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cmd/link: resolve ABI alias for runtime.unreachableMethod

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We redirect references to unreachable methods to
runtime.unreachableMethod. We choose to use ABIInternal symbol
for this, because runtime.unreachableMethod is a defined Go
function.

When linking against shared libraries, and ABI wrappers are not
enabled, the imported function symbols are all ABI0 and aliased
to ABIInternal. We need to resolve ABI alias in this case.

Change-Id: Idd64ef46ce0b5f54882ea0069ce0d59dc9b7a599
Reviewed-on: https://go-review.googlesource.com/c/go/+/319891
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Cherry Mui 2021-05-13 16:36:32 -04:00
parent 7a7624a3fa
commit 92c189f211
1 changed files with 2 additions and 0 deletions
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2
src/cmd/link/internal/ld/data.go
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@ -340,6 +340,7 @@ func (st *relocSymState) relocsym(s loader.Sym, P []byte) {
if weak && !ldr.AttrReachable(rs) {
// Redirect it to runtime.unreachableMethod, which will throw if called.
rs = syms.unreachableMethod
rs = ldr.ResolveABIAlias(rs)
}
if target.IsExternal() {
nExtReloc++
@ -623,6 +624,7 @@ func extreloc(ctxt *Link, ldr *loader.Loader, s loader.Sym, r loader.Reloc) (loa
rs := ldr.ResolveABIAlias(r.Sym())
if r.Weak() && !ldr.AttrReachable(rs) {
rs = ctxt.ArchSyms.unreachableMethod
rs = ldr.ResolveABIAlias(rs)
}
rs, off := FoldSubSymbolOffset(ldr, rs)
rr.Xadd = r.Add() + off