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On 16.10.1998, at 11:48, Stuart Allen  wrote:
>I have discovered my problem. Whenever a computed goto is executed PCLATH
>must be set to match the current PC location, even if the source and
target
>of the jump have the same PCLATH value. This isn't neccessary if the
table
>is between 0 and 255 because PCLATH is zero.

Yap. This will lead to many problems. I've been trying to figure out how
to
write *relocatable* code. Implementing jump tables seems practically
impossible as the exact location is not know at the time of assembly.

Crossing table boundry is simple if you know the exact address: just set
the
PCLATH. However making the code which MPLAB would take seems hard.

Anyone figured out how to beat this one?

Yes, putting a jump table to eg. one known segment is one solution.
However,
accessing those from another object file is not possible. (Address of
external
variable is too complex for mplink to solve.)

Hints? Solutions? Anyone?


--
Harri Suomalainen     mailto:haba@cc.hut.fi

We have phone numbers, why'd we need IP-numbers? - a person in a bus