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Fix the carry flag value for the CMP, CPX and CPY 6502 instructions

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The CPU manual states "the carry flag is set when the value in memory is
less than or equal to the accumulator, reset when it is greater than the
accumulator".
This commit is contained in:
Bastien Bouclet 2020-07-12 14:09:33 +02:00
parent c5a31bb129
commit fe90271558
1 changed files with 3 additions and 3 deletions
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6
Ghidra/Processors/6502/data/languages/6502.slaspec
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@ -233,7 +233,7 @@ ADDRI: imm16 is imm16 { tmp:2 = imm16; export *:2 tmp; }
local op1 = OP1;
local tmp = A - op1;
resultFlags(tmp);
C = (A < op1);
C = (A >= op1);
}
:CPX OP2 is (op=0xE0 | op=0xE4 | op=0xEC) ... & OP2
@ -241,7 +241,7 @@ ADDRI: imm16 is imm16 { tmp:2 = imm16; export *:2 tmp; }
local op1 = OP2;
local tmp = X - op1;
resultFlags(tmp);
C = (A < op1);
C = (X >= op1);
}
:CPY OP2 is (op=0xC0 | op=0xC4 | op=0xCC) ... & OP2
@ -249,7 +249,7 @@ ADDRI: imm16 is imm16 { tmp:2 = imm16; export *:2 tmp; }
local op1 = OP2;
local tmp = Y - op1;
resultFlags(tmp);
C = (A < op1);
C = (Y >= op1);
}
:DEC OP2 is (op=0xC6 | op=0xCE | op=0xD6 | op=0xDE) ... & OP2