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cmd/link, runtime: allow external linking for aix/ppc64

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This commit adds external linking in cmd/link for aix/ppc64.
As relocations on .text data aren't possible on AIX, Segrelrodata is
used to move all these datas to .data section.

Change-Id: I4d1361c1fc9290e11e6f5560864460c76551dbeb
Reviewed-on: https://go-review.googlesource.com/c/go/+/164003
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Clément Chigot 2019-02-20 16:16:38 +01:00 • committed by Ian Lance Taylor
parent 0ff0df8be3
commit 80f10965ee
9 changed files with 297 additions and 24 deletions
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17
src/cmd/link/internal/ld/data.go
View file

@ -308,6 +308,8 @@ func relocsym(ctxt *Link, s *sym.Symbol) {
}
} else if ctxt.HeadType == objabi.Hwindows {
// nothing to do
} else if ctxt.HeadType == objabi.Haix {
o = Symaddr(r.Sym) + r.Add
} else {
Errorf(s, "unhandled pcrel relocation to %s on %v", rs.Name, ctxt.HeadType)
}
@ -1400,7 +1402,7 @@ func (ctxt *Link) dodata() {
if len(data[sym.STLSBSS]) > 0 {
var sect *sym.Section
if ctxt.IsELF && (ctxt.LinkMode == LinkExternal || !*FlagD) {
if (ctxt.IsELF || ctxt.HeadType == objabi.Haix) && (ctxt.LinkMode == LinkExternal || !*FlagD) {
sect = addsection(ctxt.Arch, &Segdata, ".tbss", 06)
sect.Align = int32(ctxt.Arch.PtrSize)
sect.Vaddr = 0
@ -1538,7 +1540,7 @@ func (ctxt *Link) dodata() {
if ctxt.UseRelro() {
addrelrosection = func(suffix string) *sym.Section {
seg := &Segrelrodata
if ctxt.LinkMode == LinkExternal {
if ctxt.LinkMode == LinkExternal && ctxt.HeadType != objabi.Haix {
// Using a separate segment with an external
// linker results in some programs moving
// their data sections unexpectedly, which
@ -2046,6 +2048,10 @@ func (ctxt *Link) address() []*sym.Segment {
// align to page boundary so as not to mix
// rodata, rel-ro data, and executable text.
va = uint64(Rnd(int64(va), int64(*FlagRound)))
if ctxt.HeadType == objabi.Haix {
// Relro data are inside data segment on AIX.
va += uint64(XCOFFDATABASE) - uint64(XCOFFTEXTBASE)
}
order = append(order, &Segrelrodata)
Segrelrodata.Rwx = 06
@ -2060,9 +2066,10 @@ func (ctxt *Link) address() []*sym.Segment {
}
va = uint64(Rnd(int64(va), int64(*FlagRound)))
if ctxt.HeadType == objabi.Haix {
if ctxt.HeadType == objabi.Haix && len(Segrelrodata.Sections) == 0 {
// Data sections are moved to an unreachable segment
// to ensure that they are position-independent.
// Already done if relro sections exist.
va += uint64(XCOFFDATABASE) - uint64(XCOFFTEXTBASE)
}
order = append(order, &Segdata)
@ -2073,11 +2080,11 @@ func (ctxt *Link) address() []*sym.Segment {
var bss *sym.Section
var noptrbss *sym.Section
for i, s := range Segdata.Sections {
if ctxt.IsELF && s.Name == ".tbss" {
if (ctxt.IsELF || ctxt.HeadType == objabi.Haix) && s.Name == ".tbss" {
continue
}
vlen := int64(s.Length)
if i+1 < len(Segdata.Sections) && !(ctxt.IsELF && Segdata.Sections[i+1].Name == ".tbss") {
if i+1 < len(Segdata.Sections) && !((ctxt.IsELF || ctxt.HeadType == objabi.Haix) && Segdata.Sections[i+1].Name == ".tbss") {
vlen = int64(Segdata.Sections[i+1].Vaddr - s.Vaddr)
}
s.Vaddr = va