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[PATCH 2/3] target/ppc: Fix embedded memory barriers


From: Nicholas Piggin
Subject: [PATCH 2/3] target/ppc: Fix embedded memory barriers
Date: Wed, 1 May 2024 23:04:33 +1000

Memory barriers are supposed to do something on BookE systems, these
were probably just missed during MTTCG enablement, maybe no targets
support SMP. Either way, add proper BookE implementations.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 target/ppc/translate/misc-impl.c.inc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/ppc/translate/misc-impl.c.inc 
b/target/ppc/translate/misc-impl.c.inc
index f58bf8b848..9226467f81 100644
--- a/target/ppc/translate/misc-impl.c.inc
+++ b/target/ppc/translate/misc-impl.c.inc
@@ -34,8 +34,7 @@ static bool trans_SYNC(DisasContext *ctx, arg_X_sync *a)
      */
     if (!(ctx->insns_flags & PPC_MEM_SYNC)) {
         if (ctx->insns_flags & PPC_BOOKE) {
-            /* msync replaces sync on 440, interpreted as nop */
-            /* XXX: this also catches e200 */
+            tcg_gen_mb(bar | TCG_BAR_SC);
             return true;
         }
 
@@ -80,6 +79,7 @@ static bool trans_EIEIO(DisasContext *ctx, arg_EIEIO *a)
     if (!(ctx->insns_flags & PPC_MEM_EIEIO)) {
         if ((ctx->insns_flags & PPC_BOOKE) ||
             (ctx->insns_flags2 & PPC2_BOOKE206)) {
+            tcg_gen_mb(bar | TCG_BAR_SC);
             return true;
         }
         return false;
-- 
2.43.0




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