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amd64: stop re-reading curpc on subyte/suword

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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
This commit is contained in:
Mateusz Guzik 2018-12-08 04:53:08 +00:00
parent 18519f1583
commit 3c76ace36b
1 changed files with 0 additions and 4 deletions
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4
sys/amd64/amd64/support.S
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@ -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