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output_gst.c
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output_gst.c
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/* gst.c Atari GST output driver for vasm */
/* (c) in 2023 by Frank Wille */
#include "vasm.h"
#include "output_gst.h"
#if defined(OUTGST)
static char *copyright="vasm GST output module 0.1 (c) 2023 Frank Wille";
static rlist **sorted_rlist;
static size_t bss_bytes;
static void gst_string(FILE *f,const char *str)
{
size_t len = strlen(str);
if (len > 0xff)
len = 0xff;
fw8(f,len);
fwdata(f,str,len);
}
static void gst_source(FILE *f,const char *str)
{
GSTOUT(f,GST_SOURCE);
gst_string(f,str);
}
static void gst_define(FILE *f,int id,const char *str)
{
GSTOUT(f,GST_DEFINE);
fw16(f,id,1);
gst_string(f,str);
}
static void gst_section(FILE *f,section *sec)
{
if (sec->flags & ABSOLUTE) {
GSTOUT(f,GST_ORG);
fw32(f,sec->org,1);
}
else {
GSTOUT(f,GST_SECTION);
fw16(f,-(int)sec->idx,1);
}
}
static void gst_common(FILE *f,int refid)
{
GSTOUT(f,GST_COMMON);
fw16(f,refid,1);
}
static void gst_offset(FILE *f,size_t offs)
{
GSTOUT(f,GST_OFFSET);
fw32(f,offs,1);
}
static void gst_xref(FILE *f,int32_t add,unsigned rule,int refid)
{
GSTOUT(f,GST_XREF);
fw32(f,add,1);
fw8(f,rule);
fw8(f,'+');
fw16(f,refid,1);
fw8(f,GSTESC);
}
static void gst_xdef(FILE *f,const char *name,int32_t val,int refid)
{
GSTOUT(f,GST_XDEF);
gst_string(f,name);
fw32(f,val,1);
fw16(f,refid,1);
}
static void gst_dobss(FILE *f)
{
if (bss_bytes) {
gst_offset(f,bss_bytes);
bss_bytes = 0;
}
}
static void gst_data(FILE *f,void *data,size_t len)
{
uint8_t *p = data;
gst_dobss(f);
while (len--) {
if (*p == GSTESC)
fw8(f,GSTESC); /* GST escape code has to be doubled */
fw8(f,*p++);
}
}
static int define_section_names(FILE *f,section *sec)
{
int id = 1;
for (; sec; sec=sec->next) {
if (!(sec->flags & ABSOLUTE)) {
gst_define(f,-id,sec->name); /* sections have negative ids */
sec->idx = id++;
}
}
return id;
}
static void define_import_names(FILE *f,symbol *sym,int secid)
{
int id = 1;
for (; sym; sym=sym->next) {
if (sym->type == IMPORT) {
if (sym->flags & COMMON) {
gst_define(f,-secid,sym->name); /* define common symbol as section */
sym->idx = secid++;
}
else {
if (sym->flags & WEAK)
output_error(10,sym->name); /* treat weak symbol as global */
gst_define(f,id,sym->name);
sym->idx = id++;
}
}
else
sym->idx = 0;
}
}
static int offscmp(const void *left,const void *right)
{
rlist *rl1 = *(rlist **)left;
rlist *rl2 = *(rlist **)right;
return (int)((nreloc *)rl1->reloc)->byteoffset
- (int)((nreloc *)rl2->reloc)->byteoffset;
}
static int get_sorted_rlist(atom *a)
{
static int max_relocs_per_atom = 0;
rlist *rl = get_relocs(a);
int nrel = 0;
while (rl) {
if (nrel >= max_relocs_per_atom) {
max_relocs_per_atom++;
sorted_rlist = myrealloc(sorted_rlist,
max_relocs_per_atom * sizeof(rlist **));
}
sorted_rlist[nrel++] = rl;
rl = rl->next;
}
if (nrel > 1)
qsort(sorted_rlist,nrel,sizeof(rlist *),offscmp);
return nrel;
}
static void stream_data(FILE *f,section *sec,atom *a,size_t offs,size_t len)
{
if (a->type == DATA) {
dblock *db = a->content.db;
if (offs + len > db->size)
ierror(0);
gst_data(f,db->data+offs,len);
}
else if (a->type == SPACE) {
sblock *sb = a->content.sb;
if (get_sec_type(sec)==S_BSS || (sb->flags & SPC_UNINITIALIZED)) {
/* uninitialized space - remember number of consecutive bytes */
bss_bytes += len;
}
else {
/* initialized space with a repeating pattern */
int i;
if ((offs % sb->size) || (len % sb->size)
|| offs+len > sb->size*sb->space)
ierror(0);
for (i=offs; i<len; i+=sb->size)
gst_data(f,sb->fill,sb->size);
}
}
}
static void stream_section(FILE *f,section *sec)
{
utaddr pc,npc;
atom *a;
gst_section(f,sec);
for (npc=sec->org,a=sec->first; a; a=a->next) {
size_t offs = 0;
int nrel,i;
pc = fwpcalign(f,a,sec,npc);
npc = pc + atom_size(a,sec,pc);
nrel = get_sorted_rlist(a);
for (i=0; i<nrel; i++) {
if (sorted_rlist[i]->type <= LAST_STANDARD_RELOC) {
nreloc *r = (nreloc *)sorted_rlist[i]->reloc;
size_t roffs = r->byteoffset;
uint8_t rule = r->size >> 3;
symbol *sym = r->sym;
stream_data(f,sec,a,offs,roffs-offs);
offs = roffs;
if (r->bitoffset==0 && r->mask==DEFMASK && !(r->size&7)
&& (rule==1 || rule==2 || rule==4)) {
int refid;
if (sym->type == IMPORT)
refid = (sym->flags & COMMON) ? -(int)sym->idx : sym->idx;
else if (sym->type==LABSYM && sym->sec)
refid = -(int)sym->sec->idx;
else
ierror(0);
switch (sorted_rlist[i]->type) {
case REL_ABS:
rule |= GSTR_UNSIGNED | GSTR_ABS;
break;
case REL_PC:
rule |= GSTR_SIGNED | GSTR_PCREL;
break;
default:
unsupp_reloc_error(sorted_rlist[i]);
break;
}
gst_xref(f,r->addend,rule,refid);
offs += rule & 7; /* reloc field size */
}
else
unsupp_reloc_error(sorted_rlist[i]);
}
else
unsupp_reloc_error(sorted_rlist[i]);
}
stream_data(f,sec,a,offs,(npc-pc)-offs);
}
gst_dobss(f); /* write last uninitialized block with GST_OFFSET */
}
static void common_symbols(FILE *f,symbol *sym)
{
for (; sym; sym=sym->next) {
if (sym->type==IMPORT && (sym->flags & COMMON)) {
gst_common(f,-(int)sym->idx);
gst_offset(f,get_sym_size(sym));
}
}
}
static void export_symbols(FILE *f,symbol *sym)
{
for (; sym; sym=sym->next) {
if ((sym->type==LABSYM || sym->type==EXPRESSION) &&
!(sym->flags & VASMINTERN) && (sym->flags & EXPORT)) {
gst_xdef(f,sym->name,get_sym_value(sym),
(sym->type==LABSYM&&sym->sec!=NULL)?-(int)sym->sec->idx:0);
}
}
}
static void write_output(FILE *f,section *sec,symbol *sym)
{
gst_source(f,filename);
define_import_names(f,sym,define_section_names(f,sec));
for (; sec; sec=sec->next)
stream_section(f,sec);
common_symbols(f,sym);
export_symbols(f,sym);
GSTOUT(f,GST_END);
}
static int output_args(char *p)
{
return 0;
}
int init_output_gst(char **cp,void (**wo)(FILE *,section *,symbol *),
int (**oa)(char *))
{
if (bitsperbyte != 8) {
output_error(1, cpuname); /* output module doesn't support (cpuname) */
return 0;
}
*cp = copyright;
*wo = write_output;
*oa = output_args;
return 1;
}
#else
int init_output_gst(char **cp,void (**wo)(FILE *,section *,symbol *),
int (**oa)(char *))
{
return 0;
}
#endif