src/cmd/6l/obj.c - go - Git at Google

 // Inferno utils/6l/obj.c
 // http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.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.

 #define	EXTERN
 #include	"l.h"
 #include	"../ld/lib.h"
 #include	"../ld/elf.h"
 #include	"../ld/macho.h"
 #include	<ar.h>

 char	*noname		= "<none>";
 char	thechar		= '6';
 char*	thestring 	= "amd64";
 char*	paramspace	= "FP";

 /*
  *	-H2 -T4136 -R4096		is plan9 64-bit format
  *	-H3 -T4128 -R4096		is plan9 32-bit format
  *	-H5 -T0x80110000 -R4096		is ELF32
  *	-H6 -Tx -Rx			is apple MH-exec
  *	-H7 -Tx -Rx			is linux elf-exec
  *      -H9 -Tx -Rx			is FreeBSD elf-exec
  *
  *	options used: 189BLQSWabcjlnpsvz
  */

 static int
 isobjfile(char *f)
 {
 	int n, v;
 	Biobuf *b;
 	char buf1[5], buf2[SARMAG];

 	b = Bopen(f, OREAD);
 	if(b == nil)
 		return 0;
 	n = Bread(b, buf1, 5);
 	if(n == 5 && (buf1[2] == 1 && buf1[3] == '<' || buf1[3] == 1 && buf1[4] == '<'))
 		v = 1;	/* good enough for our purposes */
 	else {
 		Bseek(b, 0, 0);
 		n = Bread(b, buf2, SARMAG);
 		v = n == SARMAG && strncmp(buf2, ARMAG, SARMAG) == 0;
 	}
 	Bterm(b);
 	return v;
 }

 void
 usage(void)
 {
 	fprint(2, "usage: 6l [-options] [-E entry] [-H head] [-L dir] [-T text] [-R rnd] [-o out] files...\n");
 	exits("usage");
 }

 void
 main(int argc, char *argv[])
 {
 	int i, c;

 	Binit(&bso, 1, OWRITE);
 	cout = -1;
 	listinit();
 	memset(debug, 0, sizeof(debug));
 	nerrors = 0;
 	outfile = "6.out";
 	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': /* output to (next arg) */
 		outfile = EARGF(usage());
 		break;
 	case 'E':
 		INITENTRY = EARGF(usage());
 		break;
 	case 'H':
 		HEADTYPE = atolwhex(EARGF(usage()));
 		break;
 	case 'L':
 		Lflag(EARGF(usage()));
 		break;
 	case 'T':
 		INITTEXT = atolwhex(EARGF(usage()));
 		break;
 	case 'D':
 		INITDAT = atolwhex(EARGF(usage()));
 		break;
 	case 'R':
 		INITRND = atolwhex(EARGF(usage()));
 		break;
 	case 'x':	/* produce export table */
 		doexp = 1;
 		if(argv[1] != nil && argv[1][0] != '-' && !isobjfile(argv[1]))
 			readundefs(ARGF(), SEXPORT);
 		break;
 	case 'u':	/* produce dynamically loadable module */
 		dlm = 1;
 		debug['l']++;
 		if(argv[1] != nil && argv[1][0] != '-' && !isobjfile(argv[1]))
 			readundefs(ARGF(), SIMPORT);
 		break;
 	} ARGEND
 	USED(argc);
 	if(*argv == 0)
 		usage();

 	libinit();

 	if(HEADTYPE == -1) {
 		HEADTYPE = 2;
 		if(strcmp(goos, "linux") == 0)
 			HEADTYPE = 7;
 		else
 		if(strcmp(goos, "darwin") == 0)
 			HEADTYPE = 6;
 		else
 		if(strcmp(goos, "freebsd") == 0)
 			HEADTYPE = 9;
 		else
 			print("goos is not known: %s\n", goos);
 	}

 	switch(HEADTYPE) {
 	default:
 		diag("unknown -H option");
 		errorexit();
 	case 2:	/* plan 9 */
 		HEADR = 32L+8L;
 		if(INITTEXT == -1)
 			INITTEXT = 4096+HEADR;
 		if(INITDAT == -1)
 			INITDAT = 0;
 		if(INITRND == -1)
 			INITRND = 4096;
 		break;
 	case 3:	/* plan 9 */
 		HEADR = 32L;
 		if(INITTEXT == -1)
 			INITTEXT = 4096+32;
 		if(INITDAT == -1)
 			INITDAT = 0;
 		if(INITRND == -1)
 			INITRND = 4096;
 		break;
 	case 5:	/* elf32 executable */
 		HEADR = rnd(52L+3*32L, 16);
 		if(INITTEXT == -1)
 			INITTEXT = 0x80110000L;
 		if(INITDAT == -1)
 			INITDAT = 0;
 		if(INITRND == -1)
 			INITRND = 4096;
 		break;
 	case 6:	/* apple MACH */
 		machoinit();
 		HEADR = MACHORESERVE;
 		if(INITRND == -1)
 			INITRND = 4096;
 		if(INITTEXT == -1)
 			INITTEXT = 4096+HEADR;
 		if(INITDAT == -1)
 			INITDAT = 0;
 		break;
 	case 7:	/* elf64 executable */
 	case 9: /* freebsd */
 		elfinit();
 		HEADR = ELFRESERVE;
 		if(INITTEXT == -1)
 			INITTEXT = (1<<22)+HEADR;
 		if(INITDAT == -1)
 			INITDAT = 0;
 		if(INITRND == -1)
 			INITRND = 4096;
 		break;
 	}
 	if(INITDAT != 0 && INITRND != 0)
 		print("warning: -D0x%llux is ignored because of -R0x%lux\n",
 			INITDAT, INITRND);
 	if(debug['v'])
 		Bprint(&bso, "HEADER = -H%ld -T0x%llux -D0x%llux -R0x%lux\n",
 			HEADTYPE, INITTEXT, INITDAT, INITRND);
 	Bflush(&bso);
 	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;
 	}

 	zprg.link = P;
 	zprg.pcond = P;
 	zprg.back = 2;
 	zprg.as = AGOK;
 	zprg.from.type = D_NONE;
 	zprg.from.index = D_NONE;
 	zprg.from.scale = 1;
 	zprg.to = zprg.from;
 	zprg.mode = 64;

 	pcstr = "%.6llux ";
 	nuxiinit();
 	histgen = 0;
 	textp = P;
 	datap = P;
 	edatap = P;
 	pc = 0;
 	dtype = 4;
 	version = 0;
 	cbp = buf.cbuf;
 	cbc = sizeof(buf.cbuf);
 	firstp = prg();
 	lastp = firstp;

 	while(*argv)
 		objfile(*argv++);

 	if(!debug['l'])
 		loadlib();

 	deadcode();

 	firstp = firstp->link;
 	if(firstp == P)
 		errorexit();

 	if(doexp || dlm){
 		EXPTAB = "_exporttab";
 		zerosig(EXPTAB);
 		zerosig("etext");
 		zerosig("edata");
 		zerosig("end");
 		if(dlm){
 			import();
 			HEADTYPE = 2;
 			INITTEXT = 0;
 			INITDAT = 0;
 			INITRND = 8;
 			INITENTRY = EXPTAB;
 		}
 		export();
 	}

 	patch();
 	follow();
 	doelf();
 	if(HEADTYPE == 6)
 		domacho();
 	dodata();
 	dobss();
 	dostkoff();
 	paramspace = "SP";	/* (FP) now (SP) on output */
 	if(debug['p'])
 		if(debug['1'])
 			doprof1();
 		else
 			doprof2();
 	span();
 	doinit();
 	asmb();
 	undef();
 	if(debug['v']) {
 		Bprint(&bso, "%5.2f cpu time\n", cputime());
 		Bprint(&bso, "%ld symbols\n", nsymbol);
 		Bprint(&bso, "%d sizeof adr\n", sizeof(Adr));
 		Bprint(&bso, "%d sizeof prog\n", sizeof(Prog));
 	}
 	Bflush(&bso);

 	errorexit();
 }

 void
 zaddr(Biobuf *f, Adr *a, Sym *h[])
 {
 	int t;
 	int32 l;
 	Sym *s;
 	Auto *u;

 	t = Bgetc(f);
 	a->index = D_NONE;
 	a->scale = 0;
 	if(t & T_INDEX) {
 		a->index = Bgetc(f);
 		a->scale = Bgetc(f);
 	}
 	a->offset = 0;
 	if(t & T_OFFSET) {
 		a->offset = Bget4(f);
 		if(t & T_64) {
 			a->offset &= 0xFFFFFFFFULL;
 			a->offset |= (vlong)Bget4(f) << 32;
 		}
 	}
 	a->sym = S;
 	if(t & T_SYM)
 		a->sym = h[Bgetc(f)];
 	a->type = D_NONE;
 	if(t & T_FCONST) {
 		a->ieee.l = Bget4(f);
 		a->ieee.h = Bget4(f);
 		a->type = D_FCONST;
 	} else
 	if(t & T_SCONST) {
 		Bread(f, a->scon, NSNAME);
 		a->type = D_SCONST;
 	}
 	if(t & T_TYPE)
 		a->type = Bgetc(f);
 	adrgotype = S;
 	if(t & T_GOTYPE)
 		adrgotype = h[Bgetc(f)];
 	s = a->sym;
 	if(s == S)
 		return;

 	t = a->type;
 	if(t != D_AUTO && t != D_PARAM) {
 		if(adrgotype)
 			s->gotype = adrgotype;
 		return;
 	}
 	l = a->offset;
 	for(u=curauto; u; u=u->link) {
 		if(u->asym == s)
 		if(u->type == t) {
 			if(u->aoffset > l)
 				u->aoffset = l;
 			if(adrgotype)
 				u->gotype = adrgotype;
 			return;
 		}
 	}

 	u = mal(sizeof(*u));
 	u->link = curauto;
 	curauto = u;
 	u->asym = s;
 	u->aoffset = l;
 	u->type = t;
 	u->gotype = adrgotype;
 }

 void
 nopout(Prog *p)
 {
 	p->as = ANOP;
 	p->from.type = D_NONE;
 	p->to.type = D_NONE;
 }

 void
 ldobj1(Biobuf *f, int64 len, char *pn)
 {
 	vlong ipc;
 	Prog *p, *t;
 	int v, o, r, skip, mode;
 	Sym *h[NSYM], *s, *di;
 	uint32 sig;
 	char *name;
 	int ntext;
 	vlong eof;
 	char src[1024];

 	ntext = 0;
 	eof = Boffset(f) + len;
 	di = S;
 	src[0] = 0;

 newloop:
 	memset(h, 0, sizeof(h));
 	version++;
 	histfrogp = 0;
 	ipc = pc;
 	skip = 0;
 	mode = 64;

 loop:
 	if(f->state == Bracteof || Boffset(f) >= eof)
 		goto eof;
 	o = Bgetc(f);
 	if(o == Beof)
 		goto eof;
 	o |= Bgetc(f) << 8;
 	if(o <= AXXX || o >= ALAST) {
 		if(o < 0)
 			goto eof;
 		diag("%s:#%lld: opcode out of range: %#ux", pn, Boffset(f), o);
 		print("	probably not a .6 file\n");
 		errorexit();
 	}

 	if(o == ANAME || o == ASIGNAME) {
 		sig = 0;
 		if(o == ASIGNAME)
 			sig = Bget4(f);
 		v = Bgetc(f);	/* type */
 		o = Bgetc(f);	/* sym */
 		r = 0;
 		if(v == D_STATIC)
 			r = version;
 		name = Brdline(f, '\0');
 		if(name == nil) {
 			if(Blinelen(f) > 0) {
 				fprint(2, "%s: name too long\n", pn);
 				errorexit();
 			}
 			goto eof;
 		}
 		s = lookup(name, r);

 		if(debug['S'] && r == 0)
 			sig = 1729;
 		if(sig != 0){
 			if(s->sig != 0 && s->sig != sig)
 				diag("incompatible type signatures"
 					"%lux(%s) and %lux(%s) for %s",
 					s->sig, s->file, sig, pn, s->name);
 			s->sig = sig;
 			s->file = pn;
 		}

 		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;
 	}

 	p = mal(sizeof(*p));
 	p->as = o;
 	p->line = Bget4(f);
 	p->back = 2;
 	p->mode = mode;
 	p->ft = 0;
 	p->tt = 0;
 	zaddr(f, &p->from, h);
 	fromgotype = adrgotype;
 	zaddr(f, &p->to, h);

 	if(debug['W'])
 		print("%P\n", p);

 	switch(p->as) {
 	case AHISTORY:
 		if(p->to.offset == -1) {
 			addlib(src, pn);
 			histfrogp = 0;
 			goto loop;
 		}
 		if(src[0] == '\0')
 			copyhistfrog(src, sizeof src);
 		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(Boffset(f) == eof)
 			return;
 		goto newloop;

 	case AGLOBL:
 		s = p->from.sym;
 		if(s->type == 0 || s->type == SXREF) {
 			s->type = SBSS;
 			s->value = 0;
 		}
 		if(s->type != SBSS) {
 			diag("%s: redefinition: %s in %s",
 				pn, s->name, TNAME);
 			s->type = SBSS;
 			s->value = 0;
 		}
 		if(p->to.offset > s->value)
 			s->value = p->to.offset;
 		if(p->from.scale & DUPOK)
 			s->dupok = 1;
 		goto loop;

 	case ADYNT:
 		if(p->to.sym == S) {
 			diag("DYNT without a sym\n%P", p);
 			break;
 		}
 		di = p->to.sym;
 		p->from.scale = 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_ADDR;
 		p->to.index = D_EXTERN;
 		goto data;

 	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;
 		goto data;

 	case ADATA:
 	data:
 		// Assume that AGLOBL comes after ADATA.
 		// If we've seen an AGLOBL that said this sym was DUPOK,
 		// ignore any more ADATA we see, which must be
 		// redefinitions.
 		s = p->from.sym;
 		if(s != S && s->dupok) {
 //			if(debug['v'])
 //				Bprint(&bso, "skipping %s in %s: dupok\n", s->name, pn);
 			goto loop;
 		}
 		if(s != S) {
 			p->dlink = s->data;
 			s->data = p;
 		}
 		if(edatap == P)
 			datap = p;
 		else
 			edatap->link = p;
 		edatap = p;
 		p->link = P;
 		goto loop;

 	case AGOK:
 		diag("%s: GOK opcode in %s", pn, TNAME);
 		pc++;
 		goto loop;

 	case ATEXT:
 		s = p->from.sym;
 		if(ntext++ == 0 && s->type != 0 && s->type != SXREF) {
 			/* redefinition, so file has probably been seen before */
 			if(debug['v'])
 				Bprint(&bso, "skipping: %s: redefinition: %s", pn, s->name);
 			return;
 		}
 		if(curtext != P) {
 			histtoauto();
 			curtext->to.autom = curauto;
 			curauto = 0;
 		}
 		skip = 0;
 		curtext = p;
 		if(s == S) {
 			diag("%s: no TEXT symbol: %P", pn, p);
 			errorexit();
 		}
 		if(s->type != 0 && s->type != SXREF) {
 			if(p->from.scale & DUPOK) {
 				skip = 1;
 				goto casdef;
 			}
 			diag("%s: redefinition: %s\n%P", pn, s->name, p);
 		}
 		if(fromgotype) {
 			if(s->gotype && s->gotype != fromgotype)
 				diag("%s: type mismatch for %s", pn, s->name);
 			s->gotype = fromgotype;
 		}
 		newtext(p, s);
 		goto loop;

 	case AMODE:
 		if(p->from.type == D_CONST || p->from.type == D_INDIR+D_NONE){
 			switch((int)p->from.offset){
 			case 16: case 32: case 64:
 				mode = p->from.offset;
 				break;
 			}
 		}
 		goto loop;

 	case AFMOVF:
 	case AFADDF:
 	case AFSUBF:
 	case AFSUBRF:
 	case AFMULF:
 	case AFDIVF:
 	case AFDIVRF:
 	case AFCOMF:
 	case AFCOMFP:
 	case AMOVSS:
 	case AADDSS:
 	case ASUBSS:
 	case AMULSS:
 	case ADIVSS:
 	case ACOMISS:
 	case AUCOMISS:
 		if(skip)
 			goto casdef;
 		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_EXTERN;
 				t->from.sym = s;
 				t->from.scale = 4;
 				t->to = p->from;
 				if(edatap == P)
 					datap = t;
 				else
 					edatap->link = t;
 				edatap = t;
 				t->link = P;
 			}
 			p->from.type = D_EXTERN;
 			p->from.sym = s;
 			p->from.offset = 0;
 		}
 		goto casdef;

 	case AFMOVD:
 	case AFADDD:
 	case AFSUBD:
 	case AFSUBRD:
 	case AFMULD:
 	case AFDIVD:
 	case AFDIVRD:
 	case AFCOMD:
 	case AFCOMDP:
 	case AMOVSD:
 	case AADDSD:
 	case ASUBSD:
 	case AMULSD:
 	case ADIVSD:
 	case ACOMISD:
 	case AUCOMISD:
 		if(skip)
 			goto casdef;
 		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_EXTERN;
 				t->from.sym = s;
 				t->from.scale = 8;
 				t->to = p->from;
 				if(edatap == P)
 					datap = t;
 				else
 					edatap->link = t;
 				edatap = t;
 				t->link = P;
 			}
 			p->from.type = D_EXTERN;
 			p->from.sym = s;
 			p->from.offset = 0;
 		}
 		goto casdef;

 	casdef:
 	default:
 		if(skip)
 			nopout(p);

 		if(p->to.type == D_BRANCH)
 			p->to.offset += ipc;
 		lastp->link = p;
 		lastp = p;
 		p->pc = pc;
 		pc++;
 		goto loop;
 	}
 	goto loop;

 eof:
 	diag("truncated object file: %s", pn);
 }

 Prog*
 prg(void)
 {
 	Prog *p;

 	p = mal(sizeof(*p));

 	*p = zprg;
 	return p;
 }

 Prog*
 copyp(Prog *q)
 {
 	Prog *p;

 	p = prg();
 	*p = *q;
 	return p;
 }

 Prog*
 appendp(Prog *q)
 {
 	Prog *p;

 	p = prg();
 	p->link = q->link;
 	q->link = p;
 	p->line = q->line;
 	p->mode = q->mode;
 	return p;
 }

 void
 doprof1(void)
 {
 	Sym *s;
 	int32 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_EXTERN;
 			q->from.offset = n*4;
 			q->from.sym = s;
 			q->from.scale = 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 = AADDL;
 			p->from.type = D_CONST;
 			p->from.offset = 1;
 			p->to.type = 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_EXTERN;
 	q->from.sym = s;
 	q->from.scale = 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, *ps2, *ps4;

 	if(debug['v'])
 		Bprint(&bso, "%5.2f profile 2\n", cputime());
 	Bflush(&bso);

 	s2 = lookup("_profin", 0);
 	s4 = lookup("_profout", 0);
 	if(s2->type != STEXT || s4->type != STEXT) {
 		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) {
 				p->from.scale = 1;
 				ps2 = p;
 			}
 			if(p->from.sym == s4) {
 				p->from.scale = 1;
 				ps4 = p;
 			}
 		}
 	}
 	for(p = firstp; p != P; p = p->link) {
 		if(p->as == ATEXT) {
 			curtext = p;

 			if(p->from.scale & NOPROF) {	/* dont profile */
 				for(;;) {
 					q = p->link;
 					if(q == P)
 						break;
 					if(q->as == ATEXT)
 						break;
 					p = q;
 				}
 				continue;
 			}

 			/*
 			 * JMPL	profin
 			 */
 			q = prg();
 			q->line = p->line;
 			q->pc = p->pc;
 			q->link = p->link;
 			p->link = q;
 			p = q;
 			p->as = ACALL;
 			p->to.type = D_BRANCH;
 			p->pcond = ps2;
 			p->to.sym = s2;

 			continue;
 		}
 		if(p->as == ARET) {
 			/*
 			 * 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 = ACALL;
 			p->from = zprg.from;
 			p->to = zprg.to;
 			p->to.type = D_BRANCH;
 			p->pcond = ps4;
 			p->to.sym = s4;

 			p = q;

 			continue;
 		}
 	}
 }
	// Inferno utils/6l/obj.c
	// http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.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.

	#define EXTERN
	#include "l.h"
	#include "../ld/lib.h"
	#include "../ld/elf.h"
	#include "../ld/macho.h"
	#include <ar.h>

	char *noname = "<none>";
	char thechar = '6';
	char* thestring = "amd64";
	char* paramspace = "FP";

	/*
	* -H2 -T4136 -R4096 is plan9 64-bit format
	* -H3 -T4128 -R4096 is plan9 32-bit format
	* -H5 -T0x80110000 -R4096 is ELF32
	* -H6 -Tx -Rx is apple MH-exec
	* -H7 -Tx -Rx is linux elf-exec
	* -H9 -Tx -Rx is FreeBSD elf-exec
	*
	* options used: 189BLQSWabcjlnpsvz
	*/

	static int
	isobjfile(char *f)
	{
	int n, v;
	Biobuf *b;
	char buf1[5], buf2[SARMAG];

	b = Bopen(f, OREAD);
	if(b == nil)
	return 0;
	n = Bread(b, buf1, 5);
	if(n == 5 && (buf1[2] == 1 && buf1[3] == '<' \|\| buf1[3] == 1 && buf1[4] == '<'))
	v = 1; /* good enough for our purposes */
	else {
	Bseek(b, 0, 0);
	n = Bread(b, buf2, SARMAG);
	v = n == SARMAG && strncmp(buf2, ARMAG, SARMAG) == 0;
	}
	Bterm(b);
	return v;
	}

	void
	usage(void)
	{
	fprint(2, "usage: 6l [-options] [-E entry] [-H head] [-L dir] [-T text] [-R rnd] [-o out] files...\n");
	exits("usage");
	}

	void
	main(int argc, char *argv[])
	{
	int i, c;

	Binit(&bso, 1, OWRITE);
	cout = -1;
	listinit();
	memset(debug, 0, sizeof(debug));
	nerrors = 0;
	outfile = "6.out";
	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': /* output to (next arg) */
	outfile = EARGF(usage());
	break;
	case 'E':
	INITENTRY = EARGF(usage());
	break;
	case 'H':
	HEADTYPE = atolwhex(EARGF(usage()));
	break;
	case 'L':
	Lflag(EARGF(usage()));
	break;
	case 'T':
	INITTEXT = atolwhex(EARGF(usage()));
	break;
	case 'D':
	INITDAT = atolwhex(EARGF(usage()));
	break;
	case 'R':
	INITRND = atolwhex(EARGF(usage()));
	break;
	case 'x': /* produce export table */
	doexp = 1;
	if(argv[1] != nil && argv[1][0] != '-' && !isobjfile(argv[1]))
	readundefs(ARGF(), SEXPORT);
	break;
	case 'u': /* produce dynamically loadable module */
	dlm = 1;
	debug['l']++;
	if(argv[1] != nil && argv[1][0] != '-' && !isobjfile(argv[1]))
	readundefs(ARGF(), SIMPORT);
	break;
	} ARGEND
	USED(argc);
	if(*argv == 0)
	usage();

	libinit();

	if(HEADTYPE == -1) {
	HEADTYPE = 2;
	if(strcmp(goos, "linux") == 0)
	HEADTYPE = 7;
	else
	if(strcmp(goos, "darwin") == 0)
	HEADTYPE = 6;
	else
	if(strcmp(goos, "freebsd") == 0)
	HEADTYPE = 9;
	else
	print("goos is not known: %s\n", goos);
	}

	switch(HEADTYPE) {
	default:
	diag("unknown -H option");
	errorexit();
	case 2: /* plan 9 */
	HEADR = 32L+8L;
	if(INITTEXT == -1)
	INITTEXT = 4096+HEADR;
	if(INITDAT == -1)
	INITDAT = 0;
	if(INITRND == -1)
	INITRND = 4096;
	break;
	case 3: /* plan 9 */
	HEADR = 32L;
	if(INITTEXT == -1)
	INITTEXT = 4096+32;
	if(INITDAT == -1)
	INITDAT = 0;
	if(INITRND == -1)
	INITRND = 4096;
	break;
	case 5: /* elf32 executable */
	HEADR = rnd(52L+3*32L, 16);
	if(INITTEXT == -1)
	INITTEXT = 0x80110000L;
	if(INITDAT == -1)
	INITDAT = 0;
	if(INITRND == -1)
	INITRND = 4096;
	break;
	case 6: /* apple MACH */
	machoinit();
	HEADR = MACHORESERVE;
	if(INITRND == -1)
	INITRND = 4096;
	if(INITTEXT == -1)
	INITTEXT = 4096+HEADR;
	if(INITDAT == -1)
	INITDAT = 0;
	break;
	case 7: /* elf64 executable */
	case 9: /* freebsd */
	elfinit();
	HEADR = ELFRESERVE;
	if(INITTEXT == -1)
	INITTEXT = (1<<22)+HEADR;
	if(INITDAT == -1)
	INITDAT = 0;
	if(INITRND == -1)
	INITRND = 4096;
	break;
	}
	if(INITDAT != 0 && INITRND != 0)
	print("warning: -D0x%llux is ignored because of -R0x%lux\n",
	INITDAT, INITRND);
	if(debug['v'])
	Bprint(&bso, "HEADER = -H%ld -T0x%llux -D0x%llux -R0x%lux\n",
	HEADTYPE, INITTEXT, INITDAT, INITRND);
	Bflush(&bso);
	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;
	}

	zprg.link = P;
	zprg.pcond = P;
	zprg.back = 2;
	zprg.as = AGOK;
	zprg.from.type = D_NONE;
	zprg.from.index = D_NONE;
	zprg.from.scale = 1;
	zprg.to = zprg.from;
	zprg.mode = 64;

	pcstr = "%.6llux ";
	nuxiinit();
	histgen = 0;
	textp = P;
	datap = P;
	edatap = P;
	pc = 0;
	dtype = 4;
	version = 0;
	cbp = buf.cbuf;
	cbc = sizeof(buf.cbuf);
	firstp = prg();
	lastp = firstp;

	while(*argv)
	objfile(*argv++);

	if(!debug['l'])
	loadlib();

	deadcode();

	firstp = firstp->link;
	if(firstp == P)
	errorexit();

	if(doexp \|\| dlm){
	EXPTAB = "_exporttab";
	zerosig(EXPTAB);
	zerosig("etext");
	zerosig("edata");
	zerosig("end");
	if(dlm){
	import();
	HEADTYPE = 2;
	INITTEXT = 0;
	INITDAT = 0;
	INITRND = 8;
	INITENTRY = EXPTAB;
	}
	export();
	}

	patch();
	follow();
	doelf();
	if(HEADTYPE == 6)
	domacho();
	dodata();
	dobss();
	dostkoff();
	paramspace = "SP"; /* (FP) now (SP) on output */
	if(debug['p'])
	if(debug['1'])
	doprof1();
	else
	doprof2();
	span();
	doinit();
	asmb();
	undef();
	if(debug['v']) {
	Bprint(&bso, "%5.2f cpu time\n", cputime());
	Bprint(&bso, "%ld symbols\n", nsymbol);
	Bprint(&bso, "%d sizeof adr\n", sizeof(Adr));
	Bprint(&bso, "%d sizeof prog\n", sizeof(Prog));
	}
	Bflush(&bso);

	errorexit();
	}

	void
	zaddr(Biobuf f, Adr a, Sym *h[])
	{
	int t;
	int32 l;
	Sym *s;
	Auto *u;

	t = Bgetc(f);
	a->index = D_NONE;
	a->scale = 0;
	if(t & T_INDEX) {
	a->index = Bgetc(f);
	a->scale = Bgetc(f);
	}
	a->offset = 0;
	if(t & T_OFFSET) {
	a->offset = Bget4(f);
	if(t & T_64) {
	a->offset &= 0xFFFFFFFFULL;
	a->offset \|= (vlong)Bget4(f) << 32;
	}
	}
	a->sym = S;
	if(t & T_SYM)
	a->sym = h[Bgetc(f)];
	a->type = D_NONE;
	if(t & T_FCONST) {
	a->ieee.l = Bget4(f);
	a->ieee.h = Bget4(f);
	a->type = D_FCONST;
	} else
	if(t & T_SCONST) {
	Bread(f, a->scon, NSNAME);
	a->type = D_SCONST;
	}
	if(t & T_TYPE)
	a->type = Bgetc(f);
	adrgotype = S;
	if(t & T_GOTYPE)
	adrgotype = h[Bgetc(f)];
	s = a->sym;
	if(s == S)
	return;

	t = a->type;
	if(t != D_AUTO && t != D_PARAM) {
	if(adrgotype)
	s->gotype = adrgotype;
	return;
	}
	l = a->offset;
	for(u=curauto; u; u=u->link) {
	if(u->asym == s)
	if(u->type == t) {
	if(u->aoffset > l)
	u->aoffset = l;
	if(adrgotype)
	u->gotype = adrgotype;
	return;
	}
	}

	u = mal(sizeof(*u));
	u->link = curauto;
	curauto = u;
	u->asym = s;
	u->aoffset = l;
	u->type = t;
	u->gotype = adrgotype;
	}

	void
	nopout(Prog *p)
	{
	p->as = ANOP;
	p->from.type = D_NONE;
	p->to.type = D_NONE;
	}

	void
	ldobj1(Biobuf f, int64 len, char pn)
	{
	vlong ipc;
	Prog p, t;
	int v, o, r, skip, mode;
	Sym h[NSYM], s, *di;
	uint32 sig;
	char *name;
	int ntext;
	vlong eof;
	char src[1024];

	ntext = 0;
	eof = Boffset(f) + len;
	di = S;
	src[0] = 0;

	newloop:
	memset(h, 0, sizeof(h));
	version++;
	histfrogp = 0;
	ipc = pc;
	skip = 0;
	mode = 64;

	loop:
	if(f->state == Bracteof \|\| Boffset(f) >= eof)
	goto eof;
	o = Bgetc(f);
	if(o == Beof)
	goto eof;
	o \|= Bgetc(f) << 8;
	if(o <= AXXX \|\| o >= ALAST) {
	if(o < 0)
	goto eof;
	diag("%s:#%lld: opcode out of range: %#ux", pn, Boffset(f), o);
	print(" probably not a .6 file\n");
	errorexit();
	}

	if(o == ANAME \|\| o == ASIGNAME) {
	sig = 0;
	if(o == ASIGNAME)
	sig = Bget4(f);
	v = Bgetc(f); /* type */
	o = Bgetc(f); /* sym */
	r = 0;
	if(v == D_STATIC)
	r = version;
	name = Brdline(f, '\0');
	if(name == nil) {
	if(Blinelen(f) > 0) {
	fprint(2, "%s: name too long\n", pn);
	errorexit();
	}
	goto eof;
	}
	s = lookup(name, r);

	if(debug['S'] && r == 0)
	sig = 1729;
	if(sig != 0){
	if(s->sig != 0 && s->sig != sig)
	diag("incompatible type signatures"
	"%lux(%s) and %lux(%s) for %s",
	s->sig, s->file, sig, pn, s->name);
	s->sig = sig;
	s->file = pn;
	}

	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;
	}

	p = mal(sizeof(*p));
	p->as = o;
	p->line = Bget4(f);
	p->back = 2;
	p->mode = mode;
	p->ft = 0;
	p->tt = 0;
	zaddr(f, &p->from, h);
	fromgotype = adrgotype;
	zaddr(f, &p->to, h);

	if(debug['W'])
	print("%P\n", p);

	switch(p->as) {
	case AHISTORY:
	if(p->to.offset == -1) {
	addlib(src, pn);
	histfrogp = 0;
	goto loop;
	}
	if(src[0] == '\0')
	copyhistfrog(src, sizeof src);
	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(Boffset(f) == eof)
	return;
	goto newloop;

	case AGLOBL:
	s = p->from.sym;
	if(s->type == 0 \|\| s->type == SXREF) {
	s->type = SBSS;
	s->value = 0;
	}
	if(s->type != SBSS) {
	diag("%s: redefinition: %s in %s",
	pn, s->name, TNAME);
	s->type = SBSS;
	s->value = 0;
	}
	if(p->to.offset > s->value)
	s->value = p->to.offset;
	if(p->from.scale & DUPOK)
	s->dupok = 1;
	goto loop;

	case ADYNT:
	if(p->to.sym == S) {
	diag("DYNT without a sym\n%P", p);
	break;
	}
	di = p->to.sym;
	p->from.scale = 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_ADDR;
	p->to.index = D_EXTERN;
	goto data;

	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;
	goto data;

	case ADATA:
	data:
	// Assume that AGLOBL comes after ADATA.
	// If we've seen an AGLOBL that said this sym was DUPOK,
	// ignore any more ADATA we see, which must be
	// redefinitions.
	s = p->from.sym;
	if(s != S && s->dupok) {
	// if(debug['v'])
	// Bprint(&bso, "skipping %s in %s: dupok\n", s->name, pn);
	goto loop;
	}
	if(s != S) {
	p->dlink = s->data;
	s->data = p;
	}
	if(edatap == P)
	datap = p;
	else
	edatap->link = p;
	edatap = p;
	p->link = P;
	goto loop;

	case AGOK:
	diag("%s: GOK opcode in %s", pn, TNAME);
	pc++;
	goto loop;

	case ATEXT:
	s = p->from.sym;
	if(ntext++ == 0 && s->type != 0 && s->type != SXREF) {
	/* redefinition, so file has probably been seen before */
	if(debug['v'])
	Bprint(&bso, "skipping: %s: redefinition: %s", pn, s->name);
	return;
	}
	if(curtext != P) {
	histtoauto();
	curtext->to.autom = curauto;
	curauto = 0;
	}
	skip = 0;
	curtext = p;
	if(s == S) {
	diag("%s: no TEXT symbol: %P", pn, p);
	errorexit();
	}
	if(s->type != 0 && s->type != SXREF) {
	if(p->from.scale & DUPOK) {
	skip = 1;
	goto casdef;
	}
	diag("%s: redefinition: %s\n%P", pn, s->name, p);
	}
	if(fromgotype) {
	if(s->gotype && s->gotype != fromgotype)
	diag("%s: type mismatch for %s", pn, s->name);
	s->gotype = fromgotype;
	}
	newtext(p, s);
	goto loop;

	case AMODE:
	if(p->from.type == D_CONST \|\| p->from.type == D_INDIR+D_NONE){
	switch((int)p->from.offset){
	case 16: case 32: case 64:
	mode = p->from.offset;
	break;
	}
	}
	goto loop;

	case AFMOVF:
	case AFADDF:
	case AFSUBF:
	case AFSUBRF:
	case AFMULF:
	case AFDIVF:
	case AFDIVRF:
	case AFCOMF:
	case AFCOMFP:
	case AMOVSS:
	case AADDSS:
	case ASUBSS:
	case AMULSS:
	case ADIVSS:
	case ACOMISS:
	case AUCOMISS:
	if(skip)
	goto casdef;
	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_EXTERN;
	t->from.sym = s;
	t->from.scale = 4;
	t->to = p->from;
	if(edatap == P)
	datap = t;
	else
	edatap->link = t;
	edatap = t;
	t->link = P;
	}
	p->from.type = D_EXTERN;
	p->from.sym = s;
	p->from.offset = 0;
	}
	goto casdef;

	case AFMOVD:
	case AFADDD:
	case AFSUBD:
	case AFSUBRD:
	case AFMULD:
	case AFDIVD:
	case AFDIVRD:
	case AFCOMD:
	case AFCOMDP:
	case AMOVSD:
	case AADDSD:
	case ASUBSD:
	case AMULSD:
	case ADIVSD:
	case ACOMISD:
	case AUCOMISD:
	if(skip)
	goto casdef;
	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_EXTERN;
	t->from.sym = s;
	t->from.scale = 8;
	t->to = p->from;
	if(edatap == P)
	datap = t;
	else
	edatap->link = t;
	edatap = t;
	t->link = P;
	}
	p->from.type = D_EXTERN;
	p->from.sym = s;
	p->from.offset = 0;
	}
	goto casdef;

	casdef:
	default:
	if(skip)
	nopout(p);

	if(p->to.type == D_BRANCH)
	p->to.offset += ipc;
	lastp->link = p;
	lastp = p;
	p->pc = pc;
	pc++;
	goto loop;
	}
	goto loop;

	eof:
	diag("truncated object file: %s", pn);
	}

	Prog*
	prg(void)
	{
	Prog *p;

	p = mal(sizeof(*p));

	*p = zprg;
	return p;
	}

	Prog*
	copyp(Prog *q)
	{
	Prog *p;

	p = prg();
	p = q;
	return p;
	}

	Prog*
	appendp(Prog *q)
	{
	Prog *p;

	p = prg();
	p->link = q->link;
	q->link = p;
	p->line = q->line;
	p->mode = q->mode;
	return p;
	}

	void
	doprof1(void)
	{
	Sym *s;
	int32 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_EXTERN;
	q->from.offset = n*4;
	q->from.sym = s;
	q->from.scale = 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 = AADDL;
	p->from.type = D_CONST;
	p->from.offset = 1;
	p->to.type = 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_EXTERN;
	q->from.sym = s;
	q->from.scale = 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, ps2, ps4;

	if(debug['v'])
	Bprint(&bso, "%5.2f profile 2\n", cputime());
	Bflush(&bso);

	s2 = lookup("_profin", 0);
	s4 = lookup("_profout", 0);
	if(s2->type != STEXT \|\| s4->type != STEXT) {
	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) {
	p->from.scale = 1;
	ps2 = p;
	}
	if(p->from.sym == s4) {
	p->from.scale = 1;
	ps4 = p;
	}
	}
	}
	for(p = firstp; p != P; p = p->link) {
	if(p->as == ATEXT) {
	curtext = p;

	if(p->from.scale & NOPROF) { /* dont profile */
	for(;;) {
	q = p->link;
	if(q == P)
	break;
	if(q->as == ATEXT)
	break;
	p = q;
	}
	continue;
	}

	/*
	* JMPL profin
	*/
	q = prg();
	q->line = p->line;
	q->pc = p->pc;
	q->link = p->link;
	p->link = q;
	p = q;
	p->as = ACALL;
	p->to.type = D_BRANCH;
	p->pcond = ps2;
	p->to.sym = s2;

	continue;
	}
	if(p->as == ARET) {
	/*
	* 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 = ACALL;
	p->from = zprg.from;
	p->to = zprg.to;
	p->to.type = D_BRANCH;
	p->pcond = ps4;
	p->to.sym = s4;

	p = q;

	continue;
	}
	}
	}