[PATCH 5/6][XEN][x86_64] Add macro for debugreg

[Vincent Hanquez <vincent.hanquez@cl.cam.ac.uk>]

Hi,

The following patch add 2 macros to set and get debugreg on x86_64.
This is useful for Xen because it will need only to redefine each macro
to a hypervisor call. 

Please apply, or comments.

	Signed-off-by: Vincent Hanquez <vincent.hanquez@cl.cam.ac.uk>

diff -Naur linux-2.6.12-rc3.1/arch/x86_64/kernel/signal.c linux-2.6.12-rc3.2/arch/x86_64/kernel/signal.c
--- linux-2.6.12-rc3.1/arch/x86_64/kernel/signal.c	2005-04-25 14:19:05.000000000 +0100
+++ linux-2.6.12-rc3.2/arch/x86_64/kernel/signal.c	2005-04-25 14:59:09.950079957 +0100
@@ -433,7 +433,7 @@
 		 * inside the kernel.
 		 */
 		if (current->thread.debugreg7)
-			asm volatile("movq %0,%%db7"	: : "r" (current->thread.debugreg7));
+			cpu_set_debugreg(current->thread.debugreg7, 7);
 
 		/* Whee!  Actually deliver the signal.  */
 		handle_signal(signr, &info, &ka, oldset, regs);
diff -Naur linux-2.6.12-rc3.1/arch/x86_64/kernel/traps.c linux-2.6.12-rc3.2/arch/x86_64/kernel/traps.c
--- linux-2.6.12-rc3.1/arch/x86_64/kernel/traps.c	2005-04-25 12:01:25.000000000 +0100
+++ linux-2.6.12-rc3.2/arch/x86_64/kernel/traps.c	2005-04-25 14:58:17.006385409 +0100
@@ -667,7 +667,7 @@
        }
 #endif
 
-	asm("movq %%db6,%0" : "=r" (condition));
+	cpu_get_debugreg(condition, 6);
 
 	if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
 						SIGTRAP) == NOTIFY_STOP)
@@ -719,7 +719,7 @@
 	info.si_addr = (void __user *)regs->rip;
 	force_sig_info(SIGTRAP, &info, tsk);	
 clear_dr7:
-	asm volatile("movq %0,%%db7"::"r"(0UL));
+	cpu_set_debugreg(0UL, 7);
 	return;
 
 clear_TF_reenable:
diff -Naur linux-2.6.12-rc3.1/include/asm-x86_64/processor.h linux-2.6.12-rc3.2/include/asm-x86_64/processor.h
--- linux-2.6.12-rc3.1/include/asm-x86_64/processor.h	2005-04-25 15:37:51.000000000 +0100
+++ linux-2.6.12-rc3.2/include/asm-x86_64/processor.h	2005-04-25 15:38:13.750221554 +0100
@@ -280,6 +280,14 @@
 	set_fs(USER_DS);							 \
 } while(0) 
 
+#define cpu_get_debugreg(var, register)				\
+		__asm__("movq %%db" #register ", %0"		\
+			:"=r" (var))
+#define cpu_set_debugreg(value, register)			\
+		__asm__("movq %0,%%db" #register		\
+			: /* no output */			\
+			:"r" (value))
+
 struct task_struct;
 struct mm_struct;
 
-
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