target/loongarch: Update loongarch-fpu.xml

Rename loongarch-fpu64.xml to loongarch-fpu.xml and update
loongarch-fpu.xml to match upstream GDB [1]

[1]:https://github.com/bminor/binutils-gdb/blob/master/gdb/features/loongarch/fpu.xml

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220805033523.1416837-5-gaosong@loongson.cn>

configs/targets/loongarch64-softmmu.mak

@@ -1,5 +1,5 @@
 TARGET_ARCH=loongarch64
 TARGET_BASE_ARCH=loongarch
 TARGET_SUPPORTS_MTTCG=y
-TARGET_XML_FILES= gdb-xml/loongarch-base64.xml gdb-xml/loongarch-fpu64.xml
+TARGET_XML_FILES= gdb-xml/loongarch-base64.xml gdb-xml/loongarch-fpu.xml
 TARGET_NEED_FDT=y

gdb-xml/loongarch-fpu.xml

@@ -0,0 +1,50 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2021 Free Software Foundation, Inc.
+
+     Copying and distribution of this file, with or without modification,
+     are permitted in any medium without royalty provided the copyright
+     notice and this notice are preserved.  -->
+
+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
+<feature name="org.gnu.gdb.loongarch.fpu">
+
+  <union id="fputype">
+    <field name="f" type="ieee_single"/>
+    <field name="d" type="ieee_double"/>
+  </union>
+
+  <reg name="f0" bitsize="64" type="fputype" group="float"/>
+  <reg name="f1" bitsize="64" type="fputype" group="float"/>
+  <reg name="f2" bitsize="64" type="fputype" group="float"/>
+  <reg name="f3" bitsize="64" type="fputype" group="float"/>
+  <reg name="f4" bitsize="64" type="fputype" group="float"/>
+  <reg name="f5" bitsize="64" type="fputype" group="float"/>
+  <reg name="f6" bitsize="64" type="fputype" group="float"/>
+  <reg name="f7" bitsize="64" type="fputype" group="float"/>
+  <reg name="f8" bitsize="64" type="fputype" group="float"/>
+  <reg name="f9" bitsize="64" type="fputype" group="float"/>
+  <reg name="f10" bitsize="64" type="fputype" group="float"/>
+  <reg name="f11" bitsize="64" type="fputype" group="float"/>
+  <reg name="f12" bitsize="64" type="fputype" group="float"/>
+  <reg name="f13" bitsize="64" type="fputype" group="float"/>
+  <reg name="f14" bitsize="64" type="fputype" group="float"/>
+  <reg name="f15" bitsize="64" type="fputype" group="float"/>
+  <reg name="f16" bitsize="64" type="fputype" group="float"/>
+  <reg name="f17" bitsize="64" type="fputype" group="float"/>
+  <reg name="f18" bitsize="64" type="fputype" group="float"/>
+  <reg name="f19" bitsize="64" type="fputype" group="float"/>
+  <reg name="f20" bitsize="64" type="fputype" group="float"/>
+  <reg name="f21" bitsize="64" type="fputype" group="float"/>
+  <reg name="f22" bitsize="64" type="fputype" group="float"/>
+  <reg name="f23" bitsize="64" type="fputype" group="float"/>
+  <reg name="f24" bitsize="64" type="fputype" group="float"/>
+  <reg name="f25" bitsize="64" type="fputype" group="float"/>
+  <reg name="f26" bitsize="64" type="fputype" group="float"/>
+  <reg name="f27" bitsize="64" type="fputype" group="float"/>
+  <reg name="f28" bitsize="64" type="fputype" group="float"/>
+  <reg name="f29" bitsize="64" type="fputype" group="float"/>
+  <reg name="f30" bitsize="64" type="fputype" group="float"/>
+  <reg name="f31" bitsize="64" type="fputype" group="float"/>
+  <reg name="fcc" bitsize="64" type="uint64" group="float"/>
+  <reg name="fcsr" bitsize="32" type="uint32" group="float"/>
+</feature>

target/loongarch/gdbstub.c

@@ -80,5 +80,5 @@ static int loongarch_gdb_set_fpu(CPULoongArchState *env,
 void loongarch_cpu_register_gdb_regs_for_features(CPUState *cs)
 {
     gdb_register_coprocessor(cs, loongarch_gdb_get_fpu, loongarch_gdb_set_fpu,
-                             41, "loongarch-fpu64.xml", 0);
+                             41, "loongarch-fpu.xml", 0);
 }