// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ld
import (
"cmd/internal/obj"
"sort"
"strings"
)
type MachoHdr struct {
cpu uint32
subcpu uint32
}
type MachoSect struct {
name string
segname string
addr uint64
size uint64
off uint32
align uint32
reloc uint32
nreloc uint32
flag uint32
res1 uint32
res2 uint32
}
type MachoSeg struct {
name string
vsize uint64
vaddr uint64
fileoffset uint64
filesize uint64
prot1 uint32
prot2 uint32
nsect uint32
msect uint32
sect []MachoSect
flag uint32
}
type MachoLoad struct {
type_ uint32
data []uint32
}
/*
* Total amount of space to reserve at the start of the file
* for Header, PHeaders, and SHeaders.
* May waste some.
*/
const (
INITIAL_MACHO_HEADR = 4 * 1024
)
const (
MACHO_CPU_AMD64 = 1<<24 | 7
MACHO_CPU_386 = 7
MACHO_SUBCPU_X86 = 3
MACHO_CPU_ARM = 12
MACHO_SUBCPU_ARM = 0
MACHO_SUBCPU_ARMV7 = 9
MACHO_CPU_ARM64 = 1<<24 | 12
MACHO_SUBCPU_ARM64_ALL = 0
MACHO32SYMSIZE = 12
MACHO64SYMSIZE = 16
MACHO_X86_64_RELOC_UNSIGNED = 0
MACHO_X86_64_RELOC_SIGNED = 1
MACHO_X86_64_RELOC_BRANCH = 2
MACHO_X86_64_RELOC_GOT_LOAD = 3
MACHO_X86_64_RELOC_GOT = 4
MACHO_X86_64_RELOC_SUBTRACTOR = 5
MACHO_X86_64_RELOC_SIGNED_1 = 6
MACHO_X86_64_RELOC_SIGNED_2 = 7
MACHO_X86_64_RELOC_SIGNED_4 = 8
MACHO_ARM_RELOC_VANILLA = 0
MACHO_ARM_RELOC_BR24 = 5
MACHO_ARM64_RELOC_UNSIGNED = 0
MACHO_ARM64_RELOC_BRANCH26 = 2
MACHO_ARM64_RELOC_PAGE21 = 3
MACHO_ARM64_RELOC_PAGEOFF12 = 4
MACHO_ARM64_RELOC_ADDEND = 10
MACHO_GENERIC_RELOC_VANILLA = 0
MACHO_FAKE_GOTPCREL = 100
)
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Mach-O file writing
// http://developer.apple.com/mac/library/DOCUMENTATION/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html
var macho64 bool
var machohdr MachoHdr
var load []MachoLoad
var seg [16]MachoSeg
var nseg int
var ndebug int
var nsect int
const (
SymKindLocal = 0 + iota
SymKindExtdef
SymKindUndef
NumSymKind
)
var nkind [NumSymKind]int
var sortsym []*LSym
var nsortsym int
// Amount of space left for adding load commands
// that refer to dynamic libraries. Because these have
// to go in the Mach-O header, we can't just pick a
// "big enough" header size. The initial header is
// one page, the non-dynamic library stuff takes
// up about 1300 bytes; we overestimate that as 2k.
var load_budget int = INITIAL_MACHO_HEADR - 2*1024
func Machoinit() {
switch Thearch.Thechar {
// 64-bit architectures
case '6', '7', '9':
macho64 = true
// 32-bit architectures
default:
break
}
}
func getMachoHdr() *MachoHdr {
return &machohdr
}
func newMachoLoad(type_ uint32, ndata uint32) *MachoLoad {
if macho64 && (ndata&1 != 0) {
ndata++
}
load = append(load, MachoLoad{})
l := &load[len(load)-1]
l.type_ = type_
l.data = make([]uint32, ndata)
return l
}
func newMachoSeg(name string, msect int) *MachoSeg {
if nseg >= len(seg) {
Exitf("too many segs")
}
s := &seg[nseg]
nseg++
s.name = name
s.msect = uint32(msect)
s.sect = make([]MachoSect, msect)
return s
}
func newMachoSect(seg *MachoSeg, name string, segname string) *MachoSect {
if seg.nsect >= seg.msect {
Exitf("too many sects in segment %s", seg.name)
}
s := &seg.sect[seg.nsect]
seg.nsect++
s.name = name
s.segname = segname
nsect++
return s
}
// Generic linking code.
var dylib []string
var linkoff int64
func machowrite() int {
o1 := Cpos()
loadsize := 4 * 4 * ndebug
for i := 0; i < len(load); i++ {
loadsize += 4 * (len(load[i].data) + 2)
}
if macho64 {
loadsize += 18 * 4 * nseg
loadsize += 20 * 4 * nsect
} else {
loadsize += 14 * 4 * nseg
loadsize += 17 * 4 * nsect
}
if macho64 {
Thearch.Lput(0xfeedfacf)
} else {
Thearch.Lput(0xfeedface)
}
Thearch.Lput(machohdr.cpu)
Thearch.Lput(machohdr.subcpu)
if Linkmode == LinkExternal {
Thearch.Lput(1) /* file type - mach object */
} else {
Thearch.Lput(2) /* file type - mach executable */
}
Thearch.Lput(uint32(len(load)) + uint32(nseg) + uint32(ndebug))
Thearch.Lput(uint32(loadsize))
Thearch.Lput(1) /* flags - no undefines */
if macho64 {
Thearch.Lput(0) /* reserved */
}
var j int
var s *MachoSeg
var t *MachoSect
for i := 0; i < nseg; i++ {
s = &seg[i]
if macho64 {
Thearch.Lput(25) /* segment 64 */
Thearch.Lput(72 + 80*s.nsect)
strnput(s.name, 16)
Thearch.Vput(s.vaddr)
Thearch.Vput(s.vsize)
Thearch.Vput(s.fileoffset)
Thearch.Vput(s.filesize)
Thearch.Lput(s.prot1)
Thearch.Lput(s.prot2)
Thearch.Lput(s.nsect)
Thearch.Lput(s.flag)
} else {
Thearch.Lput(1) /* segment 32 */
Thearch.Lput(56 + 68*s.nsect)
strnput(s.name, 16)
Thearch.Lput(uint32(s.vaddr))
Thearch.Lput(uint32(s.vsize))
Thearch.Lput(uint32(s.fileoffset))
Thearch.Lput(uint32(s.filesize))
Thearch.Lput(s.prot1)
Thearch.Lput(s.prot2)
Thearch.Lput(s.nsect)
Thearch.Lput(s.flag)
}
for j = 0; uint32(j) < s.nsect; j++ {
t = &s.sect[j]
if macho64 {
strnput(t.name, 16)
strnput(t.segname, 16)
Thearch.Vput(t.addr)
Thearch.Vput(t.size)
Thearch.Lput(t.off)
Thearch.Lput(t.align)
Thearch.Lput(t.reloc)
Thearch.Lput(t.nreloc)
Thearch.Lput(t.flag)
Thearch.Lput(t.res1) /* reserved */
Thearch.Lput(t.res2) /* reserved */
Thearch.Lput(0) /* reserved */
} else {
strnput(t.name, 16)
strnput(t.segname, 16)
Thearch.Lput(uint32(t.addr))
Thearch.Lput(uint32(t.size))
Thearch.Lput(t.off)
Thearch.Lput(t.align)
Thearch.Lput(t.reloc)
Thearch.Lput(t.nreloc)
Thearch.Lput(t.flag)
Thearch.Lput(t.res1) /* reserved */
Thearch.Lput(t.res2) /* reserved */
}
}
}
var l *MachoLoad
for i := 0; i < len(load); i++ {
l = &load[i]
Thearch.Lput(l.type_)
Thearch.Lput(4 * (uint32(len(l.data)) + 2))
for j = 0; j < len(l.data); j++ {
Thearch.Lput(l.data[j])
}
}
return int(Cpos() - o1)
}
func domacho() {
if Debug['d'] != 0 {
return
}
// empirically, string table must begin with " \x00".
s := Linklookup(Ctxt, ".machosymstr", 0)
s.Type = obj.SMACHOSYMSTR
s.Reachable = true
Adduint8(Ctxt, s, ' ')
Adduint8(Ctxt, s, '\x00')
s = Linklookup(Ctxt, ".machosymtab", 0)
s.Type = obj.SMACHOSYMTAB
s.Reachable = true
if Linkmode != LinkExternal {
s := Linklookup(Ctxt, ".plt", 0) // will be __symbol_stub
s.Type = obj.SMACHOPLT
s.Reachable = true
s = Linklookup(Ctxt, ".got", 0) // will be __nl_symbol_ptr
s.Type = obj.SMACHOGOT
s.Reachable = true
s.Align = 4
s = Linklookup(Ctxt, ".linkedit.plt", 0) // indirect table for .plt
s.Type = obj.SMACHOINDIRECTPLT
s.Reachable = true
s = Linklookup(Ctxt, ".linkedit.got", 0) // indirect table for .got
s.Type = obj.SMACHOINDIRECTGOT
s.Reachable = true
}
}
func Machoadddynlib(lib string) {
// Will need to store the library name rounded up
// and 24 bytes of header metadata. If not enough
// space, grab another page of initial space at the
// beginning of the output file.
load_budget -= (len(lib)+7)/8*8 + 24
if load_budget < 0 {
HEADR += 4096
INITTEXT += 4096
load_budget += 4096
}
dylib = append(dylib, lib)
}
func machoshbits(mseg *MachoSeg, sect *Section, segname string) {
buf := "__" + strings.Replace(sect.Name[1:], ".", "_", -1)
var msect *MachoSect
if sect.Rwx&1 == 0 && (Thearch.Thechar == '7' || (Thearch.Thechar == '6' && Buildmode == BuildmodeCShared)) {
// Darwin external linker on arm64 and on amd64 in c-shared buildmode
// complains about absolute relocs in __TEXT, so if the section is not
// executable, put it in __DATA segment.
msect = newMachoSect(mseg, buf, "__DATA")
} else {
msect = newMachoSect(mseg, buf, segname)
}
if sect.Rellen > 0 {
msect.reloc = uint32(sect.Reloff)
msect.nreloc = uint32(sect.Rellen / 8)
}
for 1<<msect.align < sect.Align {
msect.align++
}
msect.addr = sect.Vaddr
msect.size = sect.Length
if sect.Vaddr < sect.Seg.Vaddr+sect.Seg.Filelen {
// data in file
if sect.Length > sect.Seg.Vaddr+sect.Seg.Filelen-sect.Vaddr {
Diag("macho cannot represent section %s crossing data and bss", sect.Name)
}
msect.off = uint32(sect.Seg.Fileoff + sect.Vaddr - sect.Seg.Vaddr)
} else {
// zero fill
msect.off = 0
msect.flag |= 1
}
if sect.Rwx&1 != 0 {
msect.flag |= 0x400 /* has instructions */
}
if sect.Name == ".plt" {
msect.name = "__symbol_stub1"
msect.flag = 0x80000408 /* only instructions, code, symbol stubs */
msect.res1 = 0 //nkind[SymKindLocal];
msect.res2 = 6
}
if sect.Name == ".got" {
msect.name = "__nl_symbol_ptr"
msect.flag = 6 /* section with nonlazy symbol pointers */
msect.res1 = uint32(Linklookup(Ctxt, ".linkedit.plt", 0).Size / 4) /* offset into indirect symbol table */
}
if sect.Name == ".init_array" {
msect.name = "__mod_init_func"
msect.flag = 9 // S_MOD_INIT_FUNC_POINTERS
}
}
func Asmbmacho() {
/* apple MACH */
va := INITTEXT - int64(HEADR)
mh := getMachoHdr()
switch Thearch.Thechar {
default:
Exitf("unknown macho architecture: %v", Thearch.Thechar)
case '5':
mh.cpu = MACHO_CPU_ARM
mh.subcpu = MACHO_SUBCPU_ARMV7
case '6':
mh.cpu = MACHO_CPU_AMD64
mh.subcpu = MACHO_SUBCPU_X86
case '7':
mh.cpu = MACHO_CPU_ARM64
mh.subcpu = MACHO_SUBCPU_ARM64_ALL
case '8':
mh.cpu = MACHO_CPU_386
mh.subcpu = MACHO_SUBCPU_X86
}
var ms *MachoSeg
if Linkmode == LinkExternal {
/* segment for entire file */
ms = newMachoSeg("", 40)
ms.fileoffset = Segtext.Fileoff
if Thearch.Thechar == '5' {
ms.filesize = Segdata.Fileoff + Segdata.Filelen - Segtext.Fileoff
} else {
ms.filesize = Segdwarf.Fileoff + Segdwarf.Filelen - Segtext.Fileoff
ms.vsize = ms.filesize
}
}
/* segment for zero page */
if Linkmode != LinkExternal {
ms = newMachoSeg("__PAGEZERO", 0)
ms.vsize = uint64(va)
}
/* text */
v := Rnd(int64(uint64(HEADR)+Segtext.Length), int64(INITRND))
if Linkmode != LinkExternal {
ms = newMachoSeg("__TEXT", 20)
ms.vaddr = uint64(va)
ms.vsize = uint64(v)
ms.fileoffset = 0
ms.filesize = uint64(v)
ms.prot1 = 7
ms.prot2 = 5
}
for sect := Segtext.Sect; sect != nil; sect = sect.Next {
machoshbits(ms, sect, "__TEXT")
}
/* data */
if Linkmode != LinkExternal {
w := int64(Segdata.Length)
ms = newMachoSeg("__DATA", 20)
ms.vaddr = uint64(va) + uint64(v)
ms.vsize = uint64(w)
ms.fileoffset = uint64(v)
ms.filesize = Segdata.Filelen
ms.prot1 = 3
ms.prot2 = 3
}
for sect := Segdata.Sect; sect != nil; sect = sect.Next {
machoshbits(ms, sect, "__DATA")
}
if Linkmode != LinkExternal {
switch Thearch.Thechar {
default:
Exitf("unknown macho architecture: %v", Thearch.Thechar)
case '5':
ml := newMachoLoad(5, 17+2) /* unix thread */
ml.data[0] = 1 /* thread type */
ml.data[1] = 17 /* word count */
ml.data[2+15] = uint32(Entryvalue()) /* start pc */
case '6':
ml := newMachoLoad(5, 42+2) /* unix thread */
ml.data[0] = 4 /* thread type */
ml.data[1] = 42 /* word count */
ml.data[2+32] = uint32(Entryvalue()) /* start pc */
ml.data[2+32+1] = uint32(Entryvalue() >> 32)
case '7':
ml := newMachoLoad(5, 68+2) /* unix thread */
ml.data[0] = 6 /* thread type */
ml.data[1] = 68 /* word count */
ml.data[2+64] = uint32(Entryvalue()) /* start pc */
ml.data[2+64+1] = uint32(Entryvalue() >> 32)
case '8':
ml := newMachoLoad(5, 16+2) /* unix thread */
ml.data[0] = 1 /* thread type */
ml.data[1] = 16 /* word count */
ml.data[2+10] = uint32(Entryvalue()) /* start pc */
}
}
if Debug['d'] == 0 {
// must match domacholink below
s1 := Linklookup(Ctxt, ".machosymtab", 0)
s2 := Linklookup(Ctxt, ".linkedit.plt", 0)
s3 := Linklookup(Ctxt, ".linkedit.got", 0)
s4 := Linklookup(Ctxt, ".machosymstr", 0)
if Linkmode != LinkExternal {
ms := newMachoSeg("__LINKEDIT", 0)
ms.vaddr = uint64(va) + uint64(v) + uint64(Rnd(int64(Segdata.Length), int64(INITRND)))
ms.vsize = uint64(s1.Size) + uint64(s2.Size) + uint64(s3.Size) + uint64(s4.Size)
ms.fileoffset = uint64(linkoff)
ms.filesize = ms.vsize
ms.prot1 = 7
ms.prot2 = 3
}
ml := newMachoLoad(2, 4) /* LC_SYMTAB */
ml.data[0] = uint32(linkoff) /* symoff */
ml.data[1] = uint32(nsortsym) /* nsyms */
ml.data[2] = uint32(linkoff + s1.Size + s2.Size + s3.Size) /* stroff */
ml.data[3] = uint32(s4.Size) /* strsize */
machodysymtab()
if Linkmode != LinkExternal {
ml := newMachoLoad(14, 6) /* LC_LOAD_DYLINKER */
ml.data[0] = 12 /* offset to string */
stringtouint32(ml.data[1:], "/usr/lib/dyld")
for i := 0; i < len(dylib); i++ {
ml = newMachoLoad(12, 4+(uint32(len(dylib[i]))+1+7)/8*2) /* LC_LOAD_DYLIB */
ml.data[0] = 24 /* offset of string from beginning of load */
ml.data[1] = 0 /* time stamp */
ml.data[2] = 0 /* version */
ml.data[3] = 0 /* compatibility version */
stringtouint32(ml.data[4:], dylib[i])
}
}
}
// TODO: dwarf headers go in ms too
if Debug['s'] == 0 {
dwarfaddmachoheaders(ms)
}
a := machowrite()
if int32(a) > HEADR {
Exitf("HEADR too small: %d > %d", a, HEADR)
}
}
func symkind(s *LSym) int {
if s.Type == obj.SDYNIMPORT {
return SymKindUndef
}
if s.Cgoexport != 0 {
return SymKindExtdef
}
return SymKindLocal
}
func addsym(s *LSym, name string, type_ int, addr int64, size int64, ver int, gotype *LSym) {
if s == nil {
return
}
switch type_ {
default:
return
case 'D', 'B', 'T':
break
}
if sortsym != nil {
sortsym[nsortsym] = s
nkind[symkind(s)]++
}
nsortsym++
}
type machoscmp []*LSym
func (x machoscmp) Len() int {
return len(x)
}
func (x machoscmp) Swap(i, j int) {
x[i], x[j] = x[j], x[i]
}
func (x machoscmp) Less(i, j int) bool {
s1 := x[i]
s2 := x[j]
k1 := symkind(s1)
k2 := symkind(s2)
if k1 != k2 {
return k1-k2 < 0
}
return stringsCompare(s1.Extname, s2.Extname) < 0
}
func machogenasmsym(put func(*LSym, string, int, int64, int64, int, *LSym)) {
genasmsym(put)
for s := Ctxt.Allsym; s != nil; s = s.Allsym {
if s.Type == obj.SDYNIMPORT || s.Type == obj.SHOSTOBJ {
if s.Reachable {
put(s, "", 'D', 0, 0, 0, nil)
}
}
}
}
func machosymorder() {
// On Mac OS X Mountain Lion, we must sort exported symbols
// So we sort them here and pre-allocate dynid for them
// See https://golang.org/issue/4029
for i := 0; i < len(dynexp); i++ {
dynexp[i].Reachable = true
}
machogenasmsym(addsym)
sortsym = make([]*LSym, nsortsym)
nsortsym = 0
machogenasmsym(addsym)
sort.Sort(machoscmp(sortsym[:nsortsym]))
for i := 0; i < nsortsym; i++ {
sortsym[i].Dynid = int32(i)
}
}
func machosymtab() {
var s *LSym
var o *LSym
var p string
symtab := Linklookup(Ctxt, ".machosymtab", 0)
symstr := Linklookup(Ctxt, ".machosymstr", 0)
for i := 0; i < nsortsym; i++ {
s = sortsym[i]
Adduint32(Ctxt, symtab, uint32(symstr.Size))
// Only add _ to C symbols. Go symbols have dot in the name.
if !strings.Contains(s.Extname, ".") {
Adduint8(Ctxt, symstr, '_')
}
// replace "·" as ".", because DTrace cannot handle it.
if !strings.Contains(s.Extname, "·") {
Addstring(symstr, s.Extname)
} else {
for p = s.Extname; p != ""; p = p[1:] {
if uint8(p[0]) == 0xc2 && uint8((p[1:])[0]) == 0xb7 {
Adduint8(Ctxt, symstr, '.')
p = p[1:]
} else {
Adduint8(Ctxt, symstr, uint8(p[0]))
}
}
Adduint8(Ctxt, symstr, '\x00')
}
if s.Type == obj.SDYNIMPORT || s.Type == obj.SHOSTOBJ {
Adduint8(Ctxt, symtab, 0x01) // type N_EXT, external symbol
Adduint8(Ctxt, symtab, 0) // no section
Adduint16(Ctxt, symtab, 0) // desc
adduintxx(Ctxt, symtab, 0, Thearch.Ptrsize) // no value
} else {
if s.Cgoexport != 0 {
Adduint8(Ctxt, symtab, 0x0f)
} else {
Adduint8(Ctxt, symtab, 0x0e)
}
o = s
for o.Outer != nil {
o = o.Outer
}
if o.Sect == nil {
Diag("missing section for %s", s.Name)
Adduint8(Ctxt, symtab, 0)
} else {
Adduint8(Ctxt, symtab, uint8(o.Sect.Extnum))
}
Adduint16(Ctxt, symtab, 0) // desc
adduintxx(Ctxt, symtab, uint64(Symaddr(s)), Thearch.Ptrsize)
}
}
}
func machodysymtab() {
ml := newMachoLoad(11, 18) /* LC_DYSYMTAB */
n := 0
ml.data[0] = uint32(n) /* ilocalsym */
ml.data[1] = uint32(nkind[SymKindLocal]) /* nlocalsym */
n += nkind[SymKindLocal]
ml.data[2] = uint32(n) /* iextdefsym */
ml.data[3] = uint32(nkind[SymKindExtdef]) /* nextdefsym */
n += nkind[SymKindExtdef]
ml.data[4] = uint32(n) /* iundefsym */
ml.data[5] = uint32(nkind[SymKindUndef]) /* nundefsym */
ml.data[6] = 0 /* tocoffset */
ml.data[7] = 0 /* ntoc */
ml.data[8] = 0 /* modtaboff */
ml.data[9] = 0 /* nmodtab */
ml.data[10] = 0 /* extrefsymoff */
ml.data[11] = 0 /* nextrefsyms */
// must match domacholink below
s1 := Linklookup(Ctxt, ".machosymtab", 0)
s2 := Linklookup(Ctxt, ".linkedit.plt", 0)
s3 := Linklookup(Ctxt, ".linkedit.got", 0)
ml.data[12] = uint32(linkoff + s1.Size) /* indirectsymoff */
ml.data[13] = uint32((s2.Size + s3.Size) / 4) /* nindirectsyms */
ml.data[14] = 0 /* extreloff */
ml.data[15] = 0 /* nextrel */
ml.data[16] = 0 /* locreloff */
ml.data[17] = 0 /* nlocrel */
}
func Domacholink() int64 {
machosymtab()
// write data that will be linkedit section
s1 := Linklookup(Ctxt, ".machosymtab", 0)
s2 := Linklookup(Ctxt, ".linkedit.plt", 0)
s3 := Linklookup(Ctxt, ".linkedit.got", 0)
s4 := Linklookup(Ctxt, ".machosymstr", 0)
// Force the linkedit section to end on a 16-byte
// boundary. This allows pure (non-cgo) Go binaries
// to be code signed correctly.
//
// Apple's codesign_allocate (a helper utility for
// the codesign utility) can do this fine itself if
// it is run on a dynamic Mach-O binary. However,
// when it is run on a pure (non-cgo) Go binary, where
// the linkedit section is mostly empty, it fails to
// account for the extra padding that it itself adds
// when adding the LC_CODE_SIGNATURE load command
// (which must be aligned on a 16-byte boundary).
//
// By forcing the linkedit section to end on a 16-byte
// boundary, codesign_allocate will not need to apply
// any alignment padding itself, working around the
// issue.
for s4.Size%16 != 0 {
Adduint8(Ctxt, s4, 0)
}
size := int(s1.Size + s2.Size + s3.Size + s4.Size)
if size > 0 {
linkoff = Rnd(int64(uint64(HEADR)+Segtext.Length), int64(INITRND)) + Rnd(int64(Segdata.Filelen), int64(INITRND)) + Rnd(int64(Segdwarf.Filelen), int64(INITRND))
Cseek(linkoff)
Cwrite(s1.P[:s1.Size])
Cwrite(s2.P[:s2.Size])
Cwrite(s3.P[:s3.Size])
Cwrite(s4.P[:s4.Size])
}
return Rnd(int64(size), int64(INITRND))
}
func machorelocsect(sect *Section, first *LSym) {
// If main section has no bits, nothing to relocate.
if sect.Vaddr >= sect.Seg.Vaddr+sect.Seg.Filelen {
return
}
sect.Reloff = uint64(Cpos())
var sym *LSym
for sym = first; sym != nil; sym = sym.Next {
if !sym.Reachable {
continue
}
if uint64(sym.Value) >= sect.Vaddr {
break
}
}
eaddr := int32(sect.Vaddr + sect.Length)
var r *Reloc
var ri int
for ; sym != nil; sym = sym.Next {
if !sym.Reachable {
continue
}
if sym.Value >= int64(eaddr) {
break
}
Ctxt.Cursym = sym
for ri = 0; ri < len(sym.R); ri++ {
r = &sym.R[ri]
if r.Done != 0 {
continue
}
if Thearch.Machoreloc1(r, int64(uint64(sym.Value+int64(r.Off))-sect.Vaddr)) < 0 {
Diag("unsupported obj reloc %d/%d to %s", r.Type, r.Siz, r.Sym.Name)
}
}
}
sect.Rellen = uint64(Cpos()) - sect.Reloff
}
func Machoemitreloc() {
for Cpos()&7 != 0 {
Cput(0)
}
machorelocsect(Segtext.Sect, Ctxt.Textp)
for sect := Segtext.Sect.Next; sect != nil; sect = sect.Next {
machorelocsect(sect, datap)
}
for sect := Segdata.Sect; sect != nil; sect = sect.Next {
machorelocsect(sect, datap)
}
dwarfemitreloc()
}