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[/] [or1k/] [trunk/] [insight/] [bfd/] [elf32-cris.c] - Rev 1771
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/* CRIS-specific support for 32-bit ELF. Copyright 2000, 2001 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 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "bfd.h" #include "sysdep.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf/cris.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 *, Elf32_Internal_Rela *)); static 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 boolean cris_elf_gc_sweep_hook PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); static asection * cris_elf_gc_mark_hook PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, struct elf_link_hash_entry *, Elf_Internal_Sym *)); static boolean cris_elf_object_p PARAMS ((bfd *)); static void cris_elf_final_write_processing PARAMS ((bfd *, boolean)); static boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR)); static boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *)); struct elf_cris_link_hash_entry; static boolean elf_cris_discard_excess_dso_dynamics PARAMS ((struct elf_cris_link_hash_entry *, PTR)); static boolean elf_cris_discard_excess_program_dynamics PARAMS ((struct elf_cris_link_hash_entry *, PTR)); static boolean elf_cris_adjust_gotplt_to_got PARAMS ((struct elf_cris_link_hash_entry *, PTR)); static 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 boolean elf_cris_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); static boolean elf_cris_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); static boolean elf_cris_finish_dynamic_symbol PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, Elf_Internal_Sym *)); static 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 *)); 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 */ complain_overflow_bitfield, /* 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 */ bfd_elf_generic_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 */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_16", /* 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 */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_32", /* 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 */ bfd_elf_generic_reloc, /* special_function */ "R_CRIS_32_PLT_PCREL", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ true) /* pcrel_offset */ }; /* 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 } }; 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 = 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; } /* 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; Elf32_Internal_Rela * dst; { unsigned int 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]; } /* 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 /* 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 [...] */ }; /* 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. */ }; /* 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. */ }; /* 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 }; /* 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; }; /* 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; }; /* 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; }; /* Traverse a CRIS ELF linker hash table. */ #define elf_cris_link_hash_traverse(table, func, info) \ (elf_link_hash_traverse \ (&(table)->root, \ (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ (info))) /* Get the CRIS ELF linker hash table from a link_info structure. */ #define elf_cris_hash_table(p) \ ((struct elf_cris_link_hash_table *) (p)->hash) /* Create an entry in a CRIS ELF linker hash table. */ static struct bfd_hash_entry * elf_cris_link_hash_newfunc (entry, table, string) 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; } 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 (abfd) bfd *abfd; { struct elf_cris_link_hash_table *ret; ret = ((struct elf_cris_link_hash_table *) bfd_alloc (abfd, sizeof (struct elf_cris_link_hash_table))); 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)) { bfd_release (abfd, 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; 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; /* 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 (ELF32_R_TYPE (rel->r_info)) { /* 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; } /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was copied, for further comments. */ static boolean cris_elf_relocate_section (output_bfd, info, input_bfd, input_section, contents, relocs, local_syms, local_sections) 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; { 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; 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; /* It seems this can happen with erroneous or unsupported input (mixing a.out and elf in an archive, for example.) */ if (sym_hashes == NULL) return false; sgot = NULL; splt = NULL; sreloc = 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 * name = NULL; int 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); if (info->relocateable) { /* This is a relocateable link. We don't have to change anything, unless the reloc is against a section symbol, in which case we have to adjust according to where the section symbol winds up in the output section. */ if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) { sec = local_sections [r_symndx]; rel->r_addend += sec->output_offset + sym->st_value; } } continue; } /* This is a final link. */ 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 = (sec->output_section->vma + sec->output_offset + sym->st_value); name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, sym->st_name); name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; } 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; name = h->root.root.string; if (h->root.type == bfd_link_hash_defined || h->root.type == bfd_link_hash_defweak) { sec = h->root.u.def.section; /* 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. */ if ((sec->output_section == NULL && (sec->owner->flags & DYNAMIC) != 0) /* 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. */ || (info->shared && ((! info->symbolic && h->dynindx != -1) || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) && (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 (sec->output_section != NULL) relocation = (h->root.u.def.value + sec->output_section->vma + sec->output_offset); else { if (input_bfd->my_archive) (*_bfd_error_handler) (_("%s(%s): unresolvable relocation %s against symbol `%s' from %s section"), bfd_get_filename (bfd_my_archive (input_bfd)), bfd_get_filename (input_bfd), cris_elf_howto_table[r_type].name, name, bfd_get_section_name (input_bfd, input_section)); else (*_bfd_error_handler) (_("%s: unresolvable relocation %s against symbol `%s' from %s section"), bfd_get_filename (input_bfd), cris_elf_howto_table[r_type].name, name, bfd_get_section_name (input_bfd, input_section)); bfd_set_error (bfd_error_bad_value); return false; } } else if (h->root.type == bfd_link_hash_undefweak) relocation = 0; else if (info->shared && !info->symbolic && !info->no_undefined && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) relocation = 0; else { if (!(info->callbacks->undefined_symbol (info, name, input_bfd, input_section, rel->r_offset, (!info->shared || info->no_undefined || ELF_ST_VISIBILITY (h->other))))) return false; relocation = 0; } } 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. */ if (h != NULL && h->got.offset == (bfd_vma) -1) { (*_bfd_error_handler) (_("%s: No PLT nor GOT for relocation %s against symbol `%s' from %s section"), bfd_get_filename (input_bfd), cris_elf_howto_table[r_type].name, name[0] != '\0' ? name : _("[whose name is lost]"), bfd_get_section_name (input_bfd, input_section)); /* 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->dynindx == -1) || (info->shared && (info->symbolic || h->dynindx == -1) && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) { /* This wasn't checked above for ! info->shared, but must hold there if we get here; the symbol must not be used in, or defined by a DSO. (Note that checking for ELF_LINK_HASH_DEF_REGULAR doesn't catch all cases.) */ BFD_ASSERT (info->shared || (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC | ELF_LINK_HASH_DEF_DYNAMIC)) == 0); /* This is actually a static link, or it is a -Bsymbolic link and the symbol is defined locally, or the symbol was forced to be local because of a version file, or we're not creating a dynamic object and the symbol isn't referred to by 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. When doing a dynamic link, we create a .rela.got relocation entry to initialize the value. This is done in the finish_dynamic_symbol routine. */ if ((off & 1) != 0) off &= ~1; else { bfd_put_32 (output_bfd, relocation, 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) { asection *srelgot; Elf_Internal_Rela outrel; 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; bfd_elf32_swap_reloca_out (output_bfd, &outrel, (((Elf32_External_Rela *) srelgot->contents) + srelgot->reloc_count)); ++srelgot->reloc_count; } 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) (_("%s: relocation %s with non-zero addend %d against local symbol from %s section"), bfd_get_filename (input_bfd), cris_elf_howto_table[r_type].name, rel->r_addend, bfd_get_section_name (input_bfd, input_section)); else (*_bfd_error_handler) (_("%s: relocation %s with non-zero addend %d against symbol `%s' from %s section"), bfd_get_filename (input_bfd), cris_elf_howto_table[r_type].name, rel->r_addend, name[0] != '\0' ? name : _("[whose name is lost]"), bfd_get_section_name (input_bfd, input_section)); bfd_set_error (bfd_error_bad_value); return false; } } break; case R_CRIS_32_GOTREL: /* This relocation must only be performed against local symbols. */ if (h != NULL) { (*_bfd_error_handler) (_("%s: relocation %s is not allowed for global symbol: `%s' from %s section"), bfd_get_filename (input_bfd), cris_elf_howto_table[r_type].name, name, bfd_get_section_name (input_bfd, input_section)); 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) 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) 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) break; /* Fall through. */ case R_CRIS_8: case R_CRIS_16: case R_CRIS_32: if (info->shared && (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->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))) { Elf_Internal_Rela outrel; 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) { const char *name; name = (bfd_elf_string_from_elf_section (input_bfd, elf_elfheader (input_bfd)->e_shstrndx, elf_section_data (input_section)->rel_hdr.sh_name)); if (name == NULL) return false; BFD_ASSERT (strncmp (name, ".rela", 5) == 0 && strcmp (bfd_get_section_name (input_bfd, input_section), name + 5) == 0); sreloc = bfd_get_section_by_name (dynobj, name); /* That 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_error_handler) (_("%s: Internal inconsistency; no relocation section %s"), bfd_get_filename (input_bfd), name); bfd_set_error (bfd_error_bad_value); return false; } } skip = false; if (elf_section_data (input_section)->stab_info == NULL) outrel.r_offset = rel->r_offset; else { bfd_vma off; off = (_bfd_stab_section_offset (output_bfd, &elf_hash_table (info)->stab_info, input_section, &elf_section_data (input_section)->stab_info, rel->r_offset)); if (off == (bfd_vma) -1) skip = true; outrel.r_offset = off; } outrel.r_offset += (input_section->output_section->vma + input_section->output_offset); if (skip) { memset (&outrel, 0, sizeof outrel); relocate = false; } /* h->dynindx may be -1 if the symbol was marked to become local. */ else if (h != NULL && ((! info->symbolic && h->dynindx != -1) || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)) { BFD_ASSERT (h->dynindx != -1); relocate = false; outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); outrel.r_addend = relocation + rel->r_addend; } else { if (r_type == R_CRIS_32) { relocate = true; outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); outrel.r_addend = relocation + rel->r_addend; } else { long indx; if (h == NULL) sec = local_sections[r_symndx]; else { BFD_ASSERT (h->root.type == bfd_link_hash_defined || (h->root.type == bfd_link_hash_defweak)); sec = h->root.u.def.section; } if (sec != NULL && 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; osec = sec->output_section; indx = elf_section_data (osec)->dynindx; BFD_ASSERT (indx > 0); } relocate = false; outrel.r_info = ELF32_R_INFO (indx, r_type); outrel.r_addend = relocation + rel->r_addend; } } bfd_elf32_swap_reloca_out (output_bfd, &outrel, (((Elf32_External_Rela *) sreloc->contents) + sreloc->reloc_count)); ++sreloc->reloc_count; /* 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; } 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, name, howto->name, (bfd_vma) 0, input_bfd, input_section, rel->r_offset); break; case bfd_reloc_undefined: r = info->callbacks->undefined_symbol (info, name, 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, name, 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 boolean elf_cris_finish_dynamic_symbol (output_bfd, info, h, sym) bfd *output_bfd; struct bfd_link_info *info; struct elf_link_hash_entry *h; Elf_Internal_Sym *sym; { bfd *dynobj; int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16; 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 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset; Elf_Internal_Rela rela; boolean has_gotplt = gotplt_offset != 0; /* Get the index in the procedure linkage table which corresponds to this symbol. This is the index of this symbol in all the symbols for which we are making plt entries. The first entry in the procedure linkage table is reserved. */ /* We have to count backwards here, and the result is only valid as an index into .got.plt and its relocations. FIXME: Constants... */ bfd_vma gotplt_index = 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, here and in elflink.h at least. */ bfd_vma got_offset = (has_gotplt ? gotplt_offset : h->got.offset + elf_cris_hash_table(info)->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, elf_cris_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, elf_cris_pic_plt_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 into the reloc table. */ bfd_put_32 (output_bfd, gotplt_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 + 4), 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 + 8), 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; bfd_elf32_swap_reloca_out (output_bfd, &rela, ((Elf32_External_Rela *) srela->contents + gotplt_index)); } if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) { /* 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->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) == 0) sym->st_value = 0; } } /* We don't emit .got relocs for symbols that aren't in the dynamic-symbols table for an ordinary program. */ if (h->got.offset != (bfd_vma) -1 && (info->shared || h->dynindx != -1)) { asection *sgot; asection *srela; Elf_Internal_Rela rela; /* 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 &~ 1)); /* If this is a static link, or it is a -Bsymbolic link and the symbol is defined locally or was forced to be local because of a version file, we just want to emit a RELATIVE reloc. The entry in the global offset table will already have been initialized in the relocate_section function. */ if (! elf_hash_table (info)->dynamic_sections_created || (info->shared && (info->symbolic || h->dynindx == -1) && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) { rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE); rela.r_addend = bfd_get_signed_32 (output_bfd, (sgot->contents + (h->got.offset & ~1))); } else { bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + (h->got.offset & ~1)); rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT); rela.r_addend = 0; } bfd_elf32_swap_reloca_out (output_bfd, &rela, ((Elf32_External_Rela *) srela->contents + srela->reloc_count)); ++srela->reloc_count; } if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) { asection *s; Elf_Internal_Rela rela; /* 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; bfd_elf32_swap_reloca_out (output_bfd, &rela, ((Elf32_External_Rela *) s->contents + s->reloc_count)); ++s->reloc_count; } /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ if (strcmp (h->root.root.string, "_DYNAMIC") == 0 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) sym->st_shndx = SHN_ABS; return true; } /* Finish up the dynamic sections. */ static 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->_raw_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 if (s->_cooked_size != 0) dyn.d_un.d_val = s->_cooked_size; else dyn.d_un.d_val = s->_raw_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) { if (s->_cooked_size != 0) dyn.d_un.d_val -= s->_cooked_size; else dyn.d_un.d_val -= s->_raw_size; } bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); break; } } /* Fill in the first entry in the procedure linkage table. */ if (splt->_raw_size > 0) { 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->_raw_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 (abfd, info, rel, h, sym) bfd * abfd; struct bfd_link_info * info ATTRIBUTE_UNUSED; Elf_Internal_Rela * rel; struct elf_link_hash_entry * h; Elf_Internal_Sym * sym; { if (h != NULL) { switch (ELF32_R_TYPE (rel->r_info)) { case R_CRIS_GNU_VTINHERIT: case R_CRIS_GNU_VTENTRY: break; default: switch (h->root.type) { case bfd_link_hash_defined: case bfd_link_hash_defweak: return h->root.u.def.section; case bfd_link_hash_common: return h->root.u.c.p->section; default: break; } } } else { if (!(elf_bad_symtab (abfd) && ELF_ST_BIND (sym->st_info) != STB_LOCAL) && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) && sym->st_shndx != SHN_COMMON)) { return bfd_section_from_elf_index (abfd, sym->st_shndx); } } return NULL; } /* Update the got entry reference counts for the section being removed. */ static boolean cris_elf_gc_sweep_hook (abfd, info, sec, relocs) bfd * abfd ATTRIBUTE_UNUSED; struct bfd_link_info * info ATTRIBUTE_UNUSED; asection * sec ATTRIBUTE_UNUSED; const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED; { Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; bfd_signed_vma *local_got_refcounts; const Elf_Internal_Rela *rel, *relend; unsigned long r_symndx; struct elf_link_hash_entry *h; bfd *dynobj; asection *sgot; asection *srelgot; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; sym_hashes = elf_sym_hashes (abfd); local_got_refcounts = elf_local_got_refcounts (abfd); dynobj = elf_hash_table (info)->dynobj; if (dynobj == NULL) return true; 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++) { switch (ELF32_R_TYPE (rel->r_info)) { case R_CRIS_16_GOT: case R_CRIS_32_GOT: r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx >= symtab_hdr->sh_info) { h = sym_hashes[r_symndx - symtab_hdr->sh_info]; if (h->got.refcount > 0) { --h->got.refcount; if (h->got.refcount == 0) { /* We don't need the .got entry any more. */ sgot->_raw_size -= 4; srelgot->_raw_size -= sizeof (Elf32_External_Rela); } } break; } local_got_reloc: if (local_got_refcounts != NULL) { if (local_got_refcounts[r_symndx] > 0) { --local_got_refcounts[r_symndx]; if (local_got_refcounts[r_symndx] == 0) { /* We don't need the .got entry any more. */ sgot->_raw_size -= 4; if (info->shared) srelgot->_raw_size -= sizeof (Elf32_External_Rela); } } } break; case R_CRIS_16_GOTPLT: case R_CRIS_32_GOTPLT: /* For local symbols, treat these like GOT relocs. */ r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx < symtab_hdr->sh_info) goto local_got_reloc; 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: r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx >= symtab_hdr->sh_info) { h = sym_hashes[r_symndx - symtab_hdr->sh_info]; if (h->plt.refcount > 0) --h->plt.refcount; } break; default: break; } } return true; } /* 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 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; bfd *dynobj = elf_hash_table (info)->dynobj; BFD_ASSERT (dynobj != NULL); /* If nobody wanted a GOTPLT with this symbol, we're done. */ if (h->gotplt_refcount <= 0) return true; if (h->root.got.refcount > 0) { /* There's a GOT entry for this symbol. Just adjust the refcount. Probably not necessary at this stage, but keeping it accurate helps avoiding surprises later. */ h->root.got.refcount += h->gotplt_refcount; h->gotplt_refcount = -1; } else { /* No GOT entry for this symbol. We need to create one. */ asection *sgot = bfd_get_section_by_name (dynobj, ".got"); asection *srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); /* Put an accurate refcount there. */ h->root.got.refcount = h->gotplt_refcount; h->gotplt_refcount = -1; /* We always have a .got section when there are dynamic relocs. */ BFD_ASSERT (sgot != NULL /* Surely have .got section. */); /* We might have had a PLT but with no GOT entry and further no GOT reloc section at all needed before. Add it. */ if (srelgot == NULL) { srelgot = bfd_make_section (dynobj, ".rela.got"); if (srelgot == NULL || !bfd_set_section_flags (dynobj, srelgot, (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED | SEC_READONLY)) || !bfd_set_section_alignment (dynobj, srelgot, 2)) return false; } /* Allocate space in the .got section. */ sgot->_raw_size += 4; /* Allocate relocation space. */ srelgot->_raw_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. We don't have to generate a PLT at all. - When there are both (ordinary) PLT references and GOT references. We want to make the PLT reference use the ordinary GOT entry rather than 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. 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 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) struct bfd_link_info *info; struct elf_link_hash_entry *h; { elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info); _bfd_elf_link_hash_hide_symbol (info, h); } /* 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 boolean elf_cris_adjust_dynamic_symbol (info, h) struct bfd_link_info *info; struct elf_link_hash_entry *h; { bfd *dynobj; asection *s; unsigned int power_of_two; dynobj = elf_hash_table (info)->dynobj; /* Make sure we know what is going on here. */ BFD_ASSERT (dynobj != NULL && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) || h->weakdef != NULL || ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))); /* 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->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) { if (! info->shared && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 /* We must always create the plt entry if it was referenced by a PLT relocation. In this case we already recorded it as a dynamic symbol. */ /* FIXME: m68k and i386 differ here, for unclear reasons. */ && h->dynindx == -1) { /* This case can occur if we saw a PLT reloc in an input file, but the symbol was never referred to by a dynamic object. In such a case, we don't actually need to build a procedure linkage table, and we can just do a PC reloc instead, or change a .got.plt index to a .got index for GOTPLT relocs. */ BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_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 there are only GOT references and GOTPLT references to this PLT entry, get rid of the PLT. */ if (! 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->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; h->plt.offset = (bfd_vma) -1; return true; } /* Make sure this symbol is output as a dynamic symbol. */ if (h->dynindx == -1) { if (! bfd_elf32_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->_raw_size == 0) s->_raw_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. This is required to make function pointers compare as equal between the normal executable and the shared library. */ if (!info->shared && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) { h->root.u.def.section = s; h->root.u.def.value = s->_raw_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. */ if (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 pointer-size. */ BFD_ASSERT ((s->_raw_size & 3) == 0); /* Change the PLT refcount to an offset. */ h->plt.offset = s->_raw_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->_raw_size += PLT_ENTRY_SIZE; return true; } /* No GOT reference for this symbol; prepare for an ordinary PLT. */ h->plt.offset = s->_raw_size; /* Make room for this entry. */ s->_raw_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 = elf_cris_hash_table (info)->next_gotplt_entry; elf_cris_hash_table (info)->next_gotplt_entry += 4; s = bfd_get_section_by_name (dynobj, ".got.plt"); BFD_ASSERT (s != NULL); s->_raw_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->_raw_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->weakdef != NULL) { BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined || h->weakdef->root.type == bfd_link_hash_defweak); h->root.u.def.section = h->weakdef->root.u.def.section; h->root.u.def.value = h->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->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) 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->_raw_size += sizeof (Elf32_External_Rela); h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; } /* Historic precedent: m68k and i386 allow max 8-byte alignment for the thing to copy; so do we. */ /* We need to figure out the alignment required for this symbol. I have no idea how ELF linkers handle this. */ power_of_two = bfd_log2 (h->size); if (power_of_two > 3) power_of_two = 3; /* Apply the required alignment. */ s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two)); if (power_of_two > bfd_get_section_alignment (dynobj, s)) { if (!bfd_set_section_alignment (dynobj, s, power_of_two)) return false; } /* Define the symbol as being at this point in the section. */ h->root.u.def.section = s; h->root.u.def.value = s->_raw_size; /* Increment the section size to make room for the symbol. */ s->_raw_size += h->size; return true; } /* Look through the relocs for a section during the first phase. */ static boolean cris_elf_check_relocs (abfd, info, sec, relocs) bfd *abfd; struct bfd_link_info *info; asection *sec; const Elf_Internal_Rela *relocs; { bfd *dynobj; Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 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->relocateable) return true; dynobj = elf_hash_table (info)->dynobj; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; sym_hashes = elf_sym_hashes (abfd); sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); local_got_refcounts = elf_local_got_refcounts (abfd); sgot = NULL; srelgot = NULL; sreloc = NULL; if (!elf_bad_symtab (abfd)) sym_hashes_end -= symtab_hdr->sh_info; 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; r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx < symtab_hdr->sh_info) h = NULL; else h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 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_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; /* 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; } break; default: break; } /* Some relocs require a global offset table (but perhaps not a specific GOT entry). */ switch (r_type) { case R_CRIS_16_GOT: case R_CRIS_32_GOT: case R_CRIS_32_GOTREL: case R_CRIS_32_PLT_GOTREL: if (sgot == NULL) sgot = bfd_get_section_by_name (dynobj, ".got"); if (local_got_refcounts == NULL) { size_t size; /* We use index local_got_refcounts[-1] to count all GOT-relative relocations that do not have explicit GOT entries. */ size = (symtab_hdr->sh_info + 1) * sizeof (bfd_signed_vma); local_got_refcounts = ((bfd_signed_vma *) bfd_alloc (abfd, size)); if (local_got_refcounts == NULL) return false; memset (local_got_refcounts, -1, size); local_got_refcounts++; elf_local_got_refcounts (abfd) = local_got_refcounts; } break; 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) { ((struct elf_cris_link_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_16_GOT: case R_CRIS_32_GOT: /* This symbol requires a global offset table entry. */ if (srelgot == NULL && (h != NULL || info->shared)) { srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); if (srelgot == NULL) { srelgot = bfd_make_section (dynobj, ".rela.got"); if (srelgot == NULL || !bfd_set_section_flags (dynobj, srelgot, (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED | SEC_READONLY)) || !bfd_set_section_alignment (dynobj, srelgot, 2)) return false; } } if (h != NULL) { if (h->got.refcount == -1) { h->got.refcount = 1; /* Make sure this symbol is output as a dynamic symbol. */ if (h->dynindx == -1) { if (!bfd_elf32_link_record_dynamic_symbol (info, h)) return false; } /* Allocate space in the .got section. */ sgot->_raw_size += 4; /* Allocate relocation space. */ srelgot->_raw_size += sizeof (Elf32_External_Rela); } else h->got.refcount++; } else { /* This is a global offset table entry for a local symbol. */ if (local_got_refcounts[r_symndx] == -1) { local_got_refcounts[r_symndx] = 1; sgot->_raw_size += 4; 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. */ srelgot->_raw_size += sizeof (Elf32_External_Rela); } } else local_got_refcounts[r_symndx]++; } break; 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. */ /* If this is a local symbol, we resolve it directly without creating a procedure linkage table entry. */ if (h == NULL) continue; h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; if (h->plt.refcount == -1) h->plt.refcount = 1; else 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. 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 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? */ if (abfd->my_archive) (*_bfd_error_handler) (_("%s(%s), section %s:\n relocation %s should not be used in a shared object; recompile with -fPIC"), bfd_get_filename (bfd_my_archive (abfd)), bfd_get_filename (abfd), sec->name, cris_elf_howto_table[r_type].name); else (*_bfd_error_handler) (_("%s, section %s:\n relocation %s should not be used in a shared object; recompile with -fPIC"), bfd_get_filename (abfd), sec->name, cris_elf_howto_table[r_type].name); } /* Fall through. */ case R_CRIS_8_PCREL: case R_CRIS_16_PCREL: case R_CRIS_32_PCREL: if (h != NULL) { h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; /* Make sure a plt entry is created for this symbol if it turns out to be a function defined by a dynamic object. */ if (h->plt.refcount == -1) h->plt.refcount = 1; else 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 can only eliminate PC-relative relocs. */ if (r_type == R_CRIS_8_PCREL || r_type == R_CRIS_16_PCREL || r_type == R_CRIS_32_PCREL) { /* If the symbol is local, then we can eliminate the reloc. */ if (h == NULL) 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->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0) break; } /* We create a reloc section in dynobj and make room for this reloc. */ if (sreloc == NULL) { const char *name; name = (bfd_elf_string_from_elf_section (abfd, elf_elfheader (abfd)->e_shstrndx, elf_section_data (sec)->rel_hdr.sh_name)); if (name == NULL) return false; BFD_ASSERT (strncmp (name, ".rela", 5) == 0 && strcmp (bfd_get_section_name (abfd, sec), name + 5) == 0); sreloc = bfd_get_section_by_name (dynobj, name); if (sreloc == NULL) { sreloc = bfd_make_section (dynobj, name); if (sreloc == NULL || !bfd_set_section_flags (dynobj, sreloc, (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED | SEC_READONLY)) || !bfd_set_section_alignment (dynobj, sreloc, 2)) return false; } } sreloc->_raw_size += sizeof (Elf32_External_Rela); /* If we are linking with -Bsymbolic, 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. */ if ((r_type == R_CRIS_8_PCREL || r_type == R_CRIS_16_PCREL || r_type == R_CRIS_32_PCREL) && info->symbolic) { struct elf_cris_link_hash_entry *eh; struct elf_cris_pcrel_relocs_copied *p; eh = (struct elf_cris_link_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, 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->count; } break; /* This relocation describes the C++ object vtable hierarchy. Reconstruct it for later use during GC. */ case R_CRIS_GNU_VTINHERIT: if (!_bfd_elf32_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: if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) return false; 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 boolean elf_cris_size_dynamic_sections (output_bfd, info) bfd *output_bfd; struct bfd_link_info *info; { bfd *dynobj; asection *s; boolean plt; boolean relocs; boolean reltext; 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->shared) { s = bfd_get_section_by_name (dynobj, ".interp"); BFD_ASSERT (s != NULL); s->_raw_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 (elf_cris_hash_table (info), elf_cris_adjust_gotplt_to_got, (PTR) 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->_raw_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 (elf_cris_hash_table (info), elf_cris_discard_excess_dso_dynamics, (PTR) info); else elf_cris_link_hash_traverse (elf_cris_hash_table (info), elf_cris_discard_excess_program_dynamics, (PTR) 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; reltext = false; for (s = dynobj->sections; s != NULL; s = s->next) { const char *name; boolean strip; 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); strip = false; if (strcmp (name, ".plt") == 0) { if (s->_raw_size == 0) { /* Strip this section if we don't need it; see the comment below. */ strip = true; } else { /* Remember whether there is a PLT. */ plt = true; } } else if (strncmp (name, ".rela", 5) == 0) { if (s->_raw_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. */ strip = true; } else { asection *target; /* Remember whether there are any reloc sections other than .rela.plt. */ if (strcmp (name, ".rela.plt") != 0) { const char *outname; relocs = true; /* If this relocation section applies to a read only section, then we probably need a DT_TEXTREL entry. The entries in the .rela.plt section are actually associated with .got.plt, which we created ourselves and so know is not readonly. */ outname = bfd_get_section_name (output_bfd, s->output_section); target = bfd_get_section_by_name (output_bfd, outname + strlen (".rela")); /* We have to test the .text section by name, becase for some reason it does not have SEC_READONLY set at this time. That flag is actually set in ldmain.c:main specifically for ".text" at a time long after this function is called. FIXME: This might be due to a general bug. FIXME: Have testcase for this. */ if (target != NULL && (target->flags & SEC_ALLOC) != 0 && ((target->flags & SEC_READONLY) != 0 || strcmp (outname + strlen (".rela"), ".text") == 0)) reltext = 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 (strncmp (name, ".got", 4) != 0) { /* It's not one of our sections, so don't allocate space. */ continue; } if (strip) { _bfd_strip_section_from_output (info, s); 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->_raw_size); if (s->contents == NULL && s->_raw_size != 0) 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. */ if (!info->shared) { if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) return false; } if (plt) { if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA) || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) return false; } if (relocs) { if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0) || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0) || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT, sizeof (Elf32_External_Rela))) return false; } if (reltext) { if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) return false; info->flags |= DF_TEXTREL; } } 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 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 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.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 || info->symbolic)) { for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela); } 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 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 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 referred to by a DSO and not defined by a DSO) then lose the reloc for the .got (don't allocate room for it). */ if ((h->root.elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC | ELF_LINK_HASH_DEF_DYNAMIC)) == 0) { if (h->root.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->_raw_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. */ h->root.dynindx = -1; } return true; } /* Reject a file depending on presence and expectation of prefixed underscores on symbols. */ static boolean cris_elf_object_p (abfd) bfd *abfd; { 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. */ static void cris_elf_final_write_processing (abfd, linker) bfd *abfd; boolean linker ATTRIBUTE_UNUSED; { if (bfd_get_symbol_leading_char (abfd) == '_') elf_elfheader (abfd)->e_flags |= EF_CRIS_UNDERSCORE; else elf_elfheader (abfd)->e_flags &= ~EF_CRIS_UNDERSCORE; } /* Display the flags field. */ static 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]")); fputc ('\n', file); return true; } /* Don't mix files with and without a leading underscore. */ static boolean cris_elf_merge_private_bfd_data (ibfd, obfd) bfd *ibfd; bfd *obfd; { flagword old_flags, new_flags; 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; if (! elf_flags_init (obfd)) { /* This happens when ld starts out with a 'blank' output file. */ elf_flags_init (obfd) = true; /* Set flags according to current bfd_target. */ cris_elf_final_write_processing (obfd, false); } old_flags = elf_elfheader (obfd)->e_flags; new_flags = elf_elfheader (ibfd)->e_flags; /* Is this good or bad? We'll follow with other excluding flags. */ if ((old_flags & EF_CRIS_UNDERSCORE) != (new_flags & EF_CRIS_UNDERSCORE)) { (*_bfd_error_handler) ((new_flags & EF_CRIS_UNDERSCORE) ? _("%s: uses _-prefixed symbols, but writing file with non-prefixed symbols") : _("%s: uses non-prefixed symbols, but writing file with _-prefixed symbols"), bfd_get_filename (ibfd)); bfd_set_error (bfd_error_bad_value); return false; } return true; } #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_check_relocs cris_elf_check_relocs #define elf_backend_can_gc_sections 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_reloc_type_lookup cris_reloc_type_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_size_dynamic_sections \ elf_cris_size_dynamic_sections #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_elf32_gc_common_final_link #define elf_backend_hide_symbol elf_cris_hide_symbol #define elf_backend_want_got_plt 1 #define elf_backend_plt_readonly 1 #define elf_backend_want_plt_sym 0 #define elf_backend_got_header_size 12 #define elf_backend_plt_header_size PLT_ENTRY_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 #include "elf32-target.h" #define INCLUDED_TARGET_FILE #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 '_' #include "elf32-target.h"
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