dbd1e97e32
The changes to reorder sections for better relro protection on powerpc64,3e2b0f31,23283c1b, and5ad18f16, run into a problem with xlc. xlc -qdatalocal puts global variables into .toc, which means that .toc must be writable. The simplest way to accomplish this is to edit the linker script to remove .toc sections from .got on detecting xlc object files. bfd/ * elf64-ppc.h (struct ppc64_elf_params): Add "object_in_toc". * elf64-ppc.c (ppc64_elf_add_symbol_hook): Assume that global symbols in .toc indicate xlc compiled code that might require a rw .toc. ld/ * emulparams/elf64ppc.sh (INITIAL_READWRITE_SECTIONS): Define. * emultempl/ppc64elf.em (params): Init new field. (ppc_after_open): New function. (LDEMUL_AFTER_OPEN): Define. * ldlang.c (lang_final): Whitespace fix. ld/testsuite/ * ld-powerpc/tocvar.d, * ld-powerpc/tocvar.s: New test. * ld-powerpc/tocnovar.d, * ld-powerpc/tocnovar.s: New test. * ld-powerpc/powerpc.exp: Run tocvar and tocnovar.
51 lines
1.6 KiB
Bash
51 lines
1.6 KiB
Bash
. ${srcdir}/emulparams/elf32ppccommon.sh
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. ${srcdir}/emulparams/plt_unwind.sh
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EXTRA_EM_FILE=ppc64elf
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ELFSIZE=64
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OUTPUT_FORMAT="elf64-powerpc"
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TEXT_START_ADDR=0x10000000
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#SEGMENT_SIZE=0x10000000
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ARCH=powerpc:common64
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NOP=0x60000000
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unset EXECUTABLE_SYMBOLS
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unset SDATA_START_SYMBOLS
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unset SDATA2_START_SYMBOLS
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unset SBSS_START_SYMBOLS
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unset SBSS_END_SYMBOLS
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unset OTHER_END_SYMBOLS
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unset OTHER_RELRO_SECTIONS
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OTHER_TEXT_SECTIONS="*(.sfpr .glink)"
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OTHER_SDATA_SECTIONS="
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.tocbss ${RELOCATING-0} :${RELOCATING+ ALIGN(8)} { *(.tocbss)}"
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if test x${RELOCATING+set} = xset; then
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GOT="
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.got : ALIGN(8) { *(.got .toc) }"
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else
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GOT="
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.got 0 : { *(.got) }
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.toc 0 : { *(.toc) }"
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fi
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# Put .opd relocs first so ld.so will process them before any ifunc relocs.
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INITIAL_RELOC_SECTIONS="
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.rela.opd ${RELOCATING-0} : { *(.rela.opd) }"
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OTHER_GOT_RELOC_SECTIONS="
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.rela.toc ${RELOCATING-0} : { *(.rela.toc) }
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.rela.toc1 ${RELOCATING-0} : { *(.rela.toc1) }
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.rela.tocbss ${RELOCATING-0} : { *(.rela.tocbss) }
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.rela.branch_lt ${RELOCATING-0} : { *(.rela.branch_lt) }"
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OTHER_RELRO_SECTIONS_2="
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.opd ${RELOCATING-0} :${RELOCATING+ ALIGN(8)} { KEEP (*(.opd)) }
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.toc1 ${RELOCATING-0} :${RELOCATING+ ALIGN(8)} { *(.toc1) }
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.branch_lt ${RELOCATING-0} :${RELOCATING+ ALIGN(8)} { *(.branch_lt) }"
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INITIAL_READWRITE_SECTIONS="
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.toc ${RELOCATING-0} :${RELOCATING+ ALIGN(8)} { *(.toc) }"
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# Put .got before .data
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DATA_GOT=" "
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# Always make .got read-only after relocation
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SEPARATE_GOTPLT=0
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# Also put .sdata before .data
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DATA_SDATA=" "
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# and .plt/.iplt before .data
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DATA_PLT=
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PLT_BEFORE_GOT=" "
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