Most x86 two operand instructions allow the destination to be a memory operand,
but IMUL (for example) requires that the destination be a register.  Change
____emulate_2op() to take a register for both source and destination so we
can invoke IMUL.
Signed-off-by: NAvi Kivity <avi@redhat.com>

We'll need it later so we can use a register for the destination.
Signed-off-by: NAvi Kivity <avi@redhat.com>

Add LOOP/LOOPcc instruction emulation (opcode 0xe0~0xe2).
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Add CBW/CWDE/CDQE instruction emulation.(opcode 0x98)
Used by FreeBSD's boot loader.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

EFLAGS.ZF needs to be checked after each iteration, not before.
Signed-off-by: NAvi Kivity <avi@redhat.com>

Signed-off-by: NAvi Kivity <avi@redhat.com>

emulate_push() only schedules a push; it doesn't actually push anything.
Call writeback() to flush out the write.
Signed-off-by: NAvi Kivity <avi@redhat.com>

Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Change OUT instruction to use dst instead of src, so we can
reuse those code for all out instructions.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Introduce DstImmUByte for dst operand decode, which
will be used for out instruction.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Add setcc instruction emulation (opcode 0x0f 0x90~0x9f)
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Add XADD instruction emulation (opcode 0x0f 0xc0~0xc1)
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Introduce function write_register_operand() to write back the
register operand.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

The code for initializing the emulation context is duplicated at two
locations (emulate_instruction() and kvm_task_switch()). Separate it
in a separate function and call it from there.
Signed-off-by: NMohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Add bsf/bsr instruction emulation (opcode 0x0f 0xbc~0xbd)
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

This patch lets emulate_grp3() return X86EMUL_* return codes instead
of hardcoded ones.
Signed-off-by: NMohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

This adds unary mul, imul, div, and idiv instructions (group 3 r/m 4-7).
Signed-off-by: NMohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Mask group 8 instruction as BitOp, so we can share the
code for adjust the source operand.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

adjust the dst address for a register source but not adjust the
address for an immediate source.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

If bit offset operands is a negative number, BitOp instruction
will return wrong value. This patch fix it.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Signed-off-by: NMohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Using SrcOne for instruction d0/d1 decoding.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

This patch change to disable writeback when decode dest
operand if the dest type is ImplicitOps or not specified.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Use SrcAcc to simplify stos decoding.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

This adds support for int instructions to the emulator.
Signed-off-by: NMohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

The patch adds a new member get_idt() to x86_emulate_ops.
It also adds a function to get the idt in order to be used by the emulator.

This is needed for real mode interrupt injection and the emulation of int
instructions.
Signed-off-by: NMohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Two-byte opcode always start with 0x0F and the decode flags
of opcode 0xF0 is always 0, so remove dup check.
Signed-off-by: NWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Currently x86 is the only architecture that uses kvm_guest_init(). With
PowerPC we're getting a second user, but the signature is different there
and we don't need to export it, as it uses the normal kernel init framework.

So let's move the x86 specific definition of that function over to the x86
specfic header file.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NAvi Kivity <avi@redhat.com>

If a nop instruction is encountered, we jump directly to the done label.
This skip updating rip. Break from the switch case instead
Signed-off-by: NMohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

Since modrm operand can be either register or memory, decoding it into
a 'struct operand', which can represent both, is simpler.
Signed-off-by: NAvi Kivity <avi@redhat.com>

Instead of using modrm_ea, which will soon be gone.
Signed-off-by: NAvi Kivity <avi@redhat.com>

The NoAccess flag will prevent memory from being accessed.
Signed-off-by: NAvi Kivity <avi@redhat.com>

Use for INVLPG, which accesses the tlb, not memory.
Signed-off-by: NAvi Kivity <avi@redhat.com>

This is an ordinary modrm source or destination; use the standard structure
representing it.
Signed-off-by: NAvi Kivity <avi@redhat.com>

This is an ordinary modrm source or destination; use the standard structure
representing it.
Signed-off-by: NAvi Kivity <avi@redhat.com>

Signed-off-by: NAvi Kivity <avi@redhat.com>

The operands for these instructions are 32 bits or 64 bits, depending on
long mode, and ignoring REX prefixes, or the operand size prefix.
Signed-off-by: NAvi Kivity <avi@redhat.com>

(x && (x & y)) == (x & y)
Signed-off-by: NAvi Kivity <avi@redhat.com>

Unused (and has never been).
Signed-off-by: NAvi Kivity <avi@redhat.com>