The semantics of these operations changed. Let's implement them just
like LOAD AND ADD, so they are atomic.
This fixes random crashes when booting a Linux kernel compiled for
z196+ with SMP + MTTCG.
Signed-off-by: David Hildenbrand <da...@redhat.com>
---
target/s390x/insn-data.def | 4 ++--
target/s390x/translate.c | 11 +++++++++++
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index 43ab1963c8..57f2e5133f 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -39,10 +39,10 @@
C(0xb9d8, AHHLR, RRF_a, HW, r2_sr32, r3, new, r1_32h, add, adds32)
/* ADD IMMEDIATE */
C(0xc209, AFI, RIL_a, EI, r1, i2, new, r1_32, add, adds32)
- C(0xeb6a, ASI, SIY, GIE, m1_32s, i2, new, m1_32, add, adds32)
+ D(0xeb6a, ASI, SIY, GIE, la1, i2, new, 0, asi, adds32, MO_TESL)
C(0xecd8, AHIK, RIE_d, DO, r3, i2, new, r1_32, add, adds32)
C(0xc208, AGFI, RIL_a, EI, r1, i2, r1, 0, add, adds64)
- C(0xeb7a, AGSI, SIY, GIE, m1_64, i2, new, m1_64, add, adds64)
+ D(0xeb7a, AGSI, SIY, GIE, la1, i2, new, 0, asi, adds64, MO_TEQ)
C(0xecd9, AGHIK, RIE_d, DO, r3, i2, r1, 0, add, adds64)
/* ADD IMMEDIATE HIGH */
C(0xcc08, AIH, RIL_a, HW, r1_sr32, i2, new, r1_32h, add, adds32)
diff --git a/target/s390x/translate.c b/target/s390x/translate.c
index 5e051fdd03..79d2ee650c 100644
--- a/target/s390x/translate.c
+++ b/target/s390x/translate.c
@@ -1364,6 +1364,17 @@ static ExitStatus op_addc(DisasContext *s, DisasOps *o)
return NO_EXIT;
}
+static ExitStatus op_asi(DisasContext *s, DisasOps *o)
+{
+ o->in1 = tcg_temp_new_i64();
+ /* Perform the atomic addition in memory. */
+ tcg_gen_atomic_fetch_add_i64(o->in1, o->addr1, o->in2, get_mem_index(s),
+ s->insn->data);
+ /* However, we need to recompute the addition for setting CC. */
+ tcg_gen_add_i64(o->out, o->in1, o->in2);
+ return NO_EXIT;
+}
+
static ExitStatus op_aeb(DisasContext *s, DisasOps *o)
{
gen_helper_aeb(o->out, cpu_env, o->in1, o->in2);
--
2.14.3
