target/mips: Move IEEE rounding mode array to new source file

restore_msa_fp_status() is declared inlined in fpu_helper.h,
and uses the ieee_rm[] array. Therefore any code calling
restore_msa_fp_status() must have access to this ieee_rm[] array.

kvm_mips_get_fpu_registers(), which is in target/mips/kvm.c,
calls restore_msa_fp_status.

Except this tiny array, the rest of fpu_helper.c is only useful
for the TCG accelerator.

To be able to restrict fpu_helper.c to TCG, we need to move the
ieee_rm[] array to a new source file.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210428170410.479308-3-f4bug@amsat.org>

target/mips/fpu.c

+/*
+ * Helpers for emulation of FPU-related MIPS instructions.
+ *
+ *  Copyright (C) 2004-2005  Jocelyn Mayer
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+#include "qemu/osdep.h"
+#include "fpu/softfloat-helpers.h"
+#include "fpu_helper.h"
+
+/* convert MIPS rounding mode in FCR31 to IEEE library */
+const FloatRoundMode ieee_rm[4] = {
+    float_round_nearest_even,
+    float_round_to_zero,
+    float_round_up,
+    float_round_down
+};

target/mips/fpu_helper.c

@@ -38,14 +38,6 @@
 #define FP_TO_INT32_OVERFLOW 0x7fffffff
 #define FP_TO_INT64_OVERFLOW 0x7fffffffffffffffULL
 
-/* convert MIPS rounding mode in FCR31 to IEEE library */
-const FloatRoundMode ieee_rm[4] = {
-    float_round_nearest_even,
-    float_round_to_zero,
-    float_round_up,
-    float_round_down
-};
-
 target_ulong helper_cfc1(CPUMIPSState *env, uint32_t reg)
 {
     target_ulong arg1 = 0;

target/mips/meson.build

@@ -9,6 +9,7 @@ gen = [
 mips_ss = ss.source_set()
 mips_ss.add(files(
   'cpu.c',
+  'fpu.c',
   'gdbstub.c',
 ))
 mips_tcg_ss = ss.source_set()