2 // RMAC - Renamed Macro Assembler for all Atari computers
3 // PARMODE.C - Addressing Modes Parser Include
4 // Copyright (C) 199x Landon Dyer, 2011-2021 Reboot and Friends
5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
6 // Source utilised with the kind permission of Landon Dyer
9 // This file is included (twice) to parse two addressing modes, into slightly
10 // different var names
12 uint64_t scaleval; // Expression's value
13 TOKEN scaleexpr[EXPRSIZE]; // Expression
14 WORD scaleattr; // Expression's attribute
15 SYM * scaleesym; // External symbol involved in expr
20 if ((*tok >= KW_D0) && (*tok <= KW_D7))
25 else if ((*tok >= KW_A0) && (*tok <= KW_A7))
34 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
40 // Small problem with this is that the opening parentheses might be an
41 // expression that's part of a displacement; this code will falsely flag
46 // (An,Xn[.siz][*scale])
47 // (PC,Xn[.siz][*scale])
49 // (d8,An,Xn[.siz][*scale])
51 // (d8,PC,Xn[.siz][*scale])
52 // ([bd,An],Xn[.siz][*scale],od)
53 // ([bd,An,Xn[.siz][*scale]],od)
54 // ([bd,PC],Xn[.siz][*scale],od)
55 // ([bd,PC,Xn[.siz][*scale]],od)
58 int ea_PC = 0; // Flag that let us know if we have PC or An relative ea
61 if ((*tok >= KW_A0) && (*tok <= KW_A7))
81 goto AMn_IX0; // Handle ",Xn[.siz][*scale])"
83 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
85 // Since index register isn't used here, store register number in this field
86 AnIXREG = *tok++ & 7; // (Dn)
91 AnEXTEN |= EXT_FULLWORD; // Definitely using full extension format, so set bit 8
92 AnEXTEN |= EXT_BS; // Base register suppressed
93 AnEXTEN |= EXT_BDSIZE0; // Base displacement null
94 AnEXTEN |= EXT_IISPOSN; // Indirect Postindexed with Null Outer Displacement
96 AnREG = 6 << 3; // stuff 110 to mode field
101 AMn = DINDL; // (Dn.l)
102 AnEXTEN = 1 << 11; // Long index size
105 else if (*tok == 'W') // (Dn.w)
108 AnEXTEN = 0 << 11; // Word index size
111 else if (*tok == ',')
113 // ([bd,An],Xn..) without bd, An
114 // Base displacement is suppressed
115 AnEXTEN |= EXT_FULLWORD; // Definitely using full extension format, so set bit 8
116 AnEXTEN |= EXT_BS; // Base register suppressed
117 AnEXTEN |= EXT_BDSIZE0;
118 AnREG = 6 << 3; // stuff 110 to mode field
124 return error("(Dn) error");
128 { // scale: *1, *2, *4, *8
133 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
134 return error("scale factor expression must evaluate");
156 else if (*tok++ != CONST)
180 tok++; // Take into account that constants are 64-bit
187 AnEXTEN |= EXT_FULLWORD; // Definitely using full extension format, so set bit 8
188 AnEXTEN |= EXT_BS; // Base register suppressed
189 AnEXTEN |= EXT_BDSIZE0; // Base displacement null
190 AnEXTEN |= EXT_IISPOSN; // Indirect Postindexed with Null Outer Displacement
191 AnREG = 6 << 3; // stuff 110 to mode field
195 else if (*tok == ',')
197 tok++; // eat the comma
198 // It might be (Dn[.wl][*scale],od)
199 // Maybe this is wrong and we have to write some code here
200 // instead of reusing that path...
201 AnEXTEN |= EXT_FULLWORD; // Definitely using full extension format, so set bit 8
202 AnEXTEN |= EXT_BS; // Base displacement null - suppressed
203 AnEXTEN |= AnIXREG << 12;
207 return error("unhandled so far");
209 else if (*tok == KW_PC)
210 { // (PC,Xn[.siz][*scale])
214 // Common index handler; enter here with 'tok' pointing at the
217 AMn_IX0: // Handle indexed with missing expr
220 AnEXATTR = ABS | DEFINED;
222 AMn_IXN: // Handle any indexed (tok -> a comma)
227 if (*tok < KW_D0 || *tok > KW_A7)
230 AnIXREG = *tok++ & 15;
233 { // Index reg size: <empty> | .W | .L
243 case DOTB: // .B not allowed here...
248 { // scale: *1, *2, *4, *8
253 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
254 return error("scale factor expression must evaluate");
273 else if (*tok++ != CONST)
294 tok++; // Take into account that constants are 64-bit
300 // If we got here we didn't get any [] stuff
301 // so let's suppress base displacement before
304 AnEXTEN |= EXT_BDSIZE0; // Base displacement null - suppressed
307 if (*tok++ != ')') // final ")"
312 else if (*tok == '[')
315 AnEXTEN |= EXT_FULLWORD; // Definitely using full extension format, so set bit 8
317 // Check to see if base displacement is present
318 if (*tok != CONST && *tok != SYMBOL)
320 AnEXTEN |= EXT_BDSIZE0;
324 expr(AnBEXPR, &AnBEXVAL, &AnBEXATTR, &AnESYM);
326 if (CHECK_OPTS(OPT_020_DISP) && (AnBEXVAL == 0) && (AnEXATTR != 0))
328 // bd = 0 so let's optimise it out
329 AnEXTEN |= EXT_BDSIZE0;
331 else if (*tok == DOTL)
334 AnEXTEN |= EXT_BDSIZEL;
339 // ([bd[.w],... or ([bd,...
340 // Is .W forced here?
343 AnEXTEN |= EXT_BDSIZEW;
348 // Defined, absolute values from $FFFF8000..$00007FFF
349 // get optimized to absolute short
350 if (CHECK_OPTS(OPT_020_DISP)
351 && ((AnBEXATTR & (TDB | DEFINED)) == DEFINED)
352 && (((uint32_t)AnBEXVAL + 0x8000) < 0x10000))
354 AnEXTEN |= EXT_BDSIZEW;
357 warn("absolute value in base displacement ranging $FFFF8000..$00007FFF optimised to absolute short");
361 AnEXTEN |= EXT_BDSIZEL;
370 // Check for address register or PC, suppress base register
375 ea_PC = 3; // Set flag in order to set proper value to AMn below when we can make a decision on ea
376 // (why "3"? Well, MEMPOST is 3 away from PCMPOST, etc. Have a look at amode.h)
377 AnREG = (7 << 3) | 3; // PC is special case - stuff 011 to register field and 111 to the mode field
380 else if ((*tok >= KW_A0) && (*tok <= KW_A7))
382 AnREG = (6 << 3) | (*tok & 7);
385 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
389 AnEXTEN |= ((*tok & 7) << 12);
391 AnEXTEN |= EXT_BS; // Oh look, a data register! Which means that base register is suppressed
395 // ([bd,An/PC],Xn.W/L...)
398 // Index reg size: <empty> | .W | .L
409 // .B not allowed here...
414 if (*tok == '*') // ([bd,An/PC],Xn*...)
415 { // scale: *1, *2, *4, *8
420 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
421 return error("scale factor expression must evaluate");
440 else if (*tok++ != CONST)
461 tok++; // Take into account that constants are 64-bit
464 if (*tok == ']') // ([bd,Dn]...
470 else if (*tok == ']')
472 // PC and Xn is suppressed
473 AnREG = 6 << 3; // stuff 110b to mode field
481 // At a crossroads here. We can accept either ([bd,An/PC],... or ([bd,An/PC,Xn*scale],...
484 // ([bd,An/PC],Xn,od)
490 // Xn and od are non existent, get out of jail free card
492 AMn = MEMPRE + ea_PC; // ([bc,An,Xn],od) with no Xn and od
493 AnEXTEN |= EXT_IS | EXT_IISPREN; // Suppress Xn and od
496 else if (*tok != ',')
497 return error("comma expected after ]");
499 tok++; // eat the comma
501 if ((*tok >= KW_A0) && (*tok <= KW_A7))
503 AnIXREG = ((*tok & 7) << 12);
507 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
509 AnEXTEN |= ((*tok & 7) << 12);
515 // No index found, suppress it
517 tok--; // Rewind tok to point to the comma
518 goto IS_SUPPRESSEDn; // https://xkcd.com/292/ - what does he know anyway?
522 // ([bd,An/PC],Xn.W/L...)
525 // Index reg size: <empty> | .W | .L
534 // .B not allowed here...
540 // Check for Xn scale
541 if (*tok == '*') // ([bd,An/PC],Xn*...)
542 { // scale: *1, *2, *4, *8
547 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
548 return error("scale factor expression must evaluate");
550 else if (*tok == CONST)
552 scaleval = (int)*tok++;
553 tok++; // Take into account that constants are 64-bit
578 if (*tok == ')') // ([bd,An/PC],Xn)
580 // od is non existent, get out of jail free card
581 AMn = MEMPOST + ea_PC; // let's say it's ([bd,An],Xn,od) with od=0 then
582 AnEXTEN |= EXT_IISPOSN; // No outer displacement
586 else if (*tok != ',')
587 return error("comma expected");
589 tok++; // eat the comma
592 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
595 if (CHECK_OPTS(OPT_020_DISP) && (AnEXATTR & DEFINED) && (AnEXVAL == 0))
597 // od = 0 so optimise it out
598 AMn = MEMPOST + ea_PC; // let's say it's ([bd,An],Xn,od) with od=0 then
599 AnEXTEN |= EXT_IISPOSN; // No outer displacement
604 // ([bd,An/PC],Xn,od)
605 // Is .W forced here?
610 AnEXTEN |= EXT_IISPOSW; // Word outer displacement
611 AMn = MEMPOST + ea_PC;
615 // Is .L forced here?
617 tok++; // Doesn't matter, we're going for .L anyway
622 if (!(AnEXTEN & EXT_BS))
623 od_ea = EXT_IISPOSL; // Long outer displacement
626 // bd is suppressed, so sticking the od size in bd
628 // And of course the expression has to be copied to
629 // AnBEXPR instead of AnEXPR. Yay. :-/
634 AnBEXPR[i] = AnEXPR[i];
637 while (AnEXPR[i] != 'E');
642 AMn = MEMPOST + ea_PC;
644 // Defined, absolute values from $FFFF8000..$00007FFF get
645 // optimized to absolute short
646 if (CHECK_OPTS(OPT_020_DISP)
647 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
648 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
650 od_ea = EXT_IISPOSW; // Word outer displacement
651 AMn = MEMPOST + ea_PC;
654 warn("absolute value in outer displacement ranging $FFFF8000..$00007FFF optimised to absolute short");
659 // Check for final closing parenthesis
666 return error("Closing parenthesis missing on addressing mode");
671 if (*tok == ')') // ([bd,An/PC],Xn)
673 // od is non existent, get out of jail free card
674 AMn = MEMPOST + ea_PC; // let's say it's ([bd,An],Xn,od) with od=0 then
675 AnEXTEN |= EXT_IISNOIN; // No outer displacement
680 return error("comma expected");
682 tok++; // eat the comma
684 if ((*tok != CONST) && (*tok != SYMBOL))
687 expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM);
689 if (CHECK_OPTS(OPT_020_DISP) && (AnEXVAL == 0))
691 // od=0 so optimise it out
692 AMn = MEMPOST + ea_PC; // let's say it's ([bd,An],Xn,od) with od=0 then
693 AnEXTEN |= EXT_IISNOIN; // No outer displacement
698 // ([bd,An/PC],Xn,od)
703 AMn = MEMPOST + ea_PC;
704 AnEXTEN |= EXT_IISNOIL; // Long outer displacement with IS suppressed
709 AnEXTEN |= EXT_IISNOIW; // Word outer displacement with IS suppressed
710 AMn = MEMPRE + ea_PC;;
714 //AnEXTEN|=EXT_IISNOIW; // Word outer displacement
715 AMn = MEMPOST + ea_PC;
718 // Defined, absolute values from $FFFF8000..$00007FFF get
719 // optimized to absolute short
720 else if (CHECK_OPTS(OPT_020_DISP)
721 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
722 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
724 //AnEXTEN|=EXT_IISNOIW; // Word outer displacement with IS suppressed
726 warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
730 // Check for final closing parenthesis
737 return error("Closing parenthesis missing on addressing mode");
739 else if (*tok == ',')
741 tok++; // ([bd,An,Xn.size*scale],od)
744 if ((*tok >= KW_A0) && (*tok <= KW_A7))
746 AnEXTEN |= ((*tok & 7) << 12);
750 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
752 AnEXTEN |= ((*tok & 7) << 12);
758 // ([bd,An/PC],Xn.W/L...)
761 // Index reg size: <empty> | .W | .L
772 // .B not allowed here...
777 if (*tok == '*') // ([bd,An/PC],Xn*...)
778 { // scale: *1, *2, *4, *8
783 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
784 return error("scale factor expression must evaluate");
803 else if (*tok++ != CONST)
827 tok++; // Take into account that constants are 64-bit
833 return error("Expected closing bracket ]");
834 tok++; // Eat the bracket
837 if (*tok == ')') // ([bd,An/PC,Xn]...
839 // od is non existent, get out of jail free card
840 AMn = MEMPRE + ea_PC; // let's say it's ([bd,An,Xn],od) with od suppressed then
841 AnEXTEN |= EXT_IISPREN; // No outer displacement
845 else if (*tok++ != ',')
846 return error("comma expected after ]");
848 if (*tok == SYMBOL || *tok == CONST)
850 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
853 if (CHECK_OPTS(OPT_020_DISP) && (AnEXVAL == 0) && (AnEXATTR & DEFINED))
855 // od=0 so optimise it out
856 AMn = MEMPRE + ea_PC; // let's say it's ([bd,An],Xn,od) with od=0 then
857 AnEXTEN |= EXT_IISPRE0; // No outer displacement
863 // ([bd,An/PC,Xn],od)
867 AMn = MEMPRE + ea_PC;
869 AnEXTEN |= EXT_IISPREL;
874 AMn = MEMPRE + ea_PC;
875 int expr_size = EXT_IISPREW; // Assume we have a .w value
877 if ((AnEXVAL + 0x8000) > 0x10000)
879 // Long value, so mark it as such for now
880 expr_size = EXT_IISPREL;
882 // Defined, absolute values from $FFFF8000..$00007FFF
883 // get optimized to absolute short
884 if (CHECK_OPTS(OPT_020_DISP)
885 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
886 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
888 expr_size = EXT_IISPREW;
891 warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
895 AnEXTEN |= expr_size; // Assume we have a .w value
897 // Is .W forced here?
902 if (expr_size == EXT_IISPREL)
903 return error("outer displacement value does not fit in .w size");
907 // Check for final closing parenthesis
914 return error("Closing parenthesis missing on addressing mode");
922 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
925 // It could be that this is really just an expression prefixing a
926 // register as a displacement...
933 // Otherwise, check for PC & etc displacements...
937 if ((*tok >= KW_A0) && (*tok <= KW_A7))
944 // Check if we're actually doing d8(An,Dn) or
945 // (d16,An,Dn[.size][*scale])
946 // TODO: not a very clear cut case from what I can think.
947 // The only way to distinguish between the two is to check
948 // AnEXVAL and see if it's >127 or <-128. But this doesn't
949 // work if AnEXVAL isn't defined yet. For now we fall
950 // through to d8(An,Dn) but this might bite us in the arse
952 if ((AnEXATTR & DEFINED) && (AnEXVAL + 0x80 > 0x100))
954 // We're going to treat it as a full extension format
955 // with no indirect access and no base displacement/
956 // index register suppression
957 AnEXTEN |= EXT_FULLWORD; // Definitely using full extension format, so set bit 8
958 AnEXTEN |= EXT_IISPRE0; // No Memory Indirect Action
959 AnEXTEN |= EXT_BDSIZEL; // Base Displacement Size Long
960 tok++; // Get past the comma
962 // Our expression is techically a base displacement,
963 // so let's copy it to the relevant variables so
964 // eagen0.c can pick it up properly
966 AnBEXATTR = AnEXATTR;
968 if ((*tok >= KW_D0) && (*tok <= KW_D7))
970 AnEXTEN |= ((*tok++) & 7) << 12;
975 // Index reg size: <empty> | .W | .L
986 // .B not allowed here...
991 if (*tok == '*') // (d16,An,Dn[.size][*scale])
992 { // scale: *1, *2, *4, *8
997 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
998 return error("scale factor expression must evaluate");
1017 else if (*tok++ != CONST)
1021 switch ((int)*tok++)
1038 tok++; // Take into account that constants are 64-bit
1043 return error("Closing parenthesis missing on addressing mode");
1045 // Let's say that this is the closest to our case
1056 else if (*tok == ')')
1065 else if (*tok == KW_PC)
1072 else if (*tok == ')')
1074 AMn = PCDISP; // expr(PC)
1085 else if (*tok == '-' && tok[1] == '(' && ((tok[2] >= KW_A0) && (tok[2] <= KW_A7)) && tok[3] == ')')
1091 else if (*tok == KW_CCR)
1097 else if (*tok == KW_SR)
1103 else if (*tok == KW_USP)
1107 AnREG = 2; // Added this for the case of USP used in movec (see CREGlut in mach.c). Hopefully nothing gets broken!
1110 else if ((*tok >= KW_IC40) && (*tok <= KW_BC40))
1113 AnREG = *tok++ - KW_IC40;
1115 // After a cache keyword only a comma or EOL is allowed
1116 if ((*tok != ',') && (*tok != EOL))
1120 else if ((*tok >= KW_SFC) && (*tok <= KW_CRP))
1123 AnREG = (*tok++) - KW_SFC;
1126 else if ((*tok >= KW_FP0) && (*tok <= KW_FP7))
1129 AnREG = (*tok++ & 7);
1131 else if ((*tok >= KW_FPIAR) && (*tok <= KW_FPCR))
1134 AnREG = (1 << ((*tok++) - KW_FPIAR + 10));
1145 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
1155 if (((AnEXATTR & (TDB | DEFINED)) == DEFINED) && (AnEXVAL < 0x10000))
1156 AnEXVAL = (int32_t)(int16_t)AnEXVAL; // Sign extend value
1160 else if (*tok != '(')
1165 // .L is forced here
1168 // When PC relative is enforced, check for any symbols that aren't
1169 // EQU'd, in this case it's an illegal mode
1170 if ((CHECK_OPTS(OPT_PC_RELATIVE)) && (AnEXATTR & (DEFINED | REFERENCED | EQUATED) == (DEFINED | REFERENCED)))
1171 return error("relocation not allowed when o10 is enabled9");
1177 // Defined, absolute values from $FFFF8000..$00007FFF get
1178 // optimized to absolute short
1179 if (CHECK_OPTS(OPT_ABS_SHORT)
1180 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
1181 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
1185 if (optim_warn_flag)
1186 warn("absolute value from $FFFF8000..$00007FFF optimised to absolute short");
1195 if ((*tok >= KW_A0) && (*tok <= KW_A7))
1209 else if (*tok == KW_PC)
1225 // Addressing mode OK
1230 // Clean up dirty little macros
1245 #undef CHK_FOR_DISPn
1252 #undef IS_SUPPRESSEDn