Populate the non-LOAD openbsd.syscalls section (and PT_OPENBSD_SYSCALL)
with {uint offset, uint syscall#} entries in libc & ld.so.
In libc a few syscall# entries (break, sigprocmask, _tfork, _threxit

Populate the non-LOAD openbsd.syscalls section (and PT_OPENBSD_SYSCALL)
with {uint offset, uint syscall#} entries in libc & ld.so.
In libc a few syscall# entries (break, sigprocmask, _tfork, _threxit)
are duplicated because additional or inline uses occur (that situation
is handled elsewhere)
ok kettenis

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add retguard prologue/epilogue
ok mortimer

SYS___threxit cannot fail, but this integration looks like a gadget.
Put a hard-trap instruction after the syscall instruction.
ok kettenis mortimer

Add missing comparison instruction. Load %r12 with the indirect branch
address to load the correct TOC address.

PowerPC64 libc powerpc sys files
Initial attempt to port powerpc code to powerpc64

Expects TOC loading in ENTRY(),

ok kettenis@ (some cleanup required)