// Uncomment the following line to enable kernel stack unwinding within gator, note it can also be defined from the Makefile
// #define GATOR_KERNEL_STACK_UNWINDING
static void kernel_backtrace(int cpu, struct pt_regs *const regs)
{
#if defined(__arm__) || defined(__aarch64__)
#ifdef GATOR_KERNEL_STACK_UNWINDING
	int depth = gator_backtrace_depth;
#else
	int depth = 1;
#endif
	struct stackframe frame;
	if (depth == 0)
		depth = 1;
#if defined(__arm__)
	frame.fp = regs->ARM_fp;
	frame.sp = regs->ARM_sp;
	frame.lr = regs->ARM_lr;
	frame.pc = regs->ARM_pc;
#else
	frame.fp = regs->regs[29];
	frame.sp = regs->sp;
	frame.pc = regs->pc;
#endif
	walk_stackframe(&frame, report_trace, &depth);
#else
	marshal_backtrace(PC_REG & ~1, NO_COOKIE);
#endif
}
static int report_trace(struct stackframe *frame, void *d)
{
	struct module *mod;
	unsigned int *depth = d, addr = frame->pc, cookie = NO_COOKIE, cpu = smp_processor_id();

	if (*depth) {
		mod = __module_address(addr);
		if (mod) {
			cookie = get_cookie(cpu, per_cpu(backtrace_buffer, cpu), current, NULL, mod, true);
			addr = addr - (unsigned long)mod->module_core;
		}
		marshal_backtrace(addr & ~1, cookie);
		(*depth)--;
	}

	return *depth == 0;
}
static int report_trace(struct stackframe *frame, void *d)
{
	unsigned int *depth = d, cookie = NO_COOKIE;
	unsigned long addr = frame->pc;

	if (*depth) {
#if defined(MODULE)
		unsigned int cpu = get_physical_cpu();
		struct module *mod = __module_address(addr);
		if (mod) {
			cookie = get_cookie(cpu, current, mod->name, false);
			addr = addr - (unsigned long)mod->module_core;
		}
#endif
		marshal_backtrace(addr & ~1, cookie);
		(*depth)--;
	}

	return *depth == 0;
}
// Uncomment the following line to enable kernel stack unwinding within gator, note it can also be defined from the Makefile
// #define GATOR_KERNEL_STACK_UNWINDING
static void kernel_backtrace(int cpu, int buftype, struct pt_regs * const regs)
{
#if defined(__arm__)
#ifdef GATOR_KERNEL_STACK_UNWINDING
	int depth = gator_backtrace_depth;
#else
	int depth = 1;
#endif
	struct stackframe frame;
	if (depth == 0)
		depth = 1;
	frame.fp = regs->ARM_fp;
	frame.sp = regs->ARM_sp;
	frame.lr = regs->ARM_lr;
	frame.pc = regs->ARM_pc;
	per_cpu(backtrace_buffer, cpu) = buftype;
	walk_stackframe(&frame, report_trace, &depth);
#else
	marshal_backtrace(PC_REG & ~1, NO_COOKIE);
#endif
}