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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 | |
| parent | 9aa3909c0ea33da41755e15182fa4f88ae036d83 (diff) | |
| download | op-kernel-dev-5593eaa854d0b23c3b270933a93b9b82946df729.zip op-kernel-dev-5593eaa854d0b23c3b270933a93b9b82946df729.tar.gz | |
[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')
| -rw-r--r-- | arch/i386/boot/boot.h | 2 | ||||
| -rw-r--r-- | arch/i386/boot/cpucheck.c | 4 | ||||
| -rw-r--r-- | arch/i386/boot/mca.c | 2 | ||||
| -rw-r--r-- | arch/i386/boot/pm.c | 2 | ||||
| -rw-r--r-- | arch/i386/boot/video.c | 2 | ||||
| -rw-r--r-- | arch/i386/boot/voyager.c | 2 |
6 files changed, 7 insertions, 7 deletions
diff --git a/arch/i386/boot/boot.h b/arch/i386/boot/boot.h index 0329c4f..dec70c9 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) { diff --git a/arch/i386/boot/cpucheck.c b/arch/i386/boot/cpucheck.c index 8b0f447..991e8ce 100644 --- a/arch/i386/boot/cpucheck.c +++ b/arch/i386/boot/cpucheck.c @@ -115,8 +115,8 @@ static int has_eflag(u32 mask) "pushfl ; " "popl %1 ; " "popfl" - : "=r" (f0), "=r" (f1) - : "g" (mask)); + : "=&r" (f0), "=&r" (f1) + : "ri" (mask)); return !!((f0^f1) & mask); } diff --git a/arch/i386/boot/mca.c b/arch/i386/boot/mca.c index 9b68bd1..68222f2 100644 --- a/arch/i386/boot/mca.c +++ b/arch/i386/boot/mca.c @@ -26,7 +26,7 @@ int query_mca(void) "setc %0 ; " "movw %%es, %1 ; " "popw %%es" - : "=acdSDm" (err), "=acdSDm" (es), "=b" (bx) + : "=acd" (err), "=acdSD" (es), "=b" (bx) : "a" (0xc000)); if (err) diff --git a/arch/i386/boot/pm.c b/arch/i386/boot/pm.c index 3fa53e1..1df025c 100644 --- a/arch/i386/boot/pm.c +++ b/arch/i386/boot/pm.c @@ -65,7 +65,7 @@ static void move_kernel_around(void) "popw %%ds ; " "popw %%es" : "+c" (dwords) - : "rm" (dst_seg), "rm" (src_seg) + : "r" (dst_seg), "r" (src_seg) : "esi", "edi"); syssize -= paras; diff --git a/arch/i386/boot/video.c b/arch/i386/boot/video.c index 3bb3573..027a2c9 100644 --- a/arch/i386/boot/video.c +++ b/arch/i386/boot/video.c @@ -411,7 +411,7 @@ static void restore_screen(void) "1: rep;stosl ; " "popw %%es" : "+D" (dst), "+c" (npad) - : "bdSm" (video_segment), + : "bdS" (video_segment), "a" (0x07200720)); } diff --git a/arch/i386/boot/voyager.c b/arch/i386/boot/voyager.c index 9221614..61c8fe0 100644 --- a/arch/i386/boot/voyager.c +++ b/arch/i386/boot/voyager.c @@ -32,7 +32,7 @@ int query_voyager(void) "setc %0 ; " "movw %%es, %1 ; " "popw %%es" - : "=qm" (err), "=rm" (es), "=D" (di) + : "=q" (err), "=r" (es), "=D" (di) : "a" (0xffc0)); if (err) |
