| /* Machine-dependent ELF dynamic relocation inline functions. Stub version. |
| Copyright (C) 1995-2018 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #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 ElfW(Addr) |
| elf_machine_fixup_plt (struct link_map *map, lookup_t t, |
| const ElfW(Sym) *refsym, const ElfW(Sym) *sym, |
| const ElfW(Rel) *reloc, |
| ElfW(Addr) *reloc_addr, ElfW(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. */ |
| |
| auto inline void |
| __attribute__ ((always_inline)) |
| 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; |
| } |
| } |
| |
| |
| auto inline Elf32_Addr |
| __attribute__ ((always_inline)) |
| 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 |