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Implement op -0x2f

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This commit is contained in:
Takashi Toyoshima 2014-12-06 22:45:05 +09:00
parent 02560fdc4b
commit 124bfa1941
1 changed files with 161 additions and 63 deletions
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224
6502.S
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@ -76,8 +76,25 @@
mov SP, r0
.endm
.macro _popb
mov r0, SP
adds r0, r0, #1
mov SP, r0
_ldb
.endm
.macro _decode
b decode
bl dump
mov r0, PC
_ldb
lsls r1, r0, #2
ldr r2, 1f
adds r3, r2, r1
ldr r1, [r3]
mov pc, r1
.align 4
1:
.long op_table
.endm
.macro _fromAbsb
@ -181,16 +198,6 @@
orrs SR, SR, T0
.endm
.macro _clx flag
__cl \flag
adds PC, PC, #1
.endm
.macro _sex flag
__se \flag
adds PC, PC, #1
.endm
.macro _flag_nz
__cl (FLAG_N | FLAG_Z)
movs r0, r0
@ -204,17 +211,13 @@
1:
.endm
.macro _ld reg
mov \reg, r0
_flag_nz
.macro _clx flag
__cl \flag
adds PC, PC, #1
.endm
.macro _lop op
mov r1, RA
\op r0, r1, r0
mov RA, r0
_flag_nz
.macro _sex flag
__se \flag
adds PC, PC, #1
.endm
@ -237,8 +240,23 @@
adds PC, PC, #1
.endm
.macro _nop
adds PC, PC, #1
.macro _bit
__cl (FLAG_N | FLAG_Z | FLAG_V)
mov r1, RA
ands r0, r1, r0
bne 1f
__se FLAG_Z
1:
movs r1, #0x80
tst r0, r1
beq 1f
__se FLAG_N
1:
movs r1, #0x40
tst r0, r1
beq 1f
__se FLAG_V
1:
.endm
.macro _bxx
@ -247,6 +265,69 @@
add PC, PC, r0
.endm
.macro _ld reg
mov \reg, r0
_flag_nz
adds PC, PC, #1
.endm
.macro _lop op
mov r1, RA
\op r0, r1, r0
mov RA, r0
_flag_nz
adds PC, PC, #1
.endm
.macro _nop
adds PC, PC, #1
.endm
.macro _rol
movs r2, #FLAG_C
ands r2, SR, r2
__cl (FLAG_N | FLAG_Z | FLAG_C)
movs r1, #0x80
tst r0, r1
beq 1f
__se FLAG_C
1:
lsls r0, r0, #1
uxtb r0, r0
adds r0, r0, r2
bne 1f
__se FLAG_Z
1:
tst r0, r1
beq 1f
__se FLAG_N
1:
adds PC, PC, #1
.endm
.macro _ror
movs r2, #FLAG_C
ands r2, SR, r2
lsls r2, r2, #7
__cl (FLAG_N | FLAG_Z | FLAG_C)
movs r1, #0x01
tst r0, r1
beq 1f
__se FLAG_C
1:
lsrs r0, r0, #1
adds r0, r0, r2
bne 1f
__se FLAG_Z
1:
movs r1, #0x80
tst r0, r1
beq 1f
__se FLAG_N
1:
adds PC, PC, #1
.endm
.macro _resume
ldr r0, =#r_pc
ldr PC, [r0]
@ -302,6 +383,11 @@ op1a:
op1b:
op1c:
op1f:
op22:
op23:
op27:
op2b:
op2f:
_nop
_decode
@ -411,36 +497,60 @@ op20: // JSR
mov PC, r0
_decode
op21:
b quit
op22:
b quit
op23:
b quit
op24:
b quit
op25:
b quit
op26:
b quit
op27:
b quit
op28:
b quit
op29:
b quit
op2a:
b quit
op2b:
b quit
op2c:
b quit
op2d:
b quit
op2e:
b quit
op2f:
b quit
op21: // AND - (Indirect, X)
_fromIndexedIndirect
_lop ands
_decode
op24: // BIT - Zero Page
_fromZero
_bit
_decode
op25: // AND - Zero Page
_fromZero
_lop ands
_decode
op26: // ROR - Zero Page
_fromZero
_ror
_toAddr
_decode
op28: // PLP
_popb
mov SR, r0
adds PC, PC, #1
_decode
op29: // AND - Immediate
_fromImm8
_lop ands
_decode
op2a: // ROR - Accumulator
_fromReg RA
_ror
_toReg RA
_decode
op2c: // BIT - Absolute
_fromAbsb
_bit
_decode
op2d: // AND - Absolute
_fromAbsb
_lop ands
_decode
op2e: // ROL - Absolute
_fromAbsb
_rol
_toAddr
_decode
op30:
b quit
op31:
@ -952,18 +1062,6 @@ dump:
mov sp, r0
pop {pc}
// void decode();
.type decode, %function
decode:
bl dump
mov r0, PC
_ldb
lsls r1, r0, #2
ldr r2, =#op_table
adds r3, r2, r1
ldr r1, [r3]
mov pc, r1
.section .rodata
op_table:
.long op00