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cmd/link: introduce a rel.ro segment

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When internally linking with using rel.ro sections, this segment covers
the sections. To do this, move to other read-only sections, SELFROSECT
and SMACHOPLT, out of the way.

Part of adding PIE internal linking on linux/amd64.

Change-Id: I4fb3d180e92f7e801789ab89864010faf5a2cb6d
Reviewed-on: https://go-review.googlesource.com/28538
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
David Crawshaw 2016-09-05 23:29:16 -04:00
parent 13dc4d378b
commit 276803d611
11 changed files with 168 additions and 72 deletions
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11
src/cmd/internal/obj/link.go
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@ -384,6 +384,7 @@ const (
STEXT
SELFRXSECT
// Read-only sections.
STYPE
SSTRING
SGOSTRING
@ -393,6 +394,11 @@ const (
SRODATA
SFUNCTAB
SELFROSECT
SMACHOPLT
// Read-only sections with relocations.
//
// Types STYPE-SFUNCTAB above are written to the .rodata section by default.
// When linking a shared object, some conceptually "read only" types need to
// be written to by relocations and putting them in a section called
@ -412,12 +418,13 @@ const (
SRODATARELRO
SFUNCTABRELRO
// Part of .data.rel.ro if it exists, otherwise part of .rodata.
STYPELINK
SITABLINK
SSYMTAB
SPCLNTAB
SELFROSECT
SMACHOPLT
// Writable sections.
SELFSECT
SMACHO
SMACHOGOT