[valgrind] [Bug 489088] Valgrind throws unhandled instruction bytes: 0xC5 0x79 0xD6 0xE0 0xC5 0xFA 0x7E 0xDB 0xC5 0xF8

[Mark Wielaard]

https://bugs.kde.org/show_bug.cgi?id=489088

--- Comment #8 from Mark Wielaard <m...@klomp.org> ---
So I think the implementation should be something like:

diff --git a/VEX/priv/guest_amd64_toIR.c b/VEX/priv/guest_amd64_toIR.c
index 28c37f092211..a7ea5951aac7 100644
--- a/VEX/priv/guest_amd64_toIR.c
+++ b/VEX/priv/guest_amd64_toIR.c
@@ -27026,6 +27026,14 @@ Long dis_ESC_0F__VEX (
          if (epartIsReg(modrm)) {
             /* fall through, awaiting test case */
             /* dst: lo half copied, hi half zeroed */
+            UInt rE = eregOfRexRM(pfx,modrm);
+            putXMMRegLane64( rE, 0, getXMMRegLane64( rG, 0 ));
+            /* zero bits 255:64 */
+            putXMMRegLane64( rG, 1, mkU64(0) );
+            putYMMRegLane128( rG, 1, mkV128(0) );
+            DIP("vmovq %s,%s\n", nameXMMReg(rG), nameXMMReg(rE));
+            delta += 1;
+            goto decode_success;
          } else {
             addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
             storeLE( mkexpr(addr), getXMMRegLane64( rG, 0 ));

But obviously we need some real test cases.

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