Commit 19308587 authored Feb 07, 2018 by Patrick Steuer Committed by Andy Polyakov Feb 13, 2018

s390x assembly pack: implement OPENSSL_rdtsc as STCKF



.. if avalable. STCK has an artificial delay to ensure uniqueness
which can result in a performance penalty if used heavily
concurrently.

Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com>

Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5284)

parent 97d37b85

crypto/s390xcpuid.pl

+8 −0

Original line number	Diff line number	Diff line
		@@ -129,6 +129,14 @@ OPENSSL_s390x_facilities:
		.type OPENSSL_rdtsc,\@function
		.align 16
		OPENSSL_rdtsc:
		larl %r4,OPENSSL_s390xcap_P
		tm S390X_STFLE+3(%r4),0x40 # check for store-clock-fast facility
		jz .Lstck

		.long 0xb27cf010 # stckf 16($sp)
		lg %r2,16($sp)
		br $ra
		.Lstck:
		stck 16($sp)
		lg %r2,16($sp)
		br $ra

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