| // Do not edit. Bootstrap copy of /tmp/go/src/cmd/link/internal/ld/data.go |
| |
| //line /tmp/go/src/cmd/link/internal/ld/data.go:1 |
| // Derived from Inferno utils/6l/obj.c and utils/6l/span.c |
| // http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.c |
| // http://code.google.com/p/inferno-os/source/browse/utils/6l/span.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 ld |
| |
| import ( |
| "bootstrap/internal/gcprog" |
| "bootstrap/internal/obj" |
| "fmt" |
| "log" |
| "os" |
| "strconv" |
| "strings" |
| ) |
| |
| func Symgrow(ctxt *Link, s *LSym, siz int64) { |
| if int64(int(siz)) != siz { |
| log.Fatalf("symgrow size %d too long", siz) |
| } |
| if int64(len(s.P)) >= siz { |
| return |
| } |
| for cap(s.P) < int(siz) { |
| s.P = append(s.P[:len(s.P)], 0) |
| } |
| s.P = s.P[:siz] |
| } |
| |
| func Addrel(s *LSym) *Reloc { |
| s.R = append(s.R, Reloc{}) |
| return &s.R[len(s.R)-1] |
| } |
| |
| func setuintxx(ctxt *Link, s *LSym, off int64, v uint64, wid int64) int64 { |
| if s.Type == 0 { |
| s.Type = obj.SDATA |
| } |
| s.Reachable = true |
| if s.Size < off+wid { |
| s.Size = off + wid |
| Symgrow(ctxt, s, s.Size) |
| } |
| |
| switch wid { |
| case 1: |
| s.P[off] = uint8(v) |
| case 2: |
| ctxt.Arch.ByteOrder.PutUint16(s.P[off:], uint16(v)) |
| case 4: |
| ctxt.Arch.ByteOrder.PutUint32(s.P[off:], uint32(v)) |
| case 8: |
| ctxt.Arch.ByteOrder.PutUint64(s.P[off:], uint64(v)) |
| } |
| |
| return off + wid |
| } |
| |
| func adduintxx(ctxt *Link, s *LSym, v uint64, wid int) int64 { |
| off := s.Size |
| setuintxx(ctxt, s, off, v, int64(wid)) |
| return off |
| } |
| |
| func Adduint8(ctxt *Link, s *LSym, v uint8) int64 { |
| return adduintxx(ctxt, s, uint64(v), 1) |
| } |
| |
| func Adduint16(ctxt *Link, s *LSym, v uint16) int64 { |
| return adduintxx(ctxt, s, uint64(v), 2) |
| } |
| |
| func Adduint32(ctxt *Link, s *LSym, v uint32) int64 { |
| return adduintxx(ctxt, s, uint64(v), 4) |
| } |
| |
| func Adduint64(ctxt *Link, s *LSym, v uint64) int64 { |
| return adduintxx(ctxt, s, v, 8) |
| } |
| |
| func adduint(ctxt *Link, s *LSym, v uint64) int64 { |
| return adduintxx(ctxt, s, v, Thearch.Intsize) |
| } |
| |
| func setuint8(ctxt *Link, s *LSym, r int64, v uint8) int64 { |
| return setuintxx(ctxt, s, r, uint64(v), 1) |
| } |
| |
| func setuint32(ctxt *Link, s *LSym, r int64, v uint32) int64 { |
| return setuintxx(ctxt, s, r, uint64(v), 4) |
| } |
| |
| func Addaddrplus(ctxt *Link, s *LSym, t *LSym, add int64) int64 { |
| if s.Type == 0 { |
| s.Type = obj.SDATA |
| } |
| s.Reachable = true |
| i := s.Size |
| s.Size += int64(ctxt.Arch.Ptrsize) |
| Symgrow(ctxt, s, s.Size) |
| r := Addrel(s) |
| r.Sym = t |
| r.Off = int32(i) |
| r.Siz = uint8(ctxt.Arch.Ptrsize) |
| r.Type = obj.R_ADDR |
| r.Add = add |
| return i + int64(r.Siz) |
| } |
| |
| func Addpcrelplus(ctxt *Link, s *LSym, t *LSym, add int64) int64 { |
| if s.Type == 0 { |
| s.Type = obj.SDATA |
| } |
| s.Reachable = true |
| i := s.Size |
| s.Size += 4 |
| Symgrow(ctxt, s, s.Size) |
| r := Addrel(s) |
| r.Sym = t |
| r.Off = int32(i) |
| r.Add = add |
| r.Type = obj.R_PCREL |
| r.Siz = 4 |
| return i + int64(r.Siz) |
| } |
| |
| func Addaddr(ctxt *Link, s *LSym, t *LSym) int64 { |
| return Addaddrplus(ctxt, s, t, 0) |
| } |
| |
| func setaddrplus(ctxt *Link, s *LSym, off int64, t *LSym, add int64) int64 { |
| if s.Type == 0 { |
| s.Type = obj.SDATA |
| } |
| s.Reachable = true |
| if off+int64(ctxt.Arch.Ptrsize) > s.Size { |
| s.Size = off + int64(ctxt.Arch.Ptrsize) |
| Symgrow(ctxt, s, s.Size) |
| } |
| |
| r := Addrel(s) |
| r.Sym = t |
| r.Off = int32(off) |
| r.Siz = uint8(ctxt.Arch.Ptrsize) |
| r.Type = obj.R_ADDR |
| r.Add = add |
| return off + int64(r.Siz) |
| } |
| |
| func setaddr(ctxt *Link, s *LSym, off int64, t *LSym) int64 { |
| return setaddrplus(ctxt, s, off, t, 0) |
| } |
| |
| func addsize(ctxt *Link, s *LSym, t *LSym) int64 { |
| if s.Type == 0 { |
| s.Type = obj.SDATA |
| } |
| s.Reachable = true |
| i := s.Size |
| s.Size += int64(ctxt.Arch.Ptrsize) |
| Symgrow(ctxt, s, s.Size) |
| r := Addrel(s) |
| r.Sym = t |
| r.Off = int32(i) |
| r.Siz = uint8(ctxt.Arch.Ptrsize) |
| r.Type = obj.R_SIZE |
| return i + int64(r.Siz) |
| } |
| |
| func addaddrplus4(ctxt *Link, s *LSym, t *LSym, add int64) int64 { |
| if s.Type == 0 { |
| s.Type = obj.SDATA |
| } |
| s.Reachable = true |
| i := s.Size |
| s.Size += 4 |
| Symgrow(ctxt, s, s.Size) |
| r := Addrel(s) |
| r.Sym = t |
| r.Off = int32(i) |
| r.Siz = 4 |
| r.Type = obj.R_ADDR |
| r.Add = add |
| return i + int64(r.Siz) |
| } |
| |
| /* |
| * divide-and-conquer list-link |
| * sort of LSym* structures. |
| * Used for the data block. |
| */ |
| func datcmp(s1 *LSym, s2 *LSym) int { |
| if s1.Type != s2.Type { |
| return int(s1.Type) - int(s2.Type) |
| } |
| |
| // For ppc64, we want to interleave the .got and .toc sections |
| // from input files. Both are type SELFGOT, so in that case |
| // fall through to the name comparison (conveniently, .got |
| // sorts before .toc). |
| if s1.Type != obj.SELFGOT && s1.Size != s2.Size { |
| if s1.Size < s2.Size { |
| return -1 |
| } |
| return +1 |
| } |
| |
| return stringsCompare(s1.Name, s2.Name) |
| } |
| |
| func listnextp(s *LSym) **LSym { |
| return &s.Next |
| } |
| |
| func listsubp(s *LSym) **LSym { |
| return &s.Sub |
| } |
| |
| func listsort(l *LSym, cmp func(*LSym, *LSym) int, nextp func(*LSym) **LSym) *LSym { |
| if l == nil || *nextp(l) == nil { |
| return l |
| } |
| |
| l1 := l |
| l2 := l |
| for { |
| l2 = *nextp(l2) |
| if l2 == nil { |
| break |
| } |
| l2 = *nextp(l2) |
| if l2 == nil { |
| break |
| } |
| l1 = *nextp(l1) |
| } |
| |
| l2 = *nextp(l1) |
| *nextp(l1) = nil |
| l1 = listsort(l, cmp, nextp) |
| l2 = listsort(l2, cmp, nextp) |
| |
| /* set up lead element */ |
| if cmp(l1, l2) < 0 { |
| l = l1 |
| l1 = *nextp(l1) |
| } else { |
| l = l2 |
| l2 = *nextp(l2) |
| } |
| |
| le := l |
| |
| for { |
| if l1 == nil { |
| for l2 != nil { |
| *nextp(le) = l2 |
| le = l2 |
| l2 = *nextp(l2) |
| } |
| |
| *nextp(le) = nil |
| break |
| } |
| |
| if l2 == nil { |
| for l1 != nil { |
| *nextp(le) = l1 |
| le = l1 |
| l1 = *nextp(l1) |
| } |
| |
| break |
| } |
| |
| if cmp(l1, l2) < 0 { |
| *nextp(le) = l1 |
| le = l1 |
| l1 = *nextp(l1) |
| } else { |
| *nextp(le) = l2 |
| le = l2 |
| l2 = *nextp(l2) |
| } |
| } |
| |
| *nextp(le) = nil |
| return l |
| } |
| |
| func relocsym(s *LSym) { |
| var r *Reloc |
| var rs *LSym |
| var i16 int16 |
| var off int32 |
| var siz int32 |
| var fl int32 |
| var o int64 |
| |
| Ctxt.Cursym = s |
| for ri := int32(0); ri < int32(len(s.R)); ri++ { |
| r = &s.R[ri] |
| r.Done = 1 |
| off = r.Off |
| siz = int32(r.Siz) |
| if off < 0 || off+siz > int32(len(s.P)) { |
| Diag("%s: invalid relocation %d+%d not in [%d,%d)", s.Name, off, siz, 0, len(s.P)) |
| continue |
| } |
| |
| if r.Sym != nil && (r.Sym.Type&(obj.SMASK|obj.SHIDDEN) == 0 || r.Sym.Type&obj.SMASK == obj.SXREF) { |
| // When putting the runtime but not main into a shared library |
| // these symbols are undefined and that's OK. |
| if Buildmode == BuildmodeShared && (r.Sym.Name == "main.main" || r.Sym.Name == "main.init") { |
| r.Sym.Type = obj.SDYNIMPORT |
| } else { |
| Diag("%s: not defined", r.Sym.Name) |
| continue |
| } |
| } |
| |
| if r.Type >= 256 { |
| continue |
| } |
| if r.Siz == 0 { // informational relocation - no work to do |
| continue |
| } |
| |
| // We need to be able to reference dynimport symbols when linking against |
| // shared libraries, and Solaris needs it always |
| if HEADTYPE != obj.Hsolaris && r.Sym != nil && r.Sym.Type == obj.SDYNIMPORT && !DynlinkingGo() { |
| Diag("unhandled relocation for %s (type %d rtype %d)", r.Sym.Name, r.Sym.Type, r.Type) |
| } |
| if r.Sym != nil && r.Sym.Type != obj.STLSBSS && !r.Sym.Reachable { |
| Diag("unreachable sym in relocation: %s %s", s.Name, r.Sym.Name) |
| } |
| |
| // Android emulates runtime.tlsg as a regular variable. |
| if r.Type == obj.R_TLS && goos == "android" { |
| r.Type = obj.R_ADDR |
| } |
| |
| switch r.Type { |
| default: |
| o = 0 |
| if Thearch.Archreloc(r, s, &o) < 0 { |
| Diag("unknown reloc %d", r.Type) |
| } |
| |
| case obj.R_TLS: |
| if Linkmode == LinkExternal && Iself && HEADTYPE != obj.Hopenbsd { |
| r.Done = 0 |
| r.Sym = Ctxt.Tlsg |
| r.Xsym = Ctxt.Tlsg |
| r.Xadd = r.Add |
| o = r.Add |
| break |
| } |
| if Linkmode == LinkInternal && Iself && Thearch.Thechar == '5' { |
| // On ELF ARM, the thread pointer is 8 bytes before |
| // the start of the thread-local data block, so add 8 |
| // to the actual TLS offset (r->sym->value). |
| // This 8 seems to be a fundamental constant of |
| // ELF on ARM (or maybe Glibc on ARM); it is not |
| // related to the fact that our own TLS storage happens |
| // to take up 8 bytes. |
| o = 8 + r.Sym.Value |
| |
| break |
| } |
| |
| r.Done = 0 |
| o = 0 |
| if Thearch.Thechar != '6' { |
| o = r.Add |
| } |
| |
| case obj.R_TLS_LE: |
| if Linkmode == LinkExternal && Iself && HEADTYPE != obj.Hopenbsd { |
| r.Done = 0 |
| r.Sym = Ctxt.Tlsg |
| r.Xsym = Ctxt.Tlsg |
| r.Xadd = r.Add |
| o = 0 |
| if Thearch.Thechar != '6' { |
| o = r.Add |
| } |
| break |
| } |
| |
| if Iself || Ctxt.Headtype == obj.Hplan9 || Ctxt.Headtype == obj.Hdarwin { |
| o = int64(Ctxt.Tlsoffset) + r.Add |
| } else if Ctxt.Headtype == obj.Hwindows { |
| o = r.Add |
| } else { |
| log.Fatalf("unexpected R_TLS_LE relocation for %s", Headstr(Ctxt.Headtype)) |
| } |
| |
| case obj.R_TLS_IE: |
| if Linkmode == LinkExternal && Iself && HEADTYPE != obj.Hopenbsd { |
| r.Done = 0 |
| r.Sym = Ctxt.Tlsg |
| r.Xsym = Ctxt.Tlsg |
| r.Xadd = r.Add |
| o = 0 |
| if Thearch.Thechar != '6' { |
| o = r.Add |
| } |
| break |
| } |
| log.Fatalf("cannot handle R_TLS_IE when linking internally") |
| |
| case obj.R_ADDR: |
| if Linkmode == LinkExternal && r.Sym.Type != obj.SCONST { |
| r.Done = 0 |
| |
| // set up addend for eventual relocation via outer symbol. |
| rs = r.Sym |
| |
| r.Xadd = r.Add |
| for rs.Outer != nil { |
| r.Xadd += Symaddr(rs) - Symaddr(rs.Outer) |
| rs = rs.Outer |
| } |
| |
| if rs.Type != obj.SHOSTOBJ && rs.Type != obj.SDYNIMPORT && rs.Sect == nil { |
| Diag("missing section for %s", rs.Name) |
| } |
| r.Xsym = rs |
| |
| o = r.Xadd |
| if Iself { |
| if Thearch.Thechar == '6' { |
| o = 0 |
| } |
| } else if HEADTYPE == obj.Hdarwin { |
| // ld64 for arm64 has a bug where if the address pointed to by o exists in the |
| // symbol table (dynid >= 0), or is inside a symbol that exists in the symbol |
| // table, then it will add o twice into the relocated value. |
| // The workaround is that on arm64 don't ever add symaddr to o and always use |
| // extern relocation by requiring rs->dynid >= 0. |
| if rs.Type != obj.SHOSTOBJ { |
| if Thearch.Thechar == '7' && rs.Dynid < 0 { |
| Diag("R_ADDR reloc to %s+%d is not supported on darwin/arm64", rs.Name, o) |
| } |
| if Thearch.Thechar != '7' { |
| o += Symaddr(rs) |
| } |
| } |
| } else if HEADTYPE == obj.Hwindows { |
| // nothing to do |
| } else { |
| Diag("unhandled pcrel relocation for %s", headstring) |
| } |
| |
| break |
| } |
| |
| o = Symaddr(r.Sym) + r.Add |
| |
| // On amd64, 4-byte offsets will be sign-extended, so it is impossible to |
| // access more than 2GB of static data; fail at link time is better than |
| // fail at runtime. See https://golang.org/issue/7980. |
| // Instead of special casing only amd64, we treat this as an error on all |
| // 64-bit architectures so as to be future-proof. |
| if int32(o) < 0 && Thearch.Ptrsize > 4 && siz == 4 { |
| Diag("non-pc-relative relocation address is too big: %#x (%#x + %#x)", uint64(o), Symaddr(r.Sym), r.Add) |
| errorexit() |
| } |
| |
| // r->sym can be null when CALL $(constant) is transformed from absolute PC to relative PC call. |
| case obj.R_CALL, obj.R_GOTPCREL, obj.R_PCREL: |
| if Linkmode == LinkExternal && r.Sym != nil && r.Sym.Type != obj.SCONST && (r.Sym.Sect != Ctxt.Cursym.Sect || r.Type == obj.R_GOTPCREL) { |
| r.Done = 0 |
| |
| // set up addend for eventual relocation via outer symbol. |
| rs = r.Sym |
| |
| r.Xadd = r.Add |
| for rs.Outer != nil { |
| r.Xadd += Symaddr(rs) - Symaddr(rs.Outer) |
| rs = rs.Outer |
| } |
| |
| r.Xadd -= int64(r.Siz) // relative to address after the relocated chunk |
| if rs.Type != obj.SHOSTOBJ && rs.Type != obj.SDYNIMPORT && rs.Sect == nil { |
| Diag("missing section for %s", rs.Name) |
| } |
| r.Xsym = rs |
| |
| o = r.Xadd |
| if Iself { |
| if Thearch.Thechar == '6' { |
| o = 0 |
| } |
| } else if HEADTYPE == obj.Hdarwin { |
| if r.Type == obj.R_CALL { |
| if rs.Type != obj.SHOSTOBJ { |
| o += int64(uint64(Symaddr(rs)) - rs.Sect.Vaddr) |
| } |
| o -= int64(r.Off) // relative to section offset, not symbol |
| } else { |
| o += int64(r.Siz) |
| } |
| } else if HEADTYPE == obj.Hwindows && Thearch.Thechar == '6' { // only amd64 needs PCREL |
| // PE/COFF's PC32 relocation uses the address after the relocated |
| // bytes as the base. Compensate by skewing the addend. |
| o += int64(r.Siz) |
| // GNU ld always add VirtualAddress of the .text section to the |
| // relocated address, compensate that. |
| o -= int64(s.Sect.Vaddr - PEBASE) |
| } else { |
| Diag("unhandled pcrel relocation for %s", headstring) |
| } |
| |
| break |
| } |
| |
| o = 0 |
| if r.Sym != nil { |
| o += Symaddr(r.Sym) |
| } |
| |
| // NOTE: The (int32) cast on the next line works around a bug in Plan 9's 8c |
| // compiler. The expression s->value + r->off + r->siz is int32 + int32 + |
| // uchar, and Plan 9 8c incorrectly treats the expression as type uint32 |
| // instead of int32, causing incorrect values when sign extended for adding |
| // to o. The bug only occurs on Plan 9, because this C program is compiled by |
| // the standard host compiler (gcc on most other systems). |
| o += r.Add - (s.Value + int64(r.Off) + int64(int32(r.Siz))) |
| |
| case obj.R_SIZE: |
| o = r.Sym.Size + r.Add |
| } |
| |
| if r.Variant != RV_NONE { |
| o = Thearch.Archrelocvariant(r, s, o) |
| } |
| |
| if false { |
| nam := "<nil>" |
| if r.Sym != nil { |
| nam = r.Sym.Name |
| } |
| fmt.Printf("relocate %s %#x (%#x+%#x, size %d) => %s %#x +%#x [type %d/%d, %x]\n", s.Name, s.Value+int64(off), s.Value, r.Off, r.Siz, nam, Symaddr(r.Sym), r.Add, r.Type, r.Variant, o) |
| } |
| switch siz { |
| default: |
| Ctxt.Cursym = s |
| Diag("bad reloc size %#x for %s", uint32(siz), r.Sym.Name) |
| fallthrough |
| |
| // TODO(rsc): Remove. |
| case 1: |
| s.P[off] = byte(int8(o)) |
| |
| case 2: |
| if o != int64(int16(o)) { |
| Diag("relocation address is too big: %#x", o) |
| } |
| i16 = int16(o) |
| Ctxt.Arch.ByteOrder.PutUint16(s.P[off:], uint16(i16)) |
| |
| case 4: |
| if r.Type == obj.R_PCREL || r.Type == obj.R_CALL { |
| if o != int64(int32(o)) { |
| Diag("pc-relative relocation address is too big: %#x", o) |
| } |
| } else { |
| if o != int64(int32(o)) && o != int64(uint32(o)) { |
| Diag("non-pc-relative relocation address is too big: %#x", uint64(o)) |
| } |
| } |
| |
| fl = int32(o) |
| Ctxt.Arch.ByteOrder.PutUint32(s.P[off:], uint32(fl)) |
| |
| case 8: |
| Ctxt.Arch.ByteOrder.PutUint64(s.P[off:], uint64(o)) |
| } |
| } |
| } |
| |
| func reloc() { |
| if Debug['v'] != 0 { |
| fmt.Fprintf(&Bso, "%5.2f reloc\n", obj.Cputime()) |
| } |
| Bso.Flush() |
| |
| for s := Ctxt.Textp; s != nil; s = s.Next { |
| relocsym(s) |
| } |
| for s := datap; s != nil; s = s.Next { |
| relocsym(s) |
| } |
| } |
| |
| func dynrelocsym(s *LSym) { |
| if HEADTYPE == obj.Hwindows && Linkmode != LinkExternal { |
| rel := Linklookup(Ctxt, ".rel", 0) |
| if s == rel { |
| return |
| } |
| var r *Reloc |
| var targ *LSym |
| for ri := 0; ri < len(s.R); ri++ { |
| r = &s.R[ri] |
| targ = r.Sym |
| if targ == nil { |
| continue |
| } |
| if !targ.Reachable { |
| Diag("internal inconsistency: dynamic symbol %s is not reachable.", targ.Name) |
| } |
| if r.Sym.Plt == -2 && r.Sym.Got != -2 { // make dynimport JMP table for PE object files. |
| targ.Plt = int32(rel.Size) |
| r.Sym = rel |
| r.Add = int64(targ.Plt) |
| |
| // jmp *addr |
| if Thearch.Thechar == '8' { |
| Adduint8(Ctxt, rel, 0xff) |
| Adduint8(Ctxt, rel, 0x25) |
| Addaddr(Ctxt, rel, targ) |
| Adduint8(Ctxt, rel, 0x90) |
| Adduint8(Ctxt, rel, 0x90) |
| } else { |
| Adduint8(Ctxt, rel, 0xff) |
| Adduint8(Ctxt, rel, 0x24) |
| Adduint8(Ctxt, rel, 0x25) |
| addaddrplus4(Ctxt, rel, targ, 0) |
| Adduint8(Ctxt, rel, 0x90) |
| } |
| } else if r.Sym.Plt >= 0 { |
| r.Sym = rel |
| r.Add = int64(targ.Plt) |
| } |
| } |
| |
| return |
| } |
| |
| var r *Reloc |
| for ri := 0; ri < len(s.R); ri++ { |
| r = &s.R[ri] |
| if r.Sym != nil && r.Sym.Type == obj.SDYNIMPORT || r.Type >= 256 { |
| if r.Sym != nil && !r.Sym.Reachable { |
| Diag("internal inconsistency: dynamic symbol %s is not reachable.", r.Sym.Name) |
| } |
| Thearch.Adddynrel(s, r) |
| } |
| } |
| } |
| |
| func dynreloc() { |
| // -d suppresses dynamic loader format, so we may as well not |
| // compute these sections or mark their symbols as reachable. |
| if Debug['d'] != 0 && HEADTYPE != obj.Hwindows { |
| return |
| } |
| if Debug['v'] != 0 { |
| fmt.Fprintf(&Bso, "%5.2f reloc\n", obj.Cputime()) |
| } |
| Bso.Flush() |
| |
| for s := Ctxt.Textp; s != nil; s = s.Next { |
| dynrelocsym(s) |
| } |
| for s := datap; s != nil; s = s.Next { |
| dynrelocsym(s) |
| } |
| if Iself { |
| elfdynhash() |
| } |
| } |
| |
| func blk(start *LSym, addr int64, size int64) { |
| var sym *LSym |
| |
| for sym = start; sym != nil; sym = sym.Next { |
| if sym.Type&obj.SSUB == 0 && sym.Value >= addr { |
| break |
| } |
| } |
| |
| eaddr := addr + size |
| var ep []byte |
| var p []byte |
| for ; sym != nil; sym = sym.Next { |
| if sym.Type&obj.SSUB != 0 { |
| continue |
| } |
| if sym.Value >= eaddr { |
| break |
| } |
| Ctxt.Cursym = sym |
| if sym.Value < addr { |
| Diag("phase error: addr=%#x but sym=%#x type=%d", int64(addr), int64(sym.Value), sym.Type) |
| errorexit() |
| } |
| |
| for ; addr < sym.Value; addr++ { |
| Cput(0) |
| } |
| p = sym.P |
| ep = p[len(sym.P):] |
| for -cap(p) < -cap(ep) { |
| Cput(uint8(p[0])) |
| p = p[1:] |
| } |
| addr += int64(len(sym.P)) |
| for ; addr < sym.Value+sym.Size; addr++ { |
| Cput(0) |
| } |
| if addr != sym.Value+sym.Size { |
| Diag("phase error: addr=%#x value+size=%#x", int64(addr), int64(sym.Value)+sym.Size) |
| errorexit() |
| } |
| |
| if sym.Value+sym.Size >= eaddr { |
| break |
| } |
| } |
| |
| for ; addr < eaddr; addr++ { |
| Cput(0) |
| } |
| Cflush() |
| } |
| |
| func Codeblk(addr int64, size int64) { |
| if Debug['a'] != 0 { |
| fmt.Fprintf(&Bso, "codeblk [%#x,%#x) at offset %#x\n", addr, addr+size, Cpos()) |
| } |
| |
| blk(Ctxt.Textp, addr, size) |
| |
| /* again for printing */ |
| if Debug['a'] == 0 { |
| return |
| } |
| |
| var sym *LSym |
| for sym = Ctxt.Textp; sym != nil; sym = sym.Next { |
| if !sym.Reachable { |
| continue |
| } |
| if sym.Value >= addr { |
| break |
| } |
| } |
| |
| eaddr := addr + size |
| var q []byte |
| for ; sym != nil; sym = sym.Next { |
| if !sym.Reachable { |
| continue |
| } |
| if sym.Value >= eaddr { |
| break |
| } |
| |
| if addr < sym.Value { |
| fmt.Fprintf(&Bso, "%-20s %.8x|", "_", uint64(int64(addr))) |
| for ; addr < sym.Value; addr++ { |
| fmt.Fprintf(&Bso, " %.2x", 0) |
| } |
| fmt.Fprintf(&Bso, "\n") |
| } |
| |
| fmt.Fprintf(&Bso, "%.6x\t%-20s\n", uint64(int64(addr)), sym.Name) |
| q = sym.P |
| |
| for len(q) >= 16 { |
| fmt.Fprintf(&Bso, "%.6x\t% x\n", uint64(addr), q[:16]) |
| addr += 16 |
| q = q[16:] |
| } |
| |
| if len(q) > 0 { |
| fmt.Fprintf(&Bso, "%.6x\t% x\n", uint64(addr), q) |
| addr += int64(len(q)) |
| } |
| } |
| |
| if addr < eaddr { |
| fmt.Fprintf(&Bso, "%-20s %.8x|", "_", uint64(int64(addr))) |
| for ; addr < eaddr; addr++ { |
| fmt.Fprintf(&Bso, " %.2x", 0) |
| } |
| } |
| |
| Bso.Flush() |
| } |
| |
| func Datblk(addr int64, size int64) { |
| if Debug['a'] != 0 { |
| fmt.Fprintf(&Bso, "datblk [%#x,%#x) at offset %#x\n", addr, addr+size, Cpos()) |
| } |
| |
| blk(datap, addr, size) |
| |
| /* again for printing */ |
| if Debug['a'] == 0 { |
| return |
| } |
| |
| var sym *LSym |
| for sym = datap; sym != nil; sym = sym.Next { |
| if sym.Value >= addr { |
| break |
| } |
| } |
| |
| eaddr := addr + size |
| var ep []byte |
| var i int64 |
| var p []byte |
| var r *Reloc |
| var rsname string |
| var typ string |
| for ; sym != nil; sym = sym.Next { |
| if sym.Value >= eaddr { |
| break |
| } |
| if addr < sym.Value { |
| fmt.Fprintf(&Bso, "\t%.8x| 00 ...\n", uint64(addr)) |
| addr = sym.Value |
| } |
| |
| fmt.Fprintf(&Bso, "%s\n\t%.8x|", sym.Name, uint(addr)) |
| p = sym.P |
| ep = p[len(sym.P):] |
| for -cap(p) < -cap(ep) { |
| if -cap(p) > -cap(sym.P) && int(-cap(p)+cap(sym.P))%16 == 0 { |
| fmt.Fprintf(&Bso, "\n\t%.8x|", uint(addr+int64(-cap(p)+cap(sym.P)))) |
| } |
| fmt.Fprintf(&Bso, " %.2x", p[0]) |
| p = p[1:] |
| } |
| |
| addr += int64(len(sym.P)) |
| for ; addr < sym.Value+sym.Size; addr++ { |
| fmt.Fprintf(&Bso, " %.2x", 0) |
| } |
| fmt.Fprintf(&Bso, "\n") |
| |
| if Linkmode == LinkExternal { |
| for i = 0; i < int64(len(sym.R)); i++ { |
| r = &sym.R[i] |
| rsname = "" |
| if r.Sym != nil { |
| rsname = r.Sym.Name |
| } |
| typ = "?" |
| switch r.Type { |
| case obj.R_ADDR: |
| typ = "addr" |
| |
| case obj.R_PCREL: |
| typ = "pcrel" |
| |
| case obj.R_CALL: |
| typ = "call" |
| } |
| |
| fmt.Fprintf(&Bso, "\treloc %.8x/%d %s %s+%#x [%#x]\n", uint(sym.Value+int64(r.Off)), r.Siz, typ, rsname, int64(r.Add), int64(r.Sym.Value+r.Add)) |
| } |
| } |
| } |
| |
| if addr < eaddr { |
| fmt.Fprintf(&Bso, "\t%.8x| 00 ...\n", uint(addr)) |
| } |
| fmt.Fprintf(&Bso, "\t%.8x|\n", uint(eaddr)) |
| } |
| |
| func strnput(s string, n int) { |
| for ; n > 0 && s != ""; s = s[1:] { |
| Cput(uint8(s[0])) |
| n-- |
| } |
| |
| for n > 0 { |
| Cput(0) |
| n-- |
| } |
| } |
| |
| var strdata []*LSym |
| |
| func addstrdata1(arg string) { |
| i := strings.Index(arg, "=") |
| if i < 0 { |
| Exitf("-X flag requires argument of the form importpath.name=value") |
| } |
| addstrdata(arg[:i], arg[i+1:]) |
| } |
| |
| func addstrdata(name string, value string) { |
| p := fmt.Sprintf("%s.str", name) |
| sp := Linklookup(Ctxt, p, 0) |
| |
| Addstring(sp, value) |
| sp.Type = obj.SRODATA |
| |
| s := Linklookup(Ctxt, name, 0) |
| s.Size = 0 |
| s.Dupok = 1 |
| reachable := s.Reachable |
| Addaddr(Ctxt, s, sp) |
| adduintxx(Ctxt, s, uint64(len(value)), Thearch.Ptrsize) |
| |
| // addstring, addaddr, etc., mark the symbols as reachable. |
| // In this case that is not necessarily true, so stick to what |
| // we know before entering this function. |
| s.Reachable = reachable |
| |
| strdata = append(strdata, s) |
| |
| sp.Reachable = reachable |
| } |
| |
| func checkstrdata() { |
| for _, s := range strdata { |
| if s.Type == obj.STEXT { |
| Diag("cannot use -X with text symbol %s", s.Name) |
| } else if s.Gotype != nil && s.Gotype.Name != "type.string" { |
| Diag("cannot use -X with non-string symbol %s", s.Name) |
| } |
| } |
| } |
| |
| func Addstring(s *LSym, str string) int64 { |
| if s.Type == 0 { |
| s.Type = obj.SNOPTRDATA |
| } |
| s.Reachable = true |
| r := int32(s.Size) |
| n := len(str) + 1 |
| if s.Name == ".shstrtab" { |
| elfsetstring(str, int(r)) |
| } |
| Symgrow(Ctxt, s, int64(r)+int64(n)) |
| copy(s.P[r:], str) |
| s.P[int(r)+len(str)] = 0 |
| s.Size += int64(n) |
| return int64(r) |
| } |
| |
| // addgostring adds str, as a Go string value, to s. symname is the name of the |
| // symbol used to define the string data and must be unique per linked object. |
| func addgostring(s *LSym, symname, str string) { |
| sym := Linklookup(Ctxt, symname, 0) |
| if sym.Type != obj.Sxxx { |
| Diag("duplicate symname in addgostring: %s", symname) |
| } |
| sym.Reachable = true |
| sym.Local = true |
| sym.Type = obj.SRODATA |
| sym.Size = int64(len(str)) |
| sym.P = []byte(str) |
| Addaddr(Ctxt, s, sym) |
| adduint(Ctxt, s, uint64(len(str))) |
| } |
| |
| func addinitarrdata(s *LSym) { |
| p := s.Name + ".ptr" |
| sp := Linklookup(Ctxt, p, 0) |
| sp.Type = obj.SINITARR |
| sp.Size = 0 |
| sp.Dupok = 1 |
| Addaddr(Ctxt, sp, s) |
| } |
| |
| func dosymtype() { |
| for s := Ctxt.Allsym; s != nil; s = s.Allsym { |
| if len(s.P) > 0 { |
| if s.Type == obj.SBSS { |
| s.Type = obj.SDATA |
| } |
| if s.Type == obj.SNOPTRBSS { |
| s.Type = obj.SNOPTRDATA |
| } |
| } |
| // Create a new entry in the .init_array section that points to the |
| // library initializer function. |
| switch Buildmode { |
| case BuildmodeCArchive, BuildmodeCShared: |
| if s.Name == INITENTRY { |
| addinitarrdata(s) |
| } |
| } |
| } |
| } |
| |
| func symalign(s *LSym) int32 { |
| if s.Align != 0 { |
| return s.Align |
| } |
| |
| align := int32(Thearch.Maxalign) |
| for int64(align) > s.Size && align > 1 { |
| align >>= 1 |
| } |
| if align < s.Align { |
| align = s.Align |
| } |
| return align |
| } |
| |
| func aligndatsize(datsize int64, s *LSym) int64 { |
| return Rnd(datsize, int64(symalign(s))) |
| } |
| |
| // maxalign returns the maximum required alignment for |
| // the list of symbols s; the list stops when s->type exceeds type. |
| func maxalign(s *LSym, type_ int) int32 { |
| var align int32 |
| |
| max := int32(0) |
| for ; s != nil && int(s.Type) <= type_; s = s.Next { |
| align = symalign(s) |
| if max < align { |
| max = align |
| } |
| } |
| |
| return max |
| } |
| |
| const debugGCProg = false |
| |
| type GCProg struct { |
| sym *LSym |
| w gcprog.Writer |
| } |
| |
| func (p *GCProg) Init(name string) { |
| p.sym = Linklookup(Ctxt, name, 0) |
| p.w.Init(p.writeByte) |
| if debugGCProg { |
| fmt.Fprintf(os.Stderr, "ld: start GCProg %s\n", name) |
| p.w.Debug(os.Stderr) |
| } |
| } |
| |
| func (p *GCProg) writeByte(x byte) { |
| Adduint8(Ctxt, p.sym, x) |
| } |
| |
| func (p *GCProg) End(size int64) { |
| p.w.ZeroUntil(size / int64(Thearch.Ptrsize)) |
| p.w.End() |
| if debugGCProg { |
| fmt.Fprintf(os.Stderr, "ld: end GCProg\n") |
| } |
| } |
| |
| func (p *GCProg) AddSym(s *LSym) { |
| typ := s.Gotype |
| // Things without pointers should be in SNOPTRDATA or SNOPTRBSS; |
| // everything we see should have pointers and should therefore have a type. |
| if typ == nil { |
| Diag("missing Go type information for global symbol: %s size %d", s.Name, int(s.Size)) |
| return |
| } |
| |
| ptrsize := int64(Thearch.Ptrsize) |
| nptr := decodetype_ptrdata(typ) / ptrsize |
| |
| if debugGCProg { |
| fmt.Fprintf(os.Stderr, "gcprog sym: %s at %d (ptr=%d+%d)\n", s.Name, s.Value, s.Value/ptrsize, nptr) |
| } |
| |
| if decodetype_usegcprog(typ) == 0 { |
| // Copy pointers from mask into program. |
| mask := decodetype_gcmask(typ) |
| for i := int64(0); i < nptr; i++ { |
| if (mask[i/8]>>uint(i%8))&1 != 0 { |
| p.w.Ptr(s.Value/ptrsize + i) |
| } |
| } |
| return |
| } |
| |
| // Copy program. |
| prog := decodetype_gcprog(typ) |
| p.w.ZeroUntil(s.Value / ptrsize) |
| p.w.Append(prog[4:], nptr) |
| } |
| |
| func growdatsize(datsizep *int64, s *LSym) { |
| datsize := *datsizep |
| const cutoff int64 = 2e9 // 2 GB (or so; looks better in errors than 2^31) |
| switch { |
| case s.Size < 0: |
| Diag("%s: negative size (%d bytes)", s.Name, s.Size) |
| case s.Size > cutoff: |
| Diag("%s: symbol too large (%d bytes)", s.Name, s.Size) |
| case datsize <= cutoff && datsize+s.Size > cutoff: |
| Diag("%s: too much data (over %d bytes)", s.Name, cutoff) |
| } |
| *datsizep = datsize + s.Size |
| } |
| |
| func dodata() { |
| if Debug['v'] != 0 { |
| fmt.Fprintf(&Bso, "%5.2f dodata\n", obj.Cputime()) |
| } |
| Bso.Flush() |
| |
| var last *LSym |
| datap = nil |
| |
| for s := Ctxt.Allsym; s != nil; s = s.Allsym { |
| if !s.Reachable || s.Special != 0 { |
| continue |
| } |
| if obj.STEXT < s.Type && s.Type < obj.SXREF { |
| if s.Onlist != 0 { |
| log.Fatalf("symbol %s listed multiple times", s.Name) |
| } |
| s.Onlist = 1 |
| if last == nil { |
| datap = s |
| } else { |
| last.Next = s |
| } |
| s.Next = nil |
| last = s |
| } |
| } |
| |
| for s := datap; s != nil; s = s.Next { |
| if int64(len(s.P)) > s.Size { |
| Diag("%s: initialize bounds (%d < %d)", s.Name, int64(s.Size), len(s.P)) |
| } |
| } |
| |
| /* |
| * now that we have the datap list, but before we start |
| * to assign addresses, record all the necessary |
| * dynamic relocations. these will grow the relocation |
| * symbol, which is itself data. |
| * |
| * on darwin, we need the symbol table numbers for dynreloc. |
| */ |
| if HEADTYPE == obj.Hdarwin { |
| machosymorder() |
| } |
| dynreloc() |
| |
| /* some symbols may no longer belong in datap (Mach-O) */ |
| var l **LSym |
| var s *LSym |
| for l = &datap; ; { |
| s = *l |
| if s == nil { |
| break |
| } |
| |
| if s.Type <= obj.STEXT || obj.SXREF <= s.Type { |
| *l = s.Next |
| } else { |
| l = &s.Next |
| } |
| } |
| |
| *l = nil |
| |
| datap = listsort(datap, datcmp, listnextp) |
| |
| if Iself { |
| // Make .rela and .rela.plt contiguous, the ELF ABI requires this |
| // and Solaris actually cares. |
| var relplt *LSym |
| for l = &datap; *l != nil; l = &(*l).Next { |
| if (*l).Name == ".rel.plt" || (*l).Name == ".rela.plt" { |
| relplt = (*l) |
| *l = (*l).Next |
| break |
| } |
| } |
| if relplt != nil { |
| for s = datap; s != nil; s = s.Next { |
| if s.Name == ".rel" || s.Name == ".rela" { |
| relplt.Next = s.Next |
| s.Next = relplt |
| } |
| } |
| } |
| } |
| |
| /* |
| * allocate sections. list is sorted by type, |
| * so we can just walk it for each piece we want to emit. |
| * segdata is processed before segtext, because we need |
| * to see all symbols in the .data and .bss sections in order |
| * to generate garbage collection information. |
| */ |
| |
| /* begin segdata */ |
| |
| /* skip symbols belonging to segtext */ |
| s = datap |
| |
| for ; s != nil && s.Type < obj.SELFSECT; s = s.Next { |
| } |
| |
| /* writable ELF sections */ |
| datsize := int64(0) |
| |
| var sect *Section |
| for ; s != nil && s.Type < obj.SELFGOT; s = s.Next { |
| sect = addsection(&Segdata, s.Name, 06) |
| sect.Align = symalign(s) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| s.Sect = sect |
| s.Type = obj.SDATA |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| sect.Length = uint64(datsize) - sect.Vaddr |
| } |
| |
| /* .got (and .toc on ppc64) */ |
| if s.Type == obj.SELFGOT { |
| sect := addsection(&Segdata, ".got", 06) |
| sect.Align = maxalign(s, obj.SELFGOT) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| var toc *LSym |
| for ; s != nil && s.Type == obj.SELFGOT; s = s.Next { |
| datsize = aligndatsize(datsize, s) |
| s.Sect = sect |
| s.Type = obj.SDATA |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| |
| // Resolve .TOC. symbol for this object file (ppc64) |
| toc = Linkrlookup(Ctxt, ".TOC.", int(s.Version)) |
| |
| if toc != nil { |
| toc.Sect = sect |
| toc.Outer = s |
| toc.Sub = s.Sub |
| s.Sub = toc |
| |
| toc.Value = 0x8000 |
| } |
| |
| growdatsize(&datsize, s) |
| } |
| |
| sect.Length = uint64(datsize) - sect.Vaddr |
| } |
| |
| /* pointer-free data */ |
| sect = addsection(&Segdata, ".noptrdata", 06) |
| |
| sect.Align = maxalign(s, obj.SINITARR-1) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| Linklookup(Ctxt, "runtime.noptrdata", 0).Sect = sect |
| Linklookup(Ctxt, "runtime.enoptrdata", 0).Sect = sect |
| for ; s != nil && s.Type < obj.SINITARR; s = s.Next { |
| datsize = aligndatsize(datsize, s) |
| s.Sect = sect |
| s.Type = obj.SDATA |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| } |
| |
| sect.Length = uint64(datsize) - sect.Vaddr |
| |
| hasinitarr := Linkshared |
| |
| /* shared library initializer */ |
| switch Buildmode { |
| case BuildmodeCArchive, BuildmodeCShared, BuildmodeShared: |
| hasinitarr = true |
| } |
| |
| if hasinitarr { |
| sect := addsection(&Segdata, ".init_array", 06) |
| sect.Align = maxalign(s, obj.SINITARR) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| for ; s != nil && s.Type == obj.SINITARR; s = s.Next { |
| datsize = aligndatsize(datsize, s) |
| s.Sect = sect |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| } |
| |
| sect.Length = uint64(datsize) - sect.Vaddr |
| } |
| |
| /* data */ |
| sect = addsection(&Segdata, ".data", 06) |
| sect.Align = maxalign(s, obj.SBSS-1) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| Linklookup(Ctxt, "runtime.data", 0).Sect = sect |
| Linklookup(Ctxt, "runtime.edata", 0).Sect = sect |
| var gc GCProg |
| gc.Init("runtime.gcdata") |
| for ; s != nil && s.Type < obj.SBSS; s = s.Next { |
| if s.Type == obj.SINITARR { |
| Ctxt.Cursym = s |
| Diag("unexpected symbol type %d", s.Type) |
| } |
| |
| s.Sect = sect |
| s.Type = obj.SDATA |
| datsize = aligndatsize(datsize, s) |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| gc.AddSym(s) |
| growdatsize(&datsize, s) |
| } |
| sect.Length = uint64(datsize) - sect.Vaddr |
| gc.End(int64(sect.Length)) |
| |
| /* bss */ |
| sect = addsection(&Segdata, ".bss", 06) |
| sect.Align = maxalign(s, obj.SNOPTRBSS-1) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| Linklookup(Ctxt, "runtime.bss", 0).Sect = sect |
| Linklookup(Ctxt, "runtime.ebss", 0).Sect = sect |
| gc = GCProg{} |
| gc.Init("runtime.gcbss") |
| for ; s != nil && s.Type < obj.SNOPTRBSS; s = s.Next { |
| s.Sect = sect |
| datsize = aligndatsize(datsize, s) |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| gc.AddSym(s) |
| growdatsize(&datsize, s) |
| } |
| sect.Length = uint64(datsize) - sect.Vaddr |
| gc.End(int64(sect.Length)) |
| |
| /* pointer-free bss */ |
| sect = addsection(&Segdata, ".noptrbss", 06) |
| |
| sect.Align = maxalign(s, obj.SNOPTRBSS) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| Linklookup(Ctxt, "runtime.noptrbss", 0).Sect = sect |
| Linklookup(Ctxt, "runtime.enoptrbss", 0).Sect = sect |
| for ; s != nil && s.Type == obj.SNOPTRBSS; s = s.Next { |
| datsize = aligndatsize(datsize, s) |
| s.Sect = sect |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| } |
| |
| sect.Length = uint64(datsize) - sect.Vaddr |
| Linklookup(Ctxt, "runtime.end", 0).Sect = sect |
| |
| // 6g uses 4-byte relocation offsets, so the entire segment must fit in 32 bits. |
| if datsize != int64(uint32(datsize)) { |
| Diag("data or bss segment too large") |
| } |
| |
| if Iself && Linkmode == LinkExternal && s != nil && s.Type == obj.STLSBSS && HEADTYPE != obj.Hopenbsd { |
| sect := addsection(&Segdata, ".tbss", 06) |
| sect.Align = int32(Thearch.Ptrsize) |
| sect.Vaddr = 0 |
| datsize = 0 |
| for ; s != nil && s.Type == obj.STLSBSS; s = s.Next { |
| datsize = aligndatsize(datsize, s) |
| s.Sect = sect |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| } |
| |
| sect.Length = uint64(datsize) |
| } else { |
| // Might be internal linking but still using cgo. |
| // In that case, the only possible STLSBSS symbol is runtime.tlsg. |
| // Give it offset 0, because it's the only thing here. |
| if s != nil && s.Type == obj.STLSBSS && s.Name == "runtime.tlsg" { |
| s.Value = 0 |
| s = s.Next |
| } |
| } |
| |
| if s != nil { |
| Ctxt.Cursym = nil |
| Diag("unexpected symbol type %d for %s", s.Type, s.Name) |
| } |
| |
| /* |
| * We finished data, begin read-only data. |
| * Not all systems support a separate read-only non-executable data section. |
| * ELF systems do. |
| * OS X and Plan 9 do not. |
| * Windows PE may, but if so we have not implemented it. |
| * And if we're using external linking mode, the point is moot, |
| * since it's not our decision; that code expects the sections in |
| * segtext. |
| */ |
| var segro *Segment |
| if Iself && Linkmode == LinkInternal { |
| segro = &Segrodata |
| } else { |
| segro = &Segtext |
| } |
| |
| s = datap |
| |
| datsize = 0 |
| |
| /* read-only executable ELF, Mach-O sections */ |
| for ; s != nil && s.Type < obj.STYPE; s = s.Next { |
| sect = addsection(&Segtext, s.Name, 04) |
| sect.Align = symalign(s) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| s.Sect = sect |
| s.Type = obj.SRODATA |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| sect.Length = uint64(datsize) - sect.Vaddr |
| } |
| |
| /* read-only data */ |
| sect = addsection(segro, ".rodata", 04) |
| |
| sect.Align = maxalign(s, obj.STYPELINK-1) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = 0 |
| Linklookup(Ctxt, "runtime.rodata", 0).Sect = sect |
| Linklookup(Ctxt, "runtime.erodata", 0).Sect = sect |
| for ; s != nil && s.Type < obj.STYPELINK; s = s.Next { |
| datsize = aligndatsize(datsize, s) |
| s.Sect = sect |
| s.Type = obj.SRODATA |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| } |
| |
| sect.Length = uint64(datsize) - sect.Vaddr |
| |
| /* typelink */ |
| sect = addsection(segro, ".typelink", 04) |
| |
| sect.Align = maxalign(s, obj.STYPELINK) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| Linklookup(Ctxt, "runtime.typelink", 0).Sect = sect |
| Linklookup(Ctxt, "runtime.etypelink", 0).Sect = sect |
| for ; s != nil && s.Type == obj.STYPELINK; s = s.Next { |
| datsize = aligndatsize(datsize, s) |
| s.Sect = sect |
| s.Type = obj.SRODATA |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| } |
| |
| sect.Length = uint64(datsize) - sect.Vaddr |
| |
| /* gosymtab */ |
| sect = addsection(segro, ".gosymtab", 04) |
| |
| sect.Align = maxalign(s, obj.SPCLNTAB-1) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| Linklookup(Ctxt, "runtime.symtab", 0).Sect = sect |
| Linklookup(Ctxt, "runtime.esymtab", 0).Sect = sect |
| for ; s != nil && s.Type < obj.SPCLNTAB; s = s.Next { |
| datsize = aligndatsize(datsize, s) |
| s.Sect = sect |
| s.Type = obj.SRODATA |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| } |
| |
| sect.Length = uint64(datsize) - sect.Vaddr |
| |
| /* gopclntab */ |
| sect = addsection(segro, ".gopclntab", 04) |
| |
| sect.Align = maxalign(s, obj.SELFROSECT-1) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| Linklookup(Ctxt, "runtime.pclntab", 0).Sect = sect |
| Linklookup(Ctxt, "runtime.epclntab", 0).Sect = sect |
| for ; s != nil && s.Type < obj.SELFROSECT; s = s.Next { |
| datsize = aligndatsize(datsize, s) |
| s.Sect = sect |
| s.Type = obj.SRODATA |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| } |
| |
| sect.Length = uint64(datsize) - sect.Vaddr |
| |
| /* read-only ELF, Mach-O sections */ |
| for ; s != nil && s.Type < obj.SELFSECT; s = s.Next { |
| sect = addsection(segro, s.Name, 04) |
| sect.Align = symalign(s) |
| datsize = Rnd(datsize, int64(sect.Align)) |
| sect.Vaddr = uint64(datsize) |
| s.Sect = sect |
| s.Type = obj.SRODATA |
| s.Value = int64(uint64(datsize) - sect.Vaddr) |
| growdatsize(&datsize, s) |
| sect.Length = uint64(datsize) - sect.Vaddr |
| } |
| |
| // 6g uses 4-byte relocation offsets, so the entire segment must fit in 32 bits. |
| if datsize != int64(uint32(datsize)) { |
| Diag("read-only data segment too large") |
| } |
| |
| /* number the sections */ |
| n := int32(1) |
| |
| for sect := Segtext.Sect; sect != nil; sect = sect.Next { |
| sect.Extnum = int16(n) |
| n++ |
| } |
| for sect := Segrodata.Sect; sect != nil; sect = sect.Next { |
| sect.Extnum = int16(n) |
| n++ |
| } |
| for sect := Segdata.Sect; sect != nil; sect = sect.Next { |
| sect.Extnum = int16(n) |
| n++ |
| } |
| } |
| |
| // Add buildid to beginning of text segment, on non-ELF systems. |
| // Non-ELF binary formats are not always flexible enough to |
| // give us a place to put the Go build ID. On those systems, we put it |
| // at the very beginning of the text segment. |
| // This ``header'' is read by cmd/go. |
| func textbuildid() { |
| if Iself || buildid == "" { |
| return |
| } |
| |
| sym := Linklookup(Ctxt, "go.buildid", 0) |
| sym.Reachable = true |
| // The \xff is invalid UTF-8, meant to make it less likely |
| // to find one of these accidentally. |
| data := "\xff Go build ID: " + strconv.Quote(buildid) + "\n \xff" |
| sym.Type = obj.STEXT |
| sym.P = []byte(data) |
| sym.Size = int64(len(sym.P)) |
| |
| sym.Next = Ctxt.Textp |
| Ctxt.Textp = sym |
| } |
| |
| // assign addresses to text |
| func textaddress() { |
| var sub *LSym |
| |
| addsection(&Segtext, ".text", 05) |
| |
| // Assign PCs in text segment. |
| // Could parallelize, by assigning to text |
| // and then letting threads copy down, but probably not worth it. |
| sect := Segtext.Sect |
| |
| sect.Align = int32(Funcalign) |
| Linklookup(Ctxt, "runtime.text", 0).Sect = sect |
| Linklookup(Ctxt, "runtime.etext", 0).Sect = sect |
| va := uint64(INITTEXT) |
| sect.Vaddr = va |
| for sym := Ctxt.Textp; sym != nil; sym = sym.Next { |
| sym.Sect = sect |
| if sym.Type&obj.SSUB != 0 { |
| continue |
| } |
| if sym.Align != 0 { |
| va = uint64(Rnd(int64(va), int64(sym.Align))) |
| } else { |
| va = uint64(Rnd(int64(va), int64(Funcalign))) |
| } |
| sym.Value = 0 |
| for sub = sym; sub != nil; sub = sub.Sub { |
| sub.Value += int64(va) |
| } |
| if sym.Size == 0 && sym.Sub != nil { |
| Ctxt.Cursym = sym |
| } |
| if sym.Size < MINFUNC { |
| va += MINFUNC // spacing required for findfunctab |
| } else { |
| va += uint64(sym.Size) |
| } |
| } |
| |
| sect.Length = va - sect.Vaddr |
| } |
| |
| // assign addresses |
| func address() { |
| va := uint64(INITTEXT) |
| Segtext.Rwx = 05 |
| Segtext.Vaddr = va |
| Segtext.Fileoff = uint64(HEADR) |
| for s := Segtext.Sect; s != nil; s = s.Next { |
| va = uint64(Rnd(int64(va), int64(s.Align))) |
| s.Vaddr = va |
| va += s.Length |
| } |
| |
| Segtext.Length = va - uint64(INITTEXT) |
| Segtext.Filelen = Segtext.Length |
| if HEADTYPE == obj.Hnacl { |
| va += 32 // room for the "halt sled" |
| } |
| |
| if Segrodata.Sect != nil { |
| // align to page boundary so as not to mix |
| // rodata and executable text. |
| va = uint64(Rnd(int64(va), int64(INITRND))) |
| |
| Segrodata.Rwx = 04 |
| Segrodata.Vaddr = va |
| Segrodata.Fileoff = va - Segtext.Vaddr + Segtext.Fileoff |
| Segrodata.Filelen = 0 |
| for s := Segrodata.Sect; s != nil; s = s.Next { |
| va = uint64(Rnd(int64(va), int64(s.Align))) |
| s.Vaddr = va |
| va += s.Length |
| } |
| |
| Segrodata.Length = va - Segrodata.Vaddr |
| Segrodata.Filelen = Segrodata.Length |
| } |
| |
| va = uint64(Rnd(int64(va), int64(INITRND))) |
| Segdata.Rwx = 06 |
| Segdata.Vaddr = va |
| Segdata.Fileoff = va - Segtext.Vaddr + Segtext.Fileoff |
| Segdata.Filelen = 0 |
| if HEADTYPE == obj.Hwindows { |
| Segdata.Fileoff = Segtext.Fileoff + uint64(Rnd(int64(Segtext.Length), PEFILEALIGN)) |
| } |
| if HEADTYPE == obj.Hplan9 { |
| Segdata.Fileoff = Segtext.Fileoff + Segtext.Filelen |
| } |
| var data *Section |
| var noptr *Section |
| var bss *Section |
| var noptrbss *Section |
| var vlen int64 |
| for s := Segdata.Sect; s != nil; s = s.Next { |
| vlen = int64(s.Length) |
| if s.Next != nil { |
| vlen = int64(s.Next.Vaddr - s.Vaddr) |
| } |
| s.Vaddr = va |
| va += uint64(vlen) |
| Segdata.Length = va - Segdata.Vaddr |
| if s.Name == ".data" { |
| data = s |
| } |
| if s.Name == ".noptrdata" { |
| noptr = s |
| } |
| if s.Name == ".bss" { |
| bss = s |
| } |
| if s.Name == ".noptrbss" { |
| noptrbss = s |
| } |
| } |
| |
| Segdata.Filelen = bss.Vaddr - Segdata.Vaddr |
| |
| text := Segtext.Sect |
| var rodata *Section |
| if Segrodata.Sect != nil { |
| rodata = Segrodata.Sect |
| } else { |
| rodata = text.Next |
| } |
| typelink := rodata.Next |
| symtab := typelink.Next |
| pclntab := symtab.Next |
| |
| var sub *LSym |
| for sym := datap; sym != nil; sym = sym.Next { |
| Ctxt.Cursym = sym |
| if sym.Sect != nil { |
| sym.Value += int64(sym.Sect.Vaddr) |
| } |
| for sub = sym.Sub; sub != nil; sub = sub.Sub { |
| sub.Value += sym.Value |
| } |
| } |
| |
| if Buildmode == BuildmodeShared { |
| s := Linklookup(Ctxt, "go.link.abihashbytes", 0) |
| sectSym := Linklookup(Ctxt, ".note.go.abihash", 0) |
| s.Sect = sectSym.Sect |
| s.Value = int64(sectSym.Sect.Vaddr + 16) |
| } |
| |
| xdefine("runtime.text", obj.STEXT, int64(text.Vaddr)) |
| xdefine("runtime.etext", obj.STEXT, int64(text.Vaddr+text.Length)) |
| xdefine("runtime.rodata", obj.SRODATA, int64(rodata.Vaddr)) |
| xdefine("runtime.erodata", obj.SRODATA, int64(rodata.Vaddr+rodata.Length)) |
| xdefine("runtime.typelink", obj.SRODATA, int64(typelink.Vaddr)) |
| xdefine("runtime.etypelink", obj.SRODATA, int64(typelink.Vaddr+typelink.Length)) |
| |
| sym := Linklookup(Ctxt, "runtime.gcdata", 0) |
| sym.Local = true |
| xdefine("runtime.egcdata", obj.SRODATA, Symaddr(sym)+sym.Size) |
| Linklookup(Ctxt, "runtime.egcdata", 0).Sect = sym.Sect |
| |
| sym = Linklookup(Ctxt, "runtime.gcbss", 0) |
| sym.Local = true |
| xdefine("runtime.egcbss", obj.SRODATA, Symaddr(sym)+sym.Size) |
| Linklookup(Ctxt, "runtime.egcbss", 0).Sect = sym.Sect |
| |
| xdefine("runtime.symtab", obj.SRODATA, int64(symtab.Vaddr)) |
| xdefine("runtime.esymtab", obj.SRODATA, int64(symtab.Vaddr+symtab.Length)) |
| xdefine("runtime.pclntab", obj.SRODATA, int64(pclntab.Vaddr)) |
| xdefine("runtime.epclntab", obj.SRODATA, int64(pclntab.Vaddr+pclntab.Length)) |
| xdefine("runtime.noptrdata", obj.SNOPTRDATA, int64(noptr.Vaddr)) |
| xdefine("runtime.enoptrdata", obj.SNOPTRDATA, int64(noptr.Vaddr+noptr.Length)) |
| xdefine("runtime.bss", obj.SBSS, int64(bss.Vaddr)) |
| xdefine("runtime.ebss", obj.SBSS, int64(bss.Vaddr+bss.Length)) |
| xdefine("runtime.data", obj.SDATA, int64(data.Vaddr)) |
| xdefine("runtime.edata", obj.SDATA, int64(data.Vaddr+data.Length)) |
| xdefine("runtime.noptrbss", obj.SNOPTRBSS, int64(noptrbss.Vaddr)) |
| xdefine("runtime.enoptrbss", obj.SNOPTRBSS, int64(noptrbss.Vaddr+noptrbss.Length)) |
| xdefine("runtime.end", obj.SBSS, int64(Segdata.Vaddr+Segdata.Length)) |
| } |
