Add CFI start/end proc directives to arm64, i386, and ppc

[cem]

Summary

Follow-up to r353959 and r368070: do the same for other architectures.

arm32 already seems to use its own .fnstart/.fnend directives, which
appear to be ARM-specific variants of the same thing. Likewise, MIPS
uses .frame directives.

Test Plan

Tinderbox running.

[jrtc27]

sys/powerpc/include/asm.h

112

This is the descriptor; you need it after DOT_LABEL(name).

163

END_SIZE(name) whilst you're here?

[cem]

sys/powerpc/include/asm.h

112

Thanks, will fix.

163

Sorry, what about END_SIZE?

[cem]

• Move cfi_startproc in ELFv1 prologue after DOT_LABEL

[jrtc27]

sys/powerpc/include/asm.h

163

Currently there's no .size directive for powerpc32, unlike powerpc64. There's an END_SIZE macro available for that, though it looks like it's assuming powerpc64 without checking so you might want to just do a normal .size.

[cem]

sys/powerpc/include/asm.h

163

Sure, I'll add it. Thanks.

[cem]

Add a lot of missing END directives. Tinderbox passes on arm64 and i386.
PowerPC mostly passes, except for all the PS3 HV calls which still need END
directives (and there are hundreds of these).

[cem]

• Add remaining missing END/ASEND directives in powerpc. Now tinderbox is clean.

[cem]

Fix ENTRY consumers in userspace (syscalls, MD assembly functions)

[cem]

Are there any outstanding objections? (I think I've addressed everything raised so far, but please correct me if I am mistaken.) Is there anyone who hasn't reviewed yet, but will have time to review in the next few days? Thanks.

[arichardson]

Looks good to me. Obviously there might be some non-default build configurations that are missing end() calls, but if so they been be fixed later.

Probably best to wait for at least one more review though.

[bdragon]

I'm fine with it on readthrough, I just hadn't gotten around to the actual tests. If it broke anything in powerpc land, it should be easy to fix. Thanks for tidying up the procedure annotations!

[cem]

In D27387#614192, @bdragon wrote:

I'm fine with it on readthrough, I just hadn't gotten around to the actual tests. If it broke anything in powerpc land, it should be easy to fix. Thanks for tidying up the procedure annotations!

Thanks! It compiles (tinderbox, anyway) and shouldn't affect code generation, so I'm cautiously optimistic nothing broke. Please let me know if it broke something and I can help fix it :-).