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linker work

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* remove now-unused D_SBIG (was for typestrings)
 * rename elf64.[ch] to elf.[ch]
 * pull in elf headers from FreeBSD instead of writing our own
 * emit non-header ELF data in data section
 * stub out a few more ELF sections needed for dynamic loading

R=r
DELTA=1928  (1237 added, 635 deleted, 56 changed)
OCL=33642
CL=33658
This commit is contained in:
Russ Cox 2009-08-21 13:08:11 -07:00
parent ef45e64afc
commit 0e25c1dc6d
14 changed files with 1148 additions and 581 deletions
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2
src/cmd/6l/6.out.h
View File

@ -822,7 +822,7 @@ enum
D_INDIR, /* additive */
D_SBIG = D_INDIR + D_INDIR,
D_SIZE = D_INDIR + D_INDIR, /* 6l internal */
T_TYPE = 1<<0,
T_INDEX = 1<<1,

6
src/cmd/6l/Makefile
View File

@ -10,7 +10,7 @@ TARG=\
OFILES=\
asm.$O\
compat.$O\
elf64.$O\
elf.$O\
enam.$O\
go.$O\
list.$O\
@ -22,7 +22,7 @@ OFILES=\
HFILES=\
l.h\
../6l/6.out.h\
../ld/elf64.h\
../ld/elf.h\
../6l/compat.h\
@ -42,4 +42,4 @@ install: $(TARG)
go.o: ../ld/go.c
elf64.o: ../ld/elf64.c
elf.o: ../ld/elf.c

519
src/cmd/6l/asm.c
View File

@ -29,7 +29,7 @@
// THE SOFTWARE.
#include "l.h"
#include "../ld/elf64.h"
#include "../ld/elf.h"
#define Dbufslop 100
@ -121,18 +121,276 @@ strnput(char *s, int 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
adduint32(Sym *s, uint32 v)
{
vlong r;
Prog *p;
if(s->type == 0)
s->type = SDATA;
s->reachable = 1;
r = s->value;
p = newdata(s, s->value, 4, D_EXTERN);
s->value += 4;
p->to.type = D_CONST;
p->to.offset = v;
return r;
}
vlong
adduint64(Sym *s, uint64 v)
{
vlong r;
Prog *p;
if(s->type == 0)
s->type = SDATA;
s->reachable = 1;
r = s->value;
p = newdata(s, s->value, 8, D_EXTERN);
s->value += 8;
p->to.type = D_CONST;
p->to.offset = v;
return r;
}
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;
}
int nrela;
enum {
ElfStrEmpty,
ElfStrInterp,
ElfStrHash,
ElfStrGot,
ElfStrGotPlt,
ElfStrDynamic,
ElfStrDynsym,
ElfStrDynstr,
ElfStrRela,
ElfStrText,
ElfStrData,
ElfStrBss,
ElfStrGosymtab,
ElfStrGopclntab,
ElfStrShstrtab,
NElfStr
};
vlong elfstr[NElfStr];
void
doelf(void)
{
Sym *s, *shstrtab;
if(HEADTYPE != 7)
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[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[ElfStrRela] = addstring(shstrtab, ".rela");
/* interpreter string */
s = lookup(".interp", 0);
s->reachable = 1;
s->type = SDATA; // TODO: rodata
addstring(lookup(".interp", 0), linuxdynld);
/* hash table - empty for now */
s = lookup(".hash", 0);
s->type = SDATA; // TODO: rodata
s->reachable = 1;
s->value += 8; // two leading zeros
/* dynamic symbol table - first entry all zeros */
s = lookup(".dynsym", 0);
s->type = SDATA;
s->reachable = 1;
s->value += ELF64SYMSIZE;
/* dynamic string table */
s = lookup(".dynstr", 0);
addstring(s, "");
/* relocation table */
s = lookup(".rela", 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);
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);
elfwritedynent(s, DT_NULL, 0);
}
/*
putc = lookup("main·putc", 0);
if(putc->type != SDATA && putc->type != SBSS)
return;
// smash main.putc with putc
s = lookup(".elfrela", 0);
s->type = SDATA;
s->value = 24;
p = newdata(s, 0, 8, D_EXTERN); // r_offset
p->to.type = D_ADDR;
p->to.index = D_EXTERN;
p->to.sym = putc;
p = newdata(s, 8, 8, D_EXTERN); // r_info
p->to.type = D_CONST;
p->to.offset = ELF64_R_INFO(0, 1); // use 0 as symbol value; 1 is S+A calculation
p = newdata(s, 16, 8, D_EXTERN); // r_addend
p->to.type = D_CONST;
p->to.offset = 1000;
nrela = 1;
*/
}
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, nl;
int a, nl, dynsym;
uchar *op1;
vlong vl, va, startva, fo, w, symo, hashoff, dstrtab, off;
vlong vl, va, startva, fo, w, symo;
vlong symdatva = 0x99LL<<32;
Elf64Hdr *eh;
Elf64PHdr *ph, *pph;
Elf64SHdr *sh;
Elf64_Ehdr *eh;
Elf64_Phdr *ph, *pph;
Elf64_Shdr *sh;
if(debug['v'])
Bprint(&bso, "%5.2f asmb\n", cputime());
@ -200,7 +458,6 @@ asmb(void)
debug['8'] = 1; /* 64-bit addresses */
v = rnd(HEADR+textsize, INITRND);
seek(cout, v, 0);
elf64init();
break;
}
@ -422,143 +679,53 @@ asmb(void)
case 7:
/* elf amd-64 */
eh = getElf64_Ehdr();
fo = 0;
startva = INITTEXT - HEADR;
va = startva;
w = HEADR+textsize;
/* This null SHdr must appear before all others */
sh = newElf64SHdr("");
sh = newElf64_Shdr(elfstr[ElfStrEmpty]);
pph = nil; /* silence compiler */
dstrtab = 0;
/* Dynamic linking sections */
if (!debug['d']) { /* -d suppresses dynamic loader format */
/* P headers */
/* program header info */
pph = newElf64PHdr();
pph = newElf64_Phdr();
pph->type = PT_PHDR;
pph->flags = PF_R + PF_X;
pph->off = ELF64HDRSIZE;
pph->off = eh->ehsize;
pph->vaddr = startva + pph->off;
pph->paddr = startva + pph->off;
pph->align = INITRND;
if(!debug['d']) {
/* interpreter */
ph = newElf64PHdr();
sh = newElf64_Shdr(elfstr[ElfStrInterp]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC;
sh->addralign = 1;
shsym(sh, lookup(".interp", 0));
ph = newElf64_Phdr();
ph->type = PT_INTERP;
ph->flags = PF_R;
ph->off = startelf();
ph->vaddr = startva + ph->off;
ph->paddr = startva + ph->off;
write(cout, linuxdynld, sizeof linuxdynld);
ph->filesz = endelf() - ph->off;
ph->align = 1;
/* S header for interpreter */
sh = newElf64SHdr(".interp");
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC;
sh->off = ph->off;
sh->addr = startva + sh->off;
sh->size = ph->filesz;
sh->addralign = 1;
/* S headers inside dynamic load section */
sh = newElf64SHdr(".hash");
sh->type = SHT_HASH;
sh->flags = SHF_ALLOC;
sh->entsize = 4;
sh->off = startelf();
hashoff = sh->off;
sh->addr = startva + sh->off;
/* temporary hack: 8 zeroes means 0 buckets, 0 chains */
write(cout, zeroes, 8);
sh->size = endelf() - sh->off;
sh->addralign = 8;
sh = newElf64SHdr(".got");
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC+SHF_WRITE;
sh->entsize = 8;
sh->off = startelf();
sh->addr = startva + sh->off;
sh->size = endelf() - sh->off;
sh->addralign = 8;
sh = newElf64SHdr(".got.plt");
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC+SHF_WRITE;
sh->entsize = 8;
sh->off = startelf();
sh->addr = startva + sh->off;
sh->size = endelf() - sh->off;
sh->addralign = 8;
sh = newElf64SHdr(".dynamic");
sh->type = SHT_DYNAMIC;
sh->flags = SHF_ALLOC+SHF_WRITE;
sh->entsize = 16;
sh->addr = startva + sh->off;
sh->off = startelf();
elf64writedynent(DT_HASH, startva+hashoff);
elf64writedynent(DT_SYMTAB, startva);
elf64writedynent(DT_RELA, startva);
elf64writedynent(DT_RELASZ, 0); // size of the whole rela in bytes
elf64writedynent(DT_RELAENT, ELF64RELASIZE);
elf64writedynent(DT_SYMENT, 0);
// elf64writedynent(DT_NEEDED, elf64addstr("libc.so.6"));
/* make space for these now but fill them in later */
cflush();
dstrtab = seek(cout, 0, 1);
elf64writedynent(DT_STRTAB, -1);
elf64writedynent(DT_STRSZ, -1);
elf64writedynent(DT_NULL, 0);
sh->size = endelf() - sh->off;
sh->addralign = 8;
/* PT_DYNAMIC for .dynamic section */
ph = newElf64PHdr();
ph->type = PT_DYNAMIC;
ph->flags = PF_R + PF_W;
ph->off = sh->off;
ph->vaddr = startva + ph->off;
ph->paddr = startva + ph->off;
ph->filesz = sh->size;
ph->memsz = sh->size;
ph->align = 8;
/* PT_LOAD for all dynamic sections */
ph = newElf64PHdr();
ph->type = PT_LOAD;
ph->flags = PF_R + PF_W;
ph->off = 0;
ph->vaddr = startva + ph->off;
ph->paddr = startva + ph->off;
ph->filesz = sh->off + sh->size - ph->off;
ph->memsz = ph->filesz;
ph->align = INITRND;
phsh(ph, sh);
}
ph = newElf64PHdr();
ph = newElf64_Phdr();
ph->type = PT_LOAD;
ph->flags = PF_X+PF_R;
ph->vaddr = va + ELF64RESERVE;
ph->paddr = va + ELF64RESERVE;
ph->off = ELF64RESERVE;
ph->filesz = w - ELF64RESERVE;
ph->memsz = w - ELF64RESERVE;
ph->vaddr = va;
ph->paddr = va;
ph->off = 0;
ph->filesz = w;
ph->memsz = w;
ph->align = INITRND;
fo = rnd(fo+w, INITRND);
va = rnd(va+w, INITRND);
w = datsize;
ph = newElf64PHdr();
ph = newElf64_Phdr();
ph->type = PT_LOAD;
ph->flags = PF_W+PF_R;
ph->off = fo;
@ -569,7 +736,7 @@ asmb(void)
ph->align = INITRND;
if(!debug['s']) {
ph = newElf64PHdr();
ph = newElf64_Phdr();
ph->type = PT_LOAD;
ph->flags = PF_W+PF_R;
ph->off = symo;
@ -580,16 +747,78 @@ asmb(void)
ph->align = INITRND;
}
ph = newElf64PHdr();
/* Dynamic linking sections */
if (!debug['d']) { /* -d suppresses dynamic loader format */
/* S headers for dynamic linking */
sh = newElf64_Shdr(elfstr[ElfStrHash]);
sh->type = SHT_HASH;
sh->flags = SHF_ALLOC;
sh->entsize = 4;
sh->addralign = 8;
// sh->link = xxx;
shsym(sh, lookup(".hash", 0));
sh = newElf64_Shdr(elfstr[ElfStrGot]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC+SHF_WRITE;
sh->entsize = 8;
sh->addralign = 8;
shsym(sh, lookup(".got", 0));
sh = newElf64_Shdr(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 = newElf64_Shdr(elfstr[ElfStrDynsym]);
sh->type = SHT_DYNSYM;
sh->flags = SHF_ALLOC;
sh->entsize = 1;
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 = newElf64_Shdr(elfstr[ElfStrDynstr]);
sh->type = SHT_STRTAB;
sh->flags = SHF_ALLOC;
sh->addralign = 1;
shsym(sh, lookup(".dynstr", 0));
sh = newElf64_Shdr(elfstr[ElfStrRela]);
sh->type = SHT_RELA;
sh->flags = SHF_ALLOC;
sh->addralign = 8;
sh->link = dynsym;
shsym(sh, lookup(".rela", 0));
/* sh and PT_DYNAMIC for .dynamic section */
sh = newElf64_Shdr(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 = newElf64_Phdr();
ph->type = PT_DYNAMIC;
ph->flags = PF_R + PF_W;
phsh(ph, sh);
}
ph = newElf64_Phdr();
ph->type = 0x6474e551; /* GNU_STACK */
ph->flags = PF_W+PF_R;
ph->align = 8;
fo = ELF64RESERVE;
fo = ELFRESERVE;
va = startva + fo;
w = textsize;
sh = newElf64SHdr(".text");
sh = newElf64_Shdr(elfstr[ElfStrText]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_ALLOC+SHF_EXECINSTR;
sh->addr = va;
@ -601,7 +830,7 @@ asmb(void)
va = rnd(va+w, INITRND);
w = datsize;
sh = newElf64SHdr(".data");
sh = newElf64_Shdr(elfstr[ElfStrData]);
sh->type = SHT_PROGBITS;
sh->flags = SHF_WRITE+SHF_ALLOC;
sh->addr = va;
@ -613,7 +842,7 @@ asmb(void)
va += w;
w = bsssize;
sh = newElf64SHdr(".bss");
sh = newElf64_Shdr(elfstr[ElfStrBss]);
sh->type = SHT_NOBITS;
sh->flags = SHF_WRITE+SHF_ALLOC;
sh->addr = va;
@ -625,7 +854,7 @@ asmb(void)
fo = symo+8;
w = symsize;
sh = newElf64SHdr(".gosymtab");
sh = newElf64_Shdr(elfstr[ElfStrGosymtab]);
sh->type = SHT_PROGBITS;
sh->off = fo;
sh->size = w;
@ -635,7 +864,7 @@ asmb(void)
fo += w;
w = lcsize;
sh = newElf64SHdr(".gopclntab");
sh = newElf64_Shdr(elfstr[ElfStrGopclntab]);
sh->type = SHT_PROGBITS;
sh->off = fo;
sh->size = w;
@ -643,27 +872,12 @@ asmb(void)
sh->entsize = 24;
}
sh = newElf64SHdr(".shstrtab");
sh = newElf64_Shstrtab(elfstr[ElfStrShstrtab]);
sh->type = SHT_STRTAB;
sh->off = startelf();
sh->addr = sh->off + startva;
sh->addralign = 1;
elf64writestrtable();
sh->size = endelf() - sh->off;
if(dstrtab != 0) {
// update DT_STRTAB entry
cflush();
off = seek(cout, 0, 1);
seek(cout, dstrtab, 0);
elf64writedynent(DT_STRTAB, sh->addr);
elf64writedynent(DT_STRSZ, sh->size);
cflush();
seek(cout, off, 0);
}
shsym(sh, lookup(".shstrtab", 0));
/* Main header */
eh = getElf64Hdr();
eh->ident[EI_MAG0] = '\177';
eh->ident[EI_MAG1] = 'E';
eh->ident[EI_MAG2] = 'L';
@ -677,18 +891,16 @@ asmb(void)
eh->version = EV_CURRENT;
eh->entry = entryvalue();
if (!debug['d']) {
pph->filesz = eh->phnum * ELF64PHDRSIZE;
pph->filesz = eh->phnum * eh->phentsize;
pph->memsz = pph->filesz;
}
seek(cout, 0, 0);
a = 0;
a += elf64writehdr();
a += elf64writephdrs();
a += elf64writeshdrs();
if (a > ELF64FULLHDRSIZE) {
diag("ELF64FULLHDRSIZE too small:", a);
if (a > ELFRESERVE) {
diag("ELFRESERVE too small: %d > %d", a, ELFRESERVE);
}
cflush();
@ -739,7 +951,7 @@ datblk(int32 s, int32 n)
for(p = datap; p != P; p = p->link) {
curp = p;
if(!p->from.sym->reachable)
sysfatal("unreachable symbol in datblk - %s", p->from.sym->name);
diag("unreachable symbol in datblk - %s", p->from.sym->name);
l = p->from.sym->value + p->from.offset - s;
c = p->from.scale;
i = 0;
@ -795,17 +1007,10 @@ datblk(int32 s, int32 n)
}
break;
case D_SBIG:
if(debug['a'] && i == 0)
outa(c, (uchar*)p->to.sbig, nil, l+s+INITDAT);
for(; i<c; i++) {
buf.dbuf[l] = p->to.sbig[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);

2
src/cmd/6l/elf64.c → src/cmd/6l/elf.c
View File

@ -3,4 +3,4 @@
// license that can be found in the LICENSE file.
#include "l.h"
#include "../ld/elf64.c"
#include "../ld/elf.c"

9
src/cmd/6l/l.h
View File

@ -120,6 +120,7 @@ struct Sym
uchar dupok;
uchar reachable;
vlong value;
vlong size;
int32 sig;
Sym* link;
Prog* text;
@ -358,6 +359,7 @@ EXTERN char* EXPTAB;
EXTERN Prog undefp;
EXTERN vlong textstksiz;
EXTERN vlong textarg;
extern char thechar;
#define UP (&undefp)
@ -373,6 +375,11 @@ int Sconv(Fmt*);
void addhist(int32, int);
void addstackmark(void);
Prog* appendp(Prog*);
vlong addstring(Sym*, char*);
vlong adduint32(Sym*, uint32);
vlong adduint64(Sym*, uint64);
vlong addaddr(Sym*, Sym*);
vlong addsize(Sym*, Sym*);
void asmb(void);
void asmdyn(void);
void asmins(Prog*);
@ -392,6 +399,7 @@ void deadcode(void);
void diag(char*, ...);
void dobss(void);
void dodata(void);
void doelf(void);
void doinit(void);
void doprof1(void);
void doprof2(void);
@ -438,6 +446,7 @@ void strnput(char*, int);
void undef(void);
void undefsym(Sym*);
vlong vaddr(Adr*);
vlong symaddr(Sym*);
void vputl(uint64);
void wputb(uint16);
void wputl(uint16);

7
src/cmd/6l/obj.c
View File

@ -30,7 +30,7 @@
#define EXTERN
#include "l.h"
#include "../ld/elf64.h"
#include "../ld/elf.h"
#include <ar.h>
char *noname = "<none>";
@ -197,7 +197,8 @@ main(int argc, char *argv[])
INITRND = 4096;
break;
case 7: /* elf64 executable */
HEADR = ELF64RESERVE;
elfinit();
HEADR = ELFRESERVE;
if(INITTEXT == -1)
INITTEXT = (1<<22)+HEADR;
if(INITDAT == -1)
@ -389,6 +390,7 @@ main(int argc, char *argv[])
patch();
follow();
doelf();
dodata();
dobss();
dostkoff();
@ -438,7 +440,6 @@ loop:
void
errorexit(void)
{
if(nerrors) {
if(cout >= 0)
remove(outfile);

6
src/cmd/6l/pass.c
View File

@ -73,7 +73,7 @@ dodata(void)
if(s->type != SBSS)
continue;
t = s->value;
if(t == 0) {
if(t == 0 && s->name[0] != '.') {
diag("%s: no size", s->name);
t = 1;
}
@ -83,6 +83,7 @@ dodata(void)
continue;
if(t >= 8)
datsize = rnd(datsize, 8);
s->size = t;
s->value = datsize;
datsize += t;
s->type = SDATA1;
@ -101,6 +102,7 @@ dodata(void)
t = s->value;
if(t >= 8)
datsize = rnd(datsize, 8);
s->size = t;
s->value = datsize;
datsize += t;
}
@ -124,6 +126,7 @@ dodata(void)
if(t > u)
continue;
u -= t;
s->size = t;
s->value = datsize;
s->type = SDATA;
datsize += t;
@ -148,6 +151,7 @@ dobss(void)
if(s->type != SBSS)
continue;
t = s->value;
s->size = t;
if(t >= 8)
bsssize = rnd(bsssize, 8);
s->value = bsssize + datsize;

19
src/cmd/6l/span.c
View File

@ -185,7 +185,7 @@ putsymb(char *s, int t, vlong v, int ver, Sym *go)
gv = 0;
if(go) {
if(!go->reachable)
sysfatal("unreachable type %s", go->name);
diag("unreachable type %s", go->name);
gv = go->value+INITDAT;
}
if(l == 8)
@ -268,7 +268,6 @@ asmsym(void)
/* frame, auto and param after */
putsymb(".frame", 'm', p->to.offset+8, 0, 0);
/* TODO(rsc): Add types for D_AUTO and D_PARAM */
for(a=p->to.autom; a; a=a->link)
if(a->type == D_AUTO)
putsymb(a->asym->name, 'a', -a->aoffset, 0, a->gotype);
@ -673,6 +672,18 @@ put8(vlong v)
andptr += 8;
}
vlong
symaddr(Sym *s)
{
Adr a;
a.type = D_ADDR;
a.index = D_EXTERN;
a.offset = 0;
a.sym = s;
return vaddr(&a);
}
vlong
vaddr(Adr *a)
{
@ -697,14 +708,14 @@ vaddr(Adr *a)
case STEXT:
case SCONST:
if(!s->reachable)
sysfatal("unreachable symbol in vaddr - %s", s->name);
diag("unreachable symbol in vaddr - %s", s->name);
if((uvlong)s->value < (uvlong)INITTEXT)
v += INITTEXT; /* TO DO */
v += s->value;
break;
default:
if(!s->reachable)
sysfatal("unreachable symbol in vaddr - %s", s->name);
diag("unreachable symbol in vaddr - %s", s->name);
v += INITDAT + s->value;
}
}

3
src/cmd/8l/8.out.h
View File

@ -449,8 +449,7 @@ enum
D_INDIR, /* additive */
D_SBIG = D_INDIR + D_INDIR,
D_CONST2,
D_CONST2 = D_INDIR+D_INDIR,
T_TYPE = 1<<0,
T_INDEX = 1<<1,

15
src/cmd/8l/asm.c
View File

@ -700,7 +700,7 @@ datblk(int32 s, int32 n)
for(p = datap; p != P; p = p->link) {
curp = p;
if(!p->from.sym->reachable)
sysfatal("unreachable symbol in datblk - %s", p->from.sym->name);
diag("unreachable symbol in datblk - %s", p->from.sym->name);
l = p->from.sym->value + p->from.offset - s;
c = p->from.scale;
i = 0;
@ -769,19 +769,6 @@ datblk(int32 s, int32 n)
}
break;
case D_SBIG:
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.sbig[i];
l++;
}
break;
default:
fl = p->to.offset;
if(p->to.type == D_ADDR) {

158
src/cmd/ld/elf64.c → src/cmd/ld/elf.c
View File

@ -2,35 +2,52 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Support for 64-bit Elf binaries
#include "../ld/elf64.h"
#include "../ld/elf.h"
/*
* We use the 64-bit data structures on both 32- and 64-bit machines
* in order to write the code just once. The 64-bit data structure is
* written in the 32-bit format on the 32-bit machines.
*/
#define NSECT 16
static int numstr;
static int stroffset;
static Elf64Hdr hdr;
static Elf64PHdr *phdr[NSECT];
static Elf64SHdr *shdr[NSECT];
static int elf64;
static Elf64_Ehdr hdr;
static Elf64_Phdr *phdr[NSECT];
static Elf64_Shdr *shdr[NSECT];
static char *sname[NSECT];
static char *str[20];
/*
Initialize the global variable that describes the ELF header. It will be updated as
we write section and prog headers.
*/
void
elf64init(void)
elfinit(void)
{
switch(thechar) {
// 64-bit architectures
case '6':
elf64 = 1;
hdr.phoff = ELF64HDRSIZE; /* Must be be ELF64HDRSIZE: first PHdr must follow ELF header */
hdr.shoff = ELF64HDRSIZE; /* Will move as we add PHeaders */
hdr.ehsize = ELF64HDRSIZE; /* Must be ELF64HDRSIZE */
hdr.phentsize = ELF64PHDRSIZE; /* Must be ELF64PHDRSIZE */
hdr.shentsize = ELF64SHDRSIZE; /* Must be ELF64SHDRSIZE */
break;
// 32-bit architectures
default:
hdr.phoff = ELF32HDRSIZE; /* Must be be ELF32HDRSIZE: first PHdr must follow ELF header */
hdr.shoff = ELF32HDRSIZE; /* Will move as we add PHeaders */
hdr.ehsize = ELF32HDRSIZE; /* Must be ELF32HDRSIZE */
hdr.phentsize = ELF32PHDRSIZE; /* Must be ELF32PHDRSIZE */
hdr.shentsize = ELF32SHDRSIZE; /* Must be ELF32SHDRSIZE */
}
}
void
elf64phdr(Elf64PHdr *e)
elf64phdr(Elf64_Phdr *e)
{
LPUT(e->type);
LPUT(e->flags);
@ -43,7 +60,7 @@ elf64phdr(Elf64PHdr *e)
}
void
elf64shdr(char *name, Elf64SHdr *e)
elf64shdr(char *name, Elf64_Shdr *e)
{
LPUT(e->name);
LPUT(e->type);
@ -57,44 +74,6 @@ elf64shdr(char *name, Elf64SHdr *e)
VPUT(e->entsize);
}
int
putelf64strtab(char* name)
{
int w;
w = strlen(name)+1;
strnput(name, w);
return w;
}
void
elf64writestrtable(void)
{
int i;
uint32 size;
size = 0;
for (i = 0; i < numstr; i++)
size += putelf64strtab(str[i]);
if (size > STRTABSIZE)
diag("elf64 string table overflow");
}
uint32
elf64addstr(char *name)
{
int r;
if (numstr >= nelem(str)) {
diag("too many elf strings");
return 0;
}
str[numstr++] = strdup(name);
r = stroffset;
stroffset += strlen(name)+1;
return r;
}
uint32
elf64writeshdrs(void)
{
@ -115,10 +94,10 @@ elf64writephdrs(void)
return hdr.phnum * ELF64PHDRSIZE;
}
Elf64PHdr*
newElf64PHdr(void)
Elf64_Phdr*
newElf64_Phdr(void)
{
Elf64PHdr *e;
Elf64_Phdr *e;
e = malloc(sizeof *e);
memset(e, 0, sizeof *e);
@ -130,16 +109,21 @@ newElf64PHdr(void)
return e;
}
Elf64SHdr*
newElf64SHdr(char *name)
Elf64_Shdr*
newElf64_Shstrtab(vlong name)
{
Elf64SHdr *e;
if (strcmp(name, ".shstrtab") == 0)
hdr.shstrndx = hdr.shnum;
return newElf64_Shdr(name);
}
Elf64_Shdr*
newElf64_Shdr(vlong name)
{
Elf64_Shdr *e;
e = malloc(sizeof *e);
memset(e, 0, sizeof *e);
e->name = elf64addstr(name);
e->name = name;
if (hdr.shnum >= NSECT) {
diag("too many shdrs");
} else {
@ -148,8 +132,8 @@ newElf64SHdr(char *name)
return e;
}
Elf64Hdr*
getElf64Hdr(void)
Elf64_Ehdr*
getElf64_Ehdr(void)
{
return &hdr;
}
@ -192,41 +176,33 @@ elf64_hash(uchar *name)
}
void
elf64writedynent(int tag, uint64 val)
elfwritedynent(Sym *s, int tag, uint64 val)
{
VPUT(tag);
VPUT(val);
if(elf64) {
adduint64(s, tag);
adduint64(s, val);
} else {
adduint32(s, tag);
adduint32(s, val);
}
}
/* Where to write the next piece of data attached to an SHeader */
uint64 elfaddr = ELF64FULLHDRSIZE;
/* Mark a start location in the SHeader data */
uint64
startelf(void)
void
elfwritedynentsym(Sym *s, int tag, Sym *t)
{
seek(cout, elfaddr, 0);
return elfaddr;
if(elf64)
adduint64(s, tag);
else
adduint32(s, tag);
addaddr(s, t);
}
/* Mark the end of a location in the SHeader data */
uint64
endelf(void)
void
elfwritedynentsymsize(Sym *s, int tag, Sym *t)
{
uint64 p;
cflush();
p = seek(cout, 0, 1);
if (p < elfaddr) {
diag("endelf before elfaddr");
}
if ((p & 7) != 0) {
p = (p + 7) & ~7LL;
seek(cout, p, 0);
}
elfaddr = p;
if (p > ELF64RESERVE) {
diag("endelf overflows reserve %lld\n", p);
}
return elfaddr;
if(elf64)
adduint64(s, tag);
else
adduint32(s, tag);
addsize(s, t);
}

665
src/cmd/ld/elf.h Normal file
View File

@ -0,0 +1,665 @@
/*
* Derived from:
* $FreeBSD: src/sys/sys/elf32.h,v 1.8.14.1 2005/12/30 22:13:58 marcel Exp $
* $FreeBSD: src/sys/sys/elf64.h,v 1.10.14.1 2005/12/30 22:13:58 marcel Exp $
* $FreeBSD: src/sys/sys/elf_common.h,v 1.15.8.1 2005/12/30 22:13:58 marcel Exp $
*
* Copyright (c) 1996-1998 John D. Polstra. All rights reserved.
* Portions Copyright 2009 The Go Authors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* ELF definitions that are independent of architecture or word size.
*/
/*
* Note header. The ".note" section contains an array of notes. Each
* begins with this header, aligned to a word boundary. Immediately
* following the note header is n_namesz bytes of name, padded to the
* next word boundary. Then comes n_descsz bytes of descriptor, again
* padded to a word boundary. The values of n_namesz and n_descsz do
* not include the padding.
*/
typedef struct {
uint32 n_namesz; /* Length of name. */
uint32 n_descsz; /* Length of descriptor. */
uint32 n_type; /* Type of this note. */
} Elf_Note;
/* Indexes into the e_ident array. Keep synced with
http://www.sco.com/developer/gabi/ch4.eheader.html */
#define EI_MAG0 0 /* Magic number, byte 0. */
#define EI_MAG1 1 /* Magic number, byte 1. */
#define EI_MAG2 2 /* Magic number, byte 2. */
#define EI_MAG3 3 /* Magic number, byte 3. */
#define EI_CLASS 4 /* Class of machine. */
#define EI_DATA 5 /* Data format. */
#define EI_VERSION 6 /* ELF format version. */
#define EI_OSABI 7 /* Operating system / ABI identification */
#define EI_ABIVERSION 8 /* ABI version */
#define OLD_EI_BRAND 8 /* Start of architecture identification. */
#define EI_PAD 9 /* Start of padding (per SVR4 ABI). */
#define EI_NIDENT 16 /* Size of e_ident array. */
/* Values for the magic number bytes. */
#define ELFMAG0 0x7f
#define ELFMAG1 'E'
#define ELFMAG2 'L'
#define ELFMAG3 'F'
#define ELFMAG "\177ELF" /* magic string */
#define SELFMAG 4 /* magic string size */
/* Values for e_ident[EI_VERSION] and e_version. */
#define EV_NONE 0
#define EV_CURRENT 1
/* Values for e_ident[EI_CLASS]. */
#define ELFCLASSNONE 0 /* Unknown class. */
#define ELFCLASS32 1 /* 32-bit architecture. */
#define ELFCLASS64 2 /* 64-bit architecture. */
/* Values for e_ident[EI_DATA]. */
#define ELFDATANONE 0 /* Unknown data format. */
#define ELFDATA2LSB 1 /* 2's complement little-endian. */
#define ELFDATA2MSB 2 /* 2's complement big-endian. */
/* Values for e_ident[EI_OSABI]. */
#define ELFOSABI_NONE 0 /* UNIX System V ABI */
#define ELFOSABI_HPUX 1 /* HP-UX operating system */
#define ELFOSABI_NETBSD 2 /* NetBSD */
#define ELFOSABI_LINUX 3 /* GNU/Linux */
#define ELFOSABI_HURD 4 /* GNU/Hurd */
#define ELFOSABI_86OPEN 5 /* 86Open common IA32 ABI */
#define ELFOSABI_SOLARIS 6 /* Solaris */
#define ELFOSABI_AIX 7 /* AIX */
#define ELFOSABI_IRIX 8 /* IRIX */
#define ELFOSABI_FREEBSD 9 /* FreeBSD */
#define ELFOSABI_TRU64 10 /* TRU64 UNIX */
#define ELFOSABI_MODESTO 11 /* Novell Modesto */
#define ELFOSABI_OPENBSD 12 /* OpenBSD */
#define ELFOSABI_OPENVMS 13 /* Open VMS */
#define ELFOSABI_NSK 14 /* HP Non-Stop Kernel */
#define ELFOSABI_ARM 97 /* ARM */
#define ELFOSABI_STANDALONE 255 /* Standalone (embedded) application */
#define ELFOSABI_SYSV ELFOSABI_NONE /* symbol used in old spec */
#define ELFOSABI_MONTEREY ELFOSABI_AIX /* Monterey */
/* e_ident */
#define IS_ELF(ehdr) ((ehdr).e_ident[EI_MAG0] == ELFMAG0 && \
(ehdr).e_ident[EI_MAG1] == ELFMAG1 && \
(ehdr).e_ident[EI_MAG2] == ELFMAG2 && \
(ehdr).e_ident[EI_MAG3] == ELFMAG3)
/* Values for e_type. */
#define ET_NONE 0 /* Unknown type. */
#define ET_REL 1 /* Relocatable. */
#define ET_EXEC 2 /* Executable. */
#define ET_DYN 3 /* Shared object. */
#define ET_CORE 4 /* Core file. */
#define ET_LOOS 0xfe00 /* First operating system specific. */
#define ET_HIOS 0xfeff /* Last operating system-specific. */
#define ET_LOPROC 0xff00 /* First processor-specific. */
#define ET_HIPROC 0xffff /* Last processor-specific. */
/* Values for e_machine. */
#define EM_NONE 0 /* Unknown machine. */
#define EM_M32 1 /* AT&T WE32100. */
#define EM_SPARC 2 /* Sun SPARC. */
#define EM_386 3 /* Intel i386. */
#define EM_68K 4 /* Motorola 68000. */
#define EM_88K 5 /* Motorola 88000. */
#define EM_860 7 /* Intel i860. */
#define EM_MIPS 8 /* MIPS R3000 Big-Endian only. */
#define EM_S370 9 /* IBM System/370. */
#define EM_MIPS_RS3_LE 10 /* MIPS R3000 Little-Endian. */
#define EM_PARISC 15 /* HP PA-RISC. */
#define EM_VPP500 17 /* Fujitsu VPP500. */
#define EM_SPARC32PLUS 18 /* SPARC v8plus. */
#define EM_960 19 /* Intel 80960. */
#define EM_PPC 20 /* PowerPC 32-bit. */
#define EM_PPC64 21 /* PowerPC 64-bit. */
#define EM_S390 22 /* IBM System/390. */
#define EM_V800 36 /* NEC V800. */
#define EM_FR20 37 /* Fujitsu FR20. */
#define EM_RH32 38 /* TRW RH-32. */
#define EM_RCE 39 /* Motorola RCE. */
#define EM_ARM 40 /* ARM. */
#define EM_SH 42 /* Hitachi SH. */
#define EM_SPARCV9 43 /* SPARC v9 64-bit. */
#define EM_TRICORE 44 /* Siemens TriCore embedded processor. */
#define EM_ARC 45 /* Argonaut RISC Core. */
#define EM_H8_300 46 /* Hitachi H8/300. */
#define EM_H8_300H 47 /* Hitachi H8/300H. */
#define EM_H8S 48 /* Hitachi H8S. */
#define EM_H8_500 49 /* Hitachi H8/500. */
#define EM_IA_64 50 /* Intel IA-64 Processor. */
#define EM_MIPS_X 51 /* Stanford MIPS-X. */
#define EM_COLDFIRE 52 /* Motorola ColdFire. */
#define EM_68HC12 53 /* Motorola M68HC12. */
#define EM_MMA 54 /* Fujitsu MMA. */
#define EM_PCP 55 /* Siemens PCP. */
#define EM_NCPU 56 /* Sony nCPU. */
#define EM_NDR1 57 /* Denso NDR1 microprocessor. */
#define EM_STARCORE 58 /* Motorola Star*Core processor. */
#define EM_ME16 59 /* Toyota ME16 processor. */
#define EM_ST100 60 /* STMicroelectronics ST100 processor. */
#define EM_TINYJ 61 /* Advanced Logic Corp. TinyJ processor. */
#define EM_X86_64 62 /* Advanced Micro Devices x86-64 */
/* Non-standard or deprecated. */
#define EM_486 6 /* Intel i486. */
#define EM_MIPS_RS4_BE 10 /* MIPS R4000 Big-Endian */
#define EM_ALPHA_STD 41 /* Digital Alpha (standard value). */
#define EM_ALPHA 0x9026 /* Alpha (written in the absence of an ABI) */
/* Special section indexes. */
#define SHN_UNDEF 0 /* Undefined, missing, irrelevant. */
#define SHN_LORESERVE 0xff00 /* First of reserved range. */
#define SHN_LOPROC 0xff00 /* First processor-specific. */
#define SHN_HIPROC 0xff1f /* Last processor-specific. */
#define SHN_LOOS 0xff20 /* First operating system-specific. */
#define SHN_HIOS 0xff3f /* Last operating system-specific. */
#define SHN_ABS 0xfff1 /* Absolute values. */
#define SHN_COMMON 0xfff2 /* Common data. */
#define SHN_XINDEX 0xffff /* Escape -- index stored elsewhere. */
#define SHN_HIRESERVE 0xffff /* Last of reserved range. */
/* sh_type */
#define SHT_NULL 0 /* inactive */
#define SHT_PROGBITS 1 /* program defined information */
#define SHT_SYMTAB 2 /* symbol table section */
#define SHT_STRTAB 3 /* string table section */
#define SHT_RELA 4 /* relocation section with addends */
#define SHT_HASH 5 /* symbol hash table section */
#define SHT_DYNAMIC 6 /* dynamic section */
#define SHT_NOTE 7 /* note section */
#define SHT_NOBITS 8 /* no space section */
#define SHT_REL 9 /* relocation section - no addends */
#define SHT_SHLIB 10 /* reserved - purpose unknown */
#define SHT_DYNSYM 11 /* dynamic symbol table section */
#define SHT_INIT_ARRAY 14 /* Initialization function pointers. */
#define SHT_FINI_ARRAY 15 /* Termination function pointers. */
#define SHT_PREINIT_ARRAY 16 /* Pre-initialization function ptrs. */
#define SHT_GROUP 17 /* Section group. */
#define SHT_SYMTAB_SHNDX 18 /* Section indexes (see SHN_XINDEX). */
#define SHT_LOOS 0x60000000 /* First of OS specific semantics */
#define SHT_HIOS 0x6fffffff /* Last of OS specific semantics */
#define SHT_LOPROC 0x70000000 /* reserved range for processor */
#define SHT_HIPROC 0x7fffffff /* specific section header types */
#define SHT_LOUSER 0x80000000 /* reserved range for application */
#define SHT_HIUSER 0xffffffff /* specific indexes */
/* Flags for sh_flags. */
#define SHF_WRITE 0x1 /* Section contains writable data. */
#define SHF_ALLOC 0x2 /* Section occupies memory. */
#define SHF_EXECINSTR 0x4 /* Section contains instructions. */
#define SHF_MERGE 0x10 /* Section may be merged. */
#define SHF_STRINGS 0x20 /* Section contains strings. */
#define SHF_INFO_LINK 0x40 /* sh_info holds section index. */
#define SHF_LINK_ORDER 0x80 /* Special ordering requirements. */
#define SHF_OS_NONCONFORMING 0x100 /* OS-specific processing required. */
#define SHF_GROUP 0x200 /* Member of section group. */
#define SHF_TLS 0x400 /* Section contains TLS data. */
#define SHF_MASKOS 0x0ff00000 /* OS-specific semantics. */
#define SHF_MASKPROC 0xf0000000 /* Processor-specific semantics. */
/* Values for p_type. */
#define PT_NULL 0 /* Unused entry. */
#define PT_LOAD 1 /* Loadable segment. */
#define PT_DYNAMIC 2 /* Dynamic linking information segment. */
#define PT_INTERP 3 /* Pathname of interpreter. */
#define PT_NOTE 4 /* Auxiliary information. */
#define PT_SHLIB 5 /* Reserved (not used). */
#define PT_PHDR 6 /* Location of program header itself. */
#define PT_TLS 7 /* Thread local storage segment */
#define PT_LOOS 0x60000000 /* First OS-specific. */
#define PT_HIOS 0x6fffffff /* Last OS-specific. */
#define PT_LOPROC 0x70000000 /* First processor-specific type. */
#define PT_HIPROC 0x7fffffff /* Last processor-specific type. */
/* Values for p_flags. */
#define PF_X 0x1 /* Executable. */
#define PF_W 0x2 /* Writable. */
#define PF_R 0x4 /* Readable. */
#define PF_MASKOS 0x0ff00000 /* Operating system-specific. */
#define PF_MASKPROC 0xf0000000 /* Processor-specific. */
/* Values for d_tag. */
#define DT_NULL 0 /* Terminating entry. */
#define DT_NEEDED 1 /* String table offset of a needed shared
library. */
#define DT_PLTRELSZ 2 /* Total size in bytes of PLT relocations. */
#define DT_PLTGOT 3 /* Processor-dependent address. */
#define DT_HASH 4 /* Address of symbol hash table. */
#define DT_STRTAB 5 /* Address of string table. */
#define DT_SYMTAB 6 /* Address of symbol table. */
#define DT_RELA 7 /* Address of ElfNN_Rela relocations. */
#define DT_RELASZ 8 /* Total size of ElfNN_Rela relocations. */
#define DT_RELAENT 9 /* Size of each ElfNN_Rela relocation entry. */
#define DT_STRSZ 10 /* Size of string table. */
#define DT_SYMENT 11 /* Size of each symbol table entry. */
#define DT_INIT 12 /* Address of initialization function. */
#define DT_FINI 13 /* Address of finalization function. */
#define DT_SONAME 14 /* String table offset of shared object
name. */
#define DT_RPATH 15 /* String table offset of library path. [sup] */
#define DT_SYMBOLIC 16 /* Indicates "symbolic" linking. [sup] */
#define DT_REL 17 /* Address of ElfNN_Rel relocations. */
#define DT_RELSZ 18 /* Total size of ElfNN_Rel relocations. */
#define DT_RELENT 19 /* Size of each ElfNN_Rel relocation. */
#define DT_PLTREL 20 /* Type of relocation used for PLT. */
#define DT_DEBUG 21 /* Reserved (not used). */
#define DT_TEXTREL 22 /* Indicates there may be relocations in
non-writable segments. [sup] */
#define DT_JMPREL 23 /* Address of PLT relocations. */
#define DT_BIND_NOW 24 /* [sup] */
#define DT_INIT_ARRAY 25 /* Address of the array of pointers to
initialization functions */
#define DT_FINI_ARRAY 26 /* Address of the array of pointers to
termination functions */
#define DT_INIT_ARRAYSZ 27 /* Size in bytes of the array of
initialization functions. */
#define DT_FINI_ARRAYSZ 28 /* Size in bytes of the array of
terminationfunctions. */
#define DT_RUNPATH 29 /* String table offset of a null-terminated
library search path string. */
#define DT_FLAGS 30 /* Object specific flag values. */
#define DT_ENCODING 32 /* Values greater than or equal to DT_ENCODING
and less than DT_LOOS follow the rules for
the interpretation of the d_un union
as follows: even == 'd_ptr', even == 'd_val'
or none */
#define DT_PREINIT_ARRAY 32 /* Address of the array of pointers to
pre-initialization functions. */
#define DT_PREINIT_ARRAYSZ 33 /* Size in bytes of the array of
pre-initialization functions. */
#define DT_LOOS 0x6000000d /* First OS-specific */
#define DT_HIOS 0x6ffff000 /* Last OS-specific */
#define DT_LOPROC 0x70000000 /* First processor-specific type. */
#define DT_HIPROC 0x7fffffff /* Last processor-specific type. */
/* Values for DT_FLAGS */
#define DF_ORIGIN 0x0001 /* Indicates that the object being loaded may
make reference to the $ORIGIN substitution
string */
#define DF_SYMBOLIC 0x0002 /* Indicates "symbolic" linking. */
#define DF_TEXTREL 0x0004 /* Indicates there may be relocations in
non-writable segments. */
#define DF_BIND_NOW 0x0008 /* Indicates that the dynamic linker should
process all relocations for the object
containing this entry before transferring
control to the program. */
#define DF_STATIC_TLS 0x0010 /* Indicates that the shared object or
executable contains code using a static
thread-local storage scheme. */
/* Values for n_type. Used in core files. */
#define NT_PRSTATUS 1 /* Process status. */
#define NT_FPREGSET 2 /* Floating point registers. */
#define NT_PRPSINFO 3 /* Process state info. */
/* Symbol Binding - ELFNN_ST_BIND - st_info */
#define STB_LOCAL 0 /* Local symbol */
#define STB_GLOBAL 1 /* Global symbol */
#define STB_WEAK 2 /* like global - lower precedence */
#define STB_LOOS 10 /* Reserved range for operating system */
#define STB_HIOS 12 /* specific semantics. */
#define STB_LOPROC 13 /* reserved range for processor */
#define STB_HIPROC 15 /* specific semantics. */
/* Symbol type - ELFNN_ST_TYPE - st_info */
#define STT_NOTYPE 0 /* Unspecified type. */
#define STT_OBJECT 1 /* Data object. */
#define STT_FUNC 2 /* Function. */
#define STT_SECTION 3 /* Section. */
#define STT_FILE 4 /* Source file. */
#define STT_COMMON 5 /* Uninitialized common block. */
#define STT_TLS 6 /* TLS object. */
#define STT_LOOS 10 /* Reserved range for operating system */
#define STT_HIOS 12 /* specific semantics. */
#define STT_LOPROC 13 /* reserved range for processor */
#define STT_HIPROC 15 /* specific semantics. */
/* Symbol visibility - ELFNN_ST_VISIBILITY - st_other */
#define STV_DEFAULT 0x0 /* Default visibility (see binding). */
#define STV_INTERNAL 0x1 /* Special meaning in relocatable objects. */
#define STV_HIDDEN 0x2 /* Not visible. */
#define STV_PROTECTED 0x3 /* Visible but not preemptible. */
/* Special symbol table indexes. */
#define STN_UNDEF 0 /* Undefined symbol index. */
/*
* ELF definitions common to all 32-bit architectures.
*/
typedef uint32 Elf32_Addr;
typedef uint16 Elf32_Half;
typedef uint32 Elf32_Off;
typedef int32 Elf32_Sword;
typedef uint32 Elf32_Word;
typedef Elf32_Word Elf32_Hashelt;
/* Non-standard class-dependent datatype used for abstraction. */
typedef Elf32_Word Elf32_Size;
typedef Elf32_Sword Elf32_Ssize;
/*
* ELF header.
*/
typedef struct {
unsigned char ident[EI_NIDENT]; /* File identification. */
Elf32_Half type; /* File type. */
Elf32_Half machine; /* Machine architecture. */
Elf32_Word version; /* ELF format version. */
Elf32_Addr entry; /* Entry point. */
Elf32_Off phoff; /* Program header file offset. */
Elf32_Off shoff; /* Section header file offset. */
Elf32_Word flags; /* Architecture-specific flags. */
Elf32_Half ehsize; /* Size of ELF header in bytes. */
Elf32_Half phentsize; /* Size of program header entry. */
Elf32_Half phnum; /* Number of program header entries. */
Elf32_Half shentsize; /* Size of section header entry. */
Elf32_Half shnum; /* Number of section header entries. */
Elf32_Half shstrndx; /* Section name strings section. */
} Elf32_Ehdr;
/*
* Section header.
*/
typedef struct {
Elf32_Word name; /* Section name (index into the
section header string table). */
Elf32_Word type; /* Section type. */
Elf32_Word flags; /* Section flags. */
Elf32_Addr vaddr; /* Address in memory image. */
Elf32_Off off; /* Offset in file. */
Elf32_Word size; /* Size in bytes. */
Elf32_Word link; /* Index of a related section. */
Elf32_Word info; /* Depends on section type. */
Elf32_Word addralign; /* Alignment in bytes. */
Elf32_Word entsize; /* Size of each entry in section. */
} Elf32_Shdr;
/*
* Program header.
*/
typedef struct {
Elf32_Word type; /* Entry type. */
Elf32_Off off; /* File offset of contents. */
Elf32_Addr vaddr; /* Virtual address in memory image. */
Elf32_Addr paddr; /* Physical address (not used). */
Elf32_Word filesz; /* Size of contents in file. */
Elf32_Word memsz; /* Size of contents in memory. */
Elf32_Word flags; /* Access permission flags. */
Elf32_Word align; /* Alignment in memory and file. */
} Elf32_Phdr;
/*
* Dynamic structure. The ".dynamic" section contains an array of them.
*/
typedef struct {
Elf32_Sword d_tag; /* Entry type. */
union {
Elf32_Word d_val; /* Integer value. */
Elf32_Addr d_ptr; /* Address value. */
} d_un;
} Elf32_Dyn;
/*
* Relocation entries.
*/
/* Relocations that don't need an addend field. */
typedef struct {
Elf32_Addr off; /* Location to be relocated. */
Elf32_Word info; /* Relocation type and symbol index. */
} Elf32_Rel;
/* Relocations that need an addend field. */
typedef struct {
Elf32_Addr off; /* Location to be relocated. */
Elf32_Word info; /* Relocation type and symbol index. */
Elf32_Sword addend; /* Addend. */
} Elf32_Rela;
/* Macros for accessing the fields of r_info. */
#define ELF32_R_SYM(info) ((info) >> 8)
#define ELF32_R_TYPE(info) ((unsigned char)(info))
/* Macro for constructing r_info from field values. */
#define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
/*
* Symbol table entries.
*/
typedef struct {
Elf32_Word name; /* String table index of name. */
Elf32_Addr value; /* Symbol value. */
Elf32_Word size; /* Size of associated object. */
unsigned char info; /* Type and binding information. */
unsigned char other; /* Reserved (not used). */
Elf32_Half shndx; /* Section index of symbol. */
} Elf32_Sym;
/* Macros for accessing the fields of st_info. */
#define ELF32_ST_BIND(info) ((info) >> 4)
#define ELF32_ST_TYPE(info) ((info) & 0xf)
/* Macro for constructing st_info from field values. */
#define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
/* Macro for accessing the fields of st_other. */
#define ELF32_ST_VISIBILITY(oth) ((oth) & 0x3)
/*
* ELF definitions common to all 64-bit architectures.
*/
typedef uint64 Elf64_Addr;
typedef uint16 Elf64_Half;
typedef uint64 Elf64_Off;
typedef int32 Elf64_Sword;
typedef int64 Elf64_Sxword;
typedef uint32 Elf64_Word;
typedef uint64 Elf64_Xword;
/*
* Types of dynamic symbol hash table bucket and chain elements.
*
* This is inconsistent among 64 bit architectures, so a machine dependent
* typedef is required.
*/
#ifdef __alpha__
typedef Elf64_Off Elf64_Hashelt;
#else
typedef Elf64_Word Elf64_Hashelt;
#endif
/* Non-standard class-dependent datatype used for abstraction. */
typedef Elf64_Xword Elf64_Size;
typedef Elf64_Sxword Elf64_Ssize;
/*
* ELF header.
*/
typedef struct {
unsigned char ident[EI_NIDENT]; /* File identification. */
Elf64_Half type; /* File type. */
Elf64_Half machine; /* Machine architecture. */
Elf64_Word version; /* ELF format version. */
Elf64_Addr entry; /* Entry point. */
Elf64_Off phoff; /* Program header file offset. */
Elf64_Off shoff; /* Section header file offset. */
Elf64_Word flags; /* Architecture-specific flags. */
Elf64_Half ehsize; /* Size of ELF header in bytes. */
Elf64_Half phentsize; /* Size of program header entry. */
Elf64_Half phnum; /* Number of program header entries. */
Elf64_Half shentsize; /* Size of section header entry. */
Elf64_Half shnum; /* Number of section header entries. */
Elf64_Half shstrndx; /* Section name strings section. */
} Elf64_Ehdr;
/*
* Section header.
*/
typedef struct {
Elf64_Word name; /* Section name (index into the
section header string table). */
Elf64_Word type; /* Section type. */
Elf64_Xword flags; /* Section flags. */
Elf64_Addr addr; /* Address in memory image. */
Elf64_Off off; /* Offset in file. */
Elf64_Xword size; /* Size in bytes. */
Elf64_Word link; /* Index of a related section. */
Elf64_Word info; /* Depends on section type. */
Elf64_Xword addralign; /* Alignment in bytes. */
Elf64_Xword entsize; /* Size of each entry in section. */
} Elf64_Shdr;
/*
* Program header.
*/
typedef struct {
Elf64_Word type; /* Entry type. */
Elf64_Word flags; /* Access permission flags. */
Elf64_Off off; /* File offset of contents. */
Elf64_Addr vaddr; /* Virtual address in memory image. */
Elf64_Addr paddr; /* Physical address (not used). */
Elf64_Xword filesz; /* Size of contents in file. */
Elf64_Xword memsz; /* Size of contents in memory. */
Elf64_Xword align; /* Alignment in memory and file. */
} Elf64_Phdr;
/*
* Dynamic structure. The ".dynamic" section contains an array of them.
*/
typedef struct {
Elf64_Sxword d_tag; /* Entry type. */
union {
Elf64_Xword d_val; /* Integer value. */
Elf64_Addr d_ptr; /* Address value. */
} d_un;
} Elf64_Dyn;
/*
* Relocation entries.
*/
/* Relocations that don't need an addend field. */
typedef struct {
Elf64_Addr off; /* Location to be relocated. */
Elf64_Xword info; /* Relocation type and symbol index. */
} Elf64_Rel;
/* Relocations that need an addend field. */
typedef struct {
Elf64_Addr off; /* Location to be relocated. */
Elf64_Xword info; /* Relocation type and symbol index. */
Elf64_Sxword addend; /* Addend. */
} Elf64_Rela;
/* Macros for accessing the fields of r_info. */
#define ELF64_R_SYM(info) ((info) >> 32)
#define ELF64_R_TYPE(info) ((info) & 0xffffffffL)
/* Macro for constructing r_info from field values. */
#define ELF64_R_INFO(sym, type) (((sym) << 32) + ((type) & 0xffffffffL))
/*
* Symbol table entries.
*/
typedef struct {
Elf64_Word name; /* String table index of name. */
unsigned char info; /* Type and binding information. */
unsigned char other; /* Reserved (not used). */
Elf64_Half shndx; /* Section index of symbol. */
Elf64_Addr value; /* Symbol value. */
Elf64_Xword size; /* Size of associated object. */
} Elf64_Sym;
/* Macros for accessing the fields of st_info. */
#define ELF64_ST_BIND(info) ((info) >> 4)
#define ELF64_ST_TYPE(info) ((info) & 0xf)
/* Macro for constructing st_info from field values. */
#define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
/* Macro for accessing the fields of st_other. */
#define ELF64_ST_VISIBILITY(oth) ((oth) & 0x3)
/*
* Go linker interface
*/
#define ELF64HDRSIZE 64
#define ELF64PHDRSIZE 56
#define ELF64SHDRSIZE 64
#define ELF64RELSIZE 16
#define ELF64RELASIZE 24
#define ELF64SYMSIZE sizeof(Elf64_Sym)
#define ELF32HDRSIZE sizeof(Elf32_Ehdr)
#define ELF32PHDRSIZE sizeof(Elf32_Phdr)
#define ELF32SHDRSIZE sizeof(Elf32_Shdr)
void elfinit(void);
Elf64_Ehdr *getElf64_Ehdr();
Elf64_Shdr *newElf64_Shstrtab(vlong);
Elf64_Shdr *newElf64_Shdr(vlong);
Elf64_Phdr *newElf64_Phdr();
uint32 elf64writehdr(void);
uint32 elf64writephdrs(void);
uint32 elf64writeshdrs(void);
void elfwritedynent(Sym*, int, uint64);
void elfwritedynentsym(Sym*, int, Sym*);
void elfwritedynentsymsize(Sym*, int, Sym*);
uint32 elf64_hash(uchar*);
uint64 startelf(void);
uint64 endelf(void);
extern int nume64phdr;
extern int nume64shdr;
/*
* Total amount of ELF space to reserve at the start of the file
* for Header, PHeaders, and SHeaders.
* May waste some.
*/
#define ELFRESERVE 2048

292
src/cmd/ld/elf64.h
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@ -1,292 +0,0 @@
/*
* Derived from:
* $FreeBSD: src/sys/sys/elf32.h,v 1.8.14.1 2005/12/30 22:13:58 marcel Exp $
* $FreeBSD: src/sys/sys/elf64.h,v 1.10.14.1 2005/12/30 22:13:58 marcel Exp $
* $FreeBSD: src/sys/sys/elf_common.h,v 1.15.8.1 2005/12/30 22:13:58 marcel Exp $
* $FreeBSD: src/sys/alpha/include/elf.h,v 1.14 2003/09/25 01:10:22 peter Exp $
* $FreeBSD: src/sys/amd64/include/elf.h,v 1.18 2004/08/03 08:21:48 dfr Exp $
* $FreeBSD: src/sys/arm/include/elf.h,v 1.5.2.1 2006/06/30 21:42:52 cognet Exp $
* $FreeBSD: src/sys/i386/include/elf.h,v 1.16 2004/08/02 19:12:17 dfr Exp $
* $FreeBSD: src/sys/powerpc/include/elf.h,v 1.7 2004/11/02 09:47:01 ssouhlal Exp $
* $FreeBSD: src/sys/sparc64/include/elf.h,v 1.12 2003/09/25 01:10:26 peter Exp $
*
* Copyright (c) 1996-1998 John D. Polstra. All rights reserved.
* Copyright (c) 2001 David E. O'Brien
* Portions Copyright 2009 The Go Authors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
typedef uint64 Elf64_Addr; /* Unsigned program address */
typedef uint64 Elf64_Off; /* Unsigned file offset */
typedef uint16 Elf64_Half; /* Unsigned medium integer */
typedef uint32 Elf64_Word; /* Unsigned integer */
typedef int32 Elf64_Sword; /* Signed integer */
typedef uint64 Elf64_Xword; /* Unsigned long integer */
typedef int64 Elf64_Sxword; /* Signed long integer */
typedef struct Elf64Hdr Elf64Hdr;
typedef struct Elf64SHdr Elf64SHdr;
typedef struct Elf64PHdr Elf64PHdr;
#define EI_NIDENT 16
struct Elf64Hdr
{
uchar ident[EI_NIDENT]; /* ELF identification */
Elf64_Half type; /* Object file type */
Elf64_Half machine; /* Machine type */
Elf64_Word version; /* Object file version */
Elf64_Addr entry; /* Entry point address */
Elf64_Off phoff; /* Program header offset */
Elf64_Off shoff; /* Section header offset */
Elf64_Word flags; /* Processor-specific flags */
Elf64_Half ehsize; /* ELF header size */
Elf64_Half phentsize; /* Size of program header entry */
Elf64_Half phnum; /* Number of program header entries */
Elf64_Half shentsize; /* Size of section header entry */
Elf64_Half shnum; /* Number of section header entries */
Elf64_Half shstrndx; /* Section name string table index */
};
#define ELF64HDRSIZE 64
/* E ident indexes */
#define EI_MAG0 0 /* File identification */
#define EI_MAG1 1
#define EI_MAG2 2
#define EI_MAG3 3
#define EI_CLASS 4 /* File class */
#define EI_DATA 5 /* Data encoding */
#define EI_VERSION 6 /* File version */
#define EI_OSABI 7 /* OS/ABI identification */
#define EI_ABIVERSION 8 /* ABI version */
#define EI_PAD 9 /*Start of padding bytes */
/* E types */
#define ET_NONE 0 /* No file type */
#define ET_REL 1 /* Relocatable object file */
#define ET_EXEC 2 /* Executable file */
#define ET_DYN 3 /* Shared object file */
#define ET_CORE 4 /* Core file */
#define ET_LOOS 0xFE00 /* Environment-specific use */
#define ET_HIOS 0xFEFF
#define ET_LOPROC 0xFF00 /* Processor-specific use */
#define ET_HIPROC 0xFFFF
/* E classes */
#define ELFCLASS32 1 /* 32-bit objects */
#define ELFCLASS64 2 /* 64-bit objects */
/* E endians */
#define ELFDATA2LSB 1 /* little-endian */
#define ELFDATA2MSB 2 /* big-endian */
#define EV_CURRENT 1 /* current version of format */
struct Elf64PHdr
{
Elf64_Word type; /* Type of segment */
Elf64_Word flags; /* Segment attributes */
Elf64_Off off; /* Offset in file */
Elf64_Addr vaddr; /* Virtual address in memory */
Elf64_Addr paddr; /* Reserved */
Elf64_Xword filesz; /* Size of segment in file */
Elf64_Xword memsz; /* Size of segment in memory */
Elf64_Xword align; /* Alignment of segment */
};
#define ELF64PHDRSIZE 56
/* P types */
#define PT_NULL 0 /* Unused entry */
#define PT_LOAD 1 /* Loadable segment */
#define PT_DYNAMIC 2 /* Dynamic linking tables */
#define PT_INTERP 3 /* Program interpreter path name */
#define PT_NOTE 4 /* Note sections */
#define PT_PHDR 6 /* Program header table */
/* P flags */
#define PF_X 0x1 /* Execute permission */
#define PF_W 0x2 /* Write permission */
#define PF_R 0x4 /* Read permission */
#define PF_MASKOS 0x00FF0000 /* reserved for environment-specific use */
#define PF_MASKPROC 0xFF000000 /*reserved for processor-specific use */
struct Elf64SHdr
{
Elf64_Word name; /* Section name */
Elf64_Word type; /* Section type */
Elf64_Xword flags; /* Section attributes */
Elf64_Addr addr; /* Virtual address in memory */
Elf64_Off off; /* Offset in file */
Elf64_Xword size; /* Size of section */
Elf64_Word link; /* Link to other section */
Elf64_Word info; /* Miscellaneous information */
Elf64_Xword addralign; /* Address alignment boundary */
Elf64_Xword entsize; /* Size of entries, if section has table */
};
#define ELF64SHDRSIZE 64
/* S types */
#define SHT_NULL 0 /* Unused section header */
#define SHT_PROGBITS 1 /* Information defined by the program */
#define SHT_SYMTAB 2 /* Linker symbol table */
#define SHT_STRTAB 3 /* String table */
#define SHT_RELA 4 /* "Rela" type relocation entries */
#define SHT_HASH 5 /* Symbol hash table */
#define SHT_DYNAMIC 6 /* Dynamic linking tables */
#define SHT_NOTE 7 /* Note information */
#define SHT_NOBITS 8 /* Uninitialized space; does not occupy any space in the file */
#define SHT_REL 9 /* "Rel" type relocation entries */
#define SHT_SHLIB 10 /* Reserved */
#define SHT_DYNSYM 11 /* A dynamic loader symbol table */
#define SHT_LOOS 0x60000000 /* Environment-specific use */
#define SHT_HIOS 0x6FFFFFFF
#define SHT_LOPROC 0x70000000 /* Processor-specific use */
#define SHT_HIPROC 0x7FFFFFFF
/* S flags */
#define SHF_WRITE 0x1 /* Writable data */
#define SHF_ALLOC 0x2 /* Allocated in memory image of program */
#define SHF_EXECINSTR 0x4 /* Executable instructions */
#define SHF_MASKOS 0x0F000000 /* Environment-specific use */
#define SHF_MASKPROC 0xF0000000 /* Processor-specific use */
typedef struct Elf64Dyn Elf64Dyn;
struct Elf64Dyn
{
Elf64_Sxword d_tag;
union {
Elf64_Xword d_val;
Elf64_Addr d_ptr;
} d_un;
};
/* Dyn table entries */
#define DT_NULL 0 /* ignored: Marks the end of the dynamic array */
#define DT_NEEDED 1 /* d_val: The string table offset of the name of
a needed library. */
#define DT_PLTRELSZ 2 /* d_val: Total size, in bytes, of the relocation
entries associated with the procedure linkage table. */
#define DT_PLTGOT 3 /* d_ptr: Contains an address associated with the linkage
table. The specific meaning of this field is
processor-dependent. */
#define DT_HASH 4 /* d_ptr: Address of the symbol hash table. */
#define DT_STRTAB 5 /* d_ptr: Address of the dynamic string table. */
#define DT_SYMTAB 6 /* d_ptr: Address of the dynamic symbol table. */
#define DT_RELA 7 /* d_ptr Address of a relocation table with Elf64_Rela
entries. */
#define DT_RELASZ 8 /* d_val: Total size, in bytes, of the DT_RELA relocation
table. */
#define DT_RELAENT 9 /* d_val: Size, in bytes, of each DT_RELA relocation
entry. */
#define DT_STRSZ 10 /* d_val: Total size, in bytes, of the string table. */
#define DT_SYMENT 11 /* d_val: Size, in bytes, of each symbol table entry. */
#define DT_INIT 12 /* d_ptr Address of the initialization function. */
#define DT_FINI 13 /* d_ptr Address of the termination function. */
#define DT_SONAME 14 /* d_val The string table offset of the name of this
shared object. */
#define DT_RPATH 15 /* d_val The string table offset of a shared library
search path string. */
#define DT_SYMBOLIC 16 /* ignored The presence of this dynamic table entry
modifies the symbol resolution algorithm for references
within the library. Symbols defined within the library
are used to resolve references before the dynamic
linker searches the usual search path. */
#define DT_REL 17 /* d_ptr Address of a relocation table with Elf64_Rel
entries. */
#define DT_RELSZ 18 /* d_val Total size, in bytes, of the DT_REL relocation
table. */
#define DT_RELENT 19 /* d_val Size, in bytes, of each DT_REL relocation
entry. */
#define DT_PLTREL 20 /* d_val Type of relocation entry used for the procedure
linkage table. The d_val member contains either DT_REL
or DT_RELA. */
#define DT_DEBUG 21 /* d_ptr Reserved for debugger use. */
#define DT_TEXTREL 22 /* ignored The presence of this dynamic table entry
signals that the relocation table contains relocations
for a non-writable segment. */
#define DT_JMPREL 23 /* d_ptr Address of the relocations associated with the
procedure linkage table. */
#define DT_BIND_NOW 24 /* ignored The presence of this dynamic table entry
signals that the dynamic loader should process all
relocations for this object before transferring
control to the program. */
#define DT_INIT_ARRAY 25 /* d_ptr Pointer to an array of pointers to initialization
functions. */
#define DT_FINI_ARRAY 26 /* d_ptr Pointer to an array of pointers to termination
functions. */
#define DT_INIT_ARRAYSZ 27 /* d_val Size, in bytes, of the array of initialization
functions. */
#define DT_FINI_ARRAYSZ 28 /* d_val Size, in bytes, of the array of termination
functions. */
#define DT_LOOS 0x60000000 /* Defines a range of dynamic table tags that are reserved
for environment-specific use. */
#define DT_HIOS 0x6FFFFFFF
#define DT_LOPROC 0x70000000 /* Defines a range of dynamic table tags that are
reserved for processor-specific use. */
#define DT_HIPROC 0x7FFFFFFF
typedef struct Elf64_Rel Elf64_Rel;
struct Elf64_Rel
{
Elf64_Addr r_offset; /* Address of reference */
Elf64_Xword r_info; /* Symbol index and type of relocation */
};
#define ELF64RELSIZE 8
typedef struct Elf64_Rela Elf64_Rela;
struct Elf64_Rela
{
Elf64_Addr r_offset; /* Address of reference */
Elf64_Xword r_info; /* Symbol index and type of relocation */
Elf64_Sxword r_addend; /* Constant part of expression */
};
#define ELF64RELASIZE 24
#define ELF64_R_SYM(i) ((i) >> 32)
#define ELF64_R_TYPE(i) ((i) & 0xffffffffL)
#define ELF64_R_INFO(s, t) (((s) << 32) + ((t) & 0xffffffffL))
void elf64init(void);
Elf64Hdr *getElf64Hdr();
Elf64SHdr *newElf64SHdr(char*);
Elf64PHdr *newElf64PHdr();
uint32 elf64writehdr(void);
uint32 elf64writephdrs(void);
uint32 elf64writeshdrs(void);
uint32 elf64addstr(char*);
void elf64writestrtable(void);
void elf64writedynent(int, uint64);
uint32 elf64_hash(uchar*);
uint64 startelf(void);
uint64 endelf(void);
extern int nume64phdr;
extern int nume64shdr;
#define STRTABSIZE 256
/* Amount of space available for Header, PHeaders and SHeaders */
#define ELF64FULLHDRSIZE 2048
/* Space reserved after ELF64FULLHEADERSIZE for dynamic info */
#define ELFDYNAMICSIZE 256
/* Total amount of ELF space to reserve at the start of the file; may waste some */
#define ELF64RESERVE 4096

2
src/cmd/ld/go.c
View File

@ -325,6 +325,8 @@ marktext(Prog *p)
markdepth++;
if(debug['v'] > 1)
Bprint(&bso, "%d marktext %s\n", markdepth, p->from.sym->name);
for(a=p->to.autom; a; a=a->link)
mark(a->gotype);
for(p=p->link; p != P; p=p->link) {
if(p->as == ATEXT || p->as == ADATA || p->as == AGLOBL)
break;