[ARM] Add TLS relocations for FDPIC.
Define and handle TLS relocations for FDPIC in BFD and gas. In gas, the new relocations are rejected if the --fdpic option was not specified. We also define the __tdata_start symbol to mark the start of the .tdata section. This allows FDPIC static binaries to find the start of .tdata section, since phdr->p_vaddr of TLS segment is not a valid value for FDPIC. 2018-04-25 Christophe Lyon <christophe.lyon@st.com> Mickaël Guêné <mickael.guene@st.com> bfd/: * bfd-in2.h (BFD_RELOC_ARM_TLS_GD32_FDPIC) (BFD_RELOC_ARM_TLS_LDM32_FDPIC, BFD_RELOC_ARM_TLS_IE32_FDPIC): New relocations. * elf32-arm.c (elf32_arm_howto_table_2): Add R_ARM_TLS_GD32_FDPIC, R_ARM_TLS_LDM32_FDPIC, R_ARM_TLS_IE32_FDPIC relocations. (elf32_arm_reloc_map): Add R_ARM_TLS_GD32_FDPIC, R_ARM_TLS_LDM32_FDPIC, R_ARM_TLS_IE32_FDPIC. (struct elf32_arm_link_hash_table): Update comment. (elf32_arm_final_link_relocate): Handle TLS FDPIC relocations. (IS_ARM_TLS_RELOC): Likewise. (elf32_arm_check_relocs): Likewise. (allocate_dynrelocs_for_symbol): Likewise. (elf32_arm_size_dynamic_sections): Update comment. * reloc.c: Add BFD_RELOC_ARM_TLS_GD32_FDPIC, BFD_RELOC_ARM_TLS_LDM32_FDPIC, BFD_RELOC_ARM_TLS_IE32_FDPIC. gas/ * config/tc-arm.c (reloc_names): Add TLSGD_FDPIC, TLSLDM_FDPIC, GOTTPOFF_FDIC relocations. (md_apply_fix): Handle the new TLS FDPIC relocations. (tc_gen_reloc): Likewise. (arm_fix_adjustable): Likewise. include/ * elf/arm.h: Add R_ARM_TLS_GD32_FDPIC, R_ARM_TLS_LDM32_FDPIC, R_ARM_TLS_IE32_FDPIC. ld/ * scripttempl/elf.sc: Define __tdata_start for .tdata section.
This commit is contained in:
Christophe Lyon
Christophe Lyon
parent
7801f98f84
commit
5c5a4843ec
10 changed files with 148 additions and 14 deletions
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@ -1,3 +1,22 @@
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2018-04-25 Christophe Lyon <christophe.lyon@st.com>
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Mickaël Guêné <mickael.guene@st.com>
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* bfd-in2.h (BFD_RELOC_ARM_TLS_GD32_FDPIC)
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(BFD_RELOC_ARM_TLS_LDM32_FDPIC, BFD_RELOC_ARM_TLS_IE32_FDPIC): New
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relocations.
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* elf32-arm.c (elf32_arm_howto_table_2): Add R_ARM_TLS_GD32_FDPIC,
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R_ARM_TLS_LDM32_FDPIC, R_ARM_TLS_IE32_FDPIC relocations.
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(elf32_arm_reloc_map): Add R_ARM_TLS_GD32_FDPIC,
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R_ARM_TLS_LDM32_FDPIC, R_ARM_TLS_IE32_FDPIC.
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(struct elf32_arm_link_hash_table): Update comment.
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(elf32_arm_final_link_relocate): Handle TLS FDPIC relocations.
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(IS_ARM_TLS_RELOC): Likewise.
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(elf32_arm_check_relocs): Likewise.
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(allocate_dynrelocs_for_symbol): Likewise.
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(elf32_arm_size_dynamic_sections): Update comment.
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* reloc.c: Add BFD_RELOC_ARM_TLS_GD32_FDPIC,
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BFD_RELOC_ARM_TLS_LDM32_FDPIC, BFD_RELOC_ARM_TLS_IE32_FDPIC.
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2018-04-25 Christophe Lyon <christophe.lyon@st.com>
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Mickaël Guêné <mickael.guene@st.com>
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@ -3531,6 +3531,9 @@ pc-relative or some form of GOT-indirect relocation. */
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BFD_RELOC_ARM_GOTOFFFUNCDESC,
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BFD_RELOC_ARM_FUNCDESC,
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BFD_RELOC_ARM_FUNCDESC_VALUE,
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BFD_RELOC_ARM_TLS_GD32_FDPIC,
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BFD_RELOC_ARM_TLS_LDM32_FDPIC,
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BFD_RELOC_ARM_TLS_IE32_FDPIC,
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/* Relocations for setting up GOTs and PLTs for shared libraries. */
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BFD_RELOC_ARM_JUMP_SLOT,
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@ -1746,7 +1746,7 @@ static reloc_howto_type elf32_arm_howto_table_1[] =
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};
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/* 160 onwards: */
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static reloc_howto_type elf32_arm_howto_table_2[5] =
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static reloc_howto_type elf32_arm_howto_table_2[8] =
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{
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HOWTO (R_ARM_IRELATIVE, /* type */
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0, /* rightshift */
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@ -1813,6 +1813,45 @@ static reloc_howto_type elf32_arm_howto_table_2[5] =
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0, /* src_mask */
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0xffffffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_ARM_TLS_GD32_FDPIC, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_ARM_TLS_GD32_FDPIC",/* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0xffffffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_ARM_TLS_LDM32_FDPIC, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_ARM_TLS_LDM32_FDPIC",/* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0xffffffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_ARM_TLS_IE32_FDPIC, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_ARM_TLS_IE32_FDPIC",/* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0xffffffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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};
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/* 249-255 extended, currently unused, relocations: */
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@ -1970,6 +2009,9 @@ static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
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{BFD_RELOC_ARM_GOTOFFFUNCDESC, R_ARM_GOTOFFFUNCDESC},
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{BFD_RELOC_ARM_FUNCDESC, R_ARM_FUNCDESC},
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{BFD_RELOC_ARM_FUNCDESC_VALUE, R_ARM_FUNCDESC_VALUE},
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{BFD_RELOC_ARM_TLS_GD32_FDPIC, R_ARM_TLS_GD32_FDPIC},
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{BFD_RELOC_ARM_TLS_LDM32_FDPIC, R_ARM_TLS_LDM32_FDPIC},
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{BFD_RELOC_ARM_TLS_IE32_FDPIC, R_ARM_TLS_IE32_FDPIC},
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{BFD_RELOC_VTABLE_INHERIT, R_ARM_GNU_VTINHERIT},
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{BFD_RELOC_VTABLE_ENTRY, R_ARM_GNU_VTENTRY},
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{BFD_RELOC_ARM_MOVW, R_ARM_MOVW_ABS_NC},
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@ -3280,7 +3322,7 @@ struct elf32_arm_link_hash_table
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/* Offset in .plt section of tls_arm_trampoline. */
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bfd_vma tls_trampoline;
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/* Data for R_ARM_TLS_LDM32 relocations. */
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/* Data for R_ARM_TLS_LDM32/R_ARM_TLS_LDM32_FDPIC relocations. */
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union
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{
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bfd_signed_vma refcount;
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@ -11523,6 +11565,7 @@ elf32_arm_final_link_relocate (reloc_howto_type * howto,
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rel->r_addend);
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case R_ARM_TLS_LDM32:
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case R_ARM_TLS_LDM32_FDPIC:
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{
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bfd_vma off;
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@ -11561,7 +11604,7 @@ elf32_arm_final_link_relocate (reloc_howto_type * howto,
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globals->tls_ldm_got.offset |= 1;
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}
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if (globals->fdpic_p)
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if (r_type == R_ARM_TLS_LDM32_FDPIC)
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{
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bfd_put_32(output_bfd,
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globals->root.sgot->output_offset + off,
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@ -11584,7 +11627,9 @@ elf32_arm_final_link_relocate (reloc_howto_type * howto,
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case R_ARM_TLS_CALL:
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case R_ARM_THM_TLS_CALL:
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case R_ARM_TLS_GD32:
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case R_ARM_TLS_GD32_FDPIC:
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case R_ARM_TLS_IE32:
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case R_ARM_TLS_IE32_FDPIC:
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case R_ARM_TLS_GOTDESC:
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case R_ARM_TLS_DESCSEQ:
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case R_ARM_THM_TLS_DESCSEQ:
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@ -11772,7 +11817,7 @@ elf32_arm_final_link_relocate (reloc_howto_type * howto,
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local_got_offsets[r_symndx] |= 1;
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}
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if ((tls_type & GOT_TLS_GD) && r_type != R_ARM_TLS_GD32)
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if ((tls_type & GOT_TLS_GD) && r_type != R_ARM_TLS_GD32 && r_type != R_ARM_TLS_GD32_FDPIC)
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off += 8;
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else if (tls_type & GOT_TLS_GDESC)
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off = offplt;
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@ -11931,8 +11976,8 @@ elf32_arm_final_link_relocate (reloc_howto_type * howto,
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- (input_section->output_section->vma
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+ input_section->output_offset + rel->r_offset));
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if (globals->fdpic_p && (r_type == R_ARM_TLS_GD32 ||
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r_type == R_ARM_TLS_IE32))
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if (globals->fdpic_p && (r_type == R_ARM_TLS_GD32_FDPIC ||
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r_type == R_ARM_TLS_IE32_FDPIC))
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{
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/* For FDPIC relocations, resolve to the offset of the GOT
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entry from the start of GOT. */
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@ -12845,13 +12890,16 @@ arm_add_to_rel (bfd * abfd,
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#define IS_ARM_TLS_RELOC(R_TYPE) \
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((R_TYPE) == R_ARM_TLS_GD32 \
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|| (R_TYPE) == R_ARM_TLS_GD32_FDPIC \
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|| (R_TYPE) == R_ARM_TLS_LDO32 \
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|| (R_TYPE) == R_ARM_TLS_LDM32 \
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|| (R_TYPE) == R_ARM_TLS_LDM32_FDPIC \
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|| (R_TYPE) == R_ARM_TLS_DTPOFF32 \
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|| (R_TYPE) == R_ARM_TLS_DTPMOD32 \
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|| (R_TYPE) == R_ARM_TLS_TPOFF32 \
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|| (R_TYPE) == R_ARM_TLS_LE32 \
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|| (R_TYPE) == R_ARM_TLS_IE32 \
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|| (R_TYPE) == R_ARM_TLS_IE32_FDPIC \
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|| IS_ARM_TLS_GNU_RELOC (R_TYPE))
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/* Specific set of relocations for the gnu tls dialect. */
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@ -15077,7 +15125,9 @@ elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info,
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case R_ARM_GOT32:
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case R_ARM_GOT_PREL:
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case R_ARM_TLS_GD32:
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case R_ARM_TLS_GD32_FDPIC:
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case R_ARM_TLS_IE32:
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case R_ARM_TLS_IE32_FDPIC:
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case R_ARM_TLS_GOTDESC:
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case R_ARM_TLS_DESCSEQ:
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case R_ARM_THM_TLS_DESCSEQ:
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@ -15090,8 +15140,10 @@ elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info,
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switch (r_type)
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{
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case R_ARM_TLS_GD32: tls_type = GOT_TLS_GD; break;
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case R_ARM_TLS_GD32_FDPIC: tls_type = GOT_TLS_GD; break;
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case R_ARM_TLS_IE32: tls_type = GOT_TLS_IE; break;
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case R_ARM_TLS_IE32_FDPIC: tls_type = GOT_TLS_IE; break;
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case R_ARM_TLS_GOTDESC:
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case R_ARM_TLS_CALL: case R_ARM_THM_TLS_CALL:
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@ -15149,7 +15201,8 @@ elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info,
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/* Fall through. */
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case R_ARM_TLS_LDM32:
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if (r_type == R_ARM_TLS_LDM32)
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case R_ARM_TLS_LDM32_FDPIC:
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if (r_type == R_ARM_TLS_LDM32 || r_type == R_ARM_TLS_LDM32_FDPIC)
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htab->tls_ldm_got.refcount++;
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/* Fall through. */
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@ -16078,15 +16131,17 @@ allocate_dynrelocs_for_symbol (struct elf_link_hash_entry *h, void * inf)
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if (tls_type & GOT_TLS_GD)
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{
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/* R_ARM_TLS_GD32 needs 2 consecutive GOT slots. If
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the symbol is both GD and GDESC, got.offset may
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have been overwritten. */
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/* R_ARM_TLS_GD32 and R_ARM_TLS_GD32_FDPIC need two
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consecutive GOT slots. If the symbol is both GD
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and GDESC, got.offset may have been
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overwritten. */
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h->got.offset = s->size;
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s->size += 8;
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}
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if (tls_type & GOT_TLS_IE)
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/* R_ARM_TLS_IE32 needs one GOT slot. */
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/* R_ARM_TLS_IE32/R_ARM_TLS_IE32_FDPIC need one GOT
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slot. */
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s->size += 4;
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}
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@ -16689,7 +16744,7 @@ elf32_arm_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED,
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if (htab->tls_ldm_got.refcount > 0)
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{
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/* Allocate two GOT entries and one dynamic relocation (if necessary)
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for R_ARM_TLS_LDM32 relocations. */
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for R_ARM_TLS_LDM32/R_ARM_TLS_LDM32_FDPIC relocations. */
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htab->tls_ldm_got.offset = htab->root.sgot->size;
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htab->root.sgot->size += 8;
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if (bfd_link_pic (info))
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@ -3215,6 +3215,12 @@ ENUMX
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BFD_RELOC_ARM_FUNCDESC
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ENUMX
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BFD_RELOC_ARM_FUNCDESC_VALUE
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ENUMX
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BFD_RELOC_ARM_TLS_GD32_FDPIC
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ENUMX
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BFD_RELOC_ARM_TLS_LDM32_FDPIC
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ENUMX
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BFD_RELOC_ARM_TLS_IE32_FDPIC
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ENUMDOC
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ARM FDPIC specific relocations.
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@ -1,3 +1,12 @@
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2018-04-25 Christophe Lyon <christophe.lyon@st.com>
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Mickaël Guêné <mickael.guene@st.com>
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* config/tc-arm.c (reloc_names): Add TLSGD_FDPIC, TLSLDM_FDPIC,
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GOTTPOFF_FDIC relocations.
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(md_apply_fix): Handle the new TLS FDPIC relocations.
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(tc_gen_reloc): Likewise.
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(arm_fix_adjustable): Likewise.
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2018-04-25 Christophe Lyon <christophe.lyon@st.com>
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Mickaël Guêné <mickael.guene@st.com>
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@ -19309,7 +19309,10 @@ static struct reloc_entry reloc_names[] =
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{ "gotofffuncdesc", BFD_RELOC_ARM_GOTOFFFUNCDESC },
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{ "GOTOFFFUNCDESC", BFD_RELOC_ARM_GOTOFFFUNCDESC },
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{ "funcdesc", BFD_RELOC_ARM_FUNCDESC },
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{ "FUNCDESC", BFD_RELOC_ARM_FUNCDESC }
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{ "FUNCDESC", BFD_RELOC_ARM_FUNCDESC },
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{ "tlsgd_fdpic", BFD_RELOC_ARM_TLS_GD32_FDPIC }, { "TLSGD_FDPIC", BFD_RELOC_ARM_TLS_GD32_FDPIC },
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{ "tlsldm_fdpic", BFD_RELOC_ARM_TLS_LDM32_FDPIC }, { "TLSLDM_FDPIC", BFD_RELOC_ARM_TLS_LDM32_FDPIC },
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{ "gottpoff_fdpic", BFD_RELOC_ARM_TLS_IE32_FDPIC }, { "GOTTPOFF_FDIC", BFD_RELOC_ARM_TLS_IE32_FDPIC },
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};
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#endif
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@ -23982,6 +23985,21 @@ md_apply_fix (fixS * fixP,
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S_SET_THREAD_LOCAL (fixP->fx_addsy);
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break;
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/* Same handling as above, but with the arm_fdpic guard. */
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case BFD_RELOC_ARM_TLS_GD32_FDPIC:
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case BFD_RELOC_ARM_TLS_IE32_FDPIC:
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case BFD_RELOC_ARM_TLS_LDM32_FDPIC:
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if (arm_fdpic)
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{
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S_SET_THREAD_LOCAL (fixP->fx_addsy);
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}
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else
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{
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as_bad_where (fixP->fx_file, fixP->fx_line,
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_("Relocation supported only in FDPIC mode"));
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}
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break;
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case BFD_RELOC_ARM_GOT32:
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case BFD_RELOC_ARM_GOTOFF:
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break;
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@ -24783,9 +24801,12 @@ tc_gen_reloc (asection *section, fixS *fixp)
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case BFD_RELOC_ARM_TLS_GOTDESC:
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case BFD_RELOC_ARM_TLS_GD32:
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case BFD_RELOC_ARM_TLS_GD32_FDPIC:
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case BFD_RELOC_ARM_TLS_LE32:
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case BFD_RELOC_ARM_TLS_IE32:
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case BFD_RELOC_ARM_TLS_IE32_FDPIC:
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case BFD_RELOC_ARM_TLS_LDM32:
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case BFD_RELOC_ARM_TLS_LDM32_FDPIC:
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/* BFD will include the symbol's address in the addend.
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But we don't want that, so subtract it out again here. */
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if (!S_IS_COMMON (fixp->fx_addsy))
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@ -25051,9 +25072,12 @@ arm_fix_adjustable (fixS * fixP)
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|| fixP->fx_r_type == BFD_RELOC_ARM_GOT32
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|| fixP->fx_r_type == BFD_RELOC_ARM_GOTOFF
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|| fixP->fx_r_type == BFD_RELOC_ARM_TLS_GD32
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|| fixP->fx_r_type == BFD_RELOC_ARM_TLS_GD32_FDPIC
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|| fixP->fx_r_type == BFD_RELOC_ARM_TLS_LE32
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|| fixP->fx_r_type == BFD_RELOC_ARM_TLS_IE32
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|| fixP->fx_r_type == BFD_RELOC_ARM_TLS_IE32_FDPIC
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|| fixP->fx_r_type == BFD_RELOC_ARM_TLS_LDM32
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|| fixP->fx_r_type == BFD_RELOC_ARM_TLS_LDM32_FDPIC
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|| fixP->fx_r_type == BFD_RELOC_ARM_TLS_LDO32
|
||||
|| fixP->fx_r_type == BFD_RELOC_ARM_TLS_GOTDESC
|
||||
|| fixP->fx_r_type == BFD_RELOC_ARM_TLS_CALL
|
||||
|
|
|
|||
|
|
@ -1,3 +1,9 @@
|
|||
2018-04-25 Christophe Lyon <christophe.lyon@st.com>
|
||||
Mickaël Guêné <mickael.guene@st.com>
|
||||
|
||||
* elf/arm.h: Add R_ARM_TLS_GD32_FDPIC, R_ARM_TLS_LDM32_FDPIC,
|
||||
R_ARM_TLS_IE32_FDPIC.
|
||||
|
||||
2018-04-25 Christophe Lyon <christophe.lyon@st.com>
|
||||
Mickaël Guêné <mickael.guene@st.com>
|
||||
|
||||
|
|
|
|||
|
|
@ -244,6 +244,9 @@ START_RELOC_NUMBERS (elf_arm_reloc_type)
|
|||
RELOC_NUMBER (R_ARM_GOTOFFFUNCDESC, 162)
|
||||
RELOC_NUMBER (R_ARM_FUNCDESC, 163)
|
||||
RELOC_NUMBER (R_ARM_FUNCDESC_VALUE, 164)
|
||||
RELOC_NUMBER (R_ARM_TLS_GD32_FDPIC, 165)
|
||||
RELOC_NUMBER (R_ARM_TLS_LDM32_FDPIC, 166)
|
||||
RELOC_NUMBER (R_ARM_TLS_IE32_FDPIC, 167)
|
||||
|
||||
/* Extensions? R=read-only? */
|
||||
RELOC_NUMBER (R_ARM_RXPC25, 249)
|
||||
|
|
|
|||
|
|
@ -1,3 +1,8 @@
|
|||
2018-04-25 Christophe Lyon <christophe.lyon@st.com>
|
||||
Mickaël Guêné <mickael.guene@st.com>
|
||||
|
||||
* scripttempl/elf.sc: Define __tdata_start for .tdata section.
|
||||
|
||||
2018-04-25 Christophe Lyon <christophe.lyon@st.com>
|
||||
Mickaël Guêné <mickael.guene@st.com>
|
||||
|
||||
|
|
|
|||
|
|
@ -587,7 +587,11 @@ cat <<EOF
|
|||
.exception_ranges ${RELOCATING-0} : ONLY_IF_RW { *(.exception_ranges .exception_ranges*) }
|
||||
|
||||
/* Thread Local Storage sections */
|
||||
.tdata ${RELOCATING-0} : { *(.tdata${RELOCATING+ .tdata.* .gnu.linkonce.td.*}) }
|
||||
.tdata ${RELOCATING-0} :
|
||||
{
|
||||
${RELOCATING+${CREATE_SHLIB-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__tdata_start = .);}}
|
||||
*(.tdata${RELOCATING+ .tdata.* .gnu.linkonce.td.*})
|
||||
}
|
||||
.tbss ${RELOCATING-0} : { *(.tbss${RELOCATING+ .tbss.* .gnu.linkonce.tb.*})${RELOCATING+ *(.tcommon)} }
|
||||
|
||||
${RELOCATING+${PREINIT_ARRAY}}
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue