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 linknew(arch *LinkArch) *Link {
ctxt := new(Link)
ctxt.Hash = make(map[symVer]*LSym)
ctxt.Arch = arch
ctxt.Version = obj.HistVersion
ctxt.Goroot = obj.Getgoroot()
p := obj.Getgoarch()
if p != arch.Name {
log.Fatalf("invalid goarch %s (want %s)", p, arch.Name)
}
var buf string
buf, _ = os.Getwd()
if buf == "" {
buf = "/???"
}
buf = filepath.ToSlash(buf)
ctxt.Headtype = headtype(obj.Getgoos())
if ctxt.Headtype < 0 {
log.Fatalf("unknown goos %s", obj.Getgoos())
}
// Record thread-local storage offset.
// TODO(rsc): Move tlsoffset back into the linker.
switch ctxt.Headtype {
default:
log.Fatalf("unknown thread-local storage offset for %s", Headstr(ctxt.Headtype))
case obj.Hplan9, obj.Hwindows:
break
/*
* ELF uses TLS offset negative from FS.
* Translate 0(FS) and 8(FS) into -16(FS) and -8(FS).
* Known to low-level assembly in package runtime and runtime/cgo.
*/
case obj.Hlinux,
obj.Hfreebsd,
obj.Hnetbsd,
obj.Hopenbsd,
obj.Hdragonfly,
obj.Hsolaris:
ctxt.Tlsoffset = -1 * ctxt.Arch.Ptrsize
case obj.Hnacl:
switch ctxt.Arch.Thechar {
default:
log.Fatalf("unknown thread-local storage offset for nacl/%s", ctxt.Arch.Name)
case '5':
ctxt.Tlsoffset = 0
case '6':
ctxt.Tlsoffset = 0
case '8':
ctxt.Tlsoffset = -8
}
/*
* OS X system constants - offset from 0(GS) to our TLS.
* Explained in ../../runtime/cgo/gcc_darwin_*.c.
*/
case obj.Hdarwin:
switch ctxt.Arch.Thechar {
default:
log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name)
case '5':
ctxt.Tlsoffset = 0 // dummy value, not needed
case '6':
ctxt.Tlsoffset = 0x8a0
case '7':
ctxt.Tlsoffset = 0 // dummy value, not needed
case '8':
ctxt.Tlsoffset = 0x468
}
}
// On arm, record goarm.
if ctxt.Arch.Thechar == '5' {
p := obj.Getgoarm()
if p != "" {
ctxt.Goarm = int32(obj.Atoi(p))
} else {
ctxt.Goarm = 6
}
}
return ctxt
}