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t_o65.c
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t_o65.c
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/* $VER: vlink t_o65.c V0.16i (31.01.22)
*
* This file is part of vlink, a portable linker for multiple
* object formats.
* Copyright (c) 1997-2022 Frank Wille
*/
#include "config.h"
#ifdef O65
#define T_O65_C
#include "vlink.h"
#include "o65.h"
#include <time.h>
static int options_02(struct GlobalVars *,int,const char **,int *);
static int options_816(struct GlobalVars *,int,const char **,int *);
static int identify_02(struct GlobalVars *,char *,uint8_t *,unsigned long,bool);
static int identify_816(struct GlobalVars *,char *,uint8_t *,unsigned long,bool);
static void readconv(struct GlobalVars *,struct LinkFile *);
static int targetlink(struct GlobalVars *,struct LinkedSection *,
struct Section *);
static unsigned long headersize(struct GlobalVars *);
static void writeobject_02(struct GlobalVars *,FILE *);
static void writeobject_816(struct GlobalVars *,FILE *);
static void writeshared(struct GlobalVars *,FILE *);
static void writeexec_02(struct GlobalVars *,FILE *);
static void writeexec_816(struct GlobalVars *,FILE *);
struct FFFuncs fff_o6502 = {
"o65-02",
NULL,
NULL,
NULL,
options_02,
headersize,
identify_02,
readconv,
NULL,
targetlink,
NULL,
NULL,
NULL,
NULL,NULL,NULL,
writeobject_02,
writeshared,
writeexec_02,
bss_name,NULL,
0,
0, /* no small data */
0,
0,
RTAB_STANDARD,RTAB_STANDARD,
_LITTLE_ENDIAN_,
16,0,
FFF_BASEINCR
};
struct FFFuncs fff_o65816 = {
"o65-816",
NULL,
NULL,
NULL,
options_816,
headersize,
identify_816,
readconv,
NULL,
targetlink,
NULL,
NULL,
NULL,
NULL,NULL,NULL,
writeobject_816,
writeshared,
writeexec_816,
bss_name,NULL,
0,
0, /* no small data */
0,
0,
RTAB_STANDARD,RTAB_STANDARD,
_LITTLE_ENDIAN_,
24,0,
FFF_BASEINCR
};
static struct ar_info ai; /* for scanning library archives */
struct ImportList o65implist; /* list of externally referenced symbol names */
static int o65size; /* words are 2 or 4 bytes */
static uint8_t *optr; /* current object file pointer */
static long olen; /* remaining bytes in object file */
static const uint8_t o65magic[] = { 1,0,'o','6','5',0 };
/* options */
static int o65outsize=2; /* word-size for output file - always 2 */
static size_t o65stack; /* highest stack size */
static uint8_t o65paged; /* page-wise relocation */
static uint8_t o65align; /* alignment 0,1,2 or 3 (o65paged) */
static uint8_t o65cpu; /* 6502 cpu code */
static uint8_t o65bsszero; /* bss must be zeroed by loader */
static int fopts; /* bit 0: enable file options,
bit 1: includes creation data */
static const char *fopt_name,*fopt_author;
static int check_cpu_name(const char *name)
{
static const char *cpunames[] = {
"6502","65c02","65sc02","65ce02","nmos6502","65816"
};
int i;
for (i=0; i<sizeof(cpunames)/sizeof(cpunames[0]); i++) {
if (!stricmp(name,cpunames[i]))
return i;
}
return 0xff;
}
static int options(int cpu816,struct GlobalVars *gv,
int argc,const char *argv[],int *i)
{
long val;
int n;
if (!strcmp(argv[*i],"-o65-align")) {
uint8_t abits;
n = sscanf(get_arg(argc,argv,i),"%li",&val);
if (n!=1 || val<0 || (val>2 && val!=8))
error(130,argv[*i-1]); /* bad assignment */
abits = val>2 ? 3 : val;
if (abits > o65align)
o65align = abits;
}
else if (!strcmp(argv[*i],"-o65-author") && (*i+1)<argc) {
fopts |= 1;
fopt_author = argv[++*i];
}
else if (!strcmp(argv[*i],"-o65-bsszero")) {
o65bsszero = 1;
}
else if (!cpu816 && !strncmp(argv[*i],"-o65-cpu",8)) {
if (argv[*i][8] == '=') {
n = sscanf(&argv[*i][9],"%li",&val);
if (n!=1 || val<0 || val>15)
error(130,argv[*i]); /* bad assignment */
o65cpu = val;
}
else if (argv[*i][8]=='\0' && (*i+1)<argc) {
if ((o65cpu = check_cpu_name(argv[++*i])) > 15)
error(130,argv[*i]); /* bad assignment */
}
else
return 0;
}
else if (!strcmp(argv[*i],"-o65-fopts")) {
fopts |= 3;
}
else if (!strcmp(argv[*i],"-o65-name") && (*i+1)<argc) {
fopts |= 1;
fopt_name = argv[++*i];
}
else if (!strcmp(argv[*i],"-o65-paged")) {
o65paged = 1;
o65align = 3;
}
else if (!strcmp(argv[*i],"-o65-stack")) {
n = sscanf(get_arg(argc,argv,i),"%li",&val);
if (n!=1 || val>(long)o65stack)
o65stack = val;
}
else
return 0;
return 1;
}
static int options_02(struct GlobalVars *gv,int argc,const char **argv,int *i)
{
return options(0,gv,argc,argv,i);
}
static int options_816(struct GlobalVars *gv,int argc,const char **argv,int *i)
{
return options(1,gv,argc,argv,i);
}
/*****************************************************************/
/* Read o65 */
/*****************************************************************/
static uint8_t getbyte(void)
{
olen--;
return *optr++;
}
static uint16_t getword(void)
{
uint16_t w = read16le(optr);
optr += 2;
olen -= 2;
return w;
}
static uint32_t getsize(void)
{
uint32_t s = o65size==2 ? read16le(optr) : read32le(optr);
optr += o65size;
olen -= o65size;
return s;
}
static void skipbytes(size_t n)
{
optr += n;
olen -= n;
}
static uint8_t *skipstring(void)
{
uint8_t *p = optr;
while (*optr++ != '\0')
olen--;
olen--;
return p;
}
static void o65_newsec(struct o65info *o65,int secno,uint8_t align)
{
/* section attributes for: .text, .data, .bss, .zero */
static uint8_t types[NSECS] = {
ST_CODE,ST_DATA,ST_UDATA,ST_UDATA
};
static uint8_t prots[NSECS] = {
SP_READ|SP_EXEC,SP_READ|SP_WRITE,SP_READ|SP_WRITE,SP_READ|SP_WRITE
};
static uint8_t flags[NSECS] = {
SF_ALLOC,SF_ALLOC,SF_ALLOC|SF_UNINITIALIZED,SF_ALLOC|SF_UNINITIALIZED
};
static const char *names[NSECS] = {
TEXTNAME,DATANAME,BSSNAME,ZERONAME
};
if (o65->len[secno] > 0) {
struct LinkFile *lf = o65->object->lnkfile;
if (types[secno]!=ST_UDATA && (long)o65->len[secno]>=olen)
error(49,lf->pathname,names[secno],lf->objname); /* illegal sec.offs. */
o65->data[secno] = optr;
o65->sec[secno] = add_section(o65->object,names[secno],
types[secno]!=ST_UDATA ? optr : NULL,
o65->len[secno],types[secno],flags[secno],
prots[secno],align,FALSE);
if (types[secno] != ST_UDATA) {
skipbytes(o65->len[secno]);
if (olen < 0)
error(15,lf->pathname,names[secno],lf->objname); /* unexpected end */
}
}
else {
o65->data[secno] = NULL;
o65->sec[secno] = NULL;
}
}
static void o65_makesections(struct o65info *o65)
{
uint8_t align = MO65_ALIGN(o65->mode);
int i;
if (align > 2)
align = 8; /* page alignment */
/* create all sections which have a size > 0 */
for (i=0; i<NSECS; i++)
o65_newsec(o65,i,align);
}
static int o65_getrelocs(struct GlobalVars *gv,struct o65info *o65,int secno)
{
struct FFFuncs *ff = fff[o65->object->lnkfile->format];
int pagedrel = o65->mode & MO65_PAGED;
struct Section *sec = o65->sec[secno];
uint8_t *d = o65->data[secno];
struct Section *rsec;
long off=-1,b;
char *xname;
unsigned sz;
lword a,m;
int i;
while (olen>0 && (b = getbyte())) {
if (sec == NULL) {
error(143,o65->object->lnkfile->pathname,secno); /* unexpected */
break;
}
while (b == 0xff) {
off += 254;
b = getbyte();
}
off += b;
b = getbyte(); /* reloc type and segment */
i = R65SEG(b);
if (i == UNDSEGID) {
/* undefined - lookup external reference in namelist */
unsigned idx = getsize();
rsec = NULL;
if (idx >= o65->namecount) {
error(139,getobjname(o65->object),idx); /* index out of range */
return 0;
}
else
xname = o65->names[idx];
}
else {
xname = NULL;
rsec = (i>=MINSEGID && i<=MAXSEGID) ? o65->sec[i-MINSEGID] : NULL;
if (rsec == NULL) {
error(52,o65->object->lnkfile->pathname,
sec->name,getobjname(o65->object),i); /* non existing sect. */
return 0;
}
}
/* read the addend */
switch (R65TYPE(b)) {
case 0x80: /* 16-bit address */
a = read16le(d+off);
m = -1;
sz = 16;
break;
case 0x40: /* address high-byte */
a = (((lword)*(d+off)) << 8) | (pagedrel ? 0 : getbyte());
m = 0xff00;
sz = 8;
break;
case 0x20: /* address low-byte */
a = *(d+off);
m = 0xff;
sz = 8;
break;
case 0xc0: /* 24-bit segment address */
a = read16le(d+off) | (((lword)*(d+off+2)) << 16);
m = -1;
sz = 24;
break;
case 0xa0: /* segment-byte of 24-bit address */
a = getword() | (((lword)*(d+off)) << 16);
m = 0xff0000;
sz = 8;
break;
default: /* illegal relocation type */
error(14,getobjname(o65->object),ff->tname,
(int)R65TYPE(b),sec->name,(unsigned)off);
return 0;
}
if (i != UNDSEGID)
a -= o65->base[i-MINSEGID]; /* fix addend for base address 0 */
/* add new relocation or external reference for current section */
addreloc(sec,newreloc(gv,sec,xname,rsec,0,off,R_ABS,a),0,sz,m);
}
return 1;
}
static int o65_read(struct GlobalVars *gv,struct LinkFile *lf,
uint8_t *p,unsigned long plen)
{
struct FFFuncs *ff = fff[lf->format];
struct o65info o65;
size_t stksize;
uint8_t b;
int i;
optr = p;
olen = plen;
chained:
if (olen < sizeof(o65magic)+2 || memcmp(optr,o65magic,sizeof(o65magic))!=0) {
error(41,lf->pathname,ff->tname); /* corrupt */
return 0;
}
optr += sizeof(o65magic);
olen -= sizeof(o65magic);
o65.mode = getword(); /* mode follows the magic-id */
/* determine word-size in o65 structures */
o65size = (o65.mode & MO65_LONG) ? 4 : 2;
if (olen <= 9 * o65size) {
error(41,lf->pathname,ff->tname); /* corrupt */
return 0;
}
/* read section base addresses and sizes */
for (i=0; i<NSECS; i++) {
o65.base[i] = getsize();
o65.len[i] = getsize();
}
/* remember stack size, when higher than current value */
stksize = getsize();
if (stksize > o65stack)
o65stack = stksize;
/* skip header options */
while (olen > 0 && (b = getbyte())) {
switch (getbyte()) {
case HOPT_FNAME:
lf->objname = (char *)optr;
default:
skipbytes(b-2);
break;
}
}
/* create the object unit and add all sections with content */
o65.object = create_objunit(gv,lf,lf->objname);
o65_makesections(&o65);
/* build list of undefined reference names */
o65.namecount = olen>o65size ? getsize() : 0;
if (o65.namecount) {
o65.names = alloc(o65.namecount * sizeof(char *));
for (i=0; i<o65.namecount; i++)
o65.names[i] = (char *)skipstring();
}
else
o65.names = NULL;
/* read text and data section relocs */
if (olen>0 && o65_getrelocs(gv,&o65,TSEC)) {
if (olen>0 && o65_getrelocs(gv,&o65,DSEC)) {
/* finally read exported symbols */
if (olen>=o65size && (i = getsize())>0) do {
struct Section *sec;
int32_t val;
uint8_t type;
char *name;
name = (char *)skipstring();
b = getbyte(); /* segment id */
val = getsize(); /* symbol value */
if (b == ABSSEGID) {
/* absolute value */
sec = abs_section(o65.object);
type = SYM_ABS;
}
else if (b>=MINSEGID && b<=MAXSEGID) {
sec = o65.sec[b-MINSEGID];
val -= o65.base[b-MINSEGID]; /* fix for base address 0 */
type = SYM_RELOC;
}
else
sec = NULL;
if (sec != NULL) {
addsymbol(gv,sec,name,NULL,val,type,0,SYMI_NOTYPE,
SYMB_GLOBAL,0,TRUE);
}
else
error(53,lf->pathname,name,getobjname(o65.object),(int)b);
} while (--i>0 && olen>0);
}
}
if (o65.namecount)
free(o65.names);
/* done, enqueue object into the linking process */
add_objunit(gv,o65.object,FALSE);
if (o65.mode & MO65_CHAIN) {
/* another o65 object is chained, read it */
error(140,lf->pathname,getobjname(o65.object));
goto chained;
}
if (olen != 0) {
/* otherwise the file is likely corrupt when remaining size is non-zero */
error(41,lf->pathname,ff->tname);
return 0;
}
return 1;
}
static int identify(char *name,uint8_t *p,unsigned long plen,
bool lib,int cpu816)
/* identify an o65 object file or executable */
{
bool arflag = FALSE;
uint16_t mode;
if (ar_init(&ai,(char *)p,plen,name)) {
/* library archive detected, extract 1st archive member */
arflag = TRUE;
if (!(ar_extract(&ai))) {
error(38,name); /* Empty archive ignored */
return ID_IGNORE;
}
p = ai.data;
}
if (plen < sizeof(o65magic)+2 || memcmp(p,o65magic,sizeof(o65magic))!=0)
return ID_UNKNOWN;
mode = read16le(p + sizeof(o65magic));
if (cpu816 == !(mode & MO65_65816))
return ID_UNKNOWN;
if (!arflag)
return (mode & MO65_OBJ) ? ID_OBJECT : ID_EXECUTABLE;
return ID_LIBARCH;
}
static int identify_02(struct GlobalVars *gv,char *name,uint8_t *p,
unsigned long plen,bool lib)
{
return identify(name,p,plen,lib,0);
}
static int identify_816(struct GlobalVars *gv,char *name,uint8_t *p,
unsigned long plen,bool lib)
{
return identify(name,p,plen,lib,1);
}
static void readconv(struct GlobalVars *gv,struct LinkFile *lf)
{
if (lf->type == ID_LIBARCH) {
if (ar_init(&ai,(char *)lf->data,lf->length,lf->filename)) {
while (ar_extract(&ai)) {
lf->objname = allocstring(ai.name);
if (!o65_read(gv,lf,ai.data,ai.size))
break;
}
}
else
ierror("o65 readconv(): archive %s corrupted since last access",
lf->pathname);
}
else {
lf->objname = lf->filename;
o65_read(gv,lf,lf->data,lf->length);
}
}
/*****************************************************************/
/* Link o65 */
/*****************************************************************/
static int is_bss_name(const char *p)
{
size_t len = strlen(p);
while (len >= 3) {
if (toupper((unsigned char)p[0]) == 'B' &&
toupper((unsigned char)p[1]) == 'S' &&
toupper((unsigned char)p[2]) == 'S')
return 1;
p++;
len--;
}
return 0;
}
static int targetlink(struct GlobalVars *gv,struct LinkedSection *ls,
struct Section *s)
/* returns 1, if target requires the combination of the two sections, */
/* returns -1, if target doesn't want to combine them, */
/* returns 0, if target doesn't care - standard linking rules are used. */
{
/* o65 requires merging of all text, data, bss and zero-page sections! */
if (ls->type == s->type) {
if (s->type == ST_UDATA) {
/* bss and zero are both uninitialized, make sure not to mix them */
if (is_bss_name(ls->name) != is_bss_name(s->name))
return -1;
}
return 1; /* otherwise merge sections of same type */
}
return 0;
}
/*****************************************************************/
/* Write o65 */
/*****************************************************************/
static void fwsize(FILE *f,unsigned w)
{
if (o65size == 2)
fwrite16le(f,w);
else if (o65size == 4)
fwrite32le(f,w);
else
ierror("fwsize: %d",o65size);
}
static void collect_sections(struct GlobalVars *gv,struct LinkedSection **secs)
{
struct LinkedSection *ls;
int i,idx;
for (i=0; i<NSECS; secs[i++]=NULL);
for (ls=(struct LinkedSection *)gv->lnksec.first;
ls->n.next!=NULL; ls=(struct LinkedSection *)ls->n.next) {
if (ls->flags & SF_ALLOC) {
switch (ls->type) {
case ST_UNDEFINED:
/* @@@ discard undefined sections - they are empty anyway */
ls->flags &= ~SF_ALLOC;
break;
case ST_CODE:
if (secs[TSEC]==NULL)
secs[TSEC] = ls;
else
error(138,fff[gv->dest_format]->tname,TEXTNAME,
secs[TSEC]->name,ls->name);
break;
case ST_DATA:
if (secs[DSEC]==NULL)
secs[DSEC] = ls;
else
error(138,fff[gv->dest_format]->tname,DATANAME,
secs[DSEC]->name,ls->name);
break;
case ST_UDATA:
idx = is_bss_name(ls->name) ? BSEC : ZSEC;
if (secs[idx]==NULL)
secs[idx] = ls;
else
error(138,fff[gv->dest_format]->tname,idx==BSEC?BSSNAME:ZERONAME,
secs[idx]->name,ls->name);
break;
default:
ierror("o65: Illegal section type %d (%s)",(int)ls->type,ls->name);
break;
}
}
}
/* set highest alignment from all sections */
if (!o65paged) {
for (i=0; i<NSECS; i++) {
if (secs[i] && secs[i]->alignment > o65align)
o65align = secs[i]->alignment;
}
if (o65align > 2)
o65align = 3;
}
else
o65align = 3; /* paged relocs imply alignment of 256 bytes */
}
static int o65_simple(struct LinkedSection **secs)
{
/* return true, when text, data, bss are consecutive */
lword addr;
int i;
for (i=0; i<ZSEC; i++) {
if (secs[i] != NULL)
break;
}
if (i < ZSEC) {
for (addr=secs[i]->base; i<ZSEC; i++) {
if (secs[i] != NULL) {
if ((lword)secs[i]->base != addr)
return 0;
addr += secs[i]->size;
}
}
}
return 1;
}
static size_t o65_fopt(FILE *f,int type,const char *data,size_t len)
{
if (len > 253) {
if (f != NULL)
error(141,(unsigned)len+2); /* max file option size exceeded */
return 0;
}
if (f != NULL) {
fwrite8(f,len+2);
fwrite8(f,type);
fwritex(f,data,len);
}
return len+2;
}
static size_t o65_genfopts(struct GlobalVars *gv,FILE *f)
{
size_t len = 0;
if (fopts) {
if ((fopts & 2) && fopt_name==NULL)
fopt_name = gv->dest_name;
if (fopt_name)
len += o65_fopt(f,0,fopt_name,strlen(fopt_name)+1);
if (fopts & 2) {
/* write linker name and version */
char creator[32];
snprintf(creator,32,PNAME " %s",version_str);
len += o65_fopt(f,2,creator,strlen(creator)+1);
}
if (fopt_author)
len += o65_fopt(f,3,fopt_author,strlen(fopt_author)+1);
if (fopts & 2) {
/* write creation date */
char datebuf[32];
time_t now;
(void)time(&now);
strftime(datebuf,32,"%a %b %d %H:%M:%S %Z %Y",localtime(&now));
len += o65_fopt(f,4,datebuf,strlen(datebuf)+1);
}
}
return len;
}
static void o65_header(struct GlobalVars *gv,FILE *f,
struct LinkedSection **secs,int exe,int cpu816)
{
uint16_t mode;
int i;
o65size = o65outsize;
fwritex(f,o65magic,sizeof(o65magic));
/* construct mode word */
mode = o65align & 3;
if (cpu816)
mode |= MO65_65816; /* native 65816 */
else
mode |= (o65cpu & 15) << 4;
if (o65paged)
mode |= MO65_PAGED; /* paged (simpler) relocations */
if (exe) {
if (o65bsszero)
mode |= MO65_BSSZERO;
if (o65_simple(secs))
mode |= MO65_SIMPLE; /* sections can be loaded consecutive into memory */
}
else
mode |= MO65_OBJ; /* object file, not executable */
fwrite16le(f,mode);
/* section base addresses and sizes */
for (i=0; i<NSECS; i++) {
fwsize(f,secs[i] ? secs[i]->base : 0);
fwsize(f,secs[i] ? secs[i]->size : 0);
}
fwsize(f,o65stack);
/* file options */
o65_genfopts(gv,f);
fwrite8(f,0);
}
static void o65_writesections(struct GlobalVars *gv,FILE *f,
struct LinkedSection **secs)
{
fwritefullsect(gv,f,secs[TSEC]);
fwritefullsect(gv,f,secs[DSEC]);
}
static void o65_addimport(struct Reloc *xref)
{
struct ImportNode **chain,*new;
chain = &o65implist.hashtab[elf_hash(xref->xrefname)%IMPHTABSIZE];
while (new = *chain) {
if (!strcmp(new->name,xref->xrefname))
return; /* name already present */
chain = &new->hashchain;
}
*chain = new = alloczero(sizeof(struct ImportNode));
new->name = xref->xrefname;
addtail(&o65implist.l,&new->n);
o65implist.entries++;
}
static void o65_genxreftab(struct GlobalVars *gv,struct LinkedSection **secs)
{
unsigned i;
initlist(&o65implist.l);
o65implist.hashtab = alloczero(IMPHTABSIZE*sizeof(struct ImportNode *));
o65implist.entries = 0;
/* collect unique import names in a list */
for (i=TSEC; i<=DSEC; i++) {
if (secs[i] != NULL) {
struct Reloc *rel;
for (rel=(struct Reloc *)secs[i]->xrefs.first; rel->n.next!=NULL;
rel=(struct Reloc *)rel->n.next) {
/* put imported symbol names into a list */
if (rel->flags & RELF_INTERNAL)
continue; /* internal relocations will never be exported */
o65_addimport(rel);
/* write addend to section */
writesection(gv,secs[i]->data,rel->offset,rel,rel->addend);
}
}
}
}
static unsigned o65_findxref(const char *name)
{
struct ImportNode **chain = &o65implist.hashtab[elf_hash(name)%IMPHTABSIZE];
struct ImportNode *imp;
while (imp = *chain) {
if (!strcmp(name,imp->name))
return imp->idx;
chain = &imp->hashchain;
}
ierror("o65_findxref: %s disappeared",name);
return ~0;
}
static void o65_writexreftab(FILE *f)
{
struct ImportNode *imp;
unsigned i = 0;
fwsize(f,o65implist.entries);
while (imp = (struct ImportNode *)remhead(&o65implist.l)) {
imp->idx = i++;
fwritex(f,imp->name,strlen(imp->name)+1);
o65implist.entries--;
}
if (o65implist.entries)
ierror("o65_xreftable: remaining entries: %u",o65implist.entries);
}
static uint8_t o65_rtype(struct RelocInsert *ri)
{
if (ri->next!=NULL || ri->bpos!=0)
return 0;
if ((ri->mask & 0xffffff) != 0xffffff && ri->bsiz==8) {
if ((ri->mask & 0xffffff) == 0xff0000)
return 0xa0; /* segment-byte of 24-bit address */
else if ((ri->mask & 0xffff) == 0xff00)
return 0x40; /* high-byte of 16-bit address */
else if (ri->mask == 0xff)
return 0x20; /* low-byte of 16-bit address */
}
else if (ri->bsiz == 8)
return 0x20; /* probably an 8-bit xref to an absolute value */
else if (ri->bsiz == 16)
return 0x80; /* 16-bit address */
else if (ri->bsiz == 24)
return 0xc0; /* 24-bit address */
return 0;
}
static uint8_t o65_segid(struct LinkedSection **secs,struct LinkedSection *ls)
{
int i;
for (i=0; i<NSECS; i++) {
if (secs[i] == ls)
return MINSEGID + i;
}
ierror("o65_segid: no o65 section: %s",ls->name);
return 0;
}
static void o65_writerelocs(struct GlobalVars *gv,FILE *f,
struct LinkedSection **secs)
{
const char *fn = "o65_writerelocs(): ";
int i;
for (i=TSEC; i<=DSEC; i++) {
if (secs[i] != NULL) {
struct Reloc *rel,*xref,*r;
int lastoffs = -1;
int newoffs,diff;
uint8_t type,segid;
lword a;
sort_relocs(&secs[i]->relocs);
rel = (struct Reloc *)secs[i]->relocs.first;
sort_relocs(&secs[i]->xrefs);
xref = (struct Reloc *)secs[i]->xrefs.first;
while (rel->n.next || xref->n.next) {
if (xref->n.next==NULL || (rel->n.next && rel->offset<xref->offset)) {
r = rel;
newoffs = r->offset;
rel = (struct Reloc *)rel->n.next;
}
else {
r = xref;
newoffs = r->offset;
xref = (struct Reloc *)xref->n.next;
}
/* only some ABS address relocations are supported */
if (r->rtype==R_ABS && (type = o65_rtype(r->insert))) {
if (r->xrefname) {
segid = UNDSEGID;
a = r->addend;
}
else {
segid = o65_segid(secs,r->relocsect.lnk);
a = r->relocsect.lnk->base + r->addend;
}
/* write offset to next relocation field */
if ((diff = newoffs - lastoffs) <= 0)
ierror("%s%s reloc list not sorted: %d <= last (%d)",
fn,secs[i]->name,newoffs,lastoffs);
lastoffs = newoffs;
while (diff > 254) {
fwrite8(f,255);
diff -= 254;
}
fwrite8(f,diff);
/* write reloc-type and additional bytes */
fwrite8(f,type|segid);
if (segid == UNDSEGID)
fwsize(f,o65_findxref(r->xrefname));
switch (type) {
case 0x40: /* address high-byte */
if (!o65paged)
fwrite8(f,a&0xff); /* write low-byte */