mirror of https://github.com/golang/go.git
all: implement plugin build mode for riscv64
Change-Id: I8d7bbeebbf4a46f2fd8d630b1edbaf79b8ffccc5 Reviewed-on: https://go-review.googlesource.com/c/go/+/420114 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Joel Sing <joel@sing.id.au> TryBot-Bypass: Joel Sing <joel@sing.id.au>
This commit is contained in:
Meng Zhuo
Meng Zhuo
parent
58083b57d4
commit
cdc9560794
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@ -1767,7 +1767,7 @@ func buildModeSupported(compiler, buildmode, goos, goarch string) bool {
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case "plugin":
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switch platform {
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case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/loong64", "linux/s390x", "linux/ppc64le",
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case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/loong64", "linux/riscv64", "linux/s390x", "linux/ppc64le",
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"android/amd64", "android/386",
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"darwin/amd64", "darwin/arm64",
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"freebsd/amd64":
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@ -157,6 +157,127 @@ func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
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p.From.Offset = 0
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}
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}
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if ctxt.Flag_dynlink {
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rewriteToUseGot(ctxt, p, newprog)
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}
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}
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// Rewrite p, if necessary, to access global data via the global offset table.
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func rewriteToUseGot(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
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if p.As == obj.ADUFFCOPY || p.As == obj.ADUFFZERO {
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// ADUFFxxx $offset
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// becomes
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// MOV runtime.duffxxx@GOT, REG_TMP
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// ADD $offset, REG_TMP
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// CALL REG_TMP
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var sym *obj.LSym
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if p.As == obj.ADUFFCOPY {
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sym = ctxt.LookupABI("runtime.duffcopy", obj.ABIInternal)
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} else {
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sym = ctxt.LookupABI("runtime.duffzero", obj.ABIInternal)
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}
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offset := p.To.Offset
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p.As = AMOV
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p.From.Type = obj.TYPE_MEM
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p.From.Name = obj.NAME_GOTREF
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p.From.Sym = sym
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REG_TMP
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p.To.Name = obj.NAME_NONE
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p.To.Offset = 0
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p.To.Sym = nil
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p1 := obj.Appendp(p, newprog)
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p1.As = AADD
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p1.From.Type = obj.TYPE_CONST
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p1.From.Offset = offset
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p1.To.Type = obj.TYPE_REG
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p1.To.Reg = REG_TMP
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p2 := obj.Appendp(p1, newprog)
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p2.As = obj.ACALL
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p2.To.Type = obj.TYPE_REG
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p2.To.Reg = REG_TMP
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}
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// We only care about global data: NAME_EXTERN means a global
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// symbol in the Go sense and p.Sym.Local is true for a few internally
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// defined symbols.
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if p.From.Type == obj.TYPE_ADDR && p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local() {
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// MOV $sym, Rx becomes MOV sym@GOT, Rx
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// MOV $sym+<off>, Rx becomes MOV sym@GOT, Rx; ADD <off>, Rx
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if p.As != AMOV {
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ctxt.Diag("don't know how to handle TYPE_ADDR in %v with -dynlink", p)
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}
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if p.To.Type != obj.TYPE_REG {
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ctxt.Diag("don't know how to handle LD instruction to non-register in %v with -dynlink", p)
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}
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p.From.Type = obj.TYPE_MEM
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p.From.Name = obj.NAME_GOTREF
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if p.From.Offset != 0 {
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q := obj.Appendp(p, newprog)
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q.As = AADD
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q.From.Type = obj.TYPE_CONST
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q.From.Offset = p.From.Offset
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q.To = p.To
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p.From.Offset = 0
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}
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}
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if p.GetFrom3() != nil && p.GetFrom3().Name == obj.NAME_EXTERN {
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ctxt.Diag("don't know how to handle %v with -dynlink", p)
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}
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var source *obj.Addr
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// MOVx sym, Ry becomes MOV sym@GOT, X31; MOVx (X31), Ry
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// MOVx Ry, sym becomes MOV sym@GOT, X31; MOV Ry, (X31)
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// An addition may be inserted between the two MOVs if there is an offset.
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if p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local() {
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if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local() {
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ctxt.Diag("cannot handle NAME_EXTERN on both sides in %v with -dynlink", p)
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}
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source = &p.From
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} else if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local() {
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source = &p.To
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} else {
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return
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}
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if p.As == obj.ATEXT || p.As == obj.AFUNCDATA || p.As == obj.ACALL || p.As == obj.ARET || p.As == obj.AJMP {
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return
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}
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if source.Sym.Type == objabi.STLSBSS {
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return
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}
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if source.Type != obj.TYPE_MEM {
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ctxt.Diag("don't know how to handle %v with -dynlink", p)
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}
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p1 := obj.Appendp(p, newprog)
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p1.As = AMOV
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p1.From.Type = obj.TYPE_MEM
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p1.From.Sym = source.Sym
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p1.From.Name = obj.NAME_GOTREF
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p1.To.Type = obj.TYPE_REG
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p1.To.Reg = REG_TMP
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p2 := obj.Appendp(p1, newprog)
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p2.As = p.As
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p2.From = p.From
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p2.To = p.To
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if p.From.Name == obj.NAME_EXTERN {
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p2.From.Reg = REG_TMP
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p2.From.Name = obj.NAME_NONE
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p2.From.Sym = nil
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} else if p.To.Name == obj.NAME_EXTERN {
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p2.To.Reg = REG_TMP
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p2.To.Name = obj.NAME_NONE
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p2.To.Sym = nil
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} else {
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return
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}
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obj.Nopout(p)
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}
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// addrToReg extracts the register from an Addr, handling special Addr.Names.
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@ -20,7 +20,26 @@ import (
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// fakeLabelName matches the RISCV_FAKE_LABEL_NAME from binutils.
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const fakeLabelName = ".L0 "
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func gentext(ctxt *ld.Link, ldr *loader.Loader) {}
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func gentext(ctxt *ld.Link, ldr *loader.Loader) {
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initfunc, addmoduledata := ld.PrepareAddmoduledata(ctxt)
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if initfunc == nil {
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return
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}
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// Emit the following function:
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//
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// go.link.addmoduledatainit:
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// auipc a0, %pcrel_hi(local.moduledata)
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// addi a0, %pcrel_lo(local.moduledata)
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// j runtime.addmoduledata
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sz := initfunc.AddSymRef(ctxt.Arch, ctxt.Moduledata, 0, objabi.R_RISCV_PCREL_ITYPE, 8)
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initfunc.SetUint32(ctxt.Arch, sz-8, 0x00000517) // auipc a0, %pcrel_hi(local.moduledata)
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initfunc.SetUint32(ctxt.Arch, sz-4, 0x00050513) // addi a0, %pcrel_lo(local.moduledata)
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sz = initfunc.AddSymRef(ctxt.Arch, addmoduledata, 0, objabi.R_RISCV_JAL, 4)
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initfunc.SetUint32(ctxt.Arch, sz-4, 0x0000006f) // j runtime.addmoduledata
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}
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func findHI20Reloc(ldr *loader.Loader, s loader.Sym, val int64) *loader.Reloc {
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outer := ldr.OuterSym(s)
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@ -208,7 +208,7 @@ func BuildModeSupported(compiler, buildmode, goos, goarch string) bool {
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case "plugin":
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switch platform {
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case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/loong64", "linux/s390x", "linux/ppc64le",
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case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/loong64", "linux/riscv64", "linux/s390x", "linux/ppc64le",
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"android/amd64", "android/386",
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"darwin/amd64", "darwin/arm64",
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"freebsd/amd64":
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@ -541,6 +541,15 @@ TEXT runtime·goexit(SB),NOSPLIT|NOFRAME|TOPFRAME,$0-0
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// traceback from goexit1 must hit code range of goexit
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MOV ZERO, ZERO // NOP
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// This is called from .init_array and follows the platform, not the Go ABI.
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TEXT runtime·addmoduledata(SB),NOSPLIT,$0-0
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// Use X31 as it is a scratch register in both the Go ABI and psABI.
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MOV runtime·lastmoduledatap(SB), X31
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MOV X10, moduledata_next(X31)
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MOV X10, runtime·lastmoduledatap(SB)
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RET
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// func cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
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// See cgocall.go for more details.
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TEXT ·cgocallback(SB),NOSPLIT,$24-24
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