[go] cmd/link: support PIE on linux/s390x without cgo

[Quim Muntal (Gerrit)]

Quim Muntal submitted the change

Change information

Commit message:

cmd/link: support PIE on linux/s390x without cgo

Enable PIE builds on linux/s390x when CGO is disabled by teaching
the linker to handle dynamic relocations against SDYNIMPORT
symbols.

This adds support for TLS_IE and handles R_CALL, R_PCRELDBL, and
R_ADDR relocations by generating the appropriate PLT/GOT entries
instead of rejecting them as unsupported.

Fixes #77449

Cq-Include-Trybots: luci.golang.try:gotip-linux-s390x

Change-Id: Ib6586780073fedbcbd42b9a2c554a99dd7386aa6

Reviewed-on: https://go-review.googlesource.com/c/go/+/742342

Reviewed-by: Cherry Mui <cher...@google.com>

Reviewed-by: Quim Muntal <quimm...@gmail.com>

Reviewed-by: Junyang Shao <shaoj...@google.com>

LUCI-TryBot-Result: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Files:

• M src/cmd/dist/test.go
• M src/cmd/link/internal/ld/elf.go
• M src/cmd/link/internal/s390x/asm.go
• M src/cmd/link/internal/s390x/obj.go
• M src/internal/platform/supported.go

Change size: M

Delta: 5 files changed, 167 insertions(+), 24 deletions(-)

Branch: refs/heads/master

Submit Requirements:

• Code-Review: +2 by Cherry Mui, +1 by Junyang Shao, +1 by Quim Muntal
• TryBots-Pass: LUCI-TryBot-Result+1 by Go LUCI

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Gerrit

Gerrit-MessageType: merged

Gerrit-Project: go

Gerrit-Branch: master

Gerrit-Change-Id: Ib6586780073fedbcbd42b9a2c554a99dd7386aa6

Gerrit-Change-Number: 742342

Gerrit-PatchSet: 12

Gerrit-Owner: George Adams <georgea...@gmail.com>

Gerrit-Reviewer: Cherry Mui <cher...@google.com>

Gerrit-Reviewer: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Gerrit-Reviewer: Junyang Shao <shaoj...@google.com>

Gerrit-Reviewer: Quim Muntal <quimm...@gmail.com>

Gerrit-Reviewer: Srinivas Pokala <Pokala....@ibm.com>