| commit | 7b04d81cbc2e45172c17e62943a777286a3341be | [log] [tgz] |
|---|---|---|
| author | Cherry Mui <cherryyz@google.com> | Fri Oct 06 20:53:27 2023 -0400 |
| committer | Cherry Mui <cherryyz@google.com> | Mon Oct 30 20:36:26 2023 +0000 |
| tree | 54de14373fcd4074b45ce84caa62c1587815c922 | |
| parent | f9a31cda3c8a92e81989af4167c9ae5bfbb8ea5e [diff] |
[release-branch.go1.21] runtime/cgo: avoid taking the address of crosscall2 in code Currently, set_crosscall2 takes the address of crosscall2 without using the GOT, which, on some architectures, results in a PC-relative relocation (e.g. R_AARCH64_ADR_PREL_PG_HI21 on ARM64) to the crosscall2 symbol. But crosscall2 is dynamically exported, so the C linker thinks it may bind to a symbol from a different DSO. Some C linker may not like a PC-relative relocation to such a symbol. Using a local trampoline to avoid taking the address of a dynamically exported symbol. It may be possible to not dynamically export crosscall2. But this CL is safer for backport. Later we may remove the trampolines after unexport crosscall2, if they are not needed. Fixes #63509. Updates #62556. Change-Id: Id28457f65ef121d3f87d8189803abc65ed453283 Reviewed-on: https://go-review.googlesource.com/c/go/+/533535 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Ian Lance Taylor <iant@google.com> (cherry picked from commit 872d7181f4084461441787c70ffd1354314987af) Reviewed-on: https://go-review.googlesource.com/c/go/+/534915 Reviewed-by: David Chase <drchase@google.com>
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