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5l/6l/8l: add support for netbsd signature note section

Browse Source 
R=m4dh4tt3r, jsing, rsc
CC=golang-dev
https://golang.org/cl/5493068
This commit is contained in:
Joel Sing 2011-12-20 12:25:06 +11:00
parent b7e9d22528
commit 5842f7e46a
5 changed files with 146 additions and 36 deletions
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33
src/cmd/5l/asm.c
View File

@ -73,6 +73,7 @@ enum {
ElfStrShstrtab,
ElfStrRelPlt,
ElfStrPlt,
ElfStrNoteNetbsdIdent,
NElfStr
};
@ -164,6 +165,8 @@ doelf(void)
elfstr[ElfStrText] = addstring(shstrtab, ".text");
elfstr[ElfStrData] = addstring(shstrtab, ".data");
elfstr[ElfStrBss] = addstring(shstrtab, ".bss");
if(HEADTYPE == Hnetbsd)
elfstr[ElfStrNoteNetbsdIdent] = addstring(shstrtab, ".note.netbsd.ident");
addstring(shstrtab, ".rodata");
addstring(shstrtab, ".gosymtab");
addstring(shstrtab, ".gopclntab");
@ -294,7 +297,7 @@ asmb(void)
{
int32 t;
int a, dynsym;
uint32 fo, symo, startva;
uint32 fo, symo, startva, resoff;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
ElfShdr *sh;
@ -336,6 +339,8 @@ asmb(void)
if(elfverneed)
elftextsh += 2;
}
if(HEADTYPE == Hnetbsd)
elftextsh += 1;
}
/* output symbol table */
@ -371,7 +376,7 @@ asmb(void)
cseek(symo);
if(iself) {
if(debug['v'])
Bprint(&bso, "%5.2f elfsym\n", cputime());
Bprint(&bso, "%5.2f elfsym\n", cputime());
asmelfsym();
cflush();
cwrite(elfstrdat, elfstrsize);
@ -455,6 +460,7 @@ asmb(void)
eh = getElfEhdr();
fo = HEADR;
startva = INITTEXT - fo; /* va of byte 0 of file */
resoff = ELFRESERVE;
/* This null SHdr must appear before all others */
newElfShdr(elfstr[ElfStrEmpty]);
@ -487,7 +493,7 @@ asmb(void)
sh->addralign = 1;
if(interpreter == nil)
interpreter = linuxdynld;
elfinterp(sh, startva, interpreter);
resoff -= elfinterp(sh, startva, resoff, interpreter);
ph = newElfPhdr();
ph->type = PT_INTERP;
@ -495,11 +501,24 @@ asmb(void)
phsh(ph, sh);
}
if(HEADTYPE == Hnetbsd) {
sh = newElfShdr(elfstr[ElfStrNoteNetbsdIdent]);
sh->type = SHT_NOTE;
sh->flags = SHF_ALLOC;
sh->addralign = 4;
resoff -= elfnetbsdsig(sh, startva, resoff);
ph = newElfPhdr();
ph->type = PT_NOTE;
ph->flags = PF_R;
phsh(ph, sh);
}
elfphload(&segtext);
elfphload(&segdata);
/* Dynamic linking sections */
if (!debug['d']) { /* -d suppresses dynamic loader format */
if(!debug['d']) { /* -d suppresses dynamic loader format */
/* S headers for dynamic linking */
sh = newElfShdr(elfstr[ElfStrGot]);
sh->type = SHT_PROGBITS;
@ -590,7 +609,7 @@ asmb(void)
for(sect=segdata.sect; sect!=nil; sect=sect->next)
elfshbits(sect);
if (!debug['s']) {
if(!debug['s']) {
sh = newElfShdr(elfstr[ElfStrSymtab]);
sh->type = SHT_SYMTAB;
sh->off = symo;
@ -632,7 +651,9 @@ asmb(void)
a += elfwritehdr();
a += elfwritephdrs();
a += elfwriteshdrs();
a += elfwriteinterp();
a += elfwriteinterp(elfstr[ElfStrInterp]);
if(HEADTYPE == Hnetbsd)
a += elfwritenetbsdsig(elfstr[ElfStrNoteNetbsdIdent]);
if(a > ELFRESERVE)
diag("ELFRESERVE too small: %d > %d", a, ELFRESERVE);
break;

28
src/cmd/6l/asm.c
View File

@ -707,7 +707,7 @@ asmb(void)
{
int32 magic;
int a, dynsym;
vlong vl, startva, symo, dwarfoff, machlink;
vlong vl, startva, symo, dwarfoff, machlink, resoff;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
ElfShdr *sh;
@ -778,6 +778,8 @@ asmb(void)
if(elfverneed)
elftextsh += 2;
}
if(HEADTYPE == Hnetbsd)
elftextsh += 1;
break;
case Hwindows:
break;
@ -879,6 +881,7 @@ asmb(void)
eh = getElfEhdr();
startva = INITTEXT - HEADR;
resoff = ELFRESERVE;
/* This null SHdr must appear before all others */
newElfShdr(elfstr[ElfStrEmpty]);
@ -925,7 +928,7 @@ asmb(void)
break;
}
}
elfinterp(sh, startva, interpreter);
resoff -= elfinterp(sh, startva, resoff, interpreter);
ph = newElfPhdr();
ph->type = PT_INTERP;
@ -933,11 +936,24 @@ asmb(void)
phsh(ph, sh);
}
if(HEADTYPE == Hnetbsd) {
sh = newElfShdr(elfstr[ElfStrNoteNetbsdIdent]);
sh->type = SHT_NOTE;
sh->flags = SHF_ALLOC;
sh->addralign = 4;
resoff -= elfnetbsdsig(sh, startva, resoff);
ph = newElfPhdr();
ph->type = PT_NOTE;
ph->flags = PF_R;
phsh(ph, sh);
}
elfphload(&segtext);
elfphload(&segdata);
/* Dynamic linking sections */
if (!debug['d']) { /* -d suppresses dynamic loader format */
if(!debug['d']) { /* -d suppresses dynamic loader format */
/* S headers for dynamic linking */
sh = newElfShdr(elfstr[ElfStrGot]);
sh->type = SHT_PROGBITS;
@ -1061,7 +1077,7 @@ asmb(void)
for(sect=segdata.sect; sect!=nil; sect=sect->next)
elfshbits(sect);
if (!debug['s']) {
if(!debug['s']) {
sh = newElfShdr(elfstr[ElfStrSymtab]);
sh->type = SHT_SYMTAB;
sh->off = symo;
@ -1107,7 +1123,9 @@ asmb(void)
a += elfwritehdr();
a += elfwritephdrs();
a += elfwriteshdrs();
a += elfwriteinterp();
a += elfwriteinterp(elfstr[ElfStrInterp]);
if(HEADTYPE == Hnetbsd)
a += elfwritenetbsdsig(elfstr[ElfStrNoteNetbsdIdent]);
if(a > ELFRESERVE)
diag("ELFRESERVE too small: %d > %d", a, ELFRESERVE);
break;

33
src/cmd/8l/asm.c
View File

@ -92,6 +92,7 @@ enum {
ElfStrPlt,
ElfStrGnuVersion,
ElfStrGnuVersionR,
ElfStrNoteNetbsdIdent,
NElfStr
};
@ -528,6 +529,8 @@ doelf(void)
elfstr[ElfStrText] = addstring(shstrtab, ".text");
elfstr[ElfStrData] = addstring(shstrtab, ".data");
elfstr[ElfStrBss] = addstring(shstrtab, ".bss");
if(HEADTYPE == Hnetbsd)
elfstr[ElfStrNoteNetbsdIdent] = addstring(shstrtab, ".note.netbsd.ident");
addstring(shstrtab, ".elfdata");
addstring(shstrtab, ".rodata");
addstring(shstrtab, ".gosymtab");
@ -661,7 +664,7 @@ asmb(void)
{
int32 v, magic;
int a, dynsym;
uint32 symo, startva, dwarfoff, machlink;
uint32 symo, startva, dwarfoff, machlink, resoff;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
ElfShdr *sh;
@ -715,6 +718,8 @@ asmb(void)
if(elfverneed)
elftextsh += 2;
}
if(HEADTYPE == Hnetbsd)
elftextsh += 1;
}
symsize = 0;
@ -761,7 +766,7 @@ asmb(void)
default:
if(iself) {
if(debug['v'])
Bprint(&bso, "%5.2f elfsym\n", cputime());
Bprint(&bso, "%5.2f elfsym\n", cputime());
asmelfsym();
cflush();
cwrite(elfstrdat, elfstrsize);
@ -932,6 +937,7 @@ asmb(void)
Elfput:
eh = getElfEhdr();
startva = INITTEXT - HEADR;
resoff = ELFRESERVE;
/* This null SHdr must appear before all others */
newElfShdr(elfstr[ElfStrEmpty]);
@ -978,7 +984,7 @@ asmb(void)
break;
}
}
elfinterp(sh, startva, interpreter);
resoff -= elfinterp(sh, startva, resoff, interpreter);
ph = newElfPhdr();
ph->type = PT_INTERP;
@ -986,11 +992,24 @@ asmb(void)
phsh(ph, sh);
}
if(HEADTYPE == Hnetbsd) {
sh = newElfShdr(elfstr[ElfStrNoteNetbsdIdent]);
sh->type = SHT_NOTE;
sh->flags = SHF_ALLOC;
sh->addralign = 4;
resoff -= elfnetbsdsig(sh, startva, resoff);
ph = newElfPhdr();
ph->type = PT_NOTE;
ph->flags = PF_R;
phsh(ph, sh);
}
elfphload(&segtext);
elfphload(&segdata);
/* Dynamic linking sections */
if (!debug['d']) { /* -d suppresses dynamic loader format */
if(!debug['d']) { /* -d suppresses dynamic loader format */
/* S headers for dynamic linking */
sh = newElfShdr(elfstr[ElfStrGot]);
sh->type = SHT_PROGBITS;
@ -1114,7 +1133,7 @@ asmb(void)
for(sect=segdata.sect; sect!=nil; sect=sect->next)
elfshbits(sect);
if (!debug['s']) {
if(!debug['s']) {
sh = newElfShdr(elfstr[ElfStrSymtab]);
sh->type = SHT_SYMTAB;
sh->off = symo;
@ -1167,7 +1186,9 @@ asmb(void)
a += elfwritehdr();
a += elfwritephdrs();
a += elfwriteshdrs();
a += elfwriteinterp();
a += elfwriteinterp(elfstr[ElfStrInterp]);
if(HEADTYPE == Hnetbsd)
a += elfwritenetbsdsig(elfstr[ElfStrNoteNetbsdIdent]);
if(a > ELFRESERVE)
diag("ELFRESERVE too small: %d > %d", a, ELFRESERVE);
break;

82
src/cmd/ld/elf.c
View File

@ -318,29 +318,77 @@ elfwritedynentsymsize(Sym *s, int tag, Sym *t)
}
int
elfwriteinterp(void)
{
int n;
if(interp == nil)
return 0;
n = strlen(interp)+1;
cseek(ELFRESERVE-n);
cwrite(interp, n);
return n;
}
void
elfinterp(ElfShdr *sh, uint64 startva, char *p)
elfinterp(ElfShdr *sh, uint64 startva, uint64 resoff, char *p)
{
int n;
interp = p;
n = strlen(interp)+1;
sh->addr = startva + ELFRESERVE - n;
sh->off = ELFRESERVE - n;
sh->addr = startva + resoff - n;
sh->off = resoff - n;
sh->size = n;
return n;
}
int
elfwriteinterp(vlong stridx)
{
ElfShdr *sh = nil;
int i;
for(i = 0; i < hdr.shnum; i++)
if(shdr[i]->name == stridx)
sh = shdr[i];
if(sh == nil || interp == nil)
return 0;
cseek(sh->off);
cwrite(interp, sh->size);
return sh->size;
}
// Defined in NetBSD's sys/exec_elf.h
#define ELF_NOTE_TYPE_NETBSD_TAG 1
#define ELF_NOTE_NETBSD_NAMESZ 7
#define ELF_NOTE_NETBSD_DESCSZ 4
#define ELF_NOTE_NETBSD_NAME "NetBSD\0\0"
#define ELF_NOTE_NETBSD_VERSION 599000000 /* NetBSD 5.99 */
int
elfnetbsdsig(ElfShdr *sh, uint64 startva, uint64 resoff)
{
int n;
n = sizeof(Elf_Note) + ELF_NOTE_NETBSD_NAMESZ + ELF_NOTE_NETBSD_DESCSZ + 1;
n += resoff % 4;
sh->addr = startva + resoff - n;
sh->off = resoff - n;
sh->size = n;
return n;
}
int
elfwritenetbsdsig(vlong stridx) {
ElfShdr *sh = nil;
int i;
for(i = 0; i < hdr.shnum; i++)
if(shdr[i]->name == stridx)
sh = shdr[i];
if(sh == nil)
return 0;
// Write Elf_Note header followed by NetBSD string.
cseek(sh->off);
LPUT(ELF_NOTE_NETBSD_NAMESZ);
LPUT(ELF_NOTE_NETBSD_DESCSZ);
LPUT(ELF_NOTE_TYPE_NETBSD_TAG);
cwrite(ELF_NOTE_NETBSD_NAME, 8);
LPUT(ELF_NOTE_NETBSD_VERSION);
return sh->size;
}
extern int nelfsym;

6
src/cmd/ld/elf.h
View File

@ -968,8 +968,10 @@ extern int numelfphdr;
extern int numelfshdr;
extern int iself;
extern int elfverneed;
int elfwriteinterp(void);
void elfinterp(ElfShdr*, uint64, char*);
int elfinterp(ElfShdr*, uint64, uint64, char*);
int elfwriteinterp(vlong);
int elfnetbsdsig(ElfShdr*, uint64, uint64);
int elfwritenetbsdsig(vlong);
void elfdynhash(void);
ElfPhdr* elfphload(Segment*);
ElfShdr* elfshbits(Section*);