The Old New Thing

October 20, 2008 - The Old New Thing

Off-Roading The Old New Thing

October 20, 2008 Oct 20, 2008 10/20/08
Raymond Chen
My friend ::Wendy:: decided that going off topic in the comments to this Web site was so much fun, she didn't want to let the Ground Rules stop her. So she created the Off-Roading The Old New Thing group, where people who get a thrill out of going off topic can do so without running afoul of this Web site's Ground Rules. Have fun, ...

Why can’t you thunk between 32-bit and 64-bit Windows?

October 20, 2008 Oct 20, 2008 10/20/08
Raymond Chen
It was possible to use generic thunks in 16-bit code to allow it to call into 32-bit code. Why can't we do the same thing to allow 32-bit code to call 64-bit code? It's the address space. Both 16-bit and 32-bit Windows lived in a 32-bit linear address space. The terms 16 and 32 refer to the size of the offset relative to the selector...