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Implement all ops, except for macros, _adc, _cp, _inc, _sbc

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This commit is contained in:
Takashi Toyoshima 2014-12-07 02:13:45 +09:00
parent 8301b1e97e
commit b86a32323e
1 changed files with 116 additions and 63 deletions
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179
6502.S
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@ -358,6 +358,10 @@
adds PC, PC, #1
.endm
.macro _inc
// TODO
.endm
.macro _jmp
mov PC, r0
.endm
@ -451,6 +455,10 @@
mov PC, r0
.endm
.macro _sbc
// TODO
.endm
.macro _t a b
mov r0, \a
mov \a, \b
@ -589,6 +597,20 @@ opda:
opdb:
opdc:
opdf:
ope2:
ope3:
ope7:
opea:
opeb:
opef:
opf2:
opf3:
opf4:
opf7:
opfa:
opfb:
opfc:
opff:
_nop
_decode
@ -1231,7 +1253,7 @@ opc6: // DEC - Zero Page
opc8: // INY
_fromReg RY
_dec
_inc
_toReg RY
_decode
@ -1306,71 +1328,102 @@ opde: // DEC - Absolute, X
_toAddr
_decode
ope0:
b quit
ope1:
b quit
ope2:
b quit
ope3:
b quit
ope4:
b quit
ope5:
b quit
ope6:
b quit
ope7:
b quit
ope8:
b quit
ope9:
b quit
opea:
b quit
opeb:
b quit
opec:
b quit
oped:
b quit
opee:
b quit
opef:
b quit
opf0:
b quit
opf1:
b quit
opf2:
b quit
opf3:
b quit
opf4:
b quit
opf5:
b quit
opf6:
b quit
opf7:
b quit
ope0: // CPX - Immediate
_fromImmb
_cp RX
_decode
ope1: // SBC - (Indirect, X)
_fromIndexedIndirect
_sbc
_decode
ope4: // CPX - Zero Page
_fromZero
_cp RX
_decode
ope5: // SBC - Zero Page
_fromZero
_sbc
_decode
ope6: // INC - Zero Page
_fromZero
_inc
_toAddr
_decode
ope8: // INX
_fromReg RX
_inc
_toAddr
_decode
ope9: // SBC - Immediate
_fromImmb
_sbc
_decode
opec: // CPX - Absolute
_fromAbsb
_cp RX
_decode
oped: // SBC - Absolute
_fromAbsb
_sbc
_decode
opee: // INC - Absolute
_fromAbsb
_inc
_toAddr
_decode
opf0: // BEQ (Z==1)
movs r0, #FLAG_Z
tst SR, r0
beq 1f
_bxx
1:
_decode
opf1: // SBC - (Indirect), Y
_fromIndirectIndex
_sbc
_decode
opf5: // SBC - Zero Page, X
_fromZeroIndex RX
_sbc
_decode
opf6: // INC - Zero Page, X
_fromZeroIndex RX
_inc
_toAddr
_decode
opf8: // SED
_sex FLAG_D
_decode
opf9:
b quit
opfa:
b quit
opfb:
b quit
opfc:
b quit
opfd:
b quit
opfe:
b quit
opff:
b quit
opf9: // SBC - Absolute, Y
_fromAbsoluteIndexed RY
_sbc
_decode
opfd: // SBC - Absolute, X
_fromAbsoluteIndexed RX
_sbc
_decode
opfe: // INC - Absolute, X
_fromAbsoluteIndexed RX
_inc
_toAddr
_decode
.global cpu6502_reset
.type cpu6502_reset, %function