Results in a more predictable (i.e. linear) memory access pattern.
No functional change.
Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Jan Beulich <jbeul...@suse.com>
Reviewed-by: Wei Liu <wei.l...@citrix.com>
---
xen/include/asm-x86/asm_defns.h | 26 +++++++++++++-------------
1 file changed, 13 insertions(+), 13 deletions(-)
diff --git a/xen/include/asm-x86/asm_defns.h b/xen/include/asm-x86/asm_defns.h
index 98192eb..fa62c54 100644
--- a/xen/include/asm-x86/asm_defns.h
+++ b/xen/include/asm-x86/asm_defns.h
@@ -259,6 +259,19 @@ static always_inline void stac(void)
*/
.macro RESTORE_ALL adj=0 compat=0
.if !\compat
+ movq UREGS_r15(%rsp), %r15
+ movq UREGS_r14(%rsp), %r14
+ movq UREGS_r13(%rsp), %r13
+ movq UREGS_r12(%rsp), %r12
+.else
+ xor %r15, %r15
+ xor %r14, %r14
+ xor %r13, %r13
+ xor %r12, %r12
+.endif
+ LOAD_ONE_REG(bp, \compat)
+ LOAD_ONE_REG(bx, \compat)
+.if !\compat
movq UREGS_r11(%rsp),%r11
movq UREGS_r10(%rsp),%r10
movq UREGS_r9(%rsp),%r9
@@ -274,19 +287,6 @@ static always_inline void stac(void)
LOAD_ONE_REG(dx, \compat)
LOAD_ONE_REG(si, \compat)
LOAD_ONE_REG(di, \compat)
-.if !\compat
- movq UREGS_r15(%rsp),%r15
- movq UREGS_r14(%rsp),%r14
- movq UREGS_r13(%rsp),%r13
- movq UREGS_r12(%rsp),%r12
-.else
- xor %r15, %r15
- xor %r14, %r14
- xor %r13, %r13
- xor %r12, %r12
-.endif
- LOAD_ONE_REG(bp, \compat)
- LOAD_ONE_REG(bx, \compat)
subq $-(UREGS_error_code-UREGS_r15+\adj), %rsp
.endm
--
2.1.4
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