+ 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(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
+ return error("scale factor expression must evaluate");
+
+ switch (AnEXVAL)
+ {
+ 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 || *tok > 8)
+ 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;
+ }
+ }
+ }
+ if (*tok == ']') // ([bd,Dn]...
+ {
+ tok++;
+ goto IS_SUPPRESSEDn;
+ }
+ }
+ else if (*tok == ']')
+ {
+ // PC and Xn is suppressed
+ AnREG = 6 << 3; // stuff 110 to mode field
+ //AnEXTEN|=EXT_BS|EXT_IS;
+ 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; // ([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 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(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
+ return error("scale factor expression must evaluate");
+
+ switch (AnEXVAL)
+ {
+ 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 || *tok > 8)
+ 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;
+ }
+ }
+ }
+
+ // Check for od
+ if (*tok == ')') // ([bd,An/PC],Xn)
+ {
+ //od is non existant, get out of jail free card
+ AMn = MEMPOST; // 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_BASE_DISP) && (AnEXVAL == 0))
+ {
+ // od=0 so optimise it out
+ AMn = MEMPOST; // 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)
+ if (*tok == DOTL)
+ {
+ // expr.L
+ AnEXTEN |= EXT_IISPOSL; // Long outer displacement
+ AMn = MEMPOST;
+ tok++;
+
+ // 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))
+ {
+ AnEXTEN |= EXT_IISPOSW; // Word outer displacement
+ AMn = MEMPOST;
+ warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+ }
+
+ }
+ else
+ {
+ // expr[.W]
+ AnEXTEN |= EXT_IISPOSW; // Word outer displacement
+ AMn = MEMPOST;
+
+ // Is .W forced here?
+ if (*tok == DOTW)
+ tok++;
+ }
+
+ // 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 existant, get out of jail free card
+ AMn = MEMPOST; // 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_BASE_DISP) && (AnEXVAL == 0))
+ {
+ // od=0 so optimise it out
+ AMn = MEMPOST; // 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;
+ AnEXTEN |= EXT_IISNOIL; // Long outer displacement with IS suppressed
+ }
+ else
+ {
+ // expr[.W][]
+ AnEXTEN |= EXT_IISNOIW; // Word outer displacement with IS suppressed
+ AMn = MEMPRE;
+
+ if (*tok == DOTW)
+ {
+ //AnEXTEN|=EXT_IISNOIW; // Word outer displacement
+ AMn = MEMPOST;
+ tok++;
+ }
+ // Defined, absolute values from $FFFF8000..$00007FFF get
+ // optimized to absolute short
+ else if (CHECK_OPTS(OPT_BASE_DISP)
+ && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
+ && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
+ {
+ //AnEXTEN|=EXT_IISNOIW; // Word outer displacement with IS suppressed
+ 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++;