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[/] [zipcpu/] [trunk/] [sw/] [zasm/] - Rev 97

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97 Added longjump instructions. dgisselq 2356d 20h /zipcpu/trunk/sw/zasm/
96 Added the longjump functionality, so that the assembler will properly assemble
instructions to arbitrary 32-bit addresses.
dgisselq 2356d 20h /zipcpu/trunk/sw/zasm/
95 Fixed a bug whereby a mistaken code for CLR was masking a valid LDI of a large
integer value.
dgisselq 2359d 02h /zipcpu/trunk/sw/zasm/
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 2391d 21h /zipcpu/trunk/sw/zasm/
70 Updated the assembler support files, zopcodes in particular, to handle
the disassembly of the new very long instruction word codes.
dgisselq 2422d 23h /zipcpu/trunk/sw/zasm/
69 This implements the "new Instruction Set" architecture for the Zip CPU. It's
a massive change set, that touches just about everything but probably not
enough of everything. Please see the spec.pdf for a description of this
new architecture.
dgisselq 2429d 03h /zipcpu/trunk/sw/zasm/
60 Fixed assembler processing of jump instructions, so that the new fast
return instruction can be used. The test file was modified to test
pipelined value passing within the CPU. That's where the value gets
(re)used before being stored back in the register file. As of this release,
all tests work.
dgisselq 2490d 04h /zipcpu/trunk/sw/zasm/
55 A test was added to double check whether carry following right shifts worked.
This was a necessary part of getting two cycle linear feedback shift register
operations working for a memory test on a XuLA2 board. With this, I can now
verify that such feedback registers work for pseudorandom number purposes.
dgisselq 2500d 06h /zipcpu/trunk/sw/zasm/
54 This builds on the support for backslash character escapes in both single
and multicharacter expressions. Backslash character escapes are now
possible with quotations and backslashes, and the same code to interpret
the escapes is applied to both single and multicharacter sequences.
dgisselq 2500d 06h /zipcpu/trunk/sw/zasm/
53 Updated the #include/#define directives to work properly for nested includes.
(They were supposed to work properly for nested includes before ... and didn't)
This fixes those bugs.
dgisselq 2500d 06h /zipcpu/trunk/sw/zasm/
52 Added the capability to "see" character's encoded within a binary file,
by printing the character value(s) of each opcode (if they are printable)
on each line.
dgisselq 2500d 06h /zipcpu/trunk/sw/zasm/
51 Added the capability to look at binary files and 'see' characters as they
are encoded in memory.
dgisselq 2500d 06h /zipcpu/trunk/sw/zasm/
46 A series of updates associated with getting Dhrystone to work. Includes
updates to getting multiple files to link/work together within the assembler,
as well as getting quoted quotations to work in the lexer, and better
include file support in the preprocessor.
dgisselq 2509d 21h /zipcpu/trunk/sw/zasm/
39 Here's the documentation update to support the pipelined read/writes of
the bus from the CPU, as well as the test file that proved they worked.
dgisselq 2513d 00h /zipcpu/trunk/sw/zasm/
36 *Lots* of changes to increase processing speed and remove pipeline stalls.

Removed the useless flash cache, replacing it with a proper DMA controller.

"make test" in the main directory now runs a test program in Verilator and
reports on the results.
dgisselq 2522d 06h /zipcpu/trunk/sw/zasm/
34 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.)
dgisselq 2548d 01h /zipcpu/trunk/sw/zasm/
26 Added signed and unsigned multiply opcodes to the assembler.

An opcode was added for a 'negate' instruction. This is a derived instruction
that turns into two instructions. Neg RX becomes an XOR -1,Rx followed by an
Add 1,Rx command. (Move 1+Rx,Rx would've stalled the bus by one cycle.)

Instructions now keep track of the source linenumber (but not yet filename)
where they were issued. That way, upon an error in linking at the end, the
instruction can be referenced by the proper line number. (Filenames are still
not implemented, hence include files may reference the line number of the
include file with no proper indication of that ... yet).

The OBJFILE intrface now supports a clos() function. This allows the
assembler to close and delete the object file for those cases where the
preprocessor encounters an error.

The master test file, sw/test.S, was adjuted as follows: many of the tests
within it can be separated by #ifdef lines. Hence, if you only wish to test
whether or not CARRY works, undefine all of the other ifdefs but leave the
CARRY_TEST defined. (PUSH_TEST, a test of the PUSH(RX,SP) macro, still doesn't
work because the assembler still doesn't implement macros. This is still a
coming feature.)

The master test file now has tests for the break function, as well as for the
new trap CC bit and the new multiply signed and unsigned instructions in the
ALU.

Many error conditions were added to the assembler preprocessor. Now, if an
EOF is encountered in anything but the INITIAL state (not within a macro),
an error will be created. Likewise, any unrecognized preprocessor directive
will create an error.

The lexical analyzer now supports character values, such as 'a' or '\n' using
a C-type syntax. (Tri-graphs are not supported.) It also supports such
extended syntax as '$GPG'. (Hmm ... wonder why I needed that?)

The lexical analyzer now recognizes and properly supports #line preprocessor
output statements. Theselines are then used to track what source line errors
occurr at.

Operand precedence has been adjusted, so the assembler should be able to
properly handle things like 5+3*8 and get the same number answer as 3*8+5.
(This has been implemented, although not thoroughly tested.)

Upon completion of any preprocessing file, the assembler now checks the status
of the preprocessor as returned by its exit code. Anything other than a zero
status will cause the assembler to delete the resulting object code file it is
building and exit with an error.

The assembler also supports the '-d' command line flag to turn on debugging in
the yacc processor (setting yydebug). It'll produce a lot of debugging output,
but it just might help to figure out what 'syntax error' is actually taking
place.
dgisselq 2551d 18h /zipcpu/trunk/sw/zasm/
19 Here's the outlines of a debugger. dgisselq 2557d 18h /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 2557d 19h /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 2559d 01h /zipcpu/trunk/sw/zasm/

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