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[Qemu-devel] [PATCH 3/3] target/s390x: implement serialization in BRANCH
From: |
Aurelien Jarno |
Subject: |
[Qemu-devel] [PATCH 3/3] target/s390x: implement serialization in BRANCH CONDITION |
Date: |
Tue, 9 May 2017 10:28:00 +0200 |
Signed-off-by: Aurelien Jarno <address@hidden>
---
target/s390x/translate.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/target/s390x/translate.c b/target/s390x/translate.c
index c58c27f8e9..2f07ce2be9 100644
--- a/target/s390x/translate.c
+++ b/target/s390x/translate.c
@@ -1517,6 +1517,21 @@ static ExitStatus op_bc(DisasContext *s, DisasOps *o)
int imm = is_imm ? get_field(s->fields, i2) : 0;
DisasCompare c;
+ /* BCR with R2 = 0 causes no branching */
+ if (have_field(s->fields, r2) && get_field(s->fields, r2) == 0) {
+ if (m1 == 14) {
+ /* Perform serialization */
+ /* FIXME: check for fast-BCR-serialization facility */
+ tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC);
+ }
+ if (m1 == 15) {
+ /* Perform serialization */
+ /* FIXME: perform checkpoint-synchronisation */
+ tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC);
+ }
+ return NO_EXIT;
+ }
+
disas_jcc(s, &c, m1);
return help_branch(s, &c, is_imm, imm, o->in2);
}
--
2.11.0