1 /* Unmap a shared object's segments. NaCl version.
2 Copyright (C) 2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #ifndef _DL_UNMAP_SEGMENTS_H
20 #define _DL_UNMAP_SEGMENTS_H 1
25 /* There is always a big gap between the executable segment and the data
26 segments. Other code segments and data pages lie in there. So we must
27 unmap each segment individually (except for a codeless module). */
29 static void __always_inline
30 _dl_unmap_segments (struct link_map
*l
)
34 __munmap ((void *) l
->l_map_start
, l
->l_map_end
- l
->l_map_start
);
37 /* Normally l_phdr points into the RODATA segment, which we will
38 unmap in one iteration of the loop. So we cannot use it directly
41 struct { ElfW(Addr
) start
, end
; } segments
[l
->l_phnum
], *seg
= segments
;
43 for (const ElfW(Phdr
) *ph
= l
->l_phdr
; ph
< &l
->l_phdr
[l
->l_phnum
]; ++ph
)
44 if (ph
->p_type
== PT_LOAD
)
46 seg
->start
= (l
->l_addr
+ ph
->p_vaddr
) & -GLRO(dl_pagesize
);
47 seg
->end
= (l
->l_addr
+ ph
->p_vaddr
+ ph
->p_memsz
48 + GLRO(dl_pagesize
) - 1) & -GLRO(dl_pagesize
);
49 if (seg
> segments
&& seg
[-1].end
== seg
->start
)
50 /* Coalesce two adjacent segments into one munmap call. */
51 seg
[-1].end
= seg
->end
;
59 __munmap ((void *) seg
->start
, seg
->end
- seg
->start
);
61 while (seg
> segments
);
65 #endif /* dl-unmap-segments.h */