Date: Thu, 11 Jan 2018 12:54:34 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r327819 - head/sys/amd64/amd64 Message-ID: <201801111254.w0BCsYvQ016212@repo.freebsd.org>
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Author: kib Date: Thu Jan 11 12:54:33 2018 New Revision: 327819 URL: https://svnweb.freebsd.org/changeset/base/327819 Log: Do not clear %RFLAGS.DF on fast syscall entry. Hardware already did it for us due to the mask loaded into the MSR_SF_MASK msr register. Reviewed by: jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D13838 Modified: head/sys/amd64/amd64/exception.S Modified: head/sys/amd64/amd64/exception.S ============================================================================== --- head/sys/amd64/amd64/exception.S Thu Jan 11 12:40:43 2018 (r327818) +++ head/sys/amd64/amd64/exception.S Thu Jan 11 12:54:33 2018 (r327819) @@ -410,7 +410,6 @@ IDTVEC(fast_syscall) movq %r14,TF_R14(%rsp) /* C preserved */ movq %r15,TF_R15(%rsp) /* C preserved */ movl $TF_HASSEGS,TF_FLAGS(%rsp) - cld FAKE_MCOUNT(TF_RIP(%rsp)) movq PCPU(CURTHREAD),%rdi movq %rsp,TD_FRAME(%rdi)
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