2 // RMAC - Reboot's Macro Assembler for all Atari computers
3 // EAGEN0.C - Effective Address Code Generation
4 // Generated Code for eaN (Included twice by "eagen.c")
5 // Copyright (C) 199x Landon Dyer, 2011-2019 Reboot and Friends
6 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
7 // Source utilised with the kind permission of Landon Dyer
12 uint32_t vbd, v = (uint32_t)aNexval;
13 WORD wbd, w = (WORD)(aNexattr & DEFINED);
14 WORD tdbbd, tdb = (WORD)(aNexattr & TDB);
15 vbd = (uint32_t)aNbdexval;
16 wbd = (WORD)(aNbdexattr & DEFINED);
17 tdbbd = (WORD)(aNbdexattr & TDB);
22 // "Do nothing" - they're in the opword
32 // This is a performance hit, though
40 MarkRelocatable(cursect, sloc, tdb, MWORD, NULL);
42 if ((v == 0) && CHECK_OPTS(OPT_INDIRECT_DISP) && !movep)
44 // If expr is 0, size optimise the opcode. Generally the lower
45 // 6 bits of the opcode for expr(ax) are 101rrr where rrr=the
46 // number of the register, then followed by a word containing
47 // 'expr'. We need to change that to 010rrr.
48 if ((siz & 0x8000) == 0)
50 chptr_opcode[0] &= ((0xFFC7 >> 8) & 255); // mask off bits
51 chptr_opcode[1] &= 0xFFC7 & 255; // mask off bits
52 chptr_opcode[0] |= ((0x0010 >> 8) & 255); // slap in 010 bits
53 chptr_opcode[1] |= 0x0010 & 255; // slap in 010 bits
57 // Special case for move ea,ea: there are two ea fields
58 // there and we get a signal if it's the second ea field
59 // from m_ea - siz's 16th bit is set
60 chptr_opcode[0] &= ((0xFE3F >> 8) & 255); // mask off bits
61 chptr_opcode[1] &= 0xFE3F & 255; // mask off bits
62 chptr_opcode[0] |= ((0x0080 >> 8) & 255); // slap in 010 bits
63 chptr_opcode[1] |= 0x0080 & 255; // slap in 010 bits
67 warn("0(An) converted to (An)");
72 if ((v + 0x8000) >= 0x18000)
73 return error(range_error);
79 // Arrange for fixup later on
80 AddFixup(FU_WORD | FU_SEXT, sloc, aNexpr);
89 if ((aNexattr & TDB) == cursect)
91 else if ((aNexattr & TDB) != ABS)
94 if (v + 0x8000 >= 0x10000)
95 return error(range_error);
101 // Arrange for fixup later on
102 AddFixup(FU_WORD | FU_SEXT | FU_PCREL, sloc, aNexpr);
108 // Compute ixreg and size+scale
109 w = (WORD)((aNixreg << 12) | aNixsiz);
111 if (aNexattr & DEFINED)
116 return error(abs_error);
118 if (v + 0x80 >= 0x180)
119 return error(range_error);
126 // Fixup the byte later
127 AddFixup(FU_BYTE | FU_SEXT, sloc + 1, aNexpr);
133 // Compute ixreg and size+scale
134 w = (WORD)((aNixreg << 12) | aNixsiz);
136 if (aNexattr & DEFINED)
139 if ((aNexattr & TDB) == cursect)
141 else if ((aNexattr & TDB) != ABS)
144 if (v + 0x80 >= 0x100)
145 return error(range_error);
152 // Fixup the byte later
153 AddFixup(FU_WBYTE | FU_SEXT | FU_PCREL, sloc, aNexpr);
165 return error("illegal byte-sized relative reference");
167 if (v + 0x100 >= 0x200)
168 return error(range_error);
174 AddFixup(FU_BYTE | FU_SEXT, sloc + 1, aNexpr);
183 if (v + 0x10000 >= 0x20000)
184 return error(range_error);
187 MarkRelocatable(cursect, sloc, tdb, MWORD, NULL);
193 AddFixup(FU_WORD | FU_SEXT, sloc, aNexpr);
202 MarkRelocatable(cursect, sloc, tdb, MLONG, NULL);
208 AddFixup(FU_LONG, sloc, aNexpr);
214 // 68881/68882/68040 only
217 //Would a floating point value *ever* need to be fixed up as if it were an address? :-P
219 // MarkRelocatable(cursect, sloc, tdb, MSINGLE, NULL);
221 // The value passed back from expr() is an internal C double;
222 // so we have to access it as such then convert it to an
223 // IEEE-754 float so we can store it as such in the instruction
227 float f = (float)*p.dp;
228 uint32_t ieee754 = FloatToIEEE754(f);
233 AddFixup(FU_FLOATSING, sloc, aNexpr);
234 D_long(0); // IEEE-754 zero is all zeroes
239 // 68881/68882/68040 only
242 //Would a floating point value *ever* need to be fixed up as if it were an address? :-P
244 // MarkRelocatable(cursect, sloc, tdb, MDOUBLE, NULL);
249 uint64_t ieee754 = DoubleToIEEE754(d);
254 AddFixup(FU_FLOATDOUB, sloc, aNexpr);
255 D_quad(0LL); // IEEE-754 zero is all zeroes
260 // 68881/68882/68040 only
263 //Would a floating point value *ever* need to be fixed up as if it were an address? :-P
265 // MarkRelocatable(cursect, sloc, tdb, MEXTEND, NULL);
269 DoubleToExtended(*p.dp, extDbl);
274 AddFixup(FU_FLOATDOUB, sloc, aNexpr);
275 memset(extDbl, 0, 12);
281 // IMMED size problem
287 // 68881/68882/68040 only
288 return error("Sorry, .p constant format is not implemented yet!");
294 MarkRelocatable(cursect, sloc, tdb, MWORD, NULL);
296 if (v + 0x8000 >= 0x10000)
297 return error(range_error);
303 AddFixup(FU_WORD | FU_SEXT, sloc, aNexpr);
312 MarkRelocatable(cursect, sloc, tdb, MLONG, NULL);
318 AddFixup(FU_LONG, sloc, aNexpr);
324 D_word((0x190 | (aNixreg << 12)));
327 D_word((0x990 | (aNixreg << 12)));
336 // Deposit bd (if not suppressed)
337 if ((aNexten & 0x0030) == EXT_BDSIZE0)
339 // Don't deposit anything (suppressed)
341 else if ((aNexten & 0x0030) == EXT_BDSIZEW)
348 MarkRelocatable(cursect, sloc, tdbbd, MWORD, NULL);
350 if (vbd + 0x8000 >= 0x10000)
351 return error(range_error);
357 // Arrange for fixup later on
358 AddFixup(FU_WORD | FU_SEXT, sloc, aNbexpr);
369 MarkRelocatable(cursect, sloc, tdbbd, MLONG, NULL);
375 // Arrange for fixup later on
376 AddFixup(FU_LONG, sloc, aNbexpr);
380 // Deposit od (if not suppressed)
381 if ((aNexten & 7) == EXT_IISPRE0 || (aNexten & 7) == EXT_IISPREN
382 || (aNexten & 7) == EXT_IISNOIN || (aNexten & 7) == EXT_IISPOSN)
384 // Don't deposit anything (suppressed)
386 else if ((aNexten & 7) == EXT_IISPREW
387 || (aNexten & 7) == EXT_IISPOSW || (aNexten & 7) == EXT_IISNOIW)
394 MarkRelocatable(cursect, sloc, tdb, MWORD, NULL);
396 if (v + 0x8000 >= 0x10000)
397 return error(range_error);
403 // Arrange for fixup later on
404 AddFixup(FU_WORD | FU_SEXT, sloc, aNexpr);
415 MarkRelocatable(cursect, sloc, tdb, MLONG, NULL);
421 // Arrange for fixup later on
422 AddFixup(FU_LONG | FU_SEXT, sloc, aNexpr);
428 //return error("unsupported 68020 addressing mode");
430 // Bad addressing mode in ea gen
437 // Undefine dirty macros