/
data.go
1830 lines (1598 loc) · 45.2 KB
/
data.go
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// 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 (
"cmd/internal/gcprog"
"cmd/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() {
if !(Thearch.Thechar == '9' && Linkmode == LinkExternal && r.Sym.Name == ".TOC.") {
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)
}
switch r.Type {
default:
switch siz {
default:
Diag("bad reloc size %#x for %s", uint32(siz), r.Sym.Name)
case 1:
o = int64(s.P[off])
case 2:
o = int64(Ctxt.Arch.ByteOrder.Uint16(s.P[off:]))
case 4:
o = int64(Ctxt.Arch.ByteOrder.Uint32(s.P[off:]))
case 8:
o = int64(Ctxt.Arch.ByteOrder.Uint64(s.P[off:]))
}
if Thearch.Archreloc(r, s, &o) < 0 {
Diag("unknown reloc %d", r.Type)
}
case obj.R_TLS_LE:
isAndroidX86 := goos == "android" && (Thearch.Thechar == '6' || Thearch.Thechar == '8')
if Linkmode == LinkExternal && Iself && HEADTYPE != obj.Hopenbsd && !isAndroidX86 {
r.Done = 0
if r.Sym == nil {
r.Sym = Ctxt.Tlsg
}
r.Xsym = r.Sym
r.Xadd = r.Add
o = 0
if Thearch.Thechar != '6' {
o = r.Add
}
break
}
if 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
} else if Iself || Ctxt.Headtype == obj.Hplan9 || Ctxt.Headtype == obj.Hdarwin || isAndroidX86 {
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:
isAndroidX86 := goos == "android" && (Thearch.Thechar == '6' || Thearch.Thechar == '8')
if Linkmode == LinkExternal && Iself && HEADTYPE != obj.Hopenbsd && !isAndroidX86 {
r.Done = 0
if r.Sym == nil {
r.Sym = Ctxt.Tlsg
}
r.Xsym = r.Sym
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() {