| /* X86-64 specific support for 64-bit ELF |
| Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006 |
| Free Software Foundation, Inc. |
| Contributed by Jan Hubicka <jh@suse.cz>. |
| |
| This file is part of BFD, the Binary File Descriptor library. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| |
| #include "bfd.h" |
| #include "sysdep.h" |
| #include "bfdlink.h" |
| #include "libbfd.h" |
| #include "elf-bfd.h" |
| |
| #include "elf/x86-64.h" |
| |
| /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ |
| #define MINUS_ONE (~ (bfd_vma) 0) |
| |
| /* The relocation "howto" table. Order of fields: |
| type, size, bitsize, pc_relative, complain_on_overflow, |
| special_function, name, partial_inplace, src_mask, dst_pack, pcrel_offset. */ |
| static reloc_howto_type x86_64_elf_howto_table[] = |
| { |
| HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, |
| bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000, |
| FALSE), |
| HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE, |
| FALSE), |
| HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, |
| TRUE), |
| HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, |
| FALSE), |
| HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, |
| TRUE), |
| HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff, |
| FALSE), |
| HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE, |
| MINUS_ONE, FALSE), |
| HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE, |
| MINUS_ONE, FALSE), |
| HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE, |
| MINUS_ONE, FALSE), |
| HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, |
| 0xffffffff, TRUE), |
| HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, |
| bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, |
| FALSE), |
| HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff, |
| FALSE), |
| HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE), |
| HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE), |
| HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE), |
| HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE), |
| HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, |
| MINUS_ONE, FALSE), |
| HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, |
| MINUS_ONE, FALSE), |
| HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, |
| MINUS_ONE, FALSE), |
| HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, |
| 0xffffffff, TRUE), |
| HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, |
| 0xffffffff, TRUE), |
| HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, |
| 0xffffffff, FALSE), |
| HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, |
| 0xffffffff, TRUE), |
| HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, |
| 0xffffffff, FALSE), |
| HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE, |
| TRUE), |
| HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| bfd_elf_generic_reloc, "R_X86_64_GOTOFF64", |
| FALSE, MINUS_ONE, MINUS_ONE, FALSE), |
| HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| bfd_elf_generic_reloc, "R_X86_64_GOTPC32", |
| FALSE, 0xffffffff, 0xffffffff, TRUE), |
| EMPTY_HOWTO (27), |
| EMPTY_HOWTO (28), |
| EMPTY_HOWTO (29), |
| EMPTY_HOWTO (30), |
| EMPTY_HOWTO (31), |
| EMPTY_HOWTO (32), |
| EMPTY_HOWTO (33), |
| HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0, |
| complain_overflow_bitfield, bfd_elf_generic_reloc, |
| "R_X86_64_GOTPC32_TLSDESC", |
| FALSE, 0xffffffff, 0xffffffff, TRUE), |
| HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0, |
| complain_overflow_dont, bfd_elf_generic_reloc, |
| "R_X86_64_TLSDESC_CALL", |
| FALSE, 0, 0, FALSE), |
| HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0, |
| complain_overflow_bitfield, bfd_elf_generic_reloc, |
| "R_X86_64_TLSDESC", |
| FALSE, MINUS_ONE, MINUS_ONE, FALSE), |
| |
| /* We have a gap in the reloc numbers here. |
| R_X86_64_standard counts the number up to this point, and |
| R_X86_64_vt_offset is the value to subtract from a reloc type of |
| R_X86_64_GNU_VT* to form an index into this table. */ |
| #define R_X86_64_standard (R_X86_64_TLSDESC + 1) |
| #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard) |
| |
| /* GNU extension to record C++ vtable hierarchy. */ |
| HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE), |
| |
| /* GNU extension to record C++ vtable member usage. */ |
| HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0, |
| FALSE) |
| }; |
| |
| /* Map BFD relocs to the x86_64 elf relocs. */ |
| struct elf_reloc_map |
| { |
| bfd_reloc_code_real_type bfd_reloc_val; |
| unsigned char elf_reloc_val; |
| }; |
| |
| static const struct elf_reloc_map x86_64_reloc_map[] = |
| { |
| { BFD_RELOC_NONE, R_X86_64_NONE, }, |
| { BFD_RELOC_64, R_X86_64_64, }, |
| { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, |
| { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, |
| { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, |
| { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, |
| { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, |
| { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, |
| { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, |
| { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, |
| { BFD_RELOC_32, R_X86_64_32, }, |
| { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, |
| { BFD_RELOC_16, R_X86_64_16, }, |
| { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, |
| { BFD_RELOC_8, R_X86_64_8, }, |
| { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, |
| { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, |
| { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, |
| { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, |
| { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, |
| { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, |
| { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, |
| { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, |
| { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, |
| { BFD_RELOC_64_PCREL, R_X86_64_PC64, }, |
| { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, }, |
| { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, }, |
| { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, }, |
| { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, }, |
| { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, }, |
| { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, |
| { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, |
| }; |
| |
| static reloc_howto_type * |
| elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type) |
| { |
| unsigned i; |
| |
| if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT |
| || r_type >= (unsigned int) R_X86_64_max) |
| { |
| if (r_type >= (unsigned int) R_X86_64_standard) |
| { |
| (*_bfd_error_handler) (_("%B: invalid relocation type %d"), |
| abfd, (int) r_type); |
| r_type = R_X86_64_NONE; |
| } |
| i = r_type; |
| } |
| else |
| i = r_type - (unsigned int) R_X86_64_vt_offset; |
| BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type); |
| return &x86_64_elf_howto_table[i]; |
| } |
| |
| /* Given a BFD reloc type, return a HOWTO structure. */ |
| static reloc_howto_type * |
| elf64_x86_64_reloc_type_lookup (bfd *abfd, |
| bfd_reloc_code_real_type code) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); |
| i++) |
| { |
| if (x86_64_reloc_map[i].bfd_reloc_val == code) |
| return elf64_x86_64_rtype_to_howto (abfd, |
| x86_64_reloc_map[i].elf_reloc_val); |
| } |
| return 0; |
| } |
| |
| /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ |
| |
| static void |
| elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, |
| Elf_Internal_Rela *dst) |
| { |
| unsigned r_type; |
| |
| r_type = ELF64_R_TYPE (dst->r_info); |
| cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type); |
| BFD_ASSERT (r_type == cache_ptr->howto->type); |
| } |
| |
| /* Support for core dump NOTE sections. */ |
| static bfd_boolean |
| elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| { |
| int offset; |
| size_t size; |
| |
| switch (note->descsz) |
| { |
| default: |
| return FALSE; |
| |
| case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ |
| /* pr_cursig */ |
| elf_tdata (abfd)->core_signal |
| = bfd_get_16 (abfd, note->descdata + 12); |
| |
| /* pr_pid */ |
| elf_tdata (abfd)->core_pid |
| = bfd_get_32 (abfd, note->descdata + 32); |
| |
| /* pr_reg */ |
| offset = 112; |
| size = 216; |
| |
| break; |
| } |
| |
| /* Make a ".reg/999" section. */ |
| return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| size, note->descpos + offset); |
| } |
| |
| static bfd_boolean |
| elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| { |
| switch (note->descsz) |
| { |
| default: |
| return FALSE; |
| |
| case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ |
| elf_tdata (abfd)->core_program |
| = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); |
| elf_tdata (abfd)->core_command |
| = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); |
| } |
| |
| /* Note that for some reason, a spurious space is tacked |
| onto the end of the args in some (at least one anyway) |
| implementations, so strip it off if it exists. */ |
| |
| { |
| char *command = elf_tdata (abfd)->core_command; |
| int n = strlen (command); |
| |
| if (0 < n && command[n - 1] == ' ') |
| command[n - 1] = '\0'; |
| } |
| |
| return TRUE; |
| } |
| |
| /* Functions for the x86-64 ELF linker. */ |
| |
| /* The name of the dynamic interpreter. This is put in the .interp |
| section. */ |
| |
| #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1" |
| |
| /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid |
| copying dynamic variables from a shared lib into an app's dynbss |
| section, and instead use a dynamic relocation to point into the |
| shared lib. */ |
| #define ELIMINATE_COPY_RELOCS 1 |
| |
| /* The size in bytes of an entry in the global offset table. */ |
| |
| #define GOT_ENTRY_SIZE 8 |
| |
| /* The size in bytes of an entry in the procedure linkage table. */ |
| |
| #define PLT_ENTRY_SIZE 16 |
| |
| /* The first entry in a procedure linkage table looks like this. See the |
| SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */ |
| |
| static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] = |
| { |
| 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ |
| 0x90, 0x90, 0x90, 0x90 /* pad out to 16 bytes with nops. */ |
| }; |
| |
| /* Subsequent entries in a procedure linkage table look like this. */ |
| |
| static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] = |
| { |
| 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ |
| 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 0x68, /* pushq immediate */ |
| 0, 0, 0, 0, /* replaced with index into relocation table. */ |
| 0xe9, /* jmp relative */ |
| 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ |
| }; |
| |
| /* The x86-64 linker needs to keep track of the number of relocs that |
| it decides to copy as dynamic relocs in check_relocs for each symbol. |
| This is so that it can later discard them if they are found to be |
| unnecessary. We store the information in a field extending the |
| regular ELF linker hash table. */ |
| |
| struct elf64_x86_64_dyn_relocs |
| { |
| /* Next section. */ |
| struct elf64_x86_64_dyn_relocs *next; |
| |
| /* The input section of the reloc. */ |
| asection *sec; |
| |
| /* Total number of relocs copied for the input section. */ |
| bfd_size_type count; |
| |
| /* Number of pc-relative relocs copied for the input section. */ |
| bfd_size_type pc_count; |
| }; |
| |
| /* x86-64 ELF linker hash entry. */ |
| |
| struct elf64_x86_64_link_hash_entry |
| { |
| struct elf_link_hash_entry elf; |
| |
| /* Track dynamic relocs copied for this symbol. */ |
| struct elf64_x86_64_dyn_relocs *dyn_relocs; |
| |
| #define GOT_UNKNOWN 0 |
| #define GOT_NORMAL 1 |
| #define GOT_TLS_GD 2 |
| #define GOT_TLS_IE 3 |
| #define GOT_TLS_GDESC 4 |
| #define GOT_TLS_GD_BOTH_P(type) \ |
| ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) |
| #define GOT_TLS_GD_P(type) \ |
| ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) |
| #define GOT_TLS_GDESC_P(type) \ |
| ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) |
| #define GOT_TLS_GD_ANY_P(type) \ |
| (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) |
| unsigned char tls_type; |
| |
| /* Offset of the GOTPLT entry reserved for the TLS descriptor, |
| starting at the end of the jump table. */ |
| bfd_vma tlsdesc_got; |
| }; |
| |
| #define elf64_x86_64_hash_entry(ent) \ |
| ((struct elf64_x86_64_link_hash_entry *)(ent)) |
| |
| struct elf64_x86_64_obj_tdata |
| { |
| struct elf_obj_tdata root; |
| |
| /* tls_type for each local got entry. */ |
| char *local_got_tls_type; |
| |
| /* GOTPLT entries for TLS descriptors. */ |
| bfd_vma *local_tlsdesc_gotent; |
| }; |
| |
| #define elf64_x86_64_tdata(abfd) \ |
| ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any) |
| |
| #define elf64_x86_64_local_got_tls_type(abfd) \ |
| (elf64_x86_64_tdata (abfd)->local_got_tls_type) |
| |
| #define elf64_x86_64_local_tlsdesc_gotent(abfd) \ |
| (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent) |
| |
| /* x86-64 ELF linker hash table. */ |
| |
| struct elf64_x86_64_link_hash_table |
| { |
| struct elf_link_hash_table elf; |
| |
| /* Short-cuts to get to dynamic linker sections. */ |
| asection *sgot; |
| asection *sgotplt; |
| asection *srelgot; |
| asection *splt; |
| asection *srelplt; |
| asection *sdynbss; |
| asection *srelbss; |
| |
| /* The offset into splt of the PLT entry for the TLS descriptor |
| resolver. Special values are 0, if not necessary (or not found |
| to be necessary yet), and -1 if needed but not determined |
| yet. */ |
| bfd_vma tlsdesc_plt; |
| /* The offset into sgot of the GOT entry used by the PLT entry |
| above. */ |
| bfd_vma tlsdesc_got; |
| |
| union { |
| bfd_signed_vma refcount; |
| bfd_vma offset; |
| } tls_ld_got; |
| |
| /* The amount of space used by the jump slots in the GOT. */ |
| bfd_vma sgotplt_jump_table_size; |
| |
| /* Small local sym to section mapping cache. */ |
| struct sym_sec_cache sym_sec; |
| }; |
| |
| /* Get the x86-64 ELF linker hash table from a link_info structure. */ |
| |
| #define elf64_x86_64_hash_table(p) \ |
| ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) |
| |
| #define elf64_x86_64_compute_jump_table_size(htab) \ |
| ((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE) |
| |
| /* Create an entry in an x86-64 ELF linker hash table. */ |
| |
| static struct bfd_hash_entry * |
| link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, |
| const char *string) |
| { |
| /* Allocate the structure if it has not already been allocated by a |
| subclass. */ |
| if (entry == NULL) |
| { |
| entry = bfd_hash_allocate (table, |
| sizeof (struct elf64_x86_64_link_hash_entry)); |
| if (entry == NULL) |
| return entry; |
| } |
| |
| /* Call the allocation method of the superclass. */ |
| entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| if (entry != NULL) |
| { |
| struct elf64_x86_64_link_hash_entry *eh; |
| |
| eh = (struct elf64_x86_64_link_hash_entry *) entry; |
| eh->dyn_relocs = NULL; |
| eh->tls_type = GOT_UNKNOWN; |
| eh->tlsdesc_got = (bfd_vma) -1; |
| } |
| |
| return entry; |
| } |
| |
| /* Create an X86-64 ELF linker hash table. */ |
| |
| static struct bfd_link_hash_table * |
| elf64_x86_64_link_hash_table_create (bfd *abfd) |
| { |
| struct elf64_x86_64_link_hash_table *ret; |
| bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table); |
| |
| ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt); |
| if (ret == NULL) |
| return NULL; |
| |
| if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, |
| sizeof (struct elf64_x86_64_link_hash_entry))) |
| { |
| free (ret); |
| return NULL; |
| } |
| |
| ret->sgot = NULL; |
| ret->sgotplt = NULL; |
| ret->srelgot = NULL; |
| ret->splt = NULL; |
| ret->srelplt = NULL; |
| ret->sdynbss = NULL; |
| ret->srelbss = NULL; |
| ret->sym_sec.abfd = NULL; |
| ret->tlsdesc_plt = 0; |
| ret->tlsdesc_got = 0; |
| ret->tls_ld_got.refcount = 0; |
| ret->sgotplt_jump_table_size = 0; |
| |
| return &ret->elf.root; |
| } |
| |
| /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up |
| shortcuts to them in our hash table. */ |
| |
| static bfd_boolean |
| create_got_section (bfd *dynobj, struct bfd_link_info *info) |
| { |
| struct elf64_x86_64_link_hash_table *htab; |
| |
| if (! _bfd_elf_create_got_section (dynobj, info)) |
| return FALSE; |
| |
| htab = elf64_x86_64_hash_table (info); |
| htab->sgot = bfd_get_section_by_name (dynobj, ".got"); |
| htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); |
| if (!htab->sgot || !htab->sgotplt) |
| abort (); |
| |
| htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", |
| (SEC_ALLOC | SEC_LOAD |
| | SEC_HAS_CONTENTS |
| | SEC_IN_MEMORY |
| | SEC_LINKER_CREATED |
| | SEC_READONLY)); |
| if (htab->srelgot == NULL |
| || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) |
| return FALSE; |
| return TRUE; |
| } |
| |
| /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and |
| .rela.bss sections in DYNOBJ, and set up shortcuts to them in our |
| hash table. */ |
| |
| static bfd_boolean |
| elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) |
| { |
| struct elf64_x86_64_link_hash_table *htab; |
| |
| htab = elf64_x86_64_hash_table (info); |
| if (!htab->sgot && !create_got_section (dynobj, info)) |
| return FALSE; |
| |
| if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| return FALSE; |
| |
| htab->splt = bfd_get_section_by_name (dynobj, ".plt"); |
| htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| if (!info->shared) |
| htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); |
| |
| if (!htab->splt || !htab->srelplt || !htab->sdynbss |
| || (!info->shared && !htab->srelbss)) |
| abort (); |
| |
| return TRUE; |
| } |
| |
| /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| |
| static void |
| elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info, |
| struct elf_link_hash_entry *dir, |
| struct elf_link_hash_entry *ind) |
| { |
| struct elf64_x86_64_link_hash_entry *edir, *eind; |
| |
| edir = (struct elf64_x86_64_link_hash_entry *) dir; |
| eind = (struct elf64_x86_64_link_hash_entry *) ind; |
| |
| if (eind->dyn_relocs != NULL) |
| { |
| if (edir->dyn_relocs != NULL) |
| { |
| struct elf64_x86_64_dyn_relocs **pp; |
| struct elf64_x86_64_dyn_relocs *p; |
| |
| /* Add reloc counts against the indirect sym to the direct sym |
| list. Merge any entries against the same section. */ |
| for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| { |
| struct elf64_x86_64_dyn_relocs *q; |
| |
| for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| if (q->sec == p->sec) |
| { |
| q->pc_count += p->pc_count; |
| q->count += p->count; |
| *pp = p->next; |
| break; |
| } |
| if (q == NULL) |
| pp = &p->next; |
| } |
| *pp = edir->dyn_relocs; |
| } |
| |
| edir->dyn_relocs = eind->dyn_relocs; |
| eind->dyn_relocs = NULL; |
| } |
| |
| if (ind->root.type == bfd_link_hash_indirect |
| && dir->got.refcount <= 0) |
| { |
| edir->tls_type = eind->tls_type; |
| eind->tls_type = GOT_UNKNOWN; |
| } |
| |
| if (ELIMINATE_COPY_RELOCS |
| && ind->root.type != bfd_link_hash_indirect |
| && dir->dynamic_adjusted) |
| { |
| /* If called to transfer flags for a weakdef during processing |
| of elf_adjust_dynamic_symbol, don't copy non_got_ref. |
| We clear it ourselves for ELIMINATE_COPY_RELOCS. */ |
| dir->ref_dynamic |= ind->ref_dynamic; |
| dir->ref_regular |= ind->ref_regular; |
| dir->ref_regular_nonweak |= ind->ref_regular_nonweak; |
| dir->needs_plt |= ind->needs_plt; |
| dir->pointer_equality_needed |= ind->pointer_equality_needed; |
| } |
| else |
| _bfd_elf_link_hash_copy_indirect (info, dir, ind); |
| } |
| |
| static bfd_boolean |
| elf64_x86_64_mkobject (bfd *abfd) |
| { |
| bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata); |
| abfd->tdata.any = bfd_zalloc (abfd, amt); |
| if (abfd->tdata.any == NULL) |
| return FALSE; |
| return TRUE; |
| } |
| |
| static bfd_boolean |
| elf64_x86_64_elf_object_p (bfd *abfd) |
| { |
| /* Set the right machine number for an x86-64 elf64 file. */ |
| bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); |
| return TRUE; |
| } |
| |
| static int |
| elf64_x86_64_tls_transition (struct bfd_link_info *info, int r_type, int is_local) |
| { |
| if (info->shared) |
| return r_type; |
| |
| switch (r_type) |
| { |
| case R_X86_64_TLSGD: |
| case R_X86_64_GOTPC32_TLSDESC: |
| case R_X86_64_TLSDESC_CALL: |
| case R_X86_64_GOTTPOFF: |
| if (is_local) |
| return R_X86_64_TPOFF32; |
| return R_X86_64_GOTTPOFF; |
| case R_X86_64_TLSLD: |
| return R_X86_64_TPOFF32; |
| } |
| |
| return r_type; |
| } |
| |
| /* Look through the relocs for a section during the first phase, and |
| calculate needed space in the global offset table, procedure |
| linkage table, and dynamic reloc sections. */ |
| |
| static bfd_boolean |
| elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, |
| const Elf_Internal_Rela *relocs) |
| { |
| struct elf64_x86_64_link_hash_table *htab; |
| Elf_Internal_Shdr *symtab_hdr; |
| struct elf_link_hash_entry **sym_hashes; |
| const Elf_Internal_Rela *rel; |
| const Elf_Internal_Rela *rel_end; |
| asection *sreloc; |
| |
| if (info->relocatable) |
| return TRUE; |
| |
| htab = elf64_x86_64_hash_table (info); |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (abfd); |
| |
| sreloc = NULL; |
| |
| rel_end = relocs + sec->reloc_count; |
| for (rel = relocs; rel < rel_end; rel++) |
| { |
| unsigned int r_type; |
| unsigned long r_symndx; |
| struct elf_link_hash_entry *h; |
| |
| r_symndx = ELF64_R_SYM (rel->r_info); |
| r_type = ELF64_R_TYPE (rel->r_info); |
| |
| if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| { |
| (*_bfd_error_handler) (_("%B: bad symbol index: %d"), |
| abfd, r_symndx); |
| return FALSE; |
| } |
| |
| if (r_symndx < symtab_hdr->sh_info) |
| h = NULL; |
| else |
| { |
| h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| while (h->root.type == bfd_link_hash_indirect |
| || h->root.type == bfd_link_hash_warning) |
| h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| } |
| |
| r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL); |
| switch (r_type) |
| { |
| case R_X86_64_TLSLD: |
| htab->tls_ld_got.refcount += 1; |
| goto create_got; |
| |
| case R_X86_64_TPOFF32: |
| if (info->shared) |
| { |
| (*_bfd_error_handler) |
| (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), |
| abfd, |
| x86_64_elf_howto_table[r_type].name, |
| (h) ? h->root.root.string : "a local symbol"); |
| bfd_set_error (bfd_error_bad_value); |
| return FALSE; |
| } |
| break; |
| |
| case R_X86_64_GOTTPOFF: |
| if (info->shared) |
| info->flags |= DF_STATIC_TLS; |
| /* Fall through */ |
| |
| case R_X86_64_GOT32: |
| case R_X86_64_GOTPCREL: |
| case R_X86_64_TLSGD: |
| case R_X86_64_GOTPC32_TLSDESC: |
| case R_X86_64_TLSDESC_CALL: |
| /* This symbol requires a global offset table entry. */ |
| { |
| int tls_type, old_tls_type; |
| |
| switch (r_type) |
| { |
| default: tls_type = GOT_NORMAL; break; |
| case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; |
| case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; |
| case R_X86_64_GOTPC32_TLSDESC: |
| case R_X86_64_TLSDESC_CALL: |
| tls_type = GOT_TLS_GDESC; break; |
| } |
| |
| if (h != NULL) |
| { |
| h->got.refcount += 1; |
| old_tls_type = elf64_x86_64_hash_entry (h)->tls_type; |
| } |
| else |
| { |
| bfd_signed_vma *local_got_refcounts; |
| |
| /* This is a global offset table entry for a local symbol. */ |
| local_got_refcounts = elf_local_got_refcounts (abfd); |
| if (local_got_refcounts == NULL) |
| { |
| bfd_size_type size; |
| |
| size = symtab_hdr->sh_info; |
| size *= sizeof (bfd_signed_vma) |
| + sizeof (bfd_vma) + sizeof (char); |
| local_got_refcounts = ((bfd_signed_vma *) |
| bfd_zalloc (abfd, size)); |
| if (local_got_refcounts == NULL) |
| return FALSE; |
| elf_local_got_refcounts (abfd) = local_got_refcounts; |
| elf64_x86_64_local_tlsdesc_gotent (abfd) |
| = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); |
| elf64_x86_64_local_got_tls_type (abfd) |
| = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); |
| } |
| local_got_refcounts[r_symndx] += 1; |
| old_tls_type |
| = elf64_x86_64_local_got_tls_type (abfd) [r_symndx]; |
| } |
| |
| /* If a TLS symbol is accessed using IE at least once, |
| there is no point to use dynamic model for it. */ |
| if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| && (! GOT_TLS_GD_ANY_P (old_tls_type) |
| || tls_type != GOT_TLS_IE)) |
| { |
| if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type)) |
| tls_type = old_tls_type; |
| else if (GOT_TLS_GD_ANY_P (old_tls_type) |
| && GOT_TLS_GD_ANY_P (tls_type)) |
| tls_type |= old_tls_type; |
| else |
| { |
| (*_bfd_error_handler) |
| (_("%B: %s' accessed both as normal and thread local symbol"), |
| abfd, h ? h->root.root.string : "<local>"); |
| return FALSE; |
| } |
| } |
| |
| if (old_tls_type != tls_type) |
| { |
| if (h != NULL) |
| elf64_x86_64_hash_entry (h)->tls_type = tls_type; |
| else |
| elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| } |
| } |
| /* Fall through */ |
| |
| case R_X86_64_GOTOFF64: |
| case R_X86_64_GOTPC32: |
| create_got: |
| if (htab->sgot == NULL) |
| { |
| if (htab->elf.dynobj == NULL) |
| htab->elf.dynobj = abfd; |
| if (!create_got_section (htab->elf.dynobj, info)) |
| return FALSE; |
| } |
| break; |
| |
| case R_X86_64_PLT32: |
| /* This symbol requires a procedure linkage table entry. We |
| actually build the entry in adjust_dynamic_symbol, |
| because this might be a case of linking PIC code which is |
| never referenced by a dynamic object, in which case we |
| don't need to generate a procedure linkage table entry |
| after all. */ |
| |
| /* If this is a local symbol, we resolve it directly without |
| creating a procedure linkage table entry. */ |
| if (h == NULL) |
| continue; |
| |
| h->needs_plt = 1; |
| h->plt.refcount += 1; |
| break; |
| |
| case R_X86_64_8: |
| case R_X86_64_16: |
| case R_X86_64_32: |
| case R_X86_64_32S: |
| /* Let's help debug shared library creation. These relocs |
| cannot be used in shared libs. Don't error out for |
| sections we don't care about, such as debug sections or |
| non-constant sections. */ |
| if (info->shared |
| && (sec->flags & SEC_ALLOC) != 0 |
| && (sec->flags & SEC_READONLY) != 0) |
| { |
| (*_bfd_error_handler) |
| (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), |
| abfd, |
| x86_64_elf_howto_table[r_type].name, |
| (h) ? h->root.root.string : "a local symbol"); |
| bfd_set_error (bfd_error_bad_value); |
| return FALSE; |
| } |
| /* Fall through. */ |
| |
| case R_X86_64_PC8: |
| case R_X86_64_PC16: |
| case R_X86_64_PC32: |
| case R_X86_64_PC64: |
| case R_X86_64_64: |
| if (h != NULL && !info->shared) |
| { |
| /* If this reloc is in a read-only section, we might |
| need a copy reloc. We can't check reliably at this |
| stage whether the section is read-only, as input |
| sections have not yet been mapped to output sections. |
| Tentatively set the flag for now, and correct in |
| adjust_dynamic_symbol. */ |
| h->non_got_ref = 1; |
| |
| /* We may need a .plt entry if the function this reloc |
| refers to is in a shared lib. */ |
| h->plt.refcount += 1; |
| if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64) |
| h->pointer_equality_needed = 1; |
| } |
| |
| /* If we are creating a shared library, and this is a reloc |
| against a global symbol, or a non PC relative reloc |
| against a local symbol, then we need to copy the reloc |
| into the shared library. However, if we are linking with |
| -Bsymbolic, we do not need to copy a reloc against a |
| global symbol which is defined in an object we are |
| including in the link (i.e., DEF_REGULAR is set). At |
| this point we have not seen all the input files, so it is |
| possible that DEF_REGULAR is not set now but will be set |
| later (it is never cleared). In case of a weak definition, |
| DEF_REGULAR may be cleared later by a strong definition in |
| a shared library. We account for that possibility below by |
| storing information in the relocs_copied field of the hash |
| table entry. A similar situation occurs when creating |
| shared libraries and symbol visibility changes render the |
| symbol local. |
| |
| If on the other hand, we are creating an executable, we |
| may need to keep relocations for symbols satisfied by a |
| dynamic library if we manage to avoid copy relocs for the |
| symbol. */ |
| if ((info->shared |
| && (sec->flags & SEC_ALLOC) != 0 |
| && (((r_type != R_X86_64_PC8) |
| && (r_type != R_X86_64_PC16) |
| && (r_type != R_X86_64_PC32) |
| && (r_type != R_X86_64_PC64)) |
| || (h != NULL |
| && (! info->symbolic |
| || h->root.type == bfd_link_hash_defweak |
| || !h->def_regular)))) |
| || (ELIMINATE_COPY_RELOCS |
| && !info->shared |
| && (sec->flags & SEC_ALLOC) != 0 |
| && h != NULL |
| && (h->root.type == bfd_link_hash_defweak |
| || !h->def_regular))) |
| { |
| struct elf64_x86_64_dyn_relocs *p; |
| struct elf64_x86_64_dyn_relocs **head; |
| |
| /* We must copy these reloc types into the output file. |
| Create a reloc section in dynobj and make room for |
| this reloc. */ |
| if (sreloc == NULL) |
| { |
| const char *name; |
| bfd *dynobj; |
| |
| name = (bfd_elf_string_from_elf_section |
| (abfd, |
| elf_elfheader (abfd)->e_shstrndx, |
| elf_section_data (sec)->rel_hdr.sh_name)); |
| if (name == NULL) |
| return FALSE; |
| |
| if (strncmp (name, ".rela", 5) != 0 |
| || strcmp (bfd_get_section_name (abfd, sec), |
| name + 5) != 0) |
| { |
| (*_bfd_error_handler) |
| (_("%B: bad relocation section name `%s\'"), |
| abfd, name); |
| } |
| |
| if (htab->elf.dynobj == NULL) |
| htab->elf.dynobj = abfd; |
| |
| dynobj = htab->elf.dynobj; |
| |
| sreloc = bfd_get_section_by_name (dynobj, name); |
| if (sreloc == NULL) |
| { |
| flagword flags; |
| |
| flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| if ((sec->flags & SEC_ALLOC) != 0) |
| flags |= SEC_ALLOC | SEC_LOAD; |
| sreloc = bfd_make_section_with_flags (dynobj, |
| name, |
| flags); |
| if (sreloc == NULL |
| || ! bfd_set_section_alignment (dynobj, sreloc, 3)) |
| return FALSE; |
| } |
| elf_section_data (sec)->sreloc = sreloc; |
| } |
| |
| /* If this is a global symbol, we count the number of |
| relocations we need for this symbol. */ |
| if (h != NULL) |
| { |
| head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs; |
| } |
| else |
| { |
| void **vpp; |
| /* Track dynamic relocs needed for local syms too. |
| We really need local syms available to do this |
| easily. Oh well. */ |
| |
| asection *s; |
| s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, |
| sec, r_symndx); |
| if (s == NULL) |
| return FALSE; |
| |
| /* Beware of type punned pointers vs strict aliasing |
| rules. */ |
| vpp = &(elf_section_data (s)->local_dynrel); |
| head = (struct elf64_x86_64_dyn_relocs **)vpp; |
| } |
| |
| p = *head; |
| if (p == NULL || p->sec != sec) |
| { |
| bfd_size_type amt = sizeof *p; |
| p = ((struct elf64_x86_64_dyn_relocs *) |
| bfd_alloc (htab->elf.dynobj, amt)); |
| if (p == NULL) |
| return FALSE; |
| p->next = *head; |
| *head = p; |
| p->sec = sec; |
| p->count = 0; |
| p->pc_count = 0; |
| } |
| |
| p->count += 1; |
| if (r_type == R_X86_64_PC8 |
| || r_type == R_X86_64_PC16 |
| || r_type == R_X86_64_PC32 |
| || r_type == R_X86_64_PC64) |
| p->pc_count += 1; |
| } |
| break; |
| |
| /* This relocation describes the C++ object vtable hierarchy. |
| Reconstruct it for later use during GC. */ |
| case R_X86_64_GNU_VTINHERIT: |
| if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| return FALSE; |
| break; |
| |
| /* This relocation describes which C++ vtable entries are actually |
| used. Record for later use during GC. */ |
| case R_X86_64_GNU_VTENTRY: |
| if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| return FALSE; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| /* Return the section that should be marked against GC for a given |
| relocation. */ |
| |
| static asection * |
| elf64_x86_64_gc_mark_hook (asection *sec, |
| struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| Elf_Internal_Rela *rel, |
| struct elf_link_hash_entry *h, |
| Elf_Internal_Sym *sym) |
| { |
| if (h != NULL) |
| { |
| switch (ELF64_R_TYPE (rel->r_info)) |
| { |
| case R_X86_64_GNU_VTINHERIT: |
| case R_X86_64_GNU_VTENTRY: |
| break; |
| |
| default: |
| switch (h->root.type) |
| { |
| case bfd_link_hash_defined: |
| case bfd_link_hash_defweak: |
| return h->root.u.def.section; |
| |
| case bfd_link_hash_common: |
| return h->root.u.c.p->section; |
| |
| default: |
| break; |
| } |
| } |
| } |
| else |
| return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
| |
| return NULL; |
| } |
| |
| /* Update the got entry reference counts for the section being removed. */ |
| |
| static bfd_boolean |
| elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, |
| asection *sec, const Elf_Internal_Rela *relocs) |
| { |
| Elf_Internal_Shdr *symtab_hdr; |
| struct elf_link_hash_entry **sym_hashes; |
| bfd_signed_vma *local_got_refcounts; |
| const Elf_Internal_Rela *rel, *relend; |
| |
| elf_section_data (sec)->local_dynrel = NULL; |
| |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (abfd); |
| local_got_refcounts = elf_local_got_refcounts (abfd); |
| |
| relend = relocs + sec->reloc_count; |
| for (rel = relocs; rel < relend; rel++) |
| { |
| unsigned long r_symndx; |
| unsigned int r_type; |
| struct elf_link_hash_entry *h = NULL; |
| |
| r_symndx = ELF64_R_SYM (rel->r_info); |
| if (r_symndx >= symtab_hdr->sh_info) |
| { |
| struct elf64_x86_64_link_hash_entry *eh; |
| struct elf64_x86_64_dyn_relocs **pp; |
| struct elf64_x86_64_dyn_relocs *p; |
| |
| h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| while (h->root.type == bfd_link_hash_indirect |
| || h->root.type == bfd_link_hash_warning) |
| h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| eh = (struct elf64_x86_64_link_hash_entry *) h; |
| |
| for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| if (p->sec == sec) |
| { |
| /* Everything must go for SEC. */ |
| *pp = p->next; |
| break; |
| } |
| } |
| |
| r_type = ELF64_R_TYPE (rel->r_info); |
| r_type = elf64_x86_64_tls_transition (info, r_type, h != NULL); |
| switch (r_type) |
| { |
| case R_X86_64_TLSLD: |
| if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0) |
| elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1; |
| break; |
| |
| case R_X86_64_TLSGD: |
| case R_X86_64_GOTPC32_TLSDESC: |
| case R_X86_64_TLSDESC_CALL: |
| case R_X86_64_GOTTPOFF: |
| case R_X86_64_GOT32: |
| case R_X86_64_GOTPCREL: |
| if (h != NULL) |
| { |
| if (h->got.refcount > 0) |
| h->got.refcount -= 1; |
| } |
| else if (local_got_refcounts != NULL) |
| { |
| if (local_got_refcounts[r_symndx] > 0) |
| local_got_refcounts[r_symndx] -= 1; |
| } |
| break; |
| |
| case R_X86_64_8: |
| case R_X86_64_16: |
| case R_X86_64_32: |
| case R_X86_64_64: |
| case R_X86_64_32S: |
| case R_X86_64_PC8: |
| case R_X86_64_PC16: |
| case R_X86_64_PC32: |
| case R_X86_64_PC64: |
| if (info->shared) |
| break; |
| /* Fall thru */ |
| |
| case R_X86_64_PLT32: |
| if (h != NULL) |
| { |
| if (h->plt.refcount > 0) |
| h->plt.refcount -= 1; |
| } |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| /* Adjust a symbol defined by a dynamic object and referenced by a |
| regular object. The current definition is in some section of the |
| dynamic object, but we're not including those sections. We have to |
| change the definition to something the rest of the link can |
| understand. */ |
| |
| static bfd_boolean |
| elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info, |
| struct elf_link_hash_entry *h) |
| { |
| struct elf64_x86_64_link_hash_table *htab; |
| asection *s; |
| unsigned int power_of_two; |
| |
| /* If this is a function, put it in the procedure linkage table. We |
| will fill in the contents of the procedure linkage table later, |
| when we know the address of the .got section. */ |
| if (h->type == STT_FUNC |
| || h->needs_plt) |
| { |
| if (h->plt.refcount <= 0 |
| || SYMBOL_CALLS_LOCAL (info, h) |
| || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| && h->root.type == bfd_link_hash_undefweak)) |
| { |
| /* This case can occur if we saw a PLT32 reloc in an input |
| file, but the symbol was never referred to by a dynamic |
| object, or if all references were garbage collected. In |
| such a case, we don't actually need to build a procedure |
| linkage table, and we can just do a PC32 reloc instead. */ |
| h->plt.offset = (bfd_vma) -1; |
| h->needs_plt = 0; |
| } |
| |
| return TRUE; |
| } |
| else |
| /* It's possible that we incorrectly decided a .plt reloc was |
| needed for an R_X86_64_PC32 reloc to a non-function sym in |
| check_relocs. We can't decide accurately between function and |
| non-function syms in check-relocs; Objects loaded later in |
| the link may change h->type. So fix it now. */ |
| h->plt.offset = (bfd_vma) -1; |
| |
| /* If this is a weak symbol, and there is a real definition, the |
| processor independent code will have arranged for us to see the |
| real definition first, and we can just use the same value. */ |
| if (h->u.weakdef != NULL) |
| { |
| BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined |
| || h->u.weakdef->root.type == bfd_link_hash_defweak); |
| h->root.u.def.section = h->u.weakdef->root.u.def.section; |
| h->root.u.def.value = h->u.weakdef->root.u.def.value; |
| if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) |
| h->non_got_ref = h->u.weakdef->non_got_ref; |
| return TRUE; |
| } |
| |
| /* This is a reference to a symbol defined by a dynamic object which |
| is not a function. */ |
| |
| /* If we are creating a shared library, we must presume that the |
| only references to the symbol are via the global offset table. |
| For such cases we need not do anything here; the relocations will |
| be handled correctly by relocate_section. */ |
| if (info->shared) |
| return TRUE; |
| |
| /* If there are no references to this symbol that do not use the |
| GOT, we don't need to generate a copy reloc. */ |
| if (!h->non_got_ref) |
| return TRUE; |
| |
| /* If -z nocopyreloc was given, we won't generate them either. */ |
| if (info->nocopyreloc) |
| { |
| h->non_got_ref = 0; |
| return TRUE; |
| } |
| |
| if (ELIMINATE_COPY_RELOCS) |
| { |
| struct elf64_x86_64_link_hash_entry * eh; |
| struct elf64_x86_64_dyn_relocs *p; |
| |
| eh = (struct elf64_x86_64_link_hash_entry *) h; |
| for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| { |
| s = p->sec->output_section; |
| if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| break; |
| } |
| |
| /* If we didn't find any dynamic relocs in read-only sections, then |
| we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
| if (p == NULL) |
| { |
| h->non_got_ref = 0; |
| return TRUE; |
| } |
| } |
| |
| if (h->size == 0) |
| { |
| (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), |
| h->root.root.string); |
| return TRUE; |
| } |
| |
| /* We must allocate the symbol in our .dynbss section, which will |
| become part of the .bss section of the executable. There will be |
| an entry for this symbol in the .dynsym section. The dynamic |
| object will contain position independent code, so all references |
| from the dynamic object to this symbol will go through the global |
| offset table. The dynamic linker will use the .dynsym entry to |
| determine the address it must put in the global offset table, so |
| both the dynamic object and the regular object will refer to the |
| same memory location for the variable. */ |
| |
| htab = elf64_x86_64_hash_table (info); |
| |
| /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker |
| to copy the initial value out of the dynamic object and into the |
| runtime process image. */ |
| if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| { |
| htab->srelbss->size += sizeof (Elf64_External_Rela); |
| h->needs_copy = 1; |
| } |
| |
| /* We need to figure out the alignment required for this symbol. I |
| have no idea how ELF linkers handle this. 16-bytes is the size |
| of the largest type that requires hard alignment -- long double. */ |
| /* FIXME: This is VERY ugly. Should be fixed for all architectures using |
| this construct. */ |
| power_of_two = bfd_log2 (h->size); |
| if (power_of_two > 4) |
| power_of_two = 4; |
| |
| /* Apply the required alignment. */ |
| s = htab->sdynbss; |
| s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); |
| if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) |
| { |
| if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) |
| return FALSE; |
| } |
| |
| /* Define the symbol as being at this point in the section. */ |
| h->root.u.def.section = s; |
| h->root.u.def.value = s->size; |
| |
| /* Increment the section size to make room for the symbol. */ |
| s->size += h->size; |
| |
| return TRUE; |
| } |
| |
| /* Allocate space in .plt, .got and associated reloc sections for |
| dynamic relocs. */ |
| |
| static bfd_boolean |
| allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) |
| { |
| struct bfd_link_info *info; |
| struct elf64_x86_64_link_hash_table *htab; |
| struct elf64_x86_64_link_hash_entry *eh; |
| struct elf64_x86_64_dyn_relocs *p; |
| |
| if (h->root.type == bfd_link_hash_indirect) |
| return TRUE; |
| |
| if (h->root.type == bfd_link_hash_warning) |
| h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| |
| info = (struct bfd_link_info *) inf; |
| htab = elf64_x86_64_hash_table (info); |
| |
| if (htab->elf.dynamic_sections_created |
| && h->plt.refcount > 0) |
| { |
| /* Make sure this symbol is output as a dynamic symbol. |
| Undefined weak syms won't yet be marked as dynamic. */ |
| if (h->dynindx == -1 |
| && !h->forced_local) |
| { |
| if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| return FALSE; |
| } |
| |
| if (info->shared |
| || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) |
| { |
| asection *s = htab->splt; |
| |
| /* If this is the first .plt entry, make room for the special |
| first entry. */ |
| if (s->size == 0) |
| s->size += PLT_ENTRY_SIZE; |
| |
| h->plt.offset = s->size; |
| |
| /* If this symbol is not defined in a regular file, and we are |
| not generating a shared library, then set the symbol to this |
| location in the .plt. This is required to make function |
| pointers compare as equal between the normal executable and |
| the shared library. */ |
| if (! info->shared |
| && !h->def_regular) |
| { |
| h->root.u.def.section = s; |
| h->root.u.def.value = h->plt.offset; |
| } |
| |
| /* Make room for this entry. */ |
| s->size += PLT_ENTRY_SIZE; |
| |
| /* We also need to make an entry in the .got.plt section, which |
| will be placed in the .got section by the linker script. */ |
| htab->sgotplt->size += GOT_ENTRY_SIZE; |
| |
| /* We also need to make an entry in the .rela.plt section. */ |
| htab->srelplt->size += sizeof (Elf64_External_Rela); |
| htab->srelplt->reloc_count++; |
| } |
| else |
| { |
| h->plt.offset = (bfd_vma) -1; |
| h->needs_plt = 0; |
| } |
| } |
| else |
| { |
| h->plt.offset = (bfd_vma) -1; |
| h->needs_plt = 0; |
| } |
| |
| eh = (struct elf64_x86_64_link_hash_entry *) h; |
| eh->tlsdesc_got = (bfd_vma) -1; |
| |
| /* If R_X86_64_GOTTPOFF symbol is now local to the binary, |
| make it a R_X86_64_TPOFF32 requiring no GOT entry. */ |
| if (h->got.refcount > 0 |
| && !info->shared |
| && h->dynindx == -1 |
| && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE) |
| h->got.offset = (bfd_vma) -1; |
| else if (h->got.refcount > 0) |
| { |
| asection *s; |
| bfd_boolean dyn; |
| int tls_type = elf64_x86_64_hash_entry (h)->tls_type; |
| |
| /* Make sure this symbol is output as a dynamic symbol. |
| Undefined weak syms won't yet be marked as dynamic. */ |
| if (h->dynindx == -1 |
| && !h->forced_local) |
| { |
| if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| return FALSE; |
| } |
| |
| if (GOT_TLS_GDESC_P (tls_type)) |
| { |
| eh->tlsdesc_got = htab->sgotplt->size |
| - elf64_x86_64_compute_jump_table_size (htab); |
| htab->sgotplt->size += 2 * GOT_ENTRY_SIZE; |
| h->got.offset = (bfd_vma) -2; |
| } |
| if (! GOT_TLS_GDESC_P (tls_type) |
| || GOT_TLS_GD_P (tls_type)) |
| { |
| s = htab->sgot; |
| h->got.offset = s->size; |
| s->size += GOT_ENTRY_SIZE; |
| if (GOT_TLS_GD_P (tls_type)) |
| s->size += GOT_ENTRY_SIZE; |
| } |
| dyn = htab->elf.dynamic_sections_created; |
| /* R_X86_64_TLSGD needs one dynamic relocation if local symbol |
| and two if global. |
| R_X86_64_GOTTPOFF needs one dynamic relocation. */ |
| if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) |
| || tls_type == GOT_TLS_IE) |
| htab->srelgot->size += sizeof (Elf64_External_Rela); |
| else if (GOT_TLS_GD_P (tls_type)) |
| htab->srelgot->size += 2 * sizeof (Elf64_External_Rela); |
| else if (! GOT_TLS_GDESC_P (tls_type) |
| && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| || h->root.type != bfd_link_hash_undefweak) |
| && (info->shared |
| || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) |
| htab->srelgot->size += sizeof (Elf64_External_Rela); |
| if (GOT_TLS_GDESC_P (tls_type)) |
| { |
| htab->srelplt->size += sizeof (Elf64_External_Rela); |
| htab->tlsdesc_plt = (bfd_vma) -1; |
| } |
| } |
| else |
| h->got.offset = (bfd_vma) -1; |
| |
| if (eh->dyn_relocs == NULL) |
| return TRUE; |
| |
| /* In the shared -Bsymbolic case, discard space allocated for |
| dynamic pc-relative relocs against symbols which turn out to be |
| defined in regular objects. For the normal shared case, discard |
| space for pc-relative relocs that have become local due to symbol |
| visibility changes. */ |
| |
| if (info->shared) |
| { |
| /* Relocs that use pc_count are those that appear on a call |
| insn, or certain REL relocs that can generated via assembly. |
| We want calls to protected symbols to resolve directly to the |
| function rather than going via the plt. If people want |
| function pointer comparisons to work as expected then they |
| should avoid writing weird assembly. */ |
| if (SYMBOL_CALLS_LOCAL (info, h)) |
| { |
| struct elf64_x86_64_dyn_relocs **pp; |
| |
| for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| { |
| p->count -= p->pc_count; |
| p->pc_count = 0; |
| if (p->count == 0) |
| *pp = p->next; |
| else |
| pp = &p->next; |
| } |
| } |
| |
| /* Also discard relocs on undefined weak syms with non-default |
| visibility. */ |
| if (eh->dyn_relocs != NULL |
| && h->root.type == bfd_link_hash_undefweak) |
| { |
| if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| eh->dyn_relocs = NULL; |
| |
| /* Make sure undefined weak symbols are output as a dynamic |
| symbol in PIEs. */ |
| else if (h->dynindx == -1 |
| && !h->forced_local) |
| { |
| if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| return FALSE; |
| } |
| } |
| } |
| else if (ELIMINATE_COPY_RELOCS) |
| { |
| /* For the non-shared case, discard space for relocs against |
| symbols which turn out to need copy relocs or are not |
| dynamic. */ |
| |
| if (!h->non_got_ref |
| && ((h->def_dynamic |
| && !h->def_regular) |
| || (htab->elf.dynamic_sections_created |
| && (h->root.type == bfd_link_hash_undefweak |
| || h->root.type == bfd_link_hash_undefined)))) |
| { |
| /* Make sure this symbol is output as a dynamic symbol. |
| Undefined weak syms won't yet be marked as dynamic. */ |
| if (h->dynindx == -1 |
| && !h->forced_local) |
| { |
| if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| return FALSE; |
| } |
| |
| /* If that succeeded, we know we'll be keeping all the |
| relocs. */ |
| if (h->dynindx != -1) |
| goto keep; |
| } |
| |
| eh->dyn_relocs = NULL; |
| |
| keep: ; |
| } |
| |
| /* Finally, allocate space. */ |
| for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| { |
| asection *sreloc = elf_section_data (p->sec)->sreloc; |
| sreloc->size += p->count * sizeof (Elf64_External_Rela); |
| } |
| |
| return TRUE; |
| } |
| |
| /* Find any dynamic relocs that apply to read-only sections. */ |
| |
| static bfd_boolean |
| readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf) |
| { |
| struct elf64_x86_64_link_hash_entry *eh; |
| struct elf64_x86_64_dyn_relocs *p; |
| |
| if (h->root.type == bfd_link_hash_warning) |
| h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| |
| eh = (struct elf64_x86_64_link_hash_entry *) h; |
| for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| { |
| asection *s = p->sec->output_section; |
| |
| if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| { |
| struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| |
| info->flags |= DF_TEXTREL; |
| |
| /* Not an error, just cut short the traversal. */ |
| return FALSE; |
| } |
| } |
| return TRUE; |
| } |
| |
| /* Set the sizes of the dynamic sections. */ |
| |
| static bfd_boolean |
| elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, |
| struct bfd_link_info *info) |
| { |
| struct elf64_x86_64_link_hash_table *htab; |
| bfd *dynobj; |
| asection *s; |
| bfd_boolean relocs; |
| bfd *ibfd; |
| |
| htab = elf64_x86_64_hash_table (info); |
| dynobj = htab->elf.dynobj; |
| if (dynobj == NULL) |
| abort (); |
| |
| if (htab->elf.dynamic_sections_created) |
| { |
| /* Set the contents of the .interp section to the interpreter. */ |
| if (info->executable) |
| { |
| s = bfd_get_section_by_name (dynobj, ".interp"); |
| if (s == NULL) |
| abort (); |
| s->size = sizeof ELF_DYNAMIC_INTERPRETER; |
| s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| } |
| } |
| |
| /* Set up .got offsets for local syms, and space for local dynamic |
| relocs. */ |
| for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| { |
| bfd_signed_vma *local_got; |
| bfd_signed_vma *end_local_got; |
| char *local_tls_type; |
| bfd_vma *local_tlsdesc_gotent; |
| bfd_size_type locsymcount; |
| Elf_Internal_Shdr *symtab_hdr; |
| asection *srel; |
| |
| if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| continue; |
| |
| for (s = ibfd->sections; s != NULL; s = s->next) |
| { |
| struct elf64_x86_64_dyn_relocs *p; |
| |
| for (p = (struct elf64_x86_64_dyn_relocs *) |
| (elf_section_data (s)->local_dynrel); |
| p != NULL; |
| p = p->next) |
| { |
| if (!bfd_is_abs_section (p->sec) |
| && bfd_is_abs_section (p->sec->output_section)) |
| { |
| /* Input section has been discarded, either because |
| it is a copy of a linkonce section or due to |
| linker script /DISCARD/, so we'll be discarding |
| the relocs too. */ |
| } |
| else if (p->count != 0) |
| { |
| srel = elf_section_data (p->sec)->sreloc; |
| srel->size += p->count * sizeof (Elf64_External_Rela); |
| if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| info->flags |= DF_TEXTREL; |
| |
| } |
| } |
| } |
| |
| local_got = elf_local_got_refcounts (ibfd); |
| if (!local_got) |
| continue; |
| |
| symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; |
| locsymcount = symtab_hdr->sh_info; |
| end_local_got = local_got + locsymcount; |
| local_tls_type = elf64_x86_64_local_got_tls_type (ibfd); |
| local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd); |
| s = htab->sgot; |
| srel = htab->srelgot; |
| for (; local_got < end_local_got; |
| ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) |
| { |
| *local_tlsdesc_gotent = (bfd_vma) -1; |
| if (*local_got > 0) |
| { |
| if (GOT_TLS_GDESC_P (*local_tls_type)) |
| { |
| *local_tlsdesc_gotent = htab->sgotplt->size |
| - elf64_x86_64_compute_jump_table_size (htab); |
| htab->sgotplt->size += 2 * GOT_ENTRY_SIZE; |
| *local_got = (bfd_vma) -2; |
| } |
| if (! GOT_TLS_GDESC_P (*local_tls_type) |
| || GOT_TLS_GD_P (*local_tls_type)) |
| { |
| *local_got = s->size; |
| s->size += GOT_ENTRY_SIZE; |
| if (GOT_TLS_GD_P (*local_tls_type)) |
| s->size += GOT_ENTRY_SIZE; |
| } |
| if (info->shared |
| || GOT_TLS_GD_ANY_P (*local_tls_type) |
| || *local_tls_type == GOT_TLS_IE) |
| { |
| if (GOT_TLS_GDESC_P (*local_tls_type)) |
| { |
| htab->srelplt->size += sizeof (Elf64_External_Rela); |
| htab->tlsdesc_plt = (bfd_vma) -1; |
| } |
| if (! GOT_TLS_GDESC_P (*local_tls_type) |
| || GOT_TLS_GD_P (*local_tls_type)) |
| srel->size += sizeof (Elf64_External_Rela); |
| } |
| } |
| else |
| *local_got = (bfd_vma) -1; |
| } |
| } |
| |
| if (htab->tls_ld_got.refcount > 0) |
| { |
| /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD |
| relocs. */ |
| htab->tls_ld_got.offset = htab->sgot->size; |
| htab->sgot->size += 2 * GOT_ENTRY_SIZE; |
| htab->srelgot->size += sizeof (Elf64_External_Rela); |
| } |
| else |
| htab->tls_ld_got.offset = -1; |
| |
| /* Allocate global sym .plt and .got entries, and space for global |
| sym dynamic relocs. */ |
| elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); |
| |
| /* For every jump slot reserved in the sgotplt, reloc_count is |
| incremented. However, when we reserve space for TLS descriptors, |
| it's not incremented, so in order to compute the space reserved |
| for them, it suffices to multiply the reloc count by the jump |
| slot size. */ |
| if (htab->srelplt) |
| htab->sgotplt_jump_table_size |
| = elf64_x86_64_compute_jump_table_size (htab); |
| |
| if (htab->tlsdesc_plt) |
| { |
| /* If we're not using lazy TLS relocations, don't generate the |
| PLT and GOT entries they require. */ |
| if ((info->flags & DF_BIND_NOW)) |
| htab->tlsdesc_plt = 0; |
| else |
| { |
| htab->tlsdesc_got = htab->sgot->size; |
| htab->sgot->size += GOT_ENTRY_SIZE; |
| /* Reserve room for the initial entry. |
| FIXME: we could probably do away with it in this case. */ |
| if (htab->splt->size == 0) |
| htab->splt->size += PLT_ENTRY_SIZE; |
| htab->tlsdesc_plt = htab->splt->size; |
| htab->splt->size += PLT_ENTRY_SIZE; |
| } |
| } |
| |
| /* We now have determined the sizes of the various dynamic sections. |
| Allocate memory for them. */ |
| relocs = FALSE; |
| for (s = dynobj->sections; s != NULL; s = s->next) |
| { |
| if ((s->flags & SEC_LINKER_CREATED) == 0) |
| continue; |
| |
| if (s == htab->splt |
| || s == htab->sgot |
| || s == htab->sgotplt |
| || s == htab->sdynbss) |
| { |
| /* Strip this section if we don't need it; see the |
| comment below. */ |
| } |
| else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) |
| { |
| if (s->size != 0 && s != htab->srelplt) |
| relocs = TRUE; |
| |
| /* We use the reloc_count field as a counter if we need |
| to copy relocs into the output file. */ |
| if (s != htab->srelplt) |
| s->reloc_count = 0; |
| } |
| else |
| { |
| /* It's not one of our sections, so don't allocate space. */ |
| continue; |
| } |
| |
| if (s->size == 0) |
| { |
| /* If we don't need this section, strip it from the |
| output file. This is mostly to handle .rela.bss and |
| .rela.plt. We must create both sections in |
| create_dynamic_sections, because they must be created |
| before the linker maps input sections to output |
| sections. The linker does that before |
| adjust_dynamic_symbol is called, and it is that |
| function which decides whether anything needs to go |
| into these sections. */ |
| |
| s->flags |= SEC_EXCLUDE; |
| continue; |
| } |
| |
| if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| continue; |
| |
| /* Allocate memory for the section contents. We use bfd_zalloc |
| here in case unused entries are not reclaimed before the |
| section's contents are written out. This should not happen, |
| but this way if it does, we get a R_X86_64_NONE reloc instead |
| of garbage. */ |
| s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); |
| if (s->contents == NULL) |
| return FALSE; |
| } |
| |
| if (htab->elf.dynamic_sections_created) |
| { |
| /* Add some entries to the .dynamic section. We fill in the |
| values later, in elf64_x86_64_finish_dynamic_sections, but we |
| must add the entries now so that we get the correct size for |
| the .dynamic section. The DT_DEBUG entry is filled in by the |
| dynamic linker and used by the debugger. */ |
| #define add_dynamic_entry(TAG, VAL) \ |
| _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| |
| if (info->executable) |
| { |
| if (!add_dynamic_entry (DT_DEBUG, 0)) |
| return FALSE; |
| } |
| |
| if (htab->splt->size != 0) |
| { |
| if (!add_dynamic_entry (DT_PLTGOT, 0) |
| || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| || !add_dynamic_entry (DT_JMPREL, 0)) |
| return FALSE; |
| |
| if (htab->tlsdesc_plt |
| && (!add_dynamic_entry (DT_TLSDESC_PLT, 0) |
| || !add_dynamic_entry (DT_TLSDESC_GOT, 0))) |
| return FALSE; |
| } |
| |
| if (relocs) |
| { |
| if (!add_dynamic_entry (DT_RELA, 0) |
| || !add_dynamic_entry (DT_RELASZ, 0) |
| || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) |
| return FALSE; |
| |
| /* If any dynamic relocs apply to a read-only section, |
| then we need a DT_TEXTREL entry. */ |
| if ((info->flags & DF_TEXTREL) == 0) |
| elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, |
| (PTR) info); |
| |
| if ((info->flags & DF_TEXTREL) != 0) |
| { |
| if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| return FALSE; |
| } |
| } |
| } |
| #undef add_dynamic_entry |
| |
| return TRUE; |
| } |
| |
| static bfd_boolean |
| elf64_x86_64_always_size_sections (bfd *output_bfd, |
| struct bfd_link_info *info) |
| { |
| asection *tls_sec = elf_hash_table (info)->tls_sec; |
| |
| if (tls_sec) |
| { |
| struct elf_link_hash_entry *tlsbase; |
| |
| tlsbase = elf_link_hash_lookup (elf_hash_table (info), |
| "_TLS_MODULE_BASE_", |
| FALSE, FALSE, FALSE); |
| |
| if (tlsbase && tlsbase->type == STT_TLS) |
| { |
| struct bfd_link_hash_entry *bh = NULL; |
| const struct elf_backend_data *bed |
| = get_elf_backend_data (output_bfd); |
| |
| if (!(_bfd_generic_link_add_one_symbol |
| (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, |
| tls_sec, 0, NULL, FALSE, |
| bed->collect, &bh))) |
| return FALSE; |
| tlsbase = (struct elf_link_hash_entry *)bh; |
| tlsbase->def_regular = 1; |
| tlsbase->other = STV_HIDDEN; |
| (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| /* Return the base VMA address which should be subtracted from real addresses |
| when resolving @dtpoff relocation. |
| This is PT_TLS segment p_vaddr. */ |
| |
| static bfd_vma |
| dtpoff_base (struct bfd_link_info *info) |
| { |
| /* If tls_sec is NULL, we should have signalled an error already. */ |
| if (elf_hash_table (info)->tls_sec == NULL) |
| return 0; |
| return elf_hash_table (info)->tls_sec->vma; |
| } |
| |
| /* Return the relocation value for @tpoff relocation |
| if STT_TLS virtual address is ADDRESS. */ |
| |
| static bfd_vma |
| tpoff (struct bfd_link_info *info, bfd_vma address) |
| { |
| struct elf_link_hash_table *htab = elf_hash_table (info); |
| |
| /* If tls_segment is NULL, we should have signalled an error already. */ |
| if (htab->tls_sec == NULL) |
| return 0; |
| return address - htab->tls_size - htab->tls_sec->vma; |
| } |
| |
| /* Is the instruction before OFFSET in CONTENTS a 32bit relative |
| branch? */ |
| |
| static bfd_boolean |
| is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset) |
| { |
| /* Opcode Instruction |
| 0xe8 call |
| 0xe9 jump |
| 0x0f 0x8x conditional jump */ |
| return ((offset > 0 |
| && (contents [offset - 1] == 0xe8 |
| || contents [offset - 1] == 0xe9)) |
| || (offset > 1 |
| && contents [offset - 2] == 0x0f |
| && (contents [offset - 1] & 0xf0) == 0x80)); |
| } |
| |
| /* Relocate an x86_64 ELF section. */ |
| |
| static bfd_boolean |
| elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info, |
| bfd *input_bfd, asection *input_section, |
| bfd_byte *contents, Elf_Internal_Rela *relocs, |
| Elf_Internal_Sym *local_syms, |
| asection **local_sections) |
| { |
| struct elf64_x86_64_link_hash_table *htab; |
| Elf_Internal_Shdr *symtab_hdr; |
| struct elf_link_hash_entry **sym_hashes; |
| bfd_vma *local_got_offsets; |
| bfd_vma *local_tlsdesc_gotents; |
| Elf_Internal_Rela *rel; |
| Elf_Internal_Rela *relend; |
| |
| if (info->relocatable) |
| return TRUE; |
| |
| htab = elf64_x86_64_hash_table (info); |
| symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (input_bfd); |
| local_got_offsets = elf_local_got_offsets (input_bfd); |
| local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd); |
| |
| rel = relocs; |
| relend = relocs + input_section->reloc_count; |
| for (; rel < relend; rel++) |
| { |
| unsigned int r_type; |
| reloc_howto_type *howto; |
| unsigned long r_symndx; |
| struct elf_link_hash_entry *h; |
| Elf_Internal_Sym *sym; |
| asection *sec; |
| bfd_vma off, offplt; |
| bfd_vma relocation; |
| bfd_boolean unresolved_reloc; |
| bfd_reloc_status_type r; |
| int tls_type; |
| |
| r_type = ELF64_R_TYPE (rel->r_info); |
| if (r_type == (int) R_X86_64_GNU_VTINHERIT |
| || r_type == (int) R_X86_64_GNU_VTENTRY) |
| continue; |
| |
| if (r_type >= R_X86_64_max) |
| { |
| bfd_set_error (bfd_error_bad_value); |
| return FALSE; |
| } |
| |
| howto = x86_64_elf_howto_table + r_type; |
| r_symndx = ELF64_R_SYM (rel->r_info); |
| h = NULL; |
| sym = NULL; |
| sec = NULL; |
| unresolved_reloc = FALSE; |
| if (r_symndx < symtab_hdr->sh_info) |
| { |
| sym = local_syms + r_symndx; |
| sec = local_sections[r_symndx]; |
| |
| relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| } |
| else |
| { |
| bfd_boolean warned; |
| |
| RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| r_symndx, symtab_hdr, sym_hashes, |
| h, sec, relocation, |
| unresolved_reloc, warned); |
| } |
| /* When generating a shared object, the relocations handled here are |
| copied into the output file to be resolved at run time. */ |
| switch (r_type) |
| { |
| case R_X86_64_GOT32: |
| /* Relocation is to the entry for this symbol in the global |
| offset table. */ |
| case R_X86_64_GOTPCREL: |
| /* Use global offset table as symbol value. */ |
| if (htab->sgot == NULL) |
| abort (); |
| |
| if (h != NULL) |
| { |
| bfd_boolean dyn; |
| |
| off = h->got.offset; |
| dyn = htab->elf.dynamic_sections_created; |
| |
| if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| || (info->shared |
| && SYMBOL_REFERENCES_LOCAL (info, h)) |
| || (ELF_ST_VISIBILITY (h->other) |
| && h->root.type == bfd_link_hash_undefweak)) |
| { |
| /* This is actually a static link, or it is a -Bsymbolic |
| link and the symbol is defined locally, or the symbol |
| was forced to be local because of a version file. We |
| must initialize this entry in the global offset table. |
| Since the offset must always be a multiple of 8, we |
| use the least significant bit to record whether we |
| have initialized it already. |
| |
| When doing a dynamic link, we create a .rela.got |
| relocation entry to initialize the value. This is |
| done in the finish_dynamic_symbol routine. */ |
| if ((off & 1) != 0) |
| off &= ~1; |
| else |
| { |
| bfd_put_64 (output_bfd, relocation, |
| htab->sgot->contents + off); |
| h->got.offset |= 1; |
| } |
| } |
| else |
| unresolved_reloc = FALSE; |
| } |
| else |
| { |
| if (local_got_offsets == NULL) |
| abort (); |
| |
| off = local_got_offsets[r_symndx]; |
| |
| /* The offset must always be a multiple of 8. We use |
| the least significant bit to record whether we have |
| already generated the necessary reloc. */ |
| if ((off & 1) != 0) |
| off &= ~1; |
| else |
| { |
| bfd_put_64 (output_bfd, relocation, |
| htab->sgot->contents + off); |
| |
| if (info->shared) |
| { |
| asection *s; |
| Elf_Internal_Rela outrel; |
| bfd_byte *loc; |
| |
| /* We need to generate a R_X86_64_RELATIVE reloc |
| for the dynamic linker. */ |
| s = htab->srelgot; |
| if (s == NULL) |
| abort (); |
| |
| outrel.r_offset = (htab->sgot->output_section->vma |
| + htab->sgot->output_offset |
| + off); |
| outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); |
| outrel.r_addend = relocation; |
| loc = s->contents; |
| loc += s->reloc_count++ * sizeof (Elf64_External_Rela); |
| bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| } |
| |
| local_got_offsets[r_symndx] |= 1; |
| } |
| } |
| |
| if (off >= (bfd_vma) -2) |
| abort (); |
| |
| relocation = htab->sgot->output_section->vma |
| + htab->sgot->output_offset + off; |
| if (r_type != R_X86_64_GOTPCREL) |
| relocation -= htab->sgotplt->output_section->vma |
| - htab->sgotplt->output_offset; |
| |
| break; |
| |
| case R_X86_64_GOTOFF64: |
| /* Relocation is relative to the start of the global offset |
| table. */ |
| |
| /* Check to make sure it isn't a protected function symbol |
| for shared library since it may not be local when used |
| as function address. */ |
| if (info->shared |
| && h |
| && h->def_regular |
| && h->type == STT_FUNC |
| && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| { |
| (*_bfd_error_handler) |
| (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"), |
| input_bfd, h->root.root.string); |
| bfd_set_error (bfd_error_bad_value); |
| return FALSE; |
| } |
| |
| /* Note that sgot is not involved in this |
| calculation. We always want the start of .got.plt. If we |
| defined _GLOBAL_OFFSET_TABLE_ in a different way, as is |
| permitted by the ABI, we might have to change this |
| calculation. */ |
| relocation -= htab->sgotplt->output_section->vma |
| + htab->sgotplt->output_offset; |
| break; |
| |
| case R_X86_64_GOTPC32: |
| /* Use global offset table as symbol value. */ |
| relocation = htab->sgotplt->output_section->vma |
| + htab->sgotplt->output_offset; |
| unresolved_reloc = FALSE; |
| break; |
| |
| case R_X86_64_PLT32: |
| /* Relocation is to the entry for this symbol in the |
| procedure linkage table. */ |
| |
| /* Resolve a PLT32 reloc against a local symbol directly, |
| without using the procedure linkage table. */ |
| if (h == NULL) |
| break; |
| |
| if (h->plt.offset == (bfd_vma) -1 |
| || htab->splt == NULL) |
| { |
| /* We didn't make a PLT entry for this symbol. This |
| happens when statically linking PIC code, or when |
| using -Bsymbolic. */ |
| break; |
| } |
| |
| relocation = (htab->splt->output_section->vma |
| + htab->splt->output_offset |
| + h->plt.offset); |
| unresolved_reloc = FALSE; |
| break; |
| |
| case R_X86_64_PC8: |
| case R_X86_64_PC16: |
| case R_X86_64_PC32: |
| if (info->shared |
| && !SYMBOL_REFERENCES_LOCAL (info, h) |
| && (input_section->flags & SEC_ALLOC) != 0 |
| && (input_section->flags & SEC_READONLY) != 0 |
| && (!h->def_regular |
| || r_type != R_X86_64_PC32 |
| || h->type != STT_FUNC |
| || ELF_ST_VISIBILITY (h->other) != STV_PROTECTED |
| || !is_32bit_relative_branch (contents, |
| rel->r_offset))) |
| { |
| if (h->def_regular |
| && r_type == R_X86_64_PC32 |
| && h->type == STT_FUNC |
| && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| (*_bfd_error_handler) |
| (_("%B: relocation R_X86_64_PC32 against protected function `%s' can not be used when making a shared object"), |
| input_bfd, h->root.root.string); |
| else |
| (*_bfd_error_handler) |
| (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), |
| input_bfd, x86_64_elf_howto_table[r_type].name, |
| h->root.root.string); |
| bfd_set_error (bfd_error_bad_value); |
| return FALSE; |
| } |
| /* Fall through. */ |
| |
| case R_X86_64_8: |
| case R_X86_64_16: |
| case R_X86_64_32: |
| case R_X86_64_PC64: |
| case R_X86_64_64: |
| /* FIXME: The ABI says the linker should make sure the value is |
| the same when it's zeroextended to 64 bit. */ |
| |
| /* r_symndx will be zero only for relocs against symbols |
| from removed linkonce sections, or sections discarded by |
| a linker script. */ |
| if (r_symndx == 0 |
| || (input_section->flags & SEC_ALLOC) == 0) |
| break; |
| |
| if ((info->shared |
| && (h == NULL |
| || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| || h->root.type != bfd_link_hash_undefweak) |
| && ((r_type != R_X86_64_PC8 |
| && r_type != R_X86_64_PC16 |
| && r_type != R_X86_64_PC32 |
| && r_type != R_X86_64_PC64) |
| || !SYMBOL_CALLS_LOCAL (info, h))) |
| || (ELIMINATE_COPY_RELOCS |
| && !info->shared |
| && h != NULL |
| && h->dynindx != -1 |
| && !h->non_got_ref |
| && ((h->def_dynamic |
| && !h->def_regular) |
| || h->root.type == bfd_link_hash_undefweak |
| || h->root.type == bfd_link_hash_undefined))) |
| { |
| Elf_Internal_Rela outrel; |
| bfd_byte *loc; |
| bfd_boolean skip, relocate; |
| asection *sreloc; |
| |
| /* When generating a shared object, these relocations |
| are copied into the output file to be resolved at run |
| time. */ |
| skip = FALSE; |
| relocate = FALSE; |
| |
| outrel.r_offset = |
| _bfd_elf_section_offset (output_bfd, info, input_section, |
| rel->r_offset); |
| if (outrel.r_offset == (bfd_vma) -1) |
| skip = TRUE; |
| else if (outrel.r_offset == (bfd_vma) -2) |
| skip = TRUE, relocate = TRUE; |
| |
| outrel.r_offset += (input_section->output_section->vma |
| + input_section->output_offset); |
| |
| if (skip) |
| memset (&outrel, 0, sizeof outrel); |
| |
| /* h->dynindx may be -1 if this symbol was marked to |
| become local. */ |
| else if (h != NULL |
| && h->dynindx != -1 |
| && (r_type == R_X86_64_PC8 |
| || r_type == R_X86_64_PC16 |
| || r_type == R_X86_64_PC32 |
| || r_type == R_X86_64_PC64 |
| || !info->shared |
| || !info->symbolic |
| || !h->def_regular)) |
| { |
| outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); |
| outrel.r_addend = rel->r_addend; |
| } |
| else |
| { |
| /* This symbol is local, or marked to become local. */ |
| if (r_type == R_X86_64_64) |
| { |
| relocate = TRUE; |
| outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); |
| outrel.r_addend = relocation + rel->r_addend; |
| } |
| else |
| { |
| long sindx; |
| |
| if (bfd_is_abs_section (sec)) |
| sindx = 0; |
| else if (sec == NULL || sec->owner == NULL) |
| { |
| bfd_set_error (bfd_error_bad_value); |
| return FALSE; |
| } |
| else |
| { |
| asection *osec; |
| |
| osec = sec->output_section; |
| sindx = elf_section_data (osec)->dynindx; |
| BFD_ASSERT (sindx > 0); |
| } |
| |
| outrel.r_info = ELF64_R_INFO (sindx, r_type); |
| outrel.r_addend = relocation + rel->r_addend; |
| } |
| } |
| |
| sreloc = elf_section_data (input_section)->sreloc; |
| if (sreloc == NULL) |
| abort (); |
| |
| loc = sreloc->contents; |
| loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); |
| bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| |
| /* If this reloc is against an external symbol, we do |
| not want to fiddle with the addend. Otherwise, we |
| need to include the symbol value so that it becomes |
| an addend for the dynamic reloc. */ |
| if (! relocate) |
| continue; |
| } |
| |
| break; |
| |
| case R_X86_64_TLSGD: |
| case R_X86_64_GOTPC32_TLSDESC: |
| case R_X86_64_TLSDESC_CALL: |
| case R_X86_64_GOTTPOFF: |
| r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL); |
| tls_type = GOT_UNKNOWN; |
| if (h == NULL && local_got_offsets) |
| tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx]; |
| else if (h != NULL) |
| { |
| tls_type = elf64_x86_64_hash_entry (h)->tls_type; |
| if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE) |
| r_type = R_X86_64_TPOFF32; |
| } |
| if (r_type == R_X86_64_TLSGD |
| || r_type == R_X86_64_GOTPC32_TLSDESC |
| || r_type == R_X86_64_TLSDESC_CALL) |
| { |
| if (tls_type == GOT_TLS_IE) |
| r_type = R_X86_64_GOTTPOFF; |
| } |
| |
| if (r_type == R_X86_64_TPOFF32) |
| { |
| BFD_ASSERT (! unresolved_reloc); |
| if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD) |
| { |
| unsigned int i; |
| static unsigned char tlsgd[8] |
| = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 }; |
| |
| /* GD->LE transition. |
| .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| .word 0x6666; rex64; call __tls_get_addr@plt |
| Change it into: |
| movq %fs:0, %rax |
| leaq foo@tpoff(%rax), %rax */ |
| BFD_ASSERT (rel->r_offset >= 4); |
| for (i = 0; i < 4; i++) |
| BFD_ASSERT (bfd_get_8 (input_bfd, |
| contents + rel->r_offset - 4 + i) |
| == tlsgd[i]); |
| BFD_ASSERT (rel->r_offset + 12 <= input_section->size); |
| for (i = 0; i < 4; i++) |
| BFD_ASSERT (bfd_get_8 (input_bfd, |
| contents + rel->r_offset + 4 + i) |
| == tlsgd[i+4]); |
| BFD_ASSERT (rel + 1 < relend); |
| BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); |
| memcpy (contents + rel->r_offset - 4, |
| "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", |
| 16); |
| bfd_put_32 (output_bfd, tpoff (info, relocation), |
| contents + rel->r_offset + 8); |
| /* Skip R_X86_64_PLT32. */ |
| rel++; |
| continue; |
| } |
| else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) |
| { |
| /* GDesc -> LE transition. |
| It's originally something like: |
| leaq x@tlsdesc(%rip), %rax |
| |
| Change it to: |
| movl $x@tpoff, %rax |
| |
| Registers other than %rax may be set up here. */ |
| |
| unsigned int val, type, type2; |
| bfd_vma roff; |
| |
| /* First, make sure it's a leaq adding rip to a |
| 32-bit offset into any register, although it's |
| probably almost always going to be rax. */ |
| roff = rel->r_offset; |
| BFD_ASSERT (roff >= 3); |
| type = bfd_get_8 (input_bfd, contents + roff - 3); |
| BFD_ASSERT ((type & 0xfb) == 0x48); |
| type2 = bfd_get_8 (input_bfd, contents + roff - 2); |
| BFD_ASSERT (type2 == 0x8d); |
| val = bfd_get_8 (input_bfd, contents + roff - 1); |
| BFD_ASSERT ((val & 0xc7) == 0x05); |
| BFD_ASSERT (roff + 4 <= input_section->size); |
| |
| /* Now modify the instruction as appropriate. */ |
| bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1), |
| contents + roff - 3); |
| bfd_put_8 (output_bfd, 0xc7, contents + roff - 2); |
| bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| contents + roff - 1); |
| bfd_put_32 (output_bfd, tpoff (info, relocation), |
| contents + roff); |
| continue; |
| } |
| else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) |
| { |
| /* GDesc -> LE transition. |
| It's originally: |
| call *(%rax) |
| Turn it into: |
| nop; nop. */ |
| |
| unsigned int val, type; |
| bfd_vma roff; |
| |
| /* First, make sure it's a call *(%rax). */ |
| roff = rel->r_offset; |
| BFD_ASSERT (roff + 2 <= input_section->size); |
| type = bfd_get_8 (input_bfd, contents + roff); |
| BFD_ASSERT (type == 0xff); |
| val = bfd_get_8 (input_bfd, contents + roff + 1); |
| BFD_ASSERT (val == 0x10); |
| |
| /* Now modify the instruction as appropriate. */ |
| bfd_put_8 (output_bfd, 0x90, contents + roff); |
| bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| continue; |
| } |
| else |
| { |
| unsigned int val, type, reg; |
| |
| /* IE->LE transition: |
| Originally it can be one of: |
| movq foo@gottpoff(%rip), %reg |
| addq foo@gottpoff(%rip), %reg |
| We change it into: |
| movq $foo, %reg |
| leaq foo(%reg), %reg |
| addq $foo, %reg. */ |
| BFD_ASSERT (rel->r_offset >= 3); |
| val = bfd_get_8 (input_bfd, contents + rel->r_offset - 3); |
| BFD_ASSERT (val == 0x48 || val == 0x4c); |
| type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| BFD_ASSERT (type == 0x8b || type == 0x03); |
| reg = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| BFD_ASSERT ((reg & 0xc7) == 5); |
| reg >>= 3; |
| BFD_ASSERT (rel->r_offset + 4 <= input_section->size); |
| if (type == 0x8b) |
| { |
| /* movq */ |
| if (val == 0x4c) |
| bfd_put_8 (output_bfd, 0x49, |
| contents + rel->r_offset - 3); |
| bfd_put_8 (output_bfd, 0xc7, |
| contents + rel->r_offset - 2); |
| bfd_put_8 (output_bfd, 0xc0 | reg, |
| contents + rel->r_offset - 1); |
| } |
| else if (reg == 4) |
| { |
| /* addq -> addq - addressing with %rsp/%r12 is |
| special */ |
| if (val == 0x4c) |
| bfd_put_8 (output_bfd, 0x49, |
| contents + rel->r_offset - 3); |
| bfd_put_8 (output_bfd, 0x81, |
| contents + rel->r_offset - 2); |
| bfd_put_8 (output_bfd, 0xc0 | reg, |
| contents + rel->r_offset - 1); |
| } |
| else |
| { |
| /* addq -> leaq */ |
| if (val == 0x4c) |
| bfd_put_8 (output_bfd, 0x4d, |
| contents + rel->r_offset - 3); |
| bfd_put_8 (output_bfd, 0x8d, |
| contents + rel->r_offset - 2); |
| bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), |
| contents + rel->r_offset - 1); |
| } |
| bfd_put_32 (output_bfd, tpoff (info, relocation), |
| contents + rel->r_offset); |
| continue; |
| } |
| } |
| |
| if (htab->sgot == NULL) |
| abort (); |
| |
| if (h != NULL) |
| { |
| off = h->got.offset; |
| offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got; |
| } |
| else |
| { |
| if (local_got_offsets == NULL) |
| abort (); |
| |
| off = local_got_offsets[r_symndx]; |
| offplt = local_tlsdesc_gotents[r_symndx]; |
| } |
| |
| if ((off & 1) != 0) |
| off &= ~1; |
| else |
| { |
| Elf_Internal_Rela outrel; |
| bfd_byte *loc; |
| int dr_type, indx; |
| asection *sreloc; |
| |
| if (htab->srelgot == NULL) |
| abort (); |
| |
| indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| |
| if (GOT_TLS_GDESC_P (tls_type)) |
| { |
| outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC); |
| BFD_ASSERT (htab->sgotplt_jump_table_size + offplt |
| + 2 * GOT_ENTRY_SIZE <= htab->sgotplt->size); |
| outrel.r_offset = (htab->sgotplt->output_section->vma |
| + htab->sgotplt->output_offset |
| + offplt |
| + htab->sgotplt_jump_table_size); |
| sreloc = htab->srelplt; |
| loc = sreloc->contents; |
| loc += sreloc->reloc_count++ |
| * sizeof (Elf64_External_Rela); |
| BFD_ASSERT (loc + sizeof (Elf64_External_Rela) |
| <= sreloc->contents + sreloc->size); |
| if (indx == 0) |
| outrel.r_addend = relocation - dtpoff_base (info); |
| else |
| outrel.r_addend = 0; |
| bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| } |
| |
| sreloc = htab->srelgot; |
| |
| outrel.r_offset = (htab->sgot->output_section->vma |
| + htab->sgot->output_offset + off); |
| |
| if (GOT_TLS_GD_P (tls_type)) |
| dr_type = R_X86_64_DTPMOD64; |
| else if (GOT_TLS_GDESC_P (tls_type)) |
| goto dr_done; |
| else |
| dr_type = R_X86_64_TPOFF64; |
| |
| bfd_put_64 (output_bfd, 0, htab->sgot->contents + off); |
| outrel.r_addend = 0; |
| if ((dr_type == R_X86_64_TPOFF64 |
| || dr_type == R_X86_64_TLSDESC) && indx == 0) |
| outrel.r_addend = relocation - dtpoff_base (info); |
| outrel.r_info = ELF64_R_INFO (indx, dr_type); |
| |
| loc = sreloc->contents; |
| loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); |
| BFD_ASSERT (loc + sizeof (Elf64_External_Rela) |
| <= sreloc->contents + sreloc->size); |
| bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| |
| if (GOT_TLS_GD_P (tls_type)) |
| { |
| if (indx == 0) |
| { |
| BFD_ASSERT (! unresolved_reloc); |
| bfd_put_64 (output_bfd, |
| relocation - dtpoff_base (info), |
| htab->sgot->contents + off + GOT_ENTRY_SIZE); |
| } |
| else |
| { |
| bfd_put_64 (output_bfd, 0, |
| htab->sgot->contents + off + GOT_ENTRY_SIZE); |
| outrel.r_info = ELF64_R_INFO (indx, |
| R_X86_64_DTPOFF64); |
| outrel.r_offset += GOT_ENTRY_SIZE; |
| sreloc->reloc_count++; |
| loc += sizeof (Elf64_External_Rela); |
| BFD_ASSERT (loc + sizeof (Elf64_External_Rela) |
| <= sreloc->contents + sreloc->size); |
| bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| } |
| } |
| |
| dr_done: |
| if (h != NULL) |
| h->got.offset |= 1; |
| else |
| local_got_offsets[r_symndx] |= 1; |
| } |
| |
| if (off >= (bfd_vma) -2 |
| && ! GOT_TLS_GDESC_P (tls_type)) |
| abort (); |
| if (r_type == ELF64_R_TYPE (rel->r_info)) |
| { |
| if (r_type == R_X86_64_GOTPC32_TLSDESC |
| || r_type == R_X86_64_TLSDESC_CALL) |
| relocation = htab->sgotplt->output_section->vma |
| + htab->sgotplt->output_offset |
| + offplt + htab->sgotplt_jump_table_size; |
| else |
| relocation = htab->sgot->output_section->vma |
| + htab->sgot->output_offset + off; |
| unresolved_reloc = FALSE; |
| } |
| else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD) |
| { |
| unsigned int i; |
| static unsigned char tlsgd[8] |
| = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 }; |
| |
| /* GD->IE transition. |
| .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| .word 0x6666; rex64; call __tls_get_addr@plt |
| Change it into: |
| movq %fs:0, %rax |
| addq foo@gottpoff(%rip), %rax */ |
| BFD_ASSERT (rel->r_offset >= 4); |
| for (i = 0; i < 4; i++) |
| BFD_ASSERT (bfd_get_8 (input_bfd, |
| contents + rel->r_offset - 4 + i) |
| == tlsgd[i]); |
| BFD_ASSERT (rel->r_offset + 12 <= input_section->size); |
| for (i = 0; i < 4; i++) |
| BFD_ASSERT (bfd_get_8 (input_bfd, |
| contents + rel->r_offset + 4 + i) |
| == tlsgd[i+4]); |
| BFD_ASSERT (rel + 1 < relend); |
| BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); |
| memcpy (contents + rel->r_offset - 4, |
| "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", |
| 16); |
| |
| relocation = (htab->sgot->output_section->vma |
| + htab->sgot->output_offset + off |
| - rel->r_offset |
| - input_section->output_section->vma |
| - input_section->output_offset |
| - 12); |
| bfd_put_32 (output_bfd, relocation, |
| contents + rel->r_offset + 8); |
| /* Skip R_X86_64_PLT32. */ |
| rel++; |
| continue; |
| } |
| else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) |
| { |
| /* GDesc -> IE transition. |
| It's originally something like: |
| leaq x@tlsdesc(%rip), %rax |
| |
| Change it to: |
| movq x@gottpoff(%rip), %rax # before nop; nop |
| |
| Registers other than %rax may be set up here. */ |
| |
| unsigned int val, type, type2; |
| bfd_vma roff; |
| |
| /* First, make sure it's a leaq adding rip to a 32-bit |
| offset into any register, although it's probably |
| almost always going to be rax. */ |
| roff = rel->r_offset; |
| BFD_ASSERT (roff >= 3); |
| type = bfd_get_8 (input_bfd, contents + roff - 3); |
| BFD_ASSERT ((type & 0xfb) == 0x48); |
| type2 = bfd_get_8 (input_bfd, contents + roff - 2); |
| BFD_ASSERT (type2 == 0x8d); |
| val = bfd_get_8 (input_bfd, contents + roff - 1); |
| BFD_ASSERT ((val & 0xc7) == 0x05); |
| BFD_ASSERT (roff + 4 <= input_section->size); |
| |
| /* Now modify the instruction as appropriate. */ |
| /* To turn a leaq into a movq in the form we use it, it |
| suffices to change the second byte from 0x8d to |
| 0x8b. */ |
| bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); |
| |
| bfd_put_32 (output_bfd, |
| htab->sgot->output_section->vma |
| + htab->sgot->output_offset + off |
| - rel->r_offset |
| - input_section->output_section->vma |
| - input_section->output_offset |
| - 4, |
| contents + roff); |
| continue; |
| } |
| else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) |
| { |
| /* GDesc -> IE transition. |
| It's originally: |
| call *(%rax) |
| |
| Change it to: |
| nop; nop. */ |
| |
| unsigned int val, type; |
| bfd_vma roff; |
| |
| /* First, make sure it's a call *(%eax). */ |
| roff = rel->r_offset; |
| BFD_ASSERT (roff + 2 <= input_section->size); |
| type = bfd_get_8 (input_bfd, contents + roff); |
| BFD_ASSERT (type == 0xff); |
| val = bfd_get_8 (input_bfd, contents + roff + 1); |
| BFD_ASSERT (val == 0x10); |
| |
| /* Now modify the instruction as appropriate. */ |
| bfd_put_8 (output_bfd, 0x90, contents + roff); |
| bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| |
| continue; |
| } |
| else |
| BFD_ASSERT (FALSE); |
| break; |
| |
| case R_X86_64_TLSLD: |
| if (! info->shared) |
| { |
| /* LD->LE transition: |
| Ensure it is: |
| leaq foo@tlsld(%rip), %rdi; call __tls_get_addr@plt. |
| We change it into: |
| .word 0x6666; .byte 0x66; movl %fs:0, %rax. */ |
| BFD_ASSERT (rel->r_offset >= 3); |
| BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 3) |
| == 0x48); |
| BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) |
| == 0x8d); |
| BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 1) |
| == 0x3d); |
| BFD_ASSERT (rel->r_offset + 9 <= input_section->size); |
| BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) |
| == 0xe8); |
| BFD_ASSERT (rel + 1 < relend); |
| BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); |
| memcpy (contents + rel->r_offset - 3, |
| "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); |
| /* Skip R_X86_64_PLT32. */ |
| rel++; |
| continue; |
| } |
| |
| if (htab->sgot == NULL) |
| abort (); |
| |
| off = htab->tls_ld_got.offset; |
| if (off & 1) |
| off &= ~1; |
| else |
| { |
| Elf_Internal_Rela outrel; |
| bfd_byte *loc; |
| |
| if (htab->srelgot == NULL) |
| abort (); |
| |
| outrel.r_offset = (htab->sgot->output_section->vma |
| + htab->sgot->output_offset + off); |
| |
| bfd_put_64 (output_bfd, 0, |
| htab->sgot->contents + off); |
| bfd_put_64 (output_bfd, 0, |
| htab->sgot->contents + off + GOT_ENTRY_SIZE); |
| outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64); |
| outrel.r_addend = 0; |
| loc = htab->srelgot->contents; |
| loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); |
| bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| htab->tls_ld_got.offset |= 1; |
| } |
| relocation = htab->sgot->output_section->vma |
| + htab->sgot->output_offset + off; |
| unresolved_reloc = FALSE; |
| break; |
| |
| case R_X86_64_DTPOFF32: |
| if (info->shared || (input_section->flags & SEC_CODE) == 0) |
| relocation -= dtpoff_base (info); |
| else |
| relocation = tpoff (info, relocation); |
| break; |
| |
| case R_X86_64_TPOFF32: |
| BFD_ASSERT (! info->shared); |
| relocation = tpoff (info, relocation); |
| break; |
| |
| default: |
| break; |
| } |
| |
| /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| because such sections are not SEC_ALLOC and thus ld.so will |
| not process them. */ |
| if (unresolved_reloc |
| && !((input_section->flags & SEC_DEBUGGING) != 0 |
| && h->def_dynamic)) |
| (*_bfd_error_handler) |
| (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), |
| input_bfd, |
| input_section, |
| (long) rel->r_offset, |
| howto->name, |
| h->root.root.string); |
| |
| r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| contents, rel->r_offset, |
| relocation, rel->r_addend); |
| |
| if (r != bfd_reloc_ok) |
| { |
| const char *name; |
| |
| if (h != NULL) |
| name = h->root.root.string; |
| else |
| { |
| name = bfd_elf_string_from_elf_section (input_bfd, |
| symtab_hdr->sh_link, |
| sym->st_name); |
| if (name == NULL) |
| return FALSE; |
| if (*name == '\0') |
| name = bfd_section_name (input_bfd, sec); |
| } |
| |
| if (r == bfd_reloc_overflow) |
| { |
| if (h != NULL |
| && h->root.type == bfd_link_hash_undefweak |
| && howto->pc_relative) |
| /* Ignore reloc overflow on branches to undefweak syms. */ |
| continue; |
| |
| if (! ((*info->callbacks->reloc_overflow) |
| (info, (h ? &h->root : NULL), name, howto->name, |
| (bfd_vma) 0, input_bfd, input_section, |
| rel->r_offset))) |
| return FALSE; |
| } |
| else |
| { |
| (*_bfd_error_handler) |
| (_("%B(%A+0x%lx): reloc against `%s': error %d"), |
| input_bfd, input_section, |
| (long) rel->r_offset, name, (int) r); |
| return FALSE; |
| } |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| /* Finish up dynamic symbol handling. We set the contents of various |
| dynamic sections here. */ |
| |
| static bfd_boolean |
| elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd, |
| struct bfd_link_info *info, |
| struct elf_link_hash_entry *h, |
| Elf_Internal_Sym *sym) |
| { |
| struct elf64_x86_64_link_hash_table *htab; |
| |
| htab = elf64_x86_64_hash_table (info); |
| |
| if (h->plt.offset != (bfd_vma) -1) |
| { |
| bfd_vma plt_index; |
| bfd_vma got_offset; |
| Elf_Internal_Rela rela; |
| bfd_byte *loc; |
| |
| /* This symbol has an entry in the procedure linkage table. Set |
| it up. */ |
| if (h->dynindx == -1 |
| || htab->splt == NULL |
| || htab->sgotplt == NULL |
| || htab->srelplt == NULL) |
| abort (); |
| |
| /* Get the index in the procedure linkage table which |
| corresponds to this symbol. This is the index of this symbol |
| in all the symbols for which we are making plt entries. The |
| first entry in the procedure linkage table is reserved. */ |
| plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| |
| /* Get the offset into the .got table of the entry that |
| corresponds to this function. Each .got entry is GOT_ENTRY_SIZE |
| bytes. The first three are reserved for the dynamic linker. */ |
| got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; |
| |
| /* Fill in the entry in the procedure linkage table. */ |
| memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry, |
| PLT_ENTRY_SIZE); |
| |
| /* Insert the relocation positions of the plt section. The magic |
| numbers at the end of the statements are the positions of the |
| relocations in the plt section. */ |
| /* Put offset for jmp *name@GOTPCREL(%rip), since the |
| instruction uses 6 bytes, subtract this value. */ |
| bfd_put_32 (output_bfd, |
| (htab->sgotplt->output_section->vma |
| + htab->sgotplt->output_offset |
| + got_offset |
| - htab->splt->output_section->vma |
| - htab->splt->output_offset |
| - h->plt.offset |
| - 6), |
| htab->splt->contents + h->plt.offset + 2); |
| /* Put relocation index. */ |
| bfd_put_32 (output_bfd, plt_index, |
| htab->splt->contents + h->plt.offset + 7); |
| /* Put offset for jmp .PLT0. */ |
| bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| htab->splt->contents + h->plt.offset + 12); |
| |
| /* Fill in the entry in the global offset table, initially this |
| points to the pushq instruction in the PLT which is at offset 6. */ |
| bfd_put_64 (output_bfd, (htab->splt->output_section->vma |
| + htab->splt->output_offset |
| + h->plt.offset + 6), |
| htab->sgotplt->contents + got_offset); |
| |
| /* Fill in the entry in the .rela.plt section. */ |
| rela.r_offset = (htab->sgotplt->output_section->vma |
| + htab->sgotplt->output_offset |
| + got_offset); |
| rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT); |
| rela.r_addend = 0; |
| loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela); |
| bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| |
| if (!h->def_regular) |
| { |
| /* Mark the symbol as undefined, rather than as defined in |
| the .plt section. Leave the value if there were any |
| relocations where pointer equality matters (this is a clue |
| for the dynamic linker, to make function pointer |
| comparisons work between an application and shared |
| library), otherwise set it to zero. If a function is only |
| called from a binary, there is no need to slow down |
| shared libraries because of that. */ |
| sym->st_shndx = SHN_UNDEF; |
| if (!h->pointer_equality_needed) |
| sym->st_value = 0; |
| } |
| } |
| |
| if (h->got.offset != (bfd_vma) -1 |
| && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type) |
| && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE) |
| { |
| Elf_Internal_Rela rela; |
| bfd_byte *loc; |
| |
| /* This symbol has an entry in the global offset table. Set it |
| up. */ |
| if (htab->sgot == NULL || htab->srelgot == NULL) |
| abort (); |
| |
| rela.r_offset = (htab->sgot->output_section->vma |
| + htab->sgot->output_offset |
| + (h->got.offset &~ (bfd_vma) 1)); |
| |
| /* If this is a static link, or it is a -Bsymbolic link and the |
| symbol is defined locally or was forced to be local because |
| of a version file, we just want to emit a RELATIVE reloc. |
| The entry in the global offset table will already have been |
| initialized in the relocate_section function. */ |
| if (info->shared |
| && SYMBOL_REFERENCES_LOCAL (info, h)) |
| { |
| BFD_ASSERT((h->got.offset & 1) != 0); |
| rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); |
| rela.r_addend = (h->root.u.def.value |
| + h->root.u.def.section->output_section->vma |
| + h->root.u.def.section->output_offset); |
| } |
| else |
| { |
| BFD_ASSERT((h->got.offset & 1) == 0); |
| bfd_put_64 (output_bfd, (bfd_vma) 0, |
| htab->sgot->contents + h->got.offset); |
| rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT); |
| rela.r_addend = 0; |
| } |
| |
| loc = htab->srelgot->contents; |
| loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); |
| bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| } |
| |
| if (h->needs_copy) |
| { |
| Elf_Internal_Rela rela; |
| bfd_byte *loc; |
| |
| /* This symbol needs a copy reloc. Set it up. */ |
| |
| if (h->dynindx == -1 |
| || (h->root.type != bfd_link_hash_defined |
| && h->root.type != bfd_link_hash_defweak) |
| || htab->srelbss == NULL) |
| abort (); |
| |
| rela.r_offset = (h->root.u.def.value |
| + h->root.u.def.section->output_section->vma |
| + h->root.u.def.section->output_offset); |
| rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY); |
| rela.r_addend = 0; |
| loc = htab->srelbss->contents; |
| loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela); |
| bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| } |
| |
| /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| || h == htab->elf.hgot) |
| sym->st_shndx = SHN_ABS; |
| |
| return TRUE; |
| } |
| |
| /* Used to decide how to sort relocs in an optimal manner for the |
| dynamic linker, before writing them out. */ |
| |
| static enum elf_reloc_type_class |
| elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela) |
| { |
| switch ((int) ELF64_R_TYPE (rela->r_info)) |
| { |
| case R_X86_64_RELATIVE: |
| return reloc_class_relative; |
| case R_X86_64_JUMP_SLOT: |
| return reloc_class_plt; |
| case R_X86_64_COPY: |
| return reloc_class_copy; |
| default: |
| return reloc_class_normal; |
| } |
| } |
| |
| /* Finish up the dynamic sections. */ |
| |
| static bfd_boolean |
| elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) |
| { |
| struct elf64_x86_64_link_hash_table *htab; |
| bfd *dynobj; |
| asection *sdyn; |
| |
| htab = elf64_x86_64_hash_table (info); |
| dynobj = htab->elf.dynobj; |
| sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| |
| if (htab->elf.dynamic_sections_created) |
| { |
| Elf64_External_Dyn *dyncon, *dynconend; |
| |
| if (sdyn == NULL || htab->sgot == NULL) |
| abort (); |
| |
| dyncon = (Elf64_External_Dyn *) sdyn->contents; |
| dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); |
| for (; dyncon < dynconend; dyncon++) |
| { |
| Elf_Internal_Dyn dyn; |
| asection *s; |
| |
| bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); |
| |
| switch (dyn.d_tag) |
| { |
| default: |
| continue; |
| |
| case DT_PLTGOT: |
| s = htab->sgotplt; |
| dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| break; |
| |
| case DT_JMPREL: |
| dyn.d_un.d_ptr = htab->srelplt->output_section->vma; |
| break; |
| |
| case DT_PLTRELSZ: |
| s = htab->srelplt->output_section; |
| dyn.d_un.d_val = s->size; |
| break; |
| |
| case DT_RELASZ: |
| /* The procedure linkage table relocs (DT_JMPREL) should |
| not be included in the overall relocs (DT_RELA). |
| Therefore, we override the DT_RELASZ entry here to |
| make it not include the JMPREL relocs. Since the |
| linker script arranges for .rela.plt to follow all |
| other relocation sections, we don't have to worry |
| about changing the DT_RELA entry. */ |
| if (htab->srelplt != NULL) |
| { |
| s = htab->srelplt->output_section; |
| dyn.d_un.d_val -= s->size; |
| } |
| break; |
| |
| case DT_TLSDESC_PLT: |
| s = htab->splt; |
| dyn.d_un.d_ptr = s->output_section->vma + s->output_offset |
| + htab->tlsdesc_plt; |
| break; |
| |
| case DT_TLSDESC_GOT: |
| s = htab->sgot; |
| dyn.d_un.d_ptr = s->output_section->vma + s->output_offset |
| + htab->tlsdesc_got; |
| break; |
| } |
| |
| bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); |
| } |
| |
| /* Fill in the special first entry in the procedure linkage table. */ |
| if (htab->splt && htab->splt->size > 0) |
| { |
| /* Fill in the first entry in the procedure linkage table. */ |
| memcpy (htab->splt->contents, elf64_x86_64_plt0_entry, |
| PLT_ENTRY_SIZE); |
| /* Add offset for pushq GOT+8(%rip), since the instruction |
| uses 6 bytes subtract this value. */ |
| bfd_put_32 (output_bfd, |
| (htab->sgotplt->output_section->vma |
| + htab->sgotplt->output_offset |
| + 8 |
| - htab->splt->output_section->vma |
| - htab->splt->output_offset |
| - 6), |
| htab->splt->contents + 2); |
| /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to |
| the end of the instruction. */ |
| bfd_put_32 (output_bfd, |
| (htab->sgotplt->output_section->vma |
| + htab->sgotplt->output_offset |
| + 16 |
| - htab->splt->output_section->vma |
| - htab->splt->output_offset |
| - 12), |
| htab->splt->contents + 8); |
| |
| elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize = |
| PLT_ENTRY_SIZE; |
| |
| if (htab->tlsdesc_plt) |
| { |
| bfd_put_64 (output_bfd, (bfd_vma) 0, |
| htab->sgot->contents + htab->tlsdesc_got); |
| |
| memcpy (htab->splt->contents + htab->tlsdesc_plt, |
| elf64_x86_64_plt0_entry, |
| PLT_ENTRY_SIZE); |
| |
| /* Add offset for pushq GOT+8(%rip), since the |
| instruction uses 6 bytes subtract this value. */ |
| bfd_put_32 (output_bfd, |
| (htab->sgotplt->output_section->vma |
| + htab->sgotplt->output_offset |
| + 8 |
| - htab->splt->output_section->vma |
| - htab->splt->output_offset |
| - htab->tlsdesc_plt |
| - 6), |
| htab->splt->contents + htab->tlsdesc_plt + 2); |
| /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for |
| htab->tlsdesc_got. The 12 is the offset to the end of |
| the instruction. */ |
| bfd_put_32 (output_bfd, |
| (htab->sgot->output_section->vma |
| + htab->sgot->output_offset |
| + htab->tlsdesc_got |
| - htab->splt->output_section->vma |
| - htab->splt->output_offset |
| - htab->tlsdesc_plt |
| - 12), |
| htab->splt->contents + htab->tlsdesc_plt + 8); |
| } |
| } |
| } |
| |
| if (htab->sgotplt) |
| { |
| /* Fill in the first three entries in the global offset table. */ |
| if (htab->sgotplt->size > 0) |
| { |
| /* Set the first entry in the global offset table to the address of |
| the dynamic section. */ |
| if (sdyn == NULL) |
| bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents); |
| else |
| bfd_put_64 (output_bfd, |
| sdyn->output_section->vma + sdyn->output_offset, |
| htab->sgotplt->contents); |
| /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ |
| bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE); |
| bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2); |
| } |
| |
| elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = |
| GOT_ENTRY_SIZE; |
| } |
| |
| if (htab->sgot && htab->sgot->size > 0) |
| elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize |
| = GOT_ENTRY_SIZE; |
| |
| return TRUE; |
| } |
| |
| /* Return address for Ith PLT stub in section PLT, for relocation REL |
| or (bfd_vma) -1 if it should not be included. */ |
| |
| static bfd_vma |
| elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt, |
| const arelent *rel ATTRIBUTE_UNUSED) |
| { |
| return plt->vma + (i + 1) * PLT_ENTRY_SIZE; |
| } |
| |
| /* Handle an x86-64 specific section when reading an object file. This |
| is called when elfcode.h finds a section with an unknown type. */ |
| |
| static bfd_boolean |
| elf64_x86_64_section_from_shdr (bfd *abfd, |
| Elf_Internal_Shdr *hdr, |
| const char *name, |
| int shindex) |
| { |
| if (hdr->sh_type != SHT_X86_64_UNWIND) |
| return FALSE; |
| |
| if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) |
| return FALSE; |
| |
| return TRUE; |
| } |
| |
| /* Hook called by the linker routine which adds symbols from an object |
| file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead |
| of .bss. */ |
| |
| static bfd_boolean |
| elf64_x86_64_add_symbol_hook (bfd *abfd, |
| struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| Elf_Internal_Sym *sym, |
| const char **namep ATTRIBUTE_UNUSED, |
| flagword *flagsp ATTRIBUTE_UNUSED, |
| asection **secp, bfd_vma *valp) |
| { |
| asection *lcomm; |
| |
| switch (sym->st_shndx) |
| { |
| case SHN_X86_64_LCOMMON: |
| lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON"); |
| if (lcomm == NULL) |
| { |
| lcomm = bfd_make_section_with_flags (abfd, |
| "LARGE_COMMON", |
| (SEC_ALLOC |
| | SEC_IS_COMMON |
| | SEC_LINKER_CREATED)); |
| if (lcomm == NULL) |
| return FALSE; |
| elf_section_flags (lcomm) |= SHF_X86_64_LARGE; |
| } |
| *secp = lcomm; |
| *valp = sym->st_size; |
| break; |
| } |
| return TRUE; |
| } |
| |
| |
| /* Given a BFD section, try to locate the corresponding ELF section |
| index. */ |
| |
| static bfd_boolean |
| elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, |
| asection *sec, int *index) |
| { |
| if (sec == &_bfd_elf_large_com_section) |
| { |
| *index = SHN_X86_64_LCOMMON; |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| /* Process a symbol. */ |
| |
| static void |
| elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, |
| asymbol *asym) |
| { |
| elf_symbol_type *elfsym = (elf_symbol_type *) asym; |
| |
| switch (elfsym->internal_elf_sym.st_shndx) |
| { |
| case SHN_X86_64_LCOMMON: |
| asym->section = &_bfd_elf_large_com_section; |
| asym->value = elfsym->internal_elf_sym.st_size; |
| /* Common symbol doesn't set BSF_GLOBAL. */ |
| asym->flags &= ~BSF_GLOBAL; |
| break; |
| } |
| } |
| |
| static bfd_boolean |
| elf64_x86_64_common_definition (Elf_Internal_Sym *sym) |
| { |
| return (sym->st_shndx == SHN_COMMON |
| || sym->st_shndx == SHN_X86_64_LCOMMON); |
| } |
| |
| static unsigned int |
| elf64_x86_64_common_section_index (asection *sec) |
| { |
| if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) |
| return SHN_COMMON; |
| else |
| return SHN_X86_64_LCOMMON; |
| } |
| |
| static asection * |
| elf64_x86_64_common_section (asection *sec) |
| { |
| if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) |
| return bfd_com_section_ptr; |
| else |
| return &_bfd_elf_large_com_section; |
| } |
| |
| static bfd_boolean |
| elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED, |
| struct elf_link_hash_entry *h, |
| Elf_Internal_Sym *sym, |
| asection **psec, |
| bfd_vma *pvalue ATTRIBUTE_UNUSED, |
| unsigned int *pold_alignment ATTRIBUTE_UNUSED, |
| bfd_boolean *skip ATTRIBUTE_UNUSED, |
| bfd_boolean *override ATTRIBUTE_UNUSED, |
| bfd_boolean *type_change_ok ATTRIBUTE_UNUSED, |
| bfd_boolean *size_change_ok ATTRIBUTE_UNUSED, |
| bfd_boolean *newdef ATTRIBUTE_UNUSED, |
| bfd_boolean *newdyn, |
| bfd_boolean *newdyncommon ATTRIBUTE_UNUSED, |
| bfd_boolean *newweak ATTRIBUTE_UNUSED, |
| bfd *abfd ATTRIBUTE_UNUSED, |
| asection **sec, |
| bfd_boolean *olddef ATTRIBUTE_UNUSED, |
| bfd_boolean *olddyn, |
| bfd_boolean *olddyncommon ATTRIBUTE_UNUSED, |
| bfd_boolean *oldweak ATTRIBUTE_UNUSED, |
| bfd *oldbfd, |
| asection **oldsec) |
| { |
| /* A normal common symbol and a large common symbol result in a |
| normal common symbol. We turn the large common symbol into a |
| normal one. */ |
| if (!*olddyn |
| && h->root.type == bfd_link_hash_common |
| && !*newdyn |
| && bfd_is_com_section (*sec) |
| && *oldsec != *sec) |
| { |
| if (sym->st_shndx == SHN_COMMON |
| && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0) |
| { |
| h->root.u.c.p->section |
| = bfd_make_section_old_way (oldbfd, "COMMON"); |
| h->root.u.c.p->section->flags = SEC_ALLOC; |
| } |
| else if (sym->st_shndx == SHN_X86_64_LCOMMON |
| && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0) |
| *psec = *sec = bfd_com_section_ptr; |
| } |
| |
| return TRUE; |
| } |
| |
| static int |
| elf64_x86_64_additional_program_headers (bfd *abfd) |
| { |
| asection *s; |
| int count = 0; |
| |
| /* Check to see if we need a large readonly segment. */ |
| s = bfd_get_section_by_name (abfd, ".lrodata"); |
| if (s && (s->flags & SEC_LOAD)) |
| count++; |
| |
| /* Check to see if we need a large data segment. Since .lbss sections |
| is placed right after the .bss section, there should be no need for |
| a large data segment just because of .lbss. */ |
| s = bfd_get_section_by_name (abfd, ".ldata"); |
| if (s && (s->flags & SEC_LOAD)) |
| count++; |
| |
| return count; |
| } |
| |
| static const struct bfd_elf_special_section |
| elf64_x86_64_special_sections[]= |
| { |
| { ".gnu.linkonce.lb", 16, -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| { ".gnu.linkonce.lr", 16, -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, |
| { ".gnu.linkonce.lt", 16, -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE}, |
| { ".lbss", 5, -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| { ".ldata", 6, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| { ".lrodata", 8, -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, |
| { NULL, 0, 0, 0, 0 } |
| }; |
| |
| #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec |
| #define TARGET_LITTLE_NAME "elf64-x86-64" |
| #define ELF_ARCH bfd_arch_i386 |
| #define ELF_MACHINE_CODE EM_X86_64 |
| #define ELF_MAXPAGESIZE 0x100000 |
| |
| #define elf_backend_can_gc_sections 1 |
| #define elf_backend_can_refcount 1 |
| #define elf_backend_want_got_plt 1 |
| #define elf_backend_plt_readonly 1 |
| #define elf_backend_want_plt_sym 0 |
| #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) |
| #define elf_backend_rela_normal 1 |
| |
| #define elf_info_to_howto elf64_x86_64_info_to_howto |
| |
| #define bfd_elf64_bfd_link_hash_table_create \ |
| elf64_x86_64_link_hash_table_create |
| #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup |
| |
| #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol |
| #define elf_backend_check_relocs elf64_x86_64_check_relocs |
| #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol |
| #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections |
| #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections |
| #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol |
| #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook |
| #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook |
| #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus |
| #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo |
| #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class |
| #define elf_backend_relocate_section elf64_x86_64_relocate_section |
| #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections |
| #define elf_backend_always_size_sections elf64_x86_64_always_size_sections |
| #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val |
| #define elf_backend_object_p elf64_x86_64_elf_object_p |
| #define bfd_elf64_mkobject elf64_x86_64_mkobject |
| |
| #define elf_backend_section_from_shdr \ |
| elf64_x86_64_section_from_shdr |
| |
| #define elf_backend_section_from_bfd_section \ |
| elf64_x86_64_elf_section_from_bfd_section |
| #define elf_backend_add_symbol_hook \ |
| elf64_x86_64_add_symbol_hook |
| #define elf_backend_symbol_processing \ |
| elf64_x86_64_symbol_processing |
| #define elf_backend_common_section_index \ |
| elf64_x86_64_common_section_index |
| #define elf_backend_common_section \ |
| elf64_x86_64_common_section |
| #define elf_backend_common_definition \ |
| elf64_x86_64_common_definition |
| #define elf_backend_merge_symbol \ |
| elf64_x86_64_merge_symbol |
| #define elf_backend_special_sections \ |
| elf64_x86_64_special_sections |
| #define elf_backend_additional_program_headers \ |
| elf64_x86_64_additional_program_headers |
| |
| #include "elf64-target.h" |