// Inferno utils/8l/asm.c
// http://code.google.com/p/inferno-os/source/browse/utils/8l/asm.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth ([email protected])
// 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 ([email protected])
// 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"
#include "../ld/lib.h"
#include "../ld/elf.h"
#include "../ld/macho.h"
#define Dbufslop 100
char linuxdynld[] = "/lib/ld-linux.so.2";
char freebsddynld[] = "/usr/libexec/ld-elf.so.1";
uint32 symdatva = 0x99<<24;
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:
break;
case SDATA:
if(dlm)
return s->value+INITDAT;
default:
diag("entry not text: %s", s->name);
}
return s->value;
}
void
wputl(ushort w)
{
cput(w);
cput(w>>8);
}
void
wput(ushort w)
{
cput(w>>8);
cput(w);
}
void
lput(int32 l)
{
cput(l>>24);
cput(l>>16);
cput(l>>8);
cput(l);
}
void
lputl(int32 l)
{
cput(l);
cput(l>>8);
cput(l>>16);
cput(l>>24);
}
void
vputl(uvlong l)
{
lputl(l >> 32);
lputl(l);
}
void
strnput(char *s, int n)
{
for(; *s && n > 0; s++) {
cput(*s);
n--;
}
while(n > 0) {
cput(0);
n--;
}
}
vlong
addstring(Sym *s, char *str)
{
int n, m;
vlong r;
Prog *p;
if(s->type == 0)
s->type = SDATA;
s->reachable = 1;
r = s->value;
n = strlen(str)+1;
while(n > 0) {
m = n;
if(m > sizeof(p->to.scon))
m = sizeof(p->to.scon);
p = newdata(s, s->value, m, D_EXTERN);
p->to.type = D_SCONST;
memmove(p->to.scon, str, m);
s->value += m;
str += m;
n -= m;
}
return r;
}
vlong
adduintxx(Sym *s, uint64 v, int wid)
{
vlong r;
Prog *p;
if(s->type == 0)
s->type = SDATA;
s->reachable = 1;
r = s->value;
p = newdata(s, s->value, wid, D_EXTERN);
s->value += wid;
p->to.type = D_CONST;
p->to.offset = v;
return r;
}
vlong
adduint8(Sym *s, uint8 v)
{
return adduintxx(s, v, 1);
}
vlong
adduint16(Sym *s, uint16 v)
{
return adduintxx(s, v, 2);
}
vlong
adduint32(Sym *s, uint32 v)
{
return adduintxx(s, v, 4);
}
vlong
adduint64(Sym *s, uint64 v)
{
return adduintxx(s, v, 8);
}
vlong
addaddr(Sym *s, Sym *t)
{
vlong r;
Prog *p;
enum { Ptrsize = 4 };
if(s->type == 0)
s->type = SDATA;
s->reachable = 1;
r = s->value;
p = newdata(s, s->value, Ptrsize, D_EXTERN);
s->value += Ptrsize;
p->to.type = D_ADDR;
p->to.index = D_EXTERN;
p->to.offset = 0;
p->to.sym = t;
return r;
}
vlong
addsize(Sym *s, Sym *t)
{
vlong r;
Prog *p;
enum { Ptrsize = 4 };
if(s->type == 0)
s->type = SDATA;
s->reachable = 1;
r = s->value;
p = newdata(s, s->value, Ptrsize, D_EXTERN);
s->value += Ptrsize;
p->to.type = D_SIZE;
p->to.index = D_EXTERN;
p->to.offset = 0;
p->to.sym = t;
return r;
}
vlong
datoff(vlong addr)
{
if(addr >= INITDAT)
return addr - INITDAT + rnd(HEADR+textsize, INITRND);
diag("datoff %#llx", addr);
return 0;
}
enum {
ElfStrEmpty,
ElfStrInterp,
ElfStrHash,
ElfStrGot,
ElfStrGotPlt,
ElfStrDynamic,
ElfStrDynsym,
ElfStrDynstr,
ElfStrRel,
ElfStrText,
ElfStrData,
ElfStrBss,
ElfStrGosymtab,
ElfStrGopclntab,
ElfStrShstrtab,
NElfStr
};
vlong elfstr[NElfStr];
static int
needlib(char *name)
{
char *p;
Sym *s;
/* reuse hash code in symbol table */
p = smprint(".dynlib.%s", name);
s = lookup(p, 0);
if(s->type == 0) {
s->type = 100; // avoid SDATA, etc.
return 1;
}
return 0;
}
void
doelf(void)
{
Sym *s, *shstrtab, *dynamic, *dynstr, *d;
int h, nsym, t;
if(HEADTYPE != 7 && HEADTYPE != 8 && HEADTYPE != 9)
return;
/* predefine strings we need for section headers */
shstrtab = lookup(".shstrtab", 0);
shstrtab->reachable = 1;
elfstr[ElfStrEmpty] = addstring(shstrtab, "");
elfstr[ElfStrText] = addstring(shstrtab, ".text");
elfstr[ElfStrData] = addstring(shstrtab, ".data");
elfstr[ElfStrBss] = addstring(shstrtab, ".bss");
if(!debug['s']) {
elfstr[ElfStrGosymtab] = addstring(shstrtab, ".gosymtab");
elfstr[ElfStrGopclntab] = addstring(shstrtab, ".gopclntab");
}
elfstr[ElfStrShstrtab] = addstring(shstrtab, ".shstrtab");
if(!debug['d']) { /* -d suppresses dynamic loader format */
elfstr[ElfStrInterp] = addstring(shstrtab, ".interp");
elfstr[ElfStrHash] = addstring(shstrtab, ".hash");
elfstr[ElfStrGot] = addstring(shstrtab, ".got");
elfstr[ElfStrGotPlt] = addstring(shstrtab, ".got.plt");
elfstr[ElfStrDynamic] = addstring(shstrtab, ".dynamic");
elfstr[ElfStrDynsym] = addstring(shstrtab, ".dynsym");
elfstr[ElfStrDynstr] = addstring(shstrtab, ".dynstr");
elfstr[ElfStrRel] = addstring(shstrtab, ".rel");
/* interpreter string */
s = lookup(".interp", 0);
s->reachable = 1;
s->type = SDATA; // TODO: rodata
/* dynamic symbol table - first entry all zeros */
s = lookup(".dynsym", 0);
s->type = SDATA;
s->reachable = 1;
s->value += ELF32SYMSIZE;
/* dynamic string table */
s = lookup(".dynstr", 0);
addstring(s, "");
dynstr = s;
/* relocation table */
s = lookup(".rel", 0);
s->reachable = 1;
s->type = SDATA;
/* global offset table */
s = lookup(".got", 0);
s->reachable = 1;
s->type = SDATA;
/* got.plt - ??? */
s = lookup(".got.plt", 0);
s->reachable = 1;
s->type = SDATA;
/* define dynamic elf table */
s = lookup(".dynamic", 0);
dynamic = s;
/*
* relocation entries for dynld symbols
*/
nsym = 1; // sym 0 is reserved
for(h=0; h<NHASH; h++) {
for(s=hash[h]; s!=S; s=s->link) {
if(!s->reachable || (s->type != SDATA && s->type != SBSS) || s->dynldname == nil)
continue;
d = lookup(".rel", 0);
addaddr(d, s);
adduint32(d, ELF32_R_INFO(nsym, R_386_32));
nsym++;
d = lookup(".dynsym", 0);
adduint32(d, addstring(lookup(".dynstr", 0), s->dynldname));
adduint32(d, 0); /* value */
adduint32(d, 0); /* size of object */
t = STB_GLOBAL << 4;
t |= STT_OBJECT; // works for func too, empirically
adduint8(d, t);
adduint8(d, 0); /* reserved */
adduint16(d, SHN_UNDEF); /* section where symbol is defined */
if(needlib(s->dynldlib))
elfwritedynent(dynamic, DT_NEEDED, addstring(dynstr, s->dynldlib));
}
}
/*
* hash table.
* only entries that other objects need to find when
* linking us need to be in the table. right now that is
* no entries.
*
* freebsd insists on having chains enough for all
* the local symbols, though. for now, we just lay
* down a trivial hash table with 1 bucket and a long chain,
* because no one is actually looking for our symbols.
*/
s = lookup(".hash", 0);
s->type = SDATA; // TODO: rodata
s->reachable = 1;
adduint32(s, 1); // nbucket
adduint32(s, nsym); // nchain
adduint32(s, nsym-1); // bucket 0
adduint32(s, 0); // chain 0
for(h=1; h<nsym; h++) // chain nsym-1 -> nsym-2 -> ... -> 2 -> 1 -> 0
adduint32(s, h-1);
/*
* .dynamic table
*/
s = dynamic;
elfwritedynentsym(s, DT_HASH, lookup(".hash", 0));
elfwritedynentsym(s, DT_SYMTAB, lookup(".dynsym", 0));
elfwritedynent(s, DT_SYMENT, ELF32SYMSIZE);
elfwritedynentsym(s, DT_STRTAB, lookup(".dynstr", 0));
elfwritedynentsymsize(s, DT_STRSZ, lookup(".dynstr", 0));
elfwritedynentsym(s, DT_REL, lookup(".rel", 0));
elfwritedynentsymsize(s, DT_RELSZ, lookup(".rel", 0));
elfwritedynent(s, DT_RELENT, ELF32RELSIZE);
elfwritedynent(s, DT_NULL, 0);
}
}
void
shsym(Elf64_Shdr *sh, Sym *s)
{
sh->addr = symaddr(s);
sh->off = datoff(sh->addr);
sh->size = s->size;
}
void
phsh(Elf64_Phdr *ph, Elf64_Shdr *sh)
{
ph->vaddr = sh->addr;
ph->paddr = ph->vaddr;
ph->off = sh->off;
ph->filesz = sh->size;
ph->memsz = sh->size;
ph->align = sh->addralign;
}
void
asmb(void)
{
Prog *p;
int32 v, magic;
int a, dynsym;
uint32 va, fo, w, symo, startva, machlink;
uchar *op1;
ulong expectpc;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
ElfShdr *sh;
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;
curp = p;
if(HEADTYPE == 8) {
// native client
expectpc = p->pc;
p->pc = pc;
asmins(p);
if(p->pc != expectpc) {
Bflush(&bso);
diag("phase error %lux sb %lux in %s", p->pc, expectpc, TNAME);
}
while(pc < p->pc) {
cput(0x90); // nop
pc++;
}
}
if(p->pc != pc) {
Bflush(&bso);
if(!debug['a'])
print("%P\n", curp);
diag("phase error %lux sb %lux in %s", p->pc, pc, TNAME);
pc = p->pc;
}
if(HEADTYPE != 8) {
asmins(p);
if(pc != p->pc) {
Bflush(&bso);
diag("asmins changed pc %lux sb %lux in %s", p->pc, pc, TNAME);
}
}
if(cbc < sizeof(and))
cflush();
a = (andptr - and);
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;
}
if(HEADTYPE == 8) {
while(pc < INITDAT) {
cput(0xf4); // hlt
pc++;
}
}
cflush();
switch(HEADTYPE) {
default:
diag("unknown header type %d", HEADTYPE);
case 0:
seek(cout, rnd(HEADR+textsize, 8192), 0);
break;
case 1:
textsize = rnd(HEADR+textsize, 4096)-HEADR;
seek(cout, textsize+HEADR, 0);
break;
case 2:
seek(cout, HEADR+textsize, 0);
break;
case 3:
case 4:
seek(cout, HEADR+rnd(textsize, INITRND), 0);
break;
case 6:
v = HEADR+textsize;
seek(cout, v, 0);
v = rnd(v, 4096) - v;
while(v > 0) {
cput(0);
v--;
}
cflush();
break;
case 7:
case 8:
case 9:
v = rnd(HEADR+textsize, INITRND);
seek(cout, v, 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);
}
machlink = 0;
if(HEADTYPE == 6)
machlink = domacholink();
symsize = 0;
spsize = 0;
lcsize = 0;
symo = 0;
if(!debug['s']) {
if(debug['v'])
Bprint(&bso, "%5.2f sym\n", cputime());
Bflush(&bso);
switch(HEADTYPE) {
default:
case 0:
seek(cout, rnd(HEADR+textsize, 8192)+datsize, 0);
break;
case 1:
seek(cout, rnd(HEADR+textsize, INITRND)+datsize, 0);
break;
case 2:
seek(cout, HEADR+textsize+datsize, 0);
break;
case 3:
case 4:
debug['s'] = 1;
symo = HEADR+textsize+datsize;
break;
case 6:
symo = rnd(HEADR+textsize, INITRND)+rnd(datsize, INITRND)+machlink;
break;
case 7:
case 8:
case 9:
symo = rnd(HEADR+textsize, INITRND)+datsize;
symo = rnd(symo, INITRND);
break;
}
seek(cout, symo+8, 0);
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();
seek(cout, symo, 0);
lputl(symsize);
lputl(lcsize);
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 0: /* garbage */
lput(0x160L<<16); /* magic and sections */
lput(0L); /* time and date */
lput(rnd(HEADR+textsize, 4096)+datsize);
lput(symsize); /* nsyms */
lput((0x38L<<16)|7L); /* size of optional hdr and flags */
lput((0413<<16)|0437L); /* magic and version */
lput(rnd(HEADR+textsize, 4096)); /* sizes */
lput(datsize);
lput(bsssize);
lput(entryvalue()); /* va of entry */
lput(INITTEXT-HEADR); /* va of base of text */
lput(INITDAT); /* va of base of data */
lput(INITDAT+datsize); /* va of base of bss */
lput(~0L); /* gp reg mask */
lput(0L);
lput(0L);
lput(0L);
lput(0L);
lput(~0L); /* gp value ?? */
break;
lputl(0); /* x */
case 1: /* 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(textsize, INITRND)); /* text sizes */
lputl(datsize); /* data sizes */
lputl(bsssize); /* bss sizes */
lput(entryvalue()); /* va of entry */
lputl(INITTEXT); /* text start */
lputl(INITDAT); /* data start */
/*
* text section header
*/
s8put(".text");
lputl(HEADR); /* pa */
lputl(HEADR); /* va */
lputl(textsize); /* 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(INITDAT); /* pa */
lputl(INITDAT); /* va */
lputl(datsize); /* data size */
lputl(HEADR+textsize); /* 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(INITDAT+datsize); /* pa */
lputl(INITDAT+datsize); /* va */
lputl(bsssize); /* 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+textsize+datsize); /* file offset */
lputl(HEADR+textsize+datsize); /* offset of syms */
lputl(HEADR+textsize+datsize+symsize);/* offset of line numbers */
lputl(0); /* relocation, line numbers */
lputl(0x200); /* flags comment only */
break;
case 2: /* plan9 */
magic = 4*11*11+7;
if(dlm)
magic |= 0x80000000;
lput(magic); /* magic */
lput(textsize); /* sizes */
lput(datsize);
lput(bsssize);
lput(symsize); /* nsyms */
lput(entryvalue()); /* va of entry */
lput(spsize); /* sp offsets */
lput(lcsize); /* line offsets */
break;
case 3:
/* MS-DOS .COM */
break;
case 4:
/* fake MS-DOS .EXE */
v = rnd(HEADR+textsize, INITRND)+datsize;
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 6:
asmbmacho(symdatva, symo);
break;
case 7:
case 8:
case 9:
/* elf 386 */
if(HEADTYPE == 8)
debug['d'] = 1;
eh = getElfEhdr();
fo = HEADR;
startva = INITTEXT - HEADR;
va = startva + fo;
w = textsize;
/* This null SHdr must appear before all others */
sh = newElfShdr(elfstr[ElfStrEmpty]);
/* program header info - but not on native client */
pph = nil;
if(HEADTYPE != 8) {
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;
switch(HEADTYPE) {
case 7:
elfinterp(sh, startva, linuxdynld);
break;
case 9:
elfinterp(sh, startva, freebsddynld);
break;
}
ph = newElfPhdr();
ph->type = PT_INTERP;
ph->flags = PF_R;
phsh(ph, sh);
}
ph = newElfPhdr();
ph->type = PT_LOAD;
ph->flags = PF_X+PF_R;
ph->vaddr = va;
ph->paddr = va;
ph->off = fo;
ph->filesz = w;
ph->memsz = w;
ph->align = INITRND;
fo = rnd(fo+w, INITRND);
va = rnd(va+w, INITRND);
w = datsize;
ph = newElfPhdr();
ph->type = PT_LOAD;
ph->flags = PF_W+PF_R;
ph->off = fo;
ph->vaddr = va;
ph->paddr = va;
ph->filesz = w;
ph->memsz = w+bsssize;
ph->align = INITRND;
if(!debug['s'] && HEADTYPE != 8) {
ph = newElfPhdr();
ph->type = PT_LOAD;
ph->flags = PF_W+PF_R;
ph->off = symo;
ph->vaddr = symdatva;
ph->paddr = symdatva;
ph->filesz = 8+symsize+lcsize;
ph->memsz = 8+symsize+lcsize;
ph->align = INITRND;
}
/* 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[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;
fo = ELFRESERVE;
va = startva + fo;
w = textsize;
sh = newElfShdr(elfstr[ElfStrText]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC+SHF_EXECINSTR;
sh->addr = va;
sh->off = fo;
sh->size = w;
sh->addralign = 4;
fo = rnd(fo+w, INITRND);
va = rnd(va+w, INITRND);
w = datsize;
sh = newElfShdr(elfstr[ElfStrData]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_WRITE+SHF_ALLOC;
sh->addr = va;
sh->off = fo;
sh->size = w;
sh->addralign = 4;
fo += w;
va += w;
w = bsssize;
sh = newElfShdr(elfstr[ElfStrBss]);
sh->type = SHT_NOBITS;
sh->flags = SHF_WRITE+SHF_ALLOC;
sh->addr = va;
sh->off = fo;
sh->size = w;
sh->addralign = 4;
if (!debug['s']) {
fo = symo+8;
w = symsize;
sh = newElfShdr(elfstr[ElfStrGosymtab]);
sh->type = SHT_PROGBITS;
sh->off = fo;
sh->size = w;
sh->addralign = 1;
fo += w;
w = lcsize;
sh = newElfShdr(elfstr[ElfStrGopclntab]);
sh->type = SHT_PROGBITS;
sh->off = fo;
sh->size = w;
sh->addralign = 1;
}
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 8:
eh->ident[EI_OSABI] = ELFOSABI_NACL;
eh->ident[EI_ABIVERSION] = 6;
eh->flags = 0x200000; // aligned mod 32
break;
case 9:
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;
}
cflush();
}
void
s8put(char *n)
{
char name[8];
int i;
strncpy(name, n, sizeof(name));
for(i=0; i<sizeof(name); i++)
cput(name[i]);
}
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 s, int32 n)
{
Prog *p;
char *cast;
int32 l, fl, j;
int i, c;
Adr *a;
memset(buf.dbuf, 0, n+Dbufslop);
for(p = datap; p != P; p = p->link) {
a = &p->from;
l = a->sym->value + a->offset - s;
if(l >= n)
continue;
c = a->scale;
i = 0;
if(l < 0) {
if(l+c <= 0)
continue;
i = -l;
l = 0;
}
curp = p;
if(!a->sym->reachable)
diag("unreachable symbol in datblk - %s", a->sym->name);
if(a->sym->type == SMACHO)
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 = (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.scon[i];
l++;
}
break;
default:
fl = p->to.offset;
if(p->to.type == D_SIZE)
fl += p->to.sym->size;
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, fl);
fl += p->to.sym->value;
if(p->to.sym->type != STEXT && p->to.sym->type != SUNDEF)
fl += INITDAT;
if(dlm)
dynreloc(p->to.sym, l+s+INITDAT, 1);
}
}
cast = (char*)&fl;
switch(c) {
default:
diag("bad nuxi %d %d\n%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);
if(!debug['a'])
return;
/*
* a second pass just to print the asm
*/
for(p = datap; p != P; p = p->link) {
a = &p->from;
l = a->sym->value + a->offset - s;
if(l < 0 || l >= n)
continue;
c = a->scale;
i = 0;
switch(p->to.type) {
case D_FCONST:
switch(c) {
default:
case 4:
fl = ieeedtof(&p->to.ieee);
cast = (char*)&fl;
Bprint(&bso, pcstr, l+s+INITDAT);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux", cast[fnuxi4[j]] & 0xff);
Bprint(&bso, "\t%P\n", curp);
break;
case 8:
cast = (char*)&p->to.ieee;
Bprint(&bso, pcstr, l+s+INITDAT);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux", cast[fnuxi8[j]] & 0xff);
Bprint(&bso, "\t%P\n", curp);
break;
}
break;
case D_SCONST:
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);
break;
default:
fl = p->to.offset;
if(p->to.type == D_SIZE)
fl += p->to.sym->size;
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, fl);
fl += p->to.sym->value;
if(p->to.sym->type != STEXT && p->to.sym->type != SUNDEF)
fl += INITDAT;
if(dlm)
dynreloc(p->to.sym, l+s+INITDAT, 1);
}
}
cast = (char*)&fl;
switch(c) {
default:
diag("bad nuxi %d %d\n%P", c, i, curp);
break;
case 1:
Bprint(&bso, pcstr, l+s+INITDAT);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux", cast[inuxi1[j]] & 0xff);
Bprint(&bso, "\t%P\n", curp);
break;
case 2:
Bprint(&bso, pcstr, l+s+INITDAT);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux", cast[inuxi2[j]] & 0xff);
Bprint(&bso, "\t%P\n", curp);
break;
case 4:
Bprint(&bso, pcstr, l+s+INITDAT);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux", cast[inuxi4[j]] & 0xff);
Bprint(&bso, "\t%P\n", curp);
break;
}
break;
}
}
}
int32
rnd(int32 v, int32 r)
{
int32 c;
if(r <= 0)
return v;
v += r - 1;
c = v % r;
if(c < 0)
c += r;
v -= c;
return v;
}
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