cmd/5c, cmd/5g, cmd/5l, liblink: nacl/arm support

LGTM=dave, rsc
R=rsc, iant, dave
CC=golang-codereviews
https://golang.org/cl/108360043

src/cmd/5c/peep.c

@@ -853,11 +853,15 @@ xtramodes(Reg *r, Addr *a)
 				switch (p1->from.type) {
 				case D_REG:
 					/* register offset */
+					if(nacl)
+						return 0;
 					a->type = D_SHIFT;
 					a->offset = p1->from.reg;
 					break;
 				case D_SHIFT:
 					/* scaled register offset */
+					if(nacl)
+						return 0;
 					a->type = D_SHIFT;
 				case D_CONST:
 					/* immediate offset */

src/cmd/5c/reg.c

@@ -204,6 +204,16 @@ regopt(Prog *p)
 			break;
 		}
 
+		/* the mod/div runtime routines smash R12 */
+		switch(p->as) {
+		case AMOD:
+		case AMODU:
+		case ADIV:
+		case ADIVU:
+			regbits |= RtoB(12);
+			break;
+		}
+
 		if(p->as == AMOVM) {
 			if(p->from.type == D_CONST)
 				z = p->from.offset;

src/cmd/5c/swt.c

@@ -60,7 +60,7 @@ swit2(C1 *q, int nc, int32 def, Node *n)
 
 	if(nc >= 3) {
 		i = (q+nc-1)->val - (q+0)->val;
-		if(i > 0 && i < nc*2)
+		if(!nacl && i > 0 && i < nc*2)
 			goto direct;
 	}
 	if(nc < 5) {

src/cmd/5g/cgen.c

@@ -1497,7 +1497,7 @@ sgen(Node *n, Node *res, int64 w)
 	if(osrc < odst && odst < osrc+w)
 		dir = -dir;
 
-	if(op == AMOVW && dir > 0 && c >= 4 && c <= 128) {
+	if(op == AMOVW && !nacl && dir > 0 && c >= 4 && c <= 128) {
 		r0.op = OREGISTER;
 		r0.val.u.reg = REGALLOC_R0;
 		r1.op = OREGISTER;

src/cmd/5g/ggen.c

@@ -76,7 +76,7 @@ zerorange(Prog *p, vlong frame, vlong lo, vlong hi, uint32 *r0)
 	if(cnt < 4*widthptr) {
 		for(i = 0; i < cnt; i += widthptr) 
 			p = appendpp(p, AMOVW, D_REG, 0, 0, D_OREG, REGSP, 4+frame+lo+i);
-	} else if(cnt <= 128*widthptr) {
+	} else if(!nacl && (cnt <= 128*widthptr)) {
 		p = appendpp(p, AADD, D_CONST, NREG, 4+frame+lo, D_REG, 1, 0);
 		p->reg = REGSP;
 		p = appendpp(p, ADUFFZERO, D_NONE, NREG, 0, D_OREG, NREG, 0);
@@ -906,7 +906,7 @@ clearfat(Node *nl)
 		patch(gbranch(ABNE, T, 0), pl);
 
 		regfree(&end);
-	} else if(q >= 4) {
+	} else if(q >= 4 && !nacl) {
 		f = sysfunc("duffzero");
 		p = gins(ADUFFZERO, N, f);
 		afunclit(&p->to, f);

src/cmd/5g/peep.c

@@ -877,11 +877,15 @@ xtramodes(Graph *g, Flow *r, Adr *a)
 				switch (p1->from.type) {
 				case D_REG:
 					/* register offset */
+					if(nacl)
+						return 0;
 					a->type = D_SHIFT;
 					a->offset = p1->from.reg;
 					break;
 				case D_SHIFT:
 					/* scaled register offset */
+					if(nacl)
+						return 0;
 					a->type = D_SHIFT;
 				case D_CONST:
 					/* immediate offset */

src/cmd/5g/reg.c

@@ -227,6 +227,10 @@ regopt(Prog *firstp)
 				for(z=0; z<BITS; z++)
 					r->set.b[z] |= bit.b[z];
 		}
+
+		/* the mod/div runtime routines smash R12 */
+		if(p->as == ADIV || p->as == ADIVU || p->as == AMOD || p->as == AMODU)
+			r->set.b[z] |= RtoB(12);
 	}
 	if(firstr == R)
 		return;

src/cmd/5l/5.out.h

@@ -211,6 +211,8 @@ enum
 	AVARKILL,
 	ADUFFCOPY,
 	ADUFFZERO,
+	ADATABUNDLE,
+	ADATABUNDLEEND,
 
 	AMRC, // MRC/MCR
 

src/cmd/5l/asm.c

@@ -661,6 +661,7 @@ asmb(void)
 	case Hfreebsd:
 	case Hnetbsd:
 	case Hopenbsd:
+	case Hnacl:
 		asmbelf(symo);
 		break;
 	}

src/cmd/5l/obj.c

@@ -63,6 +63,7 @@ archinit(void)
 		break;
 	case Hlinux:
 	case Hfreebsd:
+	case Hnacl:
 		break;
 	}
 
@@ -82,7 +83,6 @@ archinit(void)
 	case Hlinux:	/* arm elf */
 	case Hfreebsd:
 	case Hnetbsd:
-	case Hnacl:
 		debug['d'] = 0;	// with dynamic linking
 		elfinit();
 		HEADR = ELFRESERVE;
@@ -93,6 +93,17 @@ archinit(void)
 		if(INITRND == -1)
 			INITRND = 4096;
 		break;
+	case Hnacl:
+		elfinit();
+		HEADR = 0x10000;
+		funcalign = 16;
+		if(INITTEXT == -1)
+			INITTEXT = 0x20000;
+		if(INITDAT == -1)
+			INITDAT = 0;
+		if(INITRND == -1)
+			INITRND = 0x10000;
+		break;
 	}
 	if(INITDAT != 0 && INITRND != 0)
 		print("warning: -D0x%ux is ignored because of -R0x%ux\n",

src/liblink/sym.c

@@ -154,6 +154,9 @@ linknew(LinkArch *arch)
 		case '8':
 			ctxt->tlsoffset = -8;
 			break;
+		case '5':
+			ctxt->tlsoffset = 0;
+			break;
 		}
 		break;