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| author | H. Peter Anvin <hpa@zytor.com> | 2007-07-14 16:47:13 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2007-07-18 11:36:17 -0700 |
| commit | 5593eaa854d0b23c3b270933a93b9b82946df729 (patch) | |
| tree | f1efc4a66fcc25749db43eaa77e3075c65b2a1ab /arch/i386/boot/boot.h | |
| parent | 9aa3909c0ea33da41755e15182fa4f88ae036d83 (diff) | |
| download | lwn-5593eaa854d0b23c3b270933a93b9b82946df729.tar.gz lwn-5593eaa854d0b23c3b270933a93b9b82946df729.zip | |
[x86 setup] Fix assembly constraints
Fix incorrect assembly constraints. In particular, fix memory
constraints used inside push..pop, which can cause invalid operation
since gcc may generate %esp-relative references.
Additionally:
outl() should have "dN" not "dn".
query_mca() shouldn't listen 16/32-bit registers in an 8-bit only
context.
has_eflag(): the "mask" is only used well after both the stack pointer
and the output registers have been touched; this requires the output
registers to be earlyclobbers (=&) and the input to exclude memory (so
"ri", not "g").
Thanks to Etienne Lorrain and Chuck Ebbert for prompting this review.
Cc: Etienne Lorrain <etienne_lorrain@yahoo.fr>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/i386/boot/boot.h')
| -rw-r--r-- | arch/i386/boot/boot.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/i386/boot/boot.h b/arch/i386/boot/boot.h index 0329c4fe4f88..dec70c9b6050 100644 --- a/arch/i386/boot/boot.h +++ b/arch/i386/boot/boot.h @@ -56,7 +56,7 @@ static inline u16 inw(u16 port) static inline void outl(u32 v, u16 port) { - asm volatile("outl %0,%1" : : "a" (v), "dn" (port)); + asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); } static inline u32 inl(u32 port) { |