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Changed the way that ld65 handles bad offset/start segment attributes, and reports memory area overflows.

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1. Offset/start attributes within a memory area are ignored after an overflow.
2. If a previous segment ends past an offset/start address, then that address is not used.
3. Short map files were generated for memory overflows; now, they are generated for bad offset/start addresses, too.
This commit is contained in:
Greg King 2015-10-22 19:24:08 -04:00
parent f4335eca87
commit 8e9bf4d419
2 changed files with 37 additions and 39 deletions
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72
src/ld65/config.c
View File

@ -1769,12 +1769,12 @@ static void CreateLoadDefines (SegDesc* S, unsigned long SegAddr)
unsigned CfgProcess (void)
/* Process the config file after reading in object files and libraries. This
** includes postprocessing of the config file data but also assigning segments
** and defining segment/memory area related symbols. The function will return
** the number of memory area overflows (so zero means anything went ok).
/* Process the config file, after reading in object files and libraries. This
** includes postprocessing of the config file data; but also assigning segments,
** and defining segment/memory-area related symbols. The function will return
** the number of memory area overflows (so, zero means everything went OK).
** In case of overflows, a short mapfile can be generated later, to ease the
** task of rearranging segments for the user.
** user's task of re-arranging segments.
*/
{
unsigned Overflows = 0;
@ -1788,12 +1788,11 @@ unsigned CfgProcess (void)
/* Postprocess segments */
ProcessSegments ();
/* Walk through each of the memory sections. Add up the sizes and check
/* Walk through each of the memory sections. Add up the sizes; and, check
** for an overflow of the section. Assign the start addresses of the
** segments while doing this.
** segments while doing that.
*/
for (I = 0; I < CollCount (&MemoryAreas); ++I) {
unsigned J;
unsigned long Addr;
@ -1806,7 +1805,7 @@ unsigned CfgProcess (void)
/* Remember if this is a relocatable memory area */
M->Relocatable = RelocatableBinFmt (M->F->Format);
/* Resolve the start address expression, remember the start address
/* Resolve the start address expression, remember the start address,
** and mark the memory area as placed.
*/
if (!IsConstExpr (M->StartExpr)) {
@ -1843,18 +1842,16 @@ unsigned CfgProcess (void)
/* Walk through the segments in this memory area */
for (J = 0; J < CollCount (&M->SegList); ++J) {
/* Get the segment */
SegDesc* S = CollAtUnchecked (&M->SegList, J);
/* Remember the start address before handling this segment */
unsigned long StartAddr = Addr;
/* Some actions depend on wether this is the load or run memory
/* Some actions depend on whether this is the load or run memory
** area.
*/
if (S->Run == M) {
/* This is the run (and maybe load) memory area. Handle
** alignment and explict start address and offset.
*/
@ -1864,7 +1861,7 @@ unsigned CfgProcess (void)
/* If the first segment placed in the memory area needs
** fill bytes for the alignment, emit a warning, since
** this is somewhat suspicious.
** that is somewhat suspicious.
*/
if (M->FillLevel == 0 && NewAddr > Addr) {
CfgWarning (GetSourcePos (S->LI),
@ -1876,32 +1873,36 @@ unsigned CfgProcess (void)
/* Use the aligned address */
Addr = NewAddr;
} else if (S->Flags & (SF_OFFSET | SF_START)) {
} else if ((S->Flags & (SF_OFFSET | SF_START)) != 0 &&
(M->Flags & MF_OVERFLOW) == 0) {
/* Give the segment a fixed starting address */
unsigned long NewAddr = S->Addr;
if (S->Flags & SF_OFFSET) {
/* An offset was given, no address, make an address */
NewAddr += M->Start;
}
if (Addr > NewAddr) {
if (NewAddr < Addr) {
/* Offset already too large */
++Overflows;
if (S->Flags & SF_OFFSET) {
CfgError (GetSourcePos (M->LI),
"Offset too small in `%s', segment `%s'",
GetString (M->Name),
GetString (S->Name));
CfgWarning (GetSourcePos (S->LI),
"Segment `%s' offset is too small in `%s' by %lu byte%c",
GetString (S->Name), GetString (M->Name),
Addr - NewAddr, (Addr - NewAddr == 1) ? ' ' : 's');
} else {
CfgError (GetSourcePos (M->LI),
"Start address too low in `%s', segment `%s'",
GetString (M->Name),
GetString (S->Name));
CfgWarning (GetSourcePos (S->LI),
"Segment `%s' start address is too low in `%s' by %lu byte%c",
GetString (S->Name), GetString (M->Name),
Addr - NewAddr, (Addr - NewAddr == 1) ? ' ' : 's');
}
} else {
Addr = NewAddr;
}
Addr = NewAddr;
}
/* Set the start address of this segment, set the readonly flag
** in the segment and and remember if the segment is in a
** in the segment, and remember if the segment is in a
** relocatable file or not.
*/
S->Seg->PC = Addr;
@ -1913,25 +1914,23 @@ unsigned CfgProcess (void)
S->Seg->MemArea = M;
} else if (S->Load == M) {
/* This is the load memory area, *and* run and load are
/* This is the load memory area; *and*, run and load are
** different (because of the "else" above). Handle alignment.
*/
if (S->Flags & SF_ALIGN_LOAD) {
/* Align the address */
Addr = AlignAddr (Addr, S->LoadAlignment);
}
}
/* If this is the load memory area and the segment doesn't have a
/* If this is the load memory area, and the segment doesn't have a
** fill value defined, use the one from the memory area.
*/
if (S->Load == M && (S->Flags & SF_FILLVAL) == 0) {
S->Seg->FillVal = M->FillVal;
}
/* Increment the fill level of the memory area and check for an
/* Increment the fill level of the memory area; and, check for an
** overflow.
*/
M->FillLevel = Addr + S->Seg->Size - M->Start;
@ -1939,9 +1938,9 @@ unsigned CfgProcess (void)
++Overflows;
M->Flags |= MF_OVERFLOW;
CfgWarning (GetSourcePos (M->LI),
"Memory area overflow in `%s', segment `%s' (%lu bytes)",
GetString (M->Name), GetString (S->Name),
M->FillLevel - M->Size);
"Segment `%s' overflows memory area `%s' by %lu byte%c",
GetString (S->Name), GetString (M->Name),
M->FillLevel - M->Size, (M->FillLevel - M->Size == 1) ? ' ' : 's');
}
/* If requested, define symbols for the start and size of the
@ -1966,10 +1965,9 @@ unsigned CfgProcess (void)
((S->Flags & SF_BSS) == 0 || (M->Flags & MF_FILL) != 0)) {
M->F->Size += Addr - StartAddr;
}
}
/* If requested, define symbols for start, size and offset of the
/* If requested, define symbols for start, size, and offset of the
** memory area
*/
if (M->Flags & MF_DEFINE) {
@ -1999,8 +1997,8 @@ unsigned CfgProcess (void)
SB_Done (&Buf);
}
/* If we didn't have an overflow and are requested to fill the memory
** area, acount for that in the file size.
/* If we didn't have an overflow, and are requested to fill the memory
** area, account for that in the file size.
*/
if ((M->Flags & MF_OVERFLOW) == 0 && (M->Flags & MF_FILL) != 0) {
M->F->Size += (M->Size - M->FillLevel);

4
src/ld65/main.c
View File

@ -819,8 +819,8 @@ int main (int argc, char* argv [])
if (MapFileName) {
CreateMapFile (SHORT_MAPFILE);
}
Error ("Cannot generate output due to memory area overflow%s",
(MemoryAreaOverflows > 1)? "s" : "");
Error ("Cannot generate most of the files due to memory area overflow%c",
(MemoryAreaOverflows > 1) ? 's' : ' ');
}
/* Create the output file */