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authorH.J. Lu <hjl.tools@gmail.com>2022-01-03 06:50:20 -0800
committerH.J. Lu <hjl.tools@gmail.com>2022-01-12 06:04:29 -0800
commit6a91be866619c592762cd7e9b034a9f7ad27ef37 (patch)
tree0e6f3c1cb84ecdee20857f3ba3f2087bf0425e06 /ld/ldlang.c
parente2cbf4df83fe57892a6aaedf737b84baa6321fa7 (diff)
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ld: Initial DT_RELR support
Add a -z pack-relative-relocs option to enable DT_RELR and create a relr.dyn section for DT_RELR. DT_RELR is implemented with the linker relaxation infrastructure, but it doesn't require the --relax option enabled. -z pack-relative-relocs implies -z combreloc. -z nocombreloc implies -z nopack-relative-relocs. -z pack-relative-relocs is chosen over the similar option in lld, --pack-dyn-relocs=relr, to implement a glibc binary lockout mechanism with a special glibc version symbol, to avoid random crashes of DT_RELR binaries with the existing glibc binaries. bfd/ * elf-bfd.h (elf_link_hash_table): Add srelrdyn. * elflink.c (_bfd_elf_link_create_dynamic_sections): Create a .relr.dyn section for DT_RELR. include/ * bfdlink.h (bfd_link_info): Add enable_dt_relr. ld/ * News: Mention -z pack-relative-relocs and -z nopack-relative-relocs. * ld.texi: Document -z pack-relative-relocs and -z nopack-relative-relocs. * ldelf.c (ldelf_after_parse): Disable DT_RELR if not building PIE nor shared library. Add 3 spare dynamic tags for DT_RELR, DT_RELRSZ and DT_RELRENT. * ldlang.c (lang_relax_sections): Also enable relaxation if DT_RELR is enabled. * emulparams/elf32_x86_64.sh: Source dt-relr.sh. * emulparams/elf_i386.sh: Likewise. * emulparams/elf_x86_64.sh: Likewise. * emulparams/dt-relr.sh: New file. * scripttempl/elf.sc: Support .relr.dyn.
Diffstat (limited to 'ld/ldlang.c')
-rw-r--r--ld/ldlang.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/ld/ldlang.c b/ld/ldlang.c
index 0af6c60..0a24fd8 100644
--- a/ld/ldlang.c
+++ b/ld/ldlang.c
@@ -7709,7 +7709,8 @@ lang_find_relro_sections (void)
void
lang_relax_sections (bool need_layout)
{
- if (RELAXATION_ENABLED)
+ /* NB: Also enable relaxation to layout sections for DT_RELR. */
+ if (RELAXATION_ENABLED || link_info.enable_dt_relr)
{
/* We may need more than one relaxation pass. */
int i = link_info.relax_pass;