5a, 5c, 5g, 5l: fix build for Linux/ARM.

ARM doesn't have the concept of scale, so I renamed the field
Addr.scale to Addr.flag to better reflect its true meaning.

R=rsc
CC=golang-dev
https://golang.org/cl/5687044

src/cmd/5a/lex.c

@@ -491,6 +491,7 @@ zaddr(Gen *a, int s)
 
 	Bputc(&obuf, a->type);
 	Bputc(&obuf, a->reg);
+	Bputc(&obuf, 0); // flag
 	Bputc(&obuf, s);
 	Bputc(&obuf, a->name);
 	switch(a->type) {

src/cmd/5c/swt.c

@@ -564,9 +564,10 @@ zaddr(char *bp, Adr *a, int s)
 
 	bp[0] = a->type;
 	bp[1] = a->reg;
-	bp[2] = s;
+	bp[2] = 0; // flag
-	bp[3] = a->name;
+	bp[3] = s;
-	bp += 4;
+	bp[4] = a->name;
+	bp += 5;
 	switch(a->type) {
 	default:
 		diag(Z, "unknown type %d in zaddr", a->type);

src/cmd/5g/gg.h

@@ -27,6 +27,7 @@ struct	Addr
 	uchar	reg;
 	char pun;
 	uchar	etype;
+	char	flag;
 };
 #define	A	((Addr*)0)
 

src/cmd/5g/gobj.c

@@ -93,6 +93,7 @@ zaddr(Biobuf *b, Addr *a, int s)
 	default:
 		Bputc(b, a->type);
 		Bputc(b, a->reg);
+		Bputc(b, a->flag);
 		Bputc(b, s);
 		Bputc(b, a->name);
 	}

src/cmd/5g/gsubr.c

@@ -254,9 +254,9 @@ ggloblnod(Node *nam, int32 width)
 	p->to.type = D_CONST;
 	p->to.offset = width;
 	if(nam->readonly)
-		p->from.scale = RODATA;
+		p->from.flag = RODATA;
 	if(nam->type != T && !haspointers(nam->type))
-		p->from.scale |= NOPTR;
+		p->from.flag |= NOPTR;
 }
 
 void
@@ -273,6 +273,7 @@ ggloblsym(Sym *s, int32 width, int dupok)
 	p->to.offset = width;
 	if(dupok)
 		p->reg = DUPOK;
+	p->from.flag |= RODATA;
 }
 
 int

src/cmd/5l/asm.c

@@ -74,6 +74,7 @@ enum {
 	ElfStrRelPlt,
 	ElfStrPlt,
 	ElfStrNoteNetbsdIdent,
+	ElfStrNoPtrData,
 	NElfStr
 };
 
@@ -164,6 +165,7 @@ doelf(void)
 
 	elfstr[ElfStrEmpty] = addstring(shstrtab, "");
 	elfstr[ElfStrText] = addstring(shstrtab, ".text");
+	elfstr[ElfStrNoPtrData] = addstring(shstrtab, ".noptrdata");
 	elfstr[ElfStrData] = addstring(shstrtab, ".data");
 	elfstr[ElfStrBss] = addstring(shstrtab, ".bss");
 	if(HEADTYPE == Hnetbsd)

src/cmd/5l/l.h

@@ -76,6 +76,7 @@ struct	Adr
 	uchar	index; // not used on arm, required by ld/go.c
 	char	reg;
 	char	name;
+	char	flag;
 	int32	offset2; // argsize
 	char	class;
 	Sym*	gotype;

src/cmd/5l/obj.c

@@ -301,6 +301,7 @@ zaddr(Biobuf *f, Adr *a, Sym *h[])
 
 	a->type = Bgetc(f);
 	a->reg = Bgetc(f);
+	a->flag = Bgetc(f);
 	c = Bgetc(f);
 	if(c < 0 || c > NSYM){
 		print("sym out of range: %d\n", c);
@@ -549,9 +550,9 @@ loop:
 			s->size = p->to.offset;
 		if(p->reg & DUPOK)
 			s->dupok = 1;
-		if(p->from.scale & RODATA)
+		if(p->from.flag & RODATA)
 			s->type = SRODATA;
-		else if(p->from.scale & NOPTR)
+		else if(p->from.flag & NOPTR)
 			s->type = SNOPTRDATA;
 		break;
 

src/libmach/5obj.c

@@ -112,7 +112,7 @@ addr(Biobuf *bp)
 	long off;
 
 	a.type = Bgetc(bp);	/* a.type */
-	skip(bp,1);		/* reg */
+	skip(bp,2);		/* reg, flag */
 	a.sym = Bgetc(bp);	/* sym index */
 	a.name = Bgetc(bp);	/* sym type */
 	switch(a.type){