Teach mmap to not overwrite reserved pages and fix brk return value (Richard Purdie).

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4255 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 5 insertions, 6 deletions

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index b1dc365e6e..3946d61b67 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -420,7 +420,7 @@ abi_long do_brk(abi_ulong new_brk)
     if (!new_brk)
         return target_brk;
     if (new_brk < target_original_brk)
-        return -TARGET_ENOMEM;
+        return target_brk;
 
     brk_page = HOST_PAGE_ALIGN(target_brk);
 
@@ -435,12 +435,11 @@ abi_long do_brk(abi_ulong new_brk)
     mapped_addr = get_errno(target_mmap(brk_page, new_alloc_size,
                                         PROT_READ|PROT_WRITE,
                                         MAP_ANON|MAP_FIXED|MAP_PRIVATE, 0, 0));
-    if (is_error(mapped_addr)) {
-	return mapped_addr;
-    } else {
+
+    if (!is_error(mapped_addr))
 	target_brk = new_brk;
-    	return target_brk;
-    }
+    
+    return target_brk;
 }
 
 static inline abi_long copy_from_user_fdset(fd_set *fds,