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Diffstat (limited to 'src/cmd/link/internal/ld/lib.go')
-rw-r--r--src/cmd/link/internal/ld/lib.go55
1 files changed, 37 insertions, 18 deletions
diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index f5d41a0b4a..73e0b35bc0 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -247,12 +247,16 @@ type Arch struct {
Elfreloc1 func(*Link, *OutBuf, *loader.Loader, loader.Sym, loader.ExtReloc, int, int64) bool
ElfrelocSize uint32 // size of an ELF relocation record, must match Elfreloc1.
Elfsetupplt func(ctxt *Link, plt, gotplt *loader.SymbolBuilder, dynamic loader.Sym)
- Gentext func(*Link, *loader.Loader)
+ Gentext func(*Link, *loader.Loader) // Generate text before addressing has been performed.
Machoreloc1 func(*sys.Arch, *OutBuf, *loader.Loader, loader.Sym, loader.ExtReloc, int64) bool
MachorelocSize uint32 // size of an Mach-O relocation record, must match Machoreloc1.
PEreloc1 func(*sys.Arch, *OutBuf, *loader.Loader, loader.Sym, loader.ExtReloc, int64) bool
Xcoffreloc1 func(*sys.Arch, *OutBuf, *loader.Loader, loader.Sym, loader.ExtReloc, int64) bool
+ // Generate additional symbols for the native symbol table just prior to
+ // code generation.
+ GenSymsLate func(*Link, *loader.Loader)
+
// TLSIEtoLE converts a TLS Initial Executable relocation to
// a TLS Local Executable relocation.
//
@@ -1254,7 +1258,9 @@ func (ctxt *Link) hostlink() {
// -headerpad is incompatible with -fembed-bitcode.
argv = append(argv, "-Wl,-headerpad,1144")
}
- if ctxt.DynlinkingGo() && !ctxt.Arch.InFamily(sys.ARM, sys.ARM64) {
+ if ctxt.DynlinkingGo() && objabi.GOOS != "ios" {
+ // -flat_namespace is deprecated on iOS.
+ // It is useful for supporting plugins. We don't support plugins on iOS.
argv = append(argv, "-Wl,-flat_namespace")
}
if !combineDwarf {
@@ -1290,6 +1296,17 @@ func (ctxt *Link) hostlink() {
argv = append(argv, "-Wl,-bbigtoc")
}
+ // Enable ASLR on Windows.
+ addASLRargs := func(argv []string) []string {
+ // Enable ASLR.
+ argv = append(argv, "-Wl,--dynamicbase")
+ // enable high-entropy ASLR on 64-bit.
+ if ctxt.Arch.PtrSize >= 8 {
+ argv = append(argv, "-Wl,--high-entropy-va")
+ }
+ return argv
+ }
+
switch ctxt.BuildMode {
case BuildModeExe:
if ctxt.HeadType == objabi.Hdarwin {
@@ -1302,12 +1319,7 @@ func (ctxt *Link) hostlink() {
switch ctxt.HeadType {
case objabi.Hdarwin, objabi.Haix:
case objabi.Hwindows:
- // Enable ASLR.
- argv = append(argv, "-Wl,--dynamicbase")
- // enable high-entropy ASLR on 64-bit.
- if ctxt.Arch.PtrSize >= 8 {
- argv = append(argv, "-Wl,--high-entropy-va")
- }
+ argv = addASLRargs(argv)
// Work around binutils limitation that strips relocation table for dynamicbase.
// See https://sourceware.org/bugzilla/show_bug.cgi?id=19011
argv = append(argv, "-Wl,--export-all-symbols")
@@ -1321,9 +1333,6 @@ func (ctxt *Link) hostlink() {
case BuildModeCShared:
if ctxt.HeadType == objabi.Hdarwin {
argv = append(argv, "-dynamiclib")
- if ctxt.Arch.Family != sys.AMD64 {
- argv = append(argv, "-Wl,-read_only_relocs,suppress")
- }
} else {
// ELF.
argv = append(argv, "-Wl,-Bsymbolic")
@@ -1331,7 +1340,11 @@ func (ctxt *Link) hostlink() {
argv = append(argv, "-Wl,-z,relro")
}
argv = append(argv, "-shared")
- if ctxt.HeadType != objabi.Hwindows {
+ if ctxt.HeadType == objabi.Hwindows {
+ if *flagAslr {
+ argv = addASLRargs(argv)
+ }
+ } else {
// Pass -z nodelete to mark the shared library as
// non-closeable: a dlclose will do nothing.
argv = append(argv, "-Wl,-z,nodelete")
@@ -1601,12 +1614,12 @@ func (ctxt *Link) hostlink() {
if combineDwarf {
dsym := filepath.Join(*flagTmpdir, "go.dwarf")
- if out, err := exec.Command("dsymutil", "-f", *flagOutfile, "-o", dsym).CombinedOutput(); err != nil {
+ if out, err := exec.Command("xcrun", "dsymutil", "-f", *flagOutfile, "-o", dsym).CombinedOutput(); err != nil {
Exitf("%s: running dsymutil failed: %v\n%s", os.Args[0], err, out)
}
// Remove STAB (symbolic debugging) symbols after we are done with them (by dsymutil).
// They contain temporary file paths and make the build not reproducible.
- if out, err := exec.Command("strip", "-S", *flagOutfile).CombinedOutput(); err != nil {
+ if out, err := exec.Command("xcrun", "strip", "-S", *flagOutfile).CombinedOutput(); err != nil {
Exitf("%s: running strip failed: %v\n%s", os.Args[0], err, out)
}
// Skip combining if `dsymutil` didn't generate a file. See #11994.
@@ -1757,12 +1770,12 @@ func ldobj(ctxt *Link, f *bio.Reader, lib *sym.Library, length int64, pn string,
magic := uint32(c1)<<24 | uint32(c2)<<16 | uint32(c3)<<8 | uint32(c4)
if magic == 0x7f454c46 { // \x7F E L F
ldelf := func(ctxt *Link, f *bio.Reader, pkg string, length int64, pn string) {
- textp, flags, err := loadelf.Load(ctxt.loader, ctxt.Arch, ctxt.IncVersion(), f, pkg, length, pn, ehdr.flags)
+ textp, flags, err := loadelf.Load(ctxt.loader, ctxt.Arch, ctxt.IncVersion(), f, pkg, length, pn, ehdr.Flags)
if err != nil {
Errorf(nil, "%v", err)
return
}
- ehdr.flags = flags
+ ehdr.Flags = flags
ctxt.Textp = append(ctxt.Textp, textp...)
}
return ldhostobj(ldelf, ctxt.HeadType, f, pkg, length, pn, file)
@@ -2507,16 +2520,22 @@ func AddGotSym(target *Target, ldr *loader.Loader, syms *ArchSyms, s loader.Sym,
if target.Arch.PtrSize == 8 {
rela := ldr.MakeSymbolUpdater(syms.Rela)
rela.AddAddrPlus(target.Arch, got.Sym(), int64(ldr.SymGot(s)))
- rela.AddUint64(target.Arch, ELF64_R_INFO(uint32(ldr.SymDynid(s)), elfRelocTyp))
+ rela.AddUint64(target.Arch, elf.R_INFO(uint32(ldr.SymDynid(s)), elfRelocTyp))
rela.AddUint64(target.Arch, 0)
} else {
rel := ldr.MakeSymbolUpdater(syms.Rel)
rel.AddAddrPlus(target.Arch, got.Sym(), int64(ldr.SymGot(s)))
- rel.AddUint32(target.Arch, ELF32_R_INFO(uint32(ldr.SymDynid(s)), elfRelocTyp))
+ rel.AddUint32(target.Arch, elf.R_INFO32(uint32(ldr.SymDynid(s)), elfRelocTyp))
}
} else if target.IsDarwin() {
leg := ldr.MakeSymbolUpdater(syms.LinkEditGOT)
leg.AddUint32(target.Arch, uint32(ldr.SymDynid(s)))
+ if target.IsPIE() && target.IsInternal() {
+ // Mach-O relocations are a royal pain to lay out.
+ // They use a compact stateful bytecode representation.
+ // Here we record what are needed and encode them later.
+ MachoAddBind(int64(ldr.SymGot(s)), s)
+ }
} else {
ldr.Errorf(s, "addgotsym: unsupported binary format")
}
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