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PowerPC64 DT_RELR

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PowerPC64 takes a more traditional approach to DT_RELR than x86.  Count
relative relocs in check_relocs, allocate space for them and output in
the usual places but not doing so when enable_dt_relr.  DT_RELR is
sized in the existing ppc stub relaxation machinery, run via the
linker's ldemul_after_allocation hook.  DT_RELR is output in the same
function that writes ppc stubs, run via ldemul_finish.

This support should be considered experimental.

bfd/
	* elf64-ppc.c (struct ppc_local_dyn_relocs): Renamed from
	ppc_dyn_relocs.  Add rel_count field.  Update uses.
	(struct ppc_dyn_relocs): New.  Replace all uses of elf_dyn_relocs.
	(struct ppc_link_hash_table): Add relr_alloc, relr_count and
	relr_addr.
	(ppc64_elf_copy_indirect_symbol): Merge rel_count.
	(ppc64_elf_check_relocs): Init rel_count for global and local syms.
	(dec_dynrel_count): Change r_info param to reloc pointer.  Update
	all callers.  Handle decrementing rel_count.
	(allocate_got): Don't allocate space for relative relocs when
	enable_dt_relr.
	(allocate_dynrelocs): Likewise.
	(ppc64_elf_size_dynamic_sections): Likewise.  Handle srelrdyn.
	(ppc_build_one_stub): Don't emit relative relocs on .branch_lt.
	(compare_relr_address, append_relr_off): New functions.
	(got_and_plt_relr_for_local_syms, got_and_plt_relr): Likewise.
	(ppc64_elf_size_stubs): Size .relr.syn.
	(ppc64_elf_build_stubs): Emit .relr.dyn.
	(build_global_entry_stubs_and_plt): Don't output relative relocs
	when enable_dt_relr.
	(write_plt_relocs_for_local_syms): Likewise.
	(ppc64_elf_relocate_section): Likewise.
binutils/
	* testsuite/lib/binutils-common.exp (supports_dt_relr): Add
	powerpc64.
ld/
	* emulparams/elf64ppc.sh: Source dt-relr.sh.
	* testsuite/ld-elf/dt-relr-2b.d: Adjust for powerpc.
	* testsuite/ld-elf/dt-relr-2c.d: Likewise.
	* testsuite/ld-elf/dt-relr-2d.d: Likewise.
	* testsuite/ld-elf/dt-relr-2e.d: Likewise.
This commit is contained in:
Alan Modra
2022-01-07 07:49:16 +10:30
parent 97da0e2677
commit 1657026ccd
7 changed files with 519 additions and 88 deletions
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4
binutils/testsuite/lib/binutils-common.exp
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@@ -429,7 +429,9 @@ proc supports_persistent_section {} {
# Whether a target support DT_RELR sections.
proc supports_dt_relr {} {
if { ([istarget x86_64-*-*] || [istarget i?86-*-*])
if { ([istarget x86_64-*-*]
|| [istarget i?86-*-*]
|| [istarget powerpc64*-*-*])
&& ([istarget *-*-linux*]
|| [istarget *-*-gnu*]) } {
return 1