[Patch] (big) real mode emulation - jmp rel

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

[-- Attachment #1.1.1.1: Type: text/plain, Size: 294 bytes --]

Hi Avi,
    The patch to implement "jmp rel" emulation is attached.

Thanks & Regards,
Nitin 
Open Source Technology Center, Intel Corporation.
-------------------------------------------------------------------------
The mind is like a parachute; it works much better when it's open. 

[-- Attachment #1.1.1.2: Type: text/html, Size: 934 bytes --]

[-- Attachment #1.1.2: jmprel.patch --]
[-- Type: text/x-patch, Size: 1537 bytes --]

commit 1d77b7ad2bcb20858dd66d9653952a8d1cc0a153
Author: Nitin A Kamble <nitin.a.kamble@intel.com>
Date:   Fri Aug 10 18:36:12 2007 -0700

    Implement instruction "jmp rel" opcode 0xe9
    
    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 b4f439c..40fb6ee 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -145,8 +145,10 @@ static u8 opcode_table[256] = {
 	0, 0, 0, 0,
 	/* 0xD8 - 0xDF */
 	0, 0, 0, 0, 0, 0, 0, 0,
-	/* 0xE0 - 0xEF */
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	/* 0xE0 - 0xE7 */
+	0, 0, 0, 0, 0, 0, 0, 0,
+	/* 0xE8 - 0xEF */
+	0, SrcImm|ImplicitOps, 0, 0, 0, 0, 0, 0,
 	/* 0xF0 - 0xF7 */
 	0, 0, 0, 0,
 	ImplicitOps, 0,
@@ -447,6 +449,12 @@ struct operand {
 			   (((reg) + _inc) & ((1UL << (ad_bytes << 3)) - 1)); \
 	} while (0)
 
+#define jmp_rel(rel)							\
+do {									\
+	_eip += (int)(rel);						\
+	_eip = ((op_bytes == 2) ? (uint16_t)_eip : (uint32_t)_eip);	\
+} while (0)
+
 /*
  * Given the 'reg' portion of a ModRM byte, and a register block, return a
  * pointer into the block that addresses the relevant register.
@@ -1200,6 +1208,10 @@ special_insn:
 	case 0xae ... 0xaf:	/* scas */
 		DPRINTF("Urk! I don't handle SCAS.\n");
 		goto cannot_emulate;
+	case 0xe9: /* jmp rel */
+		jmp_rel(src.val);
+		no_wb = 1; /* Disable writeback. */
+		break;
 	case 0xf4:              /* hlt */
 		ctxt->vcpu->halt_request = 1;
 		goto done;

[-- Attachment #1.2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 189 bytes --]

[-- Attachment #2: Type: text/plain, Size: 315 bytes --]

-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems?  Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >>  http://get.splunk.com/

[-- Attachment #3: Type: text/plain, Size: 186 bytes --]

_______________________________________________
kvm-devel mailing list
kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
https://lists.sourceforge.net/lists/listinfo/kvm-devel