Add _?ENTRY_NB() macro for doing an ASM function entry without
setting the binding to global (NB == "no binding"), as clang 13 is
now warning about changing the binding from global to weak. Use
them

Add _?ENTRY_NB() macro for doing an ASM function entry without
setting the binding to global (NB == "no binding"), as clang 13 is
now warning about changing the binding from global to weak. Use
them for bcopy, brk, and sbrk.

Add the '.L' prefix to internal labels in the bcopy implementation
to remove them from the symbol table

Start using the MI DEFS.h: delete the #defines from powerpc/SYS.h
that the MI DEFS.h provides and switch from SYS.h to DEFS.h in files
that don't do syscalls. Use END_BUILTIN from the MI DEFS.h for ffs.

ok gkoehler@

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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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Provide an optimized implementation of ffs(3) in libc on
aarch64/powerpc/powerpc64, making use of the count leading
zeros instruction. Also add a brief regression test.
ok deraadt@ kettenis@