| // Inferno utils/8l/asm.c |
| // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/8l/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 x86 |
| |
| import ( |
| "cmd/internal/objabi" |
| "cmd/internal/sys" |
| "cmd/link/internal/ld" |
| "cmd/link/internal/sym" |
| "debug/elf" |
| "log" |
| ) |
| |
| // Append 4 bytes to s and create a R_CALL relocation targeting t to fill them in. |
| func addcall(ctxt *ld.Link, s *sym.Symbol, t *sym.Symbol) { |
| s.Attr |= sym.AttrReachable |
| i := s.Size |
| s.Size += 4 |
| s.Grow(s.Size) |
| r := s.AddRel() |
| r.Sym = t |
| r.Off = int32(i) |
| r.Type = objabi.R_CALL |
| r.Siz = 4 |
| } |
| |
| func gentext(ctxt *ld.Link) { |
| if ctxt.DynlinkingGo() { |
| // We need get_pc_thunk. |
| } else { |
| switch ctxt.BuildMode { |
| case ld.BuildModeCArchive: |
| if !ctxt.IsELF { |
| return |
| } |
| case ld.BuildModePIE, ld.BuildModeCShared, ld.BuildModePlugin: |
| // We need get_pc_thunk. |
| default: |
| return |
| } |
| } |
| |
| // Generate little thunks that load the PC of the next instruction into a register. |
| thunks := make([]*sym.Symbol, 0, 7+len(ctxt.Textp)) |
| for _, r := range [...]struct { |
| name string |
| num uint8 |
| }{ |
| {"ax", 0}, |
| {"cx", 1}, |
| {"dx", 2}, |
| {"bx", 3}, |
| // sp |
| {"bp", 5}, |
| {"si", 6}, |
| {"di", 7}, |
| } { |
| thunkfunc := ctxt.Syms.Lookup("__x86.get_pc_thunk."+r.name, 0) |
| thunkfunc.Type = sym.STEXT |
| thunkfunc.Attr |= sym.AttrLocal |
| thunkfunc.Attr |= sym.AttrReachable //TODO: remove? |
| o := func(op ...uint8) { |
| for _, op1 := range op { |
| thunkfunc.AddUint8(op1) |
| } |
| } |
| // 8b 04 24 mov (%esp),%eax |
| // Destination register is in bits 3-5 of the middle byte, so add that in. |
| o(0x8b, 0x04+r.num<<3, 0x24) |
| // c3 ret |
| o(0xc3) |
| |
| thunks = append(thunks, thunkfunc) |
| } |
| ctxt.Textp = append(thunks, ctxt.Textp...) // keep Textp in dependency order |
| |
| 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 |
| o := func(op ...uint8) { |
| for _, op1 := range op { |
| initfunc.AddUint8(op1) |
| } |
| } |
| |
| // go.link.addmoduledata: |
| // 53 push %ebx |
| // e8 00 00 00 00 call __x86.get_pc_thunk.cx + R_CALL __x86.get_pc_thunk.cx |
| // 8d 81 00 00 00 00 lea 0x0(%ecx), %eax + R_PCREL ctxt.Moduledata |
| // 8d 99 00 00 00 00 lea 0x0(%ecx), %ebx + R_GOTPC _GLOBAL_OFFSET_TABLE_ |
| // e8 00 00 00 00 call runtime.addmoduledata@plt + R_CALL runtime.addmoduledata |
| // 5b pop %ebx |
| // c3 ret |
| |
| o(0x53) |
| |
| o(0xe8) |
| addcall(ctxt, initfunc, ctxt.Syms.Lookup("__x86.get_pc_thunk.cx", 0)) |
| |
| o(0x8d, 0x81) |
| initfunc.AddPCRelPlus(ctxt.Arch, ctxt.Moduledata, 6) |
| |
| o(0x8d, 0x99) |
| i := initfunc.Size |
| initfunc.Size += 4 |
| initfunc.Grow(initfunc.Size) |
| r := initfunc.AddRel() |
| r.Sym = ctxt.Syms.Lookup("_GLOBAL_OFFSET_TABLE_", 0) |
| r.Off = int32(i) |
| r.Type = objabi.R_PCREL |
| r.Add = 12 |
| r.Siz = 4 |
| |
| o(0xe8) |
| addcall(ctxt, initfunc, addmoduledata) |
| |
| o(0x5b) |
| |
| o(0xc3) |
| |
| 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.AttrReachable |
| initarray_entry.Attr |= sym.AttrLocal |
| 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 (%s)", r.Type, sym.RelocName(ctxt.Arch, r.Type)) |
| return false |
| } |
| |
| // Handle relocations found in ELF object files. |
| case 256 + objabi.RelocType(elf.R_386_PC32): |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected R_386_PC32 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 += 4 |
| return true |
| |
| case 256 + objabi.RelocType(elf.R_386_PLT32): |
| r.Type = objabi.R_PCREL |
| r.Add += 4 |
| 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_386_GOT32), 256 + objabi.RelocType(elf.R_386_GOT32X): |
| if targ.Type != sym.SDYNIMPORT { |
| // have symbol |
| if r.Off >= 2 && s.P[r.Off-2] == 0x8b { |
| // turn MOVL of GOT entry into LEAL of symbol address, relative to GOT. |
| s.P[r.Off-2] = 0x8d |
| |
| r.Type = objabi.R_GOTOFF |
| return true |
| } |
| |
| if r.Off >= 2 && s.P[r.Off-2] == 0xff && s.P[r.Off-1] == 0xb3 { |
| // turn PUSHL of GOT entry into PUSHL of symbol itself. |
| // use unnecessary SS prefix to keep instruction same length. |
| s.P[r.Off-2] = 0x36 |
| |
| s.P[r.Off-1] = 0x68 |
| r.Type = objabi.R_ADDR |
| return true |
| } |
| |
| ld.Errorf(s, "unexpected GOT reloc for non-dynamic symbol %s", targ.Name) |
| return false |
| } |
| |
| addgotsym(ctxt, targ) |
| r.Type = objabi.R_CONST // write r->add during relocsym |
| r.Sym = nil |
| r.Add += int64(targ.Got()) |
| return true |
| |
| case 256 + objabi.RelocType(elf.R_386_GOTOFF): |
| r.Type = objabi.R_GOTOFF |
| return true |
| |
| case 256 + objabi.RelocType(elf.R_386_GOTPC): |
| r.Type = objabi.R_PCREL |
| r.Sym = ctxt.Syms.Lookup(".got", 0) |
| r.Add += 4 |
| return true |
| |
| case 256 + objabi.RelocType(elf.R_386_32): |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected R_386_32 relocation for dynamic symbol %s", targ.Name) |
| } |
| r.Type = objabi.R_ADDR |
| return true |
| |
| case 512 + ld.MACHO_GENERIC_RELOC_VANILLA*2 + 0: |
| r.Type = objabi.R_ADDR |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected reloc for dynamic symbol %s", targ.Name) |
| } |
| return true |
| |
| case 512 + ld.MACHO_GENERIC_RELOC_VANILLA*2 + 1: |
| if targ.Type == sym.SDYNIMPORT { |
| addpltsym(ctxt, targ) |
| r.Sym = ctxt.Syms.Lookup(".plt", 0) |
| r.Add = int64(targ.Plt()) |
| r.Type = objabi.R_PCREL |
| return true |
| } |
| |
| r.Type = objabi.R_PCREL |
| return true |
| |
| case 512 + ld.MACHO_FAKE_GOTPCREL: |
| if targ.Type != sym.SDYNIMPORT { |
| // have symbol |
| // turn MOVL of GOT entry into LEAL of symbol itself |
| if r.Off < 2 || s.P[r.Off-2] != 0x8b { |
| ld.Errorf(s, "unexpected GOT reloc for non-dynamic symbol %s", targ.Name) |
| return false |
| } |
| |
| s.P[r.Off-2] = 0x8d |
| r.Type = objabi.R_PCREL |
| return true |
| } |
| |
| addgotsym(ctxt, targ) |
| r.Sym = ctxt.Syms.Lookup(".got", 0) |
| r.Add += int64(targ.Got()) |
| r.Type = objabi.R_PCREL |
| return true |
| } |
| |
| // Handle references to ELF symbols from our own object files. |
| if targ.Type != sym.SDYNIMPORT { |
| return true |
| } |
| switch r.Type { |
| case objabi.R_CALL, |
| objabi.R_PCREL: |
| if ctxt.LinkMode == ld.LinkExternal { |
| // External linker will do this relocation. |
| return true |
| } |
| addpltsym(ctxt, targ) |
| r.Sym = ctxt.Syms.Lookup(".plt", 0) |
| r.Add = int64(targ.Plt()) |
| return true |
| |
| case objabi.R_ADDR: |
| if s.Type != sym.SDATA { |
| break |
| } |
| if ctxt.IsELF { |
| ld.Adddynsym(ctxt, targ) |
| rel := ctxt.Syms.Lookup(".rel", 0) |
| rel.AddAddrPlus(ctxt.Arch, s, int64(r.Off)) |
| rel.AddUint32(ctxt.Arch, ld.ELF32_R_INFO(uint32(targ.Dynid), uint32(elf.R_386_32))) |
| r.Type = objabi.R_CONST // write r->add during relocsym |
| r.Sym = nil |
| return true |
| } |
| |
| if ctxt.HeadType == objabi.Hdarwin && s.Size == int64(ctxt.Arch.PtrSize) && r.Off == 0 { |
| // Mach-O relocations are a royal pain to lay out. |
| // They use a compact stateful bytecode representation |
| // that is too much bother to deal with. |
| // Instead, interpret the C declaration |
| // void *_Cvar_stderr = &stderr; |
| // as making _Cvar_stderr the name of a GOT entry |
| // for stderr. This is separate from the usual GOT entry, |
| // just in case the C code assigns to the variable, |
| // and of course it only works for single pointers, |
| // but we only need to support cgo and that's all it needs. |
| ld.Adddynsym(ctxt, targ) |
| |
| got := ctxt.Syms.Lookup(".got", 0) |
| s.Type = got.Type |
| s.Attr |= sym.AttrSubSymbol |
| s.Outer = got |
| s.Sub = got.Sub |
| got.Sub = s |
| s.Value = got.Size |
| got.AddUint32(ctxt.Arch, 0) |
| ctxt.Syms.Lookup(".linkedit.got", 0).AddUint32(ctxt.Arch, uint32(targ.Dynid)) |
| r.Type = 256 // ignore during relocsym |
| return true |
| } |
| } |
| |
| return false |
| } |
| |
| func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool { |
| ctxt.Out.Write32(uint32(sectoff)) |
| |
| elfsym := r.Xsym.ElfsymForReloc() |
| switch r.Type { |
| default: |
| return false |
| case objabi.R_ADDR: |
| if r.Siz == 4 { |
| ctxt.Out.Write32(uint32(elf.R_386_32) | uint32(elfsym)<<8) |
| } else { |
| return false |
| } |
| case objabi.R_GOTPCREL: |
| if r.Siz == 4 { |
| ctxt.Out.Write32(uint32(elf.R_386_GOTPC)) |
| if r.Xsym.Name != "_GLOBAL_OFFSET_TABLE_" { |
| ctxt.Out.Write32(uint32(sectoff)) |
| ctxt.Out.Write32(uint32(elf.R_386_GOT32) | uint32(elfsym)<<8) |
| } |
| } else { |
| return false |
| } |
| case objabi.R_CALL: |
| if r.Siz == 4 { |
| if r.Xsym.Type == sym.SDYNIMPORT { |
| ctxt.Out.Write32(uint32(elf.R_386_PLT32) | uint32(elfsym)<<8) |
| } else { |
| ctxt.Out.Write32(uint32(elf.R_386_PC32) | uint32(elfsym)<<8) |
| } |
| } else { |
| return false |
| } |
| case objabi.R_PCREL: |
| if r.Siz == 4 { |
| ctxt.Out.Write32(uint32(elf.R_386_PC32) | uint32(elfsym)<<8) |
| } else { |
| return false |
| } |
| case objabi.R_TLS_LE: |
| if r.Siz == 4 { |
| ctxt.Out.Write32(uint32(elf.R_386_TLS_LE) | uint32(elfsym)<<8) |
| } else { |
| return false |
| } |
| case objabi.R_TLS_IE: |
| if r.Siz == 4 { |
| ctxt.Out.Write32(uint32(elf.R_386_GOTPC)) |
| ctxt.Out.Write32(uint32(sectoff)) |
| ctxt.Out.Write32(uint32(elf.R_386_TLS_GOTIE) | uint32(elfsym)<<8) |
| } else { |
| return false |
| } |
| } |
| |
| return true |
| } |
| |
| func machoreloc1(arch *sys.Arch, out *ld.OutBuf, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool { |
| var v uint32 |
| |
| rs := r.Xsym |
| |
| if rs.Type == sym.SHOSTOBJ || r.Type == objabi.R_CALL { |
| if rs.Dynid < 0 { |
| ld.Errorf(s, "reloc %d (%s) to non-macho symbol %s type=%d (%s)", r.Type, sym.RelocName(arch, r.Type), rs.Name, rs.Type, rs.Type) |
| return false |
| } |
| |
| v = uint32(rs.Dynid) |
| v |= 1 << 27 // external relocation |
| } else { |
| v = uint32(rs.Sect.Extnum) |
| if v == 0 { |
| ld.Errorf(s, "reloc %d (%s) to symbol %s in non-macho section %s type=%d (%s)", r.Type, sym.RelocName(arch, r.Type), rs.Name, rs.Sect.Name, rs.Type, rs.Type) |
| return false |
| } |
| } |
| |
| switch r.Type { |
| default: |
| return false |
| case objabi.R_ADDR: |
| v |= ld.MACHO_GENERIC_RELOC_VANILLA << 28 |
| case objabi.R_CALL, |
| objabi.R_PCREL: |
| v |= 1 << 24 // pc-relative bit |
| v |= ld.MACHO_GENERIC_RELOC_VANILLA << 28 |
| } |
| |
| switch r.Siz { |
| default: |
| return false |
| case 1: |
| v |= 0 << 25 |
| case 2: |
| v |= 1 << 25 |
| case 4: |
| v |= 2 << 25 |
| case 8: |
| v |= 3 << 25 |
| } |
| |
| out.Write32(uint32(sectoff)) |
| out.Write32(v) |
| return true |
| } |
| |
| func pereloc1(arch *sys.Arch, out *ld.OutBuf, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool { |
| var v uint32 |
| |
| rs := r.Xsym |
| |
| if rs.Dynid < 0 { |
| ld.Errorf(s, "reloc %d (%s) to non-coff symbol %s type=%d (%s)", r.Type, sym.RelocName(arch, r.Type), rs.Name, rs.Type, rs.Type) |
| return false |
| } |
| |
| out.Write32(uint32(sectoff)) |
| out.Write32(uint32(rs.Dynid)) |
| |
| switch r.Type { |
| default: |
| return false |
| |
| case objabi.R_DWARFSECREF: |
| v = ld.IMAGE_REL_I386_SECREL |
| |
| case objabi.R_ADDR: |
| v = ld.IMAGE_REL_I386_DIR32 |
| |
| case objabi.R_CALL, |
| objabi.R_PCREL: |
| v = ld.IMAGE_REL_I386_REL32 |
| } |
| |
| out.Write16(uint16(v)) |
| |
| return true |
| } |
| |
| 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 { |
| log.Fatalf("unexpected relocation variant") |
| return t |
| } |
| |
| func elfsetupplt(ctxt *ld.Link) { |
| plt := ctxt.Syms.Lookup(".plt", 0) |
| got := ctxt.Syms.Lookup(".got.plt", 0) |
| if plt.Size == 0 { |
| // pushl got+4 |
| plt.AddUint8(0xff) |
| |
| plt.AddUint8(0x35) |
| plt.AddAddrPlus(ctxt.Arch, got, 4) |
| |
| // jmp *got+8 |
| plt.AddUint8(0xff) |
| |
| plt.AddUint8(0x25) |
| plt.AddAddrPlus(ctxt.Arch, got, 8) |
| |
| // zero pad |
| plt.AddUint32(ctxt.Arch, 0) |
| |
| // assume got->size == 0 too |
| got.AddAddrPlus(ctxt.Arch, ctxt.Syms.Lookup(".dynamic", 0), 0) |
| |
| got.AddUint32(ctxt.Arch, 0) |
| got.AddUint32(ctxt.Arch, 0) |
| } |
| } |
| |
| 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.plt", 0) |
| rel := ctxt.Syms.Lookup(".rel.plt", 0) |
| if plt.Size == 0 { |
| elfsetupplt(ctxt) |
| } |
| |
| // jmpq *got+size |
| plt.AddUint8(0xff) |
| |
| plt.AddUint8(0x25) |
| plt.AddAddrPlus(ctxt.Arch, got, got.Size) |
| |
| // add to got: pointer to current pos in plt |
| got.AddAddrPlus(ctxt.Arch, plt, plt.Size) |
| |
| // pushl $x |
| plt.AddUint8(0x68) |
| |
| plt.AddUint32(ctxt.Arch, uint32(rel.Size)) |
| |
| // jmp .plt |
| plt.AddUint8(0xe9) |
| |
| plt.AddUint32(ctxt.Arch, uint32(-(plt.Size + 4))) |
| |
| // rel |
| rel.AddAddrPlus(ctxt.Arch, got, got.Size-4) |
| |
| rel.AddUint32(ctxt.Arch, ld.ELF32_R_INFO(uint32(s.Dynid), uint32(elf.R_386_JMP_SLOT))) |
| |
| s.SetPlt(int32(plt.Size - 16)) |
| } else if ctxt.HeadType == objabi.Hdarwin { |
| // Same laziness as in 6l. |
| |
| plt := ctxt.Syms.Lookup(".plt", 0) |
| |
| addgotsym(ctxt, s) |
| |
| ctxt.Syms.Lookup(".linkedit.plt", 0).AddUint32(ctxt.Arch, uint32(s.Dynid)) |
| |
| // jmpq *got+size(IP) |
| s.SetPlt(int32(plt.Size)) |
| |
| plt.AddUint8(0xff) |
| plt.AddUint8(0x25) |
| plt.AddAddrPlus(ctxt.Arch, ctxt.Syms.Lookup(".got", 0), int64(s.Got())) |
| } 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.AddUint32(ctxt.Arch, 0) |
| |
| if ctxt.IsELF { |
| rel := ctxt.Syms.Lookup(".rel", 0) |
| rel.AddAddrPlus(ctxt.Arch, got, int64(s.Got())) |
| rel.AddUint32(ctxt.Arch, ld.ELF32_R_INFO(uint32(s.Dynid), uint32(elf.R_386_GLOB_DAT))) |
| } else if ctxt.HeadType == objabi.Hdarwin { |
| ctxt.Syms.Lookup(".linkedit.got", 0).AddUint32(ctxt.Arch, uint32(s.Dynid)) |
| } 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)) |
| // 0xCC is INT $3 - breakpoint instruction |
| ld.CodeblkPad(ctxt, int64(sect.Vaddr), int64(sect.Length), []byte{0xCC}) |
| 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 relrodatblk\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)) |
| |
| machlink := uint32(0) |
| if ctxt.HeadType == objabi.Hdarwin { |
| machlink = uint32(ld.Domacholink(ctxt)) |
| } |
| |
| ld.Symsize = 0 |
| ld.Spsize = 0 |
| ld.Lcsize = 0 |
| symo := uint32(0) |
| if !*ld.FlagS { |
| // TODO: rationalize |
| if ctxt.Debugvlog != 0 { |
| ctxt.Logf("%5.2f sym\n", ld.Cputime()) |
| } |
| switch ctxt.HeadType { |
| default: |
| if ctxt.IsELF { |
| symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen) |
| symo = uint32(ld.Rnd(int64(symo), int64(*ld.FlagRound))) |
| } |
| |
| case objabi.Hplan9: |
| symo = uint32(ld.Segdata.Fileoff + ld.Segdata.Filelen) |
| |
| case objabi.Hdarwin: |
| symo = uint32(ld.Segdwarf.Fileoff + uint64(ld.Rnd(int64(ld.Segdwarf.Filelen), int64(*ld.FlagRound))) + uint64(machlink)) |
| |
| case objabi.Hwindows: |
| symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen) |
| symo = uint32(ld.Rnd(int64(symo), ld.PEFILEALIGN)) |
| } |
| |
| ctxt.Out.SeekSet(int64(symo)) |
| switch ctxt.HeadType { |
| default: |
| if ctxt.IsELF { |
| 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.LinkMode == ld.LinkExternal { |
| ld.Elfemitreloc(ctxt) |
| } |
| } |
| |
| case objabi.Hplan9: |
| ld.Asmplan9sym(ctxt) |
| ctxt.Out.Flush() |
| |
| sym := ctxt.Syms.Lookup("pclntab", 0) |
| if sym != nil { |
| ld.Lcsize = int32(len(sym.P)) |
| ctxt.Out.Write(sym.P) |
| ctxt.Out.Flush() |
| } |
| |
| case objabi.Hwindows: |
| if ctxt.Debugvlog != 0 { |
| ctxt.Logf("%5.2f dwarf\n", ld.Cputime()) |
| } |
| |
| case objabi.Hdarwin: |
| if ctxt.LinkMode == ld.LinkExternal { |
| ld.Machoemitreloc(ctxt) |
| } |
| } |
| } |
| |
| if ctxt.Debugvlog != 0 { |
| ctxt.Logf("%5.2f headr\n", ld.Cputime()) |
| } |
| ctxt.Out.SeekSet(0) |
| switch ctxt.HeadType { |
| default: |
| case objabi.Hplan9: /* plan9 */ |
| magic := int32(4*11*11 + 7) |
| |
| ctxt.Out.Write32b(uint32(magic)) /* magic */ |
| ctxt.Out.Write32b(uint32(ld.Segtext.Filelen)) /* sizes */ |
| ctxt.Out.Write32b(uint32(ld.Segdata.Filelen)) |
| ctxt.Out.Write32b(uint32(ld.Segdata.Length - ld.Segdata.Filelen)) |
| ctxt.Out.Write32b(uint32(ld.Symsize)) /* nsyms */ |
| ctxt.Out.Write32b(uint32(ld.Entryvalue(ctxt))) /* va of entry */ |
| ctxt.Out.Write32b(uint32(ld.Spsize)) /* sp offsets */ |
| ctxt.Out.Write32b(uint32(ld.Lcsize)) /* line offsets */ |
| |
| case objabi.Hdarwin: |
| ld.Asmbmacho(ctxt) |
| |
| case objabi.Hlinux, |
| objabi.Hfreebsd, |
| objabi.Hnetbsd, |
| objabi.Hopenbsd, |
| objabi.Hnacl: |
| ld.Asmbelf(ctxt, int64(symo)) |
| |
| case objabi.Hwindows: |
| ld.Asmbpe(ctxt) |
| } |
| |
| ctxt.Out.Flush() |
| } |
