Section* NewSection (Segment* Seg, unsigned long Alignment, unsigned char AddrSize)
/* Create a new section for the given segment */
{
/* Allocate memory */
Section* S = xmalloc (sizeof (Section));
/* Initialize the data */
S->Next = 0;
S->Seg = Seg;
S->Obj = 0;
S->FragRoot = 0;
S->FragLast = 0;
S->Size = 0;
S->Alignment= Alignment;
S->AddrSize = AddrSize;
/* Calculate the alignment bytes needed for the section */
S->Fill = AlignCount (Seg->Size, S->Alignment);
/* Adjust the segment size and set the section offset */
Seg->Size += S->Fill;
S->Offs = Seg->Size; /* Current size is offset */
/* Insert the section into the segment */
CollAppend (&Seg->Sections, S);
/* Return the struct */
return S;
}
void SegAlign (unsigned long Alignment, int FillVal)
/* Align the PC segment to Alignment. If FillVal is -1, emit fill fragments
* (the actual fill value will be determined by the linker), otherwise use
* the given value.
*/
{
unsigned char Data [4];
unsigned long CombinedAlignment;
unsigned long Count;
/* The segment must have the combined alignment of all separate alignments
* in the source. Calculate this alignment and check it for sanity.
*/
CombinedAlignment = LeastCommonMultiple (ActiveSeg->Align, Alignment);
if (CombinedAlignment > MAX_ALIGNMENT) {
Error ("Combined alignment for active segment is %lu which exceeds %lu",
CombinedAlignment, MAX_ALIGNMENT);
/* Avoid creating large fills for an object file that is thrown away
* later.
*/
Count = 1;
} else {
ActiveSeg->Align = CombinedAlignment;
/* Output a warning for larger alignments if not suppressed */
if (CombinedAlignment > LARGE_ALIGNMENT && !LargeAlignment) {
Warning (0, "Combined alignment is suspiciously large (%lu)",
CombinedAlignment);
}
/* Calculate the number of fill bytes */
Count = AlignCount (ActiveSeg->PC, Alignment);
}
/* Emit the data or a fill fragment */
if (FillVal != -1) {
/* User defined fill value */
memset (Data, FillVal, sizeof (Data));
while (Count) {
if (Count > sizeof (Data)) {
EmitData (Data, sizeof (Data));
Count -= sizeof (Data);
} else {
EmitData (Data, Count);
Count = 0;
}
}
} else {
/* Linker defined fill value */
EmitFill (Count);
}
}