[src/trunk]: src/common/lib/libx86emu Fix decoding of near CALL when address-...

[joerg <joerg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c94d83205f6f
branches:  trunk
changeset: 797942:c94d83205f6f
user:      joerg <joerg%NetBSD.org@localhost>
date:      Mon Aug 04 21:41:44 2014 +0000

description:
Fix decoding of near CALL when address-size prefix (67h) is present.

>From Wolf Ramovsky via FreeBSD.

diffstat:

 common/lib/libx86emu/x86emu.c |  21 ++++++++++++++-------
 1 files changed, 14 insertions(+), 7 deletions(-)

diffs (35 lines):

diff -r 832e3f2cdfbe -r c94d83205f6f common/lib/libx86emu/x86emu.c
--- a/common/lib/libx86emu/x86emu.c     Mon Aug 04 21:40:11 2014 +0000
+++ b/common/lib/libx86emu/x86emu.c     Mon Aug 04 21:41:44 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: x86emu.c,v 1.9 2014/08/04 21:40:11 joerg Exp $ */
+/*     $NetBSD: x86emu.c,v 1.10 2014/08/04 21:41:44 joerg Exp $        */
 
 /****************************************************************************
 *
@@ -3604,12 +3604,19 @@
 static void
 x86emuOp_call_near_IMM(struct X86EMU *emu)
 {
-       int16_t ip;
-
-       ip = (int16_t) fetch_word_imm(emu);
-       ip += (int16_t) emu->x86.R_IP;  /* CHECK SIGN */
-       push_word(emu, emu->x86.R_IP);
-       emu->x86.R_IP = ip;
+       if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
+               int32_t ip;
+               ip = (int32_t) fetch_long_imm(emu);
+               ip += (int32_t) emu->x86.R_EIP;
+               push_long(emu, emu->x86.R_EIP);
+               emu->x86.R_EIP = ip;
+       } else {
+               int16_t ip;
+               ip = (int16_t) fetch_word_imm(emu);
+               ip += (int16_t) emu->x86.R_IP;  /* CHECK SIGN */
+               push_word(emu, emu->x86.R_IP);
+               emu->x86.R_IP = ip;
+       }
 }
 /****************************************************************************
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