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// Inferno utils/5l/asm.c
// https://bitbucket.org/inferno-os/inferno-os/src/master/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 s390x
import (
"cmd/internal/objabi"
"cmd/internal/sys"
"cmd/link/internal/ld"
"cmd/link/internal/loader"
"cmd/link/internal/sym"
"debug/elf"
)
// gentext generates assembly to append the local moduledata to the global
// moduledata linked list at initialization time. This is only done if the runtime
// is in a different module.
//
// <go.link.addmoduledata>:
// larl %r2, <local.moduledata>
// jg <runtime.addmoduledata@plt>
// undef
//
// The job of appending the moduledata is delegated to runtime.addmoduledata.
func gentext(ctxt *ld.Link, ldr *loader.Loader) {
initfunc, addmoduledata := ld.PrepareAddmoduledata(ctxt)
if initfunc == nil {
return
}
// larl %r2, <local.moduledata>
initfunc.AddUint8(0xc0)
initfunc.AddUint8(0x20)
initfunc.AddSymRef(ctxt.Arch, ctxt.Moduledata, 6, objabi.R_PCREL, 4)
r1 := initfunc.Relocs()
ldr.SetRelocVariant(initfunc.Sym(), r1.Count()-1, sym.RV_390_DBL)
// jg <runtime.addmoduledata[@plt]>
initfunc.AddUint8(0xc0)
initfunc.AddUint8(0xf4)
initfunc.AddSymRef(ctxt.Arch, addmoduledata, 6, objabi.R_CALL, 4)
r2 := initfunc.Relocs()
ldr.SetRelocVariant(initfunc.Sym(), r2.Count()-1, sym.RV_390_DBL)
// undef (for debugging)
initfunc.AddUint32(ctxt.Arch, 0)
}
func adddynrel(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loader.Sym, r loader.Reloc, 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", r.Type())
return false
}
// Handle relocations found in ELF object files.
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_12),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOT12):
ldr.Errorf(s, "s390x 12-bit relocations have not been implemented (relocation type %d)", r.Type()-objabi.ElfRelocOffset)
return false
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_8),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_16),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_32),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_64):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected R_390_nn relocation for dynamic symbol %s", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_ADDR)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PC16),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PC32),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PC64):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected R_390_PCnn 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()+int64(r.Siz()))
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOT16),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOT32),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOT64):
ldr.Errorf(s, "unimplemented S390x relocation: %v", r.Type()-objabi.ElfRelocOffset)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PLT16DBL),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PLT32DBL):
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_PCREL)
ldr.SetRelocVariant(s, rIdx, sym.RV_390_DBL)
su.SetRelocAdd(rIdx, r.Add()+int64(r.Siz()))
if targType == sym.SDYNIMPORT {
addpltsym(target, ldr, syms, targ)
r.SetSym(syms.PLT)
su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymPlt(targ)))
}
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PLT32),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PLT64):
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_PCREL)
su.SetRelocAdd(rIdx, r.Add()+int64(r.Siz()))
if targType == sym.SDYNIMPORT {
addpltsym(target, ldr, syms, targ)
r.SetSym(syms.PLT)
su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymPlt(targ)))
}
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_COPY):
ldr.Errorf(s, "unimplemented S390x relocation: %v", r.Type()-objabi.ElfRelocOffset)
return false
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GLOB_DAT):
ldr.Errorf(s, "unimplemented S390x relocation: %v", r.Type()-objabi.ElfRelocOffset)
return false
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_JMP_SLOT):
ldr.Errorf(s, "unimplemented S390x relocation: %v", r.Type()-objabi.ElfRelocOffset)
return false
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_RELATIVE):
ldr.Errorf(s, "unimplemented S390x relocation: %v", r.Type()-objabi.ElfRelocOffset)
return false
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOTOFF):
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected R_390_GOTOFF relocation for dynamic symbol %s", ldr.SymName(targ))
}
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_GOTOFF)
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOTPC):
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_PCREL)
r.SetSym(syms.GOT)
su.SetRelocAdd(rIdx, r.Add()+int64(r.Siz()))
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PC16DBL),
objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PC32DBL):
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_PCREL)
ldr.SetRelocVariant(s, rIdx, sym.RV_390_DBL)
su.SetRelocAdd(rIdx, r.Add()+int64(r.Siz()))
if targType == sym.SDYNIMPORT {
ldr.Errorf(s, "unexpected R_390_PCnnDBL relocation for dynamic symbol %s", ldr.SymName(targ))
}
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOTPCDBL):
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_PCREL)
ldr.SetRelocVariant(s, rIdx, sym.RV_390_DBL)
r.SetSym(syms.GOT)
su.SetRelocAdd(rIdx, r.Add()+int64(r.Siz()))
return true
case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOTENT):
ld.AddGotSym(target, ldr, syms, targ, uint32(elf.R_390_GLOB_DAT))
su := ldr.MakeSymbolUpdater(s)
su.SetRelocType(rIdx, objabi.R_PCREL)
ldr.SetRelocVariant(s, rIdx, sym.RV_390_DBL)
r.SetSym(syms.GOT)
su.SetRelocAdd(rIdx, r.Add()+int64(ldr.SymGot(targ))+int64(r.Siz()))
return true
}
// Handle references to ELF symbols from our own object files.
if targType != sym.SDYNIMPORT {
return true
}
return false
}
func elfreloc1(ctxt *ld.Link, out *ld.OutBuf, ldr *loader.Loader, s loader.Sym, r loader.ExtReloc, ri int, sectoff int64) bool {
out.Write64(uint64(sectoff))
elfsym := ld.ElfSymForReloc(ctxt, r.Xsym)
siz := r.Size
switch r.Type {
default:
return false
case objabi.R_TLS_LE:
switch siz {
default:
return false
case 4:
// WARNING - silently ignored by linker in ELF64
out.Write64(uint64(elf.R_390_TLS_LE32) | uint64(elfsym)<<32)
case 8:
// WARNING - silently ignored by linker in ELF32
out.Write64(uint64(elf.R_390_TLS_LE64) | uint64(elfsym)<<32)
}
case objabi.R_TLS_IE:
switch siz {
default:
return false
case 4:
out.Write64(uint64(elf.R_390_TLS_IEENT) | uint64(elfsym)<<32)
}
case objabi.R_ADDR, objabi.R_DWARFSECREF:
switch siz {
default:
return false
case 4:
out.Write64(uint64(elf.R_390_32) | uint64(elfsym)<<32)
case 8:
out.Write64(uint64(elf.R_390_64) | uint64(elfsym)<<32)
}
case objabi.R_GOTPCREL:
if siz == 4 {
out.Write64(uint64(elf.R_390_GOTENT) | uint64(elfsym)<<32)
} else {
return false
}
case objabi.R_PCREL, objabi.R_PCRELDBL, objabi.R_CALL:
elfrel := elf.R_390_NONE
rVariant := ldr.RelocVariant(s, ri)
isdbl := rVariant&sym.RV_TYPE_MASK == sym.RV_390_DBL
// TODO(mundaym): all DBL style relocations should be
// signalled using the variant - see issue 14218.
switch r.Type {
case objabi.R_PCRELDBL, objabi.R_CALL:
isdbl = true
}
if ldr.SymType(r.Xsym) == sym.SDYNIMPORT && (ldr.SymElfType(r.Xsym) == elf.STT_FUNC || r.Type == objabi.R_CALL) {
if isdbl {
switch siz {
case 2:
elfrel = elf.R_390_PLT16DBL
case 4:
elfrel = elf.R_390_PLT32DBL
}
} else {
switch siz {
case 4:
elfrel = elf.R_390_PLT32
case 8:
elfrel = elf.R_390_PLT64
}
}
} else {
if isdbl {
switch siz {
case 2:
elfrel = elf.R_390_PC16DBL
case 4:
elfrel = elf.R_390_PC32DBL
}
} else {
switch siz {
case 2:
elfrel = elf.R_390_PC16
case 4:
elfrel = elf.R_390_PC32
case 8:
elfrel = elf.R_390_PC64
}
}
}
if elfrel == elf.R_390_NONE {
return false // unsupported size/dbl combination
}
out.Write64(uint64(elfrel) | uint64(elfsym)<<32)
}
out.Write64(uint64(r.Xadd))
return true
}
func elfsetupplt(ctxt *ld.Link, plt, got *loader.SymbolBuilder, dynamic loader.Sym) {
if plt.Size() == 0 {
// stg %r1,56(%r15)
plt.AddUint8(0xe3)
plt.AddUint8(0x10)
plt.AddUint8(0xf0)
plt.AddUint8(0x38)
plt.AddUint8(0x00)
plt.AddUint8(0x24)
// larl %r1,_GLOBAL_OFFSET_TABLE_
plt.AddUint8(0xc0)
plt.AddUint8(0x10)
plt.AddSymRef(ctxt.Arch, got.Sym(), 6, objabi.R_PCRELDBL, 4)
// mvc 48(8,%r15),8(%r1)
plt.AddUint8(0xd2)
plt.AddUint8(0x07)
plt.AddUint8(0xf0)
plt.AddUint8(0x30)
plt.AddUint8(0x10)
plt.AddUint8(0x08)
// lg %r1,16(%r1)
plt.AddUint8(0xe3)
plt.AddUint8(0x10)
plt.AddUint8(0x10)
plt.AddUint8(0x10)
plt.AddUint8(0x00)
plt.AddUint8(0x04)
// br %r1
plt.AddUint8(0x07)
plt.AddUint8(0xf1)
// nopr %r0
plt.AddUint8(0x07)
plt.AddUint8(0x00)
// nopr %r0
plt.AddUint8(0x07)
plt.AddUint8(0x00)
// nopr %r0
plt.AddUint8(0x07)
plt.AddUint8(0x00)
// assume got->size == 0 too
got.AddAddrPlus(ctxt.Arch, dynamic, 0)
got.AddUint64(ctxt.Arch, 0)
got.AddUint64(ctxt.Arch, 0)
}
}
func machoreloc1(*sys.Arch, *ld.OutBuf, *loader.Loader, loader.Sym, loader.ExtReloc, int64) bool {
return false
}
func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loader.Reloc, s loader.Sym, val int64) (o int64, nExtReloc int, ok bool) {
return val, 0, false
}
func archrelocvariant(target *ld.Target, ldr *loader.Loader, r loader.Reloc, rv sym.RelocVariant, s loader.Sym, t int64) int64 {
switch rv & sym.RV_TYPE_MASK {
default:
ldr.Errorf(s, "unexpected relocation variant %d", rv)
return t
case sym.RV_NONE:
return t
case sym.RV_390_DBL:
if t&1 != 0 {
ldr.Errorf(s, "%s+%v is not 2-byte aligned", ldr.SymName(r.Sym()), ldr.SymValue(r.Sym()))
}
return t >> 1
}
}
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)
got := ldr.MakeSymbolUpdater(syms.GOT)
rela := ldr.MakeSymbolUpdater(syms.RelaPLT)
if plt.Size() == 0 {
panic("plt is not set up")
}
// larl %r1,_GLOBAL_OFFSET_TABLE_+index
plt.AddUint8(0xc0)
plt.AddUint8(0x10)
plt.AddPCRelPlus(target.Arch, got.Sym(), got.Size()+6)
pltrelocs := plt.Relocs()
ldr.SetRelocVariant(plt.Sym(), pltrelocs.Count()-1, sym.RV_390_DBL)
// add to got: pointer to current pos in plt
got.AddAddrPlus(target.Arch, plt.Sym(), plt.Size()+8) // weird but correct
// lg %r1,0(%r1)
plt.AddUint8(0xe3)
plt.AddUint8(0x10)
plt.AddUint8(0x10)
plt.AddUint8(0x00)
plt.AddUint8(0x00)
plt.AddUint8(0x04)
// br %r1
plt.AddUint8(0x07)
plt.AddUint8(0xf1)
// basr %r1,%r0
plt.AddUint8(0x0d)
plt.AddUint8(0x10)
// lgf %r1,12(%r1)
plt.AddUint8(0xe3)
plt.AddUint8(0x10)
plt.AddUint8(0x10)
plt.AddUint8(0x0c)
plt.AddUint8(0x00)
plt.AddUint8(0x14)
// jg .plt
plt.AddUint8(0xc0)
plt.AddUint8(0xf4)
plt.AddUint32(target.Arch, uint32(-((plt.Size() - 2) >> 1))) // roll-your-own relocation
//.plt index
plt.AddUint32(target.Arch, uint32(rela.Size())) // rela size before current entry
// rela
rela.AddAddrPlus(target.Arch, got.Sym(), got.Size()-8)
sDynid := ldr.SymDynid(s)
rela.AddUint64(target.Arch, elf.R_INFO(uint32(sDynid), uint32(elf.R_390_JMP_SLOT)))
rela.AddUint64(target.Arch, 0)
ldr.SetPlt(s, int32(plt.Size()-32))
} else {
ldr.Errorf(s, "addpltsym: unsupported binary format")
}
}
|
