func (r *objReader) readSym() {
if c, err := r.rd.ReadByte(); c != symPrefix || err != nil {
log.Fatalln("readSym out of sync")
}
t := obj.SymKind(r.readInt())
s := r.readSymIndex()
flags := r.readInt()
dupok := flags&1 != 0
local := flags&2 != 0
makeTypelink := flags&4 != 0
size := r.readInt()
typ := r.readSymIndex()
data := r.readData()
nreloc := r.readInt()
pkg := pathtoprefix(r.lib.Pkg)
isdup := false
var dup *Symbol
if s.Type != 0 && s.Type != obj.SXREF {
if (t == obj.SDATA || t == obj.SBSS || t == obj.SNOPTRBSS) && len(data) == 0 && nreloc == 0 {
if s.Size < int64(size) {
s.Size = int64(size)
}
if typ != nil && s.Gotype == nil {
s.Gotype = typ
}
return
}
if (s.Type == obj.SDATA || s.Type == obj.SBSS || s.Type == obj.SNOPTRBSS) && len(s.P) == 0 && len(s.R) == 0 {
goto overwrite
}
if s.Type != obj.SBSS && s.Type != obj.SNOPTRBSS && !dupok && !s.Attr.DuplicateOK() {
log.Fatalf("duplicate symbol %s (types %d and %d) in %s and %s", s.Name, s.Type, t, s.File, r.pn)
}
if len(s.P) > 0 {
dup = s
s = r.dupSym
isdup = true
}
}
overwrite:
s.File = pkg
if dupok {
s.Attr |= AttrDuplicateOK
}
if t == obj.SXREF {
log.Fatalf("bad sxref")
}
if t == 0 {
log.Fatalf("missing type for %s in %s", s.Name, r.pn)
}
if t == obj.SBSS && (s.Type == obj.SRODATA || s.Type == obj.SNOPTRBSS) {
t = s.Type
}
s.Type = t
if s.Size < int64(size) {
s.Size = int64(size)
}
s.Attr.Set(AttrLocal, local)
s.Attr.Set(AttrMakeTypelink, makeTypelink)
if typ != nil {
s.Gotype = typ
}
if isdup && typ != nil { // if bss sym defined multiple times, take type from any one def
dup.Gotype = typ
}
s.P = data
if nreloc > 0 {
s.R = r.reloc[:nreloc:nreloc]
if !isdup {
r.reloc = r.reloc[nreloc:]
}
for i := 0; i < nreloc; i++ {
s.R[i] = Reloc{
Off: r.readInt32(),
Siz: r.readUint8(),
Type: obj.RelocType(r.readInt32()),
Add: r.readInt64(),
Sym: r.readSymIndex(),
}
}
}
if s.Type == obj.STEXT {
s.FuncInfo = new(FuncInfo)
pc := s.FuncInfo
pc.Args = r.readInt32()
pc.Locals = r.readInt32()
if r.readUint8() != 0 {
s.Attr |= AttrNoSplit
}
flags := r.readInt()
if flags&(1<<2) != 0 {
s.Attr |= AttrReflectMethod
}
n := r.readInt()
pc.Autom = r.autom[:n:n]
if !isdup {
r.autom = r.autom[n:]
}
for i := 0; i < n; i++ {
pc.Autom[i] = Auto{
Asym: r.readSymIndex(),
Aoffset: r.readInt32(),
Name: r.readInt16(),
Gotype: r.readSymIndex(),
}
}
pc.Pcsp.P = r.readData()
pc.Pcfile.P = r.readData()
pc.Pcline.P = r.readData()
n = r.readInt()
pc.Pcdata = r.pcdata[:n:n]
if !isdup {
r.pcdata = r.pcdata[n:]
}
for i := 0; i < n; i++ {
pc.Pcdata[i].P = r.readData()
}
n = r.readInt()
pc.Funcdata = r.funcdata[:n:n]
pc.Funcdataoff = r.funcdataoff[:n:n]
if !isdup {
r.funcdata = r.funcdata[n:]
r.funcdataoff = r.funcdataoff[n:]
}
for i := 0; i < n; i++ {
pc.Funcdata[i] = r.readSymIndex()
}
for i := 0; i < n; i++ {
pc.Funcdataoff[i] = r.readInt64()
}
n = r.readInt()
pc.File = r.file[:n:n]
if !isdup {
r.file = r.file[n:]
}
for i := 0; i < n; i++ {
pc.File[i] = r.readSymIndex()
}
if !dupok {
if s.Attr.OnList() {
log.Fatalf("symbol %s listed multiple times", s.Name)
}
s.Attr |= AttrOnList
r.lib.textp = append(r.lib.textp, s)
} else {
// there may ba a dup in another package
// put into a temp list and add to text later
if !isdup {
r.lib.dupTextSyms = append(r.lib.dupTextSyms, s)
} else {
r.lib.dupTextSyms = append(r.lib.dupTextSyms, dup)
}
}
}
if s.Type == obj.SDWARFINFO {
r.patchDWARFName(s)
}
}
func ldmacho(ctxt *Link, f *bio.Reader, pkg string, length int64, pn string) {
var err error
var j int
var is64 bool
var secaddr uint64
var hdr [7 * 4]uint8
var cmdp []byte
var dat []byte
var ncmd uint32
var cmdsz uint32
var ty uint32
var sz uint32
var off uint32
var m *ldMachoObj
var e binary.ByteOrder
var sect *ldMachoSect
var rel *ldMachoRel
var rpi int
var s *Symbol
var s1 *Symbol
var outer *Symbol
var c *ldMachoCmd
var symtab *ldMachoSymtab
var dsymtab *ldMachoDysymtab
var sym *ldMachoSym
var r []Reloc
var rp *Reloc
var name string
localSymVersion := ctxt.Syms.IncVersion()
base := f.Offset()
if _, err := io.ReadFull(f, hdr[:]); err != nil {
goto bad
}
if binary.BigEndian.Uint32(hdr[:])&^1 == 0xFEEDFACE {
e = binary.BigEndian
} else if binary.LittleEndian.Uint32(hdr[:])&^1 == 0xFEEDFACE {
e = binary.LittleEndian
} else {
err = fmt.Errorf("bad magic - not mach-o file")
goto bad
}
is64 = e.Uint32(hdr[:]) == 0xFEEDFACF
ncmd = e.Uint32(hdr[4*4:])
cmdsz = e.Uint32(hdr[5*4:])
if ncmd > 0x10000 || cmdsz >= 0x01000000 {
err = fmt.Errorf("implausible mach-o header ncmd=%d cmdsz=%d", ncmd, cmdsz)
goto bad
}
if is64 {
f.Seek(4, 1) // skip reserved word in header
}
m = new(ldMachoObj)
m.f = f
m.e = e
m.cputype = uint(e.Uint32(hdr[1*4:]))
m.subcputype = uint(e.Uint32(hdr[2*4:]))
m.filetype = e.Uint32(hdr[3*4:])
m.ncmd = uint(ncmd)
m.flags = e.Uint32(hdr[6*4:])
m.is64 = is64
m.base = base
m.length = length
m.name = pn
switch SysArch.Family {
default:
Errorf(nil, "%s: mach-o %s unimplemented", pn, SysArch.Name)
return
case sys.AMD64:
if e != binary.LittleEndian || m.cputype != LdMachoCpuAmd64 {
Errorf(nil, "%s: mach-o object but not amd64", pn)
return
}
case sys.I386:
if e != binary.LittleEndian || m.cputype != LdMachoCpu386 {
Errorf(nil, "%s: mach-o object but not 386", pn)
return
}
}
m.cmd = make([]ldMachoCmd, ncmd)
off = uint32(len(hdr))
cmdp = make([]byte, cmdsz)
if _, err2 := io.ReadFull(f, cmdp); err2 != nil {
err = fmt.Errorf("reading cmds: %v", err)
goto bad
}
// read and parse load commands
c = nil
symtab = nil
dsymtab = nil
for i := 0; uint32(i) < ncmd; i++ {
ty = e.Uint32(cmdp)
sz = e.Uint32(cmdp[4:])
m.cmd[i].off = off
unpackcmd(cmdp, m, &m.cmd[i], uint(ty), uint(sz))
cmdp = cmdp[sz:]
off += sz
if ty == LdMachoCmdSymtab {
if symtab != nil {
err = fmt.Errorf("multiple symbol tables")
goto bad
}
symtab = &m.cmd[i].sym
macholoadsym(m, symtab)
}
if ty == LdMachoCmdDysymtab {
dsymtab = &m.cmd[i].dsym
macholoaddsym(m, dsymtab)
}
if (is64 && ty == LdMachoCmdSegment64) || (!is64 && ty == LdMachoCmdSegment) {
if c != nil {
err = fmt.Errorf("multiple load commands")
goto bad
}
c = &m.cmd[i]
}
}
// load text and data segments into memory.
// they are not as small as the load commands, but we'll need
// the memory anyway for the symbol images, so we might
// as well use one large chunk.
if c == nil {
err = fmt.Errorf("no load command")
goto bad
}
if symtab == nil {
// our work is done here - no symbols means nothing can refer to this file
return
}
if int64(c.seg.fileoff+c.seg.filesz) >= length {
err = fmt.Errorf("load segment out of range")
goto bad
}
dat = make([]byte, c.seg.filesz)
if f.Seek(m.base+int64(c.seg.fileoff), 0) < 0 {
err = fmt.Errorf("cannot load object data: %v", err)
goto bad
}
if _, err2 := io.ReadFull(f, dat); err2 != nil {
err = fmt.Errorf("cannot load object data: %v", err)
goto bad
}
for i := 0; uint32(i) < c.seg.nsect; i++ {
sect = &c.seg.sect[i]
if sect.segname != "__TEXT" && sect.segname != "__DATA" {
continue
}
if sect.name == "__eh_frame" {
continue
}
name = fmt.Sprintf("%s(%s/%s)", pkg, sect.segname, sect.name)
s = ctxt.Syms.Lookup(name, localSymVersion)
if s.Type != 0 {
err = fmt.Errorf("duplicate %s/%s", sect.segname, sect.name)
goto bad
}
if sect.flags&0xff == 1 { // S_ZEROFILL
s.P = make([]byte, sect.size)
} else {
s.P = dat[sect.addr-c.seg.vmaddr:][:sect.size]
}
s.Size = int64(len(s.P))
if sect.segname == "__TEXT" {
if sect.name == "__text" {
s.Type = obj.STEXT
} else {
s.Type = obj.SRODATA
}
} else {
if sect.name == "__bss" {
s.Type = obj.SNOPTRBSS
s.P = s.P[:0]
} else {
s.Type = obj.SNOPTRDATA
}
}
sect.sym = s
}
// enter sub-symbols into symbol table.
// have to guess sizes from next symbol.
for i := 0; uint32(i) < symtab.nsym; i++ {
sym = &symtab.sym[i]
if sym.type_&N_STAB != 0 {
continue
}
// TODO: check sym->type against outer->type.
name = sym.name
if name[0] == '_' && name[1] != '\x00' {
name = name[1:]
}
v := 0
if sym.type_&N_EXT == 0 {
v = localSymVersion
}
s = ctxt.Syms.Lookup(name, v)
if sym.type_&N_EXT == 0 {
s.Attr |= AttrDuplicateOK
}
sym.sym = s
if sym.sectnum == 0 { // undefined
continue
}
if uint32(sym.sectnum) > c.seg.nsect {
err = fmt.Errorf("reference to invalid section %d", sym.sectnum)
goto bad
}
sect = &c.seg.sect[sym.sectnum-1]
outer = sect.sym
if outer == nil {
err = fmt.Errorf("reference to invalid section %s/%s", sect.segname, sect.name)
continue
}
if s.Outer != nil {
if s.Attr.DuplicateOK() {
continue
}
Exitf("%s: duplicate symbol reference: %s in both %s and %s", pn, s.Name, s.Outer.Name, sect.sym.Name)
}
s.Type = outer.Type | obj.SSUB
s.Sub = outer.Sub
outer.Sub = s
s.Outer = outer
s.Value = int64(sym.value - sect.addr)
if !s.Attr.CgoExportDynamic() {
s.Dynimplib = "" // satisfy dynimport
}
if outer.Type == obj.STEXT {
if s.Attr.External() && !s.Attr.DuplicateOK() {
Errorf(s, "%s: duplicate symbol definition", pn)
}
s.Attr |= AttrExternal
}
sym.sym = s
}
// Sort outer lists by address, adding to textp.
// This keeps textp in increasing address order.
for i := 0; uint32(i) < c.seg.nsect; i++ {
sect = &c.seg.sect[i]
s = sect.sym
if s == nil {
continue
}
if s.Sub != nil {
s.Sub = listsort(s.Sub)
// assign sizes, now that we know symbols in sorted order.
for s1 = s.Sub; s1 != nil; s1 = s1.Sub {
if s1.Sub != nil {
s1.Size = s1.Sub.Value - s1.Value
} else {
s1.Size = s.Value + s.Size - s1.Value
}
}
}
if s.Type == obj.STEXT {
if s.Attr.OnList() {
log.Fatalf("symbol %s listed multiple times", s.Name)
}
s.Attr |= AttrOnList
ctxt.Textp = append(ctxt.Textp, s)
for s1 = s.Sub; s1 != nil; s1 = s1.Sub {
if s1.Attr.OnList() {
log.Fatalf("symbol %s listed multiple times", s1.Name)
}
s1.Attr |= AttrOnList
ctxt.Textp = append(ctxt.Textp, s1)
}
}
}
// load relocations
for i := 0; uint32(i) < c.seg.nsect; i++ {
sect = &c.seg.sect[i]
s = sect.sym
if s == nil {
continue
}
macholoadrel(m, sect)
if sect.rel == nil {
continue
}
r = make([]Reloc, sect.nreloc)
rpi = 0
Reloc:
for j = 0; uint32(j) < sect.nreloc; j++ {
rp = &r[rpi]
rel = §.rel[j]
if rel.scattered != 0 {
if SysArch.Family != sys.I386 {
// mach-o only uses scattered relocation on 32-bit platforms
Errorf(s, "unexpected scattered relocation")
continue
}
// on 386, rewrite scattered 4/1 relocation and some
// scattered 2/1 relocation into the pseudo-pc-relative
// reference that it is.
// assume that the second in the pair is in this section
// and use that as the pc-relative base.
if uint32(j+1) >= sect.nreloc {
err = fmt.Errorf("unsupported scattered relocation %d", int(rel.type_))
goto bad
}
if sect.rel[j+1].scattered == 0 || sect.rel[j+1].type_ != 1 || (rel.type_ != 4 && rel.type_ != 2) || uint64(sect.rel[j+1].value) < sect.addr || uint64(sect.rel[j+1].value) >= sect.addr+sect.size {
err = fmt.Errorf("unsupported scattered relocation %d/%d", int(rel.type_), int(sect.rel[j+1].type_))
goto bad
}
rp.Siz = rel.length
rp.Off = int32(rel.addr)
// NOTE(rsc): I haven't worked out why (really when)
// we should ignore the addend on a
// scattered relocation, but it seems that the
// common case is we ignore it.
// It's likely that this is not strictly correct
// and that the math should look something
// like the non-scattered case below.
rp.Add = 0
// want to make it pc-relative aka relative to rp->off+4
// but the scatter asks for relative to off = sect->rel[j+1].value - sect->addr.
// adjust rp->add accordingly.
rp.Type = obj.R_PCREL
rp.Add += int64(uint64(int64(rp.Off)+4) - (uint64(sect.rel[j+1].value) - sect.addr))
// now consider the desired symbol.
// find the section where it lives.
var ks *ldMachoSect
for k := 0; uint32(k) < c.seg.nsect; k++ {
ks = &c.seg.sect[k]
if ks.addr <= uint64(rel.value) && uint64(rel.value) < ks.addr+ks.size {
if ks.sym != nil {
rp.Sym = ks.sym
rp.Add += int64(uint64(rel.value) - ks.addr)
} else if ks.segname == "__IMPORT" && ks.name == "__pointers" {
// handle reference to __IMPORT/__pointers.
// how much worse can this get?
// why are we supporting 386 on the mac anyway?
rp.Type = 512 + MACHO_FAKE_GOTPCREL
// figure out which pointer this is a reference to.
k = int(uint64(ks.res1) + (uint64(rel.value)-ks.addr)/4)
// load indirect table for __pointers
// fetch symbol number
if dsymtab == nil || k < 0 || uint32(k) >= dsymtab.nindirectsyms || dsymtab.indir == nil {
err = fmt.Errorf("invalid scattered relocation: indirect symbol reference out of range")
goto bad
}
k = int(dsymtab.indir[k])
if k < 0 || uint32(k) >= symtab.nsym {
err = fmt.Errorf("invalid scattered relocation: symbol reference out of range")
goto bad
}
rp.Sym = symtab.sym[k].sym
} else {
err = fmt.Errorf("unsupported scattered relocation: reference to %s/%s", ks.segname, ks.name)
goto bad
}
rpi++
// skip #1 of 2 rel; continue skips #2 of 2.
j++
continue Reloc
}
}
err = fmt.Errorf("unsupported scattered relocation: invalid address %#x", rel.addr)
goto bad
}
rp.Siz = rel.length
rp.Type = 512 + (obj.RelocType(rel.type_) << 1) + obj.RelocType(rel.pcrel)
rp.Off = int32(rel.addr)
// Handle X86_64_RELOC_SIGNED referencing a section (rel->extrn == 0).
if SysArch.Family == sys.AMD64 && rel.extrn == 0 && rel.type_ == 1 {
// Calculate the addend as the offset into the section.
//
// The rip-relative offset stored in the object file is encoded
// as follows:
//
// movsd 0x00000360(%rip),%xmm0
//
// To get the absolute address of the value this rip-relative address is pointing
// to, we must add the address of the next instruction to it. This is done by
// taking the address of the relocation and adding 4 to it (since the rip-relative
// offset can at most be 32 bits long). To calculate the offset into the section the
// relocation is referencing, we subtract the vaddr of the start of the referenced
// section found in the original object file.
//
// [For future reference, see Darwin's /usr/include/mach-o/x86_64/reloc.h]
secaddr = c.seg.sect[rel.symnum-1].addr
rp.Add = int64(uint64(int64(int32(e.Uint32(s.P[rp.Off:])))+int64(rp.Off)+4) - secaddr)
} else {
rp.Add = int64(int32(e.Uint32(s.P[rp.Off:])))
}
// For i386 Mach-O PC-relative, the addend is written such that
// it *is* the PC being subtracted. Use that to make
// it match our version of PC-relative.
if rel.pcrel != 0 && SysArch.Family == sys.I386 {
rp.Add += int64(rp.Off) + int64(rp.Siz)
}
if rel.extrn == 0 {
if rel.symnum < 1 || rel.symnum > c.seg.nsect {
err = fmt.Errorf("invalid relocation: section reference out of range %d vs %d", rel.symnum, c.seg.nsect)
goto bad
}
rp.Sym = c.seg.sect[rel.symnum-1].sym
if rp.Sym == nil {
err = fmt.Errorf("invalid relocation: %s", c.seg.sect[rel.symnum-1].name)
goto bad
}
// References to symbols in other sections
// include that information in the addend.
// We only care about the delta from the
// section base.
if SysArch.Family == sys.I386 {
rp.Add -= int64(c.seg.sect[rel.symnum-1].addr)
}
} else {
if rel.symnum >= symtab.nsym {
err = fmt.Errorf("invalid relocation: symbol reference out of range")
goto bad
}
rp.Sym = symtab.sym[rel.symnum].sym
}
rpi++
}
sort.Sort(rbyoff(r[:rpi]))
s.R = r
s.R = s.R[:rpi]
}
return
bad:
Errorf(nil, "%s: malformed mach-o file: %v", pn, err)
}
func ldelf(ctxt *Link, f *bio.Reader, pkg string, length int64, pn string) {
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f ldelf %s\n", obj.Cputime(), pn)
}
localSymVersion := ctxt.Syms.IncVersion()
base := f.Offset()
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 *Symbol
var sect *ElfSect
var sym ElfSym
var symbols []*Symbol
if _, err := io.ReadFull(f, hdrbuf[:]); err != nil {
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 = 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 {
Errorf(nil, "%s: elf but not elf relocatable object", pn)
return
}
switch SysArch.Family {
default:
Errorf(nil, "%s: elf %s unimplemented", pn, SysArch.Name)
return
case sys.MIPS64:
if elfobj.machine != ElfMachMips || hdr.Ident[4] != ElfClass64 {
Errorf(nil, "%s: elf object but not mips64", pn)
return
}
case sys.ARM:
if e != binary.LittleEndian || elfobj.machine != ElfMachArm || hdr.Ident[4] != ElfClass32 {
Errorf(nil, "%s: elf object but not arm", pn)
return
}
case sys.AMD64:
if e != binary.LittleEndian || elfobj.machine != ElfMachAmd64 || hdr.Ident[4] != ElfClass64 {
Errorf(nil, "%s: elf object but not amd64", pn)
return
}
case sys.ARM64:
if e != binary.LittleEndian || elfobj.machine != ElfMachArm64 || hdr.Ident[4] != ElfClass64 {
Errorf(nil, "%s: elf object but not arm64", pn)
return
}
case sys.I386:
if e != binary.LittleEndian || elfobj.machine != ElfMach386 || hdr.Ident[4] != ElfClass32 {
Errorf(nil, "%s: elf object but not 386", pn)
return
}
case sys.PPC64:
if elfobj.machine != ElfMachPower64 || hdr.Ident[4] != ElfClass64 {
Errorf(nil, "%s: elf object but not ppc64", pn)
return
}
case sys.S390X:
if elfobj.machine != ElfMachS390 || hdr.Ident[4] != ElfClass64 {
Errorf(nil, "%s: elf object but not s390x", 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 f.Seek(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 = 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 = 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) {
Errorf(nil, "%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_ == SHT_ARM_ATTRIBUTES && sect.name == ".ARM.attributes" {
if err = elfmap(elfobj, sect); err != nil {
goto bad
}
parseArmAttributes(ctxt, e, sect.base[:sect.size])
}
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 = ctxt.Syms.Lookup(name, localSymVersion)
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([]*Symbol, elfobj.nsymtab)
for i := 1; i < elfobj.nsymtab; i++ {
if err = readelfsym(ctxt, elfobj, i, &sym, 1, localSymVersion); 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]
if sect.sym == nil {
if strings.HasPrefix(sym.name, ".Linfo_string") { // clang does this
continue
}
if sym.name == "" && sym.type_ == 0 && sect.name == ".debug_str" {
// This reportedly happens with clang 3.7 on ARM.
// See issue 13139.
continue
}
if strings.HasPrefix(sym.name, ".LASF") { // gcc on s390x does this
continue
}
Errorf(sym.sym, "%s: sym#%d: ignoring symbol in section %d (type %d)", pn, i, sym.shndx, sym.type_)
continue
}
s = sym.sym
if s.Outer != nil {
if s.Attr.DuplicateOK() {
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.Attr.CgoExportDynamic() {
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.Attr.External() && !s.Attr.DuplicateOK() {
Errorf(s, "%s: duplicate symbol definition", pn)
}
s.Attr |= AttrExternal
}
if elfobj.machine == ElfMachPower64 {
flag = int(sym.other) >> 5
if 2 <= flag && flag <= 6 {
s.Localentry = 1 << uint(flag-2)
} else if flag == 7 {
Errorf(s, "%s: invalid sym.other 0x%x", pn, sym.other)
}
}
}
// 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)
}
if s.Type == obj.STEXT {
if s.Attr.OnList() {
log.Fatalf("symbol %s listed multiple times", s.Name)
}
s.Attr |= AttrOnList
ctxt.Textp = append(ctxt.Textp, s)
for s = s.Sub; s != nil; s = s.Sub {
if s.Attr.OnList() {
log.Fatalf("symbol %s listed multiple times", s.Name)
}
s.Attr |= AttrOnList
ctxt.Textp = append(ctxt.Textp, 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(ctxt, elfobj, int(info>>32), &sym, 0, 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 = 256 + obj.RelocType(info)
rp.Siz = relSize(ctxt, pn, uint32(info))
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 {
Errorf(nil, "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:
Errorf(nil, "%s: malformed elf file: %v", pn, err)
}
// parseObject parses a single Go object file.
// The prefix is the bytes already read from the file,
// typically in order to detect that this is an object file.
// The object file consists of a textual header ending in "\n!\n"
// and then the part we want to parse begins.
// The format of that part is defined in a comment at the top
// of src/liblink/objfile.c.
func (r *objReader) parseObject(prefix []byte) error {
r.p.MaxVersion++
h := make([]byte, 0, 256)
h = append(h, prefix...)
var c1, c2, c3 byte
for {
c1, c2, c3 = c2, c3, r.readByte()
h = append(h, c3)
// The new export format can contain 0 bytes.
// Don't consider them errors, only look for r.err != nil.
if r.err != nil {
return errCorruptObject
}
if c1 == '\n' && c2 == '!' && c3 == '\n' {
break
}
}
hs := strings.Fields(string(h))
if len(hs) >= 4 {
r.p.Arch = hs[3]
}
// TODO: extract OS + build ID if/when we need it
r.readFull(r.tmp[:8])
if !bytes.Equal(r.tmp[:8], []byte("\x00\x00go17ld")) {
return r.error(errCorruptObject)
}
b := r.readByte()
if b != 1 {
return r.error(errCorruptObject)
}
// Direct package dependencies.
for {
s := r.readString()
if s == "" {
break
}
r.p.Imports = append(r.p.Imports, s)
}
r.p.SymRefs = []SymID{{"", 0}}
for {
if b := r.readByte(); b != 0xfe {
if b != 0xff {
return r.error(errCorruptObject)
}
break
}
r.readRef()
}
dataLength := r.readInt()
r.readInt() // n relocations - ignore
r.readInt() // n pcdata - ignore
r.readInt() // n autom - ignore
r.readInt() // n funcdata - ignore
r.readInt() // n files - ignore
r.dataOffset = r.offset
r.skip(int64(dataLength))
// Symbols.
for {
if b := r.readByte(); b != 0xfe {
if b != 0xff {
return r.error(errCorruptObject)
}
break
}
typ := r.readInt()
s := &Sym{SymID: r.readSymID()}
r.p.Syms = append(r.p.Syms, s)
s.Kind = SymKind(typ)
flags := r.readInt()
s.DupOK = flags&1 != 0
s.Size = r.readInt()
s.Type = r.readSymID()
s.Data = r.readData()
s.Reloc = make([]Reloc, r.readInt())
for i := range s.Reloc {
rel := &s.Reloc[i]
rel.Offset = r.readInt()
rel.Size = r.readInt()
rel.Type = obj.RelocType(r.readInt())
rel.Add = r.readInt()
rel.Sym = r.readSymID()
}
if s.Kind == STEXT {
f := new(Func)
s.Func = f
f.Args = r.readInt()
f.Frame = r.readInt()
flags := r.readInt()
f.Leaf = flags&1 != 0
f.NoSplit = r.readInt() != 0
f.Var = make([]Var, r.readInt())
for i := range f.Var {
v := &f.Var[i]
v.Name = r.readSymID().Name
v.Offset = r.readInt()
v.Kind = r.readInt()
v.Type = r.readSymID()
}
f.PCSP = r.readData()
f.PCFile = r.readData()
f.PCLine = r.readData()
f.PCData = make([]Data, r.readInt())
for i := range f.PCData {
f.PCData[i] = r.readData()
}
f.FuncData = make([]FuncData, r.readInt())
for i := range f.FuncData {
f.FuncData[i].Sym = r.readSymID()
}
for i := range f.FuncData {
f.FuncData[i].Offset = int64(r.readInt()) // TODO
}
f.File = make([]string, r.readInt())
for i := range f.File {
f.File[i] = r.readSymID().Name
}
}
}
r.readFull(r.tmp[:7])
if !bytes.Equal(r.tmp[:7], []byte("\xffgo17ld")) {
return r.error(errCorruptObject)
}
return nil
}
