caa65211bb
The ld linker can transform indirect call to a locally defined function,
foo, via its GOT slot, to either "NOP call foo" or "call foo NOP" where
NOP is a 1-byte NOP padding. This patch adds a "-z call-nop=PADDING"
option to x86 ld to control 1-byte NOP padding for x86 call instruction.
PADDING is one of prefix-addr, prefix-nop, suffix-nop, prefix-NUMBER or
suffix-NUMBER.
bfd/
* elf32-i386.c (elf_i386_convert_load): Use call_nop_byte and
check call_nop_as_suffix for 1-byte NOP padding to pad call.
* elf64-x86-64.c (elf_x86_64_convert_load): Likewise.
include/
* bfdlink.h (bfd_link_info): Add call_nop_as_suffix and
call_nop_byte.
ld/
* ld/ld.texinfo: Document "-z call-nop=PADDING" option.
* emulparams/call_nop.sh: New file.
* emulparams/elf_i386_be.sh: Source
${srcdir}/emulparams/call_nop.sh.
* emulparams/elf_i386_chaos.sh: Likewise.
* emulparams/elf_i386_ldso.sh: Likewise.
* emulparams/elf_i386_vxworks.sh: Likewise.
* emulparams/elf_iamcu.sh: Likewise.
* emulparams/elf_k1om.sh: Likewise.
* emulparams/elf_l1om.sh: Likewise.
* emulparams/elf_x86_64.sh: Likewise.
* emultempl/elf32.em (gld${EMULATION_NAME}_before_parse): Set
link_info.call_nop_byte if $CALL_NOP_BYTE isn't empty.
ld/testsuite/
* ld-i386/call3.s: New file.
* ld-i386/call3a.d: Likewise.
* ld-i386/call3b.d: Likewise.
* ld-i386/call3c.d: Likewise.
* ld-i386/call3d.d: Likewise.
* ld-i386/call3e.d: Likewise.
* ld-i386/call3f.d: Likewise.
* ld-i386/call3g.d: Likewise.
* ld-i386/call3h.d: Likewise.
* ld-i386/load1-nacl.d: Likewise.
* ld-x86-64/call1.s: Likewise.
* ld-x86-64/call1a.d: Likewise.
* ld-x86-64/call1b.d: Likewise.
* ld-x86-64/call1c.d: Likewise.
* ld-x86-64/call1d.d: Likewise.
* ld-x86-64/call1e.d: Likewise.
* ld-x86-64/call1f.d: Likewise.
* ld-x86-64/call1g.d: Likewise.
* ld-x86-64/call1h.d: Likewise.
* ld-x86-64/call1i.d: Likewise.
* ld-x86-64/load1a-nacl.d: Likewise.
* ld-x86-64/load1b-nacl.d: Likewise.
* ld-x86-64/load1c-nacl.d: Likewise.
* ld-x86-64/load1d-nacl.d: Likewise.
58 lines
1.6 KiB
Bash
58 lines
1.6 KiB
Bash
. ${srcdir}/emulparams/plt_unwind.sh
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. ${srcdir}/emulparams/extern_protected_data.sh
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. ${srcdir}/emulparams/call_nop.sh
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SCRIPT_NAME=elf
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ELFSIZE=64
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OUTPUT_FORMAT="elf64-x86-64"
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NO_REL_RELOCS=yes
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TEXT_START_ADDR=0x400000
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MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"
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COMMONPAGESIZE="CONSTANT (COMMONPAGESIZE)"
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ARCH="i386:x86-64"
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MACHINE=
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TEMPLATE_NAME=elf32
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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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LARGE_SECTIONS=yes
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LARGE_BSS_AFTER_BSS=
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SEPARATE_GOTPLT="SIZEOF (.got.plt) >= 24 ? 24 : 0"
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IREL_IN_PLT=
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# Reuse TINY_READONLY_SECTION which is placed right after .plt section.
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TINY_READONLY_SECTION="
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.plt.got ${RELOCATING-0} : { *(.plt.got) }
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.plt.bnd ${RELOCATING-0} : { *(.plt.bnd) }
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"
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if [ "x${host}" = "x${target}" ]; then
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case " $EMULATION_LIBPATH " in
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*" ${EMULATION_NAME} "*)
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NATIVE=yes
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esac
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fi
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# Linux/Solaris modify the default library search path to first include
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# a 64-bit specific directory.
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case "$target" in
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x86_64*-linux*|i[3-7]86-*-linux-*)
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case "$EMULATION_NAME" in
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*64*)
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LIBPATH_SUFFIX=64
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PARSE_AND_LIST_OPTIONS_BNDPLT='
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fprintf (file, _("\
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-z bndplt Always generate BND prefix in PLT entries\n"));
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'
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PARSE_AND_LIST_ARGS_CASE_Z_BNDPLT='
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else if (strcmp (optarg, "bndplt") == 0)
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link_info.bndplt = TRUE;
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'
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PARSE_AND_LIST_OPTIONS="$PARSE_AND_LIST_OPTIONS $PARSE_AND_LIST_OPTIONS_BNDPLT"
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PARSE_AND_LIST_ARGS_CASE_Z="$PARSE_AND_LIST_ARGS_CASE_Z $PARSE_AND_LIST_ARGS_CASE_Z_BNDPLT"
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;;
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esac
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;;
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*-*-solaris2*)
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LIBPATH_SUFFIX=/amd64
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ELF_INTERPRETER_NAME=\"/lib/amd64/ld.so.1\"
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;;
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esac
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