//
// RMAC - Reboot's Macro Assembler for all Atari computers
// SECT.C - Code Generation, Fixups and Section Management
-// Copyright (C) 199x Landon Dyer, 2011-2019 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
//
sp->sloc = sloc;
sp->orgaddr = orgaddr;
- if (scode != NULL) // Bailout code chunk
+ if (scode != NULL) // Bailout code chunk (if any)
scode->ch_size = ch_size;
}
DEBUG { printf(" amt (adjusted)=%u\n", amt); }
SECT * p = §[cursect];
CHUNK * cp = malloc(sizeof(CHUNK) + amt);
+ int first = 0;
- // First chunk in section
if (scode == NULL)
{
+ // First chunk in section
cp->chprev = NULL;
p->sfcode = cp;
+ first = 1;
}
- // Add chunk to other chunks
else
{
+ // Add second and on to previous chunk
cp->chprev = scode;
scode->chnext = cp;
scode->ch_size = ch_size; // Save old chunk's globals
}
// Setup chunk and global vars
- cp->chloc = sloc;
+/*
+So, whenever there's an ORG in a 56K section, it sets sloc TO THE ADDRESS IN THE ORG. Also, the loc/sloc are incremented by 1s, which means to alias correctly to the byte-oriented memory model we have here, we have to fix that kind of crap.
+*/
+ cp->chloc = sloc; // <-- HERE'S THE PROBLEM FOR 56K :-/
cp->chnext = NULL;
challoc = cp->challoc = amt;
ch_size = cp->ch_size = 0;
chptr = cp->chptr = ((uint8_t *)cp) + sizeof(CHUNK);
scode = p->scode = cp;
+ // A quick kludge
+/*
+OK, so this is a bit shite, but at least it gets things working the way they should. The right way to do this is not rely on sloc & friends for the right fixup address but to have an accurate model of the thing. That will probably come with v2.0.1 :-P
+
+So the problem is, d_org sets sloc to the address of the ORG statement, and that gives an incorrect base for the fixup. And so when a second (or later) chunk is allocated, it gets set wrong. Further complicating things is that the orgaddress *does not* get used in a typical way with the DSP56001 code, and, as such, causes incorrect addresses to be generated. All that has to be dealt with in order to get this right and do away with this kludge.
+*/
+ if (((cursect == M56001P) || (cursect == M56001X) || (cursect == M56001Y)) && !first)
+ cp->chloc = cp->chprev->chloc + cp->chprev->ch_size;
+
return;
}
{
attr |= FU_56001;
// Save the exact spot in this chunk where the fixup should go
- _orgaddr = chptr - scode->chptr;
+ _orgaddr = chptr - scode->chptr + scode->chloc;
}
// Allocate space for the fixup + any expression
// Complex expression
if (dw & FU_EXPR)
{
+ // evexpr presumably issues the errors/warnings here
if (evexpr(fup->expr, &eval, &eattr, &esym) != OK)
continue;
+
+ if (CHECK_OPTS(OPT_PC_RELATIVE))
+ if (eattr & REFERENCED)
+ if (eattr & DEFINED)
+ if (!(eattr & EQUATED))
+ {
+ error("relocation not allowed");
+ continue;
+ }
}
// Simple symbol
else
SYM * sy = fup->symbol;
eattr = sy->sattr;
+ if (CHECK_OPTS(OPT_PC_RELATIVE))
+ if (eattr & REFERENCED)
+ if (eattr & DEFINED)
+ if (!(eattr & EQUATED))
+ {
+ error("relocation not allowed");
+ continue;
+ }
+
if (eattr & DEFINED)
eval = sy->svalue;
else
// If the symbol is not defined, but global, set esym to sy
if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
esym = sy;
+
+ DEBUG { printf(" name: %s, value: $%" PRIX64 "\n", sy->sname, sy->svalue); }
}
uint16_t tdb = eattr & TDB;
// from the location (that will happen in the linker when the external
// reference is resolved).
//
- // MWC expects PC-relative things to have the LOC subtracted from the
- // value, if the value is external (that is, undefined at this point).
- //
// PC-relative fixups must be DEFINED and either in the same section
// (whereupon the subtraction takes place) or ABS (with no subtract).
- if (dw & FU_PCREL)
+ if ((dw & FU_PCREL) || (dw & FU_PCRELX))
{
if (eattr & DEFINED)
{
if (tdb == sno)
+ {
eval -= loc;
+
+ // In this instruction the PC is located a DWORD away
+ if (dw & FU_PCRELX)
+ eval += 2;
+ }
else if (tdb)
{
// Allow cross-section PCREL fixups in Alcyon mode
- if (prg_flag)
+ if (prg_flag || (obj_format == RAW))
{
switch (tdb)
{
}
eval -= loc;
+
+ // In this instruction the PC is located a DWORD away
+ if (dw & FU_PCRELX)
+ eval += 2;
}
else
{
}
}
- if (sbra_flag && (dw & FU_LBRA) && (eval + 0x80 < 0x100))
+ if (optim_warn_flag && (dw & FU_LBRA) && (eval + 0x80 < 0x100))
warn("unoptimized short branch");
}
- else if (obj_format == MWC)
- eval -= loc;
+ // Be sure to clear any TDB flags, since we handled it just now
tdb = 0;
eattr &= ~TDB;
}
if (eval == 0)
{
- if (CHECK_OPTS(OPT_NULL_BRA))
+ if (*locp) // optim_flags[OPT_NULL_BRA] is stored there, check the comment in mach.s under m_br
{
// Just output a NOP
*locp++ = 0x4E;
*locp = 0x71;
+ if (optim_warn_flag)
+ warn("bra.s with zero offset converted to NOP");
continue;
}
else
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