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

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 to macppc kernel locore.S, ofwreal.S, setjmp.S

This changes RETGUARD_SETUP(ffs) to RETGUARD_SETUP(ffs, %r11, %r12)
and RETGUARD_CHECK(ffs) to RETGUARD_CHECK(ffs, %r11, %r12)
to show tha

Add retguard to macppc kernel locore.S, ofwreal.S, setjmp.S

This changes RETGUARD_SETUP(ffs) to RETGUARD_SETUP(ffs, %r11, %r12)
and RETGUARD_CHECK(ffs) to RETGUARD_CHECK(ffs, %r11, %r12)
to show that r11 and r12 are in use between setup and check, and to
pick registers other than r11 and r12 in some kernel functions.

ok mortimer@ deraadt@

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Retguard asm macros for powerpc libc, ld.so

Add retguard to some, but not all, asm functions in libc. Edit SYS.h
in libc to remove the PREFIX macros and add SYSENTRY (more like
aarch64 and powerpc6

Retguard asm macros for powerpc libc, ld.so

Add retguard to some, but not all, asm functions in libc. Edit SYS.h
in libc to remove the PREFIX macros and add SYSENTRY (more like
aarch64 and powerpc64), so we can insert RETGUARD_SETUP after
SYSENTRY. Some .S files in this commit don't get retguard, but do
stop using the old prefix macros.

Tested by deraadt@, who put this diff in a macppc snap.

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_dl_cerror is trivial on powerpc; just inline the handling into the stubs

based on a diff from miod@

Replace heaps of hand-written syscall stubs with a simpler framework
which is largely MI.
ok visa kettenis