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[/] [zipcpu/] [trunk/] [sw/] [zasm/] [zparser.cpp] - Rev 17

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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 2555d 02h /zipcpu/trunk/sw/zasm/zparser.cpp
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 2569d 17h /zipcpu/trunk/sw/zasm/zparser.cpp
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 2570d 15h /zipcpu/trunk/sw/zasm/zparser.cpp
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 2570d 22h /zipcpu/trunk/sw/zasm/zparser.cpp
2 An initial load. No promises of what works or not, but this is where the
project is at.
dgisselq 2571d 16h /zipcpu/trunk/sw/zasm/zparser.cpp

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