Index: head/sys/powerpc/aim/locore32.S
===================================================================
--- head/sys/powerpc/aim/locore32.S
+++ head/sys/powerpc/aim/locore32.S
@@ -60,6 +60,12 @@
 GLOBAL(tmpstk)
 	.space	TMPSTKSZ
 
+#ifdef KDB
+#define TRAPSTKSZ       4096            /* 4k trap stack */
+GLOBAL(trapstk)
+        .space        TRAPSTKSZ
+#endif
+
 	.text
 	.globl	btext
 btext:
Index: head/sys/powerpc/aim/locore64.S
===================================================================
--- head/sys/powerpc/aim/locore64.S
+++ head/sys/powerpc/aim/locore64.S
@@ -65,6 +65,14 @@
 TOC_ENTRY(tmpstk)
 TOC_ENTRY(can_wakeup)
 
+#ifdef KDB
+#define TRAPSTKSZ       4096            /* 4k trap stack */
+GLOBAL(trapstk)
+        .space        TRAPSTKSZ
+TOC_ENTRY(trapstk)
+#endif
+
+
 /*
  * Entry point for bootloaders that do not fully implement ELF and start
  * at the beginning of the image (kexec, notably). In its own section so
Index: head/sys/powerpc/aim/trap_subr32.S
===================================================================
--- head/sys/powerpc/aim/trap_subr32.S
+++ head/sys/powerpc/aim/trap_subr32.S
@@ -864,8 +864,8 @@
 	mtsprg3	%r1
 
 	lwz	%r1,TRAP_TOCBASE(0)		/* get new SP */
-	lwz	%r1,tmpstk@got(%r1)
-	addi	%r1,%r1,TMPSTKSZ-16
+	lwz	%r1,trapstk@got(%r1)
+	addi	%r1,%r1,TRAPSTKSZ-16
 
 	FRAME_SETUP(PC_DBSAVE)
 /* Call C trap code: */
Index: head/sys/powerpc/aim/trap_subr64.S
===================================================================
--- head/sys/powerpc/aim/trap_subr64.S
+++ head/sys/powerpc/aim/trap_subr64.S
@@ -897,8 +897,8 @@
 	mtsprg3	%r1
 
 	GET_TOCBASE(%r1)			/* get new SP */
-	ld	%r1,TOC_REF(tmpstk)(%r1)
-	addi	%r1,%r1,(TMPSTKSZ-48)
+	ld	%r1,TOC_REF(trapstk)(%r1)
+	addi	%r1,%r1,(TRAPSTKSZ-48)
 
 	FRAME_SETUP(PC_DBSAVE)
 /* Call C trap code: */