[Stable-7.2.15,02/33] target/ppc: Fix lxvx/stxvx facility check

Commit Message

Michael Tokarev Nov. 9, 2024, 6:38 a.m. UTC

From: Fabiano Rosas <[e-mail]>

The XT check for the lxvx/stxvx instructions is currently
inverted. This was introduced during the move to decodetree.

>From the ISA:
  Chapter 7. Vector-Scalar Extension Facility
  Load VSX Vector Indexed X-form

  lxvx XT,RA,RB
  if TX=0 & MSR.VSX=0 then VSX_Unavailable()
  if TX=1 & MSR.VEC=0 then Vector_Unavailable()
  ...
  Let XT be the value 32×TX + T.

The code currently does the opposite:

    if (paired || a->rt >= 32) {
        REQUIRE_VSX(ctx);
    } else {
        REQUIRE_VECTOR(ctx);
    }

This was already fixed for lxv/stxv at commit "2cc0e449d1 (target/ppc:
Fix lxv/stxv MSR facility check)", but the indexed forms were missed.

Cc: [e-mail]
Fixes: 70426b5bb7 ("target/ppc: moved stxvx and lxvx from legacy to decodtree")
Signed-off-by: Fabiano Rosas <[e-mail]>
Reviewed-by: Claudio Fontana <[e-mail]>
Acked-by: Ilya Leoshkevich <[e-mail]>
Reviewed-by: Fabiano Rosas <[e-mail]>
Message-ID: <[e-mail]>
Signed-off-by: Richard Henderson <[e-mail]>
(cherry picked from commit 8bded2e73e80823a67f730140788a3c5e60bf4b5)
Signed-off-by: Michael Tokarev <[e-mail]>

Patch

diff --git a/target/ppc/translate/vsx-impl.c.inc b/target/ppc/translate/vsx-impl.c.inc
index de1709809d..9e10291010 100644
--- a/target/ppc/translate/vsx-impl.c.inc
+++ b/target/ppc/translate/vsx-impl.c.inc
@@ -2542,7 +2542,7 @@  static bool do_lstxv_PLS_D(DisasContext *ctx, arg_PLS_D *a,
 
 static bool do_lstxv_X(DisasContext *ctx, arg_X *a, bool store, bool paired)
 {
-    if (paired || a->rt >= 32) {
+    if (paired || a->rt < 32) {
         REQUIRE_VSX(ctx);
     } else {
         REQUIRE_VECTOR(ctx);