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crypto/armcap.c: short-circuit processor capability probe in iOS builds.

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Capability probing by catching SIGILL appears to be problematic
on iOS. But since Apple universe is "monocultural", it's actually
possible to simply set pre-defined processor capability mask.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2617)
This commit is contained in:
Andy Polyakov 2017-02-15 12:01:09 +01:00
parent c93f06c12f
commit 8653e78f43
1 changed files with 18 additions and 0 deletions
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18
crypto/armcap.c
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@ -111,6 +111,24 @@ void OPENSSL_cpuid_setup(void)
return;
}
# if defined(__APPLE__) && !defined(__aarch64__)
/*
* Capability probing by catching SIGILL appears to be problematic
* on iOS. But since Apple universe is "monocultural", it's actually
* possible to simply set pre-defined processor capability mask.
*/
if (1) {
OPENSSL_armcap_P = ARMV7_NEON;
return;
}
/*
* One could do same even for __aarch64__ iOS builds. It's not done
* exclusively for reasons of keeping code unified across platforms.
* Unified code works because it never triggers SIGILL on Apple
* devices...
*/
# endif
sigfillset(&all_masked);
sigdelset(&all_masked, SIGILL);
sigdelset(&all_masked, SIGTRAP);