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6a91be8666
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.
43 lines
1.2 KiB
Bash
43 lines
1.2 KiB
Bash
source_sh ${srcdir}/emulparams/plt_unwind.sh
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source_sh ${srcdir}/emulparams/extern_protected_data.sh
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source_sh ${srcdir}/emulparams/dynamic_undefined_weak.sh
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source_sh ${srcdir}/emulparams/call_nop.sh
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source_sh ${srcdir}/emulparams/cet.sh
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source_sh ${srcdir}/emulparams/x86-report-relative.sh
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source_sh ${srcdir}/emulparams/x86-64-level.sh
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source_sh ${srcdir}/emulparams/static.sh
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source_sh ${srcdir}/emulparams/dt-relr.sh
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SCRIPT_NAME=elf
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OUTPUT_FORMAT="elf32-i386"
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NO_RELA_RELOCS=yes
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TEXT_START_ADDR=0x08048000
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MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"
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COMMONPAGESIZE="CONSTANT (COMMONPAGESIZE)"
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ARCH=i386
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MACHINE=
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TEMPLATE_NAME=elf
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EXTRA_EM_FILE="elf-x86"
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GENERATE_SHLIB_SCRIPT=yes
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GENERATE_PIE_SCRIPT=yes
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NO_SMALL_DATA=yes
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SEPARATE_GOTPLT="SIZEOF (.got.plt) >= 12 ? 12 : 0"
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IREL_IN_PLT=
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# These sections are placed right after .plt section.
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OTHER_PLT_SECTIONS="
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.plt.got ${RELOCATING-0} : { *(.plt.got) }
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.plt.sec ${RELOCATING-0} : { *(.plt.sec) }
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"
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# Linux modify the default library search path to first include
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# a 32-bit specific directory.
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case "$target" in
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x86_64*-linux* | i[3-7]86*-linux*)
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case "$EMULATION_NAME" in
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*i386*)
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LIBPATH_SUFFIX=32
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LIBPATH_SUFFIX_SKIP=64
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;;
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esac
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;;
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esac
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