func reloc() {
if Debug['v'] != 0 {
fmt.Fprintf(&Bso, "%5.2f reloc\n", obj.Cputime())
}
Bflush(&Bso)
for s := Ctxt.Textp; s != nil; s = s.Next {
relocsym(s)
}
for s := datap; s != nil; s = s.Next {
relocsym(s)
}
}
func dynreloc() {
// -d suppresses dynamic loader format, so we may as well not
// compute these sections or mark their symbols as reachable.
if Debug['d'] != 0 && HEADTYPE != obj.Hwindows {
return
}
if Debug['v'] != 0 {
fmt.Fprintf(&Bso, "%5.2f reloc\n", obj.Cputime())
}
Bflush(&Bso)
for s := Ctxt.Textp; s != nil; s = s.Next {
dynrelocsym(s)
}
for s := datap; s != nil; s = s.Next {
dynrelocsym(s)
}
if Iself {
elfdynhash()
}
}
/*
* add library to library list.
* srcref: src file referring to package
* objref: object file referring to package
* file: object file, e.g., /home/rsc/go/pkg/container/vector.a
* pkg: package import path, e.g. container/vector
*/
func addlibpath(ctxt *Link, srcref string, objref string, file string, pkg string, shlibnamefile string) {
for i := 0; i < len(ctxt.Library); i++ {
if pkg == ctxt.Library[i].Pkg {
return
}
}
if ctxt.Debugvlog > 1 && ctxt.Bso != nil {
fmt.Fprintf(ctxt.Bso, "%5.2f addlibpath: srcref: %s objref: %s file: %s pkg: %s shlibnamefile: %s\n", obj.Cputime(), srcref, objref, file, pkg, shlibnamefile)
}
ctxt.Library = append(ctxt.Library, Library{})
l := &ctxt.Library[len(ctxt.Library)-1]
l.Objref = objref
l.Srcref = srcref
l.File = file
l.Pkg = pkg
if shlibnamefile != "" {
shlibbytes, err := ioutil.ReadFile(shlibnamefile)
if err != nil {
Diag("cannot read %s: %v", shlibnamefile, err)
}
l.Shlib = strings.TrimSpace(string(shlibbytes))
}
}
func ldpe(f *Biobuf, pkg string, length int64, pn string) {
if Debug['v'] != 0 {
fmt.Fprintf(&Bso, "%5.2f ldpe %s\n", obj.Cputime(), pn)
}
var sect *PeSect
Ctxt.Version++
base := int32(Boffset(f))
peobj := new(PeObj)
peobj.f = f
peobj.base = uint32(base)
peobj.name = pn
// read header
var err error
var j int
var l uint32
var name string
var numaux int
var r []Reloc
var rp *Reloc
var rsect *PeSect
var s *LSym
var sym *PeSym
var symbuf [18]uint8
if err = binary.Read(f, binary.LittleEndian, &peobj.fh); err != nil {
goto bad
}
// load section list
peobj.sect = make([]PeSect, peobj.fh.NumberOfSections)
peobj.nsect = uint(peobj.fh.NumberOfSections)
for i := 0; i < int(peobj.fh.NumberOfSections); i++ {
if err = binary.Read(f, binary.LittleEndian, &peobj.sect[i].sh); err != nil {
goto bad
}
peobj.sect[i].size = uint64(peobj.sect[i].sh.SizeOfRawData)
peobj.sect[i].name = cstring(peobj.sect[i].sh.Name[:])
}
// TODO return error if found .cormeta
// load string table
Bseek(f, int64(base)+int64(peobj.fh.PointerToSymbolTable)+int64(len(symbuf))*int64(peobj.fh.NumberOfSymbols), 0)
if Bread(f, symbuf[:4]) != 4 {
goto bad
}
l = Le32(symbuf[:])
peobj.snames = make([]byte, l)
Bseek(f, int64(base)+int64(peobj.fh.PointerToSymbolTable)+int64(len(symbuf))*int64(peobj.fh.NumberOfSymbols), 0)
if Bread(f, peobj.snames) != len(peobj.snames) {
goto bad
}
// rewrite section names if they start with /
for i := 0; i < int(peobj.fh.NumberOfSections); i++ {
if peobj.sect[i].name == "" {
continue
}
if peobj.sect[i].name[0] != '/' {
continue
}
l = uint32(obj.Atoi(peobj.sect[i].name[1:]))
peobj.sect[i].name = cstring(peobj.snames[l:])
}
// read symbols
peobj.pesym = make([]PeSym, peobj.fh.NumberOfSymbols)
peobj.npesym = uint(peobj.fh.NumberOfSymbols)
Bseek(f, int64(base)+int64(peobj.fh.PointerToSymbolTable), 0)
for i := 0; uint32(i) < peobj.fh.NumberOfSymbols; i += numaux + 1 {
Bseek(f, int64(base)+int64(peobj.fh.PointerToSymbolTable)+int64(len(symbuf))*int64(i), 0)
if Bread(f, symbuf[:]) != len(symbuf) {
goto bad
}
if (symbuf[0] == 0) && (symbuf[1] == 0) && (symbuf[2] == 0) && (symbuf[3] == 0) {
l = Le32(symbuf[4:])
peobj.pesym[i].name = cstring(peobj.snames[l:]) // sym name length <= 8
} else {
peobj.pesym[i].name = cstring(symbuf[:8])
}
peobj.pesym[i].value = Le32(symbuf[8:])
peobj.pesym[i].sectnum = Le16(symbuf[12:])
peobj.pesym[i].sclass = symbuf[16]
peobj.pesym[i].aux = symbuf[17]
peobj.pesym[i].type_ = Le16(symbuf[14:])
numaux = int(peobj.pesym[i].aux)
if numaux < 0 {
numaux = 0
}
}
// create symbols for mapped sections
for i := 0; uint(i) < peobj.nsect; i++ {
sect = &peobj.sect[i]
if sect.sh.Characteristics&IMAGE_SCN_MEM_DISCARDABLE != 0 {
continue
}
if sect.sh.Characteristics&(IMAGE_SCN_CNT_CODE|IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0 {
// This has been seen for .idata sections, which we
// want to ignore. See issues 5106 and 5273.
continue
}
if pemap(peobj, sect) < 0 {
goto bad
}
name = fmt.Sprintf("%s(%s)", pkg, sect.name)
s = Linklookup(Ctxt, name, Ctxt.Version)
switch sect.sh.Characteristics & (IMAGE_SCN_CNT_UNINITIALIZED_DATA | IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE | IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE) {
case IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ: //.rdata
s.Type = obj.SRODATA
case IMAGE_SCN_CNT_UNINITIALIZED_DATA | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE: //.bss
s.Type = obj.SNOPTRBSS
case IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE: //.data
s.Type = obj.SNOPTRDATA
case IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ: //.text
s.Type = obj.STEXT
default:
err = fmt.Errorf("unexpected flags %#06x for PE section %s", sect.sh.Characteristics, sect.name)
goto bad
}
s.P = sect.base
s.P = s.P[:sect.size]
s.Size = int64(sect.size)
sect.sym = s
if sect.name == ".rsrc" {
setpersrc(sect.sym)
}
}
// load relocations
for i := 0; uint(i) < peobj.nsect; i++ {
rsect = &peobj.sect[i]
if rsect.sym == nil || rsect.sh.NumberOfRelocations == 0 {
continue
}
if rsect.sh.Characteristics&IMAGE_SCN_MEM_DISCARDABLE != 0 {
continue
}
if sect.sh.Characteristics&(IMAGE_SCN_CNT_CODE|IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0 {
// This has been seen for .idata sections, which we
// want to ignore. See issues 5106 and 5273.
continue
}
r = make([]Reloc, rsect.sh.NumberOfRelocations)
Bseek(f, int64(peobj.base)+int64(rsect.sh.PointerToRelocations), 0)
for j = 0; j < int(rsect.sh.NumberOfRelocations); j++ {
rp = &r[j]
if Bread(f, symbuf[:10]) != 10 {
goto bad
}
rva := Le32(symbuf[0:])
symindex := Le32(symbuf[4:])
type_ := Le16(symbuf[8:])
if err = readpesym(peobj, int(symindex), &sym); err != nil {
goto bad
}
if sym.sym == nil {
err = fmt.Errorf("reloc of invalid sym %s idx=%d type=%d", sym.name, symindex, sym.type_)
goto bad
}
rp.Sym = sym.sym
rp.Siz = 4
rp.Off = int32(rva)
switch type_ {
default:
Diag("%s: unknown relocation type %d;", pn, type_)
fallthrough
case IMAGE_REL_I386_REL32, IMAGE_REL_AMD64_REL32,
IMAGE_REL_AMD64_ADDR32, // R_X86_64_PC32
IMAGE_REL_AMD64_ADDR32NB:
rp.Type = obj.R_PCREL
rp.Add = int64(int32(Le32(rsect.base[rp.Off:])))
case IMAGE_REL_I386_DIR32NB, IMAGE_REL_I386_DIR32:
rp.Type = obj.R_ADDR
// load addend from image
rp.Add = int64(int32(Le32(rsect.base[rp.Off:])))
case IMAGE_REL_AMD64_ADDR64: // R_X86_64_64
rp.Siz = 8
rp.Type = obj.R_ADDR
// load addend from image
rp.Add = int64(Le64(rsect.base[rp.Off:]))
}
// ld -r could generate multiple section symbols for the
// same section but with different values, we have to take
// that into account
if issect(&peobj.pesym[symindex]) {
rp.Add += int64(peobj.pesym[symindex].value)
}
}
sort.Sort(rbyoff(r[:rsect.sh.NumberOfRelocations]))
s = rsect.sym
s.R = r
s.R = s.R[:rsect.sh.NumberOfRelocations]
}
// enter sub-symbols into symbol table.
for i := 0; uint(i) < peobj.npesym; i++ {
if peobj.pesym[i].name == "" {
continue
}
if issect(&peobj.pesym[i]) {
continue
}
if uint(peobj.pesym[i].sectnum) > peobj.nsect {
continue
}
if peobj.pesym[i].sectnum > 0 {
sect = &peobj.sect[peobj.pesym[i].sectnum-1]
if sect.sym == nil {
continue
}
}
if err = readpesym(peobj, i, &sym); err != nil {
goto bad
}
s = sym.sym
if sym.sectnum == 0 { // extern
if s.Type == obj.SDYNIMPORT {
s.Plt = -2 // flag for dynimport in PE object files.
}
if s.Type == obj.SXREF && sym.value > 0 { // global data
s.Type = obj.SNOPTRDATA
s.Size = int64(sym.value)
}
continue
} else if sym.sectnum > 0 && uint(sym.sectnum) <= peobj.nsect {
sect = &peobj.sect[sym.sectnum-1]
if sect.sym == nil {
Diag("%s: %s sym == 0!", pn, s.Name)
}
} else {
Diag("%s: %s sectnum < 0!", pn, s.Name)
}
if sect == nil {
return
}
if s.Outer != nil {
if s.Dupok != 0 {
continue
}
Exitf("%s: duplicate symbol reference: %s in both %s and %s", pn, s.Name, s.Outer.Name, sect.sym.Name)
}
s.Sub = sect.sym.Sub
sect.sym.Sub = s
s.Type = sect.sym.Type | obj.SSUB
s.Value = int64(sym.value)
s.Size = 4
s.Outer = sect.sym
if sect.sym.Type == obj.STEXT {
if s.External != 0 && s.Dupok == 0 {
Diag("%s: duplicate definition of %s", pn, s.Name)
}
s.External = 1
}
}
// Sort outer lists by address, adding to textp.
// This keeps textp in increasing address order.
for i := 0; uint(i) < peobj.nsect; i++ {
s = peobj.sect[i].sym
if s == nil {
continue
}
if s.Sub != nil {
s.Sub = listsort(s.Sub, valuecmp, listsubp)
}
if s.Type == obj.STEXT {
if s.Onlist != 0 {
log.Fatalf("symbol %s listed multiple times", s.Name)
}
s.Onlist = 1
if Ctxt.Etextp != nil {
Ctxt.Etextp.Next = s
} else {
Ctxt.Textp = s
}
Ctxt.Etextp = s
for s = s.Sub; s != nil; s = s.Sub {
if s.Onlist != 0 {
log.Fatalf("symbol %s listed multiple times", s.Name)
}
s.Onlist = 1
Ctxt.Etextp.Next = s
Ctxt.Etextp = s
}
}
}
return
bad:
Diag("%s: malformed pe file: %v", pn, err)
}
func deadcode() {
if Debug['v'] != 0 {
fmt.Fprintf(&Bso, "%5.2f deadcode\n", obj.Cputime())
}
if Buildmode == BuildmodeShared {
// Mark all symbols as reachable when building a
// shared library.
for s := Ctxt.Allsym; s != nil; s = s.Allsym {
if s.Type != 0 {
mark(s)
}
}
mark(Linkrlookup(Ctxt, "main.main", 0))
mark(Linkrlookup(Ctxt, "main.init", 0))
} else {
mark(Linklookup(Ctxt, INITENTRY, 0))
if Linkshared && Buildmode == BuildmodeExe {
mark(Linkrlookup(Ctxt, "main.main", 0))
mark(Linkrlookup(Ctxt, "main.init", 0))
}
for i := 0; i < len(markextra); i++ {
mark(Linklookup(Ctxt, markextra[i], 0))
}
for i := 0; i < len(dynexp); i++ {
mark(dynexp[i])
}
markflood()
// keep each beginning with 'typelink.' if the symbol it points at is being kept.
for s := Ctxt.Allsym; s != nil; s = s.Allsym {
if strings.HasPrefix(s.Name, "go.typelink.") {
s.Reachable = len(s.R) == 1 && s.R[0].Sym.Reachable
}
}
// remove dead text but keep file information (z symbols).
var last *LSym
for s := Ctxt.Textp; s != nil; s = s.Next {
if !s.Reachable {
continue
}
// NOTE: Removing s from old textp and adding to new, shorter textp.
if last == nil {
Ctxt.Textp = s
} else {
last.Next = s
}
last = s
}
if last == nil {
Ctxt.Textp = nil
Ctxt.Etextp = nil
} else {
last.Next = nil
Ctxt.Etextp = last
}
}
for s := Ctxt.Allsym; s != nil; s = s.Allsym {
if strings.HasPrefix(s.Name, "go.weak.") {
s.Special = 1 // do not lay out in data segment
s.Reachable = true
s.Hide = 1
}
}
// record field tracking references
var buf bytes.Buffer
var p *LSym
for s := Ctxt.Allsym; s != nil; s = s.Allsym {
if strings.HasPrefix(s.Name, "go.track.") {
s.Special = 1 // do not lay out in data segment
s.Hide = 1
if s.Reachable {
buf.WriteString(s.Name[9:])
for p = s.Reachparent; p != nil; p = p.Reachparent {
buf.WriteString("\t")
buf.WriteString(p.Name)
}
buf.WriteString("\n")
}
s.Type = obj.SCONST
s.Value = 0
}
}
if tracksym == "" {
return
}
s := Linklookup(Ctxt, tracksym, 0)
if !s.Reachable {
return
}
addstrdata(tracksym, buf.String())
}
func dodata() {
if Debug['v'] != 0 {
fmt.Fprintf(&Bso, "%5.2f dodata\n", obj.Cputime())
}
Bflush(&Bso)
var last *LSym
datap = nil
for s := Ctxt.Allsym; s != nil; s = s.Allsym {
if !s.Reachable || s.Special != 0 {
continue
}
if obj.STEXT < s.Type && s.Type < obj.SXREF {
if s.Onlist != 0 {
log.Fatalf("symbol %s listed multiple times", s.Name)
}
s.Onlist = 1
if last == nil {
datap = s
} else {
last.Next = s
}
s.Next = nil
last = s
}
}
for s := datap; s != nil; s = s.Next {
if int64(len(s.P)) > s.Size {
Diag("%s: initialize bounds (%d < %d)", s.Name, int64(s.Size), len(s.P))
}
}
/*
* now that we have the datap list, but before we start
* to assign addresses, record all the necessary
* dynamic relocations. these will grow the relocation
* symbol, which is itself data.
*
* on darwin, we need the symbol table numbers for dynreloc.
*/
if HEADTYPE == obj.Hdarwin {
machosymorder()
}
dynreloc()
/* some symbols may no longer belong in datap (Mach-O) */
var l **LSym
var s *LSym
for l = &datap; ; {
s = *l
if s == nil {
break
}
if s.Type <= obj.STEXT || obj.SXREF <= s.Type {
*l = s.Next
} else {
l = &s.Next
}
}
*l = nil
datap = listsort(datap, datcmp, listnextp)
/*
* allocate sections. list is sorted by type,
* so we can just walk it for each piece we want to emit.
* segdata is processed before segtext, because we need
* to see all symbols in the .data and .bss sections in order
* to generate garbage collection information.
*/
/* begin segdata */
/* skip symbols belonging to segtext */
s = datap
for ; s != nil && s.Type < obj.SELFSECT; s = s.Next {
}
/* writable ELF sections */
datsize := int64(0)
var sect *Section
for ; s != nil && s.Type < obj.SELFGOT; s = s.Next {
sect = addsection(&Segdata, s.Name, 06)
sect.Align = symalign(s)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
s.Sect = sect
s.Type = obj.SDATA
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
sect.Length = uint64(datsize) - sect.Vaddr
}
/* .got (and .toc on ppc64) */
if s.Type == obj.SELFGOT {
sect := addsection(&Segdata, ".got", 06)
sect.Align = maxalign(s, obj.SELFGOT)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
var toc *LSym
for ; s != nil && s.Type == obj.SELFGOT; s = s.Next {
datsize = aligndatsize(datsize, s)
s.Sect = sect
s.Type = obj.SDATA
s.Value = int64(uint64(datsize) - sect.Vaddr)
// Resolve .TOC. symbol for this object file (ppc64)
toc = Linkrlookup(Ctxt, ".TOC.", int(s.Version))
if toc != nil {
toc.Sect = sect
toc.Outer = s
toc.Sub = s.Sub
s.Sub = toc
toc.Value = 0x8000
}
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize) - sect.Vaddr
}
/* pointer-free data */
sect = addsection(&Segdata, ".noptrdata", 06)
sect.Align = maxalign(s, obj.SINITARR-1)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
Linklookup(Ctxt, "runtime.noptrdata", 0).Sect = sect
Linklookup(Ctxt, "runtime.enoptrdata", 0).Sect = sect
for ; s != nil && s.Type < obj.SINITARR; s = s.Next {
datsize = aligndatsize(datsize, s)
s.Sect = sect
s.Type = obj.SDATA
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize) - sect.Vaddr
hasinitarr := Linkshared
/* shared library initializer */
switch Buildmode {
case BuildmodeCArchive, BuildmodeCShared, BuildmodeShared:
hasinitarr = true
}
if hasinitarr {
sect := addsection(&Segdata, ".init_array", 06)
sect.Align = maxalign(s, obj.SINITARR)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
for ; s != nil && s.Type == obj.SINITARR; s = s.Next {
datsize = aligndatsize(datsize, s)
s.Sect = sect
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize) - sect.Vaddr
}
/* data */
sect = addsection(&Segdata, ".data", 06)
sect.Align = maxalign(s, obj.SBSS-1)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
Linklookup(Ctxt, "runtime.data", 0).Sect = sect
Linklookup(Ctxt, "runtime.edata", 0).Sect = sect
gcdata := Linklookup(Ctxt, "runtime.gcdata", 0)
var gen ProgGen
proggeninit(&gen, gcdata)
for ; s != nil && s.Type < obj.SBSS; s = s.Next {
if s.Type == obj.SINITARR {
Ctxt.Cursym = s
Diag("unexpected symbol type %d", s.Type)
}
s.Sect = sect
s.Type = obj.SDATA
datsize = aligndatsize(datsize, s)
s.Value = int64(uint64(datsize) - sect.Vaddr)
proggenaddsym(&gen, s) // gc
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize) - sect.Vaddr
proggenfini(&gen, int64(sect.Length)) // gc
/* bss */
sect = addsection(&Segdata, ".bss", 06)
sect.Align = maxalign(s, obj.SNOPTRBSS-1)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
Linklookup(Ctxt, "runtime.bss", 0).Sect = sect
Linklookup(Ctxt, "runtime.ebss", 0).Sect = sect
gcbss := Linklookup(Ctxt, "runtime.gcbss", 0)
proggeninit(&gen, gcbss)
for ; s != nil && s.Type < obj.SNOPTRBSS; s = s.Next {
s.Sect = sect
datsize = aligndatsize(datsize, s)
s.Value = int64(uint64(datsize) - sect.Vaddr)
proggenaddsym(&gen, s) // gc
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize) - sect.Vaddr
proggenfini(&gen, int64(sect.Length)) // gc
/* pointer-free bss */
sect = addsection(&Segdata, ".noptrbss", 06)
sect.Align = maxalign(s, obj.SNOPTRBSS)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
Linklookup(Ctxt, "runtime.noptrbss", 0).Sect = sect
Linklookup(Ctxt, "runtime.enoptrbss", 0).Sect = sect
for ; s != nil && s.Type == obj.SNOPTRBSS; s = s.Next {
datsize = aligndatsize(datsize, s)
s.Sect = sect
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize) - sect.Vaddr
Linklookup(Ctxt, "runtime.end", 0).Sect = sect
// 6g uses 4-byte relocation offsets, so the entire segment must fit in 32 bits.
if datsize != int64(uint32(datsize)) {
Diag("data or bss segment too large")
}
if Iself && Linkmode == LinkExternal && s != nil && s.Type == obj.STLSBSS && HEADTYPE != obj.Hopenbsd {
sect := addsection(&Segdata, ".tbss", 06)
sect.Align = int32(Thearch.Ptrsize)
sect.Vaddr = 0
datsize = 0
for ; s != nil && s.Type == obj.STLSBSS; s = s.Next {
datsize = aligndatsize(datsize, s)
s.Sect = sect
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize)
} else {
// Might be internal linking but still using cgo.
// In that case, the only possible STLSBSS symbol is runtime.tlsg.
// Give it offset 0, because it's the only thing here.
if s != nil && s.Type == obj.STLSBSS && s.Name == "runtime.tlsg" {
s.Value = 0
s = s.Next
}
}
if s != nil {
Ctxt.Cursym = nil
Diag("unexpected symbol type %d for %s", s.Type, s.Name)
}
/*
* We finished data, begin read-only data.
* Not all systems support a separate read-only non-executable data section.
* ELF systems do.
* OS X and Plan 9 do not.
* Windows PE may, but if so we have not implemented it.
* And if we're using external linking mode, the point is moot,
* since it's not our decision; that code expects the sections in
* segtext.
*/
var segro *Segment
if Iself && Linkmode == LinkInternal {
segro = &Segrodata
} else {
segro = &Segtext
}
s = datap
datsize = 0
/* read-only executable ELF, Mach-O sections */
for ; s != nil && s.Type < obj.STYPE; s = s.Next {
sect = addsection(&Segtext, s.Name, 04)
sect.Align = symalign(s)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
s.Sect = sect
s.Type = obj.SRODATA
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
sect.Length = uint64(datsize) - sect.Vaddr
}
/* read-only data */
sect = addsection(segro, ".rodata", 04)
sect.Align = maxalign(s, obj.STYPELINK-1)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = 0
Linklookup(Ctxt, "runtime.rodata", 0).Sect = sect
Linklookup(Ctxt, "runtime.erodata", 0).Sect = sect
for ; s != nil && s.Type < obj.STYPELINK; s = s.Next {
datsize = aligndatsize(datsize, s)
s.Sect = sect
s.Type = obj.SRODATA
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize) - sect.Vaddr
/* typelink */
sect = addsection(segro, ".typelink", 04)
sect.Align = maxalign(s, obj.STYPELINK)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
Linklookup(Ctxt, "runtime.typelink", 0).Sect = sect
Linklookup(Ctxt, "runtime.etypelink", 0).Sect = sect
for ; s != nil && s.Type == obj.STYPELINK; s = s.Next {
datsize = aligndatsize(datsize, s)
s.Sect = sect
s.Type = obj.SRODATA
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize) - sect.Vaddr
/* gosymtab */
sect = addsection(segro, ".gosymtab", 04)
sect.Align = maxalign(s, obj.SPCLNTAB-1)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
Linklookup(Ctxt, "runtime.symtab", 0).Sect = sect
Linklookup(Ctxt, "runtime.esymtab", 0).Sect = sect
for ; s != nil && s.Type < obj.SPCLNTAB; s = s.Next {
datsize = aligndatsize(datsize, s)
s.Sect = sect
s.Type = obj.SRODATA
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize) - sect.Vaddr
/* gopclntab */
sect = addsection(segro, ".gopclntab", 04)
sect.Align = maxalign(s, obj.SELFROSECT-1)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
Linklookup(Ctxt, "runtime.pclntab", 0).Sect = sect
Linklookup(Ctxt, "runtime.epclntab", 0).Sect = sect
for ; s != nil && s.Type < obj.SELFROSECT; s = s.Next {
datsize = aligndatsize(datsize, s)
s.Sect = sect
s.Type = obj.SRODATA
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
}
sect.Length = uint64(datsize) - sect.Vaddr
/* read-only ELF, Mach-O sections */
for ; s != nil && s.Type < obj.SELFSECT; s = s.Next {
sect = addsection(segro, s.Name, 04)
sect.Align = symalign(s)
datsize = Rnd(datsize, int64(sect.Align))
sect.Vaddr = uint64(datsize)
s.Sect = sect
s.Type = obj.SRODATA
s.Value = int64(uint64(datsize) - sect.Vaddr)
growdatsize(&datsize, s)
sect.Length = uint64(datsize) - sect.Vaddr
}
// 6g uses 4-byte relocation offsets, so the entire segment must fit in 32 bits.
if datsize != int64(uint32(datsize)) {
Diag("read-only data segment too large")
}
/* number the sections */
n := int32(1)
for sect := Segtext.Sect; sect != nil; sect = sect.Next {
sect.Extnum = int16(n)
n++
}
for sect := Segrodata.Sect; sect != nil; sect = sect.Next {
sect.Extnum = int16(n)
n++
}
for sect := Segdata.Sect; sect != nil; sect = sect.Next {
sect.Extnum = int16(n)
n++
}
}
func pclntab() {
funcdata_bytes := int64(0)
ftab := Linklookup(Ctxt, "runtime.pclntab", 0)
ftab.Type = obj.SPCLNTAB
ftab.Reachable = true
// See golang.org/s/go12symtab for the format. Briefly:
// 8-byte header
// nfunc [thearch.ptrsize bytes]
// function table, alternating PC and offset to func struct [each entry thearch.ptrsize bytes]
// end PC [thearch.ptrsize bytes]
// offset to file table [4 bytes]
nfunc := int32(0)
for Ctxt.Cursym = Ctxt.Textp; Ctxt.Cursym != nil; Ctxt.Cursym = Ctxt.Cursym.Next {
if container(Ctxt.Cursym) == 0 {
nfunc++
}
}
pclntabNfunc = nfunc
Symgrow(Ctxt, ftab, 8+int64(Thearch.Ptrsize)+int64(nfunc)*2*int64(Thearch.Ptrsize)+int64(Thearch.Ptrsize)+4)
setuint32(Ctxt, ftab, 0, 0xfffffffb)
setuint8(Ctxt, ftab, 6, uint8(Thearch.Minlc))
setuint8(Ctxt, ftab, 7, uint8(Thearch.Ptrsize))
setuintxx(Ctxt, ftab, 8, uint64(nfunc), int64(Thearch.Ptrsize))
pclntabPclntabOffset = int32(8 + Thearch.Ptrsize)
nfunc = 0
var last *LSym
var end int32
var funcstart int32
var i int32
var it Pciter
var off int32
var pcln *Pcln
for Ctxt.Cursym = Ctxt.Textp; Ctxt.Cursym != nil; Ctxt.Cursym = Ctxt.Cursym.Next {
last = Ctxt.Cursym
if container(Ctxt.Cursym) != 0 {
continue
}
pcln = Ctxt.Cursym.Pcln
if pcln == nil {
pcln = &pclntab_zpcln
}
if pclntabFirstFunc == nil {
pclntabFirstFunc = Ctxt.Cursym
}
funcstart = int32(len(ftab.P))
funcstart += int32(-len(ftab.P)) & (int32(Thearch.Ptrsize) - 1)
setaddr(Ctxt, ftab, 8+int64(Thearch.Ptrsize)+int64(nfunc)*2*int64(Thearch.Ptrsize), Ctxt.Cursym)
setuintxx(Ctxt, ftab, 8+int64(Thearch.Ptrsize)+int64(nfunc)*2*int64(Thearch.Ptrsize)+int64(Thearch.Ptrsize), uint64(funcstart), int64(Thearch.Ptrsize))
// fixed size of struct, checked below
off = funcstart
end = funcstart + int32(Thearch.Ptrsize) + 3*4 + 5*4 + int32(pcln.Npcdata)*4 + int32(pcln.Nfuncdata)*int32(Thearch.Ptrsize)
if pcln.Nfuncdata > 0 && (end&int32(Thearch.Ptrsize-1) != 0) {
end += 4
}
Symgrow(Ctxt, ftab, int64(end))
// entry uintptr
off = int32(setaddr(Ctxt, ftab, int64(off), Ctxt.Cursym))
// name int32
off = int32(setuint32(Ctxt, ftab, int64(off), uint32(ftabaddstring(ftab, Ctxt.Cursym.Name))))
// args int32
// TODO: Move into funcinfo.
off = int32(setuint32(Ctxt, ftab, int64(off), uint32(Ctxt.Cursym.Args)))
// frame int32
// This has been removed (it was never set quite correctly anyway).
// Nothing should use it.
// Leave an obviously incorrect value.
// TODO: Remove entirely.
off = int32(setuint32(Ctxt, ftab, int64(off), 0x1234567))
if pcln != &pclntab_zpcln {
renumberfiles(Ctxt, pcln.File, &pcln.Pcfile)
if false {
// Sanity check the new numbering
for pciterinit(Ctxt, &it, &pcln.Pcfile); it.done == 0; pciternext(&it) {
if it.value < 1 || it.value > Ctxt.Nhistfile {
Diag("bad file number in pcfile: %d not in range [1, %d]\n", it.value, Ctxt.Nhistfile)
errorexit()
}
}
}
}
// pcdata
off = addpctab(ftab, off, &pcln.Pcsp)
off = addpctab(ftab, off, &pcln.Pcfile)
off = addpctab(ftab, off, &pcln.Pcline)
off = int32(setuint32(Ctxt, ftab, int64(off), uint32(pcln.Npcdata)))
off = int32(setuint32(Ctxt, ftab, int64(off), uint32(pcln.Nfuncdata)))
for i = 0; i < int32(pcln.Npcdata); i++ {
off = addpctab(ftab, off, &pcln.Pcdata[i])
}
// funcdata, must be pointer-aligned and we're only int32-aligned.
// Missing funcdata will be 0 (nil pointer).
if pcln.Nfuncdata > 0 {
if off&int32(Thearch.Ptrsize-1) != 0 {
off += 4
}
for i = 0; i < int32(pcln.Nfuncdata); i++ {
if pcln.Funcdata[i] == nil {
setuintxx(Ctxt, ftab, int64(off)+int64(Thearch.Ptrsize)*int64(i), uint64(pcln.Funcdataoff[i]), int64(Thearch.Ptrsize))
} else {
// TODO: Dedup.
funcdata_bytes += pcln.Funcdata[i].Size
setaddrplus(Ctxt, ftab, int64(off)+int64(Thearch.Ptrsize)*int64(i), pcln.Funcdata[i], pcln.Funcdataoff[i])
}
}
off += int32(pcln.Nfuncdata) * int32(Thearch.Ptrsize)
}
if off != end {
Diag("bad math in functab: funcstart=%d off=%d but end=%d (npcdata=%d nfuncdata=%d ptrsize=%d)", funcstart, off, end, pcln.Npcdata, pcln.Nfuncdata, Thearch.Ptrsize)
errorexit()
}
nfunc++
}
pclntabLastFunc = last
// Final entry of table is just end pc.
setaddrplus(Ctxt, ftab, 8+int64(Thearch.Ptrsize)+int64(nfunc)*2*int64(Thearch.Ptrsize), last, last.Size)
// Start file table.
start := int32(len(ftab.P))
start += int32(-len(ftab.P)) & (int32(Thearch.Ptrsize) - 1)
pclntabFiletabOffset = start
setuint32(Ctxt, ftab, 8+int64(Thearch.Ptrsize)+int64(nfunc)*2*int64(Thearch.Ptrsize)+int64(Thearch.Ptrsize), uint32(start))
Symgrow(Ctxt, ftab, int64(start)+(int64(Ctxt.Nhistfile)+1)*4)
setuint32(Ctxt, ftab, int64(start), uint32(Ctxt.Nhistfile))
for s := Ctxt.Filesyms; s != nil; s = s.Next {
setuint32(Ctxt, ftab, int64(start)+s.Value*4, uint32(ftabaddstring(ftab, s.Name)))
}
ftab.Size = int64(len(ftab.P))
if Debug['v'] != 0 {
fmt.Fprintf(&Bso, "%5.2f pclntab=%d bytes, funcdata total %d bytes\n", obj.Cputime(), int64(ftab.Size), int64(funcdata_bytes))
}
}
func Ldmain() {
Ctxt = linknew(Thelinkarch)
Ctxt.Thechar = int32(Thearch.Thechar)
Ctxt.Thestring = Thestring
Ctxt.Diag = Diag
Ctxt.Bso = &Bso
Bso = *Binitw(os.Stdout)
Debug = [128]int{}
nerrors = 0
outfile = ""
HEADTYPE = -1
INITTEXT = -1
INITDAT = -1
INITRND = -1
INITENTRY = ""
Linkmode = LinkAuto
// For testing behavior of go command when tools crash.
// Undocumented, not in standard flag parser to avoid
// exposing in usage message.
for _, arg := range os.Args {
if arg == "-crash_for_testing" {
*(*int)(nil) = 0
}
}
if Thearch.Thechar == '5' && Ctxt.Goarm == 5 {
Debug['F'] = 1
}
obj.Flagcount("1", "use alternate profiling code", &Debug['1'])
if Thearch.Thechar == '6' {
obj.Flagcount("8", "assume 64-bit addresses", &Debug['8'])
}
obj.Flagfn1("B", "info: define ELF NT_GNU_BUILD_ID note", addbuildinfo)
obj.Flagcount("C", "check Go calls to C code", &Debug['C'])
obj.Flagint64("D", "addr: data address", &INITDAT)
obj.Flagstr("E", "sym: entry symbol", &INITENTRY)
if Thearch.Thechar == '5' {
obj.Flagcount("G", "debug pseudo-ops", &Debug['G'])
}
obj.Flagfn1("I", "interp: set ELF interp", setinterp)
obj.Flagfn1("L", "dir: add dir to library path", Lflag)
obj.Flagfn1("H", "head: header type", setheadtype)
obj.Flagcount("K", "add stack underflow checks", &Debug['K'])
if Thearch.Thechar == '5' {
obj.Flagcount("M", "disable software div/mod", &Debug['M'])
}
obj.Flagcount("O", "print pc-line tables", &Debug['O'])
obj.Flagcount("Q", "debug byte-register code gen", &Debug['Q'])
if Thearch.Thechar == '5' {
obj.Flagcount("P", "debug code generation", &Debug['P'])
}
obj.Flagint32("R", "rnd: address rounding", &INITRND)
obj.Flagcount("nil", "check type signatures", &Debug['S'])
obj.Flagint64("T", "addr: text address", &INITTEXT)
obj.Flagfn0("V", "print version and exit", doversion)
obj.Flagcount("W", "disassemble input", &Debug['W'])
obj.Flagfn1("X", "name value: define string data", addstrdata1)
obj.Flagcount("Z", "clear stack frame on entry", &Debug['Z'])
obj.Flagcount("a", "disassemble output", &Debug['a'])
flag.Var(&Buildmode, "buildmode", "build mode to use")
obj.Flagcount("c", "dump call graph", &Debug['c'])
obj.Flagcount("d", "disable dynamic executable", &Debug['d'])
obj.Flagstr("extld", "ld: linker to run in external mode", &extld)
obj.Flagstr("extldflags", "ldflags: flags for external linker", &extldflags)
obj.Flagcount("f", "ignore version mismatch", &Debug['f'])
obj.Flagcount("g", "disable go package data checks", &Debug['g'])
obj.Flagstr("installsuffix", "suffix: pkg directory suffix", &flag_installsuffix)
obj.Flagstr("k", "sym: set field tracking symbol", &tracksym)
obj.Flagfn1("linkmode", "mode: set link mode (internal, external, auto)", setlinkmode)
flag.BoolVar(&Linkshared, "linkshared", false, "link against installed Go shared libraries")
obj.Flagcount("n", "dump symbol table", &Debug['n'])
obj.Flagstr("o", "outfile: set output file", &outfile)
flag.Var(&rpath, "r", "dir1:dir2:...: set ELF dynamic linker search path")
obj.Flagcount("race", "enable race detector", &flag_race)
obj.Flagcount("s", "disable symbol table", &Debug['s'])
var flagShared int
if Thearch.Thechar == '5' || Thearch.Thechar == '6' {
obj.Flagcount("shared", "generate shared object (implies -linkmode external)", &flagShared)
}
obj.Flagstr("tmpdir", "dir: leave temporary files in this directory", &tmpdir)
obj.Flagcount("u", "reject unsafe packages", &Debug['u'])
obj.Flagcount("v", "print link trace", &Debug['v'])
obj.Flagcount("w", "disable DWARF generation", &Debug['w'])
// Clumsy hack to preserve old behavior of -X taking two arguments.
for i := 0; i < len(os.Args); i++ {
arg := os.Args[i]
if (arg == "--X" || arg == "-X") && i+2 < len(os.Args) {
os.Args[i+2] = "-X=VALUE:" + os.Args[i+2]
i += 2
} else if (strings.HasPrefix(arg, "--X=") || strings.HasPrefix(arg, "-X=")) && i+1 < len(os.Args) {
os.Args[i+1] = "-X=VALUE:" + os.Args[i+1]
i++
}
}
obj.Flagstr("cpuprofile", "file: write cpu profile to file", &cpuprofile)
obj.Flagstr("memprofile", "file: write memory profile to file", &memprofile)
obj.Flagint64("memprofilerate", "set runtime.MemProfileRate", &memprofilerate)
obj.Flagparse(usage)
startProfile()
Ctxt.Bso = &Bso
Ctxt.Debugvlog = int32(Debug['v'])
if flagShared != 0 {
if Buildmode == BuildmodeExe {
Buildmode = BuildmodeCShared
} else if Buildmode != BuildmodeCShared {
Exitf("-shared and -buildmode=%s are incompatible", Buildmode.String())
}
}
if Buildmode != BuildmodeShared && flag.NArg() != 1 {
usage()
}
if outfile == "" {
if HEADTYPE == obj.Hwindows {
outfile = fmt.Sprintf("%c.out.exe", Thearch.Thechar)
} else {
outfile = fmt.Sprintf("%c.out", Thearch.Thechar)
}
}
libinit() // creates outfile
if HEADTYPE == -1 {
HEADTYPE = int32(headtype(goos))
}
Ctxt.Headtype = int(HEADTYPE)
if headstring == "" {
headstring = Headstr(int(HEADTYPE))
}
Thearch.Archinit()
if Linkshared && !Iself {
Exitf("-linkshared can only be used on elf systems")
}
if Debug['v'] != 0 {
fmt.Fprintf(&Bso, "HEADER = -H%d -T0x%x -D0x%x -R0x%x\n", HEADTYPE, uint64(INITTEXT), uint64(INITDAT), uint32(INITRND))
}
Bflush(&Bso)
if Buildmode == BuildmodeShared {
for i := 0; i < flag.NArg(); i++ {
arg := flag.Arg(i)
parts := strings.SplitN(arg, "=", 2)
var pkgpath, file string
if len(parts) == 1 {
pkgpath, file = "main", arg
} else {
pkgpath, file = parts[0], parts[1]
}
addlibpath(Ctxt, "command line", "command line", file, pkgpath, "")
}
} else {
addlibpath(Ctxt, "command line", "command line", flag.Arg(0), "main", "")
}
loadlib()
if Thearch.Thechar == '5' {
// mark some functions that are only referenced after linker code editing
if Debug['F'] != 0 {
mark(Linkrlookup(Ctxt, "_sfloat", 0))
}
mark(Linklookup(Ctxt, "runtime.read_tls_fallback", 0))
}
checkgo()
deadcode()
callgraph()
doelf()
if HEADTYPE == obj.Hdarwin {
domacho()
}
dostkcheck()
if HEADTYPE == obj.Hwindows {
dope()
}
addexport()
Thearch.Gentext() // trampolines, call stubs, etc.
textaddress()
pclntab()
findfunctab()
symtab()
dodata()
address()
doweak()
reloc()
Thearch.Asmb()
undef()
hostlink()
archive()
if Debug['v'] != 0 {
fmt.Fprintf(&Bso, "%5.2f cpu time\n", obj.Cputime())
fmt.Fprintf(&Bso, "%d symbols\n", Ctxt.Nsymbol)
fmt.Fprintf(&Bso, "%d liveness data\n", liveness)
}
Bflush(&Bso)
errorexit()
}
func objfile(file string, pkg string) {
pkg = pathtoprefix(pkg)
if Debug['v'] > 1 {
fmt.Fprintf(&Bso, "%5.2f ldobj: %s (%s)\n", obj.Cputime(), file, pkg)
}
Bflush(&Bso)
var err error
var f *Biobuf
f, err = Bopenr(file)
if err != nil {
Exitf("cannot open file %s: %v", file, err)
}
magbuf := make([]byte, len(ARMAG))
if Bread(f, magbuf) != len(magbuf) || !strings.HasPrefix(string(magbuf), ARMAG) {
/* load it as a regular file */
l := Bseek(f, 0, 2)
Bseek(f, 0, 0)
ldobj(f, pkg, l, file, file, FileObj)
Bterm(f)
return
}
/* skip over optional __.GOSYMDEF and process __.PKGDEF */
off := Boffset(f)
var arhdr ArHdr
l := nextar(f, off, &arhdr)
var pname string
if l <= 0 {
Diag("%s: short read on archive file symbol header", file)
goto out
}
if strings.HasPrefix(arhdr.name, symname) {
off += l
l = nextar(f, off, &arhdr)
if l <= 0 {
Diag("%s: short read on archive file symbol header", file)
goto out
}
}
if !strings.HasPrefix(arhdr.name, pkgname) {
Diag("%s: cannot find package header", file)
goto out
}
off += l
if Debug['u'] != 0 {
ldpkg(f, pkg, atolwhex(arhdr.size), file, Pkgdef)
}
/*
* load all the object files from the archive now.
* this gives us sequential file access and keeps us
* from needing to come back later to pick up more
* objects. it breaks the usual C archive model, but
* this is Go, not C. the common case in Go is that
* we need to load all the objects, and then we throw away
* the individual symbols that are unused.
*
* loading every object will also make it possible to
* load foreign objects not referenced by __.GOSYMDEF.
*/
for {
l = nextar(f, off, &arhdr)
if l == 0 {
break
}
if l < 0 {
Exitf("%s: malformed archive", file)
}
off += l
pname = fmt.Sprintf("%s(%s)", file, arhdr.name)
l = atolwhex(arhdr.size)
ldobj(f, pkg, l, pname, file, ArchiveObj)
}
out:
Bterm(f)
}
func loadlib() {
switch Buildmode {
case BuildmodeCShared:
s := Linklookup(Ctxt, "runtime.islibrary", 0)
s.Dupok = 1
Adduint8(Ctxt, s, 1)
case BuildmodeCArchive:
s := Linklookup(Ctxt, "runtime.isarchive", 0)
s.Dupok = 1
Adduint8(Ctxt, s, 1)
}
loadinternal("runtime")
if Thearch.Thechar == '5' {
loadinternal("math")
}
if flag_race != 0 {
loadinternal("runtime/race")
}
var i int
for i = 0; i < len(Ctxt.Library); i++ {
if Debug['v'] > 1 {
fmt.Fprintf(&Bso, "%5.2f autolib: %s (from %s)\n", obj.Cputime(), Ctxt.Library[i].File, Ctxt.Library[i].Objref)
}
iscgo = iscgo || Ctxt.Library[i].Pkg == "runtime/cgo"
if Ctxt.Library[i].Shlib != "" {
ldshlibsyms(Ctxt.Library[i].Shlib)
} else {
objfile(Ctxt.Library[i].File, Ctxt.Library[i].Pkg)
}
}
if Linkmode == LinkAuto {
if iscgo && externalobj {
Linkmode = LinkExternal
} else {
Linkmode = LinkInternal
}
// Force external linking for android.
if goos == "android" {
Linkmode = LinkExternal
}
// cgo on Darwin must use external linking
// we can always use external linking, but then there will be circular
// dependency problems when compiling natively (external linking requires
// runtime/cgo, runtime/cgo requires cmd/cgo, but cmd/cgo needs to be
// compiled using external linking.)
if (Thearch.Thechar == '5' || Thearch.Thechar == '7') && HEADTYPE == obj.Hdarwin && iscgo {
Linkmode = LinkExternal
}
}
// cmd/7l doesn't support cgo internal linking
// This is https://golang.org/issue/10373.
if iscgo && goarch == "arm64" {
Linkmode = LinkExternal
}
if Linkmode == LinkExternal && !iscgo {
// This indicates a user requested -linkmode=external.
// The startup code uses an import of runtime/cgo to decide
// whether to initialize the TLS. So give it one. This could
// be handled differently but it's an unusual case.
loadinternal("runtime/cgo")
if i < len(Ctxt.Library) {
if Ctxt.Library[i].Shlib != "" {
ldshlibsyms(Ctxt.Library[i].Shlib)
} else {
objfile(Ctxt.Library[i].File, Ctxt.Library[i].Pkg)
}
}
}
if Linkmode == LinkInternal {
// Drop all the cgo_import_static declarations.
// Turns out we won't be needing them.
for s := Ctxt.Allsym; s != nil; s = s.Allsym {
if s.Type == obj.SHOSTOBJ {
// If a symbol was marked both
// cgo_import_static and cgo_import_dynamic,
// then we want to make it cgo_import_dynamic
// now.
if s.Extname != "" && s.Dynimplib != "" && s.Cgoexport == 0 {
s.Type = obj.SDYNIMPORT
} else {
s.Type = 0
}
}
}
}
tlsg := Linklookup(Ctxt, "runtime.tlsg", 0)
// For most ports, runtime.tlsg is a placeholder symbol for TLS
// relocation. However, the Android and Darwin arm ports need it
// to be a real variable.
//
// TODO(crawshaw): android should require leaving the tlsg->type
// alone (as the runtime-provided SNOPTRBSS) just like darwin/arm.
// But some other part of the linker is expecting STLSBSS.
if tlsg.Type != obj.SDYNIMPORT && (goos != "darwin" || Thearch.Thechar != '5') {
tlsg.Type = obj.STLSBSS
}
tlsg.Size = int64(Thearch.Ptrsize)
tlsg.Reachable = true
Ctxt.Tlsg = tlsg
// Now that we know the link mode, trim the dynexp list.
x := CgoExportDynamic
if Linkmode == LinkExternal {
x = CgoExportStatic
}
w := 0
for i := 0; i < len(dynexp); i++ {
if int(dynexp[i].Cgoexport)&x != 0 {
dynexp[w] = dynexp[i]
w++
}
}
dynexp = dynexp[:w]
// In internal link mode, read the host object files.
if Linkmode == LinkInternal {
hostobjs()
} else {
hostlinksetup()
}
// We've loaded all the code now.
// If there are no dynamic libraries needed, gcc disables dynamic linking.
// Because of this, glibc's dynamic ELF loader occasionally (like in version 2.13)
// assumes that a dynamic binary always refers to at least one dynamic library.
// Rather than be a source of test cases for glibc, disable dynamic linking
// the same way that gcc would.
//
// Exception: on OS X, programs such as Shark only work with dynamic
// binaries, so leave it enabled on OS X (Mach-O) binaries.
// Also leave it enabled on Solaris which doesn't support
// statically linked binaries.
if Buildmode == BuildmodeExe && havedynamic == 0 && HEADTYPE != obj.Hdarwin && HEADTYPE != obj.Hsolaris {
Debug['d'] = 1
}
importcycles()
}
func genasmsym(put func(*LSym, string, int, int64, int64, int, *LSym)) {
// These symbols won't show up in the first loop below because we
// skip STEXT symbols. Normal STEXT symbols are emitted by walking textp.
s := Linklookup(Ctxt, "runtime.text", 0)
if s.Type == obj.STEXT {
put(s, s.Name, 'T', s.Value, s.Size, int(s.Version), nil)
}
s = Linklookup(Ctxt, "runtime.etext", 0)
if s.Type == obj.STEXT {
put(s, s.Name, 'T', s.Value, s.Size, int(s.Version), nil)
}
for s := Ctxt.Allsym; s != nil; s = s.Allsym {
if s.Hide != 0 || (s.Name[0] == '.' && s.Version == 0 && s.Name != ".rathole") {
continue
}
switch s.Type & obj.SMASK {
case obj.SCONST,
obj.SRODATA,
obj.SSYMTAB,
obj.SPCLNTAB,
obj.SINITARR,
obj.SDATA,
obj.SNOPTRDATA,
obj.SELFROSECT,
obj.SMACHOGOT,
obj.STYPE,
obj.SSTRING,
obj.SGOSTRING,
obj.SGOFUNC,
obj.SWINDOWS:
if !s.Reachable {
continue
}
put(s, s.Name, 'D', Symaddr(s), s.Size, int(s.Version), s.Gotype)
case obj.SBSS, obj.SNOPTRBSS:
if !s.Reachable {
continue
}
if len(s.P) > 0 {
Diag("%s should not be bss (size=%d type=%d special=%d)", s.Name, int(len(s.P)), s.Type, s.Special)
}
put(s, s.Name, 'B', Symaddr(s), s.Size, int(s.Version), s.Gotype)
case obj.SFILE:
put(nil, s.Name, 'f', s.Value, 0, int(s.Version), nil)
case obj.SHOSTOBJ:
if HEADTYPE == obj.Hwindows || Iself {
put(s, s.Name, 'U', s.Value, 0, int(s.Version), nil)
}
case obj.SDYNIMPORT:
if !s.Reachable {
continue
}
put(s, s.Extname, 'U', 0, 0, int(s.Version), nil)
case obj.STLSBSS:
if Linkmode == LinkExternal && HEADTYPE != obj.Hopenbsd {
var type_ int
if goos == "android" {
type_ = 'B'
} else {
type_ = 't'
}
put(s, s.Name, type_, Symaddr(s), s.Size, int(s.Version), s.Gotype)
}
}
}
var a *Auto
var off int32
for s := Ctxt.Textp; s != nil; s = s.Next {
put(s, s.Name, 'T', s.Value, s.Size, int(s.Version), s.Gotype)
// NOTE(ality): acid can't produce a stack trace without .frame symbols
put(nil, ".frame", 'm', int64(s.Locals)+int64(Thearch.Ptrsize), 0, 0, nil)
for a = s.Autom; a != nil; a = a.Link {
// Emit a or p according to actual offset, even if label is wrong.
// This avoids negative offsets, which cannot be encoded.
if a.Name != obj.A_AUTO && a.Name != obj.A_PARAM {
continue
}
// compute offset relative to FP
if a.Name == obj.A_PARAM {
off = a.Aoffset
} else {
off = a.Aoffset - int32(Thearch.Ptrsize)
}
// FP
if off >= 0 {
put(nil, a.Asym.Name, 'p', int64(off), 0, 0, a.Gotype)
continue
}
// SP
if off <= int32(-Thearch.Ptrsize) {
put(nil, a.Asym.Name, 'a', -(int64(off) + int64(Thearch.Ptrsize)), 0, 0, a.Gotype)
continue
}
}
}
// Otherwise, off is addressing the saved program counter.
// Something underhanded is going on. Say nothing.
if Debug['v'] != 0 || Debug['n'] != 0 {
fmt.Fprintf(&Bso, "%5.2f symsize = %d\n", obj.Cputime(), uint32(Symsize))
}
Bflush(&Bso)
}
func ldshlibsyms(shlib string) {
found := false
libpath := ""
for _, libdir := range Ctxt.Libdir {
libpath = filepath.Join(libdir, shlib)
if _, err := os.Stat(libpath); err == nil {
found = true
break
}
}
if !found {
Diag("cannot find shared library: %s", shlib)
return
}
for _, processedname := range Ctxt.Shlibs {
if processedname == libpath {
return
}
}
if Ctxt.Debugvlog > 1 && Ctxt.Bso != nil {
fmt.Fprintf(Ctxt.Bso, "%5.2f ldshlibsyms: found library with name %s at %s\n", obj.Cputime(), shlib, libpath)
Bflush(Ctxt.Bso)
}
f, err := elf.Open(libpath)
if err != nil {
Diag("cannot open shared library: %s", libpath)
return
}
defer f.Close()
syms, err := f.Symbols()
if err != nil {
Diag("cannot read symbols from shared library: %s", libpath)
return
}
// If a package has a global variable of a type defined in another shared
// library, we need to know the gcmask used by the type, if any. To support
// this, we read all the runtime.gcbits.* symbols, keep a map of address to
// gcmask, and after we're read all the symbols, read the addresses of the
// gcmasks symbols out of the type data to look up the gcmask for each type.
// This depends on the fact that the runtime.gcbits.* symbols are local (so
// the address is actually present in the type data and we don't have to
// search all relocations to find the ones which correspond to gcmasks) and
// also that the shared library we are linking against has not had the symbol
// table removed.
gcmasks := make(map[uint64][]byte)
types := []*LSym{}
for _, s := range syms {
if elf.ST_TYPE(s.Info) == elf.STT_NOTYPE || elf.ST_TYPE(s.Info) == elf.STT_SECTION {
continue
}
if s.Section == elf.SHN_UNDEF {
continue
}
if strings.HasPrefix(s.Name, "_") {
continue
}
if strings.HasPrefix(s.Name, "runtime.gcbits.0x") {
data := make([]byte, s.Size)
sect := f.Sections[s.Section]
if sect.Type == elf.SHT_PROGBITS {
n, err := sect.ReadAt(data, int64(s.Value-sect.Offset))
if uint64(n) != s.Size {
Diag("Error reading contents of %s: %v", s.Name, err)
}
}
gcmasks[s.Value] = data
}
if elf.ST_BIND(s.Info) != elf.STB_GLOBAL {
continue
}
lsym := Linklookup(Ctxt, s.Name, 0)
if lsym.Type != 0 && lsym.Dupok == 0 {
Diag(
"Found duplicate symbol %s reading from %s, first found in %s",
s.Name, shlib, lsym.File)
}
lsym.Type = obj.SDYNIMPORT
lsym.File = libpath
if strings.HasPrefix(lsym.Name, "type.") {
data := make([]byte, s.Size)
sect := f.Sections[s.Section]
if sect.Type == elf.SHT_PROGBITS {
n, err := sect.ReadAt(data, int64(s.Value-sect.Offset))
if uint64(n) != s.Size {
Diag("Error reading contents of %s: %v", s.Name, err)
}
lsym.P = data
}
if !strings.HasPrefix(lsym.Name, "type..") {
types = append(types, lsym)
}
}
}
for _, t := range types {
if decodetype_noptr(t) != 0 || decodetype_usegcprog(t) != 0 {
continue
}
// The expression on the next line is a copy of the expression from
// decodetype_gcmask in decodesym.go, which in turn depends on details of
// how the type data is laid out, as seen in gc/reflect.go:dcommontype.
addr := decode_inuxi(t.P[1*int32(Thearch.Ptrsize)+8+1*int32(Thearch.Ptrsize):], Thearch.Ptrsize)
tgcmask, ok := gcmasks[addr]
if !ok {
Diag("bits not found for %s at %d", t.Name, addr)
}
t.gcmask = tgcmask
}
// We might have overwritten some functions above (this tends to happen for the
// autogenerated type equality/hashing functions) and we don't want to generated
// pcln table entries for these any more so unstitch them from the Textp linked
// list.
var last *LSym
for s := Ctxt.Textp; s != nil; s = s.Next {
if s.Type == obj.SDYNIMPORT {
continue
}
if last == nil {
Ctxt.Textp = s
} else {
last.Next = s
}
last = s
}
if last == nil {
Ctxt.Textp = nil
Ctxt.Etextp = nil
} else {
last.Next = nil
Ctxt.Etextp = last
}
Ctxt.Shlibs = append(Ctxt.Shlibs, libpath)
}
func ldelf(f *Biobuf, pkg string, length int64, pn string) {
if Debug['v'] != 0 {
fmt.Fprintf(&Bso, "%5.2f ldelf %s\n", obj.Cputime(), pn)
}
Ctxt.Version++
base := int32(Boffset(f))
var add uint64
var e binary.ByteOrder
var elfobj *ElfObj
var err error
var flag int
var hdr *ElfHdrBytes
var hdrbuf [64]uint8
var info uint64
var is64 int
var j int
var n int
var name string
var p []byte
var r []Reloc
var rela int
var rp *Reloc
var rsect *ElfSect
var s *LSym
var sect *ElfSect
var sym ElfSym
var symbols []*LSym
if Bread(f, hdrbuf[:]) != len(hdrbuf) {
goto bad
}
hdr = new(ElfHdrBytes)
binary.Read(bytes.NewReader(hdrbuf[:]), binary.BigEndian, hdr) // only byte arrays; byte order doesn't matter
if string(hdr.Ident[:4]) != "\x7FELF" {
goto bad
}
switch hdr.Ident[5] {
case ElfDataLsb:
e = binary.LittleEndian
case ElfDataMsb:
e = binary.BigEndian
default:
goto bad
}
// read header
elfobj = new(ElfObj)
elfobj.e = e
elfobj.f = f
elfobj.base = int64(base)
elfobj.length = length
elfobj.name = pn
is64 = 0
if hdr.Ident[4] == ElfClass64 {
is64 = 1
hdr := new(ElfHdrBytes64)
binary.Read(bytes.NewReader(hdrbuf[:]), binary.BigEndian, hdr) // only byte arrays; byte order doesn't matter
elfobj.type_ = uint32(e.Uint16(hdr.Type[:]))
elfobj.machine = uint32(e.Uint16(hdr.Machine[:]))
elfobj.version = e.Uint32(hdr.Version[:])
elfobj.phoff = e.Uint64(hdr.Phoff[:])
elfobj.shoff = e.Uint64(hdr.Shoff[:])
elfobj.flags = e.Uint32(hdr.Flags[:])
elfobj.ehsize = uint32(e.Uint16(hdr.Ehsize[:]))
elfobj.phentsize = uint32(e.Uint16(hdr.Phentsize[:]))
elfobj.phnum = uint32(e.Uint16(hdr.Phnum[:]))
elfobj.shentsize = uint32(e.Uint16(hdr.Shentsize[:]))
elfobj.shnum = uint32(e.Uint16(hdr.Shnum[:]))
elfobj.shstrndx = uint32(e.Uint16(hdr.Shstrndx[:]))
} else {
elfobj.type_ = uint32(e.Uint16(hdr.Type[:]))
elfobj.machine = uint32(e.Uint16(hdr.Machine[:]))
elfobj.version = e.Uint32(hdr.Version[:])
elfobj.entry = uint64(e.Uint32(hdr.Entry[:]))
elfobj.phoff = uint64(e.Uint32(hdr.Phoff[:]))
elfobj.shoff = uint64(e.Uint32(hdr.Shoff[:]))
elfobj.flags = e.Uint32(hdr.Flags[:])
elfobj.ehsize = uint32(e.Uint16(hdr.Ehsize[:]))
elfobj.phentsize = uint32(e.Uint16(hdr.Phentsize[:]))
elfobj.phnum = uint32(e.Uint16(hdr.Phnum[:]))
elfobj.shentsize = uint32(e.Uint16(hdr.Shentsize[:]))
elfobj.shnum = uint32(e.Uint16(hdr.Shnum[:]))
elfobj.shstrndx = uint32(e.Uint16(hdr.Shstrndx[:]))
}
elfobj.is64 = is64
if uint32(hdr.Ident[6]) != elfobj.version {
goto bad
}
if e.Uint16(hdr.Type[:]) != ElfTypeRelocatable {
Diag("%s: elf but not elf relocatable object", pn)
return
}
switch Thearch.Thechar {
default:
Diag("%s: elf %s unimplemented", pn, Thestring)
return
case '5':
if e != binary.LittleEndian || elfobj.machine != ElfMachArm || hdr.Ident[4] != ElfClass32 {
Diag("%s: elf object but not arm", pn)
return
}
case '6':
if e != binary.LittleEndian || elfobj.machine != ElfMachAmd64 || hdr.Ident[4] != ElfClass64 {
Diag("%s: elf object but not amd64", pn)
return
}
case '7':
if e != binary.LittleEndian || elfobj.machine != ElfMachArm64 || hdr.Ident[4] != ElfClass64 {
Diag("%s: elf object but not arm64", pn)
return
}
case '8':
if e != binary.LittleEndian || elfobj.machine != ElfMach386 || hdr.Ident[4] != ElfClass32 {
Diag("%s: elf object but not 386", pn)
return
}
case '9':
if elfobj.machine != ElfMachPower64 || hdr.Ident[4] != ElfClass64 {
Diag("%s: elf object but not ppc64", pn)
return
}
}
// load section list into memory.
elfobj.sect = make([]ElfSect, elfobj.shnum)
elfobj.nsect = uint(elfobj.shnum)
for i := 0; uint(i) < elfobj.nsect; i++ {
if Bseek(f, int64(uint64(base)+elfobj.shoff+uint64(int64(i)*int64(elfobj.shentsize))), 0) < 0 {
goto bad
}
sect = &elfobj.sect[i]
if is64 != 0 {
var b ElfSectBytes64
if err = binary.Read(f, e, &b); err != nil {
goto bad
}
sect.nameoff = uint32(e.Uint32(b.Name[:]))
sect.type_ = e.Uint32(b.Type[:])
sect.flags = e.Uint64(b.Flags[:])
sect.addr = e.Uint64(b.Addr[:])
sect.off = e.Uint64(b.Off[:])
sect.size = e.Uint64(b.Size[:])
sect.link = e.Uint32(b.Link[:])
sect.info = e.Uint32(b.Info[:])
sect.align = e.Uint64(b.Align[:])
sect.entsize = e.Uint64(b.Entsize[:])
} else {
var b ElfSectBytes
if err = binary.Read(f, e, &b); err != nil {
goto bad
}
sect.nameoff = uint32(e.Uint32(b.Name[:]))
sect.type_ = e.Uint32(b.Type[:])
sect.flags = uint64(e.Uint32(b.Flags[:]))
sect.addr = uint64(e.Uint32(b.Addr[:]))
sect.off = uint64(e.Uint32(b.Off[:]))
sect.size = uint64(e.Uint32(b.Size[:]))
sect.link = e.Uint32(b.Link[:])
sect.info = e.Uint32(b.Info[:])
sect.align = uint64(e.Uint32(b.Align[:]))
sect.entsize = uint64(e.Uint32(b.Entsize[:]))
}
}
// read section string table and translate names
if elfobj.shstrndx >= uint32(elfobj.nsect) {
err = fmt.Errorf("shstrndx out of range %d >= %d", elfobj.shstrndx, elfobj.nsect)
goto bad
}
sect = &elfobj.sect[elfobj.shstrndx]
if err = elfmap(elfobj, sect); err != nil {
goto bad
}
for i := 0; uint(i) < elfobj.nsect; i++ {
if elfobj.sect[i].nameoff != 0 {
elfobj.sect[i].name = cstring(sect.base[elfobj.sect[i].nameoff:])
}
}
// load string table for symbols into memory.
elfobj.symtab = section(elfobj, ".symtab")
if elfobj.symtab == nil {
// our work is done here - no symbols means nothing can refer to this file
return
}
if elfobj.symtab.link <= 0 || elfobj.symtab.link >= uint32(elfobj.nsect) {
Diag("%s: elf object has symbol table with invalid string table link", pn)
return
}
elfobj.symstr = &elfobj.sect[elfobj.symtab.link]
if is64 != 0 {
elfobj.nsymtab = int(elfobj.symtab.size / ELF64SYMSIZE)
} else {
elfobj.nsymtab = int(elfobj.symtab.size / ELF32SYMSIZE)
}
if err = elfmap(elfobj, elfobj.symtab); err != nil {
goto bad
}
if err = elfmap(elfobj, elfobj.symstr); err != nil {
goto bad
}
// load text and data segments into memory.
// they are not as small as the section lists, but we'll need
// the memory anyway for the symbol images, so we might
// as well use one large chunk.
// create symbols for elfmapped sections
for i := 0; uint(i) < elfobj.nsect; i++ {
sect = &elfobj.sect[i]
if (sect.type_ != ElfSectProgbits && sect.type_ != ElfSectNobits) || sect.flags&ElfSectFlagAlloc == 0 {
continue
}
if sect.type_ != ElfSectNobits {
if err = elfmap(elfobj, sect); err != nil {
goto bad
}
}
name = fmt.Sprintf("%s(%s)", pkg, sect.name)
s = Linklookup(Ctxt, name, Ctxt.Version)
switch int(sect.flags) & (ElfSectFlagAlloc | ElfSectFlagWrite | ElfSectFlagExec) {
default:
err = fmt.Errorf("unexpected flags for ELF section %s", sect.name)
goto bad
case ElfSectFlagAlloc:
s.Type = obj.SRODATA
case ElfSectFlagAlloc + ElfSectFlagWrite:
if sect.type_ == ElfSectNobits {
s.Type = obj.SNOPTRBSS
} else {
s.Type = obj.SNOPTRDATA
}
case ElfSectFlagAlloc + ElfSectFlagExec:
s.Type = obj.STEXT
}
if sect.name == ".got" || sect.name == ".toc" {
s.Type = obj.SELFGOT
}
if sect.type_ == ElfSectProgbits {
s.P = sect.base
s.P = s.P[:sect.size]
}
s.Size = int64(sect.size)
s.Align = int32(sect.align)
sect.sym = s
}
// enter sub-symbols into symbol table.
// symbol 0 is the null symbol.
symbols = make([]*LSym, elfobj.nsymtab)
for i := 1; i < elfobj.nsymtab; i++ {
if err = readelfsym(elfobj, i, &sym, 1); err != nil {
goto bad
}
symbols[i] = sym.sym
if sym.type_ != ElfSymTypeFunc && sym.type_ != ElfSymTypeObject && sym.type_ != ElfSymTypeNone {
continue
}
if sym.shndx == ElfSymShnCommon {
s = sym.sym
if uint64(s.Size) < sym.size {
s.Size = int64(sym.size)
}
if s.Type == 0 || s.Type == obj.SXREF {
s.Type = obj.SNOPTRBSS
}
continue
}
if uint(sym.shndx) >= elfobj.nsect || sym.shndx == 0 {
continue
}
// even when we pass needSym == 1 to readelfsym, it might still return nil to skip some unwanted symbols
if sym.sym == nil {
continue
}
sect = &elfobj.sect[sym.shndx:][0]
if sect.sym == nil {
if strings.HasPrefix(sym.name, ".Linfo_string") { // clang does this
continue
}
Diag("%s: sym#%d: ignoring %s in section %d (type %d)", pn, i, sym.name, sym.shndx, sym.type_)
continue
}
s = sym.sym
if s.Outer != nil {
if s.Dupok != 0 {
continue
}
Exitf("%s: duplicate symbol reference: %s in both %s and %s", pn, s.Name, s.Outer.Name, sect.sym.Name)
}
s.Sub = sect.sym.Sub
sect.sym.Sub = s
s.Type = sect.sym.Type | s.Type&^obj.SMASK | obj.SSUB
if s.Cgoexport&CgoExportDynamic == 0 {
s.Dynimplib = "" // satisfy dynimport
}
s.Value = int64(sym.value)
s.Size = int64(sym.size)
s.Outer = sect.sym
if sect.sym.Type == obj.STEXT {
if s.External != 0 && s.Dupok == 0 {
Diag("%s: duplicate definition of %s", pn, s.Name)
}
s.External = 1
}
if elfobj.machine == ElfMachPower64 {
flag = int(sym.other) >> 5
if 2 <= flag && flag <= 6 {
s.Localentry = 1 << uint(flag-2)
} else if flag == 7 {
Diag("%s: invalid sym.other 0x%x for %s", pn, sym.other, s.Name)
}
}
}
// Sort outer lists by address, adding to textp.
// This keeps textp in increasing address order.
for i := 0; uint(i) < elfobj.nsect; i++ {
s = elfobj.sect[i].sym
if s == nil {
continue
}
if s.Sub != nil {
s.Sub = listsort(s.Sub, valuecmp, listsubp)
}
if s.Type == obj.STEXT {
if s.Onlist != 0 {
log.Fatalf("symbol %s listed multiple times", s.Name)
}
s.Onlist = 1
if Ctxt.Etextp != nil {
Ctxt.Etextp.Next = s
} else {
Ctxt.Textp = s
}
Ctxt.Etextp = s
for s = s.Sub; s != nil; s = s.Sub {
if s.Onlist != 0 {
log.Fatalf("symbol %s listed multiple times", s.Name)
}
s.Onlist = 1
Ctxt.Etextp.Next = s
Ctxt.Etextp = s
}
}
}
// load relocations
for i := 0; uint(i) < elfobj.nsect; i++ {
rsect = &elfobj.sect[i]
if rsect.type_ != ElfSectRela && rsect.type_ != ElfSectRel {
continue
}
if rsect.info >= uint32(elfobj.nsect) || elfobj.sect[rsect.info].base == nil {
continue
}
sect = &elfobj.sect[rsect.info]
if err = elfmap(elfobj, rsect); err != nil {
goto bad
}
rela = 0
if rsect.type_ == ElfSectRela {
rela = 1
}
n = int(rsect.size / uint64(4+4*is64) / uint64(2+rela))
r = make([]Reloc, n)
p = rsect.base
for j = 0; j < n; j++ {
add = 0
rp = &r[j]
if is64 != 0 {
// 64-bit rel/rela
rp.Off = int32(e.Uint64(p))
p = p[8:]
info = e.Uint64(p)
p = p[8:]
if rela != 0 {
add = e.Uint64(p)
p = p[8:]
}
} else {
// 32-bit rel/rela
rp.Off = int32(e.Uint32(p))
p = p[4:]
info = uint64(e.Uint32(p))
info = info>>8<<32 | info&0xff // convert to 64-bit info
p = p[4:]
if rela != 0 {
add = uint64(e.Uint32(p))
p = p[4:]
}
}
if info&0xffffffff == 0 { // skip R_*_NONE relocation
j--
n--
continue
}
if info>>32 == 0 { // absolute relocation, don't bother reading the null symbol
rp.Sym = nil
} else {
if err = readelfsym(elfobj, int(info>>32), &sym, 0); err != nil {
goto bad
}
sym.sym = symbols[info>>32]
if sym.sym == nil {
err = fmt.Errorf("%s#%d: reloc of invalid sym #%d %s shndx=%d type=%d", sect.sym.Name, j, int(info>>32), sym.name, sym.shndx, sym.type_)
goto bad
}
rp.Sym = sym.sym
}
rp.Type = int32(reltype(pn, int(uint32(info)), &rp.Siz))
if rela != 0 {
rp.Add = int64(add)
} else {
// load addend from image
if rp.Siz == 4 {
rp.Add = int64(e.Uint32(sect.base[rp.Off:]))
} else if rp.Siz == 8 {
rp.Add = int64(e.Uint64(sect.base[rp.Off:]))
} else {
Diag("invalid rela size %d", rp.Siz)
}
}
if rp.Siz == 2 {
rp.Add = int64(int16(rp.Add))
}
if rp.Siz == 4 {
rp.Add = int64(int32(rp.Add))
}
}
//print("rel %s %d %d %s %#llx\n", sect->sym->name, rp->type, rp->siz, rp->sym->name, rp->add);
sort.Sort(rbyoff(r[:n]))
// just in case
s = sect.sym
s.R = r
s.R = s.R[:n]
}
return
bad:
Diag("%s: malformed elf file: %v", pn, err)
}
