Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 156 +++++++++++++++++++----------------------------
1 files changed, 63 insertions(+), 93 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 17a8910..e46809b 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -44,8 +44,15 @@
#define OpImmByte 10ull /* 8-bit sign extended immediate */
#define OpOne 11ull /* Implied 1 */
#define OpImm 12ull /* Sign extended immediate */
-
-#define OpBits 4 /* Width of operand field */
+#define OpMem16 13ull /* Memory operand (16-bit). */
+#define OpMem32 14ull /* Memory operand (32-bit). */
+#define OpImmU 15ull /* Immediate operand, zero extended */
+#define OpSI 16ull /* SI/ESI/RSI */
+#define OpImmFAddr 17ull /* Immediate far address */
+#define OpMemFAddr 18ull /* Far address in memory */
+#define OpImmU16 19ull /* Immediate operand, 16 bits, zero extended */
+
+#define OpBits 5 /* Width of operand field */
#define OpMask ((1ull << OpBits) - 1)
/*
@@ -71,23 +78,24 @@
#define DstDX (OpDX << DstShift)
#define DstMask (OpMask << DstShift)
/* Source operand type. */
-#define SrcNone (0<<5) /* No source operand. */
-#define SrcReg (1<<5) /* Register operand. */
-#define SrcMem (2<<5) /* Memory operand. */
-#define SrcMem16 (3<<5) /* Memory operand (16-bit). */
-#define SrcMem32 (4<<5) /* Memory operand (32-bit). */
-#define SrcImm (5<<5) /* Immediate operand. */
-#define SrcImmByte (6<<5) /* 8-bit sign-extended immediate operand. */
-#define SrcOne (7<<5) /* Implied '1' */
-#define SrcImmUByte (8<<5) /* 8-bit unsigned immediate operand. */
-#define SrcImmU (9<<5) /* Immediate operand, unsigned */
-#define SrcSI (0xa<<5) /* Source is in the DS:RSI */
-#define SrcImmFAddr (0xb<<5) /* Source is immediate far address */
-#define SrcMemFAddr (0xc<<5) /* Source is far address in memory */
-#define SrcAcc (0xd<<5) /* Source Accumulator */
-#define SrcImmU16 (0xe<<5) /* Immediate operand, unsigned, 16 bits */
-#define SrcDX (0xf<<5) /* Source is in DX register */
-#define SrcMask (0xf<<5)
+#define SrcShift 6
+#define SrcNone (OpNone << SrcShift)
+#define SrcReg (OpReg << SrcShift)
+#define SrcMem (OpMem << SrcShift)
+#define SrcMem16 (OpMem16 << SrcShift)
+#define SrcMem32 (OpMem32 << SrcShift)
+#define SrcImm (OpImm << SrcShift)
+#define SrcImmByte (OpImmByte << SrcShift)
+#define SrcOne (OpOne << SrcShift)
+#define SrcImmUByte (OpImmUByte << SrcShift)
+#define SrcImmU (OpImmU << SrcShift)
+#define SrcSI (OpSI << SrcShift)
+#define SrcImmFAddr (OpImmFAddr << SrcShift)
+#define SrcMemFAddr (OpMemFAddr << SrcShift)
+#define SrcAcc (OpAcc << SrcShift)
+#define SrcImmU16 (OpImmU16 << SrcShift)
+#define SrcDX (OpDX << SrcShift)
+#define SrcMask (OpMask << SrcShift)
#define BitOp (1<<11)
#define MemAbs (1<<12) /* Memory operand is absolute displacement */
#define String (1<<13) /* String instruction (rep capable) */
@@ -3354,13 +3362,14 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
break;
case OpMem:
case OpMem64:
- *op = ctxt->memop;
- ctxt->memopp = op;
if (d == OpMem64)
- op->bytes = 8;
+ ctxt->memop.bytes = 8;
else
- op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
- if (ctxt->d & BitOp)
+ ctxt->memop.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
+ mem_common:
+ *op = ctxt->memop;
+ ctxt->memopp = op;
+ if ((ctxt->d & BitOp) && op == &ctxt->dst)
fetch_bit_operand(ctxt);
op->orig_val = op->val;
break;
@@ -3399,6 +3408,35 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
case OpImm:
rc = decode_imm(ctxt, op, imm_size(ctxt), true);
break;
+ case OpMem16:
+ ctxt->memop.bytes = 2;
+ goto mem_common;
+ case OpMem32:
+ ctxt->memop.bytes = 4;
+ goto mem_common;
+ case OpImmU16:
+ rc = decode_imm(ctxt, op, 2, false);
+ break;
+ case OpImmU:
+ rc = decode_imm(ctxt, op, imm_size(ctxt), false);
+ break;
+ case OpSI:
+ op->type = OP_MEM;
+ op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
+ op->addr.mem.ea =
+ register_address(ctxt, ctxt->regs[VCPU_REGS_RSI]);
+ op->addr.mem.seg = seg_override(ctxt);
+ op->val = 0;
+ break;
+ case OpImmFAddr:
+ op->type = OP_IMM;
+ op->addr.mem.ea = ctxt->_eip;
+ op->bytes = ctxt->op_bytes + 2;
+ insn_fetch_arr(op->valptr, op->bytes, ctxt);
+ break;
+ case OpMemFAddr:
+ ctxt->memop.bytes = ctxt->op_bytes + 2;
+ goto mem_common;
case OpImplicit:
/* Special instructions do their own operand decoding. */
default:
@@ -3597,75 +3635,7 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
* Decode and fetch the source operand: register, memory
* or immediate.
*/
- switch (ctxt->d & SrcMask) {
- case SrcNone:
- break;
- case SrcReg:
- decode_register_operand(ctxt, &ctxt->src, 0);
- break;
- case SrcMem16:
- ctxt->memop.bytes = 2;
- goto srcmem_common;
- case SrcMem32:
- ctxt->memop.bytes = 4;
- goto srcmem_common;
- case SrcMem:
- ctxt->memop.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
- srcmem_common:
- ctxt->src = ctxt->memop;
- ctxt->memopp = &ctxt->src;
- break;
- case SrcImmU16:
- rc = decode_imm(ctxt, &ctxt->src, 2, false);
- break;
- case SrcImm:
- rc = decode_imm(ctxt, &ctxt->src, imm_size(ctxt), true);
- break;
- case SrcImmU:
- rc = decode_imm(ctxt, &ctxt->src, imm_size(ctxt), false);
- break;
- case SrcImmByte:
- rc = decode_imm(ctxt, &ctxt->src, 1, true);
- break;
- case SrcImmUByte:
- rc = decode_imm(ctxt, &ctxt->src, 1, false);
- break;
- case SrcAcc:
- ctxt->src.type = OP_REG;
- ctxt->src.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
- ctxt->src.addr.reg = &ctxt->regs[VCPU_REGS_RAX];
- fetch_register_operand(&ctxt->src);
- break;
- case SrcOne:
- ctxt->src.bytes = 1;
- ctxt->src.val = 1;
- break;
- case SrcSI:
- ctxt->src.type = OP_MEM;
- ctxt->src.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
- ctxt->src.addr.mem.ea =
- register_address(ctxt, ctxt->regs[VCPU_REGS_RSI]);
- ctxt->src.addr.mem.seg = seg_override(ctxt);
- ctxt->src.val = 0;
- break;
- case SrcImmFAddr:
- ctxt->src.type = OP_IMM;
- ctxt->src.addr.mem.ea = ctxt->_eip;
- ctxt->src.bytes = ctxt->op_bytes + 2;
- insn_fetch_arr(ctxt->src.valptr, ctxt->src.bytes, ctxt);
- break;
- case SrcMemFAddr:
- ctxt->memop.bytes = ctxt->op_bytes + 2;
- goto srcmem_common;
- break;
- case SrcDX:
- ctxt->src.type = OP_REG;
- ctxt->src.bytes = 2;
- ctxt->src.addr.reg = &ctxt->regs[VCPU_REGS_RDX];
- fetch_register_operand(&ctxt->src);
- break;
- }
-
+ rc = decode_operand(ctxt, &ctxt->src, (ctxt->d >> SrcShift) & OpMask);
if (rc != X86EMUL_CONTINUE)
goto done;
--
1.7.6.1
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