X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=OpMove.cpp;fp=OpMove.cpp;h=1e24566d2b5e5e85b6a838f367f5a286c3a760b1;hb=52ac6b1c8f65fe2477ffc3a7fc63ca8ae9d7e59f;hp=0000000000000000000000000000000000000000;hpb=d9d77995ec88700f438b3638df179a014bf4f6b3;p=cyclone68000.git

diff --git a/OpMove.cpp b/OpMove.cpp
new file mode 100644
index 0000000..1e24566
--- /dev/null
+++ b/OpMove.cpp
@@ -0,0 +1,695 @@
+
+// This file is part of the Cyclone 68000 Emulator
+
+// Copyright (c) 2004,2011 FinalDave (emudave (at) gmail.com)
+// Copyright (c) 2005-2011 Gražvydas "notaz" Ignotas (notasas (at) gmail.com)
+
+// This code is licensed under the GNU General Public License version 2.0 and the MAME License.
+// You can choose the license that has the most advantages for you.
+
+// SVN repository can be found at http://code.google.com/p/cyclone68000/
+
+
+#include "app.h"
+
+// Pack our flags into r1, in SR/CCR register format
+// trashes r0,r2
+void OpFlagsToReg(int high)
+{
+  ot("  ldr r0,[r7,#0x4c]   ;@ X bit\n");
+  ot("  mov r1,r10,lsr #28  ;@ ____NZCV\n");
+  ot("  eor r2,r1,r1,ror #1 ;@ Bit 0=C^V\n");
+  ot("  tst r2,#1           ;@ 1 if C!=V\n");
+  ot("  eorne r1,r1,#3      ;@ ____NZVC\n");
+  ot("\n");
+  if (high) ot("  ldrb r2,[r7,#0x44]  ;@ Include SR high\n");
+  ot("  and r0,r0,#0x20000000\n");
+  ot("  orr r1,r1,r0,lsr #25 ;@ ___XNZVC\n");
+  if (high) ot("  orr r1,r1,r2,lsl #8\n");
+  ot("\n");
+}
+
+// Convert SR/CRR register in r0 to our flags
+// trashes r0,r1
+void OpRegToFlags(int high, int srh_reg)
+{
+  ot("  eor r1,r0,r0,ror #1 ;@ Bit 0=C^V\n");
+  ot("  mov r2,r0,lsl #25\n");
+  ot("  tst r1,#1           ;@ 1 if C!=V\n");
+  ot("  eorne r0,r0,#3      ;@ ___XNZCV\n");
+  ot("  str r2,[r7,#0x4c]   ;@ Store X bit\n");
+  ot("  mov r10,r0,lsl #28  ;@ r10=NZCV...\n");
+
+  if (high)
+  {
+    int mask=EMULATE_TRACE?0xa7:0x27;
+    ot("  mov r%i,r0,ror #8\n",srh_reg);
+    ot("  and r%i,r%i,#0x%02x ;@ only take defined bits\n",srh_reg,srh_reg,mask);
+    ot("  strb r%i,[r7,#0x44] ;@ Store SR high\n",srh_reg);
+  }
+  ot("\n");
+}
+
+void SuperEnd(void)
+{
+  ot(";@ ----------\n");
+  ot(";@ tried execute privileged instruction in user mode\n");
+  ot("WrongPrivilegeMode%s\n",ms?"":":");
+#if EMULATE_ADDRESS_ERRORS_JUMP || EMULATE_ADDRESS_ERRORS_IO
+  ot("  ldr r1,[r7,#0x58]\n");
+  ot("  sub r4,r4,#2 ;@ last opcode wasn't executed - go back\n");
+  ot("  orr r1,r1,#4 ;@ set activity bit: 'not processing instruction'\n");
+  ot("  str r1,[r7,#0x58]\n");
+#else
+  ot("  sub r4,r4,#2 ;@ last opcode wasn't executed - go back\n");
+#endif
+  ot("  mov r0,#8 ;@ privilege violation\n");
+  ot("  bl Exception\n");
+  Cycles=34;
+  OpEnd(0);
+}
+
+// does OSP and A7 swapping if needed
+// new or old SR (not the one already in [r7,#0x44]) should be passed in r11
+// uses srh from srh_reg (loads if < 0), trashes r0,r11
+void SuperChange(int op,int srh_reg)
+{
+  ot(";@ A7 <-> OSP?\n");
+  if (srh_reg < 0) {
+    ot("  ldr r0,[r7,#0x44] ;@ Get other SR high\n");
+    srh_reg=0;
+  }
+  ot("  eor r0,r%i,r11\n",srh_reg);
+  ot("  tst r0,#0x20\n");
+  ot("  beq no_sp_swap%.4x\n",op);
+  ot(" ;@ swap OSP and A7:\n");
+  ot("  ldr r11,[r7,#0x3C] ;@ Get A7\n");
+  ot("  ldr r0, [r7,#0x48] ;@ Get OSP\n");
+  ot("  str r11,[r7,#0x48]\n");
+  ot("  str r0, [r7,#0x3C]\n");
+  ot("no_sp_swap%.4x%s\n", op, ms?"":":");
+}
+
+
+
+// --------------------- Opcodes 0x1000+ ---------------------
+// Emit a Move opcode, 00xxdddd ddssssss
+int OpMove(int op)
+{
+  int sea=0,tea=0;
+  int size=0,use=0;
+  int movea=0;
+
+  // Get source and target EA
+  sea = op&0x003f;
+  tea =(op&0x01c0)>>3;
+  tea|=(op&0x0e00)>>9;
+
+  if (tea>=8 && tea<0x10) movea=1;
+
+  // Find size extension
+  switch (op&0x3000)
+  {
+    default: return 1;
+    case 0x1000: size=0; break;
+    case 0x3000: size=1; break;
+    case 0x2000: size=2; break;
+  }
+
+  if (size<1 && (movea || EaAn(sea))) return 1; // move.b An,* and movea.b * are invalid
+
+  // See if we can do this opcode:
+  if (EaCanRead (sea,size)==0) return 1;
+  if (EaCanWrite(tea     )==0) return 1;
+
+  use=OpBase(op,size);
+  if (tea<0x38) use&=~0x0e00; // Use same handler for register ?0-7
+  
+  if (tea==0x1f || tea==0x27) use|=0x0e00; // Specific handler for (a7)+ and -(a7)
+
+  if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
+
+  OpStart(op,sea,tea); Cycles=4;
+
+  if (movea==0)
+  {
+    EaCalcRead(-1,0,sea,size,0x003f);
+    ot("  adds r1,r0,#0 ;@ Defines NZ, clears CV\n");
+    ot("  mrs r10,cpsr ;@ r10=NZCV flags\n");
+    ot("\n");
+  }
+  else
+  {
+    EaCalcRead(-1,1,sea,size,0x003f);
+    size=2; // movea always expands to 32-bits
+  }
+
+  eawrite_check_addrerr=1;
+#if SPLIT_MOVEL_PD
+  if ((tea&0x38)==0x20 && size==2) { // -(An)
+    EaCalc (8,0x0e00,tea,size,0,0);
+    ot("  mov r11,r1\n");
+    ot("  add r0,r8,#2\n");
+    EaWrite(0,     1,tea,1,0x0e00,0,0);
+    EaWrite(8,    11,tea,1,0x0e00,1);
+  }
+  else
+#endif
+  {
+    EaCalc (0,0x0e00,tea,size,0,0);
+    EaWrite(0,     1,tea,size,0x0e00,0,0);
+  }
+
+#if CYCLONE_FOR_GENESIS && !MEMHANDLERS_CHANGE_CYCLES
+  // this is a bit hacky (device handlers might modify cycles)
+  if (tea==0x39||((0x10<=tea&&tea<0x30)&&size>=1))
+    ot("  ldr r5,[r7,#0x5c] ;@ Load Cycles\n");
+#endif
+
+  if((tea&0x38)==0x20) Cycles-=2; // less cycles when dest is -(An)
+
+  OpEnd(sea,tea);
+  return 0;
+}
+
+// --------------------- Opcodes 0x41c0+ ---------------------
+// Emit an Lea opcode, 0100nnn1 11aaaaaa
+int OpLea(int op)
+{
+  int use=0;
+  int sea=0,tea=0;
+
+  sea= op&0x003f;
+  tea=(op&0x0e00)>>9; tea|=8;
+
+  if (EaCanRead(sea,-1)==0) return 1; // See if we can do this opcode
+
+  use=OpBase(op,0);
+  use&=~0x0e00; // Also use 1 handler for target ?0-7
+  if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
+
+  OpStart(op,sea,tea);
+
+  eawrite_check_addrerr=1;
+  EaCalc (1,0x003f,sea,0); // Lea
+  EaCalc (0,0x0e00,tea,2);
+  EaWrite(0,     1,tea,2,0x0e00);
+
+  Cycles=Ea_add_ns(g_lea_cycle_table,sea);
+
+  OpEnd(sea,tea);
+
+  return 0;
+}
+
+// --------------------- Opcodes 0x40c0+ ---------------------
+// Move SR opcode, 01000tt0 11aaaaaa move SR
+int OpMoveSr(int op)
+{
+  int type=0,ea=0;
+  int use=0,size=1;
+
+  type=(op>>9)&3; // from SR, from CCR, to CCR, to SR
+  ea=op&0x3f;
+
+  if(EaAn(ea)) return 1; // can't use An regs
+
+  switch(type)
+  {
+    case 0:
+      if (EaCanWrite(ea)==0) return 1; // See if we can do this opcode:
+      break;
+
+    case 1:
+      return 1; // no such op in 68000
+
+    case 2: case 3:
+      if (EaCanRead(ea,size)==0) return 1; // See if we can do this opcode:
+      break;
+  }
+
+  use=OpBase(op,size);
+  if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
+
+  // 68000 model allows reading whole SR in user mode (but newer models don't)
+  OpStart(op,ea,0,0,type==3);
+  Cycles=12;
+  if (type==0) Cycles=(ea>=8)?8:6;
+
+  if (type==0 || type==1)
+  {
+    eawrite_check_addrerr=1;
+    OpFlagsToReg(type==0);
+    EaCalc (0,0x003f,ea,size,0,0);
+    EaWrite(0,     1,ea,size,0x003f,0,0);
+  }
+
+  if (type==2 || type==3)
+  {
+    EaCalcReadNoSE(-1,0,ea,size,0x003f);
+    OpRegToFlags(type==3,1);
+    if (type==3) {
+      SuperChange(op,1);
+      opend_check_interrupt = 1;
+      opend_check_trace = 1;
+      OpEnd(ea);
+      return 0;
+    }
+  }
+
+  OpEnd(ea);
+
+  return 0;
+}
+
+
+// Ori/Andi/Eori $nnnn,sr 0000t0t0 01111100
+int OpArithSr(int op)
+{
+  int type=0,ea=0;
+  int use=0,size=0;
+  int sr_mask=EMULATE_TRACE?0xa7:0x27;
+
+  type=(op>>9)&5; if (type==4) return 1;
+  size=(op>>6)&1; // ccr or sr?
+  ea=0x3c;
+
+  use=OpBase(op,size);
+  if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
+
+  OpStart(op,ea,0,0,size!=0); Cycles=16;
+
+  EaCalcRead(-1,0,ea,size,0x003f);
+
+  ot("  eor r1,r0,r0,ror #1 ;@ Bit 0=C^V\n");
+  ot("  tst r1,#1           ;@ 1 if C!=V\n");
+  ot("  eorne r0,r0,#3      ;@ ___XNZCV\n");
+  ot("  ldr r2,[r7,#0x4c]   ;@ Load old X bit\n");
+
+  // note: old srh is already in r11 (done by OpStart)
+  if (type==0) {
+    ot("  orr r10,r10,r0,lsl #28\n");
+    ot("  orr r2,r2,r0,lsl #25 ;@ X bit\n");
+    if (size!=0) {
+      ot("  orr r1,r11,r0,lsr #8\n");
+      ot("  and r1,r1,#0x%02x ;@ mask-out unused bits\n",sr_mask);
+    }
+  }
+  if (type==1) {
+    ot("  and r10,r10,r0,lsl #28\n");
+    ot("  and r2,r2,r0,lsl #25 ;@ X bit\n");
+    if (size!=0)
+      ot("  and r1,r11,r0,lsr #8\n");
+  }
+  if (type==5) {
+    ot("  eor r10,r10,r0,lsl #28\n");
+    ot("  eor r2,r2,r0,lsl #25 ;@ X bit\n");
+    if (size!=0) {
+      ot("  eor r1,r11,r0,lsr #8\n");
+      ot("  and r1,r1,#0x%02x ;@ mask-out unused bits\n",sr_mask);
+    }
+  }
+
+  ot("  str r2,[r7,#0x4c]   ;@ Save X bit\n");
+  if (size!=0)
+    ot("  strb r1,[r7,#0x44]\n");
+  ot("\n");
+
+  // we can't enter supervisor mode, nor unmask irqs just by using OR
+  if (size!=0 && type!=0) {
+    SuperChange(op,1);
+    ot("\n");
+    opend_check_interrupt = 1;
+  }
+  // also can't set trace bit with AND
+  if (size!=0 && type!=1)
+    opend_check_trace = 1;
+
+  OpEnd(ea);
+
+  return 0;
+}
+
+// --------------------- Opcodes 0x4850+ ---------------------
+// Emit an Pea opcode, 01001000 01aaaaaa
+int OpPea(int op)
+{
+  int use=0;
+  int ea=0;
+
+  ea=op&0x003f; if (ea<0x10) return 1; // Swap opcode
+  if (EaCanRead(ea,-1)==0) return 1; // See if we can do this opcode:
+
+  use=OpBase(op,0);
+  if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
+
+  OpStart(op,ea);
+
+  ot("  ldr r11,[r7,#0x3c]\n");
+  EaCalc (1,0x003f, ea,0);
+  ot("\n");
+  ot("  sub r0,r11,#4 ;@ Predecrement A7\n");
+  ot("  str r0,[r7,#0x3c] ;@ Save A7\n");
+  ot("\n");
+  MemHandler(1,2); // Write 32-bit
+  ot("\n");
+
+  Cycles=6+Ea_add_ns(g_pea_cycle_table,ea);
+
+  OpEnd(ea);
+
+  return 0;
+}
+
+// --------------------- Opcodes 0x4880+ ---------------------
+// Emit a Movem opcode, 01001d00 1xeeeeee regmask
+int OpMovem(int op)
+{
+  int size=0,ea=0,cea=0,dir=0;
+  int use=0,decr=0,change=0;
+
+  size=((op>>6)&1)+1; // word, long
+  ea=op&0x003f;
+  dir=(op>>10)&1; // Direction (1==ea2reg)
+
+  if (dir) {
+    if (ea<0x10 || ea>0x3b || (ea&0x38)==0x20) return 1; // Invalid EA
+  } else {
+    if (ea<0x10 || ea>0x39 || (ea&0x38)==0x18) return 1;
+  }
+
+  if ((ea&0x38)==0x18 || (ea&0x38)==0x20) change=1;
+  if ((ea&0x38)==0x20) decr=1; // -(An), bitfield is decr
+
+  cea=ea; if (change) cea=0x10;
+
+  use=OpBase(op,size);
+  if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
+
+  OpStart(op,ea,0,1);
+
+  ot("  ldrh r11,[r4],#2 ;@ r11=register mask\n");
+  ot("\n");
+  ot(";@ Get the address into r6:\n");
+  EaCalc(6,0x003f,cea,size);
+
+#if !MEMHANDLERS_NEED_PREV_PC
+  // must save PC, need a spare register
+  ot("  str r4,[r7,#0x40] ;@ Save PC\n");
+#endif
+
+  ot(";@ r4=Register Index*4:\n");
+  if (decr) ot("  mov r4,#0x40 ;@ order reversed for -(An)\n");
+  else      ot("  mov r4,#-4\n");
+  
+  ot("\n");
+  ot("  tst r11,r11\n");        // sanity check
+  ot("  beq NoRegs%.4x\n",op);
+
+#if EMULATE_ADDRESS_ERRORS_IO
+  ot("\n");
+  ot("  tst r6,#1 ;@ address error?\n");
+  ot("  movne r0,r6\n");
+  ot("  bne ExceptionAddressError_%c_data\n",dir?'r':'w');
+#endif
+
+  ot("\n");
+  ot("Movemloop%.4x%s\n",op, ms?"":":");
+  ot("  add r4,r4,#%d ;@ r4=Next Register\n",decr?-4:4);
+  ot("  movs r11,r11,lsr #1\n");
+  ot("  bcc Movemloop%.4x\n",op);
+  ot("\n");
+
+  if (decr) ot("  sub r6,r6,#%d ;@ Pre-decrement address\n",1<<size);
+
+  if (dir)
+  {
+    ot("  ;@ Copy memory to register:\n",1<<size);
+    earead_check_addrerr=0; // already checked
+    EaRead (6,0,ea,size,0x003f);
+    ot("  str r0,[r7,r4] ;@ Save value into Dn/An\n");
+  }
+  else
+  {
+    ot("  ;@ Copy register to memory:\n",1<<size);
+    ot("  ldr r1,[r7,r4] ;@ Load value from Dn/An\n");
+#if SPLIT_MOVEL_PD
+    if (decr && size==2) { // -(An)
+      ot("  add r0,r6,#2\n");
+      EaWrite(0,1,ea,1,0x003f,0,0);
+      ot("  ldr r1,[r7,r4] ;@ Load value from Dn/An\n");
+      ot("  mov r0,r6\n");
+      EaWrite(0,1,ea,1,0x003f,1);
+    }
+    else
+#endif
+    {
+      EaWrite(6,1,ea,size,0x003f);
+    }
+  }
+
+  if (decr==0) ot("  add r6,r6,#%d ;@ Post-increment address\n",1<<size);
+
+  ot("  sub r5,r5,#%d ;@ Take some cycles\n",2<<size);
+  ot("  tst r11,r11\n");
+  ot("  bne Movemloop%.4x\n",op);
+  ot("\n");
+
+  if (change)
+  {
+    ot(";@ Write back address:\n");
+    EaCalc (0,0x0007,8|(ea&7),2);
+    EaWrite(0,     6,8|(ea&7),2,0x0007);
+  }
+
+  ot("NoRegs%.4x%s\n",op, ms?"":":");
+  ot("  ldr r4,[r7,#0x40]\n");
+  ot("  ldr r6,[r7,#0x54] ;@ restore Opcode Jump table\n");
+  ot("\n");
+
+  if(dir) { // er
+         if (ea==0x3a) Cycles=16; // ($nn,PC)
+    else if (ea==0x3b) Cycles=18; // ($nn,pc,Rn)
+    else Cycles=12;
+  } else {
+    Cycles=8;
+  }
+
+  Cycles+=Ea_add_ns(g_movem_cycle_table,ea);
+
+  opend_op_changes_cycles = 1;
+  OpEnd(ea);
+  ot("\n");
+
+  return 0;
+}
+
+// --------------------- Opcodes 0x4e60+ ---------------------
+// Emit a Move USP opcode, 01001110 0110dnnn move An to/from USP
+int OpMoveUsp(int op)
+{
+  int use=0,dir=0;
+
+  dir=(op>>3)&1; // Direction
+  use=op&~0x0007; // Use same opcode for all An
+
+  if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
+
+  OpStart(op,0,0,0,1); Cycles=4;
+
+  if (dir)
+  {
+    eawrite_check_addrerr=1;
+    ot("  ldr r1,[r7,#0x48] ;@ Get from USP\n\n");
+    EaCalc (0,0x000f,8,2,1);
+    EaWrite(0,     1,8,2,0x000f,1);
+  }
+  else
+  {
+    EaCalc (0,0x000f,8,2,1);
+    EaRead (0,     0,8,2,0x000f,1);
+    ot("  str r0,[r7,#0x48] ;@ Put in USP\n\n");
+  }
+    
+  OpEnd();
+
+  return 0;
+}
+
+// --------------------- Opcodes 0x7000+ ---------------------
+// Emit a Move Quick opcode, 0111nnn0 dddddddd  moveq #dd,Dn
+int OpMoveq(int op)
+{
+  int use=0;
+
+  use=op&0xf100; // Use same opcode for all values
+  if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
+
+  OpStart(op); Cycles=4;
+
+  ot("  movs r0,r8,asl #24\n");
+  ot("  and r1,r8,#0x0e00\n");
+  ot("  mov r0,r0,asr #24 ;@ Sign extended Quick value\n");
+  ot("  mrs r10,cpsr ;@ r10=NZ flags\n");
+  ot("  str r0,[r7,r1,lsr #7] ;@ Store into Dn\n");
+  ot("\n");
+
+  OpEnd();
+
+  return 0;
+}
+
+// --------------------- Opcodes 0xc140+ ---------------------
+// Emit a Exchange opcode:
+// 1100ttt1 01000sss  exg ds,dt
+// 1100ttt1 01001sss  exg as,at
+// 1100ttt1 10001sss  exg as,dt
+int OpExg(int op)
+{
+  int use=0,type=0;
+
+  type=op&0xf8;
+
+  if (type!=0x40 && type!=0x48 && type!=0x88) return 1; // Not an exg opcode
+
+  use=op&0xf1f8; // Use same opcode for all values
+  if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
+
+  OpStart(op); Cycles=6;
+
+  ot("  and r2,r8,#0x0e00 ;@ Find T register\n");
+  ot("  and r3,r8,#0x000f ;@ Find S register\n");
+  if (type==0x48) ot("  orr r2,r2,#0x1000 ;@ T is an address register\n");
+  ot("\n");
+  ot("  ldr r0,[r7,r2,lsr #7] ;@ Get T\n");
+  ot("  ldr r1,[r7,r3,lsl #2] ;@ Get S\n");
+  ot("\n");
+  ot("  str r0,[r7,r3,lsl #2] ;@ T->S\n");
+  ot("  str r1,[r7,r2,lsr #7] ;@ S->T\n");  
+  ot("\n");
+
+  OpEnd();
+  
+  return 0;
+}
+
+// ------------------------- movep -------------------------------
+// 0000ddd1 0z001sss
+// 0000sss1 1z001ddd (to mem)
+int OpMovep(int op)
+{
+  int ea=0,rea=0;
+  int size=1,use=0,dir,aadd=0;
+
+  use=op&0xf1f8;
+  if (op!=use) { OpUse(op,use); return 0; } // Use existing handler (for all dests, srcs)
+
+  // Get EA
+  ea = (op&0x0007)|0x28;
+  rea= (op&0x0e00)>>9;
+  dir = (op>>7)&1;
+
+  // Find size extension
+  if(op&0x0040) size=2;
+
+  OpStart(op,ea);
+  
+  if(dir) // reg to mem
+  {
+    EaCalcReadNoSE(-1,11,rea,size,0x0e00);
+
+    EaCalc(8,0x000f,ea,size);
+    if(size==2) { // if operand is long
+      ot("  mov r1,r11,lsr #24 ;@ first byte\n");
+      EaWrite(8,1,ea,0,0x000f); // store first byte
+      ot("  add r0,r8,#%i\n",(aadd+=2));
+      ot("  mov r1,r11,lsr #16 ;@ second byte\n");
+      EaWrite(0,1,ea,0,0x000f); // store second byte
+      ot("  add r0,r8,#%i\n",(aadd+=2));
+    } else {
+      ot("  mov r0,r8\n");
+    }
+    ot("  mov r1,r11,lsr #8 ;@ first or third byte\n");
+    EaWrite(0,1,ea,0,0x000f);
+    ot("  add r0,r8,#%i\n",(aadd+=2));
+    ot("  and r1,r11,#0xff\n");
+    EaWrite(0,1,ea,0,0x000f);
+  }
+  else // mem to reg
+  {
+    EaCalc(6,0x000f,ea,size,1);
+    EaRead(6,11,ea,0,0x000f,1); // read first byte
+    ot("  add r0,r6,#2\n");
+    EaRead(0,1,ea,0,0x000f,1); // read second byte
+    if(size==2) { // if operand is long
+      ot("  orr r11,r11,r1,lsr #8 ;@ second byte\n");
+      ot("  add r0,r6,#4\n");
+      EaRead(0,1,ea,0,0x000f,1);
+      ot("  orr r11,r11,r1,lsr #16 ;@ third byte\n");
+      ot("  add r0,r6,#6\n");
+      EaRead(0,1,ea,0,0x000f,1);
+      ot("  orr r1,r11,r1,lsr #24 ;@ fourth byte\n");
+    } else {
+      ot("  orr r1,r11,r1,lsr #8 ;@ second byte\n");
+    }
+    // store the result
+    EaCalc(0,0x0e00,rea,size,1);
+    EaWrite(0,1,rea,size,0x0e00,1);
+    ot("  ldr r6,[r7,#0x54]\n");
+  }
+
+  Cycles=(size==2)?24:16;
+  OpEnd(ea);
+
+  return 0;
+}
+
+// Emit a Stop/Reset opcodes, 01001110 011100t0 imm
+int OpStopReset(int op)
+{
+  int type=(op>>1)&1; // stop/reset
+
+  OpStart(op,0,0,0,1);
+
+  if(type) {
+    // copy immediate to SR, stop the CPU and eat all remaining cycles.
+    ot("  ldrh r0,[r4],#2 ;@ Fetch the immediate\n");
+    OpRegToFlags(1);
+    SuperChange(op,0);
+
+    ot("\n");
+
+    ot("  ldr r0,[r7,#0x58]\n");
+    ot("  mov r5,#0 ;@ eat cycles\n");
+    ot("  orr r0,r0,#1 ;@ stopped\n");
+    ot("  str r0,[r7,#0x58]\n");
+    ot("\n");
+
+    Cycles = 4;
+    ot("\n");
+  }
+  else
+  {
+    Cycles = 132;
+#if USE_RESET_CALLBACK
+    ot("  str r4,[r7,#0x40] ;@ Save PC\n");
+    ot("  mov r1,r10,lsr #28\n");
+    ot("  strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n");
+    ot("  str r5,[r7,#0x5c] ;@ Save Cycles\n");
+    ot("  ldr r11,[r7,#0x90] ;@ ResetCallback\n");
+    ot("  tst r11,r11\n");
+    ot("  movne lr,pc\n");
+    ot("  bxne r11 ;@ call ResetCallback if it is defined\n");
+    ot("  ldrb r10,[r7,#0x46] ;@ r10 = Load Flags (NZCV)\n");
+    ot("  ldr r5,[r7,#0x5c] ;@ Load Cycles\n");
+    ot("  ldr r4,[r7,#0x40] ;@ Load PC\n");
+    ot("  mov r10,r10,lsl #28\n");
+    ot("\n");
+#endif
+  }
+
+  OpEnd();
+
+  return 0;
+}
+