//
-// RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
+// RMAC - Renamed Macro Assembler for all Atari computers
// PARMODE.C - Addressing Modes Parser Include
-// Copyright (C) 199x Landon Dyer, 2017 Reboot and Friends
+// Copyright (C) 199x Landon Dyer, 2011-2021 Reboot and Friends
// RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
// Source utilised with the kind permission of Landon Dyer
//
// This file is included (twice) to parse two addressing modes, into slightly
// different var names
{
+ 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))
+ if ((*tok >= REG68_D0) && (*tok <= REG68_D7))
{
AMn = DREG;
AnREG = *tok++ & 7;
}
- else if ((*tok >= KW_A0) && (*tok <= KW_A7))
+ else if ((*tok >= REG68_A0) && (*tok <= REG68_A7))
{
AMn = AREG;
AnREG = *tok++ & 7;
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])
// (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)
+ // ([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))
+ if ((*tok >= REG68_A0) && (*tok <= REG68_A7))
{
AnREG = *tok++ & 7;
AMn = AINDEXED;
goto AMn_IX0; // Handle ",Xn[.siz][*scale])"
}
- else if (*tok == KW_PC)
+ else if ((*tok >= REG68_D0) && (*tok <= REG68_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 == REG68_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
+AMn_IX0: // Handle indexed with missing expr
AnEXVAL = 0;
AnEXATTR = ABS | DEFINED;
- AMn_IXN: // Handle any indexed (tok -> a comma)
+AMn_IXN: // Handle any indexed (tok -> a comma)
if (*tok++ != ',')
goto badmode;
- if (*tok < KW_D0 || *tok > KW_A7)
+ if (*tok < REG68_D0 || *tok > REG68_A7)
goto badmode;
AnIXREG = *tok++ & 15;
{ // scale: *1, *2, *4, *8
tok++;
- if (*tok++ != CONST || *tok > 8)
+ 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;
+ }
- switch ((int)*tok++)
+ 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))
{
- case 1:
+ // 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("o5: 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 == REG68_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 >= REG68_A0) && (*tok <= REG68_A7))
+ { // ([bd,An,...
+ AnREG = (6 << 3) | (*tok & 7);
+ tok++;
+ }
+ else if ((*tok >= REG68_D0) && (*tok <= REG68_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 2:
- AnIXSIZ |= TIMES2;
+ case DOTL:
+ AnEXTEN |= EXT_L;
+ tok++;
break;
- case 4:
- AnIXSIZ |= TIMES4;
+ 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 >= REG68_A0) && (*tok <= REG68_A7))
+ {
+ AnIXREG = ((*tok & 7) << 12);
+ AnEXTEN |= EXT_A;
+ tok++;
+ }
+ else if ((*tok >= REG68_D0) && (*tok <= REG68_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 8:
- AnIXSIZ |= TIMES8;
+ 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("o5: 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("o5: 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)
- if (*tok++ != ')') // final ")"
+ // Check for Xn
+ if ((*tok >= REG68_A0) && (*tok <= REG68_A7))
+ {
+ AnEXTEN |= ((*tok & 7) << 12);
+ AnEXTEN |= EXT_A;
+ tok++;
+ }
+ else if ((*tok >= REG68_D0) && (*tok <= REG68_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;
+ }
- goto AnOK;
- }
- else if (*tok == '[')
- { // ([...
- goto unmode;
+ // 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("o5: 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...
+ {
+ // (expr...
+ // We have an aliasing problem here, because a couple of differenct cases end up here:
+ // (a0), 0(a0,d0), (-288,a0,d0.l) can be easily detected and parsed.
+ // But what about (160*150)+4(A1)? With the old scheme, i.e. skip past the left parenthesis and try to parse the inside
+ // tokens will only parse (160*150) and everything else is assumed that it's part of the ea, i.e. +4(a1). This would produce
+ // an error since the parser would expect (a1). The way to work around this used to be to wrap all the displacement in
+ // parenthesis, ((160*150)+4)(a1). But that's something the user really doesn't want to think about.
+ // What we can do is to peek ahead in the token stream and see if we have something that reminds of an expression
+ // (i.e. no register tokens or commas) until we hit an open parenthesis plus a register (parenthesis balance during the scan
+ // has to be maintained of course, otherwise we might be led into false conclusions).
+ TOKEN *look_ahead = tok;
+ int parenthesis_level = 1; // We count the opening parenthesis so we're not at level 0
+ int this_is_an_expression = 0;
+ while (1)
+ {
+ if (*look_ahead == EOL)
+ {
+ // Something really bad happened, abort
+ return error("reached end of line while parsing expression");
+ }
+ if (*look_ahead == '(')
+ {
+ if (parenthesis_level == 0)
+ {
+ if (look_ahead[1] == EOL)
+ {
+ return error("reached end of line while parsing expression");
+ }
+ if ((look_ahead[1] >= REG68_A0 && look_ahead[1] <= REG68_A7) || look_ahead[1] == REG68_PC)
+ {
+ tok--; // Rewind token pointer to start of parenthesis
+ this_is_an_expression = 1;
+ break;
+ }
+ }
+ parenthesis_level++;
+ look_ahead++;
+ continue;
+ }
+ if (*look_ahead == ',' || (*look_ahead >= REG68_A0 && *look_ahead <= REG68_A7))
+ {
+ // Nope, this is a different case, abort
+ break;
+ }
+ if (*look_ahead == ')')
+ {
+ parenthesis_level--;
+ if (parenthesis_level < 0) return error("unbalanced parenthesis in expression");
+ look_ahead++;
+ continue;
+ }
+ if (*look_ahead == ACONST||*look_ahead==FCONST)
+ {
+ look_ahead += 3; // Skip all the data associated with ACONST
+ continue;
+ }
+
+ look_ahead++;
+ }
+
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 == ')')
+ if (*tok == '(')
{
- tok++;
goto CHK_FOR_DISPn;
}
if (*tok++ != ',')
goto badmode;
- if ((*tok >= KW_A0) && (*tok <= KW_A7))
+ if ((*tok >= REG68_A0) && (*tok <= REG68_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 >= REG68_D0) && (*tok <= REG68_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
goto badmode;
}
- else if (*tok == KW_PC)
+ else if (*tok == REG68_PC)
{
if (*++tok == ',')
{ // expr(PC,Xn...)
goto badmode;
}
}
- else if (*tok == '-' && tok[1] == '(' && ((tok[2] >= KW_A0) && (tok[2] <= KW_A7)) && tok[3] == ')')
+ else if (*tok == '-' && tok[1] == '(' && ((tok[2] >= REG68_A0) && (tok[2] <= REG68_A7)) && tok[3] == ')')
{
AMn = APREDEC;
AnREG = tok[2] & 7;
tok += 4;
}
- else if (*tok == KW_CCR)
+ else if (*tok == REG68_CCR)
{
AMn = AM_CCR;
tok++;
goto AnOK;
}
- else if (*tok == KW_SR)
+ else if (*tok == REG68_SR)
{
AMn = AM_SR;
tok++;
goto AnOK;
}
- else if (*tok == KW_USP)
+ else if (*tok == REG68_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 >= REG68_IC40) && (*tok <= REG68_BC40))
+ {
+ AMn = CACHES;
+ AnREG = *tok++ - REG68_IC40;
+
+ // After a cache keyword only a comma or EOL is allowed
+ if ((*tok != ',') && (*tok != EOL))
+ return ERROR;
+ goto AnOK;
+ }
+ else if ((*tok >= REG68_SFC) && (*tok <= REG68_CRP))
+ {
+ AMn = CREG;
+ AnREG = (*tok++) - REG68_SFC;
+ goto AnOK;
+ }
+ else if ((*tok >= REG68_FP0) && (*tok <= REG68_FP7))
+ {
+ AMn = FREG;
+ AnREG = (*tok++ & 7);
+ }
+ else if ((*tok >= REG68_FPIAR) && (*tok <= REG68_FPCR))
+ {
+ AMn = FPSCR;
+ AnREG = (1 << ((*tok++) - REG68_FPIAR + 10));
+ }
// expr
// expr.w
// expr.l
tok++;
AMn = ABSW;
- if ((AnEXATTR & (TDB|DEFINED)) == DEFINED && (AnEXVAL < 0x10000))
+ if (((AnEXATTR & (TDB | DEFINED)) == DEFINED) && (AnEXVAL < 0x10000))
AnEXVAL = (int32_t)(int16_t)AnEXVAL; // Sign extend value
goto AnOK;
// expr[.L]
AMn = ABSL;
- // Defined, absolute values from $FFFF8000..$00007FFF get optimized
- // to absolute short
- if (optim_flags[OPT_ABS_SHORT] && (AnEXATTR & (TDB|DEFINED)) == DEFINED && (AnEXVAL + 0x8000) < 0x10000)
+ // .L is forced here
+ if (*tok == DOTL)
{
- AMn = ABSW;
+ // 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 & (DEFINED | REFERENCED | EQUATED)) == (DEFINED | REFERENCED)))
+ return error("relocation not allowed when o30 is enabled");
- if (sbra_flag)
- warn("absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+ tok++;
}
-
- // Is .L forced here?
- if (*tok == DOTL)
+ else
{
- tok++;
- AMn = ABSL;
+ // 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("o0: absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+ }
}
goto AnOK;
tok++;
- if ((*tok >= KW_A0) && (*tok <= KW_A7))
+ if ((*tok >= REG68_A0) && (*tok <= REG68_A7))
{
AnREG = *tok++ & 7;
AMn = AINDEXED;
goto AMn_IXN;
}
- else if (*tok == KW_PC)
+ else if (*tok == REG68_PC)
{
if (*++tok == ')')
{
AMn = PCINDEXED;
goto AMn_IXN;
}
+
goto badmode;
}
// Addressing mode OK
-
- AnOK:
+AnOK:
;
}
#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
projects / rmac / blobdiff