target/hppa: Fix possible overflow in TLB size calculation

Coverty found that the shift of TARGET_PAGE_SIZE (32-bit type) might
overflow.  Fix it by casting TARGET_PAGE_SIZE to a 64-bit type before
doing the shift (CID 1523902 and CID 1523908).

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <ZU6F/H8CZr3q4pP/@p100>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/hppa/mem_helper.c

@@ -450,7 +450,7 @@ static void itlbt_pa20(CPUHPPAState *env, target_ulong r1,
     int mask_shift;
 
     mask_shift = 2 * (r1 & 0xf);
-    va_size = TARGET_PAGE_SIZE << mask_shift;
+    va_size = (uint64_t)TARGET_PAGE_SIZE << mask_shift;
     va_b &= -va_size;
     va_e = va_b + va_size - 1;
 
@@ -505,7 +505,7 @@ static void ptlb_work(CPUState *cpu, run_on_cpu_data data)
      */
     end = start & 0xf;
     start &= TARGET_PAGE_MASK;
-    end = TARGET_PAGE_SIZE << (2 * end);
+    end = (vaddr)TARGET_PAGE_SIZE << (2 * end);
     end = start + end - 1;
 
     hppa_flush_tlb_range(env, start, end);