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- /* Intel 80386/80486-specific support for 32-bit ELF
- Copyright (C) 1993-2022 Free Software Foundation, Inc.
- 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 3 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 "elfxx-x86.h"
- #include "elf-vxworks.h"
- #include "dwarf2.h"
- #include "opcode/i386.h"
- /* 386 uses REL relocations instead of RELA. */
- #define USE_REL 1
- static reloc_howto_type elf_howto_table[]=
- {
- HOWTO(R_386_NONE, 0, 3, 0, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_NONE",
- true, 0x00000000, 0x00000000, false),
- HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_32",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_PC32",
- true, 0xffffffff, 0xffffffff, true),
- HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_GOT32",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_PLT32",
- true, 0xffffffff, 0xffffffff, true),
- HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_COPY",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_GLOB_DAT",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_RELATIVE",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_GOTOFF",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_GOTPC",
- true, 0xffffffff, 0xffffffff, true),
- /* We have a gap in the reloc numbers here.
- R_386_standard counts the number up to this point, and
- R_386_ext_offset is the value to subtract from a reloc type of
- R_386_16 thru R_386_PC8 to form an index into this table. */
- #define R_386_standard (R_386_GOTPC + 1)
- #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
- /* These relocs are a GNU extension. */
- HOWTO(R_386_TLS_TPOFF, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_IE, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_IE",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_GOTIE, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_LE, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_LE",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_GD, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_GD",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_LDM, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_LDM",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_16, 0, 1, 16, false, 0, complain_overflow_bitfield,
- bfd_elf_generic_reloc, "R_386_16",
- true, 0xffff, 0xffff, false),
- HOWTO(R_386_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield,
- bfd_elf_generic_reloc, "R_386_PC16",
- true, 0xffff, 0xffff, true),
- HOWTO(R_386_8, 0, 0, 8, false, 0, complain_overflow_bitfield,
- bfd_elf_generic_reloc, "R_386_8",
- true, 0xff, 0xff, false),
- HOWTO(R_386_PC8, 0, 0, 8, true, 0, complain_overflow_signed,
- bfd_elf_generic_reloc, "R_386_PC8",
- true, 0xff, 0xff, true),
- #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
- #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
- /* These are common with Solaris TLS implementation. */
- HOWTO(R_386_TLS_LDO_32, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_IE_32, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_IE_32",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_LE_32, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_LE_32",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_SIZE32, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_SIZE32",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_TLS_DESC_CALL, 0, 3, 0, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
- false, 0, 0, false),
- HOWTO(R_386_TLS_DESC, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_TLS_DESC",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_IRELATIVE, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_IRELATIVE",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO(R_386_GOT32X, 0, 2, 32, false, 0, complain_overflow_dont,
- bfd_elf_generic_reloc, "R_386_GOT32X",
- true, 0xffffffff, 0xffffffff, false),
- /* Another gap. */
- #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
- #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
- /* GNU extension to record C++ vtable hierarchy. */
- HOWTO (R_386_GNU_VTINHERIT, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- NULL, /* special_function */
- "R_386_GNU_VTINHERIT", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- /* GNU extension to record C++ vtable member usage. */
- HOWTO (R_386_GNU_VTENTRY, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- _bfd_elf_rel_vtable_reloc_fn, /* special_function */
- "R_386_GNU_VTENTRY", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false) /* pcrel_offset */
- #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
- };
- #ifdef DEBUG_GEN_RELOC
- #define TRACE(str) \
- fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
- #else
- #define TRACE(str)
- #endif
- static reloc_howto_type *
- elf_i386_reloc_type_lookup (bfd *abfd,
- bfd_reloc_code_real_type code)
- {
- switch (code)
- {
- case BFD_RELOC_NONE:
- TRACE ("BFD_RELOC_NONE");
- return &elf_howto_table[R_386_NONE];
- case BFD_RELOC_32:
- TRACE ("BFD_RELOC_32");
- return &elf_howto_table[R_386_32];
- case BFD_RELOC_CTOR:
- TRACE ("BFD_RELOC_CTOR");
- return &elf_howto_table[R_386_32];
- case BFD_RELOC_32_PCREL:
- TRACE ("BFD_RELOC_PC32");
- return &elf_howto_table[R_386_PC32];
- case BFD_RELOC_386_GOT32:
- TRACE ("BFD_RELOC_386_GOT32");
- return &elf_howto_table[R_386_GOT32];
- case BFD_RELOC_386_PLT32:
- TRACE ("BFD_RELOC_386_PLT32");
- return &elf_howto_table[R_386_PLT32];
- case BFD_RELOC_386_COPY:
- TRACE ("BFD_RELOC_386_COPY");
- return &elf_howto_table[R_386_COPY];
- case BFD_RELOC_386_GLOB_DAT:
- TRACE ("BFD_RELOC_386_GLOB_DAT");
- return &elf_howto_table[R_386_GLOB_DAT];
- case BFD_RELOC_386_JUMP_SLOT:
- TRACE ("BFD_RELOC_386_JUMP_SLOT");
- return &elf_howto_table[R_386_JUMP_SLOT];
- case BFD_RELOC_386_RELATIVE:
- TRACE ("BFD_RELOC_386_RELATIVE");
- return &elf_howto_table[R_386_RELATIVE];
- case BFD_RELOC_386_GOTOFF:
- TRACE ("BFD_RELOC_386_GOTOFF");
- return &elf_howto_table[R_386_GOTOFF];
- case BFD_RELOC_386_GOTPC:
- TRACE ("BFD_RELOC_386_GOTPC");
- return &elf_howto_table[R_386_GOTPC];
- /* These relocs are a GNU extension. */
- case BFD_RELOC_386_TLS_TPOFF:
- TRACE ("BFD_RELOC_386_TLS_TPOFF");
- return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
- case BFD_RELOC_386_TLS_IE:
- TRACE ("BFD_RELOC_386_TLS_IE");
- return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
- case BFD_RELOC_386_TLS_GOTIE:
- TRACE ("BFD_RELOC_386_TLS_GOTIE");
- return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
- case BFD_RELOC_386_TLS_LE:
- TRACE ("BFD_RELOC_386_TLS_LE");
- return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
- case BFD_RELOC_386_TLS_GD:
- TRACE ("BFD_RELOC_386_TLS_GD");
- return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
- case BFD_RELOC_386_TLS_LDM:
- TRACE ("BFD_RELOC_386_TLS_LDM");
- return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
- case BFD_RELOC_16:
- TRACE ("BFD_RELOC_16");
- return &elf_howto_table[R_386_16 - R_386_ext_offset];
- case BFD_RELOC_16_PCREL:
- TRACE ("BFD_RELOC_16_PCREL");
- return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
- case BFD_RELOC_8:
- TRACE ("BFD_RELOC_8");
- return &elf_howto_table[R_386_8 - R_386_ext_offset];
- case BFD_RELOC_8_PCREL:
- TRACE ("BFD_RELOC_8_PCREL");
- return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
- /* Common with Sun TLS implementation. */
- case BFD_RELOC_386_TLS_LDO_32:
- TRACE ("BFD_RELOC_386_TLS_LDO_32");
- return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
- case BFD_RELOC_386_TLS_IE_32:
- TRACE ("BFD_RELOC_386_TLS_IE_32");
- return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
- case BFD_RELOC_386_TLS_LE_32:
- TRACE ("BFD_RELOC_386_TLS_LE_32");
- return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
- case BFD_RELOC_386_TLS_DTPMOD32:
- TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
- return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
- case BFD_RELOC_386_TLS_DTPOFF32:
- TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
- return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
- case BFD_RELOC_386_TLS_TPOFF32:
- TRACE ("BFD_RELOC_386_TLS_TPOFF32");
- return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
- case BFD_RELOC_SIZE32:
- TRACE ("BFD_RELOC_SIZE32");
- return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
- case BFD_RELOC_386_TLS_GOTDESC:
- TRACE ("BFD_RELOC_386_TLS_GOTDESC");
- return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
- case BFD_RELOC_386_TLS_DESC_CALL:
- TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
- return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
- case BFD_RELOC_386_TLS_DESC:
- TRACE ("BFD_RELOC_386_TLS_DESC");
- return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
- case BFD_RELOC_386_IRELATIVE:
- TRACE ("BFD_RELOC_386_IRELATIVE");
- return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
- case BFD_RELOC_386_GOT32X:
- TRACE ("BFD_RELOC_386_GOT32X");
- return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
- case BFD_RELOC_VTABLE_INHERIT:
- TRACE ("BFD_RELOC_VTABLE_INHERIT");
- return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
- case BFD_RELOC_VTABLE_ENTRY:
- TRACE ("BFD_RELOC_VTABLE_ENTRY");
- return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
- default:
- TRACE ("Unknown");
- /* xgettext:c-format */
- _bfd_error_handler (_("%pB: unsupported relocation type: %#x"),
- abfd, (int) code);
- bfd_set_error (bfd_error_bad_value);
- return NULL;
- }
- }
- static reloc_howto_type *
- elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
- const char *r_name)
- {
- unsigned int i;
- for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
- if (elf_howto_table[i].name != NULL
- && strcasecmp (elf_howto_table[i].name, r_name) == 0)
- return &elf_howto_table[i];
- return NULL;
- }
- static reloc_howto_type *
- elf_i386_rtype_to_howto (unsigned r_type)
- {
- unsigned int indx;
- if ((indx = r_type) >= R_386_standard
- && ((indx = r_type - R_386_ext_offset) - R_386_standard
- >= R_386_ext - R_386_standard)
- && ((indx = r_type - R_386_tls_offset) - R_386_ext
- >= R_386_ext2 - R_386_ext)
- && ((indx = r_type - R_386_vt_offset) - R_386_ext2
- >= R_386_vt - R_386_ext2))
- return NULL;
- /* PR 17512: file: 0f67f69d. */
- if (elf_howto_table [indx].type != r_type)
- return NULL;
- return &elf_howto_table[indx];
- }
- static bool
- elf_i386_info_to_howto_rel (bfd *abfd,
- arelent *cache_ptr,
- Elf_Internal_Rela *dst)
- {
- unsigned int r_type = ELF32_R_TYPE (dst->r_info);
- if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL)
- {
- /* xgettext:c-format */
- _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
- abfd, r_type);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- return true;
- }
- /* Return whether a symbol name implies a local label. The UnixWare
- 2.1 cc generates temporary symbols that start with .X, so we
- recognize them here. FIXME: do other SVR4 compilers also use .X?.
- If so, we should move the .X recognition into
- _bfd_elf_is_local_label_name. */
- static bool
- elf_i386_is_local_label_name (bfd *abfd, const char *name)
- {
- if (name[0] == '.' && name[1] == 'X')
- return true;
- return _bfd_elf_is_local_label_name (abfd, name);
- }
- /* Support for core dump NOTE sections. */
- static bool
- elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
- {
- int offset;
- size_t size;
- if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
- {
- int pr_version = bfd_get_32 (abfd, note->descdata);
- if (pr_version != 1)
- return false;
- /* pr_cursig */
- elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
- /* pr_pid */
- elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
- /* pr_reg */
- offset = 28;
- size = bfd_get_32 (abfd, note->descdata + 8);
- }
- else
- {
- switch (note->descsz)
- {
- default:
- return false;
- case 144: /* Linux/i386 */
- /* pr_cursig */
- elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
- /* pr_pid */
- elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
- /* pr_reg */
- offset = 72;
- size = 68;
- break;
- }
- }
- /* Make a ".reg/999" section. */
- return _bfd_elfcore_make_pseudosection (abfd, ".reg",
- size, note->descpos + offset);
- }
- static bool
- elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
- {
- if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
- {
- int pr_version = bfd_get_32 (abfd, note->descdata);
- if (pr_version != 1)
- return false;
- elf_tdata (abfd)->core->program
- = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
- elf_tdata (abfd)->core->command
- = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
- }
- else
- {
- switch (note->descsz)
- {
- default:
- return false;
- case 124: /* Linux/i386 elf_prpsinfo. */
- elf_tdata (abfd)->core->pid
- = bfd_get_32 (abfd, note->descdata + 12);
- elf_tdata (abfd)->core->program
- = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
- elf_tdata (abfd)->core->command
- = _bfd_elfcore_strndup (abfd, note->descdata + 44, 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 i386 ELF linker.
- In order to gain some understanding of code in this file without
- knowing all the intricate details of the linker, note the
- following:
- Functions named elf_i386_* are called by external routines, other
- functions are only called locally. elf_i386_* functions appear
- in this file more or less in the order in which they are called
- from external routines. eg. elf_i386_scan_relocs is called
- early in the link process, elf_i386_finish_dynamic_sections is
- one of the last functions. */
- /* The size in bytes of an entry in the lazy procedure linkage table. */
- #define LAZY_PLT_ENTRY_SIZE 16
- /* The size in bytes of an entry in the non-lazy procedure linkage
- table. */
- #define NON_LAZY_PLT_ENTRY_SIZE 8
- /* The first entry in an absolute lazy procedure linkage table looks
- like this. See the SVR4 ABI i386 supplement to see how this works.
- Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
- static const bfd_byte elf_i386_lazy_plt0_entry[12] =
- {
- 0xff, 0x35, /* pushl contents of address */
- 0, 0, 0, 0, /* replaced with address of .got + 4. */
- 0xff, 0x25, /* jmp indirect */
- 0, 0, 0, 0 /* replaced with address of .got + 8. */
- };
- /* Subsequent entries in an absolute lazy procedure linkage table look
- like this. */
- static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
- {
- 0xff, 0x25, /* jmp indirect */
- 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
- 0x68, /* pushl immediate */
- 0, 0, 0, 0, /* replaced with offset into relocation table. */
- 0xe9, /* jmp relative */
- 0, 0, 0, 0 /* replaced with offset to start of .plt. */
- };
- /* The first entry in a PIC lazy procedure linkage table look like
- this. Will be padded to LAZY_PLT_ENTRY_SIZE with
- lazy_plt->plt0_pad_byte. */
- static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
- {
- 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
- 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
- };
- /* Subsequent entries in a PIC lazy procedure linkage table look like
- this. */
- static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
- {
- 0xff, 0xa3, /* jmp *offset(%ebx) */
- 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
- 0x68, /* pushl immediate */
- 0, 0, 0, 0, /* replaced with offset into relocation table. */
- 0xe9, /* jmp relative */
- 0, 0, 0, 0 /* replaced with offset to start of .plt. */
- };
- /* Entries in the non-lazy procedure linkage table look like this. */
- static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
- {
- 0xff, 0x25, /* jmp indirect */
- 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
- 0x66, 0x90 /* xchg %ax,%ax */
- };
- /* Entries in the PIC non-lazy procedure linkage table look like
- this. */
- static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
- {
- 0xff, 0xa3, /* jmp *offset(%ebx) */
- 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
- 0x66, 0x90 /* xchg %ax,%ax */
- };
- /* The first entry in an absolute IBT-enabled lazy procedure linkage
- table looks like this. */
- static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
- {
- 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
- 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
- 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
- };
- /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
- table look like this. Subsequent entries for a PIC IBT-enabled lazy
- procedure linkage table are the same. */
- static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
- {
- 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
- 0x68, 0, 0, 0, 0, /* pushl immediate */
- 0xe9, 0, 0, 0, 0, /* jmp relative */
- 0x66, 0x90 /* xchg %ax,%ax */
- };
- /* The first entry in a PIC IBT-enabled lazy procedure linkage table
- look like. */
- static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
- {
- 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
- 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
- 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
- };
- /* Entries for branches with IBT-enabled in the absolute non-lazey
- procedure linkage table look like this. They have the same size
- as the lazy PLT entry. */
- static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
- {
- 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
- 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
- 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
- };
- /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
- linkage table look like this. They have the same size as the lazy
- PLT entry. */
- static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
- {
- 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
- 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
- 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
- };
- /* .eh_frame covering the lazy .plt section. */
- static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
- {
- PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
- 0, 0, 0, 0, /* CIE ID */
- 1, /* CIE version */
- 'z', 'R', 0, /* Augmentation string */
- 1, /* Code alignment factor */
- 0x7c, /* Data alignment factor */
- 8, /* Return address column */
- 1, /* Augmentation size */
- DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
- DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
- DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
- DW_CFA_nop, DW_CFA_nop,
- PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
- PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
- 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
- 0, 0, 0, 0, /* .plt size goes here */
- 0, /* Augmentation size */
- DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
- DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
- DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
- DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
- DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
- 11, /* Block length */
- DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
- DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
- DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
- DW_OP_lit2, DW_OP_shl, DW_OP_plus,
- DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
- };
- /* .eh_frame covering the lazy .plt section with IBT-enabled. */
- static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
- {
- PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
- 0, 0, 0, 0, /* CIE ID */
- 1, /* CIE version */
- 'z', 'R', 0, /* Augmentation string */
- 1, /* Code alignment factor */
- 0x7c, /* Data alignment factor */
- 8, /* Return address column */
- 1, /* Augmentation size */
- DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
- DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
- DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
- DW_CFA_nop, DW_CFA_nop,
- PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
- PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
- 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
- 0, 0, 0, 0, /* .plt size goes here */
- 0, /* Augmentation size */
- DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
- DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
- DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
- DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
- DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
- 11, /* Block length */
- DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
- DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
- DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
- DW_OP_lit2, DW_OP_shl, DW_OP_plus,
- DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
- };
- /* .eh_frame covering the non-lazy .plt section. */
- static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
- {
- #define PLT_GOT_FDE_LENGTH 16
- PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
- 0, 0, 0, 0, /* CIE ID */
- 1, /* CIE version */
- 'z', 'R', 0, /* Augmentation string */
- 1, /* Code alignment factor */
- 0x7c, /* Data alignment factor */
- 8, /* Return address column */
- 1, /* Augmentation size */
- DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
- DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
- DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
- DW_CFA_nop, DW_CFA_nop,
- PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
- PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
- 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
- 0, 0, 0, 0, /* non-lazy .plt size goes here */
- 0, /* Augmentation size */
- DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
- };
- /* These are the standard parameters. */
- static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
- {
- elf_i386_lazy_plt0_entry, /* plt0_entry */
- sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
- elf_i386_lazy_plt_entry, /* plt_entry */
- LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
- NULL, /* plt_tlsdesc_entry */
- 0, /* plt_tlsdesc_entry_size*/
- 0, /* plt_tlsdesc_got1_offset */
- 0, /* plt_tlsdesc_got2_offset */
- 0, /* plt_tlsdesc_got1_insn_end */
- 0, /* plt_tlsdesc_got2_insn_end */
- 2, /* plt0_got1_offset */
- 8, /* plt0_got2_offset */
- 0, /* plt0_got2_insn_end */
- 2, /* plt_got_offset */
- 7, /* plt_reloc_offset */
- 12, /* plt_plt_offset */
- 0, /* plt_got_insn_size */
- 0, /* plt_plt_insn_end */
- 6, /* plt_lazy_offset */
- elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
- elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
- elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
- sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
- };
- static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
- {
- elf_i386_non_lazy_plt_entry, /* plt_entry */
- elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
- NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
- 2, /* plt_got_offset */
- 0, /* plt_got_insn_size */
- elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
- sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
- };
- static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
- {
- elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
- sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
- elf_i386_lazy_ibt_plt_entry, /* plt_entry */
- LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
- NULL, /* plt_tlsdesc_entry */
- 0, /* plt_tlsdesc_entry_size*/
- 0, /* plt_tlsdesc_got1_offset */
- 0, /* plt_tlsdesc_got2_offset */
- 0, /* plt_tlsdesc_got1_insn_end */
- 0, /* plt_tlsdesc_got2_insn_end */
- 2, /* plt0_got1_offset */
- 8, /* plt0_got2_offset */
- 0, /* plt0_got2_insn_end */
- 4+2, /* plt_got_offset */
- 4+1, /* plt_reloc_offset */
- 4+6, /* plt_plt_offset */
- 0, /* plt_got_insn_size */
- 0, /* plt_plt_insn_end */
- 0, /* plt_lazy_offset */
- elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
- elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
- elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
- sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
- };
- static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
- {
- elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
- elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
- LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
- 4+2, /* plt_got_offset */
- 0, /* plt_got_insn_size */
- elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
- sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
- };
- /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
- for the PLTResolve stub and then for each PLT entry. */
- #define PLTRESOLVE_RELOCS_SHLIB 0
- #define PLTRESOLVE_RELOCS 2
- #define PLT_NON_JUMP_SLOT_RELOCS 2
- /* Return TRUE if the TLS access code sequence support transition
- from R_TYPE. */
- static bool
- elf_i386_check_tls_transition (asection *sec,
- bfd_byte *contents,
- Elf_Internal_Shdr *symtab_hdr,
- struct elf_link_hash_entry **sym_hashes,
- unsigned int r_type,
- const Elf_Internal_Rela *rel,
- const Elf_Internal_Rela *relend)
- {
- unsigned int val, type, reg;
- unsigned long r_symndx;
- struct elf_link_hash_entry *h;
- bfd_vma offset;
- bfd_byte *call;
- bool indirect_call;
- offset = rel->r_offset;
- switch (r_type)
- {
- case R_386_TLS_GD:
- case R_386_TLS_LDM:
- if (offset < 2 || (rel + 1) >= relend)
- return false;
- indirect_call = false;
- call = contents + offset + 4;
- val = *(call - 5);
- type = *(call - 6);
- if (r_type == R_386_TLS_GD)
- {
- /* Check transition from GD access model. Only
- leal foo@tlsgd(,%ebx,1), %eax
- call ___tls_get_addr@PLT
- or
- leal foo@tlsgd(%ebx) %eax
- call ___tls_get_addr@PLT
- nop
- or
- leal foo@tlsgd(%reg), %eax
- call *___tls_get_addr@GOT(%reg)
- which may be converted to
- addr32 call ___tls_get_addr
- can transit to different access model. */
- if ((offset + 10) > sec->size
- || (type != 0x8d && type != 0x04))
- return false;
- if (type == 0x04)
- {
- /* leal foo@tlsgd(,%ebx,1), %eax
- call ___tls_get_addr@PLT */
- if (offset < 3)
- return false;
- if (*(call - 7) != 0x8d
- || val != 0x1d
- || call[0] != 0xe8)
- return false;
- }
- else
- {
- /* This must be
- leal foo@tlsgd(%ebx), %eax
- call ___tls_get_addr@PLT
- nop
- or
- leal foo@tlsgd(%reg), %eax
- call *___tls_get_addr@GOT(%reg)
- which may be converted to
- addr32 call ___tls_get_addr
- %eax can't be used as the GOT base register since it
- is used to pass parameter to ___tls_get_addr. */
- reg = val & 7;
- if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
- return false;
- indirect_call = call[0] == 0xff;
- if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
- && !(call[0] == 0x67 && call[1] == 0xe8)
- && !(indirect_call
- && (call[1] & 0xf8) == 0x90
- && (call[1] & 0x7) == reg))
- return false;
- }
- }
- else
- {
- /* Check transition from LD access model. Only
- leal foo@tlsldm(%ebx), %eax
- call ___tls_get_addr@PLT
- or
- leal foo@tlsldm(%reg), %eax
- call *___tls_get_addr@GOT(%reg)
- which may be converted to
- addr32 call ___tls_get_addr
- can transit to different access model. */
- if (type != 0x8d || (offset + 9) > sec->size)
- return false;
- /* %eax can't be used as the GOT base register since it is
- used to pass parameter to ___tls_get_addr. */
- reg = val & 7;
- if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
- return false;
- indirect_call = call[0] == 0xff;
- if (!(reg == 3 && call[0] == 0xe8)
- && !(call[0] == 0x67 && call[1] == 0xe8)
- && !(indirect_call
- && (call[1] & 0xf8) == 0x90
- && (call[1] & 0x7) == reg))
- return false;
- }
- r_symndx = ELF32_R_SYM (rel[1].r_info);
- if (r_symndx < symtab_hdr->sh_info)
- return false;
- h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- if (h == NULL
- || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
- return false;
- else if (indirect_call)
- return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
- else
- return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
- || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
- case R_386_TLS_IE:
- /* Check transition from IE access model:
- movl foo@indntpoff(%rip), %eax
- movl foo@indntpoff(%rip), %reg
- addl foo@indntpoff(%rip), %reg
- */
- if (offset < 1 || (offset + 4) > sec->size)
- return false;
- /* Check "movl foo@tpoff(%rip), %eax" first. */
- val = bfd_get_8 (abfd, contents + offset - 1);
- if (val == 0xa1)
- return true;
- if (offset < 2)
- return false;
- /* Check movl|addl foo@tpoff(%rip), %reg. */
- type = bfd_get_8 (abfd, contents + offset - 2);
- return ((type == 0x8b || type == 0x03)
- && (val & 0xc7) == 0x05);
- case R_386_TLS_GOTIE:
- case R_386_TLS_IE_32:
- /* Check transition from {IE_32,GOTIE} access model:
- subl foo@{tpoff,gontoff}(%reg1), %reg2
- movl foo@{tpoff,gontoff}(%reg1), %reg2
- addl foo@{tpoff,gontoff}(%reg1), %reg2
- */
- if (offset < 2 || (offset + 4) > sec->size)
- return false;
- val = bfd_get_8 (abfd, contents + offset - 1);
- if ((val & 0xc0) != 0x80 || (val & 7) == 4)
- return false;
- type = bfd_get_8 (abfd, contents + offset - 2);
- return type == 0x8b || type == 0x2b || type == 0x03;
- case R_386_TLS_GOTDESC:
- /* Check transition from GDesc access model:
- leal x@tlsdesc(%ebx), %eax
- Make sure it's a leal adding ebx to a 32-bit offset
- into any register, although it's probably almost always
- going to be eax. */
- if (offset < 2 || (offset + 4) > sec->size)
- return false;
- if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
- return false;
- val = bfd_get_8 (abfd, contents + offset - 1);
- return (val & 0xc7) == 0x83;
- case R_386_TLS_DESC_CALL:
- /* Check transition from GDesc access model:
- call *x@tlsdesc(%eax)
- */
- if (offset + 2 <= sec->size)
- {
- /* Make sure that it's a call *x@tlsdesc(%eax). */
- call = contents + offset;
- return call[0] == 0xff && call[1] == 0x10;
- }
- return false;
- default:
- abort ();
- }
- }
- /* Return TRUE if the TLS access transition is OK or no transition
- will be performed. Update R_TYPE if there is a transition. */
- static bool
- elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
- asection *sec, bfd_byte *contents,
- Elf_Internal_Shdr *symtab_hdr,
- struct elf_link_hash_entry **sym_hashes,
- unsigned int *r_type, int tls_type,
- const Elf_Internal_Rela *rel,
- const Elf_Internal_Rela *relend,
- struct elf_link_hash_entry *h,
- unsigned long r_symndx,
- bool from_relocate_section)
- {
- unsigned int from_type = *r_type;
- unsigned int to_type = from_type;
- bool check = true;
- /* Skip TLS transition for functions. */
- if (h != NULL
- && (h->type == STT_FUNC
- || h->type == STT_GNU_IFUNC))
- return true;
- switch (from_type)
- {
- case R_386_TLS_GD:
- case R_386_TLS_GOTDESC:
- case R_386_TLS_DESC_CALL:
- case R_386_TLS_IE_32:
- case R_386_TLS_IE:
- case R_386_TLS_GOTIE:
- if (bfd_link_executable (info))
- {
- if (h == NULL)
- to_type = R_386_TLS_LE_32;
- else if (from_type != R_386_TLS_IE
- && from_type != R_386_TLS_GOTIE)
- to_type = R_386_TLS_IE_32;
- }
- /* When we are called from elf_i386_relocate_section, there may
- be additional transitions based on TLS_TYPE. */
- if (from_relocate_section)
- {
- unsigned int new_to_type = to_type;
- if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
- new_to_type = R_386_TLS_LE_32;
- if (to_type == R_386_TLS_GD
- || to_type == R_386_TLS_GOTDESC
- || to_type == R_386_TLS_DESC_CALL)
- {
- if (tls_type == GOT_TLS_IE_POS)
- new_to_type = R_386_TLS_GOTIE;
- else if (tls_type & GOT_TLS_IE)
- new_to_type = R_386_TLS_IE_32;
- }
- /* We checked the transition before when we were called from
- elf_i386_scan_relocs. We only want to check the new
- transition which hasn't been checked before. */
- check = new_to_type != to_type && from_type == to_type;
- to_type = new_to_type;
- }
- break;
- case R_386_TLS_LDM:
- if (bfd_link_executable (info))
- to_type = R_386_TLS_LE_32;
- break;
- default:
- return true;
- }
- /* Return TRUE if there is no transition. */
- if (from_type == to_type)
- return true;
- /* Check if the transition can be performed. */
- if (check
- && ! elf_i386_check_tls_transition (sec, contents,
- symtab_hdr, sym_hashes,
- from_type, rel, relend))
- {
- reloc_howto_type *from, *to;
- const char *name;
- from = elf_i386_rtype_to_howto (from_type);
- to = elf_i386_rtype_to_howto (to_type);
- if (h)
- name = h->root.root.string;
- else
- {
- struct elf_x86_link_hash_table *htab;
- htab = elf_x86_hash_table (info, I386_ELF_DATA);
- if (htab == NULL)
- name = "*unknown*";
- else
- {
- Elf_Internal_Sym *isym;
- isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
- abfd, r_symndx);
- name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
- }
- }
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: TLS transition from %s to %s against `%s'"
- " at %#" PRIx64 " in section `%pA' failed"),
- abfd, from->name, to->name, name,
- (uint64_t) rel->r_offset, sec);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- *r_type = to_type;
- return true;
- }
- /* With the local symbol, foo, we convert
- mov foo@GOT[(%reg1)], %reg2
- to
- lea foo[@GOTOFF(%reg1)], %reg2
- and convert
- call/jmp *foo@GOT[(%reg)]
- to
- nop call foo/jmp foo nop
- When PIC is false, convert
- test %reg1, foo@GOT[(%reg2)]
- to
- test $foo, %reg1
- and convert
- binop foo@GOT[(%reg1)], %reg2
- to
- binop $foo, %reg2
- where binop is one of adc, add, and, cmp, or, sbb, sub, xor
- instructions. */
- static
- bool
- elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
- bfd_byte *contents,
- unsigned int *r_type_p,
- Elf_Internal_Rela *irel,
- struct elf_link_hash_entry *h,
- bool *converted,
- struct bfd_link_info *link_info)
- {
- struct elf_x86_link_hash_table *htab;
- unsigned int opcode;
- unsigned int modrm;
- bool baseless;
- Elf_Internal_Sym *isym;
- unsigned int addend;
- unsigned int nop;
- bfd_vma nop_offset;
- bool is_pic;
- bool to_reloc_32;
- bool abs_symbol;
- unsigned int r_type;
- unsigned int r_symndx;
- bfd_vma roff = irel->r_offset;
- bool local_ref;
- struct elf_x86_link_hash_entry *eh;
- if (roff < 2)
- return true;
- /* Addend for R_386_GOT32X relocations must be 0. */
- addend = bfd_get_32 (abfd, contents + roff);
- if (addend != 0)
- return true;
- htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
- is_pic = bfd_link_pic (link_info);
- r_type = *r_type_p;
- r_symndx = ELF32_R_SYM (irel->r_info);
- modrm = bfd_get_8 (abfd, contents + roff - 1);
- baseless = (modrm & 0xc7) == 0x5;
- if (h)
- {
- /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
- local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
- isym = NULL;
- abs_symbol = ABS_SYMBOL_P (h);
- }
- else
- {
- local_ref = true;
- isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, abfd,
- r_symndx);
- abs_symbol = isym->st_shndx == SHN_ABS;
- }
- if (baseless && is_pic)
- {
- /* For PIC, disallow R_386_GOT32X without a base register
- since we don't know what the GOT base is. */
- const char *name;
- if (h == NULL)
- name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
- else
- name = h->root.root.string;
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
- " register can not be used when making a shared object"),
- abfd, name);
- return false;
- }
- opcode = bfd_get_8 (abfd, contents + roff - 2);
- /* Convert to R_386_32 if PIC is false or there is no base
- register. */
- to_reloc_32 = !is_pic || baseless;
- eh = elf_x86_hash_entry (h);
- /* Try to convert R_386_GOT32X. Get the symbol referred to by the
- reloc. */
- if (h == NULL)
- {
- if (opcode == 0x0ff)
- /* Convert "call/jmp *foo@GOT[(%reg)]". */
- goto convert_branch;
- else
- /* Convert "mov foo@GOT[(%reg1)], %reg2",
- "test %reg1, foo@GOT(%reg2)" and
- "binop foo@GOT[(%reg1)], %reg2". */
- goto convert_load;
- }
- /* Undefined weak symbol is only bound locally in executable
- and its reference is resolved as 0. */
- if (h->root.type == bfd_link_hash_undefweak
- && !eh->linker_def
- && local_ref)
- {
- if (opcode == 0xff)
- {
- /* No direct branch to 0 for PIC. */
- if (is_pic)
- return true;
- else
- goto convert_branch;
- }
- else
- {
- /* We can convert load of address 0 to R_386_32. */
- to_reloc_32 = true;
- goto convert_load;
- }
- }
- if (opcode == 0xff)
- {
- /* We have "call/jmp *foo@GOT[(%reg)]". */
- if ((h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- && local_ref)
- {
- /* The function is locally defined. */
- convert_branch:
- /* Convert R_386_GOT32X to R_386_PC32. */
- if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
- {
- /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
- is a nop prefix. */
- modrm = 0xe8;
- /* To support TLS optimization, always use addr32 prefix
- for "call *___tls_get_addr@GOT(%reg)". */
- if (eh && eh->tls_get_addr)
- {
- nop = 0x67;
- nop_offset = irel->r_offset - 2;
- }
- else
- {
- nop = htab->params->call_nop_byte;
- if (htab->params->call_nop_as_suffix)
- {
- nop_offset = roff + 3;
- irel->r_offset -= 1;
- }
- else
- nop_offset = roff - 2;
- }
- }
- else
- {
- /* Convert to "jmp foo nop". */
- modrm = 0xe9;
- nop = NOP_OPCODE;
- nop_offset = roff + 3;
- irel->r_offset -= 1;
- }
- bfd_put_8 (abfd, nop, contents + nop_offset);
- bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
- /* When converting to PC-relative relocation, we
- need to adjust addend by -4. */
- bfd_put_32 (abfd, -4, contents + irel->r_offset);
- irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
- *r_type_p = R_386_PC32;
- *converted = true;
- }
- }
- else
- {
- /* We have "mov foo@GOT[(%re1g)], %reg2",
- "test %reg1, foo@GOT(%reg2)" and
- "binop foo@GOT[(%reg1)], %reg2".
- Avoid optimizing _DYNAMIC since ld.so may use its
- link-time address. */
- if (h == htab->elf.hdynamic)
- return true;
- /* def_regular is set by an assignment in a linker script in
- bfd_elf_record_link_assignment. start_stop is set on
- __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
- if (h->start_stop
- || eh->linker_def
- || ((h->def_regular
- || h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- && local_ref))
- {
- convert_load:
- if (opcode == 0x8b)
- {
- if (abs_symbol && local_ref)
- to_reloc_32 = true;
- if (to_reloc_32)
- {
- /* Convert "mov foo@GOT[(%reg1)], %reg2" to
- "mov $foo, %reg2" with R_386_32. */
- r_type = R_386_32;
- modrm = 0xc0 | (modrm & 0x38) >> 3;
- bfd_put_8 (abfd, modrm, contents + roff - 1);
- opcode = 0xc7;
- }
- else
- {
- /* Convert "mov foo@GOT(%reg1), %reg2" to
- "lea foo@GOTOFF(%reg1), %reg2". */
- r_type = R_386_GOTOFF;
- opcode = 0x8d;
- }
- }
- else
- {
- /* Only R_386_32 is supported. */
- if (!to_reloc_32)
- return true;
- if (opcode == 0x85)
- {
- /* Convert "test %reg1, foo@GOT(%reg2)" to
- "test $foo, %reg1". */
- modrm = 0xc0 | (modrm & 0x38) >> 3;
- opcode = 0xf7;
- }
- else
- {
- /* Convert "binop foo@GOT(%reg1), %reg2" to
- "binop $foo, %reg2". */
- modrm = (0xc0
- | (modrm & 0x38) >> 3
- | (opcode & 0x3c));
- opcode = 0x81;
- }
- bfd_put_8 (abfd, modrm, contents + roff - 1);
- r_type = R_386_32;
- }
- bfd_put_8 (abfd, opcode, contents + roff - 2);
- irel->r_info = ELF32_R_INFO (r_symndx, r_type);
- *r_type_p = r_type;
- *converted = true;
- }
- }
- return true;
- }
- /* Look through the relocs for a section during the first phase, and
- calculate needed space in the global offset table, and procedure
- linkage table. */
- static bool
- elf_i386_scan_relocs (bfd *abfd,
- struct bfd_link_info *info,
- asection *sec,
- const Elf_Internal_Rela *relocs)
- {
- struct elf_x86_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;
- bfd_byte *contents;
- bool converted;
- if (bfd_link_relocatable (info))
- return true;
- htab = elf_x86_hash_table (info, I386_ELF_DATA);
- if (htab == NULL)
- {
- sec->check_relocs_failed = 1;
- return false;
- }
- BFD_ASSERT (is_x86_elf (abfd, htab));
- /* Get the section contents. */
- if (elf_section_data (sec)->this_hdr.contents != NULL)
- contents = elf_section_data (sec)->this_hdr.contents;
- else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
- {
- sec->check_relocs_failed = 1;
- return false;
- }
- symtab_hdr = &elf_symtab_hdr (abfd);
- sym_hashes = elf_sym_hashes (abfd);
- converted = false;
- rel_end = relocs + sec->reloc_count;
- for (rel = relocs; rel < rel_end; rel++)
- {
- unsigned int r_type;
- unsigned int r_symndx;
- struct elf_link_hash_entry *h;
- struct elf_x86_link_hash_entry *eh;
- Elf_Internal_Sym *isym;
- const char *name;
- bool size_reloc;
- bool no_dynreloc;
- r_symndx = ELF32_R_SYM (rel->r_info);
- r_type = ELF32_R_TYPE (rel->r_info);
- if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
- {
- /* xgettext:c-format */
- _bfd_error_handler (_("%pB: bad symbol index: %d"),
- abfd, r_symndx);
- goto error_return;
- }
- if (r_symndx < symtab_hdr->sh_info)
- {
- /* A local symbol. */
- isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
- abfd, r_symndx);
- if (isym == NULL)
- goto error_return;
- /* Check relocation against local STT_GNU_IFUNC symbol. */
- if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
- {
- h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, true);
- if (h == NULL)
- goto error_return;
- /* Fake a STT_GNU_IFUNC symbol. */
- h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
- isym, NULL);
- h->type = STT_GNU_IFUNC;
- h->def_regular = 1;
- h->ref_regular = 1;
- h->forced_local = 1;
- h->root.type = bfd_link_hash_defined;
- }
- else
- h = NULL;
- }
- else
- {
- isym = NULL;
- 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 elf_x86_link_hash_entry *) h;
- if (h != NULL)
- {
- if (r_type == R_386_GOTOFF)
- eh->gotoff_ref = 1;
- /* It is referenced by a non-shared object. */
- h->ref_regular = 1;
- }
- if (r_type == R_386_GOT32X
- && (h == NULL || h->type != STT_GNU_IFUNC))
- {
- Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
- if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
- &r_type, irel, h,
- &converted, info))
- goto error_return;
- }
- if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
- symtab_hdr, &no_dynreloc))
- return false;
- if (! elf_i386_tls_transition (info, abfd, sec, contents,
- symtab_hdr, sym_hashes,
- &r_type, GOT_UNKNOWN,
- rel, rel_end, h, r_symndx, false))
- goto error_return;
- /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
- if (h == htab->elf.hgot)
- htab->got_referenced = true;
- switch (r_type)
- {
- case R_386_TLS_LDM:
- htab->tls_ld_or_ldm_got.refcount = 1;
- goto create_got;
- case R_386_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;
- eh->zero_undefweak &= 0x2;
- h->needs_plt = 1;
- h->plt.refcount = 1;
- break;
- case R_386_SIZE32:
- size_reloc = true;
- goto do_size;
- case R_386_TLS_IE_32:
- case R_386_TLS_IE:
- case R_386_TLS_GOTIE:
- if (!bfd_link_executable (info))
- info->flags |= DF_STATIC_TLS;
- /* Fall through */
- case R_386_GOT32:
- case R_386_GOT32X:
- case R_386_TLS_GD:
- case R_386_TLS_GOTDESC:
- case R_386_TLS_DESC_CALL:
- /* This symbol requires a global offset table entry. */
- {
- int tls_type, old_tls_type;
- switch (r_type)
- {
- default:
- case R_386_GOT32:
- case R_386_GOT32X:
- tls_type = GOT_NORMAL;
- break;
- case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
- case R_386_TLS_GOTDESC:
- case R_386_TLS_DESC_CALL:
- tls_type = GOT_TLS_GDESC; break;
- case R_386_TLS_IE_32:
- if (ELF32_R_TYPE (rel->r_info) == r_type)
- tls_type = GOT_TLS_IE_NEG;
- else
- /* If this is a GD->IE transition, we may use either of
- R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
- tls_type = GOT_TLS_IE;
- break;
- case R_386_TLS_IE:
- case R_386_TLS_GOTIE:
- tls_type = GOT_TLS_IE_POS; break;
- }
- if (h != NULL)
- {
- h->got.refcount = 1;
- old_tls_type = elf_x86_hash_entry (h)->tls_type;
- }
- else
- {
- bfd_signed_vma *local_got_refcounts;
- if (!elf_x86_allocate_local_got_info (abfd,
- symtab_hdr->sh_info))
- goto error_return;
- /* This is a global offset table entry for a local symbol. */
- local_got_refcounts = elf_local_got_refcounts (abfd);
- local_got_refcounts[r_symndx] = 1;
- old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
- }
- if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
- tls_type |= old_tls_type;
- /* If a TLS symbol is accessed using IE at least once,
- there is no point to use dynamic model for it. */
- else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
- && (! GOT_TLS_GD_ANY_P (old_tls_type)
- || (tls_type & GOT_TLS_IE) == 0))
- {
- 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
- {
- if (h)
- name = h->root.root.string;
- else
- name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
- NULL);
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: `%s' accessed both as normal and "
- "thread local symbol"),
- abfd, name);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- }
- if (old_tls_type != tls_type)
- {
- if (h != NULL)
- elf_x86_hash_entry (h)->tls_type = tls_type;
- else
- elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
- }
- }
- /* Fall through */
- case R_386_GOTOFF:
- case R_386_GOTPC:
- create_got:
- if (r_type != R_386_TLS_IE)
- {
- if (eh != NULL)
- {
- eh->zero_undefweak &= 0x2;
- /* Need GOT to resolve undefined weak symbol to 0. */
- if (r_type == R_386_GOTOFF
- && h->root.type == bfd_link_hash_undefweak
- && bfd_link_executable (info))
- htab->got_referenced = true;
- }
- break;
- }
- /* Fall through */
- case R_386_TLS_LE_32:
- case R_386_TLS_LE:
- if (eh != NULL)
- eh->zero_undefweak &= 0x2;
- if (bfd_link_executable (info))
- break;
- info->flags |= DF_STATIC_TLS;
- goto do_relocation;
- case R_386_32:
- case R_386_PC32:
- if (eh != NULL && (sec->flags & SEC_CODE) != 0)
- eh->zero_undefweak |= 0x2;
- do_relocation:
- /* We are called after all symbols have been resolved. Only
- relocation against STT_GNU_IFUNC symbol must go through
- PLT. */
- if (h != NULL
- && (bfd_link_executable (info)
- || h->type == STT_GNU_IFUNC))
- {
- bool func_pointer_ref = false;
- if (r_type == R_386_PC32)
- {
- /* Since something like ".long foo - ." may be used
- as pointer, make sure that PLT is used if foo is
- a function defined in a shared library. */
- if ((sec->flags & SEC_CODE) == 0)
- h->pointer_equality_needed = 1;
- else if (h->type == STT_GNU_IFUNC
- && bfd_link_pic (info))
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
- abfd, h->root.root.string);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- }
- else
- {
- h->pointer_equality_needed = 1;
- /* R_386_32 can be resolved at run-time. */
- if (r_type == R_386_32
- && (sec->flags & SEC_READONLY) == 0)
- func_pointer_ref = true;
- }
- if (h->pointer_equality_needed
- && h->type == STT_FUNC
- && eh->def_protected
- && elf_has_indirect_extern_access (h->root.u.def.section->owner))
- {
- /* Disallow non-canonical reference to canonical
- protected function. */
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: non-canonical reference to canonical "
- "protected function `%s' in %pB"),
- abfd, h->root.root.string,
- h->root.u.def.section->owner);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- if (!func_pointer_ref)
- {
- /* 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;
- if (!elf_has_indirect_extern_access (sec->owner))
- eh->non_got_ref_without_indirect_extern_access = 1;
- /* We may need a .plt entry if the symbol is a function
- defined in a shared lib or is a function referenced
- from the code or read-only section. */
- if (!h->def_regular
- || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
- h->plt.refcount = 1;
- }
- }
- size_reloc = false;
- do_size:
- if (!no_dynreloc
- && NEED_DYNAMIC_RELOCATION_P (false, info, false, h, sec,
- r_type, R_386_32))
- {
- struct elf_dyn_relocs *p;
- struct elf_dyn_relocs **head;
- /* If this is a global symbol, we count the number of
- relocations we need for this symbol. */
- if (h != NULL)
- {
- head = &h->dyn_relocs;
- }
- else
- {
- /* Track dynamic relocs needed for local syms too.
- We really need local syms available to do this
- easily. Oh well. */
- void **vpp;
- asection *s;
- isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
- abfd, r_symndx);
- if (isym == NULL)
- goto error_return;
- s = bfd_section_from_elf_index (abfd, isym->st_shndx);
- if (s == NULL)
- s = sec;
- vpp = &elf_section_data (s)->local_dynrel;
- head = (struct elf_dyn_relocs **)vpp;
- }
- p = *head;
- if (p == NULL || p->sec != sec)
- {
- size_t amt = sizeof *p;
- p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
- amt);
- if (p == NULL)
- goto error_return;
- p->next = *head;
- *head = p;
- p->sec = sec;
- p->count = 0;
- p->pc_count = 0;
- }
- p->count += 1;
- /* Count size relocation as PC-relative relocation. */
- if (r_type == R_386_PC32 || size_reloc)
- p->pc_count += 1;
- }
- break;
- /* This relocation describes the C++ object vtable hierarchy.
- Reconstruct it for later use during GC. */
- case R_386_GNU_VTINHERIT:
- if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
- goto error_return;
- break;
- /* This relocation describes which C++ vtable entries are actually
- used. Record for later use during GC. */
- case R_386_GNU_VTENTRY:
- if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
- goto error_return;
- break;
- default:
- break;
- }
- }
- if (elf_section_data (sec)->this_hdr.contents != contents)
- {
- if (!converted && !_bfd_link_keep_memory (info))
- free (contents);
- else
- {
- /* Cache the section contents for elf_link_input_bfd if any
- load is converted or --no-keep-memory isn't used. */
- elf_section_data (sec)->this_hdr.contents = contents;
- info->cache_size += sec->size;
- }
- }
- /* Cache relocations if any load is converted. */
- if (elf_section_data (sec)->relocs != relocs && converted)
- elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
- return true;
- error_return:
- if (elf_section_data (sec)->this_hdr.contents != contents)
- free (contents);
- sec->check_relocs_failed = 1;
- return false;
- }
- static bool
- elf_i386_always_size_sections (bfd *output_bfd,
- struct bfd_link_info *info)
- {
- bfd *abfd;
- /* Scan relocations after rel_from_abs has been set on __ehdr_start. */
- for (abfd = info->input_bfds;
- abfd != (bfd *) NULL;
- abfd = abfd->link.next)
- if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
- && !_bfd_elf_link_iterate_on_relocs (abfd, info,
- elf_i386_scan_relocs))
- return false;
- return _bfd_x86_elf_always_size_sections (output_bfd, info);
- }
- /* Set the correct type for an x86 ELF section. We do this by the
- section name, which is a hack, but ought to work. */
- static bool
- elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
- Elf_Internal_Shdr *hdr,
- asection *sec)
- {
- const char *name;
- name = bfd_section_name (sec);
- /* This is an ugly, but unfortunately necessary hack that is
- needed when producing EFI binaries on x86. It tells
- elf.c:elf_fake_sections() not to consider ".reloc" as a section
- containing ELF relocation info. We need this hack in order to
- be able to generate ELF binaries that can be translated into
- EFI applications (which are essentially COFF objects). Those
- files contain a COFF ".reloc" section inside an ELFNN object,
- which would normally cause BFD to segfault because it would
- attempt to interpret this section as containing relocation
- entries for section "oc". With this hack enabled, ".reloc"
- will be treated as a normal data section, which will avoid the
- segfault. However, you won't be able to create an ELFNN binary
- with a section named "oc" that needs relocations, but that's
- the kind of ugly side-effects you get when detecting section
- types based on their names... In practice, this limitation is
- unlikely to bite. */
- if (strcmp (name, ".reloc") == 0)
- hdr->sh_type = SHT_PROGBITS;
- return true;
- }
- /* Return the relocation value for @tpoff relocation
- if STT_TLS virtual address is ADDRESS. */
- static bfd_vma
- elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
- {
- struct elf_link_hash_table *htab = elf_hash_table (info);
- const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
- bfd_vma static_tls_size;
- /* If tls_sec is NULL, we should have signalled an error already. */
- if (htab->tls_sec == NULL)
- return 0;
- /* Consider special static TLS alignment requirements. */
- static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
- return static_tls_size + htab->tls_sec->vma - address;
- }
- /* Relocate an i386 ELF section. */
- static int
- elf_i386_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 elf_x86_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 *wrel;
- Elf_Internal_Rela *relend;
- bool is_vxworks_tls;
- unsigned plt_entry_size;
- /* Skip if check_relocs or scan_relocs failed. */
- if (input_section->check_relocs_failed)
- return false;
- htab = elf_x86_hash_table (info, I386_ELF_DATA);
- if (htab == NULL)
- return false;
- if (!is_x86_elf (input_bfd, htab))
- {
- bfd_set_error (bfd_error_wrong_format);
- return false;
- }
- symtab_hdr = &elf_symtab_hdr (input_bfd);
- sym_hashes = elf_sym_hashes (input_bfd);
- local_got_offsets = elf_local_got_offsets (input_bfd);
- local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
- /* We have to handle relocations in vxworks .tls_vars sections
- specially, because the dynamic loader is 'weird'. */
- is_vxworks_tls = (htab->elf.target_os == is_vxworks
- && bfd_link_pic (info)
- && !strcmp (input_section->output_section->name,
- ".tls_vars"));
- _bfd_x86_elf_set_tls_module_base (info);
- plt_entry_size = htab->plt.plt_entry_size;
- rel = wrel = relocs;
- relend = relocs + input_section->reloc_count;
- for (; rel < relend; wrel++, rel++)
- {
- unsigned int r_type, r_type_tls;
- reloc_howto_type *howto;
- unsigned long r_symndx;
- struct elf_link_hash_entry *h;
- struct elf_x86_link_hash_entry *eh;
- Elf_Internal_Sym *sym;
- asection *sec;
- bfd_vma off, offplt, plt_offset;
- bfd_vma relocation;
- bool unresolved_reloc;
- bfd_reloc_status_type r;
- unsigned int indx;
- int tls_type;
- bfd_vma st_size;
- asection *resolved_plt;
- bool resolved_to_zero;
- bool relative_reloc;
- r_type = ELF32_R_TYPE (rel->r_info);
- if (r_type == R_386_GNU_VTINHERIT
- || r_type == R_386_GNU_VTENTRY)
- {
- if (wrel != rel)
- *wrel = *rel;
- continue;
- }
- howto = elf_i386_rtype_to_howto (r_type);
- if (howto == NULL)
- return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
- r_symndx = ELF32_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 = (sec->output_section->vma
- + sec->output_offset
- + sym->st_value);
- st_size = sym->st_size;
- if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
- && ((sec->flags & SEC_MERGE) != 0
- || (bfd_link_relocatable (info)
- && sec->output_offset != 0)))
- {
- bfd_vma addend;
- bfd_byte *where = contents + rel->r_offset;
- switch (howto->size)
- {
- case 0:
- addend = bfd_get_8 (input_bfd, where);
- if (howto->pc_relative)
- {
- addend = (addend ^ 0x80) - 0x80;
- addend += 1;
- }
- break;
- case 1:
- addend = bfd_get_16 (input_bfd, where);
- if (howto->pc_relative)
- {
- addend = (addend ^ 0x8000) - 0x8000;
- addend += 2;
- }
- break;
- case 2:
- addend = bfd_get_32 (input_bfd, where);
- if (howto->pc_relative)
- {
- addend = (addend ^ 0x80000000) - 0x80000000;
- addend += 4;
- }
- break;
- default:
- abort ();
- }
- if (bfd_link_relocatable (info))
- addend += sec->output_offset;
- else
- {
- asection *msec = sec;
- addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
- addend);
- addend -= relocation;
- addend += msec->output_section->vma + msec->output_offset;
- }
- switch (howto->size)
- {
- case 0:
- /* FIXME: overflow checks. */
- if (howto->pc_relative)
- addend -= 1;
- bfd_put_8 (input_bfd, addend, where);
- break;
- case 1:
- if (howto->pc_relative)
- addend -= 2;
- bfd_put_16 (input_bfd, addend, where);
- break;
- case 2:
- if (howto->pc_relative)
- addend -= 4;
- bfd_put_32 (input_bfd, addend, where);
- break;
- }
- }
- else if (!bfd_link_relocatable (info)
- && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
- {
- /* Relocate against local STT_GNU_IFUNC symbol. */
- h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
- false);
- if (h == NULL)
- abort ();
- /* Set STT_GNU_IFUNC symbol value. */
- h->root.u.def.value = sym->st_value;
- h->root.u.def.section = sec;
- }
- }
- else
- {
- bool warned ATTRIBUTE_UNUSED;
- bool ignored ATTRIBUTE_UNUSED;
- RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
- r_symndx, symtab_hdr, sym_hashes,
- h, sec, relocation,
- unresolved_reloc, warned, ignored);
- st_size = h->size;
- }
- if (sec != NULL && discarded_section (sec))
- {
- _bfd_clear_contents (howto, input_bfd, input_section,
- contents, rel->r_offset);
- wrel->r_offset = rel->r_offset;
- wrel->r_info = 0;
- wrel->r_addend = 0;
- /* For ld -r, remove relocations in debug sections against
- sections defined in discarded sections. Not done for
- eh_frame editing code expects to be present. */
- if (bfd_link_relocatable (info)
- && (input_section->flags & SEC_DEBUGGING))
- wrel--;
- continue;
- }
- if (bfd_link_relocatable (info))
- {
- if (wrel != rel)
- *wrel = *rel;
- continue;
- }
- eh = (struct elf_x86_link_hash_entry *) h;
- /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
- it here if it is defined in a non-shared object. */
- if (h != NULL
- && h->type == STT_GNU_IFUNC
- && h->def_regular)
- {
- asection *gotplt, *base_got;
- bfd_vma plt_index;
- const char *name;
- if ((input_section->flags & SEC_ALLOC) == 0)
- {
- /* If this is a SHT_NOTE section without SHF_ALLOC, treat
- STT_GNU_IFUNC symbol as STT_FUNC. */
- if (elf_section_type (input_section) == SHT_NOTE)
- goto skip_ifunc;
- /* 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 ((input_section->flags & SEC_DEBUGGING) != 0)
- continue;
- abort ();
- }
- /* STT_GNU_IFUNC symbol must go through PLT. */
- if (htab->elf.splt != NULL)
- {
- if (htab->plt_second != NULL)
- {
- resolved_plt = htab->plt_second;
- plt_offset = eh->plt_second.offset;
- }
- else
- {
- resolved_plt = htab->elf.splt;
- plt_offset = h->plt.offset;
- }
- gotplt = htab->elf.sgotplt;
- }
- else
- {
- resolved_plt = htab->elf.iplt;
- plt_offset = h->plt.offset;
- gotplt = htab->elf.igotplt;
- }
- switch (r_type)
- {
- default:
- break;
- case R_386_GOT32:
- case R_386_GOT32X:
- base_got = htab->elf.sgot;
- off = h->got.offset;
- if (base_got == NULL)
- abort ();
- if (off == (bfd_vma) -1)
- {
- /* We can't use h->got.offset here to save state, or
- even just remember the offset, as finish_dynamic_symbol
- would use that as offset into .got. */
- if (h->plt.offset == (bfd_vma) -1)
- abort ();
- if (htab->elf.splt != NULL)
- {
- plt_index = (h->plt.offset / plt_entry_size
- - htab->plt.has_plt0);
- off = (plt_index + 3) * 4;
- base_got = htab->elf.sgotplt;
- }
- else
- {
- plt_index = h->plt.offset / plt_entry_size;
- off = plt_index * 4;
- base_got = htab->elf.igotplt;
- }
- if (h->dynindx == -1
- || h->forced_local
- || info->symbolic)
- {
- /* This references the local defitionion. We must
- initialize this entry in the global offset table.
- Since the offset must always be a multiple of 4,
- 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_32 (output_bfd, relocation,
- base_got->contents + off);
- h->got.offset |= 1;
- }
- }
- relocation = off;
- }
- else
- relocation = (base_got->output_section->vma
- + base_got->output_offset + off
- - gotplt->output_section->vma
- - gotplt->output_offset);
- if (rel->r_offset > 1
- && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
- && *(contents + rel->r_offset - 2) != 0x8d)
- {
- if (bfd_link_pic (info))
- goto disallow_got32;
- /* Add the GOT base if there is no base register. */
- relocation += (gotplt->output_section->vma
- + gotplt->output_offset);
- }
- else if (htab->elf.splt == NULL)
- {
- /* Adjust for static executables. */
- relocation += gotplt->output_offset;
- }
- goto do_relocation;
- }
- if (h->plt.offset == (bfd_vma) -1)
- {
- /* Handle static pointers of STT_GNU_IFUNC symbols. */
- if (r_type == R_386_32
- && (input_section->flags & SEC_CODE) == 0)
- goto do_ifunc_pointer;
- goto bad_ifunc_reloc;
- }
- relocation = (resolved_plt->output_section->vma
- + resolved_plt->output_offset + plt_offset);
- switch (r_type)
- {
- default:
- bad_ifunc_reloc:
- if (h->root.root.string)
- name = h->root.root.string;
- else
- name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
- NULL);
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: relocation %s against STT_GNU_IFUNC "
- "symbol `%s' isn't supported"), input_bfd,
- howto->name, name);
- bfd_set_error (bfd_error_bad_value);
- return false;
- case R_386_32:
- /* Generate dynamic relcoation only when there is a
- non-GOT reference in a shared object. */
- if ((bfd_link_pic (info) && h->non_got_ref)
- || h->plt.offset == (bfd_vma) -1)
- {
- Elf_Internal_Rela outrel;
- asection *sreloc;
- bfd_vma offset;
- do_ifunc_pointer:
- /* Need a dynamic relocation to get the real function
- adddress. */
- offset = _bfd_elf_section_offset (output_bfd,
- info,
- input_section,
- rel->r_offset);
- if (offset == (bfd_vma) -1
- || offset == (bfd_vma) -2)
- abort ();
- outrel.r_offset = (input_section->output_section->vma
- + input_section->output_offset
- + offset);
- if (POINTER_LOCAL_IFUNC_P (info, h))
- {
- info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
- h->root.root.string,
- h->root.u.def.section->owner);
- /* This symbol is resolved locally. */
- outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
- if (htab->params->report_relative_reloc)
- _bfd_x86_elf_link_report_relative_reloc
- (info, input_section, h, sym,
- "R_386_IRELATIVE", &outrel);
- bfd_put_32 (output_bfd,
- (h->root.u.def.value
- + h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset),
- contents + offset);
- }
- else
- outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
- /* Dynamic relocations are stored in
- 1. .rel.ifunc section in PIC object.
- 2. .rel.got section in dynamic executable.
- 3. .rel.iplt section in static executable. */
- if (bfd_link_pic (info))
- sreloc = htab->elf.irelifunc;
- else if (htab->elf.splt != NULL)
- sreloc = htab->elf.srelgot;
- else
- sreloc = htab->elf.irelplt;
- elf_append_rel (output_bfd, sreloc, &outrel);
- /* 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. For an
- internal symbol, we have updated addend. */
- continue;
- }
- /* FALLTHROUGH */
- case R_386_PC32:
- case R_386_PLT32:
- goto do_relocation;
- case R_386_GOTOFF:
- relocation -= (gotplt->output_section->vma
- + gotplt->output_offset);
- goto do_relocation;
- }
- }
- skip_ifunc:
- resolved_to_zero = (eh != NULL
- && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
- switch (r_type)
- {
- case R_386_GOT32X:
- case R_386_GOT32:
- /* Relocation is to the entry for this symbol in the global
- offset table. */
- if (htab->elf.sgot == NULL)
- abort ();
- relative_reloc = false;
- if (h != NULL)
- {
- off = h->got.offset;
- if (RESOLVED_LOCALLY_P (info, h, htab))
- {
- /* We must initialize this entry in the global offset
- table. Since the offset must always be a multiple
- of 4, we use the least significant bit to record
- whether we have initialized it already.
- When doing a dynamic link, we create a .rel.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_32 (output_bfd, relocation,
- htab->elf.sgot->contents + off);
- h->got.offset |= 1;
- /* NB: Don't generate relative relocation here if
- it has been generated by DT_RELR. */
- if (!info->enable_dt_relr
- && GENERATE_RELATIVE_RELOC_P (info, h))
- {
- /* PR ld/21402: If this symbol isn't dynamic
- in PIC, generate R_386_RELATIVE here. */
- eh->no_finish_dynamic_symbol = 1;
- relative_reloc = true;
- }
- }
- }
- 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 4. 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_32 (output_bfd, relocation,
- htab->elf.sgot->contents + off);
- local_got_offsets[r_symndx] |= 1;
- /* NB: Don't generate relative relocation here if it
- has been generated by DT_RELR. */
- if (!info->enable_dt_relr && bfd_link_pic (info))
- relative_reloc = true;
- }
- }
- if (relative_reloc)
- {
- asection *s;
- Elf_Internal_Rela outrel;
- s = htab->elf.srelgot;
- if (s == NULL)
- abort ();
- outrel.r_offset = (htab->elf.sgot->output_section->vma
- + htab->elf.sgot->output_offset
- + off);
- outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
- if (htab->params->report_relative_reloc)
- _bfd_x86_elf_link_report_relative_reloc
- (info, input_section, h, sym, "R_386_RELATIVE",
- &outrel);
- elf_append_rel (output_bfd, s, &outrel);
- }
- if (off >= (bfd_vma) -2)
- abort ();
- relocation = (htab->elf.sgot->output_section->vma
- + htab->elf.sgot->output_offset + off);
- if (rel->r_offset > 1
- && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
- && *(contents + rel->r_offset - 2) != 0x8d)
- {
- if (bfd_link_pic (info))
- {
- /* For PIC, disallow R_386_GOT32 without a base
- register, except for "lea foo@GOT, %reg", since
- we don't know what the GOT base is. */
- const char *name;
- disallow_got32:
- if (h == NULL || h->root.root.string == NULL)
- name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
- NULL);
- else
- name = h->root.root.string;
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: direct GOT relocation %s against `%s'"
- " without base register can not be used"
- " when making a shared object"),
- input_bfd, howto->name, name);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- }
- else
- {
- /* Subtract the .got.plt section address only with a base
- register. */
- relocation -= (htab->elf.sgotplt->output_section->vma
- + htab->elf.sgotplt->output_offset);
- }
- break;
- case R_386_GOTOFF:
- /* Relocation is relative to the start of the global offset
- table. */
- /* Check to make sure it isn't a protected function or data
- symbol for shared library since it may not be local when
- used as function address or with copy relocation. We also
- need to make sure that a symbol is referenced locally. */
- if (!bfd_link_executable (info) && h)
- {
- if (!h->def_regular)
- {
- const char *v;
- switch (ELF_ST_VISIBILITY (h->other))
- {
- case STV_HIDDEN:
- v = _("hidden symbol");
- break;
- case STV_INTERNAL:
- v = _("internal symbol");
- break;
- case STV_PROTECTED:
- v = _("protected symbol");
- break;
- default:
- v = _("symbol");
- break;
- }
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: relocation R_386_GOTOFF against undefined %s"
- " `%s' can not be used when making a shared object"),
- input_bfd, v, h->root.root.string);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
- && (h->type == STT_FUNC
- || h->type == STT_OBJECT)
- && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: relocation R_386_GOTOFF against protected %s"
- " `%s' can not be used when making a shared object"),
- input_bfd,
- h->type == STT_FUNC ? "function" : "data",
- 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->elf.sgotplt->output_section->vma
- + htab->elf.sgotplt->output_offset;
- break;
- case R_386_GOTPC:
- /* Use global offset table as symbol value. */
- relocation = htab->elf.sgotplt->output_section->vma
- + htab->elf.sgotplt->output_offset;
- unresolved_reloc = false;
- break;
- case R_386_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
- && eh->plt_got.offset == (bfd_vma) -1)
- || htab->elf.splt == NULL)
- {
- /* We didn't make a PLT entry for this symbol. This
- happens when statically linking PIC code, or when
- using -Bsymbolic. */
- break;
- }
- if (h->plt.offset != (bfd_vma) -1)
- {
- if (htab->plt_second != NULL)
- {
- resolved_plt = htab->plt_second;
- plt_offset = eh->plt_second.offset;
- }
- else
- {
- resolved_plt = htab->elf.splt;
- plt_offset = h->plt.offset;
- }
- }
- else
- {
- resolved_plt = htab->plt_got;
- plt_offset = eh->plt_got.offset;
- }
- relocation = (resolved_plt->output_section->vma
- + resolved_plt->output_offset
- + plt_offset);
- unresolved_reloc = false;
- break;
- case R_386_SIZE32:
- /* Set to symbol size. */
- relocation = st_size;
- /* Fall through. */
- case R_386_32:
- case R_386_PC32:
- if ((input_section->flags & SEC_ALLOC) == 0
- || is_vxworks_tls)
- break;
- if (GENERATE_DYNAMIC_RELOCATION_P (false, info, eh, r_type,
- sec, false,
- resolved_to_zero,
- (r_type == R_386_PC32)))
- {
- Elf_Internal_Rela outrel;
- bool skip, relocate;
- bool generate_dynamic_reloc = true;
- 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);
- else if (COPY_INPUT_RELOC_P (false, info, h, r_type))
- outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
- else
- {
- /* This symbol is local, or marked to become local. */
- relocate = true;
- /* NB: Don't generate relative relocation here if it
- has been generated by DT_RELR. */
- if (info->enable_dt_relr)
- generate_dynamic_reloc = false;
- else
- {
- outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
- if (htab->params->report_relative_reloc)
- _bfd_x86_elf_link_report_relative_reloc
- (info, input_section, h, sym, "R_386_RELATIVE",
- &outrel);
- }
- }
- if (generate_dynamic_reloc)
- {
- sreloc = elf_section_data (input_section)->sreloc;
- if (sreloc == NULL || sreloc->contents == NULL)
- {
- r = bfd_reloc_notsupported;
- goto check_relocation_error;
- }
- elf_append_rel (output_bfd, sreloc, &outrel);
- }
- /* 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_386_TLS_IE:
- if (!bfd_link_executable (info))
- {
- Elf_Internal_Rela outrel;
- asection *sreloc;
- outrel.r_offset = rel->r_offset
- + input_section->output_section->vma
- + input_section->output_offset;
- outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
- if (htab->params->report_relative_reloc)
- _bfd_x86_elf_link_report_relative_reloc
- (info, input_section, h, sym, "R_386_RELATIVE",
- &outrel);
- sreloc = elf_section_data (input_section)->sreloc;
- if (sreloc == NULL)
- abort ();
- elf_append_rel (output_bfd, sreloc, &outrel);
- }
- /* Fall through */
- case R_386_TLS_GD:
- case R_386_TLS_GOTDESC:
- case R_386_TLS_DESC_CALL:
- case R_386_TLS_IE_32:
- case R_386_TLS_GOTIE:
- tls_type = GOT_UNKNOWN;
- if (h == NULL && local_got_offsets)
- tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
- else if (h != NULL)
- tls_type = elf_x86_hash_entry(h)->tls_type;
- if (tls_type == GOT_TLS_IE)
- tls_type = GOT_TLS_IE_NEG;
- r_type_tls = r_type;
- if (! elf_i386_tls_transition (info, input_bfd,
- input_section, contents,
- symtab_hdr, sym_hashes,
- &r_type_tls, tls_type, rel,
- relend, h, r_symndx, true))
- return false;
- if (r_type_tls == R_386_TLS_LE_32)
- {
- BFD_ASSERT (! unresolved_reloc);
- if (r_type == R_386_TLS_GD)
- {
- unsigned int type;
- bfd_vma roff;
- /* GD->LE transition. */
- type = *(contents + rel->r_offset - 2);
- if (type == 0x04)
- {
- /* Change
- leal foo@tlsgd(,%ebx,1), %eax
- call ___tls_get_addr@PLT
- into:
- movl %gs:0, %eax
- subl $foo@tpoff, %eax
- (6 byte form of subl). */
- roff = rel->r_offset + 5;
- }
- else
- {
- /* Change
- leal foo@tlsgd(%ebx), %eax
- call ___tls_get_addr@PLT
- nop
- or
- leal foo@tlsgd(%reg), %eax
- call *___tls_get_addr@GOT(%reg)
- which may be converted to
- addr32 call ___tls_get_addr
- into:
- movl %gs:0, %eax; subl $foo@tpoff, %eax
- (6 byte form of subl). */
- roff = rel->r_offset + 6;
- }
- memcpy (contents + roff - 8,
- "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
- bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
- contents + roff);
- /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
- rel++;
- wrel++;
- continue;
- }
- else if (r_type == R_386_TLS_GOTDESC)
- {
- /* GDesc -> LE transition.
- It's originally something like:
- leal x@tlsdesc(%ebx), %eax
- leal x@ntpoff, %eax
- Registers other than %eax may be set up here. */
- unsigned int val;
- bfd_vma roff;
- roff = rel->r_offset;
- val = bfd_get_8 (input_bfd, contents + roff - 1);
- /* Now modify the instruction as appropriate. */
- /* aoliva FIXME: remove the above and xor the byte
- below with 0x86. */
- bfd_put_8 (output_bfd, val ^ 0x86,
- contents + roff - 1);
- bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
- contents + roff);
- continue;
- }
- else if (r_type == R_386_TLS_DESC_CALL)
- {
- /* GDesc -> LE transition.
- It's originally:
- call *(%eax)
- Turn it into:
- xchg %ax,%ax */
- bfd_vma roff;
- roff = rel->r_offset;
- bfd_put_8 (output_bfd, 0x66, contents + roff);
- bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
- continue;
- }
- else if (r_type == R_386_TLS_IE)
- {
- unsigned int val;
- /* IE->LE transition:
- Originally it can be one of:
- movl foo, %eax
- movl foo, %reg
- addl foo, %reg
- We change it into:
- movl $foo, %eax
- movl $foo, %reg
- addl $foo, %reg. */
- val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
- if (val == 0xa1)
- {
- /* movl foo, %eax. */
- bfd_put_8 (output_bfd, 0xb8,
- contents + rel->r_offset - 1);
- }
- else
- {
- unsigned int type;
- type = bfd_get_8 (input_bfd,
- contents + rel->r_offset - 2);
- switch (type)
- {
- case 0x8b:
- /* movl */
- bfd_put_8 (output_bfd, 0xc7,
- contents + rel->r_offset - 2);
- bfd_put_8 (output_bfd,
- 0xc0 | ((val >> 3) & 7),
- contents + rel->r_offset - 1);
- break;
- case 0x03:
- /* addl */
- bfd_put_8 (output_bfd, 0x81,
- contents + rel->r_offset - 2);
- bfd_put_8 (output_bfd,
- 0xc0 | ((val >> 3) & 7),
- contents + rel->r_offset - 1);
- break;
- default:
- BFD_FAIL ();
- break;
- }
- }
- bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
- contents + rel->r_offset);
- continue;
- }
- else
- {
- unsigned int val, type;
- /* {IE_32,GOTIE}->LE transition:
- Originally it can be one of:
- subl foo(%reg1), %reg2
- movl foo(%reg1), %reg2
- addl foo(%reg1), %reg2
- We change it into:
- subl $foo, %reg2
- movl $foo, %reg2 (6 byte form)
- addl $foo, %reg2. */
- type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
- val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
- if (type == 0x8b)
- {
- /* movl */
- bfd_put_8 (output_bfd, 0xc7,
- contents + rel->r_offset - 2);
- bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
- contents + rel->r_offset - 1);
- }
- else if (type == 0x2b)
- {
- /* subl */
- bfd_put_8 (output_bfd, 0x81,
- contents + rel->r_offset - 2);
- bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
- contents + rel->r_offset - 1);
- }
- else if (type == 0x03)
- {
- /* addl */
- bfd_put_8 (output_bfd, 0x81,
- contents + rel->r_offset - 2);
- bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
- contents + rel->r_offset - 1);
- }
- else
- BFD_FAIL ();
- if (r_type == R_386_TLS_GOTIE)
- bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
- contents + rel->r_offset);
- else
- bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
- contents + rel->r_offset);
- continue;
- }
- }
- if (htab->elf.sgot == NULL)
- abort ();
- if (h != NULL)
- {
- off = h->got.offset;
- offplt = elf_x86_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;
- int dr_type;
- asection *sreloc;
- if (htab->elf.srelgot == NULL)
- abort ();
- indx = h && h->dynindx != -1 ? h->dynindx : 0;
- if (GOT_TLS_GDESC_P (tls_type))
- {
- bfd_byte *loc;
- outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
- BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
- <= htab->elf.sgotplt->size);
- outrel.r_offset = (htab->elf.sgotplt->output_section->vma
- + htab->elf.sgotplt->output_offset
- + offplt
- + htab->sgotplt_jump_table_size);
- sreloc = htab->elf.srelplt;
- loc = sreloc->contents;
- loc += (htab->next_tls_desc_index++
- * sizeof (Elf32_External_Rel));
- BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
- <= sreloc->contents + sreloc->size);
- bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
- if (indx == 0)
- {
- BFD_ASSERT (! unresolved_reloc);
- bfd_put_32 (output_bfd,
- relocation - _bfd_x86_elf_dtpoff_base (info),
- htab->elf.sgotplt->contents + offplt
- + htab->sgotplt_jump_table_size + 4);
- }
- else
- {
- bfd_put_32 (output_bfd, 0,
- htab->elf.sgotplt->contents + offplt
- + htab->sgotplt_jump_table_size + 4);
- }
- }
- sreloc = htab->elf.srelgot;
- outrel.r_offset = (htab->elf.sgot->output_section->vma
- + htab->elf.sgot->output_offset + off);
- if (GOT_TLS_GD_P (tls_type))
- dr_type = R_386_TLS_DTPMOD32;
- else if (GOT_TLS_GDESC_P (tls_type))
- goto dr_done;
- else if (tls_type == GOT_TLS_IE_POS)
- dr_type = R_386_TLS_TPOFF;
- else
- dr_type = R_386_TLS_TPOFF32;
- if (dr_type == R_386_TLS_TPOFF && indx == 0)
- bfd_put_32 (output_bfd,
- relocation - _bfd_x86_elf_dtpoff_base (info),
- htab->elf.sgot->contents + off);
- else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
- bfd_put_32 (output_bfd,
- _bfd_x86_elf_dtpoff_base (info) - relocation,
- htab->elf.sgot->contents + off);
- else if (dr_type != R_386_TLS_DESC)
- bfd_put_32 (output_bfd, 0,
- htab->elf.sgot->contents + off);
- outrel.r_info = ELF32_R_INFO (indx, dr_type);
- elf_append_rel (output_bfd, sreloc, &outrel);
- if (GOT_TLS_GD_P (tls_type))
- {
- if (indx == 0)
- {
- BFD_ASSERT (! unresolved_reloc);
- bfd_put_32 (output_bfd,
- relocation - _bfd_x86_elf_dtpoff_base (info),
- htab->elf.sgot->contents + off + 4);
- }
- else
- {
- bfd_put_32 (output_bfd, 0,
- htab->elf.sgot->contents + off + 4);
- outrel.r_info = ELF32_R_INFO (indx,
- R_386_TLS_DTPOFF32);
- outrel.r_offset += 4;
- elf_append_rel (output_bfd, sreloc, &outrel);
- }
- }
- else if (tls_type == GOT_TLS_IE_BOTH)
- {
- bfd_put_32 (output_bfd,
- (indx == 0
- ? relocation - _bfd_x86_elf_dtpoff_base (info)
- : 0),
- htab->elf.sgot->contents + off + 4);
- outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
- outrel.r_offset += 4;
- elf_append_rel (output_bfd, sreloc, &outrel);
- }
- 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_tls == R_386_TLS_GOTDESC
- || r_type_tls == R_386_TLS_DESC_CALL)
- {
- relocation = htab->sgotplt_jump_table_size + offplt;
- unresolved_reloc = false;
- }
- else if (r_type_tls == r_type)
- {
- bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
- + htab->elf.sgotplt->output_offset;
- relocation = htab->elf.sgot->output_section->vma
- + htab->elf.sgot->output_offset + off - g_o_t;
- if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
- && tls_type == GOT_TLS_IE_BOTH)
- relocation += 4;
- if (r_type == R_386_TLS_IE)
- relocation += g_o_t;
- unresolved_reloc = false;
- }
- else if (r_type == R_386_TLS_GD)
- {
- unsigned int val, type;
- bfd_vma roff;
- /* GD->IE transition. */
- type = *(contents + rel->r_offset - 2);
- val = *(contents + rel->r_offset - 1);
- if (type == 0x04)
- {
- /* Change
- leal foo@tlsgd(,%ebx,1), %eax
- call ___tls_get_addr@PLT
- into:
- movl %gs:0, %eax
- subl $foo@gottpoff(%ebx), %eax. */
- val >>= 3;
- roff = rel->r_offset - 3;
- }
- else
- {
- /* Change
- leal foo@tlsgd(%ebx), %eax
- call ___tls_get_addr@PLT
- nop
- or
- leal foo@tlsgd(%reg), %eax
- call *___tls_get_addr@GOT(%reg)
- which may be converted to
- addr32 call ___tls_get_addr
- into:
- movl %gs:0, %eax;
- subl $foo@gottpoff(%reg), %eax. */
- roff = rel->r_offset - 2;
- }
- memcpy (contents + roff,
- "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
- contents[roff + 7] = 0x80 | (val & 7);
- /* If foo is used only with foo@gotntpoff(%reg) and
- foo@indntpoff, but not with foo@gottpoff(%reg), change
- subl $foo@gottpoff(%reg), %eax
- into:
- addl $foo@gotntpoff(%reg), %eax. */
- if (tls_type == GOT_TLS_IE_POS)
- contents[roff + 6] = 0x03;
- bfd_put_32 (output_bfd,
- htab->elf.sgot->output_section->vma
- + htab->elf.sgot->output_offset + off
- - htab->elf.sgotplt->output_section->vma
- - htab->elf.sgotplt->output_offset,
- contents + roff + 8);
- /* Skip R_386_PLT32 and R_386_GOT32X. */
- rel++;
- wrel++;
- continue;
- }
- else if (r_type == R_386_TLS_GOTDESC)
- {
- /* GDesc -> IE transition.
- It's originally something like:
- leal x@tlsdesc(%ebx), %eax
- Change it to:
- movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
- or:
- movl x@gottpoff(%ebx), %eax # before negl %eax
- Registers other than %eax may be set up here. */
- bfd_vma roff;
- /* First, make sure it's a leal adding ebx to a 32-bit
- offset into any register, although it's probably
- almost always going to be eax. */
- roff = rel->r_offset;
- /* Now modify the instruction as appropriate. */
- /* To turn a leal into a movl in the form we use it, it
- suffices to change the first byte from 0x8d to 0x8b.
- aoliva FIXME: should we decide to keep the leal, all
- we have to do is remove the statement below, and
- adjust the relaxation of R_386_TLS_DESC_CALL. */
- bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
- if (tls_type == GOT_TLS_IE_BOTH)
- off += 4;
- bfd_put_32 (output_bfd,
- htab->elf.sgot->output_section->vma
- + htab->elf.sgot->output_offset + off
- - htab->elf.sgotplt->output_section->vma
- - htab->elf.sgotplt->output_offset,
- contents + roff);
- continue;
- }
- else if (r_type == R_386_TLS_DESC_CALL)
- {
- /* GDesc -> IE transition.
- It's originally:
- call *(%eax)
- Change it to:
- xchg %ax,%ax
- or
- negl %eax
- depending on how we transformed the TLS_GOTDESC above.
- */
- bfd_vma roff;
- roff = rel->r_offset;
- /* Now modify the instruction as appropriate. */
- if (tls_type != GOT_TLS_IE_NEG)
- {
- /* xchg %ax,%ax */
- bfd_put_8 (output_bfd, 0x66, contents + roff);
- bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
- }
- else
- {
- /* negl %eax */
- bfd_put_8 (output_bfd, 0xf7, contents + roff);
- bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
- }
- continue;
- }
- else
- BFD_ASSERT (false);
- break;
- case R_386_TLS_LDM:
- if (! elf_i386_tls_transition (info, input_bfd,
- input_section, contents,
- symtab_hdr, sym_hashes,
- &r_type, GOT_UNKNOWN, rel,
- relend, h, r_symndx, true))
- return false;
- if (r_type != R_386_TLS_LDM)
- {
- /* LD->LE transition. Change
- leal foo@tlsldm(%ebx) %eax
- call ___tls_get_addr@PLT
- into:
- movl %gs:0, %eax
- nop
- leal 0(%esi,1), %esi
- or change
- leal foo@tlsldm(%reg) %eax
- call *___tls_get_addr@GOT(%reg)
- which may be converted to
- addr32 call ___tls_get_addr
- into:
- movl %gs:0, %eax
- leal 0(%esi), %esi */
- BFD_ASSERT (r_type == R_386_TLS_LE_32);
- if (*(contents + rel->r_offset + 4) == 0xff
- || *(contents + rel->r_offset + 4) == 0x67)
- memcpy (contents + rel->r_offset - 2,
- "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
- else
- memcpy (contents + rel->r_offset - 2,
- "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
- /* Skip R_386_PC32/R_386_PLT32. */
- rel++;
- wrel++;
- continue;
- }
- if (htab->elf.sgot == NULL)
- abort ();
- off = htab->tls_ld_or_ldm_got.offset;
- if (off & 1)
- off &= ~1;
- else
- {
- Elf_Internal_Rela outrel;
- if (htab->elf.srelgot == NULL)
- abort ();
- outrel.r_offset = (htab->elf.sgot->output_section->vma
- + htab->elf.sgot->output_offset + off);
- bfd_put_32 (output_bfd, 0,
- htab->elf.sgot->contents + off);
- bfd_put_32 (output_bfd, 0,
- htab->elf.sgot->contents + off + 4);
- outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
- elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
- htab->tls_ld_or_ldm_got.offset |= 1;
- }
- relocation = htab->elf.sgot->output_section->vma
- + htab->elf.sgot->output_offset + off
- - htab->elf.sgotplt->output_section->vma
- - htab->elf.sgotplt->output_offset;
- unresolved_reloc = false;
- break;
- case R_386_TLS_LDO_32:
- if (!bfd_link_executable (info)
- || (input_section->flags & SEC_CODE) == 0)
- relocation -= _bfd_x86_elf_dtpoff_base (info);
- else
- /* When converting LDO to LE, we must negate. */
- relocation = -elf_i386_tpoff (info, relocation);
- break;
- case R_386_TLS_LE_32:
- case R_386_TLS_LE:
- if (!bfd_link_executable (info))
- {
- Elf_Internal_Rela outrel;
- asection *sreloc;
- outrel.r_offset = rel->r_offset
- + input_section->output_section->vma
- + input_section->output_offset;
- if (h != NULL && h->dynindx != -1)
- indx = h->dynindx;
- else
- indx = 0;
- if (r_type == R_386_TLS_LE_32)
- outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
- else
- outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
- sreloc = elf_section_data (input_section)->sreloc;
- if (sreloc == NULL)
- abort ();
- elf_append_rel (output_bfd, sreloc, &outrel);
- if (indx)
- continue;
- else if (r_type == R_386_TLS_LE_32)
- relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
- else
- relocation -= _bfd_x86_elf_dtpoff_base (info);
- }
- else if (r_type == R_386_TLS_LE_32)
- relocation = elf_i386_tpoff (info, relocation);
- else
- relocation = -elf_i386_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_elf_section_offset (output_bfd, info, input_section,
- rel->r_offset) != (bfd_vma) -1)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
- input_bfd,
- input_section,
- (uint64_t) rel->r_offset,
- howto->name,
- h->root.root.string);
- return false;
- }
- do_relocation:
- r = _bfd_final_link_relocate (howto, input_bfd, input_section,
- contents, rel->r_offset,
- relocation, 0);
- check_relocation_error:
- 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 (sec);
- }
- if (r == bfd_reloc_overflow)
- (*info->callbacks->reloc_overflow)
- (info, (h ? &h->root : NULL), name, howto->name,
- (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
- else
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
- input_bfd, input_section,
- (uint64_t) rel->r_offset, name, (int) r);
- return false;
- }
- }
- if (wrel != rel)
- *wrel = *rel;
- }
- if (wrel != rel)
- {
- Elf_Internal_Shdr *rel_hdr;
- size_t deleted = rel - wrel;
- rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
- rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
- if (rel_hdr->sh_size == 0)
- {
- /* It is too late to remove an empty reloc section. Leave
- one NONE reloc.
- ??? What is wrong with an empty section??? */
- rel_hdr->sh_size = rel_hdr->sh_entsize;
- deleted -= 1;
- }
- rel_hdr = _bfd_elf_single_rel_hdr (input_section);
- rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
- input_section->reloc_count -= deleted;
- }
- return true;
- }
- /* Finish up dynamic symbol handling. We set the contents of various
- dynamic sections here. */
- static bool
- elf_i386_finish_dynamic_symbol (bfd *output_bfd,
- struct bfd_link_info *info,
- struct elf_link_hash_entry *h,
- Elf_Internal_Sym *sym)
- {
- struct elf_x86_link_hash_table *htab;
- unsigned plt_entry_size;
- struct elf_x86_link_hash_entry *eh;
- bool local_undefweak;
- bool use_plt_second;
- htab = elf_x86_hash_table (info, I386_ELF_DATA);
- if (htab == NULL)
- return false;
- plt_entry_size = htab->plt.plt_entry_size;
- /* Use the second PLT section only if there is .plt section. */
- use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
- eh = (struct elf_x86_link_hash_entry *) h;
- if (eh->no_finish_dynamic_symbol)
- abort ();
- /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
- resolved undefined weak symbols in executable so that their
- references have value 0 at run-time. */
- local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
- if (h->plt.offset != (bfd_vma) -1)
- {
- bfd_vma plt_index, plt_offset;
- bfd_vma got_offset;
- Elf_Internal_Rela rel;
- bfd_byte *loc;
- asection *plt, *resolved_plt, *gotplt, *relplt;
- /* When building a static executable, use .iplt, .igot.plt and
- .rel.iplt sections for STT_GNU_IFUNC symbols. */
- if (htab->elf.splt != NULL)
- {
- plt = htab->elf.splt;
- gotplt = htab->elf.sgotplt;
- relplt = htab->elf.srelplt;
- }
- else
- {
- plt = htab->elf.iplt;
- gotplt = htab->elf.igotplt;
- relplt = htab->elf.irelplt;
- }
- VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
- /* 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.
- Get the offset into the .got table of the entry that
- corresponds to this function. Each .got entry is 4 bytes.
- The first three are reserved.
- For static executables, we don't reserve anything. */
- if (plt == htab->elf.splt)
- {
- got_offset = (h->plt.offset / plt_entry_size
- - htab->plt.has_plt0);
- got_offset = (got_offset + 3) * 4;
- }
- else
- {
- got_offset = h->plt.offset / plt_entry_size;
- got_offset = got_offset * 4;
- }
- /* Fill in the entry in the procedure linkage table and update
- the first slot. */
- memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
- plt_entry_size);
- if (use_plt_second)
- {
- const bfd_byte *plt_entry;
- if (bfd_link_pic (info))
- plt_entry = htab->non_lazy_plt->pic_plt_entry;
- else
- plt_entry = htab->non_lazy_plt->plt_entry;
- memcpy (htab->plt_second->contents + eh->plt_second.offset,
- plt_entry, htab->non_lazy_plt->plt_entry_size);
- resolved_plt = htab->plt_second;
- plt_offset = eh->plt_second.offset;
- }
- else
- {
- resolved_plt = plt;
- plt_offset = h->plt.offset;
- }
- if (! bfd_link_pic (info))
- {
- bfd_put_32 (output_bfd,
- (gotplt->output_section->vma
- + gotplt->output_offset
- + got_offset),
- resolved_plt->contents + plt_offset
- + htab->plt.plt_got_offset);
- if (htab->elf.target_os == is_vxworks)
- {
- int s, k, reloc_index;
- /* Create the R_386_32 relocation referencing the GOT
- for this PLT entry. */
- /* S: Current slot number (zero-based). */
- s = ((h->plt.offset - htab->plt.plt_entry_size)
- / htab->plt.plt_entry_size);
- /* K: Number of relocations for PLTResolve. */
- if (bfd_link_pic (info))
- k = PLTRESOLVE_RELOCS_SHLIB;
- else
- k = PLTRESOLVE_RELOCS;
- /* Skip the PLTresolve relocations, and the relocations for
- the other PLT slots. */
- reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
- loc = (htab->srelplt2->contents + reloc_index
- * sizeof (Elf32_External_Rel));
- rel.r_offset = (plt->output_section->vma
- + plt->output_offset
- + h->plt.offset + 2),
- rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
- bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
- /* Create the R_386_32 relocation referencing the beginning of
- the PLT for this GOT entry. */
- rel.r_offset = (htab->elf.sgotplt->output_section->vma
- + htab->elf.sgotplt->output_offset
- + got_offset);
- rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
- bfd_elf32_swap_reloc_out (output_bfd, &rel,
- loc + sizeof (Elf32_External_Rel));
- }
- }
- else
- {
- bfd_put_32 (output_bfd, got_offset,
- resolved_plt->contents + plt_offset
- + htab->plt.plt_got_offset);
- }
- /* Fill in the entry in the global offset table. Leave the entry
- as zero for undefined weak symbol in PIE. No PLT relocation
- against undefined weak symbol in PIE. */
- if (!local_undefweak)
- {
- if (htab->plt.has_plt0)
- bfd_put_32 (output_bfd,
- (plt->output_section->vma
- + plt->output_offset
- + h->plt.offset
- + htab->lazy_plt->plt_lazy_offset),
- gotplt->contents + got_offset);
- /* Fill in the entry in the .rel.plt section. */
- rel.r_offset = (gotplt->output_section->vma
- + gotplt->output_offset
- + got_offset);
- if (PLT_LOCAL_IFUNC_P (info, h))
- {
- info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
- h->root.root.string,
- h->root.u.def.section->owner);
- /* If an STT_GNU_IFUNC symbol is locally defined, generate
- R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
- in the .got.plt section. */
- bfd_put_32 (output_bfd,
- (h->root.u.def.value
- + h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset),
- gotplt->contents + got_offset);
- rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
- if (htab->params->report_relative_reloc)
- _bfd_x86_elf_link_report_relative_reloc
- (info, relplt, h, sym, "R_386_IRELATIVE", &rel);
- /* R_386_IRELATIVE comes last. */
- plt_index = htab->next_irelative_index--;
- }
- else
- {
- rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
- plt_index = htab->next_jump_slot_index++;
- }
- loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
- bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
- /* Don't fill the second and third slots in PLT entry for
- static executables nor without PLT0. */
- if (plt == htab->elf.splt && htab->plt.has_plt0)
- {
- bfd_put_32 (output_bfd,
- plt_index * sizeof (Elf32_External_Rel),
- plt->contents + h->plt.offset
- + htab->lazy_plt->plt_reloc_offset);
- bfd_put_32 (output_bfd,
- - (h->plt.offset
- + htab->lazy_plt->plt_plt_offset + 4),
- (plt->contents + h->plt.offset
- + htab->lazy_plt->plt_plt_offset));
- }
- }
- }
- else if (eh->plt_got.offset != (bfd_vma) -1)
- {
- bfd_vma got_offset, plt_offset;
- asection *plt, *got, *gotplt;
- const bfd_byte *got_plt_entry;
- /* Set the entry in the GOT procedure linkage table. */
- plt = htab->plt_got;
- got = htab->elf.sgot;
- gotplt = htab->elf.sgotplt;
- got_offset = h->got.offset;
- if (got_offset == (bfd_vma) -1
- || plt == NULL
- || got == NULL
- || gotplt == NULL)
- abort ();
- /* Fill in the entry in the GOT procedure linkage table. */
- if (! bfd_link_pic (info))
- {
- got_plt_entry = htab->non_lazy_plt->plt_entry;
- got_offset += got->output_section->vma + got->output_offset;
- }
- else
- {
- got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
- got_offset += (got->output_section->vma
- + got->output_offset
- - gotplt->output_section->vma
- - gotplt->output_offset);
- }
- plt_offset = eh->plt_got.offset;
- memcpy (plt->contents + plt_offset, got_plt_entry,
- htab->non_lazy_plt->plt_entry_size);
- bfd_put_32 (output_bfd, got_offset,
- (plt->contents + plt_offset
- + htab->non_lazy_plt->plt_got_offset));
- }
- if (!local_undefweak
- && !h->def_regular
- && (h->plt.offset != (bfd_vma) -1
- || eh->plt_got.offset != (bfd_vma) -1))
- {
- /* 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;
- }
- _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
- /* Don't generate dynamic GOT relocation against undefined weak
- symbol in executable. */
- if (h->got.offset != (bfd_vma) -1
- && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
- && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
- && !local_undefweak)
- {
- Elf_Internal_Rela rel;
- asection *relgot = htab->elf.srelgot;
- const char *relative_reloc_name = NULL;
- bool generate_dynamic_reloc = true;
- /* This symbol has an entry in the global offset table. Set it
- up. */
- if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
- abort ();
- rel.r_offset = (htab->elf.sgot->output_section->vma
- + htab->elf.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 (h->def_regular
- && h->type == STT_GNU_IFUNC)
- {
- if (h->plt.offset == (bfd_vma) -1)
- {
- /* STT_GNU_IFUNC is referenced without PLT. */
- if (htab->elf.splt == NULL)
- {
- /* use .rel[a].iplt section to store .got relocations
- in static executable. */
- relgot = htab->elf.irelplt;
- }
- if (SYMBOL_REFERENCES_LOCAL_P (info, h))
- {
- info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
- h->root.root.string,
- h->root.u.def.section->owner);
- bfd_put_32 (output_bfd,
- (h->root.u.def.value
- + h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset),
- htab->elf.sgot->contents + h->got.offset);
- rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
- relative_reloc_name = "R_386_IRELATIVE";
- }
- else
- goto do_glob_dat;
- }
- else if (bfd_link_pic (info))
- {
- /* Generate R_386_GLOB_DAT. */
- goto do_glob_dat;
- }
- else
- {
- asection *plt;
- bfd_vma plt_offset;
- if (!h->pointer_equality_needed)
- abort ();
- /* For non-shared object, we can't use .got.plt, which
- contains the real function addres if we need pointer
- equality. We load the GOT entry with the PLT entry. */
- if (htab->plt_second != NULL)
- {
- plt = htab->plt_second;
- plt_offset = eh->plt_second.offset;
- }
- else
- {
- plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
- plt_offset = h->plt.offset;
- }
- bfd_put_32 (output_bfd,
- (plt->output_section->vma
- + plt->output_offset + plt_offset),
- htab->elf.sgot->contents + h->got.offset);
- return true;
- }
- }
- else if (bfd_link_pic (info)
- && SYMBOL_REFERENCES_LOCAL_P (info, h))
- {
- BFD_ASSERT((h->got.offset & 1) != 0);
- if (info->enable_dt_relr)
- generate_dynamic_reloc = false;
- else
- {
- rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
- relative_reloc_name = "R_386_RELATIVE";
- }
- }
- else
- {
- BFD_ASSERT((h->got.offset & 1) == 0);
- do_glob_dat:
- bfd_put_32 (output_bfd, (bfd_vma) 0,
- htab->elf.sgot->contents + h->got.offset);
- rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
- }
- if (generate_dynamic_reloc)
- {
- if (relative_reloc_name != NULL
- && htab->params->report_relative_reloc)
- _bfd_x86_elf_link_report_relative_reloc
- (info, relgot, h, sym, relative_reloc_name, &rel);
- elf_append_rel (output_bfd, relgot, &rel);
- }
- }
- if (h->needs_copy)
- {
- Elf_Internal_Rela rel;
- asection *s;
- /* This symbol needs a copy reloc. Set it up. */
- VERIFY_COPY_RELOC (h, htab)
- rel.r_offset = (h->root.u.def.value
- + h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset);
- rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
- if (h->root.u.def.section == htab->elf.sdynrelro)
- s = htab->elf.sreldynrelro;
- else
- s = htab->elf.srelbss;
- elf_append_rel (output_bfd, s, &rel);
- }
- return true;
- }
- /* Finish up local dynamic symbol handling. We set the contents of
- various dynamic sections here. */
- static int
- elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
- {
- struct elf_link_hash_entry *h
- = (struct elf_link_hash_entry *) *slot;
- struct bfd_link_info *info
- = (struct bfd_link_info *) inf;
- return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
- h, NULL);
- }
- /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
- here since undefined weak symbol may not be dynamic and may not be
- called for elf_i386_finish_dynamic_symbol. */
- static bool
- elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
- void *inf)
- {
- struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
- struct bfd_link_info *info = (struct bfd_link_info *) inf;
- if (h->root.type != bfd_link_hash_undefweak
- || h->dynindx != -1)
- return true;
- return elf_i386_finish_dynamic_symbol (info->output_bfd,
- info, h, NULL);
- }
- /* 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
- elf_i386_reloc_type_class (const struct bfd_link_info *info,
- const asection *rel_sec ATTRIBUTE_UNUSED,
- const Elf_Internal_Rela *rela)
- {
- bfd *abfd = info->output_bfd;
- const struct elf_backend_data *bed = get_elf_backend_data (abfd);
- struct elf_link_hash_table *htab = elf_hash_table (info);
- if (htab->dynsym != NULL
- && htab->dynsym->contents != NULL)
- {
- /* Check relocation against STT_GNU_IFUNC symbol if there are
- dynamic symbols. */
- unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
- if (r_symndx != STN_UNDEF)
- {
- Elf_Internal_Sym sym;
- if (!bed->s->swap_symbol_in (abfd,
- (htab->dynsym->contents
- + r_symndx * sizeof (Elf32_External_Sym)),
- 0, &sym))
- abort ();
- if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
- return reloc_class_ifunc;
- }
- }
- switch (ELF32_R_TYPE (rela->r_info))
- {
- case R_386_IRELATIVE:
- return reloc_class_ifunc;
- case R_386_RELATIVE:
- return reloc_class_relative;
- case R_386_JUMP_SLOT:
- return reloc_class_plt;
- case R_386_COPY:
- return reloc_class_copy;
- default:
- return reloc_class_normal;
- }
- }
- /* Finish up the dynamic sections. */
- static bool
- elf_i386_finish_dynamic_sections (bfd *output_bfd,
- struct bfd_link_info *info)
- {
- struct elf_x86_link_hash_table *htab;
- htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
- if (htab == NULL)
- return false;
- if (!htab->elf.dynamic_sections_created)
- return true;
- if (htab->elf.splt && htab->elf.splt->size > 0)
- {
- if (bfd_is_abs_section (htab->elf.splt->output_section))
- {
- info->callbacks->einfo
- (_("%F%P: discarded output section: `%pA'\n"),
- htab->elf.splt);
- return false;
- }
- /* UnixWare sets the entsize of .plt to 4, although that doesn't
- really seem like the right value. */
- elf_section_data (htab->elf.splt->output_section)
- ->this_hdr.sh_entsize = 4;
- if (htab->plt.has_plt0)
- {
- /* Fill in the special first entry in the procedure linkage
- table. */
- memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
- htab->lazy_plt->plt0_entry_size);
- memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
- htab->plt0_pad_byte,
- htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
- if (!bfd_link_pic (info))
- {
- bfd_put_32 (output_bfd,
- (htab->elf.sgotplt->output_section->vma
- + htab->elf.sgotplt->output_offset
- + 4),
- htab->elf.splt->contents
- + htab->lazy_plt->plt0_got1_offset);
- bfd_put_32 (output_bfd,
- (htab->elf.sgotplt->output_section->vma
- + htab->elf.sgotplt->output_offset
- + 8),
- htab->elf.splt->contents
- + htab->lazy_plt->plt0_got2_offset);
- if (htab->elf.target_os == is_vxworks)
- {
- Elf_Internal_Rela rel;
- int num_plts = (htab->elf.splt->size
- / htab->plt.plt_entry_size) - 1;
- unsigned char *p;
- asection *srelplt2 = htab->srelplt2;
- /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
- + 4. On IA32 we use REL relocations so the
- addend goes in the PLT directly. */
- rel.r_offset = (htab->elf.splt->output_section->vma
- + htab->elf.splt->output_offset
- + htab->lazy_plt->plt0_got1_offset);
- rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
- R_386_32);
- bfd_elf32_swap_reloc_out (output_bfd, &rel,
- srelplt2->contents);
- /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
- + 8. */
- rel.r_offset = (htab->elf.splt->output_section->vma
- + htab->elf.splt->output_offset
- + htab->lazy_plt->plt0_got2_offset);
- rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
- R_386_32);
- bfd_elf32_swap_reloc_out (output_bfd, &rel,
- srelplt2->contents +
- sizeof (Elf32_External_Rel));
- /* Correct the .rel.plt.unloaded relocations. */
- p = srelplt2->contents;
- if (bfd_link_pic (info))
- p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
- else
- p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
- for (; num_plts; num_plts--)
- {
- bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
- rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
- R_386_32);
- bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
- p += sizeof (Elf32_External_Rel);
- bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
- rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
- R_386_32);
- bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
- p += sizeof (Elf32_External_Rel);
- }
- }
- }
- }
- }
- /* Fill PLT entries for undefined weak symbols in PIE. */
- if (bfd_link_pie (info))
- bfd_hash_traverse (&info->hash->table,
- elf_i386_pie_finish_undefweak_symbol,
- info);
- return true;
- }
- /* Fill PLT/GOT entries and allocate dynamic relocations for local
- STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
- It has to be done before elf_link_sort_relocs is called so that
- dynamic relocations are properly sorted. */
- static bool
- elf_i386_output_arch_local_syms
- (bfd *output_bfd ATTRIBUTE_UNUSED,
- struct bfd_link_info *info,
- void *flaginfo ATTRIBUTE_UNUSED,
- int (*func) (void *, const char *,
- Elf_Internal_Sym *,
- asection *,
- struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
- {
- struct elf_x86_link_hash_table *htab
- = elf_x86_hash_table (info, I386_ELF_DATA);
- if (htab == NULL)
- return false;
- /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
- htab_traverse (htab->loc_hash_table,
- elf_i386_finish_local_dynamic_symbol,
- info);
- return true;
- }
- /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
- dynamic relocations. */
- static long
- elf_i386_get_synthetic_symtab (bfd *abfd,
- long symcount ATTRIBUTE_UNUSED,
- asymbol **syms ATTRIBUTE_UNUSED,
- long dynsymcount,
- asymbol **dynsyms,
- asymbol **ret)
- {
- long count, i, n;
- int j;
- bfd_byte *plt_contents;
- long relsize;
- const struct elf_x86_lazy_plt_layout *lazy_plt;
- const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
- const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
- const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
- asection *plt;
- bfd_vma got_addr;
- enum elf_x86_plt_type plt_type;
- struct elf_x86_plt plts[] =
- {
- { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
- { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
- { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
- { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
- };
- *ret = NULL;
- if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
- return 0;
- if (dynsymcount <= 0)
- return 0;
- relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
- if (relsize <= 0)
- return -1;
- non_lazy_plt = NULL;
- /* Silence GCC 6. */
- lazy_plt = NULL;
- non_lazy_ibt_plt = NULL;
- lazy_ibt_plt = NULL;
- switch (get_elf_backend_data (abfd)->target_os)
- {
- case is_normal:
- case is_solaris:
- non_lazy_plt = &elf_i386_non_lazy_plt;
- lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
- non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
- /* Fall through */
- case is_vxworks:
- lazy_plt = &elf_i386_lazy_plt;
- break;
- default:
- abort ();
- }
- got_addr = 0;
- count = 0;
- for (j = 0; plts[j].name != NULL; j++)
- {
- plt = bfd_get_section_by_name (abfd, plts[j].name);
- if (plt == NULL || plt->size == 0)
- continue;
- /* Get the PLT section contents. */
- plt_contents = (bfd_byte *) bfd_malloc (plt->size);
- if (plt_contents == NULL)
- break;
- if (!bfd_get_section_contents (abfd, (asection *) plt,
- plt_contents, 0, plt->size))
- {
- free (plt_contents);
- break;
- }
- /* Check what kind of PLT it is. */
- plt_type = plt_unknown;
- if (plts[j].type == plt_unknown
- && (plt->size >= (lazy_plt->plt0_entry_size
- + lazy_plt->plt_entry_size)))
- {
- /* Match lazy PLT first. */
- if (memcmp (plt_contents, lazy_plt->plt0_entry,
- lazy_plt->plt0_got1_offset) == 0)
- {
- /* The fist entry in the lazy IBT PLT is the same as the
- normal lazy PLT. */
- if (lazy_ibt_plt != NULL
- && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
- lazy_ibt_plt->plt_entry,
- lazy_ibt_plt->plt_got_offset) == 0))
- plt_type = plt_lazy | plt_second;
- else
- plt_type = plt_lazy;
- }
- else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
- lazy_plt->plt0_got1_offset) == 0)
- {
- /* The fist entry in the PIC lazy IBT PLT is the same as
- the normal PIC lazy PLT. */
- if (lazy_ibt_plt != NULL
- && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
- lazy_ibt_plt->pic_plt_entry,
- lazy_ibt_plt->plt_got_offset) == 0))
- plt_type = plt_lazy | plt_pic | plt_second;
- else
- plt_type = plt_lazy | plt_pic;
- }
- }
- if (non_lazy_plt != NULL
- && (plt_type == plt_unknown || plt_type == plt_non_lazy)
- && plt->size >= non_lazy_plt->plt_entry_size)
- {
- /* Match non-lazy PLT. */
- if (memcmp (plt_contents, non_lazy_plt->plt_entry,
- non_lazy_plt->plt_got_offset) == 0)
- plt_type = plt_non_lazy;
- else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
- non_lazy_plt->plt_got_offset) == 0)
- plt_type = plt_pic;
- }
- if ((non_lazy_ibt_plt != NULL)
- && (plt_type == plt_unknown || plt_type == plt_second)
- && plt->size >= non_lazy_ibt_plt->plt_entry_size)
- {
- if (memcmp (plt_contents,
- non_lazy_ibt_plt->plt_entry,
- non_lazy_ibt_plt->plt_got_offset) == 0)
- {
- /* Match IBT PLT. */
- plt_type = plt_second;
- non_lazy_plt = non_lazy_ibt_plt;
- }
- else if (memcmp (plt_contents,
- non_lazy_ibt_plt->pic_plt_entry,
- non_lazy_ibt_plt->plt_got_offset) == 0)
- {
- /* Match PIC IBT PLT. */
- plt_type = plt_second | plt_pic;
- non_lazy_plt = non_lazy_ibt_plt;
- }
- }
- if (plt_type == plt_unknown)
- {
- free (plt_contents);
- continue;
- }
- plts[j].sec = plt;
- plts[j].type = plt_type;
- if ((plt_type & plt_lazy))
- {
- plts[j].plt_got_offset = lazy_plt->plt_got_offset;
- plts[j].plt_entry_size = lazy_plt->plt_entry_size;
- /* Skip PLT0 in lazy PLT. */
- i = 1;
- }
- else
- {
- plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
- plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
- i = 0;
- }
- /* Skip lazy PLT when the second PLT is used. */
- if ((plt_type & (plt_lazy | plt_second))
- == (plt_lazy | plt_second))
- plts[j].count = 0;
- else
- {
- n = plt->size / plts[j].plt_entry_size;
- plts[j].count = n;
- count += n - i;
- }
- plts[j].contents = plt_contents;
- /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
- if ((plt_type & plt_pic))
- got_addr = (bfd_vma) -1;
- }
- return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
- got_addr, plts, dynsyms,
- ret);
- }
- /* Set up i386 GNU properties. Return the first relocatable ELF input
- with GNU properties if found. Otherwise, return NULL. */
- static bfd *
- elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
- {
- struct elf_x86_init_table init_table;
- switch (get_elf_backend_data (info->output_bfd)->target_os)
- {
- case is_normal:
- case is_solaris:
- init_table.plt0_pad_byte = 0x0;
- init_table.lazy_plt = &elf_i386_lazy_plt;
- init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
- init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
- init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
- break;
- case is_vxworks:
- init_table.plt0_pad_byte = 0x90;
- init_table.lazy_plt = &elf_i386_lazy_plt;
- init_table.non_lazy_plt = NULL;
- init_table.lazy_ibt_plt = NULL;
- init_table.non_lazy_ibt_plt = NULL;
- break;
- default:
- abort ();
- }
- init_table.r_info = elf32_r_info;
- init_table.r_sym = elf32_r_sym;
- return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
- }
- #define TARGET_LITTLE_SYM i386_elf32_vec
- #define TARGET_LITTLE_NAME "elf32-i386"
- #define ELF_ARCH bfd_arch_i386
- #define ELF_TARGET_ID I386_ELF_DATA
- #define ELF_MACHINE_CODE EM_386
- #define ELF_MAXPAGESIZE 0x1000
- #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 12
- #define elf_backend_plt_alignment 4
- #define elf_backend_dtrel_excludes_plt 1
- #define elf_backend_extern_protected_data 1
- #define elf_backend_caches_rawsize 1
- #define elf_backend_want_dynrelro 1
- /* Support RELA for objdump of prelink objects. */
- #define elf_info_to_howto elf_i386_info_to_howto_rel
- #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
- #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
- #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
- #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
- #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
- #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
- #define elf_backend_always_size_sections elf_i386_always_size_sections
- #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
- #define elf_backend_fake_sections elf_i386_fake_sections
- #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
- #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
- #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
- #define elf_backend_grok_prstatus elf_i386_grok_prstatus
- #define elf_backend_grok_psinfo elf_i386_grok_psinfo
- #define elf_backend_reloc_type_class elf_i386_reloc_type_class
- #define elf_backend_relocate_section elf_i386_relocate_section
- #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
- #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
- #define elf_backend_linux_prpsinfo32_ugid16 true
- #define elf32_bed elf32_i386_bed
- #include "elf32-target.h"
- /* FreeBSD support. */
- #undef TARGET_LITTLE_SYM
- #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
- #undef TARGET_LITTLE_NAME
- #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
- #undef ELF_OSABI
- #define ELF_OSABI ELFOSABI_FREEBSD
- /* The kernel recognizes executables as valid only if they carry a
- "FreeBSD" label in the ELF header. So we put this label on all
- executables and (for simplicity) also all other object files. */
- static bool
- elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
- {
- if (!_bfd_elf_init_file_header (abfd, info))
- return false;
- #ifdef OLD_FREEBSD_ABI_LABEL
- {
- /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
- Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
- memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
- }
- #endif
- return true;
- }
- #undef elf_backend_init_file_header
- #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
- #undef elf32_bed
- #define elf32_bed elf32_i386_fbsd_bed
- #undef elf_backend_add_symbol_hook
- #include "elf32-target.h"
- #undef elf_backend_init_file_header
- /* Solaris 2. */
- #undef TARGET_LITTLE_SYM
- #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
- #undef TARGET_LITTLE_NAME
- #define TARGET_LITTLE_NAME "elf32-i386-sol2"
- #undef ELF_TARGET_OS
- #define ELF_TARGET_OS is_solaris
- /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
- objects won't be recognized. */
- #undef ELF_OSABI
- #undef elf32_bed
- #define elf32_bed elf32_i386_sol2_bed
- /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
- boundary. */
- #undef elf_backend_static_tls_alignment
- #define elf_backend_static_tls_alignment 8
- /* The Solaris 2 ABI requires a plt symbol on all platforms.
- Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
- File, p.63. */
- #undef elf_backend_want_plt_sym
- #define elf_backend_want_plt_sym 1
- #undef elf_backend_strtab_flags
- #define elf_backend_strtab_flags SHF_STRINGS
- /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
- has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
- FALSE otherwise. ISECTION is the best guess matching section from the
- input bfd IBFD, but it might be NULL. */
- static bool
- elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
- bfd *obfd ATTRIBUTE_UNUSED,
- const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
- Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
- {
- /* PR 19938: FIXME: Need to add code for setting the sh_info
- and sh_link fields of Solaris specific section types. */
- return false;
- /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
- Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
- http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
- The following values should be set:
- Type Link Info
- -----------------------------------------------------------------------------
- SHT_SUNW_ancillary The section header index of 0
- [0x6fffffee] the associated string table.
- SHT_SUNW_capinfo The section header index of For a dynamic object, the
- [0x6ffffff0] the associated symbol table. section header index of
- the associated
- SHT_SUNW_capchain table,
- otherwise 0.
- SHT_SUNW_symsort The section header index of 0
- [0x6ffffff1] the associated symbol table.
- SHT_SUNW_tlssort The section header index of 0
- [0x6ffffff2] the associated symbol table.
- SHT_SUNW_LDYNSYM The section header index of One greater than the
- [0x6ffffff3] the associated string table. symbol table index of the
- This index is the same string last local symbol,
- table used by the SHT_DYNSYM STB_LOCAL. Since
- section. SHT_SUNW_LDYNSYM only
- contains local symbols,
- sh_info is equivalent to
- the number of symbols in
- the table.
- SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
- [0x6ffffff5] the section header index of to named strings, the
- the associated section header index of
- SHT_SUNW_capinfo table, the associated string
- otherwise 0. table, otherwise 0.
- SHT_SUNW_move The section header index of 0
- [0x6ffffffa] the associated symbol table.
- SHT_SUNW_COMDAT 0 0
- [0x6ffffffb]
- SHT_SUNW_syminfo The section header index of The section header index
- [0x6ffffffc] the associated symbol table. of the associated
- .dynamic section.
- SHT_SUNW_verdef The section header index of The number of version
- [0x6ffffffd] the associated string table. definitions within the
- section.
- SHT_SUNW_verneed The section header index of The number of version
- [0x6ffffffe] the associated string table. dependencies within the
- section.
- SHT_SUNW_versym The section header index of 0
- [0x6fffffff] the associated symbol table. */
- }
- #undef elf_backend_copy_special_section_fields
- #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
- #include "elf32-target.h"
- /* Intel MCU support. */
- static bool
- elf32_iamcu_elf_object_p (bfd *abfd)
- {
- /* Set the right machine number for an IAMCU elf32 file. */
- bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
- return true;
- }
- #undef TARGET_LITTLE_SYM
- #define TARGET_LITTLE_SYM iamcu_elf32_vec
- #undef TARGET_LITTLE_NAME
- #define TARGET_LITTLE_NAME "elf32-iamcu"
- #undef ELF_ARCH
- #define ELF_ARCH bfd_arch_iamcu
- #undef ELF_MACHINE_CODE
- #define ELF_MACHINE_CODE EM_IAMCU
- #undef ELF_TARGET_OS
- #undef ELF_OSABI
- #undef elf32_bed
- #define elf32_bed elf32_iamcu_bed
- #undef elf_backend_object_p
- #define elf_backend_object_p elf32_iamcu_elf_object_p
- #undef elf_backend_static_tls_alignment
- #undef elf_backend_want_plt_sym
- #define elf_backend_want_plt_sym 0
- #undef elf_backend_strtab_flags
- #undef elf_backend_copy_special_section_fields
- #include "elf32-target.h"
- /* Restore defaults. */
- #undef ELF_ARCH
- #define ELF_ARCH bfd_arch_i386
- #undef ELF_MACHINE_CODE
- #define ELF_MACHINE_CODE EM_386
- #undef elf_backend_object_p
- /* VxWorks support. */
- #undef TARGET_LITTLE_SYM
- #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
- #undef TARGET_LITTLE_NAME
- #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
- #undef ELF_OSABI
- #undef ELF_MAXPAGESIZE
- #define ELF_MAXPAGESIZE 0x1000
- #undef elf_backend_plt_alignment
- #define elf_backend_plt_alignment 4
- #undef ELF_TARGET_OS
- #define ELF_TARGET_OS is_vxworks
- #undef elf_backend_relocs_compatible
- #undef elf_backend_add_symbol_hook
- #define elf_backend_add_symbol_hook \
- elf_vxworks_add_symbol_hook
- #undef elf_backend_link_output_symbol_hook
- #define elf_backend_link_output_symbol_hook \
- elf_vxworks_link_output_symbol_hook
- #undef elf_backend_emit_relocs
- #define elf_backend_emit_relocs elf_vxworks_emit_relocs
- #undef elf_backend_final_write_processing
- #define elf_backend_final_write_processing \
- elf_vxworks_final_write_processing
- #undef elf_backend_static_tls_alignment
- /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
- define it. */
- #undef elf_backend_want_plt_sym
- #define elf_backend_want_plt_sym 1
- #undef elf32_bed
- #define elf32_bed elf32_i386_vxworks_bed
- #include "elf32-target.h"
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