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go/src/cmd/link/internal/arm64/asm.go
Jeremy Faller c551318046 [dev.link] cmd/link: move macho asmb2 support to generic functions 
Change-Id: Ic360af7c0e8de3446aa8d26d70f95f87690087ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/234883
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2020-05-26 17:48:40 +00:00

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// Inferno utils/5l/asm.c
// https://bitbucket.org/inferno-os/inferno-os/src/default/utils/5l/asm.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package arm64
import (
"cmd/internal/objabi"
"cmd/internal/sys"
"cmd/link/internal/ld"
"cmd/link/internal/loader"
"cmd/link/internal/sym"
"debug/elf"
"fmt"
"log"
)
func gentext(ctxt *ld.Link, ldr *loader.Loader) {
initfunc, addmoduledata := ld.PrepareAddmoduledata(ctxt)
if initfunc == nil {
return
}
o := func(op uint32) {
initfunc.AddUint32(ctxt.Arch, op)
}
// 0000000000000000 <local.dso_init>:
// 0: 90000000 adrp x0, 0 <runtime.firstmoduledata>
// 0: R_AARCH64_ADR_PREL_PG_HI21 local.moduledata
// 4: 91000000 add x0, x0, #0x0
// 4: R_AARCH64_ADD_ABS_LO12_NC local.moduledata
o(0x90000000)
o(0x91000000)
rel := loader.Reloc{
Off: 0,
Size: 8,
Type: objabi.R_ADDRARM64,
Sym: ctxt.Moduledata,
}
initfunc.AddReloc(rel)
// 8: 14000000 b 0 <runtime.addmoduledata>
// 8: R_AARCH64_CALL26 runtime.addmoduledata
o(0x14000000)
rel2 := loader.Reloc{
Off: 8,
Size: 4,
Type: objabi.R_CALLARM64, // Really should be R_AARCH64_JUMP26 but doesn't seem to make any difference
Sym: addmoduledata,
}
initfunc.AddReloc(rel2)
}
func adddynrel(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loader.Sym, r loader.Reloc2, rIdx int) bool {
targ := r.Sym()
var targType sym.SymKind
if targ != 0 {
targType = ldr.SymType(targ)
}
switch r.Type() {
default:
if r.Type() >= objabi.ElfRelocOffset {
ldr.Errorf(s, "unexpected relocation type %d (%s)", r.Type(), sym.RelocName(target.Arch, r.Type()))
return false
}
// Handle relocations found in ELF object files.
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_PREL32):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected R_AARCH64_PREL32 relocation for dynamic symbol %s", ldr.SymName(targ))
}
// TODO(mwhudson): the test of VisibilityHidden here probably doesn't make
// sense and should be removed when someone has thought about it properly.
if (targType == 0 || targType == sym.SXREF) && !ldr.AttrVisibilityHidden(targ) {
ldr.Errorf(s, "unknown symbol %s in pcrel", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_PCREL)
su.SetRelocAdd(rIdx, r.Add()+4)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_PREL64):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected R_AARCH64_PREL64 relocation for dynamic symbol %s", ldr.SymName(targ))
}
if targType == 0 || targType == sym.SXREF {
ldr.Errorf(s, "unknown symbol %s in pcrel", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_PCREL)
su.SetRelocAdd(rIdx, r.Add()+8)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_CALL26),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_JUMP26):
if targType == sym.SDYNIMPORT {
addpltsym(target, ldr, syms, targ)
su := ldr.MakeSymbolUpdater(s)
su.SetRelocSym(rIdx, syms.PLT)
su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymPlt(targ)))
}
if (targType == 0 || targType == sym.SXREF) && !ldr.AttrVisibilityHidden(targ) {
ldr.Errorf(s, "unknown symbol %s in callarm64", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_CALLARM64)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_ADR_GOT_PAGE),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_LD64_GOT_LO12_NC):
if targType != sym.SDYNIMPORT {
// have symbol
// TODO: turn LDR of GOT entry into ADR of symbol itself
}
// fall back to using GOT
// TODO: just needs relocation, no need to put in .dynsym
addgotsym(target, ldr, syms, targ)
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_ARM64_GOT)
su.SetRelocSym(rIdx, syms.GOT)
su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymGot(targ)))
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_ADR_PREL_PG_HI21),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_ADD_ABS_LO12_NC):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected relocation for dynamic symbol %s", ldr.SymName(targ))
}
if targType == 0 || targType == sym.SXREF {
ldr.Errorf(s, "unknown symbol %s", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_ARM64_PCREL)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_ABS64):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected R_AARCH64_ABS64 relocation for dynamic symbol %s", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_ADDR)
if target.IsPIE() && target.IsInternal() {
// For internal linking PIE, this R_ADDR relocation cannot
// be resolved statically. We need to generate a dynamic
// relocation. Let the code below handle it.
break
}
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_LDST8_ABS_LO12_NC):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected relocation for dynamic symbol %s", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_ARM64_LDST8)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_LDST32_ABS_LO12_NC):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected relocation for dynamic symbol %s", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_ARM64_LDST32)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_LDST64_ABS_LO12_NC):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected relocation for dynamic symbol %s", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_ARM64_LDST64)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_LDST128_ABS_LO12_NC):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected relocation for dynamic symbol %s", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_ARM64_LDST128)
return true
}
// Reread the reloc to incorporate any changes in type above.
relocs := ldr.Relocs(s)
r = relocs.At2(rIdx)
switch r.Type() {
case objabi.R_CALL,
objabi.R_PCREL,
objabi.R_CALLARM64:
if targType != sym.SDYNIMPORT {
// nothing to do, the relocation will be laid out in reloc
return true
}
if target.IsExternal() {
// External linker will do this relocation.
return true
}
case objabi.R_ADDR:
if ldr.SymType(s) == sym.STEXT && target.IsElf() {
// The code is asking for the address of an external
// function. We provide it with the address of the
// correspondent GOT symbol.
addgotsym(target, ldr, syms, targ)
su := ldr.MakeSymbolUpdater(s)
su.SetRelocSym(rIdx, syms.GOT)
su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymGot(targ)))
return true
}
// Process dynamic relocations for the data sections.
if target.IsPIE() && target.IsInternal() {
// When internally linking, generate dynamic relocations
// for all typical R_ADDR relocations. The exception
// are those R_ADDR that are created as part of generating
// the dynamic relocations and must be resolved statically.
//
// There are three phases relevant to understanding this:
//
// dodata() // we are here
// address() // symbol address assignment
// reloc() // resolution of static R_ADDR relocs
//
// At this point symbol addresses have not been
// assigned yet (as the final size of the .rela section
// will affect the addresses), and so we cannot write
// the Elf64_Rela.r_offset now. Instead we delay it
// until after the 'address' phase of the linker is
// complete. We do this via Addaddrplus, which creates
// a new R_ADDR relocation which will be resolved in
// the 'reloc' phase.
//
// These synthetic static R_ADDR relocs must be skipped
// now, or else we will be caught in an infinite loop
// of generating synthetic relocs for our synthetic
// relocs.
//
// Furthermore, the rela sections contain dynamic
// relocations with R_ADDR relocations on
// Elf64_Rela.r_offset. This field should contain the
// symbol offset as determined by reloc(), not the
// final dynamically linked address as a dynamic
// relocation would provide.
switch ldr.SymName(s) {
case ".dynsym", ".rela", ".rela.plt", ".got.plt", ".dynamic":
return false
}
} else {
// Either internally linking a static executable,
// in which case we can resolve these relocations
// statically in the 'reloc' phase, or externally
// linking, in which case the relocation will be
// prepared in the 'reloc' phase and passed to the
// external linker in the 'asmb' phase.
if ldr.SymType(s) != sym.SDATA && ldr.SymType(s) != sym.SRODATA {
break
}
}
if target.IsElf() {
// Generate R_AARCH64_RELATIVE relocations for best
// efficiency in the dynamic linker.
//
// As noted above, symbol addresses have not been
// assigned yet, so we can't generate the final reloc
// entry yet. We ultimately want:
//
// r_offset = s + r.Off
// r_info = R_AARCH64_RELATIVE
// r_addend = targ + r.Add
//
// The dynamic linker will set *offset = base address +
// addend.
//
// AddAddrPlus is used for r_offset and r_addend to
// generate new R_ADDR relocations that will update
// these fields in the 'reloc' phase.
rela := ldr.MakeSymbolUpdater(syms.Rela)
rela.AddAddrPlus(target.Arch, s, int64(r.Off()))
if r.Siz() == 8 {
rela.AddUint64(target.Arch, ld.ELF64_R_INFO(0, uint32(elf.R_AARCH64_RELATIVE)))
} else {
ldr.Errorf(s, "unexpected relocation for dynamic symbol %s", ldr.SymName(targ))
}
rela.AddAddrPlus(target.Arch, targ, int64(r.Add()))
// Not mark r done here. So we still apply it statically,
// so in the file content we'll also have the right offset
// to the relocation target. So it can be examined statically
// (e.g. go version).
return true
}
}
return false
}
func elfreloc1(ctxt *ld.Link, ldr *loader.Loader, s loader.Sym, r loader.ExtRelocView, sectoff int64) bool {
ctxt.Out.Write64(uint64(sectoff))
elfsym := ld.ElfSymForReloc(ctxt, r.Xsym)
siz := r.Siz()
switch r.Type() {
default:
return false
case objabi.R_ADDR, objabi.R_DWARFSECREF:
switch siz {
case 4:
ctxt.Out.Write64(uint64(elf.R_AARCH64_ABS32) | uint64(elfsym)<<32)
case 8:
ctxt.Out.Write64(uint64(elf.R_AARCH64_ABS64) | uint64(elfsym)<<32)
default:
return false
}
case objabi.R_ADDRARM64:
// two relocations: R_AARCH64_ADR_PREL_PG_HI21 and R_AARCH64_ADD_ABS_LO12_NC
ctxt.Out.Write64(uint64(elf.R_AARCH64_ADR_PREL_PG_HI21) | uint64(elfsym)<<32)
ctxt.Out.Write64(uint64(r.Xadd))
ctxt.Out.Write64(uint64(sectoff + 4))
ctxt.Out.Write64(uint64(elf.R_AARCH64_ADD_ABS_LO12_NC) | uint64(elfsym)<<32)
case objabi.R_ARM64_TLS_LE:
ctxt.Out.Write64(uint64(elf.R_AARCH64_TLSLE_MOVW_TPREL_G0) | uint64(elfsym)<<32)
case objabi.R_ARM64_TLS_IE:
ctxt.Out.Write64(uint64(elf.R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21) | uint64(elfsym)<<32)
ctxt.Out.Write64(uint64(r.Xadd))
ctxt.Out.Write64(uint64(sectoff + 4))
ctxt.Out.Write64(uint64(elf.R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC) | uint64(elfsym)<<32)
case objabi.R_ARM64_GOTPCREL:
ctxt.Out.Write64(uint64(elf.R_AARCH64_ADR_GOT_PAGE) | uint64(elfsym)<<32)
ctxt.Out.Write64(uint64(r.Xadd))
ctxt.Out.Write64(uint64(sectoff + 4))
ctxt.Out.Write64(uint64(elf.R_AARCH64_LD64_GOT_LO12_NC) | uint64(elfsym)<<32)
case objabi.R_CALLARM64:
if siz != 4 {
return false
}
ctxt.Out.Write64(uint64(elf.R_AARCH64_CALL26) | uint64(elfsym)<<32)
}
ctxt.Out.Write64(uint64(r.Xadd))
return true
}
func machoreloc1(arch *sys.Arch, out *ld.OutBuf, ldr *loader.Loader, s loader.Sym, r loader.ExtRelocView, sectoff int64) bool {
var v uint32
rs := r.Xsym
rt := r.Type()
siz := r.Siz()
if ldr.SymType(rs) == sym.SHOSTOBJ || rt == objabi.R_CALLARM64 || rt == objabi.R_ADDRARM64 {
if ldr.SymDynid(rs) < 0 {
ldr.Errorf(s, "reloc %d (%s) to non-macho symbol %s type=%d (%s)", rt, sym.RelocName(arch, rt), ldr.SymName(rs), ldr.SymType(rs), ldr.SymType(rs))
return false
}
v = uint32(ldr.SymDynid(rs))
v |= 1 << 27 // external relocation
} else {
v = uint32(ldr.SymSect(rs).Extnum)
if v == 0 {
ldr.Errorf(s, "reloc %d (%s) to symbol %s in non-macho section %s type=%d (%s)", rt, sym.RelocName(arch, rt), ldr.SymName(rs), ldr.SymSect(rs).Name, ldr.SymType(rs), ldr.SymType(rs))
return false
}
}
switch rt {
default:
return false
case objabi.R_ADDR:
v |= ld.MACHO_ARM64_RELOC_UNSIGNED << 28
case objabi.R_CALLARM64:
if r.Xadd != 0 {
ldr.Errorf(s, "ld64 doesn't allow BR26 reloc with non-zero addend: %s+%d", ldr.SymName(rs), r.Xadd)
}
v |= 1 << 24 // pc-relative bit
v |= ld.MACHO_ARM64_RELOC_BRANCH26 << 28
case objabi.R_ADDRARM64:
siz = 4
// Two relocation entries: MACHO_ARM64_RELOC_PAGEOFF12 MACHO_ARM64_RELOC_PAGE21
// if r.Xadd is non-zero, add two MACHO_ARM64_RELOC_ADDEND.
if r.Xadd != 0 {
out.Write32(uint32(sectoff + 4))
out.Write32((ld.MACHO_ARM64_RELOC_ADDEND << 28) | (2 << 25) | uint32(r.Xadd&0xffffff))
}
out.Write32(uint32(sectoff + 4))
out.Write32(v | (ld.MACHO_ARM64_RELOC_PAGEOFF12 << 28) | (2 << 25))
if r.Xadd != 0 {
out.Write32(uint32(sectoff))
out.Write32((ld.MACHO_ARM64_RELOC_ADDEND << 28) | (2 << 25) | uint32(r.Xadd&0xffffff))
}
v |= 1 << 24 // pc-relative bit
v |= ld.MACHO_ARM64_RELOC_PAGE21 << 28
}
switch siz {
default:
return false
case 1:
v |= 0 << 25
case 2:
v |= 1 << 25
case 4:
v |= 2 << 25
case 8:
v |= 3 << 25
}
out.Write32(uint32(sectoff))
out.Write32(v)
return true
}
func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loader.Reloc2, rr *loader.ExtReloc, s loader.Sym, val int64) (int64, bool, bool) {
const extRelocNeeded = true
const extRelocNotNeeded = false
const isOk = true
rs := ldr.ResolveABIAlias(r.Sym())
if target.IsExternal() {
switch r.Type() {
default:
case objabi.R_ARM64_GOTPCREL,
objabi.R_ADDRARM64:
// set up addend for eventual relocation via outer symbol.
rs, off := ld.FoldSubSymbolOffset(ldr, rs)
rr.Xadd = r.Add() + off
rst := ldr.SymType(rs)
if rst != sym.SHOSTOBJ && rst != sym.SDYNIMPORT && ldr.SymSect(rs) == nil {
ldr.Errorf(s, "missing section for %s", ldr.SymName(rs))
}
rr.Xsym = rs
// Note: ld64 currently has a bug that any non-zero addend for BR26 relocation
// will make the linking fail because it thinks the code is not PIC even though
// the BR26 relocation should be fully resolved at link time.
// That is the reason why the next if block is disabled. When the bug in ld64
// is fixed, we can enable this block and also enable duff's device in cmd/7g.
if false && target.IsDarwin() {
var o0, o1 uint32
if target.IsBigEndian() {
o0 = uint32(val >> 32)
o1 = uint32(val)
} else {
o0 = uint32(val)
o1 = uint32(val >> 32)
}
// Mach-O wants the addend to be encoded in the instruction
// Note that although Mach-O supports ARM64_RELOC_ADDEND, it
// can only encode 24-bit of signed addend, but the instructions
// supports 33-bit of signed addend, so we always encode the
// addend in place.
o0 |= (uint32((rr.Xadd>>12)&3) << 29) | (uint32((rr.Xadd>>12>>2)&0x7ffff) << 5)
o1 |= uint32(rr.Xadd&0xfff) << 10
rr.Xadd = 0
// when laid out, the instruction order must always be o1, o2.
if target.IsBigEndian() {
val = int64(o0)<<32 | int64(o1)
} else {
val = int64(o1)<<32 | int64(o0)
}
}
return val, extRelocNeeded, isOk
case objabi.R_CALLARM64,
objabi.R_ARM64_TLS_LE,
objabi.R_ARM64_TLS_IE:
rr.Xsym = rs
rr.Xadd = r.Add()
return val, extRelocNeeded, isOk
}
}
switch r.Type() {
case objabi.R_ADDRARM64:
t := ldr.SymAddr(rs) + r.Add() - ((ldr.SymValue(s) + int64(r.Off())) &^ 0xfff)
if t >= 1<<32 || t < -1<<32 {
ldr.Errorf(s, "program too large, address relocation distance = %d", t)
}
var o0, o1 uint32
if target.IsBigEndian() {
o0 = uint32(val >> 32)
o1 = uint32(val)
} else {
o0 = uint32(val)
o1 = uint32(val >> 32)
}
o0 |= (uint32((t>>12)&3) << 29) | (uint32((t>>12>>2)&0x7ffff) << 5)
o1 |= uint32(t&0xfff) << 10
// when laid out, the instruction order must always be o1, o2.
if target.IsBigEndian() {
return int64(o0)<<32 | int64(o1), extRelocNotNeeded, true
}
return int64(o1)<<32 | int64(o0), extRelocNotNeeded, true
case objabi.R_ARM64_TLS_LE:
if target.IsDarwin() {
ldr.Errorf(s, "TLS reloc on unsupported OS %v", target.HeadType)
}
// The TCB is two pointers. This is not documented anywhere, but is
// de facto part of the ABI.
v := ldr.SymValue(rs) + int64(2*target.Arch.PtrSize)
if v < 0 || v >= 32678 {
ldr.Errorf(s, "TLS offset out of range %d", v)
}
return val | (v << 5), extRelocNeeded, true
case objabi.R_ARM64_TLS_IE:
if target.IsPIE() && target.IsElf() {
// We are linking the final executable, so we
// can optimize any TLS IE relocation to LE.
if !target.IsLinux() {
ldr.Errorf(s, "TLS reloc on unsupported OS %v", target.HeadType)
}
// The TCB is two pointers. This is not documented anywhere, but is
// de facto part of the ABI.
v := ldr.SymAddr(rs) + int64(2*target.Arch.PtrSize) + r.Add()
if v < 0 || v >= 32678 {
ldr.Errorf(s, "TLS offset out of range %d", v)
}
var o0, o1 uint32
if target.IsBigEndian() {
o0 = uint32(val >> 32)
o1 = uint32(val)
} else {
o0 = uint32(val)
o1 = uint32(val >> 32)
}
// R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
// turn ADRP to MOVZ
o0 = 0xd2a00000 | uint32(o0&0x1f) | (uint32((v>>16)&0xffff) << 5)
// R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
// turn LD64 to MOVK
if v&3 != 0 {
ldr.Errorf(s, "invalid address: %x for relocation type: R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC", v)
}
o1 = 0xf2800000 | uint32(o1&0x1f) | (uint32(v&0xffff) << 5)
// when laid out, the instruction order must always be o0, o1.
if target.IsBigEndian() {
return int64(o0)<<32 | int64(o1), extRelocNotNeeded, isOk
}
return int64(o1)<<32 | int64(o0), extRelocNotNeeded, isOk
} else {
log.Fatalf("cannot handle R_ARM64_TLS_IE (sym %s) when linking internally", ldr.SymName(s))
}
case objabi.R_CALLARM64:
var t int64
if ldr.SymType(rs) == sym.SDYNIMPORT {
t = (ldr.SymAddr(syms.PLT) + r.Add()) - (ldr.SymValue(s) + int64(r.Off()))
} else {
t = (ldr.SymAddr(rs) + r.Add()) - (ldr.SymValue(s) + int64(r.Off()))
}
if t >= 1<<27 || t < -1<<27 {
ldr.Errorf(s, "program too large, call relocation distance = %d", t)
}
return val | ((t >> 2) & 0x03ffffff), extRelocNotNeeded, true
case objabi.R_ARM64_GOT:
sData := ldr.Data(s)
if sData[r.Off()+3]&0x9f == 0x90 {
// R_AARCH64_ADR_GOT_PAGE
// patch instruction: adrp
t := ldr.SymAddr(rs) + r.Add() - ((ldr.SymValue(s) + int64(r.Off())) &^ 0xfff)
if t >= 1<<32 || t < -1<<32 {
ldr.Errorf(s, "program too large, address relocation distance = %d", t)
}
var o0 uint32
o0 |= (uint32((t>>12)&3) << 29) | (uint32((t>>12>>2)&0x7ffff) << 5)
return val | int64(o0), extRelocNotNeeded, isOk
} else if sData[r.Off()+3] == 0xf9 {
// R_AARCH64_LD64_GOT_LO12_NC
// patch instruction: ldr
t := ldr.SymAddr(rs) + r.Add() - ((ldr.SymValue(s) + int64(r.Off())) &^ 0xfff)
if t&7 != 0 {
ldr.Errorf(s, "invalid address: %x for relocation type: R_AARCH64_LD64_GOT_LO12_NC", t)
}
var o1 uint32
o1 |= uint32(t&0xfff) << (10 - 3)
return val | int64(uint64(o1)), extRelocNotNeeded, isOk
} else {
ldr.Errorf(s, "unsupported instruction for %v R_GOTARM64", sData[r.Off():r.Off()+4])
}
case objabi.R_ARM64_PCREL:
sData := ldr.Data(s)
if sData[r.Off()+3]&0x9f == 0x90 {
// R_AARCH64_ADR_PREL_PG_HI21
// patch instruction: adrp
t := ldr.SymAddr(rs) + r.Add() - ((ldr.SymValue(s) + int64(r.Off())) &^ 0xfff)
if t >= 1<<32 || t < -1<<32 {
ldr.Errorf(s, "program too large, address relocation distance = %d", t)
}
o0 := (uint32((t>>12)&3) << 29) | (uint32((t>>12>>2)&0x7ffff) << 5)
return val | int64(o0), extRelocNotNeeded, isOk
} else if sData[r.Off()+3]&0x91 == 0x91 {
// R_AARCH64_ADD_ABS_LO12_NC
// patch instruction: add
t := ldr.SymAddr(rs) + r.Add() - ((ldr.SymValue(s) + int64(r.Off())) &^ 0xfff)
o1 := uint32(t&0xfff) << 10
return val | int64(o1), extRelocNotNeeded, isOk
} else {
ldr.Errorf(s, "unsupported instruction for %v R_PCRELARM64", sData[r.Off():r.Off()+4])
}
case objabi.R_ARM64_LDST8:
t := ldr.SymAddr(rs) + r.Add() - ((ldr.SymValue(s) + int64(r.Off())) &^ 0xfff)
o0 := uint32(t&0xfff) << 10
return val | int64(o0), extRelocNotNeeded, true
case objabi.R_ARM64_LDST32:
t := ldr.SymAddr(rs) + r.Add() - ((ldr.SymValue(s) + int64(r.Off())) &^ 0xfff)
if t&3 != 0 {
ldr.Errorf(s, "invalid address: %x for relocation type: R_AARCH64_LDST32_ABS_LO12_NC", t)
}
o0 := (uint32(t&0xfff) >> 2) << 10
return val | int64(o0), extRelocNotNeeded, true
case objabi.R_ARM64_LDST64:
t := ldr.SymAddr(rs) + r.Add() - ((ldr.SymValue(s) + int64(r.Off())) &^ 0xfff)
if t&7 != 0 {
ldr.Errorf(s, "invalid address: %x for relocation type: R_AARCH64_LDST64_ABS_LO12_NC", t)
}
o0 := (uint32(t&0xfff) >> 3) << 10
return val | int64(o0), extRelocNotNeeded, true
case objabi.R_ARM64_LDST128:
t := ldr.SymAddr(rs) + r.Add() - ((ldr.SymValue(s) + int64(r.Off())) &^ 0xfff)
if t&15 != 0 {
ldr.Errorf(s, "invalid address: %x for relocation type: R_AARCH64_LDST128_ABS_LO12_NC", t)
}
o0 := (uint32(t&0xfff) >> 4) << 10
return val | int64(o0), extRelocNotNeeded, true
}
return val, false, false
}
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc2, sym.RelocVariant, loader.Sym, int64) int64 {
log.Fatalf("unexpected relocation variant")
return -1
}
func elfsetupplt(ctxt *ld.Link, plt, gotplt *loader.SymbolBuilder, dynamic loader.Sym) {
if plt.Size() == 0 {
// stp x16, x30, [sp, #-16]!
// identifying information
plt.AddUint32(ctxt.Arch, 0xa9bf7bf0)
// the following two instructions (adrp + ldr) load *got[2] into x17
// adrp x16, &got[0]
plt.AddSymRef(ctxt.Arch, gotplt.Sym(), 16, objabi.R_ARM64_GOT, 4)
plt.SetUint32(ctxt.Arch, plt.Size()-4, 0x90000010)
// <imm> is the offset value of &got[2] to &got[0], the same below
// ldr x17, [x16, <imm>]
plt.AddSymRef(ctxt.Arch, gotplt.Sym(), 16, objabi.R_ARM64_GOT, 4)
plt.SetUint32(ctxt.Arch, plt.Size()-4, 0xf9400211)
// add x16, x16, <imm>
plt.AddSymRef(ctxt.Arch, gotplt.Sym(), 16, objabi.R_ARM64_PCREL, 4)
plt.SetUint32(ctxt.Arch, plt.Size()-4, 0x91000210)
// br x17
plt.AddUint32(ctxt.Arch, 0xd61f0220)
// 3 nop for place holder
plt.AddUint32(ctxt.Arch, 0xd503201f)
plt.AddUint32(ctxt.Arch, 0xd503201f)
plt.AddUint32(ctxt.Arch, 0xd503201f)
// check gotplt.size == 0
if gotplt.Size() != 0 {
ctxt.Errorf(gotplt.Sym(), "got.plt is not empty at the very beginning")
}
gotplt.AddAddrPlus(ctxt.Arch, dynamic, 0)
gotplt.AddUint64(ctxt.Arch, 0)
gotplt.AddUint64(ctxt.Arch, 0)
}
}
func addpltsym(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loader.Sym) {
if ldr.SymPlt(s) >= 0 {
return
}
ld.Adddynsym(ldr, target, syms, s)
if target.IsElf() {
plt := ldr.MakeSymbolUpdater(syms.PLT)
gotplt := ldr.MakeSymbolUpdater(syms.GOTPLT)
rela := ldr.MakeSymbolUpdater(syms.RelaPLT)
if plt.Size() == 0 {
panic("plt is not set up")
}
// adrp x16, &got.plt[0]
plt.AddAddrPlus4(target.Arch, gotplt.Sym(), gotplt.Size())
plt.SetUint32(target.Arch, plt.Size()-4, 0x90000010)
relocs := plt.Relocs()
plt.SetRelocType(relocs.Count()-1, objabi.R_ARM64_GOT)
// <offset> is the offset value of &got.plt[n] to &got.plt[0]
// ldr x17, [x16, <offset>]
plt.AddAddrPlus4(target.Arch, gotplt.Sym(), gotplt.Size())
plt.SetUint32(target.Arch, plt.Size()-4, 0xf9400211)
relocs = plt.Relocs()
plt.SetRelocType(relocs.Count()-1, objabi.R_ARM64_GOT)
// add x16, x16, <offset>
plt.AddAddrPlus4(target.Arch, gotplt.Sym(), gotplt.Size())
plt.SetUint32(target.Arch, plt.Size()-4, 0x91000210)
relocs = plt.Relocs()
plt.SetRelocType(relocs.Count()-1, objabi.R_ARM64_PCREL)
// br x17
plt.AddUint32(target.Arch, 0xd61f0220)
// add to got.plt: pointer to plt[0]
gotplt.AddAddrPlus(target.Arch, plt.Sym(), 0)
// rela
rela.AddAddrPlus(target.Arch, gotplt.Sym(), gotplt.Size()-8)
sDynid := ldr.SymDynid(s)
rela.AddUint64(target.Arch, ld.ELF64_R_INFO(uint32(sDynid), uint32(elf.R_AARCH64_JUMP_SLOT)))
rela.AddUint64(target.Arch, 0)
ldr.SetPlt(s, int32(plt.Size()-16))
} else {
ldr.Errorf(s, "addpltsym: unsupported binary format")
}
}
func addgotsym(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loader.Sym) {
if ldr.SymGot(s) >= 0 {
return
}
ld.Adddynsym(ldr, target, syms, s)
got := ldr.MakeSymbolUpdater(syms.GOT)
ldr.SetGot(s, int32(got.Size()))
got.AddUint64(target.Arch, 0)
if target.IsElf() {
rela := ldr.MakeSymbolUpdater(syms.Rela)
rela.AddAddrPlus(target.Arch, got.Sym(), int64(ldr.SymGot(s)))
rela.AddUint64(target.Arch, ld.ELF64_R_INFO(uint32(ldr.SymDynid(s)), uint32(elf.R_AARCH64_GLOB_DAT)))
rela.AddUint64(target.Arch, 0)
} else {
ldr.Errorf(s, "addgotsym: unsupported binary format")
}
}
func asmb2(ctxt *ld.Link, _ *loader.Loader) {
if ctxt.IsDarwin() {
panic("darwin should be generic")
}
/* output symbol table */
ld.Symsize = 0
ld.Lcsize = 0
symo := uint32(0)
if !*ld.FlagS {
// TODO: rationalize
switch ctxt.HeadType {
default:
if ctxt.IsELF {
symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen)
symo = uint32(ld.Rnd(int64(symo), int64(*ld.FlagRound)))
}
}
ctxt.Out.SeekSet(int64(symo))
switch ctxt.HeadType {
default:
if ctxt.IsELF {
ld.Asmelfsym(ctxt)
ctxt.Out.Write(ld.Elfstrdat)
if ctxt.LinkMode == ld.LinkExternal {
ld.Elfemitreloc(ctxt)
}
}
}
}
ctxt.Out.SeekSet(0)
switch ctxt.HeadType {
default:
case objabi.Hlinux,
objabi.Hfreebsd,
objabi.Hnetbsd,
objabi.Hopenbsd:
ld.Asmbelf(ctxt, int64(symo))
}
if *ld.FlagC {
fmt.Printf("textsize=%d\n", ld.Segtext.Filelen)
fmt.Printf("datsize=%d\n", ld.Segdata.Filelen)
fmt.Printf("bsssize=%d\n", ld.Segdata.Length-ld.Segdata.Filelen)
fmt.Printf("symsize=%d\n", ld.Symsize)
fmt.Printf("lcsize=%d\n", ld.Lcsize)
fmt.Printf("total=%d\n", ld.Segtext.Filelen+ld.Segdata.Length+uint64(ld.Symsize)+uint64(ld.Lcsize))
}
}
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