PPC: BookE: Support 32 and 64 bit wide MAS2

The MAS registers on BookE are all 32 bit wide, except for MAS2, which
can hold up to 64 bit on 64 bit capable CPUs. Reflect this in the SPR
setting code, so that the guest can never write invalid values in them.

Signed-off-by: Alexander Graf <agraf@suse.de>

target-ppc/translate_init.c

@@ -86,6 +86,19 @@ static void spr_write_generic (void *opaque, int sprn, int gprn)
 }
 
 #if !defined(CONFIG_USER_ONLY)
+static void spr_write_generic32(void *opaque, int sprn, int gprn)
+{
+#ifdef TARGET_PPC64
+    TCGv t0 = tcg_temp_new();
+    tcg_gen_ext32u_tl(t0, cpu_gpr[gprn]);
+    gen_store_spr(sprn, t0);
+    tcg_temp_free(t0);
+    spr_store_dump_spr(sprn);
+#else
+    spr_write_generic(opaque, sprn, gprn);
+#endif
+}
+
 static void spr_write_clear (void *opaque, int sprn, int gprn)
 {
     TCGv t0 = tcg_temp_new();
@@ -1597,10 +1610,14 @@ static void gen_spr_BookE206(CPUPPCState *env, uint32_t mas_mask,
     /* TLB assist registers */
     /* XXX : not implemented */
     for (i = 0; i < 8; i++) {
+        void (*uea_write)(void *o, int sprn, int gprn) = &spr_write_generic32;
+        if (i == 2 && (mas_mask & (1 << i)) && (env->insns_flags & PPC_64B)) {
+            uea_write = &spr_write_generic;
+        }
         if (mas_mask & (1 << i)) {
             spr_register(env, mas_sprn[i], mas_names[i],
                          SPR_NOACCESS, SPR_NOACCESS,
-                         &spr_read_generic, &spr_write_generic,
+                         &spr_read_generic, uea_write,
                          0x00000000);
         }
     }