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();
}
void
wputl(uint16 w)
{
cput(w);
cput(w>>8);
}
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++;
}
sput (struct put_fnct *put, char *s)
{
while (*s)
cput (put, *s++);
}
sput (char *s, struct put_fnct *put)
{
while (*s)
cput (*s++, put);
}