cpu.h contains almost entirely private symbols, which aren't reliably
usable outside the library because they lack OPENSSL_EXPORT. (And can't
have OPENSSL_EXPORT. The linker wants references to exported symbols to
go through the GOT, and our assembly doesn't do that.) In preparation
for unexporting them, move the few public APIs to crypto.h. They seem
similar in spirit to functions like CRYPTO_has_asm.
Update-Note: As part of this, I conditioned cpu-arm-linux.c on
OPENSSL_LINUX, so that the header files can have accurate conditions.
This means unrecognized ARM platforms that do not set
OPENSSL_STATIC_ARMCAP will fail to build, where previously we defaulted
to the Linux mechanisms. This matches cpu-aarch64-linux.c, which is
already gated on OPENSSL_LINUX. (And the file is quite Linux-specific.
Even if a non-Linux ELF target used getauxval for ARM capabilities, it's
unlikely that our hardcoded constants and /proc behavior applies
anyway.)
Change-Id: I1ee9eb72097be619d3f28a51b1ea058b3c37d05a
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/50845
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
David Benjamin
37faa936b5