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- Started work on implementing the Super VIA emulation.
- Added support for disabling disassembly per
instruction, when in debug mode.
- Did some more work on rewriting the SuB Suite to
work with the new calling convention.
- Rewrote the symbol handling code in the emulator's
assembler, to make it both simpler, and to add
support for arbitrarily deep symbol scopes.
- Added support for arbitrarily deep local symbol
scopes.
For example, to declare a symbol of depth 2, you add
two '@' characters to the start of the symbol name.
In other words, the number of '@' characters before
the symbol name is what determines the scope of that
symbol.
And to use a symbol thats outside the current
scope, you would use the same syntax as using a
struct member, so you would do `global.local`.
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This is the biggest milestone I've reached for this
project, since the base extension changes alot about
what Sux can do by default, and now makes it a viable
instruction set for modern day use, when compared
with other instruction sets.
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- Made the debug print for the CPU flags more
readable.
- Started work on implementing line number support
into SuBAsm.
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handled.
- Added a function called fix_symtree(), which when
called. will rearrange the symbol tree based on the
order they're declared in by the token stream.
The reason I wrote this, was to make sure the symbol
tree could be printed correctly.
- Optimized print_symtree() to now use tail recursion.
- Started adding all of the SuB Suite's structs.
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emulator's assembler.
- Make the symbol table a doublely linked list, in
both ways.
- Optimized the memcopy() function.
- Changed the benchmark timing, to now use a timer, and
stops once the timer reaches zero.
When the timer hits zero, it sends SIGALRM to the
main function, which tells the emulator that the
benchmark is done.
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spaces, and tabs before the current token.
Along with also now storing a sub-token count which
is used in case the token's secondary id is meant to
be treated as a sub-token.
- Added suppor for saving the number of blank lines
before the current tokenized line.
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expressions to the emulator's assembler.
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instruction formatting simpler.
- Refactored the instruction table of the emulator's
assembler, it now has two parts, the addressing mode
bits, and the base value.
The base value is what's used to generate the actual
opcode, with the addressing mode bits telling the
assembler what addressing modes this instruction
supports.
The reason for doing this was to use less space. For
comparison, the previous version used 870 bytes for
the instruction table, while the new version uses
only 222 bytes. The new version is nearly 4 times
smaller than the pervious version.
- The B register based ALU instructions now use their
own addressing mode, and are specified by using 'b'
as the operand for those instructions.
For example, to add the Accumulator with the B
register, you now use "ADC B" instead of "AAB".
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- Changed the file structure of the SuB Suite, so that
all variable declarations, symbols, and constants
are in a single file.
- Moved the C library functionss into a separate
file, and made them use stack frames.
- Added support for using the emulator's assembler for
realtime debugging, to enter it, get in to stepping
mode by pressing Ctrl+s, press any other key, then
press F1,
The reason for having to press some other key before
pressing F1 is because it only allows entering the
assembler when the keyboard is not ready.
- Added the ".res" directive to the emulator's
assembler, the ".res" directive tells the assembler
to reserve however many bytes specified by the
operand.
- Fixed some bugs in the emulator's assembler.
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- Fixed some bugs in the emulator's assembler.
- Worked on SuBAsm's lexer some more.
- Created a new directory for the SuB suite, and moved
all of the SuB suite's files in there.
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- Fix some bugs with strings.
- Started to refactor the instruction functions.
- Added support for using RS prefixes on the memory
based increment, and decrement instructions.
- Started work on SuBAsm's lexer.
Have fun looking at this, BieHDC. :)
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- Refactored the symbol, and fixup table to now use a
linked list
- Added support for local symbols to the assembler.
- Rewrote SuBEditor, and SuBAsm to use local symbols.
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code duplication.
The assembler now uses pre-tokens, which are smaller
tokens, that make up the larger tokens.
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support for comma separated values.
The assembler now uses a linked list of tokenized
lines, each containing a linked list of tokens for
that line.
I also moved all of the large tables into the higher
parts of memory, in order to free up the lower part of
memory for the user.
Comma sepparated values only work with directives, and
only with the byte", word, dword, and qword directives.
I also added support for getting the upper, and lower
halves of an address. The tokens for both of those are
'<', and '>' respectively.
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- Moved the large enums, and large tables into separate
header files.
- Added enums for implementing the base extension
- Fixed a bug in the assembler.
- Worked more on SuBAsm.
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assembler.
Single quote marks works in the assembler just like
they do in C, except that it only supports a handful
of escaped characters, like '\n', and '\r'.
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functions.
I did this to make it more readable, while still
making it fast, due to inlining it.
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emulator's assembler.
And removed three pointers, and the linewrap table
from zero page, in SuBEditor.
I moved the linewrap table to address $1000.
And because of finally adding include support to the
assembler, I can now start work on SuBAsm!
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emulator some more.
I optimized the emulator by replacing the main loop
from a conditional while loop, to an unconditional for
loop.
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emulator smaller, and faster.
I am also starting to make SuBEditor's source code
more readable.
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It now has a lexer/tokenizer, along with a parser.
I have also made the emulator even smaller.
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efficient, and ported SuBEditor to C.
I revamped the opcode table to add another prefix bit
for the addressing mode, finally giving access to all
addresses, without wasting any bytes.
I made the stack based operations more efficient, by
sort of applying Duff's device to it.
And I ported SuBEditor to C, to make it easier for me
to figure out how to implement SuBAsm.
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We're now Free Software!!!
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for use of the B register as an operand, for ALU based
instructions.
This allows for both low code size, and high
performance.
This means we can save upto 9 bytes, by just using
the B register for ALU operations, rather than using a
memory address.
The indirect addressing modes, give Sux the abillity
to now use pointers.
Hope you guys have a Merry Christmas!
From mr b0nk 500 <b0nk@b0nk.xyz>
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monitor, and the cursor movement routines for SuBAsm.
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remainder during a DIV instruction.
I also added the TAB, and TBA instructions, for
transfering between the Accumulator, and the
B register.
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I also added the WAI instruction, which puts the thread
that executed it, into a catatonic stat, where it can't
do anything, until an interrupt occurs.
I will be starting work on GFsuX next.
I also might start work on SuBAsm, the
Sux Bootstrapping Assembler.
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the suffix.
I added this because BieHDC said the already existing
notation glowed in the dark too much.
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I also added the ASR instruction, for doing arithmetic
shifts, and have added a hello world program.
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AKA, referencing a label before it has been declared
yet.
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monitor.
I also rewrote the fibonacci program to include lables.
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between the three main registers.
These instructions are:
TAY: Transfer Accumulator to Y.
TAX: Transfer Accumulator to X.
TYX: Transfer Y to X.
TYA: Transfer Y to Accumulator.
TXA: Transfer X to Accumulator.
TXY: Transfer X to Y.
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I have also added a program that computes the
Fibonacci sequence that I wrote in Sux assembly.
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Any instructions that either have a register size of
8 bits, use implied addressing, or branch can save a
byte by disabling the prefix byte.
It does this by checking if the first three bits are
all set to 1.
If true, then it will treat it as a prefix
byte, otherwise, it will treat it as an opcode.
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Added a prefix byte to tell the CPU certain
information such as, how many bytes to load into the
registers, or what ISA extension we want to use.
I also added an assembly language monitor, so that I
don't have to write stuff in machine code.
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