Commit Graph

10 Commits

Author SHA1 Message Date
Rich Felker 6fef8cafbd remove hand-written crt1.s and Scrt1.s files for all archs
since commit c5e34dabbb, crt1.c has
provided a "mostly-C" implementation of the crt1 start file that
avoids the need for arch-specific symbol referencing, PIC/PIE-specific
code variants, etc. but for archs that had existing hand-written
versions, the new code was initially unused, and later only used as
the dynamic linker entry point. this commit switches all archs to
using the new code.

the code being removed was a recurring source of subtle errors, and
was still broken at least on arm, where it failed to properly align
the stack pointer before calling into C code.
2015-10-14 17:08:34 -04:00
Rich Felker a6d272127b align stack properly for calling global ctors/dtors on x86[_64]
failure to do so was causing crashes on x86_64 when ctors used SSE,
which was first observed when ctors called variadic functions due to
the SSE prologue code inserted into every variadic function.
2013-06-03 17:32:42 -04:00
Rich Felker faab12bece consistency cleanup: removed redundant size suffixed from i386 asm 2012-05-02 21:03:25 -04:00
Rich Felker 83023d1b50 PIE support for i386 2012-05-02 21:01:55 -04:00
Rich Felker c9dea48f84 remove attempts to be pie-compatible from i386 crt1.s
it does not work; after further consideration, a separate Scrt1.s for
pie really is essential. it would be nice if the unified approach
worked, but the linker fails to generate the correct PLT entries and
instead puts textrels in the main program, which don't work because
the kernel maps the text read-only.

new Scrt1.s will be committed soon in place of this.
2012-05-02 20:56:55 -04:00
Rich Felker 4ce3cb5cdd add support for init/finit (constructors and destructors)
this is mainly in hopes of supporting c++ (not yet possible for other
reasons) but will also help applications/libraries which use (and more
often, abuse) the gcc __attribute__((__constructor__)) feature in "C"
code.

x86_64 and arm versions of the new startup asm are untested and may
have minor problems.
2012-02-06 14:39:09 -05:00
Rich Felker 8cd48f0965 cleanup comment cruft in startup code 2011-02-21 22:27:35 -05:00
Rich Felker e2ee1bdd8d make startup code PIE-compatible 2011-02-21 22:26:31 -05:00
Rich Felker ba68efc921 shave off 2 bytes from crt1.o _start 2011-02-20 19:07:19 -05:00
Rich Felker 0b44a0315b initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00