[picodrive.git] / cpu / Cyclone / Ea.cpp

\r
#include "app.h"\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) needor=1; // Need to OR to access A0-7\r
\r
  if (((mask&g_op)>>low)&8) needor=0; // Ah - no we don't actually need to or, since the bit is high in r8\r
\r
  if (forceor) needor=1; // Special case for 0x30-0x38 EAs ;)\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,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); // Fetch\r
  else                      MemHandler(0,size,a); // Read\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); // Call write handler\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
Commit	Line	Data
cc68a136	1	\r
	2	#include "app.h"\r
	3	\r
	4	// some ops use non-standard cycle counts for EAs, so are listed here.\r
	5	// all constants borrowed from the MUSASHI core by Karl Stenerud.\r
	6	\r
	7	/* Extra cycles for JMP instruction (000, 010) */\r
	8	int g_jmp_cycle_table[8] =\r
	9	{\r
	10	4, /* EA_MODE_AI */\r
	11	6, /* EA_MODE_DI */\r
	12	10, /* EA_MODE_IX */\r
	13	6, /* EA_MODE_AW */\r
	14	8, /* EA_MODE_AL */\r
	15	6, /* EA_MODE_PCDI */\r
	16	10, /* EA_MODE_PCIX */\r
	17	0, /* EA_MODE_I */\r
	18	};\r
	19	\r
	20	/* Extra cycles for JSR instruction (000, 010) */\r
	21	int g_jsr_cycle_table[8] =\r
	22	{\r
	23	4, /* EA_MODE_AI */\r
	24	6, /* EA_MODE_DI */\r
	25	10, /* EA_MODE_IX */\r
	26	6, /* EA_MODE_AW */\r
	27	8, /* EA_MODE_AL */\r
	28	6, /* EA_MODE_PCDI */\r
	29	10, /* EA_MODE_PCIX */\r
	30	0, /* EA_MODE_I */\r
	31	};\r
	32	\r
	33	/* Extra cycles for LEA instruction (000, 010) */\r
	34	int g_lea_cycle_table[8] =\r
	35	{\r
	36	4, /* EA_MODE_AI */\r
	37	8, /* EA_MODE_DI */\r
	38	12, /* EA_MODE_IX */\r
	39	8, /* EA_MODE_AW */\r
	40	12, /* EA_MODE_AL */\r
	41	8, /* EA_MODE_PCDI */\r
	42	12, /* EA_MODE_PCIX */\r
	43	0, /* EA_MODE_I */\r
	44	};\r
	45	\r
	46	/* Extra cycles for PEA instruction (000, 010) */\r
	47	int g_pea_cycle_table[8] =\r
	48	{\r
	49	6, /* EA_MODE_AI */\r
	50	10, /* EA_MODE_DI */\r
	51	14, /* EA_MODE_IX */\r
	52	10, /* EA_MODE_AW */\r
	53	14, /* EA_MODE_AL */\r
	54	10, /* EA_MODE_PCDI */\r
	55	14, /* EA_MODE_PCIX */\r
	56	0, /* EA_MODE_I */\r
	57	};\r
	58	\r
	59	/* Extra cycles for MOVEM instruction (000, 010) */\r
	60	int g_movem_cycle_table[8] =\r
	61	{\r
	62	0, /* EA_MODE_AI */\r
	63	4, /* EA_MODE_DI */\r
	64	6, /* EA_MODE_IX */\r
65	4, /* EA_MODE_AW */\r
66	8, /* EA_MODE_AL */\r
67	0, /* EA_MODE_PCDI */\r
68	0, /* EA_MODE_PCIX */\r
69	0, /* EA_MODE_I */\r
70	};\r
71	\r
72	// add nonstandard EA\r
73	int Ea_add_ns(int *tab, int ea)\r
74	{\r
a6785576	75	if(ea<0x10) return 0;\r
	76	if((ea&0x38)==0x10) return tab[0]; // (An) (ai)\r
	77	if(ea<0x28) return 0;\r
	78	if(ea<0x30) return tab[1]; // ($nn,An) (di)\r
	79	if(ea<0x38) return tab[2]; // ($nn,An,Rn) (ix)\r
	80	if(ea==0x38) return tab[3]; // (aw)\r
	81	if(ea==0x39) return tab[4]; // (al)\r
	82	if(ea==0x3a) return tab[5]; // ($nn,PC) (pcdi)\r
	83	if(ea==0x3b) return tab[6]; // ($nn,pc,Rn) (pcix)\r
	84	if(ea==0x3c) return tab[7]; // #$nnnn (i)\r
	85	return 0;\r
cc68a136	86	}\r
	87	\r
	88	\r
	89	// ---------------------------------------------------------------------------\r
	90	// Gets the offset of a register for an ea, and puts it in 'r'\r
	91	// Shifted left by 'shift'\r
	92	// Doesn't trash anything\r
	93	static int EaCalcReg(int r,int ea,int mask,int forceor,int shift,int noshift=0)\r
	94	{\r
	95	int i=0,low=0,needor=0;\r
	96	int lsl=0;\r
	97	\r
	98	for (i=mask\|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is\r
	99	mask&=0xf<<low; // This is the max we can do\r
	100	\r
	101	if (ea>=8) needor=1; // Need to OR to access A0-7\r
	102	\r
85a36a57	103	if (((mask&g_op)>>low)&8) needor=0; // Ah - no we don't actually need to or, since the bit is high in r8\r
cc68a136	104	\r
	105	if (forceor) needor=1; // Special case for 0x30-0x38 EAs ;)\r
	106	\r
	107	ot(" and r%d,r8,#0x%.4x\n",r,mask);\r
	108	if (needor) ot(" orr r%d,r%d,#0x%x ;@ A0-7\n",r,r,8<<low);\r
	109	\r
	110	// Find out amount to shift left:\r
	111	lsl=shift-low;\r
	112	\r
	113	if (lsl&&!noshift)\r
	114	{\r
	115	ot(" mov r%d,r%d,",r,r);\r
	116	if (lsl>0) ot("lsl #%d\n", lsl);\r
	117	else ot("lsr #%d\n",-lsl);\r
	118	}\r
	119	\r
	120	return 0;\r
	121	}\r
	122	\r
	123	// EaCalc - ARM Register 'a' = Effective Address\r
85a36a57	124	// If ea>=0x10, trashes r0,r2 and r3, else nothing\r
cc68a136	125	// size values 0, 1, 2 ~ byte, word, long\r
85a36a57	126	// mask shows usable bits in r8\r
b637c56a	127	int EaCalc(int a,int mask,int ea,int size,int top,int sign_extend)\r
cc68a136	128	{\r
	129	char text[32]="";\r
	130	int func=0;\r
	131	\r
	132	DisaPc=2; DisaGetEa(text,ea,size); // Get text version of the effective address\r
	133	func=0x68+(size<<2); // Get correct read handler\r
	134	\r
	135	if (ea<0x10)\r
	136	{\r
	137	int noshift=0;\r
b637c56a	138	if (size>=2\|\|(size==0&&(top\|\|!sign_extend))) noshift=1; // Saves one opcode\r
cc68a136	139	\r
	140	ot(";@ EaCalc : Get register index into r%d:\n",a);\r
	141	\r
	142	EaCalcReg(a,ea,mask,0,2,noshift);\r
	143	return 0;\r
	144	}\r
	145	\r
	146	ot(";@ EaCalc : Get '%s' into r%d:\n",text,a);\r
	147	// (An), (An)+, -(An)\r
	148	if (ea<0x28)\r
	149	{\r
	150	int step=1<<size, strr=a;\r
a6785576	151	int low=0,lsl,i;\r
cc68a136	152	\r
	153	if ((ea&7)==7 && step<2) step=2; // move.b (a7)+ or -(a7) steps by 2 not 1\r
	154	\r
85a36a57	155	if (ea==0x1f\|\|ea==0x27) // A7 handlers are always separate\r
	156	{\r
	157	ot(" ldr r%d,[r7,#0x3c] ;@ A7\n",a);\r
	158	}\r
	159	else\r
	160	{\r
	161	EaCalcReg(2,ea,mask,0,0,1);\r
	162	if(mask)\r
	163	for (i=mask\|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is\r
	164	lsl=2-low; // Having a lsl #x here saves one opcode\r
	165	if (lsl>=0) ot(" ldr r%d,[r7,r2,lsl #%i]\n",a,lsl);\r
	166	else if (lsl<0) ot(" ldr r%d,[r7,r2,lsr #%i]\n",a,-lsl);\r
	167	}\r
cc68a136	168	\r
cc68a136	169	if ((ea&0x38)==0x18) // (An)+\r
a6785576	170	{\r
cc68a136	171	ot(" add r3,r%d,#%d ;@ Post-increment An\n",a,step);\r
a6785576	172	strr=3;\r
a6785576	173	}\r
cc68a136	174	\r
	175	if ((ea&0x38)==0x20) // -(An)\r
	176	ot(" sub r%d,r%d,#%d ;@ Pre-decrement An\n",a,a,step);\r
	177	\r
	178	if ((ea&0x38)==0x18\|\|(ea&0x38)==0x20)\r
a6785576	179	{\r
85a36a57	180	if (ea==0x1f\|\|ea==0x27)\r
	181	{\r
	182	ot(" str r%d,[r7,#0x3c] ;@ A7\n",strr);\r
	183	}\r
	184	else\r
	185	{\r
	186	if (lsl>=0) ot(" str r%d,[r7,r2,lsl #%i]\n",strr,lsl);\r
	187	else if (lsl<0) ot(" str r%d,[r7,r2,lsr #%i]\n",strr,-lsl);\r
	188	}\r
cc68a136	189	}\r
	190	\r
	191	if ((ea&0x38)==0x20) Cycles+=size<2 ? 6:10; // -(An) Extra cycles\r
	192	else Cycles+=size<2 ? 4:8; // (An),(An)+ Extra cycles\r
	193	return 0;\r
	194	}\r
	195	\r
	196	if (ea<0x30) // ($nn,An) (di)\r
	197	{\r
cfb3dfa0	198	ot(" ldrsh r0,[r4],#2 ;@ Fetch offset\n"); pc_dirty=1;\r
b637c56a	199	EaCalcReg(2,8,mask,0,0);\r
cc68a136	200	ot(" ldr r2,[r7,r2,lsl #2]\n");\r
	201	ot(" add r%d,r0,r2 ;@ Add on offset\n",a);\r
	202	Cycles+=size<2 ? 8:12; // Extra cycles\r
	203	return 0;\r
	204	}\r
	205	\r
	206	if (ea<0x38) // ($nn,An,Rn) (ix)\r
	207	{\r
	208	ot(";@ Get extension word into r3:\n");\r
cfb3dfa0	209	ot(" ldrh r3,[r4],#2 ;@ ($Disp,PC,Rn)\n"); pc_dirty=1;\r
cc68a136	210	ot(" mov r2,r3,lsr #10\n");\r
	211	ot(" tst r3,#0x0800 ;@ Is Rn Word or Long\n");\r
	212	ot(" and r2,r2,#0x3c ;@ r2=Index of Rn\n");\r
	213	ot(" ldreqsh r2,[r7,r2] ;@ r2=Rn.w\n");\r
	214	ot(" ldrne r2,[r7,r2] ;@ r2=Rn.l\n");\r
	215	ot(" mov r0,r3,asl #24 ;@ r0=Get 8-bit signed Disp\n");\r
	216	ot(" add r3,r2,r0,asr #24 ;@ r3=Disp+Rn\n");\r
	217	\r
	218	EaCalcReg(2,8,mask,1,0);\r
	219	ot(" ldr r2,[r7,r2,lsl #2]\n");\r
	220	ot(" add r%d,r2,r3 ;@ r%d=Disp+An+Rn\n",a,a);\r
	221	Cycles+=size<2 ? 10:14; // Extra cycles\r
	222	return 0;\r
	223	}\r
	224	\r
	225	if (ea==0x38) // (aw)\r
	226	{\r
cfb3dfa0	227	ot(" ldrsh r%d,[r4],#2 ;@ Fetch Absolute Short address\n",a); pc_dirty=1;\r
cc68a136	228	Cycles+=size<2 ? 8:12; // Extra cycles\r
	229	return 0;\r
	230	}\r
	231	\r
	232	if (ea==0x39) // (al)\r
	233	{\r
	234	ot(" ldrh r2,[r4],#2 ;@ Fetch Absolute Long address\n");\r
cfb3dfa0	235	ot(" ldrh r0,[r4],#2\n"); pc_dirty=1;\r
cc68a136	236	ot(" orr r%d,r0,r2,lsl #16\n",a);\r
	237	Cycles+=size<2 ? 12:16; // Extra cycles\r
	238	return 0;\r
	239	}\r
	240	\r
	241	if (ea==0x3a) // ($nn,PC) (pcdi)\r
	242	{\r
	243	ot(" ldr r0,[r7,#0x60] ;@ Get Memory base\n");\r
	244	ot(" sub r0,r4,r0 ;@ Real PC\n");\r
cfb3dfa0	245	ot(" ldrsh r2,[r4],#2 ;@ Fetch extension\n"); pc_dirty=1;\r
cc68a136	246	ot(" mov r0,r0,lsl #8\n");\r
	247	ot(" add r%d,r2,r0,asr #8 ;@ ($nn,PC)\n",a);\r
	248	Cycles+=size<2 ? 8:12; // Extra cycles\r
	249	return 0;\r
	250	}\r
	251	\r
	252	if (ea==0x3b) // ($nn,pc,Rn) (pcix)\r
	253	{\r
	254	ot(" ldr r0,[r7,#0x60] ;@ Get Memory base\n");\r
	255	ot(" ldrh r3,[r4] ;@ Get extension word\n");\r
	256	ot(" sub r0,r4,r0 ;@ r0=PC\n");\r
cfb3dfa0	257	ot(" add r4,r4,#2\n"); pc_dirty=1;\r
cc68a136	258	ot(" mov r0,r0,asl #8 ;@ use only 24bits of PC\n");\r
	259	ot(" mov r2,r3,lsr #10\n");\r
	260	ot(" tst r3,#0x0800 ;@ Is Rn Word or Long\n");\r
	261	ot(" and r2,r2,#0x3c ;@ r2=Index of Rn\n");\r
	262	ot(" ldreqsh r2,[r7,r2] ;@ r2=Rn.w\n");\r
	263	ot(" ldrne r2,[r7,r2] ;@ r2=Rn.l\n");\r
	264	ot(" mov r3,r3,asl #24 ;@ r3=Get 8-bit signed Disp\n");\r
	265	ot(" add r2,r2,r3,asr #24 ;@ r2=Disp+Rn\n");\r
	266	ot(" add r%d,r2,r0,asr #8 ;@ r%d=Disp+PC+Rn\n",a,a);\r
	267	Cycles+=size<2 ? 10:14; // Extra cycles\r
	268	return 0;\r
	269	}\r
	270	\r
	271	if (ea==0x3c) // #$nnnn (i)\r
	272	{\r
	273	if (size<2)\r
	274	{\r
cfb3dfa0	275	ot(" ldr%s r%d,[r4],#2 ;@ Fetch immediate value\n",Sarm[size&3],a); pc_dirty=1;\r
cc68a136	276	Cycles+=4; // Extra cycles\r
	277	return 0;\r
	278	}\r
	279	\r
	280	ot(" ldrh r2,[r4],#2 ;@ Fetch immediate value\n");\r
85a36a57	281	ot(" ldrh r3,[r4],#2\n"); pc_dirty=1;\r
85a36a57	282	ot(" orr r%d,r3,r2,lsl #16\n",a);\r
cc68a136	283	Cycles+=8; // Extra cycles\r
	284	return 0;\r
	285	}\r
	286	\r
	287	return 1;\r
	288	}\r
	289	\r
	290	// ---------------------------------------------------------------------------\r
	291	// Read effective address in (ARM Register 'a') to ARM register 'v'\r
	292	// 'a' and 'v' can be anything but 0 is generally best (for both)\r
	293	// If (ea<0x10) nothing is trashed, else r0-r3 is trashed\r
	294	// If 'top' is given, the ARM register v shifted to the top, e.g. 0xc000 -> 0xc0000000\r
b637c56a	295	// If top is 0 and sign_extend is not, then ARM register v is sign extended,\r
b637c56a	296	// e.g. 0xc000 -> 0xffffc000 (else it may or may not be sign extended)\r
cc68a136	297	\r
b637c56a	298	int EaRead(int a,int v,int ea,int size,int mask,int top,int sign_extend)\r
cc68a136	299	{\r
	300	char text[32]="";\r
	301	int shift=0;\r
3a5e6cf8	302	\r
cc68a136	303	shift=32-(8<<size);\r
	304	\r
	305	DisaPc=2; DisaGetEa(text,ea,size); // Get text version of the effective address\r
	306	\r
	307	if (ea<0x10)\r
	308	{\r
3a5e6cf8	309	int lsl=0,low=0,nsarm=size&3,i;\r
b637c56a	310	if (size>=2\|\|(size==0&&(top\|\|!sign_extend))) {\r
a6785576	311	if(mask)\r
cc68a136	312	for (i=mask\|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is\r
a6785576	313	lsl=2-low; // Having a lsl #2 here saves one opcode\r
a6785576	314	}\r
cc68a136	315	\r
85a36a57	316	if (top\|\|!sign_extend) nsarm=3;\r
3a5e6cf8	317	\r
cc68a136	318	ot(";@ EaRead : Read register[r%d] into r%d:\n",a,v);\r
cc68a136	319	\r
3a5e6cf8	320	if (lsl>0) ot(" ldr%s r%d,[r7,r%d,lsl #%i]\n",Narm[nsarm],v,a,lsl);\r
	321	else if (lsl<0) ot(" ldr%s r%d,[r7,r%d,lsr #%i]\n",Narm[nsarm],v,a,-lsl);\r
	322	else ot(" ldr%s r%d,[r7,r%d]\n",Sarm[nsarm],v,a);\r
cc68a136	323	\r
3a5e6cf8	324	if (top&&shift) ot(" mov r%d,r%d,asl #%d\n",v,v,shift);\r
cc68a136	325	\r
	326	ot("\n"); return 0;\r
	327	}\r
	328	\r
	329	ot(";@ EaRead : Read '%s' (address in r%d) into r%d:\n",text,a,v);\r
	330	\r
	331	if (ea==0x3c)\r
	332	{\r
	333	int asl=0;\r
	334	\r
	335	if (top) asl=shift;\r
	336	\r
b637c56a	337	if (asl) ot(" mov r%d,r%d,asl #%d\n",v,a,asl);\r
b637c56a	338	else if (v!=a) ot(" mov r%d,r%d\n",v,a);\r
cc68a136	339	ot("\n"); return 0;\r
	340	}\r
	341	\r
cfb3dfa0	342	if (ea>=0x3a && ea<=0x3b) MemHandler(2,size,a); // Fetch\r
cfb3dfa0	343	else MemHandler(0,size,a); // Read\r
cc68a136	344	\r
b637c56a	345	if (sign_extend)\r
	346	{\r
	347	int d_reg=0;\r
	348	if (shift) {\r
	349	ot(" mov r%d,r%d,asl #%d\n",v,d_reg,shift);\r
	350	d_reg=v;\r
	351	}\r
	352	if (!top && shift) {\r
	353	ot(" mov r%d,r%d,asr #%d\n",v,d_reg,shift);\r
	354	d_reg=v;\r
	355	}\r
	356	if (d_reg != v)\r
	357	ot(" mov r%d,r%d\n",v,d_reg);\r
	358	}\r
	359	else\r
	360	{\r
	361	if (top && shift)\r
	362	ot(" mov r%d,r0,asl #%d\n",v,shift);\r
	363	else if (v!=0)\r
	364	ot(" mov r%d,r0\n",v);\r
cc68a136	365	}\r
cc68a136	366	\r
	367	ot("\n"); return 0;\r
	368	}\r
	369	\r
85a36a57	370	// calculate EA and read\r
	371	// if (ea < 0x10) nothing is trashed\r
	372	// if (ea == 0x3c) r2 and r3 are trashed\r
	373	// else r0-r3 are trashed\r
	374	// size values 0, 1, 2 ~ byte, word, long\r
	375	// r_ea is reg to store ea in (-1 means ea is not needed), r is dst reg\r
	376	// if sign_extend is 0, non-32bit values will have MS bits undefined\r
	377	int EaCalcRead(int r_ea,int r,int ea,int size,int mask,int sign_extend)\r
	378	{\r
	379	if (ea<0x10)\r
	380	{\r
	381	if (r_ea==-1)\r
	382	{\r
	383	r_ea=r;\r
	384	if (!sign_extend) size=2;\r
	385	}\r
	386	}\r
	387	else if (ea==0x3c) // #imm\r
	388	{\r
	389	r_ea=r;\r
	390	}\r
	391	else\r
	392	{\r
	393	if (r_ea==-1) r_ea=0;\r
	394	}\r
	395	\r
	396	EaCalc (r_ea,mask,ea,size,0,sign_extend);\r
	397	EaRead (r_ea, r,ea,size,mask,0,sign_extend);\r
	398	\r
	399	return 0;\r
	400	}\r
	401	\r
	402	int EaCalcReadNoSE(int r_ea,int r,int ea,int size,int mask)\r
	403	{\r
	404	return EaCalcRead(r_ea,r,ea,size,mask,0);\r
	405	}\r
	406	\r
cc68a136	407	// Return 1 if we can read this ea\r
	408	int EaCanRead(int ea,int size)\r
	409	{\r
	410	if (size<0)\r
	411	{\r
	412	// LEA:\r
	413	// These don't make sense?:\r
	414	if (ea< 0x10) return 0; // Register\r
	415	if (ea==0x3c) return 0; // Immediate\r
	416	if (ea>=0x18 && ea<0x28) return 0; // Pre/Post inc/dec An\r
	417	}\r
	418	\r
	419	if (ea<=0x3c) return 1;\r
	420	return 0;\r
	421	}\r
	422	\r
	423	// ---------------------------------------------------------------------------\r
	424	// Write effective address (ARM Register 'a') with ARM register 'v'\r
	425	// Trashes r0-r3,r12,lr; 'a' can be 0 or 2+, 'v' can be 1 or higher\r
	426	// If a==0 and v==1 it's faster though.\r
b637c56a	427	int EaWrite(int a,int v,int ea,int size,int mask,int top,int sign_extend_ea)\r
cc68a136	428	{\r
	429	char text[32]="";\r
	430	int shift=0;\r
	431	\r
	432	if(a == 1) { printf("Error! EaWrite a==1 !\n"); return 1; }\r
	433	\r
	434	if (top) shift=32-(8<<size);\r
	435	\r
	436	DisaPc=2; DisaGetEa(text,ea,size); // Get text version of the effective address\r
	437	\r
	438	if (ea<0x10)\r
	439	{\r
	440	int lsl=0,low=0,i;\r
b637c56a	441	if (size>=2\|\|(size==0&&(top\|\|!sign_extend_ea))) {\r
a6785576	442	if(mask)\r
cc68a136	443	for (i=mask\|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is\r
a6785576	444	lsl=2-low; // Having a lsl #x here saves one opcode\r
a6785576	445	}\r
cc68a136	446	\r
	447	ot(";@ EaWrite: r%d into register[r%d]:\n",v,a);\r
	448	if (shift) ot(" mov r%d,r%d,asr #%d\n",v,v,shift);\r
	449	\r
	450	if (lsl>0) ot(" str%s r%d,[r7,r%d,lsl #%i]\n",Narm[size&3],v,a,lsl);\r
	451	else if (lsl<0) ot(" str%s r%d,[r7,r%d,lsr #%i]\n",Narm[size&3],v,a,-lsl);\r
	452	else ot(" str%s r%d,[r7,r%d]\n",Narm[size&3],v,a);\r
	453	\r
	454	ot("\n"); return 0;\r
	455	}\r
	456	\r
	457	ot(";@ EaWrite: Write r%d into '%s' (address in r%d):\n",v,text,a);\r
	458	\r
	459	if (ea==0x3c) { ot("Error! Write EA=0x%x\n\n",ea); return 1; }\r
	460	\r
b637c56a	461	if (shift) ot(" mov r1,r%d,asr #%d\n",v,shift);\r
b637c56a	462	else if (v!=1) ot(" mov r1,r%d\n",v);\r
cc68a136	463	\r
cfb3dfa0	464	MemHandler(1,size,a); // Call write handler\r
cc68a136	465	\r
	466	ot("\n"); return 0;\r
	467	}\r
	468	\r
	469	// Return 1 if we can write this ea\r
	470	int EaCanWrite(int ea)\r
	471	{\r
	472	if (ea<=0x39) return 1; // 3b?\r
	473	return 0;\r
	474	}\r
	475	// ---------------------------------------------------------------------------\r
	476	\r
	477	// Return 1 if EA is An reg\r
	478	int EaAn(int ea)\r
	479	{\r
	480	if((ea&0x38)==8) return 1;\r
	481	return 0;\r
	482	}\r
	483	\r