Hi,
The following patch 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.
I can regenerate a patch keeping loaddebug if you folks seems that is
necessary or better.
Please apply, or comments.
Signed-off-by: Vincent Hanquez <[email protected]>
diff -Naur linux-2.6.12-rc3/include/asm-i386/processor.h linux-2.6.12-rc3.1/include/asm-i386/processor.h
--- linux-2.6.12-rc3/include/asm-i386/processor.h 2005-04-21 11:46:10.000000000 +0100
+++ linux-2.6.12-rc3.1/include/asm-i386/processor.h 2005-04-22 12:09:43.000000000 +0100
@@ -501,12 +501,16 @@
} 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 cpu_get_debugreg(var, register) \
+ __asm__("movl %%db" #register ", %0" \
+ :"=r" (var))
+#define cpu_set_debugreg(value, register) \
+ __asm__("movl %0,%%db" #register \
+ : /* no output */ \
+ :"r" (value))
+
/* Forward declaration, a strange C thing */
struct task_struct;
-
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