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| author | Konstantin Belousov <kib@FreeBSD.org> | 2018-01-11 12:54:33 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2018-01-11 12:54:33 +0000 |
| commit | 4975c202ac554bdb482994df3d48974f2f6e2801 (patch) | |
| tree | 05814df31b3f18dddf1eaf89567d35d8dff3058f | |
| parent | 0f7c159f6b056d8b6795ec729f5f638ccb4f68b7 (diff) | |
| download | src-4975c202ac554bdb482994df3d48974f2f6e2801.tar.gz src-4975c202ac554bdb482994df3d48974f2f6e2801.zip | |
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
Notes
Notes:
svn path=/head/; revision=327819
| -rw-r--r-- | sys/amd64/amd64/exception.S | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/sys/amd64/amd64/exception.S b/sys/amd64/amd64/exception.S index d3c11082958a..870e36ab97e7 100644 --- a/sys/amd64/amd64/exception.S +++ b/sys/amd64/amd64/exception.S @@ -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) |