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| author | Jan Beulich <jbeulich@suse.com> | 2012-09-26 11:48:21 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2012-09-26 11:48:21 +0200 |
| commit | f430ebef51f16767ec5e127131cdb3115aa1ae1b (patch) | |
| tree | c8b773123e62b3066cf0b157c0f86dfc2eba456a /xen/include/asm-x86/x86_64 | |
| parent | d9de3dbee34504651572b07d90950902a47b7919 (diff) | |
| download | xen-f430ebef51f16767ec5e127131cdb3115aa1ae1b.tar.gz xen-f430ebef51f16767ec5e127131cdb3115aa1ae1b.tar.bz2 xen-f430ebef51f16767ec5e127131cdb3115aa1ae1b.zip | |
x86: enhance rsp-relative calculations
The use of "or" in GET_CPUINFO_FIELD so far wasn't ideal, as it doesn't
lend itself to folding this operation with a possibly subsequent one
(e.g. the well known mov+add=lea conversion). Split out the sub-
operations, and shorten assembly code slightly with this.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
Diffstat (limited to 'xen/include/asm-x86/x86_64')
| -rw-r--r-- | xen/include/asm-x86/x86_64/asm_defns.h | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/xen/include/asm-x86/x86_64/asm_defns.h b/xen/include/asm-x86/x86_64/asm_defns.h index d8e87ebe63..6278446dc2 100644 --- a/xen/include/asm-x86/x86_64/asm_defns.h +++ b/xen/include/asm-x86/x86_64/asm_defns.h @@ -111,14 +111,6 @@ STR(IRQ) #nr "_interrupt:\n\t" \ "movl $"#nr",4(%rsp)\n\t" \ "jmp common_interrupt"); -#define GET_CPUINFO_FIELD(field,reg) \ - movq $~(STACK_SIZE-1),reg; \ - andq %rsp,reg; \ - orq $(STACK_SIZE-CPUINFO_sizeof+field),reg; -#define GET_CURRENT(reg) \ - GET_CPUINFO_FIELD(CPUINFO_current_vcpu,reg) \ - movq (reg),reg; - #ifdef __ASSEMBLY__ # define _ASM_EX(p) p-. #else |