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vasm.c
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/* vasm.c main module for vasm */
/* (c) in 2002-2024 by Volker Barthelmann */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include "vasm.h"
#include "osdep.h"
#include "stabs.h"
#include "dwarf.h"
#define _VER "vasm 2.0"
const char *copyright = _VER " (c) in 2002-2024 Volker Barthelmann";
#ifdef AMIGA
static const char *_ver = "$VER: " _VER " " __AMIGADATE__ "\r\n";
#endif
/* The resolver will run another pass over the current section as long as any
label location or atom size has changed. It fails on reaching MAXPASSES,
which will hopefully never happen.
During the first FASTOPTPHASE passes all instructions of a section are
optimized at the same time. Thereafter the resolver enters a safe mode,
where only a single instruction is changed in every pass. */
#define MAXPASSES 1500
#define FASTOPTPHASE 200
/* global options */
char *output_format="test";
char *inname,*outname;
int chklabels,nocase,no_symbols,pic_check,unnamed_sections;
unsigned space_init;
taddr inst_alignment;
/* global module options */
int asciiout,secname_attr,warn_unalloc_ini_dat;
/* MNEMOHTABSIZE should be defined by cpu module */
#ifndef MNEMOHTABSIZE
#define MNEMOHTABSIZE 0x1000
#endif
hashtable *mnemohash;
char *filename,*debug_filename;
source *cur_src;
section *current_section,container_section;
int num_secs;
int debug,final_pass,exec_out,nostdout;
char *defsectname,*defsecttype;
taddr defsectorg;
int octetsperbyte;
int output_bitsperbyte,output_bytes_le,input_bytes_le;
unsigned long long taddrmask;
taddr taddrmin,taddrmax;
/* for output modules supporting stabs */
struct stabdef *first_nlist,*last_nlist;
char emptystr[]="";
char vasmsym_name[]="__VASM";
static FILE *outfile;
static int maxpasses=MAXPASSES;
static section *first_section,*last_section;
#if NOT_NEEDED
static section *prev_sec,*prev_org;
#endif
/* stack for push/pop-section directives */
#define SECSTACKSIZE 64
static section *secstack[SECSTACKSIZE];
static int secstack_index;
/* options */
static char *listname,*dep_filename;
static int add_uscore,dwarf,fail_on_warning;
static int verbose=1,auto_import=1;
static taddr sec_padding;
/* output */
static char *output_copyright;
static void (*write_object)(FILE *,section *,symbol *);
static int (*output_args)(char *);
void leave(void)
{
section *sec;
symbol *sym;
if(outfile){
fclose(outfile);
if (errors&&outname!=NULL)
remove(outname);
}
if(debug){
fprintf(stdout,"Sections:\n");
for(sec=first_section;sec;sec=sec->next)
print_section(stdout,sec);
fprintf(stdout,"Symbols:\n");
for(sym=first_symbol;sym;sym=sym->next){
print_symbol(stdout,sym);
fprintf(stdout,"\n");
}
}
exit_symbol();
if(errors||(fail_on_warning&&warnings))
exit(EXIT_FAILURE);
else
exit(EXIT_SUCCESS);
}
/* Convert all labels from an offset-section into absolute expressions. */
static void convert_offset_labels(void)
{
symbol *sym;
for (sym=first_symbol; sym; sym=sym->next) {
if (sym->type==LABSYM && sym->sec!=NULL && (sym->sec->flags&UNALLOCATED)) {
sym->type = EXPRESSION;
sym->expr = number_expr(sym->pc);
sym->sec = NULL;
}
}
}
/* Removes all unallocated (offset) sections from the list. */
static void remove_unalloc_sects(void)
{
section *prev,*sec;
for (sec=first_section,prev=NULL; sec; sec=sec->next) {
if (sec->flags&UNALLOCATED) {
if (prev)
prev->next = sec->next;
else
first_section = sec->next;
}
else
prev = sec;
}
last_section = prev;
}
/* convert reloffs-atom into one or more space-atoms */
static void roffs_to_space(section *sec,atom *p)
{
uint8_t padding[MAXPADSIZE];
utaddr space,padbytes,n;
sblock *sb = NULL;
if (eval_expr(p->content.roffs->offset,(taddr *)&space,sec,sec->pc) &&
(p->content.roffs->fillval==NULL ||
eval_expr(p->content.roffs->fillval,(taddr *)&n,sec,sec->pc))) {
if ((utaddr)sec->org + space > (utaddr)sec->pc) {
space = (utaddr)sec->org + space - (utaddr)sec->pc;
if (p->content.roffs->fillval == NULL) {
memcpy(padding,sec->pad,MAXPADSIZE);
padbytes = sec->padbytes;
}
else
padbytes = make_padding(n,padding,MAXPADSIZE*8);
if (space >= padbytes) {
n = balign(sec->pc,padbytes); /* alignment is automatic */
space -= n;
sec->pc += n; /* Important! Fix the PC for new alignment. */
sb = new_sblock(number_expr(space/padbytes),padbytes,0);
memcpy(sb->fill,padding,OCTETS(padbytes));
p->type = SPACE;
p->content.sb = sb;
p->align = padbytes;
space %= padbytes;
if (space > 0) {
/* fill the rest with zeros */
atom *a = new_space_atom(number_expr(space),1,0);
a->next = p->next;
p->next = a;
}
}
else {
p->type = SPACE;
p->content.sb = new_sblock(number_expr(space),1,0);
}
}
}
else
general_error(30); /* expression must be constant */
}
/* convert atom's alignment-bytes into space, then reset its alignment */
static void alignment_to_space(taddr nb,section *sec,atom *pa,atom *a)
{
atom *sa;
if (pa==NULL || nb<=0)
ierror(0);
if (a->type==SPACE && !a->content.sb->space && !(nb%a->content.sb->size)) {
/* take the fill pattern from this atom for alignment */
sa = new_space_atom(number_expr(nb/a->content.sb->size),
a->content.sb->size,a->content.sb->fill_exp);
}
else
sa = new_space_atom(number_expr(nb),1,0); /* fill with zeros */
pa->next = sa;
sa->next = a;
a->align = 1;
if (atom_size(sa,sec,sec->pc) != (size_t)nb) /* calculate atom size */
ierror(0);
}
/* append a new stabs (nlist) symbol/debugging definition */
static void new_stabdef(aoutnlist *nlist,section *sec)
{
struct stabdef *new = mymalloc(sizeof(struct stabdef));
new->next = NULL;
new->name.ptr = nlist->name;
new->type = nlist->type;
new->other = nlist->other;
new->desc = nlist->desc;
new->base = NULL;
if (nlist->value == NULL)
new->value = 0;
else if (!eval_expr(nlist->value,&new->value,sec,sec->pc)) {
int btype = find_base(nlist->value,&new->base,sec,sec->pc);
if (btype==BASE_ILLEGAL || btype==BASE_PCREL) {
new->base = NULL;
general_error(38); /* illegal relocation */
}
else if (new->base != NULL)
new->base->flags |= REFERENCED;
}
if (last_nlist)
last_nlist = last_nlist->next = new;
else
first_nlist = last_nlist = new;
}
/* emit internal debug info, triggered by a VASMDEBUG atom */
static void vasmdebug(const char *f,section *s,atom *a)
{
if (a->next != NULL) {
a = a->next;
printf("%s: (%s+%#llx) %2d:%lu(%u) ",
f,s->name,ULLTADDR(s->pc),a->type,(unsigned long)a->lastsize,a->changes);
print_atom(stdout,a);
putchar('\n');
}
}
static int resolve_section(section *sec)
{
taddr rorg_pc,org_pc;
int fastphase=FASTOPTPHASE;
int pass=0;
int done,extrapass,rorg;
size_t size;
atom *p;
do{
done=1;
rorg=0;
if (++pass>=maxpasses){
general_error(7,sec->name);
break;
}
extrapass=pass<=fastphase;
if(debug)
printf("resolve_section(%s) pass %d%s",sec->name,pass,
pass<=fastphase?" (fast)\n":"\n");
sec->pc=sec->org;
for(p=sec->first;p;p=p->next){
sec->pc=pcalign(p,sec->pc);
if(cur_src=p->src)
cur_src->line=p->line;
#if HAVE_CPU_OPTS
if(p->type==OPTS){
cpu_opts(p->content.opts);
}
else
#endif
if(p->type==RORG){
if(rorg)
general_error(43); /* reloc org is already set */
rorg_pc=*p->content.rorg;
org_pc=sec->pc;
sec->pc=rorg_pc;
sec->flags|=ABSOLUTE;
rorg=1;
}
else if(p->type==RORGEND&&rorg){
sec->pc=org_pc+(sec->pc-rorg_pc);
rorg_pc=0;
sec->flags&=~ABSOLUTE;
rorg=0;
}
else if(p->type==LABEL){
symbol *label=p->content.label;
if(label->type!=LABSYM)
ierror(0);
if(label->pc!=sec->pc){
if(debug)
printf("moving label %s at line %d from %#lx to %#lx\n",
label->name,p->line,
(unsigned long)label->pc,(unsigned long)sec->pc);
done=0;
label->pc=sec->pc;
}
}
else if(p->type==VASMDEBUG)
vasmdebug("resolve_section",sec,p);
if(pass>fastphase&&!done&&p->type==INSTRUCTION){
/* entered safe mode: optimize only one instruction every pass */
sec->pc+=p->lastsize;
continue;
}
if(p->changes>MAXSIZECHANGES){
/* atom changed size too frequently, set warning flag */
if(debug)
printf("setting resolve-warning flag for atom type %d at "
"line %d (%#lx)\n",p->type,p->line,(unsigned long)sec->pc);
sec->flags|=RESOLVE_WARN;
size=atom_size(p,sec,sec->pc);
sec->flags&=~RESOLVE_WARN;
}
else
size=atom_size(p,sec,sec->pc);
if(size!=p->lastsize){
if(debug)
printf("modify size of atom type %d at line %d (%#lx) from "
"%lu to %lu\n",p->type,p->line,(unsigned long)sec->pc,
(unsigned long)p->lastsize,(unsigned long)size);
done=0;
if(pass>fastphase)
p->changes++; /* now count size modifications of atoms */
else if(size>p->lastsize)
extrapass=0; /* no extra pass, when an atom became larger */
p->lastsize=size;
}
sec->pc+=size;
}
if(rorg){
sec->pc=org_pc+(sec->pc-rorg_pc);
sec->flags&=~ABSOLUTE; /* workaround for missing RORGEND */
}
/* Extend the fast-optimization phase, when there was no atom which
became larger than in the previous pass. */
if(extrapass) fastphase++;
}while(errors==0&&!done);
return pass;
}
static void bvunite(bvtype *dest,bvtype *src,size_t len)
{
len/=sizeof(bvtype);
for(;len>0;len--)
*dest++|=*src++;
}
static void resolve(void)
{
section *sec;
bvtype *todo;
int finished;
final_pass=0;
if(debug)
printf("resolve()\n");
for(num_secs=0, sec=first_section;sec;sec=sec->next)
sec->idx=num_secs++;
todo=mymalloc(BVSIZE(num_secs));
memset(todo,~(bvtype)0,BVSIZE(num_secs));
do{
finished=1;
for(sec=first_section;sec;sec=sec->next)
if(BTST(todo, sec->idx)){
int passes;
finished=0;
passes = resolve_section(sec);
BCLR(todo, sec->idx);
if(passes>1){
if(sec->deps)
bvunite(todo, sec->deps, BVSIZE(num_secs));
}
}
}while(!finished);
}
static void assemble(void)
{
taddr basepc,rorg_pc,org_pc;
struct dwarf_info dinfo;
section *sec;
atom *p,*pp;
int rorg;
convert_offset_labels();
if(dwarf){
dinfo.version=dwarf;
dinfo.producer=cnvstr(copyright,strchr(copyright,'(')-copyright-1);
source_debug_init(1,&dinfo);
}
final_pass=1;
rorg=0;
for(sec=first_section;sec;sec=sec->next){
source *lasterrsrc=NULL;
utaddr oldpc;
int lasterrline=0,ovflw=0;
int bss=strchr(sec->attr,'u')!=NULL;
for(sec->pc=sec->org,p=sec->first,pp=NULL;p;p=p->next){
basepc=sec->pc;
sec->pc=pcalign(p,sec->pc);
if(cur_src=p->src)
cur_src->line=p->line;
if(p->list&&p->list->atom==p){
p->list->sec=sec;
p->list->pc=sec->pc;
}
if(p->changes>MAXSIZECHANGES)
sec->flags|=RESOLVE_WARN;
/* print a warning on auto-aligned instructions or data */
if(sec->pc!=basepc){
atom *aa;
if(p->type==LABEL&&p->next!=NULL&&p->next->line==p->line)
aa=p->next; /* next atom in same line, look at it instead of label */
else
aa=p;
if(aa->type==INSTRUCTION)
general_error(50); /* instruction has been auto-aligned */
else if(aa->type==DATA||aa->type==DATADEF)
general_error(57); /* data has been auto-aligned */
if(rorg)
alignment_to_space(sec->pc-basepc,sec,pp,p);
}
else if(rorg)
p->align=1; /* disable ineffective alignment in relocated org block */
if(p->type==RORG){
rorg_pc=*p->content.rorg;
org_pc=sec->pc;
sec->pc=rorg_pc;
sec->flags|=ABSOLUTE;
rorg=1;
}
else if(p->type==RORGEND){
if(rorg){
sec->pc=org_pc+(sec->pc-rorg_pc);
rorg_pc=0;
sec->flags&=~ABSOLUTE;
rorg=0;
}
else
general_error(44); /* reloc org was not set */
}
else if(p->type==INSTRUCTION){
dblock *db;
cur_listing=p->list;
if(debug){
size_t sz=p->content.inst->code>=0?
instruction_size(p->content.inst,sec,sec->pc):0;
db=eval_instruction(p->content.inst,sec,sec->pc);
if(db->size!=sz)
ierror(0);
}
else
db=eval_instruction(p->content.inst,sec,sec->pc);
if(pic_check)
do_pic_check(db->relocs);
cur_listing=0;
if(dwarf){
if(cur_src->defsrc)
dwarf_line(&dinfo,sec,cur_src->defsrc->srcfile->index,
cur_src->defline+cur_src->line);
else
dwarf_line(&dinfo,sec,cur_src->srcfile->index,cur_src->line);
}
/*FIXME: sauber freigeben */
myfree(p->content.inst);
p->content.db=db;
p->type=DATA;
}
else if(p->type==DATADEF){
dblock *db;
cur_listing=p->list;
db=eval_data(p->content.defb->op,p->content.defb->bitsize,sec,sec->pc);
if(pic_check)
do_pic_check(db->relocs);
cur_listing=0;
/*FIXME: sauber freigeben */
myfree(p->content.defb);
p->content.db=db;
p->type=DATA;
}
else if(p->type==ROFFS)
roffs_to_space(sec,p);
#if HAVE_CPU_OPTS
else if(p->type==OPTS)
cpu_opts(p->content.opts);
#endif
else if(p->type==PRINTTEXT&&!nostdout)
printf("%s",p->content.ptext);
else if(p->type==PRINTEXPR&&!nostdout)
atom_printexpr(p->content.pexpr,sec,sec->pc);
else if(p->type==ASSERT){
assertion *ast=p->content.assert;
taddr val;
if(ast->assert_exp!=NULL) {
eval_expr(ast->assert_exp,&val,sec,sec->pc);
if(val==0)
general_error(47,ast->expstr,ast->msgstr?ast->msgstr:emptystr);
}
else /* ASSERT without expression, used for user-FAIL directives */
general_error(19,ast->msgstr?ast->msgstr:emptystr);
}
else if(p->type==NLIST)
new_stabdef(p->content.nlist,sec);
else if(p->type==VASMDEBUG)
vasmdebug("assemble",sec,p);
oldpc=sec->pc;
sec->pc+=atom_size(p,sec,sec->pc);
if((utaddr)sec->pc!=oldpc){
if((utaddr)(sec->pc-1)<oldpc||ovflw)
general_error(45); /* address space overflow */
ovflw=sec->pc==0;
}
if(bss&&((p->type==DATA&&p->content.db->size)||
(p->type==SPACE&&p->content.sb->size&&p->content.sb->fill_exp))){
if(lasterrsrc!=p->src||lasterrline!=p->line){
if(sec->flags&UNALLOCATED){
if(warn_unalloc_ini_dat)
general_error(54); /* initialized data in offset section */
}
else
general_error(31); /* initialized data in bss */
lasterrsrc=p->src;
lasterrline=p->line;
}
}
sec->flags&=~RESOLVE_WARN;
pp=p; /* prev atom */
}
/* leave RORG-mode, when section ends */
if(rorg){
sec->pc=org_pc+(sec->pc-rorg_pc);
rorg_pc=0;
sec->flags&=~ABSOLUTE;
rorg=0;
}
if(dwarf)
dwarf_end_sequence(&dinfo,sec);
}
remove_unalloc_sects();
if(dwarf)
dwarf_finish(&dinfo);
}
static void undef_syms(void)
{
symbol *sym;
for(sym=first_symbol;sym;sym=sym->next){
if(sym->type==IMPORT){
if (!auto_import&&!(sym->flags&(EXPORT|COMMON|WEAK)))
general_error(22,sym->name); /* undefined */
else if (sym->flags&XDEF)
general_error(86,sym->name); /* missing definition */
else if (!(sym->flags&(REFERENCED|COMMON|WEAK)))
general_error(61,sym->name); /* not referenced */
}
}
}
static void fix_labels(void)
{
symbol *sym,*base;
taddr val;
for(sym=first_symbol;sym;sym=sym->next){
/* turn all absolute mode labels into absolute symbols */
if((sym->flags&ABSLABEL)&&sym->type==LABSYM){
sym->type=EXPRESSION;
sym->flags&=~(TYPE_MASK|COMMON);
sym->sec=NULL;
sym->size=NULL;
sym->align=0;
sym->expr=number_expr(sym->pc);
}
/* expressions which are based on a label are turned into a new label */
else if(sym->type==EXPRESSION){
if(type_of_expr(sym->expr)==NUM&&!eval_expr(sym->expr,&val,NULL,0)){
if(find_base(sym->expr,&base,NULL,0)==BASE_OK){
/* turn into an offsetted label symbol from the base's section */
sym->type=base->type;
sym->sec=base->sec;
sym->pc=val;
sym->align=1;
if(sym->type==IMPORT&&(sym->flags&EXPORT))
general_error(81,sym->name); /* imported expr. in equate */
}else
general_error(53,sym->name); /* non-relocatable expr. in equate */
}
}
if (add_uscore && (sym->type==IMPORT || sym->flags&(EXPORT|COMMON|WEAK))) {
/* imported/exported symbol names receive a leading underscore */
size_t len = strlen(sym->name) + 1;
char *p = myrealloc(sym->name,len+1);
memmove(p+1,p,len);
p[0] = '_';
sym->name = p;
}
}
}
static void trim_uninitialized(section *sec)
{
for (; sec!=NULL; sec=sec->next) {
atom *a;
utaddr pc;
sec->last = NULL;
for (a=sec->first,pc=sec->org; a; a=a->next) {
pc = pcalign(a,pc);
pc += atom_size(a,sec,pc);
if (a->type==DATA ||
(a->type==SPACE && !(a->content.sb->flags & SPC_UNINITIALIZED))) {
/* remember last initialized atom and pc of this section */
sec->pc = pc;
sec->last = a;
}
}
}
}
void set_taddr(void)
{
taddrmask=MAKEMASK(bytespertaddr*BITSPERBYTE);
taddrmax=DEFMASK>>1;
taddrmin=~taddrmax;
octetsperbyte=(BITSPERBYTE+7)/8;
}
static void statistics(void)
{
unsigned long long size;
section *sec;
putchar('\n');
for(sec=first_section;sec;sec=sec->next){
size=(utaddr)(sec->pc)-(utaddr)(sec->org);
printf("%s(%s%lu):\t%12llu byte%c\n",sec->name,sec->attr,
(unsigned long)sec->align,size,size==1?' ':'s');
}
}
static struct {
const char *name;
int executable;
int (*init)(char **,void (**)(FILE *,section *,symbol *),int (**)(char *));
} out_formats[] = {
"aout",0,init_output_aout,
"bin",0,init_output_bin,
"cdef",0,init_output_cdef,
"dri",0,init_output_tos,
"elf",0,init_output_elf,
"gst",0,init_output_gst,
"hans",0,init_output_hans,
"hunk",0,init_output_hunk,
"hunkexe",1,init_output_hunk,
"ihex",0,init_output_ihex,
"o65",0,init_output_o65,
"o65exe",1,init_output_o65,
"pap",0,init_output_pap,
"srec",0,init_output_srec,
"test",0,init_output_test,
"tos",1,init_output_tos,
"vobj",0,init_output_vobj,
"woz",0,init_output_woz,
"xfile",1,init_output_xfile,
};
static int init_output(char *fmt)
{
static size_t num_out_formats=sizeof(out_formats)/sizeof(out_formats[0]);
size_t i;
output_bitsperbyte=BITSPERBYTE==8;
for(i=0;i<num_out_formats;i++){
if(!strcmp(fmt,out_formats[i].name)){
exec_out=out_formats[i].executable;
return out_formats[i].init(&output_copyright,&write_object,&output_args);
}
}
return 0;
}
static int init_main(void)
{
int i;
const char *mname;
hashdata data;
mnemohash=new_hashtable(MNEMOHTABSIZE);
i=0;
while(i<mnemonic_cnt){
data.idx=i;
mname=mnemonics[i++].name;
add_hashentry(mnemohash,mname,data);
while(i<mnemonic_cnt&&!strcmp(mname,mnemonics[i].name))
mnemonics[i++].name=mname; /* make sure the pointer is the same */
}
if(debug){
if(mnemohash->collisions)
fprintf(stderr,"*** %d mnemonic collisions!!\n",mnemohash->collisions);
}
new_include_path(emptystr); /* index 0: current work directory */
inst_alignment=INST_ALIGN;
set_taddr(); /* set initial taddr mask/min/max */
return 1;
}
static void include_main_source(void)
{
if (inname) {
char *filepart;
if ((filepart = get_filepart(inname)) != inname) {
/* main source is not in current dir., set compile-directory path */
compile_dir = cnvstr(inname,filepart-inname);
}
else
compile_dir = NULL;
if (include_source(inname)) {
setfilename(filepart);
setdebugname(inname);
}
}
else { /* no source file name given - read from stdin */
source *src;
if (src = stdin_source()) {
setfilename(src->name);
setdebugname(src->name);
}
}
}
/* searches a section by name and attr (if secname_attr set) */
section *find_section(const char *name,const char *attr)
{
section *p;
if(secname_attr){
for(p=first_section;p;p=p->next){
if(!strcmp(name,p->name) && !strcmp(attr,p->attr))
return p;
}
}
else{
for(p=first_section;p;p=p->next){
if(!strcmp(name,p->name))
return p;
}
}
return 0;
}
/* try to find a matching section name for the given attributes */
static char *name_from_attr(const char *attr)
{
while(*attr) {
switch(*attr++) {
case 'c': return "text";
case 'd': return "data";
case 'u': return "bss";
}
}
return emptystr;
}
static int move_label_to_sec(atom *lab,section *ns)
{
if (lab->type == LABEL) {
section *os = lab->content.label->sec; /* old section of label */
int deletable;
atom *a,*prev;
if ((os->flags & (LABELS_ARE_LOCAL|ABSOLUTE)) !=
(ns->flags & (LABELS_ARE_LOCAL|ABSOLUTE))) {
/* cannot move label into a section with different local/abs. flags */
general_error(82); /* label definition not allowed here */
return 0;
}
/* find previous atom, check if section becomes empty */
for (deletable=1,prev=NULL,a=os->first; a; a=a->next) {
if (a->next == lab)
prev = a;
if (a != lab) {
switch (a->type) {
case LABEL:
case DATA:
case INSTRUCTION:
case SPACE:
case DATADEF:
deletable = 0;
break;
}
}
}
/* unlink label-atom from its old section */
if (prev == NULL) {
if (os->first == lab)
os->first = os->last = NULL;
else
ierror(0); /* label atom not in its original section */
}
else {
if (os->last == lab)
os->last = prev;
prev->next = lab->next;
}
/* add label to new section */
ns->flags |= HAS_SYMBOLS;
lab->content.label->sec = ns;
lab->content.label->pc = ns->pc;
add_atom(ns,lab);
if (deletable) {
/* remove old section */
section *s;
if (first_section != os) {
for (s=first_section; s; s=s->next) {
if (s->next == os) {
if (last_section == os)
last_section = s;
s->next = os->next;
break;
}
}
}
else
first_section = os->next;
if (s == NULL)
ierror(0); /* section not found in list */
/* @@@ free section and atoms here */
}
}
else
ierror(0);
return 1;
}
/* set current section, remember last */
void set_section(section *s)
{
atom *a;
#if NOT_NEEDED
if (current_section!=NULL && !(current_section->flags & UNALLOCATED)) {
if (current_section->flags & ABSOLUTE)
prev_org = current_section;
else
prev_sec = current_section;
}
#endif
#if HAVE_CPU_OPTS
if (s!=NULL && !(s->flags & UNALLOCATED))
cpu_opts_init(s); /* set initial cpu opts before the first atom */
#endif
if (s!=NULL && current_section!=NULL && (a=current_section->last) != NULL) {
if (a->type==LABEL && a->src==cur_src && a->line==cur_src->line) {
/* make sure a label on the same line as a section directive is
moved into this new section */
if (move_label_to_sec(a,s))
general_error(83); /* label def. on the same line as a new section */
}
}
current_section = s;
}
/* creates a new section with given attributes and alignment;
does not switch to this section automatically */
section *new_section(const char *name,const char *attr,int align)
{
section *p;
if(unnamed_sections)
name=name_from_attr(attr);
if(p=find_section(name,attr))
return p;
p=mymalloc(sizeof(*p));
p->next=0;
p->deps=0;
p->name=mystrdup(name);
p->attr=mystrdup(attr);
p->align=align;
p->org=p->pc=0;
p->flags=0;
p->memattr=0;
memset(p->pad,0,MAXPADSIZE);
if(sec_padding)
p->padbytes=make_padding(sec_padding,p->pad,MAXPADSIZE*8);
else
p->padbytes=1;
if(last_section)
last_section=last_section->next=p;
else
first_section=last_section=p;
/* transfer saved atoms from intermediate container, when needed */
p->first=container_section.first;
p->last=container_section.last;
container_section.first=container_section.last=0;
return p;
}
/* create a dummy code section for each new ORG directive */
section *new_org(taddr org)
{
static unsigned cnt;
char buf[32];
section *sec;
sprintf(buf,"org%04u:%llx",++cnt,(unsigned long long)(utaddr)org);
sec = new_section(buf,"acrwx",1);
sec->org = sec->pc = org;
sec->flags |= ABSOLUTE; /* absolute destination address */
return sec;
}
/* switches current section to the section with the specified name */
void switch_section(const char *name,const char *attr)
{
section *p;
if(unnamed_sections)
name=name_from_attr(attr);
p=find_section(name,attr);
if(!p)
general_error(2,name);
else
set_section(p);
}
/* Switches current section to an offset section. Create a new section when
it doesn't exist yet or needs a different offset. */
void switch_offset_section(const char *name,taddr offs)
{
static unsigned long id;
char unique_name[14];
section *sec;
if (!name) {
if (offs != -1)
++id;
sprintf(unique_name,"OFFSET%06lu",id);
name = unique_name;
}
sec = new_section(name,"u",1);
sec->flags |= UNALLOCATED;
if (offs != -1)
sec->org = sec->pc = offs;
set_section(sec);
}
/* returns current_section or the syntax module's default section,
when undefined */
section *default_section(void)
{
section *sec = current_section;
if (!sec && defsecttype!=NULL) {
if (defsectname)
sec = new_section(defsectname,defsecttype,1);
else
sec = new_org(defsectorg);
set_section(sec);
}
return sec;
}
#if NOT_NEEDED
/* restore last relocatable section */
section *restore_section(void)
{
if (prev_sec)
return prev_sec;
if (defsectname && defsecttype)
return new_section(defsectname,defsecttype,1);
return NULL; /* no previous section or default section defined */
}