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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [bfd/] [elf32-cris.c] - Rev 359
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/* CRIS-specific support for 32-bit ELF. Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. Contributed by Axis Communications AB. Written by Hans-Peter Nilsson, based on elf32-fr30.c PIC and shlib bits based primarily on elf32-m68k.c and elf32-i386.c. 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 "sysdep.h" #include "bfd.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf/cris.h" #include <limits.h> /* Forward declarations. */ static reloc_howto_type * cris_reloc_type_lookup PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); static void cris_info_to_howto_rela PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); static bfd_reloc_status_type cris_elf_pcrel_reloc PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); static bfd_boolean cris_elf_grok_prstatus PARAMS ((bfd *abfd, Elf_Internal_Note *note)); static bfd_boolean cris_elf_grok_psinfo PARAMS ((bfd *abfd, Elf_Internal_Note *note)); static bfd_boolean cris_elf_relocate_section PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); static bfd_reloc_status_type cris_final_link_relocate PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma)); static bfd_boolean cris_elf_object_p PARAMS ((bfd *)); static void cris_elf_final_write_processing PARAMS ((bfd *, bfd_boolean)); static bfd_boolean cris_elf_set_mach_from_flags PARAMS ((bfd *, unsigned long int)); static bfd_boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR)); static bfd_boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *)); static bfd_boolean cris_elf_copy_private_bfd_data PARAMS ((bfd *, bfd *)); struct elf_cris_link_hash_entry; static bfd_boolean elf_cris_discard_excess_dso_dynamics PARAMS ((struct elf_cris_link_hash_entry *, PTR)); static bfd_boolean elf_cris_discard_excess_program_dynamics PARAMS ((struct elf_cris_link_hash_entry *, PTR)); static bfd_boolean elf_cris_adjust_gotplt_to_got PARAMS ((struct elf_cris_link_hash_entry *, PTR)); static bfd_boolean elf_cris_try_fold_plt_to_got PARAMS ((struct elf_cris_link_hash_entry *, PTR)); static struct bfd_hash_entry *elf_cris_link_hash_newfunc PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); static struct bfd_link_hash_table *elf_cris_link_hash_table_create PARAMS ((bfd *)); static bfd_boolean elf_cris_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); static bfd_boolean cris_elf_check_relocs PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); static bfd_boolean elf_cris_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); static bfd_boolean elf_cris_finish_dynamic_symbol PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, Elf_Internal_Sym *)); static bfd_boolean elf_cris_finish_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); static void elf_cris_hide_symbol PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean)); static enum elf_reloc_type_class elf_cris_reloc_type_class PARAMS ((const Elf_Internal_Rela *)); static reloc_howto_type cris_elf_howto_table [] = { /* This reloc does nothing. */ HOWTO (R_CRIS_NONE, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_NONE", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* An 8 bit absolute relocation. */ HOWTO (R_CRIS_8, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_8", /* name */ FALSE, /* partial_inplace */ 0x0000, /* src_mask */ 0x00ff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 16 bit absolute relocation. */ HOWTO (R_CRIS_16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_16", /* name */ FALSE, /* partial_inplace */ 0x00000000, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 32 bit absolute relocation. */ HOWTO (R_CRIS_32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ /* We don't want overflow complaints for 64-bit vma builds for e.g. sym+0x40000000 (or actually sym-0xc0000000 in 32-bit ELF) where sym=0xc0001234. Don't do this for the PIC relocs, as we don't expect to see them with large offsets. */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_32", /* name */ FALSE, /* partial_inplace */ 0x00000000, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* An 8 bit PC-relative relocation. */ HOWTO (R_CRIS_8_PCREL, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ cris_elf_pcrel_reloc, /* special_function */ "R_CRIS_8_PCREL", /* name */ FALSE, /* partial_inplace */ 0x0000, /* src_mask */ 0x00ff, /* dst_mask */ TRUE), /* pcrel_offset */ /* A 16 bit PC-relative relocation. */ HOWTO (R_CRIS_16_PCREL, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ cris_elf_pcrel_reloc, /* special_function */ "R_CRIS_16_PCREL", /* name */ FALSE, /* partial_inplace */ 0x00000000, /* src_mask */ 0x0000ffff, /* dst_mask */ TRUE), /* pcrel_offset */ /* A 32 bit PC-relative relocation. */ HOWTO (R_CRIS_32_PCREL, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ cris_elf_pcrel_reloc, /* special_function */ "R_CRIS_32_PCREL", /* name */ FALSE, /* partial_inplace */ 0x00000000, /* src_mask */ 0xffffffff, /* dst_mask */ TRUE), /* pcrel_offset */ /* GNU extension to record C++ vtable hierarchy. */ HOWTO (R_CRIS_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_CRIS_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_CRIS_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_CRIS_GNU_VTENTRY", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* This is used only by the dynamic linker. The symbol should exist both in the object being run and in some shared library. The dynamic linker copies the data addressed by the symbol from the shared library into the object, because the object being run has to have the data at some particular address. */ HOWTO (R_CRIS_COPY, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_COPY", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* Like R_CRIS_32, but used when setting global offset table entries. */ HOWTO (R_CRIS_GLOB_DAT, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_GLOB_DAT", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Marks a procedure linkage table entry for a symbol. */ HOWTO (R_CRIS_JUMP_SLOT, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_JUMP_SLOT", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* Used only by the dynamic linker. When the object is run, this longword is set to the load address of the object, plus the addend. */ HOWTO (R_CRIS_RELATIVE, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_RELATIVE", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Like R_CRIS_32, but referring to the GOT table entry for the symbol. */ HOWTO (R_CRIS_16_GOT, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_16_GOT", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0xffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_CRIS_32_GOT, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_32_GOT", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Like R_CRIS_32_GOT, but referring to (and requesting a) PLT part of the GOT table for the symbol. */ HOWTO (R_CRIS_16_GOTPLT, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_16_GOTPLT", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0xffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_CRIS_32_GOTPLT, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_32_GOTPLT", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 32-bit offset from GOT to (local const) symbol: no GOT entry should be necessary. */ HOWTO (R_CRIS_32_GOTREL, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_32_GOTREL", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 32-bit offset from GOT to entry for this symbol in PLT and request to create PLT entry for symbol. */ HOWTO (R_CRIS_32_PLT_GOTREL, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_32_PLT_GOTREL", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 32-bit offset from PC (location after the relocation) + addend to entry for this symbol in PLT and request to create PLT entry for symbol. */ HOWTO (R_CRIS_32_PLT_PCREL, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ cris_elf_pcrel_reloc, /* special_function */ "R_CRIS_32_PLT_PCREL", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ TRUE), /* pcrel_offset */ /* We don't handle these in any special manner and cross-format linking is not supported; just recognize them enough to pass them around. FIXME: do the same for most PIC relocs and add sanity tests to actually refuse gracefully to handle these and PIC relocs for cross-format linking. */ #define TLSHOWTO32(name) \ HOWTO (name, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, \ bfd_elf_generic_reloc, #name, FALSE, 0, 0xffffffff, FALSE) #define TLSHOWTO16X(name, X) \ HOWTO (name, 0, 1, 16, FALSE, 0, complain_overflow_ ## X, \ bfd_elf_generic_reloc, #name, FALSE, 0, 0xffff, FALSE) #define TLSHOWTO16(name) TLSHOWTO16X(name, unsigned) #define TLSHOWTO16S(name) TLSHOWTO16X(name, signed) TLSHOWTO32 (R_CRIS_32_GOT_GD), TLSHOWTO16 (R_CRIS_16_GOT_GD), TLSHOWTO32 (R_CRIS_32_GD), TLSHOWTO32 (R_CRIS_DTP), TLSHOWTO32 (R_CRIS_32_DTPREL), TLSHOWTO16S (R_CRIS_16_DTPREL), TLSHOWTO32 (R_CRIS_32_GOT_TPREL), TLSHOWTO16S (R_CRIS_16_GOT_TPREL), TLSHOWTO32 (R_CRIS_32_TPREL), TLSHOWTO16S (R_CRIS_16_TPREL), TLSHOWTO32 (R_CRIS_DTPMOD), TLSHOWTO32 (R_CRIS_32_IE) }; /* Map BFD reloc types to CRIS ELF reloc types. */ struct cris_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned int cris_reloc_val; }; static const struct cris_reloc_map cris_reloc_map [] = { { BFD_RELOC_NONE, R_CRIS_NONE }, { BFD_RELOC_8, R_CRIS_8 }, { BFD_RELOC_16, R_CRIS_16 }, { BFD_RELOC_32, R_CRIS_32 }, { BFD_RELOC_8_PCREL, R_CRIS_8_PCREL }, { BFD_RELOC_16_PCREL, R_CRIS_16_PCREL }, { BFD_RELOC_32_PCREL, R_CRIS_32_PCREL }, { BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT }, { BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY }, { BFD_RELOC_CRIS_COPY, R_CRIS_COPY }, { BFD_RELOC_CRIS_GLOB_DAT, R_CRIS_GLOB_DAT }, { BFD_RELOC_CRIS_JUMP_SLOT, R_CRIS_JUMP_SLOT }, { BFD_RELOC_CRIS_RELATIVE, R_CRIS_RELATIVE }, { BFD_RELOC_CRIS_16_GOT, R_CRIS_16_GOT }, { BFD_RELOC_CRIS_32_GOT, R_CRIS_32_GOT }, { BFD_RELOC_CRIS_16_GOTPLT, R_CRIS_16_GOTPLT }, { BFD_RELOC_CRIS_32_GOTPLT, R_CRIS_32_GOTPLT }, { BFD_RELOC_CRIS_32_GOTREL, R_CRIS_32_GOTREL }, { BFD_RELOC_CRIS_32_PLT_GOTREL, R_CRIS_32_PLT_GOTREL }, { BFD_RELOC_CRIS_32_PLT_PCREL, R_CRIS_32_PLT_PCREL }, { BFD_RELOC_CRIS_32_GOT_GD, R_CRIS_32_GOT_GD }, { BFD_RELOC_CRIS_16_GOT_GD, R_CRIS_16_GOT_GD }, { BFD_RELOC_CRIS_32_GD, R_CRIS_32_GD }, { BFD_RELOC_CRIS_DTP, R_CRIS_DTP }, { BFD_RELOC_CRIS_32_DTPREL, R_CRIS_32_DTPREL }, { BFD_RELOC_CRIS_16_DTPREL, R_CRIS_16_DTPREL }, { BFD_RELOC_CRIS_32_GOT_TPREL, R_CRIS_32_GOT_TPREL }, { BFD_RELOC_CRIS_16_GOT_TPREL, R_CRIS_16_GOT_TPREL }, { BFD_RELOC_CRIS_32_TPREL, R_CRIS_32_TPREL }, { BFD_RELOC_CRIS_16_TPREL, R_CRIS_16_TPREL }, { BFD_RELOC_CRIS_DTPMOD, R_CRIS_DTPMOD }, { BFD_RELOC_CRIS_32_IE, R_CRIS_32_IE } }; static reloc_howto_type * cris_reloc_type_lookup (abfd, code) bfd * abfd ATTRIBUTE_UNUSED; bfd_reloc_code_real_type code; { unsigned int i; for (i = 0; i < sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]); i++) if (cris_reloc_map [i].bfd_reloc_val == code) return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val]; return NULL; } static reloc_howto_type * cris_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) { unsigned int i; for (i = 0; i < sizeof (cris_elf_howto_table) / sizeof (cris_elf_howto_table[0]); i++) if (cris_elf_howto_table[i].name != NULL && strcasecmp (cris_elf_howto_table[i].name, r_name) == 0) return &cris_elf_howto_table[i]; return NULL; } /* Set the howto pointer for an CRIS ELF reloc. */ static void cris_info_to_howto_rela (abfd, cache_ptr, dst) bfd * abfd ATTRIBUTE_UNUSED; arelent * cache_ptr; Elf_Internal_Rela * dst; { enum elf_cris_reloc_type r_type; r_type = ELF32_R_TYPE (dst->r_info); BFD_ASSERT (r_type < (unsigned int) R_CRIS_max); cache_ptr->howto = & cris_elf_howto_table [r_type]; } bfd_reloc_status_type cris_elf_pcrel_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message) bfd *abfd ATTRIBUTE_UNUSED; arelent *reloc_entry; asymbol *symbol; PTR data ATTRIBUTE_UNUSED; asection *input_section; bfd *output_bfd; char **error_message ATTRIBUTE_UNUSED; { /* By default (using only bfd_elf_generic_reloc when linking to non-ELF formats) PC-relative relocs are relative to the beginning of the reloc. CRIS PC-relative relocs are relative to the position *after* the reloc because that's what pre-CRISv32 PC points to after reading an insn field with that reloc. (For CRISv32, PC is actually relative to the start of the insn, but we keep the old definition.) Still, we use as much generic machinery as we can. Only adjust when doing a final link. */ if (output_bfd == (bfd *) NULL) reloc_entry->addend -= 1 << reloc_entry->howto->size; return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message); } /* Support for core dump NOTE sections. The slightly unintuitive code layout is an attempt to keep at least some similarities with other ports, hoping to simplify general changes, while still keeping Linux/CRIS and Linux/CRISv32 code apart. */ static bfd_boolean cris_elf_grok_prstatus (abfd, note) bfd *abfd; Elf_Internal_Note *note; { int offset; size_t size; if (bfd_get_mach (abfd) == bfd_mach_cris_v32) switch (note->descsz) { default: return FALSE; case 202: /* Linux/CRISv32 */ /* pr_cursig */ elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); /* pr_pid */ elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 22); /* pr_reg */ offset = 70; size = 128; break; } else switch (note->descsz) { default: return FALSE; case 214: /* Linux/CRIS */ /* pr_cursig */ elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); /* pr_pid */ elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 22); /* pr_reg */ offset = 70; size = 140; break; } /* Make a ".reg/999" section. */ return _bfd_elfcore_make_pseudosection (abfd, ".reg", size, note->descpos + offset); } static bfd_boolean cris_elf_grok_psinfo (abfd, note) bfd *abfd; Elf_Internal_Note *note; { if (bfd_get_mach (abfd) == bfd_mach_cris_v32) switch (note->descsz) { default: return FALSE; case 124: /* Linux/CRISv32 elf_prpsinfo */ 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); } else switch (note->descsz) { default: return FALSE; case 124: /* Linux/CRIS elf_prpsinfo */ 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; } /* The name of the dynamic interpreter. This is put in the .interp section. */ #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" /* The size in bytes of an entry in the procedure linkage table. */ #define PLT_ENTRY_SIZE 20 #define PLT_ENTRY_SIZE_V32 26 /* The first entry in an absolute procedure linkage table looks like this. */ static const bfd_byte elf_cris_plt0_entry[PLT_ENTRY_SIZE] = { 0xfc, 0xe1, 0x7e, 0x7e, /* push mof. */ 0x7f, 0x0d, /* (dip [pc+]) */ 0, 0, 0, 0, /* Replaced with address of .got + 4. */ 0x30, 0x7a, /* move [...],mof */ 0x7f, 0x0d, /* (dip [pc+]) */ 0, 0, 0, 0, /* Replaced with address of .got + 8. */ 0x30, 0x09 /* jump [...] */ }; static const bfd_byte elf_cris_plt0_entry_v32[PLT_ENTRY_SIZE_V32] = { 0x84, 0xe2, /* subq 4,$sp */ 0x6f, 0xfe, /* move.d 0,$acr */ 0, 0, 0, 0, /* Replaced by address of .got + 4. */ 0x7e, 0x7a, /* move $mof,[$sp] */ 0x3f, 0x7a, /* move [$acr],$mof */ 0x04, 0xf2, /* addq 4,acr */ 0x6f, 0xfa, /* move.d [$acr],$acr */ 0xbf, 0x09, /* jump $acr */ 0xb0, 0x05, /* nop */ 0, 0 /* Pad out to 26 bytes. */ }; /* Subsequent entries in an absolute procedure linkage table look like this. */ static const bfd_byte elf_cris_plt_entry[PLT_ENTRY_SIZE] = { 0x7f, 0x0d, /* (dip [pc+]) */ 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */ 0x30, 0x09, /* jump [...] */ 0x3f, 0x7e, /* move [pc+],mof */ 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 0x2f, 0xfe, /* add.d [pc+],pc */ 0xec, 0xff, 0xff, 0xff /* Replaced with offset to start of .plt. */ }; static const bfd_byte elf_cris_plt_entry_v32[PLT_ENTRY_SIZE_V32] = { 0x6f, 0xfe, /* move.d 0,$acr */ 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */ 0x6f, 0xfa, /* move.d [$acr],$acr */ 0xbf, 0x09, /* jump $acr */ 0xb0, 0x05, /* nop */ 0x3f, 0x7e, /* move 0,mof */ 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 0xbf, 0x0e, /* ba start_of_plt0_entry */ 0, 0, 0, 0, /* Replaced with offset to plt0 entry. */ 0xb0, 0x05 /* nop */ }; /* The first entry in a PIC procedure linkage table looks like this. */ static const bfd_byte elf_cris_pic_plt0_entry[PLT_ENTRY_SIZE] = { 0xfc, 0xe1, 0x7e, 0x7e, /* push mof */ 0x04, 0x01, 0x30, 0x7a, /* move [r0+4],mof */ 0x08, 0x01, 0x30, 0x09, /* jump [r0+8] */ 0, 0, 0, 0, 0, 0, 0, 0, /* Pad out to 20 bytes. */ }; static const bfd_byte elf_cris_pic_plt0_entry_v32[PLT_ENTRY_SIZE_V32] = { 0x84, 0xe2, /* subq 4,$sp */ 0x04, 0x01, /* addoq 4,$r0,$acr */ 0x7e, 0x7a, /* move $mof,[$sp] */ 0x3f, 0x7a, /* move [$acr],$mof */ 0x04, 0xf2, /* addq 4,$acr */ 0x6f, 0xfa, /* move.d [$acr],$acr */ 0xbf, 0x09, /* jump $acr */ 0xb0, 0x05, /* nop */ 0, 0, /* Pad out to 26 bytes. */ 0, 0, 0, 0, 0, 0, 0, 0 }; /* Subsequent entries in a PIC procedure linkage table look like this. */ static const bfd_byte elf_cris_pic_plt_entry[PLT_ENTRY_SIZE] = { 0x6f, 0x0d, /* (bdap [pc+].d,r0) */ 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */ 0x30, 0x09, /* jump [...] */ 0x3f, 0x7e, /* move [pc+],mof */ 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 0x2f, 0xfe, /* add.d [pc+],pc */ 0xec, 0xff, /* Replaced with offset to start of .plt. */ 0xff, 0xff }; static const bfd_byte elf_cris_pic_plt_entry_v32[PLT_ENTRY_SIZE_V32] = { 0x6f, 0x0d, /* addo.d 0,$r0,$acr */ 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */ 0x6f, 0xfa, /* move.d [$acr],$acr */ 0xbf, 0x09, /* jump $acr */ 0xb0, 0x05, /* nop */ 0x3f, 0x7e, /* move relocoffs,$mof */ 0, 0, 0, 0, /* Replaced with offset into relocation table. */ 0xbf, 0x0e, /* ba start_of_plt */ 0, 0, 0, 0, /* Replaced with offset to start of .plt. */ 0xb0, 0x05 /* nop */ }; /* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits (and most other PIC/shlib stuff). Check that we don't drift away without reason. The CRIS linker, like the m68k and i386 linkers (and probably the rest too) needs to keep track of the number of relocs that it decides to copy in check_relocs for each symbol. This is so that it can discard PC relative relocs if it doesn't need them when linking with -Bsymbolic. We store the information in a field extending the regular ELF linker hash table. */ /* This structure keeps track of the number of PC relative relocs we have copied for a given symbol. */ struct elf_cris_pcrel_relocs_copied { /* Next section. */ struct elf_cris_pcrel_relocs_copied *next; /* A section in dynobj. */ asection *section; /* Number of relocs copied in this section. */ bfd_size_type count; /* Example of reloc being copied, for message. */ enum elf_cris_reloc_type r_type; }; /* CRIS ELF linker hash entry. */ struct elf_cris_link_hash_entry { struct elf_link_hash_entry root; /* Number of PC relative relocs copied for this symbol. */ struct elf_cris_pcrel_relocs_copied *pcrel_relocs_copied; /* The GOTPLT references are CRIS-specific; the goal is to avoid having both a general GOT and a PLT-specific GOT entry for the same symbol, when it is referenced both as a function and as a function pointer. Number of GOTPLT references for a function. */ bfd_signed_vma gotplt_refcount; /* Actual GOTPLT index for this symbol, if applicable, or zero if not (zero is never used as an index). FIXME: We should be able to fold this with gotplt_refcount in a union, like the got and plt unions in elf_link_hash_entry. */ bfd_size_type gotplt_offset; /* The root.got.refcount is the sum of the regular reference counts (this) and those members below. We have to keep a separate count to track when we've found the first (or last) reference to a regular got entry. The offset is in root.got.offset. */ bfd_signed_vma reg_got_refcount; /* Similar to the above, the number of reloc references to this symbols that need a R_CRIS_32_TPREL slot. The offset is in root.got.offset, because this and .dtp_refcount can't validly happen when there's also a regular GOT entry; that's invalid input for which an error is emitted. */ bfd_signed_vma tprel_refcount; /* Similar to the above, the number of reloc references to this symbols that need a R_CRIS_DTP slot. The offset is in root.got.offset; plus 4 if .tprel_refcount > 0. */ bfd_signed_vma dtp_refcount; }; /* The local_got_refcounts and local_got_offsets are a multiple of LSNUM in size, namely LGOT_ALLOC_NELTS_FOR(LSNUM) (plus one for the refcount for GOT itself, see code), with the summary / group offset for local symbols located at offset N, reference counts for ordinary (address) relocs at offset N + LSNUM, for R_CRIS_DTP relocs at offset N + 2*LSNUM, and for R_CRIS_32_TPREL relocs at N + 3*LSNUM. */ #define LGOT_REG_NDX(x) ((x) + symtab_hdr->sh_info) #define LGOT_DTP_NDX(x) ((x) + 2 * symtab_hdr->sh_info) #define LGOT_TPREL_NDX(x) ((x) + 3 * symtab_hdr->sh_info) #define LGOT_ALLOC_NELTS_FOR(x) ((x) * 4) /* CRIS ELF linker hash table. */ struct elf_cris_link_hash_table { struct elf_link_hash_table root; /* We can't use the PLT offset and calculate to get the GOTPLT offset, since we try and avoid creating GOTPLT:s when there's already a GOT. Instead, we keep and update the next available index here. */ bfd_size_type next_gotplt_entry; /* The number of R_CRIS_32_DTPREL and R_CRIS_16_DTPREL that have been seen for any input; if != 0, then the constant-offset R_CRIS_DTPMOD is needed for this DSO/executable. This turns negative at relocation, so that we don't need an extra flag for when the reloc is output. */ bfd_signed_vma dtpmod_refcount; }; /* Traverse a CRIS ELF linker hash table. */ #define elf_cris_link_hash_traverse(table, func, info) \ (elf_link_hash_traverse \ (&(table)->root, \ (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \ (info))) /* Get the CRIS ELF linker hash table from a link_info structure. */ #define elf_cris_hash_table(p) \ (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ == CRIS_ELF_DATA ? ((struct elf_cris_link_hash_table *) ((p)->hash)) : NULL) /* Get the CRIS ELF linker hash entry from a regular hash entry (the "parent class"). The .root reference is just a simple type check on the argument. */ #define elf_cris_hash_entry(p) \ ((struct elf_cris_link_hash_entry *) (&(p)->root)) /* Create an entry in a CRIS ELF linker hash table. */ static struct bfd_hash_entry * elf_cris_link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, const char *string) { struct elf_cris_link_hash_entry *ret = (struct elf_cris_link_hash_entry *) entry; /* Allocate the structure if it has not already been allocated by a subclass. */ if (ret == (struct elf_cris_link_hash_entry *) NULL) ret = ((struct elf_cris_link_hash_entry *) bfd_hash_allocate (table, sizeof (struct elf_cris_link_hash_entry))); if (ret == (struct elf_cris_link_hash_entry *) NULL) return (struct bfd_hash_entry *) ret; /* Call the allocation method of the superclass. */ ret = ((struct elf_cris_link_hash_entry *) _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, table, string)); if (ret != (struct elf_cris_link_hash_entry *) NULL) { ret->pcrel_relocs_copied = NULL; ret->gotplt_refcount = 0; ret->gotplt_offset = 0; ret->dtp_refcount = 0; ret->tprel_refcount = 0; ret->reg_got_refcount = 0; } return (struct bfd_hash_entry *) ret; } /* Create a CRIS ELF linker hash table. */ static struct bfd_link_hash_table * elf_cris_link_hash_table_create (bfd *abfd) { struct elf_cris_link_hash_table *ret; bfd_size_type amt = sizeof (struct elf_cris_link_hash_table); ret = ((struct elf_cris_link_hash_table *) bfd_malloc (amt)); if (ret == (struct elf_cris_link_hash_table *) NULL) return NULL; if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, elf_cris_link_hash_newfunc, sizeof (struct elf_cris_link_hash_entry), CRIS_ELF_DATA)) { free (ret); return NULL; } /* Initialize to skip over the first three entries in the gotplt; they are used for run-time symbol evaluation. */ ret->next_gotplt_entry = 12; /* We haven't seen any R_CRIS_nn_GOT_TPREL initially. */ ret->dtpmod_refcount = 0; return &ret->root.root; } /* Perform a single relocation. By default we use the standard BFD routines, with a few tweaks. */ static bfd_reloc_status_type cris_final_link_relocate (howto, input_bfd, input_section, contents, rel, relocation) reloc_howto_type * howto; bfd * input_bfd; asection * input_section; bfd_byte * contents; Elf_Internal_Rela * rel; bfd_vma relocation; { bfd_reloc_status_type r; enum elf_cris_reloc_type r_type = ELF32_R_TYPE (rel->r_info); /* PC-relative relocations are relative to the position *after* the reloc. Note that for R_CRIS_8_PCREL the adjustment is not a single byte, since PC must be 16-bit-aligned. */ switch (r_type) { /* Check that the 16-bit GOT relocs are positive. */ case R_CRIS_16_GOTPLT: case R_CRIS_16_GOT: if ((bfd_signed_vma) relocation < 0) return bfd_reloc_overflow; break; case R_CRIS_32_PLT_PCREL: case R_CRIS_32_PCREL: relocation -= 2; /* Fall through. */ case R_CRIS_8_PCREL: case R_CRIS_16_PCREL: relocation -= 2; break; default: break; } r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, rel->r_offset, relocation, rel->r_addend); return r; } /* The number of errors left before we stop outputting reloc-specific explanatory messages. By coincidence, this works nicely together with the default number of messages you'll get from LD about "relocation truncated to fit" messages before you get an "additional relocation overflows omitted from the output". */ static int additional_relocation_error_msg_count = 10; /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was copied, for further comments. */ static bfd_boolean cris_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 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_cris_link_hash_table * htab; bfd *dynobj; Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; bfd_vma *local_got_offsets; asection *sgot; asection *splt; asection *sreloc; Elf_Internal_Rela *rel; Elf_Internal_Rela *relend; asection *srelgot; htab = elf_cris_hash_table (info); if (htab == NULL) return FALSE; dynobj = elf_hash_table (info)->dynobj; local_got_offsets = elf_local_got_offsets (input_bfd); symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; sym_hashes = elf_sym_hashes (input_bfd); relend = relocs + input_section->reloc_count; sgot = NULL; splt = NULL; sreloc = NULL; srelgot = NULL; if (dynobj != NULL) { splt = bfd_get_section_by_name (dynobj, ".plt"); sgot = bfd_get_section_by_name (dynobj, ".got"); } for (rel = relocs; rel < relend; rel ++) { reloc_howto_type *howto; unsigned long r_symndx; Elf_Internal_Sym *sym; asection *sec; struct elf_link_hash_entry *h; bfd_vma relocation; bfd_reloc_status_type r; const char *symname = NULL; enum elf_cris_reloc_type r_type; r_type = ELF32_R_TYPE (rel->r_info); if ( r_type == R_CRIS_GNU_VTINHERIT || r_type == R_CRIS_GNU_VTENTRY) continue; r_symndx = ELF32_R_SYM (rel->r_info); howto = cris_elf_howto_table + r_type; h = NULL; sym = NULL; sec = NULL; if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; sec = local_sections [r_symndx]; relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); symname = (bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, sym->st_name)); if (symname == NULL) symname = bfd_section_name (input_bfd, sec); } else { bfd_boolean warned; bfd_boolean unresolved_reloc; RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, r_symndx, symtab_hdr, sym_hashes, h, sec, relocation, unresolved_reloc, warned); symname = h->root.root.string; if (unresolved_reloc /* Perhaps we should detect the cases that sec->output_section is expected to be NULL like i386 and m68k, but apparently (and according to elfxx-ia64.c) all valid cases are where the symbol is defined in a shared object which we link dynamically against. This includes PLT relocs for which we've created a PLT entry and other relocs for which we're prepared to create dynamic relocations. For now, new situations cause us to just err when sec->output_offset is NULL but the object with the symbol is *not* dynamically linked against. Thus this will automatically remind us so we can see if there are other valid cases we need to revisit. */ && (sec->owner->flags & DYNAMIC) != 0) relocation = 0; else if (h->root.type == bfd_link_hash_defined || h->root.type == bfd_link_hash_defweak) { /* Here follow the cases where the relocation value must be zero (or when further handling is simplified when zero). I can't claim to understand the various conditions and they weren't described in the files where I copied them from (elf32-m68k.c and elf32-i386.c), but let's mention examples of where they happen. FIXME: Perhaps define and use a dynamic_symbol_p function like ia64. - When creating a shared library, we can have an ordinary relocation for a symbol defined in a shared library (perhaps the one we create). We then make the relocation value zero, as the value seen now will be added into the relocation addend in this shared library, but must be handled only at dynamic-link time. FIXME: Not sure this example covers the h->elf_link_hash_flags test, though it's there in other targets. */ if (info->shared && ((! info->symbolic && h->dynindx != -1) || !h->def_regular) && (input_section->flags & SEC_ALLOC) != 0 && (r_type == R_CRIS_8 || r_type == R_CRIS_16 || r_type == R_CRIS_32 || r_type == R_CRIS_8_PCREL || r_type == R_CRIS_16_PCREL || r_type == R_CRIS_32_PCREL)) relocation = 0; else if (!info->relocatable && unresolved_reloc) { _bfd_error_handler (_("%B, section %A: unresolvable relocation %s against symbol `%s'"), input_bfd, input_section, cris_elf_howto_table[r_type].name, symname); bfd_set_error (bfd_error_bad_value); return FALSE; } } } if (sec != NULL && elf_discarded_section (sec)) { /* For relocs against symbols from removed linkonce sections, or sections discarded by a linker script, we just want the section contents zeroed. Avoid any special processing. */ _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); rel->r_info = 0; rel->r_addend = 0; continue; } if (info->relocatable) continue; switch (r_type) { case R_CRIS_16_GOTPLT: case R_CRIS_32_GOTPLT: /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT, but we require a PLT, and the PLT handling will take care of filling in the PLT-specific GOT entry. For the GOT offset, calculate it as we do when filling it in for the .got.plt section. If we don't have a PLT, punt to GOT handling. */ if (h != NULL && ((struct elf_cris_link_hash_entry *) h)->gotplt_offset != 0) { asection *sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); bfd_vma got_offset; BFD_ASSERT (h->dynindx != -1); BFD_ASSERT (sgotplt != NULL); got_offset = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset; relocation = got_offset; break; } /* We didn't make a PLT entry for this symbol. Maybe everything is folded into the GOT. Other than folding, this happens when statically linking PIC code, or when using -Bsymbolic. Check that we instead have a GOT entry as done for us by elf_cris_adjust_dynamic_symbol, and drop through into the ordinary GOT cases. This must not happen for the executable, because any reference it does to a function that is satisfied by a DSO must generate a PLT. We assume these call-specific relocs don't address non-functions. */ if (h != NULL && (h->got.offset == (bfd_vma) -1 || (!info->shared && !(h->def_regular || (!h->def_dynamic && h->root.type == bfd_link_hash_undefweak))))) { (*_bfd_error_handler) ((h->got.offset == (bfd_vma) -1) ? _("%B, section %A: No PLT nor GOT for relocation %s" " against symbol `%s'") : _("%B, section %A: No PLT for relocation %s" " against symbol `%s'"), input_bfd, input_section, cris_elf_howto_table[r_type].name, (symname != NULL && symname[0] != '\0' ? symname : _("[whose name is lost]"))); /* FIXME: Perhaps blaming input is not the right thing to do; this is probably an internal error. But it is true that we didn't like that particular input. */ bfd_set_error (bfd_error_bad_value); return FALSE; } /* Fall through. */ /* The size of the actual relocation is not used here; we only fill in the GOT table here. */ case R_CRIS_16_GOT: case R_CRIS_32_GOT: { bfd_vma off; /* Note that despite using RELA relocations, the .got contents is always filled in with the link-relative relocation value; the addend. */ if (h != NULL) { off = h->got.offset; BFD_ASSERT (off != (bfd_vma) -1); if (!elf_hash_table (info)->dynamic_sections_created || (! info->shared && (h->def_regular || h->type == STT_FUNC || h->needs_plt)) || (info->shared && (info->symbolic || h->dynindx == -1) && h->def_regular)) { /* This wasn't checked above for ! info->shared, but must hold there if we get here; the symbol must be defined in the regular program or be undefweak or be a function or otherwise need a PLT. */ BFD_ASSERT (!elf_hash_table (info)->dynamic_sections_created || info->shared || h->def_regular || h->type == STT_FUNC || h->needs_plt || h->root.type == bfd_link_hash_undefweak); /* This is actually a static link, or it is a -Bsymbolic link and the symbol is defined locally, or is undefweak, or the symbol was forced to be local because of a version file, or we're not creating a dynamic object. 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. If this GOT entry should be runtime-initialized, we will 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, sgot->contents + off); h->got.offset |= 1; } } } else { BFD_ASSERT (local_got_offsets != NULL && local_got_offsets[r_symndx] != (bfd_vma) -1); 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, sgot->contents + off); if (info->shared) { Elf_Internal_Rela outrel; bfd_byte *loc; if (srelgot == NULL) srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); BFD_ASSERT (srelgot != NULL); outrel.r_offset = (sgot->output_section->vma + sgot->output_offset + off); outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); outrel.r_addend = relocation; loc = srelgot->contents; loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); } local_got_offsets[r_symndx] |= 1; } } relocation = sgot->output_offset + off; if (rel->r_addend != 0) { /* We can't do anything for a relocation which is against a symbol *plus offset*. GOT holds relocations for symbols. Make this an error; the compiler isn't allowed to pass us these kinds of things. */ if (h == NULL) (*_bfd_error_handler) (_("%B, section %A: relocation %s with non-zero addend %d" " against local symbol"), input_bfd, input_section, cris_elf_howto_table[r_type].name, rel->r_addend); else (*_bfd_error_handler) (_("%B, section %A: relocation %s with non-zero addend %d" " against symbol `%s'"), input_bfd, input_section, cris_elf_howto_table[r_type].name, rel->r_addend, symname[0] != '\0' ? symname : _("[whose name is lost]")); bfd_set_error (bfd_error_bad_value); return FALSE; } } break; case R_CRIS_32_GOTREL: /* This relocation must only be performed against local symbols. It's also ok when we link a program and the symbol is either defined in an ordinary (non-DSO) object or is undefined weak. */ if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT && !(!info->shared && (h->def_regular || (!h->def_dynamic && h->root.type == bfd_link_hash_undefweak)))) { (*_bfd_error_handler) (_("%B, section %A: relocation %s is" " not allowed for global symbol: `%s'"), input_bfd, input_section, cris_elf_howto_table[r_type].name, symname); bfd_set_error (bfd_error_bad_value); return FALSE; } /* This can happen if we get a link error with the input ELF variant mismatching the output variant. Emit an error so it's noticed if it happens elsewhere. */ if (sgot == NULL) { (*_bfd_error_handler) (_("%B, section %A: relocation %s with no GOT created"), input_bfd, input_section, cris_elf_howto_table[r_type].name); bfd_set_error (bfd_error_bad_value); return FALSE; } /* This relocation is like a PC-relative one, except the reference point is the location of GOT. Note that sgot->output_offset is not involved in this calculation. We always want the start of entire .got section, not the position after the reserved header. */ relocation -= sgot->output_section->vma; break; case R_CRIS_32_PLT_PCREL: /* Relocation is to the entry for this symbol in the procedure linkage table. */ /* Resolve a PLT_PCREL reloc against a local symbol directly, without using the procedure linkage table. */ if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) break; if (h->plt.offset == (bfd_vma) -1 || splt == NULL) { /* We didn't make a PLT entry for this symbol. This happens when statically linking PIC code, or when using -Bsymbolic. */ break; } relocation = (splt->output_section->vma + splt->output_offset + h->plt.offset); break; case R_CRIS_32_PLT_GOTREL: /* Like R_CRIS_32_PLT_PCREL, but the reference point is the start of the .got section. See also comment at R_CRIS_32_GOT. */ relocation -= sgot->output_section->vma; /* Resolve a PLT_GOTREL reloc against a local symbol directly, without using the procedure linkage table. */ if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) break; if (h->plt.offset == (bfd_vma) -1 || splt == NULL) { /* We didn't make a PLT entry for this symbol. This happens when statically linking PIC code, or when using -Bsymbolic. */ break; } relocation = (splt->output_section->vma + splt->output_offset + h->plt.offset - sgot->output_section->vma); break; case R_CRIS_8_PCREL: case R_CRIS_16_PCREL: case R_CRIS_32_PCREL: /* If the symbol was local, we need no shlib-specific handling. */ if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT || h->dynindx == -1) break; /* Fall through. */ case R_CRIS_8: case R_CRIS_16: case R_CRIS_32: if (info->shared && r_symndx != 0 && (input_section->flags & SEC_ALLOC) != 0 && ((r_type != R_CRIS_8_PCREL && r_type != R_CRIS_16_PCREL && r_type != R_CRIS_32_PCREL) || (!info->symbolic || (h != NULL && !h->def_regular)))) { Elf_Internal_Rela outrel; bfd_byte *loc; bfd_boolean skip, relocate; /* When generating a shared object, these relocations are copied into the output file to be resolved at run time. */ if (sreloc == NULL) { sreloc = _bfd_elf_get_dynamic_reloc_section (input_bfd, input_section, /*rela?*/ TRUE); /* The section should have been created in cris_elf_check_relocs, but that function will not be called for objects which fail in cris_elf_merge_private_bfd_data. */ if (sreloc == NULL) { bfd_set_error (bfd_error_bad_value); return FALSE; } } 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 /* For now, undefined weak symbols with non-default visibility (yielding 0), like exception info for discarded sections, will get a R_CRIS_NONE relocation rather than no relocation, because we notice too late that the symbol doesn't need a relocation. */ || (h != NULL && h->root.type == bfd_link_hash_undefweak && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)) skip = TRUE, relocate = TRUE; outrel.r_offset += (input_section->output_section->vma + input_section->output_offset); if (skip) memset (&outrel, 0, sizeof outrel); /* h->dynindx may be -1 if the symbol was marked to become local. */ else if (h != NULL && ((! info->symbolic && h->dynindx != -1) || !h->def_regular)) { BFD_ASSERT (h->dynindx != -1); outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); outrel.r_addend = relocation + rel->r_addend; } else { outrel.r_addend = relocation + rel->r_addend; if (r_type == R_CRIS_32) { relocate = TRUE; outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); } else { long indx; if (bfd_is_abs_section (sec)) indx = 0; else if (sec == NULL || sec->owner == NULL) { bfd_set_error (bfd_error_bad_value); return FALSE; } else { asection *osec; /* We are turning this relocation into one against a section symbol. It would be proper to subtract the symbol's value, osec->vma, from the emitted reloc addend, but ld.so expects buggy relocs. */ osec = sec->output_section; indx = elf_section_data (osec)->dynindx; if (indx == 0) { osec = htab->root.text_index_section; indx = elf_section_data (osec)->dynindx; } BFD_ASSERT (indx != 0); } outrel.r_info = ELF32_R_INFO (indx, r_type); } } loc = sreloc->contents; loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); /* This reloc will be computed at runtime, so there's no need to do anything now, except for R_CRIS_32 relocations that have been turned into R_CRIS_RELATIVE. */ if (!relocate) continue; } break; case R_CRIS_16_DTPREL: case R_CRIS_32_DTPREL: /* This relocation must only be performed against local symbols, or to sections that are not loadable. It's also ok when we link a program and the symbol is defined in an ordinary (non-DSO) object (if it's undefined there, we've already seen an error). */ if (h != NULL && (input_section->flags & SEC_ALLOC) != 0 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT && (info->shared || (!h->def_regular && h->root.type != bfd_link_hash_undefined))) { (*_bfd_error_handler) ((h->root.type == bfd_link_hash_undefined) /* We shouldn't get here for GCC-emitted code. */ ? _("%B, section %A: relocation %s has an undefined" " reference to `%s', perhaps a declaration mixup?") : ("%B, section %A: relocation %s is" " not allowed for `%s', a global symbol with default" " visibility, perhaps a declaration mixup?"), input_bfd, input_section, cris_elf_howto_table[r_type].name, symname != NULL && symname[0] != '\0' ? symname : _("[whose name is lost]")); bfd_set_error (bfd_error_bad_value); return FALSE; } BFD_ASSERT ((input_section->flags & SEC_ALLOC) == 0 || htab->dtpmod_refcount != 0); /* Fill in a R_CRIS_DTPMOD reloc at offset 3 if we haven't already done so. Note that we do this in .got.plt, not in .got, as .got.plt contains the first part, still the reloc is against .got, because the linker script directs (is required to direct) them both into .got. */ if (htab->dtpmod_refcount > 0 && (input_section->flags & SEC_ALLOC) != 0) { asection *sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); BFD_ASSERT (sgotplt != NULL); if (info->shared) { Elf_Internal_Rela outrel; bfd_byte *loc; if (srelgot == NULL) srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); BFD_ASSERT (srelgot != NULL); loc = srelgot->contents; loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents + 12); bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents + 16); outrel.r_offset = (sgotplt->output_section->vma + sgotplt->output_offset + 12); outrel.r_info = ELF32_R_INFO (0, R_CRIS_DTPMOD); outrel.r_addend = 0; bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); } else { /* For an executable, the GOT entry contents is known. */ bfd_put_32 (output_bfd, (bfd_vma) 1, sgotplt->contents + 12); bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents + 16); } /* Reverse the sign to mark that we've emitted the required GOT entry. */ htab->dtpmod_refcount = - htab->dtpmod_refcount; } /* The relocation is the offset from the start of the module TLS block to the (local) symbol. */ relocation -= elf_hash_table (info)->tls_sec == NULL ? 0 : elf_hash_table (info)->tls_sec->vma; break; case R_CRIS_32_GD: if (info->shared) { bfd_set_error (bfd_error_invalid_operation); /* We've already informed in cris_elf_check_relocs that this is an error. */ return FALSE; } /* Fall through. */ case R_CRIS_16_GOT_GD: case R_CRIS_32_GOT_GD: if (rel->r_addend != 0) { /* We can't do anything for a relocation which is against a symbol *plus offset*. The GOT holds relocations for symbols. Make this an error; the compiler isn't allowed to pass us these kinds of things. */ (*_bfd_error_handler) (_("%B, section %A: relocation %s with non-zero addend %d" " against symbol `%s'"), input_bfd, input_section, cris_elf_howto_table[r_type].name, rel->r_addend, symname[0] != '\0' ? symname : _("[whose name is lost]")); bfd_set_error (bfd_error_bad_value); return FALSE; } if (!info->shared && (h == NULL || h->def_regular || ELF_COMMON_DEF_P (h))) { /* Known contents of the GOT. */ bfd_vma off; /* The symbol is defined in the program, so just write (1, known_tpoffset) into the GOT. */ relocation -= elf_hash_table (info)->tls_sec->vma; if (h != NULL) { off = elf_cris_hash_entry (h)->tprel_refcount > 0 ? h->got.offset + 4 : h->got.offset; } else { off = local_got_offsets[r_symndx]; if (local_got_offsets[LGOT_TPREL_NDX (r_symndx)]) off += 4; } /* We use bit 1 of the offset as a flag for GOT entry with the R_CRIS_DTP reloc, setting it when we've emitted the GOT entry and reloc. Bit 0 is used for R_CRIS_32_TPREL relocs. */ if ((off & 2) == 0) { off &= ~3; if (h != NULL) h->got.offset |= 2; else local_got_offsets[r_symndx] |= 2; bfd_put_32 (output_bfd, 1, sgot->contents + off); bfd_put_32 (output_bfd, relocation, sgot->contents + off + 4); } else off &= ~3; relocation = sgot->output_offset + off + (r_type == R_CRIS_32_GD ? sgot->output_section->vma : 0); } else { /* Not all parts of the GOT entry are known; emit a real relocation. */ bfd_vma off; if (h != NULL) off = elf_cris_hash_entry (h)->tprel_refcount > 0 ? h->got.offset + 4 : h->got.offset; else { off = local_got_offsets[r_symndx]; if (local_got_offsets[LGOT_TPREL_NDX (r_symndx)]) off += 4; } /* See above re bit 1 and bit 0 usage. */ if ((off & 2) == 0) { Elf_Internal_Rela outrel; bfd_byte *loc; off &= ~3; if (h != NULL) h->got.offset |= 2; else local_got_offsets[r_symndx] |= 2; /* Clear the target contents of the GOT (just as a gesture; it's already cleared on allocation): this relocation is not like the other dynrelocs. */ bfd_put_32 (output_bfd, 0, sgot->contents + off); bfd_put_32 (output_bfd, 0, sgot->contents + off + 4); if (srelgot == NULL) srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); BFD_ASSERT (srelgot != NULL); if (h != NULL && h->dynindx != -1) { outrel.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_DTP); relocation = 0; } else { outrel.r_info = ELF32_R_INFO (0, R_CRIS_DTP); /* NULL if we had an error. */ relocation -= elf_hash_table (info)->tls_sec == NULL ? 0 : elf_hash_table (info)->tls_sec->vma; } outrel.r_offset = (sgot->output_section->vma + sgot->output_offset + off); outrel.r_addend = relocation; loc = srelgot->contents; loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); /* NULL if we had an error. */ if (srelgot->contents != NULL) bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); } else off &= ~3; relocation = sgot->output_offset + off + (r_type == R_CRIS_32_GD ? sgot->output_section->vma : 0); } /* The GOT-relative offset to the GOT entry is the relocation, or for R_CRIS_32_GD, the actual address of the GOT entry. */ break; case R_CRIS_32_IE: if (info->shared) { bfd_set_error (bfd_error_invalid_operation); /* We've already informed in cris_elf_check_relocs that this is an error. */ return FALSE; } /* Fall through. */ case R_CRIS_32_GOT_TPREL: case R_CRIS_16_GOT_TPREL: if (rel->r_addend != 0) { /* We can't do anything for a relocation which is against a symbol *plus offset*. GOT holds relocations for symbols. Make this an error; the compiler isn't allowed to pass us these kinds of things. */ (*_bfd_error_handler) (_("%B, section %A: relocation %s with non-zero addend %d" " against symbol `%s'"), input_bfd, input_section, cris_elf_howto_table[r_type].name, rel->r_addend, symname[0] != '\0' ? symname : _("[whose name is lost]")); bfd_set_error (bfd_error_bad_value); return FALSE; } if (!info->shared && (h == NULL || h->def_regular)) { /* Known contents of the GOT. */ bfd_vma off; /* The symbol is defined in the program, so just write the -prog_tls_size+known_tpoffset into the GOT. */ relocation -= elf_hash_table (info)->tls_sec->vma; relocation -= elf_hash_table (info)->tls_size; if (h != NULL) off = h->got.offset; else off = local_got_offsets[r_symndx]; /* Bit 0 is used to mark whether we've emitted the required entry (and if needed R_CRIS_32_TPREL reloc). Bit 1 is used similarly for R_CRIS_DTP, see above. */ if ((off & 1) == 0) { off &= ~3; if (h != NULL) h->got.offset |= 1; else local_got_offsets[r_symndx] |= 1; bfd_put_32 (output_bfd, relocation, sgot->contents + off); } else off &= ~3; relocation = sgot->output_offset + off + (r_type == R_CRIS_32_IE ? sgot->output_section->vma : 0); } else { /* Emit a real relocation. */ bfd_vma off; if (h != NULL) off = h->got.offset; else off = local_got_offsets[r_symndx]; /* See above re usage of bit 0 and 1. */ if ((off & 1) == 0) { Elf_Internal_Rela outrel; bfd_byte *loc; off &= ~3; if (h != NULL) h->got.offset |= 1; else local_got_offsets[r_symndx] |= 1; if (srelgot == NULL) srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); BFD_ASSERT (srelgot != NULL); if (h != NULL && h->dynindx != -1) { outrel.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_32_TPREL); relocation = 0; } else { outrel.r_info = ELF32_R_INFO (0, R_CRIS_32_TPREL); /* NULL if we had an error. */ relocation -= elf_hash_table (info)->tls_sec == NULL ? 0 : elf_hash_table (info)->tls_sec->vma; } /* Just "define" the initial contents in some semi-logical way. */ bfd_put_32 (output_bfd, relocation, sgot->contents + off); outrel.r_offset = (sgot->output_section->vma + sgot->output_offset + off); outrel.r_addend = relocation; loc = srelgot->contents; loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); /* NULL if we had an error. */ if (srelgot->contents != NULL) bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); } else off &= ~3; relocation = sgot->output_offset + off + (r_type == R_CRIS_32_IE ? sgot->output_section->vma : 0); } /* The GOT-relative offset to the GOT entry is the relocation, or for R_CRIS_32_GD, the actual address of the GOT entry. */ break; case R_CRIS_16_TPREL: case R_CRIS_32_TPREL: /* This relocation must only be performed against symbols defined in an ordinary (non-DSO) object. */ if (info->shared) { bfd_set_error (bfd_error_invalid_operation); /* We've already informed in cris_elf_check_relocs that this is an error. */ return FALSE; } if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT && !(h->def_regular || ELF_COMMON_DEF_P (h)) /* If it's undefined, then an error message has already been emitted. */ && h->root.type != bfd_link_hash_undefined) { (*_bfd_error_handler) (_("%B, section %A: relocation %s is" " not allowed for symbol: `%s'" " which is defined outside the program," " perhaps a declaration mixup?"), input_bfd, input_section, cris_elf_howto_table[r_type].name, symname); bfd_set_error (bfd_error_bad_value); return FALSE; } /* NULL if we had an error. */ relocation -= elf_hash_table (info)->tls_sec == NULL ? 0 : (elf_hash_table (info)->tls_sec->vma + elf_hash_table (info)->tls_size); /* The TLS-relative offset is the relocation. */ break; default: BFD_FAIL (); return FALSE; } r = cris_final_link_relocate (howto, input_bfd, input_section, contents, rel, relocation); if (r != bfd_reloc_ok) { const char * msg = (const char *) NULL; switch (r) { case bfd_reloc_overflow: r = info->callbacks->reloc_overflow (info, (h ? &h->root : NULL), symname, howto->name, (bfd_vma) 0, input_bfd, input_section, rel->r_offset); if (additional_relocation_error_msg_count > 0) { additional_relocation_error_msg_count--; switch (r_type) { case R_CRIS_16_GOTPLT: case R_CRIS_16_GOT: /* Not just TLS is involved here, so we make generation and message depend on -fPIC/-fpic only. */ case R_CRIS_16_GOT_TPREL: case R_CRIS_16_GOT_GD: (*_bfd_error_handler) (_("(too many global variables for -fpic:" " recompile with -fPIC)")); break; case R_CRIS_16_TPREL: case R_CRIS_16_DTPREL: (*_bfd_error_handler) (_("(thread-local data too big for -fpic or" " -msmall-tls: recompile with -fPIC or" " -mno-small-tls)")); break; /* No known cause for overflow for other relocs. */ default: break; } } break; case bfd_reloc_undefined: r = info->callbacks->undefined_symbol (info, symname, input_bfd, input_section, rel->r_offset, TRUE); break; case bfd_reloc_outofrange: msg = _("internal error: out of range error"); break; case bfd_reloc_notsupported: msg = _("internal error: unsupported relocation error"); break; case bfd_reloc_dangerous: msg = _("internal error: dangerous relocation"); break; default: msg = _("internal error: unknown error"); break; } if (msg) r = info->callbacks->warning (info, msg, symname, input_bfd, input_section, rel->r_offset); if (! r) return FALSE; } } return TRUE; } /* Finish up dynamic symbol handling. We set the contents of various dynamic sections here. */ static bfd_boolean elf_cris_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info, struct elf_link_hash_entry *h, Elf_Internal_Sym *sym) { struct elf_cris_link_hash_table * htab; bfd *dynobj; /* Where in the plt entry to put values. */ int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16; /* What offset to add to the distance to the first PLT entry for the value at plt_off3. */ int plt_off3_value_bias = 4; /* Where in the PLT entry the call-dynlink-stub is (happens to be same for PIC and non-PIC for v32 and pre-v32). */ int plt_stub_offset = 8; int plt_entry_size = PLT_ENTRY_SIZE; const bfd_byte *plt_entry = elf_cris_plt_entry; const bfd_byte *plt_pic_entry = elf_cris_pic_plt_entry; htab = elf_cris_hash_table (info); if (htab == NULL) return FALSE; /* Adjust the various PLT entry offsets. */ if (bfd_get_mach (output_bfd) == bfd_mach_cris_v32) { plt_off2 = 14; plt_off3 = 20; plt_off3_value_bias = -2; plt_stub_offset = 12; plt_entry_size = PLT_ENTRY_SIZE_V32; plt_entry = elf_cris_plt_entry_v32; plt_pic_entry = elf_cris_pic_plt_entry_v32; } dynobj = elf_hash_table (info)->dynobj; if (h->plt.offset != (bfd_vma) -1) { asection *splt; asection *sgotplt; asection *sgot; asection *srela; bfd_vma got_base; bfd_vma gotplt_offset = elf_cris_hash_entry (h)->gotplt_offset; Elf_Internal_Rela rela; bfd_byte *loc; bfd_boolean has_gotplt = gotplt_offset != 0; /* Get the index in the .rela.plt relocations for the .got.plt entry that corresponds to this symbol. We have to count backwards here, and the result is only valid as an index into .rela.plt. We also have to undo the effect of the R_CRIS_DTPMOD entry at .got index 3 (offset 12 into .got.plt) for which gotplt_offset is adjusted, because while that entry goes into .got.plt, its relocation goes into .rela.got, not .rela.plt. (It's not PLT-specific; not to be processed as part of the runtime lazy .rela.plt relocation). FIXME: There be literal constants here... */ bfd_vma rela_plt_index = (htab->dtpmod_refcount != 0 ? gotplt_offset/4 - 2 - 3 : gotplt_offset/4 - 3); /* Get the offset into the .got table of the entry that corresponds to this function. Note that we embed knowledge that "incoming" .got goes after .got.plt in the output without padding (pointer aligned). However, that knowledge is present in several other places too. */ bfd_vma got_offset = (has_gotplt ? gotplt_offset : h->got.offset + htab->next_gotplt_entry); /* This symbol has an entry in the procedure linkage table. Set it up. */ BFD_ASSERT (h->dynindx != -1); splt = bfd_get_section_by_name (dynobj, ".plt"); sgot = bfd_get_section_by_name (dynobj, ".got"); sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); srela = bfd_get_section_by_name (dynobj, ".rela.plt"); BFD_ASSERT (splt != NULL && sgotplt != NULL && (! has_gotplt || srela != NULL)); got_base = sgotplt->output_section->vma + sgotplt->output_offset; /* Fill in the entry in the procedure linkage table. */ if (! info->shared) { memcpy (splt->contents + h->plt.offset, plt_entry, plt_entry_size); /* We need to enter the absolute address of the GOT entry here. */ bfd_put_32 (output_bfd, got_base + got_offset, splt->contents + h->plt.offset + plt_off1); } else { memcpy (splt->contents + h->plt.offset, plt_pic_entry, plt_entry_size); bfd_put_32 (output_bfd, got_offset, splt->contents + h->plt.offset + plt_off1); } /* Fill in the plt entry and make a relocation, if this is a "real" PLT entry. */ if (has_gotplt) { /* Fill in the offset to the reloc table. */ bfd_put_32 (output_bfd, rela_plt_index * sizeof (Elf32_External_Rela), splt->contents + h->plt.offset + plt_off2); /* Fill in the offset to the first PLT entry, where to "jump". */ bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3 + plt_off3_value_bias), splt->contents + h->plt.offset + plt_off3); /* Fill in the entry in the global offset table with the address of the relocating stub. */ bfd_put_32 (output_bfd, (splt->output_section->vma + splt->output_offset + h->plt.offset + plt_stub_offset), sgotplt->contents + got_offset); /* Fill in the entry in the .rela.plt section. */ rela.r_offset = (sgotplt->output_section->vma + sgotplt->output_offset + got_offset); rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_JUMP_SLOT); rela.r_addend = 0; loc = srela->contents + rela_plt_index * sizeof (Elf32_External_Rela); bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); } if (!h->def_regular) { /* Mark the symbol as undefined, rather than as defined in the .plt section. Leave the value alone. */ sym->st_shndx = SHN_UNDEF; /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't know whether resetting the value is significant; if it really is, rather than a quirk or bug in the sparc port, then I believe we'd see this elsewhere. */ /* If the symbol is weak, we do need to clear the value. Otherwise, the PLT entry would provide a definition for the symbol even if the symbol wasn't defined anywhere, and so the symbol would never be NULL. */ if (!h->ref_regular_nonweak) sym->st_value = 0; } } /* For an ordinary program, we emit .got relocs only for symbols that are in the dynamic-symbols table and are either defined by the program or are undefined weak symbols, or are function symbols where we do not output a PLT: the PLT reloc was output above and all references to the function symbol are redirected to the PLT. */ if (h->got.offset != (bfd_vma) -1 && (elf_cris_hash_entry (h)->reg_got_refcount > 0) && (info->shared || (h->dynindx != -1 && h->plt.offset == (bfd_vma) -1 && !h->def_regular && h->root.type != bfd_link_hash_undefweak))) { asection *sgot; asection *srela; Elf_Internal_Rela rela; bfd_byte *loc; bfd_byte *where; /* This symbol has an entry in the global offset table. Set it up. */ sgot = bfd_get_section_by_name (dynobj, ".got"); srela = bfd_get_section_by_name (dynobj, ".rela.got"); BFD_ASSERT (sgot != NULL && srela != NULL); rela.r_offset = (sgot->output_section->vma + 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. */ where = sgot->contents + (h->got.offset &~ (bfd_vma) 1); if (! elf_hash_table (info)->dynamic_sections_created || (info->shared && (info->symbolic || h->dynindx == -1) && h->def_regular)) { rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); rela.r_addend = bfd_get_signed_32 (output_bfd, where); } else { bfd_put_32 (output_bfd, (bfd_vma) 0, where); rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT); rela.r_addend = 0; } loc = srela->contents; loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); } if (h->needs_copy) { asection *s; Elf_Internal_Rela rela; bfd_byte *loc; /* This symbol needs a copy reloc. Set it up. */ BFD_ASSERT (h->dynindx != -1 && (h->root.type == bfd_link_hash_defined || h->root.type == bfd_link_hash_defweak)); s = bfd_get_section_by_name (h->root.u.def.section->owner, ".rela.bss"); BFD_ASSERT (s != NULL); rela.r_offset = (h->root.u.def.value + h->root.u.def.section->output_section->vma + h->root.u.def.section->output_offset); rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_COPY); rela.r_addend = 0; loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); } /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ if (strcmp (h->root.root.string, "_DYNAMIC") == 0 || h == elf_hash_table (info)->hgot) sym->st_shndx = SHN_ABS; return TRUE; } /* Finish up the dynamic sections. Do *not* emit relocs here, as their offsets were changed, as part of -z combreloc handling, from those we computed. */ static bfd_boolean elf_cris_finish_dynamic_sections (output_bfd, info) bfd *output_bfd; struct bfd_link_info *info; { bfd *dynobj; asection *sgot; asection *sdyn; dynobj = elf_hash_table (info)->dynobj; sgot = bfd_get_section_by_name (dynobj, ".got.plt"); BFD_ASSERT (sgot != NULL); sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); if (elf_hash_table (info)->dynamic_sections_created) { asection *splt; Elf32_External_Dyn *dyncon, *dynconend; splt = bfd_get_section_by_name (dynobj, ".plt"); BFD_ASSERT (splt != NULL && sdyn != NULL); dyncon = (Elf32_External_Dyn *) sdyn->contents; dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); for (; dyncon < dynconend; dyncon++) { Elf_Internal_Dyn dyn; asection *s; bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); switch (dyn.d_tag) { default: break; case DT_PLTGOT: s = bfd_get_section_by_name (output_bfd, ".got"); BFD_ASSERT (s != NULL); dyn.d_un.d_ptr = s->vma; bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); break; case DT_JMPREL: /* Yes, we *can* have a .plt and no .plt.rela, for instance if all symbols are found in the .got (not .got.plt). */ s = bfd_get_section_by_name (output_bfd, ".rela.plt"); dyn.d_un.d_ptr = s != NULL ? s->vma : 0; bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); break; case DT_PLTRELSZ: s = bfd_get_section_by_name (output_bfd, ".rela.plt"); if (s == NULL) dyn.d_un.d_val = 0; else dyn.d_un.d_val = s->size; bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); break; case DT_RELASZ: /* The procedure linkage table relocs (DT_JMPREL) should not be included in the overall relocs (DT_RELA). Therefore, we override the DT_RELASZ entry here to make it not include the JMPREL relocs. Since the linker script arranges for .rela.plt to follow all other relocation sections, we don't have to worry about changing the DT_RELA entry. */ s = bfd_get_section_by_name (output_bfd, ".rela.plt"); if (s != NULL) dyn.d_un.d_val -= s->size; bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); break; } } /* Fill in the first entry in the procedure linkage table. */ if (splt->size > 0) { if (bfd_get_mach (output_bfd) == bfd_mach_cris_v32) { if (info->shared) memcpy (splt->contents, elf_cris_pic_plt0_entry_v32, PLT_ENTRY_SIZE_V32); else { memcpy (splt->contents, elf_cris_plt0_entry_v32, PLT_ENTRY_SIZE_V32); bfd_put_32 (output_bfd, sgot->output_section->vma + sgot->output_offset + 4, splt->contents + 4); elf_section_data (splt->output_section)->this_hdr.sh_entsize = PLT_ENTRY_SIZE_V32; } } else { if (info->shared) memcpy (splt->contents, elf_cris_pic_plt0_entry, PLT_ENTRY_SIZE); else { memcpy (splt->contents, elf_cris_plt0_entry, PLT_ENTRY_SIZE); bfd_put_32 (output_bfd, sgot->output_section->vma + sgot->output_offset + 4, splt->contents + 6); bfd_put_32 (output_bfd, sgot->output_section->vma + sgot->output_offset + 8, splt->contents + 14); elf_section_data (splt->output_section)->this_hdr.sh_entsize = PLT_ENTRY_SIZE; } } } } /* Fill in the first three entries in the global offset table. */ if (sgot->size > 0) { if (sdyn == NULL) bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); else bfd_put_32 (output_bfd, sdyn->output_section->vma + sdyn->output_offset, sgot->contents); bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); } elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; return TRUE; } /* Return the section that should be marked against GC for a given relocation. */ static asection * cris_elf_gc_mark_hook (asection *sec, struct bfd_link_info *info, Elf_Internal_Rela *rel, struct elf_link_hash_entry *h, Elf_Internal_Sym *sym) { enum elf_cris_reloc_type r_type = ELF32_R_TYPE (rel->r_info); if (h != NULL) switch (r_type) { case R_CRIS_GNU_VTINHERIT: case R_CRIS_GNU_VTENTRY: return NULL; default: break; } return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); } /* Update the got entry reference counts for the section being removed. */ static bfd_boolean cris_elf_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, asection *sec, const Elf_Internal_Rela *relocs) { struct elf_cris_link_hash_table * htab; Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; bfd_signed_vma *local_got_refcounts; const Elf_Internal_Rela *rel, *relend; bfd *dynobj; asection *sgot; asection *srelgot; if (info->relocatable) return TRUE; dynobj = elf_hash_table (info)->dynobj; if (dynobj == NULL) return TRUE; htab = elf_cris_hash_table (info); if (htab == NULL) return FALSE; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; sym_hashes = elf_sym_hashes (abfd); local_got_refcounts = elf_local_got_refcounts (abfd); sgot = bfd_get_section_by_name (dynobj, ".got"); srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); relend = relocs + sec->reloc_count; for (rel = relocs; rel < relend; rel++) { unsigned long r_symndx; struct elf_link_hash_entry *h = NULL; bfd_signed_vma got_element_size = 4; bfd_signed_vma *specific_refcount = NULL; enum elf_cris_reloc_type r_type; r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx >= symtab_hdr->sh_info) { h = sym_hashes[r_symndx - symtab_hdr->sh_info]; while (h->root.type == bfd_link_hash_indirect || h->root.type == bfd_link_hash_warning) h = (struct elf_link_hash_entry *) h->root.u.i.link; } r_type = ELF32_R_TYPE (rel->r_info); switch (r_type) { case R_CRIS_32_GOT: case R_CRIS_16_GOT: case R_CRIS_16_GOTPLT: case R_CRIS_32_GOTPLT: specific_refcount = h != NULL ? &((struct elf_cris_link_hash_entry *) h)->reg_got_refcount : &local_got_refcounts[LGOT_REG_NDX (r_symndx)]; break; case R_CRIS_32_GD: case R_CRIS_32_GOT_GD: case R_CRIS_16_GOT_GD: got_element_size = 8; specific_refcount = h != NULL ? &((struct elf_cris_link_hash_entry *) h)->dtp_refcount : &local_got_refcounts[LGOT_DTP_NDX (r_symndx)]; break; case R_CRIS_32_IE: case R_CRIS_16_GOT_TPREL: case R_CRIS_32_GOT_TPREL: specific_refcount = h != NULL ? &((struct elf_cris_link_hash_entry *) h)->tprel_refcount : &local_got_refcounts[LGOT_TPREL_NDX (r_symndx)]; break; default: break; } switch (r_type) { case R_CRIS_32_IE: case R_CRIS_32_GD: case R_CRIS_16_GOT_TPREL: case R_CRIS_32_GOT_TPREL: case R_CRIS_32_GOT_GD: case R_CRIS_16_GOT_GD: case R_CRIS_16_GOT: case R_CRIS_32_GOT: if (h != NULL) { /* If the counters are 0 when we got here, we've miscounted somehow somewhere, an internal error. */ BFD_ASSERT (h->got.refcount > 0); --h->got.refcount; BFD_ASSERT (*specific_refcount > 0); --*specific_refcount; if (*specific_refcount == 0) { /* We don't need the .got entry any more. */ sgot->size -= got_element_size; srelgot->size -= sizeof (Elf32_External_Rela); } break; } local_got_reloc: if (local_got_refcounts != NULL) { /* If the counters are 0 when we got here, we've miscounted somehow somewhere, an internal error. */ BFD_ASSERT (local_got_refcounts[r_symndx] > 0); --local_got_refcounts[r_symndx]; BFD_ASSERT (*specific_refcount > 0); --*specific_refcount; if (*specific_refcount == 0) { /* We don't need the .got entry any more. */ sgot->size -= got_element_size; if (info->shared) srelgot->size -= sizeof (Elf32_External_Rela); } } break; case R_CRIS_16_GOTPLT: case R_CRIS_32_GOTPLT: /* For local symbols, treat these like GOT relocs. */ if (h == NULL) goto local_got_reloc; /* Fall through. */ case R_CRIS_32_PLT_GOTREL: /* FIXME: We don't garbage-collect away the .got section. */ if (local_got_refcounts != NULL) local_got_refcounts[-1]--; /* Fall through. */ case R_CRIS_8_PCREL: case R_CRIS_16_PCREL: case R_CRIS_32_PCREL: case R_CRIS_32_PLT_PCREL: if (h != NULL) { if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT && h->plt.refcount > 0) --h->plt.refcount; } break; case R_CRIS_32_DTPREL: /* This'd be a .dtpreld entry in e.g. debug info. */ if ((sec->flags & SEC_ALLOC) == 0) break; /* Fall through. */ case R_CRIS_16_DTPREL: htab->dtpmod_refcount--; if (htab->dtpmod_refcount == 0) htab->next_gotplt_entry -= 8; BFD_ASSERT (local_got_refcounts != NULL); local_got_refcounts[-1]--; break; default: break; } } return TRUE; } /* The elf_backend_plt_sym_val hook function. */ static bfd_vma cris_elf_plt_sym_val (bfd_vma i, const asection *plt, const arelent *rel ATTRIBUTE_UNUSED) { bfd_size_type plt_entry_size; plt_entry_size = (bfd_get_mach (plt->owner) == bfd_mach_cris_v32 ? PLT_ENTRY_SIZE_V32 : PLT_ENTRY_SIZE); return plt->vma + (i + 1) * plt_entry_size; } /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT entry but we found we will not create any. Called when we find we will not have any PLT for this symbol, by for example elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link, or elf_cris_size_dynamic_sections if no dynamic sections will be created (we're only linking static objects). */ static bfd_boolean elf_cris_adjust_gotplt_to_got (h, p) struct elf_cris_link_hash_entry *h; PTR p; { struct bfd_link_info *info = (struct bfd_link_info *) p; if (h->root.root.type == bfd_link_hash_warning) h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link; /* If nobody wanted a GOTPLT with this symbol, we're done. */ if (h->gotplt_refcount <= 0) return TRUE; if (h->reg_got_refcount > 0) { /* There's a GOT entry for this symbol. Just adjust the refcounts. Probably not necessary at this stage, but keeping them accurate helps avoiding surprises later. */ h->root.got.refcount += h->gotplt_refcount; h->reg_got_refcount += h->gotplt_refcount; h->gotplt_refcount = 0; } else { /* No GOT entry for this symbol. We need to create one. */ bfd *dynobj = elf_hash_table (info)->dynobj; asection *sgot; asection *srelgot; BFD_ASSERT (dynobj != NULL); sgot = bfd_get_section_by_name (dynobj, ".got"); srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); /* Put accurate refcounts there. */ h->root.got.refcount += h->gotplt_refcount; h->reg_got_refcount = h->gotplt_refcount; h->gotplt_refcount = 0; /* We always have a .got and a .rela.got section if there were GOTPLT relocs in input. */ BFD_ASSERT (sgot != NULL && srelgot != NULL); /* Allocate space in the .got section. */ sgot->size += 4; /* Allocate relocation space. */ srelgot->size += sizeof (Elf32_External_Rela); } return TRUE; } /* Try to fold PLT entries with GOT entries. There are two cases when we want to do this: - When all PLT references are GOTPLT references, and there are GOT references, and this is not the executable. We don't have to generate a PLT at all. - When there are both (ordinary) PLT references and GOT references, and this isn't the executable. We want to make the PLT reference use the ordinary GOT entry rather than R_CRIS_JUMP_SLOT, a run-time dynamically resolved GOTPLT entry, since the GOT entry will have to be resolved at startup anyway. Though the latter case is handled when room for the PLT is allocated, not here. By folding into the GOT, we may need a round-trip to a PLT in the executable for calls, a loss in performance. Still, losing a reloc is a win in size and at least in start-up time. Note that this function is called before symbols are forced local by version scripts. The differing cases are handled by elf_cris_hide_symbol. */ static bfd_boolean elf_cris_try_fold_plt_to_got (h, p) struct elf_cris_link_hash_entry *h; PTR p; { struct bfd_link_info *info = (struct bfd_link_info *) p; /* If there are no GOT references for this symbol, we can't fold any other reference so there's nothing to do. Likewise if there are no PLT references; GOTPLT references included. */ if (h->root.got.refcount <= 0 || h->root.plt.refcount <= 0) return TRUE; /* GOTPLT relocs are supposed to be included into the PLT refcount. */ BFD_ASSERT (h->gotplt_refcount <= h->root.plt.refcount); if (h->gotplt_refcount == h->root.plt.refcount) { /* The only PLT references are GOTPLT references, and there are GOT references. Convert PLT to GOT references. */ if (! elf_cris_adjust_gotplt_to_got (h, info)) return FALSE; /* Clear the PLT references, so no PLT will be created. */ h->root.plt.offset = (bfd_vma) -1; } return TRUE; } /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc to use a GOT entry (and create one) rather than requiring a GOTPLT entry. */ static void elf_cris_hide_symbol (info, h, force_local) struct bfd_link_info *info; struct elf_link_hash_entry *h; bfd_boolean force_local; { elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info); _bfd_elf_link_hash_hide_symbol (info, h, force_local); } /* Adjust a symbol defined by a dynamic object and referenced by a regular object. The current definition is in some section of the dynamic object, but we're not including those sections. We have to change the definition to something the rest of the link can understand. */ static bfd_boolean elf_cris_adjust_dynamic_symbol (struct bfd_link_info *info, struct elf_link_hash_entry *h) { struct elf_cris_link_hash_table * htab; bfd *dynobj; asection *s; bfd_size_type plt_entry_size; htab = elf_cris_hash_table (info); if (htab == NULL) return FALSE; dynobj = elf_hash_table (info)->dynobj; /* Make sure we know what is going on here. */ BFD_ASSERT (dynobj != NULL && (h->needs_plt || h->u.weakdef != NULL || (h->def_dynamic && h->ref_regular && !h->def_regular))); plt_entry_size = (bfd_get_mach (dynobj) == bfd_mach_cris_v32 ? PLT_ENTRY_SIZE_V32 : PLT_ENTRY_SIZE); /* If this is a function, put it in the procedure linkage table. We will fill in the contents of the procedure linkage table later, when we know the address of the .got section. */ if (h->type == STT_FUNC || h->needs_plt) { /* If we link a program (not a DSO), we'll get rid of unnecessary PLT entries; we point to the actual symbols -- even for pic relocs, because a program built with -fpic should have the same result as one built without -fpic, specifically considering weak symbols. FIXME: m68k and i386 differ here, for unclear reasons. */ if (! info->shared && !h->def_dynamic) { /* This case can occur if we saw a PLT reloc in an input file, but the symbol was not defined by a dynamic object. In such a case, we don't actually need to build a procedure linkage table, and we can just do an absolute or PC reloc instead, or change a .got.plt index to a .got index for GOTPLT relocs. */ BFD_ASSERT (h->needs_plt); h->needs_plt = 0; h->plt.offset = (bfd_vma) -1; return elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info); } /* If we had a R_CRIS_GLOB_DAT that didn't have to point to a PLT; where a pointer-equivalent symbol was unimportant (i.e. more like R_CRIS_JUMP_SLOT after symbol evaluation) we could get rid of the PLT. We can't for the executable, because the GOT entries will point to the PLT there (and be constant). */ if (info->shared && !elf_cris_try_fold_plt_to_got ((struct elf_cris_link_hash_entry*) h, info)) return FALSE; /* GC or folding may have rendered this entry unused. */ if (h->plt.refcount <= 0) { h->needs_plt = 0; h->plt.offset = (bfd_vma) -1; return TRUE; } /* Make sure this symbol is output as a dynamic symbol. */ if (h->dynindx == -1) { if (! bfd_elf_link_record_dynamic_symbol (info, h)) return FALSE; } s = bfd_get_section_by_name (dynobj, ".plt"); BFD_ASSERT (s != NULL); /* If this is the first .plt entry, make room for the special first entry. */ if (s->size == 0) s->size += plt_entry_size; /* If this symbol is not defined in a regular file, and we are not generating a shared library, then set the symbol to this location in the .plt. */ if (!info->shared && !h->def_regular) { h->root.u.def.section = s; h->root.u.def.value = s->size; } /* If there's already a GOT entry, use that, not a .got.plt. A GOT field still has a reference count when we get here; it's not yet changed to an offset. We can't do this for an executable, because then the reloc associated with the PLT would get a non-PLT reloc pointing to the PLT. FIXME: Move this to elf_cris_try_fold_plt_to_got. */ if (info->shared && h->got.refcount > 0) { h->got.refcount += h->plt.refcount; /* Mark the PLT offset to use the GOT entry by setting the low bit in the plt offset; it is always a multiple of plt_entry_size (which is at least a multiple of 2). */ BFD_ASSERT ((s->size % plt_entry_size) == 0); /* Change the PLT refcount to an offset. */ h->plt.offset = s->size; /* By not setting gotplt_offset (i.e. it remains at 0), we signal that the got entry should be used instead. */ BFD_ASSERT (((struct elf_cris_link_hash_entry *) h)->gotplt_offset == 0); /* Make room for this entry. */ s->size += plt_entry_size; return TRUE; } /* No GOT reference for this symbol; prepare for an ordinary PLT. */ h->plt.offset = s->size; /* Make room for this entry. */ s->size += plt_entry_size; /* We also need to make an entry in the .got.plt section, which will be placed in the .got section by the linker script. */ ((struct elf_cris_link_hash_entry *) h)->gotplt_offset = htab->next_gotplt_entry; htab->next_gotplt_entry += 4; s = bfd_get_section_by_name (dynobj, ".got.plt"); BFD_ASSERT (s != NULL); s->size += 4; /* We also need to make an entry in the .rela.plt section. */ s = bfd_get_section_by_name (dynobj, ".rela.plt"); BFD_ASSERT (s != NULL); s->size += sizeof (Elf32_External_Rela); return TRUE; } /* Reinitialize the plt offset now that it is not used as a reference count any more. */ h->plt.offset = (bfd_vma) -1; /* If this is a weak symbol, and there is a real definition, the processor independent code will have arranged for us to see the real definition first, and we can just use the same value. */ if (h->u.weakdef != NULL) { BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined || h->u.weakdef->root.type == bfd_link_hash_defweak); h->root.u.def.section = h->u.weakdef->root.u.def.section; h->root.u.def.value = h->u.weakdef->root.u.def.value; return TRUE; } /* This is a reference to a symbol defined by a dynamic object which is not a function. */ /* If we are creating a shared library, we must presume that the only references to the symbol are via the global offset table. For such cases we need not do anything here; the relocations will be handled correctly by relocate_section. */ if (info->shared) return TRUE; /* If there are no references to this symbol that do not use the GOT, we don't need to generate a copy reloc. */ if (!h->non_got_ref) return TRUE; if (h->size == 0) { (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), h->root.root.string); return TRUE; } /* We must allocate the symbol in our .dynbss section, which will become part of the .bss section of the executable. There will be an entry for this symbol in the .dynsym section. The dynamic object will contain position independent code, so all references from the dynamic object to this symbol will go through the global offset table. The dynamic linker will use the .dynsym entry to determine the address it must put in the global offset table, so both the dynamic object and the regular object will refer to the same memory location for the variable. */ s = bfd_get_section_by_name (dynobj, ".dynbss"); BFD_ASSERT (s != NULL); /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to copy the initial value out of the dynamic object and into the runtime process image. We need to remember the offset into the .rela.bss section we are going to use. */ if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) { asection *srel; srel = bfd_get_section_by_name (dynobj, ".rela.bss"); BFD_ASSERT (srel != NULL); srel->size += sizeof (Elf32_External_Rela); h->needs_copy = 1; } return _bfd_elf_adjust_dynamic_copy (h, s); } /* Adjust our "subclass" elements for an indirect symbol. */ static void elf_cris_copy_indirect_symbol (struct bfd_link_info *info, struct elf_link_hash_entry *dir, struct elf_link_hash_entry *ind) { struct elf_cris_link_hash_entry *edir, *eind; edir = (struct elf_cris_link_hash_entry *) dir; eind = (struct elf_cris_link_hash_entry *) ind; /* Only indirect symbols are replaced; we're not interested in updating any of EIND's fields for other symbols. */ if (eind->root.root.type != bfd_link_hash_indirect) { /* Still, we need to copy flags for e.g. weak definitions. */ _bfd_elf_link_hash_copy_indirect (info, dir, ind); return; } BFD_ASSERT (edir->pcrel_relocs_copied == NULL); BFD_ASSERT (edir->gotplt_offset == 0 || eind->gotplt_offset == 0); #define XMOVOPZ(F, OP, Z) edir->F OP eind->F; eind->F = Z #define XMOVE(F) XMOVOPZ (F, +=, 0) XMOVOPZ (pcrel_relocs_copied, =, NULL); XMOVE (gotplt_refcount); XMOVE (gotplt_offset); XMOVE (reg_got_refcount); XMOVE (tprel_refcount); XMOVE (dtp_refcount); #undef XMOVE #undef XMOVOPZ _bfd_elf_link_hash_copy_indirect (info, dir, ind); } /* Look through the relocs for a section during the first phase. */ static bfd_boolean cris_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, const Elf_Internal_Rela *relocs) { struct elf_cris_link_hash_table * htab; bfd *dynobj; Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; bfd_signed_vma *local_got_refcounts; const Elf_Internal_Rela *rel; const Elf_Internal_Rela *rel_end; asection *sgot; asection *srelgot; asection *sreloc; if (info->relocatable) return TRUE; htab = elf_cris_hash_table (info); if (htab == NULL) return FALSE; dynobj = elf_hash_table (info)->dynobj; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; sym_hashes = elf_sym_hashes (abfd); local_got_refcounts = elf_local_got_refcounts (abfd); sgot = NULL; srelgot = NULL; sreloc = NULL; rel_end = relocs + sec->reloc_count; for (rel = relocs; rel < rel_end; rel++) { struct elf_link_hash_entry *h; unsigned long r_symndx; enum elf_cris_reloc_type r_type; bfd_signed_vma got_element_size = 4; unsigned long r_symndx_lgot = INT_MAX; r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx < symtab_hdr->sh_info) { h = NULL; r_symndx_lgot = LGOT_REG_NDX (r_symndx); } else { h = sym_hashes[r_symndx - symtab_hdr->sh_info]; while (h->root.type == bfd_link_hash_indirect || h->root.type == bfd_link_hash_warning) h = (struct elf_link_hash_entry *) h->root.u.i.link; } r_type = ELF32_R_TYPE (rel->r_info); /* Some relocs require linker-created sections; we need to hang them on the first input bfd we found that contained dynamic relocs. */ switch (r_type) { case R_CRIS_32_DTPREL: if ((sec->flags & SEC_ALLOC) == 0) /* This'd be a .dtpreld entry in e.g. debug info. We have several different switch statements below, but none of that is needed; we need no preparations for resolving R_CRIS_32_DTPREL into a non-allocated section (debug info), so let's just move on to the next relocation. */ continue; /* Fall through. */ case R_CRIS_16_DTPREL: /* The first .got.plt entry is right after the R_CRIS_DTPMOD entry at index 3. */ if (htab->dtpmod_refcount == 0) htab->next_gotplt_entry += 8; htab->dtpmod_refcount++; /* Fall through. */ case R_CRIS_32_IE: case R_CRIS_32_GD: case R_CRIS_16_GOT_GD: case R_CRIS_32_GOT_GD: case R_CRIS_32_GOT_TPREL: case R_CRIS_16_GOT_TPREL: case R_CRIS_16_GOT: case R_CRIS_32_GOT: case R_CRIS_32_GOTREL: case R_CRIS_32_PLT_GOTREL: case R_CRIS_32_PLT_PCREL: case R_CRIS_16_GOTPLT: case R_CRIS_32_GOTPLT: if (dynobj == NULL) { elf_hash_table (info)->dynobj = dynobj = abfd; /* We could handle this if we can get a handle on the output bfd in elf_cris_adjust_dynamic_symbol. Failing that, we must insist on dynobj being a specific mach. */ if (bfd_get_mach (dynobj) == bfd_mach_cris_v10_v32) { (*_bfd_error_handler) (_("%B, section %A:\n v10/v32 compatible object %s" " must not contain a PIC relocation"), abfd, sec); return FALSE; } /* Create the .got section, so we can assume it's always present whenever there's a dynobj. */ if (!_bfd_elf_create_got_section (dynobj, info)) return FALSE; } if (sgot == NULL) sgot = bfd_get_section_by_name (dynobj, ".got"); if (local_got_refcounts == NULL) { bfd_size_type amt; /* We use index local_got_refcounts[-1] to count all GOT-relative relocations that do not have explicit GOT entries. */ amt = LGOT_ALLOC_NELTS_FOR (symtab_hdr->sh_info) + 1; amt *= sizeof (bfd_signed_vma); local_got_refcounts = ((bfd_signed_vma *) bfd_zalloc (abfd, amt)); if (local_got_refcounts == NULL) return FALSE; local_got_refcounts++; elf_local_got_refcounts (abfd) = local_got_refcounts; } break; default: break; } /* Some relocs require a global offset table (but perhaps not a specific GOT entry). */ switch (r_type) { case R_CRIS_16_DTPREL: case R_CRIS_32_DTPREL: /* Not requesting .got.rela for an executable: the contents of the first entry is constant there. For a shared library, we need .got.rela for the R_CRIS_DTPMOD relocation at index 3. */ if (!info->shared) break; /* Fall through. */ case R_CRIS_32_IE: case R_CRIS_32_GD: case R_CRIS_16_GOT_GD: case R_CRIS_32_GOT_GD: case R_CRIS_32_GOT_TPREL: case R_CRIS_16_GOT_TPREL: /* Fall through. */ /* For R_CRIS_16_GOTPLT and R_CRIS_32_GOTPLT, we need a GOT entry only for local symbols. Unfortunately, we don't know until later on if there's a version script that forces the symbol local. We must have the .rela.got section in place before we know if the symbol looks global now, so we need to treat the reloc just like for R_CRIS_16_GOT and R_CRIS_32_GOT. */ case R_CRIS_16_GOTPLT: case R_CRIS_32_GOTPLT: case R_CRIS_16_GOT: case R_CRIS_32_GOT: if (srelgot == NULL && (h != NULL || info->shared)) { srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); if (srelgot == NULL) { srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED | SEC_READONLY)); if (srelgot == NULL || !bfd_set_section_alignment (dynobj, srelgot, 2)) return FALSE; } } break; default: break; } /* Warn and error for invalid input. */ switch (r_type) { case R_CRIS_32_IE: case R_CRIS_32_TPREL: case R_CRIS_16_TPREL: case R_CRIS_32_GD: if (info->shared) { (*_bfd_error_handler) (_("%B, section %A:\n relocation %s not valid" " in a shared object;" " typically an option mixup, recompile with -fPIC"), abfd, sec, cris_elf_howto_table[r_type].name); /* Don't return FALSE here; we want messages for all of these and the error behavior is ungraceful anyway. */ } default: break; } switch (r_type) { case R_CRIS_32_GD: case R_CRIS_16_GOT_GD: case R_CRIS_32_GOT_GD: /* These are requests for tls_index entries, run-time R_CRIS_DTP. */ got_element_size = 8; r_symndx_lgot = LGOT_DTP_NDX (r_symndx); break; case R_CRIS_16_DTPREL: case R_CRIS_32_DTPREL: /* These two just request for the constant-index module-local tls_index-sized GOT entry, which we add elsewhere. */ break; case R_CRIS_32_IE: case R_CRIS_32_GOT_TPREL: case R_CRIS_16_GOT_TPREL: r_symndx_lgot = LGOT_TPREL_NDX (r_symndx); /* Those relocs also require that a DSO is of type Initial Exec. Like other targets, we don't reset this flag even if the relocs are GC:ed away. */ if (info->shared) info->flags |= DF_STATIC_TLS; break; /* Let's list the other assembler-generated TLS-relocs too, just to show that they're not forgotten. */ case R_CRIS_16_TPREL: case R_CRIS_32_TPREL: default: break; } switch (r_type) { case R_CRIS_16_GOTPLT: case R_CRIS_32_GOTPLT: /* Mark that we need a GOT entry if the PLT entry (and its GOT entry) is eliminated. We can only do this for a non-local symbol. */ if (h != NULL) { elf_cris_hash_entry (h)->gotplt_refcount++; goto handle_gotplt_reloc; } /* If h is NULL then this is a local symbol, and we must make a GOT entry for it, so handle it like a GOT reloc. */ /* Fall through. */ case R_CRIS_32_IE: case R_CRIS_32_GD: case R_CRIS_16_GOT_GD: case R_CRIS_32_GOT_GD: case R_CRIS_32_GOT_TPREL: case R_CRIS_16_GOT_TPREL: case R_CRIS_16_GOT: case R_CRIS_32_GOT: /* This symbol requires a global offset table entry. */ if (h != NULL) { if (h->got.refcount == 0) { /* Make sure this symbol is output as a dynamic symbol. */ if (h->dynindx == -1) { if (!bfd_elf_link_record_dynamic_symbol (info, h)) return FALSE; } } /* Update the sum of reloc counts for this symbol. */ h->got.refcount++; switch (r_type) { case R_CRIS_16_GOT: case R_CRIS_32_GOT: if (elf_cris_hash_entry (h)->reg_got_refcount == 0) { /* Allocate space in the .got section. */ sgot->size += got_element_size; /* Allocate relocation space. */ srelgot->size += sizeof (Elf32_External_Rela); } elf_cris_hash_entry (h)->reg_got_refcount++; break; case R_CRIS_32_GD: case R_CRIS_16_GOT_GD: case R_CRIS_32_GOT_GD: if (elf_cris_hash_entry (h)->dtp_refcount == 0) { /* Allocate space in the .got section. */ sgot->size += got_element_size; /* Allocate relocation space. */ srelgot->size += sizeof (Elf32_External_Rela); } elf_cris_hash_entry (h)->dtp_refcount++; break; case R_CRIS_32_IE: case R_CRIS_32_GOT_TPREL: case R_CRIS_16_GOT_TPREL: if (elf_cris_hash_entry (h)->tprel_refcount == 0) { /* Allocate space in the .got section. */ sgot->size += got_element_size; /* Allocate relocation space. */ srelgot->size += sizeof (Elf32_External_Rela); } elf_cris_hash_entry (h)->tprel_refcount++; break; default: BFD_FAIL (); break; } } else { /* This is a global offset table entry for a local symbol. */ if (local_got_refcounts[r_symndx_lgot] == 0) { sgot->size += got_element_size; if (info->shared) { /* If we are generating a shared object, we need to output a R_CRIS_RELATIVE reloc so that the dynamic linker can adjust this GOT entry. Similarly for non-regular got entries. */ srelgot->size += sizeof (Elf32_External_Rela); } } /* Update the reloc-specific count. */ local_got_refcounts[r_symndx_lgot]++; /* This one is the sum of all the others. */ local_got_refcounts[r_symndx]++; } break; case R_CRIS_16_DTPREL: case R_CRIS_32_DTPREL: case R_CRIS_32_GOTREL: /* This reference requires a global offset table. FIXME: The actual refcount isn't used currently; the .got section can't be removed if there were any references in the input. */ local_got_refcounts[-1]++; break; handle_gotplt_reloc: case R_CRIS_32_PLT_GOTREL: /* This reference requires a global offset table. */ local_got_refcounts[-1]++; /* Fall through. */ case R_CRIS_32_PLT_PCREL: /* 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. */ /* Beware: if we'd check for visibility of the symbol here (and not marking the need for a PLT when non-visible), we'd get into trouble with keeping handling consistent with regards to relocs found before definition and GOTPLT handling. Eliminable PLT entries will be dealt with later anyway. */ if (h == NULL) continue; h->needs_plt = 1; h->plt.refcount++; break; case R_CRIS_8: case R_CRIS_16: case R_CRIS_32: /* Let's help debug shared library creation. Any of these relocs *can* be used in shared libs, but pages containing them cannot be shared, so they're not appropriate for common use. Don't warn for sections we don't care about, such as debug sections or non-constant sections. We can't help tables of (global) function pointers, for example, though they must be emitted in a (writable) data section to avoid having impure text sections. */ if (info->shared && (sec->flags & SEC_ALLOC) != 0 && (sec->flags & SEC_READONLY) != 0) { /* FIXME: How do we make this optionally a warning only? */ (*_bfd_error_handler) (_("%B, section %A:\n relocation %s should not" " be used in a shared object; recompile with -fPIC"), abfd, sec, cris_elf_howto_table[r_type].name); } if (h != NULL) { h->non_got_ref = 1; /* Make sure a plt entry is created for this symbol if it turns out to be a function defined by a dynamic object. */ if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) h->plt.refcount++; } /* If we are creating a shared library and this is not a local symbol, we need to copy the reloc into the shared library. However when linking with -Bsymbolic and this is a global symbol which is defined in an object we are including in the link (i.e., DEF_REGULAR is set), then we can resolve the reloc directly. At this point we have not seen all the input files, so it is possible that DEF_REGULAR is not set now but will be set later (it is never cleared). In case of a weak definition, DEF_REGULAR may be cleared later by a strong definition in a shared library. We account for that possibility below by storing information in the relocs_copied field of the hash table entry. A similar situation occurs when creating shared libraries and symbol visibility changes render the symbol local. */ /* No need to do anything if we're not creating a shared object. */ if (! info->shared) break; /* We don't need to handle relocs into sections not going into the "real" output. */ if ((sec->flags & SEC_ALLOC) == 0) break; /* We may need to create a reloc section in the dynobj and made room for this reloc. */ if (sreloc == NULL) { sreloc = _bfd_elf_make_dynamic_reloc_section (sec, dynobj, 2, abfd, /*rela?*/ TRUE); if (sreloc == NULL) return FALSE; } if (sec->flags & SEC_READONLY) info->flags |= DF_TEXTREL; sreloc->size += sizeof (Elf32_External_Rela); break; case R_CRIS_8_PCREL: case R_CRIS_16_PCREL: case R_CRIS_32_PCREL: if (h != NULL) { h->non_got_ref = 1; /* Make sure a plt entry is created for this symbol if it turns out to be a function defined by a dynamic object. */ if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) h->plt.refcount++; } /* If we are creating a shared library and this is not a local symbol, we need to copy the reloc into the shared library. However when linking with -Bsymbolic and this is a global symbol which is defined in an object we are including in the link (i.e., DEF_REGULAR is set), then we can resolve the reloc directly. At this point we have not seen all the input files, so it is possible that DEF_REGULAR is not set now but will be set later (it is never cleared). In case of a weak definition, DEF_REGULAR may be cleared later by a strong definition in a shared library. We account for that possibility below by storing information in the relocs_copied field of the hash table entry. A similar situation occurs when creating shared libraries and symbol visibility changes render the symbol local. */ /* No need to do anything if we're not creating a shared object. */ if (! info->shared) break; /* We don't need to handle relocs into sections not going into the "real" output. */ if ((sec->flags & SEC_ALLOC) == 0) break; /* If the symbol is local, then we know already we can eliminate the reloc. */ if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) break; /* If this is with -Bsymbolic and the symbol isn't weak, and is defined by an ordinary object (the ones we include in this shared library) then we can also eliminate the reloc. See comment above for more eliminable cases which we can't identify at this time. */ if (info->symbolic && h->root.type != bfd_link_hash_defweak && h->def_regular) break; /* We may need to create a reloc section in the dynobj and made room for this reloc. */ if (sreloc == NULL) { sreloc = _bfd_elf_make_dynamic_reloc_section (sec, dynobj, 2, abfd, /*rela?*/ TRUE); if (sreloc == NULL) return FALSE; } sreloc->size += sizeof (Elf32_External_Rela); /* We count the number of PC relative relocations we have entered for this symbol, so that we can discard them again if the symbol is later defined by a regular object. We know that h is really a pointer to an elf_cris_link_hash_entry. */ { struct elf_cris_link_hash_entry *eh; struct elf_cris_pcrel_relocs_copied *p; eh = elf_cris_hash_entry (h); for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) if (p->section == sreloc) break; if (p == NULL) { p = ((struct elf_cris_pcrel_relocs_copied *) bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); if (p == NULL) return FALSE; p->next = eh->pcrel_relocs_copied; eh->pcrel_relocs_copied = p; p->section = sreloc; p->count = 0; p->r_type = r_type; } ++p->count; } break; /* This relocation describes the C++ object vtable hierarchy. Reconstruct it for later use during GC. */ case R_CRIS_GNU_VTINHERIT: if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) return FALSE; break; /* This relocation describes which C++ vtable entries are actually used. Record for later use during GC. */ case R_CRIS_GNU_VTENTRY: BFD_ASSERT (h != NULL); if (h != NULL && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) return FALSE; break; case R_CRIS_16_TPREL: case R_CRIS_32_TPREL: /* Already warned above, when necessary. */ break; default: /* Other relocs do not appear here. */ bfd_set_error (bfd_error_bad_value); return FALSE; } } return TRUE; } /* Set the sizes of the dynamic sections. */ static bfd_boolean elf_cris_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) { struct elf_cris_link_hash_table * htab; bfd *dynobj; asection *s; bfd_boolean plt; bfd_boolean relocs; htab = elf_cris_hash_table (info); if (htab == NULL) return FALSE; dynobj = elf_hash_table (info)->dynobj; BFD_ASSERT (dynobj != NULL); if (elf_hash_table (info)->dynamic_sections_created) { /* Set the contents of the .interp section to the interpreter. */ if (info->executable) { s = bfd_get_section_by_name (dynobj, ".interp"); BFD_ASSERT (s != NULL); s->size = sizeof ELF_DYNAMIC_INTERPRETER; s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; } } else { /* Adjust all expected GOTPLT uses to use a GOT entry instead. */ elf_cris_link_hash_traverse (htab, elf_cris_adjust_gotplt_to_got, info); /* We may have created entries in the .rela.got section. However, if we are not creating the dynamic sections, we will not actually use these entries. Reset the size of .rela.got, which will cause it to get stripped from the output file below. */ s = bfd_get_section_by_name (dynobj, ".rela.got"); if (s != NULL) s->size = 0; } /* If this is a -Bsymbolic shared link, then we need to discard all PC relative relocs against symbols defined in a regular object. We allocated space for them in the check_relocs routine, but we will not fill them in in the relocate_section routine. We also discard space for relocs that have become for local symbols due to symbol visibility changes. For programs, we discard space for relocs for symbols not referenced by any dynamic object. */ if (info->shared) elf_cris_link_hash_traverse (htab, elf_cris_discard_excess_dso_dynamics, info); else elf_cris_link_hash_traverse (htab, elf_cris_discard_excess_program_dynamics, info); /* The check_relocs and adjust_dynamic_symbol entry points have determined the sizes of the various dynamic sections. Allocate memory for them. */ plt = FALSE; relocs = FALSE; for (s = dynobj->sections; s != NULL; s = s->next) { const char *name; if ((s->flags & SEC_LINKER_CREATED) == 0) continue; /* It's OK to base decisions on the section name, because none of the dynobj section names depend upon the input files. */ name = bfd_get_section_name (dynobj, s); if (strcmp (name, ".plt") == 0) { /* Remember whether there is a PLT. */ plt = s->size != 0; } else if (strcmp (name, ".got.plt") == 0) { /* The .got.plt contains the .got header as well as the actual .got.plt contents. The .got header may contain a R_CRIS_DTPMOD entry at index 3. */ s->size += htab->dtpmod_refcount != 0 ? 8 : 0; } else if (CONST_STRNEQ (name, ".rela")) { if (strcmp (name, ".rela.got") == 0 && htab->dtpmod_refcount != 0 && info->shared) s->size += sizeof (Elf32_External_Rela); if (s->size != 0) { /* Remember whether there are any reloc sections other than .rela.plt. */ if (strcmp (name, ".rela.plt") != 0) relocs = TRUE; /* We use the reloc_count field as a counter if we need to copy relocs into the output file. */ s->reloc_count = 0; } } else if (! CONST_STRNEQ (name, ".got") && strcmp (name, ".dynbss") != 0) { /* It's not one of our sections, so don't allocate space. */ continue; } if (s->size == 0) { /* If we don't need this section, strip it from the output file. This is mostly to handle .rela.bss and .rela.plt. We must create both sections in create_dynamic_sections, because they must be created before the linker maps input sections to output sections. The linker does that before adjust_dynamic_symbol is called, and it is that function which decides whether anything needs to go into these sections. */ s->flags |= SEC_EXCLUDE; continue; } if ((s->flags & SEC_HAS_CONTENTS) == 0) continue; /* Allocate memory for the section contents. We use bfd_zalloc here in case unused entries are not reclaimed before the section's contents are written out. This should not happen, but this way if it does, we will not write out garbage. For reloc sections, this will make entries have the type R_CRIS_NONE. */ s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); if (s->contents == NULL) return FALSE; } if (elf_hash_table (info)->dynamic_sections_created) { /* Add some entries to the .dynamic section. We fill in the values later, in elf_cris_finish_dynamic_sections, but we must add the entries now so that we get the correct size for the .dynamic section. The DT_DEBUG entry is filled in by the dynamic linker and used by the debugger. */ #define add_dynamic_entry(TAG, VAL) \ _bfd_elf_add_dynamic_entry (info, TAG, VAL) if (!info->shared) { if (!add_dynamic_entry (DT_DEBUG, 0)) return FALSE; } if (plt) { if (!add_dynamic_entry (DT_PLTGOT, 0) || !add_dynamic_entry (DT_PLTRELSZ, 0) || !add_dynamic_entry (DT_PLTREL, DT_RELA) || !add_dynamic_entry (DT_JMPREL, 0)) return FALSE; } if (relocs) { if (!add_dynamic_entry (DT_RELA, 0) || !add_dynamic_entry (DT_RELASZ, 0) || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) return FALSE; } if ((info->flags & DF_TEXTREL) != 0) { if (!add_dynamic_entry (DT_TEXTREL, 0)) return FALSE; info->flags |= DF_TEXTREL; } } #undef add_dynamic_entry return TRUE; } /* This function is called via elf_cris_link_hash_traverse if we are creating a shared object. In the -Bsymbolic case, it discards the space allocated to copy PC relative relocs against symbols which are defined in regular objects. For the normal non-symbolic case, we also discard space for relocs that have become local due to symbol visibility changes. We allocated space for them in the check_relocs routine, but we won't fill them in in the relocate_section routine. */ static bfd_boolean elf_cris_discard_excess_dso_dynamics (h, inf) struct elf_cris_link_hash_entry *h; PTR inf; { struct elf_cris_pcrel_relocs_copied *s; struct bfd_link_info *info = (struct bfd_link_info *) inf; if (h->root.root.type == bfd_link_hash_warning) h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link; /* If a symbol has been forced local or we have found a regular definition for the symbolic link case, then we won't be needing any relocs. */ if (h->root.def_regular && (h->root.forced_local || info->symbolic)) { for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) s->section->size -= s->count * sizeof (Elf32_External_Rela); return TRUE; } /* If we have accounted for PC-relative relocs for read-only sections, now is the time to warn for them. We can't do it in cris_elf_check_relocs, because we don't know the status of all symbols at that time (and it's common to force symbols local late). */ for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) { BFD_ASSERT ((s->section->flags & SEC_READONLY) != 0); /* FIXME: How do we make this optionally a warning only? */ (*_bfd_error_handler) (_("%B, section `%A', to symbol `%s':\n" " relocation %s should not be used" " in a shared object; recompile with -fPIC"), s->section->owner, s->section, h->root.root.root.string, cris_elf_howto_table[s->r_type].name); info->flags |= DF_TEXTREL; } return TRUE; } /* This function is called via elf_cris_link_hash_traverse if we are *not* creating a shared object. We discard space for relocs for symbols put in the .got, but which we found we do not have to resolve at run-time. */ static bfd_boolean elf_cris_discard_excess_program_dynamics (h, inf) struct elf_cris_link_hash_entry *h; PTR inf; { struct bfd_link_info *info = (struct bfd_link_info *) inf; if (h->root.root.type == bfd_link_hash_warning) h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link; /* If we're not creating a shared library and have a symbol which is referred to by .got references, but the symbol is defined locally, (or rather, not defined by a DSO) then lose the reloc for the .got (don't allocate room for it). Likewise for relocs for something for which we create a PLT. */ if (!h->root.def_dynamic || h->root.plt.refcount > 0) { if (h->reg_got_refcount > 0 /* The size of this section is only valid and in sync with the various reference counts if we do dynamic; don't decrement it otherwise. */ && elf_hash_table (info)->dynamic_sections_created) { bfd *dynobj = elf_hash_table (info)->dynobj; asection *srelgot; BFD_ASSERT (dynobj != NULL); srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); BFD_ASSERT (srelgot != NULL); srelgot->size -= sizeof (Elf32_External_Rela); } /* If the locally-defined symbol isn't used by a DSO, then we don't have to export it as a dynamic symbol. This was already done for functions; doing this for all symbols would presumably not introduce new problems. Of course we don't do this if we're exporting all dynamic symbols. */ if (! info->export_dynamic && h->root.dynindx != -1 && !h->root.def_dynamic && !h->root.ref_dynamic) { h->root.dynindx = -1; _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, h->root.dynstr_index); } } return TRUE; } /* Reject a file depending on presence and expectation of prefixed underscores on symbols. */ static bfd_boolean cris_elf_object_p (abfd) bfd *abfd; { if (! cris_elf_set_mach_from_flags (abfd, elf_elfheader (abfd)->e_flags)) return FALSE; if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)) return (bfd_get_symbol_leading_char (abfd) == '_'); else return (bfd_get_symbol_leading_char (abfd) == 0); } /* Mark presence or absence of leading underscore. Set machine type flags from mach type. */ static void cris_elf_final_write_processing (abfd, linker) bfd *abfd; bfd_boolean linker ATTRIBUTE_UNUSED; { unsigned long e_flags = elf_elfheader (abfd)->e_flags; e_flags &= ~EF_CRIS_UNDERSCORE; if (bfd_get_symbol_leading_char (abfd) == '_') e_flags |= EF_CRIS_UNDERSCORE; switch (bfd_get_mach (abfd)) { case bfd_mach_cris_v0_v10: e_flags |= EF_CRIS_VARIANT_ANY_V0_V10; break; case bfd_mach_cris_v10_v32: e_flags |= EF_CRIS_VARIANT_COMMON_V10_V32; break; case bfd_mach_cris_v32: e_flags |= EF_CRIS_VARIANT_V32; break; default: _bfd_abort (__FILE__, __LINE__, _("Unexpected machine number")); } elf_elfheader (abfd)->e_flags = e_flags; } /* Set the mach type from e_flags value. */ static bfd_boolean cris_elf_set_mach_from_flags (abfd, flags) bfd *abfd; unsigned long flags; { switch (flags & EF_CRIS_VARIANT_MASK) { case EF_CRIS_VARIANT_ANY_V0_V10: bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v0_v10); break; case EF_CRIS_VARIANT_V32: bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v32); break; case EF_CRIS_VARIANT_COMMON_V10_V32: bfd_default_set_arch_mach (abfd, bfd_arch_cris, bfd_mach_cris_v10_v32); break; default: /* Since we don't recognize them, we obviously can't support them with this code; we'd have to require that all future handling would be optional. */ bfd_set_error (bfd_error_wrong_format); return FALSE; } return TRUE; } /* Display the flags field. */ static bfd_boolean cris_elf_print_private_bfd_data (abfd, ptr) bfd *abfd; PTR ptr; { FILE *file = (FILE *) ptr; BFD_ASSERT (abfd != NULL && ptr != NULL); _bfd_elf_print_private_bfd_data (abfd, ptr); fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE) fprintf (file, _(" [symbols have a _ prefix]")); if ((elf_elfheader (abfd)->e_flags & EF_CRIS_VARIANT_MASK) == EF_CRIS_VARIANT_COMMON_V10_V32) fprintf (file, _(" [v10 and v32]")); if ((elf_elfheader (abfd)->e_flags & EF_CRIS_VARIANT_MASK) == EF_CRIS_VARIANT_V32) fprintf (file, _(" [v32]")); fputc ('\n', file); return TRUE; } /* Don't mix files with and without a leading underscore. */ static bfd_boolean cris_elf_merge_private_bfd_data (ibfd, obfd) bfd *ibfd; bfd *obfd; { int imach, omach; if (! _bfd_generic_verify_endian_match (ibfd, obfd)) return FALSE; if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour || bfd_get_flavour (obfd) != bfd_target_elf_flavour) return TRUE; imach = bfd_get_mach (ibfd); if (! elf_flags_init (obfd)) { /* This happens when ld starts out with a 'blank' output file. */ elf_flags_init (obfd) = TRUE; /* We ignore the linker-set mach, and instead set it according to the first input file. This would also happen if we could somehow filter out the OUTPUT_ARCH () setting from elf.sc. This allows us to keep the same linker config across cris(v0..v10) and crisv32. The drawback is that we can't force the output type, which might be a sane thing to do for a v10+v32 compatibility object. */ if (! bfd_set_arch_mach (obfd, bfd_arch_cris, imach)) return FALSE; } if (bfd_get_symbol_leading_char (ibfd) != bfd_get_symbol_leading_char (obfd)) { (*_bfd_error_handler) (bfd_get_symbol_leading_char (ibfd) == '_' ? _("%B: uses _-prefixed symbols, but writing file with non-prefixed symbols") : _("%B: uses non-prefixed symbols, but writing file with _-prefixed symbols"), ibfd); bfd_set_error (bfd_error_bad_value); return FALSE; } omach = bfd_get_mach (obfd); if (imach != omach) { /* We can get an incompatible combination only if either is bfd_mach_cris_v32, and the other one isn't compatible. */ if ((imach == bfd_mach_cris_v32 && omach != bfd_mach_cris_v10_v32) || (omach == bfd_mach_cris_v32 && imach != bfd_mach_cris_v10_v32)) { (*_bfd_error_handler) ((imach == bfd_mach_cris_v32) ? _("%B contains CRIS v32 code, incompatible" " with previous objects") : _("%B contains non-CRIS-v32 code, incompatible" " with previous objects"), ibfd); bfd_set_error (bfd_error_bad_value); return FALSE; } /* We don't have to check the case where the input is compatible with v10 and v32, because the output is already known to be set to the other (compatible) mach. */ if (omach == bfd_mach_cris_v10_v32 && ! bfd_set_arch_mach (obfd, bfd_arch_cris, imach)) return FALSE; } return TRUE; } /* Do side-effects of e_flags copying to obfd. */ static bfd_boolean cris_elf_copy_private_bfd_data (ibfd, obfd) bfd *ibfd; bfd *obfd; { /* Call the base function. */ if (!_bfd_elf_copy_private_bfd_data (ibfd, obfd)) return FALSE; /* If output is big-endian for some obscure reason, stop here. */ if (_bfd_generic_verify_endian_match (ibfd, obfd) == FALSE) return FALSE; if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour || bfd_get_flavour (obfd) != bfd_target_elf_flavour) return TRUE; /* Do what we really came here for. */ return bfd_set_arch_mach (obfd, bfd_arch_cris, bfd_get_mach (ibfd)); } static enum elf_reloc_type_class elf_cris_reloc_type_class (rela) const Elf_Internal_Rela *rela; { enum elf_cris_reloc_type r_type = ELF32_R_TYPE (rela->r_info); switch (r_type) { case R_CRIS_RELATIVE: return reloc_class_relative; case R_CRIS_JUMP_SLOT: return reloc_class_plt; case R_CRIS_COPY: return reloc_class_copy; default: return reloc_class_normal; } } /* The elf_backend_got_elt_size worker. For one symbol, we can have up to two GOT entries from three types with two different sizes. We handle it as a single entry, so we can use the regular offset-calculation machinery. */ static bfd_vma elf_cris_got_elt_size (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *info ATTRIBUTE_UNUSED, struct elf_link_hash_entry *hr, bfd *ibfd, unsigned long symndx) { struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) hr; bfd_vma eltsiz = 0; /* We may have one regular GOT entry or up to two TLS GOT entries. */ if (h == NULL) { Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; bfd_signed_vma *local_got_refcounts = elf_local_got_refcounts (ibfd); BFD_ASSERT (local_got_refcounts != NULL); if (local_got_refcounts[LGOT_REG_NDX (symndx)] > 0) { /* We can't have a variable referred to both as a regular variable and through TLS relocs. */ BFD_ASSERT (local_got_refcounts[LGOT_DTP_NDX (symndx)] == 0 && local_got_refcounts[LGOT_TPREL_NDX (symndx)] == 0); return 4; } if (local_got_refcounts[LGOT_DTP_NDX (symndx)] > 0) eltsiz += 8; if (local_got_refcounts[LGOT_TPREL_NDX (symndx)] > 0) eltsiz += 4; } else { struct elf_cris_link_hash_entry *hh = elf_cris_hash_entry (h); if (hh->reg_got_refcount > 0) { /* The actual error-on-input is emitted elsewhere. */ BFD_ASSERT (hh->dtp_refcount == 0 && hh->tprel_refcount == 0); return 4; } if (hh->dtp_refcount > 0) eltsiz += 8; if (hh->tprel_refcount > 0) eltsiz += 4; } /* We're only called when h->got.refcount is non-zero, so we must have a non-zero size. */ BFD_ASSERT (eltsiz != 0); return eltsiz; } #define ELF_ARCH bfd_arch_cris #define ELF_MACHINE_CODE EM_CRIS #define ELF_MAXPAGESIZE 0x2000 #define TARGET_LITTLE_SYM bfd_elf32_cris_vec #define TARGET_LITTLE_NAME "elf32-cris" #define elf_symbol_leading_char 0 #define elf_info_to_howto_rel NULL #define elf_info_to_howto cris_info_to_howto_rela #define elf_backend_relocate_section cris_elf_relocate_section #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook #define elf_backend_plt_sym_val cris_elf_plt_sym_val #define elf_backend_check_relocs cris_elf_check_relocs #define elf_backend_grok_prstatus cris_elf_grok_prstatus #define elf_backend_grok_psinfo cris_elf_grok_psinfo #define elf_backend_can_gc_sections 1 #define elf_backend_can_refcount 1 #define elf_backend_object_p cris_elf_object_p #define elf_backend_final_write_processing \ cris_elf_final_write_processing #define bfd_elf32_bfd_print_private_bfd_data \ cris_elf_print_private_bfd_data #define bfd_elf32_bfd_merge_private_bfd_data \ cris_elf_merge_private_bfd_data #define bfd_elf32_bfd_copy_private_bfd_data \ cris_elf_copy_private_bfd_data #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup #define bfd_elf32_bfd_reloc_name_lookup cris_reloc_name_lookup #define bfd_elf32_bfd_link_hash_table_create \ elf_cris_link_hash_table_create #define elf_backend_adjust_dynamic_symbol \ elf_cris_adjust_dynamic_symbol #define elf_backend_copy_indirect_symbol \ elf_cris_copy_indirect_symbol #define elf_backend_size_dynamic_sections \ elf_cris_size_dynamic_sections #define elf_backend_init_index_section _bfd_elf_init_1_index_section #define elf_backend_finish_dynamic_symbol \ elf_cris_finish_dynamic_symbol #define elf_backend_finish_dynamic_sections \ elf_cris_finish_dynamic_sections #define elf_backend_create_dynamic_sections \ _bfd_elf_create_dynamic_sections #define bfd_elf32_bfd_final_link \ bfd_elf_gc_common_final_link #define elf_backend_hide_symbol elf_cris_hide_symbol #define elf_backend_reloc_type_class elf_cris_reloc_type_class #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_got_elt_size elf_cris_got_elt_size /* Later, we my want to optimize RELA entries into REL entries for dynamic linking and libraries (if it's a win of any significance). Until then, take the easy route. */ #define elf_backend_may_use_rel_p 0 #define elf_backend_may_use_rela_p 1 #define elf_backend_rela_normal 1 #include "elf32-target.h" #undef TARGET_LITTLE_SYM #undef TARGET_LITTLE_NAME #undef elf_symbol_leading_char #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec #define TARGET_LITTLE_NAME "elf32-us-cris" #define elf_symbol_leading_char '_' #undef elf32_bed #define elf32_bed elf32_us_cris_bed #include "elf32-target.h"
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