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/* Support for relocating static PIE.
Copyright (C) 2017-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#if ENABLE_STATIC_PIE
/* Mark symbols hidden in static PIE for early self relocation to work. */
# pragma GCC visibility push(hidden)
#include <unistd.h>
#include <ldsodefs.h>
#include "dynamic-link.h"
/* Relocate static executable with PIE. */
void
_dl_relocate_static_pie (void)
{
struct link_map *main_map = _dl_get_dl_main_map ();
# define STATIC_PIE_BOOTSTRAP
# define BOOTSTRAP_MAP (main_map)
# define RESOLVE_MAP(sym, version, flags) BOOTSTRAP_MAP
# include "dynamic-link.h"
/* Figure out the run-time load address of static PIE. */
main_map->l_addr = elf_machine_load_address ();
/* Read our own dynamic section and fill in the info array. */
main_map->l_ld = ((void *) main_map->l_addr + elf_machine_dynamic ());
const ElfW(Phdr) *ph, *phdr = GL(dl_phdr);
size_t phnum = GL(dl_phnum);
for (ph = phdr; ph < &phdr[phnum]; ++ph)
if (ph->p_type == PT_DYNAMIC)
{
main_map->l_ld_readonly = (ph->p_flags & PF_W) == 0;
break;
}
elf_get_dynamic_info (main_map);
# ifdef ELF_MACHINE_BEFORE_RTLD_RELOC
ELF_MACHINE_BEFORE_RTLD_RELOC (main_map->l_info);
# endif
/* Relocate ourselves so we can do normal function calls and
data access using the global offset table. */
ELF_DYNAMIC_RELOCATE (main_map, 0, 0, 0);
main_map->l_relocated = 1;
/* Initialize _r_debug_extended. */
struct r_debug *r = _dl_debug_initialize (0, LM_ID_BASE);
r->r_state = RT_CONSISTENT;
/* Set up debugging before the debugger is notified for the first
time. */
# ifdef ELF_MACHINE_DEBUG_SETUP
/* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */
ELF_MACHINE_DEBUG_SETUP (main_map, r);
# else
if (main_map->l_info[DT_DEBUG] != NULL)
/* There is a DT_DEBUG entry in the dynamic section. Fill it in
with the run-time address of the r_debug structure */
main_map->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
# endif
}
#endif
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