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Implement op -0x20

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This commit is contained in:
Takashi Toyoshima 2014-12-06 21:44:48 +09:00
parent e12f4260f3
commit 02560fdc4b
1 changed files with 84 additions and 31 deletions
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115
6502.S
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@ -88,6 +88,15 @@
_ldb
.endm
.macro _fromAbsoluteIndexed reg
adds PC, PC, #1
mov r0, PC
_ldw
add r0, r0, \reg
mov ADDR, r0
_ldb
.endm
.macro _fromImm8
adds PC, PC, #1
mov r0, PC
@ -111,6 +120,22 @@
_ldb
.endm
.macro _fromIndirectIndex
_fromImm8
mov T0, r0
_ldb
mov T1, r0
mov r0, T0
adds r0, r0, #1
uxtb r0, r0
_ldb
lsls r0, r0, #8
add r0, r0, T1
add r0, r0, RY
mov ADDR, r0
_ldb
.endm
.macro _fromReg reg
mov r0, \reg
.endm
@ -121,6 +146,15 @@
_ldb
.endm
.macro _fromZeroIndex reg
_fromImm8
add r0, r0, \reg
uxtb r0, r0
mov ADDR, r0
_ldb
.endm
.macro _toAddr
mov r0, ADDR
mov r1, T0
@ -260,6 +294,14 @@ op07:
op0b:
op0c:
op0f:
op12:
op13:
op14:
op17:
op1a:
op1b:
op1c:
op1f:
_nop
_decode
@ -309,7 +351,6 @@ op0a: // ASL - Accumulator
op0d: // ORA - Absolute
_fromAbsb
_lop orrs
_toAddr
_decode
op0e: // ASL - Absolute
@ -318,39 +359,50 @@ op0e: // ASL - Absolute
_toAddr
_decode
op10:
b quit
op11:
b quit
op12:
b quit
op13:
b quit
op14:
b quit
op15:
b quit
op16:
b quit
op17:
b quit
op10: // BPL (N==0)
movs r0, #FLAG_N
tst SR, r0
bne 1f
_bxx
1:
_decode
op11: // ORA - (Indirect), Y
_fromIndirectIndex
_lop orrs
_decode
op15: // ORA - Zero Page, X
_fromZeroIndex RX
_lop orrs
_decode
op16: // ASL - Zero Page, X
_fromZeroIndex RX
_asl
_toAddr
_decode
op18: // CLC
_clx FLAG_C
_decode
op19:
b quit
op1a:
b quit
op1b:
b quit
op1c:
b quit
op1d:
b quit
op1e:
b quit
op1f:
b quit
op19: // ORA - Absolute, Y
_fromAbsoluteIndexed RY
_lop orrs
_decode
op1d: // ORA - Absolute, X
_fromAbsoluteIndexed RX
_lop orrs
_decode
op1e: // ASL - Absolute, X
_fromAbsoluteIndexed RX
_asl
_toAddr
_decode
op20: // JSR
adds T0, PC, #2
_pushw T0
@ -358,6 +410,7 @@ op20: // JSR
_ldw
mov PC, r0
_decode
op21:
b quit
op22: