diff --git a/sys/arm64/arm64/db_trace.c b/sys/arm64/arm64/db_trace.c
index f892935cd13..55bf2326b61 100644
--- a/sys/arm64/arm64/db_trace.c
+++ b/sys/arm64/arm64/db_trace.c
@@ -73,7 +73,7 @@ db_stack_trace_cmd(struct unwind_state *frame)
 	db_expr_t offset;
 
 	while (1) {
-		uint64_t pc = frame->pc;
+		uintptr_t pc = frame->pc;
 		int ret;
 
 		ret = unwind_frame(frame);
@@ -109,9 +109,9 @@ db_trace_thread(struct thread *thr, int count)
 	if (thr != curthread) {
 		ctx = kdb_thr_ctx(thr);
 
-		frame.sp = (uint64_t)ctx->pcb_sp;
-		frame.fp = (uint64_t)ctx->pcb_x[29];
-		frame.pc = (uint64_t)ctx->pcb_x[30];
+		frame.sp = (uintptr_t)ctx->pcb_sp;
+		frame.fp = (uintptr_t)ctx->pcb_x[29];
+		frame.pc = (uintptr_t)ctx->pcb_x[30];
 		db_stack_trace_cmd(&frame);
 	} else
 		db_trace_self();
@@ -122,12 +122,12 @@ void
 db_trace_self(void)
 {
 	struct unwind_state frame;
-	uint64_t sp;
+	uintptr_t sp;
 
 	__asm __volatile("mov %0, sp" : "=&r" (sp));
 
 	frame.sp = sp;
-	frame.fp = (uint64_t)__builtin_frame_address(0);
-	frame.pc = (uint64_t)db_trace_self;
+	frame.fp = (uintptr_t)__builtin_frame_address(0);
+	frame.pc = (uintptr_t)db_trace_self;
 	db_stack_trace_cmd(&frame);
 }
diff --git a/sys/arm64/arm64/stack_machdep.c b/sys/arm64/arm64/stack_machdep.c
index 5af5dde2d46..4a977217cb4 100644
--- a/sys/arm64/arm64/stack_machdep.c
+++ b/sys/arm64/arm64/stack_machdep.c
@@ -81,13 +81,13 @@ void
 stack_save(struct stack *st)
 {
 	struct unwind_state frame;
-	uint64_t sp;
+	uintptr_t sp;
 
 	__asm __volatile("mov %0, sp" : "=&r" (sp));
 
 	frame.sp = sp;
-	frame.fp = (uint64_t)__builtin_frame_address(0);
-	frame.pc = (uint64_t)stack_save;
+	frame.fp = (uintptr_t)__builtin_frame_address(0);
+	frame.pc = (uintptr_t)stack_save;
 
 	stack_capture(st, &frame);
 }
diff --git a/sys/arm64/arm64/unwind.c b/sys/arm64/arm64/unwind.c
index bef9c6fa31f..77a66954a11 100644
--- a/sys/arm64/arm64/unwind.c
+++ b/sys/arm64/arm64/unwind.c
@@ -37,17 +37,17 @@ __FBSDID("$FreeBSD$");
 int
 unwind_frame(struct unwind_state *frame)
 {
-	uint64_t fp;
+	uintptr_t fp;
 
 	fp = frame->fp;
 	if (!INKERNEL(fp))
 		return (-1);
 
-	frame->sp = fp + 0x10;
+	frame->sp = fp + sizeof(uintptr_t) * 2;
 	/* FP to previous frame (X29) */
-	frame->fp = *(uint64_t *)(fp);
+	frame->fp = ((uintptr_t *)fp)[0];
 	/* LR (X30) */
-	frame->pc = *(uint64_t *)(fp + 8) - 4;
+	frame->pc = ((uintptr_t *)fp)[1] - 4;
 
 	return (0);
 }
diff --git a/sys/arm64/include/csan.h b/sys/arm64/include/csan.h
index bace3866eb6..766da7b96f4 100644
--- a/sys/arm64/include/csan.h
+++ b/sys/arm64/include/csan.h
@@ -76,14 +76,14 @@ kcsan_md_unwind(void)
 	const char *symname;
 #endif
 	struct unwind_state frame;
-	uint64_t sp;
+	uintptr_t sp;
 	int nsym;
 
 	__asm __volatile("mov %0, sp" : "=&r" (sp));
 
 	frame.sp = sp;
-	frame.fp = (uint64_t)__builtin_frame_address(0);
-	frame.pc = (uint64_t)kcsan_md_unwind;
+	frame.fp = (uintptr_t)__builtin_frame_address(0);
+	frame.pc = (uintptr_t)kcsan_md_unwind;
 	nsym = 0;
 
 	while (1) {
diff --git a/sys/arm64/include/stack.h b/sys/arm64/include/stack.h
index db0d4ab38d4..53523bda3f3 100644
--- a/sys/arm64/include/stack.h
+++ b/sys/arm64/include/stack.h
@@ -33,9 +33,9 @@
 	((va) >= VM_MIN_KERNEL_ADDRESS && (va) <= VM_MAX_KERNEL_ADDRESS)
 
 struct unwind_state {
-	uint64_t fp;
-	uint64_t sp;
-	uint64_t pc;
+	uintptr_t fp;
+	uintptr_t sp;
+	uintptr_t pc;
 };
 
 int unwind_frame(struct unwind_state *);
diff --git a/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c b/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
index 082bd190427..d235ab6dab3 100644
--- a/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
+++ b/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
@@ -83,9 +83,9 @@ dtrace_getpcstack(pc_t *pcstack, int pcstack_limit, int aframes,
 
 	__asm __volatile("mov %0, sp" : "=&r" (sp));
 
-	state.fp = (uint64_t)__builtin_frame_address(0);
+	state.fp = (uintptr_t)__builtin_frame_address(0);
 	state.sp = sp;
-	state.pc = (uint64_t)dtrace_getpcstack;
+	state.pc = (uintptr_t)dtrace_getpcstack;
 
 	while (depth < pcstack_limit) {
 		if (!INKERNEL(state.pc) || !INKERNEL(state.fp))
@@ -281,9 +281,9 @@ dtrace_getstackdepth(int aframes)
 
 	__asm __volatile("mov %0, sp" : "=&r" (sp));
 
-	state.fp = (uint64_t)__builtin_frame_address(0);
+	state.fp = (uintptr_t)__builtin_frame_address(0);
 	state.sp = sp;
-	state.pc = (uint64_t)dtrace_getstackdepth;
+	state.pc = (uintptr_t)dtrace_getstackdepth;
 
 	do {
 		done = unwind_frame(&state);