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Commit f5012310 authored by Vincent Hanquez's avatar Vincent Hanquez Committed by Linus Torvalds
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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: default avatarVincent Hanquez <vincent.hanquez@cl.cam.ac.uk>
Cc: Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 701067c4

include/asm-i386/processor.h

+9 −5
Original line number Original line Diff line number Diff line
@@ -501,12 +501,16 @@ static inline void load_esp0(struct tss_struct *tss, struct thread_struct *threa 
} while (0)

} 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) \

#define get_debugreg(var, register)				\

		__asm__("movl %%db" #register ", %0"		\

			:"=r" (var))

#define set_debugreg(value, register)			\

		__asm__("movl %0,%%db" #register		\

		__asm__("movl %0,%%db" #register		\

			: /* no output */			\

			: /* no output */			\

                       :"r" ((thread)->debugreg[register]))

			:"r" (value))







/* Forward declaration, a strange C thing */

/* Forward declaration, a strange C thing */

struct task_struct;

struct task_struct;