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x86-64: Add TLSDESC fields to elf_x86_lazy_plt_layout
ENDBR64 is added to the special TLSDESC entry, which is similar to the PLT0 entry, in the x86-64 lazy procedure linkage table to support Intel CET. The NaCl PLT is different from the normal PLT. This patch adds plt_tlsdesc_entry, plt_tlsdesc_entry_size, plt_tlsdesc_got1_offset, plt_tlsdesc_got2_offset, plt_tlsdesc_got1_insn_end and plt_tlsdesc_got2_insn_end to elf_x86_lazy_plt_layout to support both normal and NaCl TLSDESC entries. This fixed FAIL: TLS descriptor -fpic -shared transitions for x86_64-nacl. * elf32-i386.c (elf_i386_lazy_plt): Add plt_tlsdesc_entry, plt_tlsdesc_entry_size, plt_tlsdesc_got1_offset, plt_tlsdesc_got2_offset, plt_tlsdesc_got1_insn_end and plt_tlsdesc_got2_insn_end for TLSDESC entry. (elf_i386_lazy_ibt_plt): Likewise. (elf_i386_nacl_plt): Likewise. * elf64-x86-64.c (tlsdesc_plt_entry): Moved and renamed to ... (elf_x86_64_tlsdesc_plt_entry): This. (elf_x86_64_lazy_plt): Add plt_tlsdesc_entry, plt_tlsdesc_entry_size, plt_tlsdesc_got1_offset, plt_tlsdesc_got2_offset, plt_tlsdesc_got1_insn_end and plt_tlsdesc_got2_insn_end for TLSDESC entry. (elf_x86_64_lazy_bnd_plt): Likewise. (elf_x86_64_lazy_ibt_plt): Likewise. (elf_x32_lazy_ibt_plt): Likewise. (elf_x86_64_nacl_plt): Likewise. (elf_x86_64_finish_dynamic_sections): Use plt_tlsdesc_entry, plt_tlsdesc_entry_size, plt_tlsdesc_got1_offset, plt_tlsdesc_got2_offset, plt_tlsdesc_got1_insn_end and plt_tlsdesc_got2_insn_end to update TLSDESC entry. * elfxx-x86.h (elf_x86_lazy_plt_layout): Update comments. Add plt_tlsdesc_entry, plt_tlsdesc_entry_size, plt_tlsdesc_got1_offset, plt_tlsdesc_got2_offset, plt_tlsdesc_got1_insn_end and plt_tlsdesc_got2_insn_end. (elf_x86_non_lazy_plt_layout): Update comments. (elf_x86_plt_layout): Likewise.
This commit is contained in:
H.J. Lu
parent
ac98f9e227
commit
92e68c1d65
@ -1,3 +1,32 @@
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2018-05-28 H.J. Lu <hongjiu.lu@intel.com>
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* elf32-i386.c (elf_i386_lazy_plt): Add plt_tlsdesc_entry,
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plt_tlsdesc_entry_size, plt_tlsdesc_got1_offset,
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plt_tlsdesc_got2_offset, plt_tlsdesc_got1_insn_end and
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plt_tlsdesc_got2_insn_end for TLSDESC entry.
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(elf_i386_lazy_ibt_plt): Likewise.
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(elf_i386_nacl_plt): Likewise.
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* elf64-x86-64.c (tlsdesc_plt_entry): Moved and renamed to ...
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(elf_x86_64_tlsdesc_plt_entry): This.
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(elf_x86_64_lazy_plt): Add plt_tlsdesc_entry,
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plt_tlsdesc_entry_size, plt_tlsdesc_got1_offset,
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plt_tlsdesc_got2_offset, plt_tlsdesc_got1_insn_end and
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plt_tlsdesc_got2_insn_end for TLSDESC entry.
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(elf_x86_64_lazy_bnd_plt): Likewise.
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(elf_x86_64_lazy_ibt_plt): Likewise.
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(elf_x32_lazy_ibt_plt): Likewise.
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(elf_x86_64_nacl_plt): Likewise.
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(elf_x86_64_finish_dynamic_sections): Use plt_tlsdesc_entry,
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plt_tlsdesc_entry_size, plt_tlsdesc_got1_offset,
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plt_tlsdesc_got2_offset, plt_tlsdesc_got1_insn_end and
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plt_tlsdesc_got2_insn_end to update TLSDESC entry.
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* elfxx-x86.h (elf_x86_lazy_plt_layout): Update comments.
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Add plt_tlsdesc_entry, plt_tlsdesc_entry_size,
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plt_tlsdesc_got1_offset, plt_tlsdesc_got2_offset,
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plt_tlsdesc_got1_insn_end and plt_tlsdesc_got2_insn_end.
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(elf_x86_non_lazy_plt_layout): Update comments.
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(elf_x86_plt_layout): Likewise.
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2018-05-28 H.J. Lu <hongjiu.lu@intel.com>
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PR ld/23238
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@ -766,6 +766,12 @@ static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
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sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
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elf_i386_lazy_plt_entry, /* plt_entry */
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LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
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NULL, /* plt_tlsdesc_entry */
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0, /* plt_tlsdesc_entry_size*/
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0, /* plt_tlsdesc_got1_offset */
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0, /* plt_tlsdesc_got2_offset */
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0, /* plt_tlsdesc_got1_insn_end */
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0, /* plt_tlsdesc_got2_insn_end */
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2, /* plt0_got1_offset */
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8, /* plt0_got2_offset */
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0, /* plt0_got2_insn_end */
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@ -798,6 +804,12 @@ static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
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sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
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elf_i386_lazy_ibt_plt_entry, /* plt_entry */
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LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
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NULL, /* plt_tlsdesc_entry */
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0, /* plt_tlsdesc_entry_size*/
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0, /* plt_tlsdesc_got1_offset */
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0, /* plt_tlsdesc_got2_offset */
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0, /* plt_tlsdesc_got1_insn_end */
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0, /* plt_tlsdesc_got2_insn_end */
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2, /* plt0_got1_offset */
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8, /* plt0_got2_offset */
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0, /* plt0_got2_insn_end */
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@ -4728,6 +4740,12 @@ static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
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sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
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elf_i386_nacl_plt_entry, /* plt_entry */
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NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
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NULL, /* plt_tlsdesc_entry */
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0, /* plt_tlsdesc_entry_size*/
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0, /* plt_tlsdesc_got1_offset */
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0, /* plt_tlsdesc_got2_offset */
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0, /* plt_tlsdesc_got1_insn_end */
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0, /* plt_tlsdesc_got2_insn_end */
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2, /* plt0_got1_offset */
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8, /* plt0_got2_offset */
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0, /* plt0_got2_insn_end */
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@ -660,6 +660,14 @@ static const bfd_byte elf_x32_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
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0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
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};
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/* The TLSDESC entry in a lazy procedure linkage table. */
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static const bfd_byte elf_x86_64_tlsdesc_plt_entry[LAZY_PLT_ENTRY_SIZE] =
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{
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0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
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0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
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0xff, 0x25, 16, 0, 0, 0 /* jmpq *GOT+TDG(%rip) */
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};
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/* .eh_frame covering the lazy .plt section. */
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static const bfd_byte elf_x86_64_eh_frame_lazy_plt[] =
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@ -834,6 +842,12 @@ static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt =
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LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
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elf_x86_64_lazy_plt_entry, /* plt_entry */
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LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
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elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */
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LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */
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6, /* plt_tlsdesc_got1_offset */
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12, /* plt_tlsdesc_got2_offset */
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10, /* plt_tlsdesc_got1_insn_end */
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16, /* plt_tlsdesc_got2_insn_end */
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2, /* plt0_got1_offset */
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8, /* plt0_got2_offset */
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12, /* plt0_got2_insn_end */
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@ -866,6 +880,12 @@ static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt =
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LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
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elf_x86_64_lazy_bnd_plt_entry, /* plt_entry */
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LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
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elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */
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LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */
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6, /* plt_tlsdesc_got1_offset */
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12, /* plt_tlsdesc_got2_offset */
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10, /* plt_tlsdesc_got1_insn_end */
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16, /* plt_tlsdesc_got2_insn_end */
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2, /* plt0_got1_offset */
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1+8, /* plt0_got2_offset */
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1+12, /* plt0_got2_insn_end */
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@ -898,6 +918,12 @@ static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt =
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LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
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elf_x86_64_lazy_ibt_plt_entry, /* plt_entry */
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LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
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elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */
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LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */
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6, /* plt_tlsdesc_got1_offset */
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12, /* plt_tlsdesc_got2_offset */
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10, /* plt_tlsdesc_got1_insn_end */
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16, /* plt_tlsdesc_got2_insn_end */
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2, /* plt0_got1_offset */
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1+8, /* plt0_got2_offset */
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1+12, /* plt0_got2_insn_end */
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@ -919,6 +945,12 @@ static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt =
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LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
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elf_x32_lazy_ibt_plt_entry, /* plt_entry */
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LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
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elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */
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LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */
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6, /* plt_tlsdesc_got1_offset */
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12, /* plt_tlsdesc_got2_offset */
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10, /* plt_tlsdesc_got1_insn_end */
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16, /* plt_tlsdesc_got2_insn_end */
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2, /* plt0_got1_offset */
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8, /* plt0_got2_offset */
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12, /* plt0_got2_insn_end */
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@ -4417,19 +4449,12 @@ elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
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if (htab->tlsdesc_plt)
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{
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/* The TLSDESC entry in a lazy procedure linkage table. */
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static const bfd_byte tlsdesc_plt_entry[LAZY_PLT_ENTRY_SIZE] =
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{
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0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
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0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
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0xff, 0x25, 16, 0, 0, 0 /* jmpq *GOT+TDG(%rip) */
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};
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bfd_put_64 (output_bfd, (bfd_vma) 0,
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htab->elf.sgot->contents + htab->tlsdesc_got);
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memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
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tlsdesc_plt_entry, LAZY_PLT_ENTRY_SIZE);
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htab->lazy_plt->plt_tlsdesc_entry,
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htab->lazy_plt->plt_tlsdesc_entry_size);
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/* Add offset for pushq GOT+8(%rip), since ENDBR64 uses 4
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bytes and the instruction uses 6 bytes, subtract these
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@ -4441,10 +4466,10 @@ elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
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- htab->elf.splt->output_section->vma
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- htab->elf.splt->output_offset
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- htab->tlsdesc_plt
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- 4 - 6),
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- htab->lazy_plt->plt_tlsdesc_got1_insn_end),
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(htab->elf.splt->contents
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+ htab->tlsdesc_plt
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+ 4 + 2));
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+ htab->lazy_plt->plt_tlsdesc_got1_offset));
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/* Add offset for indirect branch via GOT+TDG, where TDG
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stands for htab->tlsdesc_got, subtracting the offset
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to the end of that instruction. */
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@ -4455,9 +4480,10 @@ elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
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- htab->elf.splt->output_section->vma
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- htab->elf.splt->output_offset
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- htab->tlsdesc_plt
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- 4 - 6 - 6),
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- htab->lazy_plt->plt_tlsdesc_got2_insn_end),
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(htab->elf.splt->contents
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+ htab->tlsdesc_plt + 4 + 6 + 2));
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+ htab->tlsdesc_plt
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+ htab->lazy_plt->plt_tlsdesc_got2_offset));
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}
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}
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@ -5246,6 +5272,12 @@ static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt =
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NACL_PLT_ENTRY_SIZE, /* plt0_entry_size */
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elf_x86_64_nacl_plt_entry, /* plt_entry */
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NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
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elf_x86_64_nacl_plt0_entry, /* plt_tlsdesc_entry */
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NACL_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */
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2, /* plt_tlsdesc_got1_offset */
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9, /* plt_tlsdesc_got2_offset */
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6, /* plt_tlsdesc_got1_insn_end */
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13, /* plt_tlsdesc_got2_insn_end */
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2, /* plt0_got1_offset */
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9, /* plt0_got2_offset */
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13, /* plt0_got2_insn_end */
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@ -285,16 +285,30 @@ struct elf_x86_link_hash_entry
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struct elf_x86_lazy_plt_layout
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{
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/* The first entry in an absolute lazy procedure linkage table looks
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like this. */
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/* The first entry in a lazy procedure linkage table looks like this. */
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const bfd_byte *plt0_entry;
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unsigned int plt0_entry_size; /* Size of PLT0 entry. */
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/* Later entries in an absolute lazy procedure linkage table look
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like this. */
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/* Later entries in a lazy procedure linkage table look like this. */
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const bfd_byte *plt_entry;
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unsigned int plt_entry_size; /* Size of each PLT entry. */
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/* The TLSDESC entry in a lazy procedure linkage table looks like
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this. This is for x86-64 only. */
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const bfd_byte *plt_tlsdesc_entry;
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unsigned int plt_tlsdesc_entry_size; /* Size of TLSDESC entry. */
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/* Offsets into the TLSDESC entry that are to be replaced with
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GOT+8 and GOT+TDG. These are for x86-64 only. */
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unsigned int plt_tlsdesc_got1_offset;
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unsigned int plt_tlsdesc_got2_offset;
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/* Offset of the end of the PC-relative instructions containing
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plt_tlsdesc_got1_offset and plt_tlsdesc_got2_offset. These
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are for x86-64 only. */
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unsigned int plt_tlsdesc_got1_insn_end;
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unsigned int plt_tlsdesc_got2_insn_end;
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/* Offsets into plt0_entry that are to be replaced with GOT[1] and
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GOT[2]. */
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unsigned int plt0_got1_offset;
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@ -336,10 +350,11 @@ struct elf_x86_lazy_plt_layout
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struct elf_x86_non_lazy_plt_layout
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{
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/* Entries in an absolute non-lazy procedure linkage table look like
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this. */
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/* Entries in a non-lazy procedure linkage table look like this. */
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const bfd_byte *plt_entry;
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/* Entries in a PIC non-lazy procedure linkage table look like this. */
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/* Entries in a PIC non-lazy procedure linkage table look like this.
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This is only used for i386 where absolute PLT and PIC PLT are
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different. */
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const bfd_byte *pic_plt_entry;
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unsigned int plt_entry_size; /* Size of each PLT entry. */
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@ -358,9 +373,7 @@ struct elf_x86_non_lazy_plt_layout
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struct elf_x86_plt_layout
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{
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/* The first entry in a lazy procedure linkage table looks like this.
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This is only used for i386 where absolute PLT0 and PIC PLT0 are
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different. */
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/* The first entry in a lazy procedure linkage table looks like this. */
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const bfd_byte *plt0_entry;
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/* Entries in a procedure linkage table look like this. */
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const bfd_byte *plt_entry;
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