66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/* Unmap a shared object's segments. NaCl version.
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Copyright (C) 2015-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _DL_UNMAP_SEGMENTS_H
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#define _DL_UNMAP_SEGMENTS_H 1
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#include <link.h>
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#include <sys/mman.h>
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/* There is always a big gap between the executable segment and the data
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segments. Other code segments and data pages lie in there. So we must
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unmap each segment individually (except for a codeless module). */
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static void __always_inline
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_dl_unmap_segments (struct link_map *l)
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{
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if (l->l_contiguous)
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/* Simple case. */
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__munmap ((void *) l->l_map_start, l->l_map_end - l->l_map_start);
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else
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{
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/* Normally l_phdr points into the RODATA segment, which we will
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unmap in one iteration of the loop. So we cannot use it directly
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throughout. */
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struct { ElfW(Addr) start, end; } segments[l->l_phnum], *seg = segments;
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for (const ElfW(Phdr) *ph = l->l_phdr; ph < &l->l_phdr[l->l_phnum]; ++ph)
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if (ph->p_type == PT_LOAD)
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{
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seg->start = (l->l_addr + ph->p_vaddr) & -GLRO(dl_pagesize);
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seg->end = (l->l_addr + ph->p_vaddr + ph->p_memsz
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+ GLRO(dl_pagesize) - 1) & -GLRO(dl_pagesize);
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if (seg > segments && seg[-1].end == seg->start)
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/* Coalesce two adjacent segments into one munmap call. */
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seg[-1].end = seg->end;
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else
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++seg;
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}
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do
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{
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--seg;
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__munmap ((void *) seg->start, seg->end - seg->start);
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}
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while (seg > segments);
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}
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}
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#endif /* dl-unmap-segments.h */
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