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[/] [zipcpu/] - Rev 104

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104 An updated build script, actually builds zip-gcc. dgisselq 3060d 03h /zipcpu/
103 A barely functional, but somewhat working, version of GCC to check in.
If the Lord is willing, it should be accompanied by a newlib port soon.
That port should move the GCC status from barely functional but somewhat
working to functional and working, although not (yet) complete.
dgisselq 3060d 07h /zipcpu/
102 Updated bugfix version of the binutils patch, and a first patch of GCC.
The GCC patch is undergoing ongoing and active development. It is also known to
continue to contain active bugs. (It's not done yet.)
dgisselq 3062d 16h /zipcpu/
101 Adjusted the "BREAK" instruction so that it will now disassemble properly
with an operand. This was necessary to create a (trap_if ...) instruction
for the GCC compiler.
dgisselq 3064d 18h /zipcpu/
100 Some changes to support early branching: branches are now ADD #x,PC instructions
instead of MOV #x(PC),PC--providing greater range to the CPU. When that range
is insufficient, ZPARSER now recognizes long jump instructions coded as
LOD (PC),PC followed by the jump address. (This change was made necessary by
the need to build an assembler/linker that could create instructions that would
jump to any address in the 32-bit address space. In short, a part of the
ongoing GCC upgrade and rework.)
dgisselq 3064d 19h /zipcpu/
99 Added big-endian versus little-endian functionality. You can now specify which
your input file is as a command line parameter, and zdump will properly
disassemble the file.
dgisselq 3064d 19h /zipcpu/
98 Added justed longjump instructions from the previous (not used, broken)
functionality to the new LOD (PC),PC functionality.
dgisselq 3064d 19h /zipcpu/
97 Added longjump instructions. dgisselq 3064d 19h /zipcpu/
96 Added the longjump functionality, so that the assembler will properly assemble
instructions to arbitrary 32-bit addresses.
dgisselq 3064d 19h /zipcpu/
95 Fixed a bug whereby a mistaken code for CLR was masking a valid LDI of a large
integer value.
dgisselq 3067d 01h /zipcpu/
94 These changes make it possible to build binutils-2.25/ here in this
directory. "make binutils" should be all that is necessary to build the
entire binutils package for the Zip CPU.

The default configure script, run from gas-script.sh below, will build and
install these utilities in an install/ subdirectory made below sw/.
dgisselq 3091d 22h /zipcpu/
93 A BINUTILS BACKEND IS NOW AVAILABLE!!!! dgisselq 3099d 20h /zipcpu/
92 Adjustments made to match the simplified early branching. dgisselq 3099d 20h /zipcpu/
91 Minor updates. dgisselq 3099d 20h /zipcpu/
90 Removed MOV x(PC),PC from the list of possible early branching instructions.
ADD X,PC and LDI X,PC are now the only recognized early branching instructions.
This was done to spare logic, although I don't think I spared more than a
LUT or two.
dgisselq 3099d 20h /zipcpu/
89 Minor changes, to include making default branching an ADD.[condition] X,PC
instruction, rather than allowing both MOV X(PC),PC and ADD X,PC instructions.

Further zopcodes.cpp contains several bug fixes.
dgisselq 3099d 20h /zipcpu/
88 Eliminated some warnings. The div fixes were to simplify the logic, even though
the result is less readable ...
dgisselq 3123d 19h /zipcpu/
87 Adjusted the operator input line to reflect actual logic inputs, rather
than the registered inputs which may have been out of date. (Indeed, they
were out of date for the bug I was chasing and fixed ...)
dgisselq 3125d 18h /zipcpu/
86 Removed the requirement to have the dev.scope.cpu hardware defined outside
of the Zip CPU (it was defined in another project). This was causing a bus
error in the simulator (which it should have), but taking it out fixes things
in the simulator (while removing capability from one special piece of H/W).
dgisselq 3125d 18h /zipcpu/
85 Minor update/correction to operand B definition. dgisselq 3125d 18h /zipcpu/

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