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- #include "app.h"
- int opend_op_changes_cycles, opend_check_interrupt, opend_check_trace;
- static unsigned char OpData[16]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
- static unsigned short OpRead16(unsigned int a)
- {
- return (unsigned short)( (OpData[a&15]<<8) | OpData[(a+1)&15] );
- }
- // For opcode 'op' use handler 'use'
- void OpUse(int op,int use)
- {
- char text[64]="";
- CyJump[op]=use;
- if (op!=use) return;
- // Disassemble opcode
- DisaPc=0;
- DisaText=text;
- DisaWord=OpRead16;
- DisaGet();
- ot(";@ ---------- [%.4x] %s uses Op%.4x ----------\n",op,text,use);
- }
- void OpStart(int op, int sea, int tea, int op_changes_cycles, int supervisor_check)
- {
- int last_op_count=arm_op_count;
- Cycles=0;
- OpUse(op,op); // This opcode obviously uses this handler
- ot("Op%.4x%s\n", op, ms?"":":");
- if (supervisor_check)
- {
- // checks for supervisor bit, if not set, jumps to SuperEnd()
- // also sets r11 to SR high value, SuperChange() uses this
- ot(" ldr r11,[r7,#0x44] ;@ Get SR high\n");
- }
- if ((sea >= 0x10 && sea != 0x3c) || (tea >= 0x10 && tea != 0x3c))
- {
- #if MEMHANDLERS_NEED_PREV_PC
- ot(" str r4,[r7,#0x50] ;@ Save prev PC + 2\n");
- #endif
- #if MEMHANDLERS_NEED_CYCLES
- ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");
- #endif
- }
- if (supervisor_check)
- {
- ot(" tst r11,#0x20 ;@ Check we are in supervisor mode\n");
- ot(" beq WrongPrivilegeMode ;@ No\n");
- }
- if ((sea >= 0x10 && sea != 0x3c) || (tea >= 0x10 && tea != 0x3c)) {
- #if MEMHANDLERS_CHANGE_CYCLES
- if (op_changes_cycles)
- ot(" mov r5,#0\n");
- #endif
- }
- if (last_op_count!=arm_op_count)
- ot("\n");
- pc_dirty = 1;
- opend_op_changes_cycles = opend_check_interrupt = opend_check_trace = 0;
- }
- void OpEnd(int sea, int tea)
- {
- int did_fetch=0;
- opend_check_trace = opend_check_trace && EMULATE_TRACE;
- #if MEMHANDLERS_CHANGE_CYCLES
- if ((sea >= 0x10 && sea != 0x3c) || (tea >= 0x10 && tea != 0x3c))
- {
- if (opend_op_changes_cycles)
- {
- ot(" ldr r0,[r7,#0x5c] ;@ Load Cycles\n");
- ot(" ldrh r8,[r4],#2 ;@ Fetch next opcode\n");
- ot(" add r5,r0,r5\n");
- did_fetch=1;
- }
- else
- {
- ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");
- }
- }
- #endif
- if (!did_fetch)
- ot(" ldrh r8,[r4],#2 ;@ Fetch next opcode\n");
- if (opend_check_trace)
- ot(" ldr r1,[r7,#0x44]\n");
- ot(" subs r5,r5,#%d ;@ Subtract cycles\n",Cycles);
- if (opend_check_trace)
- {
- ot(";@ CheckTrace:\n");
- ot(" tst r1,#0x80\n");
- ot(" bne CycloneDoTraceWithChecks\n");
- ot(" cmp r5,#0\n");
- }
- if (opend_check_interrupt)
- {
- ot(" blt CycloneEnd\n");
- ot(";@ CheckInterrupt:\n");
- if (!opend_check_trace)
- ot(" ldr r1,[r7,#0x44]\n");
- ot(" movs r0,r1,lsr #24 ;@ Get IRQ level\n"); // same as ldrb r0,[r7,#0x47]
- ot(" ldreq pc,[r6,r8,asl #2] ;@ Jump to next opcode handler\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(" ldrle pc,[r6,r8,asl #2] ;@ Jump to next opcode handler\n");
- ot(" b CycloneDoInterruptGoBack\n");
- }
- else
- {
- ot(" ldrge pc,[r6,r8,asl #2] ;@ Jump to opcode handler\n");
- ot(" b CycloneEnd\n");
- }
- ot("\n");
- }
- int OpBase(int op,int size,int sepa)
- {
- int ea=op&0x3f; // Get Effective Address
- if (ea<0x10) return sepa?(op&~0x7):(op&~0xf); // Use 1 handler for d0-d7 and a0-a7
- if (size==0&&(ea==0x1f || ea==0x27)) return op; // Specific handler for (a7)+ and -(a7)
- if (ea<0x38) return op&~7; // Use 1 handler for (a0)-(a7), etc...
- return op;
- }
- // Get flags, trashes r2
- int OpGetFlags(int subtract,int xbit,int specialz)
- {
- if (specialz) ot(" orr r2,r9,#0xb0000000 ;@ for old Z\n");
- ot(" mrs r9,cpsr ;@ r9=flags\n");
- if (specialz) ot(" andeq r9,r9,r2 ;@ fix Z\n");
- if (subtract) ot(" eor r9,r9,#0x20000000 ;@ Invert carry\n");
- if (xbit)
- {
- ot(" str r9,[r7,#0x4c] ;@ Save X bit\n");
- }
- return 0;
- }
- // -----------------------------------------------------------------
- int g_op;
- void OpAny(int op)
- {
- memset(OpData,0x33,sizeof(OpData));
- OpData[0]=(unsigned char)(op>>8);
- OpData[1]=(unsigned char)op;
- g_op=op;
- if ((op&0xf100)==0x0000) OpArith(op); // +
- if ((op&0xc000)==0x0000) OpMove(op); // +
- if ((op&0xf5bf)==0x003c) OpArithSr(op); // + Ori/Andi/Eori $nnnn,sr
- if ((op&0xf100)==0x0100) OpBtstReg(op); // +
- if ((op&0xf138)==0x0108) OpMovep(op); // +
- if ((op&0xff00)==0x0800) OpBtstImm(op); // +
- if ((op&0xf900)==0x4000) OpNeg(op); // +
- if ((op&0xf140)==0x4100) OpChk(op); // +
- if ((op&0xf1c0)==0x41c0) OpLea(op); // +
- if ((op&0xf9c0)==0x40c0) OpMoveSr(op); // +
- if ((op&0xffc0)==0x4800) OpNbcd(op); // +
- if ((op&0xfff8)==0x4840) OpSwap(op); // +
- if ((op&0xffc0)==0x4840) OpPea(op); // +
- if ((op&0xffb8)==0x4880) OpExt(op); // +
- if ((op&0xfb80)==0x4880) OpMovem(op); // +
- if ((op&0xff00)==0x4a00) OpTst(op); // +
- if ((op&0xffc0)==0x4ac0) OpTas(op); // +
- if ((op&0xfff0)==0x4e40) OpTrap(op); // +
- if ((op&0xfff8)==0x4e50) OpLink(op); // +
- if ((op&0xfff8)==0x4e58) OpUnlk(op); // +
- if ((op&0xfff0)==0x4e60) OpMoveUsp(op); // +
- if ((op&0xfff8)==0x4e70) Op4E70(op); // + Reset/Rts etc
- if ((op&0xfffd)==0x4e70) OpStopReset(op);// +
- if ((op&0xff80)==0x4e80) OpJsr(op); // +
- if ((op&0xf000)==0x5000) OpAddq(op); // +
- if ((op&0xf0c0)==0x50c0) OpSet(op); // +
- if ((op&0xf0f8)==0x50c8) OpDbra(op); // +
- if ((op&0xf000)==0x6000) OpBranch(op); // +
- if ((op&0xf100)==0x7000) OpMoveq(op); // +
- if ((op&0xa000)==0x8000) OpArithReg(op); // + Or/Sub/And/Add
- if ((op&0xb1f0)==0x8100) OpAbcd(op); // +
- if ((op&0xb0c0)==0x80c0) OpMul(op); // +
- if ((op&0x90c0)==0x90c0) OpAritha(op); // +
- if ((op&0xb130)==0x9100) OpAddx(op); // +
- if ((op&0xf000)==0xb000) OpCmpEor(op); // +
- if ((op&0xf138)==0xb108) OpCmpm(op); // +
- if ((op&0xf130)==0xc100) OpExg(op); // +
- if ((op&0xf000)==0xe000) OpAsr(op); // + Asr/l/Ror/l etc
- if ((op&0xf8c0)==0xe0c0) OpAsrEa(op); // +
- if (op==0xffff)
- {
- SuperEnd();
- }
- }
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