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From: Aurelien Jarno <aurelien@aurel32.net>
Date: Sun, 13 Sep 2015 23:03:45 +0200
Subject: [PATCH] target-ppc: fix xscmpodp and xscmpudp decoding

The xscmpodp and xscmpudp instructions only have the AX, BX bits in
there encoding, the lowest bit (usually TX) is marked as an invalid
bit. We therefore can't decode them with GEN_XX2FORM, which decodes
the two lowest bit.

Introduce a new form GEN_XX2FORM, which decodes AX and BX and mark
the lowest bit as invalid.

Cc: Tom Musta <tommusta@gmail.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: qemu-stable@nongnu.org
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 target-ppc/translate.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 8f255ea..13866b9 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -10670,6 +10670,13 @@ GEN_HANDLER2_E(name, #name, 0x3C, opc2 | 1, opc3, 0, PPC_NONE, fl2), \
 GEN_HANDLER2_E(name, #name, 0x3C, opc2 | 2, opc3, 0, PPC_NONE, fl2), \
 GEN_HANDLER2_E(name, #name, 0x3C, opc2 | 3, opc3, 0, PPC_NONE, fl2)
 
+#undef GEN_XX2IFORM
+#define GEN_XX2IFORM(name, opc2, opc3, fl2)                           \
+GEN_HANDLER2_E(name, #name, 0x3C, opc2 | 0, opc3, 1, PPC_NONE, fl2), \
+GEN_HANDLER2_E(name, #name, 0x3C, opc2 | 1, opc3, 1, PPC_NONE, fl2), \
+GEN_HANDLER2_E(name, #name, 0x3C, opc2 | 2, opc3, 1, PPC_NONE, fl2), \
+GEN_HANDLER2_E(name, #name, 0x3C, opc2 | 3, opc3, 1, PPC_NONE, fl2)
+
 #undef GEN_XX3_RC_FORM
 #define GEN_XX3_RC_FORM(name, opc2, opc3, fl2)                          \
 GEN_HANDLER2_E(name, #name, 0x3C, opc2 | 0x00, opc3 | 0x00, 0, PPC_NONE, fl2), \
@@ -10731,8 +10738,8 @@ GEN_XX3FORM(xsnmaddadp, 0x04, 0x14, PPC2_VSX),
 GEN_XX3FORM(xsnmaddmdp, 0x04, 0x15, PPC2_VSX),
 GEN_XX3FORM(xsnmsubadp, 0x04, 0x16, PPC2_VSX),
 GEN_XX3FORM(xsnmsubmdp, 0x04, 0x17, PPC2_VSX),
-GEN_XX2FORM(xscmpodp,  0x0C, 0x05, PPC2_VSX),
-GEN_XX2FORM(xscmpudp,  0x0C, 0x04, PPC2_VSX),
+GEN_XX2IFORM(xscmpodp,  0x0C, 0x05, PPC2_VSX),
+GEN_XX2IFORM(xscmpudp,  0x0C, 0x04, PPC2_VSX),
 GEN_XX3FORM(xsmaxdp, 0x00, 0x14, PPC2_VSX),
 GEN_XX3FORM(xsmindp, 0x00, 0x15, PPC2_VSX),
 GEN_XX2FORM(xscvdpsp, 0x12, 0x10, PPC2_VSX),