diff options
Diffstat (limited to 'sysdeps/generic/dl-machine.h')
| -rw-r--r-- | sysdeps/generic/dl-machine.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/sysdeps/generic/dl-machine.h b/sysdeps/generic/dl-machine.h new file mode 100644 index 0000000000..f787df3500 --- /dev/null +++ b/sysdeps/generic/dl-machine.h @@ -0,0 +1,137 @@ +/* Machine-dependent ELF dynamic relocation inline functions. Stub version. + Copyright (C) 1995, 1996, 1997 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., + 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 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 void +elf_machine_fixup_plt (struct link_map *map, const Elf32_Rel *reloc, + Elf32_Addr *reloc_addr, Elf32_Addr value) +{ + *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: + assert (! "unexpected dynamic reloc type"); + 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 " + 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 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 *) 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; + } + + 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 |