[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>
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1 changed files with 9 additions and 5 deletions
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@ -501,12 +501,16 @@ static inline void load_esp0(struct tss_struct *tss, struct thread_struct *threa
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} while (0)
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/*
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* This special macro can be used to load a debugging register
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* These special macros can be used to get or set a debugging register
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*/
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#define loaddebug(thread,register) \
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__asm__("movl %0,%%db" #register \
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: /* no output */ \
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:"r" ((thread)->debugreg[register]))
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#define get_debugreg(var, register) \
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__asm__("movl %%db" #register ", %0" \
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:"=r" (var))
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#define set_debugreg(value, register) \
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__asm__("movl %0,%%db" #register \
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: /* no output */ \
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:"r" (value))
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/* Forward declaration, a strange C thing */
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struct task_struct;
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