[R] How to reverse the axis direction in log plot?

[bluesky315 at gmail.com]

The following command gives me a plot where the axes are in log scale
but 'x' increases in the right direction.

plot(1:10,1:10, log='xy')

I want to change the plot such that it is still in log scale but 'x'
decreases rather increases in the right direction. I'm wondering if
there is an option to do so.