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KVM: x86 emulator: remove _eflags and use directly ctxt->eflags.

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Remove _eflags and use directly ctxt->eflags. Caching eflags is not needed as
it is restored to vcpu by kvm_main.c:emulate_instruction() from ctxt->eflags
only if emulation doesn't fail.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Laurent Vivier 2007-09-24 11:10:55 +02:00 committed by Avi Kivity
parent 8cdbd2c9bf
commit 05f086f87e
1 changed files with 59 additions and 62 deletions
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121
drivers/kvm/x86_emulate.c
View file

@ -941,37 +941,37 @@ static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt,
return 0;
}
static inline void emulate_grp2(struct decode_cache *c, unsigned long *_eflags)
static inline void emulate_grp2(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
switch (c->modrm_reg) {
case 0: /* rol */
emulate_2op_SrcB("rol", c->src, c->dst, *_eflags);
emulate_2op_SrcB("rol", c->src, c->dst, ctxt->eflags);
break;
case 1: /* ror */
emulate_2op_SrcB("ror", c->src, c->dst, *_eflags);
emulate_2op_SrcB("ror", c->src, c->dst, ctxt->eflags);
break;
case 2: /* rcl */
emulate_2op_SrcB("rcl", c->src, c->dst, *_eflags);
emulate_2op_SrcB("rcl", c->src, c->dst, ctxt->eflags);
break;
case 3: /* rcr */
emulate_2op_SrcB("rcr", c->src, c->dst, *_eflags);
emulate_2op_SrcB("rcr", c->src, c->dst, ctxt->eflags);
break;
case 4: /* sal/shl */
case 6: /* sal/shl */
emulate_2op_SrcB("sal", c->src, c->dst, *_eflags);
emulate_2op_SrcB("sal", c->src, c->dst, ctxt->eflags);
break;
case 5: /* shr */
emulate_2op_SrcB("shr", c->src, c->dst, *_eflags);
emulate_2op_SrcB("shr", c->src, c->dst, ctxt->eflags);
break;
case 7: /* sar */
emulate_2op_SrcB("sar", c->src, c->dst, *_eflags);
emulate_2op_SrcB("sar", c->src, c->dst, ctxt->eflags);
break;
}
}
static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
unsigned long *_eflags)
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
int rc = 0;
@ -998,13 +998,13 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
c->src.val = insn_fetch(s32, 4, c->eip);
break;
}
emulate_2op_SrcV("test", c->src, c->dst, *_eflags);
emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
break;
case 2: /* not */
c->dst.val = ~c->dst.val;
break;
case 3: /* neg */
emulate_1op("neg", c->dst, *_eflags);
emulate_1op("neg", c->dst, ctxt->eflags);
break;
default:
DPRINTF("Cannot emulate %02x\n", c->b);
@ -1017,7 +1017,6 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
unsigned long *_eflags,
int *no_wb)
{
struct decode_cache *c = &ctxt->decode;
@ -1025,10 +1024,10 @@ static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
switch (c->modrm_reg) {
case 0: /* inc */
emulate_1op("inc", c->dst, *_eflags);
emulate_1op("inc", c->dst, ctxt->eflags);
break;
case 1: /* dec */
emulate_1op("dec", c->dst, *_eflags);
emulate_1op("dec", c->dst, ctxt->eflags);
break;
case 4: /* jmp abs */
if (c->b == 0xff)
@ -1067,7 +1066,6 @@ static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
unsigned long *_eflags,
unsigned long cr2)
{
struct decode_cache *c = &ctxt->decode;
@ -1083,7 +1081,7 @@ static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt,
c->regs[VCPU_REGS_RAX] = (u32) (old >> 0);
c->regs[VCPU_REGS_RDX] = (u32) (old >> 32);
*_eflags &= ~EFLG_ZF;
ctxt->eflags &= ~EFLG_ZF;
} else {
new = ((u64)c->regs[VCPU_REGS_RCX] << 32) |
@ -1092,7 +1090,7 @@ static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt,
rc = ops->cmpxchg_emulated(cr2, &old, &new, 8, ctxt->vcpu);
if (rc != 0)
return rc;
*_eflags |= EFLG_ZF;
ctxt->eflags |= EFLG_ZF;
}
return 0;
}
@ -1152,7 +1150,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
int no_wb = 0;
u64 msr_data;
unsigned long saved_eip = 0;
unsigned long _eflags = ctxt->eflags;
struct decode_cache *c = &ctxt->decode;
int rc = 0;
@ -1207,23 +1204,23 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
switch (c->b) {
case 0x00 ... 0x05:
add: /* add */
emulate_2op_SrcV("add", c->src, c->dst, _eflags);
emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);
break;
case 0x08 ... 0x0d:
or: /* or */
emulate_2op_SrcV("or", c->src, c->dst, _eflags);
emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
break;
case 0x10 ... 0x15:
adc: /* adc */
emulate_2op_SrcV("adc", c->src, c->dst, _eflags);
emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags);
break;
case 0x18 ... 0x1d:
sbb: /* sbb */
emulate_2op_SrcV("sbb", c->src, c->dst, _eflags);
emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags);
break;
case 0x20 ... 0x23:
and: /* and */
emulate_2op_SrcV("and", c->src, c->dst, _eflags);
emulate_2op_SrcV("and", c->src, c->dst, ctxt->eflags);
break;
case 0x24: /* and al imm8 */
c->dst.type = OP_REG;
@ -1244,15 +1241,15 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
goto and;
case 0x28 ... 0x2d:
sub: /* sub */
emulate_2op_SrcV("sub", c->src, c->dst, _eflags);
emulate_2op_SrcV("sub", c->src, c->dst, ctxt->eflags);
break;
case 0x30 ... 0x35:
xor: /* xor */
emulate_2op_SrcV("xor", c->src, c->dst, _eflags);
emulate_2op_SrcV("xor", c->src, c->dst, ctxt->eflags);
break;
case 0x38 ... 0x3d:
cmp: /* cmp */
emulate_2op_SrcV("cmp", c->src, c->dst, _eflags);
emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
break;
case 0x63: /* movsxd */
if (ctxt->mode != X86EMUL_MODE_PROT64)
@ -1280,7 +1277,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
}
break;
case 0x84 ... 0x85:
emulate_2op_SrcV("test", c->src, c->dst, _eflags);
emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
break;
case 0x86 ... 0x87: /* xchg */
/* Write back the register source. */
@ -1327,7 +1324,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
c->eip += c->ad_bytes;
break;
case 0xc0 ... 0xc1:
emulate_grp2(c, &_eflags);
emulate_grp2(ctxt);
break;
case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */
mov:
@ -1335,19 +1332,19 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
break;
case 0xd0 ... 0xd1: /* Grp2 */
c->src.val = 1;
emulate_grp2(c, &_eflags);
emulate_grp2(ctxt);
break;
case 0xd2 ... 0xd3: /* Grp2 */
c->src.val = c->regs[VCPU_REGS_RCX];
emulate_grp2(c, &_eflags);
emulate_grp2(ctxt);
break;
case 0xf6 ... 0xf7: /* Grp3 */
rc = emulate_grp3(ctxt, ops, &_eflags);
rc = emulate_grp3(ctxt, ops);
if (rc != 0)
goto done;
break;
case 0xfe ... 0xff: /* Grp4/Grp5 */
rc = emulate_grp45(ctxt, ops, &_eflags, &no_wb);
rc = emulate_grp45(ctxt, ops, &no_wb);
if (rc != 0)
goto done;
break;
@ -1362,7 +1359,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
/* Commit shadow register state. */
memcpy(ctxt->vcpu->regs, c->regs, sizeof c->regs);
ctxt->eflags = _eflags;
ctxt->vcpu->rip = c->eip;
done:
@ -1413,7 +1409,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
(c->d & ByteOp) ? 1 : c->op_bytes,
c->rep_prefix ?
address_mask(c->regs[VCPU_REGS_RCX]) : 1,
(_eflags & EFLG_DF),
(ctxt->eflags & EFLG_DF),
register_address(ctxt->es_base,
c->regs[VCPU_REGS_RDI]),
c->rep_prefix,
@ -1429,7 +1425,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
(c->d & ByteOp) ? 1 : c->op_bytes,
c->rep_prefix ?
address_mask(c->regs[VCPU_REGS_RCX]) : 1,
(_eflags & EFLG_DF),
(ctxt->eflags & EFLG_DF),
register_address(c->override_base ?
*c->override_base :
ctxt->ds_base,
@ -1443,16 +1439,16 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
case 0x70 ... 0x7f: /* jcc (short) */ {
int rel = insn_fetch(s8, 1, c->eip);
if (test_cc(c->b, _eflags))
if (test_cc(c->b, ctxt->eflags))
JMP_REL(rel);
break;
}
case 0x9c: /* pushf */
c->src.val = (unsigned long) _eflags;
c->src.val = (unsigned long) ctxt->eflags;
emulate_push(ctxt);
break;
case 0x9d: /* popf */
c->dst.ptr = (unsigned long *) &_eflags;
c->dst.ptr = (unsigned long *) &ctxt->eflags;
goto pop_instruction;
case 0xc3: /* ret */
c->dst.ptr = &c->eip;
@ -1484,10 +1480,10 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
c->dst.bytes, ctxt->vcpu)) != 0)
goto done;
register_address_increment(c->regs[VCPU_REGS_RSI],
(_eflags & EFLG_DF) ? -c->dst.bytes
(ctxt->eflags & EFLG_DF) ? -c->dst.bytes
: c->dst.bytes);
register_address_increment(c->regs[VCPU_REGS_RDI],
(_eflags & EFLG_DF) ? -c->dst.bytes
(ctxt->eflags & EFLG_DF) ? -c->dst.bytes
: c->dst.bytes);
break;
case 0xa6 ... 0xa7: /* cmps */
@ -1499,7 +1495,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
c->dst.ptr = (unsigned long *)cr2;
c->dst.val = c->regs[VCPU_REGS_RAX];
register_address_increment(c->regs[VCPU_REGS_RDI],
(_eflags & EFLG_DF) ? -c->dst.bytes
(ctxt->eflags & EFLG_DF) ? -c->dst.bytes
: c->dst.bytes);
break;
case 0xac ... 0xad: /* lods */
@ -1511,7 +1507,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
ctxt->vcpu)) != 0)
goto done;
register_address_increment(c->regs[VCPU_REGS_RSI],
(_eflags & EFLG_DF) ? -c->dst.bytes
(ctxt->eflags & EFLG_DF) ? -c->dst.bytes
: c->dst.bytes);
break;
case 0xae ... 0xaf: /* scas */
@ -1599,7 +1595,8 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
case 6: /* lmsw */
if (c->modrm_mod != 3)
goto cannot_emulate;
realmode_lmsw(ctxt->vcpu, (u16)c->modrm_val, &_eflags);
realmode_lmsw(ctxt->vcpu, (u16)c->modrm_val,
&ctxt->eflags);
break;
case 7: /* invlpg*/
emulate_invlpg(ctxt->vcpu, cr2);
@ -1630,29 +1627,29 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
*/
switch ((c->b & 15) >> 1) {
case 0: /* cmovo */
no_wb = (_eflags & EFLG_OF) ? 0 : 1;
no_wb = (ctxt->eflags & EFLG_OF) ? 0 : 1;
break;
case 1: /* cmovb/cmovc/cmovnae */
no_wb = (_eflags & EFLG_CF) ? 0 : 1;
no_wb = (ctxt->eflags & EFLG_CF) ? 0 : 1;
break;
case 2: /* cmovz/cmove */
no_wb = (_eflags & EFLG_ZF) ? 0 : 1;
no_wb = (ctxt->eflags & EFLG_ZF) ? 0 : 1;
break;
case 3: /* cmovbe/cmovna */
no_wb = (_eflags & (EFLG_CF | EFLG_ZF)) ? 0 : 1;
no_wb = (ctxt->eflags & (EFLG_CF | EFLG_ZF)) ? 0 : 1;
break;
case 4: /* cmovs */
no_wb = (_eflags & EFLG_SF) ? 0 : 1;
no_wb = (ctxt->eflags & EFLG_SF) ? 0 : 1;
break;
case 5: /* cmovp/cmovpe */
no_wb = (_eflags & EFLG_PF) ? 0 : 1;
no_wb = (ctxt->eflags & EFLG_PF) ? 0 : 1;
break;
case 7: /* cmovle/cmovng */
no_wb = (_eflags & EFLG_ZF) ? 0 : 1;
no_wb = (ctxt->eflags & EFLG_ZF) ? 0 : 1;
/* fall through */
case 6: /* cmovl/cmovnge */
no_wb &= (!(_eflags & EFLG_SF) !=
!(_eflags & EFLG_OF)) ? 0 : 1;
no_wb &= (!(ctxt->eflags & EFLG_SF) !=
!(ctxt->eflags & EFLG_OF)) ? 0 : 1;
break;
}
/* Odd cmov opcodes (lsb == 1) have inverted sense. */
@ -1662,13 +1659,13 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
bt: /* bt */
/* only subword offset */
c->src.val &= (c->dst.bytes << 3) - 1;
emulate_2op_SrcV_nobyte("bt", c->src, c->dst, _eflags);
emulate_2op_SrcV_nobyte("bt", c->src, c->dst, ctxt->eflags);
break;
case 0xab:
bts: /* bts */
/* only subword offset */
c->src.val &= (c->dst.bytes << 3) - 1;
emulate_2op_SrcV_nobyte("bts", c->src, c->dst, _eflags);
emulate_2op_SrcV_nobyte("bts", c->src, c->dst, ctxt->eflags);
break;
case 0xb0 ... 0xb1: /* cmpxchg */
/*
@ -1677,8 +1674,8 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
*/
c->src.orig_val = c->src.val;
c->src.val = c->regs[VCPU_REGS_RAX];
emulate_2op_SrcV("cmp", c->src, c->dst, _eflags);
if (_eflags & EFLG_ZF) {
emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
if (ctxt->eflags & EFLG_ZF) {
/* Success: write back to memory. */
c->dst.val = c->src.orig_val;
} else {
@ -1691,7 +1688,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
btr: /* btr */
/* only subword offset */
c->src.val &= (c->dst.bytes << 3) - 1;
emulate_2op_SrcV_nobyte("btr", c->src, c->dst, _eflags);
emulate_2op_SrcV_nobyte("btr", c->src, c->dst, ctxt->eflags);
break;
case 0xb6 ... 0xb7: /* movzx */
c->dst.bytes = c->op_bytes;
@ -1714,7 +1711,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
btc: /* btc */
/* only subword offset */
c->src.val &= (c->dst.bytes << 3) - 1;
emulate_2op_SrcV_nobyte("btc", c->src, c->dst, _eflags);
emulate_2op_SrcV_nobyte("btc", c->src, c->dst, ctxt->eflags);
break;
case 0xbe ... 0xbf: /* movsx */
c->dst.bytes = c->op_bytes;
@ -1753,7 +1750,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
if (c->modrm_mod != 3)
goto cannot_emulate;
realmode_set_cr(ctxt->vcpu,
c->modrm_reg, c->modrm_val, &_eflags);
c->modrm_reg, c->modrm_val, &ctxt->eflags);
break;
case 0x30:
/* wrmsr */
@ -1795,12 +1792,12 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
DPRINTF("jnz: Invalid op_bytes\n");
goto cannot_emulate;
}
if (test_cc(c->b, _eflags))
if (test_cc(c->b, ctxt->eflags))
JMP_REL(rel);
break;
}
case 0xc7: /* Grp9 (cmpxchg8b) */
rc = emulate_grp9(ctxt, ops, &_eflags, cr2);
rc = emulate_grp9(ctxt, ops, cr2);
if (rc != 0)
goto done;
break;