+++ /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
-int earead_check_addrerr = 1, eawrite_check_addrerr = 0;\r
-\r
-// some ops use non-standard cycle counts for EAs, so are listed here.\r
-// all constants borrowed from the MUSASHI core by Karl Stenerud.\r
-\r
-/* Extra cycles for JMP instruction (000, 010) */\r
-int g_jmp_cycle_table[8] =\r
-{\r
- 4, /* EA_MODE_AI */\r
- 6, /* EA_MODE_DI */\r
- 10, /* EA_MODE_IX */\r
- 6, /* EA_MODE_AW */\r
- 8, /* EA_MODE_AL */\r
- 6, /* EA_MODE_PCDI */\r
- 10, /* EA_MODE_PCIX */\r
- 0, /* EA_MODE_I */\r
-};\r
-\r
-/* Extra cycles for JSR instruction (000, 010) */\r
-int g_jsr_cycle_table[8] =\r
-{\r
- 4, /* EA_MODE_AI */\r
- 6, /* EA_MODE_DI */\r
- 10, /* EA_MODE_IX */\r
- 6, /* EA_MODE_AW */\r
- 8, /* EA_MODE_AL */\r
- 6, /* EA_MODE_PCDI */\r
- 10, /* EA_MODE_PCIX */\r
- 0, /* EA_MODE_I */\r
-};\r
-\r
-/* Extra cycles for LEA instruction (000, 010) */\r
-int g_lea_cycle_table[8] =\r
-{\r
- 4, /* EA_MODE_AI */\r
- 8, /* EA_MODE_DI */\r
- 12, /* EA_MODE_IX */\r
- 8, /* EA_MODE_AW */\r
- 12, /* EA_MODE_AL */\r
- 8, /* EA_MODE_PCDI */\r
- 12, /* EA_MODE_PCIX */\r
- 0, /* EA_MODE_I */\r
-};\r
-\r
-/* Extra cycles for PEA instruction (000, 010) */\r
-int g_pea_cycle_table[8] =\r
-{\r
- 6, /* EA_MODE_AI */\r
- 10, /* EA_MODE_DI */\r
- 14, /* EA_MODE_IX */\r
- 10, /* EA_MODE_AW */\r
- 14, /* EA_MODE_AL */\r
- 10, /* EA_MODE_PCDI */\r
- 14, /* EA_MODE_PCIX */\r
- 0, /* EA_MODE_I */\r
-};\r
-\r
-/* Extra cycles for MOVEM instruction (000, 010) */\r
-int g_movem_cycle_table[8] =\r
-{\r
- 0, /* EA_MODE_AI */\r
- 4, /* EA_MODE_DI */\r
- 6, /* EA_MODE_IX */\r
- 4, /* EA_MODE_AW */\r
- 8, /* EA_MODE_AL */\r
- 0, /* EA_MODE_PCDI */\r
- 0, /* EA_MODE_PCIX */\r
- 0, /* EA_MODE_I */\r
-};\r
-\r
-// add nonstandard EA\r
-int Ea_add_ns(int *tab, int ea)\r
-{\r
- if(ea<0x10) return 0;\r
- if((ea&0x38)==0x10) return tab[0]; // (An) (ai)\r
- if(ea<0x28) return 0;\r
- if(ea<0x30) return tab[1]; // ($nn,An) (di)\r
- if(ea<0x38) return tab[2]; // ($nn,An,Rn) (ix)\r
- if(ea==0x38) return tab[3]; // (aw)\r
- if(ea==0x39) return tab[4]; // (al)\r
- if(ea==0x3a) return tab[5]; // ($nn,PC) (pcdi)\r
- if(ea==0x3b) return tab[6]; // ($nn,pc,Rn) (pcix)\r
- if(ea==0x3c) return tab[7]; // #$nnnn (i)\r
- return 0;\r
-}\r
-\r
-\r
-// ---------------------------------------------------------------------------\r
-// Gets the offset of a register for an ea, and puts it in 'r'\r
-// Shifted left by 'shift'\r
-// Doesn't trash anything\r
-static int EaCalcReg(int r,int ea,int mask,int forceor,int shift,int noshift=0)\r
-{\r
- int i=0,low=0,needor=0;\r
- int lsl=0;\r
-\r
- for (i=mask|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is\r
- mask&=0xf<<low; // This is the max we can do\r
-\r
- if (ea>=8)\r
- {\r
- needor=1; // Need to OR to access A0-7\r
- if ((g_op>>low)&8) { needor=0; mask|=8<<low; } // Ah - no we don't actually need to or, since the bit is high in r8\r
- if (forceor) needor=1; // Special case for 0x30-0x38 EAs ;)\r
- }\r
-\r
- ot(" and r%d,r8,#0x%.4x\n",r,mask);\r
- if (needor) ot(" orr r%d,r%d,#0x%x ;@ A0-7\n",r,r,8<<low);\r
-\r
- // Find out amount to shift left:\r
- lsl=shift-low;\r
-\r
- if (lsl&&!noshift)\r
- {\r
- ot(" mov r%d,r%d,",r,r);\r
- if (lsl>0) ot("lsl #%d\n", lsl);\r
- else ot("lsr #%d\n",-lsl);\r
- }\r
-\r
- return 0;\r
-}\r
-\r
-// EaCalc - ARM Register 'a' = Effective Address\r
-// If ea>=0x10, trashes r0,r2 and r3, else nothing\r
-// size values 0, 1, 2 ~ byte, word, long\r
-// mask shows usable bits in r8\r
-int EaCalc(int a,int mask,int ea,int size,int top,int sign_extend)\r
-{\r
- char text[32]="";\r
- int func=0;\r
-\r
- DisaPc=2; DisaGetEa(text,ea,size); // Get text version of the effective address\r
- func=0x68+(size<<2); // Get correct read handler\r
-\r
- if (ea<0x10)\r
- {\r
- int noshift=0;\r
- if (size>=2||(size==0&&(top||!sign_extend))) noshift=1; // Saves one opcode\r
-\r
- ot(";@ EaCalc : Get register index into r%d:\n",a);\r
-\r
- EaCalcReg(a,ea,mask,0,2,noshift);\r
- return 0;\r
- }\r
-\r
- ot(";@ EaCalc : Get '%s' into r%d:\n",text,a);\r
- // (An), (An)+, -(An)\r
- if (ea<0x28)\r
- {\r
- int step=1<<size, strr=a;\r
- int low=0,lsl=0,i;\r
-\r
- if ((ea&7)==7 && step<2) step=2; // move.b (a7)+ or -(a7) steps by 2 not 1\r
-\r
- if (ea==0x1f||ea==0x27) // A7 handlers are always separate\r
- {\r
- ot(" ldr r%d,[r7,#0x3c] ;@ A7\n",a);\r
- }\r
- else\r
- {\r
- EaCalcReg(2,ea,mask,0,0,1);\r
- if(mask)\r
- for (i=mask|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is\r
- lsl=2-low; // Having a lsl #x here saves one opcode\r
- if (lsl>=0) ot(" ldr r%d,[r7,r2,lsl #%i]\n",a,lsl);\r
- else if (lsl<0) ot(" ldr r%d,[r7,r2,lsr #%i]\n",a,-lsl);\r
- }\r
-\r
- if ((ea&0x38)==0x18) // (An)+\r
- {\r
- ot(" add r3,r%d,#%d ;@ Post-increment An\n",a,step);\r
- strr=3;\r
- }\r
-\r
- if ((ea&0x38)==0x20) // -(An)\r
- ot(" sub r%d,r%d,#%d ;@ Pre-decrement An\n",a,a,step);\r
-\r
- if ((ea&0x38)==0x18||(ea&0x38)==0x20)\r
- {\r
- if (ea==0x1f||ea==0x27)\r
- {\r
- ot(" str r%d,[r7,#0x3c] ;@ A7\n",strr);\r
- }\r
- else\r
- {\r
- if (lsl>=0) ot(" str r%d,[r7,r2,lsl #%i]\n",strr,lsl);\r
- else if (lsl<0) ot(" str r%d,[r7,r2,lsr #%i]\n",strr,-lsl);\r
- }\r
- }\r
-\r
- if ((ea&0x38)==0x20) Cycles+=size<2 ? 6:10; // -(An) Extra cycles\r
- else Cycles+=size<2 ? 4:8; // (An),(An)+ Extra cycles\r
- return 0;\r
- }\r
-\r
- if (ea<0x30) // ($nn,An) (di)\r
- {\r
- ot(" ldrsh r0,[r4],#2 ;@ Fetch offset\n"); pc_dirty=1;\r
- EaCalcReg(2,8,mask,0,0);\r
- ot(" ldr r2,[r7,r2,lsl #2]\n");\r
- ot(" add r%d,r0,r2 ;@ Add on offset\n",a);\r
- Cycles+=size<2 ? 8:12; // Extra cycles\r
- return 0;\r
- }\r
-\r
- if (ea<0x38) // ($nn,An,Rn) (ix)\r
- {\r
- ot(";@ Get extension word into r3:\n");\r
- ot(" ldrh r3,[r4],#2 ;@ ($Disp,PC,Rn)\n"); pc_dirty=1;\r
- ot(" mov r2,r3,lsr #10\n");\r
- ot(" tst r3,#0x0800 ;@ Is Rn Word or Long\n");\r
- ot(" and r2,r2,#0x3c ;@ r2=Index of Rn\n");\r
- ot(" ldreqsh r2,[r7,r2] ;@ r2=Rn.w\n");\r
- ot(" ldrne r2,[r7,r2] ;@ r2=Rn.l\n");\r
- ot(" mov r0,r3,asl #24 ;@ r0=Get 8-bit signed Disp\n");\r
- ot(" add r3,r2,r0,asr #24 ;@ r3=Disp+Rn\n");\r
-\r
- EaCalcReg(2,8,mask,1,0);\r
- ot(" ldr r2,[r7,r2,lsl #2]\n");\r
- ot(" add r%d,r2,r3 ;@ r%d=Disp+An+Rn\n",a,a);\r
- Cycles+=size<2 ? 10:14; // Extra cycles\r
- return 0;\r
- }\r
-\r
- if (ea==0x38) // (aw)\r
- {\r
- ot(" ldrsh r%d,[r4],#2 ;@ Fetch Absolute Short address\n",a); pc_dirty=1;\r
- Cycles+=size<2 ? 8:12; // Extra cycles\r
- return 0;\r
- }\r
-\r
- if (ea==0x39) // (al)\r
- {\r
- ot(" ldrh r2,[r4],#2 ;@ Fetch Absolute Long address\n");\r
- ot(" ldrh r0,[r4],#2\n"); pc_dirty=1;\r
- ot(" orr r%d,r0,r2,lsl #16\n",a);\r
- Cycles+=size<2 ? 12:16; // Extra cycles\r
- return 0;\r
- }\r
-\r
- if (ea==0x3a) // ($nn,PC) (pcdi)\r
- {\r
- ot(" ldr r0,[r7,#0x60] ;@ Get Memory base\n");\r
- ot(" sub r0,r4,r0 ;@ Real PC\n");\r
- ot(" ldrsh r2,[r4],#2 ;@ Fetch extension\n"); pc_dirty=1;\r
- ot(" mov r0,r0,lsl #8\n");\r
- ot(" add r%d,r2,r0,asr #8 ;@ ($nn,PC)\n",a);\r
- Cycles+=size<2 ? 8:12; // Extra cycles\r
- return 0;\r
- }\r
-\r
- if (ea==0x3b) // ($nn,pc,Rn) (pcix)\r
- {\r
- ot(" ldr r0,[r7,#0x60] ;@ Get Memory base\n");\r
- ot(" ldrh r3,[r4] ;@ Get extension word\n");\r
- ot(" sub r0,r4,r0 ;@ r0=PC\n");\r
- ot(" add r4,r4,#2\n"); pc_dirty=1;\r
- ot(" mov r0,r0,asl #8 ;@ use only 24bits of PC\n");\r
- ot(" mov r2,r3,lsr #10\n");\r
- ot(" tst r3,#0x0800 ;@ Is Rn Word or Long\n");\r
- ot(" and r2,r2,#0x3c ;@ r2=Index of Rn\n");\r
- ot(" ldreqsh r2,[r7,r2] ;@ r2=Rn.w\n");\r
- ot(" ldrne r2,[r7,r2] ;@ r2=Rn.l\n");\r
- ot(" mov r3,r3,asl #24 ;@ r3=Get 8-bit signed Disp\n");\r
- ot(" add r2,r2,r3,asr #24 ;@ r2=Disp+Rn\n");\r
- ot(" add r%d,r2,r0,asr #8 ;@ r%d=Disp+PC+Rn\n",a,a);\r
- Cycles+=size<2 ? 10:14; // Extra cycles\r
- return 0;\r
- }\r
-\r
- if (ea==0x3c) // #$nnnn (i)\r
- {\r
- if (size<2)\r
- {\r
- ot(" ldr%s r%d,[r4],#2 ;@ Fetch immediate value\n",Sarm[size&3],a); pc_dirty=1;\r
- Cycles+=4; // Extra cycles\r
- return 0;\r
- }\r
-\r
- ot(" ldrh r2,[r4],#2 ;@ Fetch immediate value\n");\r
- ot(" ldrh r3,[r4],#2\n"); pc_dirty=1;\r
- ot(" orr r%d,r3,r2,lsl #16\n",a);\r
- Cycles+=8; // Extra cycles\r
- return 0;\r
- }\r
-\r
- return 1;\r
-}\r
-\r
-// ---------------------------------------------------------------------------\r
-// Read effective address in (ARM Register 'a') to ARM register 'v'\r
-// 'a' and 'v' can be anything but 0 is generally best (for both)\r
-// If (ea<0x10) nothing is trashed, else r0-r3 is trashed\r
-// If 'top' is given, the ARM register v shifted to the top, e.g. 0xc000 -> 0xc0000000\r
-// If top is 0 and sign_extend is not, then ARM register v is sign extended,\r
-// e.g. 0xc000 -> 0xffffc000 (else it may or may not be sign extended)\r
-\r
-int EaRead(int a,int v,int ea,int size,int mask,int top,int sign_extend)\r
-{\r
- char text[32]="";\r
- int shift=0;\r
-\r
- shift=32-(8<<size);\r
-\r
- DisaPc=2; DisaGetEa(text,ea,size); // Get text version of the effective address\r
-\r
- if (ea<0x10)\r
- {\r
- int lsl=0,low=0,nsarm=size&3,i;\r
- if (size>=2||(size==0&&(top||!sign_extend))) {\r
- if(mask)\r
- for (i=mask|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is\r
- lsl=2-low; // Having a lsl #2 here saves one opcode\r
- }\r
-\r
- if (top||!sign_extend) nsarm=3;\r
-\r
- ot(";@ EaRead : Read register[r%d] into r%d:\n",a,v);\r
-\r
- if (lsl>0) ot(" ldr%s r%d,[r7,r%d,lsl #%i]\n",Narm[nsarm],v,a,lsl);\r
- else if (lsl<0) ot(" ldr%s r%d,[r7,r%d,lsr #%i]\n",Narm[nsarm],v,a,-lsl);\r
- else ot(" ldr%s r%d,[r7,r%d]\n",Sarm[nsarm],v,a);\r
-\r
- if (top&&shift) ot(" mov r%d,r%d,asl #%d\n",v,v,shift);\r
-\r
- ot("\n"); return 0;\r
- }\r
-\r
- ot(";@ EaRead : Read '%s' (address in r%d) into r%d:\n",text,a,v);\r
-\r
- if (ea==0x3c)\r
- {\r
- int asl=0;\r
-\r
- if (top) asl=shift;\r
-\r
- if (asl) ot(" mov r%d,r%d,asl #%d\n",v,a,asl);\r
- else if (v!=a) ot(" mov r%d,r%d\n",v,a);\r
- ot("\n"); return 0;\r
- }\r
-\r
- if (ea>=0x3a && ea<=0x3b) MemHandler(2,size,a,earead_check_addrerr); // Fetch\r
- else MemHandler(0,size,a,earead_check_addrerr); // Read\r
-\r
- // defaults to 1, as most things begins with a read\r
- earead_check_addrerr=1;\r
-\r
- if (sign_extend)\r
- {\r
- int d_reg=0;\r
- if (shift) {\r
- ot(" mov r%d,r%d,asl #%d\n",v,d_reg,shift);\r
- d_reg=v;\r
- }\r
- if (!top && shift) {\r
- ot(" mov r%d,r%d,asr #%d\n",v,d_reg,shift);\r
- d_reg=v;\r
- }\r
- if (d_reg != v)\r
- ot(" mov r%d,r%d\n",v,d_reg);\r
- }\r
- else\r
- {\r
- if (top && shift)\r
- ot(" mov r%d,r0,asl #%d\n",v,shift);\r
- else if (v!=0)\r
- ot(" mov r%d,r0\n",v);\r
- }\r
-\r
- ot("\n"); return 0;\r
-}\r
-\r
-// calculate EA and read\r
-// if (ea < 0x10) nothing is trashed\r
-// if (ea == 0x3c) r2 and r3 are trashed\r
-// else r0-r3 are trashed\r
-// size values 0, 1, 2 ~ byte, word, long\r
-// r_ea is reg to store ea in (-1 means ea is not needed), r is dst reg\r
-// if sign_extend is 0, non-32bit values will have MS bits undefined\r
-int EaCalcRead(int r_ea,int r,int ea,int size,int mask,int sign_extend)\r
-{\r
- if (ea<0x10)\r
- {\r
- if (r_ea==-1)\r
- {\r
- r_ea=r;\r
- if (!sign_extend) size=2;\r
- }\r
- }\r
- else if (ea==0x3c) // #imm\r
- {\r
- r_ea=r;\r
- }\r
- else\r
- {\r
- if (r_ea==-1) r_ea=0;\r
- }\r
-\r
- EaCalc (r_ea,mask,ea,size,0,sign_extend);\r
- EaRead (r_ea, r,ea,size,mask,0,sign_extend);\r
-\r
- return 0;\r
-}\r
-\r
-int EaCalcReadNoSE(int r_ea,int r,int ea,int size,int mask)\r
-{\r
- return EaCalcRead(r_ea,r,ea,size,mask,0);\r
-}\r
-\r
-// Return 1 if we can read this ea\r
-int EaCanRead(int ea,int size)\r
-{\r
- if (size<0)\r
- {\r
- // LEA:\r
- // These don't make sense?:\r
- if (ea< 0x10) return 0; // Register\r
- if (ea==0x3c) return 0; // Immediate\r
- if (ea>=0x18 && ea<0x28) return 0; // Pre/Post inc/dec An\r
- }\r
-\r
- if (ea<=0x3c) return 1;\r
- return 0;\r
-}\r
-\r
-// ---------------------------------------------------------------------------\r
-// Write effective address (ARM Register 'a') with ARM register 'v'\r
-// Trashes r0-r3,r12,lr; 'a' can be 0 or 2+, 'v' can be 1 or higher\r
-// If a==0 and v==1 it's faster though.\r
-int EaWrite(int a,int v,int ea,int size,int mask,int top,int sign_extend_ea)\r
-{\r
- char text[32]="";\r
- int shift=0;\r
-\r
- if(a == 1) { printf("Error! EaWrite a==1 !\n"); return 1; }\r
-\r
- if (top) shift=32-(8<<size);\r
-\r
- DisaPc=2; DisaGetEa(text,ea,size); // Get text version of the effective address\r
-\r
- if (ea<0x10)\r
- {\r
- int lsl=0,low=0,i;\r
- if (size>=2||(size==0&&(top||!sign_extend_ea))) {\r
- if(mask)\r
- for (i=mask|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is\r
- lsl=2-low; // Having a lsl #x here saves one opcode\r
- }\r
-\r
- ot(";@ EaWrite: r%d into register[r%d]:\n",v,a);\r
- if (shift) ot(" mov r%d,r%d,asr #%d\n",v,v,shift);\r
-\r
- if (lsl>0) ot(" str%s r%d,[r7,r%d,lsl #%i]\n",Narm[size&3],v,a,lsl);\r
- else if (lsl<0) ot(" str%s r%d,[r7,r%d,lsr #%i]\n",Narm[size&3],v,a,-lsl);\r
- else ot(" str%s r%d,[r7,r%d]\n",Narm[size&3],v,a);\r
-\r
- ot("\n"); return 0;\r
- }\r
-\r
- ot(";@ EaWrite: Write r%d into '%s' (address in r%d):\n",v,text,a);\r
-\r
- if (ea==0x3c) { ot("Error! Write EA=0x%x\n\n",ea); return 1; }\r
-\r
- if (shift) ot(" mov r1,r%d,asr #%d\n",v,shift);\r
- else if (v!=1) ot(" mov r1,r%d\n",v);\r
-\r
- MemHandler(1,size,a,eawrite_check_addrerr); // Call write handler\r
-\r
- // not check by default, because most cases are rmw and\r
- // address was already checked before reading\r
- eawrite_check_addrerr = 0;\r
-\r
- ot("\n"); return 0;\r
-}\r
-\r
-// Return 1 if we can write this ea\r
-int EaCanWrite(int ea)\r
-{\r
- if (ea<=0x39) return 1; // 3b?\r
- return 0;\r
-}\r
-// ---------------------------------------------------------------------------\r
-\r
-// Return 1 if EA is An reg\r
-int EaAn(int ea)\r
-{\r
- if((ea&0x38)==8) return 1;\r
- return 0;\r
-}\r
-\r
notaz.gp2x.de / cyclone68000.git / blobdiff