// 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 s390x
import (
"cmd/internal/objabi"
"cmd/internal/sys"
"cmd/link/internal/ld"
"cmd/link/internal/sym"
"debug/elf"
"fmt"
)
// 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) {
if !ctxt.DynlinkingGo() {
return
}
addmoduledata := ctxt.Syms.Lookup("runtime.addmoduledata", 0)
if addmoduledata.Type == sym.STEXT && ctxt.BuildMode != ld.BuildModePlugin {
// we're linking a module containing the runtime -> no need for
// an init function
return
}
addmoduledata.Attr |= sym.AttrReachable
initfunc := ctxt.Syms.Lookup("go.link.addmoduledata", 0)
initfunc.Type = sym.STEXT
initfunc.Attr |= sym.AttrLocal
initfunc.Attr |= sym.AttrReachable
// larl %r2, <local.moduledata>
initfunc.AddUint8(0xc0)
initfunc.AddUint8(0x20)
lmd := initfunc.AddRel()
lmd.Off = int32(initfunc.Size)
lmd.Siz = 4
lmd.Sym = ctxt.Moduledata
lmd.Type = objabi.R_PCREL
lmd.Variant = sym.RV_390_DBL
lmd.Add = 2 + int64(lmd.Siz)
initfunc.AddUint32(ctxt.Arch, 0)
// jg <runtime.addmoduledata[@plt]>
initfunc.AddUint8(0xc0)
initfunc.AddUint8(0xf4)
rel := initfunc.AddRel()
rel.Off = int32(initfunc.Size)
rel.Siz = 4
rel.Sym = ctxt.Syms.Lookup("runtime.addmoduledata", 0)
rel.Type = objabi.R_CALL
rel.Variant = sym.RV_390_DBL
rel.Add = 2 + int64(rel.Siz)
initfunc.AddUint32(ctxt.Arch, 0)
// undef (for debugging)
initfunc.AddUint32(ctxt.Arch, 0)
if ctxt.BuildMode == ld.BuildModePlugin {
ctxt.Textp = append(ctxt.Textp, addmoduledata)
}
ctxt.Textp = append(ctxt.Textp, initfunc)
initarray_entry := ctxt.Syms.Lookup("go.link.addmoduledatainit", 0)
initarray_entry.Attr |= sym.AttrLocal
initarray_entry.Attr |= sym.AttrReachable
initarray_entry.Type = sym.SINITARR
initarray_entry.AddAddr(ctxt.Arch, initfunc)
}
func adddynrel(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc) bool {
targ := r.Sym
switch r.Type {
default:
if r.Type >= 256 {
ld.Errorf(s, "unexpected relocation type %d", r.Type)
return false
}
// Handle relocations found in ELF object files.
case 256 + objabi.RelocType(elf.R_390_12),
256 + objabi.RelocType(elf.R_390_GOT12):
ld.Errorf(s, "s390x 12-bit relocations have not been implemented (relocation type %d)", r.Type-256)
return false
case 256 + objabi.RelocType(elf.R_390_8),
256 + objabi.RelocType(elf.R_390_16),
256 + objabi.RelocType(elf.R_390_32),
256 + objabi.RelocType(elf.R_390_64):
if targ.Type == sym.SDYNIMPORT {
ld.Errorf(s, "unexpected R_390_nn relocation for dynamic symbol %s", targ.Name)
}
r.Type = objabi.R_ADDR
return true
case 256 + objabi.RelocType(elf.R_390_PC16),
256 + objabi.RelocType(elf.R_390_PC32),
256 + objabi.RelocType(elf.R_390_PC64):
if targ.Type == sym.SDYNIMPORT {
ld.Errorf(s, "unexpected R_390_PCnn relocation for dynamic symbol %s", targ.Name)
}
// TODO(mwhudson): the test of VisibilityHidden here probably doesn't make
// sense and should be removed when someone has thought about it properly.
if (targ.Type == 0 || targ.Type == sym.SXREF) && !targ.Attr.VisibilityHidden() {
ld.Errorf(s, "unknown symbol %s in pcrel", targ.Name)
}
r.Type = objabi.R_PCREL
r.Add += int64(r.Siz)
return true
case 256 + objabi.RelocType(elf.R_390_GOT16),
256 + objabi.RelocType(elf.R_390_GOT32),
256 + objabi.RelocType(elf.R_390_GOT64):
ld.Errorf(s, "unimplemented S390x relocation: %v", r.Type-256)
return true
case 256 + objabi.RelocType(elf.R_390_PLT16DBL),
256 + objabi.RelocType(elf.R_390_PLT32DBL):
r.Type = objabi.R_PCREL
r.Variant = sym.RV_390_DBL
r.Add += int64(r.Siz)
if targ.Type == sym.SDYNIMPORT {
addpltsym(ctxt, targ)
r.Sym = ctxt.Syms.Lookup(".plt", 0)
r.Add += int64(targ.Plt)
}
return true
case 256 + objabi.RelocType(elf.R_390_PLT32),
256 + objabi.RelocType(elf.R_390_PLT64):
r.Type = objabi.R_PCREL
r.Add += int64(r.Siz)
if targ.Type == sym.SDYNIMPORT {
addpltsym(ctxt, targ)
r.Sym = ctxt.Syms.Lookup(".plt", 0)
r.Add += int64(targ.Plt)
}
return true
case 256 + objabi.RelocType(elf.R_390_COPY):
ld.Errorf(s, "unimplemented S390x relocation: %v", r.Type-256)
return false
case 256 + objabi.RelocType(elf.R_390_GLOB_DAT):
ld.Errorf(s, "unimplemented S390x relocation: %v", r.Type-256)
return false
case 256 + objabi.RelocType(elf.R_390_JMP_SLOT):
ld.Errorf(s, "unimplemented S390x relocation: %v", r.Type-256)
return false
case 256 + objabi.RelocType(elf.R_390_RELATIVE):
ld.Errorf(s, "unimplemented S390x relocation: %v", r.Type-256)
return false
case 256 + objabi.RelocType(elf.R_390_GOTOFF):
if targ.Type == sym.SDYNIMPORT {
ld.Errorf(s, "unexpected R_390_GOTOFF relocation for dynamic symbol %s", targ.Name)
}
r.Type = objabi.R_GOTOFF
return true
case 256 + objabi.RelocType(elf.R_390_GOTPC):
r.Type = objabi.R_PCREL
r.Sym = ctxt.Syms.Lookup(".got", 0)
r.Add += int64(r.Siz)
return true
case 256 + objabi.RelocType(elf.R_390_PC16DBL),
256 + objabi.RelocType(elf.R_390_PC32DBL):
r.Type = objabi.R_PCREL
r.Variant = sym.RV_390_DBL
r.Add += int64(r.Siz)
if targ.Type == sym.SDYNIMPORT {
ld.Errorf(s, "unexpected R_390_PCnnDBL relocation for dynamic symbol %s", targ.Name)
}
return true
case 256 + objabi.RelocType(elf.R_390_GOTPCDBL):
r.Type = objabi.R_PCREL
r.Variant = sym.RV_390_DBL
r.Sym = ctxt.Syms.Lookup(".got", 0)
r.Add += int64(r.Siz)
return true
case 256 + objabi.RelocType(elf.R_390_GOTENT):
addgotsym(ctxt, targ)
r.Type = objabi.R_PCREL
r.Variant = sym.RV_390_DBL
r.Sym = ctxt.Syms.Lookup(".got", 0)
r.Add += int64(targ.Got)
r.Add += int64(r.Siz)
return true
}
// Handle references to ELF symbols from our own object files.
if targ.Type != sym.SDYNIMPORT {
return true
}
return false
}
func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
ctxt.Out.Write64(uint64(sectoff))
elfsym := r.Xsym.ElfsymForReloc()
switch r.Type {
default:
return false
case objabi.R_TLS_LE:
switch r.Siz {
default:
return false
case 4:
// WARNING - silently ignored by linker in ELF64
ctxt.Out.Write64(uint64(elf.R_390_TLS_LE32) | uint64(elfsym)<<32)
case 8:
// WARNING - silently ignored by linker in ELF32
ctxt.Out.Write64(uint64(elf.R_390_TLS_LE64) | uint64(elfsym)<<32)
}
case objabi.R_TLS_IE:
switch r.Siz {
default:
return false
case 4:
ctxt.Out.Write64(uint64(elf.R_390_TLS_IEENT) | uint64(elfsym)<<32)
}
case objabi.R_ADDR:
switch r.Siz {
default:
return false
case 4:
ctxt.Out.Write64(uint64(elf.R_390_32) | uint64(elfsym)<<32)
case 8:
ctxt.Out.Write64(uint64(elf.R_390_64) | uint64(elfsym)<<32)
}
case objabi.R_GOTPCREL:
if r.Siz == 4 {
ctxt.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
isdbl := r.Variant&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 r.Xsym.Type == sym.SDYNIMPORT && (r.Xsym.ElfType == elf.STT_FUNC || r.Type == objabi.R_CALL) {
if isdbl {
switch r.Siz {
case 2:
elfrel = elf.R_390_PLT16DBL
case 4:
elfrel = elf.R_390_PLT32DBL
}
} else {
switch r.Siz {
case 4:
elfrel = elf.R_390_PLT32
case 8:
elfrel = elf.R_390_PLT64
}
}
} else {
if isdbl {
switch r.Siz {
case 2:
elfrel = elf.R_390_PC16DBL
case 4:
elfrel = elf.R_390_PC32DBL
}
} else {
switch r.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
}
ctxt.Out.Write64(uint64(elfrel) | uint64(elfsym)<<32)
}
ctxt.Out.Write64(uint64(r.Xadd))
return true
}
func elfsetupplt(ctxt *ld.Link) {
plt := ctxt.Syms.Lookup(".plt", 0)
got := ctxt.Syms.Lookup(".got", 0)
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.AddPCRelPlus(ctxt.Arch, got, 6)
// 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, ctxt.Syms.Lookup(".dynamic", 0), 0)
got.AddUint64(ctxt.Arch, 0)
got.AddUint64(ctxt.Arch, 0)
}
}
func machoreloc1(arch *sys.Arch, out *ld.OutBuf, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
return false
}
func archreloc(ctxt *ld.Link, r *sym.Reloc, s *sym.Symbol, val *int64) bool {
if ctxt.LinkMode == ld.LinkExternal {
return false
}
switch r.Type {
case objabi.R_CONST:
*val = r.Add
return true
case objabi.R_GOTOFF:
*val = ld.Symaddr(r.Sym) + r.Add - ld.Symaddr(ctxt.Syms.Lookup(".got", 0))
return true
}
return false
}
func archrelocvariant(ctxt *ld.Link, r *sym.Reloc, s *sym.Symbol, t int64) int64 {
switch r.Variant & sym.RV_TYPE_MASK {
default:
ld.Errorf(s, "unexpected relocation variant %d", r.Variant)
return t
case sym.RV_NONE:
return t
case sym.RV_390_DBL:
if (t & 1) != 0 {
ld.Errorf(s, "%s+%v is not 2-byte aligned", r.Sym.Name, r.Sym.Value)
}
return t >> 1
}
}
func addpltsym(ctxt *ld.Link, s *sym.Symbol) {
if s.Plt >= 0 {
return
}
ld.Adddynsym(ctxt, s)
if ctxt.IsELF {
plt := ctxt.Syms.Lookup(".plt", 0)
got := ctxt.Syms.Lookup(".got", 0)
rela := ctxt.Syms.Lookup(".rela.plt", 0)
if plt.Size == 0 {
elfsetupplt(ctxt)
}
// larl %r1,_GLOBAL_OFFSET_TABLE_+index
plt.AddUint8(0xc0)
plt.AddUint8(0x10)
plt.AddPCRelPlus(ctxt.Arch, got, got.Size+6) // need variant?
// add to got: pointer to current pos in plt
got.AddAddrPlus(ctxt.Arch, plt, 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(ctxt.Arch, uint32(-((plt.Size - 2) >> 1))) // roll-your-own relocation
//.plt index
plt.AddUint32(ctxt.Arch, uint32(rela.Size)) // rela size before current entry
// rela
rela.AddAddrPlus(ctxt.Arch, got, got.Size-8)
rela.AddUint64(ctxt.Arch, ld.ELF64_R_INFO(uint32(s.Dynid), uint32(elf.R_390_JMP_SLOT)))
rela.AddUint64(ctxt.Arch, 0)
s.Plt = int32(plt.Size - 32)
} else {
ld.Errorf(s, "addpltsym: unsupported binary format")
}
}
func addgotsym(ctxt *ld.Link, s *sym.Symbol) {
if s.Got >= 0 {
return
}
ld.Adddynsym(ctxt, s)
got := ctxt.Syms.Lookup(".got", 0)
s.Got = int32(got.Size)
got.AddUint64(ctxt.Arch, 0)
if ctxt.IsELF {
rela := ctxt.Syms.Lookup(".rela", 0)
rela.AddAddrPlus(ctxt.Arch, got, int64(s.Got))
rela.AddUint64(ctxt.Arch, ld.ELF64_R_INFO(uint32(s.Dynid), uint32(elf.R_390_GLOB_DAT)))
rela.AddUint64(ctxt.Arch, 0)
} else {
ld.Errorf(s, "addgotsym: unsupported binary format")
}
}
func asmb(ctxt *ld.Link) {
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f asmb\n", ld.Cputime())
}
if ctxt.IsELF {
ld.Asmbelfsetup()
}
sect := ld.Segtext.Sections[0]
ctxt.Out.SeekSet(int64(sect.Vaddr - ld.Segtext.Vaddr + ld.Segtext.Fileoff))
ld.Codeblk(ctxt, int64(sect.Vaddr), int64(sect.Length))
for _, sect = range ld.Segtext.Sections[1:] {
ctxt.Out.SeekSet(int64(sect.Vaddr - ld.Segtext.Vaddr + ld.Segtext.Fileoff))
ld.Datblk(ctxt, int64(sect.Vaddr), int64(sect.Length))
}
if ld.Segrodata.Filelen > 0 {
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f rodatblk\n", ld.Cputime())
}
ctxt.Out.SeekSet(int64(ld.Segrodata.Fileoff))
ld.Datblk(ctxt, int64(ld.Segrodata.Vaddr), int64(ld.Segrodata.Filelen))
}
if ld.Segrelrodata.Filelen > 0 {
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f rodatblk\n", ld.Cputime())
}
ctxt.Out.SeekSet(int64(ld.Segrelrodata.Fileoff))
ld.Datblk(ctxt, int64(ld.Segrelrodata.Vaddr), int64(ld.Segrelrodata.Filelen))
}
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f datblk\n", ld.Cputime())
}
ctxt.Out.SeekSet(int64(ld.Segdata.Fileoff))
ld.Datblk(ctxt, int64(ld.Segdata.Vaddr), int64(ld.Segdata.Filelen))
ctxt.Out.SeekSet(int64(ld.Segdwarf.Fileoff))
ld.Dwarfblk(ctxt, int64(ld.Segdwarf.Vaddr), int64(ld.Segdwarf.Filelen))
/* output symbol table */
ld.Symsize = 0
ld.Lcsize = 0
symo := uint32(0)
if !*ld.FlagS {
if !ctxt.IsELF {
ld.Errorf(nil, "unsupported executable format")
}
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f sym\n", ld.Cputime())
}
symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen)
symo = uint32(ld.Rnd(int64(symo), int64(*ld.FlagRound)))
ctxt.Out.SeekSet(int64(symo))
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f elfsym\n", ld.Cputime())
}
ld.Asmelfsym(ctxt)
ctxt.Out.Flush()
ctxt.Out.Write(ld.Elfstrdat)
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f dwarf\n", ld.Cputime())
}
if ctxt.LinkMode == ld.LinkExternal {
ld.Elfemitreloc(ctxt)
}
}
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f header\n", ld.Cputime())
}
ctxt.Out.SeekSet(0)
switch ctxt.HeadType {
default:
ld.Errorf(nil, "unsupported operating system")
case objabi.Hlinux:
ld.Asmbelf(ctxt, int64(symo))
}
ctxt.Out.Flush()
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))
}
}