ref: a411870ee4640241e3c494367d922847da84f972
dir: /utils/8l/span.c/
#include "l.h"
void
span(void)
{
Prog *p, *q;
long v, c, idat;
int m, n, again;
xdefine("etext", STEXT, 0L);
idat = INITDAT;
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT)
curtext = p;
n = 0;
if(p->to.type == D_BRANCH)
if(p->pcond == P)
p->pcond = p;
if((q = p->pcond) != P)
if(q->back != 2)
n = 1;
p->back = n;
if(p->as == AADJSP) {
p->to.type = D_SP;
v = -p->from.offset;
p->from.offset = v;
p->as = AADDL;
if(v < 0) {
p->as = ASUBL;
v = -v;
p->from.offset = v;
}
if(v == 0)
p->as = ANOP;
}
}
n = 0;
start:
if(debug['v'])
Bprint(&bso, "%5.2f span\n", cputime());
Bflush(&bso);
c = INITTEXT;
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT)
curtext = p;
if(p->to.type == D_BRANCH)
if(p->back)
p->pc = c;
asmins(p);
p->pc = c;
m = andptr-and;
p->mark = m;
c += m;
}
loop:
n++;
if(debug['v'])
Bprint(&bso, "%5.2f span %d\n", cputime(), n);
Bflush(&bso);
if(n > 50) {
print("span must be looping\n");
errorexit();
}
again = 0;
c = INITTEXT;
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT)
curtext = p;
if(p->to.type == D_BRANCH) {
if(p->back)
p->pc = c;
asmins(p);
m = andptr-and;
if(m != p->mark) {
p->mark = m;
again++;
}
}
p->pc = c;
c += p->mark;
}
if(again) {
textsize = c;
goto loop;
}
if(INITRND) {
INITDAT = rnd(c, INITRND);
if(INITDAT != idat) {
idat = INITDAT;
goto start;
}
}
xdefine("etext", STEXT, c);
if(debug['v'])
Bprint(&bso, "etext = %lux\n", c);
Bflush(&bso);
for(p = textp; p != P; p = p->pcond)
p->from.sym->value = p->pc;
textsize = c - INITTEXT;
}
void
xdefine(char *p, int t, long v)
{
Sym *s;
s = lookup(p, 0);
if(s->type == 0 || s->type == SXREF) {
s->type = t;
s->value = v;
}
if(s->type == STEXT && s->value == 0)
s->value = v;
}
void
putsymb(char *s, int t, long v, int ver)
{
int i, f;
if(t == 'f')
s++;
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 += 4 + 1 + i + 1;
if(debug['n']) {
if(t == 'z' || t == 'Z') {
Bprint(&bso, "%c %.8lux ", 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 %.8lux %s<%d>\n", t, v, s, ver);
else
Bprint(&bso, "%c %.8lux %s\n", t, v, s);
}
}
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 SFILE:
putsymb(s->name, 'f', s->value, s->version);
continue;
}
for(p=textp; p!=P; p=p->pcond) {
s = p->from.sym;
if(s->type != STEXT)
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);
putsymb(s->name, 'T', s->value, s->version);
/* frame, auto and param after */
putsymb(".frame", 'm', p->to.offset+4, 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
asmlc(void)
{
long oldpc, oldlc;
Prog *p;
long v, s;
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, "%6lux %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, "%6lux %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, "%6lux %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, "%6lux %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);
}
int
prefixof(Adr *a)
{
switch(a->type) {
case D_INDIR+D_CS:
return 0x2e;
case D_INDIR+D_DS:
return 0x3e;
case D_INDIR+D_ES:
return 0x26;
case D_INDIR+D_FS:
return 0x64;
case D_INDIR+D_GS:
return 0x65;
}
return 0;
}
int
oclass(Adr *a)
{
long v;
if(a->type >= D_INDIR || a->index != D_NONE) {
if(a->index != D_NONE && a->scale == 0) {
if(a->type == D_ADDR) {
switch(a->index) {
case D_EXTERN:
case D_STATIC:
return Yi32;
case D_AUTO:
case D_PARAM:
return Yiauto;
}
return Yxxx;
}
return Ycol;
}
return Ym;
}
switch(a->type)
{
case D_AL:
return Yal;
case D_AX:
return Yax;
case D_CL:
return Ycl;
case D_DL:
case D_BL:
case D_AH:
case D_CH:
case D_DH:
case D_BH:
return Yrb;
case D_CX:
return Ycx;
case D_DX:
case D_BX:
return Yrx;
case D_SP:
case D_BP:
case D_SI:
case D_DI:
return Yrl;
case D_F0+0:
return Yf0;
case D_F0+1:
case D_F0+2:
case D_F0+3:
case D_F0+4:
case D_F0+5:
case D_F0+6:
case D_F0+7:
return Yrf;
case D_NONE:
return Ynone;
case D_CS: return Ycs;
case D_SS: return Yss;
case D_DS: return Yds;
case D_ES: return Yes;
case D_FS: return Yfs;
case D_GS: return Ygs;
case D_GDTR: return Ygdtr;
case D_IDTR: return Yidtr;
case D_LDTR: return Yldtr;
case D_MSW: return Ymsw;
case D_TASK: return Ytask;
case D_CR+0: return Ycr0;
case D_CR+1: return Ycr1;
case D_CR+2: return Ycr2;
case D_CR+3: return Ycr3;
case D_CR+4: return Ycr4;
case D_CR+5: return Ycr5;
case D_CR+6: return Ycr6;
case D_CR+7: return Ycr7;
case D_DR+0: return Ydr0;
case D_DR+1: return Ydr1;
case D_DR+2: return Ydr2;
case D_DR+3: return Ydr3;
case D_DR+4: return Ydr4;
case D_DR+5: return Ydr5;
case D_DR+6: return Ydr6;
case D_DR+7: return Ydr7;
case D_TR+0: return Ytr0;
case D_TR+1: return Ytr1;
case D_TR+2: return Ytr2;
case D_TR+3: return Ytr3;
case D_TR+4: return Ytr4;
case D_TR+5: return Ytr5;
case D_TR+6: return Ytr6;
case D_TR+7: return Ytr7;
case D_EXTERN:
case D_STATIC:
case D_AUTO:
case D_PARAM:
return Ym;
case D_CONST:
case D_ADDR:
if(a->sym == S) {
v = a->offset;
if(v == 0)
return Yi0;
if(v == 1)
return Yi1;
if(v >= -128 && v <= 127)
return Yi8;
}
return Yi32;
case D_BRANCH:
return Ybr;
}
return Yxxx;
}
void
asmidx(Adr *a, int base)
{
int i;
switch(a->index) {
default:
goto bad;
case D_NONE:
i = 4 << 3;
goto bas;
case D_AX:
case D_CX:
case D_DX:
case D_BX:
case D_BP:
case D_SI:
case D_DI:
i = reg[a->index] << 3;
break;
}
switch(a->scale) {
default:
goto bad;
case 1:
break;
case 2:
i |= (1<<6);
break;
case 4:
i |= (2<<6);
break;
case 8:
i |= (3<<6);
break;
}
bas:
switch(base) {
default:
goto bad;
case D_NONE: /* must be mod=00 */
i |= 5;
break;
case D_AX:
case D_CX:
case D_DX:
case D_BX:
case D_SP:
case D_BP:
case D_SI:
case D_DI:
i |= reg[base];
break;
}
*andptr++ = i;
return;
bad:
diag("asmidx: bad address %D", a);
*andptr++ = 0;
return;
}
static void
put4(long v)
{
if(dlm && curp != P && reloca != nil){
dynreloc(reloca->sym, curp->pc + andptr - &and[0], 1);
reloca = nil;
}
andptr[0] = v;
andptr[1] = v>>8;
andptr[2] = v>>16;
andptr[3] = v>>24;
andptr += 4;
}
long
vaddr(Adr *a)
{
int t;
long v;
Sym *s;
t = a->type;
v = a->offset;
if(t == D_ADDR)
t = a->index;
switch(t) {
case D_STATIC:
case D_EXTERN:
s = a->sym;
if(s != nil) {
if(dlm && curp != P)
reloca = a;
switch(s->type) {
case SUNDEF:
ckoff(s, v);
case STEXT:
case SCONST:
v += s->value;
break;
default:
v += INITDAT + s->value;
}
}
}
return v;
}
void
asmand(Adr *a, int r)
{
long v;
int t;
Adr aa;
v = a->offset;
t = a->type;
if(a->index != D_NONE) {
if(t >= D_INDIR) {
t -= D_INDIR;
if(t == D_NONE) {
*andptr++ = (0 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
put4(v);
return;
}
if(v == 0 && t != D_BP) {
*andptr++ = (0 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
return;
}
if(v >= -128 && v < 128) {
*andptr++ = (1 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
*andptr++ = v;
return;
}
*andptr++ = (2 << 6) | (4 << 0) | (r << 3);
asmidx(a, t);
put4(v);
return;
}
switch(t) {
default:
goto bad;
case D_STATIC:
case D_EXTERN:
aa.type = D_NONE+D_INDIR;
break;
case D_AUTO:
case D_PARAM:
aa.type = D_SP+D_INDIR;
break;
}
aa.offset = vaddr(a);
aa.index = a->index;
aa.scale = a->scale;
asmand(&aa, r);
return;
}
if(t >= D_AL && t <= D_F0+7) {
if(v)
goto bad;
*andptr++ = (3 << 6) | (reg[t] << 0) | (r << 3);
return;
}
if(t >= D_INDIR) {
t -= D_INDIR;
if(t == D_NONE || D_CS <= t && t <= D_GS) {
*andptr++ = (0 << 6) | (5 << 0) | (r << 3);
put4(v);
return;
}
if(t == D_SP) {
if(v == 0) {
*andptr++ = (0 << 6) | (4 << 0) | (r << 3);
asmidx(a, D_SP);
return;
}
if(v >= -128 && v < 128) {
*andptr++ = (1 << 6) | (4 << 0) | (r << 3);
asmidx(a, D_SP);
*andptr++ = v;
return;
}
*andptr++ = (2 << 6) | (4 << 0) | (r << 3);
asmidx(a, D_SP);
put4(v);
return;
}
if(t >= D_AX && t <= D_DI) {
if(v == 0 && t != D_BP) {
*andptr++ = (0 << 6) | (reg[t] << 0) | (r << 3);
return;
}
if(v >= -128 && v < 128) {
andptr[0] = (1 << 6) | (reg[t] << 0) | (r << 3);
andptr[1] = v;
andptr += 2;
return;
}
*andptr++ = (2 << 6) | (reg[t] << 0) | (r << 3);
put4(v);
return;
}
goto bad;
}
switch(a->type) {
default:
goto bad;
case D_STATIC:
case D_EXTERN:
aa.type = D_NONE+D_INDIR;
break;
case D_AUTO:
case D_PARAM:
aa.type = D_SP+D_INDIR;
break;
}
aa.index = D_NONE;
aa.scale = 1;
aa.offset = vaddr(a);
asmand(&aa, r);
return;
bad:
diag("asmand: bad address %D", a);
return;
}
#define E 0xff
uchar ymovtab[] =
{
/* push */
APUSHL, Ycs, Ynone, 0, 0x0e,E,0,0,
APUSHL, Yss, Ynone, 0, 0x16,E,0,0,
APUSHL, Yds, Ynone, 0, 0x1e,E,0,0,
APUSHL, Yes, Ynone, 0, 0x06,E,0,0,
APUSHL, Yfs, Ynone, 0, 0x0f,0xa0,E,0,
APUSHL, Ygs, Ynone, 0, 0x0f,0xa8,E,0,
APUSHW, Ycs, Ynone, 0, Pe,0x0e,E,0,
APUSHW, Yss, Ynone, 0, Pe,0x16,E,0,
APUSHW, Yds, Ynone, 0, Pe,0x1e,E,0,
APUSHW, Yes, Ynone, 0, Pe,0x06,E,0,
APUSHW, Yfs, Ynone, 0, Pe,0x0f,0xa0,E,
APUSHW, Ygs, Ynone, 0, Pe,0x0f,0xa8,E,
/* pop */
APOPL, Ynone, Yds, 0, 0x1f,E,0,0,
APOPL, Ynone, Yes, 0, 0x07,E,0,0,
APOPL, Ynone, Yss, 0, 0x17,E,0,0,
APOPL, Ynone, Yfs, 0, 0x0f,0xa1,E,0,
APOPL, Ynone, Ygs, 0, 0x0f,0xa9,E,0,
APOPW, Ynone, Yds, 0, Pe,0x1f,E,0,
APOPW, Ynone, Yes, 0, Pe,0x07,E,0,
APOPW, Ynone, Yss, 0, Pe,0x17,E,0,
APOPW, Ynone, Yfs, 0, Pe,0x0f,0xa1,E,
APOPW, Ynone, Ygs, 0, Pe,0x0f,0xa9,E,
/* mov seg */
AMOVW, Yes, Yml, 1, 0x8c,0,0,0,
AMOVW, Ycs, Yml, 1, 0x8c,1,0,0,
AMOVW, Yss, Yml, 1, 0x8c,2,0,0,
AMOVW, Yds, Yml, 1, 0x8c,3,0,0,
AMOVW, Yfs, Yml, 1, 0x8c,4,0,0,
AMOVW, Ygs, Yml, 1, 0x8c,5,0,0,
AMOVW, Yml, Yes, 2, 0x8e,0,0,0,
AMOVW, Yml, Ycs, 2, 0x8e,1,0,0,
AMOVW, Yml, Yss, 2, 0x8e,2,0,0,
AMOVW, Yml, Yds, 2, 0x8e,3,0,0,
AMOVW, Yml, Yfs, 2, 0x8e,4,0,0,
AMOVW, Yml, Ygs, 2, 0x8e,5,0,0,
/* mov cr */
AMOVL, Ycr0, Yml, 3, 0x0f,0x20,0,0,
AMOVL, Ycr2, Yml, 3, 0x0f,0x20,2,0,
AMOVL, Ycr3, Yml, 3, 0x0f,0x20,3,0,
AMOVL, Ycr4, Yml, 3, 0x0f,0x20,4,0,
AMOVL, Yml, Ycr0, 4, 0x0f,0x22,0,0,
AMOVL, Yml, Ycr2, 4, 0x0f,0x22,2,0,
AMOVL, Yml, Ycr3, 4, 0x0f,0x22,3,0,
AMOVL, Yml, Ycr4, 4, 0x0f,0x22,4,0,
/* mov dr */
AMOVL, Ydr0, Yml, 3, 0x0f,0x21,0,0,
AMOVL, Ydr6, Yml, 3, 0x0f,0x21,6,0,
AMOVL, Ydr7, Yml, 3, 0x0f,0x21,7,0,
AMOVL, Yml, Ydr0, 4, 0x0f,0x23,0,0,
AMOVL, Yml, Ydr6, 4, 0x0f,0x23,6,0,
AMOVL, Yml, Ydr7, 4, 0x0f,0x23,7,0,
/* mov tr */
AMOVL, Ytr6, Yml, 3, 0x0f,0x24,6,0,
AMOVL, Ytr7, Yml, 3, 0x0f,0x24,7,0,
AMOVL, Yml, Ytr6, 4, 0x0f,0x26,6,E,
AMOVL, Yml, Ytr7, 4, 0x0f,0x26,7,E,
/* lgdt, sgdt, lidt, sidt */
AMOVL, Ym, Ygdtr, 4, 0x0f,0x01,2,0,
AMOVL, Ygdtr, Ym, 3, 0x0f,0x01,0,0,
AMOVL, Ym, Yidtr, 4, 0x0f,0x01,3,0,
AMOVL, Yidtr, Ym, 3, 0x0f,0x01,1,0,
/* lldt, sldt */
AMOVW, Yml, Yldtr, 4, 0x0f,0x00,2,0,
AMOVW, Yldtr, Yml, 3, 0x0f,0x00,0,0,
/* lmsw, smsw */
AMOVW, Yml, Ymsw, 4, 0x0f,0x01,6,0,
AMOVW, Ymsw, Yml, 3, 0x0f,0x01,4,0,
/* ltr, str */
AMOVW, Yml, Ytask, 4, 0x0f,0x00,3,0,
AMOVW, Ytask, Yml, 3, 0x0f,0x00,1,0,
/* load full pointer */
AMOVL, Yml, Ycol, 5, 0,0,0,0,
AMOVW, Yml, Ycol, 5, Pe,0,0,0,
/* double shift */
ASHLL, Ycol, Yml, 6, 0xa4,0xa5,0,0,
ASHRL, Ycol, Yml, 6, 0xac,0xad,0,0,
/* extra imul */
AIMULW, Yml, Yrl, 7, Pq,0xaf,0,0,
AIMULL, Yml, Yrl, 7, Pm,0xaf,0,0,
0
};
int
isax(Adr *a)
{
switch(a->type) {
case D_AX:
case D_AL:
case D_AH:
case D_INDIR+D_AX:
return 1;
}
if(a->index == D_AX)
return 1;
return 0;
}
void
subreg(Prog *p, int from, int to)
{
if(debug['Q'])
print("\n%P s/%R/%R/\n", p, from, to);
if(p->from.type == from)
p->from.type = to;
if(p->to.type == from)
p->to.type = to;
if(p->from.index == from)
p->from.index = to;
if(p->to.index == from)
p->to.index = to;
from += D_INDIR;
if(p->from.type == from)
p->from.type = to+D_INDIR;
if(p->to.type == from)
p->to.type = to+D_INDIR;
if(debug['Q'])
print("%P\n", p);
}
void
doasm(Prog *p)
{
Optab *o;
Prog *q, pp;
uchar *t;
int z, op, ft, tt;
long v, pre;
pre = prefixof(&p->from);
if(pre)
*andptr++ = pre;
pre = prefixof(&p->to);
if(pre)
*andptr++ = pre;
o = &optab[p->as];
ft = oclass(&p->from) * Ymax;
tt = oclass(&p->to) * Ymax;
t = o->ytab;
if(t == 0) {
diag("asmins: noproto %P", p);
return;
}
for(z=0; *t; z+=t[3],t+=4)
if(ycover[ft+t[0]])
if(ycover[tt+t[1]])
goto found;
goto domov;
found:
switch(o->prefix) {
case Pq: /* 16 bit escape and opcode escape */
*andptr++ = Pe;
*andptr++ = Pm;
break;
case Pm: /* opcode escape */
*andptr++ = Pm;
break;
case Pe: /* 16 bit escape */
*andptr++ = Pe;
break;
case Pb: /* botch */
break;
}
v = vaddr(&p->from);
op = o->op[z];
switch(t[2]) {
default:
diag("asmins: unknown z %d %P", t[2], p);
return;
case Zpseudo:
break;
case Zlit:
for(; op = o->op[z]; z++)
*andptr++ = op;
break;
case Zm_r:
*andptr++ = op;
asmand(&p->from, reg[p->to.type]);
break;
case Zaut_r:
*andptr++ = 0x8d; /* leal */
if(p->from.type != D_ADDR)
diag("asmins: Zaut sb type ADDR");
p->from.type = p->from.index;
p->from.index = D_NONE;
asmand(&p->from, reg[p->to.type]);
p->from.index = p->from.type;
p->from.type = D_ADDR;
break;
case Zm_o:
*andptr++ = op;
asmand(&p->from, o->op[z+1]);
break;
case Zr_m:
*andptr++ = op;
asmand(&p->to, reg[p->from.type]);
break;
case Zo_m:
*andptr++ = op;
asmand(&p->to, o->op[z+1]);
break;
case Zm_ibo:
v = vaddr(&p->to);
*andptr++ = op;
asmand(&p->from, o->op[z+1]);
*andptr++ = v;
break;
case Zibo_m:
*andptr++ = op;
asmand(&p->to, o->op[z+1]);
*andptr++ = v;
break;
case Z_ib:
v = vaddr(&p->to);
case Zib_:
*andptr++ = op;
*andptr++ = v;
break;
case Zib_rp:
*andptr++ = op + reg[p->to.type];
*andptr++ = v;
break;
case Zil_rp:
*andptr++ = op + reg[p->to.type];
if(o->prefix == Pe) {
*andptr++ = v;
*andptr++ = v>>8;
}
else
put4(v);
break;
case Zib_rr:
*andptr++ = op;
asmand(&p->to, reg[p->to.type]);
*andptr++ = v;
break;
case Z_il:
v = vaddr(&p->to);
case Zil_:
*andptr++ = op;
if(o->prefix == Pe) {
*andptr++ = v;
*andptr++ = v>>8;
}
else
put4(v);
break;
case Zm_ilo:
v = vaddr(&p->to);
*andptr++ = op;
asmand(&p->from, o->op[z+1]);
if(o->prefix == Pe) {
*andptr++ = v;
*andptr++ = v>>8;
}
else
put4(v);
break;
case Zilo_m:
*andptr++ = op;
asmand(&p->to, o->op[z+1]);
if(o->prefix == Pe) {
*andptr++ = v;
*andptr++ = v>>8;
}
else
put4(v);
break;
case Zil_rr:
*andptr++ = op;
asmand(&p->to, reg[p->to.type]);
if(o->prefix == Pe) {
*andptr++ = v;
*andptr++ = v>>8;
}
else
put4(v);
break;
case Z_rp:
*andptr++ = op + reg[p->to.type];
break;
case Zrp_:
*andptr++ = op + reg[p->from.type];
break;
case Zclr:
*andptr++ = op;
asmand(&p->to, reg[p->to.type]);
break;
case Zbr:
q = p->pcond;
if(q) {
v = q->pc - p->pc - 2;
if(v >= -128 && v <= 127) {
*andptr++ = op;
*andptr++ = v;
} else {
v -= 6-2;
*andptr++ = 0x0f;
*andptr++ = o->op[z+1];
*andptr++ = v;
*andptr++ = v>>8;
*andptr++ = v>>16;
*andptr++ = v>>24;
}
}
break;
case Zcall:
q = p->pcond;
if(q) {
v = q->pc - p->pc - 5;
if(dlm && curp != P && p->to.sym->type == SUNDEF){
/* v = 0 - p->pc - 5; */
v = 0;
ckoff(p->to.sym, v);
v += p->to.sym->value;
dynreloc(p->to.sym, p->pc+1, 0);
}
*andptr++ = op;
*andptr++ = v;
*andptr++ = v>>8;
*andptr++ = v>>16;
*andptr++ = v>>24;
}
break;
case Zjmp:
q = p->pcond;
if(q) {
v = q->pc - p->pc - 2;
if(v >= -128 && v <= 127) {
*andptr++ = op;
*andptr++ = v;
} else {
v -= 5-2;
*andptr++ = o->op[z+1];
*andptr++ = v;
*andptr++ = v>>8;
*andptr++ = v>>16;
*andptr++ = v>>24;
}
}
break;
case Zloop:
q = p->pcond;
if(q) {
v = q->pc - p->pc - 2;
if(v < -128 || v > 127)
diag("loop too far: %P", p);
*andptr++ = op;
*andptr++ = v;
}
break;
case Zbyte:
*andptr++ = v;
if(op > 1) {
*andptr++ = v>>8;
if(op > 2) {
*andptr++ = v>>16;
*andptr++ = v>>24;
}
}
break;
case Zmov:
goto domov;
}
return;
domov:
for(t=ymovtab; *t; t+=8)
if(p->as == t[0])
if(ycover[ft+t[1]])
if(ycover[tt+t[2]])
goto mfound;
bad:
/*
* here, the assembly has failed.
* if its a byte instruction that has
* unaddressable registers, try to
* exchange registers and reissue the
* instruction with the operands renamed.
*/
pp = *p;
z = p->from.type;
if(z >= D_BP && z <= D_DI) {
if(isax(&p->to)) {
*andptr++ = 0x87; /* xchg lhs,bx */
asmand(&p->from, reg[D_BX]);
subreg(&pp, z, D_BX);
doasm(&pp);
*andptr++ = 0x87; /* xchg lhs,bx */
asmand(&p->from, reg[D_BX]);
} else {
*andptr++ = 0x90 + reg[z]; /* xchg lsh,ax */
subreg(&pp, z, D_AX);
doasm(&pp);
*andptr++ = 0x90 + reg[z]; /* xchg lsh,ax */
}
return;
}
z = p->to.type;
if(z >= D_BP && z <= D_DI) {
if(isax(&p->from)) {
*andptr++ = 0x87; /* xchg rhs,bx */
asmand(&p->to, reg[D_BX]);
subreg(&pp, z, D_BX);
doasm(&pp);
*andptr++ = 0x87; /* xchg rhs,bx */
asmand(&p->to, reg[D_BX]);
} else {
*andptr++ = 0x90 + reg[z]; /* xchg rsh,ax */
subreg(&pp, z, D_AX);
doasm(&pp);
*andptr++ = 0x90 + reg[z]; /* xchg rsh,ax */
}
return;
}
diag("doasm: notfound t2=%ux from=%ux to=%ux %P", t[2], p->from.type, p->to.type, p);
return;
mfound:
switch(t[3]) {
default:
diag("asmins: unknown mov %d %P", t[3], p);
break;
case 0: /* lit */
for(z=4; t[z]!=E; z++)
*andptr++ = t[z];
break;
case 1: /* r,m */
*andptr++ = t[4];
asmand(&p->to, t[5]);
break;
case 2: /* m,r */
*andptr++ = t[4];
asmand(&p->from, t[5]);
break;
case 3: /* r,m - 2op */
*andptr++ = t[4];
*andptr++ = t[5];
asmand(&p->to, t[6]);
break;
case 4: /* m,r - 2op */
*andptr++ = t[4];
*andptr++ = t[5];
asmand(&p->from, t[6]);
break;
case 5: /* load full pointer, trash heap */
if(t[4])
*andptr++ = t[4];
switch(p->to.index) {
default:
goto bad;
case D_DS:
*andptr++ = 0xc5;
break;
case D_SS:
*andptr++ = 0x0f;
*andptr++ = 0xb2;
break;
case D_ES:
*andptr++ = 0xc4;
break;
case D_FS:
*andptr++ = 0x0f;
*andptr++ = 0xb4;
break;
case D_GS:
*andptr++ = 0x0f;
*andptr++ = 0xb5;
break;
}
asmand(&p->from, reg[p->to.type]);
break;
case 6: /* double shift */
z = p->from.type;
switch(z) {
default:
goto bad;
case D_CONST:
*andptr++ = 0x0f;
*andptr++ = t[4];
asmand(&p->to, reg[p->from.index]);
*andptr++ = p->from.offset;
break;
case D_CL:
case D_CX:
*andptr++ = 0x0f;
*andptr++ = t[5];
asmand(&p->to, reg[p->from.index]);
break;
}
break;
case 7: /* imul rm,r */
*andptr++ = t[4];
*andptr++ = t[5];
asmand(&p->from, reg[p->to.type]);
break;
}
}
void
asmins(Prog *p)
{
andptr = and;
doasm(p);
}
enum{
ABSD = 0,
ABSU = 1,
RELD = 2,
RELU = 3,
};
int modemap[4] = { 0, 1, -1, 2, };
typedef struct Reloc Reloc;
struct Reloc
{
int n;
int t;
uchar *m;
ulong *a;
};
Reloc rels;
static void
grow(Reloc *r)
{
int t;
uchar *m, *nm;
ulong *a, *na;
t = r->t;
r->t += 64;
m = r->m;
a = r->a;
r->m = nm = malloc(r->t*sizeof(uchar));
r->a = na = malloc(r->t*sizeof(ulong));
memmove(nm, m, t*sizeof(uchar));
memmove(na, a, t*sizeof(ulong));
free(m);
free(a);
}
void
dynreloc(Sym *s, ulong v, int abs)
{
int i, k, n;
uchar *m;
ulong *a;
Reloc *r;
if(s->type == SUNDEF)
k = abs ? ABSU : RELU;
else
k = abs ? ABSD : RELD;
/* Bprint(&bso, "R %s a=%ld(%lx) %d\n", s->name, v, v, k); */
k = modemap[k];
r = &rels;
n = r->n;
if(n >= r->t)
grow(r);
m = r->m;
a = r->a;
for(i = n; i > 0; i--){
if(v < a[i-1]){ /* happens occasionally for data */
m[i] = m[i-1];
a[i] = a[i-1];
}
else
break;
}
m[i] = k;
a[i] = v;
r->n++;
}
static int
sput(char *s)
{
char *p;
p = s;
while(*s)
cput(*s++);
cput(0);
return s-p+1;
}
void
asmdyn()
{
int i, n, t, c;
Sym *s;
ulong la, ra, *a;
vlong off;
uchar *m;
Reloc *r;
cflush();
off = seek(cout, 0, 1);
lput(0);
t = 0;
lput(imports);
t += 4;
for(i = 0; i < NHASH; i++)
for(s = hash[i]; s != S; s = s->link)
if(s->type == SUNDEF){
lput(s->sig);
t += 4;
t += sput(s->name);
}
la = 0;
r = &rels;
n = r->n;
m = r->m;
a = r->a;
lput(n);
t += 4;
for(i = 0; i < n; i++){
ra = *a-la;
if(*a < la)
diag("bad relocation order");
if(ra < 256)
c = 0;
else if(ra < 65536)
c = 1;
else
c = 2;
cput((c<<6)|*m++);
t++;
if(c == 0){
cput(ra);
t++;
}
else if(c == 1){
wput(ra);
t += 2;
}
else{
lput(ra);
t += 4;
}
la = *a++;
}
cflush();
seek(cout, off, 0);
lput(t);
if(debug['v']){
Bprint(&bso, "import table entries = %d\n", imports);
Bprint(&bso, "export table entries = %d\n", exports);
}
}