Thanks Noel, Clem for your always generous and highly informative answers.
I'll digest that and enjoy using C routines in my assembly programs!
On Tue, 29 Jun 2021 at 06:37, Noel Chiappa <jnc(a)mercury.lcs.mit.edu> wrote:
> (I wrote a note, BITD, explaining how all
this worked; I'll upload
> to the CHWiki when I get a chance.)
along with simple examples of args and auto variables, which are both
referenced via the FP.
As a non-C consumer of printf, should I point R5
at some space for a
stack and call printf in the same manner as the C example I cited?
Not necessary to do anything with R5 (you can leave it blank); the only
a PDP-11 C routine needs are:
- a good stack
- the arguments, and return point, on the top of the stack
csv will set up the frame pointer, making no assumptions about the old
contents of R5 - see the source:
although it does save the old R5 contents, and restore them on exit.