Hi All. I'm having difficulty creating a Thumb-mode assembly language module that will successfully link in a uVision3+CARM project that is compiled in ARM mode. The module compiles, links and works fine with the rest of the project when everything is built in Thumb mode. Since CARM's calling convention and the module's internals conform with the ARM interworking veneer (or whatever it's called), it would seem to me that I could add PUBLIC FnName?A FnName?A to the existing PUBLIC FnName?T FnName?T PROC CODE16 in the Thumb assembly module so that the linker has an ARM-mode entry point into the function as well as its Thumb-mode entry point. But the function itself is purely Thumb mode, of course. Since the function is BL'd to, and the assembly module is written in Thumb and the function is EXEC16 (Thumb), its address is odd ([0]=1), and so the processor will successfully switch to Thumb mode from ARM when it executes the function via BL. Unfortunately, I'm having problems with the linker. Specifically, it's reporting alignment errors in other C modules in the project, if I build the entire project in ARM mode. Building in Thumb mode succeeds. The ARM docs (from ARM, not Keil) specifically mention an ALIGN assembler directive (see STM/LDM instruction summary examples). It seems to me that this might be the solution to my problem, if my problem is indeed due to a non-word alignment due to Thumb-mode instructions in an otherwise ARM build. Can anyone help? Thanks,