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5l, 8l: add ELF symbol table to binary

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Should have been added long ago.
Thanks to Alex Brainman for noticing.

R=ken2
CC=golang-dev
https://golang.org/cl/4538046
This commit is contained in:
Russ Cox 2011-05-11 23:59:36 -04:00
parent 4fca395321
commit 70798eaad6
5 changed files with 111 additions and 27 deletions
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68
src/cmd/5l/asm.c
View File

@ -73,6 +73,8 @@ enum {
ElfStrGosymcounts,
ElfStrGosymtab,
ElfStrGopclntab,
ElfStrSymtab,
ElfStrStrtab,
ElfStrShstrtab,
ElfStrRelPlt,
ElfStrPlt,
@ -163,6 +165,8 @@ doelf(void)
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");
}
elfstr[ElfStrShstrtab] = addstring(shstrtab, ".shstrtab");
@ -288,7 +292,7 @@ asmb(void)
{
int32 t;
int a, dynsym;
uint32 va, fo, w, startva;
uint32 va, fo, w, symo, startva, elfsymo, elfstro, elfsymsize;
int strtabsize;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
@ -301,6 +305,10 @@ asmb(void)
Bprint(&bso, "%5.2f asmb\n", cputime());
Bflush(&bso);
elfsymsize = 0;
elfstro = 0;
elfsymo = 0;
sect = segtext.sect;
seek(cout, sect->vaddr - segtext.vaddr + segtext.fileoff, 0);
codeblk(sect->vaddr, sect->len);
@ -322,15 +330,30 @@ asmb(void)
seek(cout, sect->vaddr - segtext.vaddr + segtext.fileoff, 0);
datblk(sect->vaddr, sect->len);
if(iself) {
/* index of elf text section; needed by asmelfsym, double-checked below */
/* !debug['d'] causes extra sections before the .text section */
elftextsh = 1;
if(!debug['d']) {
elftextsh += 10;
if(elfverneed)
elftextsh += 2;
}
}
/* output symbol table */
symsize = 0;
lcsize = 0;
symo = 0;
if(!debug['s']) {
// TODO: rationalize
if(debug['v'])
Bprint(&bso, "%5.2f sym\n", cputime());
Bflush(&bso);
switch(HEADTYPE) {
default:
if(iself)
goto ElfSym;
case Hnoheader:
case Hrisc:
case Hixp1200:
@ -345,14 +368,29 @@ asmb(void)
OFFSET += rnd(segdata.filelen, 4096);
seek(cout, OFFSET, 0);
break;
case Hlinux:
OFFSET += segdata.filelen;
seek(cout, rnd(OFFSET, INITRND), 0);
ElfSym:
symo = rnd(HEADR+segtext.filelen, INITRND)+segdata.filelen;
symo = rnd(symo, INITRND);
break;
}
if(!debug['s'])
asmthumbmap();
if(iself) {
if(debug['v'])
Bprint(&bso, "%5.2f elfsym\n", cputime());
elfsymo = symo+8+symsize+lcsize;
seek(cout, elfsymo, 0);
asmelfsym32();
cflush();
elfstro = seek(cout, 0, 1);
elfsymsize = elfstro - elfsymo;
ewrite(cout, elfstrdat, elfstrsize);
// if(debug['v'])
// Bprint(&bso, "%5.2f dwarf\n", cputime());
// dwarfemitdebugsections();
}
asmthumbmap();
cflush();
}
cursym = nil;
@ -541,6 +579,8 @@ asmb(void)
ph->flags = PF_W+PF_R;
ph->align = 4;
if(elftextsh != eh->shnum)
diag("elftextsh = %d, want %d", elftextsh, eh->shnum);
for(sect=segtext.sect; sect!=nil; sect=sect->next)
elfshbits(sect);
for(sect=segdata.sect; sect!=nil; sect=sect->next)
@ -558,6 +598,22 @@ asmb(void)
sh->flags = SHF_ALLOC;
sh->addralign = 1;
shsym(sh, lookup("pclntab", 0));
sh = newElfShdr(elfstr[ElfStrSymtab]);
sh->type = SHT_SYMTAB;
sh->off = elfsymo;
sh->size = elfsymsize;
sh->addralign = 4;
sh->entsize = 16;
sh->link = eh->shnum; // link to strtab
sh = newElfShdr(elfstr[ElfStrStrtab]);
sh->type = SHT_STRTAB;
sh->off = elfstro;
sh->size = elfstrsize;
sh->addralign = 1;
// dwarfaddelfheaders();
}
sh = newElfShstrtab(elfstr[ElfStrShstrtab]);

3
src/cmd/6l/l.h
View File

@ -350,9 +350,6 @@ EXTERN Sym* fromgotype; // type symbol on last p->from read
EXTERN vlong textstksiz;
EXTERN vlong textarg;
EXTERN int elfstrsize;
EXTERN char* elfstrdat;
EXTERN int elftextsh;
extern Optab optab[];
extern Optab* opindex[];

62
src/cmd/8l/asm.c
View File

@ -532,6 +532,8 @@ doelf(void)
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");
@ -658,7 +660,7 @@ asmb(void)
{
int32 v, magic;
int a, dynsym;
uint32 symo, startva, machlink;
uint32 symo, startva, machlink, elfsymo, elfstro, elfsymsize;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
ElfShdr *sh;
@ -670,6 +672,10 @@ asmb(void)
Bprint(&bso, "%5.2f asmb\n", cputime());
Bflush(&bso);
elfsymsize = 0;
elfstro = 0;
elfsymo = 0;
sect = segtext.sect;
seek(cout, sect->vaddr - segtext.vaddr + segtext.fileoff, 0);
codeblk(sect->vaddr, sect->len);
@ -741,27 +747,33 @@ asmb(void)
symo = rnd(symo, PEFILEALIGN);
break;
}
if(!debug['s']) {
if(HEADTYPE == Hplan9x32) {
seek(cout, symo, 0);
asmplan9sym();
cflush();
if(HEADTYPE == Hplan9x32) {
asmplan9sym();
sym = lookup("pclntab", 0);
if(sym != nil) {
lcsize = sym->np;
for(i=0; i < lcsize; i++)
cput(sym->p[i]);
cflush();
sym = lookup("pclntab", 0);
if(sym != nil) {
lcsize = sym->np;
for(i=0; i < lcsize; i++)
cput(sym->p[i]);
cflush();
}
} else if(HEADTYPE != Hwindows) {
if(debug['v'])
Bprint(&bso, "%5.2f dwarf\n", cputime());
dwarfemitdebugsections();
}
} else if(iself) {
if(debug['v'])
Bprint(&bso, "%5.2f elfsym\n", cputime());
elfsymo = symo+8+symsize+lcsize;
seek(cout, elfsymo, 0);
asmelfsym32();
cflush();
elfstro = seek(cout, 0, 1);
elfsymsize = elfstro - elfsymo;
ewrite(cout, elfstrdat, elfstrsize);
if(debug['v'])
Bprint(&bso, "%5.2f dwarf\n", cputime());
dwarfemitdebugsections();
}
}
if(debug['v'])
@ -1082,6 +1094,20 @@ asmb(void)
sh->addralign = 1;
shsym(sh, lookup("pclntab", 0));
sh = newElfShdr(elfstr[ElfStrSymtab]);
sh->type = SHT_SYMTAB;
sh->off = elfsymo;
sh->size = elfsymsize;
sh->addralign = 4;
sh->entsize = 16;
sh->link = eh->shnum; // link to strtab
sh = newElfShdr(elfstr[ElfStrStrtab]);
sh->type = SHT_STRTAB;
sh->off = elfstro;
sh->size = elfstrsize;
sh->addralign = 1;
dwarfaddelfheaders();
}

4
src/cmd/ld/elf.h
View File

@ -978,6 +978,10 @@ ElfShdr* elfshbits(Section*);
void elfsetstring(char*, int);
void elfaddverneed(Sym*);
EXTERN int elfstrsize;
EXTERN char* elfstrdat;
EXTERN int elftextsh;
/*
* Total amount of space to reserve at the start of the file
* for Header, PHeaders, SHeaders, and interp.

1
src/cmd/ld/lib.h
View File

@ -186,6 +186,7 @@ vlong addsize(Sym*, Sym*);
vlong adduint8(Sym*, uint8);
vlong adduint16(Sym*, uint16);
void asmsym(void);
void asmelfsym32(void);
void asmelfsym64(void);
void asmplan9sym(void);
void strnput(char*, int);