suppressed page_unprotect_range() - fixed access_ok()

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3641 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 12 insertions, 18 deletions

diff --git a/exec.c b/exec.c
index e817a4e5e..6384df270 100644
--- a/exec.c
+++ b/exec.c
@@ -1894,10 +1894,19 @@ int page_check_range(target_ulong start, target_ulong len, int flags)
         if( !(p->flags & PAGE_VALID) )
             return -1;
 
-        if (!(p->flags & PAGE_READ) && (flags & PAGE_READ) )
-            return -1;
-        if (!(p->flags & PAGE_WRITE) && (flags & PAGE_WRITE) )
+        if ((flags & PAGE_READ) && !(p->flags & PAGE_READ))
             return -1;
+        if (flags & PAGE_WRITE) {
+            if (!(p->flags & PAGE_WRITE_ORG))
+                return -1;
+            /* unprotect the page if it was put read-only because it
+               contains translated code */
+            if (!(p->flags & PAGE_WRITE)) {
+                if (!page_unprotect(addr, 0, NULL))
+                    return -1;
+            }
+            return 0;
+        }
     }
     return 0;
 }
@@ -1942,21 +1951,6 @@ int page_unprotect(target_ulong address, unsigned long pc, void *puc)
     return 0;
 }
 
-/* call this function when system calls directly modify a memory area */
-/* ??? This should be redundant now we have lock_user.  */
-void page_unprotect_range(target_ulong data, target_ulong data_size)
-{
-    target_ulong start, end, addr;
-
-    start = data;
-    end = start + data_size;
-    start &= TARGET_PAGE_MASK;
-    end = TARGET_PAGE_ALIGN(end);
-    for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
-        page_unprotect(addr, 0, NULL);
-    }
-}
-
 static inline void tlb_set_dirty(CPUState *env,
                                  unsigned long addr, target_ulong vaddr)
 {