openbsd-src/libexec/ld.so/amd64/ at jcs · jcs.org/openbsd-src

jcs.org / openbsd-src

jcs's openbsd hax

openbsd

openbsd-src / libexec / ld.so / amd64 /

at jcs 6 files

enable -fret-clean on amd64, for libc libcrypto ld.so kernel, and all the ssh tools. The dynamic objects are entirely ret-clean, static binaries will contain a blend of cleaning and non-cleaning callers.

2 years ago

Make sure the syscall table entries are aligned on a 4-byte boundary. Required for strict-alignment architectures and a good idea on others. same as kettenis commit to libc

2 years ago

crt0 uses a helper function in a MD src/libexec/ld.so .h file (rather than reproducing the relevant defines and code in a different place) to perform minor relocations. If things go very wrong, it would call _dl_exit() -- a locally defined crt0 function which is syscall exit(2). We don't need to call exit(2) for this obscure case which doesn't happen and provides no debugging information. An 'abort' is going to provide better information. So let's change the function name to _dso_abort() and make it a single illegal instruction. ok guenther

2 years ago

For strange reasons which made sense at the time, the text segment was placed head of the btext (boot.text) segment. (the boot.text segment is "unmapped" after initization, as a self-protection mechanism). this meant the LOAD's virtual addresses were not in sequence, which clearly isn't what we intended.

2 years ago

If you disable retpolineplt then _dl_bind_start is called with an indirect branch, so include an endbr64 Just In Case.

2 years ago

Unite all nitems copies in ld.so/util.h

3 years ago