30 Apr
2008
30 Apr
'08
3:55 p.m.
In your example, -(sp) = r5; r5 = pc; pc = guestf.
Guestf will have to bump r5 as in consumes the parameters.
Rts r5 means pc = r5; r5 = (sp)+.
Hope this helps.
Warren Toomey wrote:
All, I'm trying to write a PDP-11 disassembler
for a.out files. I'm having
trouble dealing with jsrs. Take, for example, the code here:
http://minnie.tuhs.org/UnixTree/1972_stuff/s1/frag19.html
I can happily deal with the jsr pc,do type of jsr, but the ones
involving r5 have me stumped, e.g.:
jsr r5,questf; < nonexistent\n\0>; .even
It appears that data is being inserted into the executable directly
after the jsr instruction. How does the rts which returns from the jsr
know how much data to skip, and what is the involvement of r5 here?
Thanks,
Warren
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