tree 0f53cfc6bc69778dc8ab70afbbb4e94e54e66d10
parent 17b30833737b32ecab1f12c105e1b5cae6d49458
author David Benjamin <davidben@google.com> 1486071439 -0500
committer Adam Langley <agl@google.com> 1486073106 +0000

Fix some compact unwind errors.

The Mac ld gets unhappy about "weird" unwind directives:

In chacha20_poly1305_x86_64.pl, $keyp is being pushed on the stack
(according to the comment) because it gets clobbered in the computation
somewhere. $keyp is %r9 which is not callee-saved (it's an argument
register), so we don't need to tag it with .cfi_offset.

In x25519-asm-x86_64.S, x25519_x86_64_mul saves %rdi on the stack.
However it too is not callee-saved (it's an argument register) and
should not have a .cfi_offset. %rdi also does not appear to be written
to anywhere in the function, so there's no need to save it at all.

(This does not resolve the "r15 is saved too far from return address"
errors. Just the non-standard register ones.)

BUG=176

Change-Id: I53f3f7db3d1745384fb47cb52cd6536aabb5065e
Reviewed-on: https://boringssl-review.googlesource.com/13560
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>