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go / go / dcf53189900b814925475b09770092d06f362ebc / . / src / cmd / 6l / span.c
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// Inferno utils/6l/span.c
// http://code.google.com/p/inferno-os/source/browse/utils/6l/span.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// Instruction layout.
#include "l.h"
#include "../ld/lib.h"
static int rexflag;
static int asmode;
static vlong vaddr(Adr*, Reloc*);
void
span1(Sym *s)
{
Prog *p, *q;
int32 c, v, loop;
uchar *bp;
int n, m, i;
cursym = s;
if(s->p != nil)
return;
for(p = s->text; p != P; p = p->link) {
p->back = 2; // use short branches first time through
if((q = p->pcond) != P && (q->back & 2))
p->back |= 1; // backward jump
if(p->as == AADJSP) {
p->to.type = D_SP;
v = -p->from.offset;
p->from.offset = v;
p->as = p->mode != 64? AADDL: AADDQ;
if(v < 0) {
p->as = p->mode != 64? ASUBL: ASUBQ;
v = -v;
p->from.offset = v;
}
if(v == 0)
p->as = ANOP;
}
}
n = 0;
do {
loop = 0;
memset(s->r, 0, s->nr*sizeof s->r[0]);
s->nr = 0;
s->np = 0;
c = 0;
for(p = s->text; p != P; p = p->link) {
p->pc = c;
// process forward jumps to p
for(q = p->comefrom; q != P; q = q->forwd) {
v = p->pc - (q->pc + q->mark);
if(q->back & 2) { // short
if(v > 127) {
loop++;
q->back ^= 2;
}
if(q->as == AJCXZL)
s->p[q->pc+2] = v;
else
s->p[q->pc+1] = v;
} else {
bp = s->p + q->pc + q->mark - 4;
*bp++ = v;
*bp++ = v>>8;
*bp++ = v>>16;
*bp = v>>24;
}
}
p->comefrom = P;
asmins(p);
p->pc = c;
m = andptr-and;
symgrow(s, p->pc+m);
memmove(s->p+p->pc, and, m);
p->mark = m;
c += m;
}
if(++n > 20) {
diag("span must be looping");
errorexit();
}
} while(loop);
s->size = c;
if(debug['a'] > 1) {
print("span1 %s %lld (%d tries)\n %.6ux", s->name, s->size, n, 0);
for(i=0; i<s->np; i++) {
print(" %.2ux", s->p[i]);
if(i%16 == 15)
print("\n %.6ux", i+1);
}
if(i%16)
print("\n");
for(i=0; i<s->nr; i++) {
Reloc *r;
r = &s->r[i];
print(" rel %#.4ux/%d %s%+lld\n", r->off, r->siz, r->sym->name, r->add);
}
}
}
void
span(void)
{
Prog *p, *q;
int32 v;
int n;
if(debug['v'])
Bprint(&bso, "%5.2f span\n", cputime());
// NOTE(rsc): If we get rid of the globals we should
// be able to parallelize these iterations.
for(cursym = textp; cursym != nil; cursym = cursym->next) {
if(cursym->p != nil)
continue;
// TODO: move into span1
for(p = cursym->text; p != P; p = p->link) {
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 = p->mode != 64? AADDL: AADDQ;
if(v < 0) {
p->as = p->mode != 64? ASUBL: ASUBQ;
v = -v;
p->from.offset = v;
}
if(v == 0)
p->as = ANOP;
}
}
span1(cursym);
}
}
void
xdefine(char *p, int t, vlong v)
{
Sym *s;
s = lookup(p, 0);
s->type = t;
s->value = v;
s->reachable = 1;
s->special = 1;
}
void
instinit(void)
{
int c, i;
for(i=1; optab[i].as; i++) {
c = optab[i].as;
if(opindex[c] != nil) {
diag("phase error in optab: %d (%A)", i, c);
errorexit();
}
opindex[c] = &optab[i];
}
for(i=0; i<Ymax; i++)
ycover[i*Ymax + i] = 1;
ycover[Yi0*Ymax + Yi8] = 1;
ycover[Yi1*Ymax + Yi8] = 1;
ycover[Yi0*Ymax + Ys32] = 1;
ycover[Yi1*Ymax + Ys32] = 1;
ycover[Yi8*Ymax + Ys32] = 1;
ycover[Yi0*Ymax + Yi32] = 1;
ycover[Yi1*Ymax + Yi32] = 1;
ycover[Yi8*Ymax + Yi32] = 1;
ycover[Ys32*Ymax + Yi32] = 1;
ycover[Yi0*Ymax + Yi64] = 1;
ycover[Yi1*Ymax + Yi64] = 1;
ycover[Yi8*Ymax + Yi64] = 1;
ycover[Ys32*Ymax + Yi64] = 1;
ycover[Yi32*Ymax + Yi64] = 1;
ycover[Yal*Ymax + Yrb] = 1;
ycover[Ycl*Ymax + Yrb] = 1;
ycover[Yax*Ymax + Yrb] = 1;
ycover[Ycx*Ymax + Yrb] = 1;
ycover[Yrx*Ymax + Yrb] = 1;
ycover[Yrl*Ymax + Yrb] = 1;
ycover[Ycl*Ymax + Ycx] = 1;
ycover[Yax*Ymax + Yrx] = 1;
ycover[Ycx*Ymax + Yrx] = 1;
ycover[Yax*Ymax + Yrl] = 1;
ycover[Ycx*Ymax + Yrl] = 1;
ycover[Yrx*Ymax + Yrl] = 1;
ycover[Yf0*Ymax + Yrf] = 1;
ycover[Yal*Ymax + Ymb] = 1;
ycover[Ycl*Ymax + Ymb] = 1;
ycover[Yax*Ymax + Ymb] = 1;
ycover[Ycx*Ymax + Ymb] = 1;
ycover[Yrx*Ymax + Ymb] = 1;
ycover[Yrb*Ymax + Ymb] = 1;
ycover[Yrl*Ymax + Ymb] = 1;
ycover[Ym*Ymax + Ymb] = 1;
ycover[Yax*Ymax + Yml] = 1;
ycover[Ycx*Ymax + Yml] = 1;
ycover[Yrx*Ymax + Yml] = 1;
ycover[Yrl*Ymax + Yml] = 1;
ycover[Ym*Ymax + Yml] = 1;
ycover[Yax*Ymax + Ymm] = 1;
ycover[Ycx*Ymax + Ymm] = 1;
ycover[Yrx*Ymax + Ymm] = 1;
ycover[Yrl*Ymax + Ymm] = 1;
ycover[Ym*Ymax + Ymm] = 1;
ycover[Ymr*Ymax + Ymm] = 1;
ycover[Yax*Ymax + Yxm] = 1;
ycover[Ycx*Ymax + Yxm] = 1;
ycover[Yrx*Ymax + Yxm] = 1;
ycover[Yrl*Ymax + Yxm] = 1;
ycover[Ym*Ymax + Yxm] = 1;
ycover[Yxr*Ymax + Yxm] = 1;
for(i=0; i<D_NONE; i++) {
reg[i] = -1;
if(i >= D_AL && i <= D_R15B) {
reg[i] = (i-D_AL) & 7;
if(i >= D_SPB && i <= D_DIB)
regrex[i] = 0x40;
if(i >= D_R8B && i <= D_R15B)
regrex[i] = Rxr | Rxx | Rxb;
}
if(i >= D_AH && i<= D_BH)
reg[i] = 4 + ((i-D_AH) & 7);
if(i >= D_AX && i <= D_R15) {
reg[i] = (i-D_AX) & 7;
if(i >= D_R8)
regrex[i] = Rxr | Rxx | Rxb;
}
if(i >= D_F0 && i <= D_F0+7)
reg[i] = (i-D_F0) & 7;
if(i >= D_M0 && i <= D_M0+7)
reg[i] = (i-D_M0) & 7;
if(i >= D_X0 && i <= D_X0+15) {
reg[i] = (i-D_X0) & 7;
if(i >= D_X0+8)
regrex[i] = Rxr | Rxx | Rxb;
}
if(i >= D_CR+8 && i <= D_CR+15)
regrex[i] = Rxr;
}
}
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)
{
vlong v;
int32 l;
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; /* TO DO: Yi64 */
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_SPB:
*/
case D_BPB:
case D_SIB:
case D_DIB:
case D_R8B:
case D_R9B:
case D_R10B:
case D_R11B:
case D_R12B:
case D_R13B:
case D_R14B:
case D_R15B:
if(asmode != 64)
return Yxxx;
case D_DL:
case D_BL:
case D_AH:
case D_CH:
case D_DH:
case D_BH:
return Yrb;
case D_CL:
return Ycl;
case D_CX:
return Ycx;
case D_DX:
case D_BX:
return Yrx;
case D_R8: /* not really Yrl */
case D_R9:
case D_R10:
case D_R11:
case D_R12:
case D_R13:
case D_R14:
case D_R15:
if(asmode != 64)
return Yxxx;
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_M0+0:
case D_M0+1:
case D_M0+2:
case D_M0+3:
case D_M0+4:
case D_M0+5:
case D_M0+6:
case D_M0+7:
return Ymr;
case D_X0+0:
case D_X0+1:
case D_X0+2:
case D_X0+3:
case D_X0+4:
case D_X0+5:
case D_X0+6:
case D_X0+7:
case D_X0+8:
case D_X0+9:
case D_X0+10:
case D_X0+11:
case D_X0+12:
case D_X0+13:
case D_X0+14:
case D_X0+15:
return Yxr;
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_CR+8: return Ycr8;
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;
l = v;
if((vlong)l == v)
return Ys32; /* can sign extend */
if((v>>32) == 0)
return Yi32; /* unsigned */
return Yi64;
}
return Yi32; /* TO DO: D_ADDR as Yi64 */
case D_BRANCH:
return Ybr;
}
return Yxxx;
}
void
asmidx(int scale, int index, int base)
{
int i;
switch(index) {
default:
goto bad;
case D_NONE:
i = 4 << 3;
goto bas;
case D_R8:
case D_R9:
case D_R10:
case D_R11:
case D_R12:
case D_R13:
case D_R14:
case D_R15:
if(asmode != 64)
goto bad;
case D_AX:
case D_CX:
case D_DX:
case D_BX:
case D_BP:
case D_SI:
case D_DI:
i = reg[index] << 3;
break;
}
switch(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_R8:
case D_R9:
case D_R10:
case D_R11:
case D_R12:
case D_R13:
case D_R14:
case D_R15:
if(asmode != 64)
goto bad;
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/%d/%d", scale, index, base);
*andptr++ = 0;
return;
}
static void
put4(int32 v)
{
andptr[0] = v;
andptr[1] = v>>8;
andptr[2] = v>>16;
andptr[3] = v>>24;
andptr += 4;
}
static void
relput4(Prog *p, Adr *a)
{
vlong v;
Reloc rel, *r;
v = vaddr(a, &rel);
if(rel.siz != 0) {
if(rel.siz != 4)
diag("bad reloc");
r = addrel(cursym);
*r = rel;
r->off = p->pc + andptr - and;
}
put4(v);
}
static void
put8(vlong v)
{
andptr[0] = v;
andptr[1] = v>>8;
andptr[2] = v>>16;
andptr[3] = v>>24;
andptr[4] = v>>32;
andptr[5] = v>>40;
andptr[6] = v>>48;
andptr[7] = v>>56;
andptr += 8;
}
/*
static void
relput8(Prog *p, Adr *a)
{
vlong v;
Reloc rel, *r;
v = vaddr(a, &rel);
if(rel.siz != 0) {
r = addrel(cursym);
*r = rel;
r->siz = 8;
r->off = p->pc + andptr - and;
}
put8(v);
}
*/
vlong
symaddr(Sym *s)
{
if(!s->reachable)
diag("unreachable symbol in symaddr - %s", s->name);
return s->value;
}
static vlong
vaddr(Adr *a, Reloc *r)
{
int t;
vlong v;
Sym *s;
if(r != nil)
memset(r, 0, sizeof *r);
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->reachable)
diag("unreachable symbol in vaddr - %s", s->name);
if(r == nil) {
diag("need reloc for %D", a);
errorexit();
}
r->type = D_ADDR;
r->siz = 4; // TODO: 8 for external symbols
r->off = -1; // caller must fill in
r->sym = s;
r->add = v;
v = 0;
}
return v;
}
static void
asmandsz(Adr *a, int r, int rex, int m64)
{
int32 v;
int t, scale;
Reloc rel;
USED(m64);
rex &= (0x40 | Rxr);
v = a->offset;
t = a->type;
rel.siz = 0;
if(a->index != D_NONE) {
if(t < D_INDIR) {
switch(t) {
default:
goto bad;
case D_STATIC:
case D_EXTERN:
t = D_NONE;
v = vaddr(a, &rel);
break;
case D_AUTO:
case D_PARAM:
t = D_SP;
break;
}
} else
t -= D_INDIR;
rexflag |= (regrex[(int)a->index] & Rxx) | (regrex[t] & Rxb) | rex;
if(t == D_NONE) {
*andptr++ = (0 << 6) | (4 << 0) | (r << 3);
asmidx(a->scale, a->index, t);
goto putrelv;
}
if(v == 0 && rel.siz == 0 && t != D_BP && t != D_R13) {
*andptr++ = (0 << 6) | (4 << 0) | (r << 3);
asmidx(a->scale, a->index, t);
return;
}
if(v >= -128 && v < 128 && rel.siz == 0) {
*andptr++ = (1 << 6) | (4 << 0) | (r << 3);
asmidx(a->scale, a->index, t);
*andptr++ = v;
return;
}
*andptr++ = (2 << 6) | (4 << 0) | (r << 3);
asmidx(a->scale, a->index, t);
goto putrelv;
}
if(t >= D_AL && t <= D_X0+15) {
if(v)
goto bad;
*andptr++ = (3 << 6) | (reg[t] << 0) | (r << 3);
rexflag |= (regrex[t] & (0x40 | Rxb)) | rex;
return;
}
scale = a->scale;
if(t < D_INDIR) {
switch(a->type) {
default:
goto bad;
case D_STATIC:
case D_EXTERN:
t = D_NONE;
v = vaddr(a, &rel);
break;
case D_AUTO:
case D_PARAM:
t = D_SP;
break;
}
scale = 1;
} else
t -= D_INDIR;
rexflag |= (regrex[t] & Rxb) | rex;
if(t == D_NONE || (D_CS <= t && t <= D_GS)) {
if(asmode != 64){
*andptr++ = (0 << 6) | (5 << 0) | (r << 3);
goto putrelv;
}
/* temporary */
*andptr++ = (0 << 6) | (4 << 0) | (r << 3); /* sib present */
*andptr++ = (0 << 6) | (4 << 3) | (5 << 0); /* DS:d32 */
goto putrelv;
}
if(t == D_SP || t == D_R12) {
if(v == 0) {
*andptr++ = (0 << 6) | (reg[t] << 0) | (r << 3);
asmidx(scale, D_NONE, t);
return;
}
if(v >= -128 && v < 128) {
*andptr++ = (1 << 6) | (reg[t] << 0) | (r << 3);
asmidx(scale, D_NONE, t);
*andptr++ = v;
return;
}
*andptr++ = (2 << 6) | (reg[t] << 0) | (r << 3);
asmidx(scale, D_NONE, t);
goto putrelv;
}
if(t >= D_AX && t <= D_R15) {
if(v == 0 && t != D_BP && t != D_R13) {
*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);
goto putrelv;
}
goto bad;
putrelv:
if(rel.siz != 0) {
Reloc *r;
if(rel.siz != 4) {
diag("bad rel");
goto bad;
}
r = addrel(cursym);
*r = rel;
r->off = curp->pc + andptr - and;
}
put4(v);
return;
bad:
diag("asmand: bad address %D", a);
return;
}
void
asmand(Adr *a, Adr *ra)
{
asmandsz(a, reg[ra->type], regrex[ra->type], 0);
}
void
asmando(Adr *a, int o)
{
asmandsz(a, o, 0, 0);
}
static void
bytereg(Adr *a, char *t)
{
if(a->index == D_NONE && (a->type >= D_AX && a->type <= D_R15)) {
a->type = D_AL + (a->type-D_AX);
*t = 0;
}
}
#define E 0xff
Movtab 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},
{APUSHQ, Yfs, Ynone, 0, 0x0f,0xa0,E,0},
{APUSHQ, 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},
{APOPQ, Ynone, Yfs, 0, 0x0f,0xa1,E,0},
{APOPQ, 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, Ycr8, Yml, 3, 0x0f,0x20,8,0},
{AMOVQ, Ycr0, Yml, 3, 0x0f,0x20,0,0},
{AMOVQ, Ycr2, Yml, 3, 0x0f,0x20,2,0},
{AMOVQ, Ycr3, Yml, 3, 0x0f,0x20,3,0},
{AMOVQ, Ycr4, Yml, 3, 0x0f,0x20,4,0},
{AMOVQ, Ycr8, Yml, 3, 0x0f,0x20,8,0},
{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},
{AMOVL, Yml, Ycr8, 4, 0x0f,0x22,8,0},
{AMOVQ, Yml, Ycr0, 4, 0x0f,0x22,0,0},
{AMOVQ, Yml, Ycr2, 4, 0x0f,0x22,2,0},
{AMOVQ, Yml, Ycr3, 4, 0x0f,0x22,3,0},
{AMOVQ, Yml, Ycr4, 4, 0x0f,0x22,4,0},
{AMOVQ, Yml, Ycr8, 4, 0x0f,0x22,8,0},
/* 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},
{AMOVQ, Ydr0, Yml, 3, 0x0f,0x21,0,0},
{AMOVQ, Ydr6, Yml, 3, 0x0f,0x21,6,0},
{AMOVQ, 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},
{AMOVQ, Yml, Ydr0, 4, 0x0f,0x23,0,0},
{AMOVQ, Yml, Ydr6, 4, 0x0f,0x23,6,0},
{AMOVQ, 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},
{AMOVQ, Ym, Ygdtr, 4, 0x0f,0x01,2,0},
{AMOVQ, Ygdtr, Ym, 3, 0x0f,0x01,0,0},
{AMOVQ, Ym, Yidtr, 4, 0x0f,0x01,3,0},
{AMOVQ, 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},
{ASHLQ, Ycol, Yml, 6, Pw,0xa4,0xa5,0},
{ASHRQ, Ycol, Yml, 6, Pw,0xac,0xad,0},
{ASHLW, Ycol, Yml, 6, Pe,0xa4,0xa5,0},
{ASHRW, Ycol, Yml, 6, Pe,0xac,0xad,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);
}
static int
mediaop(Optab *o, int op, int osize, int z)
{
switch(op){
case Pm:
case Pe:
case Pf2:
case Pf3:
if(osize != 1){
if(op != Pm)
*andptr++ = op;
*andptr++ = Pm;
op = o->op[++z];
break;
}
default:
if(andptr == and || andptr[-1] != Pm)
*andptr++ = Pm;
break;
}
*andptr++ = op;
return z;
}
void
doasm(Prog *p)
{
Optab *o;
Prog *q, pp;
uchar *t;
Movtab *mo;
int z, op, ft, tt, xo, l, pre;
vlong v;
Reloc rel, *r;
Adr *a;
curp = p; // TODO
o = opindex[p->as];
if(o == nil) {
diag("asmins: missing op %P", p);
return;
}
pre = prefixof(&p->from);
if(pre)
*andptr++ = pre;
pre = prefixof(&p->to);
if(pre)
*andptr++ = pre;
if(p->ft == 0)
p->ft = oclass(&p->from);
if(p->tt == 0)
p->tt = oclass(&p->to);
ft = p->ft * Ymax;
tt = p->tt * Ymax;
t = o->ytab;
if(t == 0) {
diag("asmins: noproto %P", p);
return;
}
xo = o->op[0] == 0x0f;
for(z=0; *t; z+=t[3]+xo,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 Pf2: /* xmm opcode escape */
case Pf3:
*andptr++ = o->prefix;
*andptr++ = Pm;
break;
case Pm: /* opcode escape */
*andptr++ = Pm;
break;
case Pe: /* 16 bit escape */
*andptr++ = Pe;
break;
case Pw: /* 64-bit escape */
if(p->mode != 64)
diag("asmins: illegal 64: %P", p);
rexflag |= Pw;
break;
case Pb: /* botch */
bytereg(&p->from, &p->ft);
bytereg(&p->to, &p->tt);
break;
case P32: /* 32 bit but illegal if 64-bit mode */
if(p->mode == 64)
diag("asmins: illegal in 64-bit mode: %P", p);
break;
case Py: /* 64-bit only, no prefix */
if(p->mode != 64)
diag("asmins: illegal in %d-bit mode: %P", p->mode, p);
break;
}
op = o->op[z];
if(op == 0x0f) {
*andptr++ = op;
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 Zlitm_r:
for(; op = o->op[z]; z++)
*andptr++ = op;
asmand(&p->from, &p->to);
break;
case Zmb_r:
bytereg(&p->from, &p->ft);
/* fall through */
case Zm_r:
*andptr++ = op;
asmand(&p->from, &p->to);
break;
case Zm_r_xm:
mediaop(o, op, t[3], z);
asmand(&p->from, &p->to);
break;
case Zm_r_xm_nr:
rexflag = 0;
mediaop(o, op, t[3], z);
asmand(&p->from, &p->to);
break;
case Zm_r_i_xm:
mediaop(o, op, t[3], z);
asmand(&p->from, &p->to);
*andptr++ = p->to.offset;
break;
case Zm_r_3d:
*andptr++ = 0x0f;
*andptr++ = 0x0f;
asmand(&p->from, &p->to);
*andptr++ = op;
break;
case Zibm_r:
*andptr++ = op;
asmand(&p->from, &p->to);
*andptr++ = p->to.offset;
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, &p->to);
p->from.index = p->from.type;
p->from.type = D_ADDR;
break;
case Zm_o:
*andptr++ = op;
asmando(&p->from, o->op[z+1]);
break;
case Zr_m:
*andptr++ = op;
asmand(&p->to, &p->from);
break;
case Zr_m_xm:
mediaop(o, op, t[3], z);
asmand(&p->to, &p->from);
break;
case Zr_m_xm_nr:
rexflag = 0;
mediaop(o, op, t[3], z);
asmand(&p->to, &p->from);
break;
case Zr_m_i_xm:
mediaop(o, op, t[3], z);
asmand(&p->to, &p->from);
*andptr++ = p->from.offset;
break;
case Zo_m:
*andptr++ = op;
asmando(&p->to, o->op[z+1]);
break;
case Zo_m64:
*andptr++ = op;
asmandsz(&p->to, o->op[z+1], 0, 1);
break;
case Zm_ibo:
*andptr++ = op;
asmando(&p->from, o->op[z+1]);
*andptr++ = vaddr(&p->to, nil);
break;
case Zibo_m:
*andptr++ = op;
asmando(&p->to, o->op[z+1]);
*andptr++ = vaddr(&p->from, nil);
break;
case Zibo_m_xm:
z = mediaop(o, op, t[3], z);
asmando(&p->to, o->op[z+1]);
*andptr++ = vaddr(&p->from, nil);
break;
case Z_ib:
case Zib_:
if(t[2] == Zib_)
a = &p->from;
else
a = &p->to;
*andptr++ = op;
*andptr++ = vaddr(a, nil);
break;
case Zib_rp:
rexflag |= regrex[p->to.type] & (Rxb|0x40);
*andptr++ = op + reg[p->to.type];
*andptr++ = vaddr(&p->from, nil);
break;
case Zil_rp:
rexflag |= regrex[p->to.type] & Rxb;
*andptr++ = op + reg[p->to.type];
if(o->prefix == Pe) {
v = vaddr(&p->from, nil);
*andptr++ = v;
*andptr++ = v>>8;
}
else
relput4(p, &p->from);
break;
case Zo_iw:
*andptr++ = op;
if(p->from.type != D_NONE){
v = vaddr(&p->from, nil);
*andptr++ = v;
*andptr++ = v>>8;
}
break;
case Ziq_rp:
v = vaddr(&p->from, &rel);
l = v>>32;
if(l == 0 && rel.siz != 8){
//p->mark |= 0100;
//print("zero: %llux %P\n", v, p);
rexflag &= ~(0x40|Rxw);
rexflag |= regrex[p->to.type] & Rxb;
*andptr++ = 0xb8 + reg[p->to.type];
if(rel.type != 0) {
r = addrel(cursym);
*r = rel;
r->off = p->pc + andptr - and;
}
put4(v);
}else if(l == -1 && (v&((uvlong)1<<31))!=0){ /* sign extend */
//p->mark |= 0100;
//print("sign: %llux %P\n", v, p);
*andptr ++ = 0xc7;
asmando(&p->to, 0);
put4(v);
}else{ /* need all 8 */
//print("all: %llux %P\n", v, p);
rexflag |= regrex[p->to.type] & Rxb;
*andptr++ = op + reg[p->to.type];
if(rel.type != 0) {
r = addrel(cursym);
*r = rel;
r->off = p->pc + andptr - and;
}
put8(v);
}
break;
case Zib_rr:
*andptr++ = op;
asmand(&p->to, &p->to);
*andptr++ = vaddr(&p->from, nil);
break;
case Z_il:
case Zil_:
if(t[2] == Zil_)
a = &p->from;
else
a = &p->to;
*andptr++ = op;
if(o->prefix == Pe) {
v = vaddr(a, nil);
*andptr++ = v;
*andptr++ = v>>8;
}
else
relput4(p, a);
break;
case Zm_ilo:
case Zilo_m:
*andptr++ = op;
if(t[2] == Zilo_m) {
a = &p->from;
asmando(&p->to, o->op[z+1]);
} else {
a = &p->to;
asmando(&p->from, o->op[z+1]);
}
if(o->prefix == Pe) {
v = vaddr(a, nil);
*andptr++ = v;
*andptr++ = v>>8;
}
else
relput4(p, a);
break;
case Zil_rr:
*andptr++ = op;
asmand(&p->to, &p->to);
if(o->prefix == Pe) {
v = vaddr(&p->from, nil);
*andptr++ = v;
*andptr++ = v>>8;
}
else
relput4(p, &p->from);
break;
case Z_rp:
rexflag |= regrex[p->to.type] & (Rxb|0x40);
*andptr++ = op + reg[p->to.type];
break;
case Zrp_:
rexflag |= regrex[p->from.type] & (Rxb|0x40);
*andptr++ = op + reg[p->from.type];
break;
case Zclr:
*andptr++ = op;
asmand(&p->to, &p->to);
break;
case Zcall:
q = p->pcond;
if(q == nil) {
diag("call without target");
errorexit();
}
if(q->as != ATEXT) {
// Could handle this case by making D_PCREL
// record the Prog* instead of the Sym*, but let's
// wait until the need arises.
diag("call of non-TEXT %P", q);
errorexit();
}
*andptr++ = op;
r = addrel(cursym);
r->off = p->pc + andptr - and;
r->sym = q->from.sym;
r->type = D_PCREL;
r->siz = 4;
put4(0);
break;
case Zbr:
case Zjmp:
case Zloop:
// TODO: jump across functions needs reloc
q = p->pcond;
if(q == nil) {
diag("jmp/branch/loop without target");
errorexit();
}
if(q->as == ATEXT) {
if(t[2] == Zbr) {
diag("branch to ATEXT");
errorexit();
}
*andptr++ = o->op[z+1];
r = addrel(cursym);
r->off = p->pc + andptr - and;
r->sym = q->from.sym;
r->type = D_PCREL;
r->siz = 4;
put4(0);
break;
}
// Assumes q is in this function.
// TODO: Check in input, preserve in brchain.
// Fill in backward jump now.
if(p->back & 1) {
v = q->pc - (p->pc + 2);
if(v >= -128) {
if(p->as == AJCXZL)
*andptr++ = 0x67;
*andptr++ = op;
*andptr++ = v;
} else if(t[2] == Zloop) {
diag("loop too far: %P", p);
} else {
v -= 5-2;
if(t[2] == Zbr) {
*andptr++ = 0x0f;
v--;
}
*andptr++ = o->op[z+1];
*andptr++ = v;
*andptr++ = v>>8;
*andptr++ = v>>16;
*andptr++ = v>>24;
}
break;
}
// Annotate target; will fill in later.
p->forwd = q->comefrom;
q->comefrom = p;
if(p->back & 2) { // short
if(p->as == AJCXZL)
*andptr++ = 0x67;
*andptr++ = op;
*andptr++ = 0;
} else if(t[2] == Zloop) {
diag("loop too far: %P", p);
} else {
if(t[2] == Zbr)
*andptr++ = 0x0f;
*andptr++ = o->op[z+1];
*andptr++ = 0;
*andptr++ = 0;
*andptr++ = 0;
*andptr++ = 0;
}
break;
/*
v = q->pc - p->pc - 2;
if((v >= -128 && v <= 127) || p->pc == -1 || q->pc == -1) {
*andptr++ = op;
*andptr++ = v;
} else {
v -= 5-2;
if(t[2] == Zbr) {
*andptr++ = 0x0f;
v--;
}
*andptr++ = o->op[z+1];
*andptr++ = v;
*andptr++ = v>>8;
*andptr++ = v>>16;
*andptr++ = v>>24;
}
*/
break;
case Zbyte:
v = vaddr(&p->from, &rel);
if(rel.siz != 0) {
rel.siz = op;
r = addrel(cursym);
*r = rel;
r->off = p->pc + andptr - and;
}
*andptr++ = v;
if(op > 1) {
*andptr++ = v>>8;
if(op > 2) {
*andptr++ = v>>16;
*andptr++ = v>>24;
if(op > 4) {
*andptr++ = v>>32;
*andptr++ = v>>40;
*andptr++ = v>>48;
*andptr++ = v>>56;
}
}
}
break;
}
return;
domov:
for(mo=ymovtab; mo->as; mo++)
if(p->as == mo->as)
if(ycover[ft+mo->ft])
if(ycover[tt+mo->tt]){
t = mo->op;
goto mfound;
}
bad:
if(p->mode != 64){
/*
* 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 */
asmando(&p->from, reg[D_BX]);
subreg(&pp, z, D_BX);
doasm(&pp);
*andptr++ = 0x87; /* xchg lhs,bx */
asmando(&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 */
asmando(&p->to, reg[D_BX]);
subreg(&pp, z, D_BX);
doasm(&pp);
*andptr++ = 0x87; /* xchg rhs,bx */
asmando(&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 from=%ux to=%ux %P", p->from.type, p->to.type, p);
return;
mfound:
switch(mo->code) {
default:
diag("asmins: unknown mov %d %P", mo->code, p);
break;
case 0: /* lit */
for(z=0; t[z]!=E; z++)
*andptr++ = t[z];
break;
case 1: /* r,m */
*andptr++ = t[0];
asmando(&p->to, t[1]);
break;
case 2: /* m,r */
*andptr++ = t[0];
asmando(&p->from, t[1]);
break;
case 3: /* r,m - 2op */
*andptr++ = t[0];
*andptr++ = t[1];
asmando(&p->to, t[2]);
rexflag |= regrex[p->from.type] & (Rxr|0x40);
break;
case 4: /* m,r - 2op */
*andptr++ = t[0];
*andptr++ = t[1];
asmando(&p->from, t[2]);
rexflag |= regrex[p->to.type] & (Rxr|0x40);
break;
case 5: /* load full pointer, trash heap */
if(t[0])
*andptr++ = t[0];
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, &p->to);
break;
case 6: /* double shift */
if(t[0] == Pw){
if(p->mode != 64)
diag("asmins: illegal 64: %P", p);
rexflag |= Pw;
t++;
}else if(t[0] == Pe){
*andptr++ = Pe;
t++;
}
z = p->from.type;
switch(z) {
default:
goto bad;
case D_CONST:
*andptr++ = 0x0f;
*andptr++ = t[0];
asmandsz(&p->to, reg[(int)p->from.index], regrex[(int)p->from.index], 0);
*andptr++ = p->from.offset;
break;
case D_CL:
case D_CX:
*andptr++ = 0x0f;
*andptr++ = t[1];
asmandsz(&p->to, reg[(int)p->from.index], regrex[(int)p->from.index], 0);
break;
}
break;
}
}
void
asmins(Prog *p)
{
int n, np, c;
Reloc *r;
rexflag = 0;
andptr = and;
asmode = p->mode;
doasm(p);
if(rexflag){
/*
* as befits the whole approach of the architecture,
* the rex prefix must appear before the first opcode byte
* (and thus after any 66/67/f2/f3/26/2e/3e prefix bytes, but
* before the 0f opcode escape!), or it might be ignored.
* note that the handbook often misleadingly shows 66/f2/f3 in `opcode'.
*/
if(p->mode != 64)
diag("asmins: illegal in mode %d: %P", p->mode, p);
n = andptr - and;
for(np = 0; np < n; np++) {
c = and[np];
if(c != 0xf2 && c != 0xf3 && (c < 0x64 || c > 0x67) && c != 0x2e && c != 0x3e && c != 0x26)
break;
}
for(r=cursym->r+cursym->nr; r-- > cursym->r; ) {
if(r->off < p->pc)
break;
r->off++;
}
memmove(and+np+1, and+np, n-np);
and[np] = 0x40 | rexflag;
andptr++;
}
}