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cmd/link: prefer to use constants in macho.go

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We might want to replace some linker's feature by debug/macho in future.
This CL gathers information of required constants.

Change-Id: Iea14abdb32709a4f5404a17874f9c925d29ba999
Reviewed-on: https://go-review.googlesource.com/55252
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Hiroshi Ioka 2017-08-12 15:56:22 +09:00 committed by Ian Lance Taylor
parent 6424c40c22
commit 5b43bbe63b
2 changed files with 77 additions and 52 deletions
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108
src/cmd/link/internal/ld/macho.go
View File

@ -90,6 +90,56 @@ const (
MACHO_FAKE_GOTPCREL = 100
)
const (
MH_MAGIC = 0xfeedface
MH_MAGIC_64 = 0xfeedfacf
MH_OBJECT = 0x1
MH_EXECUTE = 0x2
MH_NOUNDEFS = 0x1
)
const (
LC_SEGMENT = 0x1
LC_SYMTAB = 0x2
LC_UNIXTHREAD = 0x5
LC_DYSYMTAB = 0xb
LC_LOAD_DYLIB = 0xc
LC_ID_DYLIB = 0xd
LC_LOAD_DYLINKER = 0xe
LC_PREBOUND_DYLIB = 0x10
LC_LOAD_WEAK_DYLIB = 0x18
LC_SEGMENT_64 = 0x19
LC_UUID = 0x1b
LC_RPATH = 0x8000001c
LC_CODE_SIGNATURE = 0x1d
LC_SEGMENT_SPLIT_INFO = 0x1e
LC_REEXPORT_DYLIB = 0x8000001f
LC_ENCRYPTION_INFO = 0x21
LC_DYLD_INFO = 0x22
LC_DYLD_INFO_ONLY = 0x80000022
LC_VERSION_MIN_MACOSX = 0x24
LC_VERSION_MIN_IPHONEOS = 0x25
LC_FUNCTION_STARTS = 0x26
LC_MAIN = 0x80000028
LC_DATA_IN_CODE = 0x29
LC_SOURCE_VERSION = 0x2A
LC_DYLIB_CODE_SIGN_DRS = 0x2B
LC_ENCRYPTION_INFO_64 = 0x2C
)
const (
S_REGULAR = 0x0
S_ZEROFILL = 0x1
S_NON_LAZY_SYMBOL_POINTERS = 0x6
S_SYMBOL_STUBS = 0x8
S_MOD_INIT_FUNC_POINTERS = 0x9
S_ATTR_PURE_INSTRUCTIONS = 0x80000000
S_ATTR_DEBUG = 0x02000000
S_ATTR_SOME_INSTRUCTIONS = 0x00000400
)
// 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.
@ -200,20 +250,20 @@ func machowrite() int {
}
if macho64 {
Thearch.Lput(0xfeedfacf)
Thearch.Lput(MH_MAGIC_64)
} else {
Thearch.Lput(0xfeedface)
Thearch.Lput(MH_MAGIC)
}
Thearch.Lput(machohdr.cpu)
Thearch.Lput(machohdr.subcpu)
if Linkmode == LinkExternal {
Thearch.Lput(1) /* file type - mach object */
Thearch.Lput(MH_OBJECT) /* file type - mach object */
} else {
Thearch.Lput(2) /* file type - mach executable */
Thearch.Lput(MH_EXECUTE) /* file type - mach executable */
}
Thearch.Lput(uint32(len(load)) + uint32(nseg) + uint32(ndebug))
Thearch.Lput(uint32(loadsize))
Thearch.Lput(1) /* flags - no undefines */
Thearch.Lput(MH_NOUNDEFS) /* flags - no undefines */
if macho64 {
Thearch.Lput(0) /* reserved */
}
@ -224,7 +274,7 @@ func machowrite() int {
for i := 0; i < nseg; i++ {
s = &seg[i]
if macho64 {
Thearch.Lput(25) /* segment 64 */
Thearch.Lput(LC_SEGMENT_64)
Thearch.Lput(72 + 80*s.nsect)
strnput(s.name, 16)
Thearch.Vput(s.vaddr)
@ -236,7 +286,7 @@ func machowrite() int {
Thearch.Lput(s.nsect)
Thearch.Lput(s.flag)
} else {
Thearch.Lput(1) /* segment 32 */
Thearch.Lput(LC_SEGMENT)
Thearch.Lput(56 + 68*s.nsect)
strnput(s.name, 16)
Thearch.Lput(uint32(s.vaddr))
@ -379,36 +429,34 @@ func machoshbits(ctxt *Link, mseg *MachoSeg, sect *Section, segname string) {
}
msect.off = uint32(sect.Seg.Fileoff + sect.Vaddr - sect.Seg.Vaddr)
} else {
// zero fill
msect.off = 0
msect.flag |= 1
msect.flag |= S_ZEROFILL
}
if sect.Rwx&1 != 0 {
msect.flag |= 0x400 /* has instructions */
msect.flag |= S_ATTR_SOME_INSTRUCTIONS
}
if sect.Name == ".plt" {
msect.name = "__symbol_stub1"
msect.flag = 0x80000408 /* only instructions, code, symbol stubs */
msect.res1 = 0 //nkind[SymKindLocal];
msect.flag = S_ATTR_PURE_INSTRUCTIONS | S_ATTR_SOME_INSTRUCTIONS | S_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.flag = S_NON_LAZY_SYMBOL_POINTERS
msect.res1 = uint32(ctxt.Syms.Lookup(".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
msect.flag = S_MOD_INIT_FUNC_POINTERS
}
if segname == "__DWARF" {
msect.flag |= 0x02000000
msect.flag |= S_ATTR_DEBUG
}
}
@ -511,27 +559,27 @@ func Asmbmacho(ctxt *Link) {
Exitf("unknown macho architecture: %v", SysArch.Family)
case sys.ARM:
ml := newMachoLoad(5, 17+2) /* unix thread */
ml := newMachoLoad(LC_UNIXTHREAD, 17+2)
ml.data[0] = 1 /* thread type */
ml.data[1] = 17 /* word count */
ml.data[2+15] = uint32(Entryvalue(ctxt)) /* start pc */
case sys.AMD64:
ml := newMachoLoad(5, 42+2) /* unix thread */
ml := newMachoLoad(LC_UNIXTHREAD, 42+2)
ml.data[0] = 4 /* thread type */
ml.data[1] = 42 /* word count */
ml.data[2+32] = uint32(Entryvalue(ctxt)) /* start pc */
ml.data[2+32+1] = uint32(Entryvalue(ctxt) >> 32)
case sys.ARM64:
ml := newMachoLoad(5, 68+2) /* unix thread */
ml := newMachoLoad(LC_UNIXTHREAD, 68+2)
ml.data[0] = 6 /* thread type */
ml.data[1] = 68 /* word count */
ml.data[2+64] = uint32(Entryvalue(ctxt)) /* start pc */
ml.data[2+64+1] = uint32(Entryvalue(ctxt) >> 32)
case sys.I386:
ml := newMachoLoad(5, 16+2) /* unix thread */
ml := newMachoLoad(LC_UNIXTHREAD, 16+2)
ml.data[0] = 1 /* thread type */
ml.data[1] = 16 /* word count */
ml.data[2+10] = uint32(Entryvalue(ctxt)) /* start pc */
@ -555,7 +603,7 @@ func Asmbmacho(ctxt *Link) {
ms.prot2 = 3
}
ml := newMachoLoad(2, 4) /* LC_SYMTAB */
ml := newMachoLoad(LC_SYMTAB, 4)
ml.data[0] = uint32(linkoff) /* symoff */
ml.data[1] = uint32(nsortsym) /* nsyms */
ml.data[2] = uint32(linkoff + s1.Size + s2.Size + s3.Size) /* stroff */
@ -564,16 +612,16 @@ func Asmbmacho(ctxt *Link) {
machodysymtab(ctxt)
if Linkmode != LinkExternal {
ml := newMachoLoad(14, 6) /* LC_LOAD_DYLINKER */
ml.data[0] = 12 /* offset to string */
ml := newMachoLoad(LC_LOAD_DYLINKER, 6)
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 */
ml = newMachoLoad(LC_LOAD_DYLIB, 4+(uint32(len(dylib[i]))+1+7)/8*2)
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])
}
}
@ -588,8 +636,6 @@ func Asmbmacho(ctxt *Link) {
// and we can assume OS X.
//
// See golang.org/issues/12941.
const LC_VERSION_MIN_MACOSX = 0x24
ml := newMachoLoad(LC_VERSION_MIN_MACOSX, 2)
ml.data[0] = 10<<16 | 7<<8 | 0<<0 // OS X version 10.7.0
ml.data[1] = 10<<16 | 7<<8 | 0<<0 // SDK 10.7.0
@ -759,7 +805,7 @@ func machosymtab(ctxt *Link) {
}
func machodysymtab(ctxt *Link) {
ml := newMachoLoad(11, 18) /* LC_DYSYMTAB */
ml := newMachoLoad(LC_DYSYMTAB, 18)
n := 0
ml.data[0] = uint32(n) /* ilocalsym */

21
src/cmd/link/internal/ld/macho_combine_dwarf.go
View File

@ -21,27 +21,6 @@ var dwarfaddr, linkaddr int64
var linkoffset uint32
const (
LC_ID_DYLIB = 0xd
LC_LOAD_DYLINKER = 0xe
LC_PREBOUND_DYLIB = 0x10
LC_LOAD_WEAK_DYLIB = 0x18
LC_UUID = 0x1b
LC_RPATH = 0x8000001c
LC_CODE_SIGNATURE = 0x1d
LC_SEGMENT_SPLIT_INFO = 0x1e
LC_REEXPORT_DYLIB = 0x8000001f
LC_ENCRYPTION_INFO = 0x21
LC_DYLD_INFO = 0x22
LC_DYLD_INFO_ONLY = 0x80000022
LC_VERSION_MIN_MACOSX = 0x24
LC_VERSION_MIN_IPHONEOS = 0x25
LC_FUNCTION_STARTS = 0x26
LC_MAIN = 0x80000028
LC_DATA_IN_CODE = 0x29
LC_SOURCE_VERSION = 0x2A
LC_DYLIB_CODE_SIGN_DRS = 0x2B
LC_ENCRYPTION_INFO_64 = 0x2C
pageAlign = 12 // 4096 = 1 << 12
)