Example #1
0
void
asmb(void)
{
	int32 v, magic;
	int a, dynsym;
	uint32 va, fo, w, symo, startva, machlink;
	ElfEhdr *eh;
	ElfPhdr *ph, *pph;
	ElfShdr *sh;
	Section *sect;
	Sym *sym;
	int i;

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

	sect = segtext.sect;
	seek(cout, sect->vaddr - segtext.vaddr + segtext.fileoff, 0);
	codeblk(sect->vaddr, sect->len);

	/* output read-only data in text segment */
	sect = segtext.sect->next;
	seek(cout, sect->vaddr - segtext.vaddr + segtext.fileoff, 0);
	datblk(sect->vaddr, sect->len);

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

	seek(cout, segdata.fileoff, 0);
	datblk(segdata.vaddr, segdata.filelen);

	machlink = 0;
	if(HEADTYPE == Hdarwin)
		machlink = domacholink();

	if(iself) {
		/* index of elf text section; needed by asmelfsym, double-checked below */
		/* !debug['d'] causes extra sections before the .text section */
		elftextsh = 1;
		if(!debug['d'])
			elftextsh += 10;
	}

	symsize = 0;
	spsize = 0;
	lcsize = 0;
	symo = 0;
	if(!debug['s']) {
		// TODO: rationalize
		if(debug['v'])
			Bprint(&bso, "%5.2f sym\n", cputime());
		Bflush(&bso);
		switch(HEADTYPE) {
		default:
			if(iself)
				goto Elfsym;
		case Hgarbunix:
			seek(cout, rnd(HEADR+segtext.filelen, 8192)+segdata.filelen, 0);
			break;
		case Hunixcoff:
			seek(cout, rnd(HEADR+segtext.filelen, INITRND)+segdata.filelen, 0);
			break;
		case Hplan9x32:
			symo = HEADR+segtext.filelen+segdata.filelen;
			break;
		case Hmsdoscom:
		case Hmsdosexe:
			debug['s'] = 1;
			symo = HEADR+segtext.filelen+segdata.filelen;
			break;
		case Hdarwin:
			symo = rnd(HEADR+segtext.filelen, INITRND)+rnd(segdata.filelen, INITRND)+machlink;
			break;
		Elfsym:
			symo = rnd(HEADR+segtext.filelen, INITRND)+segdata.filelen;
			symo = rnd(symo, INITRND);
			break;
		case Hwindows:
			// TODO(brainman): not sure what symo meant to be, but it is not used for Windows PE for now anyway
			symo = rnd(HEADR+segtext.filelen, PEFILEALIGN)+segdata.filelen;
			symo = rnd(symo, PEFILEALIGN);
			break;
		}
		if(!debug['s']) {
			seek(cout, symo, 0);
			
			if(HEADTYPE == Hplan9x32) {
				asmplan9sym();
				cflush();
				
				sym = lookup("pclntab", 0);
				if(sym != nil) {
					lcsize = sym->np;
					for(i=0; i < lcsize; i++)
						cput(sym->p[i]);
					
					cflush();
				}
				
			} else if(HEADTYPE != Hwindows) {
				if(debug['v'])
					Bprint(&bso, "%5.2f dwarf\n", cputime());
				dwarfemitdebugsections();
			}
		}
	}
	if(debug['v'])
		Bprint(&bso, "%5.2f headr\n", cputime());
	Bflush(&bso);
	seek(cout, 0L, 0);
	switch(HEADTYPE) {
	default:
		if(iself)
			goto Elfput;
	case Hgarbunix:	/* garbage */
		lputb(0x160L<<16);		/* magic and sections */
		lputb(0L);			/* time and date */
		lputb(rnd(HEADR+segtext.filelen, 4096)+segdata.filelen);
		lputb(symsize);			/* nsyms */
		lputb((0x38L<<16)|7L);		/* size of optional hdr and flags */
		lputb((0413<<16)|0437L);		/* magic and version */
		lputb(rnd(HEADR+segtext.filelen, 4096));	/* sizes */
		lputb(segdata.filelen);
		lputb(segdata.len - segdata.filelen);
		lputb(entryvalue());		/* va of entry */
		lputb(INITTEXT-HEADR);		/* va of base of text */
		lputb(segdata.vaddr);			/* va of base of data */
		lputb(segdata.vaddr+segdata.filelen);		/* va of base of bss */
		lputb(~0L);			/* gp reg mask */
		lputb(0L);
		lputb(0L);
		lputb(0L);
		lputb(0L);
		lputb(~0L);			/* gp value ?? */
		break;
		lputl(0);			/* x */
	case Hunixcoff:	/* unix coff */
		/*
		 * file header
		 */
		lputl(0x0004014c);		/* 4 sections, magic */
		lputl(0);			/* unix time stamp */
		lputl(0);			/* symbol table */
		lputl(0);			/* nsyms */
		lputl(0x0003001c);		/* flags, sizeof a.out header */
		/*
		 * a.out header
		 */
		lputl(0x10b);			/* magic, version stamp */
		lputl(rnd(segtext.filelen, INITRND));	/* text sizes */
		lputl(segdata.filelen);			/* data sizes */
		lputl(segdata.len - segdata.filelen);			/* bss sizes */
		lputb(entryvalue());		/* va of entry */
		lputl(INITTEXT);		/* text start */
		lputl(segdata.vaddr);			/* data start */
		/*
		 * text section header
		 */
		s8put(".text");
		lputl(HEADR);			/* pa */
		lputl(HEADR);			/* va */
		lputl(segtext.filelen);		/* text size */
		lputl(HEADR);			/* file offset */
		lputl(0);			/* relocation */
		lputl(0);			/* line numbers */
		lputl(0);			/* relocation, line numbers */
		lputl(0x20);			/* flags text only */
		/*
		 * data section header
		 */
		s8put(".data");
		lputl(segdata.vaddr);			/* pa */
		lputl(segdata.vaddr);			/* va */
		lputl(segdata.filelen);			/* data size */
		lputl(HEADR+segtext.filelen);		/* file offset */
		lputl(0);			/* relocation */
		lputl(0);			/* line numbers */
		lputl(0);			/* relocation, line numbers */
		lputl(0x40);			/* flags data only */
		/*
		 * bss section header
		 */
		s8put(".bss");
		lputl(segdata.vaddr+segdata.filelen);		/* pa */
		lputl(segdata.vaddr+segdata.filelen);		/* va */
		lputl(segdata.len - segdata.filelen);			/* bss size */
		lputl(0);			/* file offset */
		lputl(0);			/* relocation */
		lputl(0);			/* line numbers */
		lputl(0);			/* relocation, line numbers */
		lputl(0x80);			/* flags bss only */
		/*
		 * comment section header
		 */
		s8put(".comment");
		lputl(0);			/* pa */
		lputl(0);			/* va */
		lputl(symsize+lcsize);		/* comment size */
		lputl(HEADR+segtext.filelen+segdata.filelen);	/* file offset */
		lputl(HEADR+segtext.filelen+segdata.filelen);	/* offset of syms */
		lputl(HEADR+segtext.filelen+segdata.filelen+symsize);/* offset of line numbers */
		lputl(0);			/* relocation, line numbers */
		lputl(0x200);			/* flags comment only */
		break;
	case Hplan9x32:	/* plan9 */
		magic = 4*11*11+7;
		lputb(magic);		/* magic */
		lputb(segtext.filelen);			/* sizes */
		lputb(segdata.filelen);
		lputb(segdata.len - segdata.filelen);
		lputb(symsize);			/* nsyms */
		lputb(entryvalue());		/* va of entry */
		lputb(spsize);			/* sp offsets */
		lputb(lcsize);			/* line offsets */
		break;
	case Hmsdoscom:
		/* MS-DOS .COM */
		break;
	case Hmsdosexe:
		/* fake MS-DOS .EXE */
		v = rnd(HEADR+segtext.filelen, INITRND)+segdata.filelen;
		wputl(0x5A4D);			/* 'MZ' */
		wputl(v % 512);			/* bytes in last page */
		wputl(rnd(v, 512)/512);		/* total number of pages */
		wputl(0x0000);			/* number of reloc items */
		v = rnd(HEADR-(INITTEXT & 0xFFFF), 16);
		wputl(v/16);			/* size of header */
		wputl(0x0000);			/* minimum allocation */
		wputl(0xFFFF);			/* maximum allocation */
		wputl(0x0000);			/* initial ss value */
		wputl(0x0100);			/* initial sp value */
		wputl(0x0000);			/* complemented checksum */
		v = entryvalue();
		wputl(v);			/* initial ip value (!) */
		wputl(0x0000);			/* initial cs value */
		wputl(0x0000);
		wputl(0x0000);
		wputl(0x003E);			/* reloc table offset */
		wputl(0x0000);			/* overlay number */
		break;

	case Hdarwin:
		asmbmacho();
		break;

	Elfput:
		/* elf 386 */
		if(HEADTYPE == Htiny)
			debug['d'] = 1;

		eh = getElfEhdr();
		fo = HEADR;
		startva = INITTEXT - HEADR;
		va = startva + fo;
		w = segtext.filelen;

		/* This null SHdr must appear before all others */
		sh = newElfShdr(elfstr[ElfStrEmpty]);

		/* program header info */
		pph = newElfPhdr();
		pph->type = PT_PHDR;
		pph->flags = PF_R + PF_X;
		pph->off = eh->ehsize;
		pph->vaddr = INITTEXT - HEADR + pph->off;
		pph->paddr = INITTEXT - HEADR + pph->off;
		pph->align = INITRND;

		if(!debug['d']) {
			/* interpreter */
			sh = newElfShdr(elfstr[ElfStrInterp]);
			sh->type = SHT_PROGBITS;
			sh->flags = SHF_ALLOC;
			sh->addralign = 1;
			if(interpreter == nil) {
				switch(HEADTYPE) {
				case Hlinux:
				case Hucore:
					interpreter = linuxdynld;
					break;
				case Hfreebsd:
					interpreter = freebsddynld;
					break;
				}
			}
			elfinterp(sh, startva, interpreter);

			ph = newElfPhdr();
			ph->type = PT_INTERP;
			ph->flags = PF_R;
			phsh(ph, sh);
		}

		elfphload(&segtext);
		elfphload(&segdata);

		/* Dynamic linking sections */
		if (!debug['d']) {	/* -d suppresses dynamic loader format */
			/* S headers for dynamic linking */
			sh = newElfShdr(elfstr[ElfStrGot]);
			sh->type = SHT_PROGBITS;
			sh->flags = SHF_ALLOC+SHF_WRITE;
			sh->entsize = 4;
			sh->addralign = 4;
			shsym(sh, lookup(".got", 0));

			sh = newElfShdr(elfstr[ElfStrGotPlt]);
			sh->type = SHT_PROGBITS;
			sh->flags = SHF_ALLOC+SHF_WRITE;
			sh->entsize = 4;
			sh->addralign = 4;
			shsym(sh, lookup(".got.plt", 0));

			dynsym = eh->shnum;
			sh = newElfShdr(elfstr[ElfStrDynsym]);
			sh->type = SHT_DYNSYM;
			sh->flags = SHF_ALLOC;
			sh->entsize = ELF32SYMSIZE;
			sh->addralign = 4;
			sh->link = dynsym+1;	// dynstr
			// sh->info = index of first non-local symbol (number of local symbols)
			shsym(sh, lookup(".dynsym", 0));

			sh = newElfShdr(elfstr[ElfStrDynstr]);
			sh->type = SHT_STRTAB;
			sh->flags = SHF_ALLOC;
			sh->addralign = 1;
			shsym(sh, lookup(".dynstr", 0));
			
			sh = newElfShdr(elfstr[ElfStrRelPlt]);
			sh->type = SHT_REL;
			sh->flags = SHF_ALLOC;
			sh->entsize = ELF32RELSIZE;
			sh->addralign = 4;
			sh->link = dynsym;
			sh->info = eh->shnum;	// .plt
			shsym(sh, lookup(".rel.plt", 0));
			
			sh = newElfShdr(elfstr[ElfStrPlt]);
			sh->type = SHT_PROGBITS;
			sh->flags = SHF_ALLOC+SHF_EXECINSTR;
			sh->entsize = 4;
			sh->addralign = 4;
			shsym(sh, lookup(".plt", 0));

			sh = newElfShdr(elfstr[ElfStrHash]);
			sh->type = SHT_HASH;
			sh->flags = SHF_ALLOC;
			sh->entsize = 4;
			sh->addralign = 4;
			sh->link = dynsym;
			shsym(sh, lookup(".hash", 0));

			sh = newElfShdr(elfstr[ElfStrRel]);
			sh->type = SHT_REL;
			sh->flags = SHF_ALLOC;
			sh->entsize = ELF32RELSIZE;
			sh->addralign = 4;
			sh->link = dynsym;
			shsym(sh, lookup(".rel", 0));

			/* sh and PT_DYNAMIC for .dynamic section */
			sh = newElfShdr(elfstr[ElfStrDynamic]);
			sh->type = SHT_DYNAMIC;
			sh->flags = SHF_ALLOC+SHF_WRITE;
			sh->entsize = 8;
			sh->addralign = 4;
			sh->link = dynsym+1;	// dynstr
			shsym(sh, lookup(".dynamic", 0));
			ph = newElfPhdr();
			ph->type = PT_DYNAMIC;
			ph->flags = PF_R + PF_W;
			phsh(ph, sh);

			/*
			 * Thread-local storage segment (really just size).
			 */
			if(tlsoffset != 0) {
				ph = newElfPhdr();
				ph->type = PT_TLS;
				ph->flags = PF_R;
				ph->memsz = -tlsoffset;
				ph->align = 4;
			}
		}

		ph = newElfPhdr();
		ph->type = PT_GNU_STACK;
		ph->flags = PF_W+PF_R;
		ph->align = 4;

		if(elftextsh != eh->shnum)
			diag("elftextsh = %d, want %d", elftextsh, eh->shnum);
		for(sect=segtext.sect; sect!=nil; sect=sect->next)
			elfshbits(sect);
		for(sect=segdata.sect; sect!=nil; sect=sect->next)
			elfshbits(sect);

		if (!debug['s']) {
			sh = newElfShdr(elfstr[ElfStrGosymtab]);
			sh->type = SHT_PROGBITS;
			sh->flags = SHF_ALLOC;
			sh->addralign = 1;
			shsym(sh, lookup("symtab", 0));

			sh = newElfShdr(elfstr[ElfStrGopclntab]);
			sh->type = SHT_PROGBITS;
			sh->flags = SHF_ALLOC;
			sh->addralign = 1;
			shsym(sh, lookup("pclntab", 0));

			dwarfaddelfheaders();
		}

		sh = newElfShstrtab(elfstr[ElfStrShstrtab]);
		sh->type = SHT_STRTAB;
		sh->addralign = 1;
		shsym(sh, lookup(".shstrtab", 0));

		/* Main header */
		eh->ident[EI_MAG0] = '\177';
		eh->ident[EI_MAG1] = 'E';
		eh->ident[EI_MAG2] = 'L';
		eh->ident[EI_MAG3] = 'F';
		eh->ident[EI_CLASS] = ELFCLASS32;
		eh->ident[EI_DATA] = ELFDATA2LSB;
		eh->ident[EI_VERSION] = EV_CURRENT;
		switch(HEADTYPE) {
		case Hfreebsd:
			eh->ident[EI_OSABI] = 9;
			break;
		}

		eh->type = ET_EXEC;
		eh->machine = EM_386;
		eh->version = EV_CURRENT;
		eh->entry = entryvalue();

		if(pph != nil) {
			pph->filesz = eh->phnum * eh->phentsize;
			pph->memsz = pph->filesz;
		}

		seek(cout, 0, 0);
		a = 0;
		a += elfwritehdr();
		a += elfwritephdrs();
		a += elfwriteshdrs();
		cflush();
		if(a+elfwriteinterp() > ELFRESERVE)
			diag("ELFRESERVE too small: %d > %d", a, ELFRESERVE);
		break;

	case Hwindows:
		asmbpe();
		break;
	}
	cflush();
}
Example #2
0
void
wputl(uint16 w)
{
	cput(w);
	cput(w>>8);
}
Example #3
0
void
asmlc(void)
{
	long oldpc, oldlc;
	Prog *p;
	long v, s;

	oldpc = INITTEXT;
	oldlc = 0;
	for(p = firstp; p != P; p = p->link) {
		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++;
	}
Example #4
0
sput (struct put_fnct *put, char *s)
{
	while (*s)
		cput (put, *s++);
}
Example #5
0
sput (char *s, struct put_fnct *put)
{
	while (*s)
		cput (*s++, put);
}