src/cmd/5l/asm.c

// Inferno utils/5l/asm.c
// http://code.google.com/p/inferno-os/source/browse/utils/5l/asm.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.

#include	"l.h"

int32	OFFSET;

static Prog *PP;

int32
entryvalue(void)
{
	char *a;
	Sym *s;

	a = INITENTRY;
	if(*a >= '0' && *a <= '9')
		return atolwhex(a);
	s = lookup(a, 0);
	if(s->type == 0)
		return INITTEXT;
	switch(s->type) {
	case STEXT:
	case SLEAF:
		break;
	case SDATA:
		if(dlm)
			return s->value+INITDAT;
	default:
		diag("entry not text: %s", s->name);
	}
	return s->value;
}

void
asmb(void)
{
	Prog *p;
	int32 t, etext;
	int np;
	vlong va, fo, w, symo;
	int strtabsize;
	vlong symdatva = 0x99LL<<24;
	Optab *o;

	strtabsize = 0;
	symo = 0;

	if(debug['v'])
		Bprint(&bso, "%5.2f asm\n", cputime());
	Bflush(&bso);
	OFFSET = HEADR;
	seek(cout, OFFSET, 0);
	pc = INITTEXT;
	for(p = firstp; p != P; p = p->link) {
		setarch(p);
		if(p->as == ATEXT) {
			curtext = p;
			autosize = p->to.offset + 4;
		}
		if(p->pc != pc) {
			diag("phase error %lux sb %lux",
				p->pc, pc);
			if(!debug['a'])
				prasm(curp);
			pc = p->pc;
		}
		curp = p;
		o = oplook(p);	/* could probably avoid this call */
		if(thumb)
			thumbasmout(p, o);
		else
			asmout(p, o);
		pc += o->size;
	}
	while(pc-INITTEXT < textsize) {
		cput(0);
		pc++;
	}

	if(debug['a'])
		Bprint(&bso, "\n");
	Bflush(&bso);
	cflush();

	/* output strings in text segment */
	etext = INITTEXT + textsize;
	for(t = pc; t < etext; t += sizeof(buf)-100) {
		if(etext-t > sizeof(buf)-100)
			datblk(t, sizeof(buf)-100, 1);
		else
			datblk(t, etext-t, 1);
	}

	/* output section header strings */
	curtext = P;
	switch(HEADTYPE) {
	case 0:
	case 1:
	case 2:
	case 5:
		OFFSET = HEADR+textsize;
		seek(cout, OFFSET, 0);
		break;
	case 3:
		OFFSET = rnd(HEADR+textsize, 4096);
		seek(cout, OFFSET, 0);
		break;
	case 6:
		seek(cout, rnd(HEADR+textsize, INITRND)+datsize, 0);
		strtabsize = linuxstrtable();
		cflush();
		t = rnd(HEADR+textsize, INITRND);
		seek(cout, t, 0);
		break;
	}
	if(dlm){
		char buf[8];

		write(cout, buf, INITDAT-textsize);
		textsize = INITDAT;
	}
	for(t = 0; t < datsize; t += sizeof(buf)-100) {
		if(datsize-t > sizeof(buf)-100)
			datblk(t, sizeof(buf)-100, 0);
		else
			datblk(t, datsize-t, 0);
	}
	cflush();

	/* output symbol table */
	symsize = 0;
	lcsize = 0;
	if(!debug['s']) {
		if(debug['v'])
			Bprint(&bso, "%5.2f sym\n", cputime());
		Bflush(&bso);
		switch(HEADTYPE) {
		case 0:
		case 1:
		case 4:
		case 5:
			debug['s'] = 1;
			break;
		case 2:
			OFFSET = HEADR+textsize+datsize;
			seek(cout, OFFSET, 0);
			break;
		case 3:
			OFFSET += rnd(datsize, 4096);
			seek(cout, OFFSET, 0);
			break;
		case 6:
			symo = rnd(HEADR+textsize, INITRND)+datsize+strtabsize;
			symo = rnd(symo, INITRND);
			seek(cout, symo + 8, 0);
			break;
		}
		if(!debug['s'])
			asmsym();
		if(debug['v'])
			Bprint(&bso, "%5.2f pc\n", cputime());
		Bflush(&bso);
		if(!debug['s'])
			asmlc();
		if(!debug['s'])
			asmthumbmap();
		if(dlm)
			asmdyn();
		cflush();
	}
	else if(dlm){
		seek(cout, HEADR+textsize+datsize, 0);
		asmdyn();
		cflush();
	}

	curtext = P;
	if(debug['v'])
		Bprint(&bso, "%5.2f header\n", cputime());
	Bflush(&bso);
	OFFSET = 0;
	seek(cout, OFFSET, 0);
	switch(HEADTYPE) {
	case 0:	/* no header */
		break;
	case 1:	/* aif for risc os */
		lputl(0xe1a00000);		/* NOP - decompress code */
		lputl(0xe1a00000);		/* NOP - relocation code */
		lputl(0xeb000000 + 12);		/* BL - zero init code */
		lputl(0xeb000000 +
			(entryvalue()
			 - INITTEXT
			 + HEADR
			 - 12
			 - 8) / 4);		/* BL - entry code */

		lputl(0xef000011);		/* SWI - exit code */
		lputl(textsize+HEADR);		/* text size */
		lputl(datsize);			/* data size */
		lputl(0);			/* sym size */

		lputl(bsssize);			/* bss size */
		lputl(0);			/* sym type */
		lputl(INITTEXT-HEADR);		/* text addr */
		lputl(0);			/* workspace - ignored */

		lputl(32);			/* addr mode / data addr flag */
		lputl(0);			/* data addr */
		for(t=0; t<2; t++)
			lputl(0);		/* reserved */

		for(t=0; t<15; t++)
			lputl(0xe1a00000);	/* NOP - zero init code */
		lputl(0xe1a0f00e);		/* B (R14) - zero init return */
		break;
	case 2:	/* plan 9 */
		if(dlm)
			lput(0x80000000|0x647);	/* magic */
		else
			lput(0x647);			/* magic */
		lput(textsize);			/* sizes */
		lput(datsize);
		lput(bsssize);
		lput(symsize);			/* nsyms */
		lput(entryvalue());		/* va of entry */
		lput(0L);
		lput(lcsize);
		break;
	case 3:	/* boot for NetBSD */
		lput((143<<16)|0413);		/* magic */
		lputl(rnd(HEADR+textsize, 4096));
		lputl(rnd(datsize, 4096));
		lputl(bsssize);
		lputl(symsize);			/* nsyms */
		lputl(entryvalue());		/* va of entry */
		lputl(0L);
		lputl(0L);
		break;
	case 4: /* boot for IXP1200 */
		break;
	case 5: /* boot for ipaq */
		lputl(0xe3300000);		/* nop */
		lputl(0xe3300000);		/* nop */
		lputl(0xe3300000);		/* nop */
		lputl(0xe3300000);		/* nop */
		break;
	case 6:
		/* elf arm */
		strnput("\177ELF", 4);		/* e_ident */
		cput(1);			/* class = 32 bit */
		cput(1);			/* data = LSB */
		cput(1);			/* version = CURRENT */
		strnput("", 9);

		wputl(2);			/* type = EXEC */
		wputl(40);			/* machine = ARM */
		lputl(1L);			/* version = CURRENT */
		lputl(entryvalue());		/* entry vaddr */
		lputl(52L);			/* offset to first phdr */
		np = 3;
		if(!debug['s'])
			np++;
		lputl(52L+32*np);		/* offset to first shdr */
		lputl(0L);			/* processor specific flags */
		wputl(52);			/* Ehdr size */
		wputl(32);			/* Phdr size */
		wputl(np);			/* # of Phdrs */
		wputl(40);			/* Shdr size */
		if (!debug['s'])
			wputl(7);			/* # of Shdrs */
		else
			wputl(5);			/* # of Shdrs */
		wputl(4);			/* Shdr with strings */

		fo = 0;
		va = INITTEXT & ~((vlong)INITRND - 1);
		w = HEADR+textsize;

		linuxphdr(1,			/* text - type = PT_LOAD */
			1L+4L,			/* text - flags = PF_X+PF_R */
			0,			/* file offset */
			va,			/* vaddr */
			va,			/* paddr */
			w,			/* file size */
			w,			/* memory size */
			INITRND);		/* alignment */

		fo = rnd(fo+w, INITRND);
		va = rnd(va+w, INITRND);
		w = datsize;

		linuxphdr(1,			/* data - type = PT_LOAD */
			2L+4L,			/* data - flags = PF_W+PF_R */
			fo,			/* file offset */
			va,			/* vaddr */
			va,			/* paddr */
			w,			/* file size */
			w+bsssize,		/* memory size */
			INITRND);		/* alignment */

		if(!debug['s']) {
			linuxphdr(1,			/* data - type = PT_LOAD */
				2L+4L,			/* data - flags = PF_W+PF_R */
				symo,		/* file offset */
				symdatva,			/* vaddr */
				symdatva,			/* paddr */
				8+symsize+lcsize,			/* file size */
				8+symsize+lcsize,		/* memory size */
				INITRND);		/* alignment */
		}

		linuxphdr(0x6474e551,		/* gok - type = gok */
			1L+2L+4L,		/* gok - flags = PF_X+PF_W+PF_R */
			0,			/* file offset */
			0,			/* vaddr */
			0,			/* paddr */
			0,			/* file size */
			0,			/* memory size */
			8);			/* alignment */

		linuxshdr(nil,			/* name */
			0,			/* type */
			0,			/* flags */
			0,			/* addr */
			0,			/* off */
			0,			/* size */
			0,			/* link */
			0,			/* info */
			0,			/* align */
			0);			/* entsize */

		stroffset = 1;  /* 0 means no name, so start at 1 */
		fo = HEADR;
		va = (INITTEXT & ~((vlong)INITRND - 1)) + HEADR;
		w = textsize;

		linuxshdr(".text",		/* name */
			1,			/* type */
			6,			/* flags */
			va,			/* addr */
			fo,			/* off */
			w,			/* size */
			0,			/* link */
			0,			/* info */
			8,			/* align */
			0);			/* entsize */

		fo = rnd(fo+w, INITRND);
		va = rnd(va+w, INITRND);
		w = datsize;

		linuxshdr(".data",		/* name */
			1,			/* type */
			3,			/* flags */
			va,			/* addr */
			fo,			/* off */
			w,			/* size */
			0,			/* link */
			0,			/* info */
			8,			/* align */
			0);			/* entsize */

		fo += w;
		va += w;
		w = bsssize;

		linuxshdr(".bss",		/* name */
			8,			/* type */
			3,			/* flags */
			va,			/* addr */
			fo,			/* off */
			w,			/* size */
			0,			/* link */
			0,			/* info */
			8,			/* align */
			0);			/* entsize */

		w = strtabsize;

		linuxshdr(".shstrtab",		/* name */
			3,			/* type */
			0,			/* flags */
			0,			/* addr */
			fo,			/* off */
			w,			/* size */
			0,			/* link */
			0,			/* info */
			1,			/* align */
			0);			/* entsize */

		if (debug['s'])
			break;

		fo = symo+8;
		w = symsize;

		linuxshdr(".gosymtab",		/* name */
			1,			/* type 1 = SHT_PROGBITS */
			0,			/* flags */
			0,			/* addr */
			fo,			/* off */
			w,			/* size */
			0,			/* link */
			0,			/* info */
			1,			/* align */
			24);			/* entsize */

		fo += w;
		w = lcsize;

		linuxshdr(".gopclntab",		/* name */
			1,			/* type 1 = SHT_PROGBITS*/
			0,			/* flags */
			0,			/* addr */
			fo,			/* off */
			w,			/* size */
			0,			/* link */
			0,			/* info */
			1,			/* align */
			24);			/* entsize */
		break;
	}
	cflush();
	if(debug['c']){
		print("textsize=%ld\n", textsize);
		print("datsize=%ld\n", datsize);
		print("bsssize=%ld\n", bsssize);
		print("symsize=%ld\n", symsize);
		print("lcsize=%ld\n", lcsize);
		print("total=%ld\n", textsize+datsize+bsssize+symsize+lcsize);
	}
}

void
strnput(char *s, int n)
{
	for(; *s; s++){
		cput(*s);
		n--;
	}
	for(; n > 0; n--)
		cput(0);
}

void
cput(int c)
{
	cbp[0] = c;
	cbp++;
	cbc--;
	if(cbc <= 0)
		cflush();
}

/*
void
cput(int32 c)
{
	*cbp++ = c;
	if(--cbc <= 0)
		cflush();
}
*/

void
wput(int32 l)
{

	cbp[0] = l>>8;
	cbp[1] = l;
	cbp += 2;
	cbc -= 2;
	if(cbc <= 0)
		cflush();
}

void
wputl(ushort w)
{
	cput(w);
	cput(w>>8);
}


void
hput(int32 l)
{

	cbp[0] = l>>8;
	cbp[1] = l;
	cbp += 2;
	cbc -= 2;
	if(cbc <= 0)
		cflush();
}

void
lput(int32 l)
{

	cbp[0] = l>>24;
	cbp[1] = l>>16;
	cbp[2] = l>>8;
	cbp[3] = l;
	cbp += 4;
	cbc -= 4;
	if(cbc <= 0)
		cflush();
}

void
lputl(int32 l)
{

	cbp[3] = l>>24;
	cbp[2] = l>>16;
	cbp[1] = l>>8;
	cbp[0] = l;
	cbp += 4;
	cbc -= 4;
	if(cbc <= 0)
		cflush();
}

void
cflush(void)
{
	int n;

	/* no bug if cbc < 0 since obuf(cbuf) followed by ibuf in buf! */
	n = sizeof(buf.cbuf) - cbc;
	if(n)
		write(cout, buf.cbuf, n);
	cbp = buf.cbuf;
	cbc = sizeof(buf.cbuf);
}

void
nopstat(char *f, Count *c)
{
	if(c->outof)
	Bprint(&bso, "%s delay %ld/%ld (%.2f)\n", f,
		c->outof - c->count, c->outof,
		(double)(c->outof - c->count)/c->outof);
}

void
asmsym(void)
{
	Prog *p;
	Auto *a;
	Sym *s;
	int h;

	s = lookup("etext", 0);
	if(s->type == STEXT)
		putsymb(s->name, 'T', s->value, s->version);

	for(h=0; h<NHASH; h++)
		for(s=hash[h]; s!=S; s=s->link)
			switch(s->type) {
			case SCONST:
				putsymb(s->name, 'D', s->value, s->version);
				continue;

			case SDATA:
				putsymb(s->name, 'D', s->value+INITDAT, s->version);
				continue;

			case SBSS:
				putsymb(s->name, 'B', s->value+INITDAT, s->version);
				continue;

			case SSTRING:
				putsymb(s->name, 'T', s->value, s->version);
				continue;

			case SFILE:
				putsymb(s->name, 'f', s->value, s->version);
				continue;
			}

	for(p=textp; p!=P; p=p->cond) {
		s = p->from.sym;
		if(s->type != STEXT && s->type != SLEAF)
			continue;

		/* filenames first */
		for(a=p->to.autom; a; a=a->link)
			if(a->type == D_FILE)
				putsymb(a->asym->name, 'z', a->aoffset, 0);
			else
			if(a->type == D_FILE1)
				putsymb(a->asym->name, 'Z', a->aoffset, 0);

		if(s->type == STEXT)
			putsymb(s->name, 'T', s->value, s->version);
		else
			putsymb(s->name, 'L', s->value, s->version);

		/* frame, auto and param after */
		putsymb(".frame", 'm', p->to.offset+4, 0);
		for(a=p->to.autom; a; a=a->link)
			if(a->type == D_AUTO)
				putsymb(a->asym->name, 'a', -a->aoffset, 0);
			else
			if(a->type == D_PARAM)
				putsymb(a->asym->name, 'p', a->aoffset, 0);
	}
	if(debug['v'] || debug['n'])
		Bprint(&bso, "symsize = %lud\n", symsize);
	Bflush(&bso);
}

void
putsymb(char *s, int t, int32 v, int ver)
{
	int i, f;

	if(t == 'f')
		s++;
	lput(v);
	if(ver)
		t += 'a' - 'A';
	cput(t+0x80);			/* 0x80 is variable length */

	if(t == 'Z' || t == 'z') {
		cput(s[0]);
		for(i=1; s[i] != 0 || s[i+1] != 0; i += 2) {
			cput(s[i]);
			cput(s[i+1]);
		}
		cput(0);
		cput(0);
		i++;
	}
	else {
		for(i=0; s[i]; i++)
			cput(s[i]);
		cput(0);
	}
	symsize += 4 + 1 + i + 1;

	if(debug['n']) {
		if(t == 'z' || t == 'Z') {
			Bprint(&bso, "%c %.8lux ", t, v);
			for(i=1; s[i] != 0 || s[i+1] != 0; i+=2) {
				f = ((s[i]&0xff) << 8) | (s[i+1]&0xff);
				Bprint(&bso, "/%x", f);
			}
			Bprint(&bso, "\n");
			return;
		}
		if(ver)
			Bprint(&bso, "%c %.8lux %s<%d>\n", t, v, s, ver);
		else
			Bprint(&bso, "%c %.8lux %s\n", t, v, s);
	}
}

#define	MINLC	4
void
asmlc(void)
{
	int32 oldpc, oldlc;
	Prog *p;
	int32 v, s;

	oldpc = INITTEXT;
	oldlc = 0;
	for(p = firstp; p != P; p = p->link) {
		setarch(p);
		if(p->line == oldlc || p->as == ATEXT || p->as == ANOP) {
			if(p->as == ATEXT)
				curtext = p;
			if(debug['L'])
				Bprint(&bso, "%6lux %P\n",
					p->pc, p);
			continue;
		}
		if(debug['L'])
			Bprint(&bso, "\t\t%6ld", lcsize);
		v = (p->pc - oldpc) / MINLC;
		while(v) {
			s = 127;
			if(v < 127)
				s = v;
			cput(s+128);	/* 129-255 +pc */
			if(debug['L'])
				Bprint(&bso, " pc+%ld*%d(%ld)", s, MINLC, s+128);
			v -= s;
			lcsize++;
		}
		s = p->line - oldlc;
		oldlc = p->line;
		oldpc = p->pc + MINLC;
		if(s > 64 || s < -64) {
			cput(0);	/* 0 vv +lc */
			cput(s>>24);
			cput(s>>16);
			cput(s>>8);
			cput(s);
			if(debug['L']) {
				if(s > 0)
					Bprint(&bso, " lc+%ld(%d,%ld)\n",
						s, 0, s);
				else
					Bprint(&bso, " lc%ld(%d,%ld)\n",
						s, 0, s);
				Bprint(&bso, "%6lux %P\n",
					p->pc, p);
			}
			lcsize += 5;
			continue;
		}
		if(s > 0) {
			cput(0+s);	/* 1-64 +lc */
			if(debug['L']) {
				Bprint(&bso, " lc+%ld(%ld)\n", s, 0+s);
				Bprint(&bso, "%6lux %P\n",
					p->pc, p);
			}
		} else {
			cput(64-s);	/* 65-128 -lc */
			if(debug['L']) {
				Bprint(&bso, " lc%ld(%ld)\n", s, 64-s);
				Bprint(&bso, "%6lux %P\n",
					p->pc, p);
			}
		}
		lcsize++;
	}
	while(lcsize & 1) {
		s = 129;
		cput(s);
		lcsize++;
	}
	if(debug['v'] || debug['L'])
		Bprint(&bso, "lcsize = %ld\n", lcsize);
	Bflush(&bso);
}

static void
outt(int32 f, int32 l)
{
	if(debug['L'])
		Bprint(&bso, "tmap: %lux-%lux\n", f, l);
	lput(f);
	lput(l);
}

void
asmthumbmap(void)
{
	int32 pc, lastt;
	Prog *p;

	if(!seenthumb)
		return;
	pc = 0;
	lastt = -1;
	for(p = firstp; p != P; p = p->link){
		pc = p->pc - INITTEXT;
		if(p->as == ATEXT){
			setarch(p);
			if(thumb){
				if(p->from.sym->foreign){	// 8 bytes of ARM first
					if(lastt >= 0){
						outt(lastt, pc-1);
						lastt = -1;
					}
					pc += 8;
				}
				if(lastt < 0)
					lastt = pc;
			}
			else{
				if(p->from.sym->foreign){	// 4 bytes of THUMB first
					if(lastt < 0)
						lastt = pc;
					pc += 4;
				}
				if(lastt >= 0){
					outt(lastt, pc-1);
					lastt = -1;
				}
			}
		}
	}
	if(lastt >= 0)
		outt(lastt, pc+1);
}

void
datblk(int32 s, int32 n, int str)
{
	Sym *v;
	Prog *p;
	char *cast;
	int32 a, l, fl, j, d;
	int i, c;

	memset(buf.dbuf, 0, n+100);
	for(p = datap; p != P; p = p->link) {
		if(str != (p->from.sym->type == SSTRING))
			continue;
		curp = p;
		a = p->from.sym->value + p->from.offset;
		l = a - s;
		c = p->reg;
		i = 0;
		if(l < 0) {
			if(l+c <= 0)
				continue;
			while(l < 0) {
				l++;
				i++;
			}
		}
		if(l >= n)
			continue;
		if(p->as != AINIT && p->as != ADYNT) {
			for(j=l+(c-i)-1; j>=l; j--)
				if(buf.dbuf[j]) {
					print("%P\n", p);
					diag("multiple initialization");
					break;
				}
		}
		switch(p->to.type) {
		default:
			diag("unknown mode in initialization%P", p);
			break;

		case D_FCONST:
			switch(c) {
			default:
			case 4:
				fl = ieeedtof(p->to.ieee);
				cast = (char*)&fl;
				for(; i<c; i++) {
					buf.dbuf[l] = cast[fnuxi4[i]];
					l++;
				}
				break;
			case 8:
				cast = (char*)p->to.ieee;
				for(; i<c; i++) {
					buf.dbuf[l] = cast[fnuxi8[i]];
					l++;
				}
				break;
			}
			break;

		case D_SCONST:
			for(; i<c; i++) {
				buf.dbuf[l] = p->to.sval[i];
				l++;
			}
			break;

		case D_CONST:
			d = p->to.offset;
			v = p->to.sym;
			if(v) {
				switch(v->type) {
				case SUNDEF:
					ckoff(v, d);
					d += v->value;
					break;
				case STEXT:
				case SLEAF:
					d += v->value;
#ifdef CALLEEBX
					d += fnpinc(v);
#else
					if(v->thumb)
						d++;		// T bit
#endif
					break;
				case SSTRING:
					d += v->value;
					break;
				case SDATA:
				case SBSS:
					d += v->value + INITDAT;
					break;
				}
				if(dlm)
					dynreloc(v, a+INITDAT, 1);
			}
			cast = (char*)&d;
			switch(c) {
			default:
				diag("bad nuxi %d %d%P", c, i, curp);
				break;
			case 1:
				for(; i<c; i++) {
					buf.dbuf[l] = cast[inuxi1[i]];
					l++;
				}
				break;
			case 2:
				for(; i<c; i++) {
					buf.dbuf[l] = cast[inuxi2[i]];
					l++;
				}
				break;
			case 4:
				for(; i<c; i++) {
					buf.dbuf[l] = cast[inuxi4[i]];
					l++;
				}
				break;
			}
			break;
		}
	}
	write(cout, buf.dbuf, n);
}

void
asmout(Prog *p, Optab *o)
{
	int32 o1, o2, o3, o4, o5, o6, v;
	int r, rf, rt, rt2;
	Sym *s;

PP = p;
	o1 = 0;
	o2 = 0;
	o3 = 0;
	o4 = 0;
	o5 = 0;
	o6 = 0;
	armsize += o->size;
if(debug['P']) print("%ulx: %P	type %d\n", (uint32)(p->pc), p, o->type);
	switch(o->type) {
	default:
		diag("unknown asm %d", o->type);
		prasm(p);
		break;

	case 0:		/* pseudo ops */
if(debug['G']) print("%ulx: %s: arm %d %d %d %d\n", (uint32)(p->pc), p->from.sym->name, p->from.sym->thumb, p->from.sym->foreign, p->from.sym->fnptr, p->from.sym->used);
		break;

	case 1:		/* op R,[R],R */
		o1 = oprrr(p->as, p->scond);
		rf = p->from.reg;
		rt = p->to.reg;
		r = p->reg;
		if(p->to.type == D_NONE)
			rt = 0;
		if(p->as == AMOVW || p->as == AMVN)
			r = 0;
		else if(r == NREG)
			r = rt;
		o1 |= rf | (r<<16) | (rt<<12);
		break;

	case 2:		/* movbu $I,[R],R */
		aclass(&p->from);
		o1 = oprrr(p->as, p->scond);
		o1 |= immrot(instoffset);
		rt = p->to.reg;
		r = p->reg;
		if(p->to.type == D_NONE)
			rt = 0;
		if(p->as == AMOVW || p->as == AMVN)
			r = 0;
		else if(r == NREG)
			r = rt;
		o1 |= (r<<16) | (rt<<12);
		break;

	case 3:		/* add R<<[IR],[R],R */
	mov:
		aclass(&p->from);
		o1 = oprrr(p->as, p->scond);
		o1 |= p->from.offset;
		rt = p->to.reg;
		r = p->reg;
		if(p->to.type == D_NONE)
			rt = 0;
		if(p->as == AMOVW || p->as == AMVN)
			r = 0;
		else if(r == NREG)
			r = rt;
		o1 |= (r<<16) | (rt<<12);
		break;

	case 4:		/* add $I,[R],R */
		aclass(&p->from);
		o1 = oprrr(AADD, p->scond);
		o1 |= immrot(instoffset);
		r = p->from.reg;
		if(r == NREG)
			r = o->param;
		o1 |= r << 16;
		o1 |= p->to.reg << 12;
		break;

	case 5:		/* bra s */
		v = -8;
		if(p->cond == UP) {
			s = p->to.sym;
			if(s->type != SUNDEF)
				diag("bad branch sym type");
			v = (uint32)s->value >> (Roffset-2);
			dynreloc(s, p->pc, 0);
		}
		else if(p->cond != P)
			v = (p->cond->pc - pc) - 8;
#ifdef CALLEEBX
		if(p->as == ABL)
			v += fninc(p->to.sym);
#endif
		o1 = opbra(p->as, p->scond);
		o1 |= (v >> 2) & 0xffffff;
		break;

	case 6:		/* b ,O(R) -> add $O,R,PC */
		aclass(&p->to);
		o1 = oprrr(AADD, p->scond);
		o1 |= immrot(instoffset);
		o1 |= p->to.reg << 16;
		o1 |= REGPC << 12;
		break;

	case 7:		/* bl ,O(R) -> mov PC,link; add $O,R,PC */
		aclass(&p->to);
		o1 = oprrr(AADD, p->scond);
		o1 |= immrot(0);
		o1 |= REGPC << 16;
		o1 |= REGLINK << 12;

		o2 = oprrr(AADD, p->scond);
		o2 |= immrot(instoffset);
		o2 |= p->to.reg << 16;
		o2 |= REGPC << 12;
		break;

	case 8:		/* sll $c,[R],R -> mov (R<<$c),R */
		aclass(&p->from);
		o1 = oprrr(p->as, p->scond);
		r = p->reg;
		if(r == NREG)
			r = p->to.reg;
		o1 |= r;
		o1 |= (instoffset&31) << 7;
		o1 |= p->to.reg << 12;
		break;

	case 9:		/* sll R,[R],R -> mov (R<<R),R */
		o1 = oprrr(p->as, p->scond);
		r = p->reg;
		if(r == NREG)
			r = p->to.reg;
		o1 |= r;
		o1 |= (p->from.reg << 8) | (1<<4);
		o1 |= p->to.reg << 12;
		break;

	case 10:	/* swi [$con] */
		o1 = oprrr(p->as, p->scond);
		if(p->to.type != D_NONE) {
			aclass(&p->to);
			o1 |= instoffset & 0xffffff;
		}
		break;

	case 11:	/* word */
		switch(aclass(&p->to)) {
		case C_LCON:
			if(!dlm)
				break;
			if(p->to.name != D_EXTERN && p->to.name != D_STATIC)
				break;
		case C_ADDR:
			if(p->to.sym->type == SUNDEF)
				ckoff(p->to.sym, p->to.offset);
			dynreloc(p->to.sym, p->pc, 1);
		}
		o1 = instoffset;
		break;

	case 12:	/* movw $lcon, reg */
		o1 = omvl(p, &p->from, p->to.reg);
		break;

	case 13:	/* op $lcon, [R], R */
		o1 = omvl(p, &p->from, REGTMP);
		if(!o1)
			break;
		o2 = oprrr(p->as, p->scond);
		o2 |= REGTMP;
		r = p->reg;
		if(p->as == AMOVW || p->as == AMVN)
			r = 0;
		else if(r == NREG)
			r = p->to.reg;
		o2 |= r << 16;
		if(p->to.type != D_NONE)
			o2 |= p->to.reg << 12;
		break;

	case 14:	/* movb/movbu/movh/movhu R,R */
		o1 = oprrr(ASLL, p->scond);

		if(p->as == AMOVBU || p->as == AMOVHU)
			o2 = oprrr(ASRL, p->scond);
		else
			o2 = oprrr(ASRA, p->scond);

		r = p->to.reg;
		o1 |= (p->from.reg)|(r<<12);
		o2 |= (r)|(r<<12);
		if(p->as == AMOVB || p->as == AMOVBU) {
			o1 |= (24<<7);
			o2 |= (24<<7);
		} else {
			o1 |= (16<<7);
			o2 |= (16<<7);
		}
		break;

	case 15:	/* mul r,[r,]r */
		o1 = oprrr(p->as, p->scond);
		rf = p->from.reg;
		rt = p->to.reg;
		r = p->reg;
		if(r == NREG)
			r = rt;
		if(rt == r) {
			r = rf;
			rf = rt;
		}
		if(0)
		if(rt == r || rf == REGPC || r == REGPC || rt == REGPC) {
			diag("bad registers in MUL");
			prasm(p);
		}
		o1 |= (rf<<8) | r | (rt<<16);
		break;


	case 16:	/* div r,[r,]r */
		o1 = 0xf << 28;
		o2 = 0;
		break;

	case 17:
		o1 = oprrr(p->as, p->scond);
		rf = p->from.reg;
		rt = p->to.reg;
		rt2 = p->to.offset;
		r = p->reg;
		o1 |= (rf<<8) | r | (rt<<16) | (rt2<<12);
		break;

	case 20:	/* mov/movb/movbu R,O(R) */
		aclass(&p->to);
		r = p->to.reg;
		if(r == NREG)
			r = o->param;
		o1 = osr(p->as, p->from.reg, instoffset, r, p->scond);
		break;

	case 21:	/* mov/movbu O(R),R -> lr */
		aclass(&p->from);
		r = p->from.reg;
		if(r == NREG)
			r = o->param;
		o1 = olr(instoffset, r, p->to.reg, p->scond);
		if(p->as != AMOVW)
			o1 |= 1<<22;
		break;

	case 22:	/* movb/movh/movhu O(R),R -> lr,shl,shr */
		aclass(&p->from);
		r = p->from.reg;
		if(r == NREG)
			r = o->param;
		o1 = olr(instoffset, r, p->to.reg, p->scond);

		o2 = oprrr(ASLL, p->scond);
		o3 = oprrr(ASRA, p->scond);
		r = p->to.reg;
		if(p->as == AMOVB) {
			o2 |= (24<<7)|(r)|(r<<12);
			o3 |= (24<<7)|(r)|(r<<12);
		} else {
			o2 |= (16<<7)|(r)|(r<<12);
			if(p->as == AMOVHU)
				o3 = oprrr(ASRL, p->scond);
			o3 |= (16<<7)|(r)|(r<<12);
		}
		break;

	case 23:	/* movh/movhu R,O(R) -> sb,sb */
		aclass(&p->to);
		r = p->to.reg;
		if(r == NREG)
			r = o->param;
		o1 = osr(AMOVH, p->from.reg, instoffset, r, p->scond);

		o2 = oprrr(ASRL, p->scond);
		o2 |= (8<<7)|(p->from.reg)|(REGTMP<<12);

		o3 = osr(AMOVH, REGTMP, instoffset+1, r, p->scond);
		break;

	case 30:	/* mov/movb/movbu R,L(R) */
		o1 = omvl(p, &p->to, REGTMP);
		if(!o1)
			break;
		r = p->to.reg;
		if(r == NREG)
			r = o->param;
		o2 = osrr(p->from.reg, REGTMP,r, p->scond);
		if(p->as != AMOVW)
			o2 |= 1<<22;
		break;

	case 31:	/* mov/movbu L(R),R -> lr[b] */
	case 32:	/* movh/movb L(R),R -> lr[b] */
		o1 = omvl(p, &p->from, REGTMP);
		if(!o1)
			break;
		r = p->from.reg;
		if(r == NREG)
			r = o->param;
		o2 = olrr(REGTMP,r, p->to.reg, p->scond);
		if(p->as == AMOVBU || p->as == AMOVB)
			o2 |= 1<<22;
		if(o->type == 31)
			break;

		o3 = oprrr(ASLL, p->scond);

		if(p->as == AMOVBU || p->as == AMOVHU)
			o4 = oprrr(ASRL, p->scond);
		else
			o4 = oprrr(ASRA, p->scond);

		r = p->to.reg;
		o3 |= (r)|(r<<12);
		o4 |= (r)|(r<<12);
		if(p->as == AMOVB || p->as == AMOVBU) {
			o3 |= (24<<7);
			o4 |= (24<<7);
		} else {
			o3 |= (16<<7);
			o4 |= (16<<7);
		}
		break;

	case 33:	/* movh/movhu R,L(R) -> sb, sb */
		o1 = omvl(p, &p->to, REGTMP);
		if(!o1)
			break;
		r = p->to.reg;
		if(r == NREG)
			r = o->param;
		o2 = osrr(p->from.reg, REGTMP, r, p->scond);
		o2 |= (1<<22) ;

		o3 = oprrr(ASRL, p->scond);
		o3 |= (8<<7)|(p->from.reg)|(p->from.reg<<12);
		o3 |= (1<<6);	/* ROR 8 */

		o4 = oprrr(AADD, p->scond);
		o4 |= (REGTMP << 12) | (REGTMP << 16);
		o4 |= immrot(1);

		o5 = osrr(p->from.reg, REGTMP,r,p->scond);
		o5 |= (1<<22);

		o6 = oprrr(ASRL, p->scond);
		o6 |= (24<<7)|(p->from.reg)|(p->from.reg<<12);
		o6 |= (1<<6);	/* ROL 8 */

		break;
		
	case 34:	/* mov $lacon,R */
		o1 = omvl(p, &p->from, REGTMP);
		if(!o1)
			break;

		o2 = oprrr(AADD, p->scond);
		o2 |= REGTMP;
		r = p->from.reg;
		if(r == NREG)
			r = o->param;
		o2 |= r << 16;
		if(p->to.type != D_NONE)
			o2 |= p->to.reg << 12;
		break;

	case 35:	/* mov PSR,R */
		o1 = (2<<23) | (0xf<<16) | (0<<0);
		o1 |= (p->scond & C_SCOND) << 28;
		o1 |= (p->from.reg & 1) << 22;
		o1 |= p->to.reg << 12;
		break;

	case 36:	/* mov R,PSR */
		o1 = (2<<23) | (0x29f<<12) | (0<<4);
		if(p->scond & C_FBIT)
			o1 ^= 0x010 << 12;
		o1 |= (p->scond & C_SCOND) << 28;
		o1 |= (p->to.reg & 1) << 22;
		o1 |= p->from.reg << 0;
		break;

	case 37:	/* mov $con,PSR */
		aclass(&p->from);
		o1 = (2<<23) | (0x29f<<12) | (0<<4);
		if(p->scond & C_FBIT)
			o1 ^= 0x010 << 12;
		o1 |= (p->scond & C_SCOND) << 28;
		o1 |= immrot(instoffset);
		o1 |= (p->to.reg & 1) << 22;
		o1 |= p->from.reg << 0;
		break;

	case 38:	/* movm $con,oreg -> stm */
		o1 = (0x4 << 25);
		o1 |= p->from.offset & 0xffff;
		o1 |= p->to.reg << 16;
		aclass(&p->to);
		goto movm;

	case 39:	/* movm oreg,$con -> ldm */
		o1 = (0x4 << 25) | (1 << 20);
		o1 |= p->to.offset & 0xffff;
		o1 |= p->from.reg << 16;
		aclass(&p->from);
	movm:
		if(instoffset != 0)
			diag("offset must be zero in MOVM");
		o1 |= (p->scond & C_SCOND) << 28;
		if(p->scond & C_PBIT)
			o1 |= 1 << 24;
		if(p->scond & C_UBIT)
			o1 |= 1 << 23;
		if(p->scond & C_SBIT)
			o1 |= 1 << 22;
		if(p->scond & C_WBIT)
			o1 |= 1 << 21;
		break;

	case 40:	/* swp oreg,reg,reg */
		aclass(&p->from);
		if(instoffset != 0)
			diag("offset must be zero in SWP");
		o1 = (0x2<<23) | (0x9<<4);
		if(p->as != ASWPW)
			o1 |= 1 << 22;
		o1 |= p->from.reg << 16;
		o1 |= p->reg << 0;
		o1 |= p->to.reg << 12;
		o1 |= (p->scond & C_SCOND) << 28;
		break;

	case 41:	/* rfe -> movm.s.w.u 0(r13),[r15] */
		o1 = 0xe8fd8000;
		break;

	case 50:	/* floating point store */
		v = regoff(&p->to);
		r = p->to.reg;
		if(r == NREG)
			r = o->param;
		o1 = ofsr(p->as, p->from.reg, v, r, p->scond, p);
		break;

	case 51:	/* floating point load */
		v = regoff(&p->from);
		r = p->from.reg;
		if(r == NREG)
			r = o->param;
		o1 = ofsr(p->as, p->to.reg, v, r, p->scond, p) | (1<<20);
		break;

	case 52:	/* floating point store, int32 offset UGLY */
		o1 = omvl(p, &p->to, REGTMP);
		if(!o1)
			break;
		r = p->to.reg;
		if(r == NREG)
			r = o->param;
		o2 = oprrr(AADD, p->scond) | (REGTMP << 12) | (REGTMP << 16) | r;
		o3 = ofsr(p->as, p->from.reg, 0, REGTMP, p->scond, p);
		break;

	case 53:	/* floating point load, int32 offset UGLY */
		o1 = omvl(p, &p->from, REGTMP);
		if(!o1)
			break;
		r = p->from.reg;
		if(r == NREG)
			r = o->param;
		o2 = oprrr(AADD, p->scond) | (REGTMP << 12) | (REGTMP << 16) | r;
		o3 = ofsr(p->as, p->to.reg, 0, REGTMP, p->scond, p) | (1<<20);
		break;

	case 54:	/* floating point arith */
		o1 = oprrr(p->as, p->scond);
		if(p->from.type == D_FCONST) {
			rf = chipfloat(p->from.ieee);
			if(rf < 0){
				diag("invalid floating-point immediate\n%P", p);
				rf = 0;
			}
			rf |= (1<<3);
		} else
			rf = p->from.reg;
		rt = p->to.reg;
		r = p->reg;
		if(p->to.type == D_NONE)
			rt = 0;	/* CMP[FD] */
		else if(o1 & (1<<15))
			r = 0;	/* monadic */
		else if(r == NREG)
			r = rt;
		o1 |= rf | (r<<16) | (rt<<12);
		break;

	case 55:	/* floating point fix and float */
		o1 = oprrr(p->as, p->scond);
		rf = p->from.reg;
		rt = p->to.reg;
		if(p->to.type == D_NONE){
			rt = 0;
			diag("to.type==D_NONE (asm/fp)");
		}
		if(p->from.type == D_REG)
			o1 |= (rf<<12) | (rt<<16);
		else
			o1 |= rf | (rt<<12);
		break;

	case 56:	/* move to FP[CS]R */
		o1 = ((p->scond & C_SCOND) << 28) | (0xe << 24) | (1<<8) | (1<<4);
		o1 |= ((p->to.reg+1)<<21) | (p->from.reg << 12);
		break;

	case 57:	/* move from FP[CS]R */
		o1 = ((p->scond & C_SCOND) << 28) | (0xe << 24) | (1<<8) | (1<<4);
		o1 |= ((p->from.reg+1)<<21) | (p->to.reg<<12) | (1<<20);
		break;
	case 58:	/* movbu R,R */
		o1 = oprrr(AAND, p->scond);
		o1 |= immrot(0xff);
		rt = p->to.reg;
		r = p->from.reg;
		if(p->to.type == D_NONE)
			rt = 0;
		if(r == NREG)
			r = rt;
		o1 |= (r<<16) | (rt<<12);
		break;

	case 59:	/* movw/bu R<<I(R),R -> ldr indexed */
		if(p->from.reg == NREG) {
			if(p->as != AMOVW)
				diag("byte MOV from shifter operand");
			goto mov;
		}
		if(p->from.offset&(1<<4))
			diag("bad shift in LDR");
		o1 = olrr(p->from.offset, p->from.reg, p->to.reg, p->scond);
		if(p->as == AMOVBU)
			o1 |= 1<<22;
		break;

	case 60:	/* movb R(R),R -> ldrsb indexed */
		if(p->from.reg == NREG) {
			diag("byte MOV from shifter operand");
			goto mov;
		}
		if(p->from.offset&(~0xf))
			diag("bad shift in LDRSB");
		o1 = olhrr(p->from.offset, p->from.reg, p->to.reg, p->scond);
		o1 ^= (1<<5)|(1<<6);
		break;

	case 61:	/* movw/b/bu R,R<<[IR](R) -> str indexed */
		if(p->to.reg == NREG)
			diag("MOV to shifter operand");
		o1 = osrr(p->from.reg, p->to.offset, p->to.reg, p->scond);
		if(p->as == AMOVB || p->as == AMOVBU)
			o1 |= 1<<22;
		break;

	case 62:	/* case R -> movw	R<<2(PC),PC */
		o1 = olrr(p->from.reg, REGPC, REGPC, p->scond);
		o1 |= 2<<7;
		break;

	case 63:	/* bcase */
		if(p->cond != P) {
			o1 = p->cond->pc;
			if(dlm)
				dynreloc(S, p->pc, 1);
		}
		break;

	/* reloc ops */
	case 64:	/* mov/movb/movbu R,addr */
		o1 = omvl(p, &p->to, REGTMP);
		if(!o1)
			break;
		o2 = osr(p->as, p->from.reg, 0, REGTMP, p->scond);
		break;

	case 65:	/* mov/movbu addr,R */
	case 66:	/* movh/movhu/movb addr,R */
		o1 = omvl(p, &p->from, REGTMP);
		if(!o1)
			break;
		o2 = olr(0, REGTMP, p->to.reg, p->scond);
		if(p->as == AMOVBU || p->as == AMOVB)
			o2 |= 1<<22;
		if(o->type == 65)
			break;

		o3 = oprrr(ASLL, p->scond);

		if(p->as == AMOVBU || p->as == AMOVHU)
			o4 = oprrr(ASRL, p->scond);
		else
			o4 = oprrr(ASRA, p->scond);

		r = p->to.reg;
		o3 |= (r)|(r<<12);
		o4 |= (r)|(r<<12);
		if(p->as == AMOVB || p->as == AMOVBU) {
			o3 |= (24<<7);
			o4 |= (24<<7);
		} else {
			o3 |= (16<<7);
			o4 |= (16<<7);
		}
		break;

	case 67:	/* movh/movhu R,addr -> sb, sb */
		o1 = omvl(p, &p->to, REGTMP);
		if(!o1)
			break;
		o2 = osr(p->as, p->from.reg, 0, REGTMP, p->scond);

		o3 = oprrr(ASRL, p->scond);
		o3 |= (8<<7)|(p->from.reg)|(p->from.reg<<12);
		o3 |= (1<<6);	/* ROR 8 */

		o4 = oprrr(AADD, p->scond);
		o4 |= (REGTMP << 12) | (REGTMP << 16);
		o4 |= immrot(1);

		o5 = osr(p->as, p->from.reg, 0, REGTMP, p->scond);

		o6 = oprrr(ASRL, p->scond);
		o6 |= (24<<7)|(p->from.reg)|(p->from.reg<<12);
		o6 |= (1<<6);	/* ROL 8 */
		break;

	case 68:	/* floating point store -> ADDR */
		o1 = omvl(p, &p->to, REGTMP);
		if(!o1)
			break;
		o2 = ofsr(p->as, p->from.reg, 0, REGTMP, p->scond, p);
		break;

	case 69:	/* floating point load <- ADDR */
		o1 = omvl(p, &p->from, REGTMP);
		if(!o1)
			break;
		o2 = ofsr(p->as, p->to.reg, 0, REGTMP, p->scond, p) | (1<<20);
		break;

	/* ArmV4 ops: */
	case 70:	/* movh/movhu R,O(R) -> strh */
		aclass(&p->to);
		r = p->to.reg;
		if(r == NREG)
			r = o->param;
		o1 = oshr(p->from.reg, instoffset, r, p->scond);
		break;	
	case 71:	/* movb/movh/movhu O(R),R -> ldrsb/ldrsh/ldrh */
		aclass(&p->from);
		r = p->from.reg;
		if(r == NREG)
			r = o->param;
		o1 = olhr(instoffset, r, p->to.reg, p->scond);
		if(p->as == AMOVB)
			o1 ^= (1<<5)|(1<<6);
		else if(p->as == AMOVH)
			o1 ^= (1<<6);
		break;
	case 72:	/* movh/movhu R,L(R) -> strh */
		o1 = omvl(p, &p->to, REGTMP);
		if(!o1)
			break;
		r = p->to.reg;
		if(r == NREG)
			r = o->param;
		o2 = oshrr(p->from.reg, REGTMP,r, p->scond);
		break;	
	case 73:	/* movb/movh/movhu L(R),R -> ldrsb/ldrsh/ldrh */
		o1 = omvl(p, &p->from, REGTMP);
		if(!o1)
			break;
		r = p->from.reg;
		if(r == NREG)
			r = o->param;
		o2 = olhrr(REGTMP, r, p->to.reg, p->scond);
		if(p->as == AMOVB)
			o2 ^= (1<<5)|(1<<6);
		else if(p->as == AMOVH)
			o2 ^= (1<<6);
		break;
	case 74:	/* bx $I */
#ifdef CALLEEBX
		diag("bx $i case (arm)");
#endif
		if(!seenthumb)
			diag("ABX $I and seenthumb==0");
		v = p->cond->pc;
		if(p->to.sym->thumb)
			v |= 1;	// T bit
		o1 = olr(8, REGPC, REGTMP, p->scond&C_SCOND);	// mov 8(PC), Rtmp
		o2 = 	oprrr(AADD, p->scond) | immrot(8) | (REGPC<<16) | (REGLINK<<12);	// add 8,PC, LR
		o3 = ((p->scond&C_SCOND)<<28) | (0x12fff<<8) | (1<<4) | REGTMP;		// bx Rtmp
		o4 = opbra(AB, 14);	// B over o6
		o5 = v;
		break;
	case 75:	/* bx O(R) */
		aclass(&p->to);
		if(instoffset != 0)
			diag("non-zero offset in ABX");
/*
		o1 = 	oprrr(AADD, p->scond) | immrot(0) | (REGPC<<16) | (REGLINK<<12);	// mov PC, LR
		o2 = ((p->scond&C_SCOND)<<28) | (0x12fff<<8) | (1<<4) | p->to.reg;		// BX R
*/
		// p->to.reg may be REGLINK
		o1 = oprrr(AADD, p->scond);
		o1 |= immrot(instoffset);
		o1 |= p->to.reg << 16;
		o1 |= REGTMP << 12;
		o2 = 	oprrr(AADD, p->scond) | immrot(0) | (REGPC<<16) | (REGLINK<<12);	// mov PC, LR
		o3 = ((p->scond&C_SCOND)<<28) | (0x12fff<<8) | (1<<4) | REGTMP;		// BX Rtmp
		break;
	case 76:	/* bx O(R) when returning from fn*/
		if(!seenthumb)
			diag("ABXRET and seenthumb==0");
		aclass(&p->to);
// print("ARM BXRET %d(R%d)\n", instoffset, p->to.reg);
		if(instoffset != 0)
			diag("non-zero offset in ABXRET");
		// o1 = olr(instoffset, p->to.reg, REGTMP, p->scond);	// mov O(R), Rtmp
		o1 = ((p->scond&C_SCOND)<<28) | (0x12fff<<8) | (1<<4) | p->to.reg;		// BX R
		break;
	}

	v = p->pc;
	switch(o->size) {
	default:
		if(debug['a'])
			Bprint(&bso, " %.8lux:\t\t%P\n", v, p);
		break;
	case 4:
		if(debug['a'])
			Bprint(&bso, " %.8lux: %.8lux\t%P\n", v, o1, p);
		lputl(o1);
		break;
	case 8:
		if(debug['a'])
			Bprint(&bso, " %.8lux: %.8lux %.8lux%P\n", v, o1, o2, p);
		lputl(o1);
		lputl(o2);
		break;
	case 12:
		if(debug['a'])
			Bprint(&bso, " %.8lux: %.8lux %.8lux %.8lux%P\n", v, o1, o2, o3, p);
		lputl(o1);
		lputl(o2);
		lputl(o3);
		break;
	case 16:
		if(debug['a'])
			Bprint(&bso, " %.8lux: %.8lux %.8lux %.8lux %.8lux%P\n",
				v, o1, o2, o3, o4, p);
		lputl(o1);
		lputl(o2);
		lputl(o3);
		lputl(o4);
		break;
	case 20:
		if(debug['a'])
			Bprint(&bso, " %.8lux: %.8lux %.8lux %.8lux %.8lux %.8lux%P\n",
				v, o1, o2, o3, o4, o5, p);
		lputl(o1);
		lputl(o2);
		lputl(o3);
		lputl(o4);
		lputl(o5);
		break;
	case 24:
		if(debug['a'])
			Bprint(&bso, " %.8lux: %.8lux %.8lux %.8lux %.8lux %.8lux %.8lux%P\n",
				v, o1, o2, o3, o4, o5, o6, p);
		lputl(o1);
		lputl(o2);
		lputl(o3);
		lputl(o4);
		lputl(o5);
		lputl(o6);
		break;
	}
}

int32
oprrr(int a, int sc)
{
	int32 o;

	o = (sc & C_SCOND) << 28;
	if(sc & C_SBIT)
		o |= 1 << 20;
	if(sc & (C_PBIT|C_WBIT))
		diag(".P/.W on dp instruction");
	switch(a) {
	case AMULU:
	case AMUL:	return o | (0x0<<21) | (0x9<<4);
	case AMULA:	return o | (0x1<<21) | (0x9<<4);
	case AMULLU:	return o | (0x4<<21) | (0x9<<4);
	case AMULL:	return o | (0x6<<21) | (0x9<<4);
	case AMULALU:	return o | (0x5<<21) | (0x9<<4);
	case AMULAL:	return o | (0x7<<21) | (0x9<<4);
	case AAND:	return o | (0x0<<21);
	case AEOR:	return o | (0x1<<21);
	case ASUB:	return o | (0x2<<21);
	case ARSB:	return o | (0x3<<21);
	case AADD:	return o | (0x4<<21);
	case AADC:	return o | (0x5<<21);
	case ASBC:	return o | (0x6<<21);
	case ARSC:	return o | (0x7<<21);
	case ATST:	return o | (0x8<<21) | (1<<20);
	case ATEQ:	return o | (0x9<<21) | (1<<20);
	case ACMP:	return o | (0xa<<21) | (1<<20);
	case ACMN:	return o | (0xb<<21) | (1<<20);
	case AORR:	return o | (0xc<<21);
	case AMOVW:	return o | (0xd<<21);
	case ABIC:	return o | (0xe<<21);
	case AMVN:	return o | (0xf<<21);
	case ASLL:	return o | (0xd<<21) | (0<<5);
	case ASRL:	return o | (0xd<<21) | (1<<5);
	case ASRA:	return o | (0xd<<21) | (2<<5);
	case ASWI:	return o | (0xf<<24);

	case AADDD:	return o | (0xe<<24) | (0x0<<20) | (1<<8) | (1<<7);
	case AADDF:	return o | (0xe<<24) | (0x0<<20) | (1<<8);
	case AMULD:	return o | (0xe<<24) | (0x1<<20) | (1<<8) | (1<<7);
	case AMULF:	return o | (0xe<<24) | (0x1<<20) | (1<<8);
	case ASUBD:	return o | (0xe<<24) | (0x2<<20) | (1<<8) | (1<<7);
	case ASUBF:	return o | (0xe<<24) | (0x2<<20) | (1<<8);
	case ADIVD:	return o | (0xe<<24) | (0x4<<20) | (1<<8) | (1<<7);
	case ADIVF:	return o | (0xe<<24) | (0x4<<20) | (1<<8);
	case ACMPD:
	case ACMPF:	return o | (0xe<<24) | (0x9<<20) | (0xF<<12) | (1<<8) | (1<<4);	/* arguably, ACMPF should expand to RNDF, CMPD */

	case AMOVF:
	case AMOVDF:	return o | (0xe<<24) | (0x0<<20) | (1<<15) | (1<<8);
	case AMOVD:
	case AMOVFD:	return o | (0xe<<24) | (0x0<<20) | (1<<15) | (1<<8) | (1<<7);

	case AMOVWF:	return o | (0xe<<24) | (0<<20) | (1<<8) | (1<<4);
	case AMOVWD:	return o | (0xe<<24) | (0<<20) | (1<<8) | (1<<4) | (1<<7);
	case AMOVFW:	return o | (0xe<<24) | (1<<20) | (1<<8) | (1<<4);
	case AMOVDW:	return o | (0xe<<24) | (1<<20) | (1<<8) | (1<<4) | (1<<7);
	}
	diag("bad rrr %d", a);
	prasm(curp);
	return 0;
}

int32
opbra(int a, int sc)
{

	if(sc & (C_SBIT|C_PBIT|C_WBIT))
		diag(".S/.P/.W on bra instruction");
	sc &= C_SCOND;
	if(a == ABL)
		return (sc<<28)|(0x5<<25)|(0x1<<24);
	if(sc != 0xe)
		diag(".COND on bcond instruction");
	switch(a) {
	case ABEQ:	return (0x0<<28)|(0x5<<25);
	case ABNE:	return (0x1<<28)|(0x5<<25);
	case ABCS:	return (0x2<<28)|(0x5<<25);
	case ABHS:	return (0x2<<28)|(0x5<<25);
	case ABCC:	return (0x3<<28)|(0x5<<25);
	case ABLO:	return (0x3<<28)|(0x5<<25);
	case ABMI:	return (0x4<<28)|(0x5<<25);
	case ABPL:	return (0x5<<28)|(0x5<<25);
	case ABVS:	return (0x6<<28)|(0x5<<25);
	case ABVC:	return (0x7<<28)|(0x5<<25);
	case ABHI:	return (0x8<<28)|(0x5<<25);
	case ABLS:	return (0x9<<28)|(0x5<<25);
	case ABGE:	return (0xa<<28)|(0x5<<25);
	case ABLT:	return (0xb<<28)|(0x5<<25);
	case ABGT:	return (0xc<<28)|(0x5<<25);
	case ABLE:	return (0xd<<28)|(0x5<<25);
	case AB:	return (0xe<<28)|(0x5<<25);
	}
	diag("bad bra %A", a);
	prasm(curp);
	return 0;
}

int32
olr(int32 v, int b, int r, int sc)
{
	int32 o;

	if(sc & C_SBIT)
		diag(".S on LDR/STR instruction");
	o = (sc & C_SCOND) << 28;
	if(!(sc & C_PBIT))
		o |= 1 << 24;
	if(!(sc & C_UBIT))
		o |= 1 << 23;
	if(sc & C_WBIT)
		o |= 1 << 21;
	o |= (0x1<<26) | (1<<20);
	if(v < 0) {
		v = -v;
		o ^= 1 << 23;
	}
	if(v >= (1<<12))
		diag("literal span too large: %d (R%d)\n%P", v, b, PP);
	o |= v;
	o |= b << 16;
	o |= r << 12;
	return o;
}

int32
olhr(int32 v, int b, int r, int sc)
{
	int32 o;

	if(sc & C_SBIT)
		diag(".S on LDRH/STRH instruction");
	o = (sc & C_SCOND) << 28;
	if(!(sc & C_PBIT))
		o |= 1 << 24;
	if(sc & C_WBIT)
		o |= 1 << 21;
	o |= (1<<23) | (1<<20)|(0xb<<4);
	if(v < 0) {
		v = -v;
		o ^= 1 << 23;
	}
	if(v >= (1<<8))
		diag("literal span too large: %d (R%d)\n%P", v, b, PP);
	o |= (v&0xf)|((v>>4)<<8)|(1<<22);
	o |= b << 16;
	o |= r << 12;
	return o;
}

int32
osr(int a, int r, int32 v, int b, int sc)
{
	int32 o;

	o = olr(v, b, r, sc) ^ (1<<20);
	if(a != AMOVW)
		o |= 1<<22;
	return o;
}

int32
oshr(int r, int32 v, int b, int sc)
{
	int32 o;

	o = olhr(v, b, r, sc) ^ (1<<20);
	return o;
}
	

int32
osrr(int r, int i, int b, int sc)
{

	return olr(i, b, r, sc) ^ ((1<<25) | (1<<20));
}

int32
oshrr(int r, int i, int b, int sc)
{
	return olhr(i, b, r, sc) ^ ((1<<22) | (1<<20));
}

int32
olrr(int i, int b, int r, int sc)
{

	return olr(i, b, r, sc) ^ (1<<25);
}

int32
olhrr(int i, int b, int r, int sc)
{
	return olhr(i, b, r, sc) ^ (1<<22);
}

int32
ofsr(int a, int r, int32 v, int b, int sc, Prog *p)
{
	int32 o;

	if(sc & C_SBIT)
		diag(".S on FLDR/FSTR instruction");
	o = (sc & C_SCOND) << 28;
	if(!(sc & C_PBIT))
		o |= 1 << 24;
	if(sc & C_WBIT)
		o |= 1 << 21;
	o |= (6<<25) | (1<<24) | (1<<23);
	if(v < 0) {
		v = -v;
		o ^= 1 << 23;
	}
	if(v & 3)
		diag("odd offset for floating point op: %d\n%P", v, p);
	else if(v >= (1<<10))
		diag("literal span too large: %d\n%P", v, p);
	o |= (v>>2) & 0xFF;
	o |= b << 16;
	o |= r << 12;
	o |= 1 << 8;

	switch(a) {
	default:
		diag("bad fst %A", a);
	case AMOVD:
		o |= 1<<15;
	case AMOVF:
		break;
	}
	return o;
}

int32
omvl(Prog *p, Adr *a, int dr)
{	
	int32 v, o1;
	if(!p->cond) {
		aclass(a);
		v = immrot(~instoffset);
		if(v == 0) {
			diag("missing literal");
			prasm(p);
			return 0;
		}
		o1 = oprrr(AMVN, p->scond&C_SCOND);
		o1 |= v;
		o1 |= dr << 12;
	} else {
		v = p->cond->pc - p->pc - 8;
		o1 = olr(v, REGPC, dr, p->scond&C_SCOND);
	}
	return o1;
}

static Ieee chipfloats[] = {
	{0x00000000, 0x00000000}, /* 0 */
	{0x00000000, 0x3ff00000}, /* 1 */
	{0x00000000, 0x40000000}, /* 2 */
	{0x00000000, 0x40080000}, /* 3 */
	{0x00000000, 0x40100000}, /* 4 */
	{0x00000000, 0x40140000}, /* 5 */
	{0x00000000, 0x3fe00000}, /* .5 */
	{0x00000000, 0x40240000}, /* 10 */
};

int
chipfloat(Ieee *e)
{
	Ieee *p;
	int n;

	for(n = sizeof(chipfloats)/sizeof(chipfloats[0]); --n >= 0;){
		p = &chipfloats[n];
		if(p->l == e->l && p->h == e->h)
			return n;
	}
	return -1;
}

uint32
linuxheadr(void)
{
	uint32 a;

	a = 64;		/* a.out header */

	a += 56;	/* page zero seg */
	a += 56;	/* text seg */
	a += 56;	/* stack seg */

	a += 64;	/* nil sect */
	a += 64;	/* .text sect */
	a += 64;	/* .data seg */
	a += 64;	/* .bss sect */
	a += 64;	/* .shstrtab sect - strings for headers */
	if (!debug['s']) {
		a += 56;	/* symdat seg */
		a += 64;	/* .gosymtab sect */
		a += 64;	/* .gopclntab sect */
	}

	return a;
}

void
linuxphdr(int type, int flags, vlong foff,
	vlong vaddr, vlong paddr,
	vlong filesize, vlong memsize, vlong align)
{

	lputl(type);			/* text - type = PT_LOAD */
	lputl(foff);			/* file offset */
	lputl(vaddr);			/* vaddr */
	lputl(paddr);			/* paddr */
	lputl(filesize);		/* file size */
	lputl(memsize);		/* memory size */
	lputl(flags);			/* text - flags = PF_X+PF_R */
	lputl(align);			/* alignment */
}

void
linuxshdr(char *name, uint32 type, vlong flags, vlong addr, vlong off,
	vlong size, uint32 link, uint32 info, vlong align, vlong entsize)
{
	lputl(stroffset);
	lputl(type);
	lputl(flags);
	lputl(addr);
	lputl(off);
	lputl(size);
	lputl(link);
	lputl(info);
	lputl(align);
	lputl(entsize);

	if(name != nil)
		stroffset += strlen(name)+1;
}

int
putstrtab(char* name)
{
	int w;

	w = strlen(name)+1;
	strnput(name, w);
	return w;
}

int
linuxstrtable(void)
{
	int size;

	size = 0;
	size += putstrtab("");
	size += putstrtab(".text");
	size += putstrtab(".data");
	size += putstrtab(".bss");
	size += putstrtab(".shstrtab");
	if (!debug['s']) {
		size += putstrtab(".gosymtab");
		size += putstrtab(".gopclntab");
	}
	return size;
}