for __do_global_ctors_aux() and __do_global_dtors_aux(),
to fix building with gcc3 -O3.
Discussed with Matt Thomas & Christos Zoulas, and tested on alpha & i386.
_eprol@GOTPCREL, it resolved it internally as a PC-relative instruction,
getting garbage, since the needed value is in the GOT. Add a CPP hook
to export it explicitly, this makes it work. Only active on amd64. XXX
empty for others. x86_64 (and s390, which we do not have) have .eh_frame
as a read-only section, so __EH_FRAME_BEGIN__ and the register/deregister
functions must take a const foo *.
This also fixes an ICE in gcc 3.3.1 (see gcc PR #9552)
Previously dlsym resolved to the version in crt0.o or libc which would
mean that the caller's shared object couldn't be determined correctly
using __builtin_return_address(0).
Mainly from FreeBSD, but adapted by me. Benefits of this solutions are:
- backward comptibility maintained
- existing broken binaries are fixed with a new ld.elf_so
- __mainprog_obj can be removed from crt0.o
- we do the same thing as FreeBSD
Fixes PR 22067.
OKed by Jason and Christos.
replaced mostly with .IMPSRC, so add .c wrappers for variant .o names
* any machine with a shared crt0.c that also uses common_elf (I didn't see
any) will now need a reachover wrapper in .CURDIR a la crtbeginS.c
this should fix the build breakage
and .fini sections, respectively (same as the {init,fini}_fallthru
stubs).
This is needed on PowerPC, where otherwise the linker would be unhappy
with the relocation records for the fallthru stubs when building a
shared library.
things like the .note.netbsd.ident section are provided by crti/crtn.
crti/crtn also provide the _init() and _fini() routines.
crtbegin/crtend now only provide support for ctors/dtors. This paves
the way to using the "crtstuff" provided with GCC (when we upgrade to
GCC 3.3), which provides, among other things, much better C++/Java
exception handling.
skrll