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cmd/link, runtime: implement & call addmoduledata on ppc64le

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Change-Id: I3980d82c7df95e69522c3d2c90311f89c6fef0e1
Reviewed-on: https://go-review.googlesource.com/15972
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Michael Hudson-Doyle 2015-10-16 21:22:20 +13:00
parent 64fbca41c8
commit 1ccefcd1b8
2 changed files with 89 additions and 1 deletions
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80
src/cmd/link/internal/ppc64/asm.go
View File

@ -38,7 +38,7 @@ import (
"log"
)
func gentext() {
func genplt() {
var s *ld.LSym
var stub *ld.LSym
var pprevtextp **ld.LSym
@ -137,6 +137,84 @@ func gentext() {
ld.Ctxt.Arch.ByteOrder.PutUint32(s.P[r.Off+4:], o1)
}
}
}
func genaddmoduledata() {
addmoduledata := ld.Linkrlookup(ld.Ctxt, "runtime.addmoduledata", 0)
if addmoduledata.Type == obj.STEXT {
return
}
addmoduledata.Reachable = true
initfunc := ld.Linklookup(ld.Ctxt, "go.link.addmoduledata", 0)
initfunc.Type = obj.STEXT
initfunc.Local = true
initfunc.Reachable = true
o := func(op uint32) {
ld.Adduint32(ld.Ctxt, initfunc, op)
}
// addis r2, r12, .TOC.-func@ha
rel := ld.Addrel(initfunc)
rel.Off = int32(initfunc.Size)
rel.Siz = 8
rel.Sym = ld.Linklookup(ld.Ctxt, ".TOC.", 0)
rel.Type = obj.R_ADDRPOWER_PCREL
o(0x3c4c0000)
// addi r2, r2, .TOC.-func@l
o(0x38420000)
// mflr r31
o(0x7c0802a6)
// stdu r31, -32(r1)
o(0xf801ffe1)
// addis r3, r2, local.moduledata@got@ha
rel = ld.Addrel(initfunc)
rel.Off = int32(initfunc.Size)
rel.Siz = 8
rel.Sym = ld.Linklookup(ld.Ctxt, "local.moduledata", 0)
rel.Type = obj.R_ADDRPOWER_GOT
o(0x3c620000)
// ld r3, local.moduledata@got@l(r3)
o(0xe8630000)
// bl runtime.addmoduledata
rel = ld.Addrel(initfunc)
rel.Off = int32(initfunc.Size)
rel.Siz = 4
rel.Sym = addmoduledata
rel.Type = obj.R_CALLPOWER
o(0x48000001)
// nop
o(0x60000000)
// ld r31, 0(r1)
o(0xe8010000)
// mtlr r31
o(0x7c0803a6)
// addi r1,r1,32
o(0x38210020)
// blr
o(0x4e800020)
if ld.Ctxt.Etextp != nil {
ld.Ctxt.Etextp.Next = initfunc
} else {
ld.Ctxt.Textp = initfunc
}
ld.Ctxt.Etextp = initfunc
initarray_entry := ld.Linklookup(ld.Ctxt, "go.link.addmoduledatainit", 0)
initarray_entry.Reachable = true
initarray_entry.Local = true
initarray_entry.Type = obj.SINITARR
ld.Addaddr(ld.Ctxt, initarray_entry, initfunc)
}
func gentext() {
if ld.DynlinkingGo() {
genaddmoduledata()
}
if ld.Linkmode == ld.LinkInternal {
genplt()
}
}
// Construct a call stub in stub that calls symbol targ via its PLT

10
src/runtime/asm_ppc64x.s
View File

@ -1070,3 +1070,13 @@ TEXT runtime·prepGoExitFrame(SB),NOSPLIT,$0-8
MOVD sp+0(FP), R3
MOVD R2, 24(R3)
RET
TEXT runtime·addmoduledata(SB),NOSPLIT|NOFRAME,$0-0
ADD $-8, R1
MOVD R31, 0(R1)
MOVD runtime·lastmoduledatap(SB), R4
MOVD R3, moduledata_next(R4)
MOVD R3, runtime·lastmoduledatap(SB)
MOVD 0(R1), R31
ADD $8, R1
RET