marcothms
5a61eb5fd6
ft(interpreter): use DS and SS sregs as correct segment offsets
2025-06-18 20:35:23 +09:00
marcothms
4aeacc649a
ft(interpreter): impl far jumps with correct CS addressing
2025-06-18 20:35:04 +09:00
marcothms
6678a1ef4a
chore(interpreter): fix small bugs
2025-06-18 20:33:52 +09:00
marcothms
53262f9e3e
ft(interpreter): impl shift and rotate
2025-06-18 20:33:52 +09:00
marcothms
7d5f891a93
ft: use instructionwidth instead of immediateoperand
...
Previously an immediate operand with data of 0 was use to encode
width, now use a dedicated enum for improved clarity.
2025-06-18 20:33:52 +09:00
marcothms
18cc460d40
ft: impl ret
2025-06-18 20:33:52 +09:00
marcothms
7f4d79d840
fix(interpreter): always read word from memory
...
It's not possible to know if a word or byte is requested, or rather
it would be a pain to retrieve that information.
It is much easier to just read a full word and then discard the top
half, if just a byte is needed.
2025-06-18 20:33:52 +09:00
marcothms
200640447b
ft(interpreter): impl basic call
2025-06-18 20:33:52 +09:00
marcothms
7e7e648fa8
fix(interpreter): wrong le byte order on pop
2025-06-18 20:33:52 +09:00
marcothms
1f5e175c68
chore(interpreter): rename Operand -> ArithmeticOperand
2025-06-18 20:33:52 +09:00
marcothms
5fab099cd8
ft(interpreter): impl push/pop
2025-06-18 20:33:52 +09:00
marcothms
d1ea96edd8
Update README.md
2025-06-17 16:40:24 +02:00
marcothms
bc9df97ea7
Update README.md
2025-06-17 15:35:13 +02:00
marcothms
5942270f63
ft(interpreter): impl all low-hanging fruit instructions
2025-06-11 23:29:34 +09:00
marcothms
4cea76bd1c
chore(interpreter): always sign-extend ImmediateOperand::Byte when cast
2025-06-11 17:40:38 +09:00
marcothms
7691b4b2ab
chore(interpreter): reduce code complexity
2025-06-11 17:04:34 +09:00
marcothms
e5e0edd713
ft(interpreter): impl mov
2025-06-11 16:59:15 +09:00
marcothms
269c4cc54b
ft(interpreter): impl adc and sbb
2025-06-11 16:31:07 +09:00
marcothms
11a365a8b1
ft(interpreter): set flags for arithmatic operations
2025-06-11 15:57:39 +09:00
marcothms
c9bf8fdc46
ft(interpreter): impl short jumps
2025-06-11 15:44:42 +09:00
marcothms
a4dc420d60
fix(disasm): only prepend ptr when modrmtarget is memory
2025-06-10 21:07:28 +09:00
marcothms
7479021d36
ft: impl most arithmatic ops, dec, inc
2025-06-10 20:57:31 +09:00
marcothms
037d74ac6a
fix: dont always flip sign_extend msb
2025-06-10 20:00:07 +09:00
marcothms
3756ada3e0
fix: correctly sign-extend instead of plain byte to word cast
2025-06-10 15:54:25 +09:00
marcothms
5529fc0b89
ft: impl flag setting closure for binary operations
2025-06-10 14:38:13 +09:00
marcothms
35fefb7625
ft(interpreter): generalize binary operations
2025-06-10 10:59:35 +09:00
marcothms
2b37884a60
fix: align interrupt data with minix src
2025-06-10 09:44:34 +09:00
marcothms
232b73aad8
chore: Rename Operand -> ImmediateOperand
2025-06-05 10:08:35 +09:00
marcothms
ef4663a245
ft: abstract and implement ADD::* interpretation
2025-06-04 23:01:04 +09:00
marcothms
ac69d75273
ft: initial work in interpreter
2025-06-03 21:31:28 +09:00
marcothms
5ee80c9364
fix: read data section as words, not bytes
2025-06-03 10:30:35 +09:00
marcothms
4c63b7a21a
ft: add dump flag
2025-05-28 16:00:18 +09:00
marcothms
7e8fdeba54
ft: implement missing lock instruction
2025-05-28 14:23:56 +09:00
marcothms
a21cc2b4b3
ft: add debug script
2025-05-28 14:13:12 +09:00
marcothms
c396d33f76
fix: align pointer parsing with spec
...
Previously pointer parsing was completely wrong.
Now split into Pointer32 for immediates with
segment;offset and Pointer16 for short jumps, which
use DS or ES as segment and the Pointer16 value
as offset.
2025-05-28 13:31:14 +09:00
marcothms
0893969f4e
chore: whole swoop of enhanced documentation
2025-05-28 09:41:40 +09:00
marcothms
322a276617
fix: dont interpret padding as instructions
...
a.out padds the text section with 0-bytes, which where interpreted
as 0x00 0x00 instruction and occasionally as a single 0x00 byte. Add
logic to ignore single 0x00 bytes and to remove dangling 0x00 0x00
instructions at the end of the instruction vec, so only the 'actual'
instructions are presented in the end. Also adjust visibility of
methods, so only the truncated instructions will ever be presented.
Of course, this could remove an actual `0x00 0x00` instruction from the
end, but they would not have any effect on execution anyway.
2025-05-27 11:13:16 +09:00
marcothms
5c8702fb95
fix: only push raw instruction once
2025-05-27 09:37:57 +09:00
marcothms
3463b5b4ae
chore: fix panic
...
ModRM parsing still used old parsing style.
2025-05-27 09:21:40 +09:00
marcothms
8ea91d80b8
ft: add first basic test
2025-05-25 21:20:12 +09:00
marcothms
35207d23f0
chore: add nice debug output
2025-05-25 21:06:47 +09:00
marcothms
f9ae0dc6ee
chore: move pointer parsing function to disasm module
2025-05-25 20:31:55 +09:00
marcothms
74e936ab76
chore: replace all panic's with proper error propagation
2025-05-25 15:45:09 +09:00
marcothms
73b1a99cbd
ft: Implement memory pointer (Mp) operand
2025-05-25 11:00:47 +09:00
marcothms
6762195378
chore: show raw pointer value in disasm
2025-05-25 10:27:32 +09:00
marcothms
90fb88aec6
chore: fix byte/word size ambiguitis in disasm output
2025-05-25 10:09:23 +09:00
marcothms
058afeb7ba
chore: split up some structs and add comments
2025-05-20 18:59:09 +09:00
marcothms
48eeff16fa
chore: align disasm print more with objdump(1)
2025-05-20 11:28:23 +09:00
marcothms
beccff0d79
chore: update metadata
2025-05-20 11:22:35 +09:00
marcothms
1173dd3d63
chore: output parity for hex
...
Output all immediate bytes and words as hex.
2025-05-20 11:02:46 +09:00
marcothms