/* Header mode bits */
+#define MF_CPU_65816 0x8000 /* Executable is for 65816 */
+#define MF_CPU_6502 0x0000 /* Executable is for the 6502 */
+#define MF_CPU_MASK 0x8000 /* Mask to extract CPU type */
+
#define MF_SIZE_32BIT 0x2000 /* All size words are 32bit */
-#define MF_CPU_816 0x8000 /* Executable is for 65816 */
+#define MF_SIZE_16BIT 0x0000 /* All size words are 16bit */
+#define MF_SIZE_MASK 0x2000 /* Mask to extract size */
+
+#define MF_ALIGN_1 0x0000 /* Bytewise alignment */
+#define MF_ALIGN_2 0x0001 /* Align words */
+#define MF_ALIGN_4 0x0002 /* Align longwords */
+#define MF_ALIGN_256 0x0003 /* Align pages (256 bytes) */
+#define MF_ALIGN_MASK 0x0003 /* Mask to extract alignment */
/* The four o65 segment types. Note: These values are identical to the values
* needed for the segmentID in the o65 spec.
#define O65RELOC_LOW 0x20
#define O65RELOC_SEGADR 0xc0
#define O65RELOC_SEG 0xa0
+#define O65RELOC_MASK 0xc0
/* O65 executable file header */
typedef struct O65Header O65Header;
O65Option* Options; /* List of file options */
ExtSymTab* Exports; /* Table with exported symbols */
ExtSymTab* Imports; /* Table with imported symbols */
- unsigned Undef; /* Count of undefined symbols */
+ unsigned Undef; /* Count of undefined symbols */
FILE* F; /* The file we're writing to */
char* Filename; /* Name of the output file */
O65RelocTab* TextReloc; /* Relocation table for text segment */
/*****************************************************************************/
-/* Helper functions */
+/* Helper functions */
/*****************************************************************************/
/* Write a "size" word to the file */
{
if (D->Header.Mode & MF_SIZE_32BIT) {
- Write32 (D->F, Val);
+ Write32 (D->F, Val);
} else {
- Write16 (D->F, (unsigned) Val);
+ Write16 (D->F, (unsigned) Val);
}
}
* to check SF_ZP first.
*/
if (S->Flags & SF_RO) {
- return O65SEG_TEXT;
+ return O65SEG_TEXT;
} else if (S->Flags & SF_ZP) {
- return O65SEG_ZP;
+ return O65SEG_ZP;
} else if (S->Flags & SF_BSS) {
- return O65SEG_BSS;
+ return O65SEG_BSS;
} else {
- return O65SEG_DATA;
+ return O65SEG_DATA;
+ }
+}
+
+
+
+static const SegDesc* FindSeg (SegDesc** const List, unsigned Count, const Segment* S)
+/* Search for a segment in the given list of segment descriptors and return
+ * the descriptor for a segment if we found it, and NULL if not.
+ */
+{
+ unsigned I;
+
+ for (I = 0; I < Count; ++I) {
+ if (List[I]->Seg == S) {
+ /* Found */
+ return List[I];
+ }
+ }
+
+ /* Not found */
+ return 0;
+}
+
+
+
+static const SegDesc* O65FindSeg (const O65Desc* D, const Segment* S)
+/* Search for a segment in the segment lists and return it's segment descriptor */
+{
+ const SegDesc* SD;
+
+ if ((SD = FindSeg (D->TextSeg, D->TextCount, S)) != 0) {
+ return SD;
+ }
+ if ((SD = FindSeg (D->DataSeg, D->DataCount, S)) != 0) {
+ return SD;
}
+ if ((SD = FindSeg (D->BssSeg, D->BssCount, S)) != 0) {
+ return SD;
+ }
+ if ((SD = FindSeg (D->ZPSeg, D->ZPCount, S)) != 0) {
+ return SD;
+ }
+
+ /* Not found */
+ return 0;
}
/*****************************************************************************/
-/* Expression handling */
+/* Expression handling */
/*****************************************************************************/
/* We cannot handle more than one segment reference in o65 */
D->TooComplex = 1;
} else {
- /* Remember the segment reference */
+ /* Remember the segment reference */
D->SegRef = GetExprSection (Expr);
}
break;
Offs += D->SegSize; /* Calulate full offset */
Diff = ((long) Offs) - D->LastOffs;
while (Diff > 0xFE) {
- O65RelocPutByte (D->CurReloc, 0xFF);
- Diff -= 0xFE;
+ O65RelocPutByte (D->CurReloc, 0xFF);
+ Diff -= 0xFE;
}
O65RelocPutByte (D->CurReloc, (unsigned char) Diff);
/* Determine the expression to relocate */
Expr = E;
if (E->Op == EXPR_BYTE0 || E->Op == EXPR_BYTE1 ||
- E->Op == EXPR_BYTE2 || E->Op == EXPR_BYTE3 ||
- E->Op == EXPR_WORD0 || E->Op == EXPR_WORD1) {
- /* Use the real expression */
+ E->Op == EXPR_BYTE2 || E->Op == EXPR_BYTE3 ||
+ E->Op == EXPR_WORD0 || E->Op == EXPR_WORD1) {
+ /* Use the real expression */
Expr = E->Left;
}
/* We cannot handle both, an imported symbol and a segment ref */
if (ED.SegRef != 0 && ED.ExtRef != 0) {
- ED.TooComplex = 1;
+ ED.TooComplex = 1;
}
/* Bail out if we cannot handle the expression */
if (ED.TooComplex) {
- return SEG_EXPR_TOO_COMPLEX;
+ return SEG_EXPR_TOO_COMPLEX;
}
/* Safety: Check that we are really referencing a symbol or a segment */
/* Write out the offset that goes into the segment. */
BinVal = ED.Val;
switch (E->Op) {
- case EXPR_BYTE0: BinVal &= 0xFF; break;
- case EXPR_BYTE1: BinVal = (BinVal >> 8) & 0xFF; break;
- case EXPR_BYTE2: BinVal = (BinVal >> 16) & 0xFF; break;
- case EXPR_BYTE3: BinVal = (BinVal >> 24) & 0xFF; break;
- case EXPR_WORD0: BinVal &= 0xFFFF; break;
- case EXPR_WORD1: BinVal = (BinVal >> 16) & 0xFFFF; break;
+ case EXPR_BYTE0: BinVal &= 0xFF; break;
+ case EXPR_BYTE1: BinVal = (BinVal >> 8) & 0xFF; break;
+ case EXPR_BYTE2: BinVal = (BinVal >> 16) & 0xFF; break;
+ case EXPR_BYTE3: BinVal = (BinVal >> 24) & 0xFF; break;
+ case EXPR_WORD0: BinVal &= 0xFFFF; break;
+ case EXPR_WORD1: BinVal = (BinVal >> 16) & 0xFFFF; break;
}
WriteVal (D->F, BinVal, Size);
* information gathered about the expression.
*/
if (E->Op == EXPR_BYTE0) {
- RelocType = O65RELOC_LOW;
+ RelocType = O65RELOC_LOW;
} else if (E->Op == EXPR_BYTE1) {
- RelocType = O65RELOC_HIGH;
+ RelocType = O65RELOC_HIGH;
+ } else if (E->Op == EXPR_BYTE2) {
+ RelocType = O65RELOC_SEG;
} else {
- switch (Size) {
+ switch (Size) {
- case 1:
- RelocType = O65RELOC_LOW;
- break;
+ case 1:
+ RelocType = O65RELOC_LOW;
+ break;
- case 2:
- RelocType = O65RELOC_WORD;
- break;
+ case 2:
+ RelocType = O65RELOC_WORD;
+ break;
- case 3:
- RelocType = O65RELOC_SEGADR;
- break;
+ case 3:
+ RelocType = O65RELOC_SEGADR;
+ break;
- case 4:
- /* 4 byte expression not supported by o65 */
- return SEG_EXPR_TOO_COMPLEX;
+ case 4:
+ /* 4 byte expression not supported by o65 */
+ return SEG_EXPR_TOO_COMPLEX;
- default:
- Internal ("O65WriteExpr: Invalid expression size: %u", Size);
- RelocType = 0; /* Avoid gcc warnings */
- }
+ default:
+ Internal ("O65WriteExpr: Invalid expression size: %u", Size);
+ RelocType = 0; /* Avoid gcc warnings */
+ }
}
/* Determine which segment we're referencing */
if (ED.ExtRef) {
- /* Imported symbol */
- RelocType |= O65SEG_UNDEF;
+ /* Imported symbol */
+ RelocType |= O65SEG_UNDEF;
O65RelocPutByte (D->CurReloc, RelocType);
/* Put the number of the imported symbol into the table */
O65RelocPutWord (D->CurReloc, ExtSymNum (ED.ExtRef));
} else {
- /* Segment reference */
-
-
-
+ /* Segment reference. Search for the segment and map it to it's
+ * o65 segmentID
+ */
+ const SegDesc* Seg = O65FindSeg (D, ED.SegRef->Seg);
+ if (Seg == 0) {
+ /* For some reason, we didn't find this segment in the list of
+ * segments written to the o65 file.
+ */
+ return SEG_EXPR_INVALID;
+ }
+ RelocType |= O65SegType (Seg);
+ O65RelocPutByte (D->CurReloc, RelocType);
+
+ /* Output additional data if needed */
+ switch (RelocType & O65RELOC_MASK) {
+ case O65RELOC_HIGH:
+ O65RelocPutByte (D->CurReloc, ED.Val & 0xFF);
+ break;
+ case O65RELOC_SEG:
+ O65RelocPutWord (D->CurReloc, ED.Val & 0xFFFF);
+ break;
+ }
}
/* Success */
Print (stdout, 1, " Writing `%s'\n", S->Name);
/* Write this segment */
- if (DoWrite) {
- RelocLineInfo (S->Seg);
+ if (DoWrite) {
+ RelocLineInfo (S->Seg);
SegWrite (D->F, S->Seg, O65WriteExpr, D);
- }
+ }
- /* Mark the segment as dumped */
- S->Seg->Dumped = 1;
+ /* Mark the segment as dumped */
+ S->Seg->Dumped = 1;
- /* Calculate the total size */
- D->SegSize += S->Seg->Size;
+ /* Calculate the total size */
+ D->SegSize += S->Seg->Size;
}
- /* Terminate the relocation table for the this segment */
+ /* Terminate the relocation table for this segment */
if (D->CurReloc) {
O65RelocPutByte (D->CurReloc, 0);
}
/* Check the size of the segment for overflow */
- if ((D->Header.Mode & MF_SIZE_32BIT) == 0 && D->SegSize > 0xFFFF) {
- Error ("Segment overflow in file `%s'", D->Filename);
+ if ((D->Header.Mode & MF_SIZE_MASK) == MF_SIZE_16BIT && D->SegSize > 0xFFFF) {
+ Error ("Segment overflow in file `%s'", D->Filename);
}
}
static void O65WriteExports (O65Desc* D)
/* Write the list of exports */
{
- /* For now... */
+ /* Since ld65 creates exectutables, not object files, we do not have
+ * exports. This may change if we support writing shared libraries...
+ */
WriteSize (D, 0);
}
-void O65Set816 (O65Desc* D)
+void O65Set6502 (O65Desc* D)
+/* Enable 6502 mode */
+{
+ D->Header.Mode = (D->Header.Mode & ~MF_CPU_MASK) | MF_CPU_6502;
+}
+
+
+
+void O65Set65816 (O65Desc* D)
/* Enable 816 mode */
{
- D->Header.Mode |= MF_CPU_816;
+ D->Header.Mode = (D->Header.Mode & ~MF_CPU_MASK) | MF_CPU_65816;
+}
+
+
+
+void O65SetSmallModel (O65Desc* D)
+/* Enable a small memory model executable */
+{
+ D->Header.Mode = (D->Header.Mode & ~MF_SIZE_MASK) | MF_SIZE_16BIT;
}
void O65SetLargeModel (O65Desc* D)
/* Enable a large memory model executable */
{
- D->Header.Mode |= MF_SIZE_32BIT;
+ D->Header.Mode = (D->Header.Mode & ~MF_SIZE_MASK) | MF_SIZE_32BIT;
}
/* Set the executable alignment */
{
/* Remove all alignment bits from the mode word */
- D->Header.Mode &= ~0x0003;
+ D->Header.Mode &= ~MF_ALIGN_MASK;
/* Set the alignment bits */
switch (Align) {
- case 1: break;
- case 2: D->Header.Mode |= 0x01; break;
- case 4: D->Header.Mode |= 0x02; break;
- case 256: D->Header.Mode |= 0x03; break;
+ case 1: D->Header.Mode |= MF_ALIGN_1; break;
+ case 2: D->Header.Mode |= MF_ALIGN_2; break;
+ case 4: D->Header.Mode |= MF_ALIGN_4; break;
+ case 256: D->Header.Mode |= MF_ALIGN_256; break;
default: Error ("Invalid alignment for O65 format: %u", Align);
}
}
D->BssCount = 0;
D->ZPCount = 0;
- /* Walk through the memory list and count the segment types */
+ /* Walk through the segment list and count the segment types */
N = M->SegList;
while (N) {
projects / cc65 / commitdiff