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linux-zen-server/arch/x86/kvm/emulate.c

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2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/******************************************************************************
* 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>
*
* From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kvm_host.h>
#include "kvm_cache_regs.h"
#include "kvm_emulate.h"
#include <linux/stringify.h>
#include <asm/debugreg.h>
#include <asm/nospec-branch.h>
#include <asm/ibt.h>
#include "x86.h"
#include "tss.h"
#include "mmu.h"
#include "pmu.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 AlignMask ((u64)7 << 41)
#define Aligned ((u64)1 << 41) /* Explicitly aligned (e.g. MOVDQA) */
#define Unaligned ((u64)2 << 41) /* Explicitly unaligned (e.g. MOVDQU) */
#define Avx ((u64)3 << 41) /* Advanced Vector Extensions */
#define Aligned16 ((u64)4 << 41) /* Aligned to 16 byte boundary (e.g. FXSAVE) */
#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 TwoMemOp ((u64)1 << 55) /* Instruction has two memory operand */
#define IsBranch ((u64)1 << 56) /* Instruction is considered a branch. */
#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)
struct opcode {
u64 flags;
u8 intercept;
u8 pad[7];
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 void writeback_registers(struct x86_emulate_ctxt *ctxt)
{
unsigned long dirty = ctxt->regs_dirty;
unsigned reg;
for_each_set_bit(reg, &dirty, NR_EMULATOR_GPRS)
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
/*
* 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).
*
* The 16 byte alignment, considering 5 bytes for the RET thunk, 3 for ENDBR
* and 1 for the straight line speculation INT3, leaves 7 bytes for the
* body of the function. Currently none is larger than 4.
*/
static int fastop(struct x86_emulate_ctxt *ctxt, fastop_t fop);
#define FASTOP_SIZE 16
#define __FOP_FUNC(name) \
".align " __stringify(FASTOP_SIZE) " \n\t" \
".type " name ", @function \n\t" \
name ":\n\t" \
ASM_ENDBR \
IBT_NOSEAL(name)
#define FOP_FUNC(name) \
__FOP_FUNC(#name)
#define __FOP_RET(name) \
"11: " ASM_RET \
".size " name ", .-" name "\n\t"
#define FOP_RET(name) \
__FOP_RET(#name)
#define __FOP_START(op, align) \
extern void em_##op(struct fastop *fake); \
asm(".pushsection .text, \"ax\" \n\t" \
".global em_" #op " \n\t" \
".align " __stringify(align) " \n\t" \
"em_" #op ":\n\t"
#define FOP_START(op) __FOP_START(op, FASTOP_SIZE)
#define FOP_END \
".popsection")
#define __FOPNOP(name) \
__FOP_FUNC(name) \
__FOP_RET(name)
#define FOPNOP() \
__FOPNOP(__stringify(__UNIQUE_ID(nop)))
#define FOP1E(op, dst) \
__FOP_FUNC(#op "_" #dst) \
"10: " #op " %" #dst " \n\t" \
__FOP_RET(#op "_" #dst)
#define FOP1EEX(op, dst) \
FOP1E(op, dst) _ASM_EXTABLE_TYPE_REG(10b, 11b, EX_TYPE_ZERO_REG, %%esi)
#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_FUNC(#op "_" #dst "_" #src) \
#op " %" #src ", %" #dst " \n\t" \
__FOP_RET(#op "_" #dst "_" #src)
#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_FUNC(#op "_" #dst "_" #src "_" #src2) \
#op " %" #src2 ", %" #src ", %" #dst " \n\t"\
__FOP_RET(#op "_" #dst "_" #src "_" #src2)
/* 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) \
FOP_FUNC(op) \
#op " %al \n\t" \
FOP_RET(op)
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)
FOP_FUNC(salc)
"pushf; sbb %al, %al; popf \n\t"
FOP_RET(salc)
FOP_END;
/*
* XXX: inoutclob user must know where the argument is being expanded.
* Using asm goto would allow us to remove _fault.
*/
#define asm_safe(insn, inoutclob...) \
({ \
int _fault = 0; \
\
asm volatile("1:" insn "\n" \
"2:\n" \
_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_ONE_REG, %[_fault]) \
: [_fault] "+r"(_fault) inoutclob ); \
\
_fault ? X86EMUL_UNHANDLEABLE : X86EMUL_CONTINUE; \
})
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 *preg = reg_rmw(ctxt, reg);
assign_register(preg, *preg + inc, ctxt->ad_bytes);
}
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)
{
if (KVM_EMULATOR_BUG_ON(vec > 0x1f, ctxt))
return X86EMUL_UNHANDLEABLE;
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);
}
static inline u8 ctxt_virt_addr_bits(struct x86_emulate_ctxt *ctxt)
{
return (ctxt->ops->get_cr(ctxt, 4) & X86_CR4_LA57) ? 57 : 48;
}
static inline bool emul_is_noncanonical_address(u64 la,
struct x86_emulate_ctxt *ctxt)
{
return !__is_canonical_address(la, ctxt_virt_addr_bits(ctxt));
}
/*
* 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. FXSAVE and FXRSTOR are checked here too as their
* 512 bytes of data must be aligned to a 16 byte boundary.
*/
static unsigned insn_alignment(struct x86_emulate_ctxt *ctxt, unsigned size)
{
u64 alignment = ctxt->d & AlignMask;
if (likely(size < 16))
return 1;
switch (alignment) {
case Unaligned:
case Avx:
return 1;
case Aligned16:
return 16;
case Aligned:
default:
return size;
}
}
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;
u8 va_bits;
la = seg_base(ctxt, addr.seg) + addr.ea;
*max_size = 0;
switch (mode) {
case X86EMUL_MODE_PROT64:
*linear = la;
va_bits = ctxt_virt_addr_bits(ctxt);
if (!__is_canonical_address(la, va_bits))
goto bad;
*max_size = min_t(u64, ~0u, (1ull << va_bits) - la);
if (size > *max_size)
goto bad;
break;
default:
*linear = la = (u32)la;
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;
}
break;
}
if (la & (insn_alignment(ctxt, size) - 1))
return emulate_gp(ctxt, 0);
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)
{
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, ctxt->mode, &linear);
if (rc == X86EMUL_CONTINUE)
ctxt->_eip = addr.ea;
return rc;
}
static inline int emulator_recalc_and_set_mode(struct x86_emulate_ctxt *ctxt)
{
u64 efer;
struct desc_struct cs;
u16 selector;
u32 base3;
ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
if (!(ctxt->ops->get_cr(ctxt, 0) & X86_CR0_PE)) {
/* Real mode. cpu must not have long mode active */
if (efer & EFER_LMA)
return X86EMUL_UNHANDLEABLE;
ctxt->mode = X86EMUL_MODE_REAL;
return X86EMUL_CONTINUE;
}
if (ctxt->eflags & X86_EFLAGS_VM) {
/* Protected/VM86 mode. cpu must not have long mode active */
if (efer & EFER_LMA)
return X86EMUL_UNHANDLEABLE;
ctxt->mode = X86EMUL_MODE_VM86;
return X86EMUL_CONTINUE;
}
if (!ctxt->ops->get_segment(ctxt, &selector, &cs, &base3, VCPU_SREG_CS))
return X86EMUL_UNHANDLEABLE;
if (efer & EFER_LMA) {
if (cs.l) {
/* Proper long mode */
ctxt->mode = X86EMUL_MODE_PROT64;
} else if (cs.d) {
/* 32 bit compatibility mode*/
ctxt->mode = X86EMUL_MODE_PROT32;
} else {
ctxt->mode = X86EMUL_MODE_PROT16;
}
} else {
/* Legacy 32 bit / 16 bit mode */
ctxt->mode = cs.d ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
}
return X86EMUL_CONTINUE;
}
static inline int assign_eip_near(struct x86_emulate_ctxt *ctxt, ulong dst)
{
return assign_eip(ctxt, dst);
}
static int assign_eip_far(struct x86_emulate_ctxt *ctxt, ulong dst)
{
int rc = emulator_recalc_and_set_mode(ctxt);
if (rc != X86EMUL_CONTINUE)
return rc;
return assign_eip(ctxt, dst);
}
static inline int jmp_rel(struct x86_emulate_ctxt *ctxt, int rel)
{
return assign_eip_near(ctxt, ctxt->_eip + rel);
}
static int linear_read_system(struct x86_emulate_ctxt *ctxt, ulong linear,
void *data, unsigned size)
{
return ctxt->ops->read_std(ctxt, linear, data, size, &ctxt->exception, true);
}
static int linear_write_system(struct x86_emulate_ctxt *ctxt,
ulong linear, void *data,
unsigned int size)
{
return ctxt->ops->write_std(ctxt, linear, data, size, &ctxt->exception, true);
}
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, false);
}
static int segmented_write_std(struct x86_emulate_ctxt *ctxt,
struct segmented_address addr,
void *data,
unsigned int size)
{
int rc;
ulong linear;
rc = linearize(ctxt, addr, size, true, &linear);
if (rc != X86EMUL_CONTINUE)
return rc;
return ctxt->ops->write_std(ctxt, linear, data, size, &ctxt->exception, false);
}
/*
* 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); \
memcpy(&_x, ctxt->fetch.ptr, sizeof(_type)); \
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 __always_inline u8 test_cc(unsigned int condition, unsigned long flags)
{
u8 rc;
void (*fop)(void) = (void *)em_setcc + FASTOP_SIZE * (condition & 0xf);
flags = (flags & EFLAGS_MASK) | X86_EFLAGS_IF;
asm("push %[flags]; popf; " CALL_NOSPEC
: "=a"(rc) : [thunk_target]"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 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);
kvm_fpu_get();
asm volatile("fninit");
kvm_fpu_put();
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);
kvm_fpu_get();
asm volatile("fnstcw %0": "+m"(fcw));
kvm_fpu_put();
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);
kvm_fpu_get();
asm volatile("fnstsw %0": "+m"(fsw));
kvm_fpu_put();
ctxt->dst.val = fsw;
return X86EMUL_CONTINUE;
}
static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
struct operand *op)
{
unsigned int reg;
if (ctxt->d & ModRM)
reg = ctxt->modrm_reg;
else
reg = (ctxt->b & 7) | ((ctxt->rex_prefix & 1) << 3);
if (ctxt->d & Sse) {
op->type = OP_XMM;
op->bytes = 16;
op->addr.xmm = reg;
kvm_read_sse_reg(reg, &op->vec_val);
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;
kvm_read_sse_reg(ctxt->modrm_rm, &op->vec_val);
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;
if (KVM_EMULATOR_BUG_ON((mc->end + size) >= sizeof(mc->data), ctxt))
return X86EMUL_UNHANDLEABLE;
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 linear_read_system(ctxt, addr, desc, sizeof(*desc));
}
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 linear_read_system(ctxt, *desc_addr_p, desc, sizeof(*desc));
}
/* 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 linear_write_system(ctxt, addr, desc, sizeof(*desc));
}
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;
/* TR should be in GDT only */
if (seg == VCPU_SREG_TR && (selector & (1 << 2)))
goto exception;
/* NULL selector is not valid for TR, CS and (except for long mode) SS */
if (null_selector) {
if (seg == VCPU_SREG_CS || seg == VCPU_SREG_TR)
goto exception;
if (seg == VCPU_SREG_SS) {
if (ctxt->mode != X86EMUL_MODE_PROT64 || rpl != cpl)
goto exception;
/*
* ctxt->ops->set_segment expects the CPL to be in
* SS.DPL, so fake an expand-up 32-bit data segment.
*/
seg_desc.type = 3;
seg_desc.p = 1;
seg_desc.s = 1;
seg_desc.dpl = cpl;
seg_desc.d = 1;
seg_desc.g = 1;
}
/* 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;
}
dpl = seg_desc.dpl;
switch (seg) {
case VCPU_SREG_SS:
/*
* segment is not a writable data segment or segment
* selector's RPL != CPL or DPL != 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 (transfer == X86_TRANSFER_RET) {
/* RET can never return to an inner privilege level. */
if (rpl < cpl)
goto exception;
/* Outer-privilege level return is not implemented */
if (rpl > cpl)
return X86EMUL_UNHANDLEABLE;
}
if (transfer == X86_TRANSFER_RET || transfer == X86_TRANSFER_TASK_SWITCH) {
if (seg_desc.type & 4) {
/* conforming */
if (dpl > rpl)
goto exception;
} else {
/* nonconforming */
if (dpl != rpl)
goto exception;
}
} else { /* X86_TRANSFER_CALL_JMP */
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;
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 ((RPL > DPL) or (CPL > DPL)))
*/
if ((seg_desc.type & 0xa) == 0x8 ||
(((seg_desc.type & 0xc) != 0xc) &&
(rpl > dpl || cpl > dpl)))
goto exception;
break;
}
if (!seg_desc.p) {
err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR;
goto exception;
}
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 = linear_read_system(ctxt, desc_addr+8, &base3, sizeof(base3));
if (ret != X86EMUL_CONTINUE)
return ret;
if (emul_is_noncanonical_address(get_desc_base(&seg_desc) |
((u64)base3 << 32), ctxt))
return emulate_gp(ctxt, err_code);
}
if (seg == VCPU_SREG_TR) {
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;
}
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);
/*
* None of MOV, POP and LSS can load a NULL selector in CPL=3, but
* they can load it at CPL<3 (Intel's manual says only LSS can,
* but it's wrong).
*
* However, the Intel manual says that putting IST=1/DPL=3 in
* an interrupt gate will result in SS=3 (the AMD manual instead
* says it doesn't), so allow SS=3 in __load_segment_descriptor
* and only forbid it here.
*/
if (seg == VCPU_SREG_SS && selector == 3 &&
ctxt->mode == X86EMUL_MODE_PROT64)
return emulate_exception(ctxt, GP_VECTOR, 0, true);
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:
kvm_write_sse_reg(op->addr.xmm, &op->vec_val);
break;
case OP_MM:
kvm_write_mmx_reg(op->addr.mm, &op->mm_val);
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 (seg == 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 = linear_read_system(ctxt, cs_addr, &cs, 2);
if (rc != X86EMUL_CONTINUE)
return rc;
rc = linear_read_system(ctxt, eip_addr, &eip, 2);
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;
struct desc_struct new_desc;
u8 cpl = ctxt->ops->cpl(ctxt);
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);
/* Error handling is not implemented. */
if (rc != X86EMUL_CONTINUE)
return X86EMUL_UNHANDLEABLE;
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;
int cpl = ctxt->ops->cpl(ctxt);
struct desc_struct new_desc;
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;
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);
/* Error handling is not implemented. */
if (rc != X86EMUL_CONTINUE)
return X86EMUL_UNHANDLEABLE;
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 int em_rsm(struct x86_emulate_ctxt *ctxt)
{
if (!ctxt->ops->is_smm(ctxt))
return emulate_ud(ctxt);
if (ctxt->ops->leave_smm(ctxt))
ctxt->ops->triple_fault(ctxt);
return emulator_recalc_and_set_mode(ctxt);
}
static void
setup_syscalls_segments(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, true);
return is_guest_vendor_intel(ebx, ecx, 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, true);
/*
* remark: Intel CPUs only support "syscall" in 64bit longmode. Also a
* 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 (is_guest_vendor_intel(ebx, ecx, edx))
return false;
if (is_guest_vendor_amd(ebx, ecx, edx) ||
is_guest_vendor_hygon(ebx, ecx, edx))
return true;
/*
* default: (not Intel, not AMD, not Hygon), 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);
if (!(efer & EFER_SCE))
return emulate_ud(ctxt);
setup_syscalls_segments(&cs, &ss);
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);
}
ctxt->tf = (ctxt->eflags & X86_EFLAGS_TF) != 0;
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;
ops->get_msr(ctxt, MSR_IA32_SYSENTER_CS, &msr_data);
if ((msr_data & 0xfffc) == 0x0)
return emulate_gp(ctxt, 0);
setup_syscalls_segments(&cs, &ss);
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;
if (efer & EFER_LMA)
ctxt->mode = X86EMUL_MODE_PROT64;
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(&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 (emul_is_noncanonical_address(rcx, ctxt) ||
emul_is_noncanonical_address(rdx, ctxt))
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;
ctxt->mode = usermode;
*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;
}
#define VMWARE_PORT_VMPORT (0x5658)
#define VMWARE_PORT_VMRPC (0x5659)
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;
/*
* VMware allows access to these ports even if denied
* by TSS I/O permission bitmap. Mimic behavior.
*/
if (enable_vmware_backdoor &&
((port == VMWARE_PORT_VMPORT) || (port == VMWARE_PORT_VMRPC)))
return true;
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, true);
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, true);
if (r != X86EMUL_CONTINUE)
return false;
if ((perm >> bit_idx) & mask)
return false;
return true;
}
static bool emulator_io_permitted(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 string_registers_quirk(struct x86_emulate_ctxt *ctxt)
{
/*
* Intel CPUs mask the counter and pointers in quite strange
* manner when ECX is zero due to REP-string optimizations.
*/
#ifdef CONFIG_X86_64
if (ctxt->ad_bytes != 4 || !vendor_intel(ctxt))
return;
*reg_write(ctxt, VCPU_REGS_RCX) = 0;
switch (ctxt->b) {
case 0xa4: /* movsb */
case 0xa5: /* movsd/w */
*reg_rmw(ctxt, VCPU_REGS_RSI) &= (u32)-1;
fallthrough;
case 0xaa: /* stosb */
case 0xab: /* stosd/w */
*reg_rmw(ctxt, VCPU_REGS_RDI) &= (u32)-1;
}
#endif
}
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 old_tss_sel,
ulong old_tss_base, struct desc_struct *new_desc)
{
struct tss_segment_16 tss_seg;
int ret;
u32 new_tss_base = get_desc_base(new_desc);
ret = linear_read_system(ctxt, old_tss_base, &tss_seg, sizeof(tss_seg));
if (ret != X86EMUL_CONTINUE)
return ret;
save_state_to_tss16(ctxt, &tss_seg);
ret = linear_write_system(ctxt, old_tss_base, &tss_seg, sizeof(tss_seg));
if (ret != X86EMUL_CONTINUE)
return ret;
ret = linear_read_system(ctxt, new_tss_base, &tss_seg, sizeof(tss_seg));
if (ret != X86EMUL_CONTINUE)
return ret;
if (old_tss_sel != 0xffff) {
tss_seg.prev_task_link = old_tss_sel;
ret = linear_write_system(ctxt, new_tss_base,
&tss_seg.prev_task_link,
sizeof(tss_seg.prev_task_link));
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 happens 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 old_tss_sel,
ulong old_tss_base, struct desc_struct *new_desc)
{
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 = linear_read_system(ctxt, old_tss_base, &tss_seg, sizeof(tss_seg));
if (ret != X86EMUL_CONTINUE)
return ret;
save_state_to_tss32(ctxt, &tss_seg);
/* Only GP registers and segment selectors are saved */
ret = linear_write_system(ctxt, old_tss_base + eip_offset, &tss_seg.eip,
ldt_sel_offset - eip_offset);
if (ret != X86EMUL_CONTINUE)
return ret;
ret = linear_read_system(ctxt, new_tss_base, &tss_seg, sizeof(tss_seg));
if (ret != X86EMUL_CONTINUE)
return ret;
if (old_tss_sel != 0xffff) {
tss_seg.prev_task_link = old_tss_sel;
ret = linear_write_system(ctxt, new_tss_base,
&tss_seg.prev_task_link,
sizeof(tss_seg.prev_task_link));
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, dr7;
/* 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, old_tss_sel, old_tss_base, &next_tss_desc);
else
ret = task_switch_16(ctxt, 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);
}
ops->get_dr(ctxt, 7, &dr7);
ops->set_dr(ctxt, 7, dr7 & ~(DR_LOCAL_ENABLE_MASK | DR_LOCAL_SLOWDOWN));
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);
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_rdpid(struct x86_emulate_ctxt *ctxt)
{
u64 tsc_aux = 0;
if (!ctxt->ops->guest_has_rdpid(ctxt))
return emulate_ud(ctxt);
ctxt->ops->get_msr(ctxt, MSR_TSC_AUX, &tsc_aux);
ctxt->dst.val = tsc_aux;
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;
}
static int em_movbe(struct x86_emulate_ctxt *ctxt)
{
u16 tmp;
if (!ctxt->ops->guest_has_movbe(ctxt))
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)
{
int cr_num = ctxt->modrm_reg;
int r;
if (ctxt->ops->set_cr(ctxt, cr_num, ctxt->src.val))
return emulate_gp(ctxt, 0);
/* Disable writeback. */
ctxt->dst.type = OP_NONE;
if (cr_num == 0) {
/*
* CR0 write might have updated CR0.PE and/or CR0.PG
* which can affect the cpu's execution mode.
*/
r = emulator_recalc_and_set_mode(ctxt);
if (r != X86EMUL_CONTINUE)
return r;
}
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_index = reg_read(ctxt, VCPU_REGS_RCX);
u64 msr_data;
int r;
msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX)
| ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32);
r = ctxt->ops->set_msr_with_filter(ctxt, msr_index, msr_data);
if (r == X86EMUL_PROPAGATE_FAULT)
return emulate_gp(ctxt, 0);
return r;
}
static int em_rdmsr(struct x86_emulate_ctxt *ctxt)
{
u64 msr_index = reg_read(ctxt, VCPU_REGS_RCX);
u64 msr_data;
int r;
r = ctxt->ops->get_msr_with_filter(ctxt, msr_index, &msr_data);
if (r == X86EMUL_PROPAGATE_FAULT)
return emulate_gp(ctxt, 0);
if (r == X86EMUL_CONTINUE) {
*reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data;
*reg_write(ctxt, VCPU_REGS_RDX) = msr_data >> 32;
}
return r;
}
static int em_store_sreg(struct x86_emulate_ctxt *ctxt, int segment)
{
if (segment > VCPU_SREG_GS &&
(ctxt->ops->get_cr(ctxt, 4) & X86_CR4_UMIP) &&
ctxt->ops->cpl(ctxt) > 0)
return emulate_gp(ctxt, 0);
ctxt->dst.val = get_segment_selector(ctxt, segment);
if (ctxt->dst.bytes == 4 && ctxt->dst.type == OP_MEM)
ctxt->dst.bytes = 2;
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);
return em_store_sreg(ctxt, ctxt->modrm_reg);
}
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_sldt(struct x86_emulate_ctxt *ctxt)
{
return em_store_sreg(ctxt, VCPU_SREG_LDTR);
}
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_str(struct x86_emulate_ctxt *ctxt)
{
return em_store_sreg(ctxt, VCPU_SREG_TR);
}
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->ops->get_cr(ctxt, 4) & X86_CR4_UMIP) &&
ctxt->ops->cpl(ctxt) > 0)
return emulate_gp(ctxt, 0);
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_std(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 &&
emul_is_noncanonical_address(desc_ptr.address, ctxt))
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->ops->get_cr(ctxt, 4) & X86_CR4_UMIP) &&
ctxt->ops->cpl(ctxt) > 0)
return emulate_gp(ctxt, 0);
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;
u64 msr = 0;
ctxt->ops->get_msr(ctxt, MSR_MISC_FEATURES_ENABLES, &msr);
if (msr & MSR_MISC_FEATURES_ENABLES_CPUID_FAULT &&
ctxt->ops->cpl(ctxt)) {
return emulate_gp(ctxt, 0);
}
eax = reg_read(ctxt, VCPU_REGS_RAX);
ecx = reg_read(ctxt, VCPU_REGS_RCX);
ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx, false);
*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_clflushopt(struct x86_emulate_ctxt *ctxt)
{
/* emulating clflushopt 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 int check_fxsr(struct x86_emulate_ctxt *ctxt)
{
if (!ctxt->ops->guest_has_fxsr(ctxt))
return emulate_ud(ctxt);
if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
return emulate_nm(ctxt);
/*
* Don't emulate a case that should never be hit, instead of working
* around a lack of fxsave64/fxrstor64 on old compilers.
*/
if (ctxt->mode >= X86EMUL_MODE_PROT64)
return X86EMUL_UNHANDLEABLE;
return X86EMUL_CONTINUE;
}
/*
* Hardware doesn't save and restore XMM 0-7 without CR4.OSFXSR, but does save
* and restore MXCSR.
*/
static size_t __fxstate_size(int nregs)
{
return offsetof(struct fxregs_state, xmm_space[0]) + nregs * 16;
}
static inline size_t fxstate_size(struct x86_emulate_ctxt *ctxt)
{
bool cr4_osfxsr;
if (ctxt->mode == X86EMUL_MODE_PROT64)
return __fxstate_size(16);
cr4_osfxsr = ctxt->ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR;
return __fxstate_size(cr4_osfxsr ? 8 : 0);
}
/*
* FXSAVE and FXRSTOR have 4 different formats depending on execution mode,
* 1) 16 bit mode
* 2) 32 bit mode
* - like (1), but FIP and FDP (foo) are only 16 bit. At least Intel CPUs
* preserve whole 32 bit values, though, so (1) and (2) are the same wrt.
* save and restore
* 3) 64-bit mode with REX.W prefix
* - like (2), but XMM 8-15 are being saved and restored
* 4) 64-bit mode without REX.W prefix
* - like (3), but FIP and FDP are 64 bit
*
* Emulation uses (3) for (1) and (2) and preserves XMM 8-15 to reach the
* desired result. (4) is not emulated.
*
* Note: Guest and host CPUID.(EAX=07H,ECX=0H):EBX[bit 13] (deprecate FPU CS
* and FPU DS) should match.
*/
static int em_fxsave(struct x86_emulate_ctxt *ctxt)
{
struct fxregs_state fx_state;
int rc;
rc = check_fxsr(ctxt);
if (rc != X86EMUL_CONTINUE)
return rc;
kvm_fpu_get();
rc = asm_safe("fxsave %[fx]", , [fx] "+m"(fx_state));
kvm_fpu_put();
if (rc != X86EMUL_CONTINUE)
return rc;
return segmented_write_std(ctxt, ctxt->memop.addr.mem, &fx_state,
fxstate_size(ctxt));
}
/*
* FXRSTOR might restore XMM registers not provided by the guest. Fill
* in the host registers (via FXSAVE) instead, so they won't be modified.
* (preemption has to stay disabled until FXRSTOR).
*
* Use noinline to keep the stack for other functions called by callers small.
*/
static noinline int fxregs_fixup(struct fxregs_state *fx_state,
const size_t used_size)
{
struct fxregs_state fx_tmp;
int rc;
rc = asm_safe("fxsave %[fx]", , [fx] "+m"(fx_tmp));
memcpy((void *)fx_state + used_size, (void *)&fx_tmp + used_size,
__fxstate_size(16) - used_size);
return rc;
}
static int em_fxrstor(struct x86_emulate_ctxt *ctxt)
{
struct fxregs_state fx_state;
int rc;
size_t size;
rc = check_fxsr(ctxt);
if (rc != X86EMUL_CONTINUE)
return rc;
size = fxstate_size(ctxt);
rc = segmented_read_std(ctxt, ctxt->memop.addr.mem, &fx_state, size);
if (rc != X86EMUL_CONTINUE)
return rc;
kvm_fpu_get();
if (size < __fxstate_size(16)) {
rc = fxregs_fixup(&fx_state, size);
if (rc != X86EMUL_CONTINUE)
goto out;
}
if (fx_state.mxcsr >> 16) {
rc = emulate_gp(ctxt, 0);
goto out;
}
if (rc == X86EMUL_CONTINUE)
rc = asm_safe("fxrstor %[fx]", : [fx] "m"(fx_state));
out:
kvm_fpu_put();
return rc;
}
static int em_xsetbv(struct x86_emulate_ctxt *ctxt)
{
u32 eax, ecx, edx;
if (!(ctxt->ops->get_cr(ctxt, 4) & X86_CR4_OSXSAVE))
return emulate_ud(ctxt);
eax = reg_read(ctxt, VCPU_REGS_RAX);
edx = reg_read(ctxt, VCPU_REGS_RDX);
ecx = reg_read(ctxt, VCPU_REGS_RCX);
if (ctxt->ops->set_xcr(ctxt, ecx, ((u64)edx << 32) | eax))
return emulate_gp(ctxt, 0);
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_access(struct x86_emulate_ctxt *ctxt)
{
if (!valid_cr(ctxt->modrm_reg))
return emulate_ud(ctxt);
return X86EMUL_CONTINUE;
}
static int check_dr7_gd(struct x86_emulate_ctxt *ctxt)
{
unsigned long dr7;
ctxt->ops->get_dr(ctxt, 7, &dr7);
return dr7 & DR7_GD;
}
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 &= ~DR_TRAP_BITS;
dr6 |= DR6_BD | DR6_ACTIVE_LOW;
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 = 0;
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_gp(ctxt, 0);
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);
/*
* VMware allows access to these Pseduo-PMCs even when read via RDPMC
* in Ring3 when CR4.PCE=0.
*/
if (enable_vmware_backdoor && is_vmware_backdoor_pmc(rcx))
return X86EMUL_CONTINUE;
/*
* If CR4.PCE is set, the SDM requires CPL=0 or CR0.PE=0. The CR0.PE
* check however is unnecessary because CPL is always 0 outside
* protected mode.
*/
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_permitted(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_permitted(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_rm2[] = {
N,
II(ImplicitOps | Priv, em_xsetbv, xsetbv),
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 | TwoMemOp, 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 | IsBranch, em_call_near_abs),
I(SrcMemFAddr | ImplicitOps | IsBranch, em_call_far),
I(SrcMem | NearBranch | IsBranch, em_jmp_abs),
I(SrcMemFAddr | ImplicitOps | IsBranch, em_jmp_far),
I(SrcMem | Stack | TwoMemOp, em_push), D(Undefined),
};
static const struct opcode group6[] = {
II(Prot | DstMem, em_sldt, sldt),
II(Prot | DstMem, em_str, 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),
EXT(0, group7_rm2),
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),
};
/*
* The "memory" destination is actually always a register, since we come
* from the register case of group9.
*/
static const struct gprefix pfx_0f_c7_7 = {
N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdpid),
};
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,
GP(0, &pfx_0f_c7_7),
} };
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), I(SrcMem | ByteOp, em_clflushopt), N, N,
};
static const struct group_dual group15 = { {
I(ModRM | Aligned16, em_fxsave),
I(ModRM | Aligned16, em_fxrstor),
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_10_0f_11 = {
I(Unaligned, em_mov), I(Unaligned, em_mov), 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 instr_dual instr_dual_8d = {
D(DstReg | SrcMem | ModRM | NoAccess), N
};
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 | IsBranch)),
/* 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),
ID(0, &instr_dual_8d),
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 | IsBranch, 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 | TwoMemOp, em_mov),
F2bv(SrcSI | DstDI | String | NoWrite | TwoMemOp, 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 | IsBranch, em_ret_near_imm),
I(ImplicitOps | NearBranch | IsBranch, 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 | IsBranch, em_enter),
I(Stack | IsBranch, em_leave),
I(ImplicitOps | SrcImmU16 | IsBranch, em_ret_far_imm),
I(ImplicitOps | IsBranch, em_ret_far),
D(ImplicitOps | IsBranch), DI(SrcImmByte | IsBranch, intn),
D(ImplicitOps | No64 | IsBranch),
II(ImplicitOps | IsBranch, 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 | IsBranch, em_loop)),
I(SrcImmByte | NearBranch | IsBranch, 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 | IsBranch, em_call),
D(SrcImm | ImplicitOps | NearBranch | IsBranch),
I(SrcImmFAddr | No64 | IsBranch, em_jmp_far),
D(SrcImmByte | ImplicitOps | NearBranch | IsBranch),
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 | IsBranch, 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 */
GP(ModRM | DstReg | SrcMem | Mov | Sse, &pfx_0f_10_0f_11),
GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_10_0f_11),
N, N, N, N, N, N,
D(ImplicitOps | ModRM | SrcMem | NoAccess), /* 4 * prefetch + 4 * reserved NOP */
D(ImplicitOps | ModRM | SrcMem | NoAccess), N, N,
D(ImplicitOps | ModRM | SrcMem | NoAccess), /* 8 * reserved NOP */
D(ImplicitOps | ModRM | SrcMem | NoAccess), /* 8 * reserved NOP */
D(ImplicitOps | ModRM | SrcMem | NoAccess), /* 8 * reserved NOP */
D(ImplicitOps | ModRM | SrcMem | NoAccess), /* NOP + 7 * reserved NOP */
/* 0x20 - 0x2F */
DIP(ModRM | DstMem | Priv | Op3264 | NoMod, cr_read, check_cr_access),
DIP(ModRM | DstMem | Priv | Op3264 | NoMod, dr_read, check_dr_read),
IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_cr_write, cr_write,
check_cr_access),
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 | IsBranch, em_sysenter),
I(ImplicitOps | Priv | EmulateOnUD | IsBranch, 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 | IsBranch)),
/* 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),
II(EmulateOnUD | ImplicitOps, em_rsm, 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 emulation_type)
{
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;
u16 dummy;
struct desc_struct desc;
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;
ctxt->intercept = x86_intercept_none;
if (insn_len > 0)
memcpy(ctxt->fetch.data, insn, insn_len);
else {
rc = __do_insn_fetch_bytes(ctxt, 1);
if (rc != X86EMUL_CONTINUE)
goto done;
}
switch (mode) {
case X86EMUL_MODE_REAL:
case X86EMUL_MODE_VM86:
def_op_bytes = def_ad_bytes = 2;
ctxt->ops->get_segment(ctxt, &dummy, &desc, NULL, VCPU_SREG_CS);
if (desc.d)
def_op_bytes = def_ad_bytes = 4;
break;
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 */
has_seg_override = true;
ctxt->seg_override = VCPU_SREG_ES;
break;
case 0x2e: /* CS override */
has_seg_override = true;
ctxt->seg_override = VCPU_SREG_CS;
break;
case 0x36: /* SS override */
has_seg_override = true;
ctxt->seg_override = VCPU_SREG_SS;
break;
case 0x3e: /* DS override */
has_seg_override = true;
ctxt->seg_override = VCPU_SREG_DS;
break;
case 0x64: /* FS override */
has_seg_override = true;
ctxt->seg_override = VCPU_SREG_FS;
break;
case 0x65: /* GS override */
has_seg_override = true;
ctxt->seg_override = VCPU_SREG_GS;
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) {
size_t size = ARRAY_SIZE(opcode.u.esc->high);
u32 index = array_index_nospec(
ctxt->modrm - 0xc0, size);
opcode = opcode.u.esc->high[index];
} 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;
}
ctxt->is_branch = opcode.flags & IsBranch;
/* Unrecognised? */
if (ctxt->d == 0)
return EMULATION_FAILED;
ctxt->execute = opcode.u.execute;
if (unlikely(emulation_type & EMULTYPE_TRAP_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 && likely(ctxt->memopp))
ctxt->memopp->addr.mem.ea = address_mask(ctxt,
ctxt->memopp->addr.mem.ea + ctxt->_eip);
done:
if (rc == X86EMUL_PROPAGATE_FAULT)
ctxt->have_exception = true;
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)
{
int rc;
kvm_fpu_get();
rc = asm_safe("fwait");
kvm_fpu_put();
if (unlikely(rc != X86EMUL_CONTINUE))
return emulate_exception(ctxt, MF_VECTOR, 0, false);
return X86EMUL_CONTINUE;
}
static void fetch_possible_mmx_operand(struct operand *op)
{
if (op->type == OP_MM)
kvm_read_mmx_reg(op->addr.mm, &op->mm_val);
}
static int fastop(struct x86_emulate_ctxt *ctxt, fastop_t fop)
{
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_NOSPEC " ; pushf; pop %[flags]\n"
: "+a"(ctxt->dst.val), "+d"(ctxt->src.val), [flags]"+D"(flags),
[thunk_target]"+S"(fop), ASM_CALL_CONSTRAINT
: "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)
{
/* Clear fields that are set conditionally but read without a guard. */
ctxt->rip_relative = false;
ctxt->rex_prefix = 0;
ctxt->lock_prefix = 0;
ctxt->rep_prefix = 0;
ctxt->regs_valid = 0;
ctxt->regs_dirty = 0;
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;
bool is_guest_mode = ctxt->ops->is_guest_mode(ctxt);
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->src);
fetch_possible_mmx_operand(&ctxt->src2);
if (!(ctxt->d & Mov))
fetch_possible_mmx_operand(&ctxt->dst);
}
if (unlikely(is_guest_mode) && ctxt->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(is_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) {
string_registers_quirk(ctxt);
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(is_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)
rc = fastop(ctxt, ctxt->fop);
else
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;
if (ctxt->mode != X86EMUL_MODE_PROT64)
ctxt->eip = (u32)ctxt->_eip;
done:
if (rc == X86EMUL_PROPAGATE_FAULT) {
if (KVM_EMULATOR_BUG_ON(ctxt->exception.vector > 0x1f, ctxt))
return EMULATION_FAILED;
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);
}
bool emulator_can_use_gpa(struct x86_emulate_ctxt *ctxt)
{
if (ctxt->rep_prefix && (ctxt->d & String))
return false;
if (ctxt->d & TwoMemOp)
return false;
return true;
}