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Implemented the CHK and NEGX instructions

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This commit is contained in:
transistor 2022-09-12 22:19:01 -07:00
parent 9ff528c463
commit 873741846c
4 changed files with 43 additions and 17 deletions
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8
src/cpus/m68k/decode.rs
View File

@ -179,11 +179,9 @@ impl M68kDecoder {
if (ins & 0x040) == 0 {
let size = match get_size(ins) {
Some(Size::Word) => Size::Word,
// TODO 2021-12-14: the docs for the 68000 show the size field, even though it says it only operates on words
// and according to some other sources, it seems they are parsed and executed on the 68000, so
// I'm removing the check that only allows this on the MC68020
//Some(Size::Long) if self.cputype >= M68kType::MC68020 => Size::Long,
Some(Size::Long) => Size::Long,
Some(Size::Long) if self.cputype >= M68kType::MC68020 => Size::Long,
// On the 68000, long words in CHK are not supported, but the opcode maps to the word size instruction
Some(Size::Long) => Size::Word,
_ => return Err(Error::processor(Exceptions::IllegalInstruction as u32)),
};

36
src/cpus/m68k/execute.rs
View File

@ -381,8 +381,20 @@ impl M68k {
},
//Instruction::BKPT(u8) => {
//},
//Instruction::CHK(Target, Size) => {
//},
Instruction::CHK(target, reg, size) => {
let upper_bound = sign_extend_to_long(self.get_target_value(target, size, Used::Once)?, size) as i32;
let dreg = sign_extend_to_long(self.state.d_reg[reg as usize], size) as i32;
self.set_sr(self.state.sr & 0xFFF0);
if dreg < 0 || dreg > upper_bound {
if dreg < 0 {
self.set_flag(Flags::Negative, true);
} else if dreg > upper_bound {
self.set_flag(Flags::Negative, false);
}
self.exception(Exceptions::ChkInstruction as u8, false)?;
}
},
Instruction::CLR(target, size) => {
self.set_target_value(target, 0, size, Used::Once)?;
// Clear flags except Zero flag
@ -652,8 +664,24 @@ impl M68k {
self.set_compare_flags(result, size, carry, overflow);
self.set_flag(Flags::Extend, carry);
},
//Instruction::NEGX(Target, Size) => {
//},
Instruction::NEGX(dest, size) => {
let existing = self.get_target_value(dest, size, Used::Twice)?;
let extend = self.get_flag(Flags::Extend) as u32;
let (result1, carry1) = overflowing_sub_sized(0, existing, size);
let (result2, carry2) = overflowing_sub_sized(result1, extend, size);
let overflow = get_sub_overflow(0, existing, result2, size);
// Handle flags
let zero = self.get_flag(Flags::Zero);
self.set_compare_flags(result2, size, carry1 || carry2, overflow);
if self.get_flag(Flags::Zero) {
// NEGX can only clear the zero flag, so if it's set, restore it to whatever it was before
self.set_flag(Flags::Zero, zero);
}
self.set_flag(Flags::Extend, carry1 || carry2);
self.set_target_value(dest, result2, size, Used::Twice)?;
},
Instruction::NOP => { },
Instruction::NOT(target, size) => {
let mut value = self.get_target_value(target, size, Used::Twice)?;

14
tests/harte_tests/latest.txt
View File

@ -1,4 +1,4 @@
Last run on 2022-09-12 at commit 5a55aa7f63834a24aae1db195a0d3aa7d8943fb9
Last run on 2022-09-12 at commit 9ff528c4638b7b5757d110ba87c10ab60aa33557
ABCD.json completed: 301 passed, 7764 FAILED
ADD.b.json completed, all passed!
@ -26,7 +26,7 @@ BSET.json completed, all passed!
BSR.json completed: 4085 passed, 3980 FAILED
BTST.json completed: 8052 passed, 13 FAILED
Bcc.json completed: 5865 passed, 2200 FAILED
CHK.json completed: 0 passed, 8065 FAILED
CHK.json completed: 7744 passed, 321 FAILED
CLR.b.json completed, all passed!
CLR.l.json completed: 6882 passed, 1183 FAILED
CLR.w.json completed: 6862 passed, 1203 FAILED
@ -77,9 +77,9 @@ NBCD.json completed: 0 passed, 8065 FAILED
NEG.b.json completed, all passed!
NEG.l.json completed: 7552 passed, 513 FAILED
NEG.w.json completed: 7531 passed, 534 FAILED
NEGX.b.json completed: 0 passed, 8065 FAILED
NEGX.l.json completed: 0 passed, 8065 FAILED
NEGX.w.json completed: 0 passed, 8065 FAILED
NEGX.b.json completed, all passed!
NEGX.l.json completed: 7520 passed, 545 FAILED
NEGX.w.json completed: 7510 passed, 555 FAILED
NOP.json completed, all passed!
NOT.b.json completed, all passed!
NOT.l.json completed: 7512 passed, 553 FAILED
@ -125,5 +125,5 @@ TST.l.json completed, all passed!
TST.w.json completed, all passed!
UNLINK.json completed, all passed!
passed: 860483, failed: 139577, total 86%
completed in 16m 38s
passed: 891322, failed: 108738, total 89%
completed in 13m 52s

2
tests/harte_tests/previous.txt
View File

@ -1,4 +1,4 @@
Last run on 2022-09-11 at commit 42bfabb7434fdff65a1ccacced82ddc6597ed835
Last run on 2022-09-12 at commit 5a55aa7f63834a24aae1db195a0d3aa7d8943fb9
ABCD.json completed: 301 passed, 7764 FAILED
ADD.b.json completed, all passed!