-
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
1, 1);
@@ -233,28 +220,19 @@
break;
case OP_31_XOP_LHAX:
- rt = get_rt(inst);
emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
break;
case OP_31_XOP_LHZX:
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
break;
case OP_31_XOP_LHZUX:
- rt = get_rt(inst);
- ra = get_ra(inst);
- rb = get_rb(inst);
-
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
case OP_31_XOP_MFSPR:
- sprn = get_sprn(inst);
- rt = get_rt(inst);
-
switch (sprn) {
case SPRN_SRR0:
kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->srr0);
@@ -310,20 +288,12 @@
break;
case OP_31_XOP_STHX:
- rs = get_rs(inst);
- ra = get_ra(inst);
- rb = get_rb(inst);
-
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
2, 1);
break;
case OP_31_XOP_STHUX:
- rs = get_rs(inst);
- ra = get_ra(inst);
- rb = get_rb(inst);
-
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
2, 1);
@@ -331,8 +301,6 @@
break;
case OP_31_XOP_MTSPR:
- sprn = get_sprn(inst);
- rs = get_rs(inst);
switch (sprn) {
case SPRN_SRR0:
vcpu->arch.shared->srr0 = kvmppc_get_gpr(vcpu, rs);
@@ -384,7 +352,6 @@
break;
case OP_31_XOP_LWBRX:
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0);
break;
@@ -392,25 +359,16 @@
break;
case OP_31_XOP_STWBRX:
- rs = get_rs(inst);
- ra = get_ra(inst);
- rb = get_rb(inst);
-
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
4, 0);
break;
case OP_31_XOP_LHBRX:
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
break;
case OP_31_XOP_STHBRX:
- rs = get_rs(inst);
- ra = get_ra(inst);
- rb = get_rb(inst);
-
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
2, 0);
@@ -423,39 +381,30 @@
break;
case OP_LWZ:
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
break;
case OP_LWZU:
- ra = get_ra(inst);
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
case OP_LBZ:
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
break;
case OP_LBZU:
- ra = get_ra(inst);
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
case OP_STW:
- rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
4, 1);
break;
case OP_STWU:
- ra = get_ra(inst);
- rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
4, 1);
@@ -463,15 +412,12 @@
break;
case OP_STB:
- rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
1, 1);
break;
case OP_STBU:
- ra = get_ra(inst);
- rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
1, 1);
@@ -479,39 +425,30 @@
break;
case OP_LHZ:
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
break;
case OP_LHZU:
- ra = get_ra(inst);
- rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
case OP_LHA:
- rt = get_rt(inst);
emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
break;
case OP_LHAU:
- ra = get_ra(inst);
- rt = get_rt(inst);
emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
case OP_STH:
- rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
2, 1);
break;
case OP_STHU:
- ra = get_ra(inst);
- rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu,
kvmppc_get_gpr(vcpu, rs),
2, 1);