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[PATCH] xen: x86: add macro for debugreg 

Add 2 macros to set and get debugreg on x86.  This is useful for Xen because
it will need only to redefine each macro to a hypervisor call.

Signed-off-by: Vincent Hanquez <vincent.hanquez@cl.cam.ac.uk>
Cc: Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Vincent Hanquez 2005-06-23 00:08:42 -07:00 committed by Linus Torvalds
parent 701067c466
commit f5012310e3
1 changed files with 9 additions and 5 deletions
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14
include/asm-i386/processor.h
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@ -501,12 +501,16 @@ static inline void load_esp0(struct tss_struct *tss, struct thread_struct *threa
} while (0)
/*
* This special macro can be used to load a debugging register
* These special macros can be used to get or set a debugging register
*/
#define loaddebug(thread,register) \
__asm__("movl %0,%%db" #register \
: /* no output */ \
:"r" ((thread)->debugreg[register]))
#define get_debugreg(var, register) \
__asm__("movl %%db" #register ", %0" \
:"=r" (var))
#define set_debugreg(value, register) \
__asm__("movl %0,%%db" #register \
: /* no output */ \
:"r" (value))
/* Forward declaration, a strange C thing */
struct task_struct;