--- /dev/null
+/******************************************************************************
+ * emulate.c
+ *
+ * Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
+ *
+ * Copyright (c) 2005 Keir Fraser
+ *
+ * Linux coding style, mod r/m decoder, segment base fixes, real-mode
+ * privileged instructions:
+ *
+ * Copyright (C) 2006 Qumranet
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
+ *
+ * Avi Kivity <avi@qumranet.com>
+ * Yaniv Kamay <yaniv@qumranet.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
+ */
+
+#include <linux/kvm_host.h>
+#include "kvm_cache_regs.h"
+#include <linux/module.h>
+#include <asm/kvm_emulate.h>
+#include <linux/stringify.h>
+
+#include "x86.h"
+#include "tss.h"
+
+/*
+ * Operand types
+ */
+#define OpNone 0ull
+#define OpImplicit 1ull /* No generic decode */
+#define OpReg 2ull /* Register */
+#define OpMem 3ull /* Memory */
+#define OpAcc 4ull /* Accumulator: AL/AX/EAX/RAX */
+#define OpDI 5ull /* ES:DI/EDI/RDI */
+#define OpMem64 6ull /* Memory, 64-bit */
+#define OpImmUByte 7ull /* Zero-extended 8-bit immediate */
+#define OpDX 8ull /* DX register */
+#define OpCL 9ull /* CL register (for shifts) */
+#define OpImmByte 10ull /* 8-bit sign extended immediate */
+#define OpOne 11ull /* Implied 1 */
+#define OpImm 12ull /* Sign extended up to 32-bit immediate */
+#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 OpES 20ull /* ES */
+#define OpCS 21ull /* CS */
+#define OpSS 22ull /* SS */
+#define OpDS 23ull /* DS */
+#define OpFS 24ull /* FS */
+#define OpGS 25ull /* GS */
+#define OpMem8 26ull /* 8-bit zero extended memory operand */
+#define OpImm64 27ull /* Sign extended 16/32/64-bit immediate */
+#define OpXLat 28ull /* memory at BX/EBX/RBX + zero-extended AL */
+#define OpAccLo 29ull /* Low part of extended acc (AX/AX/EAX/RAX) */
+#define OpAccHi 30ull /* High part of extended acc (-/DX/EDX/RDX) */
+
+#define OpBits 5 /* Width of operand field */
+#define OpMask ((1ull << OpBits) - 1)
+
+/*
+ * Opcode effective-address decode tables.
+ * Note that we only emulate instructions that have at least one memory
+ * operand (excluding implicit stack references). We assume that stack
+ * references and instruction fetches will never occur in special memory
+ * areas that require emulation. So, for example, 'mov <imm>,<reg>' need
+ * not be handled.
+ */
+
+/* Operand sizes: 8-bit operands or specified/overridden size. */
+#define ByteOp (1<<0) /* 8-bit operands. */
+/* Destination operand type. */
+#define DstShift 1
+#define ImplicitOps (OpImplicit << DstShift)
+#define DstReg (OpReg << DstShift)
+#define DstMem (OpMem << DstShift)
+#define DstAcc (OpAcc << DstShift)
+#define DstDI (OpDI << DstShift)
+#define DstMem64 (OpMem64 << DstShift)
+#define DstMem16 (OpMem16 << DstShift)
+#define DstImmUByte (OpImmUByte << DstShift)
+#define DstDX (OpDX << DstShift)
+#define DstAccLo (OpAccLo << DstShift)
+#define DstMask (OpMask << DstShift)
+/* Source operand type. */
+#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 SrcXLat (OpXLat << SrcShift)
+#define SrcImmFAddr (OpImmFAddr << SrcShift)
+#define SrcMemFAddr (OpMemFAddr << SrcShift)
+#define SrcAcc (OpAcc << SrcShift)
+#define SrcImmU16 (OpImmU16 << SrcShift)
+#define SrcImm64 (OpImm64 << SrcShift)
+#define SrcDX (OpDX << SrcShift)
+#define SrcMem8 (OpMem8 << SrcShift)
+#define SrcAccHi (OpAccHi << 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) */
+#define Stack (1<<14) /* Stack instruction (push/pop) */
+#define GroupMask (7<<15) /* Opcode uses one of the group mechanisms */
+#define Group (1<<15) /* Bits 3:5 of modrm byte extend opcode */
+#define GroupDual (2<<15) /* Alternate decoding of mod == 3 */
+#define Prefix (3<<15) /* Instruction varies with 66/f2/f3 prefix */
+#define RMExt (4<<15) /* Opcode extension in ModRM r/m if mod == 3 */
+#define Escape (5<<15) /* Escape to coprocessor instruction */
+#define InstrDual (6<<15) /* Alternate instruction decoding of mod == 3 */
+#define ModeDual (7<<15) /* Different instruction for 32/64 bit */
+#define Sse (1<<18) /* SSE Vector instruction */
+/* Generic ModRM decode. */
+#define ModRM (1<<19)
+/* Destination is only written; never read. */
+#define Mov (1<<20)
+/* Misc flags */
+#define Prot (1<<21) /* instruction generates #UD if not in prot-mode */
+#define EmulateOnUD (1<<22) /* Emulate if unsupported by the host */
+#define NoAccess (1<<23) /* Don't access memory (lea/invlpg/verr etc) */
+#define Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */
+#define Undefined (1<<25) /* No Such Instruction */
+#define Lock (1<<26) /* lock prefix is allowed for the instruction */
+#define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
+#define No64 (1<<28)
+#define PageTable (1 << 29) /* instruction used to write page table */
+#define NotImpl (1 << 30) /* instruction is not implemented */
+/* Source 2 operand type */
+#define Src2Shift (31)
+#define Src2None (OpNone << Src2Shift)
+#define Src2Mem (OpMem << Src2Shift)
+#define Src2CL (OpCL << Src2Shift)
+#define Src2ImmByte (OpImmByte << Src2Shift)
+#define Src2One (OpOne << Src2Shift)
+#define Src2Imm (OpImm << Src2Shift)
+#define Src2ES (OpES << Src2Shift)
+#define Src2CS (OpCS << Src2Shift)
+#define Src2SS (OpSS << Src2Shift)
+#define Src2DS (OpDS << Src2Shift)
+#define Src2FS (OpFS << Src2Shift)
+#define Src2GS (OpGS << Src2Shift)
+#define Src2Mask (OpMask << Src2Shift)
+#define Mmx ((u64)1 << 40) /* MMX Vector instruction */
+#define Aligned ((u64)1 << 41) /* Explicitly aligned (e.g. MOVDQA) */
+#define Unaligned ((u64)1 << 42) /* Explicitly unaligned (e.g. MOVDQU) */
+#define Avx ((u64)1 << 43) /* Advanced Vector Extensions */
+#define Fastop ((u64)1 << 44) /* Use opcode::u.fastop */
+#define NoWrite ((u64)1 << 45) /* No writeback */
+#define SrcWrite ((u64)1 << 46) /* Write back src operand */
+#define NoMod ((u64)1 << 47) /* Mod field is ignored */
+#define Intercept ((u64)1 << 48) /* Has valid intercept field */
+#define CheckPerm ((u64)1 << 49) /* Has valid check_perm field */
+#define PrivUD ((u64)1 << 51) /* #UD instead of #GP on CPL > 0 */
+#define NearBranch ((u64)1 << 52) /* Near branches */
+#define No16 ((u64)1 << 53) /* No 16 bit operand */
+#define IncSP ((u64)1 << 54) /* SP is incremented before ModRM calc */
+
+#define DstXacc (DstAccLo | SrcAccHi | SrcWrite)
+
+#define X2(x...) x, x
+#define X3(x...) X2(x), x
+#define X4(x...) X2(x), X2(x)
+#define X5(x...) X4(x), x
+#define X6(x...) X4(x), X2(x)
+#define X7(x...) X4(x), X3(x)
+#define X8(x...) X4(x), X4(x)
+#define X16(x...) X8(x), X8(x)
+
+#define NR_FASTOP (ilog2(sizeof(ulong)) + 1)
+#define FASTOP_SIZE 8
+
+/*
+ * fastop functions have a special calling convention:
+ *
+ * dst: rax (in/out)
+ * src: rdx (in/out)
+ * src2: rcx (in)
+ * flags: rflags (in/out)
+ * ex: rsi (in:fastop pointer, out:zero if exception)
+ *
+ * Moreover, they are all exactly FASTOP_SIZE bytes long, so functions for
+ * different operand sizes can be reached by calculation, rather than a jump
+ * table (which would be bigger than the code).
+ *
+ * fastop functions are declared as taking a never-defined fastop parameter,
+ * so they can't be called from C directly.
+ */
+
+struct fastop;
+
+struct opcode {
+ u64 flags : 56;
+ u64 intercept : 8;
+ union {
+ int (*execute)(struct x86_emulate_ctxt *ctxt);
+ const struct opcode *group;
+ const struct group_dual *gdual;
+ const struct gprefix *gprefix;
+ const struct escape *esc;
+ const struct instr_dual *idual;
+ const struct mode_dual *mdual;
+ void (*fastop)(struct fastop *fake);
+ } u;
+ int (*check_perm)(struct x86_emulate_ctxt *ctxt);
+};
+
+struct group_dual {
+ struct opcode mod012[8];
+ struct opcode mod3[8];
+};
+
+struct gprefix {
+ struct opcode pfx_no;
+ struct opcode pfx_66;
+ struct opcode pfx_f2;
+ struct opcode pfx_f3;
+};
+
+struct escape {
+ struct opcode op[8];
+ struct opcode high[64];
+};
+
+struct instr_dual {
+ struct opcode mod012;
+ struct opcode mod3;
+};
+
+struct mode_dual {
+ struct opcode mode32;
+ struct opcode mode64;
+};
+
+#define EFLG_RESERVED_ZEROS_MASK 0xffc0802a
+
+enum x86_transfer_type {
+ X86_TRANSFER_NONE,
+ X86_TRANSFER_CALL_JMP,
+ X86_TRANSFER_RET,
+ X86_TRANSFER_TASK_SWITCH,
+};
+
+static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr)
+{
+ if (!(ctxt->regs_valid & (1 << nr))) {
+ ctxt->regs_valid |= 1 << nr;
+ ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr);
+ }
+ return ctxt->_regs[nr];
+}
+
+static ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr)
+{
+ ctxt->regs_valid |= 1 << nr;
+ ctxt->regs_dirty |= 1 << nr;
+ return &ctxt->_regs[nr];
+}
+
+static ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr)
+{
+ reg_read(ctxt, nr);
+ return reg_write(ctxt, nr);
+}
+
+static void writeback_registers(struct x86_emulate_ctxt *ctxt)
+{
+ unsigned reg;
+
+ for_each_set_bit(reg, (ulong *)&ctxt->regs_dirty, 16)
+ ctxt->ops->write_gpr(ctxt, reg, ctxt->_regs[reg]);
+}
+
+static void invalidate_registers(struct x86_emulate_ctxt *ctxt)
+{
+ ctxt->regs_dirty = 0;
+ ctxt->regs_valid = 0;
+}
+
+/*
+ * These EFLAGS bits are restored from saved value during emulation, and
+ * any changes are written back to the saved value after emulation.
+ */
+#define EFLAGS_MASK (X86_EFLAGS_OF|X86_EFLAGS_SF|X86_EFLAGS_ZF|X86_EFLAGS_AF|\
+ X86_EFLAGS_PF|X86_EFLAGS_CF)
+
+#ifdef CONFIG_X86_64
+#define ON64(x) x
+#else
+#define ON64(x)
+#endif
+
+static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *));
+
+#define FOP_ALIGN ".align " __stringify(FASTOP_SIZE) " \n\t"
+#define FOP_RET "ret \n\t"
+
+#define FOP_START(op) \
+ extern void em_##op(struct fastop *fake); \
+ asm(".pushsection .text, \"ax\" \n\t" \
+ ".global em_" #op " \n\t" \
+ FOP_ALIGN \
+ "em_" #op ": \n\t"
+
+#define FOP_END \
+ ".popsection")
+
+#define FOPNOP() FOP_ALIGN FOP_RET
+
+#define FOP1E(op, dst) \
+ FOP_ALIGN "10: " #op " %" #dst " \n\t" FOP_RET
+
+#define FOP1EEX(op, dst) \
+ FOP1E(op, dst) _ASM_EXTABLE(10b, kvm_fastop_exception)
+
+#define FASTOP1(op) \
+ FOP_START(op) \
+ FOP1E(op##b, al) \
+ FOP1E(op##w, ax) \
+ FOP1E(op##l, eax) \
+ ON64(FOP1E(op##q, rax)) \
+ FOP_END
+
+/* 1-operand, using src2 (for MUL/DIV r/m) */
+#define FASTOP1SRC2(op, name) \
+ FOP_START(name) \
+ FOP1E(op, cl) \
+ FOP1E(op, cx) \
+ FOP1E(op, ecx) \
+ ON64(FOP1E(op, rcx)) \
+ FOP_END
+
+/* 1-operand, using src2 (for MUL/DIV r/m), with exceptions */
+#define FASTOP1SRC2EX(op, name) \
+ FOP_START(name) \
+ FOP1EEX(op, cl) \
+ FOP1EEX(op, cx) \
+ FOP1EEX(op, ecx) \
+ ON64(FOP1EEX(op, rcx)) \
+ FOP_END
+
+#define FOP2E(op, dst, src) \
+ FOP_ALIGN #op " %" #src ", %" #dst " \n\t" FOP_RET
+
+#define FASTOP2(op) \
+ FOP_START(op) \
+ FOP2E(op##b, al, dl) \
+ FOP2E(op##w, ax, dx) \
+ FOP2E(op##l, eax, edx) \
+ ON64(FOP2E(op##q, rax, rdx)) \
+ FOP_END
+
+/* 2 operand, word only */
+#define FASTOP2W(op) \
+ FOP_START(op) \
+ FOPNOP() \
+ FOP2E(op##w, ax, dx) \
+ FOP2E(op##l, eax, edx) \
+ ON64(FOP2E(op##q, rax, rdx)) \
+ FOP_END
+
+/* 2 operand, src is CL */
+#define FASTOP2CL(op) \
+ FOP_START(op) \
+ FOP2E(op##b, al, cl) \
+ FOP2E(op##w, ax, cl) \
+ FOP2E(op##l, eax, cl) \
+ ON64(FOP2E(op##q, rax, cl)) \
+ FOP_END
+
+/* 2 operand, src and dest are reversed */
+#define FASTOP2R(op, name) \
+ FOP_START(name) \
+ FOP2E(op##b, dl, al) \
+ FOP2E(op##w, dx, ax) \
+ FOP2E(op##l, edx, eax) \
+ ON64(FOP2E(op##q, rdx, rax)) \
+ FOP_END
+
+#define FOP3E(op, dst, src, src2) \
+ FOP_ALIGN #op " %" #src2 ", %" #src ", %" #dst " \n\t" FOP_RET
+
+/* 3-operand, word-only, src2=cl */
+#define FASTOP3WCL(op) \
+ FOP_START(op) \
+ FOPNOP() \
+ FOP3E(op##w, ax, dx, cl) \
+ FOP3E(op##l, eax, edx, cl) \
+ ON64(FOP3E(op##q, rax, rdx, cl)) \
+ FOP_END
+
+/* Special case for SETcc - 1 instruction per cc */
+#define FOP_SETCC(op) ".align 4; " #op " %al; ret \n\t"
+
+asm(".global kvm_fastop_exception \n"
+ "kvm_fastop_exception: xor %esi, %esi; ret");
+
+FOP_START(setcc)
+FOP_SETCC(seto)
+FOP_SETCC(setno)
+FOP_SETCC(setc)
+FOP_SETCC(setnc)
+FOP_SETCC(setz)
+FOP_SETCC(setnz)
+FOP_SETCC(setbe)
+FOP_SETCC(setnbe)
+FOP_SETCC(sets)
+FOP_SETCC(setns)
+FOP_SETCC(setp)
+FOP_SETCC(setnp)
+FOP_SETCC(setl)
+FOP_SETCC(setnl)
+FOP_SETCC(setle)
+FOP_SETCC(setnle)
+FOP_END;
+
+FOP_START(salc) "pushf; sbb %al, %al; popf \n\t" FOP_RET
+FOP_END;
+
+static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt,
+ enum x86_intercept intercept,
+ enum x86_intercept_stage stage)
+{
+ struct x86_instruction_info info = {
+ .intercept = intercept,
+ .rep_prefix = ctxt->rep_prefix,
+ .modrm_mod = ctxt->modrm_mod,
+ .modrm_reg = ctxt->modrm_reg,
+ .modrm_rm = ctxt->modrm_rm,
+ .src_val = ctxt->src.val64,
+ .dst_val = ctxt->dst.val64,
+ .src_bytes = ctxt->src.bytes,
+ .dst_bytes = ctxt->dst.bytes,
+ .ad_bytes = ctxt->ad_bytes,
+ .next_rip = ctxt->eip,
+ };
+
+ return ctxt->ops->intercept(ctxt, &info, stage);
+}
+
+static void assign_masked(ulong *dest, ulong src, ulong mask)
+{
+ *dest = (*dest & ~mask) | (src & mask);
+}
+
+static void assign_register(unsigned long *reg, u64 val, int bytes)
+{
+ /* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */
+ switch (bytes) {
+ case 1:
+ *(u8 *)reg = (u8)val;
+ break;
+ case 2:
+ *(u16 *)reg = (u16)val;
+ break;
+ case 4:
+ *reg = (u32)val;
+ break; /* 64b: zero-extend */
+ case 8:
+ *reg = val;
+ break;
+ }
+}
+
+static inline unsigned long ad_mask(struct x86_emulate_ctxt *ctxt)
+{
+ return (1UL << (ctxt->ad_bytes << 3)) - 1;
+}
+
+static ulong stack_mask(struct x86_emulate_ctxt *ctxt)
+{
+ u16 sel;
+ struct desc_struct ss;
+
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ return ~0UL;
+ ctxt->ops->get_segment(ctxt, &sel, &ss, NULL, VCPU_SREG_SS);
+ return ~0U >> ((ss.d ^ 1) * 16); /* d=0: 0xffff; d=1: 0xffffffff */
+}
+
+static int stack_size(struct x86_emulate_ctxt *ctxt)
+{
+ return (__fls(stack_mask(ctxt)) + 1) >> 3;
+}
+
+/* Access/update address held in a register, based on addressing mode. */
+static inline unsigned long
+address_mask(struct x86_emulate_ctxt *ctxt, unsigned long reg)
+{
+ if (ctxt->ad_bytes == sizeof(unsigned long))
+ return reg;
+ else
+ return reg & ad_mask(ctxt);
+}
+
+static inline unsigned long
+register_address(struct x86_emulate_ctxt *ctxt, int reg)
+{
+ return address_mask(ctxt, reg_read(ctxt, reg));
+}
+
+static void masked_increment(ulong *reg, ulong mask, int inc)
+{
+ assign_masked(reg, *reg + inc, mask);
+}
+
+static inline void
+register_address_increment(struct x86_emulate_ctxt *ctxt, int reg, int inc)
+{
+ ulong mask;
+
+ if (ctxt->ad_bytes == sizeof(unsigned long))
+ mask = ~0UL;
+ else
+ mask = ad_mask(ctxt);
+ masked_increment(reg_rmw(ctxt, reg), mask, inc);
+}
+
+static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc)
+{
+ masked_increment(reg_rmw(ctxt, VCPU_REGS_RSP), stack_mask(ctxt), inc);
+}
+
+static u32 desc_limit_scaled(struct desc_struct *desc)
+{
+ u32 limit = get_desc_limit(desc);
+
+ return desc->g ? (limit << 12) | 0xfff : limit;
+}
+
+static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg)
+{
+ if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS)
+ return 0;
+
+ return ctxt->ops->get_cached_segment_base(ctxt, seg);
+}
+
+static int emulate_exception(struct x86_emulate_ctxt *ctxt, int vec,
+ u32 error, bool valid)
+{
+ WARN_ON(vec > 0x1f);
+ ctxt->exception.vector = vec;
+ ctxt->exception.error_code = error;
+ ctxt->exception.error_code_valid = valid;
+ return X86EMUL_PROPAGATE_FAULT;
+}
+
+static int emulate_db(struct x86_emulate_ctxt *ctxt)
+{
+ return emulate_exception(ctxt, DB_VECTOR, 0, false);
+}
+
+static int emulate_gp(struct x86_emulate_ctxt *ctxt, int err)
+{
+ return emulate_exception(ctxt, GP_VECTOR, err, true);
+}
+
+static int emulate_ss(struct x86_emulate_ctxt *ctxt, int err)
+{
+ return emulate_exception(ctxt, SS_VECTOR, err, true);
+}
+
+static int emulate_ud(struct x86_emulate_ctxt *ctxt)
+{
+ return emulate_exception(ctxt, UD_VECTOR, 0, false);
+}
+
+static int emulate_ts(struct x86_emulate_ctxt *ctxt, int err)
+{
+ return emulate_exception(ctxt, TS_VECTOR, err, true);
+}
+
+static int emulate_de(struct x86_emulate_ctxt *ctxt)
+{
+ return emulate_exception(ctxt, DE_VECTOR, 0, false);
+}
+
+static int emulate_nm(struct x86_emulate_ctxt *ctxt)
+{
+ return emulate_exception(ctxt, NM_VECTOR, 0, false);
+}
+
+static u16 get_segment_selector(struct x86_emulate_ctxt *ctxt, unsigned seg)
+{
+ u16 selector;
+ struct desc_struct desc;
+
+ ctxt->ops->get_segment(ctxt, &selector, &desc, NULL, seg);
+ return selector;
+}
+
+static void set_segment_selector(struct x86_emulate_ctxt *ctxt, u16 selector,
+ unsigned seg)
+{
+ u16 dummy;
+ u32 base3;
+ struct desc_struct desc;
+
+ ctxt->ops->get_segment(ctxt, &dummy, &desc, &base3, seg);
+ ctxt->ops->set_segment(ctxt, selector, &desc, base3, seg);
+}
+
+/*
+ * x86 defines three classes of vector instructions: explicitly
+ * aligned, explicitly unaligned, and the rest, which change behaviour
+ * depending on whether they're AVX encoded or not.
+ *
+ * Also included is CMPXCHG16B which is not a vector instruction, yet it is
+ * subject to the same check.
+ */
+static bool insn_aligned(struct x86_emulate_ctxt *ctxt, unsigned size)
+{
+ if (likely(size < 16))
+ return false;
+
+ if (ctxt->d & Aligned)
+ return true;
+ else if (ctxt->d & Unaligned)
+ return false;
+ else if (ctxt->d & Avx)
+ return false;
+ else
+ return true;
+}
+
+static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt,
+ struct segmented_address addr,
+ unsigned *max_size, unsigned size,
+ bool write, bool fetch,
+ enum x86emul_mode mode, ulong *linear)
+{
+ struct desc_struct desc;
+ bool usable;
+ ulong la;
+ u32 lim;
+ u16 sel;
+
+ la = seg_base(ctxt, addr.seg) + addr.ea;
+ *max_size = 0;
+ switch (mode) {
+ case X86EMUL_MODE_PROT64:
+ if (is_noncanonical_address(la))
+ goto bad;
+
+ *max_size = min_t(u64, ~0u, (1ull << 48) - la);
+ if (size > *max_size)
+ goto bad;
+ break;
+ default:
+ usable = ctxt->ops->get_segment(ctxt, &sel, &desc, NULL,
+ addr.seg);
+ if (!usable)
+ goto bad;
+ /* code segment in protected mode or read-only data segment */
+ if ((((ctxt->mode != X86EMUL_MODE_REAL) && (desc.type & 8))
+ || !(desc.type & 2)) && write)
+ goto bad;
+ /* unreadable code segment */
+ if (!fetch && (desc.type & 8) && !(desc.type & 2))
+ goto bad;
+ lim = desc_limit_scaled(&desc);
+ if (!(desc.type & 8) && (desc.type & 4)) {
+ /* expand-down segment */
+ if (addr.ea <= lim)
+ goto bad;
+ lim = desc.d ? 0xffffffff : 0xffff;
+ }
+ if (addr.ea > lim)
+ goto bad;
+ if (lim == 0xffffffff)
+ *max_size = ~0u;
+ else {
+ *max_size = (u64)lim + 1 - addr.ea;
+ if (size > *max_size)
+ goto bad;
+ }
+ la &= (u32)-1;
+ break;
+ }
+ if (insn_aligned(ctxt, size) && ((la & (size - 1)) != 0))
+ return emulate_gp(ctxt, 0);
+ *linear = la;
+ return X86EMUL_CONTINUE;
+bad:
+ if (addr.seg == VCPU_SREG_SS)
+ return emulate_ss(ctxt, 0);
+ else
+ return emulate_gp(ctxt, 0);
+}
+
+static int linearize(struct x86_emulate_ctxt *ctxt,
+ struct segmented_address addr,
+ unsigned size, bool write,
+ ulong *linear)
+{
+ unsigned max_size;
+ return __linearize(ctxt, addr, &max_size, size, write, false,
+ ctxt->mode, linear);
+}
+
+static inline int assign_eip(struct x86_emulate_ctxt *ctxt, ulong dst,
+ enum x86emul_mode mode)
+{
+ ulong linear;
+ int rc;
+ unsigned max_size;
+ struct segmented_address addr = { .seg = VCPU_SREG_CS,
+ .ea = dst };
+
+ if (ctxt->op_bytes != sizeof(unsigned long))
+ addr.ea = dst & ((1UL << (ctxt->op_bytes << 3)) - 1);
+ rc = __linearize(ctxt, addr, &max_size, 1, false, true, mode, &linear);
+ if (rc == X86EMUL_CONTINUE)
+ ctxt->_eip = addr.ea;
+ return rc;
+}
+
+static inline int assign_eip_near(struct x86_emulate_ctxt *ctxt, ulong dst)
+{
+ return assign_eip(ctxt, dst, ctxt->mode);
+}
+
+static int assign_eip_far(struct x86_emulate_ctxt *ctxt, ulong dst,
+ const struct desc_struct *cs_desc)
+{
+ enum x86emul_mode mode = ctxt->mode;
+ int rc;
+
+#ifdef CONFIG_X86_64
+ if (ctxt->mode >= X86EMUL_MODE_PROT16) {
+ if (cs_desc->l) {
+ u64 efer = 0;
+
+ ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
+ if (efer & EFER_LMA)
+ mode = X86EMUL_MODE_PROT64;
+ } else
+ mode = X86EMUL_MODE_PROT32; /* temporary value */
+ }
+#endif
+ if (mode == X86EMUL_MODE_PROT16 || mode == X86EMUL_MODE_PROT32)
+ mode = cs_desc->d ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
+ rc = assign_eip(ctxt, dst, mode);
+ if (rc == X86EMUL_CONTINUE)
+ ctxt->mode = mode;
+ return rc;
+}
+
+static inline int jmp_rel(struct x86_emulate_ctxt *ctxt, int rel)
+{
+ return assign_eip_near(ctxt, ctxt->_eip + rel);
+}
+
+static int segmented_read_std(struct x86_emulate_ctxt *ctxt,
+ struct segmented_address addr,
+ void *data,
+ unsigned size)
+{
+ int rc;
+ ulong linear;
+
+ rc = linearize(ctxt, addr, size, false, &linear);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ return ctxt->ops->read_std(ctxt, linear, data, size, &ctxt->exception);
+}
+
+/*
+ * Prefetch the remaining bytes of the instruction without crossing page
+ * boundary if they are not in fetch_cache yet.
+ */
+static int __do_insn_fetch_bytes(struct x86_emulate_ctxt *ctxt, int op_size)
+{
+ int rc;
+ unsigned size, max_size;
+ unsigned long linear;
+ int cur_size = ctxt->fetch.end - ctxt->fetch.data;
+ struct segmented_address addr = { .seg = VCPU_SREG_CS,
+ .ea = ctxt->eip + cur_size };
+
+ /*
+ * We do not know exactly how many bytes will be needed, and
+ * __linearize is expensive, so fetch as much as possible. We
+ * just have to avoid going beyond the 15 byte limit, the end
+ * of the segment, or the end of the page.
+ *
+ * __linearize is called with size 0 so that it does not do any
+ * boundary check itself. Instead, we use max_size to check
+ * against op_size.
+ */
+ rc = __linearize(ctxt, addr, &max_size, 0, false, true, ctxt->mode,
+ &linear);
+ if (unlikely(rc != X86EMUL_CONTINUE))
+ return rc;
+
+ size = min_t(unsigned, 15UL ^ cur_size, max_size);
+ size = min_t(unsigned, size, PAGE_SIZE - offset_in_page(linear));
+
+ /*
+ * One instruction can only straddle two pages,
+ * and one has been loaded at the beginning of
+ * x86_decode_insn. So, if not enough bytes
+ * still, we must have hit the 15-byte boundary.
+ */
+ if (unlikely(size < op_size))
+ return emulate_gp(ctxt, 0);
+
+ rc = ctxt->ops->fetch(ctxt, linear, ctxt->fetch.end,
+ size, &ctxt->exception);
+ if (unlikely(rc != X86EMUL_CONTINUE))
+ return rc;
+ ctxt->fetch.end += size;
+ return X86EMUL_CONTINUE;
+}
+
+static __always_inline int do_insn_fetch_bytes(struct x86_emulate_ctxt *ctxt,
+ unsigned size)
+{
+ unsigned done_size = ctxt->fetch.end - ctxt->fetch.ptr;
+
+ if (unlikely(done_size < size))
+ return __do_insn_fetch_bytes(ctxt, size - done_size);
+ else
+ return X86EMUL_CONTINUE;
+}
+
+/* Fetch next part of the instruction being emulated. */
+#define insn_fetch(_type, _ctxt) \
+({ _type _x; \
+ \
+ rc = do_insn_fetch_bytes(_ctxt, sizeof(_type)); \
+ if (rc != X86EMUL_CONTINUE) \
+ goto done; \
+ ctxt->_eip += sizeof(_type); \
+ _x = *(_type __aligned(1) *) ctxt->fetch.ptr; \
+ ctxt->fetch.ptr += sizeof(_type); \
+ _x; \
+})
+
+#define insn_fetch_arr(_arr, _size, _ctxt) \
+({ \
+ rc = do_insn_fetch_bytes(_ctxt, _size); \
+ if (rc != X86EMUL_CONTINUE) \
+ goto done; \
+ ctxt->_eip += (_size); \
+ memcpy(_arr, ctxt->fetch.ptr, _size); \
+ ctxt->fetch.ptr += (_size); \
+})
+
+/*
+ * Given the 'reg' portion of a ModRM byte, and a register block, return a
+ * pointer into the block that addresses the relevant register.
+ * @highbyte_regs specifies whether to decode AH,CH,DH,BH.
+ */
+static void *decode_register(struct x86_emulate_ctxt *ctxt, u8 modrm_reg,
+ int byteop)
+{
+ void *p;
+ int highbyte_regs = (ctxt->rex_prefix == 0) && byteop;
+
+ if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8)
+ p = (unsigned char *)reg_rmw(ctxt, modrm_reg & 3) + 1;
+ else
+ p = reg_rmw(ctxt, modrm_reg);
+ return p;
+}
+
+static int read_descriptor(struct x86_emulate_ctxt *ctxt,
+ struct segmented_address addr,
+ u16 *size, unsigned long *address, int op_bytes)
+{
+ int rc;
+
+ if (op_bytes == 2)
+ op_bytes = 3;
+ *address = 0;
+ rc = segmented_read_std(ctxt, addr, size, 2);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ addr.ea += 2;
+ rc = segmented_read_std(ctxt, addr, address, op_bytes);
+ return rc;
+}
+
+FASTOP2(add);
+FASTOP2(or);
+FASTOP2(adc);
+FASTOP2(sbb);
+FASTOP2(and);
+FASTOP2(sub);
+FASTOP2(xor);
+FASTOP2(cmp);
+FASTOP2(test);
+
+FASTOP1SRC2(mul, mul_ex);
+FASTOP1SRC2(imul, imul_ex);
+FASTOP1SRC2EX(div, div_ex);
+FASTOP1SRC2EX(idiv, idiv_ex);
+
+FASTOP3WCL(shld);
+FASTOP3WCL(shrd);
+
+FASTOP2W(imul);
+
+FASTOP1(not);
+FASTOP1(neg);
+FASTOP1(inc);
+FASTOP1(dec);
+
+FASTOP2CL(rol);
+FASTOP2CL(ror);
+FASTOP2CL(rcl);
+FASTOP2CL(rcr);
+FASTOP2CL(shl);
+FASTOP2CL(shr);
+FASTOP2CL(sar);
+
+FASTOP2W(bsf);
+FASTOP2W(bsr);
+FASTOP2W(bt);
+FASTOP2W(bts);
+FASTOP2W(btr);
+FASTOP2W(btc);
+
+FASTOP2(xadd);
+
+FASTOP2R(cmp, cmp_r);
+
+static int em_bsf_c(struct x86_emulate_ctxt *ctxt)
+{
+ /* If src is zero, do not writeback, but update flags */
+ if (ctxt->src.val == 0)
+ ctxt->dst.type = OP_NONE;
+ return fastop(ctxt, em_bsf);
+}
+
+static int em_bsr_c(struct x86_emulate_ctxt *ctxt)
+{
+ /* If src is zero, do not writeback, but update flags */
+ if (ctxt->src.val == 0)
+ ctxt->dst.type = OP_NONE;
+ return fastop(ctxt, em_bsr);
+}
+
+static u8 test_cc(unsigned int condition, unsigned long flags)
+{
+ u8 rc;
+ void (*fop)(void) = (void *)em_setcc + 4 * (condition & 0xf);
+
+ flags = (flags & EFLAGS_MASK) | X86_EFLAGS_IF;
+ asm("push %[flags]; popf; call *%[fastop]"
+ : "=a"(rc) : [fastop]"r"(fop), [flags]"r"(flags));
+ return rc;
+}
+
+static void fetch_register_operand(struct operand *op)
+{
+ switch (op->bytes) {
+ case 1:
+ op->val = *(u8 *)op->addr.reg;
+ break;
+ case 2:
+ op->val = *(u16 *)op->addr.reg;
+ break;
+ case 4:
+ op->val = *(u32 *)op->addr.reg;
+ break;
+ case 8:
+ op->val = *(u64 *)op->addr.reg;
+ break;
+ }
+}
+
+static void read_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, int reg)
+{
+ ctxt->ops->get_fpu(ctxt);
+ switch (reg) {
+ case 0: asm("movdqa %%xmm0, %0" : "=m"(*data)); break;
+ case 1: asm("movdqa %%xmm1, %0" : "=m"(*data)); break;
+ case 2: asm("movdqa %%xmm2, %0" : "=m"(*data)); break;
+ case 3: asm("movdqa %%xmm3, %0" : "=m"(*data)); break;
+ case 4: asm("movdqa %%xmm4, %0" : "=m"(*data)); break;
+ case 5: asm("movdqa %%xmm5, %0" : "=m"(*data)); break;
+ case 6: asm("movdqa %%xmm6, %0" : "=m"(*data)); break;
+ case 7: asm("movdqa %%xmm7, %0" : "=m"(*data)); break;
+#ifdef CONFIG_X86_64
+ case 8: asm("movdqa %%xmm8, %0" : "=m"(*data)); break;
+ case 9: asm("movdqa %%xmm9, %0" : "=m"(*data)); break;
+ case 10: asm("movdqa %%xmm10, %0" : "=m"(*data)); break;
+ case 11: asm("movdqa %%xmm11, %0" : "=m"(*data)); break;
+ case 12: asm("movdqa %%xmm12, %0" : "=m"(*data)); break;
+ case 13: asm("movdqa %%xmm13, %0" : "=m"(*data)); break;
+ case 14: asm("movdqa %%xmm14, %0" : "=m"(*data)); break;
+ case 15: asm("movdqa %%xmm15, %0" : "=m"(*data)); break;
+#endif
+ default: BUG();
+ }
+ ctxt->ops->put_fpu(ctxt);
+}
+
+static void write_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data,
+ int reg)
+{
+ ctxt->ops->get_fpu(ctxt);
+ switch (reg) {
+ case 0: asm("movdqa %0, %%xmm0" : : "m"(*data)); break;
+ case 1: asm("movdqa %0, %%xmm1" : : "m"(*data)); break;
+ case 2: asm("movdqa %0, %%xmm2" : : "m"(*data)); break;
+ case 3: asm("movdqa %0, %%xmm3" : : "m"(*data)); break;
+ case 4: asm("movdqa %0, %%xmm4" : : "m"(*data)); break;
+ case 5: asm("movdqa %0, %%xmm5" : : "m"(*data)); break;
+ case 6: asm("movdqa %0, %%xmm6" : : "m"(*data)); break;
+ case 7: asm("movdqa %0, %%xmm7" : : "m"(*data)); break;
+#ifdef CONFIG_X86_64
+ case 8: asm("movdqa %0, %%xmm8" : : "m"(*data)); break;
+ case 9: asm("movdqa %0, %%xmm9" : : "m"(*data)); break;
+ case 10: asm("movdqa %0, %%xmm10" : : "m"(*data)); break;
+ case 11: asm("movdqa %0, %%xmm11" : : "m"(*data)); break;
+ case 12: asm("movdqa %0, %%xmm12" : : "m"(*data)); break;
+ case 13: asm("movdqa %0, %%xmm13" : : "m"(*data)); break;
+ case 14: asm("movdqa %0, %%xmm14" : : "m"(*data)); break;
+ case 15: asm("movdqa %0, %%xmm15" : : "m"(*data)); break;
+#endif
+ default: BUG();
+ }
+ ctxt->ops->put_fpu(ctxt);
+}
+
+static void read_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg)
+{
+ ctxt->ops->get_fpu(ctxt);
+ switch (reg) {
+ case 0: asm("movq %%mm0, %0" : "=m"(*data)); break;
+ case 1: asm("movq %%mm1, %0" : "=m"(*data)); break;
+ case 2: asm("movq %%mm2, %0" : "=m"(*data)); break;
+ case 3: asm("movq %%mm3, %0" : "=m"(*data)); break;
+ case 4: asm("movq %%mm4, %0" : "=m"(*data)); break;
+ case 5: asm("movq %%mm5, %0" : "=m"(*data)); break;
+ case 6: asm("movq %%mm6, %0" : "=m"(*data)); break;
+ case 7: asm("movq %%mm7, %0" : "=m"(*data)); break;
+ default: BUG();
+ }
+ ctxt->ops->put_fpu(ctxt);
+}
+
+static void write_mmx_reg(struct x86_emulate_ctxt *ctxt, u64 *data, int reg)
+{
+ ctxt->ops->get_fpu(ctxt);
+ switch (reg) {
+ case 0: asm("movq %0, %%mm0" : : "m"(*data)); break;
+ case 1: asm("movq %0, %%mm1" : : "m"(*data)); break;
+ case 2: asm("movq %0, %%mm2" : : "m"(*data)); break;
+ case 3: asm("movq %0, %%mm3" : : "m"(*data)); break;
+ case 4: asm("movq %0, %%mm4" : : "m"(*data)); break;
+ case 5: asm("movq %0, %%mm5" : : "m"(*data)); break;
+ case 6: asm("movq %0, %%mm6" : : "m"(*data)); break;
+ case 7: asm("movq %0, %%mm7" : : "m"(*data)); break;
+ default: BUG();
+ }
+ ctxt->ops->put_fpu(ctxt);
+}
+
+static int em_fninit(struct x86_emulate_ctxt *ctxt)
+{
+ if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
+ return emulate_nm(ctxt);
+
+ ctxt->ops->get_fpu(ctxt);
+ asm volatile("fninit");
+ ctxt->ops->put_fpu(ctxt);
+ return X86EMUL_CONTINUE;
+}
+
+static int em_fnstcw(struct x86_emulate_ctxt *ctxt)
+{
+ u16 fcw;
+
+ if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
+ return emulate_nm(ctxt);
+
+ ctxt->ops->get_fpu(ctxt);
+ asm volatile("fnstcw %0": "+m"(fcw));
+ ctxt->ops->put_fpu(ctxt);
+
+ ctxt->dst.val = fcw;
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_fnstsw(struct x86_emulate_ctxt *ctxt)
+{
+ u16 fsw;
+
+ if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
+ return emulate_nm(ctxt);
+
+ ctxt->ops->get_fpu(ctxt);
+ asm volatile("fnstsw %0": "+m"(fsw));
+ ctxt->ops->put_fpu(ctxt);
+
+ ctxt->dst.val = fsw;
+
+ return X86EMUL_CONTINUE;
+}
+
+static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
+ struct operand *op)
+{
+ unsigned reg = ctxt->modrm_reg;
+
+ if (!(ctxt->d & ModRM))
+ reg = (ctxt->b & 7) | ((ctxt->rex_prefix & 1) << 3);
+
+ if (ctxt->d & Sse) {
+ op->type = OP_XMM;
+ op->bytes = 16;
+ op->addr.xmm = reg;
+ read_sse_reg(ctxt, &op->vec_val, reg);
+ return;
+ }
+ if (ctxt->d & Mmx) {
+ reg &= 7;
+ op->type = OP_MM;
+ op->bytes = 8;
+ op->addr.mm = reg;
+ return;
+ }
+
+ op->type = OP_REG;
+ op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
+ op->addr.reg = decode_register(ctxt, reg, ctxt->d & ByteOp);
+
+ fetch_register_operand(op);
+ op->orig_val = op->val;
+}
+
+static void adjust_modrm_seg(struct x86_emulate_ctxt *ctxt, int base_reg)
+{
+ if (base_reg == VCPU_REGS_RSP || base_reg == VCPU_REGS_RBP)
+ ctxt->modrm_seg = VCPU_SREG_SS;
+}
+
+static int decode_modrm(struct x86_emulate_ctxt *ctxt,
+ struct operand *op)
+{
+ u8 sib;
+ int index_reg, base_reg, scale;
+ int rc = X86EMUL_CONTINUE;
+ ulong modrm_ea = 0;
+
+ ctxt->modrm_reg = ((ctxt->rex_prefix << 1) & 8); /* REX.R */
+ index_reg = (ctxt->rex_prefix << 2) & 8; /* REX.X */
+ base_reg = (ctxt->rex_prefix << 3) & 8; /* REX.B */
+
+ ctxt->modrm_mod = (ctxt->modrm & 0xc0) >> 6;
+ ctxt->modrm_reg |= (ctxt->modrm & 0x38) >> 3;
+ ctxt->modrm_rm = base_reg | (ctxt->modrm & 0x07);
+ ctxt->modrm_seg = VCPU_SREG_DS;
+
+ if (ctxt->modrm_mod == 3 || (ctxt->d & NoMod)) {
+ op->type = OP_REG;
+ op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
+ op->addr.reg = decode_register(ctxt, ctxt->modrm_rm,
+ ctxt->d & ByteOp);
+ if (ctxt->d & Sse) {
+ op->type = OP_XMM;
+ op->bytes = 16;
+ op->addr.xmm = ctxt->modrm_rm;
+ read_sse_reg(ctxt, &op->vec_val, ctxt->modrm_rm);
+ return rc;
+ }
+ if (ctxt->d & Mmx) {
+ op->type = OP_MM;
+ op->bytes = 8;
+ op->addr.mm = ctxt->modrm_rm & 7;
+ return rc;
+ }
+ fetch_register_operand(op);
+ return rc;
+ }
+
+ op->type = OP_MEM;
+
+ if (ctxt->ad_bytes == 2) {
+ unsigned bx = reg_read(ctxt, VCPU_REGS_RBX);
+ unsigned bp = reg_read(ctxt, VCPU_REGS_RBP);
+ unsigned si = reg_read(ctxt, VCPU_REGS_RSI);
+ unsigned di = reg_read(ctxt, VCPU_REGS_RDI);
+
+ /* 16-bit ModR/M decode. */
+ switch (ctxt->modrm_mod) {
+ case 0:
+ if (ctxt->modrm_rm == 6)
+ modrm_ea += insn_fetch(u16, ctxt);
+ break;
+ case 1:
+ modrm_ea += insn_fetch(s8, ctxt);
+ break;
+ case 2:
+ modrm_ea += insn_fetch(u16, ctxt);
+ break;
+ }
+ switch (ctxt->modrm_rm) {
+ case 0:
+ modrm_ea += bx + si;
+ break;
+ case 1:
+ modrm_ea += bx + di;
+ break;
+ case 2:
+ modrm_ea += bp + si;
+ break;
+ case 3:
+ modrm_ea += bp + di;
+ break;
+ case 4:
+ modrm_ea += si;
+ break;
+ case 5:
+ modrm_ea += di;
+ break;
+ case 6:
+ if (ctxt->modrm_mod != 0)
+ modrm_ea += bp;
+ break;
+ case 7:
+ modrm_ea += bx;
+ break;
+ }
+ if (ctxt->modrm_rm == 2 || ctxt->modrm_rm == 3 ||
+ (ctxt->modrm_rm == 6 && ctxt->modrm_mod != 0))
+ ctxt->modrm_seg = VCPU_SREG_SS;
+ modrm_ea = (u16)modrm_ea;
+ } else {
+ /* 32/64-bit ModR/M decode. */
+ if ((ctxt->modrm_rm & 7) == 4) {
+ sib = insn_fetch(u8, ctxt);
+ index_reg |= (sib >> 3) & 7;
+ base_reg |= sib & 7;
+ scale = sib >> 6;
+
+ if ((base_reg & 7) == 5 && ctxt->modrm_mod == 0)
+ modrm_ea += insn_fetch(s32, ctxt);
+ else {
+ modrm_ea += reg_read(ctxt, base_reg);
+ adjust_modrm_seg(ctxt, base_reg);
+ /* Increment ESP on POP [ESP] */
+ if ((ctxt->d & IncSP) &&
+ base_reg == VCPU_REGS_RSP)
+ modrm_ea += ctxt->op_bytes;
+ }
+ if (index_reg != 4)
+ modrm_ea += reg_read(ctxt, index_reg) << scale;
+ } else if ((ctxt->modrm_rm & 7) == 5 && ctxt->modrm_mod == 0) {
+ modrm_ea += insn_fetch(s32, ctxt);
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ ctxt->rip_relative = 1;
+ } else {
+ base_reg = ctxt->modrm_rm;
+ modrm_ea += reg_read(ctxt, base_reg);
+ adjust_modrm_seg(ctxt, base_reg);
+ }
+ switch (ctxt->modrm_mod) {
+ case 1:
+ modrm_ea += insn_fetch(s8, ctxt);
+ break;
+ case 2:
+ modrm_ea += insn_fetch(s32, ctxt);
+ break;
+ }
+ }
+ op->addr.mem.ea = modrm_ea;
+ if (ctxt->ad_bytes != 8)
+ ctxt->memop.addr.mem.ea = (u32)ctxt->memop.addr.mem.ea;
+
+done:
+ return rc;
+}
+
+static int decode_abs(struct x86_emulate_ctxt *ctxt,
+ struct operand *op)
+{
+ int rc = X86EMUL_CONTINUE;
+
+ op->type = OP_MEM;
+ switch (ctxt->ad_bytes) {
+ case 2:
+ op->addr.mem.ea = insn_fetch(u16, ctxt);
+ break;
+ case 4:
+ op->addr.mem.ea = insn_fetch(u32, ctxt);
+ break;
+ case 8:
+ op->addr.mem.ea = insn_fetch(u64, ctxt);
+ break;
+ }
+done:
+ return rc;
+}
+
+static void fetch_bit_operand(struct x86_emulate_ctxt *ctxt)
+{
+ long sv = 0, mask;
+
+ if (ctxt->dst.type == OP_MEM && ctxt->src.type == OP_REG) {
+ mask = ~((long)ctxt->dst.bytes * 8 - 1);
+
+ if (ctxt->src.bytes == 2)
+ sv = (s16)ctxt->src.val & (s16)mask;
+ else if (ctxt->src.bytes == 4)
+ sv = (s32)ctxt->src.val & (s32)mask;
+ else
+ sv = (s64)ctxt->src.val & (s64)mask;
+
+ ctxt->dst.addr.mem.ea = address_mask(ctxt,
+ ctxt->dst.addr.mem.ea + (sv >> 3));
+ }
+
+ /* only subword offset */
+ ctxt->src.val &= (ctxt->dst.bytes << 3) - 1;
+}
+
+static int read_emulated(struct x86_emulate_ctxt *ctxt,
+ unsigned long addr, void *dest, unsigned size)
+{
+ int rc;
+ struct read_cache *mc = &ctxt->mem_read;
+
+ if (mc->pos < mc->end)
+ goto read_cached;
+
+ WARN_ON((mc->end + size) >= sizeof(mc->data));
+
+ rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, size,
+ &ctxt->exception);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ mc->end += size;
+
+read_cached:
+ memcpy(dest, mc->data + mc->pos, size);
+ mc->pos += size;
+ return X86EMUL_CONTINUE;
+}
+
+static int segmented_read(struct x86_emulate_ctxt *ctxt,
+ struct segmented_address addr,
+ void *data,
+ unsigned size)
+{
+ int rc;
+ ulong linear;
+
+ rc = linearize(ctxt, addr, size, false, &linear);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ return read_emulated(ctxt, linear, data, size);
+}
+
+static int segmented_write(struct x86_emulate_ctxt *ctxt,
+ struct segmented_address addr,
+ const void *data,
+ unsigned size)
+{
+ int rc;
+ ulong linear;
+
+ rc = linearize(ctxt, addr, size, true, &linear);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ return ctxt->ops->write_emulated(ctxt, linear, data, size,
+ &ctxt->exception);
+}
+
+static int segmented_cmpxchg(struct x86_emulate_ctxt *ctxt,
+ struct segmented_address addr,
+ const void *orig_data, const void *data,
+ unsigned size)
+{
+ int rc;
+ ulong linear;
+
+ rc = linearize(ctxt, addr, size, true, &linear);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ return ctxt->ops->cmpxchg_emulated(ctxt, linear, orig_data, data,
+ size, &ctxt->exception);
+}
+
+static int pio_in_emulated(struct x86_emulate_ctxt *ctxt,
+ unsigned int size, unsigned short port,
+ void *dest)
+{
+ struct read_cache *rc = &ctxt->io_read;
+
+ if (rc->pos == rc->end) { /* refill pio read ahead */
+ unsigned int in_page, n;
+ unsigned int count = ctxt->rep_prefix ?
+ address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) : 1;
+ in_page = (ctxt->eflags & X86_EFLAGS_DF) ?
+ offset_in_page(reg_read(ctxt, VCPU_REGS_RDI)) :
+ PAGE_SIZE - offset_in_page(reg_read(ctxt, VCPU_REGS_RDI));
+ n = min3(in_page, (unsigned int)sizeof(rc->data) / size, count);
+ if (n == 0)
+ n = 1;
+ rc->pos = rc->end = 0;
+ if (!ctxt->ops->pio_in_emulated(ctxt, size, port, rc->data, n))
+ return 0;
+ rc->end = n * size;
+ }
+
+ if (ctxt->rep_prefix && (ctxt->d & String) &&
+ !(ctxt->eflags & X86_EFLAGS_DF)) {
+ ctxt->dst.data = rc->data + rc->pos;
+ ctxt->dst.type = OP_MEM_STR;
+ ctxt->dst.count = (rc->end - rc->pos) / size;
+ rc->pos = rc->end;
+ } else {
+ memcpy(dest, rc->data + rc->pos, size);
+ rc->pos += size;
+ }
+ return 1;
+}
+
+static int read_interrupt_descriptor(struct x86_emulate_ctxt *ctxt,
+ u16 index, struct desc_struct *desc)
+{
+ struct desc_ptr dt;
+ ulong addr;
+
+ ctxt->ops->get_idt(ctxt, &dt);
+
+ if (dt.size < index * 8 + 7)
+ return emulate_gp(ctxt, index << 3 | 0x2);
+
+ addr = dt.address + index * 8;
+ return ctxt->ops->read_std(ctxt, addr, desc, sizeof *desc,
+ &ctxt->exception);
+}
+
+static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt,
+ u16 selector, struct desc_ptr *dt)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ u32 base3 = 0;
+
+ if (selector & 1 << 2) {
+ struct desc_struct desc;
+ u16 sel;
+
+ memset (dt, 0, sizeof *dt);
+ if (!ops->get_segment(ctxt, &sel, &desc, &base3,
+ VCPU_SREG_LDTR))
+ return;
+
+ dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */
+ dt->address = get_desc_base(&desc) | ((u64)base3 << 32);
+ } else
+ ops->get_gdt(ctxt, dt);
+}
+
+static int get_descriptor_ptr(struct x86_emulate_ctxt *ctxt,
+ u16 selector, ulong *desc_addr_p)
+{
+ struct desc_ptr dt;
+ u16 index = selector >> 3;
+ ulong addr;
+
+ get_descriptor_table_ptr(ctxt, selector, &dt);
+
+ if (dt.size < index * 8 + 7)
+ return emulate_gp(ctxt, selector & 0xfffc);
+
+ addr = dt.address + index * 8;
+
+#ifdef CONFIG_X86_64
+ if (addr >> 32 != 0) {
+ u64 efer = 0;
+
+ ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
+ if (!(efer & EFER_LMA))
+ addr &= (u32)-1;
+ }
+#endif
+
+ *desc_addr_p = addr;
+ return X86EMUL_CONTINUE;
+}
+
+/* allowed just for 8 bytes segments */
+static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt,
+ u16 selector, struct desc_struct *desc,
+ ulong *desc_addr_p)
+{
+ int rc;
+
+ rc = get_descriptor_ptr(ctxt, selector, desc_addr_p);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ return ctxt->ops->read_std(ctxt, *desc_addr_p, desc, sizeof(*desc),
+ &ctxt->exception);
+}
+
+/* allowed just for 8 bytes segments */
+static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt,
+ u16 selector, struct desc_struct *desc)
+{
+ int rc;
+ ulong addr;
+
+ rc = get_descriptor_ptr(ctxt, selector, &addr);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ return ctxt->ops->write_std(ctxt, addr, desc, sizeof *desc,
+ &ctxt->exception);
+}
+
+/* Does not support long mode */
+static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
+ u16 selector, int seg, u8 cpl,
+ enum x86_transfer_type transfer,
+ struct desc_struct *desc)
+{
+ struct desc_struct seg_desc, old_desc;
+ u8 dpl, rpl;
+ unsigned err_vec = GP_VECTOR;
+ u32 err_code = 0;
+ bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */
+ ulong desc_addr;
+ int ret;
+ u16 dummy;
+ u32 base3 = 0;
+
+ memset(&seg_desc, 0, sizeof seg_desc);
+
+ if (ctxt->mode == X86EMUL_MODE_REAL) {
+ /* set real mode segment descriptor (keep limit etc. for
+ * unreal mode) */
+ ctxt->ops->get_segment(ctxt, &dummy, &seg_desc, NULL, seg);
+ set_desc_base(&seg_desc, selector << 4);
+ goto load;
+ } else if (seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86) {
+ /* VM86 needs a clean new segment descriptor */
+ set_desc_base(&seg_desc, selector << 4);
+ set_desc_limit(&seg_desc, 0xffff);
+ seg_desc.type = 3;
+ seg_desc.p = 1;
+ seg_desc.s = 1;
+ seg_desc.dpl = 3;
+ goto load;
+ }
+
+ rpl = selector & 3;
+
+ /* NULL selector is not valid for TR, CS and SS (except for long mode) */
+ if ((seg == VCPU_SREG_CS
+ || (seg == VCPU_SREG_SS
+ && (ctxt->mode != X86EMUL_MODE_PROT64 || rpl != cpl))
+ || seg == VCPU_SREG_TR)
+ && null_selector)
+ goto exception;
+
+ /* TR should be in GDT only */
+ if (seg == VCPU_SREG_TR && (selector & (1 << 2)))
+ goto exception;
+
+ if (null_selector) /* for NULL selector skip all following checks */
+ goto load;
+
+ ret = read_segment_descriptor(ctxt, selector, &seg_desc, &desc_addr);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ err_code = selector & 0xfffc;
+ err_vec = (transfer == X86_TRANSFER_TASK_SWITCH) ? TS_VECTOR :
+ GP_VECTOR;
+
+ /* can't load system descriptor into segment selector */
+ if (seg <= VCPU_SREG_GS && !seg_desc.s) {
+ if (transfer == X86_TRANSFER_CALL_JMP)
+ return X86EMUL_UNHANDLEABLE;
+ goto exception;
+ }
+
+ if (!seg_desc.p) {
+ err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR;
+ goto exception;
+ }
+
+ dpl = seg_desc.dpl;
+
+ switch (seg) {
+ case VCPU_SREG_SS:
+ /*
+ * segment is not a writable data segment or segment
+ * selector's RPL != CPL or segment selector's RPL != CPL
+ */
+ if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl)
+ goto exception;
+ break;
+ case VCPU_SREG_CS:
+ if (!(seg_desc.type & 8))
+ goto exception;
+
+ if (seg_desc.type & 4) {
+ /* conforming */
+ if (dpl > cpl)
+ goto exception;
+ } else {
+ /* nonconforming */
+ if (rpl > cpl || dpl != cpl)
+ goto exception;
+ }
+ /* in long-mode d/b must be clear if l is set */
+ if (seg_desc.d && seg_desc.l) {
+ u64 efer = 0;
+
+ ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
+ if (efer & EFER_LMA)
+ goto exception;
+ }
+
+ /* CS(RPL) <- CPL */
+ selector = (selector & 0xfffc) | cpl;
+ break;
+ case VCPU_SREG_TR:
+ if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9))
+ goto exception;
+ old_desc = seg_desc;
+ seg_desc.type |= 2; /* busy */
+ ret = ctxt->ops->cmpxchg_emulated(ctxt, desc_addr, &old_desc, &seg_desc,
+ sizeof(seg_desc), &ctxt->exception);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ break;
+ case VCPU_SREG_LDTR:
+ if (seg_desc.s || seg_desc.type != 2)
+ goto exception;
+ break;
+ default: /* DS, ES, FS, or GS */
+ /*
+ * segment is not a data or readable code segment or
+ * ((segment is a data or nonconforming code segment)
+ * and (both RPL and CPL > DPL))
+ */
+ if ((seg_desc.type & 0xa) == 0x8 ||
+ (((seg_desc.type & 0xc) != 0xc) &&
+ (rpl > dpl && cpl > dpl)))
+ goto exception;
+ break;
+ }
+
+ if (seg_desc.s) {
+ /* mark segment as accessed */
+ if (!(seg_desc.type & 1)) {
+ seg_desc.type |= 1;
+ ret = write_segment_descriptor(ctxt, selector,
+ &seg_desc);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ }
+ } else if (ctxt->mode == X86EMUL_MODE_PROT64) {
+ ret = ctxt->ops->read_std(ctxt, desc_addr+8, &base3,
+ sizeof(base3), &ctxt->exception);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ if (is_noncanonical_address(get_desc_base(&seg_desc) |
+ ((u64)base3 << 32)))
+ return emulate_gp(ctxt, 0);
+ }
+load:
+ ctxt->ops->set_segment(ctxt, selector, &seg_desc, base3, seg);
+ if (desc)
+ *desc = seg_desc;
+ return X86EMUL_CONTINUE;
+exception:
+ return emulate_exception(ctxt, err_vec, err_code, true);
+}
+
+static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
+ u16 selector, int seg)
+{
+ u8 cpl = ctxt->ops->cpl(ctxt);
+ return __load_segment_descriptor(ctxt, selector, seg, cpl,
+ X86_TRANSFER_NONE, NULL);
+}
+
+static void write_register_operand(struct operand *op)
+{
+ return assign_register(op->addr.reg, op->val, op->bytes);
+}
+
+static int writeback(struct x86_emulate_ctxt *ctxt, struct operand *op)
+{
+ switch (op->type) {
+ case OP_REG:
+ write_register_operand(op);
+ break;
+ case OP_MEM:
+ if (ctxt->lock_prefix)
+ return segmented_cmpxchg(ctxt,
+ op->addr.mem,
+ &op->orig_val,
+ &op->val,
+ op->bytes);
+ else
+ return segmented_write(ctxt,
+ op->addr.mem,
+ &op->val,
+ op->bytes);
+ break;
+ case OP_MEM_STR:
+ return segmented_write(ctxt,
+ op->addr.mem,
+ op->data,
+ op->bytes * op->count);
+ break;
+ case OP_XMM:
+ write_sse_reg(ctxt, &op->vec_val, op->addr.xmm);
+ break;
+ case OP_MM:
+ write_mmx_reg(ctxt, &op->mm_val, op->addr.mm);
+ break;
+ case OP_NONE:
+ /* no writeback */
+ break;
+ default:
+ break;
+ }
+ return X86EMUL_CONTINUE;
+}
+
+static int push(struct x86_emulate_ctxt *ctxt, void *data, int bytes)
+{
+ struct segmented_address addr;
+
+ rsp_increment(ctxt, -bytes);
+ addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt);
+ addr.seg = VCPU_SREG_SS;
+
+ return segmented_write(ctxt, addr, data, bytes);
+}
+
+static int em_push(struct x86_emulate_ctxt *ctxt)
+{
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return push(ctxt, &ctxt->src.val, ctxt->op_bytes);
+}
+
+static int emulate_pop(struct x86_emulate_ctxt *ctxt,
+ void *dest, int len)
+{
+ int rc;
+ struct segmented_address addr;
+
+ addr.ea = reg_read(ctxt, VCPU_REGS_RSP) & stack_mask(ctxt);
+ addr.seg = VCPU_SREG_SS;
+ rc = segmented_read(ctxt, addr, dest, len);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rsp_increment(ctxt, len);
+ return rc;
+}
+
+static int em_pop(struct x86_emulate_ctxt *ctxt)
+{
+ return emulate_pop(ctxt, &ctxt->dst.val, ctxt->op_bytes);
+}
+
+static int emulate_popf(struct x86_emulate_ctxt *ctxt,
+ void *dest, int len)
+{
+ int rc;
+ unsigned long val, change_mask;
+ int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> X86_EFLAGS_IOPL_BIT;
+ int cpl = ctxt->ops->cpl(ctxt);
+
+ rc = emulate_pop(ctxt, &val, len);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ change_mask = X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
+ X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF |
+ X86_EFLAGS_TF | X86_EFLAGS_DF | X86_EFLAGS_NT |
+ X86_EFLAGS_AC | X86_EFLAGS_ID;
+
+ switch(ctxt->mode) {
+ case X86EMUL_MODE_PROT64:
+ case X86EMUL_MODE_PROT32:
+ case X86EMUL_MODE_PROT16:
+ if (cpl == 0)
+ change_mask |= X86_EFLAGS_IOPL;
+ if (cpl <= iopl)
+ change_mask |= X86_EFLAGS_IF;
+ break;
+ case X86EMUL_MODE_VM86:
+ if (iopl < 3)
+ return emulate_gp(ctxt, 0);
+ change_mask |= X86_EFLAGS_IF;
+ break;
+ default: /* real mode */
+ change_mask |= (X86_EFLAGS_IOPL | X86_EFLAGS_IF);
+ break;
+ }
+
+ *(unsigned long *)dest =
+ (ctxt->eflags & ~change_mask) | (val & change_mask);
+
+ return rc;
+}
+
+static int em_popf(struct x86_emulate_ctxt *ctxt)
+{
+ ctxt->dst.type = OP_REG;
+ ctxt->dst.addr.reg = &ctxt->eflags;
+ ctxt->dst.bytes = ctxt->op_bytes;
+ return emulate_popf(ctxt, &ctxt->dst.val, ctxt->op_bytes);
+}
+
+static int em_enter(struct x86_emulate_ctxt *ctxt)
+{
+ int rc;
+ unsigned frame_size = ctxt->src.val;
+ unsigned nesting_level = ctxt->src2.val & 31;
+ ulong rbp;
+
+ if (nesting_level)
+ return X86EMUL_UNHANDLEABLE;
+
+ rbp = reg_read(ctxt, VCPU_REGS_RBP);
+ rc = push(ctxt, &rbp, stack_size(ctxt));
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ assign_masked(reg_rmw(ctxt, VCPU_REGS_RBP), reg_read(ctxt, VCPU_REGS_RSP),
+ stack_mask(ctxt));
+ assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP),
+ reg_read(ctxt, VCPU_REGS_RSP) - frame_size,
+ stack_mask(ctxt));
+ return X86EMUL_CONTINUE;
+}
+
+static int em_leave(struct x86_emulate_ctxt *ctxt)
+{
+ assign_masked(reg_rmw(ctxt, VCPU_REGS_RSP), reg_read(ctxt, VCPU_REGS_RBP),
+ stack_mask(ctxt));
+ return emulate_pop(ctxt, reg_rmw(ctxt, VCPU_REGS_RBP), ctxt->op_bytes);
+}
+
+static int em_push_sreg(struct x86_emulate_ctxt *ctxt)
+{
+ int seg = ctxt->src2.val;
+
+ ctxt->src.val = get_segment_selector(ctxt, seg);
+ if (ctxt->op_bytes == 4) {
+ rsp_increment(ctxt, -2);
+ ctxt->op_bytes = 2;
+ }
+
+ return em_push(ctxt);
+}
+
+static int em_pop_sreg(struct x86_emulate_ctxt *ctxt)
+{
+ int seg = ctxt->src2.val;
+ unsigned long selector;
+ int rc;
+
+ rc = emulate_pop(ctxt, &selector, 2);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ if (ctxt->modrm_reg == VCPU_SREG_SS)
+ ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
+ if (ctxt->op_bytes > 2)
+ rsp_increment(ctxt, ctxt->op_bytes - 2);
+
+ rc = load_segment_descriptor(ctxt, (u16)selector, seg);
+ return rc;
+}
+
+static int em_pusha(struct x86_emulate_ctxt *ctxt)
+{
+ unsigned long old_esp = reg_read(ctxt, VCPU_REGS_RSP);
+ int rc = X86EMUL_CONTINUE;
+ int reg = VCPU_REGS_RAX;
+
+ while (reg <= VCPU_REGS_RDI) {
+ (reg == VCPU_REGS_RSP) ?
+ (ctxt->src.val = old_esp) : (ctxt->src.val = reg_read(ctxt, reg));
+
+ rc = em_push(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ ++reg;
+ }
+
+ return rc;
+}
+
+static int em_pushf(struct x86_emulate_ctxt *ctxt)
+{
+ ctxt->src.val = (unsigned long)ctxt->eflags & ~X86_EFLAGS_VM;
+ return em_push(ctxt);
+}
+
+static int em_popa(struct x86_emulate_ctxt *ctxt)
+{
+ int rc = X86EMUL_CONTINUE;
+ int reg = VCPU_REGS_RDI;
+ u32 val;
+
+ while (reg >= VCPU_REGS_RAX) {
+ if (reg == VCPU_REGS_RSP) {
+ rsp_increment(ctxt, ctxt->op_bytes);
+ --reg;
+ }
+
+ rc = emulate_pop(ctxt, &val, ctxt->op_bytes);
+ if (rc != X86EMUL_CONTINUE)
+ break;
+ assign_register(reg_rmw(ctxt, reg), val, ctxt->op_bytes);
+ --reg;
+ }
+ return rc;
+}
+
+static int __emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ int rc;
+ struct desc_ptr dt;
+ gva_t cs_addr;
+ gva_t eip_addr;
+ u16 cs, eip;
+
+ /* TODO: Add limit checks */
+ ctxt->src.val = ctxt->eflags;
+ rc = em_push(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ ctxt->eflags &= ~(X86_EFLAGS_IF | X86_EFLAGS_TF | X86_EFLAGS_AC);
+
+ ctxt->src.val = get_segment_selector(ctxt, VCPU_SREG_CS);
+ rc = em_push(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ ctxt->src.val = ctxt->_eip;
+ rc = em_push(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ ops->get_idt(ctxt, &dt);
+
+ eip_addr = dt.address + (irq << 2);
+ cs_addr = dt.address + (irq << 2) + 2;
+
+ rc = ops->read_std(ctxt, cs_addr, &cs, 2, &ctxt->exception);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = ops->read_std(ctxt, eip_addr, &eip, 2, &ctxt->exception);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = load_segment_descriptor(ctxt, cs, VCPU_SREG_CS);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ ctxt->_eip = eip;
+
+ return rc;
+}
+
+int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq)
+{
+ int rc;
+
+ invalidate_registers(ctxt);
+ rc = __emulate_int_real(ctxt, irq);
+ if (rc == X86EMUL_CONTINUE)
+ writeback_registers(ctxt);
+ return rc;
+}
+
+static int emulate_int(struct x86_emulate_ctxt *ctxt, int irq)
+{
+ switch(ctxt->mode) {
+ case X86EMUL_MODE_REAL:
+ return __emulate_int_real(ctxt, irq);
+ case X86EMUL_MODE_VM86:
+ case X86EMUL_MODE_PROT16:
+ case X86EMUL_MODE_PROT32:
+ case X86EMUL_MODE_PROT64:
+ default:
+ /* Protected mode interrupts unimplemented yet */
+ return X86EMUL_UNHANDLEABLE;
+ }
+}
+
+static int emulate_iret_real(struct x86_emulate_ctxt *ctxt)
+{
+ int rc = X86EMUL_CONTINUE;
+ unsigned long temp_eip = 0;
+ unsigned long temp_eflags = 0;
+ unsigned long cs = 0;
+ unsigned long mask = X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
+ X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_TF |
+ X86_EFLAGS_IF | X86_EFLAGS_DF | X86_EFLAGS_OF |
+ X86_EFLAGS_IOPL | X86_EFLAGS_NT | X86_EFLAGS_RF |
+ X86_EFLAGS_AC | X86_EFLAGS_ID |
+ X86_EFLAGS_FIXED;
+ unsigned long vm86_mask = X86_EFLAGS_VM | X86_EFLAGS_VIF |
+ X86_EFLAGS_VIP;
+
+ /* TODO: Add stack limit check */
+
+ rc = emulate_pop(ctxt, &temp_eip, ctxt->op_bytes);
+
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ if (temp_eip & ~0xffff)
+ return emulate_gp(ctxt, 0);
+
+ rc = emulate_pop(ctxt, &cs, ctxt->op_bytes);
+
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = emulate_pop(ctxt, &temp_eflags, ctxt->op_bytes);
+
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS);
+
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ ctxt->_eip = temp_eip;
+
+ if (ctxt->op_bytes == 4)
+ ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask));
+ else if (ctxt->op_bytes == 2) {
+ ctxt->eflags &= ~0xffff;
+ ctxt->eflags |= temp_eflags;
+ }
+
+ ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */
+ ctxt->eflags |= X86_EFLAGS_FIXED;
+ ctxt->ops->set_nmi_mask(ctxt, false);
+
+ return rc;
+}
+
+static int em_iret(struct x86_emulate_ctxt *ctxt)
+{
+ switch(ctxt->mode) {
+ case X86EMUL_MODE_REAL:
+ return emulate_iret_real(ctxt);
+ case X86EMUL_MODE_VM86:
+ case X86EMUL_MODE_PROT16:
+ case X86EMUL_MODE_PROT32:
+ case X86EMUL_MODE_PROT64:
+ default:
+ /* iret from protected mode unimplemented yet */
+ return X86EMUL_UNHANDLEABLE;
+ }
+}
+
+static int em_jmp_far(struct x86_emulate_ctxt *ctxt)
+{
+ int rc;
+ unsigned short sel, old_sel;
+ struct desc_struct old_desc, new_desc;
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ u8 cpl = ctxt->ops->cpl(ctxt);
+
+ /* Assignment of RIP may only fail in 64-bit mode */
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ ops->get_segment(ctxt, &old_sel, &old_desc, NULL,
+ VCPU_SREG_CS);
+
+ memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
+
+ rc = __load_segment_descriptor(ctxt, sel, VCPU_SREG_CS, cpl,
+ X86_TRANSFER_CALL_JMP,
+ &new_desc);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc);
+ if (rc != X86EMUL_CONTINUE) {
+ WARN_ON(ctxt->mode != X86EMUL_MODE_PROT64);
+ /* assigning eip failed; restore the old cs */
+ ops->set_segment(ctxt, old_sel, &old_desc, 0, VCPU_SREG_CS);
+ return rc;
+ }
+ return rc;
+}
+
+static int em_jmp_abs(struct x86_emulate_ctxt *ctxt)
+{
+ return assign_eip_near(ctxt, ctxt->src.val);
+}
+
+static int em_call_near_abs(struct x86_emulate_ctxt *ctxt)
+{
+ int rc;
+ long int old_eip;
+
+ old_eip = ctxt->_eip;
+ rc = assign_eip_near(ctxt, ctxt->src.val);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ ctxt->src.val = old_eip;
+ rc = em_push(ctxt);
+ return rc;
+}
+
+static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt)
+{
+ u64 old = ctxt->dst.orig_val64;
+
+ if (ctxt->dst.bytes == 16)
+ return X86EMUL_UNHANDLEABLE;
+
+ if (((u32) (old >> 0) != (u32) reg_read(ctxt, VCPU_REGS_RAX)) ||
+ ((u32) (old >> 32) != (u32) reg_read(ctxt, VCPU_REGS_RDX))) {
+ *reg_write(ctxt, VCPU_REGS_RAX) = (u32) (old >> 0);
+ *reg_write(ctxt, VCPU_REGS_RDX) = (u32) (old >> 32);
+ ctxt->eflags &= ~X86_EFLAGS_ZF;
+ } else {
+ ctxt->dst.val64 = ((u64)reg_read(ctxt, VCPU_REGS_RCX) << 32) |
+ (u32) reg_read(ctxt, VCPU_REGS_RBX);
+
+ ctxt->eflags |= X86_EFLAGS_ZF;
+ }
+ return X86EMUL_CONTINUE;
+}
+
+static int em_ret(struct x86_emulate_ctxt *ctxt)
+{
+ int rc;
+ unsigned long eip;
+
+ rc = emulate_pop(ctxt, &eip, ctxt->op_bytes);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ return assign_eip_near(ctxt, eip);
+}
+
+static int em_ret_far(struct x86_emulate_ctxt *ctxt)
+{
+ int rc;
+ unsigned long eip, cs;
+ u16 old_cs;
+ int cpl = ctxt->ops->cpl(ctxt);
+ struct desc_struct old_desc, new_desc;
+ const struct x86_emulate_ops *ops = ctxt->ops;
+
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ ops->get_segment(ctxt, &old_cs, &old_desc, NULL,
+ VCPU_SREG_CS);
+
+ rc = emulate_pop(ctxt, &eip, ctxt->op_bytes);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ rc = emulate_pop(ctxt, &cs, ctxt->op_bytes);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ /* Outer-privilege level return is not implemented */
+ if (ctxt->mode >= X86EMUL_MODE_PROT16 && (cs & 3) > cpl)
+ return X86EMUL_UNHANDLEABLE;
+ rc = __load_segment_descriptor(ctxt, (u16)cs, VCPU_SREG_CS, cpl,
+ X86_TRANSFER_RET,
+ &new_desc);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ rc = assign_eip_far(ctxt, eip, &new_desc);
+ if (rc != X86EMUL_CONTINUE) {
+ WARN_ON(ctxt->mode != X86EMUL_MODE_PROT64);
+ ops->set_segment(ctxt, old_cs, &old_desc, 0, VCPU_SREG_CS);
+ }
+ return rc;
+}
+
+static int em_ret_far_imm(struct x86_emulate_ctxt *ctxt)
+{
+ int rc;
+
+ rc = em_ret_far(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ rsp_increment(ctxt, ctxt->src.val);
+ return X86EMUL_CONTINUE;
+}
+
+static int em_cmpxchg(struct x86_emulate_ctxt *ctxt)
+{
+ /* Save real source value, then compare EAX against destination. */
+ ctxt->dst.orig_val = ctxt->dst.val;
+ ctxt->dst.val = reg_read(ctxt, VCPU_REGS_RAX);
+ ctxt->src.orig_val = ctxt->src.val;
+ ctxt->src.val = ctxt->dst.orig_val;
+ fastop(ctxt, em_cmp);
+
+ if (ctxt->eflags & X86_EFLAGS_ZF) {
+ /* Success: write back to memory; no update of EAX */
+ ctxt->src.type = OP_NONE;
+ ctxt->dst.val = ctxt->src.orig_val;
+ } else {
+ /* Failure: write the value we saw to EAX. */
+ ctxt->src.type = OP_REG;
+ ctxt->src.addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
+ ctxt->src.val = ctxt->dst.orig_val;
+ /* Create write-cycle to dest by writing the same value */
+ ctxt->dst.val = ctxt->dst.orig_val;
+ }
+ return X86EMUL_CONTINUE;
+}
+
+static int em_lseg(struct x86_emulate_ctxt *ctxt)
+{
+ int seg = ctxt->src2.val;
+ unsigned short sel;
+ int rc;
+
+ memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
+
+ rc = load_segment_descriptor(ctxt, sel, seg);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ ctxt->dst.val = ctxt->src.val;
+ return rc;
+}
+
+static void
+setup_syscalls_segments(struct x86_emulate_ctxt *ctxt,
+ struct desc_struct *cs, struct desc_struct *ss)
+{
+ cs->l = 0; /* will be adjusted later */
+ set_desc_base(cs, 0); /* flat segment */
+ cs->g = 1; /* 4kb granularity */
+ set_desc_limit(cs, 0xfffff); /* 4GB limit */
+ cs->type = 0x0b; /* Read, Execute, Accessed */
+ cs->s = 1;
+ cs->dpl = 0; /* will be adjusted later */
+ cs->p = 1;
+ cs->d = 1;
+ cs->avl = 0;
+
+ set_desc_base(ss, 0); /* flat segment */
+ set_desc_limit(ss, 0xfffff); /* 4GB limit */
+ ss->g = 1; /* 4kb granularity */
+ ss->s = 1;
+ ss->type = 0x03; /* Read/Write, Accessed */
+ ss->d = 1; /* 32bit stack segment */
+ ss->dpl = 0;
+ ss->p = 1;
+ ss->l = 0;
+ ss->avl = 0;
+}
+
+static bool vendor_intel(struct x86_emulate_ctxt *ctxt)
+{
+ u32 eax, ebx, ecx, edx;
+
+ eax = ecx = 0;
+ ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
+ return ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx
+ && ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx
+ && edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx;
+}
+
+static bool em_syscall_is_enabled(struct x86_emulate_ctxt *ctxt)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ u32 eax, ebx, ecx, edx;
+
+ /*
+ * syscall should always be enabled in longmode - so only become
+ * vendor specific (cpuid) if other modes are active...
+ */
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ return true;
+
+ eax = 0x00000000;
+ ecx = 0x00000000;
+ ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
+ /*
+ * Intel ("GenuineIntel")
+ * remark: Intel CPUs only support "syscall" in 64bit
+ * longmode. Also an 64bit guest with a
+ * 32bit compat-app running will #UD !! While this
+ * behaviour can be fixed (by emulating) into AMD
+ * response - CPUs of AMD can't behave like Intel.
+ */
+ if (ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx &&
+ ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx &&
+ edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx)
+ return false;
+
+ /* AMD ("AuthenticAMD") */
+ if (ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx &&
+ ecx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx &&
+ edx == X86EMUL_CPUID_VENDOR_AuthenticAMD_edx)
+ return true;
+
+ /* AMD ("AMDisbetter!") */
+ if (ebx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx &&
+ ecx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx &&
+ edx == X86EMUL_CPUID_VENDOR_AMDisbetterI_edx)
+ return true;
+
+ /* default: (not Intel, not AMD), apply Intel's stricter rules... */
+ return false;
+}
+
+static int em_syscall(struct x86_emulate_ctxt *ctxt)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ struct desc_struct cs, ss;
+ u64 msr_data;
+ u16 cs_sel, ss_sel;
+ u64 efer = 0;
+
+ /* syscall is not available in real mode */
+ if (ctxt->mode == X86EMUL_MODE_REAL ||
+ ctxt->mode == X86EMUL_MODE_VM86)
+ return emulate_ud(ctxt);
+
+ if (!(em_syscall_is_enabled(ctxt)))
+ return emulate_ud(ctxt);
+
+ ops->get_msr(ctxt, MSR_EFER, &efer);
+ setup_syscalls_segments(ctxt, &cs, &ss);
+
+ if (!(efer & EFER_SCE))
+ return emulate_ud(ctxt);
+
+ ops->get_msr(ctxt, MSR_STAR, &msr_data);
+ msr_data >>= 32;
+ cs_sel = (u16)(msr_data & 0xfffc);
+ ss_sel = (u16)(msr_data + 8);
+
+ if (efer & EFER_LMA) {
+ cs.d = 0;
+ cs.l = 1;
+ }
+ ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
+ ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
+
+ *reg_write(ctxt, VCPU_REGS_RCX) = ctxt->_eip;
+ if (efer & EFER_LMA) {
+#ifdef CONFIG_X86_64
+ *reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags;
+
+ ops->get_msr(ctxt,
+ ctxt->mode == X86EMUL_MODE_PROT64 ?
+ MSR_LSTAR : MSR_CSTAR, &msr_data);
+ ctxt->_eip = msr_data;
+
+ ops->get_msr(ctxt, MSR_SYSCALL_MASK, &msr_data);
+ ctxt->eflags &= ~msr_data;
+ ctxt->eflags |= X86_EFLAGS_FIXED;
+#endif
+ } else {
+ /* legacy mode */
+ ops->get_msr(ctxt, MSR_STAR, &msr_data);
+ ctxt->_eip = (u32)msr_data;
+
+ ctxt->eflags &= ~(X86_EFLAGS_VM | X86_EFLAGS_IF);
+ }
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_sysenter(struct x86_emulate_ctxt *ctxt)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ struct desc_struct cs, ss;
+ u64 msr_data;
+ u16 cs_sel, ss_sel;
+ u64 efer = 0;
+
+ ops->get_msr(ctxt, MSR_EFER, &efer);
+ /* inject #GP if in real mode */
+ if (ctxt->mode == X86EMUL_MODE_REAL)
+ return emulate_gp(ctxt, 0);
+
+ /*
+ * Not recognized on AMD in compat mode (but is recognized in legacy
+ * mode).
+ */
+ if ((ctxt->mode != X86EMUL_MODE_PROT64) && (efer & EFER_LMA)
+ && !vendor_intel(ctxt))
+ return emulate_ud(ctxt);
+
+ /* sysenter/sysexit have not been tested in 64bit mode. */
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ return X86EMUL_UNHANDLEABLE;
+
+ setup_syscalls_segments(ctxt, &cs, &ss);
+
+ ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
+ if ((msr_data & 0xfffc) == 0x0)
+ return emulate_gp(ctxt, 0);
+
+ ctxt->eflags &= ~(X86_EFLAGS_VM | X86_EFLAGS_IF);
+ cs_sel = (u16)msr_data & ~SEGMENT_RPL_MASK;
+ ss_sel = cs_sel + 8;
+ if (efer & EFER_LMA) {
+ cs.d = 0;
+ cs.l = 1;
+ }
+
+ ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
+ ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
+
+ ops->get_msr(ctxt, MSR_IA32_SYSENTER_EIP, &msr_data);
+ ctxt->_eip = (efer & EFER_LMA) ? msr_data : (u32)msr_data;
+
+ ops->get_msr(ctxt, MSR_IA32_SYSENTER_ESP, &msr_data);
+ *reg_write(ctxt, VCPU_REGS_RSP) = (efer & EFER_LMA) ? msr_data :
+ (u32)msr_data;
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_sysexit(struct x86_emulate_ctxt *ctxt)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ struct desc_struct cs, ss;
+ u64 msr_data, rcx, rdx;
+ int usermode;
+ u16 cs_sel = 0, ss_sel = 0;
+
+ /* inject #GP if in real mode or Virtual 8086 mode */
+ if (ctxt->mode == X86EMUL_MODE_REAL ||
+ ctxt->mode == X86EMUL_MODE_VM86)
+ return emulate_gp(ctxt, 0);
+
+ setup_syscalls_segments(ctxt, &cs, &ss);
+
+ if ((ctxt->rex_prefix & 0x8) != 0x0)
+ usermode = X86EMUL_MODE_PROT64;
+ else
+ usermode = X86EMUL_MODE_PROT32;
+
+ rcx = reg_read(ctxt, VCPU_REGS_RCX);
+ rdx = reg_read(ctxt, VCPU_REGS_RDX);
+
+ cs.dpl = 3;
+ ss.dpl = 3;
+ ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
+ switch (usermode) {
+ case X86EMUL_MODE_PROT32:
+ cs_sel = (u16)(msr_data + 16);
+ if ((msr_data & 0xfffc) == 0x0)
+ return emulate_gp(ctxt, 0);
+ ss_sel = (u16)(msr_data + 24);
+ rcx = (u32)rcx;
+ rdx = (u32)rdx;
+ break;
+ case X86EMUL_MODE_PROT64:
+ cs_sel = (u16)(msr_data + 32);
+ if (msr_data == 0x0)
+ return emulate_gp(ctxt, 0);
+ ss_sel = cs_sel + 8;
+ cs.d = 0;
+ cs.l = 1;
+ if (is_noncanonical_address(rcx) ||
+ is_noncanonical_address(rdx))
+ return emulate_gp(ctxt, 0);
+ break;
+ }
+ cs_sel |= SEGMENT_RPL_MASK;
+ ss_sel |= SEGMENT_RPL_MASK;
+
+ ops->set_segment(ctxt, cs_sel, &cs, 0, VCPU_SREG_CS);
+ ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
+
+ ctxt->_eip = rdx;
+ *reg_write(ctxt, VCPU_REGS_RSP) = rcx;
+
+ return X86EMUL_CONTINUE;
+}
+
+static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt)
+{
+ int iopl;
+ if (ctxt->mode == X86EMUL_MODE_REAL)
+ return false;
+ if (ctxt->mode == X86EMUL_MODE_VM86)
+ return true;
+ iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> X86_EFLAGS_IOPL_BIT;
+ return ctxt->ops->cpl(ctxt) > iopl;
+}
+
+static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt,
+ u16 port, u16 len)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ struct desc_struct tr_seg;
+ u32 base3;
+ int r;
+ u16 tr, io_bitmap_ptr, perm, bit_idx = port & 0x7;
+ unsigned mask = (1 << len) - 1;
+ unsigned long base;
+
+ ops->get_segment(ctxt, &tr, &tr_seg, &base3, VCPU_SREG_TR);
+ if (!tr_seg.p)
+ return false;
+ if (desc_limit_scaled(&tr_seg) < 103)
+ return false;
+ base = get_desc_base(&tr_seg);
+#ifdef CONFIG_X86_64
+ base |= ((u64)base3) << 32;
+#endif
+ r = ops->read_std(ctxt, base + 102, &io_bitmap_ptr, 2, NULL);
+ if (r != X86EMUL_CONTINUE)
+ return false;
+ if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg))
+ return false;
+ r = ops->read_std(ctxt, base + io_bitmap_ptr + port/8, &perm, 2, NULL);
+ if (r != X86EMUL_CONTINUE)
+ return false;
+ if ((perm >> bit_idx) & mask)
+ return false;
+ return true;
+}
+
+static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt,
+ u16 port, u16 len)
+{
+ if (ctxt->perm_ok)
+ return true;
+
+ if (emulator_bad_iopl(ctxt))
+ if (!emulator_io_port_access_allowed(ctxt, port, len))
+ return false;
+
+ ctxt->perm_ok = true;
+
+ return true;
+}
+
+static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt,
+ struct tss_segment_16 *tss)
+{
+ tss->ip = ctxt->_eip;
+ tss->flag = ctxt->eflags;
+ tss->ax = reg_read(ctxt, VCPU_REGS_RAX);
+ tss->cx = reg_read(ctxt, VCPU_REGS_RCX);
+ tss->dx = reg_read(ctxt, VCPU_REGS_RDX);
+ tss->bx = reg_read(ctxt, VCPU_REGS_RBX);
+ tss->sp = reg_read(ctxt, VCPU_REGS_RSP);
+ tss->bp = reg_read(ctxt, VCPU_REGS_RBP);
+ tss->si = reg_read(ctxt, VCPU_REGS_RSI);
+ tss->di = reg_read(ctxt, VCPU_REGS_RDI);
+
+ tss->es = get_segment_selector(ctxt, VCPU_SREG_ES);
+ tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS);
+ tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS);
+ tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS);
+ tss->ldt = get_segment_selector(ctxt, VCPU_SREG_LDTR);
+}
+
+static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt,
+ struct tss_segment_16 *tss)
+{
+ int ret;
+ u8 cpl;
+
+ ctxt->_eip = tss->ip;
+ ctxt->eflags = tss->flag | 2;
+ *reg_write(ctxt, VCPU_REGS_RAX) = tss->ax;
+ *reg_write(ctxt, VCPU_REGS_RCX) = tss->cx;
+ *reg_write(ctxt, VCPU_REGS_RDX) = tss->dx;
+ *reg_write(ctxt, VCPU_REGS_RBX) = tss->bx;
+ *reg_write(ctxt, VCPU_REGS_RSP) = tss->sp;
+ *reg_write(ctxt, VCPU_REGS_RBP) = tss->bp;
+ *reg_write(ctxt, VCPU_REGS_RSI) = tss->si;
+ *reg_write(ctxt, VCPU_REGS_RDI) = tss->di;
+
+ /*
+ * SDM says that segment selectors are loaded before segment
+ * descriptors
+ */
+ set_segment_selector(ctxt, tss->ldt, VCPU_SREG_LDTR);
+ set_segment_selector(ctxt, tss->es, VCPU_SREG_ES);
+ set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS);
+ set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS);
+ set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS);
+
+ cpl = tss->cs & 3;
+
+ /*
+ * Now load segment descriptors. If fault happens at this stage
+ * it is handled in a context of new task
+ */
+ ret = __load_segment_descriptor(ctxt, tss->ldt, VCPU_SREG_LDTR, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = __load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = __load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = __load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = __load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ return X86EMUL_CONTINUE;
+}
+
+static int task_switch_16(struct x86_emulate_ctxt *ctxt,
+ u16 tss_selector, u16 old_tss_sel,
+ ulong old_tss_base, struct desc_struct *new_desc)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ struct tss_segment_16 tss_seg;
+ int ret;
+ u32 new_tss_base = get_desc_base(new_desc);
+
+ ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
+ &ctxt->exception);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ save_state_to_tss16(ctxt, &tss_seg);
+
+ ret = ops->write_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
+ &ctxt->exception);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg,
+ &ctxt->exception);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ if (old_tss_sel != 0xffff) {
+ tss_seg.prev_task_link = old_tss_sel;
+
+ ret = ops->write_std(ctxt, new_tss_base,
+ &tss_seg.prev_task_link,
+ sizeof tss_seg.prev_task_link,
+ &ctxt->exception);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ }
+
+ return load_state_from_tss16(ctxt, &tss_seg);
+}
+
+static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt,
+ struct tss_segment_32 *tss)
+{
+ /* CR3 and ldt selector are not saved intentionally */
+ tss->eip = ctxt->_eip;
+ tss->eflags = ctxt->eflags;
+ tss->eax = reg_read(ctxt, VCPU_REGS_RAX);
+ tss->ecx = reg_read(ctxt, VCPU_REGS_RCX);
+ tss->edx = reg_read(ctxt, VCPU_REGS_RDX);
+ tss->ebx = reg_read(ctxt, VCPU_REGS_RBX);
+ tss->esp = reg_read(ctxt, VCPU_REGS_RSP);
+ tss->ebp = reg_read(ctxt, VCPU_REGS_RBP);
+ tss->esi = reg_read(ctxt, VCPU_REGS_RSI);
+ tss->edi = reg_read(ctxt, VCPU_REGS_RDI);
+
+ tss->es = get_segment_selector(ctxt, VCPU_SREG_ES);
+ tss->cs = get_segment_selector(ctxt, VCPU_SREG_CS);
+ tss->ss = get_segment_selector(ctxt, VCPU_SREG_SS);
+ tss->ds = get_segment_selector(ctxt, VCPU_SREG_DS);
+ tss->fs = get_segment_selector(ctxt, VCPU_SREG_FS);
+ tss->gs = get_segment_selector(ctxt, VCPU_SREG_GS);
+}
+
+static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt,
+ struct tss_segment_32 *tss)
+{
+ int ret;
+ u8 cpl;
+
+ if (ctxt->ops->set_cr(ctxt, 3, tss->cr3))
+ return emulate_gp(ctxt, 0);
+ ctxt->_eip = tss->eip;
+ ctxt->eflags = tss->eflags | 2;
+
+ /* General purpose registers */
+ *reg_write(ctxt, VCPU_REGS_RAX) = tss->eax;
+ *reg_write(ctxt, VCPU_REGS_RCX) = tss->ecx;
+ *reg_write(ctxt, VCPU_REGS_RDX) = tss->edx;
+ *reg_write(ctxt, VCPU_REGS_RBX) = tss->ebx;
+ *reg_write(ctxt, VCPU_REGS_RSP) = tss->esp;
+ *reg_write(ctxt, VCPU_REGS_RBP) = tss->ebp;
+ *reg_write(ctxt, VCPU_REGS_RSI) = tss->esi;
+ *reg_write(ctxt, VCPU_REGS_RDI) = tss->edi;
+
+ /*
+ * SDM says that segment selectors are loaded before segment
+ * descriptors. This is important because CPL checks will
+ * use CS.RPL.
+ */
+ set_segment_selector(ctxt, tss->ldt_selector, VCPU_SREG_LDTR);
+ set_segment_selector(ctxt, tss->es, VCPU_SREG_ES);
+ set_segment_selector(ctxt, tss->cs, VCPU_SREG_CS);
+ set_segment_selector(ctxt, tss->ss, VCPU_SREG_SS);
+ set_segment_selector(ctxt, tss->ds, VCPU_SREG_DS);
+ set_segment_selector(ctxt, tss->fs, VCPU_SREG_FS);
+ set_segment_selector(ctxt, tss->gs, VCPU_SREG_GS);
+
+ /*
+ * If we're switching between Protected Mode and VM86, we need to make
+ * sure to update the mode before loading the segment descriptors so
+ * that the selectors are interpreted correctly.
+ */
+ if (ctxt->eflags & X86_EFLAGS_VM) {
+ ctxt->mode = X86EMUL_MODE_VM86;
+ cpl = 3;
+ } else {
+ ctxt->mode = X86EMUL_MODE_PROT32;
+ cpl = tss->cs & 3;
+ }
+
+ /*
+ * Now load segment descriptors. If fault happenes at this stage
+ * it is handled in a context of new task
+ */
+ ret = __load_segment_descriptor(ctxt, tss->ldt_selector, VCPU_SREG_LDTR,
+ cpl, X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = __load_segment_descriptor(ctxt, tss->es, VCPU_SREG_ES, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = __load_segment_descriptor(ctxt, tss->cs, VCPU_SREG_CS, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = __load_segment_descriptor(ctxt, tss->ss, VCPU_SREG_SS, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = __load_segment_descriptor(ctxt, tss->ds, VCPU_SREG_DS, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = __load_segment_descriptor(ctxt, tss->fs, VCPU_SREG_FS, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = __load_segment_descriptor(ctxt, tss->gs, VCPU_SREG_GS, cpl,
+ X86_TRANSFER_TASK_SWITCH, NULL);
+
+ return ret;
+}
+
+static int task_switch_32(struct x86_emulate_ctxt *ctxt,
+ u16 tss_selector, u16 old_tss_sel,
+ ulong old_tss_base, struct desc_struct *new_desc)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ struct tss_segment_32 tss_seg;
+ int ret;
+ u32 new_tss_base = get_desc_base(new_desc);
+ u32 eip_offset = offsetof(struct tss_segment_32, eip);
+ u32 ldt_sel_offset = offsetof(struct tss_segment_32, ldt_selector);
+
+ ret = ops->read_std(ctxt, old_tss_base, &tss_seg, sizeof tss_seg,
+ &ctxt->exception);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ save_state_to_tss32(ctxt, &tss_seg);
+
+ /* Only GP registers and segment selectors are saved */
+ ret = ops->write_std(ctxt, old_tss_base + eip_offset, &tss_seg.eip,
+ ldt_sel_offset - eip_offset, &ctxt->exception);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ ret = ops->read_std(ctxt, new_tss_base, &tss_seg, sizeof tss_seg,
+ &ctxt->exception);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ if (old_tss_sel != 0xffff) {
+ tss_seg.prev_task_link = old_tss_sel;
+
+ ret = ops->write_std(ctxt, new_tss_base,
+ &tss_seg.prev_task_link,
+ sizeof tss_seg.prev_task_link,
+ &ctxt->exception);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ }
+
+ return load_state_from_tss32(ctxt, &tss_seg);
+}
+
+static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
+ u16 tss_selector, int idt_index, int reason,
+ bool has_error_code, u32 error_code)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ struct desc_struct curr_tss_desc, next_tss_desc;
+ int ret;
+ u16 old_tss_sel = get_segment_selector(ctxt, VCPU_SREG_TR);
+ ulong old_tss_base =
+ ops->get_cached_segment_base(ctxt, VCPU_SREG_TR);
+ u32 desc_limit;
+ ulong desc_addr;
+
+ /* FIXME: old_tss_base == ~0 ? */
+
+ ret = read_segment_descriptor(ctxt, tss_selector, &next_tss_desc, &desc_addr);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+ ret = read_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc, &desc_addr);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ /* FIXME: check that next_tss_desc is tss */
+
+ /*
+ * Check privileges. The three cases are task switch caused by...
+ *
+ * 1. jmp/call/int to task gate: Check against DPL of the task gate
+ * 2. Exception/IRQ/iret: No check is performed
+ * 3. jmp/call to TSS/task-gate: No check is performed since the
+ * hardware checks it before exiting.
+ */
+ if (reason == TASK_SWITCH_GATE) {
+ if (idt_index != -1) {
+ /* Software interrupts */
+ struct desc_struct task_gate_desc;
+ int dpl;
+
+ ret = read_interrupt_descriptor(ctxt, idt_index,
+ &task_gate_desc);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ dpl = task_gate_desc.dpl;
+ if ((tss_selector & 3) > dpl || ops->cpl(ctxt) > dpl)
+ return emulate_gp(ctxt, (idt_index << 3) | 0x2);
+ }
+ }
+
+ desc_limit = desc_limit_scaled(&next_tss_desc);
+ if (!next_tss_desc.p ||
+ ((desc_limit < 0x67 && (next_tss_desc.type & 8)) ||
+ desc_limit < 0x2b)) {
+ return emulate_ts(ctxt, tss_selector & 0xfffc);
+ }
+
+ if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
+ curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */
+ write_segment_descriptor(ctxt, old_tss_sel, &curr_tss_desc);
+ }
+
+ if (reason == TASK_SWITCH_IRET)
+ ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT;
+
+ /* set back link to prev task only if NT bit is set in eflags
+ note that old_tss_sel is not used after this point */
+ if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE)
+ old_tss_sel = 0xffff;
+
+ if (next_tss_desc.type & 8)
+ ret = task_switch_32(ctxt, tss_selector, old_tss_sel,
+ old_tss_base, &next_tss_desc);
+ else
+ ret = task_switch_16(ctxt, tss_selector, old_tss_sel,
+ old_tss_base, &next_tss_desc);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE)
+ ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT;
+
+ if (reason != TASK_SWITCH_IRET) {
+ next_tss_desc.type |= (1 << 1); /* set busy flag */
+ write_segment_descriptor(ctxt, tss_selector, &next_tss_desc);
+ }
+
+ ops->set_cr(ctxt, 0, ops->get_cr(ctxt, 0) | X86_CR0_TS);
+ ops->set_segment(ctxt, tss_selector, &next_tss_desc, 0, VCPU_SREG_TR);
+
+ if (has_error_code) {
+ ctxt->op_bytes = ctxt->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2;
+ ctxt->lock_prefix = 0;
+ ctxt->src.val = (unsigned long) error_code;
+ ret = em_push(ctxt);
+ }
+
+ return ret;
+}
+
+int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
+ u16 tss_selector, int idt_index, int reason,
+ bool has_error_code, u32 error_code)
+{
+ int rc;
+
+ invalidate_registers(ctxt);
+ ctxt->_eip = ctxt->eip;
+ ctxt->dst.type = OP_NONE;
+
+ rc = emulator_do_task_switch(ctxt, tss_selector, idt_index, reason,
+ has_error_code, error_code);
+
+ if (rc == X86EMUL_CONTINUE) {
+ ctxt->eip = ctxt->_eip;
+ writeback_registers(ctxt);
+ }
+
+ return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
+}
+
+static void string_addr_inc(struct x86_emulate_ctxt *ctxt, int reg,
+ struct operand *op)
+{
+ int df = (ctxt->eflags & X86_EFLAGS_DF) ? -op->count : op->count;
+
+ register_address_increment(ctxt, reg, df * op->bytes);
+ op->addr.mem.ea = register_address(ctxt, reg);
+}
+
+static int em_das(struct x86_emulate_ctxt *ctxt)
+{
+ u8 al, old_al;
+ bool af, cf, old_cf;
+
+ cf = ctxt->eflags & X86_EFLAGS_CF;
+ al = ctxt->dst.val;
+
+ old_al = al;
+ old_cf = cf;
+ cf = false;
+ af = ctxt->eflags & X86_EFLAGS_AF;
+ if ((al & 0x0f) > 9 || af) {
+ al -= 6;
+ cf = old_cf | (al >= 250);
+ af = true;
+ } else {
+ af = false;
+ }
+ if (old_al > 0x99 || old_cf) {
+ al -= 0x60;
+ cf = true;
+ }
+
+ ctxt->dst.val = al;
+ /* Set PF, ZF, SF */
+ ctxt->src.type = OP_IMM;
+ ctxt->src.val = 0;
+ ctxt->src.bytes = 1;
+ fastop(ctxt, em_or);
+ ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF);
+ if (cf)
+ ctxt->eflags |= X86_EFLAGS_CF;
+ if (af)
+ ctxt->eflags |= X86_EFLAGS_AF;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_aam(struct x86_emulate_ctxt *ctxt)
+{
+ u8 al, ah;
+
+ if (ctxt->src.val == 0)
+ return emulate_de(ctxt);
+
+ al = ctxt->dst.val & 0xff;
+ ah = al / ctxt->src.val;
+ al %= ctxt->src.val;
+
+ ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al | (ah << 8);
+
+ /* Set PF, ZF, SF */
+ ctxt->src.type = OP_IMM;
+ ctxt->src.val = 0;
+ ctxt->src.bytes = 1;
+ fastop(ctxt, em_or);
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_aad(struct x86_emulate_ctxt *ctxt)
+{
+ u8 al = ctxt->dst.val & 0xff;
+ u8 ah = (ctxt->dst.val >> 8) & 0xff;
+
+ al = (al + (ah * ctxt->src.val)) & 0xff;
+
+ ctxt->dst.val = (ctxt->dst.val & 0xffff0000) | al;
+
+ /* Set PF, ZF, SF */
+ ctxt->src.type = OP_IMM;
+ ctxt->src.val = 0;
+ ctxt->src.bytes = 1;
+ fastop(ctxt, em_or);
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_call(struct x86_emulate_ctxt *ctxt)
+{
+ int rc;
+ long rel = ctxt->src.val;
+
+ ctxt->src.val = (unsigned long)ctxt->_eip;
+ rc = jmp_rel(ctxt, rel);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ return em_push(ctxt);
+}
+
+static int em_call_far(struct x86_emulate_ctxt *ctxt)
+{
+ u16 sel, old_cs;
+ ulong old_eip;
+ int rc;
+ struct desc_struct old_desc, new_desc;
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ int cpl = ctxt->ops->cpl(ctxt);
+ enum x86emul_mode prev_mode = ctxt->mode;
+
+ old_eip = ctxt->_eip;
+ ops->get_segment(ctxt, &old_cs, &old_desc, NULL, VCPU_SREG_CS);
+
+ memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
+ rc = __load_segment_descriptor(ctxt, sel, VCPU_SREG_CS, cpl,
+ X86_TRANSFER_CALL_JMP, &new_desc);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc);
+ if (rc != X86EMUL_CONTINUE)
+ goto fail;
+
+ ctxt->src.val = old_cs;
+ rc = em_push(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ goto fail;
+
+ ctxt->src.val = old_eip;
+ rc = em_push(ctxt);
+ /* If we failed, we tainted the memory, but the very least we should
+ restore cs */
+ if (rc != X86EMUL_CONTINUE) {
+ pr_warn_once("faulting far call emulation tainted memory\n");
+ goto fail;
+ }
+ return rc;
+fail:
+ ops->set_segment(ctxt, old_cs, &old_desc, 0, VCPU_SREG_CS);
+ ctxt->mode = prev_mode;
+ return rc;
+
+}
+
+static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
+{
+ int rc;
+ unsigned long eip;
+
+ rc = emulate_pop(ctxt, &eip, ctxt->op_bytes);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ rc = assign_eip_near(ctxt, eip);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ rsp_increment(ctxt, ctxt->src.val);
+ return X86EMUL_CONTINUE;
+}
+
+static int em_xchg(struct x86_emulate_ctxt *ctxt)
+{
+ /* Write back the register source. */
+ ctxt->src.val = ctxt->dst.val;
+ write_register_operand(&ctxt->src);
+
+ /* Write back the memory destination with implicit LOCK prefix. */
+ ctxt->dst.val = ctxt->src.orig_val;
+ ctxt->lock_prefix = 1;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
+{
+ ctxt->dst.val = ctxt->src2.val;
+ return fastop(ctxt, em_imul);
+}
+
+static int em_cwd(struct x86_emulate_ctxt *ctxt)
+{
+ ctxt->dst.type = OP_REG;
+ ctxt->dst.bytes = ctxt->src.bytes;
+ ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
+ ctxt->dst.val = ~((ctxt->src.val >> (ctxt->src.bytes * 8 - 1)) - 1);
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
+{
+ u64 tsc = 0;
+
+ ctxt->ops->get_msr(ctxt, MSR_IA32_TSC, &tsc);
+ *reg_write(ctxt, VCPU_REGS_RAX) = (u32)tsc;
+ *reg_write(ctxt, VCPU_REGS_RDX) = tsc >> 32;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_rdpmc(struct x86_emulate_ctxt *ctxt)
+{
+ u64 pmc;
+
+ if (ctxt->ops->read_pmc(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &pmc))
+ return emulate_gp(ctxt, 0);
+ *reg_write(ctxt, VCPU_REGS_RAX) = (u32)pmc;
+ *reg_write(ctxt, VCPU_REGS_RDX) = pmc >> 32;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_mov(struct x86_emulate_ctxt *ctxt)
+{
+ memcpy(ctxt->dst.valptr, ctxt->src.valptr, sizeof(ctxt->src.valptr));
+ return X86EMUL_CONTINUE;
+}
+
+#define FFL(x) bit(X86_FEATURE_##x)
+
+static int em_movbe(struct x86_emulate_ctxt *ctxt)
+{
+ u32 ebx, ecx, edx, eax = 1;
+ u16 tmp;
+
+ /*
+ * Check MOVBE is set in the guest-visible CPUID leaf.
+ */
+ ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
+ if (!(ecx & FFL(MOVBE)))
+ return emulate_ud(ctxt);
+
+ switch (ctxt->op_bytes) {
+ case 2:
+ /*
+ * From MOVBE definition: "...When the operand size is 16 bits,
+ * the upper word of the destination register remains unchanged
+ * ..."
+ *
+ * Both casting ->valptr and ->val to u16 breaks strict aliasing
+ * rules so we have to do the operation almost per hand.
+ */
+ tmp = (u16)ctxt->src.val;
+ ctxt->dst.val &= ~0xffffUL;
+ ctxt->dst.val |= (unsigned long)swab16(tmp);
+ break;
+ case 4:
+ ctxt->dst.val = swab32((u32)ctxt->src.val);
+ break;
+ case 8:
+ ctxt->dst.val = swab64(ctxt->src.val);
+ break;
+ default:
+ BUG();
+ }
+ return X86EMUL_CONTINUE;
+}
+
+static int em_cr_write(struct x86_emulate_ctxt *ctxt)
+{
+ if (ctxt->ops->set_cr(ctxt, ctxt->modrm_reg, ctxt->src.val))
+ return emulate_gp(ctxt, 0);
+
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_dr_write(struct x86_emulate_ctxt *ctxt)
+{
+ unsigned long val;
+
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ val = ctxt->src.val & ~0ULL;
+ else
+ val = ctxt->src.val & ~0U;
+
+ /* #UD condition is already handled. */
+ if (ctxt->ops->set_dr(ctxt, ctxt->modrm_reg, val) < 0)
+ return emulate_gp(ctxt, 0);
+
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_wrmsr(struct x86_emulate_ctxt *ctxt)
+{
+ u64 msr_data;
+
+ msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX)
+ | ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32);
+ if (ctxt->ops->set_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), msr_data))
+ return emulate_gp(ctxt, 0);
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_rdmsr(struct x86_emulate_ctxt *ctxt)
+{
+ u64 msr_data;
+
+ if (ctxt->ops->get_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &msr_data))
+ return emulate_gp(ctxt, 0);
+
+ *reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data;
+ *reg_write(ctxt, VCPU_REGS_RDX) = msr_data >> 32;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt)
+{
+ if (ctxt->modrm_reg > VCPU_SREG_GS)
+ return emulate_ud(ctxt);
+
+ ctxt->dst.val = get_segment_selector(ctxt, ctxt->modrm_reg);
+ if (ctxt->dst.bytes == 4 && ctxt->dst.type == OP_MEM)
+ ctxt->dst.bytes = 2;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt)
+{
+ u16 sel = ctxt->src.val;
+
+ if (ctxt->modrm_reg == VCPU_SREG_CS || ctxt->modrm_reg > VCPU_SREG_GS)
+ return emulate_ud(ctxt);
+
+ if (ctxt->modrm_reg == VCPU_SREG_SS)
+ ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
+
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg);
+}
+
+static int em_lldt(struct x86_emulate_ctxt *ctxt)
+{
+ u16 sel = ctxt->src.val;
+
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR);
+}
+
+static int em_ltr(struct x86_emulate_ctxt *ctxt)
+{
+ u16 sel = ctxt->src.val;
+
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return load_segment_descriptor(ctxt, sel, VCPU_SREG_TR);
+}
+
+static int em_invlpg(struct x86_emulate_ctxt *ctxt)
+{
+ int rc;
+ ulong linear;
+
+ rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear);
+ if (rc == X86EMUL_CONTINUE)
+ ctxt->ops->invlpg(ctxt, linear);
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_clts(struct x86_emulate_ctxt *ctxt)
+{
+ ulong cr0;
+
+ cr0 = ctxt->ops->get_cr(ctxt, 0);
+ cr0 &= ~X86_CR0_TS;
+ ctxt->ops->set_cr(ctxt, 0, cr0);
+ return X86EMUL_CONTINUE;
+}
+
+static int em_hypercall(struct x86_emulate_ctxt *ctxt)
+{
+ int rc = ctxt->ops->fix_hypercall(ctxt);
+
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ /* Let the processor re-execute the fixed hypercall */
+ ctxt->_eip = ctxt->eip;
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return X86EMUL_CONTINUE;
+}
+
+static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt,
+ void (*get)(struct x86_emulate_ctxt *ctxt,
+ struct desc_ptr *ptr))
+{
+ struct desc_ptr desc_ptr;
+
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ ctxt->op_bytes = 8;
+ get(ctxt, &desc_ptr);
+ if (ctxt->op_bytes == 2) {
+ ctxt->op_bytes = 4;
+ desc_ptr.address &= 0x00ffffff;
+ }
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return segmented_write(ctxt, ctxt->dst.addr.mem,
+ &desc_ptr, 2 + ctxt->op_bytes);
+}
+
+static int em_sgdt(struct x86_emulate_ctxt *ctxt)
+{
+ return emulate_store_desc_ptr(ctxt, ctxt->ops->get_gdt);
+}
+
+static int em_sidt(struct x86_emulate_ctxt *ctxt)
+{
+ return emulate_store_desc_ptr(ctxt, ctxt->ops->get_idt);
+}
+
+static int em_lgdt_lidt(struct x86_emulate_ctxt *ctxt, bool lgdt)
+{
+ struct desc_ptr desc_ptr;
+ int rc;
+
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ ctxt->op_bytes = 8;
+ rc = read_descriptor(ctxt, ctxt->src.addr.mem,
+ &desc_ptr.size, &desc_ptr.address,
+ ctxt->op_bytes);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ if (ctxt->mode == X86EMUL_MODE_PROT64 &&
+ is_noncanonical_address(desc_ptr.address))
+ return emulate_gp(ctxt, 0);
+ if (lgdt)
+ ctxt->ops->set_gdt(ctxt, &desc_ptr);
+ else
+ ctxt->ops->set_idt(ctxt, &desc_ptr);
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_lgdt(struct x86_emulate_ctxt *ctxt)
+{
+ return em_lgdt_lidt(ctxt, true);
+}
+
+static int em_lidt(struct x86_emulate_ctxt *ctxt)
+{
+ return em_lgdt_lidt(ctxt, false);
+}
+
+static int em_smsw(struct x86_emulate_ctxt *ctxt)
+{
+ if (ctxt->dst.type == OP_MEM)
+ ctxt->dst.bytes = 2;
+ ctxt->dst.val = ctxt->ops->get_cr(ctxt, 0);
+ return X86EMUL_CONTINUE;
+}
+
+static int em_lmsw(struct x86_emulate_ctxt *ctxt)
+{
+ ctxt->ops->set_cr(ctxt, 0, (ctxt->ops->get_cr(ctxt, 0) & ~0x0eul)
+ | (ctxt->src.val & 0x0f));
+ ctxt->dst.type = OP_NONE;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_loop(struct x86_emulate_ctxt *ctxt)
+{
+ int rc = X86EMUL_CONTINUE;
+
+ register_address_increment(ctxt, VCPU_REGS_RCX, -1);
+ if ((address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) != 0) &&
+ (ctxt->b == 0xe2 || test_cc(ctxt->b ^ 0x5, ctxt->eflags)))
+ rc = jmp_rel(ctxt, ctxt->src.val);
+
+ return rc;
+}
+
+static int em_jcxz(struct x86_emulate_ctxt *ctxt)
+{
+ int rc = X86EMUL_CONTINUE;
+
+ if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0)
+ rc = jmp_rel(ctxt, ctxt->src.val);
+
+ return rc;
+}
+
+static int em_in(struct x86_emulate_ctxt *ctxt)
+{
+ if (!pio_in_emulated(ctxt, ctxt->dst.bytes, ctxt->src.val,
+ &ctxt->dst.val))
+ return X86EMUL_IO_NEEDED;
+
+ return X86EMUL_CONTINUE;
+}
+
+static int em_out(struct x86_emulate_ctxt *ctxt)
+{
+ ctxt->ops->pio_out_emulated(ctxt, ctxt->src.bytes, ctxt->dst.val,
+ &ctxt->src.val, 1);
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_cli(struct x86_emulate_ctxt *ctxt)
+{
+ if (emulator_bad_iopl(ctxt))
+ return emulate_gp(ctxt, 0);
+
+ ctxt->eflags &= ~X86_EFLAGS_IF;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_sti(struct x86_emulate_ctxt *ctxt)
+{
+ if (emulator_bad_iopl(ctxt))
+ return emulate_gp(ctxt, 0);
+
+ ctxt->interruptibility = KVM_X86_SHADOW_INT_STI;
+ ctxt->eflags |= X86_EFLAGS_IF;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_cpuid(struct x86_emulate_ctxt *ctxt)
+{
+ u32 eax, ebx, ecx, edx;
+
+ eax = reg_read(ctxt, VCPU_REGS_RAX);
+ ecx = reg_read(ctxt, VCPU_REGS_RCX);
+ ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
+ *reg_write(ctxt, VCPU_REGS_RAX) = eax;
+ *reg_write(ctxt, VCPU_REGS_RBX) = ebx;
+ *reg_write(ctxt, VCPU_REGS_RCX) = ecx;
+ *reg_write(ctxt, VCPU_REGS_RDX) = edx;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_sahf(struct x86_emulate_ctxt *ctxt)
+{
+ u32 flags;
+
+ flags = X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF |
+ X86_EFLAGS_SF;
+ flags &= *reg_rmw(ctxt, VCPU_REGS_RAX) >> 8;
+
+ ctxt->eflags &= ~0xffUL;
+ ctxt->eflags |= flags | X86_EFLAGS_FIXED;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_lahf(struct x86_emulate_ctxt *ctxt)
+{
+ *reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL;
+ *reg_rmw(ctxt, VCPU_REGS_RAX) |= (ctxt->eflags & 0xff) << 8;
+ return X86EMUL_CONTINUE;
+}
+
+static int em_bswap(struct x86_emulate_ctxt *ctxt)
+{
+ switch (ctxt->op_bytes) {
+#ifdef CONFIG_X86_64
+ case 8:
+ asm("bswap %0" : "+r"(ctxt->dst.val));
+ break;
+#endif
+ default:
+ asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val));
+ break;
+ }
+ return X86EMUL_CONTINUE;
+}
+
+static int em_clflush(struct x86_emulate_ctxt *ctxt)
+{
+ /* emulating clflush regardless of cpuid */
+ return X86EMUL_CONTINUE;
+}
+
+static int em_movsxd(struct x86_emulate_ctxt *ctxt)
+{
+ ctxt->dst.val = (s32) ctxt->src.val;
+ return X86EMUL_CONTINUE;
+}
+
+static bool valid_cr(int nr)
+{
+ switch (nr) {
+ case 0:
+ case 2 ... 4:
+ case 8:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static int check_cr_read(struct x86_emulate_ctxt *ctxt)
+{
+ if (!valid_cr(ctxt->modrm_reg))
+ return emulate_ud(ctxt);
+
+ return X86EMUL_CONTINUE;
+}
+
+static int check_cr_write(struct x86_emulate_ctxt *ctxt)
+{
+ u64 new_val = ctxt->src.val64;
+ int cr = ctxt->modrm_reg;
+ u64 efer = 0;
+
+ static u64 cr_reserved_bits[] = {
+ 0xffffffff00000000ULL,
+ 0, 0, 0, /* CR3 checked later */
+ CR4_RESERVED_BITS,
+ 0, 0, 0,
+ CR8_RESERVED_BITS,
+ };
+
+ if (!valid_cr(cr))
+ return emulate_ud(ctxt);
+
+ if (new_val & cr_reserved_bits[cr])
+ return emulate_gp(ctxt, 0);
+
+ switch (cr) {
+ case 0: {
+ u64 cr4;
+ if (((new_val & X86_CR0_PG) && !(new_val & X86_CR0_PE)) ||
+ ((new_val & X86_CR0_NW) && !(new_val & X86_CR0_CD)))
+ return emulate_gp(ctxt, 0);
+
+ cr4 = ctxt->ops->get_cr(ctxt, 4);
+ ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
+
+ if ((new_val & X86_CR0_PG) && (efer & EFER_LME) &&
+ !(cr4 & X86_CR4_PAE))
+ return emulate_gp(ctxt, 0);
+
+ break;
+ }
+ case 3: {
+ u64 rsvd = 0;
+
+ ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
+ if (efer & EFER_LMA)
+ rsvd = CR3_L_MODE_RESERVED_BITS & ~CR3_PCID_INVD;
+
+ if (new_val & rsvd)
+ return emulate_gp(ctxt, 0);
+
+ break;
+ }
+ case 4: {
+ ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
+
+ if ((efer & EFER_LMA) && !(new_val & X86_CR4_PAE))
+ return emulate_gp(ctxt, 0);
+
+ break;
+ }
+ }
+
+ return X86EMUL_CONTINUE;
+}
+
+static int check_dr7_gd(struct x86_emulate_ctxt *ctxt)
+{
+ unsigned long dr7;
+
+ ctxt->ops->get_dr(ctxt, 7, &dr7);
+
+ /* Check if DR7.Global_Enable is set */
+ return dr7 & (1 << 13);
+}
+
+static int check_dr_read(struct x86_emulate_ctxt *ctxt)
+{
+ int dr = ctxt->modrm_reg;
+ u64 cr4;
+
+ if (dr > 7)
+ return emulate_ud(ctxt);
+
+ cr4 = ctxt->ops->get_cr(ctxt, 4);
+ if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5))
+ return emulate_ud(ctxt);
+
+ if (check_dr7_gd(ctxt)) {
+ ulong dr6;
+
+ ctxt->ops->get_dr(ctxt, 6, &dr6);
+ dr6 &= ~15;
+ dr6 |= DR6_BD | DR6_RTM;
+ ctxt->ops->set_dr(ctxt, 6, dr6);
+ return emulate_db(ctxt);
+ }
+
+ return X86EMUL_CONTINUE;
+}
+
+static int check_dr_write(struct x86_emulate_ctxt *ctxt)
+{
+ u64 new_val = ctxt->src.val64;
+ int dr = ctxt->modrm_reg;
+
+ if ((dr == 6 || dr == 7) && (new_val & 0xffffffff00000000ULL))
+ return emulate_gp(ctxt, 0);
+
+ return check_dr_read(ctxt);
+}
+
+static int check_svme(struct x86_emulate_ctxt *ctxt)
+{
+ u64 efer;
+
+ ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
+
+ if (!(efer & EFER_SVME))
+ return emulate_ud(ctxt);
+
+ return X86EMUL_CONTINUE;
+}
+
+static int check_svme_pa(struct x86_emulate_ctxt *ctxt)
+{
+ u64 rax = reg_read(ctxt, VCPU_REGS_RAX);
+
+ /* Valid physical address? */
+ if (rax & 0xffff000000000000ULL)
+ return emulate_gp(ctxt, 0);
+
+ return check_svme(ctxt);
+}
+
+static int check_rdtsc(struct x86_emulate_ctxt *ctxt)
+{
+ u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
+
+ if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt))
+ return emulate_ud(ctxt);
+
+ return X86EMUL_CONTINUE;
+}
+
+static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
+{
+ u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
+ u64 rcx = reg_read(ctxt, VCPU_REGS_RCX);
+
+ if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) ||
+ ctxt->ops->check_pmc(ctxt, rcx))
+ return emulate_gp(ctxt, 0);
+
+ return X86EMUL_CONTINUE;
+}
+
+static int check_perm_in(struct x86_emulate_ctxt *ctxt)
+{
+ ctxt->dst.bytes = min(ctxt->dst.bytes, 4u);
+ if (!emulator_io_permited(ctxt, ctxt->src.val, ctxt->dst.bytes))
+ return emulate_gp(ctxt, 0);
+
+ return X86EMUL_CONTINUE;
+}
+
+static int check_perm_out(struct x86_emulate_ctxt *ctxt)
+{
+ ctxt->src.bytes = min(ctxt->src.bytes, 4u);
+ if (!emulator_io_permited(ctxt, ctxt->dst.val, ctxt->src.bytes))
+ return emulate_gp(ctxt, 0);
+
+ return X86EMUL_CONTINUE;
+}
+
+#define D(_y) { .flags = (_y) }
+#define DI(_y, _i) { .flags = (_y)|Intercept, .intercept = x86_intercept_##_i }
+#define DIP(_y, _i, _p) { .flags = (_y)|Intercept|CheckPerm, \
+ .intercept = x86_intercept_##_i, .check_perm = (_p) }
+#define N D(NotImpl)
+#define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) }
+#define G(_f, _g) { .flags = ((_f) | Group | ModRM), .u.group = (_g) }
+#define GD(_f, _g) { .flags = ((_f) | GroupDual | ModRM), .u.gdual = (_g) }
+#define ID(_f, _i) { .flags = ((_f) | InstrDual | ModRM), .u.idual = (_i) }
+#define MD(_f, _m) { .flags = ((_f) | ModeDual), .u.mdual = (_m) }
+#define E(_f, _e) { .flags = ((_f) | Escape | ModRM), .u.esc = (_e) }
+#define I(_f, _e) { .flags = (_f), .u.execute = (_e) }
+#define F(_f, _e) { .flags = (_f) | Fastop, .u.fastop = (_e) }
+#define II(_f, _e, _i) \
+ { .flags = (_f)|Intercept, .u.execute = (_e), .intercept = x86_intercept_##_i }
+#define IIP(_f, _e, _i, _p) \
+ { .flags = (_f)|Intercept|CheckPerm, .u.execute = (_e), \
+ .intercept = x86_intercept_##_i, .check_perm = (_p) }
+#define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) }
+
+#define D2bv(_f) D((_f) | ByteOp), D(_f)
+#define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p)
+#define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e)
+#define F2bv(_f, _e) F((_f) | ByteOp, _e), F(_f, _e)
+#define I2bvIP(_f, _e, _i, _p) \
+ IIP((_f) | ByteOp, _e, _i, _p), IIP(_f, _e, _i, _p)
+
+#define F6ALU(_f, _e) F2bv((_f) | DstMem | SrcReg | ModRM, _e), \
+ F2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock, _e), \
+ F2bv(((_f) & ~Lock) | DstAcc | SrcImm, _e)
+
+static const struct opcode group7_rm0[] = {
+ N,
+ I(SrcNone | Priv | EmulateOnUD, em_hypercall),
+ N, N, N, N, N, N,
+};
+
+static const struct opcode group7_rm1[] = {
+ DI(SrcNone | Priv, monitor),
+ DI(SrcNone | Priv, mwait),
+ N, N, N, N, N, N,
+};
+
+static const struct opcode group7_rm3[] = {
+ DIP(SrcNone | Prot | Priv, vmrun, check_svme_pa),
+ II(SrcNone | Prot | EmulateOnUD, em_hypercall, vmmcall),
+ DIP(SrcNone | Prot | Priv, vmload, check_svme_pa),
+ DIP(SrcNone | Prot | Priv, vmsave, check_svme_pa),
+ DIP(SrcNone | Prot | Priv, stgi, check_svme),
+ DIP(SrcNone | Prot | Priv, clgi, check_svme),
+ DIP(SrcNone | Prot | Priv, skinit, check_svme),
+ DIP(SrcNone | Prot | Priv, invlpga, check_svme),
+};
+
+static const struct opcode group7_rm7[] = {
+ N,
+ DIP(SrcNone, rdtscp, check_rdtsc),
+ N, N, N, N, N, N,
+};
+
+static const struct opcode group1[] = {
+ F(Lock, em_add),
+ F(Lock | PageTable, em_or),
+ F(Lock, em_adc),
+ F(Lock, em_sbb),
+ F(Lock | PageTable, em_and),
+ F(Lock, em_sub),
+ F(Lock, em_xor),
+ F(NoWrite, em_cmp),
+};
+
+static const struct opcode group1A[] = {
+ I(DstMem | SrcNone | Mov | Stack | IncSP, em_pop), N, N, N, N, N, N, N,
+};
+
+static const struct opcode group2[] = {
+ F(DstMem | ModRM, em_rol),
+ F(DstMem | ModRM, em_ror),
+ F(DstMem | ModRM, em_rcl),
+ F(DstMem | ModRM, em_rcr),
+ F(DstMem | ModRM, em_shl),
+ F(DstMem | ModRM, em_shr),
+ F(DstMem | ModRM, em_shl),
+ F(DstMem | ModRM, em_sar),
+};
+
+static const struct opcode group3[] = {
+ F(DstMem | SrcImm | NoWrite, em_test),
+ F(DstMem | SrcImm | NoWrite, em_test),
+ F(DstMem | SrcNone | Lock, em_not),
+ F(DstMem | SrcNone | Lock, em_neg),
+ F(DstXacc | Src2Mem, em_mul_ex),
+ F(DstXacc | Src2Mem, em_imul_ex),
+ F(DstXacc | Src2Mem, em_div_ex),
+ F(DstXacc | Src2Mem, em_idiv_ex),
+};
+
+static const struct opcode group4[] = {
+ F(ByteOp | DstMem | SrcNone | Lock, em_inc),
+ F(ByteOp | DstMem | SrcNone | Lock, em_dec),
+ N, N, N, N, N, N,
+};
+
+static const struct opcode group5[] = {
+ F(DstMem | SrcNone | Lock, em_inc),
+ F(DstMem | SrcNone | Lock, em_dec),
+ I(SrcMem | NearBranch, em_call_near_abs),
+ I(SrcMemFAddr | ImplicitOps | Stack, em_call_far),
+ I(SrcMem | NearBranch, em_jmp_abs),
+ I(SrcMemFAddr | ImplicitOps, em_jmp_far),
+ I(SrcMem | Stack, em_push), D(Undefined),
+};
+
+static const struct opcode group6[] = {
+ DI(Prot | DstMem, sldt),
+ DI(Prot | DstMem, str),
+ II(Prot | Priv | SrcMem16, em_lldt, lldt),
+ II(Prot | Priv | SrcMem16, em_ltr, ltr),
+ N, N, N, N,
+};
+
+static const struct group_dual group7 = { {
+ II(Mov | DstMem, em_sgdt, sgdt),
+ II(Mov | DstMem, em_sidt, sidt),
+ II(SrcMem | Priv, em_lgdt, lgdt),
+ II(SrcMem | Priv, em_lidt, lidt),
+ II(SrcNone | DstMem | Mov, em_smsw, smsw), N,
+ II(SrcMem16 | Mov | Priv, em_lmsw, lmsw),
+ II(SrcMem | ByteOp | Priv | NoAccess, em_invlpg, invlpg),
+}, {
+ EXT(0, group7_rm0),
+ EXT(0, group7_rm1),
+ N, EXT(0, group7_rm3),
+ II(SrcNone | DstMem | Mov, em_smsw, smsw), N,
+ II(SrcMem16 | Mov | Priv, em_lmsw, lmsw),
+ EXT(0, group7_rm7),
+} };
+
+static const struct opcode group8[] = {
+ N, N, N, N,
+ F(DstMem | SrcImmByte | NoWrite, em_bt),
+ F(DstMem | SrcImmByte | Lock | PageTable, em_bts),
+ F(DstMem | SrcImmByte | Lock, em_btr),
+ F(DstMem | SrcImmByte | Lock | PageTable, em_btc),
+};
+
+static const struct group_dual group9 = { {
+ N, I(DstMem64 | Lock | PageTable, em_cmpxchg8b), N, N, N, N, N, N,
+}, {
+ N, N, N, N, N, N, N, N,
+} };
+
+static const struct opcode group11[] = {
+ I(DstMem | SrcImm | Mov | PageTable, em_mov),
+ X7(D(Undefined)),
+};
+
+static const struct gprefix pfx_0f_ae_7 = {
+ I(SrcMem | ByteOp, em_clflush), N, N, N,
+};
+
+static const struct group_dual group15 = { {
+ N, N, N, N, N, N, N, GP(0, &pfx_0f_ae_7),
+}, {
+ N, N, N, N, N, N, N, N,
+} };
+
+static const struct gprefix pfx_0f_6f_0f_7f = {
+ I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov),
+};
+
+static const struct instr_dual instr_dual_0f_2b = {
+ I(0, em_mov), N
+};
+
+static const struct gprefix pfx_0f_2b = {
+ ID(0, &instr_dual_0f_2b), ID(0, &instr_dual_0f_2b), N, N,
+};
+
+static const struct gprefix pfx_0f_28_0f_29 = {
+ I(Aligned, em_mov), I(Aligned, em_mov), N, N,
+};
+
+static const struct gprefix pfx_0f_e7 = {
+ N, I(Sse, em_mov), N, N,
+};
+
+static const struct escape escape_d9 = { {
+ N, N, N, N, N, N, N, I(DstMem16 | Mov, em_fnstcw),
+}, {
+ /* 0xC0 - 0xC7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xC8 - 0xCF */
+ N, N, N, N, N, N, N, N,
+ /* 0xD0 - 0xC7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xD8 - 0xDF */
+ N, N, N, N, N, N, N, N,
+ /* 0xE0 - 0xE7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xE8 - 0xEF */
+ N, N, N, N, N, N, N, N,
+ /* 0xF0 - 0xF7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xF8 - 0xFF */
+ N, N, N, N, N, N, N, N,
+} };
+
+static const struct escape escape_db = { {
+ N, N, N, N, N, N, N, N,
+}, {
+ /* 0xC0 - 0xC7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xC8 - 0xCF */
+ N, N, N, N, N, N, N, N,
+ /* 0xD0 - 0xC7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xD8 - 0xDF */
+ N, N, N, N, N, N, N, N,
+ /* 0xE0 - 0xE7 */
+ N, N, N, I(ImplicitOps, em_fninit), N, N, N, N,
+ /* 0xE8 - 0xEF */
+ N, N, N, N, N, N, N, N,
+ /* 0xF0 - 0xF7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xF8 - 0xFF */
+ N, N, N, N, N, N, N, N,
+} };
+
+static const struct escape escape_dd = { {
+ N, N, N, N, N, N, N, I(DstMem16 | Mov, em_fnstsw),
+}, {
+ /* 0xC0 - 0xC7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xC8 - 0xCF */
+ N, N, N, N, N, N, N, N,
+ /* 0xD0 - 0xC7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xD8 - 0xDF */
+ N, N, N, N, N, N, N, N,
+ /* 0xE0 - 0xE7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xE8 - 0xEF */
+ N, N, N, N, N, N, N, N,
+ /* 0xF0 - 0xF7 */
+ N, N, N, N, N, N, N, N,
+ /* 0xF8 - 0xFF */
+ N, N, N, N, N, N, N, N,
+} };
+
+static const struct instr_dual instr_dual_0f_c3 = {
+ I(DstMem | SrcReg | ModRM | No16 | Mov, em_mov), N
+};
+
+static const struct mode_dual mode_dual_63 = {
+ N, I(DstReg | SrcMem32 | ModRM | Mov, em_movsxd)
+};
+
+static const struct opcode opcode_table[256] = {
+ /* 0x00 - 0x07 */
+ F6ALU(Lock, em_add),
+ I(ImplicitOps | Stack | No64 | Src2ES, em_push_sreg),
+ I(ImplicitOps | Stack | No64 | Src2ES, em_pop_sreg),
+ /* 0x08 - 0x0F */
+ F6ALU(Lock | PageTable, em_or),
+ I(ImplicitOps | Stack | No64 | Src2CS, em_push_sreg),
+ N,
+ /* 0x10 - 0x17 */
+ F6ALU(Lock, em_adc),
+ I(ImplicitOps | Stack | No64 | Src2SS, em_push_sreg),
+ I(ImplicitOps | Stack | No64 | Src2SS, em_pop_sreg),
+ /* 0x18 - 0x1F */
+ F6ALU(Lock, em_sbb),
+ I(ImplicitOps | Stack | No64 | Src2DS, em_push_sreg),
+ I(ImplicitOps | Stack | No64 | Src2DS, em_pop_sreg),
+ /* 0x20 - 0x27 */
+ F6ALU(Lock | PageTable, em_and), N, N,
+ /* 0x28 - 0x2F */
+ F6ALU(Lock, em_sub), N, I(ByteOp | DstAcc | No64, em_das),
+ /* 0x30 - 0x37 */
+ F6ALU(Lock, em_xor), N, N,
+ /* 0x38 - 0x3F */
+ F6ALU(NoWrite, em_cmp), N, N,
+ /* 0x40 - 0x4F */
+ X8(F(DstReg, em_inc)), X8(F(DstReg, em_dec)),
+ /* 0x50 - 0x57 */
+ X8(I(SrcReg | Stack, em_push)),
+ /* 0x58 - 0x5F */
+ X8(I(DstReg | Stack, em_pop)),
+ /* 0x60 - 0x67 */
+ I(ImplicitOps | Stack | No64, em_pusha),
+ I(ImplicitOps | Stack | No64, em_popa),
+ N, MD(ModRM, &mode_dual_63),
+ N, N, N, N,
+ /* 0x68 - 0x6F */
+ I(SrcImm | Mov | Stack, em_push),
+ I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op),
+ I(SrcImmByte | Mov | Stack, em_push),
+ I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op),
+ I2bvIP(DstDI | SrcDX | Mov | String | Unaligned, em_in, ins, check_perm_in), /* insb, insw/insd */
+ I2bvIP(SrcSI | DstDX | String, em_out, outs, check_perm_out), /* outsb, outsw/outsd */
+ /* 0x70 - 0x7F */
+ X16(D(SrcImmByte | NearBranch)),
+ /* 0x80 - 0x87 */
+ G(ByteOp | DstMem | SrcImm, group1),
+ G(DstMem | SrcImm, group1),
+ G(ByteOp | DstMem | SrcImm | No64, group1),
+ G(DstMem | SrcImmByte, group1),
+ F2bv(DstMem | SrcReg | ModRM | NoWrite, em_test),
+ I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_xchg),
+ /* 0x88 - 0x8F */
+ I2bv(DstMem | SrcReg | ModRM | Mov | PageTable, em_mov),
+ I2bv(DstReg | SrcMem | ModRM | Mov, em_mov),
+ I(DstMem | SrcNone | ModRM | Mov | PageTable, em_mov_rm_sreg),
+ D(ModRM | SrcMem | NoAccess | DstReg),
+ I(ImplicitOps | SrcMem16 | ModRM, em_mov_sreg_rm),
+ G(0, group1A),
+ /* 0x90 - 0x97 */
+ DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)),
+ /* 0x98 - 0x9F */
+ D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),
+ I(SrcImmFAddr | No64, em_call_far), N,
+ II(ImplicitOps | Stack, em_pushf, pushf),
+ II(ImplicitOps | Stack, em_popf, popf),
+ I(ImplicitOps, em_sahf), I(ImplicitOps, em_lahf),
+ /* 0xA0 - 0xA7 */
+ I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
+ I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov),
+ I2bv(SrcSI | DstDI | Mov | String, em_mov),
+ F2bv(SrcSI | DstDI | String | NoWrite, em_cmp_r),
+ /* 0xA8 - 0xAF */
+ F2bv(DstAcc | SrcImm | NoWrite, em_test),
+ I2bv(SrcAcc | DstDI | Mov | String, em_mov),
+ I2bv(SrcSI | DstAcc | Mov | String, em_mov),
+ F2bv(SrcAcc | DstDI | String | NoWrite, em_cmp_r),
+ /* 0xB0 - 0xB7 */
+ X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),
+ /* 0xB8 - 0xBF */
+ X8(I(DstReg | SrcImm64 | Mov, em_mov)),
+ /* 0xC0 - 0xC7 */
+ G(ByteOp | Src2ImmByte, group2), G(Src2ImmByte, group2),
+ I(ImplicitOps | NearBranch | SrcImmU16, em_ret_near_imm),
+ I(ImplicitOps | NearBranch, em_ret),
+ I(DstReg | SrcMemFAddr | ModRM | No64 | Src2ES, em_lseg),
+ I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg),
+ G(ByteOp, group11), G(0, group11),
+ /* 0xC8 - 0xCF */
+ I(Stack | SrcImmU16 | Src2ImmByte, em_enter), I(Stack, em_leave),
+ I(ImplicitOps | SrcImmU16, em_ret_far_imm),
+ I(ImplicitOps, em_ret_far),
+ D(ImplicitOps), DI(SrcImmByte, intn),
+ D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret),
+ /* 0xD0 - 0xD7 */
+ G(Src2One | ByteOp, group2), G(Src2One, group2),
+ G(Src2CL | ByteOp, group2), G(Src2CL, group2),
+ I(DstAcc | SrcImmUByte | No64, em_aam),
+ I(DstAcc | SrcImmUByte | No64, em_aad),
+ F(DstAcc | ByteOp | No64, em_salc),
+ I(DstAcc | SrcXLat | ByteOp, em_mov),
+ /* 0xD8 - 0xDF */
+ N, E(0, &escape_d9), N, E(0, &escape_db), N, E(0, &escape_dd), N, N,
+ /* 0xE0 - 0xE7 */
+ X3(I(SrcImmByte | NearBranch, em_loop)),
+ I(SrcImmByte | NearBranch, em_jcxz),
+ I2bvIP(SrcImmUByte | DstAcc, em_in, in, check_perm_in),
+ I2bvIP(SrcAcc | DstImmUByte, em_out, out, check_perm_out),
+ /* 0xE8 - 0xEF */
+ I(SrcImm | NearBranch, em_call), D(SrcImm | ImplicitOps | NearBranch),
+ I(SrcImmFAddr | No64, em_jmp_far),
+ D(SrcImmByte | ImplicitOps | NearBranch),
+ I2bvIP(SrcDX | DstAcc, em_in, in, check_perm_in),
+ I2bvIP(SrcAcc | DstDX, em_out, out, check_perm_out),
+ /* 0xF0 - 0xF7 */
+ N, DI(ImplicitOps, icebp), N, N,
+ DI(ImplicitOps | Priv, hlt), D(ImplicitOps),
+ G(ByteOp, group3), G(0, group3),
+ /* 0xF8 - 0xFF */
+ D(ImplicitOps), D(ImplicitOps),
+ I(ImplicitOps, em_cli), I(ImplicitOps, em_sti),
+ D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5),
+};
+
+static const struct opcode twobyte_table[256] = {
+ /* 0x00 - 0x0F */
+ G(0, group6), GD(0, &group7), N, N,
+ N, I(ImplicitOps | EmulateOnUD, em_syscall),
+ II(ImplicitOps | Priv, em_clts, clts), N,
+ DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N,
+ N, D(ImplicitOps | ModRM | SrcMem | NoAccess), N, N,
+ /* 0x10 - 0x1F */
+ N, N, N, N, N, N, N, N,
+ D(ImplicitOps | ModRM | SrcMem | NoAccess),
+ N, N, N, N, N, N, D(ImplicitOps | ModRM | SrcMem | NoAccess),
+ /* 0x20 - 0x2F */
+ DIP(ModRM | DstMem | Priv | Op3264 | NoMod, cr_read, check_cr_read),
+ DIP(ModRM | DstMem | Priv | Op3264 | NoMod, dr_read, check_dr_read),
+ IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_cr_write, cr_write,
+ check_cr_write),
+ IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_dr_write, dr_write,
+ check_dr_write),
+ N, N, N, N,
+ GP(ModRM | DstReg | SrcMem | Mov | Sse, &pfx_0f_28_0f_29),
+ GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_28_0f_29),
+ N, GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_2b),
+ N, N, N, N,
+ /* 0x30 - 0x3F */
+ II(ImplicitOps | Priv, em_wrmsr, wrmsr),
+ IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),
+ II(ImplicitOps | Priv, em_rdmsr, rdmsr),
+ IIP(ImplicitOps, em_rdpmc, rdpmc, check_rdpmc),
+ I(ImplicitOps | EmulateOnUD, em_sysenter),
+ I(ImplicitOps | Priv | EmulateOnUD, em_sysexit),
+ N, N,
+ N, N, N, N, N, N, N, N,
+ /* 0x40 - 0x4F */
+ X16(D(DstReg | SrcMem | ModRM)),
+ /* 0x50 - 0x5F */
+ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
+ /* 0x60 - 0x6F */
+ N, N, N, N,
+ N, N, N, N,
+ N, N, N, N,
+ N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f),
+ /* 0x70 - 0x7F */
+ N, N, N, N,
+ N, N, N, N,
+ N, N, N, N,
+ N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f),
+ /* 0x80 - 0x8F */
+ X16(D(SrcImm | NearBranch)),
+ /* 0x90 - 0x9F */
+ X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),
+ /* 0xA0 - 0xA7 */
+ I(Stack | Src2FS, em_push_sreg), I(Stack | Src2FS, em_pop_sreg),
+ II(ImplicitOps, em_cpuid, cpuid),
+ F(DstMem | SrcReg | ModRM | BitOp | NoWrite, em_bt),
+ F(DstMem | SrcReg | Src2ImmByte | ModRM, em_shld),
+ F(DstMem | SrcReg | Src2CL | ModRM, em_shld), N, N,
+ /* 0xA8 - 0xAF */
+ I(Stack | Src2GS, em_push_sreg), I(Stack | Src2GS, em_pop_sreg),
+ DI(ImplicitOps, rsm),
+ F(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_bts),
+ F(DstMem | SrcReg | Src2ImmByte | ModRM, em_shrd),
+ F(DstMem | SrcReg | Src2CL | ModRM, em_shrd),
+ GD(0, &group15), F(DstReg | SrcMem | ModRM, em_imul),
+ /* 0xB0 - 0xB7 */
+ I2bv(DstMem | SrcReg | ModRM | Lock | PageTable | SrcWrite, em_cmpxchg),
+ I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg),
+ F(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr),
+ I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg),
+ I(DstReg | SrcMemFAddr | ModRM | Src2GS, em_lseg),
+ D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
+ /* 0xB8 - 0xBF */
+ N, N,
+ G(BitOp, group8),
+ F(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc),
+ I(DstReg | SrcMem | ModRM, em_bsf_c),
+ I(DstReg | SrcMem | ModRM, em_bsr_c),
+ D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
+ /* 0xC0 - 0xC7 */
+ F2bv(DstMem | SrcReg | ModRM | SrcWrite | Lock, em_xadd),
+ N, ID(0, &instr_dual_0f_c3),
+ N, N, N, GD(0, &group9),
+ /* 0xC8 - 0xCF */
+ X8(I(DstReg, em_bswap)),
+ /* 0xD0 - 0xDF */
+ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
+ /* 0xE0 - 0xEF */
+ N, N, N, N, N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_e7),
+ N, N, N, N, N, N, N, N,
+ /* 0xF0 - 0xFF */
+ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N
+};
+
+static const struct instr_dual instr_dual_0f_38_f0 = {
+ I(DstReg | SrcMem | Mov, em_movbe), N
+};
+
+static const struct instr_dual instr_dual_0f_38_f1 = {
+ I(DstMem | SrcReg | Mov, em_movbe), N
+};
+
+static const struct gprefix three_byte_0f_38_f0 = {
+ ID(0, &instr_dual_0f_38_f0), N, N, N
+};
+
+static const struct gprefix three_byte_0f_38_f1 = {
+ ID(0, &instr_dual_0f_38_f1), N, N, N
+};
+
+/*
+ * Insns below are selected by the prefix which indexed by the third opcode
+ * byte.
+ */
+static const struct opcode opcode_map_0f_38[256] = {
+ /* 0x00 - 0x7f */
+ X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N),
+ /* 0x80 - 0xef */
+ X16(N), X16(N), X16(N), X16(N), X16(N), X16(N), X16(N),
+ /* 0xf0 - 0xf1 */
+ GP(EmulateOnUD | ModRM, &three_byte_0f_38_f0),
+ GP(EmulateOnUD | ModRM, &three_byte_0f_38_f1),
+ /* 0xf2 - 0xff */
+ N, N, X4(N), X8(N)
+};
+
+#undef D
+#undef N
+#undef G
+#undef GD
+#undef I
+#undef GP
+#undef EXT
+#undef MD
+#undef ID
+
+#undef D2bv
+#undef D2bvIP
+#undef I2bv
+#undef I2bvIP
+#undef I6ALU
+
+static unsigned imm_size(struct x86_emulate_ctxt *ctxt)
+{
+ unsigned size;
+
+ size = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
+ if (size == 8)
+ size = 4;
+ return size;
+}
+
+static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op,
+ unsigned size, bool sign_extension)
+{
+ int rc = X86EMUL_CONTINUE;
+
+ op->type = OP_IMM;
+ op->bytes = size;
+ op->addr.mem.ea = ctxt->_eip;
+ /* NB. Immediates are sign-extended as necessary. */
+ switch (op->bytes) {
+ case 1:
+ op->val = insn_fetch(s8, ctxt);
+ break;
+ case 2:
+ op->val = insn_fetch(s16, ctxt);
+ break;
+ case 4:
+ op->val = insn_fetch(s32, ctxt);
+ break;
+ case 8:
+ op->val = insn_fetch(s64, ctxt);
+ break;
+ }
+ if (!sign_extension) {
+ switch (op->bytes) {
+ case 1:
+ op->val &= 0xff;
+ break;
+ case 2:
+ op->val &= 0xffff;
+ break;
+ case 4:
+ op->val &= 0xffffffff;
+ break;
+ }
+ }
+done:
+ return rc;
+}
+
+static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
+ unsigned d)
+{
+ int rc = X86EMUL_CONTINUE;
+
+ switch (d) {
+ case OpReg:
+ decode_register_operand(ctxt, op);
+ break;
+ case OpImmUByte:
+ rc = decode_imm(ctxt, op, 1, false);
+ break;
+ case OpMem:
+ ctxt->memop.bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
+ mem_common:
+ *op = ctxt->memop;
+ ctxt->memopp = op;
+ if (ctxt->d & BitOp)
+ fetch_bit_operand(ctxt);
+ op->orig_val = op->val;
+ break;
+ case OpMem64:
+ ctxt->memop.bytes = (ctxt->op_bytes == 8) ? 16 : 8;
+ goto mem_common;
+ case OpAcc:
+ op->type = OP_REG;
+ op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
+ op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
+ fetch_register_operand(op);
+ op->orig_val = op->val;
+ break;
+ case OpAccLo:
+ op->type = OP_REG;
+ op->bytes = (ctxt->d & ByteOp) ? 2 : ctxt->op_bytes;
+ op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
+ fetch_register_operand(op);
+ op->orig_val = op->val;
+ break;
+ case OpAccHi:
+ if (ctxt->d & ByteOp) {
+ op->type = OP_NONE;
+ break;
+ }
+ op->type = OP_REG;
+ op->bytes = ctxt->op_bytes;
+ op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
+ fetch_register_operand(op);
+ op->orig_val = op->val;
+ break;
+ case OpDI:
+ op->type = OP_MEM;
+ op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
+ op->addr.mem.ea =
+ register_address(ctxt, VCPU_REGS_RDI);
+ op->addr.mem.seg = VCPU_SREG_ES;
+ op->val = 0;
+ op->count = 1;
+ break;
+ case OpDX:
+ op->type = OP_REG;
+ op->bytes = 2;
+ op->addr.reg = reg_rmw(ctxt, VCPU_REGS_RDX);
+ fetch_register_operand(op);
+ break;
+ case OpCL:
+ op->type = OP_IMM;
+ op->bytes = 1;
+ op->val = reg_read(ctxt, VCPU_REGS_RCX) & 0xff;
+ break;
+ case OpImmByte:
+ rc = decode_imm(ctxt, op, 1, true);
+ break;
+ case OpOne:
+ op->type = OP_IMM;
+ op->bytes = 1;
+ op->val = 1;
+ break;
+ case OpImm:
+ rc = decode_imm(ctxt, op, imm_size(ctxt), true);
+ break;
+ case OpImm64:
+ rc = decode_imm(ctxt, op, ctxt->op_bytes, true);
+ break;
+ case OpMem8:
+ ctxt->memop.bytes = 1;
+ if (ctxt->memop.type == OP_REG) {
+ ctxt->memop.addr.reg = decode_register(ctxt,
+ ctxt->modrm_rm, true);
+ fetch_register_operand(&ctxt->memop);
+ }
+ goto mem_common;
+ 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, VCPU_REGS_RSI);
+ op->addr.mem.seg = ctxt->seg_override;
+ op->val = 0;
+ op->count = 1;
+ break;
+ case OpXLat:
+ op->type = OP_MEM;
+ op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
+ op->addr.mem.ea =
+ address_mask(ctxt,
+ reg_read(ctxt, VCPU_REGS_RBX) +
+ (reg_read(ctxt, VCPU_REGS_RAX) & 0xff));
+ op->addr.mem.seg = ctxt->seg_override;
+ 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 OpES:
+ op->type = OP_IMM;
+ op->val = VCPU_SREG_ES;
+ break;
+ case OpCS:
+ op->type = OP_IMM;
+ op->val = VCPU_SREG_CS;
+ break;
+ case OpSS:
+ op->type = OP_IMM;
+ op->val = VCPU_SREG_SS;
+ break;
+ case OpDS:
+ op->type = OP_IMM;
+ op->val = VCPU_SREG_DS;
+ break;
+ case OpFS:
+ op->type = OP_IMM;
+ op->val = VCPU_SREG_FS;
+ break;
+ case OpGS:
+ op->type = OP_IMM;
+ op->val = VCPU_SREG_GS;
+ break;
+ case OpImplicit:
+ /* Special instructions do their own operand decoding. */
+ default:
+ op->type = OP_NONE; /* Disable writeback. */
+ break;
+ }
+
+done:
+ return rc;
+}
+
+int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
+{
+ int rc = X86EMUL_CONTINUE;
+ int mode = ctxt->mode;
+ int def_op_bytes, def_ad_bytes, goffset, simd_prefix;
+ bool op_prefix = false;
+ bool has_seg_override = false;
+ struct opcode opcode;
+
+ ctxt->memop.type = OP_NONE;
+ ctxt->memopp = NULL;
+ ctxt->_eip = ctxt->eip;
+ ctxt->fetch.ptr = ctxt->fetch.data;
+ ctxt->fetch.end = ctxt->fetch.data + insn_len;
+ ctxt->opcode_len = 1;
+ if (insn_len > 0)
+ memcpy(ctxt->fetch.data, insn, insn_len);
+ else {
+ rc = __do_insn_fetch_bytes(ctxt, 1);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+ }
+
+ switch (mode) {
+ case X86EMUL_MODE_REAL:
+ case X86EMUL_MODE_VM86:
+ case X86EMUL_MODE_PROT16:
+ def_op_bytes = def_ad_bytes = 2;
+ break;
+ case X86EMUL_MODE_PROT32:
+ def_op_bytes = def_ad_bytes = 4;
+ break;
+#ifdef CONFIG_X86_64
+ case X86EMUL_MODE_PROT64:
+ def_op_bytes = 4;
+ def_ad_bytes = 8;
+ break;
+#endif
+ default:
+ return EMULATION_FAILED;
+ }
+
+ ctxt->op_bytes = def_op_bytes;
+ ctxt->ad_bytes = def_ad_bytes;
+
+ /* Legacy prefixes. */
+ for (;;) {
+ switch (ctxt->b = insn_fetch(u8, ctxt)) {
+ case 0x66: /* operand-size override */
+ op_prefix = true;
+ /* switch between 2/4 bytes */
+ ctxt->op_bytes = def_op_bytes ^ 6;
+ break;
+ case 0x67: /* address-size override */
+ if (mode == X86EMUL_MODE_PROT64)
+ /* switch between 4/8 bytes */
+ ctxt->ad_bytes = def_ad_bytes ^ 12;
+ else
+ /* switch between 2/4 bytes */
+ ctxt->ad_bytes = def_ad_bytes ^ 6;
+ break;
+ case 0x26: /* ES override */
+ case 0x2e: /* CS override */
+ case 0x36: /* SS override */
+ case 0x3e: /* DS override */
+ has_seg_override = true;
+ ctxt->seg_override = (ctxt->b >> 3) & 3;
+ break;
+ case 0x64: /* FS override */
+ case 0x65: /* GS override */
+ has_seg_override = true;
+ ctxt->seg_override = ctxt->b & 7;
+ break;
+ case 0x40 ... 0x4f: /* REX */
+ if (mode != X86EMUL_MODE_PROT64)
+ goto done_prefixes;
+ ctxt->rex_prefix = ctxt->b;
+ continue;
+ case 0xf0: /* LOCK */
+ ctxt->lock_prefix = 1;
+ break;
+ case 0xf2: /* REPNE/REPNZ */
+ case 0xf3: /* REP/REPE/REPZ */
+ ctxt->rep_prefix = ctxt->b;
+ break;
+ default:
+ goto done_prefixes;
+ }
+
+ /* Any legacy prefix after a REX prefix nullifies its effect. */
+
+ ctxt->rex_prefix = 0;
+ }
+
+done_prefixes:
+
+ /* REX prefix. */
+ if (ctxt->rex_prefix & 8)
+ ctxt->op_bytes = 8; /* REX.W */
+
+ /* Opcode byte(s). */
+ opcode = opcode_table[ctxt->b];
+ /* Two-byte opcode? */
+ if (ctxt->b == 0x0f) {
+ ctxt->opcode_len = 2;
+ ctxt->b = insn_fetch(u8, ctxt);
+ opcode = twobyte_table[ctxt->b];
+
+ /* 0F_38 opcode map */
+ if (ctxt->b == 0x38) {
+ ctxt->opcode_len = 3;
+ ctxt->b = insn_fetch(u8, ctxt);
+ opcode = opcode_map_0f_38[ctxt->b];
+ }
+ }
+ ctxt->d = opcode.flags;
+
+ if (ctxt->d & ModRM)
+ ctxt->modrm = insn_fetch(u8, ctxt);
+
+ /* vex-prefix instructions are not implemented */
+ if (ctxt->opcode_len == 1 && (ctxt->b == 0xc5 || ctxt->b == 0xc4) &&
+ (mode == X86EMUL_MODE_PROT64 || (ctxt->modrm & 0xc0) == 0xc0)) {
+ ctxt->d = NotImpl;
+ }
+
+ while (ctxt->d & GroupMask) {
+ switch (ctxt->d & GroupMask) {
+ case Group:
+ goffset = (ctxt->modrm >> 3) & 7;
+ opcode = opcode.u.group[goffset];
+ break;
+ case GroupDual:
+ goffset = (ctxt->modrm >> 3) & 7;
+ if ((ctxt->modrm >> 6) == 3)
+ opcode = opcode.u.gdual->mod3[goffset];
+ else
+ opcode = opcode.u.gdual->mod012[goffset];
+ break;
+ case RMExt:
+ goffset = ctxt->modrm & 7;
+ opcode = opcode.u.group[goffset];
+ break;
+ case Prefix:
+ if (ctxt->rep_prefix && op_prefix)
+ return EMULATION_FAILED;
+ simd_prefix = op_prefix ? 0x66 : ctxt->rep_prefix;
+ switch (simd_prefix) {
+ case 0x00: opcode = opcode.u.gprefix->pfx_no; break;
+ case 0x66: opcode = opcode.u.gprefix->pfx_66; break;
+ case 0xf2: opcode = opcode.u.gprefix->pfx_f2; break;
+ case 0xf3: opcode = opcode.u.gprefix->pfx_f3; break;
+ }
+ break;
+ case Escape:
+ if (ctxt->modrm > 0xbf)
+ opcode = opcode.u.esc->high[ctxt->modrm - 0xc0];
+ else
+ opcode = opcode.u.esc->op[(ctxt->modrm >> 3) & 7];
+ break;
+ case InstrDual:
+ if ((ctxt->modrm >> 6) == 3)
+ opcode = opcode.u.idual->mod3;
+ else
+ opcode = opcode.u.idual->mod012;
+ break;
+ case ModeDual:
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ opcode = opcode.u.mdual->mode64;
+ else
+ opcode = opcode.u.mdual->mode32;
+ break;
+ default:
+ return EMULATION_FAILED;
+ }
+
+ ctxt->d &= ~(u64)GroupMask;
+ ctxt->d |= opcode.flags;
+ }
+
+ /* Unrecognised? */
+ if (ctxt->d == 0)
+ return EMULATION_FAILED;
+
+ ctxt->execute = opcode.u.execute;
+
+ if (unlikely(ctxt->ud) && likely(!(ctxt->d & EmulateOnUD)))
+ return EMULATION_FAILED;
+
+ if (unlikely(ctxt->d &
+ (NotImpl|Stack|Op3264|Sse|Mmx|Intercept|CheckPerm|NearBranch|
+ No16))) {
+ /*
+ * These are copied unconditionally here, and checked unconditionally
+ * in x86_emulate_insn.
+ */
+ ctxt->check_perm = opcode.check_perm;
+ ctxt->intercept = opcode.intercept;
+
+ if (ctxt->d & NotImpl)
+ return EMULATION_FAILED;
+
+ if (mode == X86EMUL_MODE_PROT64) {
+ if (ctxt->op_bytes == 4 && (ctxt->d & Stack))
+ ctxt->op_bytes = 8;
+ else if (ctxt->d & NearBranch)
+ ctxt->op_bytes = 8;
+ }
+
+ if (ctxt->d & Op3264) {
+ if (mode == X86EMUL_MODE_PROT64)
+ ctxt->op_bytes = 8;
+ else
+ ctxt->op_bytes = 4;
+ }
+
+ if ((ctxt->d & No16) && ctxt->op_bytes == 2)
+ ctxt->op_bytes = 4;
+
+ if (ctxt->d & Sse)
+ ctxt->op_bytes = 16;
+ else if (ctxt->d & Mmx)
+ ctxt->op_bytes = 8;
+ }
+
+ /* ModRM and SIB bytes. */
+ if (ctxt->d & ModRM) {
+ rc = decode_modrm(ctxt, &ctxt->memop);
+ if (!has_seg_override) {
+ has_seg_override = true;
+ ctxt->seg_override = ctxt->modrm_seg;
+ }
+ } else if (ctxt->d & MemAbs)
+ rc = decode_abs(ctxt, &ctxt->memop);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+
+ if (!has_seg_override)
+ ctxt->seg_override = VCPU_SREG_DS;
+
+ ctxt->memop.addr.mem.seg = ctxt->seg_override;
+
+ /*
+ * Decode and fetch the source operand: register, memory
+ * or immediate.
+ */
+ rc = decode_operand(ctxt, &ctxt->src, (ctxt->d >> SrcShift) & OpMask);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+
+ /*
+ * Decode and fetch the second source operand: register, memory
+ * or immediate.
+ */
+ rc = decode_operand(ctxt, &ctxt->src2, (ctxt->d >> Src2Shift) & OpMask);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+
+ /* Decode and fetch the destination operand: register or memory. */
+ rc = decode_operand(ctxt, &ctxt->dst, (ctxt->d >> DstShift) & OpMask);
+
+ if (ctxt->rip_relative)
+ ctxt->memopp->addr.mem.ea = address_mask(ctxt,
+ ctxt->memopp->addr.mem.ea + ctxt->_eip);
+
+done:
+ return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK;
+}
+
+bool x86_page_table_writing_insn(struct x86_emulate_ctxt *ctxt)
+{
+ return ctxt->d & PageTable;
+}
+
+static bool string_insn_completed(struct x86_emulate_ctxt *ctxt)
+{
+ /* The second termination condition only applies for REPE
+ * and REPNE. Test if the repeat string operation prefix is
+ * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
+ * corresponding termination condition according to:
+ * - if REPE/REPZ and ZF = 0 then done
+ * - if REPNE/REPNZ and ZF = 1 then done
+ */
+ if (((ctxt->b == 0xa6) || (ctxt->b == 0xa7) ||
+ (ctxt->b == 0xae) || (ctxt->b == 0xaf))
+ && (((ctxt->rep_prefix == REPE_PREFIX) &&
+ ((ctxt->eflags & X86_EFLAGS_ZF) == 0))
+ || ((ctxt->rep_prefix == REPNE_PREFIX) &&
+ ((ctxt->eflags & X86_EFLAGS_ZF) == X86_EFLAGS_ZF))))
+ return true;
+
+ return false;
+}
+
+static int flush_pending_x87_faults(struct x86_emulate_ctxt *ctxt)
+{
+ bool fault = false;
+
+ ctxt->ops->get_fpu(ctxt);
+ asm volatile("1: fwait \n\t"
+ "2: \n\t"
+ ".pushsection .fixup,\"ax\" \n\t"
+ "3: \n\t"
+ "movb $1, %[fault] \n\t"
+ "jmp 2b \n\t"
+ ".popsection \n\t"
+ _ASM_EXTABLE(1b, 3b)
+ : [fault]"+qm"(fault));
+ ctxt->ops->put_fpu(ctxt);
+
+ if (unlikely(fault))
+ return emulate_exception(ctxt, MF_VECTOR, 0, false);
+
+ return X86EMUL_CONTINUE;
+}
+
+static void fetch_possible_mmx_operand(struct x86_emulate_ctxt *ctxt,
+ struct operand *op)
+{
+ if (op->type == OP_MM)
+ read_mmx_reg(ctxt, &op->mm_val, op->addr.mm);
+}
+
+static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *))
+{
+ ulong flags = (ctxt->eflags & EFLAGS_MASK) | X86_EFLAGS_IF;
+ if (!(ctxt->d & ByteOp))
+ fop += __ffs(ctxt->dst.bytes) * FASTOP_SIZE;
+ asm("push %[flags]; popf; call *%[fastop]; pushf; pop %[flags]\n"
+ : "+a"(ctxt->dst.val), "+d"(ctxt->src.val), [flags]"+D"(flags),
+ [fastop]"+S"(fop)
+ : "c"(ctxt->src2.val));
+ ctxt->eflags = (ctxt->eflags & ~EFLAGS_MASK) | (flags & EFLAGS_MASK);
+ if (!fop) /* exception is returned in fop variable */
+ return emulate_de(ctxt);
+ return X86EMUL_CONTINUE;
+}
+
+void init_decode_cache(struct x86_emulate_ctxt *ctxt)
+{
+ memset(&ctxt->rip_relative, 0,
+ (void *)&ctxt->modrm - (void *)&ctxt->rip_relative);
+
+ ctxt->io_read.pos = 0;
+ ctxt->io_read.end = 0;
+ ctxt->mem_read.end = 0;
+}
+
+int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
+{
+ const struct x86_emulate_ops *ops = ctxt->ops;
+ int rc = X86EMUL_CONTINUE;
+ int saved_dst_type = ctxt->dst.type;
+
+ ctxt->mem_read.pos = 0;
+
+ /* LOCK prefix is allowed only with some instructions */
+ if (ctxt->lock_prefix && (!(ctxt->d & Lock) || ctxt->dst.type != OP_MEM)) {
+ rc = emulate_ud(ctxt);
+ goto done;
+ }
+
+ if ((ctxt->d & SrcMask) == SrcMemFAddr && ctxt->src.type != OP_MEM) {
+ rc = emulate_ud(ctxt);
+ goto done;
+ }
+
+ if (unlikely(ctxt->d &
+ (No64|Undefined|Sse|Mmx|Intercept|CheckPerm|Priv|Prot|String))) {
+ if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) ||
+ (ctxt->d & Undefined)) {
+ rc = emulate_ud(ctxt);
+ goto done;
+ }
+
+ if (((ctxt->d & (Sse|Mmx)) && ((ops->get_cr(ctxt, 0) & X86_CR0_EM)))
+ || ((ctxt->d & Sse) && !(ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))) {
+ rc = emulate_ud(ctxt);
+ goto done;
+ }
+
+ if ((ctxt->d & (Sse|Mmx)) && (ops->get_cr(ctxt, 0) & X86_CR0_TS)) {
+ rc = emulate_nm(ctxt);
+ goto done;
+ }
+
+ if (ctxt->d & Mmx) {
+ rc = flush_pending_x87_faults(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ /*
+ * Now that we know the fpu is exception safe, we can fetch
+ * operands from it.
+ */
+ fetch_possible_mmx_operand(ctxt, &ctxt->src);
+ fetch_possible_mmx_operand(ctxt, &ctxt->src2);
+ if (!(ctxt->d & Mov))
+ fetch_possible_mmx_operand(ctxt, &ctxt->dst);
+ }
+
+ if (unlikely(ctxt->guest_mode) && (ctxt->d & Intercept)) {
+ rc = emulator_check_intercept(ctxt, ctxt->intercept,
+ X86_ICPT_PRE_EXCEPT);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ }
+
+ /* Instruction can only be executed in protected mode */
+ if ((ctxt->d & Prot) && ctxt->mode < X86EMUL_MODE_PROT16) {
+ rc = emulate_ud(ctxt);
+ goto done;
+ }
+
+ /* Privileged instruction can be executed only in CPL=0 */
+ if ((ctxt->d & Priv) && ops->cpl(ctxt)) {
+ if (ctxt->d & PrivUD)
+ rc = emulate_ud(ctxt);
+ else
+ rc = emulate_gp(ctxt, 0);
+ goto done;
+ }
+
+ /* Do instruction specific permission checks */
+ if (ctxt->d & CheckPerm) {
+ rc = ctxt->check_perm(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ }
+
+ if (unlikely(ctxt->guest_mode) && (ctxt->d & Intercept)) {
+ rc = emulator_check_intercept(ctxt, ctxt->intercept,
+ X86_ICPT_POST_EXCEPT);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ }
+
+ if (ctxt->rep_prefix && (ctxt->d & String)) {
+ /* All REP prefixes have the same first termination condition */
+ if (address_mask(ctxt, reg_read(ctxt, VCPU_REGS_RCX)) == 0) {
+ ctxt->eip = ctxt->_eip;
+ ctxt->eflags &= ~X86_EFLAGS_RF;
+ goto done;
+ }
+ }
+ }
+
+ if ((ctxt->src.type == OP_MEM) && !(ctxt->d & NoAccess)) {
+ rc = segmented_read(ctxt, ctxt->src.addr.mem,
+ ctxt->src.valptr, ctxt->src.bytes);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ ctxt->src.orig_val64 = ctxt->src.val64;
+ }
+
+ if (ctxt->src2.type == OP_MEM) {
+ rc = segmented_read(ctxt, ctxt->src2.addr.mem,
+ &ctxt->src2.val, ctxt->src2.bytes);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ }
+
+ if ((ctxt->d & DstMask) == ImplicitOps)
+ goto special_insn;
+
+
+ if ((ctxt->dst.type == OP_MEM) && !(ctxt->d & Mov)) {
+ /* optimisation - avoid slow emulated read if Mov */
+ rc = segmented_read(ctxt, ctxt->dst.addr.mem,
+ &ctxt->dst.val, ctxt->dst.bytes);
+ if (rc != X86EMUL_CONTINUE) {
+ if (!(ctxt->d & NoWrite) &&
+ rc == X86EMUL_PROPAGATE_FAULT &&
+ ctxt->exception.vector == PF_VECTOR)
+ ctxt->exception.error_code |= PFERR_WRITE_MASK;
+ goto done;
+ }
+ }
+ /* Copy full 64-bit value for CMPXCHG8B. */
+ ctxt->dst.orig_val64 = ctxt->dst.val64;
+
+special_insn:
+
+ if (unlikely(ctxt->guest_mode) && (ctxt->d & Intercept)) {
+ rc = emulator_check_intercept(ctxt, ctxt->intercept,
+ X86_ICPT_POST_MEMACCESS);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ }
+
+ if (ctxt->rep_prefix && (ctxt->d & String))
+ ctxt->eflags |= X86_EFLAGS_RF;
+ else
+ ctxt->eflags &= ~X86_EFLAGS_RF;
+
+ if (ctxt->execute) {
+ if (ctxt->d & Fastop) {
+ void (*fop)(struct fastop *) = (void *)ctxt->execute;
+ rc = fastop(ctxt, fop);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ goto writeback;
+ }
+ rc = ctxt->execute(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ goto writeback;
+ }
+
+ if (ctxt->opcode_len == 2)
+ goto twobyte_insn;
+ else if (ctxt->opcode_len == 3)
+ goto threebyte_insn;
+
+ switch (ctxt->b) {
+ case 0x70 ... 0x7f: /* jcc (short) */
+ if (test_cc(ctxt->b, ctxt->eflags))
+ rc = jmp_rel(ctxt, ctxt->src.val);
+ break;
+ case 0x8d: /* lea r16/r32, m */
+ ctxt->dst.val = ctxt->src.addr.mem.ea;
+ break;
+ case 0x90 ... 0x97: /* nop / xchg reg, rax */
+ if (ctxt->dst.addr.reg == reg_rmw(ctxt, VCPU_REGS_RAX))
+ ctxt->dst.type = OP_NONE;
+ else
+ rc = em_xchg(ctxt);
+ break;
+ case 0x98: /* cbw/cwde/cdqe */
+ switch (ctxt->op_bytes) {
+ case 2: ctxt->dst.val = (s8)ctxt->dst.val; break;
+ case 4: ctxt->dst.val = (s16)ctxt->dst.val; break;
+ case 8: ctxt->dst.val = (s32)ctxt->dst.val; break;
+ }
+ break;
+ case 0xcc: /* int3 */
+ rc = emulate_int(ctxt, 3);
+ break;
+ case 0xcd: /* int n */
+ rc = emulate_int(ctxt, ctxt->src.val);
+ break;
+ case 0xce: /* into */
+ if (ctxt->eflags & X86_EFLAGS_OF)
+ rc = emulate_int(ctxt, 4);
+ break;
+ case 0xe9: /* jmp rel */
+ case 0xeb: /* jmp rel short */
+ rc = jmp_rel(ctxt, ctxt->src.val);
+ ctxt->dst.type = OP_NONE; /* Disable writeback. */
+ break;
+ case 0xf4: /* hlt */
+ ctxt->ops->halt(ctxt);
+ break;
+ case 0xf5: /* cmc */
+ /* complement carry flag from eflags reg */
+ ctxt->eflags ^= X86_EFLAGS_CF;
+ break;
+ case 0xf8: /* clc */
+ ctxt->eflags &= ~X86_EFLAGS_CF;
+ break;
+ case 0xf9: /* stc */
+ ctxt->eflags |= X86_EFLAGS_CF;
+ break;
+ case 0xfc: /* cld */
+ ctxt->eflags &= ~X86_EFLAGS_DF;
+ break;
+ case 0xfd: /* std */
+ ctxt->eflags |= X86_EFLAGS_DF;
+ break;
+ default:
+ goto cannot_emulate;
+ }
+
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+
+writeback:
+ if (ctxt->d & SrcWrite) {
+ BUG_ON(ctxt->src.type == OP_MEM || ctxt->src.type == OP_MEM_STR);
+ rc = writeback(ctxt, &ctxt->src);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ }
+ if (!(ctxt->d & NoWrite)) {
+ rc = writeback(ctxt, &ctxt->dst);
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+ }
+
+ /*
+ * restore dst type in case the decoding will be reused
+ * (happens for string instruction )
+ */
+ ctxt->dst.type = saved_dst_type;
+
+ if ((ctxt->d & SrcMask) == SrcSI)
+ string_addr_inc(ctxt, VCPU_REGS_RSI, &ctxt->src);
+
+ if ((ctxt->d & DstMask) == DstDI)
+ string_addr_inc(ctxt, VCPU_REGS_RDI, &ctxt->dst);
+
+ if (ctxt->rep_prefix && (ctxt->d & String)) {
+ unsigned int count;
+ struct read_cache *r = &ctxt->io_read;
+ if ((ctxt->d & SrcMask) == SrcSI)
+ count = ctxt->src.count;
+ else
+ count = ctxt->dst.count;
+ register_address_increment(ctxt, VCPU_REGS_RCX, -count);
+
+ if (!string_insn_completed(ctxt)) {
+ /*
+ * Re-enter guest when pio read ahead buffer is empty
+ * or, if it is not used, after each 1024 iteration.
+ */
+ if ((r->end != 0 || reg_read(ctxt, VCPU_REGS_RCX) & 0x3ff) &&
+ (r->end == 0 || r->end != r->pos)) {
+ /*
+ * Reset read cache. Usually happens before
+ * decode, but since instruction is restarted
+ * we have to do it here.
+ */
+ ctxt->mem_read.end = 0;
+ writeback_registers(ctxt);
+ return EMULATION_RESTART;
+ }
+ goto done; /* skip rip writeback */
+ }
+ ctxt->eflags &= ~X86_EFLAGS_RF;
+ }
+
+ ctxt->eip = ctxt->_eip;
+
+done:
+ if (rc == X86EMUL_PROPAGATE_FAULT) {
+ WARN_ON(ctxt->exception.vector > 0x1f);
+ ctxt->have_exception = true;
+ }
+ if (rc == X86EMUL_INTERCEPTED)
+ return EMULATION_INTERCEPTED;
+
+ if (rc == X86EMUL_CONTINUE)
+ writeback_registers(ctxt);
+
+ return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
+
+twobyte_insn:
+ switch (ctxt->b) {
+ case 0x09: /* wbinvd */
+ (ctxt->ops->wbinvd)(ctxt);
+ break;
+ case 0x08: /* invd */
+ case 0x0d: /* GrpP (prefetch) */
+ case 0x18: /* Grp16 (prefetch/nop) */
+ case 0x1f: /* nop */
+ break;
+ case 0x20: /* mov cr, reg */
+ ctxt->dst.val = ops->get_cr(ctxt, ctxt->modrm_reg);
+ break;
+ case 0x21: /* mov from dr to reg */
+ ops->get_dr(ctxt, ctxt->modrm_reg, &ctxt->dst.val);
+ break;
+ case 0x40 ... 0x4f: /* cmov */
+ if (test_cc(ctxt->b, ctxt->eflags))
+ ctxt->dst.val = ctxt->src.val;
+ else if (ctxt->op_bytes != 4)
+ ctxt->dst.type = OP_NONE; /* no writeback */
+ break;
+ case 0x80 ... 0x8f: /* jnz rel, etc*/
+ if (test_cc(ctxt->b, ctxt->eflags))
+ rc = jmp_rel(ctxt, ctxt->src.val);
+ break;
+ case 0x90 ... 0x9f: /* setcc r/m8 */
+ ctxt->dst.val = test_cc(ctxt->b, ctxt->eflags);
+ break;
+ case 0xb6 ... 0xb7: /* movzx */
+ ctxt->dst.bytes = ctxt->op_bytes;
+ ctxt->dst.val = (ctxt->src.bytes == 1) ? (u8) ctxt->src.val
+ : (u16) ctxt->src.val;
+ break;
+ case 0xbe ... 0xbf: /* movsx */
+ ctxt->dst.bytes = ctxt->op_bytes;
+ ctxt->dst.val = (ctxt->src.bytes == 1) ? (s8) ctxt->src.val :
+ (s16) ctxt->src.val;
+ break;
+ default:
+ goto cannot_emulate;
+ }
+
+threebyte_insn:
+
+ if (rc != X86EMUL_CONTINUE)
+ goto done;
+
+ goto writeback;
+
+cannot_emulate:
+ return EMULATION_FAILED;
+}
+
+void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt)
+{
+ invalidate_registers(ctxt);
+}
+
+void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt)
+{
+ writeback_registers(ctxt);
+}
Code Review / kvmfornfv.git / blobdiff