Import sources from 2011-03-30 iso image

1 files changed, 1396 insertions, 0 deletions

diff --git a/sys/src/cmd/vl/obj.c b/sys/src/cmd/vl/obj.c
new file mode 100755
index 000000000..8289c5884
--- /dev/null
+++ b/sys/src/cmd/vl/obj.c
@@ -0,0 +1,1396 @@
+#define	EXTERN
+#include	"l.h"
+#include	<ar.h>
+
+#ifndef	DEFAULT
+#define	DEFAULT	'9'
+#endif
+
+char	*noname		= "<none>";
+char	symname[]	= SYMDEF;
+char	thechar		= 'v';
+char	*thestring 	= "mips";
+
+/*
+ *	-H0 -T0x40004C -D0x10000000	is abbrev unix
+ *	-H1 -T0x80020000 -R4		is bootp() format for 3k
+ *	-H2 -T4128 -R4096		is plan9 format
+ *	-H3 -T0x80020000 -R8		is bootp() format for 4k
+ *	-H4 -T0x400000 -R4		is sgi unix coff executable
+ *	-H5 -T0x4000A0 -R4		is sgi unix elf executable
+ *	-H6						is headerless
+ */
+
+int little;
+
+void
+main(int argc, char *argv[])
+{
+	int c;
+	char *a;
+
+	Binit(&bso, 1, OWRITE);
+	cout = -1;
+	listinit();
+	outfile = 0;
+	nerrors = 0;
+	curtext = P;
+	HEADTYPE = -1;
+	INITTEXT = -1;
+	INITDAT = -1;
+	INITRND = -1;
+	INITENTRY = 0;
+
+	ARGBEGIN {
+	default:
+		c = ARGC();
+		if(c >= 0 && c < sizeof(debug))
+			debug[c]++;
+		break;
+	case 'o':
+		outfile = ARGF();
+		break;
+	case 'E':
+		a = ARGF();
+		if(a)
+			INITENTRY = a;
+		break;
+	case  'L':			/* for little-endian mips */
+		thechar = '0';
+		thestring = "spim";
+		little = 1;
+		break;
+	case 'T':
+		a = ARGF();
+		if(a)
+			INITTEXT = atolwhex(a);
+		break;
+	case 'D':
+		a = ARGF();
+		if(a)
+			INITDAT = atolwhex(a);
+		break;
+	case 'R':
+		a = ARGF();
+		if(a)
+			INITRND = atolwhex(a);
+		break;
+	case 'H':
+		a = ARGF();
+		if(a)
+			HEADTYPE = atolwhex(a);
+		/* do something about setting INITTEXT */
+		break;
+	} ARGEND
+
+	USED(argc);
+
+	if(*argv == 0) {
+		diag("usage: %cl [-options] objects", thechar);
+		errorexit();
+	}
+	if(!debug['9'] && !debug['U'] && !debug['B'])
+		debug[DEFAULT] = 1;
+	if(HEADTYPE == -1) {
+		if(debug['U'])
+			HEADTYPE = 0;
+		if(debug['B'])
+			HEADTYPE = 1;
+		if(debug['9'])
+			HEADTYPE = 2;
+	}
+	switch(HEADTYPE) {
+	default:
+		diag("unknown -H option");
+		errorexit();
+
+	case 0:	/* unix simple */
+		HEADR = 20L+56L;
+		if(INITTEXT == -1)
+			INITTEXT = 0x40004CL;
+		if(INITDAT == -1)
+			INITDAT = 0x10000000L;
+		if(INITRND == -1)
+			INITRND = 0;
+		break;
+	case 1:	/* boot for 3k */
+		HEADR = 20L+60L;
+		if(INITTEXT == -1)
+			INITTEXT = 0x80020000L;
+		if(INITDAT == -1)
+			INITDAT = 0;
+		if(INITRND == -1)
+			INITRND = 4;
+		break;
+	case 2:	/* plan 9 */
+		HEADR = 32L;
+		if(INITTEXT == -1)
+			INITTEXT = 4128;
+		if(INITDAT == -1)
+			INITDAT = 0;
+		if(INITRND == -1)
+			INITRND = 4096;
+		break;
+	case 3:	/* boot for 4k */
+		HEADR = 20L+56L+3*40L;
+		if(INITTEXT == -1)
+			INITTEXT = 0x80020000L;
+		if(INITDAT == -1)
+			INITDAT = 0;
+		if(INITRND == -1)
+			INITRND = 8;
+		break;
+	case 4:	/* sgi unix coff executable */
+		HEADR = 20L+56L+3*40L;
+		if(INITTEXT == -1)
+			INITTEXT = 0x00400000L+HEADR;
+		if(INITDAT == -1)
+			INITDAT = 0x10000000;
+		if(INITRND == -1)
+			INITRND = 0;
+		break;
+	case 5:	/* sgi unix elf executable */
+		HEADR = rnd(52L+3*32L, 16);
+		if(INITTEXT == -1)
+			INITTEXT = 0x00400000L+HEADR;
+		if(INITDAT == -1)
+			INITDAT = 0x10000000;
+		if(INITRND == -1)
+			INITRND = 0;
+		break;
+	case 6:	/* headerless */
+		HEADR = 0;
+		if(INITTEXT == -1)
+			INITTEXT = 0x80000000L+HEADR;
+		if(INITDAT == -1)
+			INITDAT = 0;
+		if(INITRND == -1)
+			INITRND = 4096;
+		break;
+	}
+	if(INITDAT != 0 && INITRND != 0)
+		print("warning: -D0x%lux is ignored because of -R0x%lux\n",
+			INITDAT, INITRND);
+	if(debug['v'])
+		Bprint(&bso, "HEADER = -H0x%d -T0x%lux -D0x%lux -R0x%lux\n",
+			HEADTYPE, INITTEXT, INITDAT, INITRND);
+	Bflush(&bso);
+	zprg.as = AGOK;
+	zprg.reg = NREG;
+	zprg.from.name = D_NONE;
+	zprg.from.type = D_NONE;
+	zprg.from.reg = NREG;
+	zprg.to = zprg.from;
+	buildop();
+	histgen = 0;
+	textp = P;
+	datap = P;
+	pc = 0;
+	dtype = 4;
+	if(outfile == 0) {
+		static char name[20];
+
+		snprint(name, sizeof name, "%c.out", thechar);
+		outfile = name;
+	}
+	cout = create(outfile, 1, 0775);
+	if(cout < 0) {
+		diag("%s: cannot create", outfile);
+		errorexit();
+	}
+	nuxiinit();
+
+	version = 0;
+	cbp = buf.cbuf;
+	cbc = sizeof(buf.cbuf);
+	firstp = prg();
+	lastp = firstp;
+
+	if(INITENTRY == 0) {
+		INITENTRY = "_main";
+		if(debug['p'])
+			INITENTRY = "_mainp";
+		if(!debug['l'])
+			lookup(INITENTRY, 0)->type = SXREF;
+	} else
+		lookup(INITENTRY, 0)->type = SXREF;
+
+	while(*argv)
+		objfile(*argv++);
+	if(!debug['l'])
+		loadlib();
+	firstp = firstp->link;
+	if(firstp == P)
+		goto out;
+	patch();
+	if(debug['p'])
+		if(debug['1'])
+			doprof1();
+		else
+			doprof2();
+	dodata();
+	follow();
+	if(firstp == P)
+		goto out;
+	noops();
+	span();
+	asmb();
+	undef();
+
+out:
+	if(debug['v']) {
+		Bprint(&bso, "%5.2f cpu time\n", cputime());
+		Bprint(&bso, "%ld memory used\n", thunk);
+		Bprint(&bso, "%d sizeof adr\n", sizeof(Adr));
+		Bprint(&bso, "%d sizeof prog\n", sizeof(Prog));
+	}
+	Bflush(&bso);
+	errorexit();
+}
+
+void
+loadlib(void)
+{
+	int i;
+	long h;
+	Sym *s;
+
+loop:
+	xrefresolv = 0;
+	for(i=0; i<libraryp; i++) {
+		if(debug['v'])
+			Bprint(&bso, "%5.2f autolib: %s (from %s)\n", cputime(), library[i], libraryobj[i]);
+		objfile(library[i]);
+	}
+	if(xrefresolv)
+	for(h=0; h<nelem(hash); h++)
+	for(s = hash[h]; s != S; s = s->link)
+		if(s->type == SXREF)
+			goto loop;
+}
+
+void
+errorexit(void)
+{
+
+	if(nerrors) {
+		if(cout >= 0)
+			remove(outfile);
+		exits("error");
+	}
+	exits(0);
+}
+
+void
+objfile(char *file)
+{
+	long off, esym, cnt, l;
+	int f, work;
+	Sym *s;
+	char magbuf[SARMAG];
+	char name[100], pname[150];
+	struct ar_hdr arhdr;
+	char *e, *start, *stop;
+
+	if(file[0] == '-' && file[1] == 'l') {
+		if(debug['9'])
+			sprint(name, "/%s/lib/lib", thestring);
+		else
+			sprint(name, "/usr/%clib/lib", thechar);
+		strcat(name, file+2);
+		strcat(name, ".a");
+		file = name;
+	}
+	if(debug['v'])
+		Bprint(&bso, "%5.2f ldobj: %s\n", cputime(), file);
+	Bflush(&bso);
+	f = open(file, 0);
+	if(f < 0) {
+		diag("cannot open file: %s", file);
+		errorexit();
+	}
+	l = read(f, magbuf, SARMAG);
+	if(l != SARMAG || strncmp(magbuf, ARMAG, SARMAG)){
+		/* load it as a regular file */
+		l = seek(f, 0L, 2);
+		seek(f, 0L, 0);
+		ldobj(f, l, file);
+		close(f);
+		return;
+	}
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f ldlib: %s\n", cputime(), file);
+	l = read(f, &arhdr, SAR_HDR);
+	if(l != SAR_HDR) {
+		diag("%s: short read on archive file symbol header", file);
+		goto out;
+	}
+	if(strncmp(arhdr.name, symname, strlen(symname))) {
+		diag("%s: first entry not symbol header", file);
+		goto out;
+	}
+
+	esym = SARMAG + SAR_HDR + atolwhex(arhdr.size);
+	off = SARMAG + SAR_HDR;
+
+	/*
+	 * just bang the whole symbol file into memory
+	 */
+	seek(f, off, 0);
+	cnt = esym - off;
+	start = malloc(cnt + 10);
+	cnt = read(f, start, cnt);
+	if(cnt <= 0){
+		close(f);
+		return;
+	}
+	stop = &start[cnt];
+	memset(stop, 0, 10);
+
+	work = 1;
+	while(work){
+		if(debug['v'])
+			Bprint(&bso, "%5.2f library pass: %s\n", cputime(), file);
+		Bflush(&bso);
+		work = 0;
+		for(e = start; e < stop; e = strchr(e+5, 0) + 1) {
+			s = lookup(e+5, 0);
+			if(s->type != SXREF)
+				continue;
+			sprint(pname, "%s(%s)", file, s->name);
+			if(debug['v'])
+				Bprint(&bso, "%5.2f library: %s\n", cputime(), pname);
+			Bflush(&bso);
+			l = e[1] & 0xff;
+			l |= (e[2] & 0xff) << 8;
+			l |= (e[3] & 0xff) << 16;
+			l |= (e[4] & 0xff) << 24;
+			seek(f, l, 0);
+			l = read(f, &arhdr, SAR_HDR);
+			if(l != SAR_HDR)
+				goto bad;
+			if(strncmp(arhdr.fmag, ARFMAG, sizeof(arhdr.fmag)))
+				goto bad;
+			l = atolwhex(arhdr.size);
+			ldobj(f, l, pname);
+			if(s->type == SXREF) {
+				diag("%s: failed to load: %s", file, s->name);
+				errorexit();
+			}
+			work = 1;
+			xrefresolv = 1;
+		}
+	}
+	return;
+
+bad:
+	diag("%s: bad or out of date archive", file);
+out:
+	close(f);
+}
+
+int
+zaddr(uchar *p, Adr *a, Sym *h[])
+{
+	int i, c;
+	long l;
+	Sym *s;
+	Auto *u;
+
+	c = p[2];
+	if(c < 0 || c > NSYM){
+		print("sym out of range: %d\n", c);
+		p[0] = ALAST+1;
+		return 0;
+	}
+	a->type = p[0];
+	a->reg = p[1];
+	a->sym = h[c];
+	a->name = p[3];
+	c = 4;
+
+	if(a->reg < 0 || a->reg > NREG) {
+		print("register out of range %d\n", a->reg);
+		p[0] = ALAST+1;
+		return 0;	/*  force real diagnostic */
+	}
+
+	switch(a->type) {
+	default:
+		print("unknown type %d\n", a->type);
+		p[0] = ALAST+1;
+		return 0;	/*  force real diagnostic */
+
+	case D_NONE:
+	case D_REG:
+	case D_FREG:
+	case D_MREG:
+	case D_FCREG:
+	case D_LO:
+	case D_HI:
+		break;
+
+	case D_BRANCH:
+	case D_OREG:
+	case D_CONST:
+	case D_OCONST:
+		a->offset = p[4] | (p[5]<<8) |
+			(p[6]<<16) | (p[7]<<24);
+		c += 4;
+		break;
+
+	case D_SCONST:
+		while(nhunk < NSNAME)
+			gethunk();
+		a->sval = (char*)hunk;
+		nhunk -= NSNAME;
+		hunk += NSNAME;
+
+		memmove(a->sval, p+4, NSNAME);
+		c += NSNAME;
+		break;
+
+	case D_FCONST:
+		while(nhunk < sizeof(Ieee))
+			gethunk();
+		a->ieee = (Ieee*)hunk;
+		nhunk -= NSNAME;
+		hunk += NSNAME;
+
+		a->ieee->l = p[4] | (p[5]<<8) |
+			(p[6]<<16) | (p[7]<<24);
+		a->ieee->h = p[8] | (p[9]<<8) |
+			(p[10]<<16) | (p[11]<<24);
+		c += 8;
+		break;
+	}
+	s = a->sym;
+	if(s == S)
+		return c;
+	i = a->name;
+	if(i != D_AUTO && i != D_PARAM)
+		return c;
+
+	l = a->offset;
+	for(u=curauto; u; u=u->link)
+		if(u->asym == s)
+		if(u->type == i) {
+			if(u->aoffset > l)
+				u->aoffset = l;
+			return c;
+		}
+
+	while(nhunk < sizeof(Auto))
+		gethunk();
+	u = (Auto*)hunk;
+	nhunk -= sizeof(Auto);
+	hunk += sizeof(Auto);
+
+	u->link = curauto;
+	curauto = u;
+	u->asym = s;
+	u->aoffset = l;
+	u->type = i;
+	return c;
+}
+
+void
+addlib(char *obj)
+{
+	char name[1024], comp[256], *p;
+	int i;
+
+	if(histfrogp <= 0)
+		return;
+
+	if(histfrog[0]->name[1] == '/') {
+		sprint(name, "");
+		i = 1;
+	} else
+	if(histfrog[0]->name[1] == '.') {
+		sprint(name, ".");
+		i = 0;
+	} else {
+		if(debug['9'])
+			sprint(name, "/%s/lib", thestring);
+		else
+			sprint(name, "/usr/%clib", thechar);
+		i = 0;
+	}
+
+	for(; i<histfrogp; i++) {
+		snprint(comp, sizeof comp, histfrog[i]->name+1);
+		for(;;) {
+			p = strstr(comp, "$O");
+			if(p == 0)
+				break;
+			memmove(p+1, p+2, strlen(p+2)+1);
+			p[0] = thechar;
+		}
+		for(;;) {
+			p = strstr(comp, "$M");
+			if(p == 0)
+				break;
+			if(strlen(comp)+strlen(thestring)-2+1 >= sizeof comp) {
+				diag("library component too long");
+				return;
+			}
+			memmove(p+strlen(thestring), p+2, strlen(p+2)+1);
+			memmove(p, thestring, strlen(thestring));
+		}
+		if(strlen(name) + strlen(comp) + 3 >= sizeof(name)) {
+			diag("library component too long");
+			return;
+		}
+		strcat(name, "/");
+		strcat(name, comp);
+	}
+	for(i=0; i<libraryp; i++)
+		if(strcmp(name, library[i]) == 0)
+			return;
+	if(libraryp == nelem(library)){
+		diag("too many autolibs; skipping %s", name);
+		return;
+	}
+
+	p = malloc(strlen(name) + 1);
+	strcpy(p, name);
+	library[libraryp] = p;
+	p = malloc(strlen(obj) + 1);
+	strcpy(p, obj);
+	libraryobj[libraryp] = p;
+	libraryp++;
+}
+
+void
+addhist(long line, int type)
+{
+	Auto *u;
+	Sym *s;
+	int i, j, k;
+
+	u = malloc(sizeof(Auto));
+	s = malloc(sizeof(Sym));
+	s->name = malloc(2*(histfrogp+1) + 1);
+
+	u->asym = s;
+	u->type = type;
+	u->aoffset = line;
+	u->link = curhist;
+	curhist = u;
+
+	j = 1;
+	for(i=0; i<histfrogp; i++) {
+		k = histfrog[i]->value;
+		s->name[j+0] = k>>8;
+		s->name[j+1] = k;
+		j += 2;
+	}
+}
+
+void
+histtoauto(void)
+{
+	Auto *l;
+
+	while(l = curhist) {
+		curhist = l->link;
+		l->link = curauto;
+		curauto = l;
+	}
+}
+
+void
+collapsefrog(Sym *s)
+{
+	int i;
+
+	/*
+	 * bad encoding of path components only allows
+	 * MAXHIST components. if there is an overflow,
+	 * first try to collapse xxx/..
+	 */
+	for(i=1; i<histfrogp; i++)
+		if(strcmp(histfrog[i]->name+1, "..") == 0) {
+			memmove(histfrog+i-1, histfrog+i+1,
+				(histfrogp-i-1)*sizeof(histfrog[0]));
+			histfrogp--;
+			goto out;
+		}
+
+	/*
+	 * next try to collapse .
+	 */
+	for(i=0; i<histfrogp; i++)
+		if(strcmp(histfrog[i]->name+1, ".") == 0) {
+			memmove(histfrog+i, histfrog+i+1,
+				(histfrogp-i-1)*sizeof(histfrog[0]));
+			goto out;
+		}
+
+	/*
+	 * last chance, just truncate from front
+	 */
+	memmove(histfrog+0, histfrog+1,
+		(histfrogp-1)*sizeof(histfrog[0]));
+
+out:
+	histfrog[histfrogp-1] = s;
+}
+
+void
+nopout(Prog *p)
+{
+	p->as = ANOP;
+	p->from.type = D_NONE;
+	p->to.type = D_NONE;
+}
+
+uchar*
+readsome(int f, uchar *buf, uchar *good, uchar *stop, int max)
+{
+	int n;
+
+	n = stop - good;
+	memmove(buf, good, stop - good);
+	stop = buf + n;
+	n = MAXIO - n;
+	if(n > max)
+		n = max;
+	n = read(f, stop, n);
+	if(n <= 0)
+		return 0;
+	return stop + n;
+}
+
+void
+ldobj(int f, long c, char *pn)
+{
+	long ipc;
+	Prog *p, *t;
+	uchar *bloc, *bsize, *stop;
+	Sym *h[NSYM], *s, *di;
+	int v, o, r, skip;
+
+	bsize = buf.xbuf;
+	bloc = buf.xbuf;
+	di = S;
+
+newloop:
+	memset(h, 0, sizeof(h));
+	version++;
+	histfrogp = 0;
+	ipc = pc;
+	skip = 0;
+
+loop:
+	if(c <= 0)
+		goto eof;
+	r = bsize - bloc;
+	if(r < 100 && r < c) {		/* enough for largest prog */
+		bsize = readsome(f, buf.xbuf, bloc, bsize, c);
+		if(bsize == 0)
+			goto eof;
+		bloc = buf.xbuf;
+		goto loop;
+	}
+	o = bloc[0];		/* as */
+	if(o <= AXXX || o >= ALAST) {
+		diag("%s: line %ld: opcode out of range %d", pn, pc-ipc, o);
+		print("	probably not a .%c file\n", thechar);
+		errorexit();
+	}
+	if(o == ANAME || o == ASIGNAME) {
+		if(o == ASIGNAME) {
+			bloc += 4;
+			c -= 4;
+		}
+		stop = memchr(&bloc[3], 0, bsize-&bloc[3]);
+		if(stop == 0){
+			bsize = readsome(f, buf.xbuf, bloc, bsize, c);
+			if(bsize == 0)
+				goto eof;
+			bloc = buf.xbuf;
+			stop = memchr(&bloc[3], 0, bsize-&bloc[3]);
+			if(stop == 0){
+				fprint(2, "%s: name too long\n", pn);
+				errorexit();
+			}
+		}
+		v = bloc[1];	/* type */
+		o = bloc[2];	/* sym */
+		bloc += 3;
+		c -= 3;
+
+		r = 0;
+		if(v == D_STATIC)
+			r = version;
+		s = lookup((char*)bloc, r);
+		c -= &stop[1] - bloc;
+		bloc = stop + 1;
+
+		if(debug['W'])
+			print("	ANAME	%s\n", s->name);
+		h[o] = s;
+		if((v == D_EXTERN || v == D_STATIC) && s->type == 0)
+			s->type = SXREF;
+		if(v == D_FILE) {
+			if(s->type != SFILE) {
+				histgen++;
+				s->type = SFILE;
+				s->value = histgen;
+			}
+			if(histfrogp < MAXHIST) {
+				histfrog[histfrogp] = s;
+				histfrogp++;
+			} else
+				collapsefrog(s);
+		}
+		goto loop;
+	}
+
+	if(nhunk < sizeof(Prog))
+		gethunk();
+	p = (Prog*)hunk;
+	nhunk -= sizeof(Prog);
+	hunk += sizeof(Prog);
+
+	p->as = o;
+	p->reg = bloc[1] & 0x7f;
+	if(bloc[1] & 0x80)
+		p->mark = NOSCHED;
+	p->line = bloc[2] | (bloc[3]<<8) | (bloc[4]<<16) | (bloc[5]<<24);
+
+	r = zaddr(bloc+6, &p->from, h) + 6;
+	r += zaddr(bloc+r, &p->to, h);
+	bloc += r;
+	c -= r;
+
+	if(p->reg < 0 || p->reg > NREG)
+		diag("register out of range %d", p->reg);
+
+	p->link = P;
+	p->cond = P;
+
+	if(debug['W'])
+		print("%P\n", p);
+
+	switch(o) {
+	case AHISTORY:
+		if(p->to.offset == -1) {
+			addlib(pn);
+			histfrogp = 0;
+			goto loop;
+		}
+		addhist(p->line, D_FILE);		/* 'z' */
+		if(p->to.offset)
+			addhist(p->to.offset, D_FILE1);	/* 'Z' */
+		histfrogp = 0;
+		goto loop;
+
+	case AEND:
+		histtoauto();
+		if(curtext != P)
+			curtext->to.autom = curauto;
+		curauto = 0;
+		curtext = P;
+		if(c)
+			goto newloop;
+		return;
+
+	case AGLOBL:
+		s = p->from.sym;
+		if(s == S) {
+			diag("GLOBL must have a name\n%P", p);
+			errorexit();
+		}
+		if(s->type == 0 || s->type == SXREF) {
+			s->type = SBSS;
+			s->value = 0;
+		}
+		if(s->type != SBSS) {
+			diag("redefinition: %s\n%P", s->name, p);
+			s->type = SBSS;
+			s->value = 0;
+		}
+		if(p->to.offset > s->value)
+			s->value = p->to.offset;
+		break;
+
+	case ADYNT:
+		if(p->to.sym == S) {
+			diag("DYNT without a sym\n%P", p);
+			break;
+		}
+		di = p->to.sym;
+		p->reg = 4;
+		if(di->type == SXREF) {
+			if(debug['z'])
+				Bprint(&bso, "%P set to %d\n", p, dtype);
+			di->type = SCONST;
+			di->value = dtype;
+			dtype += 4;
+		}
+		if(p->from.sym == S)
+			break;
+
+		p->from.offset = di->value;
+		p->from.sym->type = SDATA;
+		if(curtext == P) {
+			diag("DYNT not in text: %P", p);
+			break;
+		}
+		p->to.sym = curtext->from.sym;
+		p->to.type = D_CONST;
+		p->link = datap;
+		datap = p;
+		break;
+
+	case AINIT:
+		if(p->from.sym == S) {
+			diag("INIT without a sym\n%P", p);
+			break;
+		}
+		if(di == S) {
+			diag("INIT without previous DYNT\n%P", p);
+			break;
+		}
+		p->from.offset = di->value;
+		p->from.sym->type = SDATA;
+		p->link = datap;
+		datap = p;
+		break;
+	
+	case ADATA:
+		if(p->from.sym == S) {
+			diag("DATA without a sym\n%P", p);
+			break;
+		}
+		p->link = datap;
+		datap = p;
+		break;
+
+	case AGOK:
+		diag("unknown opcode\n%P", p);
+		p->pc = pc;
+		pc++;
+		break;
+
+	case ATEXT:
+		if(curtext != P) {
+			histtoauto();
+			curtext->to.autom = curauto;
+			curauto = 0;
+		}
+		skip = 0;
+		curtext = p;
+		autosize = (p->to.offset+3L) & ~3L;
+		p->to.offset = autosize;
+		autosize += 4;
+		s = p->from.sym;
+		if(s == S) {
+			diag("TEXT must have a name\n%P", p);
+			errorexit();
+		}
+		if(s->type != 0 && s->type != SXREF) {
+			if(p->reg & DUPOK) {
+				skip = 1;
+				goto casedef;
+			}
+			diag("redefinition: %s\n%P", s->name, p);
+		}
+		s->type = STEXT;
+		s->value = pc;
+		lastp->link = p;
+		lastp = p;
+		p->pc = pc;
+		pc++;
+		if(textp == P) {
+			textp = p;
+			etextp = p;
+			goto loop;
+		}
+		etextp->cond = p;
+		etextp = p;
+		break;
+
+	case ASUB:
+	case ASUBU:
+		if(p->from.type == D_CONST)
+		if(p->from.name == D_NONE) {
+			p->from.offset = -p->from.offset;
+			if(p->as == ASUB)
+				p->as = AADD;
+			else
+				p->as = AADDU;
+		}
+		goto casedef;
+
+	case AMOVF:
+		if(skip)
+			goto casedef;
+
+		if(p->from.type == D_FCONST) {
+			/* size sb 9 max */
+			sprint(literal, "$%lux", ieeedtof(p->from.ieee));
+			s = lookup(literal, 0);
+			if(s->type == 0) {
+				s->type = SBSS;
+				s->value = 4;
+				t = prg();
+				t->as = ADATA;
+				t->line = p->line;
+				t->from.type = D_OREG;
+				t->from.sym = s;
+				t->from.name = D_EXTERN;
+				t->reg = 4;
+				t->to = p->from;
+				t->link = datap;
+				datap = t;
+			}
+			p->from.type = D_OREG;
+			p->from.sym = s;
+			p->from.name = D_EXTERN;
+			p->from.offset = 0;
+		}
+		goto casedef;
+
+	case AMOVD:
+		if(skip)
+			goto casedef;
+
+		if(p->from.type == D_FCONST) {
+			/* size sb 18 max */
+			sprint(literal, "$%lux.%lux",
+				p->from.ieee->l, p->from.ieee->h);
+			s = lookup(literal, 0);
+			if(s->type == 0) {
+				s->type = SBSS;
+				s->value = 8;
+				t = prg();
+				t->as = ADATA;
+				t->line = p->line;
+				t->from.type = D_OREG;
+				t->from.sym = s;
+				t->from.name = D_EXTERN;
+				t->reg = 8;
+				t->to = p->from;
+				t->link = datap;
+				datap = t;
+			}
+			p->from.type = D_OREG;
+			p->from.sym = s;
+			p->from.name = D_EXTERN;
+			p->from.offset = 0;
+		}
+		goto casedef;
+
+	default:
+	casedef:
+		if(skip)
+			nopout(p);
+
+		if(p->to.type == D_BRANCH)
+			p->to.offset += ipc;
+		lastp->link = p;
+		lastp = p;
+		p->pc = pc;
+		pc++;
+		break;
+	}
+	goto loop;
+
+eof:
+	diag("truncated object file: %s", pn);
+}
+
+Sym*
+lookup(char *symb, int v)
+{
+	Sym *s;
+	char *p;
+	long h;
+	int c, l;
+
+	h = v;
+	for(p=symb; c = *p; p++)
+		h = h+h+h + c;
+	l = (p - symb) + 1;
+	if(h < 0)
+		h = ~h;
+	h %= NHASH;
+	for(s = hash[h]; s != S; s = s->link)
+		if(s->version == v)
+		if(memcmp(s->name, symb, l) == 0)
+			return s;
+
+	while(nhunk < sizeof(Sym))
+		gethunk();
+	s = (Sym*)hunk;
+	nhunk -= sizeof(Sym);
+	hunk += sizeof(Sym);
+
+	s->name = malloc(l);
+	memmove(s->name, symb, l);
+
+	s->link = hash[h];
+	s->type = 0;
+	s->version = v;
+	s->value = 0;
+	hash[h] = s;
+	return s;
+}
+
+Prog*
+prg(void)
+{
+	Prog *p;
+
+	while(nhunk < sizeof(Prog))
+		gethunk();
+	p = (Prog*)hunk;
+	nhunk -= sizeof(Prog);
+	hunk += sizeof(Prog);
+
+	*p = zprg;
+	return p;
+}
+
+void
+gethunk(void)
+{
+	char *h;
+	long nh;
+
+	nh = NHUNK;
+	if(thunk >= 5L*NHUNK) {
+		nh = 5L*NHUNK;
+		if(thunk >= 25L*NHUNK)
+			nh = 25L*NHUNK;
+	}
+	h = mysbrk(nh);
+	if(h == (char*)-1) {
+		diag("out of memory");
+		errorexit();
+	}
+	hunk = h;
+	nhunk = nh;
+	thunk += nh;
+}
+
+void
+doprof1(void)
+{
+	Sym *s;
+	long n;
+	Prog *p, *q;
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f profile 1\n", cputime());
+	Bflush(&bso);
+	s = lookup("__mcount", 0);
+	n = 1;
+	for(p = firstp->link; p != P; p = p->link) {
+		if(p->as == ATEXT) {
+			q = prg();
+			q->line = p->line;
+			q->link = datap;
+			datap = q;
+			q->as = ADATA;
+			q->from.type = D_OREG;
+			q->from.name = D_EXTERN;
+			q->from.offset = n*4;
+			q->from.sym = s;
+			q->reg = 4;
+			q->to = p->from;
+			q->to.type = D_CONST;
+
+			q = prg();
+			q->line = p->line;
+			q->pc = p->pc;
+			q->link = p->link;
+			p->link = q;
+			p = q;
+			p->as = AMOVW;
+			p->from.type = D_OREG;
+			p->from.name = D_EXTERN;
+			p->from.sym = s;
+			p->from.offset = n*4 + 4;
+			p->to.type = D_REG;
+			p->to.reg = REGTMP;
+
+			q = prg();
+			q->line = p->line;
+			q->pc = p->pc;
+			q->link = p->link;
+			p->link = q;
+			p = q;
+			p->as = AADDU;
+			p->from.type = D_CONST;
+			p->from.offset = 1;
+			p->to.type = D_REG;
+			p->to.reg = REGTMP;
+
+			q = prg();
+			q->line = p->line;
+			q->pc = p->pc;
+			q->link = p->link;
+			p->link = q;
+			p = q;
+			p->as = AMOVW;
+			p->from.type = D_REG;
+			p->from.reg = REGTMP;
+			p->to.type = D_OREG;
+			p->to.name = D_EXTERN;
+			p->to.sym = s;
+			p->to.offset = n*4 + 4;
+
+			n += 2;
+			continue;
+		}
+	}
+	q = prg();
+	q->line = 0;
+	q->link = datap;
+	datap = q;
+
+	q->as = ADATA;
+	q->from.type = D_OREG;
+	q->from.name = D_EXTERN;
+	q->from.sym = s;
+	q->reg = 4;
+	q->to.type = D_CONST;
+	q->to.offset = n;
+
+	s->type = SBSS;
+	s->value = n*4;
+}
+
+void
+doprof2(void)
+{
+	Sym *s2, *s4;
+	Prog *p, *q, *q2, *ps2, *ps4;
+
+	if(debug['v'])
+		Bprint(&bso, "%5.2f profile 2\n", cputime());
+	Bflush(&bso);
+
+	if(debug['e']){
+		s2 = lookup("_tracein", 0);
+		s4 = lookup("_traceout", 0);
+	}else{
+		s2 = lookup("_profin", 0);
+		s4 = lookup("_profout", 0);
+	}
+	if(s2->type != STEXT || s4->type != STEXT) {
+		if(debug['e'])
+			diag("_tracein/_traceout not defined %d %d", s2->type, s4->type);
+		else
+			diag("_profin/_profout not defined");
+		return;
+	}
+
+	ps2 = P;
+	ps4 = P;
+	for(p = firstp; p != P; p = p->link) {
+		if(p->as == ATEXT) {
+			if(p->from.sym == s2) {
+				ps2 = p;
+				p->reg = 1;
+			}
+			if(p->from.sym == s4) {
+				ps4 = p;
+				p->reg = 1;
+			}
+		}
+	}
+	for(p = firstp; p != P; p = p->link) {
+		if(p->as == ATEXT) {
+			if(p->reg & NOPROF) {
+				for(;;) {
+					q = p->link;
+					if(q == P)
+						break;
+					if(q->as == ATEXT)
+						break;
+					p = q;
+				}
+				continue;
+			}
+
+			/*
+			 * JAL	profin, R2
+			 */
+			q = prg();
+			q->line = p->line;
+			q->pc = p->pc;
+			q->link = p->link;
+			if(debug['e']){		/* embedded tracing */
+				q2 = prg();
+				p->link = q2;
+				q2->link = q;
+
+				q2->line = p->line;
+				q2->pc = p->pc;
+
+				q2->as = AJMP;
+				q2->to.type = D_BRANCH;
+				q2->to.sym = p->to.sym;
+				q2->cond = q->link;
+			}else
+				p->link = q;
+			p = q;
+			p->as = AJAL;
+			p->to.type = D_BRANCH;
+			p->cond = ps2;
+			p->to.sym = s2;
+
+			continue;
+		}
+		if(p->as == ARET) {
+			/*
+			 * RET (default)
+			 */
+			if(debug['e']){		/* embedded tracing */
+				q = prg();
+				q->line = p->line;
+				q->pc = p->pc;
+				q->link = p->link;
+				p->link = q;
+				p = q;
+			}
+			/*
+			 * RET
+			 */
+			q = prg();
+			q->as = ARET;
+			q->from = p->from;
+			q->to = p->to;
+			q->link = p->link;
+			p->link = q;
+
+			/*
+			 * JAL	profout
+			 */
+			p->as = AJAL;
+			p->from = zprg.from;
+			p->to = zprg.to;
+			p->to.type = D_BRANCH;
+			p->cond = ps4;
+			p->to.sym = s4;
+
+			p = q;
+
+			continue;
+		}
+	}
+}
+
+void
+nuxiinit(void)
+{
+	int i, c;
+
+	for(i=0; i<4; i++)
+		if (!little) {			/* normal big-endian case */
+			c = find1(0x01020304L, i+1);
+			if(i >= 2)
+				inuxi2[i-2] = c;
+			if(i >= 3)
+				inuxi1[i-3] = c;
+			inuxi4[i] = c;
+			fnuxi8[i] = c+4;
+			fnuxi8[i+4] = c;
+		} else {			/* oddball little-endian case */
+			c = find1(0x04030201L, i+1);
+			if(i < 2)
+				inuxi2[i] = c;
+			if(i < 1)
+				inuxi1[i] = c;
+			inuxi4[i] = c;
+			fnuxi4[i] = c;
+			fnuxi8[i] = c;
+			fnuxi8[i+4] = c+4;
+		}
+	if(debug['v']) {
+		Bprint(&bso, "inuxi = ");
+		for(i=0; i<1; i++)
+			Bprint(&bso, "%d", inuxi1[i]);
+		Bprint(&bso, " ");
+		for(i=0; i<2; i++)
+			Bprint(&bso, "%d", inuxi2[i]);
+		Bprint(&bso, " ");
+		for(i=0; i<4; i++)
+			Bprint(&bso, "%d", inuxi4[i]);
+		Bprint(&bso, "\nfnuxi = ");
+		for(i=0; i<8; i++)
+			Bprint(&bso, "%d", fnuxi8[i]);
+		Bprint(&bso, "\n");
+	}
+	Bflush(&bso);
+}
+
+find1(long l, int c)
+{
+	char *p;
+	int i;
+
+	p = (char*)&l;
+	for(i=0; i<4; i++)
+		if(*p++ == c)
+			return i;
+	return 0;
+}
+
+long
+ieeedtof(Ieee *ieeep)
+{
+	int exp;
+	long v;
+
+	if(ieeep->h == 0)
+		return 0;
+	exp = (ieeep->h>>20) & ((1L<<11)-1L);
+	exp -= (1L<<10) - 2L;
+	v = (ieeep->h & 0xfffffL) << 3;
+	v |= (ieeep->l >> 29) & 0x7L;
+	if((ieeep->l >> 28) & 1) {
+		v++;
+		if(v & 0x800000L) {
+			v = (v & 0x7fffffL) >> 1;
+			exp++;
+		}
+	}
+	if(exp <= -126 || exp >= 130)
+		diag("double fp to single fp overflow");
+	v |= ((exp + 126) & 0xffL) << 23;
+	v |= ieeep->h & 0x80000000L;
+	return v;
+}
+
+double
+ieeedtod(Ieee *ieeep)
+{
+	Ieee e;
+	double fr;
+	int exp;
+
+	if(ieeep->h & (1L<<31)) {
+		e.h = ieeep->h & ~(1L<<31);
+		e.l = ieeep->l;
+		return -ieeedtod(&e);
+	}
+	if(ieeep->l == 0 && ieeep->h == 0)
+		return 0;
+	fr = ieeep->l & ((1L<<16)-1L);
+	fr /= 1L<<16;
+	fr += (ieeep->l>>16) & ((1L<<16)-1L);
+	fr /= 1L<<16;
+	fr += (ieeep->h & (1L<<20)-1L) | (1L<<20);
+	fr /= 1L<<21;
+	exp = (ieeep->h>>20) & ((1L<<11)-1L);
+	exp -= (1L<<10) - 2L;
+	return ldexp(fr, exp);
+}