diff options
Diffstat (limited to 'sysdeps/i386/dl-machine.h')
| -rw-r--r-- | sysdeps/i386/dl-machine.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h index 09c1a9b6a4..c499875023 100644 --- a/sysdeps/i386/dl-machine.h +++ b/sysdeps/i386/dl-machine.h @@ -34,6 +34,35 @@ elf_machine_matches_host (const Elf32_Ehdr *ehdr) } +#if defined PI_STATIC_AND_HIDDEN \ + && defined HAVE_VISIBILITY_ATTRIBUTE && defined HAVE_HIDDEN \ + && !defined HAVE_BROKEN_VISIBILITY_ATTRIBUTE + +/* Return the link-time address of _DYNAMIC. Conveniently, this is the + first element of the GOT, a special entry that is never relocated. */ +static inline Elf32_Addr __attribute__ ((unused, const)) +elf_machine_dynamic (void) +{ + /* This produces a GOTOFF reloc that resolves to zero at link time, so in + fact just loads from the GOT register directly. By doing it without + an asm we can let the compiler choose any register. */ + extern const Elf32_Addr _GLOBAL_OFFSET_TABLE_[] attribute_hidden; + return _GLOBAL_OFFSET_TABLE_[0]; +} + +/* Return the run-time load address of the shared object. */ +static inline Elf32_Addr __attribute__ ((unused)) +elf_machine_load_address (void) +{ + /* Compute the difference between the runtime address of _DYNAMIC as seen + by a GOTOFF reference, and the link-time address found in the special + unrelocated first GOT entry. */ + extern Elf32_Dyn bygotoff[] asm ("_DYNAMIC") attribute_hidden; + return (Elf32_Addr) &bygotoff - elf_machine_dynamic (); +} + +#else /* Without .hidden support, we can't compile the code above. */ + /* Return the link-time address of _DYNAMIC. Conveniently, this is the first element of the GOT. This must be inlined in a function which uses global data. */ @@ -60,6 +89,9 @@ elf_machine_load_address (void) return addr; } +#endif + + #if !defined PROF && !__BOUNDED_POINTERS__ /* We add a declaration of this function here so that in dl-runtime.c the ELF_MACHINE_RUNTIME_TRAMPOLINE macro really can pass the parameters |