[stonefroot]

I want to be able to do this with assembly, e.g., see what is in each register as I step through the program.

[duaneb]

GDB can step through instruction by instruction, and you can easily examine registers.

[stonefroot]

Can I do this with a hand-written assembly program, i.e. not necessarily one that has been compiled with as and subject to GNU default optimisations or "constraints"?

[cfallin]

The commands you want are "stepi" (single-step one instruction), "disass" (disassemble at the current point in the program), and "info registers" (show you what's in all of the registers). These work equally well for hand-written assembly and for any arbitrary compiled program.

[stonefroot]

cfallin: many, many thanks.

I guess should read the gdb manual, and, if it's anything like the as manual (which I've learned is not always the full story), the source too.

[duaneb]

It's been many years since i've done hand-written assembly, so I can't say for sure, but it should be able to do instruction stepping on arbitrary programs.

[tene]

Yes.

[jfaucett]

like digitalinfinity says info registers should be what your looking for. Here's the docs: http://www.ofb.net/gnu/gdb/gdb_61.html

[prattmic]

You can use "layout asm" to see the dissassembly as you step through your program. "layout reg" will then split the view and show you the registers at the same time.

[digitalinfinity]

Doesn't info registers in gdb do this for you?