tree 97b9b8802d2417a3530c2a328522de6e8bda3d90
parent a531bd5a59177dfef354df8b5b5b529a2a55d015
author Cherry Zhang <cherryyz@google.com> 1599152349 -0400
committer Cherry Zhang <cherryyz@google.com> 1599836846 +0000

cmd/link: put read-only data in __DATA_CONST segment

On darwin, we put read-only data in __TEXT segment on AMD64 in
exe (non-PIE) buildmode, and in __DATA on everywhere else. This
is not ideal: things in __DATA segment are not read-only, and
being mapped R/W may use more run-time resources.

In fact, newer darwin systems support a __DATA_CONST segment,
which the dynamic linker will map it read-only after applying
relocations. Use that.

Fixes #38830.

Change-Id: Ic281e6c6ca8ef5fec4bb7c5b71c50dd5393e78ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/253919
Reviewed-by: Than McIntosh <thanm@google.com>