harvey/sys/src/cmd/6l/asm.c

/*
 * This file is part of the UCB release of Plan 9. It is subject to the license
 * terms in the LICENSE file found in the top-level directory of this
 * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
 * part of the UCB release of Plan 9, including this file, may be copied,
 * modified, propagated, or distributed except according to the terms contained
 * in the LICENSE file.
 */

#include	"l.h"

#define	Dbufslop	100

#define PADDR(a)	((a) & ~0xfffffffff0000000ull)

int64_t
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:
		break;
	case SDATA:
		if(dlm)
			return s->value+INITDAT;
	default:
		diag("entry not text: %s", s->name);
	}
	return s->value;
}

/* these need to take long arguments to be compatible with elf.c */void
wputl(int32_t w)
{
	cput(w);
	cput(w>>8);
}

void
wput(int32_t w)
{
	cput(w>>8);
	cput(w);
}

void
lput(int32_t l)
{
	cput(l>>24);
	cput(l>>16);
	cput(l>>8);
	cput(l);
}

void
llput(int64_t v)
{
	lput(v>>32);
	lput(v);
}

void
lputl(int32_t l)
{
	cput(l);
	cput(l>>8);
	cput(l>>16);
	cput(l>>24);
}

void
llputl(int64_t v)
{
	lputl(v);
	lputl(v>>32);
}

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

void
asmb(void)
{
	Prog *p;
	int32_t v, magic;
	int a;
	uint8_t *op1;
	int64_t vl;

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

	seek(cout, HEADR, 0);
	pc = INITTEXT;
	curp = firstp;
	for(p = firstp; p != P; p = p->link) {
		if(p->as == ATEXT)
			curtext = p;
		if(p->pc != pc) {
			if(!debug['a'])
				print("%P\n", curp);
			diag("phase error %llux sb %llux in %s", p->pc, pc, TNAME);
			pc = p->pc;
		}
		curp = p;
		asmins(p);
		a = (andptr - and);
		if(cbc < a)
			cflush();
		if(debug['a']) {
			Bprint(&bso, pcstr, pc);
			for(op1 = and; op1 < andptr; op1++)
				Bprint(&bso, "%.2ux", *op1 & 0xff);
			Bprint(&bso, "\t%P\n", curp);
		}
		if(dlm) {
			if(p->as == ATEXT)
				reloca = nil;
			else if(reloca != nil)
				diag("reloc failure: %P", curp);
		}
		memmove(cbp, and, a);
		cbp += a;
		pc += a;
		cbc -= a;
	}
	cflush();
	switch(HEADTYPE) {
	default:
		diag("unknown header type %ld", HEADTYPE);
	case 2:
	case 5:
	case 6:
		seek(cout, HEADR+textsize, 0);
		break;
	}

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

	if(dlm){
		char buf[8];

		write(cout, buf, INITDAT-textsize);
		textsize = INITDAT;
	}

	for(v = 0; v < datsize; v += sizeof(buf)-Dbufslop) {
		if(datsize-v > sizeof(buf)-Dbufslop)
			datblk(v, sizeof(buf)-Dbufslop);
		else
			datblk(v, datsize-v);
	}

	symsize = 0;
	spsize = 0;
	lcsize = 0;
	if(!debug['s']) {
		if(debug['v'])
			Bprint(&bso, "%5.2f sym\n", cputime());
		Bflush(&bso);
		switch(HEADTYPE) {
		default:
		case 2:
		case 5:
		case 6:
			seek(cout, HEADR+textsize+datsize, 0);
			break;
		}
		if(!debug['s'])
			asmsym();
		if(debug['v'])
			Bprint(&bso, "%5.2f sp\n", cputime());
		Bflush(&bso);
		if(debug['v'])
			Bprint(&bso, "%5.2f pc\n", cputime());
		Bflush(&bso);
		if(!debug['s'])
			asmlc();
		if(dlm)
			asmdyn();
		cflush();
	}
	else if(dlm){
		seek(cout, HEADR+textsize+datsize, 0);
		asmdyn();
		cflush();
	}
	if(debug['v'])
		Bprint(&bso, "%5.2f headr\n", cputime());
	Bflush(&bso);
	seek(cout, 0L, 0);
	switch(HEADTYPE) {
	default:
	case 2:	/* plan9 */
		magic = 4*26*26+7;
		magic |= 0x00008000;		/* fat header */
		if(dlm)
			magic |= 0x80000000;	/* dlm */
		lput(magic);			/* magic */
		lput(textsize);			/* sizes */
		lput(datsize);
		lput(bsssize);
		lput(symsize);			/* nsyms */
		vl = entryvalue();
		lput(PADDR(vl));		/* va of entry */
		lput(spsize);			/* sp offsets */
		lput(lcsize);			/* line offsets */
		llput(vl);			/* va of entry */
		break;
	case 5:
		elf32(debug['8']? I386: AMD64, ELFDATA2LSB, 0, nil);
		break;
	case 6:
		elf64(AMD64, ELFDATA2LSB, 0, nil);
		break;
	}
	cflush();
}

void
cflush(void)
{
	int n;

	n = sizeof(buf.cbuf) - cbc;
	if(n)
		write(cout, buf.cbuf, n);
	cbp = buf.cbuf;
	cbc = sizeof(buf.cbuf);
}

void
datblk(int32_t s, int32_t n)
{
	Prog *p;
	uint8_t *cast;
	int32_t l, fl, j;
	int64_t o;
	int i, c;

	memset(buf.dbuf, 0, n+Dbufslop);
	for(p = datap; p != P; p = p->link) {
		curp = p;
		l = p->from.sym->value + p->from.offset - s;
		c = p->from.scale;
		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) {
		case D_FCONST:
			switch(c) {
			default:
			case 4:
				fl = ieeedtof(&p->to.ieee);
				cast = (uint8_t*)&fl;
				if(debug['a'] && i == 0) {
					Bprint(&bso, pcstr, l+s+INITDAT);
					for(j=0; j<c; j++)
						Bprint(&bso, "%.2ux", cast[fnuxi4[j]]);
					Bprint(&bso, "\t%P\n", curp);
				}
				for(; i<c; i++) {
					buf.dbuf[l] = cast[fnuxi4[i]];
					l++;
				}
				break;
			case 8:
				cast = (uint8_t*)&p->to.ieee;
				if(debug['a'] && i == 0) {
					Bprint(&bso, pcstr, l+s+INITDAT);
					for(j=0; j<c; j++)
						Bprint(&bso, "%.2ux", cast[fnuxi8[j]]);
					Bprint(&bso, "\t%P\n", curp);
				}
				for(; i<c; i++) {
					buf.dbuf[l] = cast[fnuxi8[i]];
					l++;
				}
				break;
			}
			break;

		case D_SCONST:
			if(debug['a'] && i == 0) {
				Bprint(&bso, pcstr, l+s+INITDAT);
				for(j=0; j<c; j++)
					Bprint(&bso, "%.2ux", p->to.scon[j] & 0xff);
				Bprint(&bso, "\t%P\n", curp);
			}
			for(; i<c; i++) {
				buf.dbuf[l] = p->to.scon[i];
				l++;
			}
			break;
		default:
			o = p->to.offset;
			if(p->to.type == D_ADDR) {
				if(p->to.index != D_STATIC && p->to.index != D_EXTERN)
					diag("DADDR type%P", p);
				if(p->to.sym) {
					if(p->to.sym->type == SUNDEF)
						ckoff(p->to.sym, o);
					o += p->to.sym->value;
					if(p->to.sym->type != STEXT && p->to.sym->type != SUNDEF)
						o += INITDAT;
					if(dlm)
						dynreloc(p->to.sym, l+s+INITDAT, 1);
				}
			}
			fl = o;
			cast = (uint8_t*)&fl;
			switch(c) {
			default:
				diag("bad nuxi %d %d\n%P", c, i, curp);
				break;
			case 1:
				if(debug['a'] && i == 0) {
					Bprint(&bso, pcstr, l+s+INITDAT);
					for(j=0; j<c; j++)
						Bprint(&bso, "%.2ux", cast[inuxi1[j]]);
					Bprint(&bso, "\t%P\n", curp);
				}
				for(; i<c; i++) {
					buf.dbuf[l] = cast[inuxi1[i]];
					l++;
				}
				break;
			case 2:
				if(debug['a'] && i == 0) {
					Bprint(&bso, pcstr, l+s+INITDAT);
					for(j=0; j<c; j++)
						Bprint(&bso, "%.2ux", cast[inuxi2[j]]);
					Bprint(&bso, "\t%P\n", curp);
				}
				for(; i<c; i++) {
					buf.dbuf[l] = cast[inuxi2[i]];
					l++;
				}
				break;
			case 4:
				if(debug['a'] && i == 0) {
					Bprint(&bso, pcstr, l+s+INITDAT);
					for(j=0; j<c; j++)
						Bprint(&bso, "%.2ux", cast[inuxi4[j]]);
					Bprint(&bso, "\t%P\n", curp);
				}
				for(; i<c; i++) {
					buf.dbuf[l] = cast[inuxi4[i]];
					l++;
				}
				break;
			case 8:
				cast = (uint8_t*)&o;
				if(debug['a'] && i == 0) {
					Bprint(&bso, pcstr, l+s+INITDAT);
					for(j=0; j<c; j++)
						Bprint(&bso, "%.2ux", cast[inuxi8[j]]);
					Bprint(&bso, "\t%P\n", curp);
				}
				for(; i<c; i++) {
					buf.dbuf[l] = cast[inuxi8[i]];
					l++;
				}
				break;
			}
			break;
		}
	}
	write(cout, buf.dbuf, n);
}

int64_t
rnd(int64_t v, int64_t r)
{
	int64_t c;

	if(r <= 0)
		return v;
	v += r - 1;
	c = v % r;
	if(c < 0)
		c += r;
	v -= c;
	return v;
}