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go/src/cmd/6l/asm.c

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// Inferno utils/6l/asm.c
// http://code.google.com/p/inferno-os/source/browse/utils/6l/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"
#include "../ld/lib.h"
#include "../ld/elf.h"
#include "../ld/dwarf.h"
#include "../ld/macho.h"
#define Dbufslop 100
#define PADDR(a) ((uint32)(a) & ~0x80000000)
char linuxdynld[] = "/lib64/ld-linux-x86-64.so.2";
char freebsddynld[] = "/libexec/ld-elf.so.1";
char zeroes[32];
Prog* datsort(Prog *l);
vlong
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(uint16 w)
{
cput(w);
cput(w>>8);
}
void
wputb(uint16 w)
{
cput(w>>8);
cput(w);
}
void
lputb(int32 l)
{
cput(l>>24);
cput(l>>16);
cput(l>>8);
cput(l);
}
void
vputb(uint64 v)
{
lputb(v>>32);
lputb(v);
}
void
lputl(int32 l)
{
cput(l);
cput(l>>8);
cput(l>>16);
cput(l>>24);
}
void
vputl(uint64 v)
{
lputl(v);
lputl(v>>32);
}
void
strnput(char *s, int n)
{
int i;
for(i=0; i<n; i++) {
cput(*s);
if(*s != 0)
s++;
}
}
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 = 8 };
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 = 8 };
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,
ElfStrRela,
ElfStrText,
ElfStrData,
ElfStrBss,
ElfStrGosymcounts,
ElfStrGosymtab,
ElfStrGopclntab,
ElfStrShstrtab,
ElfStrSymtab,
ElfStrStrtab,
NElfStr
};
vlong elfstr[NElfStr];
static int
needlib(char *name)
{
char *p;
Sym *s;
/* reuse hash code in symbol table */
p = smprint(".elfload.%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 != 9)
return;
/* predefine strings we need for section headers */
shstrtab = lookup(".shstrtab", 0);
elfstr[ElfStrEmpty] = addstring(shstrtab, "");
elfstr[ElfStrText] = addstring(shstrtab, ".text");
elfstr[ElfStrData] = addstring(shstrtab, ".data");
elfstr[ElfStrBss] = addstring(shstrtab, ".bss");
if(!debug['s']) {
elfstr[ElfStrGosymcounts] = addstring(shstrtab, ".gosymcounts");
elfstr[ElfStrGosymtab] = addstring(shstrtab, ".gosymtab");
elfstr[ElfStrGopclntab] = addstring(shstrtab, ".gopclntab");
elfstr[ElfStrSymtab] = addstring(shstrtab, ".symtab");
elfstr[ElfStrStrtab] = addstring(shstrtab, ".strtab");
dwarfaddshstrings(shstrtab);
}
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[ElfStrRela] = addstring(shstrtab, ".rela");
/* dynamic symbol table - first entry all zeros */
s = lookup(".dynsym", 0);
s->type = SELFDATA;
s->reachable = 1;
s->value += ELF64SYMSIZE;
/* dynamic string table */
s = lookup(".dynstr", 0);
s->type = SELFDATA;
s->reachable = 1;
s->value += ELF64SYMSIZE;
addstring(s, "");
dynstr = s;
/* relocation table */
s = lookup(".rela", 0);
s->reachable = 1;
s->type = SELFDATA;
/* global offset table */
s = lookup(".got", 0);
s->reachable = 1;
s->type = SELFDATA;
/* got.plt - ??? */
s = lookup(".got.plt", 0);
s->reachable = 1;
s->type = SELFDATA;
/* hash */
s = lookup(".hash", 0);
s->reachable = 1;
s->type = SELFDATA;
/* define dynamic elf table */
s = lookup(".dynamic", 0);
s->reachable = 1;
s->type = SELFDATA;
dynamic = s;
/*
* relocation entries for dynimport 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 != STEXT && s->type != SDATA && s->type != SBSS) || s->dynimpname == nil)
continue;
if(!s->dynexport) {
d = lookup(".rela", 0);
addaddr(d, s);
adduint64(d, ELF64_R_INFO(nsym, R_X86_64_64));
adduint64(d, 0);
}
nsym++;
d = lookup(".dynsym", 0);
adduint32(d, addstring(lookup(".dynstr", 0), s->dynimpname));
/* type */
t = STB_GLOBAL << 4;
if(s->dynexport && s->type == STEXT)
t |= STT_FUNC;
else
t |= STT_OBJECT;
adduint8(d, t);
/* reserved */
adduint8(d, 0);
/* section where symbol is defined */
if(!s->dynexport)
adduint16(d, SHN_UNDEF);
else {
switch(s->type) {
default:
case STEXT:
t = 9;
break;
case SDATA:
t = 10;
break;
case SBSS:
t = 11;
break;
}
adduint16(d, t);
}
/* value */
if(!s->dynexport)
adduint64(d, 0);
else
addaddr(d, s);
/* size of object */
adduint64(d, 0);
if(!s->dynexport && needlib(s->dynimplib))
elfwritedynent(dynamic, DT_NEEDED, addstring(dynstr, s->dynimplib));
}
}
elfdynhash(nsym);
/*
* .dynamic table
*/
s = dynamic;
elfwritedynentsym(s, DT_HASH, lookup(".hash", 0));
elfwritedynentsym(s, DT_SYMTAB, lookup(".dynsym", 0));
elfwritedynent(s, DT_SYMENT, ELF64SYMSIZE);
elfwritedynentsym(s, DT_STRTAB, lookup(".dynstr", 0));
elfwritedynentsymsize(s, DT_STRSZ, lookup(".dynstr", 0));
elfwritedynentsym(s, DT_RELA, lookup(".rela", 0));
elfwritedynentsymsize(s, DT_RELASZ, lookup(".rela", 0));
elfwritedynent(s, DT_RELAENT, ELF64RELASIZE);
if(rpath)
elfwritedynent(s, DT_RUNPATH, addstring(dynstr, rpath));
elfwritedynent(s, DT_NULL, 0);
}
}
void
shsym(ElfShdr *sh, Sym *s)
{
sh->addr = symaddr(s);
sh->off = datoff(sh->addr);
sh->size = s->size;
}
void
phsh(ElfPhdr *ph, ElfShdr *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;
uchar *op1;
vlong vl, va, startva, fo, w, symo, elfsymo, elfstro, elfsymsize, machlink;
vlong symdatva = SYMDATVA;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
ElfShdr *sh;
if(debug['v'])
Bprint(&bso, "%5.2f asmb\n", cputime());
Bflush(&bso);
elftextsh = 0;
elfsymsize = 0;
elfstro = 0;
elfsymo = 0;
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);
for(; op1 < and+Maxand; op1++)
Bprint(&bso, " ");
Bprint(&bso, "%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:
seek(cout, HEADR+textsize, 0);
break;
case 6:
debug['8'] = 1; /* 64-bit addresses */
v = HEADR+textsize;
seek(cout, v, 0);
v = rnd(v, 4096) - v;
while(v > 0) {
cput(0);
v--;
}
cflush();
break;
case 7:
case 9:
debug['8'] = 1; /* 64-bit addresses */
v = rnd(HEADR+textsize, INITRND);
seek(cout, v, 0);
/* index of elf text section; needed by asmelfsym, double-checked below */
/* !debug['d'] causes 8 extra sections before the .text section */
elftextsh = 1;
if(!debug['d'])
elftextsh += 8;
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;
}
datap = datsort(datap);
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 2:
case 5:
debug['s'] = 1;
symo = HEADR+textsize+datsize;
break;
case 6:
symo = rnd(HEADR+textsize, INITRND)+rnd(datsize, INITRND)+machlink;
break;
case 7:
case 9:
symo = rnd(HEADR+textsize, INITRND)+datsize;
symo = rnd(symo, INITRND);
break;
}
/*
* the symbol information is stored as
* 32-bit symbol table size
* 32-bit line number table size
* symbol table
* line number table
*/
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();
if(!debug['s'])
strnput("", INITRND-(8+symsize+lcsize)%INITRND);
cflush();
seek(cout, symo, 0);
lputl(symsize);
lputl(lcsize);
cflush();
if(!debug['s']) {
elfsymo = symo+8+symsize+lcsize;
seek(cout, elfsymo, 0);
asmelfsym();
cflush();
elfstro = seek(cout, 0, 1);
elfsymsize = elfstro - elfsymo;
write(cout, elfstrdat, elfstrsize);
if(debug['v'])
Bprint(&bso, "%5.2f dwarf\n", cputime());
dwarfemitdebugsections();
}
} 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 */
lputb(magic); /* magic */
lputb(textsize); /* sizes */
lputb(datsize);
lputb(bsssize);
lputb(symsize); /* nsyms */
vl = entryvalue();
lputb(PADDR(vl)); /* va of entry */
lputb(spsize); /* sp offsets */
lputb(lcsize); /* line offsets */
vputb(vl); /* va of entry */
break;
case 3: /* plan9 */
magic = 4*26*26+7;
if(dlm)
magic |= 0x80000000;
lputb(magic); /* magic */
lputb(textsize); /* sizes */
lputb(datsize);
lputb(bsssize);
lputb(symsize); /* nsyms */
lputb(entryvalue()); /* va of entry */
lputb(spsize); /* sp offsets */
lputb(lcsize); /* line offsets */
break;
case 6:
asmbmacho(symdatva, symo);
break;
case 7:
case 9:
/* elf amd-64 */
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 */
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 - fo;
ph->paddr = va - fo;
ph->off = 0;
ph->filesz = w + fo;
ph->memsz = w + fo;
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']) {
ph = newElfPhdr();
ph->type = PT_LOAD;
ph->flags = PF_R;
ph->off = symo;
ph->vaddr = symdatva;
ph->paddr = symdatva;
ph->filesz = rnd(8+symsize+lcsize, INITRND);
ph->memsz = rnd(8+symsize+lcsize, INITRND);
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 = 8;
sh->addralign = 8;
shsym(sh, lookup(".got", 0));
sh = newElfShdr(elfstr[ElfStrGotPlt]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC+SHF_WRITE;
sh->entsize = 8;
sh->addralign = 8;
shsym(sh, lookup(".got.plt", 0));
dynsym = eh->shnum;
sh = newElfShdr(elfstr[ElfStrDynsym]);
sh->type = SHT_DYNSYM;
sh->flags = SHF_ALLOC;
sh->entsize = ELF64SYMSIZE;
sh->addralign = 8;
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 = 8;
sh->link = dynsym;
shsym(sh, lookup(".hash", 0));
sh = newElfShdr(elfstr[ElfStrRela]);
sh->type = SHT_RELA;
sh->flags = SHF_ALLOC;
sh->entsize = ELF64RELASIZE;
sh->addralign = 8;
sh->link = dynsym;
shsym(sh, lookup(".rela", 0));
/* sh and PT_DYNAMIC for .dynamic section */
sh = newElfShdr(elfstr[ElfStrDynamic]);
sh->type = SHT_DYNAMIC;
sh->flags = SHF_ALLOC+SHF_WRITE;
sh->entsize = 16;
sh->addralign = 8;
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 = 8;
}
}
ph = newElfPhdr();
ph->type = PT_GNU_STACK;
ph->flags = PF_W+PF_R;
ph->align = 8;
fo = ELFRESERVE;
va = startva + fo;
w = textsize;
if(elftextsh != eh->shnum)
diag("elftextsh = %d, want %d", elftextsh, eh->shnum);
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 = 8;
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 + elfdatsize;
sh->off = fo + elfdatsize;
sh->size = w - elfdatsize;
sh->addralign = 8;
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 = 8;
if (!debug['s']) {
fo = symo;
w = 8;
sh = newElfShdr(elfstr[ElfStrGosymcounts]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC;
sh->off = fo;
sh->size = w;
sh->addralign = 1;
sh->addr = symdatva;
fo += w;
w = symsize;
sh = newElfShdr(elfstr[ElfStrGosymtab]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC;
sh->off = fo;
sh->size = w;
sh->addralign = 1;
sh->addr = symdatva + 8;
fo += w;
w = lcsize;
sh = newElfShdr(elfstr[ElfStrGopclntab]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC;
sh->off = fo;
sh->size = w;
sh->addralign = 1;
sh->addr = symdatva + 8 + symsize;
sh = newElfShdr(elfstr[ElfStrSymtab]);
sh->type = SHT_SYMTAB;
sh->off = elfsymo;
sh->size = elfsymsize;
sh->addralign = 8;
sh->entsize = 24;
sh->link = eh->shnum; // link to strtab
sh = newElfShdr(elfstr[ElfStrStrtab]);
sh->type = SHT_STRTAB;
sh->off = elfstro;
sh->size = elfstrsize;
sh->addralign = 1;
dwarfaddheaders();
}
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';
if(HEADTYPE == 9)
eh->ident[EI_OSABI] = 9;
eh->ident[EI_CLASS] = ELFCLASS64;
eh->ident[EI_DATA] = ELFDATA2LSB;
eh->ident[EI_VERSION] = EV_CURRENT;
eh->type = ET_EXEC;
eh->machine = EM_X86_64;
eh->version = EV_CURRENT;
eh->entry = entryvalue();
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
cflush(void)
{
int n;
n = sizeof(buf.cbuf) - cbc;
if(n)
write(cout, buf.cbuf, n);
cbp = buf.cbuf;
cbc = sizeof(buf.cbuf);
}
/* Current position in file */
vlong
cpos(void)
{
return seek(cout, 0, 1) + sizeof(buf.cbuf) - cbc;
}
void
outa(int n, uchar *cast, uchar *map, vlong l)
{
int i, j;
Bprint(&bso, pcstr, l);
for(i=0; i<n; i++) {
j = i;
if(map != nil)
j = map[j];
Bprint(&bso, "%.2ux", cast[j]);
}
for(; i<Maxand; i++)
Bprint(&bso, " ");
Bprint(&bso, "%P\n", curp);
}
/*
* divide-and-conquer list-link
* sort of Prog* structures.
* Used for the data block.
*/
int
datcmp(Prog *p1, Prog *p2)
{
vlong v1, v2;
v1 = p1->from.offset;
v2 = p2->from.offset;
if(v1 > v2)
return +1;
if(v1 < v2)
return -1;
return 0;
}
Prog*
dsort(Prog *l)
{
Prog *l1, *l2, *le;
if(l == 0 || l->link == 0)
return l;
l1 = l;
l2 = l;
for(;;) {
l2 = l2->link;
if(l2 == 0)
break;
l2 = l2->link;
if(l2 == 0)
break;
l1 = l1->link;
}
l2 = l1->link;
l1->link = 0;
l1 = dsort(l);
l2 = dsort(l2);
/* set up lead element */
if(datcmp(l1, l2) < 0) {
l = l1;
l1 = l1->link;
} else {
l = l2;
l2 = l2->link;
}
le = l;
for(;;) {
if(l1 == 0) {
while(l2) {
le->link = l2;
le = l2;
l2 = l2->link;
}
le->link = 0;
break;
}
if(l2 == 0) {
while(l1) {
le->link = l1;
le = l1;
l1 = l1->link;
}
break;
}
if(datcmp(l1, l2) < 0) {
le->link = l1;
le = l1;
l1 = l1->link;
} else {
le->link = l2;
le = l2;
l2 = l2->link;
}
}
le->link = 0;
return l;
}
static Prog *datp;
Prog*
datsort(Prog *l)
{
Prog *p;
Adr *a;
for(p = l; p != P; p = p->link) {
a = &p->from;
a->offset += a->sym->value;
}
datp = dsort(l);
return datp;
}
void
datblk(int32 s, int32 n)
{
Prog *p;
uchar *cast;
int32 l, fl, j;
vlong o;
int i, c;
Adr *a;
for(p = datp; p != P; p = p->link) {
a = &p->from;
l = a->offset - s;
if(l+a->scale < 0)
continue;
datp = p;
break;
}
memset(buf.dbuf, 0, n+Dbufslop);
for(p = datp; p != P; p = p->link) {
a = &p->from;
l = a->offset - s;
if(l >= n)
break;
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 for %d %d", s, j);
break;
}
}
switch(p->to.type) {
case D_FCONST:
switch(c) {
default:
case 4:
fl = ieeedtof(&p->to.ieee);
cast = (uchar*)&fl;
for(; i<c; i++) {
buf.dbuf[l] = cast[fnuxi4[i]];
l++;
}
break;
case 8:
cast = (uchar*)&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:
o = p->to.offset;
if(p->to.type == D_SIZE)
o += 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, o);
if(p->to.sym->type == Sxxx) {
curtext = p; // show useful name in diag's output
diag("missing symbol %s", p->to.sym->name);
}
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 = (uchar*)&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;
case 8:
cast = (uchar*)&o;
for(; i<c; i++) {
buf.dbuf[l] = cast[inuxi8[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->offset - s;
if(l >= n)
continue;
c = a->scale;
i = 0;
if(l < 0)
continue;
if(a->sym->type == SMACHO)
continue;
switch(p->to.type) {
case D_FCONST:
switch(c) {
default:
case 4:
fl = ieeedtof(&p->to.ieee);
cast = (uchar*)&fl;
outa(c, cast, fnuxi4, l+s+INITDAT);
break;
case 8:
cast = (uchar*)&p->to.ieee;
outa(c, cast, fnuxi8, l+s+INITDAT);
break;
}
break;
case D_SCONST:
outa(c, (uchar*)p->to.scon, nil, l+s+INITDAT);
break;
default:
o = p->to.offset;
if(p->to.type == D_SIZE)
o += p->to.sym->size;
if(p->to.type == D_ADDR) {
if(p->to.sym) {
o += p->to.sym->value;
if(p->to.sym->type != STEXT && p->to.sym->type != SUNDEF)
o += INITDAT;
}
}
fl = o;
cast = (uchar*)&fl;
switch(c) {
case 1:
outa(c, cast, inuxi1, l+s+INITDAT);
break;
case 2:
outa(c, cast, inuxi2, l+s+INITDAT);
break;
case 4:
outa(c, cast, inuxi4, l+s+INITDAT);
break;
case 8:
cast = (uchar*)&o;
outa(c, cast, inuxi8, l+s+INITDAT);
break;
}
break;
}
}
}
vlong
rnd(vlong v, vlong r)
{
vlong 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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