diff options
Diffstat (limited to 'src/cmd/oldlink/internal/s390x/asm.go')
| -rw-r--r-- | src/cmd/oldlink/internal/s390x/asm.go | 574 |
1 files changed, 574 insertions, 0 deletions
diff --git a/src/cmd/oldlink/internal/s390x/asm.go b/src/cmd/oldlink/internal/s390x/asm.go new file mode 100644 index 0000000000..6c5744dc95 --- /dev/null +++ b/src/cmd/oldlink/internal/s390x/asm.go @@ -0,0 +1,574 @@ +// 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/oldlink/internal/ld" + "cmd/oldlink/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.InitExt() + 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.InitExt() + 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 + r.InitExt() + + switch r.Type { + default: + if r.Type >= objabi.ElfRelocOffset { + ld.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): + ld.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 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 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 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 objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOT16), + objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOT32), + objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GOT64): + ld.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): + 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 objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PLT32), + objabi.ElfRelocOffset + 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 objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_COPY): + ld.Errorf(s, "unimplemented S390x relocation: %v", r.Type-objabi.ElfRelocOffset) + return false + + case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_GLOB_DAT): + ld.Errorf(s, "unimplemented S390x relocation: %v", r.Type-objabi.ElfRelocOffset) + return false + + case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_JMP_SLOT): + ld.Errorf(s, "unimplemented S390x relocation: %v", r.Type-objabi.ElfRelocOffset) + return false + + case objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_RELATIVE): + ld.Errorf(s, "unimplemented S390x relocation: %v", r.Type-objabi.ElfRelocOffset) + return false + + case objabi.ElfRelocOffset + 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 objabi.ElfRelocOffset + 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 objabi.ElfRelocOffset + objabi.RelocType(elf.R_390_PC16DBL), + objabi.ElfRelocOffset + 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 objabi.ElfRelocOffset + 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 objabi.ElfRelocOffset + 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) (int64, bool) { + if ctxt.LinkMode == ld.LinkExternal { + return val, false + } + + switch r.Type { + case objabi.R_CONST: + return r.Add, true + case objabi.R_GOTOFF: + return ld.Symaddr(r.Sym) + r.Add - ld.Symaddr(ctxt.Syms.Lookup(".got", 0)), true + } + + return val, 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.SetPlt(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.SetGot(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.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 { + ctxt.Out.SeekSet(int64(ld.Segrodata.Fileoff)) + ld.Datblk(ctxt, int64(ld.Segrodata.Vaddr), int64(ld.Segrodata.Filelen)) + } + if ld.Segrelrodata.Filelen > 0 { + ctxt.Out.SeekSet(int64(ld.Segrelrodata.Fileoff)) + ld.Datblk(ctxt, int64(ld.Segrelrodata.Vaddr), int64(ld.Segrelrodata.Filelen)) + } + + 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)) +} + +func asmb2(ctxt *ld.Link) { + /* output symbol table */ + ld.Symsize = 0 + + ld.Lcsize = 0 + symo := uint32(0) + if !*ld.FlagS { + if !ctxt.IsELF { + ld.Errorf(nil, "unsupported executable format") + } + symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen) + symo = uint32(ld.Rnd(int64(symo), int64(*ld.FlagRound))) + + ctxt.Out.SeekSet(int64(symo)) + ld.Asmelfsym(ctxt) + ctxt.Out.Flush() + ctxt.Out.Write(ld.Elfstrdat) + + if ctxt.LinkMode == ld.LinkExternal { + ld.Elfemitreloc(ctxt) + } + } + + 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)) + } +} |