detection and marking of those areas into the TIA class itself, specifically
at the location of the write. In other words, there's no longer an IF
statement executed for every STx opcode; the marking is done directly
within the write to GRPx or PFx, so extra code is only executed when
actually storing to those locations.
Fixed several cases of opcodes marking an area as CODE when it should have
been DATA.
Added output to the CPU area of the debugger for displaying the source
address for loading data into the A/X/Y registers. Note that these are
only modified when actual addresses are used, so immediate and zero-page
mode will show addresses as zero (meaning that no address was involved
in retrieving the data).
Tweaked console font to better diffentiate the disassembly output between
graphics for players and graphics for the playfield.
Bumped state file format because of changes to M6502. This means old
state files will be broken.
Bumped version # for next test release.
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previously defined GFX directive is now used for player graphics
only). The 6502 core tracks each of these separately, which provides
for more accurate disassembly.
Modified debugger font and disassembler to show GFX and PGFX with
special characters, instead of using 'X' as Distella does. This also
allows gives much more informative disassembled outout.
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the various header files. Basically, I'm following advice from
Effective C++, and including only what's absolutely necessary. For
definitions that don't need to be included, the designation 'class xxx'
is used instead. This could potentially lead to faster compile times.
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currently done by remembering the addresses accessed on execution of
LDA/LDX/LDY, and marking them as GFX during a zero-page STA/STX/STY.
This is obviously as WIP and required much more testing, but I'm
pleasantly surprised by how useful it is so far.
Bumped version # for AtariAge test release.
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used as a peek operand). Still TODO is deal with poke areas, which would
be relevant in carts with extended RAM.
The interaction between the internal tracking and Distella is now much
tighter, in that knowledge gained by Distella is used in the core code,
and vice versa. This allows the best of both worlds, where the internal
tracking finds stuff at runtime (that couldn't be found in a static
analysis), and Distella tracks potential paths (that haven't occurred at
runtime yet).
Added 'type' debugger prompt command, which basically queries an address
for its disassembly type (CODE/GFX/DATA, etc).
Added debugger commands to query the last address used in an operation
for various registers, but they're only stubs at the moment.
Updated the bankswitch schemes to deal with accesses in and around the
hotspot areas. Previously, peek accesses in these areas weren't being
recorded as DATA areas.
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in general) into the emulation core. For now, this means integrating the
directive names into CartDebug, and having Distella using those same names.
The new directive names were determined by discussion with Omegamatrix on
AtariAge, and are listed in order of decreasing hierarchy:
SKIP (the 'bit' trick to skip over sections of code)
CODE (addresses accessible to the program counter)
GFX (addresses where data is loaded into TIA GRPx registers)
DATA (addresses referenced somewhere in the ROM)
ROW (addresses never referenced at all)
The next TODO item is to have the 6502 core set these values during emulation.
This is currently (crudely) done with a true/false setting in System::peek,
where true corresponds to CODE. This will be extended, so that false
corresponds to DATA. Eventually GFX will also be detected, by watching writes
to the TIA GRPx registers. Still to work out is how to detect SKIP sections.
Anything not marked with one of the above directives will be marked as ROW,
which essentially means ROM space that is never used. This will have the
nice side effect of detecting dead ROM space, potentially leading to space
optimizations.
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addresses used as part of code execution (ie, from the PC) during emulation.
This gives Distella much more information than can be determined from a
static analysis alone, resulting in an extremely accurate disassembly.
This also allows to generate very accurate debugger .cfg files.
Not all carts have been ported to this new scheme yet, particularly ones
having extended RAM that can be mapped out dynamically.
Note that this new scheme doubles the amount of RAM used for storing ROM
images, so up to 128KB extra will be used. There's also a small runtime
check for each instruction executed. Preliminary testing doesn't show
any slowdowns, but we'll see how it goes.
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'Stephen Anthony' (aka, me) in addition to Brad Mott as copyright
holders for Stella. I think I've been with the project long
enough now (almost 10 years) to justify being specifically mentioned
above and beyond 'the Stella Team'.
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classes. First off, the distella code has been integrated into a
DiStella class. This code isn't yet tied to the debugger, but it does
at least compile and generate valid output.
The RamDebug class has been replaced by a CartDebug class, which
takes responsibility for the previous RamDebug stuff as well as
things related to Cart address space (read from write ports,
disassembly, etc).
Fixed E7 bankswitching when reading from the write port in the upper
256byte area.
Fixed 'read from write port functionality' in general for all carts
that supported it previously. Basically, if _rwport is enabled, the
address is checked to be an actual read (vs. one that's part of a
normal write cycle), *and* it's actually an illegal access (each
cart/bankswitch type now provides a hint to indicate this condition).
Still TODO is clean up the rework, properly integrate DiStella, and
fix labels and defines (which seem to be completely broken).
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The license file is actually named 'License.txt', not 'license'
The 'Stella Team' has a capital T, not lowercase.
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will be integrated intp CpuDebug, which will also be merged with distella.
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stephena