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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