From 50e90be14b7517ace1ac7ec65635e81640556aed Mon Sep 17 00:00:00 2001
From: Aleksandar Andrejevic <aandrejevic@reactos.org>
Date: Sat, 31 Aug 2013 21:23:31 +0000
Subject: [PATCH] [SOFT386] Implement the short unconditional jump instruction
 (JMP imm8).

svn path=/branches/ntvdm/; revision=59932
---
 lib/soft386/opcodes.c | 24 +++++++++++++++++++++++-
 lib/soft386/opcodes.h |  8 ++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/lib/soft386/opcodes.c b/lib/soft386/opcodes.c
index 51ed74e4d4d..0aa22fd6efd 100644
--- a/lib/soft386/opcodes.c
+++ b/lib/soft386/opcodes.c
@@ -259,7 +259,7 @@ Soft386OpcodeHandlers[SOFT386_NUM_OPCODE_HANDLERS] =
     NULL, // TODO: OPCODE 0xE8 NOT SUPPORTED
     NULL, // TODO: OPCODE 0xE9 NOT SUPPORTED
     NULL, // TODO: OPCODE 0xEA NOT SUPPORTED
-    NULL, // TODO: OPCODE 0xEB NOT SUPPORTED
+    Soft386OpcodeShortJump,
     Soft386OpcodeInByte,
     Soft386OpcodeIn,
     Soft386OpcodeOutByte,
@@ -1146,3 +1146,25 @@ Soft386OpcodeOut(PSOFT386_STATE State, UCHAR Opcode)
 
     return TRUE;
 }
+
+BOOLEAN
+FASTCALL
+Soft386OpcodeShortJump(PSOFT386_STATE State, UCHAR Opcode)
+{
+    CHAR Offset = 0;
+
+    /* Make sure this is the right instruction */
+    ASSERT(Opcode == 0xEB);
+
+    /* Fetch the offset */
+    if (!Soft386FetchByte(State, (PUCHAR)&Offset))
+    {
+        /* An exception occurred */
+        return FALSE;
+    }
+
+    /* Move the instruction pointer */        
+    State->InstPtr.Long += Offset;
+
+    return TRUE;
+}
diff --git a/lib/soft386/opcodes.h b/lib/soft386/opcodes.h
index 801c05b6d08..8a560e97bab 100644
--- a/lib/soft386/opcodes.h
+++ b/lib/soft386/opcodes.h
@@ -183,4 +183,12 @@ Soft386OpcodeOut
     UCHAR Opcode
 );
 
+BOOLEAN
+FASTCALL
+Soft386OpcodeShortJump
+(
+    PSOFT386_STATE State,
+    UCHAR Opcode
+);
+
 #endif // _OPCODES_H_