1 files changed, 65 insertions, 0 deletions
diff --git a/sysdeps/nacl/dl-unmap-segments.h b/sysdeps/nacl/dl-unmap-segments.h
new file mode 100644
index 0000000000..02851e7dc3
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+++ b/sysdeps/nacl/dl-unmap-segments.h
@@ -0,0 +1,65 @@
+/* Unmap a shared object's segments.  NaCl version.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _DL_UNMAP_SEGMENTS_H
+#define _DL_UNMAP_SEGMENTS_H    1
+
+#include <link.h>
+#include <sys/mman.h>
+
+/* There is always a big gap between the executable segment and the data
+   segments.  Other code segments and data pages lie in there.  So we must
+   unmap each segment individually (except for a codeless module).  */
+
+static void __always_inline
+_dl_unmap_segments (struct link_map *l)
+{
+  if (l->l_contiguous)
+    /* Simple case.  */
+    __munmap ((void *) l->l_map_start, l->l_map_end - l->l_map_start);
+  else
+    {
+      /* Normally l_phdr points into the RODATA segment, which we will
+         unmap in one iteration of the loop.  So we cannot use it directly
+         throughout.  */
+
+      struct { ElfW(Addr) start, end; } segments[l->l_phnum], *seg = segments;
+
+      for (const ElfW(Phdr) *ph = l->l_phdr; ph < &l->l_phdr[l->l_phnum]; ++ph)
+        if (ph->p_type == PT_LOAD)
+          {
+            seg->start = (l->l_addr + ph->p_vaddr) & -GLRO(dl_pagesize);
+            seg->end = (l->l_addr + ph->p_vaddr + ph->p_memsz
+                        + GLRO(dl_pagesize) - 1) & -GLRO(dl_pagesize);
+            if (seg > segments && seg[-1].end == seg->start)
+              /* Coalesce two adjacent segments into one munmap call.  */
+              seg[-1].end = seg->end;
+            else
+              ++seg;
+          }
+
+      do
+        {
+          --seg;
+          __munmap ((void *) seg->start, seg->end - seg->start);
+        }
+      while (seg > segments);
+    }
+}
+
+#endif  /* dl-unmap-segments.h */