From 5593eaa854d0b23c3b270933a93b9b82946df729 Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Sat, 14 Jul 2007 16:47:13 -0700 Subject: [PATCH] [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 Cc: Chuck Ebbert Signed-off-by: H. Peter Anvin --- arch/i386/boot/boot.h | 2 +- arch/i386/boot/cpucheck.c | 4 ++-- arch/i386/boot/mca.c | 2 +- arch/i386/boot/pm.c | 2 +- arch/i386/boot/video.c | 2 +- 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 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) { diff --git a/arch/i386/boot/cpucheck.c b/arch/i386/boot/cpucheck.c index 8b0f4473b083..991e8ceae1de 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 9b68bd1aef19..68222f2d4b67 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 3fa53e15ed77..1df025c73261 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 3bb3573cd6a1..027a2c90300b 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 9221614d0db8..61c8fe0453be 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) -- 2.20.1