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Implement op -0x0f

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This commit is contained in:
Takashi Toyoshima 2014-12-06 21:22:12 +09:00
parent ef36502777
commit e12f4260f3
1 changed files with 53 additions and 15 deletions
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68
6502.S
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@ -17,6 +17,7 @@
#define RX r9
#define RY r10
#define SP r11
#define ADDR r12
#define FLAG_N (1 << 7)
#define FLAG_V (1 << 6)
@ -79,6 +80,14 @@
b decode
.endm
.macro _fromAbsb
adds PC, PC, #1
mov r0, PC
_ldw
mov ADDR, r0
_ldb
.endm
.macro _fromImm8
adds PC, PC, #1
mov r0, PC
@ -98,14 +107,30 @@
_ldb
lsls r0, r0, #8
adds r0, r0, T1
mov ADDR, r0
_ldb
.endm
.macro _fromReg reg
mov r0, \reg
.endm
.macro _fromZero
_fromImm8
mov ADDR, r0
_ldb
.endm
.macro _toAddr
mov r0, ADDR
mov r1, T0
_stb
.endm
.macro _toReg reg
mov \reg, T0
.endm
.macro _toZero
_fromImm8
mov r1, T0
@ -232,6 +257,9 @@ op02:
op03:
op04:
op07:
op0b:
op0c:
op0f:
_nop
_decode
@ -259,7 +287,7 @@ op05: // ORA - Zero Page
op06: // ASL - Zero Page
_fromZero
_asl
_toZero
_toAddr
_decode
op08: // PHP
@ -267,20 +295,29 @@ op08: // PHP
adds PC, PC, #1
_decode
op09:
b quit
op0a:
b quit
op0b:
b quit
op0c:
b quit
op0d:
b quit
op0e:
b quit
op0f:
b quit
op09: // ORA - Immediate
_fromImm8
_lop orrs
_decode
op0a: // ASL - Accumulator
_fromReg RA
_asl
_toReg RA
_decode
op0d: // ORA - Absolute
_fromAbsb
_lop orrs
_toAddr
_decode
op0e: // ASL - Absolute
_fromAbsb
_asl
_toAddr
_decode
op10:
b quit
op11:
@ -526,6 +563,7 @@ op84: // STY - Zero Page
mov T0, RY
_toZero
_decode
op85:
b quit
op86: