jrd
a4e5d03e22
emu: use mask, not mod for ROL/ROR CF calc. No flags when SHL/SHR=0
2021-03-31 01:39:14 -07:00
jrd
a789b7e87d
emu: flags: make CF & OF always lazy. Remove Flags::update_of()
...
Rotate ops now backup flags manually into their enum data instead of
converting everything to eager mode
2021-03-30 01:58:08 -07:00
jrd
984ff891c0
emu: Make FlagOp enum algebraic to carry op-specific data
...
Avoids writing operand data for lazy flags that won't be read
2021-03-30 01:35:35 -07:00
jrd
d8600151d6
emu: ROL/ROR operations
2021-03-30 01:35:29 -07:00
jrd
f5ab9cfad2
emu: terser names for form= directives
2021-03-29 00:33:53 -07:00
jrd
40fed58ecf
emu: remove unsafe from {push,pop}_modrm operations
2021-03-29 00:22:56 -07:00
jrd
7c7f74a65b
emu: make string ops generic over operand size
...
After many attempts, it turns out this is as easy as remembering that
where clauses can bound non-parameter types
2021-03-28 14:46:35 -07:00
jrd
a183a5ad38
emu: SHL/SHR/SAR opcodes (BARELY TESTED!), const Op Directive
...
Carry Flag as yet untested and likely to contain bugs
2021-03-28 02:08:23 -07:00
jrd
874fc6adbc
emu: Make flags lazy, implement parity flag & JPE/JPO ops
2021-03-27 01:00:29 -07:00
jrd
e15fb6ae27
Squelch warning about intersperse() entering stdlib.
...
Presumably we'll want to switch to it when it standardizes, so we want
the build to break when it's time to move over.
2021-03-27 00:59:04 -07:00
jrd
4b5d85352a
emu: move cpu Flags into own module
2021-03-27 00:58:51 -07:00
jrd
5d2fbcd01d
emu: Remove LValue implementation for u16
...
I think this was from when registers were passed by mut ref and this
could update them in place. Now they are wrapped and those wrappers
are LValues instead.
2021-03-24 20:37:55 -07:00
jrd
8c359d2c70
emu: Use type arguments instead of PhantomData to disambiguate
...
Allows elision of op directive when operands are of unambiguous width
2021-03-24 20:34:08 -07:00
jrd
88166c5a85
emu: remove duplicate @rep arg decoder rule
2021-03-24 01:38:11 -07:00
jrd
017eaf2955
emu: Hack in push/pop support for ModR/M. UNSAFE, and maybe UNSOUND.
2021-03-24 01:12:32 -07:00
jrd
cf9d2dd15d
emu: Pass [LR]Values by value instead of by &mut
...
I think this made sense originally because registers were being passed
as borrows directly out of the cpu struct. Now they have wrappers
around Cell refs, and those wrappers can be passed directly.
2021-03-22 22:21:03 -07:00
jrd
9b0b4efc40
emu: update si in cmps[bw] string loop [bugfix]
2021-03-22 22:19:48 -07:00
jrd
ff7e8a7fb9
emu: INC/DEC opcodes. width={byte,word} argtypes for disambig
...
Also made all LValues also RValues for brevity (so INC/DEC don't have
to bound their destination arguments by both, but this is not required
if it causes problems for some reason down the road).
2021-03-19 00:07:49 -07:00
jrd
c8d6a3312a
emu: near/short JUMP instructions. Use u16+wrapping_add for all rels
2021-03-18 02:16:15 -07:00
jrd
d6e645cae7
emu: use wrapping_add in displacement address as operand can be neg
2021-03-18 01:43:22 -07:00
jrd
73c537183e
emu: Rename "Addr" to "FarPtr"
...
It was a little confusing with the "Address" trait. And FarPtr carries
with it a segment.
2021-03-18 00:38:06 -07:00
jrd
3b746b75ec
emu: PUSH/POP opcodes, reimpl RET as just "POP IP"
...
This also promotes CALL/RET to actually using the bus for
addressing (because it goes through the generic PUSH/POP code), which
is probably more correct anyway.
2021-03-18 00:32:08 -07:00
jrd
dcf96ec5b3
emu: Operand trait over u8/u16, d8_as_d16 argtype
2021-03-17 21:50:02 -07:00
jrd
ae1f3da4b2
emu: UNTESTED string ops, CMP instruction
...
Likely to be a bugfest.
There's a flags macro for now but unclear how useful it will turn out
to be in practice. Flags in particular need testing.
Also disappointing that I couldn't make instructions generic across
u8/u16, especially for ordinary, non-string CMP. Need to look into
this more to see if it can be done with num-traits or some other
trickery.
2021-03-17 21:37:03 -07:00
jrd
04348a816e
emu: Fake opcode ASSERT for testing
2021-03-12 22:19:45 -08:00
jrd
0c55ff9b36
emu: modrm displacement, LEA instruction
2021-03-12 08:01:28 -08:00
jrd
adb7e672d9
emu: accept cycle cost for modrm spec (and ignore for now)
2021-03-12 04:10:15 -08:00
jrd
c372a96b7c
emu: all MOV opcodes (no modrm base/index/displacement modes yet)
2021-03-12 04:02:27 -08:00
jrd
0a4b240974
emu: fix copypasta where write_lo actually did write_hi
2021-03-12 02:54:44 -08:00
jrd
ac7b3b16a1
emu: factor out utils into own module
2021-03-12 02:27:00 -08:00
jrd
27bc36f9d2
emu: factor out operations and operands into own module
2021-03-11 22:55:51 -08:00
jrd
b950a56d26
emu: segment prefix, addr Arg decoder, Addr arg trait, NOP opcode
2021-03-11 05:55:07 -08:00
jrd
71bcec1574
emu: wrap cpu regs in Cell. r16 addr mode.
...
r16 + modrm16 allowed cpu regs to alias. Wrap them in Cell to allow
this. We also create a Reg wrapper when passing regs so that we can
pass as &mut while simultaneously having other references to the same
reg.
2021-03-10 07:16:08 -08:00
jrd
49789c74f9
emu: show/peek debug instructions
2021-03-09 06:42:12 -08:00
jrd
20bfc45dae
emu: modrm16 arg decoder
2021-03-08 06:20:20 -08:00
jrd
3f2c12a83c
emu: machinery for ModRM propegation
2021-03-08 06:17:45 -08:00
jrd
eeaf713470
emu: dos exit service.
...
Just calls process::exit() for now
2021-03-06 23:48:00 -08:00
jrd
e1a6feb6f5
emu: Factor out hi/lo register access
2021-03-06 23:47:56 -08:00
jrd
1e32036bf7
emu: INT instruction, standalone dos function for now
2021-03-06 05:26:40 -08:00
jrd
0f4e52697a
emu: reghi & d8 address modes. make next_ip assoc instead of member
...
next_ip would borrow all of the cpu, now we just need IP and CS.
2021-03-06 04:52:09 -08:00
jrd
b2aa3fd0e0
emu: MOV generic. Drop Reg16 register wrapper type
2021-03-06 04:18:48 -08:00
jrd
be7e926842
emu: dump register file on unimplemented opcode
2021-03-06 02:10:25 -08:00
jrd
fa49d19ae0
emu: arg=rhs parsing. d16, reg, regval argtypes. non-generic MOV.
2021-03-06 01:09:17 -08:00
jrd
5c39f3b5af
emu ops can get multiple args, mem no longer implicit, implement RET
2021-03-06 01:09:07 -08:00
jrd
639e05edac
basic emu skeleton and loop, CALL instruction & rel16 addr mode
2021-03-06 01:08:19 -08:00
jrd
1c15695c4b
Explicitly name window size constant
...
separating out and committing pieces in an old WIP. Don't know what
specifically prompted this change.
2021-02-11 06:33:03 -08:00
jrd
a91ee62190
cleanup warnings/weird code
2021-02-11 01:31:04 -08:00
jrd
ede85ecb5d
bitrot: update for nalgebra deprecations
2021-02-11 01:30:51 -08:00
jrd
82c53bb761
bitrot: update for lang/stdlib deprecations
2021-02-11 01:30:05 -08:00
jrd
9dd48d359c
bitrot: replace bare traits object syntax with dyn traits
2021-02-11 01:30:01 -08:00
jrd