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-rw-r--r--drivers/kvm/x86_emulate.c919
-rw-r--r--drivers/kvm/x86_emulate.h34
2 files changed, 518 insertions, 435 deletions
diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 9ea82f84743..d7026cb8fc7 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -222,13 +222,6 @@ static u16 twobyte_table[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
-/* Type, address-of, and value of an instruction's operand. */
-struct operand {
- enum { OP_REG, OP_MEM, OP_IMM } type;
- unsigned int bytes;
- unsigned long val, orig_val, *ptr;
-};
-
/* EFLAGS bit definitions. */
#define EFLG_OF (1<<11)
#define EFLG_DF (1<<10)
@@ -431,24 +424,26 @@ struct operand {
/* Access/update address held in a register, based on addressing mode. */
#define address_mask(reg) \
- ((ad_bytes == sizeof(unsigned long)) ? \
- (reg) : ((reg) & ((1UL << (ad_bytes << 3)) - 1)))
+ ((c->ad_bytes == sizeof(unsigned long)) ? \
+ (reg) : ((reg) & ((1UL << (c->ad_bytes << 3)) - 1)))
#define register_address(base, reg) \
((base) + address_mask(reg))
#define register_address_increment(reg, inc) \
do { \
/* signed type ensures sign extension to long */ \
int _inc = (inc); \
- if ( ad_bytes == sizeof(unsigned long) ) \
+ if (c->ad_bytes == sizeof(unsigned long)) \
(reg) += _inc; \
else \
- (reg) = ((reg) & ~((1UL << (ad_bytes << 3)) - 1)) | \
- (((reg) + _inc) & ((1UL << (ad_bytes << 3)) - 1)); \
+ (reg) = ((reg) & \
+ ~((1UL << (c->ad_bytes << 3)) - 1)) | \
+ (((reg) + _inc) & \
+ ((1UL << (c->ad_bytes << 3)) - 1)); \
} while (0)
#define JMP_REL(rel) \
do { \
- register_address_increment(_eip, rel); \
+ register_address_increment(c->eip, rel); \
} while (0)
/*
@@ -524,39 +519,35 @@ static int test_cc(unsigned int condition, unsigned int flags)
int
x86_emulate_memop(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
{
- unsigned d;
- u8 b, sib, twobyte = 0, rex_prefix = 0;
- u8 modrm, modrm_mod = 0, modrm_reg = 0, modrm_rm = 0;
- unsigned long *override_base = NULL;
- unsigned int op_bytes, ad_bytes, lock_prefix = 0, rep_prefix = 0, i;
+ struct decode_cache *c = &ctxt->decode;
+ u8 sib, rex_prefix = 0;
+ unsigned int i;
int rc = 0;
- struct operand src, dst;
unsigned long cr2 = ctxt->cr2;
int mode = ctxt->mode;
- unsigned long modrm_ea;
- int use_modrm_ea, index_reg = 0, base_reg = 0, scale, rip_relative = 0;
+ int index_reg = 0, base_reg = 0, scale, rip_relative = 0;
int no_wb = 0;
u64 msr_data;
/* Shadow copy of register state. Committed on successful emulation. */
- unsigned long _regs[NR_VCPU_REGS];
- unsigned long _eip = ctxt->vcpu->rip, _eflags = ctxt->eflags;
- unsigned long modrm_val = 0;
+ unsigned long _eflags = ctxt->eflags;
- memcpy(_regs, ctxt->vcpu->regs, sizeof _regs);
+ memset(c, 0, sizeof(struct decode_cache));
+ c->eip = ctxt->vcpu->rip;
+ memcpy(c->regs, ctxt->vcpu->regs, sizeof c->regs);
switch (mode) {
case X86EMUL_MODE_REAL:
case X86EMUL_MODE_PROT16:
- op_bytes = ad_bytes = 2;
+ c->op_bytes = c->ad_bytes = 2;
break;
case X86EMUL_MODE_PROT32:
- op_bytes = ad_bytes = 4;
+ c->op_bytes = c->ad_bytes = 4;
break;
#ifdef CONFIG_X86_64
case X86EMUL_MODE_PROT64:
- op_bytes = 4;
- ad_bytes = 8;
+ c->op_bytes = 4;
+ c->ad_bytes = 8;
break;
#endif
default:
@@ -565,40 +556,42 @@ x86_emulate_memop(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
/* Legacy prefixes. */
for (i = 0; i < 8; i++) {
- switch (b = insn_fetch(u8, 1, _eip)) {
+ switch (c->b = insn_fetch(u8, 1, c->eip)) {
case 0x66: /* operand-size override */
- op_bytes ^= 6; /* switch between 2/4 bytes */
+ c->op_bytes ^= 6; /* switch between 2/4 bytes */
break;
case 0x67: /* address-size override */
if (mode == X86EMUL_MODE_PROT64)
- ad_bytes ^= 12; /* switch between 4/8 bytes */
+ /* switch between 4/8 bytes */
+ c->ad_bytes ^= 12;
else
- ad_bytes ^= 6; /* switch between 2/4 bytes */
+ /* switch between 2/4 bytes */
+ c->ad_bytes ^= 6;
break;
case 0x2e: /* CS override */
- override_base = &ctxt->cs_base;
+ c->override_base = &ctxt->cs_base;
break;
case 0x3e: /* DS override */
- override_base = &ctxt->ds_base;
+ c->override_base = &ctxt->ds_base;
break;
case 0x26: /* ES override */
- override_base = &ctxt->es_base;
+ c->override_base = &ctxt->es_base;
break;
case 0x64: /* FS override */
- override_base = &ctxt->fs_base;
+ c->override_base = &ctxt->fs_base;
break;
case 0x65: /* GS override */
- override_base = &ctxt->gs_base;
+ c->override_base = &ctxt->gs_base;
break;
case 0x36: /* SS override */
- override_base = &ctxt->ss_base;
+ c->override_base = &ctxt->ss_base;
break;
case 0xf0: /* LOCK */
- lock_prefix = 1;
+ c->lock_prefix = 1;
break;
case 0xf2: /* REPNE/REPNZ */
case 0xf3: /* REP/REPE/REPZ */
- rep_prefix = 1;
+ c->rep_prefix = 1;
break;
default:
goto done_prefixes;
@@ -608,177 +601,182 @@ x86_emulate_memop(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
done_prefixes:
/* REX prefix. */
- if ((mode == X86EMUL_MODE_PROT64) && ((b & 0xf0) == 0x40)) {
- rex_prefix = b;
- if (b & 8)
- op_bytes = 8; /* REX.W */
- modrm_reg = (b & 4) << 1; /* REX.R */
- index_reg = (b & 2) << 2; /* REX.X */
- modrm_rm = base_reg = (b & 1) << 3; /* REG.B */
- b = insn_fetch(u8, 1, _eip);
+ if ((mode == X86EMUL_MODE_PROT64) && ((c->b & 0xf0) == 0x40)) {
+ rex_prefix = c->b;
+ if (c->b & 8)
+ c->op_bytes = 8; /* REX.W */
+ c->modrm_reg = (c->b & 4) << 1; /* REX.R */
+ index_reg = (c->b & 2) << 2; /* REX.X */
+ c->modrm_rm = base_reg = (c->b & 1) << 3; /* REG.B */
+ c->b = insn_fetch(u8, 1, c->eip);
}
/* Opcode byte(s). */
- d = opcode_table[b];
- if (d == 0) {
+ c->d = opcode_table[c->b];
+ if (c->d == 0) {
/* Two-byte opcode? */
- if (b == 0x0f) {
- twobyte = 1;
- b = insn_fetch(u8, 1, _eip);
- d = twobyte_table[b];
+ if (c->b == 0x0f) {
+ c->twobyte = 1;
+ c->b = insn_fetch(u8, 1, c->eip);
+ c->d = twobyte_table[c->b];
}
/* Unrecognised? */
- if (d == 0)
+ if (c->d == 0)
goto cannot_emulate;
}
/* ModRM and SIB bytes. */
- if (d & ModRM) {
- modrm = insn_fetch(u8, 1, _eip);
- modrm_mod |= (modrm & 0xc0) >> 6;
- modrm_reg |= (modrm & 0x38) >> 3;
- modrm_rm |= (modrm & 0x07);
- modrm_ea = 0;
- use_modrm_ea = 1;
-
- if (modrm_mod == 3) {
- modrm_val = *(unsigned long *)
- decode_register(modrm_rm, _regs, d & ByteOp);
+ if (c->d & ModRM) {
+ c->modrm = insn_fetch(u8, 1, c->eip);
+ c->modrm_mod |= (c->modrm & 0xc0) >> 6;
+ c->modrm_reg |= (c->modrm & 0x38) >> 3;
+ c->modrm_rm |= (c->modrm & 0x07);
+ c->modrm_ea = 0;
+ c->use_modrm_ea = 1;
+
+ if (c->modrm_mod == 3) {
+ c->modrm_val = *(unsigned long *)
+ decode_register(c->modrm_rm, c->regs, c->d & ByteOp);
goto modrm_done;
}
- if (ad_bytes == 2) {
- unsigned bx = _regs[VCPU_REGS_RBX];
- unsigned bp = _regs[VCPU_REGS_RBP];
- unsigned si = _regs[VCPU_REGS_RSI];
- unsigned di = _regs[VCPU_REGS_RDI];
+ if (c->ad_bytes == 2) {
+ unsigned bx = c->regs[VCPU_REGS_RBX];
+ unsigned bp = c->regs[VCPU_REGS_RBP];
+ unsigned si = c->regs[VCPU_REGS_RSI];
+ unsigned di = c->regs[VCPU_REGS_RDI];
/* 16-bit ModR/M decode. */
- switch (modrm_mod) {
+ switch (c->modrm_mod) {
case 0:
- if (modrm_rm == 6)
- modrm_ea += insn_fetch(u16, 2, _eip);
+ if (c->modrm_rm == 6)
+ c->modrm_ea +=
+ insn_fetch(u16, 2, c->eip);
break;
case 1:
- modrm_ea += insn_fetch(s8, 1, _eip);
+ c->modrm_ea += insn_fetch(s8, 1, c->eip);
break;
case 2:
- modrm_ea += insn_fetch(u16, 2, _eip);
+ c->modrm_ea += insn_fetch(u16, 2, c->eip);
break;
}
- switch (modrm_rm) {
+ switch (c->modrm_rm) {
case 0:
- modrm_ea += bx + si;
+ c->modrm_ea += bx + si;
break;
case 1:
- modrm_ea += bx + di;
+ c->modrm_ea += bx + di;
break;
case 2:
- modrm_ea += bp + si;
+ c->modrm_ea += bp + si;
break;
case 3:
- modrm_ea += bp + di;
+ c->modrm_ea += bp + di;
break;
case 4:
- modrm_ea += si;
+ c->modrm_ea += si;
break;
case 5:
- modrm_ea += di;
+ c->modrm_ea += di;
break;
case 6:
- if (modrm_mod != 0)
- modrm_ea += bp;
+ if (c->modrm_mod != 0)
+ c->modrm_ea += bp;
break;
case 7:
- modrm_ea += bx;
+ c->modrm_ea += bx;
break;
}
- if (modrm_rm == 2 || modrm_rm == 3 ||
- (modrm_rm == 6 && modrm_mod != 0))
- if (!override_base)
- override_base = &ctxt->ss_base;
- modrm_ea = (u16)modrm_ea;
+ if (c->modrm_rm == 2 || c->modrm_rm == 3 ||
+ (c->modrm_rm == 6 && c->modrm_mod != 0))
+ if (!c->override_base)
+ c->override_base = &ctxt->ss_base;
+ c->modrm_ea = (u16)c->modrm_ea;
} else {
/* 32/64-bit ModR/M decode. */
- switch (modrm_rm) {
+ switch (c->modrm_rm) {
case 4:
case 12:
- sib = insn_fetch(u8, 1, _eip);
+ sib = insn_fetch(u8, 1, c->eip);
index_reg |= (sib >> 3) & 7;
base_reg |= sib & 7;
scale = sib >> 6;
switch (base_reg) {
case 5:
- if (modrm_mod != 0)
- modrm_ea += _regs[base_reg];
+ if (c->modrm_mod != 0)
+ c->modrm_ea +=
+ c->regs[base_reg];
else
- modrm_ea += insn_fetch(s32, 4, _eip);
+ c->modrm_ea +=
+ insn_fetch(s32, 4, c->eip);
break;
default:
- modrm_ea += _regs[base_reg];
+ c->modrm_ea += c->regs[base_reg];
}
switch (index_reg) {
case 4:
break;
default:
- modrm_ea += _regs[index_reg] << scale;
+ c->modrm_ea +=
+ c->regs[index_reg] << scale;
}
break;
case 5:
- if (modrm_mod != 0)
- modrm_ea += _regs[modrm_rm];
+ if (c->modrm_mod != 0)
+ c->modrm_ea += c->regs[c->modrm_rm];
else if (mode == X86EMUL_MODE_PROT64)
rip_relative = 1;
break;
default:
- modrm_ea += _regs[modrm_rm];
+ c->modrm_ea += c->regs[c->modrm_rm];
break;
}
- switch (modrm_mod) {
+ switch (c->modrm_mod) {
case 0:
- if (modrm_rm == 5)
- modrm_ea += insn_fetch(s32, 4, _eip);
+ if (c->modrm_rm == 5)
+ c->modrm_ea +=
+ insn_fetch(s32, 4, c->eip);
break;
case 1:
- modrm_ea += insn_fetch(s8, 1, _eip);
+ c->modrm_ea += insn_fetch(s8, 1, c->eip);
break;
case 2:
- modrm_ea += insn_fetch(s32, 4, _eip);
+ c->modrm_ea += insn_fetch(s32, 4, c->eip);
break;
}
}
- if (!override_base)
- override_base = &ctxt->ds_base;
+ if (!c->override_base)
+ c->override_base = &ctxt->ds_base;
if (mode == X86EMUL_MODE_PROT64 &&
- override_base != &ctxt->fs_base &&
- override_base != &ctxt->gs_base)
- override_base = NULL;
+ c->override_base != &ctxt->fs_base &&
+ c->override_base != &ctxt->gs_base)
+ c->override_base = NULL;
- if (override_base)
- modrm_ea += *override_base;
+ if (c->override_base)
+ c->modrm_ea += *c->override_base;
if (rip_relative) {
- modrm_ea += _eip;
- switch (d & SrcMask) {
+ c->modrm_ea += c->eip;
+ switch (c->d & SrcMask) {
case SrcImmByte:
- modrm_ea += 1;
+ c->modrm_ea += 1;
break;
case SrcImm:
- if (d & ByteOp)
- modrm_ea += 1;
+ if (c->d & ByteOp)
+ c->modrm_ea += 1;
else
- if (op_bytes == 8)
- modrm_ea += 4;
+ if (c->op_bytes == 8)
+ c->modrm_ea += 4;
else
- modrm_ea += op_bytes;
+ c->modrm_ea += c->op_bytes;
}
}
- if (ad_bytes != 8)
- modrm_ea = (u32)modrm_ea;
- cr2 = modrm_ea;
+ if (c->ad_bytes != 8)
+ c->modrm_ea = (u32)c->modrm_ea;
+ cr2 = c->modrm_ea;
modrm_done:
;
}
@@ -787,200 +785,210 @@ done_prefixes:
* Decode and fetch the source operand: register, memory
* or immediate.
*/
- switch (d & SrcMask) {
+ switch (c->d & SrcMask) {
case SrcNone:
break;
case SrcReg:
- src.type = OP_REG;
- if (d & ByteOp) {
- src.ptr = decode_register(modrm_reg, _regs,
+ c->src.type = OP_REG;
+ if (c->d & ByteOp) {
+ c->src.ptr =
+ decode_register(c->modrm_reg, c->regs,
(rex_prefix == 0));
- src.val = src.orig_val = *(u8 *) src.ptr;
- src.bytes = 1;
+ c->src.val = c->src.orig_val = *(u8 *)c->src.ptr;
+ c->src.bytes = 1;
} else {
- src.ptr = decode_register(modrm_reg, _regs, 0);
- switch ((src.bytes = op_bytes)) {
+ c->src.ptr =
+ decode_register(c->modrm_reg, c->regs, 0);
+ switch ((c->src.bytes = c->op_bytes)) {
case 2:
- src.val = src.orig_val = *(u16 *) src.ptr;
+ c->src.val = c->src.orig_val =
+ *(u16 *) c->src.ptr;
break;
case 4:
- src.val = src.orig_val = *(u32 *) src.ptr;
+ c->src.val = c->src.orig_val =
+ *(u32 *) c->src.ptr;
break;
case 8:
- src.val = src.orig_val = *(u64 *) src.ptr;
+ c->src.val = c->src.orig_val =
+ *(u64 *) c->src.ptr;
break;
}
}
break;
case SrcMem16:
- src.bytes = 2;
+ c->src.bytes = 2;
goto srcmem_common;
case SrcMem32:
- src.bytes = 4;
+ c->src.bytes = 4;
goto srcmem_common;
case SrcMem:
- src.bytes = (d & ByteOp) ? 1 : op_bytes;
+ c->src.bytes = (c->d & ByteOp) ? 1 :
+ c->op_bytes;
/* Don't fetch the address for invlpg: it could be unmapped. */
- if (twobyte && b == 0x01 && modrm_reg == 7)
+ if (c->twobyte && c->b == 0x01
+ && c->modrm_reg == 7)
break;
srcmem_common:
/*
* For instructions with a ModR/M byte, switch to register
* access if Mod = 3.
*/
- if ((d & ModRM) && modrm_mod == 3) {
- src.type = OP_REG;
+ if ((c->d & ModRM) && c->modrm_mod == 3) {
+ c->src.type = OP_REG;
break;
}
- src.type = OP_MEM;
- src.ptr = (unsigned long *)cr2;
- src.val = 0;
- if ((rc = ops->read_emulated((unsigned long)src.ptr,
- &src.val, src.bytes, ctxt->vcpu)) != 0)
+ c->src.type = OP_MEM;
+ c->src.ptr = (unsigned long *)cr2;
+ c->src.val = 0;
+ if ((rc = ops->read_emulated((unsigned long)c->src.ptr,
+ &c->src.val,
+ c->src.bytes, ctxt->vcpu)) != 0)
goto done;
- src.orig_val = src.val;
+ c->src.orig_val = c->src.val;
break;
case SrcImm:
- src.type = OP_IMM;
- src.ptr = (unsigned long *)_eip;
- src.bytes = (d & ByteOp) ? 1 : op_bytes;
- if (src.bytes == 8)
- src.bytes = 4;
+ c->src.type = OP_IMM;
+ c->src.ptr = (unsigned long *)c->eip;
+ c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ if (c->src.bytes == 8)
+ c->src.bytes = 4;
/* NB. Immediates are sign-extended as necessary. */
- switch (src.bytes) {
+ switch (c->src.bytes) {
case 1:
- src.val = insn_fetch(s8, 1, _eip);
+ c->src.val = insn_fetch(s8, 1, c->eip);
break;
case 2:
- src.val = insn_fetch(s16, 2, _eip);
+ c->src.val = insn_fetch(s16, 2, c->eip);
break;
case 4:
- src.val = insn_fetch(s32, 4, _eip);
+ c->src.val = insn_fetch(s32, 4, c->eip);
break;
}
break;
case SrcImmByte:
- src.type = OP_IMM;
- src.ptr = (unsigned long *)_eip;
- src.bytes = 1;
- src.val = insn_fetch(s8, 1, _eip);
+ c->src.type = OP_IMM;
+ c->src.ptr = (unsigned long *)c->eip;
+ c->src.bytes = 1;
+ c->src.val = insn_fetch(s8, 1, c->eip);
break;
}
/* Decode and fetch the destination operand: register or memory. */
- switch (d & DstMask) {
+ switch (c->d & DstMask) {
case ImplicitOps:
/* Special instructions do their own operand decoding. */
goto special_insn;
case DstReg:
- dst.type = OP_REG;
- if ((d & ByteOp)
- && !(twobyte && (b == 0xb6 || b == 0xb7))) {
- dst.ptr = decode_register(modrm_reg, _regs,
+ c->dst.type = OP_REG;
+ if ((c->d & ByteOp)
+ && !(c->twobyte &&
+ (c->b == 0xb6 || c->b == 0xb7))) {
+ c->dst.ptr =
+ decode_register(c->modrm_reg, c->regs,
(rex_prefix == 0));
- dst.val = *(u8 *) dst.ptr;
- dst.bytes = 1;
+ c->dst.val = *(u8 *) c->dst.ptr;
+ c->dst.bytes = 1;
} else {
- dst.ptr = decode_register(modrm_reg, _regs, 0);
- switch ((dst.bytes = op_bytes)) {
+ c->dst.ptr =
+ decode_register(c->modrm_reg, c->regs, 0);
+ switch ((c->dst.bytes = c->op_bytes)) {
case 2:
- dst.val = *(u16 *)dst.ptr;
+ c->dst.val = *(u16 *)c->dst.ptr;
break;
case 4:
- dst.val = *(u32 *)dst.ptr;
+ c->dst.val = *(u32 *)c->dst.ptr;
break;
case 8:
- dst.val = *(u64 *)dst.ptr;
+ c->dst.val = *(u64 *)c->dst.ptr;
break;
}
}
break;
case DstMem:
- dst.type = OP_MEM;
- dst.ptr = (unsigned long *)cr2;
- dst.bytes = (d & ByteOp) ? 1 : op_bytes;
- dst.val = 0;
- /*
- * For instructions with a ModR/M byte, switch to register
- * access if Mod = 3.
- */
- if ((d & ModRM) && modrm_mod == 3) {
- dst.type = OP_REG;
+ c->dst.type = OP_MEM;
+ c->dst.ptr = (unsigned long *)cr2;
+ c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ c->dst.val = 0;
+ if ((c->d & ModRM) && c->modrm_mod == 3) {
+ c->dst.type = OP_REG;
break;
}
- if (d & BitOp) {
- unsigned long mask = ~(dst.bytes * 8 - 1);
+ if (c->d & BitOp) {
+ unsigned long mask = ~(c->dst.bytes * 8 - 1);
- dst.ptr = (void *)dst.ptr + (src.val & mask) / 8;
+ c->dst.ptr = (void *)c->dst.ptr +
+ (c->src.val & mask) / 8;
}
- if (!(d & Mov) && /* optimisation - avoid slow emulated read */
- ((rc = ops->read_emulated((unsigned long)dst.ptr,
- &dst.val, dst.bytes, ctxt->vcpu)) != 0))
+ if (!(c->d & Mov) &&
+ /* optimisation - avoid slow emulated read */
+ ((rc = ops->read_emulated((unsigned long)c->dst.ptr,
+ &c->dst.val,
+ c->dst.bytes, ctxt->vcpu)) != 0))
goto done;
break;
}
- dst.orig_val = dst.val;
+ c->dst.orig_val = c->dst.val;
- if (twobyte)
+ if (c->twobyte)
goto twobyte_insn;
- switch (b) {
+ switch (c->b) {
case 0x00 ... 0x05:
add: /* add */
- emulate_2op_SrcV("add", src, dst, _eflags);
+ emulate_2op_SrcV("add", c->src, c->dst, _eflags);
break;
case 0x08 ... 0x0d:
or: /* or */
- emulate_2op_SrcV("or", src, dst, _eflags);
+ emulate_2op_SrcV("or", c->src, c->dst, _eflags);
break;
case 0x10 ... 0x15:
adc: /* adc */
- emulate_2op_SrcV("adc", src, dst, _eflags);
+ emulate_2op_SrcV("adc", c->src, c->dst, _eflags);
break;
case 0x18 ... 0x1d:
sbb: /* sbb */
- emulate_2op_SrcV("sbb", src, dst, _eflags);
+ emulate_2op_SrcV("sbb", c->src, c->dst, _eflags);
break;
case 0x20 ... 0x23:
and: /* and */
- emulate_2op_SrcV("and", src, dst, _eflags);
+ emulate_2op_SrcV("and", c->src, c->dst, _eflags);
break;
case 0x24: /* and al imm8 */
- dst.type = OP_REG;
- dst.ptr = &_regs[VCPU_REGS_RAX];
- dst.val = *(u8 *)dst.ptr;
- dst.bytes = 1;
- dst.orig_val = dst.val;
+ c->dst.type = OP_REG;
+ c->dst.ptr = &c->regs[VCPU_REGS_RAX];
+ c->dst.val = *(u8 *)c->dst.ptr;
+ c->dst.bytes = 1;
+ c->dst.orig_val = c->dst.val;
goto and;
case 0x25: /* and ax imm16, or eax imm32 */
- dst.type = OP_REG;
- dst.bytes = op_bytes;
- dst.ptr = &_regs[VCPU_REGS_RAX];
- if (op_bytes == 2)
- dst.val = *(u16 *)dst.ptr;
+ c->dst.type = OP_REG;
+ c->dst.bytes = c->op_bytes;
+ c->dst.ptr = &c->regs[VCPU_REGS_RAX];
+ if (c->op_bytes == 2)
+ c->dst.val = *(u16 *)c->dst.ptr;
else
- dst.val = *(u32 *)dst.ptr;
- dst.orig_val = dst.val;
+ c->dst.val = *(u32 *)c->dst.ptr;
+ c->dst.orig_val = c->dst.val;
goto and;
case 0x28 ... 0x2d:
sub: /* sub */
- emulate_2op_SrcV("sub", src, dst, _eflags);
+ emulate_2op_SrcV("sub", c->src, c->dst, _eflags);
break;
case 0x30 ... 0x35:
xor: /* xor */
- emulate_2op_SrcV("xor", src, dst, _eflags);
+ emulate_2op_SrcV("xor", c->src, c->dst, _eflags);
break;
case 0x38 ... 0x3d:
cmp: /* cmp */
- emulate_2op_SrcV("cmp", src, dst, _eflags);
+ emulate_2op_SrcV("cmp", c->src, c->dst, _eflags);
break;
case 0x63: /* movsxd */
if (mode != X86EMUL_MODE_PROT64)
goto cannot_emulate;
- dst.val = (s32) src.val;
+ c->dst.val = (s32) c->src.val;
break;
case 0x80 ... 0x83: /* Grp1 */
- switch (modrm_reg) {
+ switch (c->modrm_reg) {
case 0:
goto add;
case 1:
@@ -1001,155 +1009,164 @@ done_prefixes:
break;
case 0x84 ... 0x85:
test: /* test */
- emulate_2op_SrcV("test", src, dst, _eflags);
+ emulate_2op_SrcV("test", c->src, c->dst, _eflags);
break;
case 0x86 ... 0x87: /* xchg */
/* Write back the register source. */
- switch (dst.bytes) {
+ switch (c->dst.bytes) {
case 1:
- *(u8 *) src.ptr = (u8) dst.val;
+ *(u8 *) c->src.ptr = (u8) c->dst.val;
break;
case 2:
- *(u16 *) src.ptr = (u16) dst.val;
+ *(u16 *) c->src.ptr = (u16) c->dst.val;
break;
case 4:
- *src.ptr = (u32) dst.val;
+ *c->src.ptr = (u32) c->dst.val;
break; /* 64b reg: zero-extend */
case 8:
- *src.ptr = dst.val;
+ *c->src.ptr = c->dst.val;
break;
}
/*
* Write back the memory destination with implicit LOCK
* prefix.
*/
- dst.val = src.val;
- lock_prefix = 1;
+ c->dst.val = c->src.val;
+ c->lock_prefix = 1;
break;
case 0x88 ... 0x8b: /* mov */
goto mov;
case 0x8d: /* lea r16/r32, m */
- dst.val = modrm_val;
+ c->dst.val = c->modrm_val;
break;
case 0x8f: /* pop (sole member of Grp1a) */
/* 64-bit mode: POP always pops a 64-bit operand. */
if (mode == X86EMUL_MODE_PROT64)
- dst.bytes = 8;
- if ((rc = ops->read_std(register_address(ctxt->ss_base,
- _regs[VCPU_REGS_RSP]),
- &dst.val, dst.bytes, ctxt->vcpu)) != 0)
+ c->dst.bytes = 8;
+ if ((rc = ops->read_std(register_address(
+ ctxt->ss_base,
+ c->regs[VCPU_REGS_RSP]),
+ &c->dst.val,
+ c->dst.bytes,
+ ctxt->vcpu)) != 0)
goto done;
- register_address_increment(_regs[VCPU_REGS_RSP], dst.bytes);
+ register_address_increment(c->regs[VCPU_REGS_RSP],
+ c->dst.bytes);
break;
case 0xa0 ... 0xa1: /* mov */
- dst.ptr = (unsigned long *)&_regs[VCPU_REGS_RAX];
- dst.val = src.val;
- _eip += ad_bytes; /* skip src displacement */
+ c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
+ c->dst.val = c->src.val;
+ /* skip src displacement */
+ c->eip += c->ad_bytes;
break;
case 0xa2 ... 0xa3: /* mov */
- dst.val = (unsigned long)_regs[VCPU_REGS_RAX];
- _eip += ad_bytes; /* skip dst displacement */
+ c->dst.val = (unsigned long)c->regs[VCPU_REGS_RAX];
+ /* skip c->dst displacement */
+ c->eip += c->ad_bytes;
break;
case 0xc0 ... 0xc1:
grp2: /* Grp2 */
- switch (modrm_reg) {
+ switch (c->modrm_reg) {
case 0: /* rol */
- emulate_2op_SrcB("rol", src, dst, _eflags);
+ emulate_2op_SrcB("rol", c->src, c->dst, _eflags);
break;
case 1: /* ror */
- emulate_2op_SrcB("ror", src, dst, _eflags);
+ emulate_2op_SrcB("ror", c->src, c->dst, _eflags);
break;
case 2: /* rcl */
- emulate_2op_SrcB("rcl", src, dst, _eflags);
+ emulate_2op_SrcB("rcl", c->src, c->dst, _eflags);
break;
case 3: /* rcr */
- emulate_2op_SrcB("rcr", src, dst, _eflags);
+ emulate_2op_SrcB("rcr", c->src, c->dst, _eflags);
break;
case 4: /* sal/shl */
case 6: /* sal/shl */
- emulate_2op_SrcB("sal", src, dst, _eflags);
+ emulate_2op_SrcB("sal", c->src, c->dst, _eflags);
break;
case 5: /* shr */
- emulate_2op_SrcB("shr", src, dst, _eflags);
+ emulate_2op_SrcB("shr", c->src, c->dst, _eflags);
break;
case 7: /* sar */
- emulate_2op_SrcB("sar", src, dst, _eflags);
+ emulate_2op_SrcB("sar", c->src, c->dst, _eflags);
break;
}
break;
case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */
mov:
- dst.val = src.val;
+ c->dst.val = c->src.val;
break;
case 0xd0 ... 0xd1: /* Grp2 */
- src.val = 1;
+ c->src.val = 1;
goto grp2;
case 0xd2 ... 0xd3: /* Grp2 */
- src.val = _regs[VCPU_REGS_RCX];
+ c->src.val = c->regs[VCPU_REGS_RCX];
goto grp2;
case 0xf6 ... 0xf7: /* Grp3 */
- switch (modrm_reg) {
+ switch (c->modrm_reg) {
case 0 ... 1: /* test */
/*
* Special case in Grp3: test has an immediate
* source operand.
*/
- src.type = OP_IMM;
- src.ptr = (unsigned long *)_eip;
- src.bytes = (d & ByteOp) ? 1 : op_bytes;
- if (src.bytes == 8)
- src.bytes = 4;
- switch (src.bytes) {
+ c->src.type = OP_IMM;
+ c->src.ptr = (unsigned long *)c->eip;
+ c->src.bytes = (c->d & ByteOp) ? 1 :
+ c->op_bytes;
+ if (c->src.bytes == 8)
+ c->src.bytes = 4;
+ switch (c->src.bytes) {
case 1:
- src.val = insn_fetch(s8, 1, _eip);
+ c->src.val = insn_fetch(s8, 1, c->eip);
break;
case 2:
- src.val = insn_fetch(s16, 2, _eip);
+ c->src.val = insn_fetch(s16, 2, c->eip);
break;
case 4:
- src.val = insn_fetch(s32, 4, _eip);
+ c->src.val = insn_fetch(s32, 4, c->eip);
break;
}
goto test;
case 2: /* not */
- dst.val = ~dst.val;
+ c->dst.val = ~c->dst.val;
break;
case 3: /* neg */
- emulate_1op("neg", dst, _eflags);
+ emulate_1op("neg", c->dst, _eflags);
break;
default:
goto cannot_emulate;
}
break;
case 0xfe ... 0xff: /* Grp4/Grp5 */
- switch (modrm_reg) {
+ switch (c->modrm_reg) {
case 0: /* inc */
- emulate_1op("inc", dst, _eflags);
+ emulate_1op("inc", c->dst, _eflags);
break;
case 1: /* dec */
- emulate_1op("dec", dst, _eflags);
+ emulate_1op("dec", c->dst, _eflags);
break;
case 4: /* jmp abs */
- if (b == 0xff)
- _eip = dst.val;
+ if (c->b == 0xff)
+ c->eip = c->dst.val;
else
goto cannot_emulate;
break;
case 6: /* push */
/* 64-bit mode: PUSH always pushes a 64-bit operand. */
if (mode == X86EMUL_MODE_PROT64) {
- dst.bytes = 8;
- if ((rc = ops->read_std((unsigned long)dst.ptr,
- &dst.val, 8,
- ctxt->vcpu)) != 0)
+ c->dst.bytes = 8;
+ if ((rc = ops->read_std(
+ (unsigned long)c->dst.ptr,
+ &c->dst.val, 8,
+ ctxt->vcpu)) != 0)
goto done;
}
- register_address_increment(_regs[VCPU_REGS_RSP],
- -dst.bytes);
+ register_address_increment(c->regs[VCPU_REGS_RSP],
+ -c->dst.bytes);
if ((rc = ops->write_emulated(
register_address(ctxt->ss_base,
- _regs[VCPU_REGS_RSP]),
- &dst.val, dst.bytes, ctxt->vcpu)) != 0)
+ c->regs[VCPU_REGS_RSP]),
+ &c->dst.val,
+ c->dst.bytes, ctxt->vcpu)) != 0)
goto done;
no_wb = 1;
break;
@@ -1161,34 +1178,40 @@ done_prefixes:
writeback:
if (!no_wb) {
- switch (dst.type) {
+ switch (c->dst.type) {
case OP_REG:
- /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */
- switch (dst.bytes) {
+ /* The 4-byte case *is* correct:
+ * in 64-bit mode we zero-extend.
+ */
+ switch (c->dst.bytes) {
case 1:
- *(u8 *)dst.ptr = (u8)dst.val;
+ *(u8 *)c->dst.ptr = (u8)c->dst.val;
break;
case 2:
- *(u16 *)dst.ptr = (u16)dst.val;
+ *(u16 *)c->dst.ptr = (u16)c->dst.val;
break;
case 4:
- *dst.ptr = (u32)dst.val;
+ *c->dst.ptr = (u32)c->dst.val;
break; /* 64b: zero-ext */
case 8:
- *dst.ptr = dst.val;
+ *c->dst.ptr = c->dst.val;
break;
}
break;
case OP_MEM:
- if (lock_prefix)
- rc = ops->cmpxchg_emulated((unsigned long)dst.
- ptr, &dst.orig_val,
- &dst.val, dst.bytes,
- ctxt->vcpu);
+ if (c->lock_prefix)
+ rc = ops->cmpxchg_emulated(
+ (unsigned long)c->dst.ptr,
+ &c->dst.orig_val,
+ &c->dst.val,
+ c->dst.bytes,
+ ctxt->vcpu);
else
- rc = ops->write_emulated((unsigned long)dst.ptr,
- &dst.val, dst.bytes,
- ctxt->vcpu);
+ rc = ops->write_emulated(
+ (unsigned long)c->dst.ptr,
+ &c->dst.val,
+ c->dst.bytes,
+ ctxt->vcpu);
if (rc != 0)
goto done;
default:
@@ -1197,173 +1220,185 @@ writeback:
}
/* Commit shadow register state. */
- memcpy(ctxt->vcpu->regs, _regs, sizeof _regs);
+ memcpy(ctxt->vcpu->regs, c->regs, sizeof c->regs);
ctxt->eflags = _eflags;
- ctxt->vcpu->rip = _eip;
+ ctxt->vcpu->rip = c->eip;
done:
return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0;
special_insn:
- if (twobyte)
+ if (c->twobyte)
goto twobyte_special_insn;
- switch(b) {
+ switch (c->b) {
case 0x50 ... 0x57: /* push reg */
- if (op_bytes == 2)
- src.val = (u16) _regs[b & 0x7];
+ if (c->op_bytes == 2)
+ c->src.val = (u16) c->regs[c->b & 0x7];
else
- src.val = (u32) _regs[b & 0x7];
- dst.type = OP_MEM;
- dst.bytes = op_bytes;
- dst.val = src.val;
- register_address_increment(_regs[VCPU_REGS_RSP], -op_bytes);
- dst.ptr = (void *) register_address(
- ctxt->ss_base, _regs[VCPU_REGS_RSP]);
+ c->src.val = (u32) c->regs[c->b & 0x7];
+ c->dst.type = OP_MEM;
+ c->dst.bytes = c->op_bytes;
+ c->dst.val = c->src.val;
+ register_address_increment(c->regs[VCPU_REGS_RSP],
+ -c->op_bytes);
+ c->dst.ptr = (void *) register_address(
+ ctxt->ss_base, c->regs[VCPU_REGS_RSP]);
break;
case 0x58 ... 0x5f: /* pop reg */
- dst.ptr = (unsigned long *)&_regs[b & 0x7];
+ c->dst.ptr =
+ (unsigned long *)&c->regs[c->b & 0x7];
pop_instruction:
if ((rc = ops->read_std(register_address(ctxt->ss_base,
- _regs[VCPU_REGS_RSP]), dst.ptr, op_bytes, ctxt->vcpu))
- != 0)
+ c->regs[VCPU_REGS_RSP]), c->dst.ptr,
+ c->op_bytes, ctxt->vcpu)) != 0)
goto done;
- register_address_increment(_regs[VCPU_REGS_RSP], op_bytes);
+ register_address_increment(c->regs[VCPU_REGS_RSP],
+ c->op_bytes);
no_wb = 1; /* Disable writeback. */
break;
case 0x6a: /* push imm8 */
- src.val = 0L;
- src.val = insn_fetch(s8, 1, _eip);
- push:
- dst.type = OP_MEM;
- dst.bytes = op_bytes;
- dst.val = src.val;
- register_address_increment(_regs[VCPU_REGS_RSP], -op_bytes);
- dst.ptr = (void *) register_address(ctxt->ss_base,
- _regs[VCPU_REGS_RSP]);
+ c->src.val = 0L;
+ c->src.val = insn_fetch(s8, 1, c->eip);
+push:
+ c->dst.type = OP_MEM;
+ c->dst.bytes = c->op_bytes;
+ c->dst.val = c->src.val;
+ register_address_increment(c->regs[VCPU_REGS_RSP],
+ -c->op_bytes);
+ c->dst.ptr = (void *) register_address(ctxt->ss_base,
+ c->regs[VCPU_REGS_RSP]);
break;
case 0x6c: /* insb */
case 0x6d: /* insw/insd */
if (kvm_emulate_pio_string(ctxt->vcpu, NULL,
- 1, /* in */
- (d & ByteOp) ? 1 : op_bytes, /* size */
- rep_prefix ?
- address_mask(_regs[VCPU_REGS_RCX]) : 1, /* count */
- (_eflags & EFLG_DF), /* down */
+ 1,
+ (c->d & ByteOp) ? 1 : c->op_bytes,
+ c->rep_prefix ?
+ address_mask(c->regs[VCPU_REGS_RCX]) : 1,
+ (_eflags & EFLG_DF),
register_address(ctxt->es_base,
- _regs[VCPU_REGS_RDI]), /* address */
- rep_prefix,
- _regs[VCPU_REGS_RDX] /* port */
- ) == 0)
+ c->regs[VCPU_REGS_RDI]),
+ c->rep_prefix,
+ c->regs[VCPU_REGS_RDX]) == 0)
return -1;
return 0;
case 0x6e: /* outsb */
case 0x6f: /* outsw/outsd */
if (kvm_emulate_pio_string(ctxt->vcpu, NULL,
- 0, /* in */
- (d & ByteOp) ? 1 : op_bytes, /* size */
- rep_prefix ?
- address_mask(_regs[VCPU_REGS_RCX]) : 1, /* count */
- (_eflags & EFLG_DF), /* down */
- register_address(override_base ?
- *override_base : ctxt->ds_base,
- _regs[VCPU_REGS_RSI]), /* address */
- rep_prefix,
- _regs[VCPU_REGS_RDX] /* port */
- ) == 0)
+ 0,
+ (c->d & ByteOp) ? 1 : c->op_bytes,
+ c->rep_prefix ?
+ address_mask(c->regs[VCPU_REGS_RCX]) : 1,
+ (_eflags & EFLG_DF),
+ register_address(c->override_base ?
+ *c->override_base :
+ ctxt->ds_base,
+ c->regs[VCPU_REGS_RSI]),
+ c->rep_prefix,
+ c->regs[VCPU_REGS_RDX]) == 0)
return -1;
return 0;
case 0x70 ... 0x7f: /* jcc (short) */ {
- int rel = insn_fetch(s8, 1, _eip);
+ int rel = insn_fetch(s8, 1, c->eip);
- if (test_cc(b, _eflags))
+ if (test_cc(c->b, _eflags))
JMP_REL(rel);
break;
}
case 0x9c: /* pushf */
- src.val = (unsigned long) _eflags;
+ c->src.val = (unsigned long) _eflags;
goto push;
case 0x9d: /* popf */
- dst.ptr = (unsigned long *) &_eflags;
+ c->dst.ptr = (unsigned long *) &_eflags;
goto pop_instruction;
case 0xc3: /* ret */
- dst.ptr = &_eip;
+ c->dst.ptr = &c->eip;
goto pop_instruction;
case 0xf4: /* hlt */
ctxt->vcpu->halt_request = 1;
goto done;
}
- if (rep_prefix) {
- if (_regs[VCPU_REGS_RCX] == 0) {
- ctxt->vcpu->rip = _eip;
+ if (c->rep_prefix) {
+ if (c->regs[VCPU_REGS_RCX] == 0) {
+ ctxt->vcpu->rip = c->eip;
goto done;
}
- _regs[VCPU_REGS_RCX]--;
- _eip = ctxt->vcpu->rip;
+ c->regs[VCPU_REGS_RCX]--;
+ c->eip = ctxt->vcpu->rip;
}
- switch (b) {
+ switch (c->b) {
case 0xa4 ... 0xa5: /* movs */
- dst.type = OP_MEM;
- dst.bytes = (d & ByteOp) ? 1 : op_bytes;
- dst.ptr = (unsigned long *)register_address(ctxt->es_base,
- _regs[VCPU_REGS_RDI]);
+ c->dst.type = OP_MEM;
+ c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ c->dst.ptr = (unsigned long *)register_address(
+ ctxt->es_base,
+ c->regs[VCPU_REGS_RDI]);
if ((rc = ops->read_emulated(register_address(
- override_base ? *override_base : ctxt->ds_base,
- _regs[VCPU_REGS_RSI]), &dst.val, dst.bytes, ctxt->vcpu)) != 0)
+ c->override_base ? *c->override_base :
+ ctxt->ds_base,
+ c->regs[VCPU_REGS_RSI]),
+ &c->dst.val,
+ c->dst.bytes, ctxt->vcpu)) != 0)
goto done;
- register_address_increment(_regs[VCPU_REGS_RSI],
- (_eflags & EFLG_DF) ? -dst.bytes : dst.bytes);
- register_address_increment(_regs[VCPU_REGS_RDI],
- (_eflags & EFLG_DF) ? -dst.bytes : dst.bytes);
+ register_address_increment(c->regs[VCPU_REGS_RSI],
+ (_eflags & EFLG_DF) ? -c->dst.bytes
+ : c->dst.bytes);
+ register_address_increment(c->regs[VCPU_REGS_RDI],
+ (_eflags & EFLG_DF) ? -c->dst.bytes
+ : c->dst.bytes);
break;
case 0xa6 ... 0xa7: /* cmps */
DPRINTF("Urk! I don't handle CMPS.\n");
goto cannot_emulate;
case 0xaa ... 0xab: /* stos */
- dst.type = OP_MEM;
- dst.bytes = (d & ByteOp) ? 1 : op_bytes;
- dst.ptr = (unsigned long *)cr2;
- dst.val = _regs[VCPU_REGS_RAX];
- register_address_increment(_regs[VCPU_REGS_RDI],
- (_eflags & EFLG_DF) ? -dst.bytes : dst.bytes);
+ c->dst.type = OP_MEM;
+ c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ 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
+ : c->dst.bytes);
break;
case 0xac ... 0xad: /* lods */
- dst.type = OP_REG;
- dst.bytes = (d & ByteOp) ? 1 : op_bytes;
- dst.ptr = (unsigned long *)&_regs[VCPU_REGS_RAX];
- if ((rc = ops->read_emulated(cr2, &dst.val, dst.bytes,
+ c->dst.type = OP_REG;
+ c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
+ c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
+ if ((rc = ops->read_emulated(cr2, &c->dst.val,
+ c->dst.bytes,
ctxt->vcpu)) != 0)
goto done;
- register_address_increment(_regs[VCPU_REGS_RSI],
- (_eflags & EFLG_DF) ? -dst.bytes : dst.bytes);
+ register_address_increment(c->regs[VCPU_REGS_RSI],
+ (_eflags & EFLG_DF) ? -c->dst.bytes
+ : c->dst.bytes);
break;
case 0xae ... 0xaf: /* scas */
DPRINTF("Urk! I don't handle SCAS.\n");
goto cannot_emulate;
case 0xe8: /* call (near) */ {
long int rel;
- switch (op_bytes) {
+ switch (c->op_bytes) {
case 2:
- rel = insn_fetch(s16, 2, _eip);
+ rel = insn_fetch(s16, 2, c->eip);
break;
case 4:
- rel = insn_fetch(s32, 4, _eip);
+ rel = insn_fetch(s32, 4, c->eip);
break;
case 8:
- rel = insn_fetch(s64, 8, _eip);
+ rel = insn_fetch(s64, 8, c->eip);
break;
default:
DPRINTF("Call: Invalid op_bytes\n");
goto cannot_emulate;
}
- src.val = (unsigned long) _eip;
+ c->src.val = (unsigned long) c->eip;
JMP_REL(rel);
- op_bytes = ad_bytes;
+ c->op_bytes = c->ad_bytes;
goto push;
}
case 0xe9: /* jmp rel */
case 0xeb: /* jmp rel short */
- JMP_REL(src.val);
+ JMP_REL(c->src.val);
no_wb = 1; /* Disable writeback. */
break;
@@ -1372,16 +1407,16 @@ special_insn:
goto writeback;
twobyte_insn:
- switch (b) {
+ switch (c->b) {
case 0x01: /* lgdt, lidt, lmsw */
/* Disable writeback. */
no_wb = 1;
- switch (modrm_reg) {
+ switch (c->modrm_reg) {
u16 size;
unsigned long address;
case 0: /* vmcall */
- if (modrm_mod != 3 || modrm_rm != 1)
+ if (c->modrm_mod != 3 || c->modrm_rm != 1)
goto cannot_emulate;
rc = kvm_fix_hypercall(ctxt->vcpu);
@@ -1391,37 +1426,37 @@ twobyte_insn:
kvm_emulate_hypercall(ctxt->vcpu);
break;
case 2: /* lgdt */
- rc = read_descriptor(ctxt, ops, src.ptr,
- &size, &address, op_bytes);
+ rc = read_descriptor(ctxt, ops, c->src.ptr,
+ &size, &address, c->op_bytes);
if (rc)
goto done;
realmode_lgdt(ctxt->vcpu, size, address);
break;
case 3: /* lidt/vmmcall */
- if (modrm_mod == 3 && modrm_rm == 1) {
+ if (c->modrm_mod == 3 && c->modrm_rm == 1) {
rc = kvm_fix_hypercall(ctxt->vcpu);
if (rc)
goto done;
kvm_emulate_hypercall(ctxt->vcpu);
} else {
- rc = read_descriptor(ctxt, ops, src.ptr,
+ rc = read_descriptor(ctxt, ops, c->src.ptr,
&size, &address,
- op_bytes);
+ c->op_bytes);
if (rc)
goto done;
realmode_lidt(ctxt->vcpu, size, address);
}
break;
case 4: /* smsw */
- if (modrm_mod != 3)
+ if (c->modrm_mod != 3)
goto cannot_emulate;
- *(u16 *)&_regs[modrm_rm]
+ *(u16 *)&c->regs[c->modrm_rm]
= realmode_get_cr(ctxt->vcpu, 0);
break;
case 6: /* lmsw */
- if (modrm_mod != 3)
+ if (c->modrm_mod != 3)
goto cannot_emulate;
- realmode_lmsw(ctxt->vcpu, (u16)modrm_val, &_eflags);
+ realmode_lmsw(ctxt->vcpu, (u16)c->modrm_val, &_eflags);
break;
case 7: /* invlpg*/
emulate_invlpg(ctxt->vcpu, cr2);
@@ -1432,24 +1467,26 @@ twobyte_insn:
break;
case 0x21: /* mov from dr to reg */
no_wb = 1;
- if (modrm_mod != 3)
+ if (c->modrm_mod != 3)
goto cannot_emulate;
- rc = emulator_get_dr(ctxt, modrm_reg, &_regs[modrm_rm]);
+ rc = emulator_get_dr(ctxt, c->modrm_reg,
+ &c->regs[c->modrm_rm]);
break;
case 0x23: /* mov from reg to dr */
no_wb = 1;
- if (modrm_mod != 3)
+ if (c->modrm_mod != 3)
goto cannot_emulate;
- rc = emulator_set_dr(ctxt, modrm_reg, _regs[modrm_rm]);
+ rc = emulator_set_dr(ctxt, c->modrm_reg,
+ c->regs[c->modrm_rm]);
break;
case 0x40 ... 0x4f: /* cmov */
- dst.val = dst.orig_val = src.val;
+ c->dst.val = c->dst.orig_val = c->src.val;
no_wb = 1;
/*
* First, assume we're decoding an even cmov opcode
* (lsb == 0).
*/
- switch ((b & 15) >> 1) {
+ switch ((c->b & 15) >> 1) {
case 0: /* cmovo */
no_wb = (_eflags & EFLG_OF) ? 0 : 1;
break;
@@ -1477,46 +1514,50 @@ twobyte_insn:
break;
}
/* Odd cmov opcodes (lsb == 1) have inverted sense. */
- no_wb ^= b & 1;
+ no_wb ^= c->b & 1;
break;
case 0xa3:
bt: /* bt */
- src.val &= (dst.bytes << 3) - 1; /* only subword offset */
- emulate_2op_SrcV_nobyte("bt", src, dst, _eflags);
+ /* only subword offset */
+ c->src.val &= (c->dst.bytes << 3) - 1;
+ emulate_2op_SrcV_nobyte("bt", c->src, c->dst, _eflags);
break;
case 0xab:
bts: /* bts */
- src.val &= (dst.bytes << 3) - 1; /* only subword offset */
- emulate_2op_SrcV_nobyte("bts", src, dst, _eflags);
+ /* only subword offset */
+ c->src.val &= (c->dst.bytes << 3) - 1;
+ emulate_2op_SrcV_nobyte("bts", c->src, c->dst, _eflags);
break;
case 0xb0 ... 0xb1: /* cmpxchg */
/*
* Save real source value, then compare EAX against
* destination.
*/
- src.orig_val = src.val;
- src.val = _regs[VCPU_REGS_RAX];
- emulate_2op_SrcV("cmp", src, dst, _eflags);
+ 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) {
/* Success: write back to memory. */
- dst.val = src.orig_val;
+ c->dst.val = c->src.orig_val;
} else {
/* Failure: write the value we saw to EAX. */
- dst.type = OP_REG;
- dst.ptr = (unsigned long *)&_regs[VCPU_REGS_RAX];
+ c->dst.type = OP_REG;
+ c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX];
}
break;
case 0xb3:
btr: /* btr */
- src.val &= (dst.bytes << 3) - 1; /* only subword offset */
- emulate_2op_SrcV_nobyte("btr", src, dst, _eflags);
+ /* only subword offset */
+ c->src.val &= (c->dst.bytes << 3) - 1;
+ emulate_2op_SrcV_nobyte("btr", c->src, c->dst, _eflags);
break;
case 0xb6 ... 0xb7: /* movzx */
- dst.bytes = op_bytes;
- dst.val = (d & ByteOp) ? (u8) src.val : (u16) src.val;
+ c->dst.bytes = c->op_bytes;
+ c->dst.val = (c->d & ByteOp) ? (u8) c->src.val
+ : (u16) c->src.val;
break;
case 0xba: /* Grp8 */
- switch (modrm_reg & 3) {
+ switch (c->modrm_reg & 3) {
case 0:
goto bt;
case 1:
@@ -1529,16 +1570,19 @@ twobyte_insn:
break;
case 0xbb:
btc: /* btc */
- src.val &= (dst.bytes << 3) - 1; /* only subword offset */
- emulate_2op_SrcV_nobyte("btc", src, dst, _eflags);
+ /* only subword offset */
+ c->src.val &= (c->dst.bytes << 3) - 1;
+ emulate_2op_SrcV_nobyte("btc", c->src, c->dst, _eflags);
break;
case 0xbe ... 0xbf: /* movsx */
- dst.bytes = op_bytes;
- dst.val = (d & ByteOp) ? (s8) src.val : (s16) src.val;
+ c->dst.bytes = c->op_bytes;
+ c->dst.val = (c->d & ByteOp) ? (s8) c->src.val :
+ (s16) c->src.val;
break;
case 0xc3: /* movnti */
- dst.bytes = op_bytes;
- dst.val = (op_bytes == 4) ? (u32) src.val : (u64) src.val;
+ c->dst.bytes = c->op_bytes;
+ c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val :
+ (u64) c->src.val;
break;
}
goto writeback;
@@ -1546,7 +1590,7 @@ twobyte_insn:
twobyte_special_insn:
/* Disable writeback. */
no_wb = 1;
- switch (b) {
+ switch (c->b) {
case 0x06:
emulate_clts(ctxt->vcpu);
break;
@@ -1558,56 +1602,59 @@ twobyte_special_insn:
case 0x18: /* Grp16 (prefetch/nop) */
break;
case 0x20: /* mov cr, reg */
- if (modrm_mod != 3)
+ if (c->modrm_mod != 3)
goto cannot_emulate;
- _regs[modrm_rm] = realmode_get_cr(ctxt->vcpu, modrm_reg);
+ c->regs[c->modrm_rm] =
+ realmode_get_cr(ctxt->vcpu, c->modrm_reg);
break;
case 0x22: /* mov reg, cr */
- if (modrm_mod != 3)
+ if (c->modrm_mod != 3)
goto cannot_emulate;
- realmode_set_cr(ctxt->vcpu, modrm_reg, modrm_val, &_eflags);
+ realmode_set_cr(ctxt->vcpu,
+ c->modrm_reg, c->modrm_val, &_eflags);
break;
case 0x30:
/* wrmsr */
- msr_data = (u32)_regs[VCPU_REGS_RAX]
- | ((u64)_regs[VCPU_REGS_RDX] << 32);
- rc = kvm_set_msr(ctxt->vcpu, _regs[VCPU_REGS_RCX], msr_data);
+ msr_data = (u32)c->regs[VCPU_REGS_RAX]
+ | ((u64)c->regs[VCPU_REGS_RDX] << 32);
+ rc = kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data);
if (rc) {
kvm_x86_ops->inject_gp(ctxt->vcpu, 0);
- _eip = ctxt->vcpu->rip;
+ c->eip = ctxt->vcpu->rip;
}
rc = X86EMUL_CONTINUE;
break;
case 0x32:
/* rdmsr */
- rc = kvm_get_msr(ctxt->vcpu, _regs[VCPU_REGS_RCX], &msr_data);
+ rc = kvm_get_msr(ctxt->vcpu,
+ c->regs[VCPU_REGS_RCX], &msr_data);
if (rc) {
kvm_x86_ops->inject_gp(ctxt->vcpu, 0);
- _eip = ctxt->vcpu->rip;
+ c->eip = ctxt->vcpu->rip;
} else {
- _regs[VCPU_REGS_RAX] = (u32)msr_data;
- _regs[VCPU_REGS_RDX] = msr_data >> 32;
+ c->regs[VCPU_REGS_RAX] = (u32)msr_data;
+ c->regs[VCPU_REGS_RDX] = msr_data >> 32;
}
rc = X86EMUL_CONTINUE;
break;
case 0x80 ... 0x8f: /* jnz rel, etc*/ {
long int rel;
- switch (op_bytes) {
+ switch (c->op_bytes) {
case 2:
- rel = insn_fetch(s16, 2, _eip);
+ rel = insn_fetch(s16, 2, c->eip);
break;
case 4:
- rel = insn_fetch(s32, 4, _eip);
+ rel = insn_fetch(s32, 4, c->eip);
break;
case 8:
- rel = insn_fetch(s64, 8, _eip);
+ rel = insn_fetch(s64, 8, c->eip);
break;
default:
DPRINTF("jnz: Invalid op_bytes\n");
goto cannot_emulate;
}
- if (test_cc(b, _eflags))
+ if (test_cc(c->b, _eflags))
JMP_REL(rel);
break;
}
@@ -1617,14 +1664,16 @@ twobyte_special_insn:
if ((rc = ops->read_emulated(cr2, &old, 8, ctxt->vcpu))
!= 0)
goto done;
- if (((u32) (old >> 0) != (u32) _regs[VCPU_REGS_RAX]) ||
- ((u32) (old >> 32) != (u32) _regs[VCPU_REGS_RDX])) {
- _regs[VCPU_REGS_RAX] = (u32) (old >> 0);
- _regs[VCPU_REGS_RDX] = (u32) (old >> 32);
+ if (((u32) (old >> 0) !=
+ (u32) c->regs[VCPU_REGS_RAX]) ||
+ ((u32) (old >> 32) !=
+ (u32) c->regs[VCPU_REGS_RDX])) {
+ c->regs[VCPU_REGS_RAX] = (u32) (old >> 0);
+ c->regs[VCPU_REGS_RDX] = (u32) (old >> 32);
_eflags &= ~EFLG_ZF;
} else {
- new = ((u64)_regs[VCPU_REGS_RCX] << 32)
- | (u32) _regs[VCPU_REGS_RBX];
+ new = ((u64)c->regs[VCPU_REGS_RCX] << 32)
+ | (u32) c->regs[VCPU_REGS_RBX];
if ((rc = ops->cmpxchg_emulated(cr2, &old,
&new, 8, ctxt->vcpu)) != 0)
goto done;
@@ -1636,6 +1685,6 @@ twobyte_special_insn:
goto writeback;
cannot_emulate:
- DPRINTF("Cannot emulate %02x\n", b);
+ DPRINTF("Cannot emulate %02x\n", c->b);
return -1;
}
diff --git a/drivers/kvm/x86_emulate.h b/drivers/kvm/x86_emulate.h
index 92c73aa7f9a..c354200d583 100644
--- a/drivers/kvm/x86_emulate.h
+++ b/drivers/kvm/x86_emulate.h
@@ -112,6 +112,36 @@ struct x86_emulate_ops {
};
+/* Type, address-of, and value of an instruction's operand. */
+struct operand {
+ enum { OP_REG, OP_MEM, OP_IMM } type;
+ unsigned int bytes;
+ unsigned long val, orig_val, *ptr;
+};
+
+struct decode_cache {
+ u8 twobyte;
+ u8 b;
+ u8 lock_prefix;
+ u8 rep_prefix;
+ u8 op_bytes;
+ u8 ad_bytes;
+ struct operand src;
+ struct operand dst;
+ unsigned long *override_base;
+ unsigned int d;
+ unsigned long regs[NR_VCPU_REGS];
+ unsigned long eip;
+ /* modrm */
+ u8 modrm;
+ u8 modrm_mod;
+ u8 modrm_reg;
+ u8 modrm_rm;
+ u8 use_modrm_ea;
+ unsigned long modrm_ea;
+ unsigned long modrm_val;
+};
+
struct x86_emulate_ctxt {
/* Register state before/after emulation. */
struct kvm_vcpu *vcpu;
@@ -129,6 +159,10 @@ struct x86_emulate_ctxt {
unsigned long ss_base;
unsigned long gs_base;
unsigned long fs_base;
+
+ /* decode cache */
+
+ struct decode_cache decode;
};
/* Execution mode, passed to the emulator. */
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-22 16:33:40 +0000