Re: [Patch] (big) real mode emulation - push reg

[Nitin A Kamble <nitin.a.kamble-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

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On Fri, 2007-08-17 at 05:21 -0700, Avi Kivity wrote:

> I don't thing 'd |= Mov' is necessary any more to force writeback.
> Please check.
> 
Hi Avi,
You are right, it was a bit stale code.

> Also, please keep opcodes in sorted order.
It is now.
Resending the updated "push reg" emulation patch.
Please Apply or comment.

-- 
Thanks & Regards,
Nitin
Open Source Technology Center, Intel Corporation
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commit 8e55a4dad9f74ed9d883f1faccd11405d6775344
Author: Nitin A Kamble <nitin.a.kamble@intel.com>
Date:   Fri Aug 17 18:47:18 2007 -0700

    Implementing emulation of instructions:
            push reg (opcode 0x50-0x57)
    
    Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index fed0b2a..4eec909 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -99,7 +99,8 @@ static u8 opcode_table[256] = {
 	/* 0x40 - 0x4F */
 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 	/* 0x50 - 0x57 */
-	0, 0, 0, 0, 0, 0, 0, 0,
+	ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
+	ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
 	/* 0x58 - 0x5F */
 	ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
 	ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
@@ -1148,6 +1149,19 @@ special_insn:
 	if (twobyte)
 		goto twobyte_special_insn;
 	switch(b) {
+	case 0x50 ... 0x57:  /* push reg */
+		if (op_bytes == 2)
+			src.val = (u16) _regs[b & 0x7];
+		else
+			src.val = (u32) _regs[b & 0x7];
+		dst.type  = OP_MEM;
+		dst.bytes = op_bytes;
+		dst.val = src.val;
+		register_address_increment(_regs[VCPU_REGS_RSP], -op_bytes);
+		dst.ptr = (void *) register_address(
+			ctxt->ss_base, _regs[VCPU_REGS_RSP]);
+		no_wb = 1; /* force writeback */
+		break;
 	case 0x6c:		/* insb */
 	case 0x6d:		/* insw/insd */
 		 if (kvm_emulate_pio_string(ctxt->vcpu, NULL,
@@ -1384,6 +1398,7 @@ btc:		/* btc */
 		dst.val = (d & ByteOp) ? (s8) src.val : (s16) src.val;
 		break;
 	}
+
 	goto writeback;
 
 twobyte_special_insn:

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