target/hppa: ignore DIAG opcode

DIAG is usually only used by diagnostics software as it's CPU
specific. In most of the cases it's better to ignore it and log
a message that it's not implemented.
Signed-off-by: NSven Schnelle <svens@stackframe.org>
Message-Id: <20190311191602.25796-7-svens@stackframe.org>
[rth: Free the nullify condition.]
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

target/hppa/insns.decode

@@ -525,3 +525,6 @@ fmpy_d          001110 ..... ..... 010 ..... ... .....  @f0e_d_3
 fdiv_d          001110 ..... ..... 011 ..... ... .....  @f0e_d_3
 
 xmpyu           001110 ..... ..... 010 .0111 .00 t:5    r1=%ra64 r2=%rb64
+
+# diag
+diag            000101 ----- ----- ---- ---- ---- ----

target/hppa/translate.c

@@ -4048,6 +4048,13 @@ static bool trans_fmpyfadd_d(DisasContext *ctx, arg_fmpyfadd_d *a)
     return nullify_end(ctx);
 }
 
+static bool trans_diag(DisasContext *ctx, arg_diag *a)
+{
+    qemu_log_mask(LOG_UNIMP, "DIAG opcode ignored\n");
+    cond_free(&ctx->null_cond);
+    return true;
+}
+
 static void hppa_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
 {
     DisasContext *ctx = container_of(dcbase, DisasContext, base);