[Qemu-devel] [PATCH v2 08/16] target-s390x: implement TRANSLATE EXTENDED instruction

[Aurelien Jarno <aurelien@aurel32.net>]

It is part of the basic zArchitecture instructions.

Cc: Alexander Graf <agraf@suse.de>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 target-s390x/helper.h      |  1 +
 target-s390x/insn-data.def |  2 ++
 target-s390x/mem_helper.c  | 39 +++++++++++++++++++++++++++++++++++++++
 target-s390x/translate.c   |  9 +++++++++
 4 files changed, 51 insertions(+)

diff --git a/target-s390x/helper.h b/target-s390x/helper.h
index 48b015e..7e048ec 100644
--- a/target-s390x/helper.h
+++ b/target-s390x/helper.h
@@ -77,6 +77,7 @@ DEF_HELPER_FLAGS_3(sqxb, TCG_CALL_NO_WG, i64, env, i64, i64)
 DEF_HELPER_FLAGS_1(cvd, TCG_CALL_NO_RWG_SE, i64, s32)
 DEF_HELPER_FLAGS_4(unpk, TCG_CALL_NO_WG, void, env, i32, i64, i64)
 DEF_HELPER_FLAGS_4(tr, TCG_CALL_NO_WG, void, env, i32, i64, i64)
+DEF_HELPER_4(tre, i64, env, i64, i64, i64)
 DEF_HELPER_4(trt, i32, env, i32, i64, i64)
 DEF_HELPER_4(cksm, i64, env, i64, i64, i64)
 DEF_HELPER_FLAGS_5(calc_cc, TCG_CALL_NO_RWG_SE, i32, env, i32, i64, i64, i64)
diff --git a/target-s390x/insn-data.def b/target-s390x/insn-data.def
index e401754..e638b0b 100644
--- a/target-s390x/insn-data.def
+++ b/target-s390x/insn-data.def
@@ -761,6 +761,8 @@
     C(0xdc00, TR,      SS_a,  Z,   la1, a2, 0, 0, tr, 0)
 /* TRANSLATE AND TEST */
     C(0xdd00, TRT,     SS_a,  Z,   la1, a2, 0, 0, trt, 0)
+/* TRANSLATE EXTENDED */
+    C(0xb2a5, TRE,     RRE,   Z,   0, r2, r1_P, 0, tre, 0)
 
 /* UNPACK */
     /* Really format SS_b, but we pack both lengths into one argument
diff --git a/target-s390x/mem_helper.c b/target-s390x/mem_helper.c
index e19e1aa..30a2a6d 100644
--- a/target-s390x/mem_helper.c
+++ b/target-s390x/mem_helper.c
@@ -804,6 +804,45 @@ void HELPER(tr)(CPUS390XState *env, uint32_t len, uint64_t array,
     }
 }
 
+uint64_t HELPER(tre)(CPUS390XState *env, uint64_t array,
+                     uint64_t len, uint64_t trans)
+{
+    uint8_t end = env->regs[0] & 0xff;
+    uint64_t l = len;
+    uint64_t i;
+
+    if (!(env->psw.mask & PSW_MASK_64)) {
+        array &= 0x7fffffff;
+        l = (uint32_t)l;
+    }
+
+    /* Lest we fail to service interrupts in a timely manner, limit the
+       amount of work we're willing to do.  For now, let's cap at 8k.  */
+    if (l > 0x2000) {
+        l = 0x2000;
+        env->cc_op = 3;
+    } else {
+        env->cc_op = 0;
+    }
+
+    for (i = 0; i < l; i++) {
+        uint8_t byte, new_byte;
+
+        byte = cpu_ldub_data(env, array + i);
+
+        if (byte == end) {
+            env->cc_op = 1;
+            break;
+        }
+
+        new_byte = cpu_ldub_data(env, trans + byte);
+        cpu_stb_data(env, array + i, new_byte);
+    }
+
+    env->retxl = len - i;
+    return array + i;
+}
+
 uint32_t HELPER(trt)(CPUS390XState *env, uint32_t len, uint64_t array,
                      uint64_t trans)
 {
diff --git a/target-s390x/translate.c b/target-s390x/translate.c
index 003598d..c8ef24a 100644
--- a/target-s390x/translate.c
+++ b/target-s390x/translate.c
@@ -3787,6 +3787,15 @@ static ExitStatus op_tr(DisasContext *s, DisasOps *o)
     return NO_EXIT;
 }
 
+static ExitStatus op_tre(DisasContext *s, DisasOps *o)
+{
+    potential_page_fault(s);
+    gen_helper_tre(o->out, cpu_env, o->out, o->out2, o->in2);
+    return_low128(o->out2);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
 static ExitStatus op_trt(DisasContext *s, DisasOps *o)
 {
     TCGv_i32 l = tcg_const_i32(get_field(s->fields, l1));
-- 
2.1.4