ref: f88a55e79b5bf656e7f9578d1318a955b9a4963a
dir: /sys/src/cmd/7l/asm.c/
#include "l.h"
long OFFSET;
#define PADDR(a) ((a) & ~0xfffffffff0000000ull)
vlong
entryvalue(void)
{
char *a;
Sym *s;
a = INITENTRY;
if(*a >= '0' && *a <= '9')
return atolwhex(a);
s = lookup(a, 0);
if(s->type == 0)
return INITTEXT;
switch(s->type) {
case STEXT:
case SLEAF:
break;
case SDATA:
if(dlm)
return s->value+INITDAT;
default:
diag("entry not text: %s", s->name);
}
return s->value;
}
void
cflush(void)
{
int n;
n = sizeof(buf.cbuf) - cbc;
if(n)
write(cout, buf.cbuf, n);
cbp = buf.cbuf;
cbc = sizeof(buf.cbuf);
}
void
asmb(void)
{
Prog *p;
long magic;
vlong vl, etext;
Optab *o;
uchar *sbuf, *dbuf;
if(debug['v'])
Bprint(&bso, "%5.2f asm\n", cputime());
Bflush(&bso);
OFFSET = HEADR;
seek(cout, OFFSET, 0);
pc = INITTEXT;
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT) {
curtext = p;
autosize = p->to.offset + PCSZ;
}else if(p->as == ADWORD && (pc & 7) != 0) {
lputl(0);
pc += 4;
}
if(p->pc != pc) {
diag("phase error %llux sb %llux",
p->pc, pc);
if(!debug['a'])
prasm(curp);
pc = p->pc;
}
curp = p;
o = oplook(p); /* could probably avoid this call */
asmout(p, o);
pc += o->size;
}
if(debug['a'])
Bprint(&bso, "\n");
Bflush(&bso);
cflush();
/* output strings in text segment */
etext = INITTEXT + textsize;
sbuf = calloc(1, etext-pc);
dbuf = calloc(1, datsize);
datfill(sbuf, pc, dbuf, 0);
write(cout, sbuf, etext-pc);
free(sbuf);
curtext = P;
switch(HEADTYPE) {
case 0:
case 2:
case 7:
OFFSET = HEADR+textsize;
seek(cout, OFFSET, 0);
break;
case 6: /* no header, padded segments */
OFFSET = rnd(HEADR+textsize, INITRND);
seek(cout, OFFSET, 0);
break;
}
if(dlm){
char buf[8];
write(cout, buf, INITDAT-textsize);
textsize = INITDAT;
}
write(cout, dbuf, datsize);
free(dbuf);
symsize = 0;
lcsize = 0;
if(!debug['s']) {
if(debug['v'])
Bprint(&bso, "%5.2f sym\n", cputime());
Bflush(&bso);
switch(HEADTYPE) {
case 0:
debug['s'] = 1;
break;
case 2:
OFFSET = HEADR+textsize+datsize;
seek(cout, OFFSET, 0);
break;
case 6: /* no header, padded segments */
OFFSET += rnd(datsize, INITRND);
seek(cout, OFFSET, 0);
break;
case 7:
break;
}
if(!debug['s'])
asmsym();
if(debug['v'])
Bprint(&bso, "%5.2f pc\n", cputime());
Bflush(&bso);
if(!debug['s'])
asmlc();
if(dlm)
asmdyn();
cflush();
}
else if(dlm){
seek(cout, HEADR+textsize+datsize, 0);
asmdyn();
cflush();
}
if(debug['v'])
Bprint(&bso, "%5.2f header\n", cputime());
Bflush(&bso);
OFFSET = 0;
seek(cout, OFFSET, 0);
switch(HEADTYPE) {
case 0: /* no header */
case 6: /* no header, padded segments */
break;
case 2: /* plan 9 */
magic = 4*28*28+7;
magic |= 0x00008000; /* fat header */
if(dlm)
magic |= 0x80000000; /* dlm */
lput(magic); /* magic */
lput(textsize); /* sizes */
lput(datsize);
lput(bsssize);
lput(symsize); /* nsyms */
vl = entryvalue();
lput(PADDR(vl)); /* va of entry */
lput(0L);
lput(lcsize);
llput(vl); /* va of entry */
break;
}
cflush();
}
void
cput(int c)
{
cbp[0] = c;
cbp++;
cbc--;
if(cbc <= 0)
cflush();
}
void
wput(long l)
{
cbp[0] = l>>8;
cbp[1] = l;
cbp += 2;
cbc -= 2;
if(cbc <= 0)
cflush();
}
void
wputl(long l)
{
cbp[0] = l;
cbp[1] = l>>8;
cbp += 2;
cbc -= 2;
if(cbc <= 0)
cflush();
}
void
lput(long l)
{
cbp[0] = l>>24;
cbp[1] = l>>16;
cbp[2] = l>>8;
cbp[3] = l;
cbp += 4;
cbc -= 4;
if(cbc <= 0)
cflush();
}
void
lputl(long l)
{
cbp[3] = l>>24;
cbp[2] = l>>16;
cbp[1] = l>>8;
cbp[0] = l;
cbp += 4;
cbc -= 4;
if(cbc <= 0)
cflush();
}
void
llput(vlong v)
{
lput(v>>32);
lput(v);
}
void
llputl(vlong v)
{
lputl(v);
lputl(v>>32);
}
void
asmsym(void)
{
Prog *p;
Auto *a;
Sym *s;
int h;
s = lookup("etext", 0);
if(s->type == STEXT)
putsymb(s->name, 'T', s->value, s->version);
for(h=0; h<NHASH; h++)
for(s=hash[h]; s!=S; s=s->link)
switch(s->type) {
case SCONST:
putsymb(s->name, 'D', s->value, s->version);
continue;
case SDATA:
putsymb(s->name, 'D', s->value+INITDAT, s->version);
continue;
case SBSS:
putsymb(s->name, 'B', s->value+INITDAT, s->version);
continue;
case SSTRING:
putsymb(s->name, 'T', s->value, s->version);
continue;
case SFILE:
putsymb(s->name, 'f', s->value, s->version);
continue;
}
for(p=textp; p!=P; p=p->cond) {
s = p->from.sym;
if(s->type != STEXT && s->type != SLEAF)
continue;
/* filenames first */
for(a=p->to.autom; a; a=a->link)
if(a->type == D_FILE)
putsymb(a->asym->name, 'z', a->aoffset, 0);
else
if(a->type == D_FILE1)
putsymb(a->asym->name, 'Z', a->aoffset, 0);
if(s->type == STEXT)
putsymb(s->name, 'T', s->value, s->version);
else
putsymb(s->name, 'L', s->value, s->version);
/* frame, auto and param after */
putsymb(".frame", 'm', p->to.offset+PCSZ, 0);
for(a=p->to.autom; a; a=a->link)
if(a->type == D_AUTO)
putsymb(a->asym->name, 'a', -a->aoffset, 0);
else
if(a->type == D_PARAM)
putsymb(a->asym->name, 'p', a->aoffset, 0);
}
if(debug['v'] || debug['n'])
Bprint(&bso, "symsize = %lud\n", symsize);
Bflush(&bso);
}
void
putsymb(char *s, int t, vlong v, int ver)
{
int i, f, l;
if(t == 'f')
s++;
l = 4;
switch(HEADTYPE){
default:
break;
case 2:
lput(v>>32);
l = 8;
break;
}
lput(v);
if(ver)
t += 'a' - 'A';
cput(t+0x80); /* 0x80 is variable length */
if(t == 'Z' || t == 'z') {
cput(s[0]);
for(i=1; s[i] != 0 || s[i+1] != 0; i += 2) {
cput(s[i]);
cput(s[i+1]);
}
cput(0);
cput(0);
i++;
}
else {
for(i=0; s[i]; i++)
cput(s[i]);
cput(0);
}
symsize += l + 1 + i + 1;
if(debug['n']) {
if(t == 'z' || t == 'Z') {
Bprint(&bso, "%c %.8llux ", t, v);
for(i=1; s[i] != 0 || s[i+1] != 0; i+=2) {
f = ((s[i]&0xff) << 8) | (s[i+1]&0xff);
Bprint(&bso, "/%x", f);
}
Bprint(&bso, "\n");
return;
}
if(ver)
Bprint(&bso, "%c %.8llux %s<%d>\n", t, v, s, ver);
else
Bprint(&bso, "%c %.8llux %s\n", t, v, s);
}
}
#define MINLC 4
void
asmlc(void)
{
vlong oldpc;
Prog *p;
long v, s, oldlc;
oldpc = INITTEXT;
oldlc = 0;
for(p = firstp; p != P; p = p->link) {
if(p->line == oldlc || p->as == ATEXT || p->as == ANOP) {
if(p->as == ATEXT)
curtext = p;
if(debug['V'])
Bprint(&bso, "%6llux %P\n",
p->pc, p);
continue;
}
if(debug['V'])
Bprint(&bso, "\t\t%6ld", lcsize);
v = (p->pc - oldpc) / MINLC;
while(v) {
s = 127;
if(v < 127)
s = v;
cput(s+128); /* 129-255 +pc */
if(debug['V'])
Bprint(&bso, " pc+%ld*%d(%ld)", s, MINLC, s+128);
v -= s;
lcsize++;
}
s = p->line - oldlc;
oldlc = p->line;
oldpc = p->pc + MINLC;
if(s > 64 || s < -64) {
cput(0); /* 0 vv +lc */
cput(s>>24);
cput(s>>16);
cput(s>>8);
cput(s);
if(debug['V']) {
if(s > 0)
Bprint(&bso, " lc+%ld(%d,%ld)\n",
s, 0, s);
else
Bprint(&bso, " lc%ld(%d,%ld)\n",
s, 0, s);
Bprint(&bso, "%6llux %P\n",
p->pc, p);
}
lcsize += 5;
continue;
}
if(s > 0) {
cput(0+s); /* 1-64 +lc */
if(debug['V']) {
Bprint(&bso, " lc+%ld(%ld)\n", s, 0+s);
Bprint(&bso, "%6llux %P\n",
p->pc, p);
}
} else {
cput(64-s); /* 65-128 -lc */
if(debug['V']) {
Bprint(&bso, " lc%ld(%ld)\n", s, 64-s);
Bprint(&bso, "%6llux %P\n",
p->pc, p);
}
}
lcsize++;
}
while(lcsize & 1) {
s = 129;
cput(s);
lcsize++;
}
if(debug['v'] || debug['V'])
Bprint(&bso, "lcsize = %ld\n", lcsize);
Bflush(&bso);
}
void
datfill(uchar *sbuf, long soff, uchar *dbuf, long doff)
{
Sym *v;
Prog *p;
uchar *cast, *b, *nuxi;
long a, l, fl, j;
vlong d;
int i, c;
for(p = datap; p != P; p = p->link) {
curp = p;
a = p->from.sym->value + p->from.offset;
l = a;
if(p->from.sym->type == SSTRING){
b = sbuf;
l -= soff;
}else{
b = dbuf;
l -= doff;
}
c = p->reg;
i = 0;
if(p->as != AINIT && p->as != ADYNT && !p->from.sym->dupok) {
for(j=l+(c-i)-1; j>=l; j--)
if(b[j]) {
print("%P\n", p);
diag("multiple initialization");
break;
}
}
cast = nuxi = nil;
switch(p->to.type) {
default:
diag("unknown mode in initialization%P", p);
break;
case D_SCONST:
while(i < c)
b[l++] = p->to.sval[i++];
break;
case D_FCONST:
switch(c) {
default:
case 4:
fl = ieeedtof(p->to.ieee);
cast = (uchar*)&fl;
nuxi = fnuxi4;
break;
case 8:
cast = (uchar*)p->to.ieee;
nuxi = fnuxi8;
break;
}
break;
case D_CONST:
d = p->to.offset;
v = p->to.sym;
if(v) {
switch(v->type) {
case SUNDEF:
ckoff(v, d);
case STEXT:
case SLEAF:
case SSTRING:
d += p->to.sym->value;
break;
case SDATA:
case SBSS:
d += p->to.sym->value + INITDAT;
}
if(dlm)
dynreloc(v, a+INITDAT, 1);
}
cast = (uchar*)&d;
nuxi = inuxi[c];
break;
}
if(cast)
while(i < c)
b[l++] = cast[nuxi[i++]];
}
}
int
chipfloat(Ieee *e)
{
int n, Bbbbbbbbb;
if(e->l != 0 || (e->h & 0xffffU) != 0)
return -1;
n = e->h >> 16;
Bbbbbbbbb = (n>>6) & 0x1ff;
if(Bbbbbbbbb != 0x100 && Bbbbbbbbb != 0xff)
return -1;
n = (n & 0x8000) >> 8 | (n & 0x7f);
return n;
}