mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-18 02:50:09 +00:00
710f7bab59
* elf/dl-lookup.c (_dl_lookup_symbol): Take new arg RELOC_ADDR and don't allow a defn resolving to that address. * elf/link.h: Update prototype and comment. * elf/dl-runtime.c (fixup): Define local `resolve' function and pass it to elf_machine_relplt. * elf/dl-reloc.c (_dl_relocate_object: resolve): Take new arg RELOC_ADDR and pass it through to _dl_lookup_symbol. * elf/do-rel.h (elf_dynamic_do_rel): Pass RESOLVE to elf_machine_rel instead of calling it ourselves and passing its results. (elf_dynamic_do_rel): RESOLVE fn takes new arg RELOC_ADDR. * elf/rtld.c (dl_main): Pass 0 for RELOC_ADDR to _dl_lookup_symbol. * sysdeps/i386/dl-machine.h (elf_machine_rel): Remove SYM_LOADADDR arg. Add RESOLVE function ptr arg. Call *RESOLVE as necessary. * sysdeps/m68k/dl-machine.h (elf_machine_rela): Likewise. * sysdeps/stub/dl-machine.h: Likewise. * csu/initfini.c (_fini): Add extern decl for i_am_not_a_leaf. * elf/dlfcn.h (dl_open_mode): Enumerated type removed. (RTLD_LAZY, RTLD_NOW): Define these as macros instead. (RTLD_GLOBAL): New macro. (dlopen): Take arg of type int instead of dl_open_mode. * elf/dlopen.c: Likewise. * math/math.h (_Mldbl): New macro, either produces L suffix or not. (M_*): Use it for these constants.
126 lines
4.0 KiB
C
126 lines
4.0 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. Stub version.
|
|
Copyright (C) 1995, 1996 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#define ELF_MACHINE_NAME "stub"
|
|
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include <link.h>
|
|
|
|
|
|
/* Return nonzero iff E_MACHINE is compatible with the running host. */
|
|
static inline int
|
|
elf_machine_matches_host (Elf32_Half e_machine)
|
|
{
|
|
switch (e_machine)
|
|
{
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
/* Return the run-time address of the _GLOBAL_OFFSET_TABLE_. */
|
|
static inline Elf32_Addr *
|
|
elf_machine_got (void)
|
|
{
|
|
#error "GOT not got"
|
|
}
|
|
|
|
|
|
/* Return the run-time load address of the shared object. */
|
|
static inline Elf32_Addr
|
|
elf_machine_load_address (void)
|
|
{
|
|
#error "Where am I?"
|
|
}
|
|
|
|
/* This can modify DYNAMIC_INFO to avoid relocating code in
|
|
the functions above if they are doing bizarre magic. */
|
|
#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) /* nothing */
|
|
|
|
/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
|
|
LOADADDR is the load address of the object; INFO is an array indexed
|
|
by DT_* of the .dynamic section info. */
|
|
|
|
static inline void
|
|
elf_machine_rel (Elf32_Addr loadaddr, Elf32_Dyn *info[DT_NUM],
|
|
const Elf32_Rel *reloc, const Elf32_Sym *sym,
|
|
Elf32_Addr (*resolve) (const Elf32_Sym **ref,
|
|
Elf32_Addr reloc_addr,
|
|
int noplt))
|
|
{
|
|
Elf32_Addr *const reloc_addr = (Elf32_Addr *) reloc->r_offset;
|
|
Elf32_Addr loadbase;
|
|
|
|
switch (ELF32_R_TYPE (reloc->r_info))
|
|
{
|
|
case R_MACHINE_COPY:
|
|
loadbase = (*resolve) (&sym, (Elf32_Addr) reloc_addr, 0);
|
|
memcpy (reloc_addr, (void *) (loadbase + sym->st_value), sym->st_size);
|
|
break;
|
|
default:
|
|
assert (! "unexpected dynamic reloc type");
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static inline void
|
|
elf_machine_rela (Elf32_Addr loadaddr, Elf32_Dyn *info[DT_NUM],
|
|
const Elf32_Rel *reloc, const Elf32_Sym *sym,
|
|
Elf32_Addr (*resolve) (const Elf32_Sym **ref,
|
|
Elf32_Addr reloc_addr,
|
|
int noplt))
|
|
{
|
|
_dl_signal_error (0, "Elf32_Rela relocation requested -- unused on "
|
|
ELF_MACHINE_NAME);
|
|
}
|
|
|
|
|
|
/* Nonzero iff TYPE describes relocation of a PLT entry, so
|
|
PLT entries should not be allowed to define the value. */
|
|
#define elf_machine_pltrel_p(type) ((type) == R_???_JMP_SLOT)
|
|
|
|
|
|
/* Set up the loaded object described by L so its unrelocated PLT
|
|
entries will jump to the on-demand fixup code in dl-runtime.c. */
|
|
|
|
static inline void
|
|
elf_machine_runtime_setup (struct link_map *l)
|
|
{
|
|
extern void _dl_runtime_resolve (Elf32_Word);
|
|
/* The GOT entries for functions in the PLT have not yet been filled
|
|
in. Their initial contents will arrange when called to push an
|
|
offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
|
|
and then jump to _GLOBAL_OFFSET_TABLE[2]. */
|
|
Elf32_Addr *got = (Elf32_Addr *) l->l_info[DT_PLTGOT]->d_un.d_ptr;
|
|
got[1] = (Elf32_Addr) l; /* Identify this shared object. */
|
|
/* This function will get called to fix up the GOT entry indicated by
|
|
the offset on the stack, and then jump to the resolved address. */
|
|
got[2] = (Elf32_Addr) &_dl_runtime_resolve;
|
|
}
|
|
|
|
|
|
/* Initial entry point code for the dynamic linker.
|
|
The C function `_dl_start' is the real entry point;
|
|
its return value is the user program's entry point. */
|
|
|
|
#define RTLD_START #error need some startup code
|