171 lines
6.2 KiB
C
171 lines
6.2 KiB
C
/* Inline functions for dynamic linking.
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Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <elf.h>
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#include <dl-machine.h>
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#include <assert.h>
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/* Global read-only variable defined in rtld.c which is nonzero if we
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shall give more warning messages. */
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extern int _dl_verbose __attribute__ ((unused));
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/* Read the dynamic section at DYN and fill in INFO with indices DT_*. */
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static inline void __attribute__ ((unused))
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elf_get_dynamic_info (ElfW(Dyn) *dyn,
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ElfW(Dyn) *info[DT_NUM + DT_PROCNUM + DT_VERSIONTAGNUM
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+ DT_EXTRANUM])
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{
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unsigned int i;
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for (i = 0; i < DT_NUM + DT_PROCNUM + DT_VERSIONTAGNUM + DT_EXTRANUM; ++i)
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info[i] = NULL;
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if (! dyn)
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return;
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while (dyn->d_tag != DT_NULL)
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{
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if (dyn->d_tag < DT_NUM)
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info[dyn->d_tag] = dyn;
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else if (dyn->d_tag >= DT_LOPROC &&
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dyn->d_tag < DT_LOPROC + DT_PROCNUM)
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info[dyn->d_tag - DT_LOPROC + DT_NUM] = dyn;
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else if ((Elf32_Word) DT_VERSIONTAGIDX (dyn->d_tag) < DT_VERSIONTAGNUM)
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info[DT_VERSIONTAGIDX (dyn->d_tag) + DT_NUM + DT_PROCNUM] = dyn;
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else if ((Elf32_Word) DT_EXTRATAGIDX (dyn->d_tag) < DT_EXTRANUM)
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info[DT_EXTRATAGIDX (dyn->d_tag) + DT_NUM + DT_PROCNUM
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+ DT_VERSIONTAGNUM] = dyn;
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else
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assert (! "bad dynamic tag");
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++dyn;
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}
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if (info[DT_RELA])
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assert (info[DT_RELAENT]->d_un.d_val == sizeof (ElfW(Rela)));
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if (info[DT_REL])
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assert (info[DT_RELENT]->d_un.d_val == sizeof (ElfW(Rel)));
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if (info[DT_PLTREL])
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assert (info[DT_PLTREL]->d_un.d_val == DT_REL ||
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info[DT_PLTREL]->d_un.d_val == DT_RELA);
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}
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#ifdef RESOLVE
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/* Get the definitions of `elf_dynamic_do_rel' and `elf_dynamic_do_rela'.
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These functions are almost identical, so we use cpp magic to avoid
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duplicating their code. It cannot be done in a more general function
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because we must be able to completely inline. */
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/* On some machines, notably Sparc, DT_REL* includes DT_JMPREL in its
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range. Note that according to the ELF spec, this is completely legal!
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But conditionally define things so that on machines we know this will
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not happen we do something more optimal. */
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#ifdef ELF_MACHINE_PLTREL_OVERLAP
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#define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, lazy) \
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do { \
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ElfW(Addr) r_addr, r_size, p_addr, p_size; \
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if ((map)->l_info[DT_##RELOC]) \
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{ \
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r_addr = (map)->l_info[DT_##RELOC]->d_un.d_ptr; \
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r_size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \
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if ((map)->l_info[DT_PLTREL] && \
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(map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC) \
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{ \
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p_addr = (map)->l_info[DT_JMPREL]->d_un.d_ptr; \
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p_size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \
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if (r_addr <= p_addr && r_addr+r_size > p_addr) \
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{ \
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ElfW(Addr) r2_addr, r2_size; \
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r2_addr = p_addr + p_size; \
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if (r2_addr < r_addr + r_size) \
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{ \
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r2_size = r_addr + r_size - r2_addr; \
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elf_dynamic_do_##reloc ((map), r2_addr, r2_size, 0); \
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} \
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r_size = p_addr - r_addr; \
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} \
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} \
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\
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elf_dynamic_do_##reloc ((map), r_addr, r_size, 0); \
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if (p_addr) \
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elf_dynamic_do_##reloc ((map), p_addr, p_size, (lazy)); \
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} \
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else if ((map)->l_info[DT_PLTREL] && \
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(map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC) \
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{ \
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p_addr = (map)->l_info[DT_JMPREL]->d_un.d_ptr; \
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p_size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \
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\
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elf_dynamic_do_##reloc ((map), p_addr, p_size, (lazy)); \
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} \
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} while (0)
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#else
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#define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, lazy) \
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do { \
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if ((map)->l_info[DT_##RELOC]) \
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{ \
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ElfW(Addr) r_addr, r_size; \
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r_addr = (map)->l_info[DT_##RELOC]->d_un.d_ptr; \
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r_size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \
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elf_dynamic_do_##reloc ((map), r_addr, r_size, 0); \
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} \
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if ((map)->l_info[DT_PLTREL] && \
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(map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC) \
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{ \
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ElfW(Addr) p_addr, p_size; \
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p_addr = (map)->l_info[DT_JMPREL]->d_un.d_ptr; \
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p_size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \
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elf_dynamic_do_##reloc ((map), p_addr, p_size, (lazy)); \
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} \
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} while (0)
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#endif
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#if ! ELF_MACHINE_NO_REL
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#include "do-rel.h"
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#define ELF_DYNAMIC_DO_REL(map, lazy) \
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_ELF_DYNAMIC_DO_RELOC (REL, rel, map, lazy)
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#else
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#define ELF_DYNAMIC_DO_REL(map, lazy) /* Nothing to do. */
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#endif
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#if ! ELF_MACHINE_NO_RELA
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#define DO_RELA
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#include "do-rel.h"
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#define ELF_DYNAMIC_DO_RELA(map, lazy) \
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_ELF_DYNAMIC_DO_RELOC (RELA, rela, map, lazy)
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#else
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#define ELF_DYNAMIC_DO_RELA(map, lazy) /* Nothing to do. */
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#endif
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/* This can't just be an inline function because GCC is too dumb
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to inline functions containing inlines themselves. */
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#define ELF_DYNAMIC_RELOCATE(map, lazy, consider_profile) \
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do { \
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int edr_lazy = elf_machine_runtime_setup ((map), (lazy), \
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(consider_profile)); \
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ELF_DYNAMIC_DO_REL ((map), edr_lazy); \
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ELF_DYNAMIC_DO_RELA ((map), edr_lazy); \
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} while (0)
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#endif
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