From: Vincent Hanquez <vincent.hanquez@cl.cam.ac.uk>
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>
---
include/asm-i386/processor.h | 14 +++++++++-----
1 files changed, 9 insertions(+), 5 deletions(-)
diff -puN include/asm-i386/processor.h~xen-x86-add-macro-for-debugreg include/asm-i386/processor.h
--- 25/include/asm-i386/processor.h~xen-x86-add-macro-for-debugreg 2005-04-26 20:56:11.768134320 -0700
+++ 25-akpm/include/asm-i386/processor.h 2005-04-26 20:56:11.772133712 -0700
@@ -501,12 +501,16 @@ static inline void load_esp0(struct tss_
} 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;
_