[Qemu-devel] [PATCH 02/13] s390x: add ldeb instruction

[Alexander Graf <agraf@suse.de>]

While running perl, we encountered the ldeb instruction to be used,
so we implement it :).

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 target-s390x/helpers.h   |    1 +
 target-s390x/op_helper.c |    9 +++++++++
 target-s390x/translate.c |    4 ++++
 3 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/target-s390x/helpers.h b/target-s390x/helpers.h
index 6ca48eb..01c8d0e 100644
--- a/target-s390x/helpers.h
+++ b/target-s390x/helpers.h
@@ -102,6 +102,7 @@ DEF_HELPER_3(madb, void, i32, i64, i32)
 DEF_HELPER_3(maebr, void, i32, i32, i32)
 DEF_HELPER_3(madbr, void, i32, i32, i32)
 DEF_HELPER_3(msdbr, void, i32, i32, i32)
+DEF_HELPER_2(ldeb, void, i32, i64)
 DEF_HELPER_2(lxdb, void, i32, i64)
 DEF_HELPER_FLAGS_2(tceb, TCG_CALL_PURE, i32, i32, i64)
 DEF_HELPER_FLAGS_2(tcdb, TCG_CALL_PURE, i32, i32, i64)
diff --git a/target-s390x/op_helper.c b/target-s390x/op_helper.c
index cd57678..e594118 100644
--- a/target-s390x/op_helper.c
+++ b/target-s390x/op_helper.c
@@ -1631,6 +1631,15 @@ void HELPER(maebr)(uint32_t f1, uint32_t f3, uint32_t f2)
                                          &env->fpu_status);
 }
 
+/* convert 32-bit float to 64-bit float */
+void HELPER(ldeb)(uint32_t f1, uint64_t a2)
+{
+    uint32_t v2;
+    v2 = ldl(a2);
+    env->fregs[f1].d = float32_to_float64(v2,
+                                          &env->fpu_status);
+}
+
 /* convert 64-bit float to 128-bit float */
 void HELPER(lxdb)(uint32_t f1, uint64_t a2)
 {
diff --git a/target-s390x/translate.c b/target-s390x/translate.c
index 6a22fde..ee15672 100644
--- a/target-s390x/translate.c
+++ b/target-s390x/translate.c
@@ -2214,6 +2214,10 @@ static void disas_ed(DisasContext *s, int op, int r1, int x2, int b2, int d2,
     addr = get_address(s, x2, b2, d2);
     tmp_r1 = tcg_const_i32(r1);
     switch (op) {
+    case 0x4: /* LDEB R1,D2(X2,B2) [RXE] */
+        potential_page_fault(s);
+        gen_helper_ldeb(tmp_r1, addr);
+        break;
     case 0x5: /* LXDB R1,D2(X2,B2) [RXE] */
         potential_page_fault(s);
         gen_helper_lxdb(tmp_r1, addr);
-- 
1.6.0.2