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c7aa8596de
Add generic code to handle PT_GNU_PROPERTY notes. Invalid content is ignored, _dl_process_pt_gnu_property is always called after PT_LOAD segments are mapped and it has no failure modes. Currently only one NT_GNU_PROPERTY_TYPE_0 note is handled, which contains target specific properties: the _dl_process_gnu_property hook is called for each property. The old _dl_process_pt_note and _rtld_process_pt_note differ in how the program header is read. The old _dl_process_pt_note is called before PT_LOAD segments are mapped and _rtld_process_pt_note is called after PT_LOAD segments are mapped. The old _rtld_process_pt_note is removed and _dl_process_pt_note is always called after PT_LOAD segments are mapped and now it has no failure modes. The program headers are scanned backwards so that PT_NOTE can be skipped if PT_GNU_PROPERTY exists. Co-Authored-By: H.J. Lu <hjl.tools@gmail.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/* Support for GNU properties. Generic version.
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Copyright (C) 2018-2020 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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<https://www.gnu.org/licenses/>. */
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#ifndef _DL_PROP_H
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#define _DL_PROP_H
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/* The following functions are used by the dynamic loader and the
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dlopen machinery to process PT_NOTE and PT_GNU_PROPERTY entries in
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the binary or shared object. The notes can be used to change the
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behaviour of the loader, and as such offer a flexible mechanism
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for hooking in various checks related to ABI tags or implementing
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"flag day" ABI transitions. */
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static inline void __attribute__ ((always_inline))
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_rtld_main_check (struct link_map *m, const char *program)
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{
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}
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static inline void __attribute__ ((always_inline))
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_dl_open_check (struct link_map *m)
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{
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}
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static inline void __attribute__ ((always_inline))
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_dl_process_pt_note (struct link_map *l, const ElfW(Phdr) *ph)
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{
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}
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/* Called for each property in the NT_GNU_PROPERTY_TYPE_0 note of L,
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processing of the properties continues until this returns 0. */
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static inline int __attribute__ ((always_inline))
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_dl_process_gnu_property (struct link_map *l, uint32_t type, uint32_t datasz,
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void *data)
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{
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return 0;
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}
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#endif /* _DL_PROP_H */
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