long arch_ptrace()

in kernel/ptrace.c [730:827]
83 lines of code
15 McCabe index (conditional complexity)

long arch_ptrace(struct task_struct *child, long request,
		 unsigned long addr, unsigned long data)
{
	int ret;
	unsigned long __user *datap = (unsigned long __user *) data;

	switch (request) {
		case PTRACE_PEEKUSR:
			ret = ptrace_read_user(child, addr, datap);
			break;

		case PTRACE_POKEUSR:
			ret = ptrace_write_user(child, addr, data);
			break;

		case PTRACE_GETREGS:
			ret = copy_regset_to_user(child,
						  &user_arm_view, REGSET_GPR,
						  0, sizeof(struct pt_regs),
						  datap);
			break;

		case PTRACE_SETREGS:
			ret = copy_regset_from_user(child,
						    &user_arm_view, REGSET_GPR,
						    0, sizeof(struct pt_regs),
						    datap);
			break;

		case PTRACE_GETFPREGS:
			ret = copy_regset_to_user(child,
						  &user_arm_view, REGSET_FPR,
						  0, sizeof(union fp_state),
						  datap);
			break;

		case PTRACE_SETFPREGS:
			ret = copy_regset_from_user(child,
						    &user_arm_view, REGSET_FPR,
						    0, sizeof(union fp_state),
						    datap);
			break;

#ifdef CONFIG_IWMMXT
		case PTRACE_GETWMMXREGS:
			ret = ptrace_getwmmxregs(child, datap);
			break;

		case PTRACE_SETWMMXREGS:
			ret = ptrace_setwmmxregs(child, datap);
			break;
#endif

		case PTRACE_GET_THREAD_AREA:
			ret = put_user(task_thread_info(child)->tp_value[0],
				       datap);
			break;

		case PTRACE_SET_SYSCALL:
			task_thread_info(child)->abi_syscall = data &
							__NR_SYSCALL_MASK;
			ret = 0;
			break;

#ifdef CONFIG_VFP
		case PTRACE_GETVFPREGS:
			ret = copy_regset_to_user(child,
						  &user_arm_view, REGSET_VFP,
						  0, ARM_VFPREGS_SIZE,
						  datap);
			break;

		case PTRACE_SETVFPREGS:
			ret = copy_regset_from_user(child,
						    &user_arm_view, REGSET_VFP,
						    0, ARM_VFPREGS_SIZE,
						    datap);
			break;
#endif

#ifdef CONFIG_HAVE_HW_BREAKPOINT
		case PTRACE_GETHBPREGS:
			ret = ptrace_gethbpregs(child, addr,
						(unsigned long __user *)data);
			break;
		case PTRACE_SETHBPREGS:
			ret = ptrace_sethbpregs(child, addr,
						(unsigned long __user *)data);
			break;
#endif

		default:
			ret = ptrace_request(child, request, addr, data);
			break;
	}

	return ret;
}