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2022-01-19sux.h: Corrected bitmask for `reg = &cpu->a;`.mrb0nk500
2022-01-18Add bitmasks for operations that mogrify (overwrite)mrb0nk500
memory directly.
2022-01-18Add bitmask for instructions that use the processormrb0nk500
status register.
2022-01-18Remove `pbits` from instruction handler.mrb0nk500
2022-01-18Initialize `tmp`, and `tmp2` to `0`, rather than `-1`.mrb0nk500
2022-01-18Add the rest of the load opcodes to the other registermrb0nk500
bitmasks.
2022-01-18Add `LDA` opcodes to accumulator bitmask.mrb0nk500
2022-01-16Add bitmasks for the registers.mrb0nk500
2022-01-14Consolidate reading addresses for non-indirect addressingmrb0nk500
modes into a single block.
2022-01-14Add bitmasks for indexing, and indirect addressing.mrb0nk500
2022-01-14Add bitmasks for reading data from memory, andmrb0nk500
immediate data.
2022-01-14Add bitmask for absolute addressing.mrb0nk500
2022-01-14Start work on new instruction handler macro.mrb0nk500
This macro will create a function for each opcode, but with only a single block of code for each one. It uses a bitmask (one bit for each opcode) that will evaluate which blocks of code are used by each opcode. The bitmask checks are (usually) evaluated at compile time, which means that each function will only have the blocks that had the bit for that opcode set in the bitmask.
2021-04-04- Fixed a bug to do with how SIB operands were parsedmrb0nk500
in the assembler. - Rewrote more of the SuB Suite to use the new calling convention. - Fixed a bug to do with SIB operands in the emulator's disassembler. - Made the MMV instruction not require a loop prefix for copying data.
2021-02-13- Reverted back one commit before the previous commit.mrb0nk500
This is because the previous commit actually created a bug, rather than fixing one. - Added JMP, and JSR to the ortho extension, and implemented them both in the assembler, and emulator.
2021-01-27- Fixed some bugs in the emulator.mrb0nk500
- 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`.
2020-12-09- Made the emulator's debugger use individual windows.mrb0nk500
I mainly did this to be able to display all 16 main registers, but also to simplify the debugger.
2020-12-09- Made the `set` instruction also set the Zero flag.mrb0nk500
This was done in order to save three bytes whenever you want to immediatly do a conditional branch after the `set` instruction.
2020-12-09- Implemented support for the `set` instruction in themrb0nk500
assembler. The main thing I had to do was implement the parsing of the condition code token, but that wasn't hard to do, since I had already done the lexing part already. The next thing to do, will be to design a calling convention for Sux.
2020-12-08- Fixed yet another bug with the ortho extension.mrb0nk500
2020-12-08- Fixed a bug with the ortho extension implementationmrb0nk500
in the emulator.
2020-12-08- Implemented support for the Orthogonal extension intomrb0nk500
both the assembler, and the emulator. I finally figured out how I could get support for the Ortho extension implemented into the old assembler. The only reason for doing this, is to buy me some while I start work on the new assembler, and to help me get an idea for how to do the same in the new assembler.
2020-11-20- Implemented support for Sux's base extension.mrb0nk500
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.
2020-11-20- Cleaned up a bit of the code.mrb0nk500
- Made the debug print for the CPU flags more readable. - Started work on implementing line number support into SuBAsm.
2020-10-06- Made the stack pointer 64 bit, rather than 16 bit.mrb0nk500
This is to allow for making the stack bigger for anything that needs to change the size of it. - Made the SuB Suite set the stack pointer to the end of the usable RAM, and allow for changing the stack size. In this case, the size of the stack is currently set to 192K, with the end of the heap being just below the stack.
2020-10-05- Fixed the rotate instructions.mrb0nk500
The carry flag is now set properly, and the rotation now is set properly by the carry flag, even for shift values greater than one. - Added a test program for properly testing the rotate instructions.
2020-10-05- Added a routine for testing the SuB Suite'smrb0nk500
implementation of free(), although it's commented out. - Removed the sbc() function from the emulator, since sbc can be done by just inverting the second operand of adc.
2020-10-04- Added support for reading, and writing outside themrb0nk500
emulator's memory. All reads outside of the emulator's memory give back $/0xFF bytes, while all writes outside of the emulator's memory are ignored. - Implemented malloc(), and free() in the SuB Suite. In order to do this, I had to add support for a heap, which I did by reserving the first 3 banks of the address space (the first 192K), and by adding a routine that finds the end of the RAM. In this case, I set the starting address for the routine at bank 3 (bank 4 with one indexing), but, the routine's starting address isn't hardcoded, and thus, any starting address can be passed as an argument. The routine uses the fact that we can now read/write outside the emulator's memory, and also uses the fact that writing outside the emulator's memory will be ignored, and that reading outside the emulator's memory will always read $/0xFF bytes, and uses that to signal that it's reached the end of the RAM. - Added a test program for getting the size of RAM starting at address $/0x20000.
2020-09-24- Fixed some more bugs with struct, and union handling.mrb0nk500
2020-09-21- Fixed some issues with how structs, and unions weremrb0nk500
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.
2020-09-18- Added support for structs, and unions to themrb0nk500
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.
2020-08-31- Optimized the memory read/write functions a bit more.mrb0nk500
- Added a memcopy() function, for later on.
2020-08-30- Did some more work on SuBAsm's lexer.mrb0nk500
- Optimized the memory read, and write functions. - Made the emulator faster, and cleaner in general.
2020-08-17- Fixed some bugs in the emulator's assembler.mrb0nk500
- Simplified the effective address functions. - Made SuBEditor a bit faster. - JSR, and RTS now support using the RS prefix, which is used to specify the return address size, with an RS prefix of 0 being a return address size of 64 bits, rather than 8 bits.
2020-08-13Refactored get_addr(), and all of the effectivemrb0nk500
address handling. It's now all done using several functions for each addressing mode, with the result being the effective address. I did this to make the codebase cleaner, and more readable.
2020-08-12- Refactored the escape sequence parsing, and handling.mrb0nk500
It now uses a struct to store the escape sequence. Before it handles the escape sequence, it parses it, which includes things like getting any arguments that are supplied, and getting the mode type. - Moved the code that handles control codes to a separate function. The reason for doing this was because I wanted to make the escape sequence handling faster, but also make the code more readable at the same time. I got the idea to do this from st, a terminal emulator created by the suckless.org project.
2020-08-11Refactored the keyboard I/O emulation, again.mrb0nk500
I decided to use keypad now, and create a function to return the actual key sequences. The keyboard I/O is also now being handled by the io emulation function, and not by the main function. This should get rid of any possible deadlocks.
2020-08-10Refactored the keyboard I/O emulation.mrb0nk500
It now saves the characters of the typed key into a buffer, and returns each character in the buffer one at a time, until it reaches a null terminator, at which point it starts getting the next key. The reason for doing this was to make getting multi character keys faster, by not calling getch() for each character. The only downside to this is that I have to set a timeout() for getch(), making it somewhat non blocking, although the delay is 8 milliseconds. The next thing I'll probably be doing, is working more on the SuB suite.
2020-08-08- Refactored the opcode table, in order to make themrb0nk500
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".
2020-08-08Did a ton of stuff.mrb0nk500
- 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.
2020-07-08- Simplified some parts of the codebase.mrb0nk500
- Fixed some bugs with the push, and pull functions - Fixed a bug in the assembler.
2020-07-06- Implemented a new opcode table.mrb0nk500
- Added a new preifx called the OF prefix, which adds the contents of a specific register to the current operand. - Added a table generator, which parses opcode table csv files.
2020-06-13Optimized, and cleaned up the codebase.mrb0nk500
2020-06-13Renamed get_opsize(), to get_addrsize(), in order tomrb0nk500
make it clear about what it does.
2020-06-13Make the registers single 64 bit uints, and convertmrb0nk500
all the value getting, and setting into macros. This is to make the codebase cleaner.
2020-06-11Did some more stuff.mrb0nk500
- 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. :)
2020-05-28Refactored the assembler, yet again, and implementedmrb0nk500
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.
2020-05-18Did alot of stuff while I was up at the family trailer.mrb0nk500
- 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.
2020-05-06Removed some duplicate code in the assembler, and mademrb0nk500
the processor status register, a union now.
2020-05-04Made all address decoding, and memory reads/writes bemrb0nk500
done with a union, in order to make it more readable.