mirror of
https://github.com/ksherlock/wdc-utils.git
synced 2024-12-13 10:29:09 +00:00
497 lines
16 KiB
C++
497 lines
16 KiB
C++
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#include "disassembler.h"
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#include <stdio.h>
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static constexpr const char opcodes[] =
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"brkoracoporatsboraaslora"
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"phporaaslphdtsboraaslora"
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"bploraoraoratrboraaslora"
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"clcorainctcstrboraaslora"
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"jsrandjslandbitandroland"
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"plpandrolpldbitandroland"
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"bmiandandandbitandroland"
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"secanddectscbitandroland"
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"rtieorwdmeormvpeorlsreor"
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"phaeorlsrphkjmpeorlsreor"
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"bvceoreoreormvneorlsreor"
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"clieorphytcdjmleorlsreor"
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"rtsadcperadcstzadcroradc"
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"plaadcrorrtljmpadcroradc"
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"bvsadcadcadcstzadcroradc"
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"seiadcplytdcjmpadcroradc"
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"brastabrlstastystastxsta"
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"deybittxaphbstystastxsta"
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"bccstastastastystastxsta"
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"tyastatxstxystzstastzsta"
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"ldyldaldxldaldyldaldxlda"
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"tayldataxplbldyldaldxlda"
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"bcsldaldaldaldyldaldxlda"
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"clvldatsxtyxldyldaldxlda"
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"cpycmprepcmpcpycmpdeccmp"
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"inycmpdexwaicpycmpdeccmp"
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"bnecmpcmpcmppeicmpdeccmp"
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"cldcmpphxstpjmlcmpdeccmp"
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"cpxsbcsepsbccpxsbcincsbc"
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"inxsbcnopxbacpxsbcincsbc"
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"beqsbcsbcsbcpeasbcincsbc"
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"sedsbcplxxcejsrsbcincsbc"
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;
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static constexpr const int mImplied = 0x0000;
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static constexpr const int mImmediate = 0x1000;
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static constexpr const int mAbsolute = 0x2000;
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static constexpr const int mAbsoluteI = 0x3000;
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static constexpr const int mAbsoluteIL = 0x4000;
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static constexpr const int mAbsoluteLong = 0x5000;
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static constexpr const int mDP = 0x6000;
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static constexpr const int mDPI = 0x7000;
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static constexpr const int mDPIL = 0x8000;
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static constexpr const int mRelative = 0x9000;
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static constexpr const int mBlockMove = 0xa000;
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static constexpr const int m_S = 0x0100;
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static constexpr const int m_X = 0x0200;
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static constexpr const int m_Y = 0x0400;
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static constexpr const int m_M = 0x0020;
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static constexpr const int m_I = 0x0010;
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static constexpr const int modes[] =
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{
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1 | mAbsolute, // 00 brk #imm
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1 | mDPI | m_X, // 01 ora (dp,x)
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1 | mAbsolute, // 02 cop #imm
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1 | mDP | m_S, // 03 ora ,s
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1 | mDP, // 04 tsb <dp
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1 | mDP, // 05 ora <dp
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1 | mDP, // 06 asl <dp
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1 | mDPIL, // 07 ora [dp]
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0 | mImplied, // 08 php
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1 | mImmediate | m_M, // 09 ora #imm
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0 | mImplied, // 0a asl a
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0 | mImplied, // 0b phd
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2 | mAbsolute, // 0c tsb |abs
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2 | mAbsolute, // 0d ora |abs
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2 | mAbsolute, // 0e asl |abs
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3 | mAbsoluteLong, // 0f ora >abs
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1 | mRelative, // 10 bpl
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1 | mDPI | m_Y, // 11 ora (dp),y
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1 | mDPI, // 12 ora (dp)
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1 | mDPI | m_S | m_Y, // 13 ora ,s,y
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1 | mDP, // 14 trb <dp
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1 | mDP | m_X, // 15 ora <dp,x
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1 | mDP | m_X, // 16 asl <dp,x
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1 | mDPIL | m_Y, // 17 ora [dp],y
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0 | mImplied, // 18 clc
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2 | mAbsolute | m_Y, // 19 ora |abs,y
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0 | mImplied, // 1a inc a
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0 | mImplied, // 1b tcs
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2 | mAbsolute, // 1c trb |abs
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2 | mAbsolute | m_X, // 1d ora |abs,x
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2 | mAbsolute | m_X, // 1e asl |abs,x
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3 | mAbsoluteLong | m_X, // 1f ora >abs,x
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2 | mAbsolute, // 20 jsr |abs
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1 | mDPI | m_X, // 21 and (dp,x)
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3 | mAbsoluteLong, // 22 jsl >abs
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1 | mDP | m_S, // 23 and ,s
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1 | mDP, // 24 bit <dp
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1 | mDP, // 25 and <dp
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1 | mDP, // 26 rol <dp
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1 | mDPIL, // 27 and [dp]
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0 | mImplied, // 28 plp
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1 | mImmediate | m_M, // 29 and #imm
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0 | mImplied, // 2a rol a
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0 | mImplied, // 2b pld
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2 | mAbsolute, // 2c bit |abs
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2 | mAbsolute, // 2d and |abs
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2 | mAbsolute, // 2e rol |abs
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3 | mAbsoluteLong, // 2f and >abs
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1 | mRelative, // 30 bmi
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1 | mDPI | m_Y, // 31 and (dp),y
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1 | mDPI, // 32 and (dp)
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1 | mDPI | m_S | m_Y, // 33 and ,s,y
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1 | mDP | m_X, // 34 bit dp,x
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1 | mDP | m_X, // 35 and dp,x
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1 | mDP | m_X, // 36 rol <dp,x
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1 | mDPIL | m_Y, // 37 and [dp],y
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0 | mImplied, // 38 sec
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2 | mAbsolute | m_Y, // 39 and |abs,y
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0 | mImplied, // 3a dec a
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0 | mImplied, // 3b tsc
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2 | mAbsolute | m_X, // 3c bits |abs,x
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2 | mAbsolute | m_X, // 3d and |abs,x
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2 | mAbsolute | m_X, // 3e rol |abs,x
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3 | mAbsoluteLong | m_X, // 3f and >abs,x
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0 | mImplied, // 40 rti
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1 | mDPI | m_X, // 41 eor (dp,x)
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1 | mAbsolute, // 42 wdm #imm
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1 | mDP | m_S, // 43 eor ,s
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2 | mBlockMove, // 44 mvp x,x
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1 | mDP, // 45 eor dp
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1 | mDP, // 46 lsr dp
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1 | mDPIL | m_Y, // 47 eor [dp],y
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0 | mImplied, // 48 pha
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1 | mImmediate | m_M, // 49 eor #imm
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0 | mImplied, // 4a lsr a
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0 | mImplied, // 4b phk
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2 | mAbsolute, // 4c jmp |abs
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2 | mAbsolute, // 4d eor |abs
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2 | mAbsolute, // 4e lsr |abs
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3 | mAbsoluteLong, // 4f eor >abs
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1 | mRelative, // 50 bvc
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1 | mDPI | m_Y, // 51 eor (dp),y
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1 | mDPI, // 52 eor (dp)
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1 | mDPI | m_S | m_Y, // 53 eor ,s,y
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2 | mBlockMove, // 54 mvn x,x
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1 | mDP | m_X, // 55 eor dp,x
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1 | mDP | m_X, // 56 lsr dp,x
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1 | mDPIL | m_Y, // 57 eor [dp],y
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0 | mImplied, // 58 cli
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2 | mAbsolute | m_Y, // 59 eor |abs,y
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0 | mImplied, // 5a phy
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0 | mImplied, // 5b tcd
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3 | mAbsoluteLong, // 5c jml >abs
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2 | mAbsolute | m_X, // 5d eor |abs,x
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2 | mAbsolute | m_X, // 5e lsr |abs,x
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3 | mAbsoluteLong | m_X, // 5f eor >abs,x
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0 | mImplied, // 60 rts
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1 | mDPI | m_X, // 61 adc (dp,x)
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2 | mRelative, // 62 per |abs
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1 | mDP | m_S, // 63 adc ,s
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1 | mDP, // 64 stz <dp
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1 | mDP, // 65 adc <dp
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1 | mDP, // 66 ror <dp
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1 | mDPIL, // 67 adc [dp]
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0 | mImplied, // 68 pla
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1 | mImmediate | m_M, // 69 adc #imm
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0 | mImplied, // 6a ror a
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0 | mImplied, // 6b rtl
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2 | mAbsoluteI, // 6c jmp (abs)
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2 | mAbsolute, // 6d adc |abs
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2 | mAbsolute, // 6e ror |abs
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3 | mAbsoluteLong, // 6f adc >abs
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1 | mRelative, // 70 bvs
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1 | mDPI | m_Y, // 71 adc (dp),y
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1 | mDPI, // 72 adc (dp)
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1 | mDPI | m_S | m_Y, // 73 adc ,s,y
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1 | mDP | m_X, // 74 stz dp,x
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1 | mDP | m_X, // 75 adc dp,x
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1 | mDP | m_X, // 76 ror dp,x
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1 | mDPIL | m_Y, // 77 adc [dp],y
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0 | mImplied, // 78 sei
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2 | mAbsolute | m_Y, // 79 adc |abs,y
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0 | mImplied, // 7a ply
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0 | mImplied, // 7b tdc
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2 | mAbsoluteI | m_X, // 7c jmp (abs,x)
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2 | mAbsolute | m_X, // 7d adc |abs,x
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2 | mAbsolute | m_X, // 7e ror |abs,x
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3 | mAbsoluteLong | m_X, // 7f adc >abs,x
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1 | mRelative, // 80 bra
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1 | mDPI | m_X, // 81 sta (dp,x)
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2 | mRelative, // 82 brl |abs
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1 | mDP | m_S, // 83 sta ,s
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1 | mDP, // 84 sty <dp
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1 | mDP, // 85 sta <dp
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1 | mDP, // 86 stx <dp
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1 | mDPIL, // 87 sta [dp]
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0 | mImplied, // 88 dey
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1 | mImmediate | m_M, // 89 bit #imm
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0 | mImplied, // 8a txa
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0 | mImplied, // 8b phb
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2 | mAbsolute, // 8c sty |abs
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2 | mAbsolute, // 8d sta |abs
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2 | mAbsolute, // 8e stx |abs
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3 | mAbsoluteLong, // 8f sta >abs
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1 | mRelative, // 90 bcc
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1 | mDPI | m_Y, // 91 sta (dp),y
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1 | mDPI, // 92 sta (dp)
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1 | mDPI | m_S | m_Y, // 93 sta ,s,y
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1 | mDP | m_X, // 94 sty dp,x
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1 | mDP | m_X, // 95 sta dp,x
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1 | mDP | m_Y, // 96 stx dp,y
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1 | mDPIL | m_Y, // 97 sta [dp],y
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0 | mImplied, // 98 tya
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2 | mAbsolute | m_Y, // 99 sta |abs,y
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0 | mImplied, // 9a txs
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0 | mImplied, // 9b txy
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2 | mAbsolute, // 9c stz |abs
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2 | mAbsolute | m_X, // 9d sta |abs,x
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2 | mAbsolute | m_X, // 9e stz |abs,x
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3 | mAbsoluteLong | m_X, // 9f sta >abs,x
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1 | mImmediate | m_I, // a0 ldy #imm
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1 | mDPI | m_X, // a1 lda (dp,x)
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1 | mImmediate | m_I, // a2 ldx #imm
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1 | mDP | m_S, // a3 lda ,s
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1 | mDP, // a4 ldy <dp
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1 | mDP, // a5 lda <dp
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1 | mDP, // a6 ldx <dp
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1 | mDPIL, // a7 lda [dp]
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0 | mImplied, // a8 tay
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1 | mImmediate | m_M, // a9 lda #imm
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0 | mImplied, // aa tax
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0 | mImplied, // ab plb
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2 | mAbsolute, // ac ldy |abs
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2 | mAbsolute, // ad lda |abs
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2 | mAbsolute, // ae ldx |abs
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3 | mAbsoluteLong, // af lda >abs
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1 | mRelative, // b0 bcs
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1 | mDPI | m_Y, // b1 lda (dp),y
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1 | mDPI, // b2 lda (dp)
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1 | mDPI | m_S | m_Y, // b3 lda ,s,y
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1 | mDP | m_X, // b4 ldy <dp,x
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1 | mDP | m_X, // b5 lda <dp,x
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1 | mDP | m_Y, // b6 ldx <dp,y
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1 | mDPIL | m_Y, // b7 lda [dp],y
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0 | mImplied, // b8 clv
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2 | mAbsolute | m_Y, // b9 lda |abs,y
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0 | mImplied, // ba tsx
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0 | mImplied, // bb tyx
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2 | mAbsolute | m_X, // bc ldy |abs,x
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2 | mAbsolute | m_X, // bd lda |abs,x
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2 | mAbsolute | m_Y, // be ldx |abs,y
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3 | mAbsoluteLong | m_X, // bf lda >abs,x
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1 | mImmediate | m_I, // c0 cpy #imm
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1 | mDPI | m_X, // c1 cmp (dp,x)
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1 | mImmediate, // c2 rep #
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1 | mDP | m_S, // c3 cmp ,s
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1 | mDP, // c4 cpy <dp
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1 | mDP, // c5 cmp <dp
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1 | mDP, // c6 dec <dp
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1 | mDPIL, // c7 cmp [dp]
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0 | mImplied, // c8 iny
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1 | mImmediate | m_M, // c9 cmp #imm
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0 | mImplied, // ca dex
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0 | mImplied, // cb WAI
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2 | mAbsolute, // cc cpy |abs
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2 | mAbsolute, // cd cmp |abs
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2 | mAbsolute, // ce dec |abs
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3 | mAbsoluteLong, // cf cmp >abs
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1 | mRelative, // d0 bne
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1 | mDPI | m_Y, // d1 cmp (dp),y
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1 | mDPI, // d2 cmp (dp)
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1 | mDPI | m_S | m_Y, // d3 cmp ,s,y
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1 | mDPI, // d4 pei (dp)
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1 | mDP | m_X, // d5 cmp dp,x
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1 | mDP | m_X, // d6 dec dp,x
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1 | mDPIL | m_Y, // d7 cmp [dp],y
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0 | mImplied, // d8 cld
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2 | mAbsolute | m_Y, // d9 cmp |abs,y
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0 | mImplied, // da phx
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0 | mImplied, // db stp
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2 | mAbsoluteIL, // dc jml [abs]
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2 | mAbsolute | m_X, // dd cmp |abs,x
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2 | mAbsolute | m_X, // de dec |abs,x
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3 | mAbsoluteLong | m_X, // df cmp >abs,x
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1 | mImmediate | m_I, // e0 cpx #imm
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1 | mDPI | m_X, // e1 sbc (dp,x)
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1 | mImmediate, // e2 sep #imm
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1 | mDP | m_S, // e3 sbc ,s
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1 | mDP, // e4 cpx <dp
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1 | mDP, // e5 sbc <dp
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1 | mDP, // e6 inc <dp
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1 | mDPIL, // e7 sbc [dp]
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0 | mImplied, // e8 inx
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1 | mImmediate| m_M, // e9 sbc #imm
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0 | mImplied, // ea nop
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0 | mImplied, // eb xba
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2 | mAbsolute, // ec cpx |abs
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2 | mAbsolute, // ed abc |abs
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2 | mAbsolute, // ee inc |abs
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3 | mAbsoluteLong, // ef sbc >abs
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1 | mRelative, // f0 beq
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1 | mDPI | m_Y, // f1 sbc (dp),y
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1 | mDPI, // f2 sbc (dp)
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1 | mDPI | m_S | m_Y, // f3 sbc ,s,y
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2 | mAbsolute, // f4 pea |abs
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1 | mDP | m_X, // f5 sbc dp,x
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1 | mDP | m_X, // f6 inc dp,x
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1 | mDPIL | m_Y, // f7 sbc [dp],y
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0 | mImplied, // f8 sed
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2 | mAbsolute | m_Y, // f9 sbc |abs,y
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0 | mImplied, // fa plx
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0 | mImplied, // fb xce
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2 | mAbsoluteI, // fc jsr (abs)
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2 | mAbsolute | m_X, // fd sbc |abs,x
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2 | mAbsolute | m_X, // fe inc |abs,x
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3 | mAbsoluteLong | m_X, // ff sbc >abs,x
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};
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void disassembler::reset() {
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_arg = 0;
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_st = 0;
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}
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void disassembler::dump() {
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printf("\tbyte\t");
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for (unsigned i = 0; i < _st; ++i) {
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if (i > 0) printf(", ");
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printf("$%02x", _bytes[i]);
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}
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printf("\n");
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_pc += _st;
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reset();
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}
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void disassembler::dump(const std::string &expr, unsigned size) {
|
||
|
if (_st) dump();
|
||
|
|
||
|
switch(size) {
|
||
|
case 1: printf("\tbyte\t"); break;
|
||
|
case 2: printf("\tword\t"); break;
|
||
|
case 3: printf("\tda\t"); break;
|
||
|
case 4: printf("\tlong\t"); break;
|
||
|
default: printf("\t%d bytes\t", size);
|
||
|
}
|
||
|
printf("%s\n", expr.c_str());
|
||
|
_pc += _size;
|
||
|
reset();
|
||
|
}
|
||
|
|
||
|
void disassembler::process(const std::string &expr, unsigned size) {
|
||
|
if (_st != 1 || size != _size) {
|
||
|
dump(expr, size);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
print(expr);
|
||
|
}
|
||
|
|
||
|
void disassembler::flush() {
|
||
|
if (_st) dump();
|
||
|
}
|
||
|
|
||
|
void disassembler::process(uint8_t byte) {
|
||
|
_bytes[_st++] = byte;
|
||
|
if (_st == 1) {
|
||
|
_op = byte;
|
||
|
_mode = modes[_op];
|
||
|
_size = _mode & 0x0f;
|
||
|
if (_mode & _flags & m_I) _size++;
|
||
|
if (_mode & _flags & m_M) _size++;
|
||
|
|
||
|
if (!_size) {
|
||
|
print();
|
||
|
}
|
||
|
return;
|
||
|
}
|
||
|
unsigned shift = (_st - 2) * 8;
|
||
|
_arg = _arg + (byte << shift);
|
||
|
if (_st <= _size) return;
|
||
|
|
||
|
switch(_op) {
|
||
|
case 0xc2: // REP
|
||
|
_flags |= (_arg & 0x30);
|
||
|
break;
|
||
|
break;
|
||
|
case 0xe2: // SEP
|
||
|
_flags &= ~(_arg & 0x30);
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
// all done... now print it.
|
||
|
print();
|
||
|
}
|
||
|
|
||
|
void disassembler::print_prefix() {
|
||
|
|
||
|
switch(_mode & 0xf000) {
|
||
|
case mImmediate: printf("\t#"); break;
|
||
|
case mDP: printf("\t<"); break;
|
||
|
case mDPI: printf("\t(<"); break;
|
||
|
case mDPIL: printf("\t[<"); break;
|
||
|
|
||
|
case mRelative:
|
||
|
case mBlockMove:
|
||
|
printf("\t"); break;
|
||
|
|
||
|
// cop, brk are treated as absolute.
|
||
|
case mAbsolute:
|
||
|
if (_size == 1) printf("\t");
|
||
|
else printf("\t|");
|
||
|
break;
|
||
|
case mAbsoluteLong: printf("\t>"); break;
|
||
|
case mAbsoluteI: printf("\t("); break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void disassembler::print_suffix() {
|
||
|
|
||
|
switch(_mode & 0x0f00) {
|
||
|
case m_X: printf(",x"); break;
|
||
|
case m_Y: if (!(_mode & (mDPI|mDPIL))) printf(",y"); break;
|
||
|
case m_S:
|
||
|
case m_S | m_Y:
|
||
|
printf(",s"); break;
|
||
|
}
|
||
|
|
||
|
switch(_mode & 0xf000) {
|
||
|
case mAbsoluteI:
|
||
|
case mDPI:
|
||
|
printf(")"); break;
|
||
|
case mAbsoluteIL:
|
||
|
case mDPIL:
|
||
|
printf("]"); break;
|
||
|
}
|
||
|
|
||
|
// (xxx,s),y
|
||
|
// (xxx),y
|
||
|
// [xxx],y
|
||
|
switch(_mode & 0x0f00) {
|
||
|
case m_Y: if (_mode & (mDPI|mDPIL)) printf(",y"); break;
|
||
|
case m_S | m_Y:
|
||
|
printf(",y"); break;
|
||
|
}
|
||
|
|
||
|
}
|
||
|
|
||
|
void disassembler::print() {
|
||
|
printf("\t%.3s", &opcodes[_op * 3]);
|
||
|
|
||
|
print_prefix();
|
||
|
|
||
|
// todo -- relative, block mode.
|
||
|
switch (_size) {
|
||
|
case 0: break;
|
||
|
case 1: printf("$%02x", _arg); break;
|
||
|
case 2: printf("$%04x", _arg); break;
|
||
|
case 3: printf("$%06x", _arg); break;
|
||
|
}
|
||
|
|
||
|
print_suffix();
|
||
|
// also print bytes?
|
||
|
printf("\n");
|
||
|
_pc += _size + 1;
|
||
|
reset();
|
||
|
}
|
||
|
|
||
|
void disassembler::print(const std::string &expr) {
|
||
|
printf("\t%.3s", &opcodes[_op * 3]);
|
||
|
|
||
|
print_prefix();
|
||
|
|
||
|
// todo -- relative, block mode.
|
||
|
printf("%s", expr.c_str());
|
||
|
|
||
|
print_suffix();
|
||
|
// also print bytes?
|
||
|
printf("\n");
|
||
|
_pc += _size + 1;
|
||
|
reset();
|
||
|
}
|