[PATCH-for-5.0 v2 1/2] gdbstub: Introduce gdb_get_float32() to get 32-bit float registers

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Since we now use a GByteArray, we can not use stfl_p() directly.
Introduce the gdb_get_float32() helper to load a float32 register.

Fixes: a010bdbe719 ("extend GByteArray to read register helpers")
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/exec/gdbstub.h | 12 ++++++++++++
 target/sh4/gdbstub.c   |  6 ++----
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
index b52d9933ee..3caca99416 100644
--- a/include/exec/gdbstub.h
+++ b/include/exec/gdbstub.h
@@ -125,6 +125,18 @@ static inline int gdb_get_reg128(GByteArray *buf, uint64_t val_hi,
     return 16;
 }
 
+static inline int gdb_get_float32(GByteArray *array, float32 val)
+{
+    uint8_t buf[4];
+
+    QEMU_BUILD_BUG_ON(sizeof(CPU_FloatU) != sizeof(buf));
+
+    stfl_p(buf, val);
+    g_byte_array_append(array, buf, sizeof(buf));
+
+    return sizeof(buf);
+}
+
 static inline int gdb_get_zeroes(GByteArray *array, size_t len)
 {
     for (size_t i = 0; i < len; i++) {
diff --git a/target/sh4/gdbstub.c b/target/sh4/gdbstub.c
index 49fc4a0cc6..34ad3ca050 100644
--- a/target/sh4/gdbstub.c
+++ b/target/sh4/gdbstub.c
@@ -58,11 +58,9 @@ int superh_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
         return gdb_get_regl(mem_buf, env->fpscr);
     case 25 ... 40:
         if (env->fpscr & FPSCR_FR) {
-            stfl_p(mem_buf, env->fregs[n - 9]);
-        } else {
-            stfl_p(mem_buf, env->fregs[n - 25]);
+            return gdb_get_float32(mem_buf, env->fregs[n - 9]);
         }
-        return 4;
+        return gdb_get_float32(mem_buf, env->fregs[n - 25]);
     case 41:
         return gdb_get_regl(mem_buf, env->ssr);
     case 42:
-- 
2.21.1