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/* AVR-specific support for 32-bit ELF Copyright (C) 1999, 2000 Free Software Foundation, Inc. Contributed by Denis Chertykov <denisc@overta.ru> 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/avr.h" static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); static void avr_info_to_howto_rela PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); static asection *elf32_avr_gc_mark_hook PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, struct elf_link_hash_entry *, Elf_Internal_Sym *)); static boolean elf32_avr_gc_sweep_hook PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); static boolean elf32_avr_check_relocs PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); static bfd_reloc_status_type avr_final_link_relocate PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma)); static boolean elf32_avr_relocate_section PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); static void bfd_elf_avr_final_write_processing PARAMS ((bfd *, boolean)); static boolean elf32_avr_object_p PARAMS ((bfd *)); /* Use RELA instead of REL */ #undef USE_REL static reloc_howto_type elf_avr_howto_table[] = { HOWTO (R_AVR_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_AVR_NONE", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ false), /* pcrel_offset */ HOWTO (R_AVR_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_AVR_32", /* name */ false, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ false), /* pcrel_offset */ /* A 7 bit PC relative relocation. */ HOWTO (R_AVR_7_PCREL, /* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 7, /* bitsize */ true, /* pc_relative */ 3, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_7_PCREL", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ true), /* pcrel_offset */ /* A 13 bit PC relative relocation. */ HOWTO (R_AVR_13_PCREL, /* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 13, /* bitsize */ true, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_13_PCREL", /* name */ false, /* partial_inplace */ 0xfff, /* src_mask */ 0xfff, /* dst_mask */ true), /* pcrel_offset */ /* A 16 bit absolute relocation. */ HOWTO (R_AVR_16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_16", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A 16 bit absolute relocation for command address. */ HOWTO (R_AVR_16_PM, /* type */ 1, /* 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_AVR_16_PM", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A low 8 bit absolute relocation of 16 bit address. For LDI command. */ HOWTO (R_AVR_LO8_LDI, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_LO8_LDI", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A high 8 bit absolute relocation of 16 bit address. For LDI command. */ HOWTO (R_AVR_HI8_LDI, /* type */ 8, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_HI8_LDI", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A high 6 bit absolute relocation of 22 bit address. For LDI command. */ HOWTO (R_AVR_HH8_LDI, /* type */ 16, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_HH8_LDI", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A negative low 8 bit absolute relocation of 16 bit address. For LDI command. */ HOWTO (R_AVR_LO8_LDI_NEG, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_LO8_LDI_NEG", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A hegative high 8 bit absolute relocation of 16 bit address. For LDI command. */ HOWTO (R_AVR_HI8_LDI_NEG, /* type */ 8, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_HI8_LDI_NEG", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A hegative high 6 bit absolute relocation of 22 bit address. For LDI command. */ HOWTO (R_AVR_HH8_LDI_NEG, /* type */ 16, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_HH8_LDI_NEG", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A low 8 bit absolute relocation of 24 bit program memory address. For LDI command. */ HOWTO (R_AVR_LO8_LDI_PM, /* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_LO8_LDI_PM", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A high 8 bit absolute relocation of 16 bit program memory address. For LDI command. */ HOWTO (R_AVR_HI8_LDI_PM, /* type */ 9, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_HI8_LDI_PM", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A high 8 bit absolute relocation of 24 bit program memory address. For LDI command. */ HOWTO (R_AVR_HH8_LDI_PM, /* type */ 17, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_HH8_LDI_PM", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A low 8 bit absolute relocation of a negative 24 bit program memory address. For LDI command. */ HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_LO8_LDI_PM_NEG", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A high 8 bit absolute relocation of a negative 16 bit program memory address. For LDI command. */ HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */ 9, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_HI8_LDI_PM_NEG", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* A high 8 bit absolute relocation of a negative 24 bit program memory address. For LDI command. */ HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */ 17, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_HH8_LDI_PM_NEG", /* name */ false, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ false), /* pcrel_offset */ /* Relocation for CALL command in ATmega. */ HOWTO (R_AVR_CALL, /* type */ 1, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 23, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_AVR_CALL", /* name */ false, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ false) /* pcrel_offset */ }; /* Map BFD reloc types to AVR ELF reloc types. */ struct avr_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned int elf_reloc_val; }; static const struct avr_reloc_map avr_reloc_map[] = { { BFD_RELOC_NONE, R_AVR_NONE }, { BFD_RELOC_32, R_AVR_32 }, { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL }, { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL }, { BFD_RELOC_16, R_AVR_16 }, { BFD_RELOC_AVR_16_PM, R_AVR_16_PM }, { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI}, { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI }, { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI }, { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG }, { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG }, { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG }, { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM }, { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM }, { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM }, { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG }, { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG }, { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG }, { BFD_RELOC_AVR_CALL, R_AVR_CALL } }; static reloc_howto_type * bfd_elf32_bfd_reloc_type_lookup (abfd, code) bfd *abfd; bfd_reloc_code_real_type code; { unsigned int i; for (i = 0; i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map); i++) { if (avr_reloc_map[i].bfd_reloc_val == code) return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val]; } return NULL; } /* Set the howto pointer for an AVR ELF reloc. */ static void avr_info_to_howto_rela (abfd, cache_ptr, dst) bfd *abfd; 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_AVR_max); cache_ptr->howto = &elf_avr_howto_table[r_type]; } static asection * elf32_avr_gc_mark_hook (abfd, info, rel, h, sym) bfd *abfd; struct bfd_link_info *info; Elf_Internal_Rela *rel; struct elf_link_hash_entry *h; Elf_Internal_Sym *sym; { if (h != NULL) { switch (ELF32_R_TYPE (rel->r_info)) { 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; } static boolean elf32_avr_gc_sweep_hook (abfd, info, sec, relocs) bfd *abfd; struct bfd_link_info *info; asection *sec; const Elf_Internal_Rela *relocs; { /* We don't use got and plt entries for avr. */ return true; } /* Look through the relocs for a section during the first phase. Since we don't do .gots or .plts, we just need to consider the virtual table relocs for gc. */ static boolean elf32_avr_check_relocs (abfd, info, sec, relocs) bfd *abfd; struct bfd_link_info *info; asection *sec; const Elf_Internal_Rela *relocs; { Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; const Elf_Internal_Rela *rel; const Elf_Internal_Rela *rel_end; if (info->relocateable) return true; 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); 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; 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]; } return true; } /* Perform a single relocation. By default we use the standard BFD routines, but a few relocs, we have to do them ourselves. */ static bfd_reloc_status_type avr_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 = bfd_reloc_ok; bfd_vma x; bfd_signed_vma srel; switch (howto->type) { case R_AVR_7_PCREL: contents += rel->r_offset; srel = (bfd_signed_vma) relocation; srel += rel->r_addend; srel -= rel->r_offset; srel -= 2; /* Branch instructions add 2 to the PC... */ srel -= (input_section->output_section->vma + input_section->output_offset); if (srel & 1) return bfd_reloc_outofrange; if (srel > ((1 << 7) - 1) || (srel < - (1 << 7))) return bfd_reloc_overflow; x = bfd_get_16 (input_bfd, contents); x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_13_PCREL: contents += rel->r_offset; srel = (bfd_signed_vma) relocation; srel += rel->r_addend; srel -= rel->r_offset; srel -= 2; /* Branch instructions add 2 to the PC... */ srel -= (input_section->output_section->vma + input_section->output_offset); if (srel & 1) return bfd_reloc_outofrange; /* AVR addresses commands as words. */ srel >>= 1; /* Check for overflow. */ if (srel < -2048 || srel > 2047) { /* Apply WRAPAROUND if possible. */ if (bfd_get_mach (input_bfd) == bfd_mach_avr2) { if (srel > 2047) srel -= 4096; else srel += 4096; } else return bfd_reloc_overflow; } x = bfd_get_16 (input_bfd, contents); x = (x & 0xf000) | (srel & 0xfff); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_LO8_LDI: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_HI8_LDI: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; srel = (srel >> 8) & 0xff; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_HH8_LDI: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; srel = (srel >> 16) & 0xff; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_LO8_LDI_NEG: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; srel = -srel; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_HI8_LDI_NEG: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; srel = -srel; srel = (srel >> 8) & 0xff; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_HH8_LDI_NEG: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; srel = -srel; srel = (srel >> 16) & 0xff; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_LO8_LDI_PM: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; if (srel & 1) return bfd_reloc_outofrange; srel = srel >> 1; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_HI8_LDI_PM: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; if (srel & 1) return bfd_reloc_outofrange; srel = srel >> 1; srel = (srel >> 8) & 0xff; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_HH8_LDI_PM: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; if (srel & 1) return bfd_reloc_outofrange; srel = srel >> 1; srel = (srel >> 16) & 0xff; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_LO8_LDI_PM_NEG: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; srel = -srel; if (srel & 1) return bfd_reloc_outofrange; srel = srel >> 1; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_HI8_LDI_PM_NEG: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; srel = -srel; if (srel & 1) return bfd_reloc_outofrange; srel = srel >> 1; srel = (srel >> 8) & 0xff; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_HH8_LDI_PM_NEG: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; srel = -srel; if (srel & 1) return bfd_reloc_outofrange; srel = srel >> 1; srel = (srel >> 16) & 0xff; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); bfd_put_16 (input_bfd, x, contents); break; case R_AVR_CALL: contents += rel->r_offset; srel = (bfd_signed_vma) relocation + rel->r_addend; if (srel & 1) return bfd_reloc_outofrange; srel = srel >> 1; x = bfd_get_16 (input_bfd, contents); x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16; bfd_put_16 (input_bfd, x, contents); bfd_put_16 (input_bfd, srel & 0xffff, contents+2); break; default: r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, rel->r_offset, relocation, rel->r_addend); } return r; } /* Relocate an AVR ELF section. */ static boolean elf32_avr_relocate_section (output_bfd, info, input_bfd, input_section, contents, relocs, local_syms, local_sections) bfd *output_bfd; struct bfd_link_info *info; bfd *input_bfd; asection *input_section; bfd_byte *contents; Elf_Internal_Rela *relocs; Elf_Internal_Sym *local_syms; asection **local_sections; { Elf_Internal_Shdr * symtab_hdr; struct elf_link_hash_entry ** sym_hashes; Elf_Internal_Rela * rel; Elf_Internal_Rela * relend; symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; sym_hashes = elf_sym_hashes (input_bfd); relend = relocs + input_section->reloc_count; 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); 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 = elf_avr_howto_table + ELF32_R_TYPE (rel->r_info); 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; relocation = (h->root.u.def.value + sec->output_section->vma + sec->output_offset); } else if (h->root.type == bfd_link_hash_undefweak) { relocation = 0; } else { if (! ((*info->callbacks->undefined_symbol) (info, h->root.root.string, input_bfd, input_section, rel->r_offset, true))) return false; relocation = 0; } } r = avr_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; } /* The final processing done just before writing out a AVR ELF object file. This gets the AVR architecture right based on the machine number. */ static void bfd_elf_avr_final_write_processing (abfd, linker) bfd *abfd; boolean linker ATTRIBUTE_UNUSED; { unsigned long val; switch (bfd_get_mach (abfd)) { default: case bfd_mach_avr2: val = E_AVR_MACH_AVR2; break; case bfd_mach_avr1: val = E_AVR_MACH_AVR1; break; case bfd_mach_avr3: val = E_AVR_MACH_AVR3; break; case bfd_mach_avr4: val = E_AVR_MACH_AVR4; break; } elf_elfheader (abfd)->e_machine = EM_AVR; elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH; elf_elfheader (abfd)->e_flags |= val; } /* Set the right machine number. */ static boolean elf32_avr_object_p (abfd) bfd *abfd; { int e_set = bfd_mach_avr2; if (elf_elfheader (abfd)->e_machine == EM_AVR) { int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH; switch (e_mach) { default: case E_AVR_MACH_AVR2: e_set = bfd_mach_avr2; break; case E_AVR_MACH_AVR1: e_set = bfd_mach_avr1; break; case E_AVR_MACH_AVR3: e_set = bfd_mach_avr3; break; case E_AVR_MACH_AVR4: e_set = bfd_mach_avr4; break; } } return bfd_default_set_arch_mach (abfd, bfd_arch_avr, e_set); } #define ELF_ARCH bfd_arch_avr #define ELF_MACHINE_CODE EM_AVR #define ELF_MAXPAGESIZE 1 #define TARGET_LITTLE_SYM bfd_elf32_avr_vec #define TARGET_LITTLE_NAME "elf32-avr" #define elf_info_to_howto avr_info_to_howto_rela #define elf_info_to_howto_rel NULL #define elf_backend_relocate_section elf32_avr_relocate_section #define elf_backend_gc_mark_hook elf32_avr_gc_mark_hook #define elf_backend_gc_sweep_hook elf32_avr_gc_sweep_hook #define elf_backend_check_relocs elf32_avr_check_relocs #define elf_backend_can_gc_sections 1 #define elf_backend_final_write_processing \ bfd_elf_avr_final_write_processing #define elf_backend_object_p elf32_avr_object_p #include "elf32-target.h"