From 0fe591288470aebba4104b17513c9ad5050f9d0d Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Tue, 13 Sep 2011 10:45:47 +0300 Subject: [PATCH] KVM: x86 emulator: switch src decode to decode_operand() Signed-off-by: Avi Kivity Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/emulate.c | 156 +++++++++++++++++------------------------ 1 file changed, 63 insertions(+), 93 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 17a8910f28ce..e46809b8f31b 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 @@ done_prefixes: * 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; -- 2.30.2