#include "app.h" static FILE *AsmFile=NULL; static int CycloneVer=0x0086; // Version number of library int *CyJump=NULL; // Jump table int ms=USE_MS_SYNTAX; // If non-zero, output in Microsoft ARMASM format char *Narm[4]={ "b", "h","",""}; // Normal ARM Extensions for operand sizes 0,1,2 char *Sarm[4]={"sb","sh","",""}; // Sign-extend ARM Extensions for operand sizes 0,1,2 int Cycles; // Current cycles for opcode void ot(const char *format, ...) { va_list valist=NULL; int i, len; // notaz: stop me from leaving newlines in the middle of format string // and generating bad code for(i=0, len=strlen(format); i < len && format[i] != '\n'; i++); if(i < len-1 && format[len-1] != '\n') printf("\nWARNING: possible improper newline placement:\n%s\n", format); va_start(valist,format); if (AsmFile) vfprintf(AsmFile,format,valist); va_end(valist); } void ltorg() { if (ms) ot(" LTORG\n"); else ot(" .ltorg\n"); } // trashes all temp regs static void PrintException(int ints) { if(!ints) { ot(" ;@ Cause an Exception - Vector address in r0\n"); ot(" mov r11,r0\n"); } ot(";@ swap OSP <-> A7?\n"); ot(" ldr r0,[r7,#0x44] ;@ Get SR high\n"); ot(" tst r0,#0x20\n"); ot(" bne no_sp_swap%i\n",ints); ot(";@ swap OSP and A7:\n"); ot(" ldr r0,[r7,#0x3C] ;@ Get A7\n"); ot(" ldr r1,[r7,#0x48] ;@ Get OSP\n"); ot(" str r0,[r7,#0x48]\n"); ot(" str r1,[r7,#0x3C]\n"); ot("no_sp_swap%i%s\n",ints,ms?"":":"); ot(" ldr r10,[r7,#0x60] ;@ Get Memory base\n"); ot(" mov r1,r4,lsl #8\n"); ot(" sub r1,r1,r10,lsl #8 ;@ r1 = Old PC\n"); ot(" mov r1,r1,asr #8 ;@ push sign extended\n"); OpPush32(); OpPushSr(1); ot(" mov r0,r11\n"); ot(";@ Read IRQ Vector:\n"); MemHandler(0,2); if(ints) { ot(" tst r0,r0 ;@ uninitialized int vector?\n"); ot(" moveq r0,#0x3c\n"); ot(" moveq lr,pc\n"); ot(" ldreq pc,[r7,#0x70] ;@ Call read32(r0) handler\n"); } #if USE_CHECKPC_CALLBACK ot(" add r0,r0,r10 ;@ r0 = Memory Base + New PC\n"); ot(" mov lr,pc\n"); ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n"); ot(" mov r4,r0\n"); #endif ot("\n"); if(!ints) { ot(" ldr r0,[r7,#0x44] ;@ Get SR high\n"); ot(" bic r0,r0,#0xd8 ;@ clear trace and unused flags\n"); ot(" orr r0,r0,#0x20 ;@ set supervisor mode\n"); ot(" strb r0,[r7,#0x44]\n"); } } // Trashes r0,r1 void CheckInterrupt(int op) { ot(";@ CheckInterrupt:\n"); ot(" ldr r1,[r7,#0x44] ;@ Get SR high T_S__III and irq level\n"); ot(" movs r0,r1,lsr #24 ;@ Get IRQ level\n"); // same as ldrb r0,[r7,#0x47] ot(" beq NoInts%x\n",op); ot(" cmp r0,#6 ;@ irq>6 ?\n"); ot(" andle r1,r1,#7 ;@ Get interrupt mask\n"); ot(" cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n"); ot(" blgt CycloneDoInterrupt\n"); ot("NoInts%x%s\n", op,ms?"":":"); ot("\n"); } static void PrintFramework() { ot(";@ --------------------------- Framework --------------------------\n"); if (ms) ot("CycloneRun\n"); else ot("CycloneRun:\n"); ot(" stmdb sp!,{r4-r11,lr}\n"); ot(" mov r7,r0 ;@ r7 = Pointer to Cpu Context\n"); ot(" ;@ r0-3 = Temporary registers\n"); ot(" ldrb r9,[r7,#0x46] ;@ r9 = Flags (NZCV)\n"); ot(" ldr r6,=CycloneJumpTab ;@ r6 = Opcode Jump table\n"); ot(" ldr r5,[r7,#0x5c] ;@ r5 = Cycles\n"); ot(" ldr r4,[r7,#0x40] ;@ r4 = Current PC + Memory Base\n"); ot(" ;@ r8 = Current Opcode\n"); ot(" ldr r1,[r7,#0x44] ;@ Get SR high T_S__III and irq level\n"); ot(" mov r9,r9,lsl #28 ;@ r9 = Flags 0xf0000000, cpsr format\n"); ot(" ;@ r10 = Source value / Memory Base\n"); ot("\n"); ot(";@ CheckInterrupt:\n"); ot(" movs r0,r1,lsr #24 ;@ Get IRQ level\n"); // same as ldrb r0,[r7,#0x47] ot(" beq NoInts0\n"); ot(" cmp r0,#6 ;@ irq>6 ?\n"); ot(" andle r1,r1,#7 ;@ Get interrupt mask\n"); ot(" cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n"); ot(" blgt CycloneDoInterrupt\n"); ot(";@ Check if interrupt used up all the cycles:\n"); ot(" subs r5,r5,#0\n"); ot(" blt CycloneEndNoBack\n"); ot("NoInts0%s\n", ms?"":":"); ot("\n"); ot(";@ Check if our processor is in stopped state and jump to opcode handler if not\n"); ot(" ldr r0,[r7,#0x58]\n"); ot(" ldrh r8,[r4],#2 ;@ Fetch first opcode\n"); ot(" tst r0,r0 ;@ stopped?\n"); ot(" bne CycloneStopped\n"); ot(" ldr pc,[r6,r8,asl #2] ;@ Jump to opcode handler\n"); ot("\n"); ot("\n"); ot(";@ We come back here after execution\n"); ot("CycloneEnd%s\n", ms?"":":"); ot(" sub r4,r4,#2\n"); ot("CycloneEndNoBack%s\n", ms?"":":"); #ifdef CYCLONE_FOR_PICODRIVE ot(" ldr r1,[r7,#0x54]\n"); ot(" mov r9,r9,lsr #28\n"); ot(" tst r1,r1\n"); ot(" bxne r1 ;@ jump to alternative CycloneEnd\n"); #else ot(" mov r9,r9,lsr #28\n"); #endif ot(" str r4,[r7,#0x40] ;@ Save Current PC + Memory Base\n"); ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n"); ot(" strb r9,[r7,#0x46] ;@ Save Flags (NZCV)\n"); ot(" ldmia sp!,{r4-r11,pc}\n"); ot("\n"); ot("CycloneStopped%s\n", ms?"":":"); ot(" mov r5,#0\n"); ot(" str r5,[r7,#0x5C] ;@ eat all cycles\n"); ot(" ldmia sp!,{r4-r11,pc} ;@ we are stopped, do nothing!\n"); ot("\n"); ltorg(); #if COMPRESS_JUMPTABLE ot(";@ uncompress jump table\n"); if (ms) ot("CycloneInit\n"); else ot("CycloneInit:\n"); ot(" ldr r12,=CycloneJumpTab\n"); ot(" add r0,r12,#0xe000*4 ;@ ctrl code pointer\n"); ot(" ldr r1,[r0,#-4]\n"); ot(" tst r1,r1\n"); ot(" movne pc,lr ;@ already uncompressed\n"); ot(" add r3,r12,#0xa000*4 ;@ handler table pointer, r12=dest\n"); ot("unc_loop%s\n", ms?"":":"); ot(" ldrh r1,[r0],#2\n"); ot(" and r2,r1,#0xf\n"); ot(" bic r1,r1,#0xf\n"); ot(" ldr r1,[r3,r1,lsr #2] ;@ r1=handler\n"); ot(" cmp r2,#0xf\n"); ot(" addeq r2,r2,#1 ;@ 0xf is really 0x10\n"); ot(" tst r2,r2\n"); ot(" ldreqh r2,[r0],#2 ;@ counter is in next word\n"); ot(" tst r2,r2\n"); ot(" beq unc_finish ;@ done decompressing\n"); ot(" tst r1,r1\n"); ot(" addeq r12,r12,r2,lsl #2 ;@ 0 handler means we should skip those bytes\n"); ot(" beq unc_loop\n"); ot("unc_loop_in%s\n", ms?"":":"); ot(" subs r2,r2,#1\n"); ot(" str r1,[r12],#4\n"); ot(" bgt unc_loop_in\n"); ot(" b unc_loop\n"); ot("unc_finish%s\n", ms?"":":"); ot(" ldr r12,=CycloneJumpTab\n"); ot(" ;@ set a-line and f-line handlers\n"); ot(" add r0,r12,#0xa000*4\n"); ot(" ldr r1,[r0,#4] ;@ a-line handler\n"); ot(" ldr r3,[r0,#8] ;@ f-line handler\n"); ot(" mov r2,#0x1000\n"); ot("unc_fill3%s\n", ms?"":":"); ot(" subs r2,r2,#1\n"); ot(" str r1,[r0],#4\n"); ot(" bgt unc_fill3\n"); ot(" add r0,r12,#0xf000*4\n"); ot(" mov r2,#0x1000\n"); ot("unc_fill4%s\n", ms?"":":"); ot(" subs r2,r2,#1\n"); ot(" str r3,[r0],#4\n"); ot(" bgt unc_fill4\n"); ot(" bx lr\n"); ltorg(); ot("\n"); #else ot(";@ do nothing\n"); if (ms) ot("CycloneInit\n"); else ot("CycloneInit:\n"); ot(" bx lr\n"); ot("\n"); #endif if (ms) ot("CycloneSetSr\n"); else ot("CycloneSetSr:\n"); ot(" mov r2,r1,lsr #8\n"); ot(" ldrb r3,[r0,#0x44] ;@ get SR high\n"); ot(" eor r3,r3,r2\n"); ot(" tst r3,#0x20\n"); ot(" and r2,r2,#0xa7 ;@ only nonzero bits\n"); ot(" strb r2,[r0,#0x44] ;@ set SR high\n"); ot(" bne setsr_noswap\n"); ot(" ldr r2,[r0,#0x3C] ;@ Get A7\n"); ot(" ldr r3,[r0,#0x48] ;@ Get OSP\n"); ot(" str r3,[r0,#0x3C]\n"); ot(" str r2,[r0,#0x48]\n"); ot("setsr_noswap%s\n",ms?"":":"); ot(" mov r2,r1,lsr #3\n"); ot(" strb r2,[r0,#0x45] ;@ the X flag\n"); ot(" bic r2,r1,#0xf3\n"); ot(" tst r1,#1\n"); ot(" orrne r2,r2,#2\n"); ot(" tst r1,#2\n"); ot(" orrne r2,r2,#1\n"); ot(" strb r2,[r0,#0x46] ;@ flags\n"); ot(" bx lr\n"); ot("\n"); if (ms) ot("CycloneGetSr\n"); else ot("CycloneGetSr:\n"); ot(" ldrb r1,[r0,#0x46] ;@ flags\n"); ot(" bic r2,r1,#0xf3\n"); ot(" tst r1,#1\n"); ot(" orrne r2,r2,#2\n"); ot(" tst r1,#2\n"); ot(" orrne r2,r2,#1\n"); ot(" ldrb r1,[r0,#0x45] ;@ the X flag\n"); ot(" tst r1,#2\n"); ot(" orrne r2,r2,#0x10\n"); ot(" ldrb r1,[r0,#0x44] ;@ the SR high\n"); ot(" orr r0,r2,r1,lsl #8\n"); ot(" bx lr\n"); ot("\n"); ot(";@ DoInterrupt - r0=IRQ number\n"); ot("CycloneDoInterrupt%s\n", ms?"":":"); ot(" stmdb sp!,{lr} ;@ Push ARM return address\n"); ot(";@ Get IRQ Vector address:\n"); ot(" mov r0,r0,asl #2\n"); ot(" add r11,r0,#0x60\n"); PrintException(1); ot(" ldrb r0,[r7,#0x47] ;@ IRQ\n"); ot(" mov r2,#0\n"); ot(" orr r1,r0,#0x20 ;@ Supervisor mode + IRQ number\n"); ot(" strb r1,[r7,#0x44] ;@ Put SR high\n"); ot(";@ Clear stopped states:\n"); ot(" str r2,[r7,#0x58]\n"); ot(" sub r5,r5,#%d ;@ Subtract cycles\n",44); ot("\n"); #if USE_INT_ACK_CALLBACK #if INT_ACK_NEEDS_STUFF ot(" str r4,[r7,#0x40] ;@ Save PC\n"); ot(" mov r1,r9,lsr #28\n"); ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n"); ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n"); #endif ot(" ldr r11,[r7,#0x8c] ;@ IrqCallback\n"); ot(" tst r11,r11\n"); ot(" movne lr,pc\n"); ot(" movne pc,r11 ;@ call IrqCallback if it is defined\n"); #if INT_ACK_CHANGES_STUFF ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n"); ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n"); ot(" mov r9,r9,lsl #28\n"); ot(" ldr r4,[r7,#0x40] ;@ Load PC\n"); #endif #else // not USE_INT_ACK_CALLBACK ot(";@ Clear irq:\n"); ot(" strb r1,[r7,#0x47]\n"); #endif ot(" ldmia sp!,{pc} ;@ Return\n"); ot("\n"); ot("Exception%s\n", ms?"":":"); ot("\n"); ot(" stmdb sp!,{lr} ;@ Preserve ARM return address\n"); PrintException(0); ot(" ldmia sp!,{pc} ;@ Return\n"); ot("\n"); } // --------------------------------------------------------------------------- // Call Read(r0), Write(r0,r1) or Fetch(r0) // Trashes r0-r3,r12,lr int MemHandler(int type,int size) { int func=0; func=0x68+type*0xc+(size<<2); // Find correct offset #if MEMHANDLERS_NEED_PC ot(" str r4,[r7,#0x40] ;@ Save PC\n"); #endif #if MEMHANDLERS_NEED_FLAGS ot(" mov r3,r9,lsr #28\n"); ot(" strb r3,[r7,#0x46] ;@ Save Flags (NZCV)\n"); #endif #if MEMHANDLERS_NEED_CYCLES ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n"); #endif ot(" mov lr,pc\n"); ot(" ldr pc,[r7,#0x%x] ;@ Call ",func); // Document what we are calling: if (type==0) ot("read"); if (type==1) ot("write"); if (type==2) ot("fetch"); if (type==1) ot("%d(r0,r1)",8<>12); fflush(stdout); } // Update progress OpAny(op); } ot("\n"); printf("]\n"); } // helper static void ott(const char *str, int par, const char *nl, int nlp, int counter, int size) { switch(size) { case 0: if((counter&7)==0) ot(ms?" dcb ":" .byte "); break; case 1: if((counter&7)==0) ot(ms?" dcw ":" .hword "); break; case 2: if((counter&7)==0) ot(ms?" dcd ":" .long "); break; } ot(str, par); if((counter&7)==7) ot(nl,nlp); else ot(","); } static void PrintJumpTable() { int i=0,op=0,len=0; ot(";@ -------------------------- Jump Table --------------------------\n"); #if COMPRESS_JUMPTABLE int handlers=0,reps=0,*indexes,ip,u,out; // use some weird compression on the jump table indexes=(int *)malloc(0x10000*4); if(!indexes) { printf("ERROR: out of memory\n"); exit(1); } len=0x10000; // space for decompressed table ot(ms?" area |.data|, data\n":" .data\n .align 4\n\n"); ot("CycloneJumpTab%s\n", ms?"":":"); if(ms) { for(i = 0; i < 0xa000/8; i++) ot(" dcd 0,0,0,0,0,0,0,0\n"); } else ot(" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", 0xa000/8); // hanlers live in "a-line" part of the table // first output nop,a-line,f-line handlers ot(ms?" dcd Op____,Op__al,Op__fl,":" .long Op____,Op__al,Op__fl,"); handlers=3; for(i=0;i=0; u--) if(op == CyJump[u]) break; // already done with this op? if(u==-1 && op >= 0) { ott("Op%.4x",op," ;@ %.4x\n",i,handlers,2); indexes[op] = handlers; handlers++; } } if(handlers&7) { fseek(AsmFile, -1, SEEK_CUR); // remove last comma for(i = 8-(handlers&7); i > 0; i--) ot(",000000"); ot("\n"); } if(ms) { for(i = (0x4000-handlers)/8; i > 0; i--) ot(" dcd 0,0,0,0,0,0,0,0\n"); } else { ot(ms?"":" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", (0x4000-handlers)/8); } printf("total distinct hanlers: %i\n",handlers); // output data for(i=0,ip=0; i < 0xf000; i++, ip++) { op=CyJump[i]; if(op == -2) { // it must skip a-line area, because we keep our data there ott("0x%.4x", handlers<<4, "\n",0,ip++,1); ott("0x%.4x", 0x1000, "\n",0,ip,1); i+=0xfff; continue; } for(reps=1; i < 0xf000; i++, reps++) if(op != CyJump[i+1]) break; if(op>=0) out=indexes[op]<<4; else out=0; // unrecognised if(reps <= 0xe || reps==0x10) { if(reps!=0x10) out|=reps; else out|=0xf; // 0xf means 0x10 (0xf appeared to be unused anyway) ott("0x%.4x", out, "\n",0,ip,1); } else { ott("0x%.4x", out, "\n",0,ip++,1); ott("0x%.4x", reps,"\n",0,ip,1); } } if(ip&1) ott("0x%.4x", 0, "\n",0,ip++,1); if(ip&7) fseek(AsmFile, -1, SEEK_CUR); // remove last comma ot("\n"); if(ip&7) { for(i = 8-(ip&7); i > 0; i--) ot(",0x0000"); ot("\n"); } if(ms) { for(i = (0x2000-ip/2)/8+1; i > 0; i--) ot(" dcd 0,0,0,0,0,0,0,0\n"); } else { ot(" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", (0x2000-ip/2)/8+1); } ot("\n"); free(indexes); #else ot("CycloneJumpTab%s\n", ms?"":":"); len=0xfffe; // Hmmm, armasm 2.50.8684 messes up with a 0x10000 long jump table // notaz: same thing with GNU as 2.9-psion-98r2 (reloc overflow) // this is due to COFF objects using only 2 bytes for reloc count for (i=0;i=0) ott("Op%.4x",op," ;@ %.4x\n",i-7,i,2); else if(op==-2) ott("Op__al",0, " ;@ %.4x\n",i-7,i,2); else if(op==-3) ott("Op__fl",0, " ;@ %.4x\n",i-7,i,2); else ott("Op____",0, " ;@ %.4x\n",i-7,i,2); } if(i&7) fseek(AsmFile, -1, SEEK_CUR); // remove last comma ot("\n"); ot(";@ notaz: we don't want to crash if we run into those 2 missing opcodes\n"); ot(";@ so we leave this pattern to patch it later\n"); ot("%s 0x78563412\n", ms?" dcd":" .long"); ot("%s 0x56341290\n", ms?" dcd":" .long"); #endif } static int CycloneMake() { int i; char *name="Cyclone.s"; // Open the assembly file if (ms) name="Cyclone.asm"; AsmFile=fopen(name,"wt"); if (AsmFile==NULL) return 1; printf("Making %s...\n",name); ot("\n;@ Dave's Cyclone 68000 Emulator v%x.%.3x - Assembler Output\n\n",CycloneVer>>12,CycloneVer&0xfff); ot(";@ (c) Copyright 2003 Dave, All rights reserved.\n"); ot(";@ some code (c) Copyright 2005-2006 notaz, All rights reserved.\n"); ot(";@ Cyclone 68000 is free for non-commercial use.\n\n"); ot(";@ For commercial use, separate licencing terms must be obtained.\n\n"); CyJump=(int *)malloc(0x40000); if (CyJump==NULL) return 1; memset(CyJump,0xff,0x40000); // Init to -1 for(i=0xa000; i<0xb000; i++) CyJump[i] = -2; // a-line emulation for(i=0xf000; i<0x10000; i++) CyJump[i] = -3; // f-line emulation if (ms) { ot(" area |.text|, code\n"); ot(" export CycloneInit\n"); ot(" export CycloneRun\n"); ot(" export CycloneSetSr\n"); ot(" export CycloneGetSr\n"); ot(" export CycloneVer\n"); ot("\n"); ot("CycloneVer dcd 0x%.4x\n",CycloneVer); } else { ot(" .global CycloneInit\n"); ot(" .global CycloneRun\n"); ot(" .global CycloneSetSr\n"); ot(" .global CycloneGetSr\n"); ot(" .global CycloneVer\n"); #ifdef CYCLONE_FOR_PICODRIVE ot(" .global CycloneDoInterrupt\n"); ot(" .global CycloneJumpTab\n"); #endif ot("CycloneVer: .long 0x%.4x\n",CycloneVer); } ot("\n"); PrintFramework(); PrintOpcodes(); PrintJumpTable(); if (ms) ot(" END\n"); ot("\n\n;@ vim:filetype=armasm\n"); fclose(AsmFile); AsmFile=NULL; #if 0 printf("Assembling...\n"); // Assemble the file if (ms) system("armasm Cyclone.asm"); else system("as -o Cyclone.o Cyclone.s"); printf("Done!\n\n"); #endif free(CyJump); return 0; } int main() { printf("\n Dave's Cyclone 68000 Emulator v%x.%.3x - Core Creator\n\n",CycloneVer>>12,CycloneVer&0xfff); // Make GAS or ARMASM version CycloneMake(); return 0; }