Version bump for last commit; now at v2.0.23.
[rmac] / parmode.h
index 93852fc5b56d3135321dda47e3015075fae1b928..dd3e1a2b03ee87b6bd58b0a6df3da462ab7bfe2f 100644 (file)
--- a/parmode.h
+++ b/parmode.h
-////////////////////////////////////////////////////////////////////////////////////////////////////
-// RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
+//
+// RMAC - Reboot's Macro Assembler for all Atari computers
 // PARMODE.C - Addressing Modes Parser Include
-// Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends
+// Copyright (C) 199x Landon Dyer, 2011-2020 Reboot and Friends
 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
-// Source Utilised with the Kind Permission of Landon Dyer
+// Source utilised with the kind permission of Landon Dyer
+//
 
-// This file is included (twice) to parse two addressing modes, into slightly different var names
+// This file is included (twice) to parse two addressing modes, into slightly
+// different var names
 {
-   // Dn
-   // An
-   // # expression
-   if((*tok >= KW_D0) && (*tok <= KW_D7)) {
-      AMn = DREG;
-      AnREG = *tok++ & 7;
-   } else if((*tok >= KW_A0) && (*tok <= KW_A7)) {
-      AMn = AREG;
-      AnREG = *tok++ & 7;
-   } else if(*tok == '#') {
-      ++tok;
-      if(expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
-         return(ERROR);
-      AMn = IMMED;
-   }
-   // (An)
-   // (An)+
-   // (An,Xn[.siz][*scale])
-   // (PC,Xn[.siz][*scale])
-   // (d16,An)
-   // (d8,An,Xn[.siz][*scale])
-   // (d16,PC)
-   // (d8,PC,Xn[.siz][*scale])
-   // ([bd,An],Xn,od)
-   // ([bd,An,Xn],od)
-   // ([bd,PC],Xn,od)
-   // ([bd,PC,Xn],od)
-   else if(*tok == '(') {
-      ++tok;
-      if((*tok >= KW_A0) && (*tok <= KW_A7)) {
-         AnREG = *tok++ & 7;
-         if(*tok == ')') {
-            ++tok;
-            if(*tok == '+') {
-               ++tok;
-               AMn = APOSTINC;
-            } else AMn = AIND;
-            goto AnOK;
-         }
-         AMn = AINDEXED;
-         goto AMn_IX0;                                      // Handle ",Xn[.siz][*scale])"
-      } else if(*tok == KW_PC) {                            // (PC,Xn[.siz][*scale]) 
-         ++tok;
-         AMn = PCINDEXED;
-
-         // Common index handler; enter here with `tok' pointing at the comma.
-
-         AMn_IX0:                                           // Handle indexed with missing expr
-
-         AnEXVAL = 0;
-         AnEXATTR = ABS | DEFINED;
-
-         AMn_IXN:                                           // Handle any indexed (tok -> a comma)
-
-         if(*tok++ != ',')
-            goto badmode;
-         if(*tok < KW_D0 || *tok > KW_A7)
-            goto badmode;
-         AnIXREG = *tok++ & 15;
-
-         switch((int)*tok)     {                                // Index reg size: <empty> | .W | .L 
-            case DOTW:
-               ++tok;
-            default:
-               AnIXSIZ = 0;
-               break;
-            case DOTL:
-               AnIXSIZ = 0x0800;
-               ++tok;
-               break;
-            case DOTB:                                      // .B not allowed here...
-               goto badmode;
-         }
-
-         if(*tok == '*') {                                  // scale: *1, *2, *4, *8 
-            ++tok;
-            if(*tok++ != CONST || *tok > 8)
-               goto badmode;
-
-            switch((int)*tok++) {
-               case 1:
-                  break;
-               case 2:
-                  AnIXSIZ |= TIMES2;
-                  break;
-               case 4:
-                  AnIXSIZ |= TIMES4;
-                  break;
-               case 8:
-                  AnIXSIZ |= TIMES8;
-                  break;
-               default:
-                  goto badmode;
-            }
-         }
-
-         if(*tok++ != ')')                                  // final ")" 
-            goto badmode;
-         goto AnOK;
-      } else if(*tok == '[') {                              // ([... 
-         goto unmode;
-      } else {                                              // (expr... 
-         if(expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
-            return ERROR;
-         if(*tok++ != ',')
-            goto badmode;
-
-         if((*tok >= KW_A0) && (*tok <= KW_A7)) {
-            AnREG = *tok & 7;
-            ++tok;
-            if(*tok == ',') {
-               AMn = AINDEXED;
-               goto AMn_IXN;
-            } else if(*tok == ')') {
-               AMn = ADISP;
-               ++tok;
-               goto AnOK;
-            } else goto badmode;
-         } else if(*tok == KW_PC) {
-            if(*++tok == ',') {                             // expr(PC,Xn...)
-               AMn = PCINDEXED;
-               goto AMn_IXN;
-            } else if(*tok == ')') {
-               AMn = PCDISP;                                // expr(PC) 
-               ++tok;
-               goto AnOK;
-            } else goto badmode;
-         } else goto badmode;
-      }
-   } else if(*tok=='-' && tok[1]=='(' && ((tok[2]>=KW_A0) && (tok[2]<=KW_A7)) && tok[3]==')') {
-      AMn = APREDEC;
-      AnREG = tok[2] & 7;
-      tok += 4;
-   } else if(*tok == KW_CCR) {
-      AMn = AM_CCR;
-      ++tok;
-      goto AnOK;
-   } else if(*tok == KW_SR) {
-      AMn = AM_SR;
-      ++tok;
-      goto AnOK;
-   } else if(*tok == KW_USP) {
-      AMn = AM_USP;
-      ++tok;
-      goto AnOK;
-   }
-   // expr
-   // expr.w
-   // expr.l
-   // d16(An)
-   // d8(An,Xn[.siz])
-   // d16(PC)
-   // d8(PC,Xn[.siz])
-   else {
-      if(expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
-         return ERROR;
-
-      if(*tok == DOTW) {                                    // expr.W 
-         ++tok;
-         AMn = ABSW;
-         goto AnOK;
-      } else if(*tok != '(') {                              // expr[.L]
-         AMn = ABSL;
-         // Defined, absolute values from $FFFF8000..$00007FFF get optimized to absolute short
-         if((AnEXATTR & (TDB|DEFINED)) == DEFINED && (AnEXVAL + 0x8000) < 0x10000)
-            AMn = ABSW;
-
-         if(*tok == DOTL) {                                 // force .L 
-            ++tok;
-            AMn = ABSL;
-         }
-         goto AnOK;
-      }
-
-      ++tok;
-      if((*tok >= KW_A0) && (*tok <= KW_A7)) {
-         AnREG = *tok++ & 7;
-         if(*tok == ')') {
-            AMn = ADISP;
-            ++tok;
-            goto AnOK;
-         }
-         AMn = AINDEXED;
-         goto AMn_IXN;
-      } else if(*tok == KW_PC) {
-         if(*++tok == ')') {
-            AMn = PCDISP;
-            ++tok;
-            goto AnOK;
-         }
-         AMn = PCINDEXED;
-         goto AMn_IXN;
-      }
-      goto badmode;
-   }
-
-   // Addressing mode OK
-
-   AnOK:
-   ;
+       uint64_t scaleval;                      // Expression's value
+       TOKEN scaleexpr[EXPRSIZE];      // Expression
+       WORD scaleattr;                         // Expression's attribute
+       SYM * scaleesym;                        // External symbol involved in expr
+
+       // Dn
+       // An
+       // # expression
+       if ((*tok >= KW_D0) && (*tok <= KW_D7))
+       {
+               AMn = DREG;
+               AnREG = *tok++ & 7;
+       }
+       else if ((*tok >= KW_A0) && (*tok <= KW_A7))
+       {
+               AMn = AREG;
+               AnREG = *tok++ & 7;
+       }
+       else if (*tok == '#')
+       {
+               tok++;
+
+               if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
+                       return ERROR;
+
+               AMn = IMMED;
+       }
+
+       // Small problem with this is that the opening parentheses might be an
+       // expression that's part of a displacement; this code will falsely flag
+       // that as an error.
+
+       // (An)
+       // (An)+
+       // (An,Xn[.siz][*scale])
+       // (PC,Xn[.siz][*scale])
+       // (d16,An)
+       // (d8,An,Xn[.siz][*scale])
+       // (d16,PC)
+       // (d8,PC,Xn[.siz][*scale])
+       // ([bd,An],Xn[.siz][*scale],od)
+       // ([bd,An,Xn[.siz][*scale]],od)
+       // ([bd,PC],Xn[.siz][*scale],od)
+       // ([bd,PC,Xn[.siz][*scale]],od)
+       else if (*tok == '(')
+       {
+               int ea_PC = 0;                          // Flag that let us know if we have PC or An relative ea
+               tok++;
+
+               if ((*tok >= KW_A0) && (*tok <= KW_A7))
+               {
+                       AnREG = *tok++ & 7;
+
+                       if (*tok == ')')
+                       {
+                               tok++;
+
+                               if (*tok == '+')
+                               {
+                                       tok++;
+                                       AMn = APOSTINC;
+                               }
+                               else
+                                       AMn = AIND;
+
+                               goto AnOK;
+                       }
+
+                       AMn = AINDEXED;
+                       goto AMn_IX0;            // Handle ",Xn[.siz][*scale])"
+               }
+               else if ((*tok >= KW_D0) && (*tok <= KW_D7))
+               {
+                       // Since index register isn't used here, store register number in this field
+                       AnIXREG = *tok++ & 7;                                // (Dn)
+
+                       if (*tok == ')')
+                       {
+                               tok++;
+                               AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
+                               AnEXTEN |= EXT_BS;          // Base register suppressed
+                               AnEXTEN |= EXT_BDSIZE0;     // Base displacement null
+                               AnEXTEN |= EXT_IISPOSN;     // Indirect Postindexed with Null Outer Displacement
+                               AMn = MEMPOST;
+                               AnREG = 6 << 3;         // stuff 110 to mode field
+                               goto AnOK;
+                       }
+                       else if (*tok == 'L')
+                       {
+                               AMn = DINDL;                                                                     // (Dn.l)
+                               AnEXTEN = 1 << 11;   // Long index size
+                               tok++;
+                       }
+                       else if (*tok == 'W')                                // (Dn.w)
+                       {
+                               AMn = DINDW;
+                               AnEXTEN = 0 << 11;   // Word index size
+                               tok++;
+                       }
+                       else if (*tok == ',')
+                       {
+                               // ([bd,An],Xn..) without bd, An
+                               // Base displacement is suppressed
+                               AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
+                               AnEXTEN |= EXT_BS;          // Base register suppressed
+                               AnEXTEN |= EXT_BDSIZE0;
+                               AnREG = 6 << 3;         // stuff 110 to mode field
+                               tok++;
+                               goto CHECKODn;
+                       }
+                       else
+                       {
+                               return error("(Dn) error");
+                       }
+
+                       if (*tok == '*')
+                       {                        // scale: *1, *2, *4, *8
+                               tok++;
+
+                               if (*tok == SYMBOL)
+                               {
+                                       if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
+                                               return error("scale factor expression must evaluate");
+
+                                       switch (scaleval)
+                                       {
+                                       case 1:
+                                               break;
+                                       case 2:
+                                               AnIXSIZ |= TIMES2;
+                                               AnEXTEN |= 1 << 9;
+                                               break;
+                                       case 4:
+                                               AnIXSIZ |= TIMES4;
+                                               AnEXTEN |= 2 << 9;
+                                               break;
+                                       case 8:
+                                               AnIXSIZ |= TIMES8;
+                                               AnEXTEN |= 3 << 9;
+                                               break;
+                                       default:
+                                               goto badmode;
+                                       }
+                               }
+                               else if (*tok++ != CONST)
+                                       goto badmode;
+                               else
+                               {
+                                       switch ((int)*tok++)
+                                       {
+                                       case 1:
+                                               break;
+                                       case 2:
+                                               AnIXSIZ |= TIMES2;
+                                               AnEXTEN |= 1 << 9;
+                                               break;
+                                       case 4:
+                                               AnIXSIZ |= TIMES4;
+                                               AnEXTEN |= 2 << 9;
+                                               break;
+                                       case 8:
+                                               AnIXSIZ |= TIMES8;
+                                               AnEXTEN |= 3 << 9;
+                                               break;
+                                       default:
+                                               goto badmode;
+                                       }
+
+                                       tok++;  // Take into account that constants are 64-bit
+                               }
+                       }
+
+                       if (*tok == ')')
+                       {
+                               tok++;
+                               AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
+                               AnEXTEN |= EXT_BS;          // Base register suppressed
+                               AnEXTEN |= EXT_BDSIZE0;     // Base displacement null
+                               AnEXTEN |= EXT_IISPOSN;     // Indirect Postindexed with Null Outer Displacement
+                               AnREG = 6 << 3;         // stuff 110 to mode field
+                               AMn = MEMPOST;
+                               goto AnOK;
+                       }
+                       else if (*tok == ',')
+                       {
+                               tok++;  // eat the comma
+                               // It might be (Dn[.wl][*scale],od)
+                               // Maybe this is wrong and we have to write some code here
+                               // instead of reusing that path...
+                               AnEXTEN |= EXT_FULLWORD;        // Definitely using full extension format, so set bit 8
+                               AnEXTEN |= EXT_BS;       // Base displacement null - suppressed
+                               AnEXTEN |= AnIXREG << 12;
+                               goto CHECKODn;
+                       }
+                       else
+                               return error("unhandled so far");
+               }
+               else if (*tok == KW_PC)
+               {                            // (PC,Xn[.siz][*scale])
+                       tok++;
+                       AMn = PCINDEXED;
+
+                       // Common index handler; enter here with 'tok' pointing at the
+                       // comma.
+
+AMn_IX0:                 // Handle indexed with missing expr
+
+                       AnEXVAL = 0;
+                       AnEXATTR = ABS | DEFINED;
+
+AMn_IXN:                 // Handle any indexed (tok -> a comma)
+
+                       if (*tok++ != ',')
+                               goto badmode;
+
+                       if (*tok < KW_D0 || *tok > KW_A7)
+                               goto badmode;
+
+                       AnIXREG = *tok++ & 15;
+
+                       switch ((int)*tok)
+                       {                        // Index reg size: <empty> | .W | .L
+                       case DOTW:
+                               tok++;
+                       default:
+                               AnIXSIZ = 0;
+                               break;
+                       case DOTL:
+                               AnIXSIZ = 0x0800;
+                               tok++;
+                               break;
+                       case DOTB:               // .B not allowed here...
+                               goto badmode;
+                       }
+
+                       if (*tok == '*')
+                       {                        // scale: *1, *2, *4, *8
+                               tok++;
+
+                               if (*tok == SYMBOL)
+                               {
+                                       if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
+                                               return error("scale factor expression must evaluate");
+
+                                       switch (scaleval)
+                                       {
+                                       case 1:
+                                               break;
+                                       case 2:
+                                               AnIXSIZ |= TIMES2;
+                                               break;
+                                       case 4:
+                                               AnIXSIZ |= TIMES4;
+                                               break;
+                                       case 8:
+                                               AnIXSIZ |= TIMES8;
+                                               break;
+                                       default:
+                                               goto badmode;
+                                       }
+                               }
+                               else if (*tok++ != CONST)
+                                       goto badmode;
+                               else
+                               {
+                                       switch ((int)*tok++)
+                                       {
+                                       case 1:
+                                               break;
+                                       case 2:
+                                               AnIXSIZ |= TIMES2;
+                                               break;
+                                       case 4:
+                                               AnIXSIZ |= TIMES4;
+                                               break;
+                                       case 8:
+                                               AnIXSIZ |= TIMES8;
+                                               break;
+                                       default:
+                                               goto badmode;
+                                       }
+
+                                       tok++;  // Take into account that constants are 64-bit
+                               }
+                       }
+
+                       if (*tok == ',')
+                       {
+                               // If we got here we didn't get any [] stuff
+                               // so let's suppress base displacement before
+                               // branching off
+                               tok++;
+                               AnEXTEN |= EXT_BDSIZE0;     // Base displacement null - suppressed
+                               goto CHECKODn;
+                       }
+                       if (*tok++ != ')')         // final ")"
+                               goto badmode;
+
+                       goto AnOK;
+               }
+               else if (*tok == '[')
+               {                              // ([...
+                       tok++;
+                       AnEXTEN |= EXT_FULLWORD;     // Definitely using full extension format, so set bit 8
+
+                       // Check to see if base displacement is present
+                       if (*tok != CONST && *tok != SYMBOL)
+                       {
+                               AnEXTEN |= EXT_BDSIZE0;
+                       }
+                       else
+                       {
+                               expr(AnBEXPR, &AnBEXVAL, &AnBEXATTR, &AnESYM);
+
+                               if (CHECK_OPTS(OPT_020_DISP) && (AnBEXVAL == 0) && (AnEXATTR != 0))
+                               {
+                                       // bd = 0 so let's optimise it out
+                                       AnEXTEN |= EXT_BDSIZE0;
+                               }
+                               else if (*tok == DOTL)
+                               {
+                                       // ([bd.l,...
+                                       AnEXTEN |= EXT_BDSIZEL;
+                                       tok++;
+                               }
+                               else
+                               {
+                                       // ([bd[.w],... or ([bd,...
+                                       // Is .W forced here?
+                                       if (*tok == DOTW)
+                                       {
+                                               AnEXTEN |= EXT_BDSIZEW;
+                                               tok++;
+                                       }
+                                       else
+                                       {
+                                               // Defined, absolute values from $FFFF8000..$00007FFF
+                                               // get optimized to absolute short
+                                               if (CHECK_OPTS(OPT_020_DISP)
+                                                       && ((AnBEXATTR & (TDB | DEFINED)) == DEFINED)
+                                                       && (((uint32_t)AnBEXVAL + 0x8000) < 0x10000))
+                                               {
+                                                       AnEXTEN |= EXT_BDSIZEW;
+
+                                                       if (optim_warn_flag)
+                                                               warn("absolute value in base displacement ranging $FFFF8000..$00007FFF optimised to absolute short");
+                                               }
+                                               else
+                                               {
+                                                       AnEXTEN |= EXT_BDSIZEL;
+                                               }
+                                       }
+                               }
+
+                               if (*tok == ',')
+                                       tok++;
+                       }
+
+                       // Check for address register or PC, suppress base register
+                       // otherwise
+
+                       if (*tok == KW_PC)
+                       {                                       // ([bd,PC,...
+                               ea_PC = 3;                              // Set flag in order to set proper value to AMn below when we can make a decision on ea
+                                                                               // (why "3"? Well, MEMPOST is 3 away from PCMPOST, etc. Have a look at amode.h)
+                               AnREG = (7 << 3) | 3;   // PC is special case - stuff 011 to register field and 111 to the mode field
+                               tok++;
+                       }
+                       else if ((*tok >= KW_A0) && (*tok <= KW_A7))
+                       {                                       // ([bd,An,...
+                               AnREG = (6 << 3) | (*tok & 7);
+                               tok++;
+                       }
+                       else if ((*tok >= KW_D0) && (*tok <= KW_D7))
+                       {
+                               // ([bd,Dn,...
+                               AnREG = (6 << 3);
+                               AnEXTEN |= ((*tok & 7) << 12);
+                               AnEXTEN |= EXT_D;
+                               AnEXTEN |= EXT_BS; // Oh look, a data register! Which means that base register is suppressed
+                               tok++;
+
+                               // Check for size
+                               // ([bd,An/PC],Xn.W/L...)
+                               switch ((int)*tok)
+                               {
+                               // Index reg size: <empty> | .W | .L
+                               case DOTW:
+                                       tok++;
+                                       break;
+                               default:
+                                       break;
+                               case DOTL:
+                                       AnEXTEN |= EXT_L;
+                                       tok++;
+                                       break;
+                               case DOTB:
+                                       // .B not allowed here...
+                                       goto badmode;
+                               }
+
+                               // Check for scale
+                               if (*tok == '*')                        // ([bd,An/PC],Xn*...)
+                               {                           // scale: *1, *2, *4, *8
+                                       tok++;
+
+                                       if (*tok == SYMBOL)
+                                       {
+                                               if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
+                                                       return error("scale factor expression must evaluate");
+
+                                               switch (scaleval)
+                                               {
+                                               case 1:
+                                                       break;
+                                               case 2:
+                                                       AnIXSIZ |= TIMES2;
+                                                       break;
+                                               case 4:
+                                                       AnIXSIZ |= TIMES4;
+                                                       break;
+                                               case 8:
+                                                       AnIXSIZ |= TIMES8;
+                                                       break;
+                                               default:
+                                                       goto badmode;
+                               }
+                                       }
+                                       else if (*tok++ != CONST)
+                                               goto badmode;
+                                       else
+                                       {
+                                               switch ((int)*tok++)
+                                               {
+                                               case 1:
+                                                       break;
+                                               case 2:
+                                                       AnIXSIZ |= TIMES2;
+                                                       break;
+                                               case 4:
+                                                       AnIXSIZ |= TIMES4;
+                                                       break;
+                                               case 8:
+                                                       AnIXSIZ |= TIMES8;
+                                                       break;
+                                               default:
+                                                       goto badmode;
+                                               }
+
+                                               tok++;  // Take into account that constants are 64-bit
+                                       }
+                               }
+                               if (*tok == ']')  // ([bd,Dn]...
+                               {
+                                       tok++;
+                                       goto IS_SUPPRESSEDn;
+                               }
+                       }
+                       else if (*tok == ']')
+                       {
+                               // PC and Xn is suppressed
+                               AnREG = 6 << 3;         // stuff 110b to mode field
+                               AnEXTEN |= EXT_BS;
+                       }
+                       else
+                       {
+                               goto badmode;
+                       }
+
+                       // At a crossroads here. We can accept either ([bd,An/PC],... or ([bd,An/PC,Xn*scale],...
+                       if (*tok == ']')
+                       {
+                               // ([bd,An/PC],Xn,od)
+                               // Check for Xn
+                               tok++;
+
+                               if (*tok == ')')
+                               {
+                                       // Xn and od are non existent, get out of jail free card
+                                       tok++;
+                                       AMn = MEMPRE + ea_PC;                           // ([bc,An,Xn],od) with no Xn and od
+                                       AnEXTEN |= EXT_IS | EXT_IISPREN;        // Suppress Xn and od
+                                       goto AnOK;
+                               }
+                               else if (*tok != ',')
+                                       return error("comma expected after ]");
+                               else
+                                       tok++;                          // eat the comma
+
+                               if ((*tok >= KW_A0) && (*tok <= KW_A7))
+                               {
+                                       AnIXREG = ((*tok & 7) << 12);
+                                       AnEXTEN |= EXT_A;
+                                       tok++;
+                               }
+                               else if ((*tok >= KW_D0) && (*tok <= KW_D7))
+                               {
+                                       AnEXTEN |= ((*tok & 7) << 12);
+                                       AnEXTEN |= EXT_D;
+                                       tok++;
+                               }
+                               else
+                               {
+                                       // No index found, suppress it
+                                       AnEXTEN |= EXT_IS;
+                                       tok--;                                  // Rewind tok to point to the comma
+                                       goto IS_SUPPRESSEDn;    // https://xkcd.com/292/ - what does he know anyway?
+                               }
+
+                               // Check for Xn size
+                               // ([bd,An/PC],Xn.W/L...)
+                               switch ((int)*tok)
+                               {
+                               // Index reg size: <empty> | .W | .L
+                               case DOTW:
+                                       tok++;
+                                       break;
+                               case DOTL:
+                                       AnEXTEN |= EXT_L;
+                                       tok++;
+                                       break;
+                               case DOTB:
+                                       // .B not allowed here...
+                                       goto badmode;
+                               default:
+                                       break;
+                               }
+
+                               // Check for Xn scale
+                               if (*tok == '*')                   // ([bd,An/PC],Xn*...)
+                               {                                  // scale: *1, *2, *4, *8
+                                       tok++;
+
+                                       if (*tok == SYMBOL)
+                                       {
+                                               if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
+                                                       return error("scale factor expression must evaluate");
+                                       }
+                                       else if (*tok == CONST)
+                                       {
+                                               scaleval = (int)*tok++;
+                                               tok++;  // Take into account that constants are 64-bit
+                                       }
+                                       else
+                                               goto badmode;
+
+                                       switch (scaleval)
+                                       {
+                                       case 1:
+                                               break;
+                                       case 2:
+                                               AnIXSIZ |= TIMES2;
+                                               break;
+                                       case 4:
+                                               AnIXSIZ |= TIMES4;
+                                               break;
+                                       case 8:
+                                               AnIXSIZ |= TIMES8;
+                                               break;
+                                       default:
+                                               goto badmode;
+                                       }
+
+                               }
+
+                               // Check for od
+                               if (*tok == ')')        // ([bd,An/PC],Xn)
+                               {
+                                       // od is non existent, get out of jail free card
+                                       AMn = MEMPOST + ea_PC;  // let's say it's ([bd,An],Xn,od) with od=0 then
+                                       AnEXTEN |= EXT_IISPOSN; // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else if (*tok != ',')
+                                       return error("comma expected");
+                               else
+                                       tok++;  // eat the comma
+
+CHECKODn:
+                               if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
+                                       goto badmode;
+
+                               if (CHECK_OPTS(OPT_020_DISP) && (AnEXATTR & DEFINED) && (AnEXVAL == 0))
+                               {
+                                       // od = 0 so optimise it out
+                                       AMn = MEMPOST + ea_PC;          // let's say it's ([bd,An],Xn,od) with od=0 then
+                                       AnEXTEN |= EXT_IISPOSN;         // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+
+                               // ([bd,An/PC],Xn,od)
+                               // Is .W forced here?
+                               if (*tok == DOTW)
+                               {
+                                       tok++;
+                                       // od[.W]
+                                       AnEXTEN |= EXT_IISPOSW; // Word outer displacement
+                                       AMn = MEMPOST + ea_PC;
+                               }
+                               else
+                               {
+                                       // Is .L forced here?
+                                       if (*tok == DOTL)
+                                               tok++;                          // Doesn't matter, we're going for .L anyway
+
+                                       WORD od_ea = 0;
+
+                                       // od.L
+                                       if (!(AnEXTEN & EXT_BS))
+                                               od_ea = EXT_IISPOSL; // Long outer displacement
+                                       else
+                                       {
+                                               // bd is suppressed, so sticking the od size in bd
+                                               od_ea = EXT_BDSIZEL;
+                                               // And of course the expression has to be copied to
+                                               // AnBEXPR instead of AnEXPR. Yay. :-/
+                                               int i = 0;
+
+                                               do
+                                               {
+                                                       AnBEXPR[i] = AnEXPR[i];
+                                                       i++;
+                                               }
+                                               while (AnEXPR[i] != 'E');
+
+                                               AnBEXPR[i] = 'E';
+                                       }
+
+                                       AMn = MEMPOST + ea_PC;
+
+                                       // Defined, absolute values from $FFFF8000..$00007FFF get
+                                       // optimized to absolute short
+                                       if (CHECK_OPTS(OPT_020_DISP)
+                                               && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
+                                               && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
+                                       {
+                                               od_ea = EXT_IISPOSW; // Word outer displacement
+                                               AMn = MEMPOST + ea_PC;
+
+                                               if (optim_warn_flag)
+                                                       warn("absolute value in outer displacement ranging $FFFF8000..$00007FFF optimised to absolute short");
+                                       }
+                                       AnEXTEN |= od_ea;
+                               }
+
+                               // Check for final closing parenthesis
+                               if (*tok == ')')
+                               {
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else
+                                       return error("Closing parenthesis missing on addressing mode");
+
+IS_SUPPRESSEDn:
+
+                               // Check for od
+                               if (*tok == ')')        // ([bd,An/PC],Xn)
+                               {
+                                       // od is non existent, get out of jail free card
+                                       AMn = MEMPOST + ea_PC;          // let's say it's ([bd,An],Xn,od) with od=0 then
+                                       AnEXTEN |= EXT_IISNOIN; // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else if (*tok!=',')
+                                       return error("comma expected");
+                               else
+                                       tok++;  // eat the comma
+
+                               if ((*tok != CONST) && (*tok != SYMBOL))
+                                       goto badmode;
+
+                               expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM);
+
+                               if (CHECK_OPTS(OPT_020_DISP) && (AnEXVAL == 0))
+                               {
+                                       // od=0 so optimise it out
+                                       AMn = MEMPOST + ea_PC;           // let's say it's ([bd,An],Xn,od) with od=0 then
+                                       AnEXTEN |= EXT_IISNOIN; // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+
+                               // ([bd,An/PC],Xn,od)
+                               if (*tok == DOTL)
+                               {
+                                       // expr.L
+                                       tok++;
+                                       AMn = MEMPOST + ea_PC;
+                                       AnEXTEN |= EXT_IISNOIL; // Long outer displacement with IS suppressed
+                               }
+                               else
+                               {
+                                       // expr[.W][]
+                                       AnEXTEN |= EXT_IISNOIW; // Word outer displacement with IS suppressed
+                                       AMn = MEMPRE + ea_PC;;
+
+                                       if (*tok == DOTW)
+                                       {
+                                               //AnEXTEN|=EXT_IISNOIW; // Word outer displacement
+                                               AMn = MEMPOST + ea_PC;
+                                               tok++;
+                                       }
+                                       // Defined, absolute values from $FFFF8000..$00007FFF get
+                                       // optimized to absolute short
+                                       else if (CHECK_OPTS(OPT_020_DISP)
+                                               && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
+                                               && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
+                                       {
+                                               //AnEXTEN|=EXT_IISNOIW; // Word outer displacement with IS suppressed
+                                               if (optim_warn_flag)
+                                                       warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+                                       }
+                               }
+
+                               // Check for final closing parenthesis
+                               if (*tok == ')')
+                               {
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else
+                                       return error("Closing parenthesis missing on addressing mode");
+                       }
+                       else if (*tok == ',')
+                       {
+                               tok++;                  // ([bd,An,Xn.size*scale],od)
+
+                               // Check for Xn
+                               if ((*tok >= KW_A0) && (*tok <= KW_A7))
+                               {
+                                       AnEXTEN |= ((*tok & 7) << 12);
+                                       AnEXTEN |= EXT_A;
+                                       tok++;
+                               }
+                               else if ((*tok >= KW_D0) && (*tok <= KW_D7))
+                               {
+                                       AnEXTEN |= ((*tok & 7) << 12);
+                                       AnEXTEN |= EXT_D;
+                                       tok++;
+                               }
+
+                               // Check for size
+                               // ([bd,An/PC],Xn.W/L...)
+                               switch ((int)*tok)
+                               {
+                               // Index reg size: <empty> | .W | .L
+                               case DOTW:
+                                       tok++;
+                                       break;
+                               default:
+                                       break;
+                               case DOTL:
+                                       tok++;
+                                       AnEXTEN |= EXT_L;
+                                       break;
+                               case DOTB:
+                               // .B not allowed here...
+                               goto badmode;
+                               }
+
+                               // Check for scale
+                               if (*tok == '*')                                // ([bd,An/PC],Xn*...)
+                               {                                                               // scale: *1, *2, *4, *8
+                                       tok++;
+
+                                       if (*tok == SYMBOL)
+                                       {
+                                               if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
+                                                       return error("scale factor expression must evaluate");
+
+                                               switch (scaleval)
+                                               {
+                                               case 1:
+                                                       break;
+                                               case 2:
+                                                       AnIXSIZ |= TIMES2;
+                                                       break;
+                                               case 4:
+                                                       AnIXSIZ |= TIMES4;
+                                                       break;
+                                               case 8:
+                                                       AnIXSIZ |= TIMES8;
+                                                       break;
+                                               default:
+                                                       goto badmode;
+                                               }
+                                       }
+                                       else if (*tok++ != CONST)
+                                               goto badmode;
+                                       else
+                                       {
+                                               switch ((int)*tok++)
+                                               {
+                                               case 1:
+                                                       break;
+                                               case 2:
+                                                       AnIXSIZ |= TIMES2;
+                                                       AnEXTEN |= 1 << 9;
+                                                       break;
+                                               case 4:
+                                                       AnIXSIZ |= TIMES4;
+                                                       AnEXTEN |= 2 << 9;
+                                                       break;
+                                               case 8:
+                                                       AnIXSIZ |= TIMES8;
+                                                       AnEXTEN |= 3 << 9;
+                                                       break;
+                                               default:
+                                                       goto badmode;
+                                               }
+
+                                               tok++;  // Take into account that constants are 64-bit
+                                       }
+                               }
+
+                               // Check for ]
+                               if (*tok != ']')
+                                       return error("Expected closing bracket ]");
+                               tok++;                  // Eat the bracket
+
+                               // Check for od
+                               if (*tok == ')')        // ([bd,An/PC,Xn]...
+                               {
+                                       // od is non existent, get out of jail free card
+                                       AMn = MEMPRE + ea_PC;                   // let's say it's ([bd,An,Xn],od) with od suppressed then
+                                       AnEXTEN |= EXT_IISPREN; // No outer displacement
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else if (*tok++ != ',')
+                                       return error("comma expected after ]");
+
+                               if (*tok == SYMBOL || *tok == CONST)
+                               {
+                                       if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
+                                               goto badmode;
+
+                                       if (CHECK_OPTS(OPT_020_DISP) && (AnEXVAL == 0) && (AnEXATTR & DEFINED))
+                                       {
+                                               // od=0 so optimise it out
+                                               AMn = MEMPRE + ea_PC;            // let's say it's ([bd,An],Xn,od) with od=0 then
+                                               AnEXTEN |= EXT_IISPRE0; // No outer displacement
+                                               tok++;
+                                               goto AnOK;
+                                       }
+                               }
+
+                               // ([bd,An/PC,Xn],od)
+                               if (*tok == DOTL)
+                               {
+                                       // expr.L
+                                       AMn = MEMPRE + ea_PC;
+                                       tok++;
+                                       AnEXTEN |= EXT_IISPREL;
+                               }
+                               else
+                               {
+                                       // expr.[W]
+                                       AMn = MEMPRE + ea_PC;
+                                       int expr_size = EXT_IISPREW; // Assume we have a .w value
+
+                                       if ((AnEXVAL + 0x8000) > 0x10000)
+                                       {
+                                               // Long value, so mark it as such for now
+                                               expr_size = EXT_IISPREL;
+
+                                               // Defined, absolute values from $FFFF8000..$00007FFF
+                                               // get optimized to absolute short
+                                               if (CHECK_OPTS(OPT_020_DISP)
+                                                       && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
+                                                       && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
+                                               {
+                                                       expr_size = EXT_IISPREW;
+
+                                                       if (optim_warn_flag)
+                                                               warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+                                               }
+                                       }
+
+                                       AnEXTEN |= expr_size; // Assume we have a .w value
+
+                                       // Is .W forced here?
+                                       if (*tok == DOTW)
+                                       {
+                                               tok++;
+
+                                               if (expr_size == EXT_IISPREL)
+                                                       return error("outer displacement value does not fit in .w size");
+                                       }
+                               }
+
+                               // Check for final closing parenthesis
+                               if (*tok == ')')
+                               {
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else
+                                       return error("Closing parenthesis missing on addressing mode");
+                       }
+                       else
+                               goto badmode;
+               }
+               else
+               {
+                       // (expr...
+                       if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
+                               return ERROR;
+
+                       // It could be that this is really just an expression prefixing a
+                       // register as a displacement...
+                       if (*tok == ')')
+                       {
+                               tok++;
+                               goto CHK_FOR_DISPn;
+                       }
+
+                       // Otherwise, check for PC & etc displacements...
+                       if (*tok++ != ',')
+                               goto badmode;
+
+                       if ((*tok >= KW_A0) && (*tok <= KW_A7))
+                       {
+                               AnREG = *tok & 7;
+                               tok++;
+
+                               if (*tok == ',')
+                               {
+                                       // Check if we're actually doing d8(An,Dn) or
+                                       // (d16,An,Dn[.size][*scale])
+                                       // TODO: not a very clear cut case from what I can think.
+                                       // The only way to distinguish between the two is to check
+                                       // AnEXVAL and see if it's >127 or <-128. But this doesn't
+                                       // work if AnEXVAL isn't defined yet. For now we fall
+                                       // through to d8(An,Dn) but this might bite us in the arse
+                                       // during fixups...
+                                       if ((AnEXATTR & DEFINED) && (AnEXVAL + 0x80 > 0x100))
+                                       {
+                                               // We're going to treat it as a full extension format
+                                               // with no indirect access and no base displacement/
+                                               // index register suppression
+                                               AnEXTEN |= EXT_FULLWORD;        // Definitely using full extension format, so set bit 8
+                                               AnEXTEN |= EXT_IISPRE0;         // No Memory Indirect Action
+                                               AnEXTEN |= EXT_BDSIZEL;         // Base Displacement Size Long
+                                               tok++;                                          // Get past the comma
+
+                                               // Our expression is techically a base displacement,
+                                               // so let's copy it to the relevant variables so
+                                               // eagen0.c can pick it up properly
+                                               AnBEXVAL = AnEXVAL;
+                                               AnBEXATTR = AnEXATTR;
+
+                                               if ((*tok >= KW_D0) && (*tok <= KW_D7))
+                                               {
+                                                       AnEXTEN |= ((*tok++) & 7) << 12;
+                                                       // Check for size
+                                                       {
+                                                               switch ((int)*tok)
+                                                               {
+                                                               // Index reg size: <empty> | .W | .L
+                                                               case DOTW:
+                                                                       tok++;
+                                                                       break;
+                                                               default:
+                                                                       break;
+                                                               case DOTL:
+                                                                       tok++;
+                                                                       AnEXTEN |= EXT_L;
+                                                                       break;
+                                                               case DOTB:
+                                                                       // .B not allowed here...
+                                                                       goto badmode;
+                                                               }
+                                                       }
+                                                       // Check for scale
+                                                       if (*tok == '*')                // (d16,An,Dn[.size][*scale])
+                                                       {                                               // scale: *1, *2, *4, *8
+                                                               tok++;
+
+                                                               if (*tok == SYMBOL)
+                                                               {
+                                                                       if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
+                                                                               return error("scale factor expression must evaluate");
+
+                                                                       switch (scaleval)
+                                                                       {
+                                                                       case 1:
+                                                                               break;
+                                                                       case 2:
+                                                                               AnIXSIZ |= TIMES2;
+                                                                               break;
+                                                                       case 4:
+                                                                               AnIXSIZ |= TIMES4;
+                                                                               break;
+                                                                       case 8:
+                                                                               AnIXSIZ |= TIMES8;
+                                                                               break;
+                                                                       default:
+                                                                               goto badmode;
+                                                                       }
+                                                               }
+                                                               else if (*tok++ != CONST)
+                                                                       goto badmode;
+                                                               else
+                                                               {
+                                                                       switch ((int)*tok++)
+                                                                       {
+                                                                       case 1:
+                                                                               break;
+                                                                       case 2:
+                                                                               AnIXSIZ |= TIMES2;
+                                                                               break;
+                                                                       case 4:
+                                                                               AnIXSIZ |= TIMES4;
+                                                                               break;
+                                                                       case 8:
+                                                                               AnIXSIZ |= TIMES8;
+                                                                               break;
+                                                                       default:
+                                                                               goto badmode;
+                                                                       }
+
+                                                                       tok++;  // Take into account that constants are 64-bit
+                                                               }
+                                                       }
+
+                                                       if (*tok++ != ')')
+                                                               return error("Closing parenthesis missing on addressing mode");
+
+                                                       // Let's say that this is the closest to our case
+                                                       AMn = MEMPOST;
+                                                       goto AnOK;
+                                               }
+                                               else
+                                                       goto badmode;
+                                       }
+
+                                       AMn = AINDEXED;
+                                       goto AMn_IXN;
+                               }
+                               else if (*tok == ')')
+                               {
+                                       AMn = ADISP;
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else
+                                       goto badmode;
+                       }
+                       else if (*tok == KW_PC)
+                       {
+                               if (*++tok == ',')
+                               {                             // expr(PC,Xn...)
+                                       AMn = PCINDEXED;
+                                       goto AMn_IXN;
+                               }
+                               else if (*tok == ')')
+                               {
+                                       AMn = PCDISP;             // expr(PC)
+                                       tok++;
+                                       goto AnOK;
+                               }
+                               else
+                                       goto badmode;
+                       }
+                       else
+                               goto badmode;
+               }
+       }
+       else if (*tok == '-' && tok[1] == '(' && ((tok[2] >= KW_A0) && (tok[2] <= KW_A7)) && tok[3] == ')')
+       {
+               AMn = APREDEC;
+               AnREG = tok[2] & 7;
+               tok += 4;
+       }
+       else if (*tok == KW_CCR)
+       {
+               AMn = AM_CCR;
+               tok++;
+               goto AnOK;
+       }
+       else if (*tok == KW_SR)
+       {
+               AMn = AM_SR;
+               tok++;
+               goto AnOK;
+       }
+       else if (*tok == KW_USP)
+       {
+               AMn = AM_USP;
+               tok++;
+               AnREG = 2;      // Added this for the case of USP used in movec (see CREGlut in mach.c). Hopefully nothing gets broken!
+               goto AnOK;
+       }
+       else if ((*tok >= KW_IC40) && (*tok <= KW_BC40))
+       {
+               AMn = CACHES;
+               AnREG = *tok++ - KW_IC40;
+
+               // After a cache keyword only a comma or EOL is allowed
+               if ((*tok != ',') && (*tok != EOL))
+                       return ERROR;
+               goto AnOK;
+       }
+       else if ((*tok >= KW_SFC) && (*tok <= KW_CRP))
+       {
+               AMn = CREG;
+               AnREG = (*tok++) - KW_SFC;
+               goto AnOK;
+       }
+       else if ((*tok >= KW_FP0) && (*tok <= KW_FP7))
+       {
+               AMn = FREG;
+               AnREG = (*tok++ & 7);
+       }
+       else if ((*tok >= KW_FPIAR) && (*tok <= KW_FPCR))
+       {
+               AMn = FPSCR;
+               AnREG = (1 << ((*tok++) - KW_FPIAR + 10));
+       }
+       // expr
+       // expr.w
+       // expr.l
+       // d16(An)
+       // d8(An,Xn[.siz])
+       // d16(PC)
+       // d8(PC,Xn[.siz])
+       else
+       {
+               if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
+                       return ERROR;
+
+CHK_FOR_DISPn:
+               if (*tok == DOTW)
+               {
+                       // expr.W
+                       tok++;
+                       AMn = ABSW;
+
+                       if (((AnEXATTR & (TDB | DEFINED)) == DEFINED) && (AnEXVAL < 0x10000))
+                               AnEXVAL = (int32_t)(int16_t)AnEXVAL;  // Sign extend value
+
+                       goto AnOK;
+               }
+               else if (*tok != '(')
+               {
+                       // expr[.L]
+                       AMn = ABSL;
+
+                       // When PC relative is enforced, check for any symbols that aren't
+                       // EQU'd, in this case it's an illegal mode
+                       if ((CHECK_OPTS(OPT_PC_RELATIVE)) && (AnEXATTR & REFERENCED) && (AnEXATTR & DEFINED) && (!(AnEXATTR & EQUATED)))
+                               return error("relocation not allowed");
+
+                       // .L is forced here
+                       if (*tok == DOTL)
+                       {
+                               tok++;
+                               AMn = ABSL;
+                       }
+                       else
+                       {
+                               // Defined, absolute values from $FFFF8000..$00007FFF get
+                               // optimized to absolute short
+                               if (CHECK_OPTS(OPT_ABS_SHORT)
+                                       && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
+                                       && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
+                               {
+                                       AMn = ABSW;
+
+                                       if (optim_warn_flag)
+                                               warn("absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+                               }
+                       }
+
+                       goto AnOK;
+               }
+
+               tok++;
+
+               if ((*tok >= KW_A0) && (*tok <= KW_A7))
+               {
+                       AnREG = *tok++ & 7;
+
+                       if (*tok == ')')
+                       {
+                               AMn = ADISP;
+                               tok++;
+                               goto AnOK;
+                       }
+
+                       AMn = AINDEXED;
+                       goto AMn_IXN;
+               }
+               else if (*tok == KW_PC)
+               {
+                       if (*++tok == ')')
+                       {
+                               AMn = PCDISP;
+                               tok++;
+                               goto AnOK;
+                       }
+
+                       AMn = PCINDEXED;
+                       goto AMn_IXN;
+               }
+
+               goto badmode;
+       }
+
+       // Addressing mode OK
+AnOK:
+       ;
 }
 
-// Cleanup dirty little macros
+// Clean up dirty little macros
 #undef AnOK
 #undef AMn
 #undef AnREG
 #undef AnESYM
 #undef AMn_IX0
 #undef AMn_IXN
+#undef CHK_FOR_DISPn
+#undef AnBEXPR
+#undef AnBEXVAL
+#undef AnBEXATTR
+#undef AnBZISE
+#undef AnEXTEN
+#undef AMn_030
+#undef IS_SUPPRESSEDn
+#undef CHECKODn