/
asm.go
590 lines (517 loc) · 15.2 KB
/
asm.go
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// Inferno utils/5l/asm.c
// http://code.google.com/p/inferno-os/source/browse/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/obj"
"cmd/link/internal/ld"
"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 := ld.Linklookup(ctxt, "runtime.addmoduledata", 0)
if addmoduledata.Type == obj.STEXT {
// we're linking a module containing the runtime -> no need for
// an init function
return
}
addmoduledata.Attr |= ld.AttrReachable
initfunc := ld.Linklookup(ctxt, "go.link.addmoduledata", 0)
initfunc.Type = obj.STEXT
initfunc.Attr |= ld.AttrLocal
initfunc.Attr |= ld.AttrReachable
// larl %r2, <local.moduledata>
ld.Adduint8(ctxt, initfunc, 0xc0)
ld.Adduint8(ctxt, initfunc, 0x20)
lmd := ld.Addrel(initfunc)
lmd.Off = int32(initfunc.Size)
lmd.Siz = 4
lmd.Sym = ctxt.Moduledata
lmd.Type = obj.R_PCREL
lmd.Variant = ld.RV_390_DBL
lmd.Add = 2 + int64(lmd.Siz)
ld.Adduint32(ctxt, initfunc, 0)
// jg <runtime.addmoduledata[@plt]>
ld.Adduint8(ctxt, initfunc, 0xc0)
ld.Adduint8(ctxt, initfunc, 0xf4)
rel := ld.Addrel(initfunc)
rel.Off = int32(initfunc.Size)
rel.Siz = 4
rel.Sym = ld.Linklookup(ctxt, "runtime.addmoduledata", 0)
rel.Type = obj.R_CALL
rel.Variant = ld.RV_390_DBL
rel.Add = 2 + int64(rel.Siz)
ld.Adduint32(ctxt, initfunc, 0)
// undef (for debugging)
ld.Adduint32(ctxt, initfunc, 0)
ctxt.Textp = append(ctxt.Textp, initfunc)
initarray_entry := ld.Linklookup(ctxt, "go.link.addmoduledatainit", 0)
initarray_entry.Attr |= ld.AttrLocal
initarray_entry.Attr |= ld.AttrReachable
initarray_entry.Type = obj.SINITARR
ld.Addaddr(ctxt, initarray_entry, initfunc)
}
func adddynrel(ctxt *ld.Link, s *ld.Symbol, r *ld.Reloc) {
targ := r.Sym
ctxt.Cursym = s
switch r.Type {
default:
if r.Type >= 256 {
ctxt.Diag("unexpected relocation type %d", r.Type)
return
}
// Handle relocations found in ELF object files.
case 256 + ld.R_390_12,
256 + ld.R_390_GOT12:
ctxt.Diag("s390x 12-bit relocations have not been implemented (relocation type %d)", r.Type-256)
return
case 256 + ld.R_390_8,
256 + ld.R_390_16,
256 + ld.R_390_32,
256 + ld.R_390_64:
if targ.Type == obj.SDYNIMPORT {
ctxt.Diag("unexpected R_390_nn relocation for dynamic symbol %s", targ.Name)
}
r.Type = obj.R_ADDR
return
case 256 + ld.R_390_PC16,
256 + ld.R_390_PC32,
256 + ld.R_390_PC64:
if targ.Type == obj.SDYNIMPORT {
ctxt.Diag("unexpected R_390_PCnn relocation for dynamic symbol %s", targ.Name)
}
if targ.Type == 0 || targ.Type == obj.SXREF {
ctxt.Diag("unknown symbol %s in pcrel", targ.Name)
}
r.Type = obj.R_PCREL
r.Add += int64(r.Siz)
return
case 256 + ld.R_390_GOT16,
256 + ld.R_390_GOT32,
256 + ld.R_390_GOT64:
ctxt.Diag("unimplemented S390x relocation: %v", r.Type-256)
return
case 256 + ld.R_390_PLT16DBL,
256 + ld.R_390_PLT32DBL:
r.Type = obj.R_PCREL
r.Variant = ld.RV_390_DBL
r.Add += int64(r.Siz)
if targ.Type == obj.SDYNIMPORT {
addpltsym(ctxt, targ)
r.Sym = ld.Linklookup(ctxt, ".plt", 0)
r.Add += int64(targ.Plt)
}
return
case 256 + ld.R_390_PLT32,
256 + ld.R_390_PLT64:
r.Type = obj.R_PCREL
r.Add += int64(r.Siz)
if targ.Type == obj.SDYNIMPORT {
addpltsym(ctxt, targ)
r.Sym = ld.Linklookup(ctxt, ".plt", 0)
r.Add += int64(targ.Plt)
}
return
case 256 + ld.R_390_COPY:
ctxt.Diag("unimplemented S390x relocation: %v", r.Type-256)
case 256 + ld.R_390_GLOB_DAT:
ctxt.Diag("unimplemented S390x relocation: %v", r.Type-256)
case 256 + ld.R_390_JMP_SLOT:
ctxt.Diag("unimplemented S390x relocation: %v", r.Type-256)
case 256 + ld.R_390_RELATIVE:
ctxt.Diag("unimplemented S390x relocation: %v", r.Type-256)
case 256 + ld.R_390_GOTOFF:
if targ.Type == obj.SDYNIMPORT {
ctxt.Diag("unexpected R_390_GOTOFF relocation for dynamic symbol %s", targ.Name)
}
r.Type = obj.R_GOTOFF
return
case 256 + ld.R_390_GOTPC:
r.Type = obj.R_PCREL
r.Sym = ld.Linklookup(ctxt, ".got", 0)
r.Add += int64(r.Siz)
return
case 256 + ld.R_390_PC16DBL,
256 + ld.R_390_PC32DBL:
r.Type = obj.R_PCREL
r.Variant = ld.RV_390_DBL
r.Add += int64(r.Siz)
if targ.Type == obj.SDYNIMPORT {
ctxt.Diag("unexpected R_390_PCnnDBL relocation for dynamic symbol %s", targ.Name)
}
return
case 256 + ld.R_390_GOTPCDBL:
r.Type = obj.R_PCREL
r.Variant = ld.RV_390_DBL
r.Sym = ld.Linklookup(ctxt, ".got", 0)
r.Add += int64(r.Siz)
return
case 256 + ld.R_390_GOTENT:
addgotsym(ctxt, targ)
r.Type = obj.R_PCREL
r.Variant = ld.RV_390_DBL
r.Sym = ld.Linklookup(ctxt, ".got", 0)
r.Add += int64(targ.Got)
r.Add += int64(r.Siz)
return
}
// Handle references to ELF symbols from our own object files.
if targ.Type != obj.SDYNIMPORT {
return
}
ctxt.Diag("unsupported relocation for dynamic symbol %s (type=%d stype=%d)", targ.Name, r.Type, targ.Type)
}
func elfreloc1(ctxt *ld.Link, r *ld.Reloc, sectoff int64) int {
ld.Thearch.Vput(uint64(sectoff))
elfsym := r.Xsym.ElfsymForReloc()
switch r.Type {
default:
return -1
case obj.R_TLS_LE:
switch r.Siz {
default:
return -1
case 4:
// WARNING - silently ignored by linker in ELF64
ld.Thearch.Vput(ld.R_390_TLS_LE32 | uint64(elfsym)<<32)
case 8:
// WARNING - silently ignored by linker in ELF32
ld.Thearch.Vput(ld.R_390_TLS_LE64 | uint64(elfsym)<<32)
}
case obj.R_TLS_IE:
switch r.Siz {
default:
return -1
case 4:
ld.Thearch.Vput(ld.R_390_TLS_IEENT | uint64(elfsym)<<32)
}
case obj.R_ADDR:
switch r.Siz {
default:
return -1
case 4:
ld.Thearch.Vput(ld.R_390_32 | uint64(elfsym)<<32)
case 8:
ld.Thearch.Vput(ld.R_390_64 | uint64(elfsym)<<32)
}
case obj.R_GOTPCREL:
if r.Siz == 4 {
ld.Thearch.Vput(ld.R_390_GOTENT | uint64(elfsym)<<32)
} else {
return -1
}
case obj.R_PCREL, obj.R_PCRELDBL, obj.R_CALL:
elfrel := ld.R_390_NONE
isdbl := r.Variant&ld.RV_TYPE_MASK == ld.RV_390_DBL
// TODO(mundaym): all DBL style relocations should be
// signalled using the variant - see issue 14218.
switch r.Type {
case obj.R_PCRELDBL, obj.R_CALL:
isdbl = true
}
if r.Xsym.Type == obj.SDYNIMPORT && (r.Xsym.ElfType == elf.STT_FUNC || r.Type == obj.R_CALL) {
if isdbl {
switch r.Siz {
case 2:
elfrel = ld.R_390_PLT16DBL
case 4:
elfrel = ld.R_390_PLT32DBL
}
} else {
switch r.Siz {
case 4:
elfrel = ld.R_390_PLT32
case 8:
elfrel = ld.R_390_PLT64
}
}
} else {
if isdbl {
switch r.Siz {
case 2:
elfrel = ld.R_390_PC16DBL
case 4:
elfrel = ld.R_390_PC32DBL
}
} else {
switch r.Siz {
case 2:
elfrel = ld.R_390_PC16
case 4:
elfrel = ld.R_390_PC32
case 8:
elfrel = ld.R_390_PC64
}
}
}
if elfrel == ld.R_390_NONE {
return -1 // unsupported size/dbl combination
}
ld.Thearch.Vput(uint64(elfrel) | uint64(elfsym)<<32)
}
ld.Thearch.Vput(uint64(r.Xadd))
return 0
}
func elfsetupplt(ctxt *ld.Link) {
plt := ld.Linklookup(ctxt, ".plt", 0)
got := ld.Linklookup(ctxt, ".got", 0)
if plt.Size == 0 {
// stg %r1,56(%r15)
ld.Adduint8(ctxt, plt, 0xe3)
ld.Adduint8(ctxt, plt, 0x10)
ld.Adduint8(ctxt, plt, 0xf0)
ld.Adduint8(ctxt, plt, 0x38)
ld.Adduint8(ctxt, plt, 0x00)
ld.Adduint8(ctxt, plt, 0x24)
// larl %r1,_GLOBAL_OFFSET_TABLE_
ld.Adduint8(ctxt, plt, 0xc0)
ld.Adduint8(ctxt, plt, 0x10)
ld.Addpcrelplus(ctxt, plt, got, 6)
// mvc 48(8,%r15),8(%r1)
ld.Adduint8(ctxt, plt, 0xd2)
ld.Adduint8(ctxt, plt, 0x07)
ld.Adduint8(ctxt, plt, 0xf0)
ld.Adduint8(ctxt, plt, 0x30)
ld.Adduint8(ctxt, plt, 0x10)
ld.Adduint8(ctxt, plt, 0x08)
// lg %r1,16(%r1)
ld.Adduint8(ctxt, plt, 0xe3)
ld.Adduint8(ctxt, plt, 0x10)
ld.Adduint8(ctxt, plt, 0x10)
ld.Adduint8(ctxt, plt, 0x10)
ld.Adduint8(ctxt, plt, 0x00)
ld.Adduint8(ctxt, plt, 0x04)
// br %r1
ld.Adduint8(ctxt, plt, 0x07)
ld.Adduint8(ctxt, plt, 0xf1)
// nopr %r0
ld.Adduint8(ctxt, plt, 0x07)
ld.Adduint8(ctxt, plt, 0x00)
// nopr %r0
ld.Adduint8(ctxt, plt, 0x07)
ld.Adduint8(ctxt, plt, 0x00)
// nopr %r0
ld.Adduint8(ctxt, plt, 0x07)
ld.Adduint8(ctxt, plt, 0x00)
// assume got->size == 0 too
ld.Addaddrplus(ctxt, got, ld.Linklookup(ctxt, ".dynamic", 0), 0)
ld.Adduint64(ctxt, got, 0)
ld.Adduint64(ctxt, got, 0)
}
}
func machoreloc1(ctxt *ld.Link, r *ld.Reloc, sectoff int64) int {
return -1
}
func archreloc(ctxt *ld.Link, r *ld.Reloc, s *ld.Symbol, val *int64) int {
if ld.Linkmode == ld.LinkExternal {
return -1
}
switch r.Type {
case obj.R_CONST:
*val = r.Add
return 0
case obj.R_GOTOFF:
*val = ld.Symaddr(ctxt, r.Sym) + r.Add - ld.Symaddr(ctxt, ld.Linklookup(ctxt, ".got", 0))
return 0
}
return -1
}
func archrelocvariant(ctxt *ld.Link, r *ld.Reloc, s *ld.Symbol, t int64) int64 {
switch r.Variant & ld.RV_TYPE_MASK {
default:
ctxt.Diag("unexpected relocation variant %d", r.Variant)
return t
case ld.RV_NONE:
return t
case ld.RV_390_DBL:
if (t & 1) != 0 {
ctxt.Diag("%s+%v is not 2-byte aligned", r.Sym.Name, r.Sym.Value)
}
return t >> 1
}
}
func addpltsym(ctxt *ld.Link, s *ld.Symbol) {
if s.Plt >= 0 {
return
}
ld.Adddynsym(ctxt, s)
if ld.Iself {
plt := ld.Linklookup(ctxt, ".plt", 0)
got := ld.Linklookup(ctxt, ".got", 0)
rela := ld.Linklookup(ctxt, ".rela.plt", 0)
if plt.Size == 0 {
elfsetupplt(ctxt)
}
// larl %r1,_GLOBAL_OFFSET_TABLE_+index
ld.Adduint8(ctxt, plt, 0xc0)
ld.Adduint8(ctxt, plt, 0x10)
ld.Addpcrelplus(ctxt, plt, got, got.Size+6) // need variant?
// add to got: pointer to current pos in plt
ld.Addaddrplus(ctxt, got, plt, plt.Size+8) // weird but correct
// lg %r1,0(%r1)
ld.Adduint8(ctxt, plt, 0xe3)
ld.Adduint8(ctxt, plt, 0x10)
ld.Adduint8(ctxt, plt, 0x10)
ld.Adduint8(ctxt, plt, 0x00)
ld.Adduint8(ctxt, plt, 0x00)
ld.Adduint8(ctxt, plt, 0x04)
// br %r1
ld.Adduint8(ctxt, plt, 0x07)
ld.Adduint8(ctxt, plt, 0xf1)
// basr %r1,%r0
ld.Adduint8(ctxt, plt, 0x0d)
ld.Adduint8(ctxt, plt, 0x10)
// lgf %r1,12(%r1)
ld.Adduint8(ctxt, plt, 0xe3)
ld.Adduint8(ctxt, plt, 0x10)
ld.Adduint8(ctxt, plt, 0x10)
ld.Adduint8(ctxt, plt, 0x0c)
ld.Adduint8(ctxt, plt, 0x00)
ld.Adduint8(ctxt, plt, 0x14)
// jg .plt
ld.Adduint8(ctxt, plt, 0xc0)
ld.Adduint8(ctxt, plt, 0xf4)
ld.Adduint32(ctxt, plt, uint32(-((plt.Size - 2) >> 1))) // roll-your-own relocation
//.plt index
ld.Adduint32(ctxt, plt, uint32(rela.Size)) // rela size before current entry
// rela
ld.Addaddrplus(ctxt, rela, got, got.Size-8)
ld.Adduint64(ctxt, rela, ld.ELF64_R_INFO(uint32(s.Dynid), ld.R_390_JMP_SLOT))
ld.Adduint64(ctxt, rela, 0)
s.Plt = int32(plt.Size - 32)
} else {
ctxt.Diag("addpltsym: unsupported binary format")
}
}
func addgotsym(ctxt *ld.Link, s *ld.Symbol) {
if s.Got >= 0 {
return
}
ld.Adddynsym(ctxt, s)
got := ld.Linklookup(ctxt, ".got", 0)
s.Got = int32(got.Size)
ld.Adduint64(ctxt, got, 0)
if ld.Iself {
rela := ld.Linklookup(ctxt, ".rela", 0)
ld.Addaddrplus(ctxt, rela, got, int64(s.Got))
ld.Adduint64(ctxt, rela, ld.ELF64_R_INFO(uint32(s.Dynid), ld.R_390_GLOB_DAT))
ld.Adduint64(ctxt, rela, 0)
} else {
ctxt.Diag("addgotsym: unsupported binary format")
}
}
func asmb(ctxt *ld.Link) {
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f asmb\n", obj.Cputime())
}
if ld.Iself {
ld.Asmbelfsetup(ctxt)
}
sect := ld.Segtext.Sect
ld.Cseek(int64(sect.Vaddr - ld.Segtext.Vaddr + ld.Segtext.Fileoff))
ld.Codeblk(ctxt, int64(sect.Vaddr), int64(sect.Length))
for sect = sect.Next; sect != nil; sect = sect.Next {
ld.Cseek(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", obj.Cputime())
}
ld.Cseek(int64(ld.Segrodata.Fileoff))
ld.Datblk(ctxt, int64(ld.Segrodata.Vaddr), int64(ld.Segrodata.Filelen))
}
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f datblk\n", obj.Cputime())
}
ld.Cseek(int64(ld.Segdata.Fileoff))
ld.Datblk(ctxt, int64(ld.Segdata.Vaddr), int64(ld.Segdata.Filelen))
ld.Cseek(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 !ld.Iself {
ctxt.Diag("unsupported executable format")
}
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f sym\n", obj.Cputime())
}
symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen)
symo = uint32(ld.Rnd(int64(symo), int64(*ld.FlagRound)))
ld.Cseek(int64(symo))
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f elfsym\n", obj.Cputime())
}
ld.Asmelfsym(ctxt)
ld.Cflush()
ld.Cwrite(ld.Elfstrdat)
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f dwarf\n", obj.Cputime())
}
if ld.Linkmode == ld.LinkExternal {
ld.Elfemitreloc(ctxt)
}
}
ctxt.Cursym = nil
if ctxt.Debugvlog != 0 {
ctxt.Logf("%5.2f header\n", obj.Cputime())
}
ld.Cseek(0)
switch ld.HEADTYPE {
default:
ctxt.Diag("unsupported operating system")
case obj.Hlinux:
ld.Asmbelf(ctxt, int64(symo))
}
ld.Cflush()
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))
}
}