65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/* On-demand PLT fixup for shared objects. Stub version.
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Copyright (C) 1995 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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <link.h>
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#include "dynamic-link.h"
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/* This function is not called in the normal way. The PLT jumps here, not
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using a call. */
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void
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_dl_runtime_resolve ()
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{
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struct link_map *l = ???;
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Elf32_Word reloc_offset = ???;
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const Elf32_Sym *const symtab
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= (const Elf32_Sym *) l->l_info[DT_SYMTAB]->d_un.d_ptr;
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const char *strtab
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= ((void *) l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);
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const Elf32_Rel *const reloc = (void *) (l->l_info[DT_JMPREL]->d_un.d_ptr
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+ reloc_offset);
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const Elf32_Sym *definer;
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Elf32_Addr loadbase;
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struct link_map *scope, *real_next;
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/* Look up the symbol's run-time value. */
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real_next = l->l_next;
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if (l->l_info[DT_SYMBOLIC])
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{
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l->l_prev->l_next = real_next;
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l->l_next = _dl_loaded;
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scope = l;
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}
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else
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scope = _dl_loaded;
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definer = &symtab[ELF32_R_SYM (reloc->r_info)];
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loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer, scope);
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/* Restore list frobnication done above for DT_SYMBOLIC. */
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l->l_next = real_next;
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l->l_prev->l_next = l;
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/* Apply the relocation with that value. */
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elf_machine_rel (l->l_addr, l->l_info, reloc, loadbase, definer);
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}
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