powerpc: Fix interrupt range check on debug exception

We do not want to take single step and branch-taken debug exception
in kernel exception code. But the address range check was not covering
all kernel exception handlers address range.

With this patch we defined the interrupt_end label which defines the
end on kernel exception code. So now we check interrupt_base to
interrupt_end range for not handling debug exception in kernel
exception entry.

Signed-off-by: Bharat Bhushan <[e-mail]>
Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

arch/powerpc/kernel/head_44x.S

···
 	 */
 	DEBUG_CRIT_EXCEPTION
 
+interrupt_end:
+
 /*
  * Global functions
  */

arch/powerpc/kernel/head_booke.h

···
 	andis.	r10,r10,(DBSR_IC|DBSR_BT)@h;				      \
 	beq+	2f;							      \
 									      \
-	lis	r10,KERNELBASE@h;	/* check if exception in vectors */   \
-	ori	r10,r10,KERNELBASE@l;					      \
+	lis	r10,interrupt_base@h;	/* check if exception in vectors */   \
+	ori	r10,r10,interrupt_base@l;				      \
 	cmplw	r12,r10;						      \
 	blt+	2f;			/* addr below exception vectors */    \
 									      \
-	lis	r10,DebugDebug@h;					      \
-	ori	r10,r10,DebugDebug@l;					      \
+	lis	r10,interrupt_end@h;					      \
+	ori	r10,r10,interrupt_end@l;				      \
 	cmplw	r12,r10;						      \
 	bgt+	2f;			/* addr above exception vectors */    \
 									      \
···
 	andis.	r10,r10,(DBSR_IC|DBSR_BT)@h;				      \
 	beq+	2f;							      \
 									      \
-	lis	r10,KERNELBASE@h;	/* check if exception in vectors */   \
-	ori	r10,r10,KERNELBASE@l;					      \
+	lis	r10,interrupt_base@h;	/* check if exception in vectors */   \
+	ori	r10,r10,interrupt_base@l;				      \
 	cmplw	r12,r10;						      \
 	blt+	2f;			/* addr below exception vectors */    \
 									      \
-	lis	r10,DebugCrit@h;					      \
-	ori	r10,r10,DebugCrit@l;					      \
+	lis	r10,interrupt_end@h;					      \
+	ori	r10,r10,interrupt_end@l;				      \
 	cmplw	r12,r10;						      \
 	bgt+	2f;			/* addr above exception vectors */    \
 									      \

arch/powerpc/kernel/head_fsl_booke.S

···
 	/* Embedded Hypervisor Privilege */
 	EXCEPTION(0, HV_PRIV, Ehvpriv, unknown_exception, EXC_XFER_EE)
 
+interrupt_end:
+
 /*
  * Local functions
  */