| // Derived from Inferno utils/6l/l.h and related files. |
| // http://code.google.com/p/inferno-os/source/browse/utils/6l/l.h |
| // |
| // 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 ld |
| |
| import ( |
| "bufio" |
| "cmd/internal/sys" |
| "debug/elf" |
| "fmt" |
| ) |
| |
| type LSym struct { |
| Name string |
| Extname string |
| Type int16 |
| Version int16 |
| Attr Attribute |
| Localentry uint8 |
| Dynid int32 |
| Plt int32 |
| Got int32 |
| Align int32 |
| Elfsym int32 |
| LocalElfsym int32 |
| Args int32 |
| Locals int32 |
| Value int64 |
| Size int64 |
| // ElfType is set for symbols read from shared libraries by ldshlibsyms. It |
| // is not set for symbols defined by the packages being linked or by symbols |
| // read by ldelf (and so is left as elf.STT_NOTYPE). |
| ElfType elf.SymType |
| Next *LSym |
| Sub *LSym |
| Outer *LSym |
| Gotype *LSym |
| Reachparent *LSym |
| File string |
| Dynimplib string |
| Dynimpvers string |
| Sect *Section |
| Autom []Auto |
| Pcln *Pcln |
| P []byte |
| R []Reloc |
| } |
| |
| func (s *LSym) String() string { |
| if s.Version == 0 { |
| return s.Name |
| } |
| return fmt.Sprintf("%s<%d>", s.Name, s.Version) |
| } |
| |
| func (s *LSym) ElfsymForReloc() int32 { |
| // If putelfsym created a local version of this symbol, use that in all |
| // relocations. |
| if s.LocalElfsym != 0 { |
| return s.LocalElfsym |
| } else { |
| return s.Elfsym |
| } |
| } |
| |
| // Attribute is a set of common symbol attributes. |
| type Attribute int16 |
| |
| const ( |
| AttrDuplicateOK Attribute = 1 << iota |
| AttrExternal |
| AttrNoSplit |
| AttrReachable |
| AttrCgoExportDynamic |
| AttrCgoExportStatic |
| AttrSpecial |
| AttrStackCheck |
| AttrHidden |
| AttrOnList |
| AttrLocal |
| AttrReflectMethod |
| ) |
| |
| func (a Attribute) DuplicateOK() bool { return a&AttrDuplicateOK != 0 } |
| func (a Attribute) External() bool { return a&AttrExternal != 0 } |
| func (a Attribute) NoSplit() bool { return a&AttrNoSplit != 0 } |
| func (a Attribute) Reachable() bool { return a&AttrReachable != 0 } |
| func (a Attribute) CgoExportDynamic() bool { return a&AttrCgoExportDynamic != 0 } |
| func (a Attribute) CgoExportStatic() bool { return a&AttrCgoExportStatic != 0 } |
| func (a Attribute) Special() bool { return a&AttrSpecial != 0 } |
| func (a Attribute) StackCheck() bool { return a&AttrStackCheck != 0 } |
| func (a Attribute) Hidden() bool { return a&AttrHidden != 0 } |
| func (a Attribute) OnList() bool { return a&AttrOnList != 0 } |
| func (a Attribute) Local() bool { return a&AttrLocal != 0 } |
| func (a Attribute) ReflectMethod() bool { return a&AttrReflectMethod != 0 } |
| |
| func (a Attribute) CgoExport() bool { |
| return a.CgoExportDynamic() || a.CgoExportStatic() |
| } |
| |
| func (a *Attribute) Set(flag Attribute, value bool) { |
| if value { |
| *a |= flag |
| } else { |
| *a &^= flag |
| } |
| } |
| |
| type Reloc struct { |
| Off int32 |
| Siz uint8 |
| Done uint8 |
| Type int32 |
| Variant int32 |
| Add int64 |
| Xadd int64 |
| Sym *LSym |
| Xsym *LSym |
| } |
| |
| type Auto struct { |
| Asym *LSym |
| Gotype *LSym |
| Aoffset int32 |
| Name int16 |
| } |
| |
| type Shlib struct { |
| Path string |
| Hash []byte |
| Deps []string |
| File *elf.File |
| gcdata_addresses map[*LSym]uint64 |
| } |
| |
| type Link struct { |
| Goarm int32 |
| Headtype int |
| Arch *sys.Arch |
| Debugvlog int32 |
| Bso *bufio.Writer |
| Windows int32 |
| Goroot string |
| |
| // Symbol lookup based on name and indexed by version. |
| Hash []map[string]*LSym |
| |
| Allsym []*LSym |
| Tlsg *LSym |
| Libdir []string |
| Library []*Library |
| Shlibs []Shlib |
| Tlsoffset int |
| Diag func(string, ...interface{}) |
| Cursym *LSym |
| Version int |
| Textp *LSym |
| Etextp *LSym |
| Nhistfile int32 |
| Filesyms *LSym |
| Moduledata *LSym |
| LSymBatch []LSym |
| } |
| |
| // The smallest possible offset from the hardware stack pointer to a local |
| // variable on the stack. Architectures that use a link register save its value |
| // on the stack in the function prologue and so always have a pointer between |
| // the hardware stack pointer and the local variable area. |
| func (ctxt *Link) FixedFrameSize() int64 { |
| switch ctxt.Arch.Family { |
| case sys.AMD64, sys.I386: |
| return 0 |
| case sys.PPC64: |
| // PIC code on ppc64le requires 32 bytes of stack, and it's easier to |
| // just use that much stack always on ppc64x. |
| return int64(4 * ctxt.Arch.PtrSize) |
| default: |
| return int64(ctxt.Arch.PtrSize) |
| } |
| } |
| |
| func (l *Link) IncVersion() { |
| l.Version++ |
| l.Hash = append(l.Hash, make(map[string]*LSym)) |
| } |
| |
| type Library struct { |
| Objref string |
| Srcref string |
| File string |
| Pkg string |
| Shlib string |
| hash []byte |
| } |
| |
| type Pcln struct { |
| Pcsp Pcdata |
| Pcfile Pcdata |
| Pcline Pcdata |
| Pcdata []Pcdata |
| Funcdata []*LSym |
| Funcdataoff []int64 |
| File []*LSym |
| } |
| |
| type Pcdata struct { |
| P []byte |
| } |
| |
| type Pciter struct { |
| d Pcdata |
| p []byte |
| pc uint32 |
| nextpc uint32 |
| pcscale uint32 |
| value int32 |
| start int |
| done int |
| } |
| |
| // Reloc.variant |
| const ( |
| RV_NONE = iota |
| RV_POWER_LO |
| RV_POWER_HI |
| RV_POWER_HA |
| RV_POWER_DS |
| |
| // RV_390_DBL is a s390x-specific relocation variant that indicates that |
| // the value to be placed into the relocatable field should first be |
| // divided by 2. |
| RV_390_DBL |
| |
| RV_CHECK_OVERFLOW = 1 << 8 |
| RV_TYPE_MASK = RV_CHECK_OVERFLOW - 1 |
| ) |
| |
| // Pcdata iterator. |
| // for(pciterinit(ctxt, &it, &pcd); !it.done; pciternext(&it)) { it.value holds in [it.pc, it.nextpc) } |
| |
| // Link holds the context for writing object code from a compiler |
| // to be linker input or for reading that input into the linker. |
| |
| // LinkArch is the definition of a single architecture. |
| |
| const ( |
| LinkAuto = 0 + iota |
| LinkInternal |
| LinkExternal |
| ) |
