X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?p=rmac;a=blobdiff_plain;f=eagen0.c;h=1d94c077cf49b8d7424f9ba1b5447daca78f2642;hp=62e686c144859631a44d8f5026a84e9828d16300;hb=4205233c8397c581b4d27ab36ab81ec896ef3dd0;hpb=582df8950c285e1746d0c4a9e3ead6545c962dc8 diff --git a/eagen0.c b/eagen0.c index 62e686c..1d94c07 100644 --- a/eagen0.c +++ b/eagen0.c @@ -2,19 +2,20 @@ // RMAC - Reboot's Macro Assembler for all Atari computers // EAGEN0.C - Effective Address Code Generation // Generated Code for eaN (Included twice by "eagen.c") -// Copyright (C) 199x Landon Dyer, 2011-2017 Reboot and Friends +// Copyright (C) 199x Landon Dyer, 2011-2020 Reboot and Friends // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986 // Source utilised with the kind permission of Landon Dyer // int eaNgen(WORD siz) { - uint32_t vbd, v = (uint32_t)aNexval; - WORD wbd, w = (WORD)(aNexattr & DEFINED); - WORD tdbbd, tdb = (WORD)(aNexattr & TDB); - vbd = (uint32_t)aNbdexval; - wbd = (WORD)(aNbdexattr & DEFINED); - tdbbd = (WORD)(aNbdexattr & TDB); + uint32_t v = (uint32_t)aNexval; + WORD w = (WORD)(aNexattr & DEFINED); + WORD tdb = (WORD)(aNexattr & TDB); + uint32_t vbd = (uint32_t)aNbdexval; + WORD wbd = (WORD)(aNbdexattr & DEFINED); + WORD tdbbd = (WORD)(aNbdexattr & TDB); + uint8_t extDbl[12]; switch (amN) { @@ -30,6 +31,7 @@ int eaNgen(WORD siz) case AM_NONE: // This is a performance hit, though break; + case ADISP: // expr(An) if (w) @@ -81,6 +83,7 @@ int eaNgen(WORD siz) } break; + case PCDISP: if (w) { @@ -103,6 +106,7 @@ int eaNgen(WORD siz) } break; + case AINDEXED: // Compute ixreg and size+scale w = (WORD)((aNixreg << 12) | aNixsiz); @@ -128,6 +132,7 @@ int eaNgen(WORD siz) } break; + case PCINDEXED: // Compute ixreg and size+scale w = (WORD)((aNixreg << 12) | aNixsiz); @@ -154,6 +159,7 @@ int eaNgen(WORD siz) } break; + case IMMED: switch (siz) { @@ -166,7 +172,7 @@ int eaNgen(WORD siz) if (v + 0x100 >= 0x200) return error(range_error); - D_word(v); + D_word(v & 0xFF); } else { @@ -175,6 +181,7 @@ int eaNgen(WORD siz) } break; + case SIZW: case SIZN: if (w) @@ -194,6 +201,7 @@ int eaNgen(WORD siz) } break; + case SIZL: if (w) { @@ -209,90 +217,93 @@ int eaNgen(WORD siz) } break; + case SIZS: // 68881/68882/68040 only if (w) { - float vv; - if (tdb) - MarkRelocatable(cursect, sloc, tdb, MSINGLE, NULL); - - vv = (float)v; - - D_single(vv); +//Would a floating point value *ever* need to be fixed up as if it were an address? :-P +// if (tdb) +// MarkRelocatable(cursect, sloc, tdb, MSINGLE, NULL); + + // The value passed back from expr() is an internal C double; + // so we have to access it as such then convert it to an + // IEEE-754 float so we can store it as such in the instruction + // stream here. + PTR p; + p.u64 = &aNexval; + float f = (float)*p.dp; + uint32_t ieee754 = FloatToIEEE754(f); + D_long(ieee754); } else { - float vv = 0; AddFixup(FU_FLOATSING, sloc, aNexpr); - - D_single(vv); + D_long(0); // IEEE-754 zero is all zeroes } break; + case SIZD: // 68881/68882/68040 only if (w) { - double vv; - unsigned long long vvv; - if (tdb) - MarkRelocatable(cursect, sloc, tdb, MDOUBLE, NULL); - - // We want to store the IEE754 float into ram from a generic - // 32-bit int. First, convert it to double float, then cast - // that to 64-bit, then convert to big endian (if needed) - // and then store it (phew!) - vv = *(float *)&aNexval; - vvv = BYTESWAP64(*(unsigned long long *)&vv); - - D_double(vvv); +//Would a floating point value *ever* need to be fixed up as if it were an address? :-P +// if (tdb) +// MarkRelocatable(cursect, sloc, tdb, MDOUBLE, NULL); + + PTR p; + p.u64 = &aNexval; + double d = *p.dp; + uint64_t ieee754 = DoubleToIEEE754(d); + D_quad(ieee754); } else { - unsigned long long vvv = 0; AddFixup(FU_FLOATDOUB, sloc, aNexpr); - - D_double(vvv); + D_quad(0LL); // IEEE-754 zero is all zeroes } break; + case SIZX: // 68881/68882/68040 only if (w) { - long double vv; - if (tdb) - MarkRelocatable(cursect, sloc, tdb, MEXTEND, NULL); - - // We want to store the IEE754 float into ram from a generic - // 32-bit int. First, convert it to double float, then cast - // that to 96-bit, then convert to big endian (if needed) - // and then store it (phew!) - vv = (double)aNexval; - - //*chptr++ = (char)((*(unsigned long long *)&vv) >> 32) | 0x80 /* assume that the number is normalised */; - D_extend(vv); +//Would a floating point value *ever* need to be fixed up as if it were an address? :-P +// if (tdb) +// MarkRelocatable(cursect, sloc, tdb, MEXTEND, NULL); + + PTR p; + p.u64 = &aNexval; + DoubleToExtended(*p.dp, extDbl); + D_extend(extDbl); } else { - long double vvv = 0; + // Why would this be anything other than a floating point + // expression??? Even if there were an undefined symbol in + // the expression, how would that be relevant? I can't see + // any use case where this would make sense. AddFixup(FU_FLOATDOUB, sloc, aNexpr); - - D_extend(vvv); + memset(extDbl, 0, 12); + D_extend(extDbl); } 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 { @@ -311,6 +322,7 @@ int eaNgen(WORD siz) } break; + case ABSL: if (w) // Defined { @@ -326,12 +338,15 @@ int eaNgen(WORD siz) } break; + case DINDW: D_word((0x190 | (aNixreg << 12))); break; + case DINDL: D_word((0x990 | (aNixreg << 12))); break; + case ABASE: case MEMPOST: case MEMPRE: @@ -339,6 +354,7 @@ int eaNgen(WORD siz) case PCMPOST: case PCMPRE: D_word(aNexten); + // Deposit bd (if not suppressed) if ((aNexten & 0x0030) == EXT_BDSIZE0) { @@ -361,7 +377,7 @@ int eaNgen(WORD siz) else { // Arrange for fixup later on - AddFixup(FU_WORD|FU_SEXT, sloc, aNbexpr); + AddFixup(FU_WORD | FU_SEXT | FU_PCRELX, sloc, aNbexpr); D_word(0); } } @@ -383,14 +399,15 @@ int eaNgen(WORD siz) 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) + 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) + else if ((aNexten & 7) == EXT_IISPREW + || (aNexten & 7) == EXT_IISPOSW || (aNexten & 7) == EXT_IISNOIW) { // Deposit word od if (w) @@ -407,7 +424,7 @@ int eaNgen(WORD siz) else { // Arrange for fixup later on - AddFixup(FU_WORD|FU_SEXT, sloc, aNexpr); + AddFixup(FU_WORD | FU_SEXT, sloc, aNexpr); D_word(0); } } @@ -425,13 +442,14 @@ int eaNgen(WORD siz) else { // Arrange for fixup later on - AddFixup(FU_LONG|FU_SEXT, sloc, aNexpr); + 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);