nds32: fix ptrace and interrupt register overflow

Fix ptrace and interrupt register overflow warning.
Add missing P0 and P1 (r26 and r27) into register lists.
These register are usually used in OS.

Signed-off-by: Macpaul Lin <macpaul@gmail.com>
diff --git a/arch/nds32/include/asm/ptrace.h b/arch/nds32/include/asm/ptrace.h
index 4336083..ee181b2 100644
--- a/arch/nds32/include/asm/ptrace.h
+++ b/arch/nds32/include/asm/ptrace.h
@@ -38,6 +38,8 @@
 	NDS32_REG d1hi;
 	NDS32_REG d1lo;
 	NDS32_REG r[26];	/* r0 - r25 */
+	NDS32_REG p0;		/* r26 - used by OS */
+	NDS32_REG p1;		/* r27 - used by OS */
 	NDS32_REG fp;		/* r28 */
 	NDS32_REG gp;		/* r29 */
 	NDS32_REG lp;		/* r30 */
diff --git a/arch/nds32/lib/interrupts.c b/arch/nds32/lib/interrupts.c
index 974d52a..ca8c227 100644
--- a/arch/nds32/lib/interrupts.c
+++ b/arch/nds32/lib/interrupts.c
@@ -91,7 +91,7 @@
 	printf("D1H: %08lx  D1L: %08lx  D0H: %08lx  D0L: %08lx\n",
 		regs->d1hi, regs->d1lo, regs->d0hi, regs->d0lo);
 	printf("r27: %08lx  r26: %08lx  r25: %08lx  r24: %08lx\n",
-		regs->r[27], regs->r[26], regs->r[25], regs->r[24]);
+		regs->p1, regs->p0, regs->r[25], regs->r[24]);
 	printf("r23: %08lx  r22: %08lx  r21: %08lx  r20: %08lx\n",
 		regs->r[23], regs->r[22], regs->r[21], regs->r[20]);
 	printf("r19: %08lx  r18: %08lx  r17: %08lx  r16: %08lx\n",