From d3b41127c205062ca6c29c89c9542c4112c39ca0 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Sat, 12 Aug 2023 08:48:18 -0700 Subject: [PATCH] tcg/i386: Output %gs prefix in tcg_out_vex_opc Missing the segment prefix means that user-only fails to add guest_base for some 128-bit load/store. Fixes: 098d0fc10d2 ("tcg/i386: Support 128-bit load/store") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1763 Signed-off-by: Richard Henderson --- tcg/i386/tcg-target.c.inc | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc index 77482da070..a6b2eae995 100644 --- a/tcg/i386/tcg-target.c.inc +++ b/tcg/i386/tcg-target.c.inc @@ -595,6 +595,9 @@ static void tcg_out_vex_opc(TCGContext *s, int opc, int r, int v, { int tmp; + if (opc & P_GS) { + tcg_out8(s, 0x65); + } /* Use the two byte form if possible, which cannot encode VEX.W, VEX.B, VEX.X, or an m-mmmm field other than P_EXT. */ if ((opc & (P_EXT | P_EXT38 | P_EXT3A | P_VEXW)) == P_EXT