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[/] [zipcpu/] [trunk/] [sw/] [zasm/] - Rev 19

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19 Here's the outlines of a debugger. dgisselq 2554d 01h /zipcpu/trunk/sw/zasm/
17 The ZOPCODES function zipi_to_string (ZIP CPU instruction to string, part of
the machine code dump) was adjusted to have closer to a fixed width output.
It no longer uses tab characters, which can have an unreliable effect.
dgisselq 2554d 02h /zipcpu/trunk/sw/zasm/
16 The assembler now supports:
1. Multiple data elements on a line. These are lines like:
WORD 5,8,4,1
which place the words 5, 8, 4, and 1 directly into the object code to be
referenced as data. Prior to this release, these lines would assemble
properly but only place '5' as a data element into the object code.

2. The '-E' preprocessor only directive is now supported to produce output
from the preprocessor and see what is (or is not) happening there.

3. The preprocessor now validly places "#line" comments into the file, which
the assembler picks up and uses in it's error codes. These help identify
where errors took place.

4. Zasm now looks for the preprocessor (zpp) in the same directory zasm was
run from, using the same directory prefix as zasm, whenever zasm is given such
a directory prefix.

And ... perhaps other things I've forgotten about.
dgisselq 2555d 08h /zipcpu/trunk/sw/zasm/
14 Removing zasm.cpp--the old assembler that never worked well. dgisselq 2557d 15h /zipcpu/trunk/sw/zasm/
13 Finally! The beginnings of the new assembler. It's not really polished yet,
and it is quite clunky, but it works!! (Lots of bugs and features left to
fix/implement: #include, #define macro(), #line tracking through the
preprocessor, a means of finding include files (and the preprocessor!) and
more. But, as a beginning, the basics are functinoal.
dgisselq 2557d 15h /zipcpu/trunk/sw/zasm/
12 Bunch of changes while trying to get a hello world program:
1. Right shifts by 32 or more now result in zero, or all of the top bit in the
case of ASRs.
2. zdump now properly includes addresses with dumped lines.
3. zparser now properly handles immediate values via the .DAT instruction.
dgisselq 2572d 07h /zipcpu/trunk/sw/zasm/
9 This checkin is the result of a watchdog timer test, and everything it took
to get the watchdog timer working. The timer function was simplified,
although it now uses a touch more resources--being able to count down 31
bits instead of 30. The parser was modified, since it couldn't handle
storing to register plus offsets like it was supposed to be able to. The
testbench, zippy_tb, was modified to accept an assembled machine code file
such as I might place on a board to test it.

Lots of work to get it working.

Looking at the files below, it looks like I'll need a second check in to check
in the watchdog timer test itself.
dgisselq 2573d 04h /zipcpu/trunk/sw/zasm/
8 Fixed the rotate left instruction to work in the zasm parser, and to be
properly referenced in the simulator. The instruction set documentation was
also adjusted to reflect what the CPU actually does.
dgisselq 2573d 11h /zipcpu/trunk/sw/zasm/
2 An initial load. No promises of what works or not, but this is where the
project is at.
dgisselq 2574d 05h /zipcpu/trunk/sw/zasm/

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