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cmd/ld: add -B option to set build ID

Browse Source 
Background on build ID:
http://fedoraproject.org/wiki/RolandMcGrath/BuildID

R=rsc
CC=golang-dev
https://golang.org/cl/6625072
This commit is contained in:
Ian Lance Taylor 2012-10-09 15:29:43 -07:00
parent dfc7304d32
commit 32316bba5b
9 changed files with 167 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
src/cmd/5l/asm.c
View File

@ -79,6 +79,7 @@ enum {
ElfStrGnuVersionR,
ElfStrNoteNetbsdIdent,
ElfStrNoteOpenbsdIdent,
ElfStrNoteBuildInfo,
ElfStrNoPtrData,
ElfStrNoPtrBss,
NElfStr
@ -523,6 +524,8 @@ doelf(void)
elfstr[ElfStrNoteNetbsdIdent] = addstring(shstrtab, ".note.netbsd.ident");
if(HEADTYPE == Hopenbsd)
elfstr[ElfStrNoteOpenbsdIdent] = addstring(shstrtab, ".note.openbsd.ident");
if(buildinfolen > 0)
elfstr[ElfStrNoteBuildInfo] = addstring(shstrtab, ".note.gnu.build-id");
addstring(shstrtab, ".rodata");
addstring(shstrtab, ".gcdata");
addstring(shstrtab, ".gcbss");
@ -669,7 +672,7 @@ asmb(void)
int a, dynsym;
uint32 fo, symo, startva, resoff;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
ElfPhdr *ph, *pph, *pnote;
ElfShdr *sh;
Section *sect;
int o;
@ -706,6 +709,8 @@ asmb(void)
}
if(HEADTYPE == Hnetbsd || HEADTYPE == Hopenbsd)
elftextsh += 1;
if(buildinfolen > 0)
elftextsh += 1;
}
/* output symbol table */
@ -876,6 +881,7 @@ asmb(void)
phsh(ph, sh);
}
pnote = nil;
if(HEADTYPE == Hnetbsd || HEADTYPE == Hopenbsd) {
sh = nil;
switch(HEADTYPE) {
@ -889,10 +895,22 @@ asmb(void)
break;
}
ph = newElfPhdr();
ph->type = PT_NOTE;
ph->flags = PF_R;
phsh(ph, sh);
pnote = newElfPhdr();
pnote->type = PT_NOTE;
pnote->flags = PF_R;
phsh(pnote, sh);
}
if(buildinfolen > 0) {
sh = newElfShdr(elfstr[ElfStrNoteBuildInfo]);
resoff -= elfbuildinfo(sh, startva, resoff);
if(pnote == nil) {
pnote = newElfPhdr();
pnote->type = PT_NOTE;
pnote->flags = PF_R;
}
phsh(pnote, sh);
}
elfphload(&segtext);
@ -1079,6 +1097,8 @@ asmb(void)
a += elfwritenetbsdsig(elfstr[ElfStrNoteNetbsdIdent]);
if(HEADTYPE == Hopenbsd)
a += elfwriteopenbsdsig(elfstr[ElfStrNoteOpenbsdIdent]);
if(buildinfolen > 0)
a += elfwritebuildinfo(elfstr[ElfStrNoteBuildInfo]);
if(a > ELFRESERVE)
diag("ELFRESERVE too small: %d > %d", a, ELFRESERVE);
break;

4
src/cmd/5l/obj.c
View File

@ -143,6 +143,10 @@ main(int argc, char *argv[])
val = EARGF(usage());
addstrdata(name, val);
break;
case 'B':
val = EARGF(usage());
addbuildinfo(val);
break;
} ARGEND
USED(argc);

30
src/cmd/6l/asm.c
View File

@ -96,6 +96,7 @@ enum {
ElfStrGnuVersionR,
ElfStrNoteNetbsdIdent,
ElfStrNoteOpenbsdIdent,
ElfStrNoteBuildInfo,
ElfStrNoPtrData,
ElfStrNoPtrBss,
NElfStr
@ -597,6 +598,8 @@ doelf(void)
elfstr[ElfStrNoteNetbsdIdent] = addstring(shstrtab, ".note.netbsd.ident");
if(HEADTYPE == Hopenbsd)
elfstr[ElfStrNoteOpenbsdIdent] = addstring(shstrtab, ".note.openbsd.ident");
if(buildinfolen > 0)
elfstr[ElfStrNoteBuildInfo] = addstring(shstrtab, ".note.gnu.build-id");
addstring(shstrtab, ".elfdata");
addstring(shstrtab, ".rodata");
addstring(shstrtab, ".gcdata");
@ -734,7 +737,7 @@ asmb(void)
int a, dynsym;
vlong vl, startva, symo, dwarfoff, machlink, resoff;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
ElfPhdr *ph, *pph, *pnote;
ElfShdr *sh;
Section *sect;
Sym *sym;
@ -807,6 +810,8 @@ asmb(void)
}
if(HEADTYPE == Hnetbsd || HEADTYPE == Hopenbsd)
elftextsh += 1;
if(buildinfolen > 0)
elftextsh += 1;
break;
case Hwindows:
break;
@ -976,6 +981,7 @@ asmb(void)
phsh(ph, sh);
}
pnote = nil;
if(HEADTYPE == Hnetbsd || HEADTYPE == Hopenbsd) {
sh = nil;
switch(HEADTYPE) {
@ -989,10 +995,22 @@ asmb(void)
break;
}
ph = newElfPhdr();
ph->type = PT_NOTE;
ph->flags = PF_R;
phsh(ph, sh);
pnote = newElfPhdr();
pnote->type = PT_NOTE;
pnote->flags = PF_R;
phsh(pnote, sh);
}
if(buildinfolen > 0) {
sh = newElfShdr(elfstr[ElfStrNoteBuildInfo]);
resoff -= elfbuildinfo(sh, startva, resoff);
if(pnote == nil) {
pnote = newElfPhdr();
pnote->type = PT_NOTE;
pnote->flags = PF_R;
}
phsh(pnote, sh);
}
elfphload(&segtext);
@ -1179,6 +1197,8 @@ asmb(void)
a += elfwritenetbsdsig(elfstr[ElfStrNoteNetbsdIdent]);
if(HEADTYPE == Hopenbsd)
a += elfwriteopenbsdsig(elfstr[ElfStrNoteOpenbsdIdent]);
if(buildinfolen > 0)
a += elfwritebuildinfo(elfstr[ElfStrNoteBuildInfo]);
if(a > ELFRESERVE)
diag("ELFRESERVE too small: %d > %d", a, ELFRESERVE);
break;

4
src/cmd/6l/obj.c
View File

@ -140,6 +140,10 @@ main(int argc, char *argv[])
val = EARGF(usage());
addstrdata(name, val);
break;
case 'B':
val = EARGF(usage());
addbuildinfo(val);
break;
} ARGEND
if(argc != 1)

30
src/cmd/8l/asm.c
View File

@ -92,6 +92,7 @@ enum {
ElfStrGnuVersionR,
ElfStrNoteNetbsdIdent,
ElfStrNoteOpenbsdIdent,
ElfStrNoteBuildInfo,
ElfStrNoPtrData,
ElfStrNoPtrBss,
NElfStr
@ -573,6 +574,8 @@ doelf(void)
elfstr[ElfStrNoteNetbsdIdent] = addstring(shstrtab, ".note.netbsd.ident");
if(HEADTYPE == Hopenbsd)
elfstr[ElfStrNoteOpenbsdIdent] = addstring(shstrtab, ".note.openbsd.ident");
if(buildinfolen > 0)
elfstr[ElfStrNoteBuildInfo] = addstring(shstrtab, ".note.gnu.build-id");
addstring(shstrtab, ".elfdata");
addstring(shstrtab, ".rodata");
addstring(shstrtab, ".gcdata");
@ -710,7 +713,7 @@ asmb(void)
int a, dynsym;
uint32 symo, startva, dwarfoff, machlink, resoff;
ElfEhdr *eh;
ElfPhdr *ph, *pph;
ElfPhdr *ph, *pph, *pnote;
ElfShdr *sh;
Section *sect;
Sym *sym;
@ -764,6 +767,8 @@ asmb(void)
}
if(HEADTYPE == Hnetbsd || HEADTYPE == Hopenbsd)
elftextsh += 1;
if(buildinfolen > 0)
elftextsh += 1;
}
symsize = 0;
@ -1036,6 +1041,7 @@ asmb(void)
phsh(ph, sh);
}
pnote = nil;
if(HEADTYPE == Hnetbsd || HEADTYPE == Hopenbsd) {
sh = nil;
switch(HEADTYPE) {
@ -1049,10 +1055,22 @@ asmb(void)
break;
}
ph = newElfPhdr();
ph->type = PT_NOTE;
ph->flags = PF_R;
phsh(ph, sh);
pnote = newElfPhdr();
pnote->type = PT_NOTE;
pnote->flags = PF_R;
phsh(pnote, sh);
}
if(buildinfolen > 0) {
sh = newElfShdr(elfstr[ElfStrNoteBuildInfo]);
resoff -= elfbuildinfo(sh, startva, resoff);
if(pnote == nil) {
pnote = newElfPhdr();
pnote->type = PT_NOTE;
pnote->flags = PF_R;
}
phsh(pnote, sh);
}
// Additions to the reserved area must be above this line.
@ -1249,6 +1267,8 @@ asmb(void)
a += elfwritenetbsdsig(elfstr[ElfStrNoteNetbsdIdent]);
if(HEADTYPE == Hopenbsd)
a += elfwriteopenbsdsig(elfstr[ElfStrNoteOpenbsdIdent]);
if(buildinfolen > 0)
a += elfwritebuildinfo(elfstr[ElfStrNoteBuildInfo]);
if(a > ELFRESERVE)
diag("ELFRESERVE too small: %d > %d", a, ELFRESERVE);
break;

4
src/cmd/8l/obj.c
View File

@ -145,6 +145,10 @@ main(int argc, char *argv[])
val = EARGF(usage());
addstrdata(name, val);
break;
case 'B':
val = EARGF(usage());
addbuildinfo(val);
break;
} ARGEND
if(argc != 1)

3
src/cmd/ld/doc.go
View File

@ -58,5 +58,8 @@ Options new in this version:
as displayed in the symbol table printed by "go tool nm".
-b
Link with race detection libraries.
-B value
Add a NT_GNU_BUILD_ID note when using ELF. The value
should start with 0x and be an even number of hex digits.
*/
package documentation

73
src/cmd/ld/elf.c
View File

@ -31,6 +31,8 @@ struct Elfstring
static Elfstring elfstr[100];
static int nelfstr;
static char buildinfo[32];
/*
Initialize the global variable that describes the ELF header. It will be updated as
we write section and prog headers.
@ -455,6 +457,77 @@ elfwriteopenbsdsig(vlong stridx)
return sh->size;
}
void
addbuildinfo(char *val)
{
char *ov;
int i, b, j;
if(val[0] != '0' || val[1] != 'x') {
fprint(2, "%s: -B argument must start with 0x: %s\n", argv0, val);
exits("usage");
}
ov = val;
val += 2;
i = 0;
while(*val != '\0') {
if(val[1] == '\0') {
fprint(2, "%s: -B argument must have even number of digits: %s\n", argv0, ov);
exits("usage");
}
b = 0;
for(j = 0; j < 2; j++, val++) {
b *= 16;
if(*val >= '0' && *val <= '9')
b += *val - '0';
else if(*val >= 'a' && *val <= 'f')
b += *val - 'a' + 10;
else if(*val >= 'A' && *val <= 'F')
b += *val - 'A' + 10;
else {
fprint(2, "%s: -B argument contains invalid hex digit %c: %s\n", argv0, *val, ov);
exits("usage");
}
}
if(i >= nelem(buildinfo)) {
fprint(2, "%s: -B option too long (max %d digits): %s\n", argv0, (int)nelem(buildinfo), ov);
exits("usage");
}
buildinfo[i++] = b;
}
buildinfolen = i;
}
// Build info note
#define ELF_NOTE_BUILDINFO_NAMESZ 4
#define ELF_NOTE_BUILDINFO_TAG 3
#define ELF_NOTE_BUILDINFO_NAME "GNU\0"
int
elfbuildinfo(ElfShdr *sh, uint64 startva, uint64 resoff)
{
int n;
n = ELF_NOTE_BUILDINFO_NAMESZ + rnd(buildinfolen, 4);
return elfnote(sh, startva, resoff, n);
}
int
elfwritebuildinfo(vlong stridx)
{
ElfShdr *sh;
sh = elfwritenotehdr(stridx, ELF_NOTE_BUILDINFO_NAMESZ, buildinfolen, ELF_NOTE_BUILDINFO_TAG);
if(sh == nil)
return 0;
cwrite(ELF_NOTE_BUILDINFO_NAME, ELF_NOTE_BUILDINFO_NAMESZ);
cwrite(buildinfo, buildinfolen);
cwrite("\0\0\0", rnd(buildinfolen, 4) - buildinfolen);
return sh->size;
}
extern int nelfsym;
int elfverneed;

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

@ -979,6 +979,9 @@ int elfnetbsdsig(ElfShdr*, uint64, uint64);
int elfwritenetbsdsig(vlong);
int elfopenbsdsig(ElfShdr*, uint64, uint64);
int elfwriteopenbsdsig(vlong);
void addbuildinfo(char*);
int elfbuildinfo(ElfShdr*, uint64, uint64);
int elfwritebuildinfo(vlong);
void elfdynhash(void);
ElfPhdr* elfphload(Segment*);
ElfShdr* elfshbits(Section*);
@ -988,6 +991,7 @@ void elfaddverneed(Sym*);
EXTERN int elfstrsize;
EXTERN char* elfstrdat;
EXTERN int elftextsh;
EXTERN int buildinfolen;
/*
* Total amount of space to reserve at the start of the file