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glibc/sysdeps/generic/dl-machine.h
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/* Machine-dependent ELF dynamic relocation inline functions. Stub version. | |
Copyright (C) 1995,1996,1997,1999,2000,2001 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, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#define ELF_MACHINE_NAME "stub" | |
#include <string.h> | |
#include <link.h> | |
/* Return nonzero iff ELF header is compatible with the running host. */ | |
static inline int | |
elf_machine_matches_host (const Elf32_Ehdr *ehdr) | |
{ | |
switch (ehdr->e_machine) | |
{ | |
default: | |
return 0; | |
} | |
} | |
/* Return the link-time address of _DYNAMIC. */ | |
static inline Elf32_Addr | |
elf_machine_dynamic (void) | |
{ | |
#error "Damn, no _DYNAMIC" | |
} | |
/* Return the run-time load address of the shared object. */ | |
static inline Elf32_Addr | |
elf_machine_load_address (void) | |
{ | |
#error "Where am I?" | |
} | |
/* Fixup a PLT entry to bounce directly to the function at VALUE. */ | |
static inline Elf32_Addr | |
elf_machine_fixup_plt (struct link_map *map, lookup_t t, | |
const Elf32_Rel *reloc, | |
Elf32_Addr *reloc_addr, Elf32_Addr value) | |
{ | |
return *reloc_addr = value; | |
} | |
/* 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: | |
_dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 0); | |
break; | |
} | |
} | |
static inline Elf32_Addr | |
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 " | |
NULL, ELF_MACHINE_NAME); | |
} | |
/* 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 int | |
elf_machine_runtime_setup (struct link_map *l, int lazy) | |
{ | |
extern void _dl_runtime_resolve (Elf32_Word); | |
if (lazy) | |
{ | |
/* 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 *) D_PTR (l, l_info[DT_PLTGOT]); | |
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; | |
} | |
return lazy; | |
} | |
/* 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 |