1 /*****************************************************************************/
5 /* Module to handle the o65 binary format */
9 /* (C) 1999-2009, Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
61 /*****************************************************************************/
63 /*****************************************************************************/
67 /* Header mode bits */
68 #define MF_CPU_65816 0x8000 /* Executable is for 65816 */
69 #define MF_CPU_6502 0x0000 /* Executable is for the 6502 */
70 #define MF_CPU_MASK 0x8000 /* Mask to extract CPU type */
72 #define MF_RELOC_PAGE 0x4000 /* Page wise relocation */
73 #define MF_RELOC_BYTE 0x0000 /* Byte wise relocation */
74 #define MF_RELOC_MASK 0x4000 /* Mask to extract relocation type */
76 #define MF_SIZE_32BIT 0x2000 /* All size words are 32bit */
77 #define MF_SIZE_16BIT 0x0000 /* All size words are 16bit */
78 #define MF_SIZE_MASK 0x2000 /* Mask to extract size */
80 #define MF_FTYPE_OBJ 0x1000 /* Object file */
81 #define MF_FTYPE_EXE 0x0000 /* Executable file */
82 #define MF_FTYPE_MASK 0x1000 /* Mask to extract type */
84 #define MF_ADDR_SIMPLE 0x0800 /* Simple addressing */
85 #define MF_ADDR_DEFAULT 0x0000 /* Default addressing */
86 #define MF_ADDR_MASK 0x0800 /* Mask to extract addressing */
88 #define MF_ALIGN_1 0x0000 /* Bytewise alignment */
89 #define MF_ALIGN_2 0x0001 /* Align words */
90 #define MF_ALIGN_4 0x0002 /* Align longwords */
91 #define MF_ALIGN_256 0x0003 /* Align pages (256 bytes) */
92 #define MF_ALIGN_MASK 0x0003 /* Mask to extract alignment */
94 /* The four o65 segment types. Note: These values are identical to the values
95 * needed for the segmentID in the o65 spec.
97 #define O65SEG_UNDEF 0x00
98 #define O65SEG_ABS 0x01
99 #define O65SEG_TEXT 0x02
100 #define O65SEG_DATA 0x03
101 #define O65SEG_BSS 0x04
102 #define O65SEG_ZP 0x05
104 /* Relocation type codes for the o65 format */
105 #define O65RELOC_WORD 0x80
106 #define O65RELOC_HIGH 0x40
107 #define O65RELOC_LOW 0x20
108 #define O65RELOC_SEGADR 0xC0
109 #define O65RELOC_SEG 0xA0
110 #define O65RELOC_MASK 0xE0
112 /* O65 executable file header */
113 typedef struct O65Header O65Header;
115 unsigned Version; /* Version number for o65 format */
116 unsigned Mode; /* Mode word */
117 unsigned long TextBase; /* Base address of text segment */
118 unsigned long TextSize; /* Size of text segment */
119 unsigned long DataBase; /* Base of data segment */
120 unsigned long DataSize; /* Size of data segment */
121 unsigned long BssBase; /* Base of bss segment */
122 unsigned long BssSize; /* Size of bss segment */
123 unsigned long ZPBase; /* Base of zeropage segment */
124 unsigned long ZPSize; /* Size of zeropage segment */
125 unsigned long StackSize; /* Requested stack size */
129 typedef struct O65Option O65Option;
131 O65Option* Next; /* Next in option list */
132 unsigned char Type; /* Type of option */
133 unsigned char Len; /* Data length */
134 unsigned char Data [1]; /* Data, dynamically allocated */
137 /* A o65 relocation table */
138 typedef struct O65RelocTab O65RelocTab;
140 unsigned Size; /* Size of the table */
141 unsigned Fill; /* Amount used */
142 unsigned char* Buf; /* Buffer, dynamically allocated */
145 /* Structure describing the format */
147 O65Header Header; /* File header */
148 O65Option* Options; /* List of file options */
149 ExtSymTab* Exports; /* Table with exported symbols */
150 ExtSymTab* Imports; /* Table with imported symbols */
151 unsigned Undef; /* Count of undefined symbols */
152 FILE* F; /* The file we're writing to */
153 const char* Filename; /* Name of the output file */
154 O65RelocTab* TextReloc; /* Relocation table for text segment */
155 O65RelocTab* DataReloc; /* Relocation table for data segment */
157 unsigned TextCount; /* Number of segments assigned to .text */
158 SegDesc** TextSeg; /* Array of text segments */
159 unsigned DataCount; /* Number of segments assigned to .data */
160 SegDesc** DataSeg; /* Array of data segments */
161 unsigned BssCount; /* Number of segments assigned to .bss */
162 SegDesc** BssSeg; /* Array of bss segments */
163 unsigned ZPCount; /* Number of segments assigned to .zp */
164 SegDesc** ZPSeg; /* Array of zp segments */
166 /* Temporary data for writing segments */
167 unsigned long SegSize;
168 O65RelocTab* CurReloc;
172 /* Structure for parsing expression trees */
173 typedef struct ExprDesc ExprDesc;
175 O65Desc* D; /* File format descriptor */
176 long Val; /* The offset value */
177 int TooComplex; /* Expression too complex */
178 Memory* MemRef; /* Memory reference if any */
179 Segment* SegRef; /* Segment reference if any */
180 Section* SecRef; /* Section reference if any */
181 ExtSym* ExtRef; /* External reference if any */
186 /*****************************************************************************/
187 /* Helper functions */
188 /*****************************************************************************/
192 static ExprDesc* InitExprDesc (ExprDesc* ED, O65Desc* D)
193 /* Initialize an ExprDesc structure for use with O65ParseExpr */
207 static void WriteSize (const O65Desc* D, unsigned long Val)
208 /* Write a "size" word to the file */
210 switch (D->Header.Mode & MF_SIZE_MASK) {
211 case MF_SIZE_16BIT: Write16 (D->F, (unsigned) Val); break;
212 case MF_SIZE_32BIT: Write32 (D->F, Val); break;
213 default: Internal ("Invalid size in header: %04X", D->Header.Mode);
219 static unsigned O65SegType (const SegDesc* S)
220 /* Map our own segment types into something o65 compatible */
222 /* Check the segment type. Readonly segments are assign to the o65
223 * text segment, writeable segments that contain data are assigned
224 * to data, bss and zp segments are handled respectively.
225 * Beware: Zeropage segments have the SF_BSS flag set, so be sure
226 * to check SF_ZP first.
228 if (S->Flags & SF_RO) {
230 } else if (S->Flags & SF_ZP) {
232 } else if (S->Flags & SF_BSS) {
241 static void CvtMemoryToSegment (ExprDesc* ED)
242 /* Convert a memory area into a segment by searching the list of run segments
243 * in this memory area and assigning the nearest one.
246 /* Get the memory area from the expression */
247 Memory* M = ED->MemRef;
249 /* Get the list of segments in this memory area */
250 MemListNode* N = M->SegList;
252 /* Remember the "nearest" segment and its offset */
253 Segment* Nearest = 0;
254 unsigned long Offs = ULONG_MAX;
256 /* Walk over all segments */
259 /* Get the segment from this node and check if it's a run segment */
265 /* Get the segment from the segment descriptor */
266 Segment* Seg = S->Seg;
269 if ((long) Seg->PC <= ED->Val && (O = (ED->Val - Seg->PC)) < Offs) {
270 /* This is the nearest segment for now */
274 /* If we found an exact match, don't look further */
285 /* If we found a segment, use it and adjust the offset */
287 ED->SegRef = Nearest;
289 ED->Val -= Nearest->PC;
295 static const SegDesc* FindSeg (SegDesc** const List, unsigned Count, const Segment* S)
296 /* Search for a segment in the given list of segment descriptors and return
297 * the descriptor for a segment if we found it, and NULL if not.
302 for (I = 0; I < Count; ++I) {
303 if (List[I]->Seg == S) {
315 static const SegDesc* O65FindSeg (const O65Desc* D, const Segment* S)
316 /* Search for a segment in the segment lists and return it's segment descriptor */
320 if ((SD = FindSeg (D->TextSeg, D->TextCount, S)) != 0) {
323 if ((SD = FindSeg (D->DataSeg, D->DataCount, S)) != 0) {
326 if ((SD = FindSeg (D->BssSeg, D->BssCount, S)) != 0) {
329 if ((SD = FindSeg (D->ZPSeg, D->ZPCount, S)) != 0) {
339 /*****************************************************************************/
340 /* Expression handling */
341 /*****************************************************************************/
345 static void O65ParseExpr (ExprNode* Expr, ExprDesc* D, int Sign)
346 /* Extract and evaluate all constant factors in an subtree that has only
347 * additions and subtractions. If anything other than additions and
348 * subtractions are found, D->TooComplex is set to true.
356 D->Val += (Sign * Expr->V.IVal);
360 /* Get the referenced Export */
361 E = GetExprExport (Expr);
362 /* If this export has a mark set, we've already encountered it.
363 * This means that the export is used to define it's own value,
364 * which in turn means, that we have a circular reference.
366 if (ExportHasMark (E)) {
367 CircularRefError (E);
368 } else if (E->Expr == 0) {
369 /* Dummy export, must be an o65 imported symbol */
370 ExtSym* S = O65GetImport (D->D, E->Name);
373 /* We cannot have more than one external reference in o65 */
376 /* Remember the external reference */
381 O65ParseExpr (E->Expr, D, Sign);
388 /* We cannot handle more than one segment reference in o65 */
391 /* Remember the segment reference */
392 D->SecRef = GetExprSection (Expr);
393 /* Add the offset of the section to the constant value */
394 D->Val += Sign * (D->SecRef->Offs + D->SecRef->Seg->PC);
400 /* We cannot handle more than one segment reference in o65 */
403 /* Remember the segment reference */
404 D->SegRef = Expr->V.Seg;
405 /* Add the offset of the segment to the constant value */
406 D->Val += (Sign * D->SegRef->PC);
412 /* We cannot handle more than one memory reference in o65 */
415 /* Remember the memory area reference */
416 D->MemRef = Expr->V.Mem;
417 /* Add the start address of the memory area to the constant
420 D->Val += (Sign * D->MemRef->Start);
425 O65ParseExpr (Expr->Left, D, Sign);
426 O65ParseExpr (Expr->Right, D, Sign);
430 O65ParseExpr (Expr->Left, D, Sign);
431 O65ParseExpr (Expr->Right, D, -Sign);
435 /* Expression contains illegal operators */
444 /*****************************************************************************/
445 /* Relocation tables */
446 /*****************************************************************************/
450 static O65RelocTab* NewO65RelocTab (void)
451 /* Create a new relocation table */
453 /* Allocate a new structure */
454 O65RelocTab* R = xmalloc (sizeof (O65RelocTab));
456 /* Initialize the data */
461 /* Return the created struct */
467 static void FreeO65RelocTab (O65RelocTab* R)
468 /* Free a relocation table */
476 static void O65RelocPutByte (O65RelocTab* R, unsigned B)
477 /* Put the byte into the relocation table */
479 /* Do we have enough space in the buffer? */
480 if (R->Fill == R->Size) {
481 /* We need to grow the buffer */
485 R->Size = 1024; /* Initial size */
487 R->Buf = xrealloc (R->Buf, R->Size);
490 /* Put the byte into the buffer */
491 R->Buf [R->Fill++] = (unsigned char) B;
496 static void O65RelocPutWord (O65RelocTab* R, unsigned W)
497 /* Put a word into the relocation table */
499 O65RelocPutByte (R, W);
500 O65RelocPutByte (R, W >> 8);
505 static void O65WriteReloc (O65RelocTab* R, FILE* F)
506 /* Write the relocation table to the given file */
508 WriteData (F, R->Buf, R->Fill);
513 /*****************************************************************************/
514 /* Option handling */
515 /*****************************************************************************/
519 static O65Option* NewO65Option (unsigned Type, const void* Data, unsigned DataLen)
520 /* Allocate and initialize a new option struct */
524 /* Check the length */
525 CHECK (DataLen <= 253);
527 /* Allocate memory */
528 O = xmalloc (sizeof (O65Option) - 1 + DataLen);
530 /* Initialize the structure */
534 memcpy (O->Data, Data, DataLen);
536 /* Return the created struct */
542 static void FreeO65Option (O65Option* O)
543 /* Free an O65Option struct */
550 /*****************************************************************************/
551 /* Subroutines to write o65 sections */
552 /*****************************************************************************/
556 static void O65WriteHeader (O65Desc* D)
557 /* Write the header of the executable to the given file */
559 static unsigned char Trailer [5] = {
560 0x01, 0x00, 0x6F, 0x36, 0x35
565 /* Write the fixed header */
566 WriteData (D->F, Trailer, sizeof (Trailer));
567 Write8 (D->F, D->Header.Version);
568 Write16 (D->F, D->Header.Mode);
569 WriteSize (D, D->Header.TextBase);
570 WriteSize (D, D->Header.TextSize);
571 WriteSize (D, D->Header.DataBase);
572 WriteSize (D, D->Header.DataSize);
573 WriteSize (D, D->Header.BssBase);
574 WriteSize (D, D->Header.BssSize);
575 WriteSize (D, D->Header.ZPBase);
576 WriteSize (D, D->Header.ZPSize);
577 WriteSize (D, D->Header.StackSize);
579 /* Write the options */
582 Write8 (D->F, O->Len + 2); /* Account for len and type bytes */
583 Write8 (D->F, O->Type);
585 WriteData (D->F, O->Data, O->Len);
590 /* Write the end-of-options byte */
596 static unsigned O65WriteExpr (ExprNode* E, int Signed, unsigned Size,
597 unsigned long Offs, void* Data)
598 /* Called from SegWrite for an expression. Evaluate the expression, check the
599 * range and write the expression value to the file, update the relocation
608 unsigned char RelocType;
610 /* Cast the Data pointer to its real type, an O65Desc */
611 O65Desc* D = (O65Desc*) Data;
613 /* Check for a constant expression */
614 if (IsConstExpr (E)) {
615 /* Write out the constant expression */
616 return SegWriteConstExpr (((O65Desc*)Data)->F, E, Signed, Size);
619 /* We have a relocatable expression that needs a relocation table entry.
620 * Calculate the number of bytes between this entry and the last one, and
621 * setup all necessary intermediate bytes in the relocation table.
623 Offs += D->SegSize; /* Calulate full offset */
624 Diff = ((long) Offs) - D->LastOffs;
625 while (Diff > 0xFE) {
626 O65RelocPutByte (D->CurReloc, 0xFF);
629 O65RelocPutByte (D->CurReloc, (unsigned char) Diff);
631 /* Remember this offset for the next time */
634 /* Determine the expression to relocate */
636 if (E->Op == EXPR_BYTE0 || E->Op == EXPR_BYTE1 ||
637 E->Op == EXPR_BYTE2 || E->Op == EXPR_BYTE3 ||
638 E->Op == EXPR_WORD0 || E->Op == EXPR_WORD1) {
639 /* Use the real expression */
643 /* Recursively collect information about this expression */
644 O65ParseExpr (Expr, InitExprDesc (&ED, D), 1);
646 /* We cannot handle more than one external reference */
647 RefCount = (ED.MemRef != 0) + (ED.SegRef != 0) +
648 (ED.SecRef != 0) + (ED.ExtRef != 0);
653 /* If we have a memory area reference, we need to convert it into a
654 * segment reference. If we cannot do that, we cannot handle the
658 CvtMemoryToSegment (&ED);
659 if (ED.SegRef == 0) {
660 return SEG_EXPR_TOO_COMPLEX;
664 /* Bail out if we cannot handle the expression */
666 return SEG_EXPR_TOO_COMPLEX;
669 /* Safety: Check that we have exactly one reference */
670 CHECK (RefCount == 1);
672 /* Write out the offset that goes into the segment. */
675 case EXPR_BYTE0: BinVal &= 0xFF; break;
676 case EXPR_BYTE1: BinVal = (BinVal >> 8) & 0xFF; break;
677 case EXPR_BYTE2: BinVal = (BinVal >> 16) & 0xFF; break;
678 case EXPR_BYTE3: BinVal = (BinVal >> 24) & 0xFF; break;
679 case EXPR_WORD0: BinVal &= 0xFFFF; break;
680 case EXPR_WORD1: BinVal = (BinVal >> 16) & 0xFFFF; break;
682 WriteVal (D->F, BinVal, Size);
684 /* Determine the actual type of relocation entry needed from the
685 * information gathered about the expression.
687 if (E->Op == EXPR_BYTE0) {
688 RelocType = O65RELOC_LOW;
689 } else if (E->Op == EXPR_BYTE1) {
690 RelocType = O65RELOC_HIGH;
691 } else if (E->Op == EXPR_BYTE2) {
692 RelocType = O65RELOC_SEG;
697 RelocType = O65RELOC_LOW;
701 RelocType = O65RELOC_WORD;
705 RelocType = O65RELOC_SEGADR;
709 /* 4 byte expression not supported by o65 */
710 return SEG_EXPR_TOO_COMPLEX;
713 Internal ("O65WriteExpr: Invalid expression size: %u", Size);
714 RelocType = 0; /* Avoid gcc warnings */
718 /* Determine which segment we're referencing */
719 if (ED.SegRef || ED.SecRef) {
723 /* Segment or section reference. */
725 /* Get segment from section */
726 ED.SegRef = ED.SecRef->Seg;
729 /* Search for the segment and map it to it's o65 segmentID */
730 Seg = O65FindSeg (D, ED.SegRef);
732 /* For some reason, we didn't find this segment in the list of
733 * segments written to the o65 file.
735 return SEG_EXPR_INVALID;
737 RelocType |= O65SegType (Seg);
738 O65RelocPutByte (D->CurReloc, RelocType);
740 /* Output additional data if needed */
741 switch (RelocType & O65RELOC_MASK) {
743 O65RelocPutByte (D->CurReloc, ED.Val & 0xFF);
746 O65RelocPutWord (D->CurReloc, ED.Val & 0xFFFF);
750 } else if (ED.ExtRef) {
751 /* Imported symbol */
752 RelocType |= O65SEG_UNDEF;
753 O65RelocPutByte (D->CurReloc, RelocType);
754 /* Put the number of the imported symbol into the table */
755 O65RelocPutWord (D->CurReloc, ExtSymNum (ED.ExtRef));
759 /* OOPS - something bad happened */
760 Internal ("External reference not handled");
770 static void O65WriteSeg (O65Desc* D, SegDesc** Seg, unsigned Count, int DoWrite)
771 /* Write one segment to the o65 output file */
776 /* Initialize variables */
780 /* Write out all segments */
781 for (I = 0; I < Count; ++I) {
783 /* Get the segment from the list node */
786 /* Relocate line info for this segment */
787 RelocLineInfo (S->Seg);
789 /* Keep the user happy */
790 Print (stdout, 1, " Writing `%s'\n", GetString (S->Name));
792 /* Write this segment */
794 SegWrite (D->F, S->Seg, O65WriteExpr, D);
797 /* Mark the segment as dumped */
800 /* Calculate the total size */
801 D->SegSize += S->Seg->Size;
804 /* Terminate the relocation table for this segment */
806 O65RelocPutByte (D->CurReloc, 0);
809 /* Check the size of the segment for overflow */
810 if ((D->Header.Mode & MF_SIZE_MASK) == MF_SIZE_16BIT && D->SegSize > 0xFFFF) {
811 Error ("Segment overflow in file `%s'", D->Filename);
818 static void O65WriteTextSeg (O65Desc* D)
819 /* Write the code segment to the o65 output file */
821 /* Initialize variables */
822 D->CurReloc = D->TextReloc;
824 /* Dump all text segments */
825 O65WriteSeg (D, D->TextSeg, D->TextCount, 1);
827 /* Set the size of the segment */
828 D->Header.TextSize = D->SegSize;
833 static void O65WriteDataSeg (O65Desc* D)
834 /* Write the data segment to the o65 output file */
836 /* Initialize variables */
837 D->CurReloc = D->DataReloc;
839 /* Dump all data segments */
840 O65WriteSeg (D, D->DataSeg, D->DataCount, 1);
842 /* Set the size of the segment */
843 D->Header.DataSize = D->SegSize;
848 static void O65WriteBssSeg (O65Desc* D)
849 /* "Write" the bss segments to the o65 output file. This will only update
850 * the relevant header fields.
853 /* Initialize variables */
856 /* Dump all data segments */
857 O65WriteSeg (D, D->BssSeg, D->BssCount, 0);
859 /* Set the size of the segment */
860 D->Header.BssSize = D->SegSize;
865 static void O65WriteZPSeg (O65Desc* D)
866 /* "Write" the zeropage segments to the o65 output file. This will only update
867 * the relevant header fields.
870 /* Initialize variables */
873 /* Dump all data segments */
874 O65WriteSeg (D, D->ZPSeg, D->ZPCount, 0);
876 /* Set the size of the segment */
877 D->Header.ZPSize = D->SegSize;
882 static void O65WriteImports (O65Desc* D)
883 /* Write the list of imported symbols to the O65 file */
887 /* Write the number of imports */
888 WriteSize (D, ExtSymCount (D->Imports));
890 /* Write out the symbol names, zero terminated */
891 S = ExtSymList (D->Imports);
894 const char* Name = GetString (ExtSymName (S));
895 /* And write it to the output file */
896 WriteData (D->F, Name, strlen (Name) + 1);
904 static void O65WriteTextReloc (O65Desc* D)
905 /* Write the relocation for the text segment to the output file */
907 O65WriteReloc (D->TextReloc, D->F);
912 static void O65WriteDataReloc (O65Desc* D)
913 /* Write the relocation for the data segment to the output file */
915 O65WriteReloc (D->DataReloc, D->F);
920 static void O65WriteExports (O65Desc* D)
921 /* Write the list of exports */
925 /* Write the number of exports */
926 WriteSize (D, ExtSymCount (D->Exports));
928 /* Write out the symbol information */
929 S = ExtSymList (D->Exports);
933 unsigned char SegmentID;
937 unsigned NameIdx = ExtSymName (S);
938 const char* Name = GetString (NameIdx);
940 /* Get the export for this symbol. We've checked before that this
941 * export does really exist, so if it is unresolved, or if we don't
942 * find it, there is an error in the linker code.
944 Export* E = FindExport (NameIdx);
945 if (E == 0 || IsUnresolvedExport (E)) {
946 Internal ("Unresolved export `%s' found in O65WriteExports", Name);
949 /* Get the expression for the symbol */
952 /* Recursively collect information about this expression */
953 O65ParseExpr (Expr, InitExprDesc (&ED, D), 1);
955 /* We cannot handle expressions with imported symbols, or expressions
956 * with more than one segment reference here
958 if (ED.ExtRef != 0 || (ED.SegRef != 0 && ED.SecRef != 0)) {
962 /* Bail out if we cannot handle the expression */
964 Error ("Expression for symbol `%s' is too complex", Name);
967 /* Determine the segment id for the expression */
968 if (ED.SegRef != 0 || ED.SecRef != 0) {
972 /* Segment or section reference */
973 if (ED.SecRef != 0) {
974 ED.SegRef = ED.SecRef->Seg; /* Get segment from section */
977 /* Search for the segment and map it to it's o65 segmentID */
978 Seg = O65FindSeg (D, ED.SegRef);
980 /* For some reason, we didn't find this segment in the list of
981 * segments written to the o65 file.
983 Error ("Segment for symbol `%s' is undefined", Name);
985 SegmentID = O65SegType (Seg);
990 SegmentID = O65SEG_ABS;
994 /* Write the name to the output file */
995 WriteData (D->F, Name, strlen (Name) + 1);
997 /* Output the segment id followed by the literal value */
998 Write8 (D->F, SegmentID);
999 WriteSize (D, ED.Val);
1008 /*****************************************************************************/
1010 /*****************************************************************************/
1014 O65Desc* NewO65Desc (void)
1015 /* Create, initialize and return a new O65 descriptor struct */
1017 /* Allocate a new structure */
1018 O65Desc* D = xmalloc (sizeof (O65Desc));
1020 /* Initialize the header */
1021 D->Header.Version = 0;
1023 D->Header.TextBase = 0;
1024 D->Header.TextSize = 0;
1025 D->Header.DataBase = 0;
1026 D->Header.DataSize = 0;
1027 D->Header.BssBase = 0;
1028 D->Header.BssSize = 0;
1029 D->Header.ZPBase = 0;
1030 D->Header.ZPSize = 0;
1031 D->Header.StackSize = 0; /* Let OS choose a good value */
1033 /* Initialize other data */
1035 D->Exports = NewExtSymTab ();
1036 D->Imports = NewExtSymTab ();
1040 D->TextReloc = NewO65RelocTab ();
1041 D->DataReloc = NewO65RelocTab ();
1051 /* Return the created struct */
1057 void FreeO65Desc (O65Desc* D)
1058 /* Delete the descriptor struct with cleanup */
1060 /* Free the segment arrays */
1066 /* Free the relocation tables */
1067 FreeO65RelocTab (D->DataReloc);
1068 FreeO65RelocTab (D->TextReloc);
1070 /* Free the option list */
1071 while (D->Options) {
1072 O65Option* O = D->Options;
1073 D->Options = D->Options->Next;
1077 /* Free the external symbol tables */
1078 FreeExtSymTab (D->Exports);
1079 FreeExtSymTab (D->Imports);
1081 /* Free the struct itself */
1087 void O65Set6502 (O65Desc* D)
1088 /* Enable 6502 mode */
1090 D->Header.Mode = (D->Header.Mode & ~MF_CPU_MASK) | MF_CPU_6502;
1095 void O65Set65816 (O65Desc* D)
1096 /* Enable 816 mode */
1098 D->Header.Mode = (D->Header.Mode & ~MF_CPU_MASK) | MF_CPU_65816;
1103 void O65SetSmallModel (O65Desc* D)
1104 /* Enable a small memory model executable */
1106 D->Header.Mode = (D->Header.Mode & ~MF_SIZE_MASK) | MF_SIZE_16BIT;
1111 void O65SetLargeModel (O65Desc* D)
1112 /* Enable a large memory model executable */
1114 D->Header.Mode = (D->Header.Mode & ~MF_SIZE_MASK) | MF_SIZE_32BIT;
1119 void O65SetAlignment (O65Desc* D, unsigned Align)
1120 /* Set the executable alignment */
1122 /* Remove all alignment bits from the mode word */
1123 D->Header.Mode &= ~MF_ALIGN_MASK;
1125 /* Set the alignment bits */
1127 case 1: D->Header.Mode |= MF_ALIGN_1; break;
1128 case 2: D->Header.Mode |= MF_ALIGN_2; break;
1129 case 4: D->Header.Mode |= MF_ALIGN_4; break;
1130 case 256: D->Header.Mode |= MF_ALIGN_256; break;
1131 default: Error ("Invalid alignment for O65 format: %u", Align);
1137 void O65SetOption (O65Desc* D, unsigned Type, const void* Data, unsigned DataLen)
1138 /* Set an o65 header option */
1140 /* Create a new option structure */
1141 O65Option* O = NewO65Option (Type, Data, DataLen);
1143 /* Insert it into the linked list */
1144 O->Next = D->Options;
1150 void O65SetOS (O65Desc* D, unsigned OS, unsigned Version, unsigned Id)
1151 /* Set an option describing the target operating system */
1153 /* Setup the option data */
1154 unsigned char Opt[4];
1158 /* Write the correct option length */
1162 /* Set the 16 bit id */
1163 Opt[2] = (unsigned char) Id;
1164 Opt[3] = (unsigned char) (Id >> 8);
1165 O65SetOption (D, O65OPT_OS, Opt, 4);
1169 /* No id for OS/A65, Lunix, and unknown OSes */
1170 O65SetOption (D, O65OPT_OS, Opt, 2);
1178 ExtSym* O65GetImport (O65Desc* D, unsigned Ident)
1179 /* Return the imported symbol or NULL if not found */
1181 /* Retrieve the symbol from the table */
1182 return GetExtSym (D->Imports, Ident);
1187 void O65SetImport (O65Desc* D, unsigned Ident)
1188 /* Set an imported identifier */
1190 /* Insert the entry into the table */
1191 NewExtSym (D->Imports, Ident);
1196 ExtSym* O65GetExport (O65Desc* D, unsigned Ident)
1197 /* Return the exported symbol or NULL if not found */
1199 /* Retrieve the symbol from the table */
1200 return GetExtSym (D->Exports, Ident);
1205 void O65SetExport (O65Desc* D, unsigned Ident)
1206 /* Set an exported identifier */
1208 /* Get the export for this symbol and check if it does exist and is
1209 * a resolved symbol.
1211 Export* E = FindExport (Ident);
1212 if (E == 0 || IsUnresolvedExport (E)) {
1213 Error ("Unresolved export: `%s'", GetString (Ident));
1216 /* Insert the entry into the table */
1217 NewExtSym (D->Exports, Ident);
1222 static void O65SetupSegments (O65Desc* D, File* F)
1223 /* Setup segment assignments */
1228 unsigned TextIdx, DataIdx, BssIdx, ZPIdx;
1230 /* Initialize the counters */
1236 /* Walk over the memory list */
1239 /* Walk through the segment list and count the segment types */
1243 /* Get the segment from the list node */
1246 /* Check the segment type. */
1247 switch (O65SegType (S)) {
1248 case O65SEG_TEXT: D->TextCount++; break;
1249 case O65SEG_DATA: D->DataCount++; break;
1250 case O65SEG_BSS: D->BssCount++; break;
1251 case O65SEG_ZP: D->ZPCount++; break;
1252 default: Internal ("Invalid return from O65SegType");
1255 /* Next segment node */
1258 /* Next memory area */
1262 /* Allocate memory according to the numbers */
1263 D->TextSeg = xmalloc (D->TextCount * sizeof (SegDesc*));
1264 D->DataSeg = xmalloc (D->DataCount * sizeof (SegDesc*));
1265 D->BssSeg = xmalloc (D->BssCount * sizeof (SegDesc*));
1266 D->ZPSeg = xmalloc (D->ZPCount * sizeof (SegDesc*));
1268 /* Walk again through the list and setup the segment arrays */
1269 TextIdx = DataIdx = BssIdx = ZPIdx = 0;
1276 /* Get the segment from the list node */
1279 /* Check the segment type. */
1280 switch (O65SegType (S)) {
1281 case O65SEG_TEXT: D->TextSeg [TextIdx++] = S; break;
1282 case O65SEG_DATA: D->DataSeg [DataIdx++] = S; break;
1283 case O65SEG_BSS: D->BssSeg [BssIdx++] = S; break;
1284 case O65SEG_ZP: D->ZPSeg [ZPIdx++] = S; break;
1285 default: Internal ("Invalid return from O65SegType");
1288 /* Next segment node */
1291 /* Next memory area */
1298 static int O65Unresolved (unsigned Name, void* D)
1299 /* Called if an unresolved symbol is encountered */
1301 /* Check if the symbol is an imported o65 symbol */
1302 if (O65GetImport (D, Name) != 0) {
1303 /* This is an external symbol, relax... */
1306 /* This is actually an unresolved external. Bump the counter */
1307 ((O65Desc*) D)->Undef++;
1314 static void O65SetupHeader (O65Desc* D)
1315 /* Set additional stuff in the header */
1317 /* Set the base addresses of the segments */
1318 if (D->TextCount > 0) {
1319 SegDesc* FirstSeg = D->TextSeg [0];
1320 D->Header.TextBase = FirstSeg->Seg->PC;
1322 if (D->DataCount > 0) {
1323 SegDesc* FirstSeg = D->DataSeg [0];
1324 D->Header.DataBase = FirstSeg->Seg->PC;
1326 if (D->BssCount > 0) {
1327 SegDesc* FirstSeg = D->BssSeg [0];
1328 D->Header.BssBase = FirstSeg->Seg->PC;
1330 if (D->ZPCount > 0) {
1331 SegDesc* FirstSeg = D->ZPSeg [0];
1332 D->Header.ZPBase = FirstSeg->Seg->PC;
1335 /* If we have byte wise relocation and an alignment of 1, we can set
1336 * the "simple addressing" bit in the header.
1338 if ((D->Header.Mode & MF_RELOC_MASK) == MF_RELOC_BYTE &&
1339 (D->Header.Mode & MF_ALIGN_MASK) == MF_ALIGN_1) {
1340 D->Header.Mode = (D->Header.Mode & ~MF_ADDR_MASK) | MF_ADDR_SIMPLE;
1346 void O65WriteTarget (O65Desc* D, File* F)
1347 /* Write an o65 output file */
1349 char OptBuf [256]; /* Buffer for option strings */
1353 /* Place the filename in the control structure */
1354 D->Filename = GetString (F->Name);
1356 /* Check for unresolved symbols. The function O65Unresolved is called
1357 * if we get an unresolved symbol.
1359 D->Undef = 0; /* Reset the counter */
1360 CheckUnresolvedImports (O65Unresolved, D);
1362 /* We had unresolved symbols, cannot create output file */
1363 Error ("%u unresolved external(s) found - cannot create output file", D->Undef);
1366 /* Setup the segment arrays */
1367 O65SetupSegments (D, F);
1369 /* Setup additional stuff in the header */
1373 D->F = fopen (D->Filename, "wb");
1375 Error ("Cannot open `%s': %s", D->Filename, strerror (errno));
1378 /* Keep the user happy */
1379 Print (stdout, 1, "Opened `%s'...\n", D->Filename);
1381 /* Define some more options: A timestamp and the linker version */
1383 strcpy (OptBuf, ctime (&T));
1384 OptLen = strlen (OptBuf);
1385 while (OptLen > 0 && IsControl (OptBuf[OptLen-1])) {
1388 OptBuf[OptLen] = '\0';
1389 O65SetOption (D, O65OPT_TIMESTAMP, OptBuf, OptLen + 1);
1390 sprintf (OptBuf, "ld65 V%s", GetVersionAsString ());
1391 O65SetOption (D, O65OPT_ASM, OptBuf, strlen (OptBuf) + 1);
1393 /* Write the header */
1396 /* Write the text segment */
1397 O65WriteTextSeg (D);
1399 /* Write the data segment */
1400 O65WriteDataSeg (D);
1402 /* "Write" the bss segments */
1405 /* "Write" the zeropage segments */
1408 /* Write the undefined references list */
1409 O65WriteImports (D);
1411 /* Write the text segment relocation table */
1412 O65WriteTextReloc (D);
1414 /* Write the data segment relocation table */
1415 O65WriteDataReloc (D);
1417 /* Write the list of exports */
1418 O65WriteExports (D);
1420 /* Seek back to the start and write the updated header */
1421 fseek (D->F, 0, SEEK_SET);
1424 /* Close the file */
1425 if (fclose (D->F) != 0) {
1426 Error ("Cannot write to `%s': %s", D->Filename, strerror (errno));
1429 /* Reset the file and filename */