// RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
// EAGEN0.C - Effective Address Code Generation
// Generated Code for eaN (Included twice by "eagen.c")
-// Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends
+// Copyright (C) 199x Landon Dyer, 2017 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
//
int eaNgen(WORD siz)
{
- WORD w;
- VALUE v;
- WORD tdb;
-
- v = aNexval;
- w = (WORD)(aNexattr & DEFINED);
- tdb = (WORD)(aNexattr & TDB);
-
- switch(amN) {
- case DREG: // "Do nothing" - they're in the opword
- case AREG:
- case AIND:
- case APOSTINC:
- case APREDEC:
- case AM_USP:
- case AM_CCR:
- case AM_SR:
- case AM_NONE:
- break; // This is a performance hit, though
- case ADISP: // expr(An)
- if(w) { // Just deposit it
- if(tdb)
- rmark(cursect, sloc, tdb, MWORD, NULL);
- if(v + 0x8000 >= 0x18000)
- return(error(range_error));
- D_word(v);
- } else { // Arrange for fixup later on
- fixup(FU_WORD|FU_SEXT, sloc, aNexpr);
- D_word(0);
- }
- break;
- case PCDISP:
- if(w) { // Just deposit it
- if((aNexattr & TDB) == cursect)
- v -= (VALUE)sloc;
- else if((aNexattr & TDB) != ABS)
- error(rel_error);
-
- if(v + 0x8000 >= 0x10000)
- return(error(range_error));
- D_word(v);
- } else { // Arrange for fixup later on
- fixup(FU_WORD|FU_SEXT|FU_PCREL, sloc, aNexpr);
- D_word(0);
- }
- break;
- case AINDEXED:
- w = (WORD)((aNixreg << 12) | aNixsiz); // Compute ixreg and size+scale
- if(aNexattr & DEFINED) { // Deposit a byte...
- if(tdb)
- return(error(abs_error)); // Can't mark bytes
- if(v + 0x80 >= 0x180)
- return(error(range_error));
- w |= v & 0xff;
- D_word(w);
- } else { // Fixup the byte later
- fixup(FU_BYTE|FU_SEXT, sloc+1, aNexpr);
- D_word(w);
- }
- break;
- case PCINDEXED:
- w = (WORD)((aNixreg << 12) | aNixsiz); // Compute ixreg and size+scale
- if(aNexattr & DEFINED) { // Deposit a byte...
- if((aNexattr & TDB) == cursect)
- v -= (VALUE)sloc;
- else if((aNexattr & TDB) != ABS)
- error(rel_error);
-
- if(v + 0x80 >= 0x100)
- return(error(range_error));
- w |= v & 0xff;
- D_word(w);
- } else { // Fixup the byte later
- fixup(FU_WBYTE|FU_SEXT|FU_PCREL, sloc, aNexpr);
- D_word(w);
- }
- break;
- case IMMED:
- switch(siz) {
- case SIZB:
- if(w) {
- if(tdb)
- return(error("illegal byte-sized relative reference"));
- if(v + 0x100 >= 0x200)
- return(error(range_error));
- D_word(v);
- } else {
- fixup(FU_BYTE|FU_SEXT, sloc+1, aNexpr);
- D_word(0);
- }
- break;
- case SIZW:
- case SIZN:
- if(w) {
- if(tdb)
- rmark(cursect, sloc, tdb, MWORD, NULL);
- if(v + 0x10000 >= 0x20000)
- return(error(range_error));
- D_word(v);
- } else {
- fixup(FU_WORD|FU_SEXT, sloc, aNexpr);
- D_word(0);
- }
- break;
- case SIZL:
- if(w) {
- if(tdb)
- rmark(cursect, sloc, tdb, MLONG, NULL);
- D_long(v);
- } else {
- fixup(FU_LONG, sloc, aNexpr);
- D_long(0);
- }
- break;
- default:
- interror(1); // IMMED size problem
- }
- break;
- case ABSW:
- if(w) {
- if(tdb)
- rmark(cursect, sloc, tdb, MWORD, NULL);
- if(v + 0x8000 >= 0x10000)
- return(error(range_error));
- D_word(v);
- } else {
- fixup(FU_WORD|FU_SEXT, sloc, aNexpr);
- D_word(0);
- }
- break;
- case ABSL:
- if(w) {
- if(tdb)
- rmark(cursect, sloc, tdb, MLONG, NULL);
- D_long(v);
- } else {
- fixup(FU_LONG, sloc, aNexpr);
- D_long(0);
- }
- break;
- case ABASE:
- case MEMPOST:
- case MEMPRE:
- case PCBASE:
- case PCMPOST:
- case PCMPRE:
- return(error("unsupported 68020 addressing mode"));
- default:
- interror(3); // Bad addressing mode in ea gen
- }
-
- return(OK);
+ VALUE vbd, v = aNexval;
+ WORD wbd, w = (WORD)(aNexattr & DEFINED);
+ WORD tdbbd, tdb = (WORD)(aNexattr & TDB);
+ vbd = aNbdexval;
+ wbd = (WORD)(aNbdexattr & DEFINED);
+ tdbbd = (WORD)(aNbdexattr & TDB);
+
+ switch (amN)
+ {
+ // "Do nothing" - they're in the opword
+ case DREG:
+ case AREG:
+ case AIND:
+ case APOSTINC:
+ case APREDEC:
+ case AM_USP:
+ case AM_CCR:
+ case AM_SR:
+ case AM_NONE:
+ // This is a performance hit, though
+ break;
+ case ADISP:
+ // expr(An)
+ if (w)
+ {
+ // Just deposit it
+ if (tdb)
+ MarkRelocatable(cursect, sloc, tdb, MWORD, NULL);
+
+ if ((v == 0) && optim_flags[OPT_INDIRECT_DISP] && !movep)
+ {
+ // If expr is 0, size optimise the opcode. Generally the lower
+ // 6 bits of the opcode for expr(ax) are 101rrr where rrr=the
+ // number of the register, then followed by a word containing
+ // 'expr'. We need to change that to 010rrr.
+ if ((siz & 0x8000) == 0)
+ {
+ chptr_opcode[0] &= ((0xFFC7 >> 8) & 255); // mask off bits
+ chptr_opcode[1] &= 0xFFC7 & 255; // mask off bits
+ chptr_opcode[0] |= ((0x0010 >> 8) & 255); // slap in 010 bits
+ chptr_opcode[1] |= 0x0010 & 255; // slap in 010 bits
+ }
+ else
+ {
+ // Special case for move ea,ea: there are two ea fields
+ // there and we get a signal if it's the second ea field
+ // from m_ea - siz's 16th bit is set
+ chptr_opcode[0] &= ((0xFE3F >> 8) & 255); // mask off bits
+ chptr_opcode[1] &= 0xFE3F & 255; // mask off bits
+ chptr_opcode[0] |= ((0x0080 >> 8) & 255); // slap in 010 bits
+ chptr_opcode[1] |= 0x0080 & 255; // slap in 010 bits
+ }
+
+ if (sbra_flag)
+ warn("0(An) converted to (An)");
+
+ return OK;
+ }
+
+ if ((v + 0x8000) >= 0x18000)
+ return error(range_error);
+
+ D_word(v);
+ }
+ else
+ {
+ // Arrange for fixup later on
+ AddFixup(FU_WORD | FU_SEXT, sloc, aNexpr);
+ D_word(0);
+ }
+
+ break;
+ case PCDISP:
+ if (w)
+ {
+ // Just deposit it
+ if ((aNexattr & TDB) == cursect)
+ v -= (VALUE)sloc;
+ else if ((aNexattr & TDB) != ABS)
+ error(rel_error);
+
+ if (v + 0x8000 >= 0x10000)
+ return error(range_error);
+
+ D_word(v);
+ }
+ else
+ {
+ // Arrange for fixup later on
+ AddFixup(FU_WORD | FU_SEXT | FU_PCREL, sloc, aNexpr);
+ D_word(0);
+ }
+
+ break;
+ case AINDEXED:
+ // Compute ixreg and size+scale
+ w = (WORD)((aNixreg << 12) | aNixsiz);
+
+ if (aNexattr & DEFINED)
+ {
+ // Deposit a byte...
+ if (tdb)
+ // Can't mark bytes
+ return error(abs_error);
+
+ if (v + 0x80 >= 0x180)
+ return error(range_error);
+
+ w |= v & 0xFF;
+ D_word(w);
+ }
+ else
+ {
+ // Fixup the byte later
+ AddFixup(FU_BYTE | FU_SEXT, sloc + 1, aNexpr);
+ D_word(w);
+ }
+
+ break;
+ case PCINDEXED:
+ // Compute ixreg and size+scale
+ w = (WORD)((aNixreg << 12) | aNixsiz);
+
+ if (aNexattr & DEFINED)
+ {
+ // Deposit a byte...
+ if ((aNexattr & TDB) == cursect)
+ v -= (VALUE)sloc;
+ else if ((aNexattr & TDB) != ABS)
+ error(rel_error);
+
+ if (v + 0x80 >= 0x100)
+ return error(range_error);
+
+ w |= v & 0xFF;
+ D_word(w);
+ }
+ else
+ {
+ // Fixup the byte later
+ AddFixup(FU_WBYTE | FU_SEXT | FU_PCREL, sloc, aNexpr);
+ D_word(w);
+ }
+
+ break;
+ case IMMED:
+ switch (siz)
+ {
+ case SIZB:
+ if (w)
+ {
+ if (tdb)
+ return error("illegal byte-sized relative reference");
+
+ if (v + 0x100 >= 0x200)
+ return error(range_error);
+
+ D_word(v);
+ }
+ else
+ {
+ AddFixup(FU_BYTE | FU_SEXT, sloc + 1, aNexpr);
+ D_word(0);
+ }
+
+ break;
+ case SIZW:
+ case SIZN:
+ if (w)
+ {
+ if (v + 0x10000 >= 0x20000)
+ return error(range_error);
+
+ if (tdb)
+ MarkRelocatable(cursect, sloc, tdb, MWORD, NULL);
+
+ D_word(v);
+ }
+ else
+ {
+ AddFixup(FU_WORD | FU_SEXT, sloc, aNexpr);
+ D_word(0);
+ }
+
+ break;
+ case SIZL:
+ if (w)
+ {
+ if (tdb)
+ MarkRelocatable(cursect, sloc, tdb, MLONG, NULL);
+
+ D_long(v);
+ }
+ else
+ {
+ AddFixup(FU_LONG, sloc, aNexpr);
+ D_long(0);
+ }
+
+ break;
+ default:
+ // IMMED size problem
+ interror(1);
+ }
+
+ break;
+ case SIZP:
+ // 68881/68882/68040 only
+ return error("Sorry, .p constant format is not implemented yet!");
+ break;
+ case ABSW:
+ if (w) // Defined
+ {
+ if (tdb)
+ MarkRelocatable(cursect, sloc, tdb, MWORD, NULL);
+
+ if (v + 0x8000 >= 0x10000)
+ return error(range_error);
+
+ D_word(v);
+ }
+ else
+ {
+ AddFixup(FU_WORD | FU_SEXT, sloc, aNexpr);
+ D_word(0);
+ }
+
+ break;
+ case ABSL:
+ if (w) // Defined
+ {
+ if (tdb)
+ MarkRelocatable(cursect, sloc, tdb, MLONG, NULL);
+
+ D_long(v);
+ }
+ else
+ {
+ AddFixup(FU_LONG, sloc, aNexpr);
+ D_long(0);
+ }
+
+ break;
+ case ABASE:
+ case MEMPOST:
+ case MEMPRE:
+ case PCBASE:
+ case PCMPOST:
+ case PCMPRE:
+ D_word(aNexten);
+ // Deposit bd (if not suppressed)
+ if ((aNexten&0x0030)==EXT_BDSIZE0)
+ {
+ // Don't deposit anything (suppressed)
+ }
+ else if ((aNexten&0x0030)==EXT_BDSIZEW)
+ {
+ // Deposit word bd
+ if (wbd)
+ {
+ // Just deposit it
+ if (tdb)
+ MarkRelocatable(cursect, sloc, tdbbd, MWORD, NULL);
+
+ if (vbd + 0x8000 >= 0x10000)
+ return error(range_error);
+
+ D_word(vbd);
+ }
+ else
+ {
+ // Arrange for fixup later on
+ AddFixup(FU_WORD|FU_SEXT, sloc, aNexpr);
+ D_word(0);
+ }
+ }
+ else
+ {
+ // Deposit long bd
+ if (wbd)
+ {
+ // Just deposit it
+ if (tdbbd)
+ MarkRelocatable(cursect, sloc, tdbbd, MLONG, NULL);
+
+ D_long(vbd);
+ }
+ else
+ {
+ // Arrange for fixup later on
+ AddFixup(FU_LONG|FU_SEXT, sloc, aNexpr);
+ D_long(0);
+ }
+ }
+ // Deposit od (if not suppressed)
+ if ((aNexten&7)==EXT_IISPRE0 || (aNexten&7)==EXT_IISPREN
+ || (aNexten&7)==EXT_IISNOIN || (aNexten&7)==EXT_IISPOSN)
+ {
+ // Don't deposit anything (suppressed)
+ }
+ else if ((aNexten&7)==EXT_IISPREW
+ || (aNexten&7)==EXT_IISPOSW || (aNexten&7)==EXT_IISNOIW)
+ {
+ // Deposit word od
+ if (w)
+ {
+ // Just deposit it
+ if (tdb)
+ MarkRelocatable(cursect, sloc, tdb, MWORD, NULL);
+
+ if (v + 0x8000 >= 0x10000)
+ return error(range_error);
+
+ D_word(v);
+ }
+ else
+ {
+ // Arrange for fixup later on
+ AddFixup(FU_WORD|FU_SEXT, sloc, aNexpr);
+ D_word(0);
+ }
+ }
+ else
+ {
+ // Deposit long od
+ if (w)
+ {
+ // Just deposit it
+ if (tdb)
+ MarkRelocatable(cursect, sloc, tdb, MLONG, NULL);
+
+ D_long(v);
+ }
+ else
+ {
+ // Arrange for fixup later on
+ AddFixup(FU_LONG|FU_SEXT, sloc, aNexpr);
+ D_long(0);
+ }
+ }
+
+ break;
+ //return error("unsupported 68020 addressing mode");
+ default:
+ // Bad addressing mode in ea gen
+ interror(3);
+ }
+
+ return OK;
}
// Undefine dirty macros
#undef aNexpr
#undef aNixreg
#undef aNixsiz
+#undef aNexten
+#undef aNbdexval
+#undef aNbdexattr
+#undef AnESYM
+
projects / rmac / blobdiff