diff -r e6347e559e8f src/sim/syscall_emul.hh
--- a/src/sim/syscall_emul.hh	Tue Feb 19 12:57:47 2013 -0500
+++ b/src/sim/syscall_emul.hh	Fri Feb 22 11:42:58 2013 -0600
@@ -753,8 +753,10 @@
     uint64_t new_length = process->getSyscallArg(tc, index);
     uint64_t flags = process->getSyscallArg(tc, index);
 
-    if ((start % TheISA::VMPageSize != 0) ||
-            (new_length % TheISA::VMPageSize != 0)) {
+    new_length += (TheISA::VMPageSize - 1);
+    new_length &= ~(TheISA::VMPageSize - 1);
+
+    if ((start % TheISA::VMPageSize != 0)) {
         warn("mremap failing: arguments not page aligned");
         return -EINVAL;
     }
@@ -1086,7 +1088,7 @@
     index++; // int prot = p->getSyscallArg(tc, index);
     int flags = p->getSyscallArg(tc, index);
     int tgt_fd = p->getSyscallArg(tc, index);
-    // int offset = p->getSyscallArg(tc, index);
+    int offset = p->getSyscallArg(tc, index);
 
     if (length > 0x100000000ULL)
         warn("mmap length argument %#x is unreasonably large.\n", length);
@@ -1107,11 +1109,14 @@
         }
     }
 
+    length += (TheISA::VMPageSize - 1);
+    length &= ~(TheISA::VMPageSize - 1);
+
     if ((start  % TheISA::VMPageSize) != 0 ||
-        (length % TheISA::VMPageSize) != 0) {
+        (offset % TheISA::VMPageSize) != 0) {
         warn("mmap failing: arguments not page-aligned: "
-             "start 0x%x length 0x%x",
-             start, length);
+             "start 0x%x offset 0x%x",
+             start, offset);
         return -EINVAL;
     }