Subversion Repositories zipcpu

Last modification

• Rev 34, 2015-08-25 18:29:20 GMT
• Author: dgisselq

• Log message:

  Bunches of changes, although very little changed with the core itself.
  
  Regarding the core, some bugs were fixed within zipcpu.v (the CPU part of the
  core), so that the debugger can change the program counter. The debugger
  can now halt the CPU and then view, examine, and modify registers to include
  the program counter, although live changes to the CC register have not been
  tested.
  
  There was also a bug in the stall handling of the wishbone bus delay line. This
  has now been fixed.
  
  Moving outwards to the system, some parameters have been added to zipsystem
  to make it more configurable for whatever environment you might wish to place
  it within. Other minor clean ups have taken place, mostly to the internal
  documentation.
  
  Lots of changes, though, to the assembler. The big one is the implementation
  of #define macros, C style. Several buggy macros were in sys.i. These have
  been fixed. The Makefile has been adjusted so that the build of test.S, which
  depends upon sys.i, is now properly dependent upon sys.i for make purposes.
  Further, not only will zpp, the assembler preprocessor, handle #define macros,
  it will also recursive #defines. The assembler expression evaluator has also
  been updated to properly handle both operator precedence, as well as modulo
  arithmetic.
  
  The master system test file, test.S, found in the sw/zasm directory has been
  updated to reflect these new capabilities. (I really need to move it to the
  bench/asm directory, so you may expect that change sometime later.)