Date: Sat, 8 Dec 2018 04:53:09 +0000 (UTC) From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r341719 - head/sys/amd64/amd64 Message-ID: <201812080453.wB84r9tO060253@repo.freebsd.org>
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Author: mjg Date: Sat Dec 8 04:53:08 2018 New Revision: 341719 URL: https://svnweb.freebsd.org/changeset/base/341719 Log: amd64: stop re-reading curpc on subyte/suword Originally read value is still safely kept. Re-reading code was there for previous iterations which were partially shared with i386. Sponsored by: The FreeBSD Foundation Modified: head/sys/amd64/amd64/support.S Modified: head/sys/amd64/amd64/support.S ============================================================================== --- head/sys/amd64/amd64/support.S Sat Dec 8 00:48:10 2018 (r341718) +++ head/sys/amd64/amd64/support.S Sat Dec 8 04:53:08 2018 (r341719) @@ -1155,7 +1155,6 @@ ENTRY(suword16_nosmap) movw %si,(%rdi) xorl %eax,%eax - movq PCPU(CURPCB),%rcx /* restore trashed register */ movq %rax,PCB_ONFAULT(%rcx) POP_FRAME_POINTER ret @@ -1174,7 +1173,6 @@ ENTRY(suword16_smap) movw %si,(%rdi) clac xorl %eax,%eax - movq PCPU(CURPCB),%rcx /* restore trashed register */ movq %rax,PCB_ONFAULT(%rcx) POP_FRAME_POINTER ret @@ -1192,7 +1190,6 @@ ENTRY(subyte_nosmap) movl %esi,%eax movb %al,(%rdi) xorl %eax,%eax - movq PCPU(CURPCB),%rcx /* restore trashed register */ movq %rax,PCB_ONFAULT(%rcx) POP_FRAME_POINTER ret @@ -1212,7 +1209,6 @@ ENTRY(subyte_smap) movb %al,(%rdi) clac xorl %eax,%eax - movq PCPU(CURPCB),%rcx /* restore trashed register */ movq %rax,PCB_ONFAULT(%rcx) POP_FRAME_POINTER ret
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