+++ /dev/null
-\r
-// This file is part of the Cyclone 68000 Emulator\r
-\r
-// Copyright (c) 2004,2011 FinalDave (emudave (at) gmail.com)\r
-// Copyright (c) 2005-2011 GraÅžvydas "notaz" Ignotas (notasas (at) gmail.com)\r
-\r
-// This code is licensed under the GNU General Public License version 2.0 and the MAME License.\r
-// You can choose the license that has the most advantages for you.\r
-\r
-// SVN repository can be found at http://code.google.com/p/cyclone68000/\r
-\r
-\r
-#include "app.h"\r
-\r
-// --------------------- Opcodes 0x0000+ ---------------------\r
-// Emit an Ori/And/Sub/Add/Eor/Cmp Immediate opcode, 0000ttt0 ssaaaaaa\r
-int OpArith(int op)\r
-{\r
- int type=0,size=0;\r
- int sea=0,tea=0;\r
- int use=0;\r
- const char *shiftstr="";\r
-\r
- // Get source and target EA\r
- type=(op>>9)&7; if (type==4 || type>=7) return 1;\r
- size=(op>>6)&3; if (size>=3) return 1;\r
- sea= 0x003c;\r
- tea=op&0x003f;\r
-\r
- // See if we can do this opcode:\r
- if (EaCanRead(tea,size)==0) return 1;\r
- if (EaCanWrite(tea)==0 || EaAn(tea)) return 1;\r
-\r
- use=OpBase(op,size);\r
- if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op, sea, tea); Cycles=4;\r
-\r
- // imm must be read first\r
- EaCalcReadNoSE(-1,10,sea,size,0);\r
- EaCalcReadNoSE((type!=6)?11:-1,0,tea,size,0x003f);\r
-\r
- if (size<2) shiftstr=(char *)(size?",asl #16":",asl #24");\r
- if (size<2) ot(" mov r10,r10,asl #%i\n",size?16:24);\r
-\r
- ot(";@ Do arithmetic:\n");\r
-\r
- if (type==0) ot(" orr r1,r10,r0%s\n",shiftstr);\r
- if (type==1) ot(" and r1,r10,r0%s\n",shiftstr);\r
- if (type==2||type==6)\r
- ot(" rsbs r1,r10,r0%s ;@ Defines NZCV\n",shiftstr);\r
- if (type==3) ot(" adds r1,r10,r0%s ;@ Defines NZCV\n",shiftstr);\r
- if (type==5) ot(" eor r1,r10,r0%s\n",shiftstr);\r
-\r
- if (type<2 || type==5) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n"); // 0,1,5\r
-\r
- if (type< 2) OpGetFlags(0,0); // Ori/And\r
- if (type==2) OpGetFlags(1,1); // Sub: Subtract/X-bit\r
- if (type==3) OpGetFlags(0,1); // Add: X-bit\r
- if (type==5) OpGetFlags(0,0); // Eor\r
- if (type==6) OpGetFlags(1,0); // Cmp: Subtract\r
- ot("\n");\r
-\r
- if (type!=6)\r
- {\r
- EaWrite(11, 1, tea,size,0x003f,1);\r
- }\r
-\r
- // Correct cycles:\r
- if (type==6)\r
- {\r
- if (size>=2 && tea<0x10) Cycles+=2;\r
- }\r
- else\r
- {\r
- if (size>=2) Cycles+=4;\r
- if (tea>=8) Cycles+=4;\r
- if (type==1 && size>=2 && tea<8) Cycles-=2;\r
- }\r
-\r
- OpEnd(sea,tea);\r
-\r
- return 0;\r
-}\r
-\r
-// --------------------- Opcodes 0x5000+ ---------------------\r
-int OpAddq(int op)\r
-{\r
- // 0101nnnt xxeeeeee (nnn=#8,1-7 t=addq/subq xx=size, eeeeee=EA)\r
- int num=0,type=0,size=0,ea=0;\r
- int use=0;\r
- char count[16]="";\r
- int shift=0;\r
-\r
- num =(op>>9)&7; if (num==0) num=8;\r
- type=(op>>8)&1;\r
- size=(op>>6)&3; if (size>=3) return 1;\r
- ea = op&0x3f;\r
-\r
- // See if we can do this opcode:\r
- if (EaCanRead (ea,size)==0) return 1;\r
- if (EaCanWrite(ea) ==0) return 1;\r
- if (size == 0 && EaAn(ea) ) return 1;\r
-\r
- use=OpBase(op,size,1);\r
-\r
- if (num!=8) use|=0x0e00; // If num is not 8, use same handler\r
- if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op,ea);\r
- Cycles=ea<8?4:8;\r
- if(type==0&&size==1) Cycles=ea<0x10?4:8;\r
- if(size>=2) Cycles=ea<0x10?8:12;\r
-\r
- if (size>0 && (ea&0x38)==0x08) size=2; // addq.w #n,An is also 32-bit\r
-\r
- EaCalcReadNoSE(11,0,ea,size,0x003f);\r
-\r
- shift=32-(8<<size);\r
-\r
- if (num!=8)\r
- {\r
- int lsr=9-shift;\r
-\r
- ot(" and r2,r8,#0x0e00 ;@ Get quick value\n");\r
-\r
- if (lsr>=0) sprintf(count,"r2,lsr #%d", lsr);\r
- else sprintf(count,"r2,lsl #%d", -lsr);\r
-\r
- ot("\n");\r
- }\r
- else\r
- {\r
- sprintf(count,"#0x%.4x",8<<shift);\r
- }\r
-\r
- if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);\r
-\r
- if (type==0) ot(" adds r1,r0,%s\n",count);\r
- if (type==1) ot(" subs r1,r0,%s\n",count);\r
-\r
- if ((ea&0x38)!=0x08) OpGetFlags(type,1);\r
- ot("\n");\r
-\r
- EaWrite(11, 1, ea,size,0x003f,1);\r
-\r
- OpEnd(ea);\r
-\r
- return 0;\r
-}\r
-\r
-// --------------------- Opcodes 0x8000+ ---------------------\r
-// 1t0tnnnd xxeeeeee (tt=type:or/sub/and/add xx=size, eeeeee=EA)\r
-int OpArithReg(int op)\r
-{\r
- int use=0;\r
- int type=0,size=0,dir=0,rea=0,ea=0;\r
- const char *asl="";\r
- const char *strop=0;\r
-\r
- type=(op>>12)&5;\r
- rea =(op>> 9)&7;\r
- dir =(op>> 8)&1; // er,re\r
- size=(op>> 6)&3; if (size>=3) return 1;\r
- ea = op&0x3f;\r
-\r
- if (dir && ea<0x10) return 1; // addx/subx opcode\r
-\r
- // See if we can do this opcode:\r
- if (dir==0 && EaCanRead (ea,size)==0) return 1;\r
- if (dir && EaCanWrite(ea)==0) return 1;\r
- if ((size==0||!(type&1))&&EaAn(ea)) return 1;\r
-\r
- use=OpBase(op,size);\r
- use&=~0x0e00; // Use same opcode for Dn\r
- if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op,ea); Cycles=4;\r
-\r
- EaCalcReadNoSE(dir?11:-1,0,ea,size,0x003f);\r
-\r
- EaCalcReadNoSE(dir?-1:11,1,rea,size,0x0e00);\r
-\r
- ot(";@ Do arithmetic:\n");\r
- if (type==0) strop = "orr";\r
- if (type==1) strop = (char *) (dir ? "subs" : "rsbs");\r
- if (type==4) strop = "and";\r
- if (type==5) strop = "adds";\r
-\r
- if (size==0) asl=",asl #24";\r
- if (size==1) asl=",asl #16";\r
-\r
- if (size<2) ot(" mov r0,r0%s\n",asl);\r
- ot(" %s r1,r0,r1%s\n",strop,asl);\r
-\r
- if ((type&1)==0) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r
-\r
- OpGetFlags(type==1,type&1); // 1==subtract\r
- ot("\n");\r
-\r
- ot(";@ Save result:\n");\r
- if (size<2) ot(" mov r1,r1,asr #%d\n",size?16:24);\r
- if (dir) EaWrite(11, 1, ea,size,0x003f,0,0);\r
- else EaWrite(11, 1,rea,size,0x0e00,0,0);\r
-\r
- if(rea==ea) {\r
- if(ea<8) Cycles=(size>=2)?8:4; else Cycles+=(size>=2)?26:14;\r
- } else if(dir) {\r
- Cycles+=4;\r
- if(size>=2) Cycles+=4;\r
- } else {\r
- if(size>=2) {\r
- Cycles+=2;\r
- if(ea<0x10||ea==0x3c) Cycles+=2;\r
- }\r
- }\r
-\r
- OpEnd(ea);\r
-\r
- return 0;\r
-}\r
-\r
-// --------------------- Opcodes 0x80c0+ ---------------------\r
-int OpMul(int op)\r
-{\r
- // Div/Mul: 1m00nnns 11eeeeee (m=Mul, nnn=Register Dn, s=signed, eeeeee=EA)\r
- int type=0,rea=0,sign=0,ea=0;\r
- int use=0;\r
-\r
- type=(op>>14)&1; // div/mul\r
- rea =(op>> 9)&7;\r
- sign=(op>> 8)&1;\r
- ea = op&0x3f;\r
-\r
- // See if we can do this opcode:\r
- if (EaCanRead(ea,1)==0||EaAn(ea)) return 1;\r
-\r
- use=OpBase(op,1);\r
- use&=~0x0e00; // Use same for all registers\r
- if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op,ea);\r
- if(type) Cycles=54;\r
- else Cycles=sign?158:140;\r
-\r
- EaCalcReadNoSE(-1,0,ea,1,0x003f);\r
-\r
- EaCalc(11,0x0e00,rea, 2);\r
- EaRead(11, 2,rea, 2,0x0e00);\r
-\r
- ot(" movs r1,r0,asl #16\n");\r
-\r
- if (type==0) // div\r
- {\r
- // the manual says C is always cleared, but neither Musashi nor FAME do that\r
- //ot(" bic r10,r10,#0x20000000 ;@ always clear C\n");\r
- ot(" beq divzero%.4x ;@ division by zero\n",op);\r
- ot("\n");\r
- \r
- if (sign)\r
- {\r
- ot(" mov r12,#0 ;@ r12 = 1 or 2 if the result is negative\n");\r
- ot(" tst r2,r2\n");\r
- ot(" orrmi r12,r12,#2\n");\r
- ot(" rsbmi r2,r2,#0 ;@ Make r2 positive\n");\r
- ot("\n");\r
- ot(" movs r0,r1,asr #16\n");\r
- ot(" orrmi r12,r12,#1\n");\r
- ot(" rsbmi r0,r0,#0 ;@ Make r0 positive\n");\r
- ot("\n");\r
- ot(";@ detect the nasty 0x80000000 / -1 situation\n");\r
- ot(" mov r3,r2,asr #31\n");\r
- ot(" eors r3,r3,r1,asr #16\n");\r
- ot(" beq wrendofop%.4x\n",op);\r
- }\r
- else\r
- {\r
- ot(" mov r0,r1,lsr #16 ;@ use only 16 bits of divisor\n");\r
- }\r
-\r
- ot("\n");\r
- ot(";@ Divide r2 by r0\n");\r
- ot(" mov r3,#0\n");\r
- ot(" mov r1,r0\n");\r
- ot("\n");\r
- ot(";@ Shift up divisor till it's just less than numerator\n");\r
- ot("Shift%.4x%s\n",op,ms?"":":");\r
- ot(" cmp r1,r2,lsr #1\n");\r
- ot(" movls r1,r1,lsl #1\n");\r
- ot(" bcc Shift%.4x\n",op);\r
- ot("\n");\r
-\r
- ot("Divide%.4x%s\n",op,ms?"":":");\r
- ot(" cmp r2,r1\n");\r
- ot(" adc r3,r3,r3 ;@ Double r3 and add 1 if carry set\n");\r
- ot(" subcs r2,r2,r1\n");\r
- ot(" teq r1,r0\n");\r
- ot(" movne r1,r1,lsr #1\n");\r
- ot(" bne Divide%.4x\n",op);\r
- ot("\n");\r
- ot(";@r3==quotient,r2==remainder\n");\r
-\r
- if (sign)\r
- {\r
- // sign correction\r
- ot(" and r1,r12,#1\n");\r
- ot(" teq r1,r12,lsr #1\n");\r
- ot(" rsbne r3,r3,#0 ;@ negate if quotient is negative\n");\r
- ot(" tst r12,#2\n");\r
- ot(" rsbne r2,r2,#0 ;@ negate the remainder if divident was negative\n");\r
- ot("\n");\r
-\r
- // signed overflow check\r
- ot(" mov r1,r3,asl #16\n");\r
- ot(" cmp r3,r1,asr #16 ;@ signed overflow?\n");\r
- ot(" orrne r10,r10,#0x10000000 ;@ set overflow flag\n");\r
- ot(" bne endofop%.4x ;@ overflow!\n",op);\r
- ot("\n");\r
- ot("wrendofop%.4x%s\n",op,ms?"":":");\r
- }\r
- else\r
- {\r
- // overflow check\r
- ot(" movs r1,r3,lsr #16 ;@ check for overflow condition\n");\r
- ot(" orrne r10,r10,#0x10000000 ;@ set overflow flag\n");\r
- ot(" bne endofop%.4x ;@ overflow!\n",op);\r
- ot("\n");\r
- }\r
-\r
- ot(" mov r1,r3,lsl #16 ;@ Clip to 16-bits\n");\r
- ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r
- OpGetFlags(0,0);\r
-\r
- ot(" mov r1,r1,lsr #16\n");\r
- ot(" orr r1,r1,r2,lsl #16 ;@ Insert remainder\n");\r
- }\r
-\r
- if (type==1)\r
- {\r
- ot(";@ Get 16-bit signs right:\n");\r
- ot(" mov r0,r1,%s #16\n",sign?"asr":"lsr");\r
- ot(" mov r2,r2,lsl #16\n");\r
- ot(" mov r2,r2,%s #16\n",sign?"asr":"lsr");\r
- ot("\n");\r
-\r
- ot(" mul r1,r2,r0\n");\r
- ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r
- OpGetFlags(0,0);\r
- }\r
- ot("\n");\r
-\r
- EaWrite(11, 1,rea, 2,0x0e00,1);\r
-\r
- if (type==0) ot("endofop%.4x%s\n",op,ms?"":":");\r
- OpEnd(ea);\r
-\r
- if (type==0) // div\r
- {\r
- ot("divzero%.4x%s\n",op,ms?"":":");\r
- ot(" mov r0,#5 ;@ Divide by zero\n");\r
- ot(" bl Exception\n");\r
- Cycles+=38;\r
- OpEnd(ea);\r
- ot("\n");\r
- }\r
-\r
- return 0;\r
-}\r
-\r
-// Get X Bit into carry - trashes r2\r
-int GetXBit(int subtract)\r
-{\r
- ot(";@ Get X bit:\n");\r
- ot(" ldr r2,[r7,#0x4c]\n");\r
- if (subtract) ot(" mvn r2,r2 ;@ Invert it\n");\r
- ot(" msr cpsr_flg,r2 ;@ Get into Carry\n");\r
- ot("\n");\r
- return 0;\r
-}\r
-\r
-// --------------------- Opcodes 0x8100+ ---------------------\r
-// 1t00ddd1 0000asss - sbcd/abcd Ds,Dd or -(As),-(Ad)\r
-int OpAbcd(int op)\r
-{\r
- int use=0;\r
- int type=0,sea=0,mem=0,dea=0;\r
- \r
- type=(op>>14)&1; // sbcd/abcd\r
- dea =(op>> 9)&7;\r
- mem =(op>> 3)&1;\r
- sea = op &7;\r
-\r
- if (mem) { sea|=0x20; dea|=0x20; }\r
-\r
- use=op&~0x0e07; // Use same opcode for all registers..\r
- if (sea==0x27) use|=0x0007; // ___x.b -(a7)\r
- if (dea==0x27) use|=0x0e00; // ___x.b -(a7)\r
- if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op,sea,dea); Cycles=6;\r
-\r
- if (mem)\r
- {\r
- ot(";@ Get src/dest EA vals\n");\r
- EaCalc (0,0x000f, sea,0,1);\r
- EaRead (0, 6, sea,0,0x000f,1);\r
- EaCalcReadNoSE(11,0,dea,0,0x0e00);\r
- }\r
- else\r
- {\r
- ot(";@ Get src/dest reg vals\n");\r
- EaCalcReadNoSE(-1,6,sea,0,0x0007);\r
- EaCalcReadNoSE(11,0,dea,0,0x0e00);\r
- ot(" mov r6,r6,asl #24\n");\r
- }\r
- ot(" mov r1,r0,asl #24\n\n");\r
-\r
- ot(" bic r10,r10,#0xb1000000 ;@ clear all flags except old Z\n");\r
-\r
- if (type)\r
- {\r
- ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");\r
- ot(" mov r3,#0x00f00000\n");\r
- ot(" and r2,r3,r1,lsr #4\n");\r
- ot(" tst r0,#0x20000000\n");\r
- ot(" and r0,r3,r6,lsr #4\n");\r
- ot(" add r0,r0,r2\n");\r
- ot(" addne r0,r0,#0x00100000\n");\r
-// ot(" tst r0,#0x00800000\n");\r
-// ot(" orreq r10,r10,#0x01000000 ;@ Undefined V behavior\n");\r
- ot(" cmp r0,#0x00900000\n");\r
- ot(" addhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");\r
-\r
- ot(" mov r2,r1,lsr #28\n");\r
- ot(" add r0,r0,r2,lsl #24\n");\r
- ot(" mov r2,r6,lsr #28\n");\r
- ot(" add r0,r0,r2,lsl #24\n");\r
- ot(" cmp r0,#0x09900000\n");\r
- ot(" orrhi r10,r10,#0x20000000 ;@ C\n");\r
- ot(" subhi r0,r0,#0x0a000000\n");\r
-// ot(" and r3,r10,r0,lsr #3 ;@ Undefined V behavior part II\n");\r
-// ot(" orr r10,r10,r3,lsl #4 ;@ V\n");\r
- ot(" movs r0,r0,lsl #4\n");\r
- ot(" orrmi r10,r10,#0x90000000 ;@ Undefined N+V behavior\n"); // this is what Musashi really does\r
- ot(" bicne r10,r10,#0x40000000 ;@ Z flag\n");\r
- }\r
- else\r
- {\r
- ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");\r
- ot(" mov r3,#0x00f00000\n");\r
- ot(" and r2,r3,r6,lsr #4\n");\r
- ot(" tst r0,#0x20000000\n");\r
- ot(" and r0,r3,r1,lsr #4\n");\r
- ot(" sub r0,r0,r2\n");\r
- ot(" subne r0,r0,#0x00100000\n");\r
-// ot(" tst r0,#0x00800000\n");\r
-// ot(" orreq r10,r10,#0x01000000 ;@ Undefined V behavior\n");\r
- ot(" cmp r0,#0x00900000\n");\r
- ot(" subhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");\r
-\r
- ot(" mov r2,r1,lsr #28\n");\r
- ot(" add r0,r0,r2,lsl #24\n");\r
- ot(" mov r2,r6,lsr #28\n");\r
- ot(" sub r0,r0,r2,lsl #24\n");\r
- ot(" cmp r0,#0x09900000\n");\r
- ot(" orrhi r10,r10,#0xa0000000 ;@ N and C\n");\r
- ot(" addhi r0,r0,#0x0a000000\n");\r
-// ot(" and r3,r10,r0,lsr #3 ;@ Undefined V behavior part II\n");\r
-// ot(" orr r10,r10,r3,lsl #4 ;@ V\n");\r
- ot(" movs r0,r0,lsl #4\n");\r
-// ot(" orrmi r10,r10,#0x80000000 ;@ Undefined N behavior\n");\r
- ot(" bicne r10,r10,#0x40000000 ;@ Z flag\n");\r
- }\r
-\r
- ot(" str r10,[r7,#0x4c] ;@ Save X bit\n");\r
- ot("\n");\r
-\r
- EaWrite(11, 0, dea,0,0x0e00,1);\r
-\r
- ot(" ldr r6,[r7,#0x54]\n");\r
- OpEnd(sea,dea);\r
-\r
- return 0;\r
-}\r
-\r
-// 01001000 00eeeeee - nbcd <ea>\r
-int OpNbcd(int op)\r
-{\r
- int use=0;\r
- int ea=0;\r
- \r
- ea=op&0x3f;\r
-\r
- if(EaCanWrite(ea)==0||EaAn(ea)) return 1;\r
-\r
- use=OpBase(op,0);\r
- if(op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op,ea); Cycles=6;\r
- if(ea >= 8) Cycles+=2;\r
-\r
- EaCalcReadNoSE(6,0,ea,0,0x003f);\r
-\r
- // this is rewrite of Musashi's code\r
- ot(" ldr r2,[r7,#0x4c]\n");\r
- ot(" bic r10,r10,#0xb0000000 ;@ clear all flags, except Z\n");\r
- ot(" mov r0,r0,asl #24\n");\r
- ot(" and r2,r2,#0x20000000\n");\r
- ot(" add r2,r0,r2,lsr #5 ;@ add X\n");\r
- ot(" rsb r11,r2,#0x9a000000 ;@ do arithmetic\n");\r
-\r
- ot(" cmp r11,#0x9a000000\n");\r
- ot(" beq finish%.4x\n",op);\r
- ot("\n");\r
-\r
- ot(" mvn r3,r11,lsr #31 ;@ Undefined V behavior\n",op);\r
- ot(" and r2,r11,#0x0f000000\n");\r
- ot(" cmp r2,#0x0a000000\n");\r
- ot(" andeq r11,r11,#0xf0000000\n");\r
- ot(" addeq r11,r11,#0x10000000\n");\r
- ot(" and r3,r3,r11,lsr #31 ;@ Undefined V behavior part II\n",op);\r
- ot(" movs r1,r11,asr #24\n");\r
- ot(" bicne r10,r10,#0x40000000 ;@ Z\n");\r
- ot(" orr r10,r10,r3,lsl #28 ;@ save V\n",op);\r
- ot(" orr r10,r10,#0x20000000 ;@ C\n");\r
- ot("\n");\r
-\r
- EaWrite(6, 1, ea,0,0x3f,0,0);\r
-\r
- ot("finish%.4x%s\n",op,ms?"":":");\r
- ot(" tst r11,r11\n");\r
- ot(" orrmi r10,r10,#0x80000000 ;@ N\n");\r
- ot(" str r10,[r7,#0x4c] ;@ Save X\n");\r
- ot("\n");\r
-\r
- ot(" ldr r6,[r7,#0x54]\n");\r
- OpEnd(ea);\r
-\r
- return 0;\r
-}\r
-\r
-// --------------------- Opcodes 0x90c0+ ---------------------\r
-// Suba/Cmpa/Adda 1tt1nnnx 11eeeeee (tt=type, x=size, eeeeee=Source EA)\r
-int OpAritha(int op)\r
-{\r
- int use=0;\r
- int type=0,size=0,sea=0,dea=0;\r
- const char *asr="";\r
-\r
- // Suba/Cmpa/Adda/(invalid):\r
- type=(op>>13)&3; if (type>=3) return 1;\r
-\r
- size=(op>>8)&1; size++;\r
- dea=(op>>9)&7; dea|=8; // Dest=An\r
- sea=op&0x003f; // Source\r
-\r
- // See if we can do this opcode:\r
- if (EaCanRead(sea,size)==0) return 1;\r
-\r
- use=OpBase(op,size);\r
- use&=~0x0e00; // Use same opcode for An\r
- if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op,sea); Cycles=(size==2)?6:8;\r
- if(size==2&&(sea<0x10||sea==0x3c)) Cycles+=2;\r
- if(type==1) Cycles=6;\r
-\r
- // EA calculation order defines how situations like suba.w (A0)+, A0 get handled.\r
- // different emus act differently in this situation, I couldn't fugure which is right behaviour.\r
- //if (type == 1)\r
- {\r
- EaCalcReadNoSE(-1,0,sea,size,0x003f);\r
- EaCalcReadNoSE(type!=1?11:-1,1,dea,2,0x0e00);\r
- }\r
-#if 0\r
- else\r
- {\r
- EaCalcReadNoSE(type!=1?11:-1,1,dea,2,0x0e00);\r
- EaCalcReadNoSE(-1,0,sea,size,0x003f);\r
- }\r
-#endif\r
-\r
- if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);\r
- if (size<2) asr=(char *)(size?",asr #16":",asr #24");\r
-\r
- if (type==0) ot(" sub r1,r1,r0%s\n",asr);\r
- if (type==1) ot(" cmp r1,r0%s ;@ Defines NZCV\n",asr);\r
- if (type==1) OpGetFlags(1,0); // Get Cmp flags\r
- if (type==2) ot(" add r1,r1,r0%s\n",asr);\r
- ot("\n");\r
-\r
- if (type!=1) EaWrite(11, 1, dea,2,0x0e00);\r
-\r
- OpEnd(sea);\r
-\r
- return 0;\r
-}\r
-\r
-// --------------------- Opcodes 0x9100+ ---------------------\r
-// Emit a Subx/Addx opcode, 1t01ddd1 zz00rsss addx.z Ds,Dd\r
-int OpAddx(int op)\r
-{\r
- int use=0;\r
- int type=0,size=0,dea=0,sea=0,mem=0;\r
- const char *asl="";\r
-\r
- type=(op>>14)&1;\r
- dea =(op>> 9)&7;\r
- size=(op>> 6)&3; if (size>=3) return 1;\r
- sea = op&7;\r
- mem =(op>> 3)&1;\r
-\r
- // See if we can do this opcode:\r
- if (EaCanRead(sea,size)==0) return 1;\r
- if (EaCanWrite(dea)==0) return 1;\r
-\r
- if (mem) { sea+=0x20; dea+=0x20; }\r
-\r
- use=op&~0x0e07; // Use same opcode for Dn\r
- if (size==0&&sea==0x27) use|=0x0007; // ___x.b -(a7)\r
- if (size==0&&dea==0x27) use|=0x0e00; // ___x.b -(a7)\r
- if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op,sea,dea); Cycles=4;\r
- if(size>=2) Cycles+=4;\r
- if(sea>=0x10) Cycles+=2;\r
-\r
- if (mem)\r
- {\r
- ot(";@ Get src/dest EA vals\n");\r
- EaCalc (0,0x000f, sea,size,1);\r
- EaRead (0, 6, sea,size,0x000f,1);\r
- EaCalcReadNoSE(11,0,dea,size,0x0e00);\r
- }\r
- else\r
- {\r
- ot(";@ Get src/dest reg vals\n");\r
- EaCalcReadNoSE(-1,6,sea,size,0x0007);\r
- EaCalcReadNoSE(11,0,dea,size,0x0e00);\r
- if (size<2) ot(" mov r6,r6,asl #%d\n\n",size?16:24);\r
- }\r
-\r
- if (size<2) asl=(char *)(size?",asl #16":",asl #24");\r
-\r
- ot(";@ Do arithmetic:\n");\r
- GetXBit(type==0);\r
-\r
- if (type==1 && size<2)\r
- {\r
- ot(";@ Make sure the carry bit will tip the balance:\n");\r
- ot(" mvn r2,#0\n");\r
- ot(" orr r6,r6,r2,lsr #%i\n",(size==0)?8:16);\r
- ot("\n");\r
- }\r
-\r
- if (type==0) ot(" rscs r1,r6,r0%s\n",asl);\r
- if (type==1) ot(" adcs r1,r6,r0%s\n",asl);\r
- ot(" orr r3,r10,#0xb0000000 ;@ for old Z\n");\r
- OpGetFlags(type==0,1,0); // subtract\r
- if (size<2) {\r
- ot(" movs r2,r1,lsr #%i\n", size?16:24);\r
- ot(" orreq r10,r10,#0x40000000 ;@ add potentially missed Z\n");\r
- }\r
- ot(" andeq r10,r10,r3 ;@ fix Z\n");\r
- ot("\n");\r
-\r
- ot(";@ Save result:\n");\r
- EaWrite(11, 1, dea,size,0x0e00,1);\r
-\r
- ot(" ldr r6,[r7,#0x54]\n");\r
- OpEnd(sea,dea);\r
-\r
- return 0;\r
-}\r
-\r
-// --------------------- Opcodes 0xb000+ ---------------------\r
-// Emit a Cmp/Eor opcode, 1011rrrt xxeeeeee (rrr=Dn, t=cmp/eor, xx=size extension, eeeeee=ea)\r
-int OpCmpEor(int op)\r
-{\r
- int rea=0,eor=0;\r
- int size=0,ea=0,use=0;\r
- const char *asl="";\r
-\r
- // Get EA and register EA\r
- rea=(op>>9)&7;\r
- eor=(op>>8)&1;\r
- size=(op>>6)&3; if (size>=3) return 1;\r
- ea=op&0x3f;\r
-\r
- if (eor && (ea>>3) == 1) return 1; // not a valid mode for eor\r
-\r
- // See if we can do this opcode:\r
- if (EaCanRead(ea,size)==0) return 1;\r
- if (eor && EaCanWrite(ea)==0) return 1;\r
- if (EaAn(ea)&&(eor||size==0)) return 1;\r
-\r
- use=OpBase(op,size);\r
- use&=~0x0e00; // Use 1 handler for register d0-7\r
- if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op,ea); Cycles=4;\r
- if(eor) {\r
- if(ea>8) Cycles+=4;\r
- if(size>=2) Cycles+=4;\r
- } else {\r
- if(size>=2) Cycles+=2;\r
- }\r
-\r
- ot(";@ Get EA into r11 and value into r0:\n");\r
- EaCalcReadNoSE(eor?11:-1,0,ea,size,0x003f);\r
-\r
- ot(";@ Get register operand into r1:\n");\r
- EaCalcReadNoSE(-1,1,rea,size,0x0e00);\r
-\r
- if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);\r
- if (size<2) asl=(char *)(size?",asl #16":",asl #24");\r
-\r
- ot(";@ Do arithmetic:\n");\r
- if (eor==0) ot(" rsbs r1,r0,r1%s\n",asl);\r
- if (eor)\r
- {\r
- ot(" eor r1,r0,r1%s\n",asl);\r
- ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r
- }\r
-\r
- OpGetFlags(eor==0,0); // Cmp like subtract\r
- ot("\n");\r
-\r
- if (eor) EaWrite(11, 1,ea,size,0x003f,1);\r
-\r
- OpEnd(ea);\r
- return 0;\r
-}\r
-\r
-// Emit a Cmpm opcode, 1011ddd1 xx001sss (rrr=Adst, xx=size extension, sss=Asrc)\r
-int OpCmpm(int op)\r
-{\r
- int size=0,sea=0,dea=0,use=0;\r
- const char *asl="";\r
-\r
- // get size, get EAs\r
- size=(op>>6)&3; if (size>=3) return 1;\r
- sea=(op&7)|0x18;\r
- dea=(op>>9)&0x3f;\r
-\r
- use=op&~0x0e07; // Use 1 handler for all registers..\r
- if (size==0&&sea==0x1f) use|=0x0007; // ..except (a7)+\r
- if (size==0&&dea==0x1f) use|=0x0e00;\r
- if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op,sea); Cycles=4;\r
-\r
- ot(";@ Get src operand into r11:\n");\r
- EaCalc (0,0x0007, sea,size,1);\r
- EaRead (0, 11, sea,size,0x0007,1);\r
-\r
- ot(";@ Get dst operand into r0:\n");\r
- EaCalcReadNoSE(-1,0,dea,size,0x0e00);\r
-\r
- if (size<2) asl=(char *)(size?",asl #16":",asl #24");\r
-\r
- ot(" rsbs r0,r11,r0%s\n",asl);\r
- OpGetFlags(1,0); // Cmp like subtract\r
- ot("\n");\r
-\r
- OpEnd(sea);\r
- return 0;\r
-}\r
-\r
-\r
-// Emit a Chk opcode, 0100ddd1 x0eeeeee (rrr=Dn, x=size extension, eeeeee=ea)\r
-int OpChk(int op)\r
-{\r
- int rea=0;\r
- int size=0,ea=0,use=0;\r
-\r
- // Get EA and register EA\r
- rea=(op>>9)&7;\r
- if((op>>7)&1)\r
- size=1; // word operation\r
- else size=2; // long\r
- ea=op&0x3f;\r
-\r
- if (EaAn(ea)) return 1; // not a valid mode\r
- if (size!=1) return 1; // 000 variant only supports word\r
-\r
- // See if we can do this opcode:\r
- if (EaCanRead(ea,size)==0) return 1;\r
-\r
- use=OpBase(op,size);\r
- use&=~0x0e00; // Use 1 handler for register d0-7\r
- if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
-\r
- OpStart(op,ea); Cycles=10;\r
-\r
- ot(";@ Get value into r0:\n");\r
- EaCalcReadNoSE(-1,0,ea,size,0x003f);\r
-\r
- ot(";@ Get register operand into r1:\n");\r
- EaCalcReadNoSE(-1,1,rea,size,0x0e00);\r
-\r
- if (size<2) ot(" mov r0,r0,asl #%d\n",size?16:24);\r
- if (size<2) ot(" mov r1,r1,asl #%d\n\n",size?16:24);\r
-\r
- ot(";@ get flags, including undocumented ones\n");\r
- ot(" and r3,r10,#0x80000000\n");\r
- ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r
- OpGetFlags(0,0);\r
-\r
- ot(";@ is reg negative?\n");\r
- ot(" bmi chktrap%.4x\n",op);\r
-\r
- ot(";@ Do arithmetic:\n");\r
- ot(" bic r10,r10,#0x80000000 ;@ N\n");\r
- ot(" cmp r1,r0\n");\r
- ot(" bgt chktrap%.4x\n",op);\r
-\r
- ot(";@ old N remains\n");\r
- ot(" orr r10,r10,r3\n");\r
- OpEnd(ea);\r
-\r
- ot("chktrap%.4x%s ;@ CHK exception:\n",op,ms?"":":");\r
- ot(" mov r0,#6\n");\r
- ot(" bl Exception\n");\r
- Cycles+=40;\r
- OpEnd(ea);\r
-\r
- return 0;\r
-}\r
-\r
notaz.gp2x.de / cyclone68000.git / blobdiff