GP-1109 Fix 6502 SBC carry handling (Closes #3190, Closes #3189)

philpem · ghidra1 · commit 84492a89d6f1 · 2021-09-08T11:51:08.000-04:00
diff --git a/Ghidra/Processors/6502/data/languages/6502.slaspec b/Ghidra/Processors/6502/data/languages/6502.slaspec
@@ -420,7 +420,7 @@ ADDRI:  imm16   is imm16    { tmp:2 = imm16; export *:2 tmp; }
 :SBC OP1     is (cc=1 & aaa=7) ... & OP1
 {
 	local op1 = OP1;
-	local result = A - op1 - C;
+	local result = A - op1 - !C;
 	
 	subtraction_flags1(A, op1, result);
 	A = result;	

Original file line number	Diff line number	Diff line change
`@@ -420,7 +420,7 @@ ADDRI: imm16 is imm16 { tmp:2 = imm16; export *:2 tmp; }`
`420`	`420`	`:SBC OP1 is (cc=1 & aaa=7) ... & OP1`
`421`	`421`	`{`
`422`	`422`	`local op1 = OP1;`
`423`		`- local result = A - op1 - C;`
	`423`	`+ local result = A - op1 - !C;`
`424`	`424`
`425`	`425`	`subtraction_flags1(A, op1, result);`
`426`	`426`	`A = result;`