target/arm: Extend store_cpu_offset to take field size

Currently we assume all fields are 32-bit.
Prepare for fields of a single byte, using sizeof_field().

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[PMM: use sizeof_field() instead of raw sizeof()]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/translate-a32.h

@@ -61,17 +61,14 @@ static inline TCGv_i32 load_cpu_offset(int offset)
 
 #define load_cpu_field(name) load_cpu_offset(offsetof(CPUARMState, name))
 
-static inline void store_cpu_offset(TCGv_i32 var, int offset)
-{
-    tcg_gen_st_i32(var, cpu_env, offset);
-    tcg_temp_free_i32(var);
-}
+void store_cpu_offset(TCGv_i32 var, int offset, int size);
 
-#define store_cpu_field(var, name) \
-    store_cpu_offset(var, offsetof(CPUARMState, name))
+#define store_cpu_field(var, name)                              \
+    store_cpu_offset(var, offsetof(CPUARMState, name),          \
+                     sizeof_field(CPUARMState, name))
 
 #define store_cpu_field_constant(val, name) \
-    tcg_gen_st_i32(tcg_constant_i32(val), cpu_env, offsetof(CPUARMState, name))
+    store_cpu_field(tcg_constant_i32(val), name)
 
 /* Create a new temporary and set it to the value of a CPU register.  */
 static inline TCGv_i32 load_reg(DisasContext *s, int reg)

target/arm/translate.c

@@ -180,6 +180,25 @@ typedef enum ISSInfo {
     ISSIs16Bit = (1 << 8),
 } ISSInfo;
 
+/*
+ * Store var into env + offset to a member with size bytes.
+ * Free var after use.
+ */
+void store_cpu_offset(TCGv_i32 var, int offset, int size)
+{
+    switch (size) {
+    case 1:
+        tcg_gen_st8_i32(var, cpu_env, offset);
+        break;
+    case 4:
+        tcg_gen_st_i32(var, cpu_env, offset);
+        break;
+    default:
+        g_assert_not_reached();
+    }
+    tcg_temp_free_i32(var);
+}
+
 /* Save the syndrome information for a Data Abort */
 static void disas_set_da_iss(DisasContext *s, MemOp memop, ISSInfo issinfo)
 {
@@ -4852,7 +4871,7 @@ static void do_coproc_insn(DisasContext *s, int cpnum, int is64,
                     tcg_temp_free_i32(tmp);
                 } else {
                     TCGv_i32 tmp = load_reg(s, rt);
-                    store_cpu_offset(tmp, ri->fieldoffset);
+                    store_cpu_offset(tmp, ri->fieldoffset, 4);
                 }
             }
         }