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cmd/link: enable -buildmode=plugin for ppc64le

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This enables support for the buildmode plugin on
ppc64le.

Fixes #20756

Change-Id: I83241ff63f9b5c366fe0496cf46a3f67d75d08ac
Reviewed-on: https://go-review.googlesource.com/55850
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Lynn Boger 2017-08-15 14:34:53 -04:00
parent dc3b8a193c
commit e9cbabb334
5 changed files with 21 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/cmd/dist/test.go vendored
View File

@ -840,7 +840,7 @@ func (t *tester) supportedBuildmode(mode string) bool {
// linux-arm64 is missing because it causes the external linker
// to crash, see https://golang.org/issue/17138
switch pair {
case "linux-386", "linux-amd64", "linux-arm", "linux-s390x":
case "linux-386", "linux-amd64", "linux-arm", "linux-s390x", "linux-ppc64le":
return true
case "darwin-amd64":
return true

2
src/cmd/go/internal/work/build.go
View File

@ -356,7 +356,7 @@ func BuildModeInit() {
codegenArg = "-fPIC"
} else {
switch platform {
case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/s390x",
case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/s390x", "linux/ppc64le",
"android/amd64", "android/arm", "android/arm64", "android/386":
case "darwin/amd64":
// Skip DWARF generation due to #21647

2
src/cmd/link/internal/ld/config.go
View File

@ -90,7 +90,7 @@ func (mode *BuildMode) Set(s string) error {
switch objabi.GOOS {
case "linux":
switch objabi.GOARCH {
case "386", "amd64", "arm", "arm64", "s390x":
case "386", "amd64", "arm", "arm64", "s390x", "ppc64le":
default:
return badmode()
}

8
src/cmd/link/internal/ld/lib.go
View File

@ -168,8 +168,12 @@ func (ctxt *Link) DynlinkingGo() bool {
if !ctxt.Loaded {
panic("DynlinkingGo called before all symbols loaded")
}
canUsePlugins := ctxt.Syms.ROLookup("plugin.Open", 0) != nil
return Buildmode == BuildmodeShared || *FlagLinkshared || Buildmode == BuildmodePlugin || canUsePlugins
return Buildmode == BuildmodeShared || *FlagLinkshared || Buildmode == BuildmodePlugin || ctxt.CanUsePlugins()
}
// CanUsePlugins returns whether a plugins can be used
func (ctxt *Link) CanUsePlugins() bool {
return ctxt.Syms.ROLookup("plugin.Open", 0) != nil
}
// UseRelro returns whether to make use of "read only relocations" aka

12
src/cmd/link/internal/ppc64/asm.go
View File

@ -131,7 +131,7 @@ func genplt(ctxt *ld.Link) {
func genaddmoduledata(ctxt *ld.Link) {
addmoduledata := ctxt.Syms.ROLookup("runtime.addmoduledata", 0)
if addmoduledata.Type == ld.STEXT {
if addmoduledata.Type == ld.STEXT && ld.Buildmode != ld.BuildmodePlugin {
return
}
addmoduledata.Attr |= ld.AttrReachable
@ -147,6 +147,7 @@ func genaddmoduledata(ctxt *ld.Link) {
rel.Off = int32(initfunc.Size)
rel.Siz = 8
rel.Sym = ctxt.Syms.Lookup(".TOC.", 0)
rel.Sym.Attr |= ld.AttrReachable
rel.Type = objabi.R_ADDRPOWER_PCREL
o(0x3c4c0000)
// addi r2, r2, .TOC.-func@l
@ -159,7 +160,13 @@ func genaddmoduledata(ctxt *ld.Link) {
rel = ld.Addrel(initfunc)
rel.Off = int32(initfunc.Size)
rel.Siz = 8
if !ctxt.CanUsePlugins() {
rel.Sym = ctxt.Syms.Lookup("local.moduledata", 0)
} else {
rel.Sym = ctxt.Syms.Lookup("runtime.firstmoduledata", 0)
}
rel.Sym.Attr |= ld.AttrReachable
rel.Sym.Attr |= ld.AttrLocal
rel.Type = objabi.R_ADDRPOWER_GOT
o(0x3c620000)
// ld r3, local.moduledata@got@l(r3)
@ -182,6 +189,9 @@ func genaddmoduledata(ctxt *ld.Link) {
// blr
o(0x4e800020)
if ld.Buildmode == ld.BuildmodePlugin {
ctxt.Textp = append(ctxt.Textp, addmoduledata)
}
initarray_entry := ctxt.Syms.Lookup("go.link.addmoduledatainit", 0)
ctxt.Textp = append(ctxt.Textp, initfunc)
initarray_entry.Attr |= ld.AttrReachable