Add tb_page_addr_t

The page tracking code in exec.c is used by both userspace and system
emulation.  Userspace emulation uses it to track virtual pages, and
system emulation to track ram pages.  Introduce a new type to hold this
kind of address.

Signed-off-by: Paul Brook <paul@codesourcery.com>
diff --git a/cpu-exec.c b/cpu-exec.c
index 5d6dd51..bcfcda2 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -125,12 +125,13 @@
 {
     TranslationBlock *tb, **ptb1;
     unsigned int h;
-    target_ulong phys_pc, phys_page1, phys_page2, virt_page2;
+    tb_page_addr_t phys_pc, phys_page1, phys_page2;
+    target_ulong virt_page2;
 
     tb_invalidated_flag = 0;
 
     /* find translated block using physical mappings */
-    phys_pc = get_phys_addr_code(env, pc);
+    phys_pc = get_page_addr_code(env, pc);
     phys_page1 = phys_pc & TARGET_PAGE_MASK;
     phys_page2 = -1;
     h = tb_phys_hash_func(phys_pc);
@@ -147,7 +148,7 @@
             if (tb->page_addr[1] != -1) {
                 virt_page2 = (pc & TARGET_PAGE_MASK) +
                     TARGET_PAGE_SIZE;
-                phys_page2 = get_phys_addr_code(env, virt_page2);
+                phys_page2 = get_page_addr_code(env, virt_page2);
                 if (tb->page_addr[1] == phys_page2)
                     goto found;
             } else {