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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.
18 lines
465 B
Makefile
18 lines
465 B
Makefile
#source: dt-relr-2.s
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#ld: -e _start -pie $DT_RELR_LDFLAGS
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#readelf: -rW -d
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#target: [supports_dt_relr]
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#...
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0x[0-9a-f]+ \(RELR\) +0x[0-9a-f]+
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0x[0-9a-f]+ \(RELRSZ\) +(8|16) \(bytes\)
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0x[0-9a-f]+ \(RELRENT\) +(4|8) \(bytes\)
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#...
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Relocation section '\.rel(a|)\.dyn' at offset 0x[0-9a-f]+ contains 1 entry:
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#...
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[0-9a-f]+ +[0-9a-f]+ +R_.*_(RELATIVE|UADDR.*) .*
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#...
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Relocation section '\.relr\.dyn' at offset 0x[0-9a-f]+ contains 2 entries:
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4 offsets
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#pass
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