| // 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 arm64 |
| |
| import ( |
| "cmd/internal/objabi" |
| "cmd/internal/sys" |
| "cmd/link/internal/ld" |
| "cmd/link/internal/loader" |
| "cmd/link/internal/sym" |
| "debug/elf" |
| "fmt" |
| "log" |
| ) |
| |
| 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 |
| o := func(op uint32) { |
| initfunc.AddUint32(ctxt.Arch, op) |
| } |
| // 0000000000000000 <local.dso_init>: |
| // 0: 90000000 adrp x0, 0 <runtime.firstmoduledata> |
| // 0: R_AARCH64_ADR_PREL_PG_HI21 local.moduledata |
| // 4: 91000000 add x0, x0, #0x0 |
| // 4: R_AARCH64_ADD_ABS_LO12_NC local.moduledata |
| o(0x90000000) |
| o(0x91000000) |
| rel := initfunc.AddRel() |
| rel.Off = 0 |
| rel.Siz = 8 |
| rel.Sym = ctxt.Moduledata |
| rel.Type = objabi.R_ADDRARM64 |
| |
| // 8: 14000000 b 0 <runtime.addmoduledata> |
| // 8: R_AARCH64_CALL26 runtime.addmoduledata |
| o(0x14000000) |
| rel = initfunc.AddRel() |
| rel.Off = 8 |
| rel.Siz = 4 |
| rel.Sym = ctxt.Syms.Lookup("runtime.addmoduledata", 0) |
| rel.Type = objabi.R_CALLARM64 // Really should be R_AARCH64_JUMP26 but doesn't seem to make any difference |
| |
| 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, target *ld.Target, syms *ld.ArchSyms, s *sym.Symbol, r *sym.Reloc) bool { |
| targ := r.Sym |
| |
| switch r.Type { |
| default: |
| if r.Type >= objabi.ElfRelocOffset { |
| 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 objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_PREL32): |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected R_AARCH64_PREL32 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 objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_PREL64): |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected R_AARCH64_PREL64 relocation for dynamic symbol %s", targ.Name) |
| } |
| if targ.Type == 0 || targ.Type == sym.SXREF { |
| ld.Errorf(s, "unknown symbol %s in pcrel", targ.Name) |
| } |
| r.Type = objabi.R_PCREL |
| r.Add += 8 |
| return true |
| |
| case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_CALL26), |
| objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_JUMP26): |
| if targ.Type == sym.SDYNIMPORT { |
| addpltsym(ctxt, targ) |
| r.Sym = ctxt.Syms.Lookup(".plt", 0) |
| r.Add += int64(targ.Plt()) |
| } |
| if (targ.Type == 0 || targ.Type == sym.SXREF) && !targ.Attr.VisibilityHidden() { |
| ld.Errorf(s, "unknown symbol %s in callarm64", targ.Name) |
| } |
| r.Type = objabi.R_CALLARM64 |
| return true |
| |
| case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_ADR_GOT_PAGE), |
| objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_LD64_GOT_LO12_NC): |
| if targ.Type != sym.SDYNIMPORT { |
| // have symbol |
| // TODO: turn LDR of GOT entry into ADR of symbol itself |
| } |
| |
| // fall back to using GOT |
| // TODO: just needs relocation, no need to put in .dynsym |
| addgotsym(ctxt, targ) |
| |
| r.Type = objabi.R_ARM64_GOT |
| r.Sym = ctxt.Syms.Lookup(".got", 0) |
| r.Add += int64(targ.Got()) |
| return true |
| |
| case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_ADR_PREL_PG_HI21), |
| objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_ADD_ABS_LO12_NC): |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected relocation for dynamic symbol %s", targ.Name) |
| } |
| if targ.Type == 0 || targ.Type == sym.SXREF { |
| ld.Errorf(s, "unknown symbol %s", targ.Name) |
| } |
| r.Type = objabi.R_ARM64_PCREL |
| return true |
| |
| case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_ABS64): |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected R_AARCH64_ABS64 relocation for dynamic symbol %s", targ.Name) |
| } |
| r.Type = objabi.R_ADDR |
| if ctxt.BuildMode == ld.BuildModePIE && ctxt.LinkMode == ld.LinkInternal { |
| // For internal linking PIE, this R_ADDR relocation cannot |
| // be resolved statically. We need to generate a dynamic |
| // relocation. Let the code below handle it. |
| break |
| } |
| return true |
| |
| case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_LDST8_ABS_LO12_NC): |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected relocation for dynamic symbol %s", targ.Name) |
| } |
| r.Type = objabi.R_ARM64_LDST8 |
| return true |
| |
| case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_LDST32_ABS_LO12_NC): |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected relocation for dynamic symbol %s", targ.Name) |
| } |
| r.Type = objabi.R_ARM64_LDST32 |
| return true |
| |
| case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_LDST64_ABS_LO12_NC): |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected relocation for dynamic symbol %s", targ.Name) |
| } |
| r.Type = objabi.R_ARM64_LDST64 |
| return true |
| |
| case objabi.ElfRelocOffset + objabi.RelocType(elf.R_AARCH64_LDST128_ABS_LO12_NC): |
| if targ.Type == sym.SDYNIMPORT { |
| ld.Errorf(s, "unexpected relocation for dynamic symbol %s", targ.Name) |
| } |
| r.Type = objabi.R_ARM64_LDST128 |
| return true |
| } |
| |
| switch r.Type { |
| case objabi.R_CALL, |
| objabi.R_PCREL, |
| objabi.R_CALLARM64: |
| if targ.Type != sym.SDYNIMPORT { |
| // nothing to do, the relocation will be laid out in reloc |
| return true |
| } |
| if ctxt.LinkMode == ld.LinkExternal { |
| // External linker will do this relocation. |
| return true |
| } |
| |
| case objabi.R_ADDR: |
| if s.Type == sym.STEXT && ctxt.IsELF { |
| // The code is asking for the address of an external |
| // function. We provide it with the address of the |
| // correspondent GOT symbol. |
| addgotsym(ctxt, targ) |
| |
| r.Sym = ctxt.Syms.Lookup(".got", 0) |
| r.Add += int64(targ.Got()) |
| return true |
| } |
| |
| // Process dynamic relocations for the data sections. |
| if ctxt.BuildMode == ld.BuildModePIE && ctxt.LinkMode == ld.LinkInternal { |
| // When internally linking, generate dynamic relocations |
| // for all typical R_ADDR relocations. The exception |
| // are those R_ADDR that are created as part of generating |
| // the dynamic relocations and must be resolved statically. |
| // |
| // There are three phases relevant to understanding this: |
| // |
| // dodata() // we are here |
| // address() // symbol address assignment |
| // reloc() // resolution of static R_ADDR relocs |
| // |
| // At this point symbol addresses have not been |
| // assigned yet (as the final size of the .rela section |
| // will affect the addresses), and so we cannot write |
| // the Elf64_Rela.r_offset now. Instead we delay it |
| // until after the 'address' phase of the linker is |
| // complete. We do this via Addaddrplus, which creates |
| // a new R_ADDR relocation which will be resolved in |
| // the 'reloc' phase. |
| // |
| // These synthetic static R_ADDR relocs must be skipped |
| // now, or else we will be caught in an infinite loop |
| // of generating synthetic relocs for our synthetic |
| // relocs. |
| // |
| // Furthermore, the rela sections contain dynamic |
| // relocations with R_ADDR relocations on |
| // Elf64_Rela.r_offset. This field should contain the |
| // symbol offset as determined by reloc(), not the |
| // final dynamically linked address as a dynamic |
| // relocation would provide. |
| switch s.Name { |
| case ".dynsym", ".rela", ".rela.plt", ".got.plt", ".dynamic": |
| return false |
| } |
| } else { |
| // Either internally linking a static executable, |
| // in which case we can resolve these relocations |
| // statically in the 'reloc' phase, or externally |
| // linking, in which case the relocation will be |
| // prepared in the 'reloc' phase and passed to the |
| // external linker in the 'asmb' phase. |
| if s.Type != sym.SDATA && s.Type != sym.SRODATA { |
| break |
| } |
| } |
| |
| if ctxt.IsELF { |
| // Generate R_AARCH64_RELATIVE relocations for best |
| // efficiency in the dynamic linker. |
| // |
| // As noted above, symbol addresses have not been |
| // assigned yet, so we can't generate the final reloc |
| // entry yet. We ultimately want: |
| // |
| // r_offset = s + r.Off |
| // r_info = R_AARCH64_RELATIVE |
| // r_addend = targ + r.Add |
| // |
| // The dynamic linker will set *offset = base address + |
| // addend. |
| // |
| // AddAddrPlus is used for r_offset and r_addend to |
| // generate new R_ADDR relocations that will update |
| // these fields in the 'reloc' phase. |
| rela := ctxt.Syms.Lookup(".rela", 0) |
| rela.AddAddrPlus(ctxt.Arch, s, int64(r.Off)) |
| if r.Siz == 8 { |
| rela.AddUint64(ctxt.Arch, ld.ELF64_R_INFO(0, uint32(elf.R_AARCH64_RELATIVE))) |
| } else { |
| ld.Errorf(s, "unexpected relocation for dynamic symbol %s", targ.Name) |
| } |
| rela.AddAddrPlus(ctxt.Arch, targ, int64(r.Add)) |
| // Not mark r done here. So we still apply it statically, |
| // so in the file content we'll also have the right offset |
| // to the relocation target. So it can be examined statically |
| // (e.g. go version). |
| 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_ADDR: |
| switch r.Siz { |
| case 4: |
| ctxt.Out.Write64(uint64(elf.R_AARCH64_ABS32) | uint64(elfsym)<<32) |
| case 8: |
| ctxt.Out.Write64(uint64(elf.R_AARCH64_ABS64) | uint64(elfsym)<<32) |
| default: |
| return false |
| } |
| case objabi.R_ADDRARM64: |
| // two relocations: R_AARCH64_ADR_PREL_PG_HI21 and R_AARCH64_ADD_ABS_LO12_NC |
| ctxt.Out.Write64(uint64(elf.R_AARCH64_ADR_PREL_PG_HI21) | uint64(elfsym)<<32) |
| ctxt.Out.Write64(uint64(r.Xadd)) |
| ctxt.Out.Write64(uint64(sectoff + 4)) |
| ctxt.Out.Write64(uint64(elf.R_AARCH64_ADD_ABS_LO12_NC) | uint64(elfsym)<<32) |
| case objabi.R_ARM64_TLS_LE: |
| ctxt.Out.Write64(uint64(elf.R_AARCH64_TLSLE_MOVW_TPREL_G0) | uint64(elfsym)<<32) |
| case objabi.R_ARM64_TLS_IE: |
| ctxt.Out.Write64(uint64(elf.R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21) | uint64(elfsym)<<32) |
| ctxt.Out.Write64(uint64(r.Xadd)) |
| ctxt.Out.Write64(uint64(sectoff + 4)) |
| ctxt.Out.Write64(uint64(elf.R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC) | uint64(elfsym)<<32) |
| case objabi.R_ARM64_GOTPCREL: |
| ctxt.Out.Write64(uint64(elf.R_AARCH64_ADR_GOT_PAGE) | uint64(elfsym)<<32) |
| ctxt.Out.Write64(uint64(r.Xadd)) |
| ctxt.Out.Write64(uint64(sectoff + 4)) |
| ctxt.Out.Write64(uint64(elf.R_AARCH64_LD64_GOT_LO12_NC) | uint64(elfsym)<<32) |
| case objabi.R_CALLARM64: |
| if r.Siz != 4 { |
| return false |
| } |
| ctxt.Out.Write64(uint64(elf.R_AARCH64_CALL26) | uint64(elfsym)<<32) |
| |
| } |
| ctxt.Out.Write64(uint64(r.Xadd)) |
| |
| 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_CALLARM64 || r.Type == objabi.R_ADDRARM64 { |
| 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_ARM64_RELOC_UNSIGNED << 28 |
| case objabi.R_CALLARM64: |
| if r.Xadd != 0 { |
| ld.Errorf(s, "ld64 doesn't allow BR26 reloc with non-zero addend: %s+%d", rs.Name, r.Xadd) |
| } |
| |
| v |= 1 << 24 // pc-relative bit |
| v |= ld.MACHO_ARM64_RELOC_BRANCH26 << 28 |
| case objabi.R_ADDRARM64: |
| r.Siz = 4 |
| // Two relocation entries: MACHO_ARM64_RELOC_PAGEOFF12 MACHO_ARM64_RELOC_PAGE21 |
| // if r.Xadd is non-zero, add two MACHO_ARM64_RELOC_ADDEND. |
| if r.Xadd != 0 { |
| out.Write32(uint32(sectoff + 4)) |
| out.Write32((ld.MACHO_ARM64_RELOC_ADDEND << 28) | (2 << 25) | uint32(r.Xadd&0xffffff)) |
| } |
| out.Write32(uint32(sectoff + 4)) |
| out.Write32(v | (ld.MACHO_ARM64_RELOC_PAGEOFF12 << 28) | (2 << 25)) |
| if r.Xadd != 0 { |
| out.Write32(uint32(sectoff)) |
| out.Write32((ld.MACHO_ARM64_RELOC_ADDEND << 28) | (2 << 25) | uint32(r.Xadd&0xffffff)) |
| } |
| v |= 1 << 24 // pc-relative bit |
| v |= ld.MACHO_ARM64_RELOC_PAGE21 << 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 archreloc(target *ld.Target, syms *ld.ArchSyms, r *sym.Reloc, s *sym.Symbol, val int64) (int64, bool) { |
| if target.IsExternal() { |
| switch r.Type { |
| default: |
| return val, false |
| case objabi.R_ARM64_GOTPCREL: |
| var o1, o2 uint32 |
| if target.IsBigEndian() { |
| o1 = uint32(val >> 32) |
| o2 = uint32(val) |
| } else { |
| o1 = uint32(val) |
| o2 = uint32(val >> 32) |
| } |
| // Any relocation against a function symbol is redirected to |
| // be against a local symbol instead (see putelfsym in |
| // symtab.go) but unfortunately the system linker was buggy |
| // when confronted with a R_AARCH64_ADR_GOT_PAGE relocation |
| // against a local symbol until May 2015 |
| // (https://sourceware.org/bugzilla/show_bug.cgi?id=18270). So |
| // we convert the adrp; ld64 + R_ARM64_GOTPCREL into adrp; |
| // add + R_ADDRARM64. |
| if !(r.Sym.IsFileLocal() || r.Sym.Attr.VisibilityHidden() || r.Sym.Attr.Local()) && r.Sym.Type == sym.STEXT && target.IsDynlinkingGo() { |
| if o2&0xffc00000 != 0xf9400000 { |
| ld.Errorf(s, "R_ARM64_GOTPCREL against unexpected instruction %x", o2) |
| } |
| o2 = 0x91000000 | (o2 & 0x000003ff) |
| r.Type = objabi.R_ADDRARM64 |
| } |
| if target.IsBigEndian() { |
| val = int64(o1)<<32 | int64(o2) |
| } else { |
| val = int64(o2)<<32 | int64(o1) |
| } |
| fallthrough |
| case objabi.R_ADDRARM64: |
| r.Done = false |
| |
| // set up addend for eventual relocation via outer symbol. |
| rs := r.Sym |
| r.Xadd = r.Add |
| for rs.Outer != nil { |
| r.Xadd += ld.Symaddr(rs) - ld.Symaddr(rs.Outer) |
| rs = rs.Outer |
| } |
| |
| if rs.Type != sym.SHOSTOBJ && rs.Type != sym.SDYNIMPORT && rs.Sect == nil { |
| ld.Errorf(s, "missing section for %s", rs.Name) |
| } |
| r.Xsym = rs |
| |
| // Note: ld64 currently has a bug that any non-zero addend for BR26 relocation |
| // will make the linking fail because it thinks the code is not PIC even though |
| // the BR26 relocation should be fully resolved at link time. |
| // That is the reason why the next if block is disabled. When the bug in ld64 |
| // is fixed, we can enable this block and also enable duff's device in cmd/7g. |
| if false && target.IsDarwin() { |
| var o0, o1 uint32 |
| |
| if target.IsBigEndian() { |
| o0 = uint32(val >> 32) |
| o1 = uint32(val) |
| } else { |
| o0 = uint32(val) |
| o1 = uint32(val >> 32) |
| } |
| // Mach-O wants the addend to be encoded in the instruction |
| // Note that although Mach-O supports ARM64_RELOC_ADDEND, it |
| // can only encode 24-bit of signed addend, but the instructions |
| // supports 33-bit of signed addend, so we always encode the |
| // addend in place. |
| o0 |= (uint32((r.Xadd>>12)&3) << 29) | (uint32((r.Xadd>>12>>2)&0x7ffff) << 5) |
| o1 |= uint32(r.Xadd&0xfff) << 10 |
| r.Xadd = 0 |
| |
| // when laid out, the instruction order must always be o1, o2. |
| if target.IsBigEndian() { |
| val = int64(o0)<<32 | int64(o1) |
| } else { |
| val = int64(o1)<<32 | int64(o0) |
| } |
| } |
| |
| return val, true |
| case objabi.R_CALLARM64, |
| objabi.R_ARM64_TLS_LE, |
| objabi.R_ARM64_TLS_IE: |
| r.Done = false |
| r.Xsym = r.Sym |
| r.Xadd = r.Add |
| return val, true |
| } |
| } |
| |
| switch r.Type { |
| case objabi.R_CONST: |
| return r.Add, true |
| |
| case objabi.R_GOTOFF: |
| return ld.Symaddr(r.Sym) + r.Add - ld.Symaddr(syms.GOT), true |
| |
| case objabi.R_ADDRARM64: |
| t := ld.Symaddr(r.Sym) + r.Add - ((s.Value + int64(r.Off)) &^ 0xfff) |
| if t >= 1<<32 || t < -1<<32 { |
| ld.Errorf(s, "program too large, address relocation distance = %d", t) |
| } |
| |
| var o0, o1 uint32 |
| |
| if target.IsBigEndian() { |
| o0 = uint32(val >> 32) |
| o1 = uint32(val) |
| } else { |
| o0 = uint32(val) |
| o1 = uint32(val >> 32) |
| } |
| |
| o0 |= (uint32((t>>12)&3) << 29) | (uint32((t>>12>>2)&0x7ffff) << 5) |
| o1 |= uint32(t&0xfff) << 10 |
| |
| // when laid out, the instruction order must always be o1, o2. |
| if target.IsBigEndian() { |
| return int64(o0)<<32 | int64(o1), true |
| } |
| return int64(o1)<<32 | int64(o0), true |
| |
| case objabi.R_ARM64_TLS_LE: |
| r.Done = false |
| if target.IsDarwin() { |
| ld.Errorf(s, "TLS reloc on unsupported OS %v", target.HeadType) |
| } |
| // The TCB is two pointers. This is not documented anywhere, but is |
| // de facto part of the ABI. |
| v := r.Sym.Value + int64(2*target.Arch.PtrSize) |
| if v < 0 || v >= 32678 { |
| ld.Errorf(s, "TLS offset out of range %d", v) |
| } |
| return val | (v << 5), true |
| |
| case objabi.R_ARM64_TLS_IE: |
| if target.IsPIE() && target.IsElf() { |
| // We are linking the final executable, so we |
| // can optimize any TLS IE relocation to LE. |
| r.Done = false |
| if !target.IsLinux() { |
| ld.Errorf(s, "TLS reloc on unsupported OS %v", target.HeadType) |
| } |
| |
| // The TCB is two pointers. This is not documented anywhere, but is |
| // de facto part of the ABI. |
| v := ld.Symaddr(r.Sym) + int64(2*target.Arch.PtrSize) + r.Add |
| if v < 0 || v >= 32678 { |
| ld.Errorf(s, "TLS offset out of range %d", v) |
| } |
| |
| var o0, o1 uint32 |
| if target.IsBigEndian() { |
| o0 = uint32(val >> 32) |
| o1 = uint32(val) |
| } else { |
| o0 = uint32(val) |
| o1 = uint32(val >> 32) |
| } |
| |
| // R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21 |
| // turn ADRP to MOVZ |
| o0 = 0xd2a00000 | uint32(o0&0x1f) | (uint32((v>>16)&0xffff) << 5) |
| // R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC |
| // turn LD64 to MOVK |
| if v&3 != 0 { |
| ld.Errorf(s, "invalid address: %x for relocation type: R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC", v) |
| } |
| o1 = 0xf2800000 | uint32(o1&0x1f) | (uint32(v&0xffff) << 5) |
| |
| // when laid out, the instruction order must always be o0, o1. |
| if target.IsBigEndian() { |
| return int64(o0)<<32 | int64(o1), true |
| } |
| return int64(o1)<<32 | int64(o0), true |
| } else { |
| log.Fatalf("cannot handle R_ARM64_TLS_IE (sym %s) when linking internally", s.Name) |
| } |
| |
| case objabi.R_CALLARM64: |
| var t int64 |
| if r.Sym.Type == sym.SDYNIMPORT { |
| t = (ld.Symaddr(syms.PLT) + r.Add) - (s.Value + int64(r.Off)) |
| } else { |
| t = (ld.Symaddr(r.Sym) + r.Add) - (s.Value + int64(r.Off)) |
| } |
| if t >= 1<<27 || t < -1<<27 { |
| ld.Errorf(s, "program too large, call relocation distance = %d", t) |
| } |
| return val | ((t >> 2) & 0x03ffffff), true |
| |
| case objabi.R_ARM64_GOT: |
| if s.P[r.Off+3]&0x9f == 0x90 { |
| // R_AARCH64_ADR_GOT_PAGE |
| // patch instruction: adrp |
| t := ld.Symaddr(r.Sym) + r.Add - ((s.Value + int64(r.Off)) &^ 0xfff) |
| if t >= 1<<32 || t < -1<<32 { |
| ld.Errorf(s, "program too large, address relocation distance = %d", t) |
| } |
| var o0 uint32 |
| o0 |= (uint32((t>>12)&3) << 29) | (uint32((t>>12>>2)&0x7ffff) << 5) |
| return val | int64(o0), true |
| } else if s.P[r.Off+3] == 0xf9 { |
| // R_AARCH64_LD64_GOT_LO12_NC |
| // patch instruction: ldr |
| t := ld.Symaddr(r.Sym) + r.Add - ((s.Value + int64(r.Off)) &^ 0xfff) |
| if t&7 != 0 { |
| ld.Errorf(s, "invalid address: %x for relocation type: R_AARCH64_LD64_GOT_LO12_NC", t) |
| } |
| var o1 uint32 |
| o1 |= uint32(t&0xfff) << (10 - 3) |
| return val | int64(uint64(o1)), true |
| } else { |
| ld.Errorf(s, "unsupported instruction for %v R_GOTARM64", s.P[r.Off:r.Off+4]) |
| } |
| |
| case objabi.R_ARM64_PCREL: |
| if s.P[r.Off+3]&0x9f == 0x90 { |
| // R_AARCH64_ADR_PREL_PG_HI21 |
| // patch instruction: adrp |
| t := ld.Symaddr(r.Sym) + r.Add - ((s.Value + int64(r.Off)) &^ 0xfff) |
| if t >= 1<<32 || t < -1<<32 { |
| ld.Errorf(s, "program too large, address relocation distance = %d", t) |
| } |
| o0 := (uint32((t>>12)&3) << 29) | (uint32((t>>12>>2)&0x7ffff) << 5) |
| return val | int64(o0), true |
| } else if s.P[r.Off+3]&0x91 == 0x91 { |
| // R_AARCH64_ADD_ABS_LO12_NC |
| // patch instruction: add |
| t := ld.Symaddr(r.Sym) + r.Add - ((s.Value + int64(r.Off)) &^ 0xfff) |
| o1 := uint32(t&0xfff) << 10 |
| return val | int64(o1), true |
| } else { |
| ld.Errorf(s, "unsupported instruction for %v R_PCRELARM64", s.P[r.Off:r.Off+4]) |
| } |
| |
| case objabi.R_ARM64_LDST8: |
| t := ld.Symaddr(r.Sym) + r.Add - ((s.Value + int64(r.Off)) &^ 0xfff) |
| o0 := uint32(t&0xfff) << 10 |
| return val | int64(o0), true |
| |
| case objabi.R_ARM64_LDST32: |
| t := ld.Symaddr(r.Sym) + r.Add - ((s.Value + int64(r.Off)) &^ 0xfff) |
| if t&3 != 0 { |
| ld.Errorf(s, "invalid address: %x for relocation type: R_AARCH64_LDST32_ABS_LO12_NC", t) |
| } |
| o0 := (uint32(t&0xfff) >> 2) << 10 |
| return val | int64(o0), true |
| |
| case objabi.R_ARM64_LDST64: |
| t := ld.Symaddr(r.Sym) + r.Add - ((s.Value + int64(r.Off)) &^ 0xfff) |
| if t&7 != 0 { |
| ld.Errorf(s, "invalid address: %x for relocation type: R_AARCH64_LDST64_ABS_LO12_NC", t) |
| } |
| o0 := (uint32(t&0xfff) >> 3) << 10 |
| return val | int64(o0), true |
| |
| case objabi.R_ARM64_LDST128: |
| t := ld.Symaddr(r.Sym) + r.Add - ((s.Value + int64(r.Off)) &^ 0xfff) |
| if t&15 != 0 { |
| ld.Errorf(s, "invalid address: %x for relocation type: R_AARCH64_LDST128_ABS_LO12_NC", t) |
| } |
| o0 := (uint32(t&0xfff) >> 4) << 10 |
| return val | int64(o0), true |
| } |
| |
| return val, false |
| } |
| |
| func archrelocvariant(target *ld.Target, syms *ld.ArchSyms, r *sym.Reloc, s *sym.Symbol, t int64) int64 { |
| log.Fatalf("unexpected relocation variant") |
| return -1 |
| } |
| |
| func elfsetupplt(ctxt *ld.Link, plt, gotplt *loader.SymbolBuilder, dynamic loader.Sym) { |
| if plt.Size() == 0 { |
| // stp x16, x30, [sp, #-16]! |
| // identifying information |
| plt.AddUint32(ctxt.Arch, 0xa9bf7bf0) |
| |
| // the following two instructions (adrp + ldr) load *got[2] into x17 |
| // adrp x16, &got[0] |
| plt.AddSymRef(ctxt.Arch, gotplt.Sym(), 16, objabi.R_ARM64_GOT, 4) |
| plt.SetUint32(ctxt.Arch, plt.Size()-4, 0x90000010) |
| |
| // <imm> is the offset value of &got[2] to &got[0], the same below |
| // ldr x17, [x16, <imm>] |
| plt.AddSymRef(ctxt.Arch, gotplt.Sym(), 16, objabi.R_ARM64_GOT, 4) |
| plt.SetUint32(ctxt.Arch, plt.Size()-4, 0xf9400211) |
| |
| // add x16, x16, <imm> |
| plt.AddSymRef(ctxt.Arch, gotplt.Sym(), 16, objabi.R_ARM64_PCREL, 4) |
| plt.SetUint32(ctxt.Arch, plt.Size()-4, 0x91000210) |
| |
| // br x17 |
| plt.AddUint32(ctxt.Arch, 0xd61f0220) |
| |
| // 3 nop for place holder |
| plt.AddUint32(ctxt.Arch, 0xd503201f) |
| plt.AddUint32(ctxt.Arch, 0xd503201f) |
| plt.AddUint32(ctxt.Arch, 0xd503201f) |
| |
| // check gotplt.size == 0 |
| if gotplt.Size() != 0 { |
| ctxt.Errorf(gotplt.Sym(), "got.plt is not empty at the very beginning") |
| } |
| gotplt.AddAddrPlus(ctxt.Arch, dynamic, 0) |
| |
| gotplt.AddUint64(ctxt.Arch, 0) |
| gotplt.AddUint64(ctxt.Arch, 0) |
| } |
| } |
| |
| func addpltsym(ctxt *ld.Link, s *sym.Symbol) { |
| if s.Plt() >= 0 { |
| return |
| } |
| |
| ld.Adddynsym(&ctxt.Target, &ctxt.ArchSyms, s) |
| |
| if ctxt.IsELF { |
| plt := ctxt.Syms.Lookup(".plt", 0) |
| gotplt := ctxt.Syms.Lookup(".got.plt", 0) |
| rela := ctxt.Syms.Lookup(".rela.plt", 0) |
| if plt.Size == 0 { |
| panic("plt is not set up") |
| } |
| |
| // adrp x16, &got.plt[0] |
| plt.AddAddrPlus4(gotplt, gotplt.Size) |
| plt.SetUint32(ctxt.Arch, plt.Size-4, 0x90000010) |
| plt.R[len(plt.R)-1].Type = objabi.R_ARM64_GOT |
| |
| // <offset> is the offset value of &got.plt[n] to &got.plt[0] |
| // ldr x17, [x16, <offset>] |
| plt.AddAddrPlus4(gotplt, gotplt.Size) |
| plt.SetUint32(ctxt.Arch, plt.Size-4, 0xf9400211) |
| plt.R[len(plt.R)-1].Type = objabi.R_ARM64_GOT |
| |
| // add x16, x16, <offset> |
| plt.AddAddrPlus4(gotplt, gotplt.Size) |
| plt.SetUint32(ctxt.Arch, plt.Size-4, 0x91000210) |
| plt.R[len(plt.R)-1].Type = objabi.R_ARM64_PCREL |
| |
| // br x17 |
| plt.AddUint32(ctxt.Arch, 0xd61f0220) |
| |
| // add to got.plt: pointer to plt[0] |
| gotplt.AddAddrPlus(ctxt.Arch, plt, 0) |
| |
| // rela |
| rela.AddAddrPlus(ctxt.Arch, gotplt, gotplt.Size-8) |
| rela.AddUint64(ctxt.Arch, ld.ELF64_R_INFO(uint32(s.Dynid), uint32(elf.R_AARCH64_JUMP_SLOT))) |
| rela.AddUint64(ctxt.Arch, 0) |
| |
| s.SetPlt(int32(plt.Size - 16)) |
| } else { |
| ld.Errorf(s, "addpltsym: unsupported binary format") |
| } |
| } |
| |
| func addgotsym(ctxt *ld.Link, s *sym.Symbol) { |
| if s.Got() >= 0 { |
| return |
| } |
| |
| ld.Adddynsym(&ctxt.Target, &ctxt.ArchSyms, 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_AARCH64_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) { |
| machlink := uint32(0) |
| if ctxt.HeadType == objabi.Hdarwin { |
| machlink = uint32(ld.Domacholink(ctxt)) |
| } |
| |
| /* output symbol table */ |
| ld.Symsize = 0 |
| |
| ld.Lcsize = 0 |
| symo := uint32(0) |
| if !*ld.FlagS { |
| // TODO: rationalize |
| 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)) |
| } |
| |
| ctxt.Out.SeekSet(int64(symo)) |
| switch ctxt.HeadType { |
| default: |
| if ctxt.IsELF { |
| 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.Hdarwin: |
| if ctxt.LinkMode == ld.LinkExternal { |
| ld.Machoemitreloc(ctxt) |
| } |
| } |
| } |
| |
| ctxt.Out.SeekSet(0) |
| switch ctxt.HeadType { |
| default: |
| case objabi.Hplan9: /* plan 9 */ |
| ctxt.Out.Write32(0x647) /* magic */ |
| ctxt.Out.Write32(uint32(ld.Segtext.Filelen)) /* sizes */ |
| ctxt.Out.Write32(uint32(ld.Segdata.Filelen)) |
| ctxt.Out.Write32(uint32(ld.Segdata.Length - ld.Segdata.Filelen)) |
| ctxt.Out.Write32(uint32(ld.Symsize)) /* nsyms */ |
| ctxt.Out.Write32(uint32(ld.Entryvalue(ctxt))) /* va of entry */ |
| ctxt.Out.Write32(0) |
| ctxt.Out.Write32(uint32(ld.Lcsize)) |
| |
| case objabi.Hlinux, |
| objabi.Hfreebsd, |
| objabi.Hnetbsd, |
| objabi.Hopenbsd: |
| ld.Asmbelf(ctxt, int64(symo)) |
| |
| case objabi.Hdarwin: |
| ld.Asmbmacho(ctxt) |
| } |
| |
| 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)) |
| } |
| } |
