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- /* AVR-specific support for 32-bit ELF
- Copyright (C) 1999-2022 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 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street - Fifth Floor,
- Boston, MA 02110-1301, USA. */
- #include "sysdep.h"
- #include "bfd.h"
- #include "libbfd.h"
- #include "elf-bfd.h"
- #include "elf/avr.h"
- #include "elf32-avr.h"
- /* Enable debugging printout at stdout with this variable. */
- static bool debug_relax = false;
- /* Enable debugging printout at stdout with this variable. */
- static bool debug_stubs = false;
- static bfd_reloc_status_type
- bfd_elf_avr_diff_reloc (bfd *, arelent *, asymbol *, void *,
- asection *, bfd *, char **);
- /* Hash table initialization and handling. Code is taken from the hppa port
- and adapted to the needs of AVR. */
- /* We use two hash tables to hold information for linking avr objects.
- The first is the elf32_avr_link_hash_table which is derived from the
- stanard ELF linker hash table. We use this as a place to attach the other
- hash table and some static information.
- The second is the stub hash table which is derived from the base BFD
- hash table. The stub hash table holds the information on the linker
- stubs. */
- struct elf32_avr_stub_hash_entry
- {
- /* Base hash table entry structure. */
- struct bfd_hash_entry bh_root;
- /* Offset within stub_sec of the beginning of this stub. */
- bfd_vma stub_offset;
- /* Given the symbol's value and its section we can determine its final
- value when building the stubs (so the stub knows where to jump). */
- bfd_vma target_value;
- /* This way we could mark stubs to be no longer necessary. */
- bool is_actually_needed;
- };
- struct elf32_avr_link_hash_table
- {
- /* The main hash table. */
- struct elf_link_hash_table etab;
- /* The stub hash table. */
- struct bfd_hash_table bstab;
- bool no_stubs;
- /* Linker stub bfd. */
- bfd *stub_bfd;
- /* The stub section. */
- asection *stub_sec;
- /* Usually 0, unless we are generating code for a bootloader. Will
- be initialized by elf32_avr_size_stubs to the vma offset of the
- output section associated with the stub section. */
- bfd_vma vector_base;
- /* Assorted information used by elf32_avr_size_stubs. */
- unsigned int bfd_count;
- unsigned int top_index;
- asection ** input_list;
- Elf_Internal_Sym ** all_local_syms;
- /* Tables for mapping vma beyond the 128k boundary to the address of the
- corresponding stub. (AMT)
- "amt_max_entry_cnt" reflects the number of entries that memory is allocated
- for in the "amt_stub_offsets" and "amt_destination_addr" arrays.
- "amt_entry_cnt" informs how many of these entries actually contain
- useful data. */
- unsigned int amt_entry_cnt;
- unsigned int amt_max_entry_cnt;
- bfd_vma * amt_stub_offsets;
- bfd_vma * amt_destination_addr;
- };
- /* Various hash macros and functions. */
- #define avr_link_hash_table(p) \
- ((is_elf_hash_table ((p)->hash) \
- && elf_hash_table_id (elf_hash_table (p)) == AVR_ELF_DATA) \
- ? (struct elf32_avr_link_hash_table *) (p)->hash : NULL)
- #define avr_stub_hash_entry(ent) \
- ((struct elf32_avr_stub_hash_entry *)(ent))
- #define avr_stub_hash_lookup(table, string, create, copy) \
- ((struct elf32_avr_stub_hash_entry *) \
- bfd_hash_lookup ((table), (string), (create), (copy)))
- static reloc_howto_type elf_avr_howto_table[] =
- {
- HOWTO (R_AVR_NONE, /* type */
- 0, /* rightshift */
- 3, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* 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
- Will be changed when linker stubs are needed. */
- 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. As well second most significant 8 bit value of
- a 32 bit link-time constant. */
- 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 negative 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 negative 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. Will not be changed when linker stubs are needed. */
- 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 low 8 bit absolute relocation of 24 bit program memory address.
- For LDI command. Will not be changed when linker stubs are needed. */
- 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 low 8 bit absolute relocation of 24 bit program memory address.
- For LDI command. Will not be changed when linker stubs are needed. */
- 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 24 bit program memory address.
- For LDI command. Will not be changed when linker stubs are needed. */
- 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 low 8 bit absolute relocation of 24 bit program memory address.
- For LDI command. Will not be changed when linker stubs are needed. */
- 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 low 8 bit absolute relocation of 24 bit program memory address.
- For LDI command. Will not be changed when linker stubs are needed. */
- 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 */
- /* A 16 bit absolute relocation of 16 bit address.
- For LDI command. */
- HOWTO (R_AVR_LDI, /* 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_LDI", /* name */
- false, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- /* A 6 bit absolute relocation of 6 bit offset.
- For ldd/sdd command. */
- HOWTO (R_AVR_6, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 6, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont,/* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_AVR_6", /* name */
- false, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- /* A 6 bit absolute relocation of 6 bit offset.
- For sbiw/adiw command. */
- HOWTO (R_AVR_6_ADIW, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 6, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont,/* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_AVR_6_ADIW", /* name */
- false, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- /* Most significant 8 bit value of a 32 bit link-time constant. */
- HOWTO (R_AVR_MS8_LDI, /* type */
- 24, /* 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_MS8_LDI", /* name */
- false, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- /* Negative most significant 8 bit value of a 32 bit link-time constant. */
- HOWTO (R_AVR_MS8_LDI_NEG, /* type */
- 24, /* 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_MS8_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. Will be changed when linker stubs are needed. */
- HOWTO (R_AVR_LO8_LDI_GS, /* 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_GS", /* 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. Will be changed when linker stubs are needed. */
- HOWTO (R_AVR_HI8_LDI_GS, /* 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_GS", /* name */
- false, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- /* 8 bit offset. */
- HOWTO (R_AVR_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_AVR_8", /* name */
- false, /* partial_inplace */
- 0x000000ff, /* src_mask */
- 0x000000ff, /* dst_mask */
- false), /* pcrel_offset */
- /* lo8-part to use in .byte lo8(sym). */
- HOWTO (R_AVR_8_LO8, /* type */
- 0, /* rightshift */
- 0, /* 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_8_LO8", /* name */
- false, /* partial_inplace */
- 0xffffff, /* src_mask */
- 0xffffff, /* dst_mask */
- false), /* pcrel_offset */
- /* hi8-part to use in .byte hi8(sym). */
- HOWTO (R_AVR_8_HI8, /* type */
- 8, /* rightshift */
- 0, /* 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_8_HI8", /* name */
- false, /* partial_inplace */
- 0xffffff, /* src_mask */
- 0xffffff, /* dst_mask */
- false), /* pcrel_offset */
- /* hlo8-part to use in .byte hlo8(sym). */
- HOWTO (R_AVR_8_HLO8, /* type */
- 16, /* rightshift */
- 0, /* 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_8_HLO8", /* name */
- false, /* partial_inplace */
- 0xffffff, /* src_mask */
- 0xffffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_AVR_DIFF8, /* 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_avr_diff_reloc, /* special_function */
- "R_AVR_DIFF8", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_AVR_DIFF16, /* 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_avr_diff_reloc,/* special_function */
- "R_AVR_DIFF16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_AVR_DIFF32, /* 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_avr_diff_reloc,/* special_function */
- "R_AVR_DIFF32", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffffff, /* dst_mask */
- false), /* pcrel_offset */
- /* 7 bit immediate for LDS/STS in Tiny core. */
- HOWTO (R_AVR_LDS_STS_16, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 7, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont,/* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_AVR_LDS_STS_16", /* name */
- false, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_AVR_PORT6, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 6, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont,/* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_AVR_PORT6", /* name */
- false, /* partial_inplace */
- 0xffffff, /* src_mask */
- 0xffffff, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_AVR_PORT5, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 5, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont,/* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_AVR_PORT5", /* name */
- false, /* partial_inplace */
- 0xffffff, /* src_mask */
- 0xffffff, /* dst_mask */
- false), /* pcrel_offset */
- /* A 32 bit PC relative relocation. */
- HOWTO (R_AVR_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_AVR_32_PCREL", /* name */
- false, /* partial_inplace */
- 0xffffffff, /* src_mask */
- 0xffffffff, /* dst_mask */
- true), /* 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_MS8_LDI, R_AVR_MS8_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_MS8_LDI_NEG, R_AVR_MS8_LDI_NEG },
- { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM },
- { BFD_RELOC_AVR_LO8_LDI_GS, R_AVR_LO8_LDI_GS },
- { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM },
- { BFD_RELOC_AVR_HI8_LDI_GS, R_AVR_HI8_LDI_GS },
- { 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 },
- { BFD_RELOC_AVR_LDI, R_AVR_LDI },
- { BFD_RELOC_AVR_6, R_AVR_6 },
- { BFD_RELOC_AVR_6_ADIW, R_AVR_6_ADIW },
- { BFD_RELOC_8, R_AVR_8 },
- { BFD_RELOC_AVR_8_LO, R_AVR_8_LO8 },
- { BFD_RELOC_AVR_8_HI, R_AVR_8_HI8 },
- { BFD_RELOC_AVR_8_HLO, R_AVR_8_HLO8 },
- { BFD_RELOC_AVR_DIFF8, R_AVR_DIFF8 },
- { BFD_RELOC_AVR_DIFF16, R_AVR_DIFF16 },
- { BFD_RELOC_AVR_DIFF32, R_AVR_DIFF32 },
- { BFD_RELOC_AVR_LDS_STS_16, R_AVR_LDS_STS_16},
- { BFD_RELOC_AVR_PORT6, R_AVR_PORT6},
- { BFD_RELOC_AVR_PORT5, R_AVR_PORT5},
- { BFD_RELOC_32_PCREL, R_AVR_32_PCREL}
- };
- static const struct bfd_elf_special_section elf_avr_special_sections[] =
- {
- { STRING_COMMA_LEN (".noinit"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
- { NULL, 0, 0, 0, 0 }
- };
- /* Meant to be filled one day with the wrap around address for the
- specific device. I.e. should get the value 0x4000 for 16k devices,
- 0x8000 for 32k devices and so on.
- We initialize it here with a value of 0x1000000 resulting in
- that we will never suggest a wrap-around jump during relaxation.
- The logic of the source code later on assumes that in
- avr_pc_wrap_around one single bit is set. */
- static bfd_vma avr_pc_wrap_around = 0x10000000;
- /* If this variable holds a value different from zero, the linker relaxation
- machine will try to optimize call/ret sequences by a single jump
- instruction. This option could be switched off by a linker switch. */
- static int avr_replace_call_ret_sequences = 1;
- /* Per-section relaxation related information for avr. */
- struct avr_relax_info
- {
- /* Track the avr property records that apply to this section. */
- struct
- {
- /* Number of records in the list. */
- unsigned count;
- /* How many records worth of space have we allocated. */
- unsigned allocated;
- /* The records, only COUNT records are initialised. */
- struct avr_property_record *items;
- } records;
- };
- /* Per section data, specialised for avr. */
- struct elf_avr_section_data
- {
- /* The standard data must appear first. */
- struct bfd_elf_section_data elf;
- /* Relaxation related information. */
- struct avr_relax_info relax_info;
- };
- /* Possibly initialise avr specific data for new section SEC from ABFD. */
- static bool
- elf_avr_new_section_hook (bfd *abfd, asection *sec)
- {
- if (!sec->used_by_bfd)
- {
- struct elf_avr_section_data *sdata;
- size_t amt = sizeof (*sdata);
- sdata = bfd_zalloc (abfd, amt);
- if (sdata == NULL)
- return false;
- sec->used_by_bfd = sdata;
- }
- return _bfd_elf_new_section_hook (abfd, sec);
- }
- /* Return a pointer to the relaxation information for SEC. */
- static struct avr_relax_info *
- get_avr_relax_info (asection *sec)
- {
- struct elf_avr_section_data *section_data;
- /* No info available if no section or if it is an output section. */
- if (!sec || sec == sec->output_section)
- return NULL;
- section_data = (struct elf_avr_section_data *) elf_section_data (sec);
- return §ion_data->relax_info;
- }
- /* Initialise the per section relaxation information for SEC. */
- static void
- init_avr_relax_info (asection *sec)
- {
- struct avr_relax_info *relax_info = get_avr_relax_info (sec);
- relax_info->records.count = 0;
- relax_info->records.allocated = 0;
- relax_info->records.items = NULL;
- }
- /* Initialize an entry in the stub hash table. */
- static struct bfd_hash_entry *
- stub_hash_newfunc (struct bfd_hash_entry *entry,
- struct bfd_hash_table *table,
- const char *string)
- {
- /* Allocate the structure if it has not already been allocated by a
- subclass. */
- if (entry == NULL)
- {
- entry = bfd_hash_allocate (table,
- sizeof (struct elf32_avr_stub_hash_entry));
- if (entry == NULL)
- return entry;
- }
- /* Call the allocation method of the superclass. */
- entry = bfd_hash_newfunc (entry, table, string);
- if (entry != NULL)
- {
- struct elf32_avr_stub_hash_entry *hsh;
- /* Initialize the local fields. */
- hsh = avr_stub_hash_entry (entry);
- hsh->stub_offset = 0;
- hsh->target_value = 0;
- }
- return entry;
- }
- /* This function is just a straight passthrough to the real
- function in linker.c. Its prupose is so that its address
- can be compared inside the avr_link_hash_table macro. */
- static struct bfd_hash_entry *
- elf32_avr_link_hash_newfunc (struct bfd_hash_entry * entry,
- struct bfd_hash_table * table,
- const char * string)
- {
- return _bfd_elf_link_hash_newfunc (entry, table, string);
- }
- /* Free the derived linker hash table. */
- static void
- elf32_avr_link_hash_table_free (bfd *obfd)
- {
- struct elf32_avr_link_hash_table *htab
- = (struct elf32_avr_link_hash_table *) obfd->link.hash;
- /* Free the address mapping table. */
- free (htab->amt_stub_offsets);
- free (htab->amt_destination_addr);
- bfd_hash_table_free (&htab->bstab);
- _bfd_elf_link_hash_table_free (obfd);
- }
- /* Create the derived linker hash table. The AVR ELF port uses the derived
- hash table to keep information specific to the AVR ELF linker (without
- using static variables). */
- static struct bfd_link_hash_table *
- elf32_avr_link_hash_table_create (bfd *abfd)
- {
- struct elf32_avr_link_hash_table *htab;
- size_t amt = sizeof (*htab);
- htab = bfd_zmalloc (amt);
- if (htab == NULL)
- return NULL;
- if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd,
- elf32_avr_link_hash_newfunc,
- sizeof (struct elf_link_hash_entry),
- AVR_ELF_DATA))
- {
- free (htab);
- return NULL;
- }
- /* Init the stub hash table too. */
- if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc,
- sizeof (struct elf32_avr_stub_hash_entry)))
- {
- _bfd_elf_link_hash_table_free (abfd);
- return NULL;
- }
- htab->etab.root.hash_table_free = elf32_avr_link_hash_table_free;
- return &htab->etab.root;
- }
- /* Calculates the effective distance of a pc relative jump/call. */
- static int
- avr_relative_distance_considering_wrap_around (unsigned int distance)
- {
- unsigned int wrap_around_mask = avr_pc_wrap_around - 1;
- int dist_with_wrap_around = distance & wrap_around_mask;
- if (dist_with_wrap_around >= ((int) (avr_pc_wrap_around >> 1)))
- dist_with_wrap_around -= avr_pc_wrap_around;
- return dist_with_wrap_around;
- }
- static reloc_howto_type *
- bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
- 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;
- }
- static reloc_howto_type *
- bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
- const char *r_name)
- {
- unsigned int i;
- for (i = 0;
- i < sizeof (elf_avr_howto_table) / sizeof (elf_avr_howto_table[0]);
- i++)
- if (elf_avr_howto_table[i].name != NULL
- && strcasecmp (elf_avr_howto_table[i].name, r_name) == 0)
- return &elf_avr_howto_table[i];
- return NULL;
- }
- /* Set the howto pointer for an AVR ELF reloc. */
- static bool
- avr_info_to_howto_rela (bfd *abfd,
- arelent *cache_ptr,
- Elf_Internal_Rela *dst)
- {
- unsigned int r_type;
- r_type = ELF32_R_TYPE (dst->r_info);
- if (r_type >= (unsigned int) R_AVR_max)
- {
- /* xgettext:c-format */
- _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
- abfd, r_type);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- cache_ptr->howto = &elf_avr_howto_table[r_type];
- return true;
- }
- static bool
- avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation)
- {
- return (relocation >= 0x020000);
- }
- /* Returns the address of the corresponding stub if there is one.
- Returns otherwise an address above 0x020000. This function
- could also be used, if there is no knowledge on the section where
- the destination is found. */
- static bfd_vma
- avr_get_stub_addr (bfd_vma srel,
- struct elf32_avr_link_hash_table *htab)
- {
- unsigned int sindex;
- bfd_vma stub_sec_addr =
- (htab->stub_sec->output_section->vma +
- htab->stub_sec->output_offset);
- for (sindex = 0; sindex < htab->amt_max_entry_cnt; sindex ++)
- if (htab->amt_destination_addr[sindex] == srel)
- return htab->amt_stub_offsets[sindex] + stub_sec_addr;
- /* Return an address that could not be reached by 16 bit relocs. */
- return 0x020000;
- }
- /* Perform a diff relocation. Nothing to do, as the difference value is already
- written into the section's contents. */
- static bfd_reloc_status_type
- bfd_elf_avr_diff_reloc (bfd *abfd ATTRIBUTE_UNUSED,
- arelent *reloc_entry ATTRIBUTE_UNUSED,
- asymbol *symbol ATTRIBUTE_UNUSED,
- void *data ATTRIBUTE_UNUSED,
- asection *input_section ATTRIBUTE_UNUSED,
- bfd *output_bfd ATTRIBUTE_UNUSED,
- char **error_message ATTRIBUTE_UNUSED)
- {
- return bfd_reloc_ok;
- }
- /* 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 (reloc_howto_type * howto,
- bfd * input_bfd,
- asection * input_section,
- bfd_byte * contents,
- Elf_Internal_Rela * rel,
- bfd_vma relocation,
- struct elf32_avr_link_hash_table * htab)
- {
- bfd_reloc_status_type r = bfd_reloc_ok;
- bfd_vma x;
- bfd_signed_vma srel;
- bfd_signed_vma reloc_addr;
- bool use_stubs = false;
- /* Usually is 0, unless we are generating code for a bootloader. */
- bfd_signed_vma base_addr = htab->vector_base;
- /* Absolute addr of the reloc in the final excecutable. */
- reloc_addr = rel->r_offset + input_section->output_section->vma
- + input_section->output_offset;
- 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) * 8) & 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;
- srel = avr_relative_distance_considering_wrap_around (srel);
- /* AVR addresses commands as words. */
- srel >>= 1;
- /* Check for overflow. */
- if (srel < -2048 || srel > 2047)
- {
- /* Relative distance is too large. */
- /* Always apply WRAPAROUND for avr2, avr25, and avr4. */
- switch (bfd_get_mach (input_bfd))
- {
- case bfd_mach_avr2:
- case bfd_mach_avr25:
- case bfd_mach_avr4:
- break;
- default:
- 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_LDI:
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- if (((srel > 0) && (srel & 0xffff) > 255)
- || ((srel < 0) && ((-srel) & 0xffff) > 128))
- /* Remove offset for data/eeprom section. */
- return bfd_reloc_overflow;
- 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_6:
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- if (((srel & 0xffff) > 63) || (srel < 0))
- /* Remove offset for data/eeprom section. */
- return bfd_reloc_overflow;
- x = bfd_get_16 (input_bfd, contents);
- x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7)
- | ((srel & (1 << 5)) << 8));
- bfd_put_16 (input_bfd, x, contents);
- break;
- case R_AVR_6_ADIW:
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- if (((srel & 0xffff) > 63) || (srel < 0))
- /* Remove offset for data/eeprom section. */
- return bfd_reloc_overflow;
- x = bfd_get_16 (input_bfd, contents);
- x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2);
- 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_MS8_LDI:
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- srel = (srel >> 24) & 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_MS8_LDI_NEG:
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- srel = -srel;
- srel = (srel >> 24) & 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_GS:
- use_stubs = (!htab->no_stubs);
- /* Fall through. */
- case R_AVR_LO8_LDI_PM:
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- if (use_stubs
- && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
- {
- bfd_vma old_srel = srel;
- /* We need to use the address of the stub instead. */
- srel = avr_get_stub_addr (srel, htab);
- if (debug_stubs)
- printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
- "reloc at address 0x%x.\n",
- (unsigned int) srel,
- (unsigned int) old_srel,
- (unsigned int) reloc_addr);
- if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
- return bfd_reloc_outofrange;
- }
- 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_GS:
- use_stubs = (!htab->no_stubs);
- /* Fall through. */
- case R_AVR_HI8_LDI_PM:
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- if (use_stubs
- && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
- {
- bfd_vma old_srel = srel;
- /* We need to use the address of the stub instead. */
- srel = avr_get_stub_addr (srel, htab);
- if (debug_stubs)
- printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
- "reloc at address 0x%x.\n",
- (unsigned int) srel,
- (unsigned int) old_srel,
- (unsigned int) reloc_addr);
- if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
- return bfd_reloc_outofrange;
- }
- 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, (bfd_vma) srel & 0xffff, contents+2);
- break;
- case R_AVR_16_PM:
- use_stubs = (!htab->no_stubs);
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- if (use_stubs
- && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
- {
- bfd_vma old_srel = srel;
- /* We need to use the address of the stub instead. */
- srel = avr_get_stub_addr (srel,htab);
- if (debug_stubs)
- printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
- "reloc at address 0x%x.\n",
- (unsigned int) srel,
- (unsigned int) old_srel,
- (unsigned int) reloc_addr);
- if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
- return bfd_reloc_outofrange;
- }
- if (srel & 1)
- return bfd_reloc_outofrange;
- srel = srel >> 1;
- bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents);
- break;
- case R_AVR_DIFF8:
- case R_AVR_DIFF16:
- case R_AVR_DIFF32:
- /* Nothing to do here, as contents already contains the diff value. */
- r = bfd_reloc_ok;
- break;
- case R_AVR_LDS_STS_16:
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- if ((srel & 0xFFFF) < 0x40 || (srel & 0xFFFF) > 0xbf)
- return bfd_reloc_outofrange;
- srel = srel & 0x7f;
- x = bfd_get_16 (input_bfd, contents);
- x |= (srel & 0x0f) | ((srel & 0x30) << 5) | ((srel & 0x40) << 2);
- bfd_put_16 (input_bfd, x, contents);
- break;
- case R_AVR_PORT6:
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- if ((srel & 0xffff) > 0x3f)
- return bfd_reloc_outofrange;
- x = bfd_get_16 (input_bfd, contents);
- x = (x & 0xf9f0) | ((srel & 0x30) << 5) | (srel & 0x0f);
- bfd_put_16 (input_bfd, x, contents);
- break;
- case R_AVR_PORT5:
- contents += rel->r_offset;
- srel = (bfd_signed_vma) relocation + rel->r_addend;
- if ((srel & 0xffff) > 0x1f)
- return bfd_reloc_outofrange;
- x = bfd_get_16 (input_bfd, contents);
- x = (x & 0xff07) | ((srel & 0x1f) << 3);
- bfd_put_16 (input_bfd, x, contents);
- 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 int
- elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
- struct bfd_link_info *info,
- bfd *input_bfd,
- asection *input_section,
- bfd_byte *contents,
- Elf_Internal_Rela *relocs,
- Elf_Internal_Sym *local_syms,
- asection **local_sections)
- {
- Elf_Internal_Shdr * symtab_hdr;
- struct elf_link_hash_entry ** sym_hashes;
- Elf_Internal_Rela * rel;
- Elf_Internal_Rela * relend;
- struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info);
- if (htab == NULL)
- return false;
- 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;
- int r_type;
- r_type = ELF32_R_TYPE (rel->r_info);
- r_symndx = ELF32_R_SYM (rel->r_info);
- howto = elf_avr_howto_table + r_type;
- h = NULL;
- sym = NULL;
- sec = NULL;
- if (r_symndx < symtab_hdr->sh_info)
- {
- sym = local_syms + r_symndx;
- sec = local_sections [r_symndx];
- relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
- name = bfd_elf_string_from_elf_section
- (input_bfd, symtab_hdr->sh_link, sym->st_name);
- name = name == NULL ? bfd_section_name (sec) : name;
- }
- else
- {
- bool unresolved_reloc, warned, ignored;
- RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
- r_symndx, symtab_hdr, sym_hashes,
- h, sec, relocation,
- unresolved_reloc, warned, ignored);
- name = h->root.root.string;
- }
- if (sec != NULL && discarded_section (sec))
- RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
- rel, 1, relend, howto, 0, contents);
- if (bfd_link_relocatable (info))
- continue;
- r = avr_final_link_relocate (howto, input_bfd, input_section,
- contents, rel, relocation, htab);
- if (r != bfd_reloc_ok)
- {
- const char * msg = (const char *) NULL;
- switch (r)
- {
- case bfd_reloc_overflow:
- (*info->callbacks->reloc_overflow)
- (info, (h ? &h->root : NULL), name, howto->name,
- (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
- break;
- case bfd_reloc_undefined:
- (*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)
- (*info->callbacks->warning) (info, msg, name, input_bfd,
- input_section, rel->r_offset);
- }
- }
- 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 bool
- bfd_elf_avr_final_write_processing (bfd *abfd)
- {
- 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_avr25:
- val = E_AVR_MACH_AVR25;
- break;
- case bfd_mach_avr3:
- val = E_AVR_MACH_AVR3;
- break;
- case bfd_mach_avr31:
- val = E_AVR_MACH_AVR31;
- break;
- case bfd_mach_avr35:
- val = E_AVR_MACH_AVR35;
- break;
- case bfd_mach_avr4:
- val = E_AVR_MACH_AVR4;
- break;
- case bfd_mach_avr5:
- val = E_AVR_MACH_AVR5;
- break;
- case bfd_mach_avr51:
- val = E_AVR_MACH_AVR51;
- break;
- case bfd_mach_avr6:
- val = E_AVR_MACH_AVR6;
- break;
- case bfd_mach_avrxmega1:
- val = E_AVR_MACH_XMEGA1;
- break;
- case bfd_mach_avrxmega2:
- val = E_AVR_MACH_XMEGA2;
- break;
- case bfd_mach_avrxmega3:
- val = E_AVR_MACH_XMEGA3;
- break;
- case bfd_mach_avrxmega4:
- val = E_AVR_MACH_XMEGA4;
- break;
- case bfd_mach_avrxmega5:
- val = E_AVR_MACH_XMEGA5;
- break;
- case bfd_mach_avrxmega6:
- val = E_AVR_MACH_XMEGA6;
- break;
- case bfd_mach_avrxmega7:
- val = E_AVR_MACH_XMEGA7;
- break;
- case bfd_mach_avrtiny:
- val = E_AVR_MACH_AVRTINY;
- break;
- }
- elf_elfheader (abfd)->e_machine = EM_AVR;
- elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH;
- elf_elfheader (abfd)->e_flags |= val;
- return _bfd_elf_final_write_processing (abfd);
- }
- /* Set the right machine number. */
- static bool
- elf32_avr_object_p (bfd *abfd)
- {
- unsigned int e_set = bfd_mach_avr2;
- if (elf_elfheader (abfd)->e_machine == EM_AVR
- || elf_elfheader (abfd)->e_machine == EM_AVR_OLD)
- {
- 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_AVR25:
- e_set = bfd_mach_avr25;
- break;
- case E_AVR_MACH_AVR3:
- e_set = bfd_mach_avr3;
- break;
- case E_AVR_MACH_AVR31:
- e_set = bfd_mach_avr31;
- break;
- case E_AVR_MACH_AVR35:
- e_set = bfd_mach_avr35;
- break;
- case E_AVR_MACH_AVR4:
- e_set = bfd_mach_avr4;
- break;
- case E_AVR_MACH_AVR5:
- e_set = bfd_mach_avr5;
- break;
- case E_AVR_MACH_AVR51:
- e_set = bfd_mach_avr51;
- break;
- case E_AVR_MACH_AVR6:
- e_set = bfd_mach_avr6;
- break;
- case E_AVR_MACH_XMEGA1:
- e_set = bfd_mach_avrxmega1;
- break;
- case E_AVR_MACH_XMEGA2:
- e_set = bfd_mach_avrxmega2;
- break;
- case E_AVR_MACH_XMEGA3:
- e_set = bfd_mach_avrxmega3;
- break;
- case E_AVR_MACH_XMEGA4:
- e_set = bfd_mach_avrxmega4;
- break;
- case E_AVR_MACH_XMEGA5:
- e_set = bfd_mach_avrxmega5;
- break;
- case E_AVR_MACH_XMEGA6:
- e_set = bfd_mach_avrxmega6;
- break;
- case E_AVR_MACH_XMEGA7:
- e_set = bfd_mach_avrxmega7;
- break;
- case E_AVR_MACH_AVRTINY:
- e_set = bfd_mach_avrtiny;
- break;
- }
- }
- return bfd_default_set_arch_mach (abfd, bfd_arch_avr,
- e_set);
- }
- /* Returns whether the relocation type passed is a diff reloc. */
- static bool
- elf32_avr_is_diff_reloc (Elf_Internal_Rela *irel)
- {
- return (ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF8
- ||ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF16
- || ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF32);
- }
- /* Reduce the diff value written in the section by count if the shrinked
- insn address happens to fall between the two symbols for which this
- diff reloc was emitted. */
- static void
- elf32_avr_adjust_diff_reloc_value (bfd *abfd,
- struct bfd_section *isec,
- Elf_Internal_Rela *irel,
- bfd_vma symval,
- bfd_vma shrinked_insn_address,
- int count)
- {
- unsigned char *reloc_contents = NULL;
- unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents;
- if (isec_contents == NULL)
- {
- if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents))
- return;
- elf_section_data (isec)->this_hdr.contents = isec_contents;
- }
- reloc_contents = isec_contents + irel->r_offset;
- /* Read value written in object file. */
- bfd_signed_vma x = 0;
- switch (ELF32_R_TYPE (irel->r_info))
- {
- case R_AVR_DIFF8:
- {
- x = bfd_get_signed_8 (abfd, reloc_contents);
- break;
- }
- case R_AVR_DIFF16:
- {
- x = bfd_get_signed_16 (abfd, reloc_contents);
- break;
- }
- case R_AVR_DIFF32:
- {
- x = bfd_get_signed_32 (abfd, reloc_contents);
- break;
- }
- default:
- {
- BFD_FAIL();
- }
- }
- /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
- into the object file at the reloc offset. sym2's logical value is
- symval (<start_of_section>) + reloc addend. Compute the start and end
- addresses and check if the shrinked insn falls between sym1 and sym2. */
- bfd_vma sym2_address = symval + irel->r_addend;
- bfd_vma sym1_address = sym2_address - x;
- /* Don't assume sym2 is bigger than sym1 - the difference
- could be negative. Compute start and end addresses, and
- use those to see if they span shrinked_insn_address. */
- bfd_vma start_address = sym1_address < sym2_address
- ? sym1_address : sym2_address;
- bfd_vma end_address = sym1_address > sym2_address
- ? sym1_address : sym2_address;
- if (shrinked_insn_address >= start_address
- && shrinked_insn_address < end_address)
- {
- /* Reduce the diff value by count bytes and write it back into section
- contents. */
- bfd_signed_vma new_diff = x < 0 ? x + count : x - count;
- if (sym2_address > shrinked_insn_address)
- irel->r_addend -= count;
- switch (ELF32_R_TYPE (irel->r_info))
- {
- case R_AVR_DIFF8:
- {
- bfd_put_signed_8 (abfd, new_diff, reloc_contents);
- break;
- }
- case R_AVR_DIFF16:
- {
- bfd_put_signed_16 (abfd, new_diff & 0xFFFF, reloc_contents);
- break;
- }
- case R_AVR_DIFF32:
- {
- bfd_put_signed_32 (abfd, new_diff & 0xFFFFFFFF, reloc_contents);
- break;
- }
- default:
- {
- BFD_FAIL();
- }
- }
- }
- }
- static void
- elf32_avr_adjust_reloc_if_spans_insn (bfd *abfd,
- asection *isec,
- Elf_Internal_Rela *irel, bfd_vma symval,
- bfd_vma shrinked_insn_address,
- bfd_vma shrink_boundary,
- int count)
- {
- if (elf32_avr_is_diff_reloc (irel))
- {
- elf32_avr_adjust_diff_reloc_value (abfd, isec, irel,
- symval,
- shrinked_insn_address,
- count);
- }
- else
- {
- bfd_vma reloc_value = symval + irel->r_addend;
- bool addend_within_shrink_boundary = reloc_value <= shrink_boundary;
- bool reloc_spans_insn =
- (symval <= shrinked_insn_address
- && reloc_value > shrinked_insn_address
- && addend_within_shrink_boundary);
- if (! reloc_spans_insn)
- return;
- irel->r_addend -= count;
- if (debug_relax)
- printf ("Relocation's addend needed to be fixed \n");
- }
- }
- static bool
- avr_should_move_sym (symvalue symval,
- bfd_vma start,
- bfd_vma end,
- bool did_pad)
- {
- bool sym_within_boundary = did_pad ? symval < end : symval <= end;
- return (symval > start && sym_within_boundary);
- }
- static bool
- avr_should_reduce_sym_size (symvalue symval,
- symvalue symend,
- bfd_vma start,
- bfd_vma end,
- bool did_pad)
- {
- bool sym_end_within_boundary = did_pad ? symend < end : symend <= end;
- return (symval <= start && symend > start && sym_end_within_boundary);
- }
- static bool
- avr_should_increase_sym_size (symvalue symval,
- symvalue symend,
- bfd_vma start,
- bfd_vma end,
- bool did_pad)
- {
- return (avr_should_move_sym (symval, start, end, did_pad)
- && symend >= end && did_pad);
- }
- /* Delete some bytes from a section while changing the size of an instruction.
- The parameter "addr" denotes the section-relative offset pointing just
- behind the shrinked instruction. "addr+count" point at the first
- byte just behind the original unshrinked instruction. If delete_shrinks_insn
- is FALSE, we are deleting redundant padding bytes from relax_info prop
- record handling. In that case, addr is section-relative offset of start
- of padding, and count is the number of padding bytes to delete. */
- static bool
- elf32_avr_relax_delete_bytes (bfd *abfd,
- asection *sec,
- bfd_vma addr,
- int count,
- bool delete_shrinks_insn)
- {
- Elf_Internal_Shdr *symtab_hdr;
- unsigned int sec_shndx;
- bfd_byte *contents;
- Elf_Internal_Rela *irel, *irelend;
- Elf_Internal_Sym *isym;
- Elf_Internal_Sym *isymbuf = NULL;
- bfd_vma toaddr;
- struct elf_link_hash_entry **sym_hashes;
- struct elf_link_hash_entry **end_hashes;
- unsigned int symcount;
- struct avr_relax_info *relax_info;
- struct avr_property_record *prop_record = NULL;
- bool did_shrink = false;
- bool did_pad = false;
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
- contents = elf_section_data (sec)->this_hdr.contents;
- relax_info = get_avr_relax_info (sec);
- toaddr = sec->size;
- if (relax_info->records.count > 0)
- {
- /* There should be no property record within the range of deleted
- bytes, however, there might be a property record for ADDR, this is
- how we handle alignment directives.
- Find the next (if any) property record after the deleted bytes. */
- unsigned int i;
- for (i = 0; i < relax_info->records.count; ++i)
- {
- bfd_vma offset = relax_info->records.items [i].offset;
- BFD_ASSERT (offset <= addr || offset >= (addr + count));
- if (offset >= (addr + count))
- {
- prop_record = &relax_info->records.items [i];
- toaddr = offset;
- break;
- }
- }
- }
- irel = elf_section_data (sec)->relocs;
- irelend = irel + sec->reloc_count;
- /* Actually delete the bytes. */
- if (toaddr - addr - count > 0)
- {
- memmove (contents + addr, contents + addr + count,
- (size_t) (toaddr - addr - count));
- did_shrink = true;
- }
- if (prop_record == NULL)
- {
- sec->size -= count;
- did_shrink = true;
- }
- else
- {
- /* Use the property record to fill in the bytes we've opened up. */
- int fill = 0;
- switch (prop_record->type)
- {
- case RECORD_ORG_AND_FILL:
- fill = prop_record->data.org.fill;
- /* Fall through. */
- case RECORD_ORG:
- break;
- case RECORD_ALIGN_AND_FILL:
- fill = prop_record->data.align.fill;
- /* Fall through. */
- case RECORD_ALIGN:
- prop_record->data.align.preceding_deleted += count;
- break;
- };
- /* If toaddr == (addr + count), then we didn't delete anything, yet
- we fill count bytes backwards from toaddr. This is still ok - we
- end up overwriting the bytes we would have deleted. We just need
- to remember we didn't delete anything i.e. don't set did_shrink,
- so that we don't corrupt reloc offsets or symbol values.*/
- memset (contents + toaddr - count, fill, count);
- did_pad = true;
- }
- if (!did_shrink)
- return true;
- /* Adjust all the reloc addresses. */
- for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
- {
- bfd_vma old_reloc_address;
- old_reloc_address = (sec->output_section->vma
- + sec->output_offset + irel->r_offset);
- /* Get the new reloc address. */
- if ((irel->r_offset > addr
- && irel->r_offset < toaddr))
- {
- if (debug_relax)
- printf ("Relocation at address 0x%x needs to be moved.\n"
- "Old section offset: 0x%x, New section offset: 0x%x \n",
- (unsigned int) old_reloc_address,
- (unsigned int) irel->r_offset,
- (unsigned int) ((irel->r_offset) - count));
- irel->r_offset -= count;
- }
- }
- /* The reloc's own addresses are now ok. However, we need to readjust
- the reloc's addend, i.e. the reloc's value if two conditions are met:
- 1.) the reloc is relative to a symbol in this section that
- is located in front of the shrinked instruction
- 2.) symbol plus addend end up behind the shrinked instruction.
- The most common case where this happens are relocs relative to
- the section-start symbol.
- This step needs to be done for all of the sections of the bfd. */
- {
- struct bfd_section *isec;
- for (isec = abfd->sections; isec; isec = isec->next)
- {
- bfd_vma symval;
- bfd_vma shrinked_insn_address;
- if (isec->reloc_count == 0)
- continue;
- shrinked_insn_address = (sec->output_section->vma
- + sec->output_offset + addr);
- if (delete_shrinks_insn)
- shrinked_insn_address -= count;
- irel = elf_section_data (isec)->relocs;
- /* PR 12161: Read in the relocs for this section if necessary. */
- if (irel == NULL)
- irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, true);
- for (irelend = irel + isec->reloc_count;
- irel < irelend;
- irel++)
- {
- /* Read this BFD's local symbols if we haven't done
- so already. */
- if (isymbuf == NULL && symtab_hdr->sh_info != 0)
- {
- isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isymbuf == NULL)
- isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- if (isymbuf == NULL)
- return false;
- }
- /* Get the value of the symbol referred to by the reloc. */
- if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
- {
- /* A local symbol. */
- asection *sym_sec;
- isym = isymbuf + ELF32_R_SYM (irel->r_info);
- sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
- symval = isym->st_value;
- /* If the reloc is absolute, it will not have
- a symbol or section associated with it. */
- if (sym_sec == sec)
- {
- /* If there is an alignment boundary, we only need to
- adjust addends that end up below the boundary. */
- bfd_vma shrink_boundary = (toaddr
- + sec->output_section->vma
- + sec->output_offset);
- symval += sym_sec->output_section->vma
- + sym_sec->output_offset;
- if (debug_relax)
- printf ("Checking if the relocation's "
- "addend needs corrections.\n"
- "Address of anchor symbol: 0x%x \n"
- "Address of relocation target: 0x%x \n"
- "Address of relaxed insn: 0x%x \n",
- (unsigned int) symval,
- (unsigned int) (symval + irel->r_addend),
- (unsigned int) shrinked_insn_address);
- elf32_avr_adjust_reloc_if_spans_insn (abfd, isec, irel,
- symval,
- shrinked_insn_address,
- shrink_boundary,
- count);
- }
- /* else...Reference symbol is absolute. No adjustment needed. */
- }
- /* else...Reference symbol is extern. No need for adjusting
- the addend. */
- }
- }
- }
- /* Adjust the local symbols defined in this section. */
- isym = (Elf_Internal_Sym *) symtab_hdr->contents;
- /* Fix PR 9841, there may be no local symbols. */
- if (isym != NULL)
- {
- Elf_Internal_Sym *isymend;
- isymend = isym + symtab_hdr->sh_info;
- for (; isym < isymend; isym++)
- {
- if (isym->st_shndx == sec_shndx)
- {
- symvalue symval = isym->st_value;
- symvalue symend = symval + isym->st_size;
- if (avr_should_reduce_sym_size (symval, symend,
- addr, toaddr, did_pad))
- {
- /* If this assert fires then we have a symbol that ends
- part way through an instruction. Does that make
- sense? */
- BFD_ASSERT (isym->st_value + isym->st_size >= addr + count);
- isym->st_size -= count;
- }
- else if (avr_should_increase_sym_size (symval, symend,
- addr, toaddr, did_pad))
- isym->st_size += count;
- if (avr_should_move_sym (symval, addr, toaddr, did_pad))
- isym->st_value -= count;
- }
- }
- }
- /* Now adjust the global symbols defined in this section. */
- symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
- - symtab_hdr->sh_info);
- sym_hashes = elf_sym_hashes (abfd);
- end_hashes = sym_hashes + symcount;
- for (; sym_hashes < end_hashes; sym_hashes++)
- {
- struct elf_link_hash_entry *sym_hash = *sym_hashes;
- if ((sym_hash->root.type == bfd_link_hash_defined
- || sym_hash->root.type == bfd_link_hash_defweak)
- && sym_hash->root.u.def.section == sec)
- {
- symvalue symval = sym_hash->root.u.def.value;
- symvalue symend = symval + sym_hash->size;
- if (avr_should_reduce_sym_size (symval, symend,
- addr, toaddr, did_pad))
- {
- /* If this assert fires then we have a symbol that ends
- part way through an instruction. Does that make
- sense? */
- BFD_ASSERT (symend >= addr + count);
- sym_hash->size -= count;
- }
- else if (avr_should_increase_sym_size (symval, symend,
- addr, toaddr, did_pad))
- sym_hash->size += count;
- if (avr_should_move_sym (symval, addr, toaddr, did_pad))
- sym_hash->root.u.def.value -= count;
- }
- }
- return true;
- }
- static Elf_Internal_Sym *
- retrieve_local_syms (bfd *input_bfd)
- {
- Elf_Internal_Shdr *symtab_hdr;
- Elf_Internal_Sym *isymbuf;
- size_t locsymcount;
- symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
- locsymcount = symtab_hdr->sh_info;
- isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isymbuf == NULL && locsymcount != 0)
- isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
- NULL, NULL, NULL);
- /* Save the symbols for this input file so they won't be read again. */
- if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents)
- symtab_hdr->contents = (unsigned char *) isymbuf;
- return isymbuf;
- }
- /* Get the input section for a given symbol index.
- If the symbol is:
- . a section symbol, return the section;
- . a common symbol, return the common section;
- . an undefined symbol, return the undefined section;
- . an indirect symbol, follow the links;
- . an absolute value, return the absolute section. */
- static asection *
- get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx)
- {
- Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- asection *target_sec = NULL;
- if (r_symndx < symtab_hdr->sh_info)
- {
- Elf_Internal_Sym *isymbuf;
- unsigned int section_index;
- isymbuf = retrieve_local_syms (abfd);
- section_index = isymbuf[r_symndx].st_shndx;
- if (section_index == SHN_UNDEF)
- target_sec = bfd_und_section_ptr;
- else if (section_index == SHN_ABS)
- target_sec = bfd_abs_section_ptr;
- else if (section_index == SHN_COMMON)
- target_sec = bfd_com_section_ptr;
- else
- target_sec = bfd_section_from_elf_index (abfd, section_index);
- }
- else
- {
- unsigned long indx = r_symndx - symtab_hdr->sh_info;
- struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx];
- 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;
- switch (h->root.type)
- {
- case bfd_link_hash_defined:
- case bfd_link_hash_defweak:
- target_sec = h->root.u.def.section;
- break;
- case bfd_link_hash_common:
- target_sec = bfd_com_section_ptr;
- break;
- case bfd_link_hash_undefined:
- case bfd_link_hash_undefweak:
- target_sec = bfd_und_section_ptr;
- break;
- default: /* New indirect warning. */
- target_sec = bfd_und_section_ptr;
- break;
- }
- }
- return target_sec;
- }
- /* Get the section-relative offset for a symbol number. */
- static bfd_vma
- get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx)
- {
- Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- bfd_vma offset = 0;
- if (r_symndx < symtab_hdr->sh_info)
- {
- Elf_Internal_Sym *isymbuf;
- isymbuf = retrieve_local_syms (abfd);
- offset = isymbuf[r_symndx].st_value;
- }
- else
- {
- unsigned long indx = r_symndx - symtab_hdr->sh_info;
- struct elf_link_hash_entry *h =
- elf_sym_hashes (abfd)[indx];
- 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;
- if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- offset = h->root.u.def.value;
- }
- return offset;
- }
- /* Iterate over the property records in R_LIST, and copy each record into
- the list of records within the relaxation information for the section to
- which the record applies. */
- static void
- avr_elf32_assign_records_to_sections (struct avr_property_record_list *r_list)
- {
- unsigned int i;
- for (i = 0; i < r_list->record_count; ++i)
- {
- struct avr_relax_info *relax_info;
- relax_info = get_avr_relax_info (r_list->records [i].section);
- BFD_ASSERT (relax_info != NULL);
- if (relax_info->records.count
- == relax_info->records.allocated)
- {
- /* Allocate more space. */
- bfd_size_type size;
- relax_info->records.allocated += 10;
- size = (sizeof (struct avr_property_record)
- * relax_info->records.allocated);
- relax_info->records.items
- = bfd_realloc (relax_info->records.items, size);
- }
- memcpy (&relax_info->records.items [relax_info->records.count],
- &r_list->records [i],
- sizeof (struct avr_property_record));
- relax_info->records.count++;
- }
- }
- /* Compare two STRUCT AVR_PROPERTY_RECORD in AP and BP, used as the
- ordering callback from QSORT. */
- static int
- avr_property_record_compare (const void *ap, const void *bp)
- {
- const struct avr_property_record *a
- = (struct avr_property_record *) ap;
- const struct avr_property_record *b
- = (struct avr_property_record *) bp;
- if (a->offset != b->offset)
- return (a->offset - b->offset);
- if (a->section != b->section)
- return bfd_section_vma (a->section) - bfd_section_vma (b->section);
- return (a->type - b->type);
- }
- /* Load all of the avr property sections from all of the bfd objects
- referenced from LINK_INFO. All of the records within each property
- section are assigned to the STRUCT AVR_RELAX_INFO within the section
- specific data of the appropriate section. */
- static void
- avr_load_all_property_sections (struct bfd_link_info *link_info)
- {
- bfd *abfd;
- asection *sec;
- /* Initialize the per-section relaxation info. */
- for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
- for (sec = abfd->sections; sec != NULL; sec = sec->next)
- {
- init_avr_relax_info (sec);
- }
- /* Load the descriptor tables from .avr.prop sections. */
- for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
- {
- struct avr_property_record_list *r_list;
- r_list = avr_elf32_load_property_records (abfd);
- if (r_list != NULL)
- avr_elf32_assign_records_to_sections (r_list);
- free (r_list);
- }
- /* Now, for every section, ensure that the descriptor list in the
- relaxation data is sorted by ascending offset within the section. */
- for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
- for (sec = abfd->sections; sec != NULL; sec = sec->next)
- {
- struct avr_relax_info *relax_info = get_avr_relax_info (sec);
- if (relax_info && relax_info->records.count > 0)
- {
- unsigned int i;
- qsort (relax_info->records.items,
- relax_info->records.count,
- sizeof (struct avr_property_record),
- avr_property_record_compare);
- /* For debug purposes, list all the descriptors. */
- for (i = 0; i < relax_info->records.count; ++i)
- {
- switch (relax_info->records.items [i].type)
- {
- case RECORD_ORG:
- break;
- case RECORD_ORG_AND_FILL:
- break;
- case RECORD_ALIGN:
- break;
- case RECORD_ALIGN_AND_FILL:
- break;
- };
- }
- }
- }
- }
- /* This function handles relaxing for the avr.
- Many important relaxing opportunities within functions are already
- realized by the compiler itself.
- Here we try to replace call (4 bytes) -> rcall (2 bytes)
- and jump -> rjmp (safes also 2 bytes).
- As well we now optimize seqences of
- - call/rcall function
- - ret
- to yield
- - jmp/rjmp function
- - ret
- . In case that within a sequence
- - jmp/rjmp label
- - ret
- the ret could no longer be reached it is optimized away. In order
- to check if the ret is no longer needed, it is checked that the ret's address
- is not the target of a branch or jump within the same section, it is checked
- that there is no skip instruction before the jmp/rjmp and that there
- is no local or global label place at the address of the ret.
- We refrain from relaxing within sections ".vectors" and
- ".jumptables" in order to maintain the position of the instructions.
- There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop
- if possible. (In future one could possibly use the space of the nop
- for the first instruction of the irq service function.
- The .jumptables sections is meant to be used for a future tablejump variant
- for the devices with 3-byte program counter where the table itself
- contains 4-byte jump instructions whose relative offset must not
- be changed. */
- static bool
- elf32_avr_relax_section (bfd *abfd,
- asection *sec,
- struct bfd_link_info *link_info,
- bool *again)
- {
- Elf_Internal_Shdr *symtab_hdr;
- Elf_Internal_Rela *internal_relocs;
- Elf_Internal_Rela *irel, *irelend;
- bfd_byte *contents = NULL;
- Elf_Internal_Sym *isymbuf = NULL;
- struct elf32_avr_link_hash_table *htab;
- static bool relaxation_initialised = false;
- if (!relaxation_initialised)
- {
- relaxation_initialised = true;
- /* Load entries from the .avr.prop sections. */
- avr_load_all_property_sections (link_info);
- }
- /* If 'shrinkable' is FALSE, do not shrink by deleting bytes while
- relaxing. Such shrinking can cause issues for the sections such
- as .vectors and .jumptables. Instead the unused bytes should be
- filled with nop instructions. */
- bool shrinkable = true;
- if (!strcmp (sec->name,".vectors")
- || !strcmp (sec->name,".jumptables"))
- shrinkable = false;
- if (bfd_link_relocatable (link_info))
- (*link_info->callbacks->einfo)
- (_("%P%F: --relax and -r may not be used together\n"));
- htab = avr_link_hash_table (link_info);
- if (htab == NULL)
- return false;
- /* Assume nothing changes. */
- *again = false;
- if ((!htab->no_stubs) && (sec == htab->stub_sec))
- {
- /* We are just relaxing the stub section.
- Let's calculate the size needed again. */
- bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size;
- if (debug_relax)
- printf ("Relaxing the stub section. Size prior to this pass: %i\n",
- (int) last_estimated_stub_section_size);
- elf32_avr_size_stubs (htab->stub_sec->output_section->owner,
- link_info, false);
- /* Check if the number of trampolines changed. */
- if (last_estimated_stub_section_size != htab->stub_sec->size)
- *again = true;
- if (debug_relax)
- printf ("Size of stub section after this pass: %i\n",
- (int) htab->stub_sec->size);
- return true;
- }
- /* We don't have to do anything for a relocatable link, if
- this section does not have relocs, or if this is not a
- code section. */
- if (bfd_link_relocatable (link_info)
- || (sec->flags & SEC_RELOC) == 0
- || sec->reloc_count == 0
- || (sec->flags & SEC_CODE) == 0)
- return true;
- /* Check if the object file to relax uses internal symbols so that we
- could fix up the relocations. */
- if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED))
- return true;
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- /* Get a copy of the native relocations. */
- internal_relocs = (_bfd_elf_link_read_relocs
- (abfd, sec, NULL, NULL, link_info->keep_memory));
- if (internal_relocs == NULL)
- goto error_return;
- /* Walk through the relocs looking for relaxing opportunities. */
- irelend = internal_relocs + sec->reloc_count;
- for (irel = internal_relocs; irel < irelend; irel++)
- {
- bfd_vma symval;
- if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL
- && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL
- && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL)
- continue;
- /* Get the section contents if we haven't done so already. */
- if (contents == NULL)
- {
- /* Get cached copy if it exists. */
- if (elf_section_data (sec)->this_hdr.contents != NULL)
- contents = elf_section_data (sec)->this_hdr.contents;
- else
- {
- /* Go get them off disk. */
- if (! bfd_malloc_and_get_section (abfd, sec, &contents))
- goto error_return;
- }
- }
- /* Read this BFD's local symbols if we haven't done so already. */
- if (isymbuf == NULL && symtab_hdr->sh_info != 0)
- {
- isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isymbuf == NULL)
- isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- if (isymbuf == NULL)
- goto error_return;
- }
- /* Get the value of the symbol referred to by the reloc. */
- if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
- {
- /* A local symbol. */
- Elf_Internal_Sym *isym;
- asection *sym_sec;
- isym = isymbuf + ELF32_R_SYM (irel->r_info);
- sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
- symval = isym->st_value;
- /* If the reloc is absolute, it will not have
- a symbol or section associated with it. */
- if (sym_sec)
- symval += sym_sec->output_section->vma
- + sym_sec->output_offset;
- }
- else
- {
- unsigned long indx;
- struct elf_link_hash_entry *h;
- /* An external symbol. */
- indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
- h = elf_sym_hashes (abfd)[indx];
- BFD_ASSERT (h != NULL);
- if (h->root.type != bfd_link_hash_defined
- && h->root.type != bfd_link_hash_defweak)
- /* This appears to be a reference to an undefined
- symbol. Just ignore it--it will be caught by the
- regular reloc processing. */
- continue;
- symval = (h->root.u.def.value
- + h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset);
- }
- /* For simplicity of coding, we are going to modify the section
- contents, the section relocs, and the BFD symbol table. We
- must tell the rest of the code not to free up this
- information. It would be possible to instead create a table
- of changes which have to be made, as is done in coff-mips.c;
- that would be more work, but would require less memory when
- the linker is run. */
- switch (ELF32_R_TYPE (irel->r_info))
- {
- /* Try to turn a 22-bit absolute call/jump into an 13-bit
- pc-relative rcall/rjmp. */
- case R_AVR_CALL:
- {
- bfd_vma value = symval + irel->r_addend;
- bfd_vma dot, gap;
- int distance_short_enough = 0;
- /* Get the address of this instruction. */
- dot = (sec->output_section->vma
- + sec->output_offset + irel->r_offset);
- /* Compute the distance from this insn to the branch target. */
- gap = value - dot;
- /* The ISA manual states that addressable range is PC - 2k + 1 to
- PC + 2k. In bytes, that would be -4094 <= PC <= 4096. The range
- is shifted one word to the right, because pc-relative instructions
- implicitly add one word i.e. rjmp 0 jumps to next insn, not the
- current one.
- Therefore, for the !shrinkable case, the range is as above.
- If shrinkable, then the current code only deletes bytes 3 and
- 4 of the absolute call/jmp, so the forward jump range increases
- by 2 bytes, but the backward (negative) jump range remains
- the same. */
- /* Check if the gap falls in the range that can be accommodated
- in 13bits signed (It is 12bits when encoded, as we deal with
- word addressing). */
- if (!shrinkable && ((int) gap >= -4094 && (int) gap <= 4096))
- distance_short_enough = 1;
- /* If shrinkable, then we can check for a range of distance which
- is two bytes farther on the positive direction because the call
- or jump target will be closer by two bytes after the
- relaxation. */
- else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4098))
- distance_short_enough = 1;
- /* Here we handle the wrap-around case. E.g. for a 16k device
- we could use a rjmp to jump from address 0x100 to 0x3d00!
- In order to make this work properly, we need to fill the
- vaiable avr_pc_wrap_around with the appropriate value.
- I.e. 0x4000 for a 16k device. */
- {
- /* Shrinking the code size makes the gaps larger in the
- case of wrap-arounds. So we use a heuristical safety
- margin to avoid that during relax the distance gets
- again too large for the short jumps. Let's assume
- a typical code-size reduction due to relax for a
- 16k device of 600 bytes. So let's use twice the
- typical value as safety margin. */
- int rgap;
- int safety_margin;
- int assumed_shrink = 600;
- if (avr_pc_wrap_around > 0x4000)
- assumed_shrink = 900;
- safety_margin = 2 * assumed_shrink;
- rgap = avr_relative_distance_considering_wrap_around (gap);
- if (rgap >= (-4092 + safety_margin)
- && rgap <= (4094 - safety_margin))
- distance_short_enough = 1;
- }
- if (distance_short_enough)
- {
- unsigned char code_msb;
- unsigned char code_lsb;
- if (debug_relax)
- printf ("shrinking jump/call instruction at address 0x%x"
- " in section %s\n\n",
- (int) dot, sec->name);
- /* Note that we've changed the relocs, section contents,
- etc. */
- elf_section_data (sec)->relocs = internal_relocs;
- elf_section_data (sec)->this_hdr.contents = contents;
- symtab_hdr->contents = (unsigned char *) isymbuf;
- /* Get the instruction code for relaxing. */
- code_lsb = bfd_get_8 (abfd, contents + irel->r_offset);
- code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
- /* Mask out the relocation bits. */
- code_msb &= 0x94;
- code_lsb &= 0x0E;
- if (code_msb == 0x94 && code_lsb == 0x0E)
- {
- /* we are changing call -> rcall . */
- bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
- bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1);
- }
- else if (code_msb == 0x94 && code_lsb == 0x0C)
- {
- /* we are changeing jump -> rjmp. */
- bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
- bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1);
- }
- else
- abort ();
- /* Fix the relocation's type. */
- irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
- R_AVR_13_PCREL);
- /* We should not modify the ordering if 'shrinkable' is
- FALSE. */
- if (!shrinkable)
- {
- /* Let's insert a nop. */
- bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2);
- bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3);
- }
- else
- {
- /* Delete two bytes of data. */
- if (!elf32_avr_relax_delete_bytes (abfd, sec,
- irel->r_offset + 2, 2,
- true))
- goto error_return;
- /* That will change things, so, we should relax again.
- Note that this is not required, and it may be slow. */
- *again = true;
- }
- }
- }
- /* Fall through. */
- default:
- {
- unsigned char code_msb;
- unsigned char code_lsb;
- bfd_vma dot;
- code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
- code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0);
- /* Get the address of this instruction. */
- dot = (sec->output_section->vma
- + sec->output_offset + irel->r_offset);
- /* Here we look for rcall/ret or call/ret sequences that could be
- safely replaced by rjmp/ret or jmp/ret. */
- if (((code_msb & 0xf0) == 0xd0)
- && avr_replace_call_ret_sequences)
- {
- /* This insn is a rcall. */
- unsigned char next_insn_msb = 0;
- unsigned char next_insn_lsb = 0;
- if (irel->r_offset + 3 < sec->size)
- {
- next_insn_msb =
- bfd_get_8 (abfd, contents + irel->r_offset + 3);
- next_insn_lsb =
- bfd_get_8 (abfd, contents + irel->r_offset + 2);
- }
- if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
- {
- /* The next insn is a ret. We now convert the rcall insn
- into a rjmp instruction. */
- code_msb &= 0xef;
- bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1);
- if (debug_relax)
- printf ("converted rcall/ret sequence at address 0x%x"
- " into rjmp/ret sequence. Section is %s\n\n",
- (int) dot, sec->name);
- *again = true;
- break;
- }
- }
- else if ((0x94 == (code_msb & 0xfe))
- && (0x0e == (code_lsb & 0x0e))
- && avr_replace_call_ret_sequences)
- {
- /* This insn is a call. */
- unsigned char next_insn_msb = 0;
- unsigned char next_insn_lsb = 0;
- if (irel->r_offset + 5 < sec->size)
- {
- next_insn_msb =
- bfd_get_8 (abfd, contents + irel->r_offset + 5);
- next_insn_lsb =
- bfd_get_8 (abfd, contents + irel->r_offset + 4);
- }
- if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
- {
- /* The next insn is a ret. We now convert the call insn
- into a jmp instruction. */
- code_lsb &= 0xfd;
- bfd_put_8 (abfd, code_lsb, contents + irel->r_offset);
- if (debug_relax)
- printf ("converted call/ret sequence at address 0x%x"
- " into jmp/ret sequence. Section is %s\n\n",
- (int) dot, sec->name);
- *again = true;
- break;
- }
- }
- else if ((0xc0 == (code_msb & 0xf0))
- || ((0x94 == (code_msb & 0xfe))
- && (0x0c == (code_lsb & 0x0e))))
- {
- /* This insn is a rjmp or a jmp. */
- unsigned char next_insn_msb = 0;
- unsigned char next_insn_lsb = 0;
- int insn_size;
- if (0xc0 == (code_msb & 0xf0))
- insn_size = 2; /* rjmp insn */
- else
- insn_size = 4; /* jmp insn */
- if (irel->r_offset + insn_size + 1 < sec->size)
- {
- next_insn_msb =
- bfd_get_8 (abfd, contents + irel->r_offset
- + insn_size + 1);
- next_insn_lsb =
- bfd_get_8 (abfd, contents + irel->r_offset
- + insn_size);
- }
- if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
- {
- /* The next insn is a ret. We possibly could delete
- this ret. First we need to check for preceding
- sbis/sbic/sbrs or cpse "skip" instructions. */
- int there_is_preceding_non_skip_insn = 1;
- bfd_vma address_of_ret;
- address_of_ret = dot + insn_size;
- if (debug_relax && (insn_size == 2))
- printf ("found rjmp / ret sequence at address 0x%x\n",
- (int) dot);
- if (debug_relax && (insn_size == 4))
- printf ("found jmp / ret sequence at address 0x%x\n",
- (int) dot);
- /* We have to make sure that there is a preceding insn. */
- if (irel->r_offset >= 2)
- {
- unsigned char preceding_msb;
- unsigned char preceding_lsb;
- preceding_msb =
- bfd_get_8 (abfd, contents + irel->r_offset - 1);
- preceding_lsb =
- bfd_get_8 (abfd, contents + irel->r_offset - 2);
- /* sbic. */
- if (0x99 == preceding_msb)
- there_is_preceding_non_skip_insn = 0;
- /* sbis. */
- if (0x9b == preceding_msb)
- there_is_preceding_non_skip_insn = 0;
- /* sbrc */
- if ((0xfc == (preceding_msb & 0xfe)
- && (0x00 == (preceding_lsb & 0x08))))
- there_is_preceding_non_skip_insn = 0;
- /* sbrs */
- if ((0xfe == (preceding_msb & 0xfe)
- && (0x00 == (preceding_lsb & 0x08))))
- there_is_preceding_non_skip_insn = 0;
- /* cpse */
- if (0x10 == (preceding_msb & 0xfc))
- there_is_preceding_non_skip_insn = 0;
- if (there_is_preceding_non_skip_insn == 0)
- if (debug_relax)
- printf ("preceding skip insn prevents deletion of"
- " ret insn at Addy 0x%x in section %s\n",
- (int) dot + 2, sec->name);
- }
- else
- {
- /* There is no previous instruction. */
- there_is_preceding_non_skip_insn = 0;
- }
- if (there_is_preceding_non_skip_insn)
- {
- /* We now only have to make sure that there is no
- local label defined at the address of the ret
- instruction and that there is no local relocation
- in this section pointing to the ret. */
- int deleting_ret_is_safe = 1;
- unsigned int section_offset_of_ret_insn =
- irel->r_offset + insn_size;
- Elf_Internal_Sym *isym, *isymend;
- unsigned int sec_shndx;
- struct bfd_section *isec;
- sec_shndx =
- _bfd_elf_section_from_bfd_section (abfd, sec);
- /* Check for local symbols. */
- isym = (Elf_Internal_Sym *) symtab_hdr->contents;
- isymend = isym + symtab_hdr->sh_info;
- /* PR 6019: There may not be any local symbols. */
- for (; isym != NULL && isym < isymend; isym++)
- {
- if (isym->st_value == section_offset_of_ret_insn
- && isym->st_shndx == sec_shndx)
- {
- deleting_ret_is_safe = 0;
- if (debug_relax)
- printf ("local label prevents deletion of ret "
- "insn at address 0x%x\n",
- (int) dot + insn_size);
- }
- }
- /* Now check for global symbols. */
- {
- int symcount;
- struct elf_link_hash_entry **sym_hashes;
- struct elf_link_hash_entry **end_hashes;
- symcount = (symtab_hdr->sh_size
- / sizeof (Elf32_External_Sym)
- - symtab_hdr->sh_info);
- sym_hashes = elf_sym_hashes (abfd);
- end_hashes = sym_hashes + symcount;
- for (; sym_hashes < end_hashes; sym_hashes++)
- {
- struct elf_link_hash_entry *sym_hash =
- *sym_hashes;
- if ((sym_hash->root.type == bfd_link_hash_defined
- || sym_hash->root.type ==
- bfd_link_hash_defweak)
- && sym_hash->root.u.def.section == sec
- && sym_hash->root.u.def.value == section_offset_of_ret_insn)
- {
- deleting_ret_is_safe = 0;
- if (debug_relax)
- printf ("global label prevents deletion of "
- "ret insn at address 0x%x\n",
- (int) dot + insn_size);
- }
- }
- }
- /* Now we check for relocations pointing to ret. */
- for (isec = abfd->sections; isec && deleting_ret_is_safe; isec = isec->next)
- {
- Elf_Internal_Rela *rel;
- Elf_Internal_Rela *relend;
- rel = elf_section_data (isec)->relocs;
- if (rel == NULL)
- rel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, true);
- relend = rel + isec->reloc_count;
- for (; rel && rel < relend; rel++)
- {
- bfd_vma reloc_target = 0;
- /* Read this BFD's local symbols if we haven't
- done so already. */
- if (isymbuf == NULL && symtab_hdr->sh_info != 0)
- {
- isymbuf = (Elf_Internal_Sym *)
- symtab_hdr->contents;
- if (isymbuf == NULL)
- isymbuf = bfd_elf_get_elf_syms
- (abfd,
- symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- if (isymbuf == NULL)
- break;
- }
- /* Get the value of the symbol referred to
- by the reloc. */
- if (ELF32_R_SYM (rel->r_info)
- < symtab_hdr->sh_info)
- {
- /* A local symbol. */
- asection *sym_sec;
- isym = isymbuf
- + ELF32_R_SYM (rel->r_info);
- sym_sec = bfd_section_from_elf_index
- (abfd, isym->st_shndx);
- symval = isym->st_value;
- /* If the reloc is absolute, it will not
- have a symbol or section associated
- with it. */
- if (sym_sec)
- {
- symval +=
- sym_sec->output_section->vma
- + sym_sec->output_offset;
- reloc_target = symval + rel->r_addend;
- }
- else
- {
- reloc_target = symval + rel->r_addend;
- /* Reference symbol is absolute. */
- }
- }
- /* else ... reference symbol is extern. */
- if (address_of_ret == reloc_target)
- {
- deleting_ret_is_safe = 0;
- if (debug_relax)
- printf ("ret from "
- "rjmp/jmp ret sequence at address"
- " 0x%x could not be deleted. ret"
- " is target of a relocation.\n",
- (int) address_of_ret);
- break;
- }
- }
- }
- if (deleting_ret_is_safe)
- {
- if (debug_relax)
- printf ("unreachable ret instruction "
- "at address 0x%x deleted.\n",
- (int) dot + insn_size);
- /* Delete two bytes of data. */
- if (!elf32_avr_relax_delete_bytes (abfd, sec,
- irel->r_offset + insn_size, 2,
- true))
- goto error_return;
- /* That will change things, so, we should relax
- again. Note that this is not required, and it
- may be slow. */
- *again = true;
- break;
- }
- }
- }
- }
- break;
- }
- }
- }
- if (!*again)
- {
- /* Look through all the property records in this section to see if
- there's any alignment records that can be moved. */
- struct avr_relax_info *relax_info;
- relax_info = get_avr_relax_info (sec);
- if (relax_info->records.count > 0)
- {
- unsigned int i;
- for (i = 0; i < relax_info->records.count; ++i)
- {
- switch (relax_info->records.items [i].type)
- {
- case RECORD_ORG:
- case RECORD_ORG_AND_FILL:
- break;
- case RECORD_ALIGN:
- case RECORD_ALIGN_AND_FILL:
- {
- struct avr_property_record *record;
- unsigned long bytes_to_align;
- int count = 0;
- /* Look for alignment directives that have had enough
- bytes deleted before them, such that the directive
- can be moved backwards and still maintain the
- required alignment. */
- record = &relax_info->records.items [i];
- bytes_to_align
- = (unsigned long) (1 << record->data.align.bytes);
- while (record->data.align.preceding_deleted >=
- bytes_to_align)
- {
- record->data.align.preceding_deleted
- -= bytes_to_align;
- count += bytes_to_align;
- }
- if (count > 0)
- {
- bfd_vma addr = record->offset;
- /* We can delete COUNT bytes and this alignment
- directive will still be correctly aligned.
- First move the alignment directive, then delete
- the bytes. */
- record->offset -= count;
- elf32_avr_relax_delete_bytes (abfd, sec,
- addr - count,
- count, false);
- *again = true;
- }
- }
- break;
- }
- }
- }
- }
- if (contents != NULL
- && elf_section_data (sec)->this_hdr.contents != contents)
- {
- if (! link_info->keep_memory)
- free (contents);
- else
- {
- /* Cache the section contents for elf_link_input_bfd. */
- elf_section_data (sec)->this_hdr.contents = contents;
- }
- }
- if (elf_section_data (sec)->relocs != internal_relocs)
- free (internal_relocs);
- return true;
- error_return:
- if (symtab_hdr->contents != (unsigned char *) isymbuf)
- free (isymbuf);
- if (elf_section_data (sec)->this_hdr.contents != contents)
- free (contents);
- if (elf_section_data (sec)->relocs != internal_relocs)
- free (internal_relocs);
- return false;
- }
- /* This is a version of bfd_generic_get_relocated_section_contents
- which uses elf32_avr_relocate_section.
- For avr it's essentially a cut and paste taken from the H8300 port.
- The author of the relaxation support patch for avr had absolutely no
- clue what is happening here but found out that this part of the code
- seems to be important. */
- static bfd_byte *
- elf32_avr_get_relocated_section_contents (bfd *output_bfd,
- struct bfd_link_info *link_info,
- struct bfd_link_order *link_order,
- bfd_byte *data,
- bool relocatable,
- asymbol **symbols)
- {
- Elf_Internal_Shdr *symtab_hdr;
- asection *input_section = link_order->u.indirect.section;
- bfd *input_bfd = input_section->owner;
- asection **sections = NULL;
- Elf_Internal_Rela *internal_relocs = NULL;
- Elf_Internal_Sym *isymbuf = NULL;
- /* We only need to handle the case of relaxing, or of having a
- particular set of section contents, specially. */
- if (relocatable
- || elf_section_data (input_section)->this_hdr.contents == NULL)
- return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
- link_order, data,
- relocatable,
- symbols);
- symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
- memcpy (data, elf_section_data (input_section)->this_hdr.contents,
- (size_t) input_section->size);
- if ((input_section->flags & SEC_RELOC) != 0
- && input_section->reloc_count > 0)
- {
- asection **secpp;
- Elf_Internal_Sym *isym, *isymend;
- bfd_size_type amt;
- internal_relocs = (_bfd_elf_link_read_relocs
- (input_bfd, input_section, NULL, NULL, false));
- if (internal_relocs == NULL)
- goto error_return;
- if (symtab_hdr->sh_info != 0)
- {
- isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isymbuf == NULL)
- isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- if (isymbuf == NULL)
- goto error_return;
- }
- amt = symtab_hdr->sh_info;
- amt *= sizeof (asection *);
- sections = bfd_malloc (amt);
- if (sections == NULL && amt != 0)
- goto error_return;
- isymend = isymbuf + symtab_hdr->sh_info;
- for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
- {
- asection *isec;
- if (isym->st_shndx == SHN_UNDEF)
- isec = bfd_und_section_ptr;
- else if (isym->st_shndx == SHN_ABS)
- isec = bfd_abs_section_ptr;
- else if (isym->st_shndx == SHN_COMMON)
- isec = bfd_com_section_ptr;
- else
- isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
- *secpp = isec;
- }
- if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd,
- input_section, data, internal_relocs,
- isymbuf, sections))
- goto error_return;
- free (sections);
- if (symtab_hdr->contents != (unsigned char *) isymbuf)
- free (isymbuf);
- if (elf_section_data (input_section)->relocs != internal_relocs)
- free (internal_relocs);
- }
- return data;
- error_return:
- free (sections);
- if (symtab_hdr->contents != (unsigned char *) isymbuf)
- free (isymbuf);
- if (elf_section_data (input_section)->relocs != internal_relocs)
- free (internal_relocs);
- return NULL;
- }
- /* Determines the hash entry name for a particular reloc. It consists of
- the identifier of the symbol section and the added reloc addend and
- symbol offset relative to the section the symbol is attached to. */
- static char *
- avr_stub_name (const asection *symbol_section,
- const bfd_vma symbol_offset,
- const Elf_Internal_Rela *rela)
- {
- char *stub_name;
- bfd_size_type len;
- len = 8 + 1 + 8 + 1 + 1;
- stub_name = bfd_malloc (len);
- if (stub_name != NULL)
- sprintf (stub_name, "%08x+%08x",
- symbol_section->id & 0xffffffff,
- (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset));
- return stub_name;
- }
- /* Add a new stub entry to the stub hash. Not all fields of the new
- stub entry are initialised. */
- static struct elf32_avr_stub_hash_entry *
- avr_add_stub (const char *stub_name,
- struct elf32_avr_link_hash_table *htab)
- {
- struct elf32_avr_stub_hash_entry *hsh;
- /* Enter this entry into the linker stub hash table. */
- hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, true, false);
- if (hsh == NULL)
- {
- /* xgettext:c-format */
- _bfd_error_handler (_("cannot create stub entry %s"), stub_name);
- return NULL;
- }
- hsh->stub_offset = 0;
- return hsh;
- }
- /* We assume that there is already space allocated for the stub section
- contents and that before building the stubs the section size is
- initialized to 0. We assume that within the stub hash table entry,
- the absolute position of the jmp target has been written in the
- target_value field. We write here the offset of the generated jmp insn
- relative to the trampoline section start to the stub_offset entry in
- the stub hash table entry. */
- static bool
- avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg)
- {
- struct elf32_avr_stub_hash_entry *hsh;
- struct bfd_link_info *info;
- struct elf32_avr_link_hash_table *htab;
- bfd *stub_bfd;
- bfd_byte *loc;
- bfd_vma target;
- bfd_vma starget;
- /* Basic opcode */
- bfd_vma jmp_insn = 0x0000940c;
- /* Massage our args to the form they really have. */
- hsh = avr_stub_hash_entry (bh);
- if (!hsh->is_actually_needed)
- return true;
- info = (struct bfd_link_info *) in_arg;
- htab = avr_link_hash_table (info);
- if (htab == NULL)
- return false;
- target = hsh->target_value;
- /* Make a note of the offset within the stubs for this entry. */
- hsh->stub_offset = htab->stub_sec->size;
- loc = htab->stub_sec->contents + hsh->stub_offset;
- stub_bfd = htab->stub_sec->owner;
- if (debug_stubs)
- printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n",
- (unsigned int) target,
- (unsigned int) hsh->stub_offset);
- /* We now have to add the information on the jump target to the bare
- opcode bits already set in jmp_insn. */
- /* Check for the alignment of the address. */
- if (target & 1)
- return false;
- starget = target >> 1;
- jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16;
- bfd_put_16 (stub_bfd, jmp_insn, loc);
- bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2);
- htab->stub_sec->size += 4;
- /* Now add the entries in the address mapping table if there is still
- space left. */
- {
- unsigned int nr;
- nr = htab->amt_entry_cnt + 1;
- if (nr <= htab->amt_max_entry_cnt)
- {
- htab->amt_entry_cnt = nr;
- htab->amt_stub_offsets[nr - 1] = hsh->stub_offset;
- htab->amt_destination_addr[nr - 1] = target;
- }
- }
- return true;
- }
- static bool
- avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh,
- void *in_arg ATTRIBUTE_UNUSED)
- {
- struct elf32_avr_stub_hash_entry *hsh;
- hsh = avr_stub_hash_entry (bh);
- hsh->is_actually_needed = false;
- return true;
- }
- static bool
- avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg)
- {
- struct elf32_avr_stub_hash_entry *hsh;
- struct elf32_avr_link_hash_table *htab;
- int size;
- /* Massage our args to the form they really have. */
- hsh = avr_stub_hash_entry (bh);
- htab = in_arg;
- if (hsh->is_actually_needed)
- size = 4;
- else
- size = 0;
- htab->stub_sec->size += size;
- return true;
- }
- void
- elf32_avr_setup_params (struct bfd_link_info *info,
- bfd *avr_stub_bfd,
- asection *avr_stub_section,
- bool no_stubs,
- bool deb_stubs,
- bool deb_relax,
- bfd_vma pc_wrap_around,
- bool call_ret_replacement)
- {
- struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
- if (htab == NULL)
- return;
- htab->stub_sec = avr_stub_section;
- htab->stub_bfd = avr_stub_bfd;
- htab->no_stubs = no_stubs;
- debug_relax = deb_relax;
- debug_stubs = deb_stubs;
- avr_pc_wrap_around = pc_wrap_around;
- avr_replace_call_ret_sequences = call_ret_replacement;
- }
- /* Set up various things so that we can make a list of input sections
- for each output section included in the link. Returns -1 on error,
- 0 when no stubs will be needed, and 1 on success. It also sets
- information on the stubs bfd and the stub section in the info
- struct. */
- int
- elf32_avr_setup_section_lists (bfd *output_bfd,
- struct bfd_link_info *info)
- {
- bfd *input_bfd;
- unsigned int bfd_count;
- unsigned int top_id, top_index;
- asection *section;
- asection **input_list, **list;
- size_t amt;
- struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
- if (htab == NULL || htab->no_stubs)
- return 0;
- /* Count the number of input BFDs and find the top input section id. */
- for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
- input_bfd != NULL;
- input_bfd = input_bfd->link.next)
- {
- bfd_count += 1;
- for (section = input_bfd->sections;
- section != NULL;
- section = section->next)
- if (top_id < section->id)
- top_id = section->id;
- }
- htab->bfd_count = bfd_count;
- /* We can't use output_bfd->section_count here to find the top output
- section index as some sections may have been removed, and
- strip_excluded_output_sections doesn't renumber the indices. */
- for (section = output_bfd->sections, top_index = 0;
- section != NULL;
- section = section->next)
- if (top_index < section->index)
- top_index = section->index;
- htab->top_index = top_index;
- amt = sizeof (asection *) * (top_index + 1);
- input_list = bfd_malloc (amt);
- htab->input_list = input_list;
- if (input_list == NULL)
- return -1;
- /* For sections we aren't interested in, mark their entries with a
- value we can check later. */
- list = input_list + top_index;
- do
- *list = bfd_abs_section_ptr;
- while (list-- != input_list);
- for (section = output_bfd->sections;
- section != NULL;
- section = section->next)
- if ((section->flags & SEC_CODE) != 0)
- input_list[section->index] = NULL;
- return 1;
- }
- /* Read in all local syms for all input bfds, and create hash entries
- for export stubs if we are building a multi-subspace shared lib.
- Returns -1 on error, 0 otherwise. */
- static int
- get_local_syms (bfd *input_bfd, struct bfd_link_info *info)
- {
- unsigned int bfd_indx;
- Elf_Internal_Sym *local_syms, **all_local_syms;
- struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);
- size_t amt;
- if (htab == NULL)
- return -1;
- /* We want to read in symbol extension records only once. To do this
- we need to read in the local symbols in parallel and save them for
- later use; so hold pointers to the local symbols in an array. */
- amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
- all_local_syms = bfd_zmalloc (amt);
- htab->all_local_syms = all_local_syms;
- if (all_local_syms == NULL)
- return -1;
- /* Walk over all the input BFDs, swapping in local symbols.
- If we are creating a shared library, create hash entries for the
- export stubs. */
- for (bfd_indx = 0;
- input_bfd != NULL;
- input_bfd = input_bfd->link.next, bfd_indx++)
- {
- Elf_Internal_Shdr *symtab_hdr;
- /* We'll need the symbol table in a second. */
- symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
- if (symtab_hdr->sh_info == 0)
- continue;
- /* We need an array of the local symbols attached to the input bfd. */
- local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (local_syms == NULL)
- {
- local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- /* Cache them for elf_link_input_bfd. */
- symtab_hdr->contents = (unsigned char *) local_syms;
- }
- if (local_syms == NULL)
- return -1;
- all_local_syms[bfd_indx] = local_syms;
- }
- return 0;
- }
- #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0
- bool
- elf32_avr_size_stubs (bfd *output_bfd,
- struct bfd_link_info *info,
- bool is_prealloc_run)
- {
- struct elf32_avr_link_hash_table *htab;
- int stub_changed = 0;
- htab = avr_link_hash_table (info);
- if (htab == NULL)
- return false;
- /* At this point we initialize htab->vector_base
- To the start of the text output section. */
- htab->vector_base = htab->stub_sec->output_section->vma;
- if (get_local_syms (info->input_bfds, info))
- {
- if (htab->all_local_syms)
- goto error_ret_free_local;
- return false;
- }
- if (ADD_DUMMY_STUBS_FOR_DEBUGGING)
- {
- struct elf32_avr_stub_hash_entry *test;
- test = avr_add_stub ("Hugo",htab);
- test->target_value = 0x123456;
- test->stub_offset = 13;
- test = avr_add_stub ("Hugo2",htab);
- test->target_value = 0x84210;
- test->stub_offset = 14;
- }
- while (1)
- {
- bfd *input_bfd;
- unsigned int bfd_indx;
- /* We will have to re-generate the stub hash table each time anything
- in memory has changed. */
- bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab);
- for (input_bfd = info->input_bfds, bfd_indx = 0;
- input_bfd != NULL;
- input_bfd = input_bfd->link.next, bfd_indx++)
- {
- Elf_Internal_Shdr *symtab_hdr;
- asection *section;
- Elf_Internal_Sym *local_syms;
- /* We'll need the symbol table in a second. */
- symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
- if (symtab_hdr->sh_info == 0)
- continue;
- local_syms = htab->all_local_syms[bfd_indx];
- /* Walk over each section attached to the input bfd. */
- for (section = input_bfd->sections;
- section != NULL;
- section = section->next)
- {
- Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
- /* If there aren't any relocs, then there's nothing more
- to do. */
- if ((section->flags & SEC_RELOC) == 0
- || section->reloc_count == 0)
- continue;
- /* If this section is a link-once section that will be
- discarded, then don't create any stubs. */
- if (section->output_section == NULL
- || section->output_section->owner != output_bfd)
- continue;
- /* Get the relocs. */
- internal_relocs
- = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
- info->keep_memory);
- if (internal_relocs == NULL)
- goto error_ret_free_local;
- /* Now examine each relocation. */
- irela = internal_relocs;
- irelaend = irela + section->reloc_count;
- for (; irela < irelaend; irela++)
- {
- unsigned int r_type, r_indx;
- struct elf32_avr_stub_hash_entry *hsh;
- asection *sym_sec;
- bfd_vma sym_value;
- bfd_vma destination;
- struct elf_link_hash_entry *hh;
- char *stub_name;
- r_type = ELF32_R_TYPE (irela->r_info);
- r_indx = ELF32_R_SYM (irela->r_info);
- /* Only look for 16 bit GS relocs. No other reloc will need a
- stub. */
- if (!((r_type == R_AVR_16_PM)
- || (r_type == R_AVR_LO8_LDI_GS)
- || (r_type == R_AVR_HI8_LDI_GS)))
- continue;
- /* Now determine the call target, its name, value,
- section. */
- sym_sec = NULL;
- sym_value = 0;
- destination = 0;
- hh = NULL;
- if (r_indx < symtab_hdr->sh_info)
- {
- /* It's a local symbol. */
- Elf_Internal_Sym *sym;
- Elf_Internal_Shdr *hdr;
- unsigned int shndx;
- sym = local_syms + r_indx;
- if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
- sym_value = sym->st_value;
- shndx = sym->st_shndx;
- if (shndx < elf_numsections (input_bfd))
- {
- hdr = elf_elfsections (input_bfd)[shndx];
- sym_sec = hdr->bfd_section;
- destination = (sym_value + irela->r_addend
- + sym_sec->output_offset
- + sym_sec->output_section->vma);
- }
- }
- else
- {
- /* It's an external symbol. */
- int e_indx;
- e_indx = r_indx - symtab_hdr->sh_info;
- hh = elf_sym_hashes (input_bfd)[e_indx];
- while (hh->root.type == bfd_link_hash_indirect
- || hh->root.type == bfd_link_hash_warning)
- hh = (struct elf_link_hash_entry *)
- (hh->root.u.i.link);
- if (hh->root.type == bfd_link_hash_defined
- || hh->root.type == bfd_link_hash_defweak)
- {
- sym_sec = hh->root.u.def.section;
- sym_value = hh->root.u.def.value;
- if (sym_sec->output_section != NULL)
- destination = (sym_value + irela->r_addend
- + sym_sec->output_offset
- + sym_sec->output_section->vma);
- }
- else if (hh->root.type == bfd_link_hash_undefweak)
- {
- if (! bfd_link_pic (info))
- continue;
- }
- else if (hh->root.type == bfd_link_hash_undefined)
- {
- if (! (info->unresolved_syms_in_objects == RM_IGNORE
- && (ELF_ST_VISIBILITY (hh->other)
- == STV_DEFAULT)))
- continue;
- }
- else
- {
- bfd_set_error (bfd_error_bad_value);
- error_ret_free_internal:
- if (elf_section_data (section)->relocs == NULL)
- free (internal_relocs);
- goto error_ret_free_local;
- }
- }
- if (! avr_stub_is_required_for_16_bit_reloc
- (destination - htab->vector_base))
- {
- if (!is_prealloc_run)
- /* We are having a reloc that does't need a stub. */
- continue;
- /* We don't right now know if a stub will be needed.
- Let's rather be on the safe side. */
- }
- /* Get the name of this stub. */
- stub_name = avr_stub_name (sym_sec, sym_value, irela);
- if (!stub_name)
- goto error_ret_free_internal;
- hsh = avr_stub_hash_lookup (&htab->bstab,
- stub_name,
- false, false);
- if (hsh != NULL)
- {
- /* The proper stub has already been created. Mark it
- to be used and write the possibly changed destination
- value. */
- hsh->is_actually_needed = true;
- hsh->target_value = destination;
- free (stub_name);
- continue;
- }
- hsh = avr_add_stub (stub_name, htab);
- if (hsh == NULL)
- {
- free (stub_name);
- goto error_ret_free_internal;
- }
- hsh->is_actually_needed = true;
- hsh->target_value = destination;
- if (debug_stubs)
- printf ("Adding stub with destination 0x%x to the"
- " hash table.\n", (unsigned int) destination);
- if (debug_stubs)
- printf ("(Pre-Alloc run: %i)\n", is_prealloc_run);
- stub_changed = true;
- }
- /* We're done with the internal relocs, free them. */
- if (elf_section_data (section)->relocs == NULL)
- free (internal_relocs);
- }
- }
- /* Re-Calculate the number of needed stubs. */
- htab->stub_sec->size = 0;
- bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab);
- if (!stub_changed)
- break;
- stub_changed = false;
- }
- free (htab->all_local_syms);
- return true;
- error_ret_free_local:
- free (htab->all_local_syms);
- return false;
- }
- /* Build all the stubs associated with the current output file. The
- stubs are kept in a hash table attached to the main linker hash
- table. We also set up the .plt entries for statically linked PIC
- functions here. This function is called via hppaelf_finish in the
- linker. */
- bool
- elf32_avr_build_stubs (struct bfd_link_info *info)
- {
- asection *stub_sec;
- struct bfd_hash_table *table;
- struct elf32_avr_link_hash_table *htab;
- bfd_size_type total_size = 0;
- htab = avr_link_hash_table (info);
- if (htab == NULL)
- return false;
- /* In case that there were several stub sections: */
- for (stub_sec = htab->stub_bfd->sections;
- stub_sec != NULL;
- stub_sec = stub_sec->next)
- {
- bfd_size_type size;
- /* Allocate memory to hold the linker stubs. */
- size = stub_sec->size;
- total_size += size;
- stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
- if (stub_sec->contents == NULL && size != 0)
- return false;
- stub_sec->size = 0;
- }
- /* Allocate memory for the adress mapping table. */
- htab->amt_entry_cnt = 0;
- htab->amt_max_entry_cnt = total_size / 4;
- htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma)
- * htab->amt_max_entry_cnt);
- htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma)
- * htab->amt_max_entry_cnt );
- if (debug_stubs)
- printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt);
- /* Build the stubs as directed by the stub hash table. */
- table = &htab->bstab;
- bfd_hash_traverse (table, avr_build_one_stub, info);
- if (debug_stubs)
- printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size);
- return true;
- }
- /* Callback used by QSORT to order relocations AP and BP. */
- static int
- internal_reloc_compare (const void *ap, const void *bp)
- {
- const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap;
- const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp;
- if (a->r_offset != b->r_offset)
- return (a->r_offset - b->r_offset);
- /* We don't need to sort on these criteria for correctness,
- but enforcing a more strict ordering prevents unstable qsort
- from behaving differently with different implementations.
- Without the code below we get correct but different results
- on Solaris 2.7 and 2.8. We would like to always produce the
- same results no matter the host. */
- if (a->r_info != b->r_info)
- return (a->r_info - b->r_info);
- return (a->r_addend - b->r_addend);
- }
- /* Return true if ADDRESS is within the vma range of SECTION from ABFD. */
- static bool
- avr_is_section_for_address (asection *section, bfd_vma address)
- {
- bfd_vma vma;
- bfd_size_type size;
- vma = bfd_section_vma (section);
- if (address < vma)
- return false;
- size = section->size;
- if (address >= vma + size)
- return false;
- return true;
- }
- /* Data structure used by AVR_FIND_SECTION_FOR_ADDRESS. */
- struct avr_find_section_data
- {
- /* The address we're looking for. */
- bfd_vma address;
- /* The section we've found. */
- asection *section;
- };
- /* Helper function to locate the section holding a certain virtual memory
- address. This is called via bfd_map_over_sections. The DATA is an
- instance of STRUCT AVR_FIND_SECTION_DATA, the address field of which
- has been set to the address to search for, and the section field has
- been set to NULL. If SECTION from ABFD contains ADDRESS then the
- section field in DATA will be set to SECTION. As an optimisation, if
- the section field is already non-null then this function does not
- perform any checks, and just returns. */
- static void
- avr_find_section_for_address (bfd *abfd ATTRIBUTE_UNUSED,
- asection *section, void *data)
- {
- struct avr_find_section_data *fs_data
- = (struct avr_find_section_data *) data;
- /* Return if already found. */
- if (fs_data->section != NULL)
- return;
- /* If this section isn't part of the addressable code content, skip it. */
- if ((bfd_section_flags (section) & SEC_ALLOC) == 0
- && (bfd_section_flags (section) & SEC_CODE) == 0)
- return;
- if (avr_is_section_for_address (section, fs_data->address))
- fs_data->section = section;
- }
- /* Load all of the property records from SEC, a section from ABFD. Return
- a STRUCT AVR_PROPERTY_RECORD_LIST containing all the records. The
- memory for the returned structure, and all of the records pointed too by
- the structure are allocated with a single call to malloc, so, only the
- pointer returned needs to be free'd. */
- static struct avr_property_record_list *
- avr_elf32_load_records_from_section (bfd *abfd, asection *sec)
- {
- bfd_byte *contents, *ptr;
- bfd_size_type size, mem_size;
- bfd_byte version, flags;
- uint16_t record_count, i;
- struct avr_property_record_list *r_list = NULL;
- Elf_Internal_Rela *internal_relocs = NULL, *rel, *rel_end;
- struct avr_find_section_data fs_data;
- fs_data.section = NULL;
- if (!bfd_malloc_and_get_section (abfd, sec, &contents))
- goto load_failed;
- ptr = contents;
- /* Load the relocations for the '.avr.prop' section if there are any, and
- sort them. */
- internal_relocs = (_bfd_elf_link_read_relocs
- (abfd, sec, NULL, NULL, false));
- if (internal_relocs)
- qsort (internal_relocs, sec->reloc_count,
- sizeof (Elf_Internal_Rela), internal_reloc_compare);
- /* There is a header at the start of the property record section SEC, the
- format of this header is:
- uint8_t : version number
- uint8_t : flags
- uint16_t : record counter
- */
- /* Check we have at least got a headers worth of bytes. */
- size = bfd_section_size (sec);
- if (size < AVR_PROPERTY_SECTION_HEADER_SIZE)
- goto load_failed;
- version = *ptr;
- ptr++;
- flags = *ptr;
- ptr++;
- record_count = bfd_get_16 (abfd, ptr);
- ptr += 2;
- BFD_ASSERT (ptr - contents == AVR_PROPERTY_SECTION_HEADER_SIZE);
- /* Now allocate space for the list structure, and all of the list
- elements in a single block. */
- mem_size = sizeof (struct avr_property_record_list)
- + sizeof (struct avr_property_record) * record_count;
- r_list = bfd_malloc (mem_size);
- if (r_list == NULL)
- goto load_failed;
- r_list->version = version;
- r_list->flags = flags;
- r_list->section = sec;
- r_list->record_count = record_count;
- r_list->records = (struct avr_property_record *) (&r_list [1]);
- size -= AVR_PROPERTY_SECTION_HEADER_SIZE;
- /* Check that we understand the version number. There is only one
- version number right now, anything else is an error. */
- if (r_list->version != AVR_PROPERTY_RECORDS_VERSION)
- goto load_failed;
- rel = internal_relocs;
- rel_end = rel + sec->reloc_count;
- for (i = 0; i < record_count; ++i)
- {
- bfd_vma address;
- /* Each entry is a 32-bit address, followed by a single byte type.
- After that is the type specific data. We must take care to
- ensure that we don't read beyond the end of the section data. */
- if (size < 5)
- goto load_failed;
- r_list->records [i].section = NULL;
- r_list->records [i].offset = 0;
- if (rel)
- {
- /* The offset of the address within the .avr.prop section. */
- size_t offset = ptr - contents;
- while (rel < rel_end && rel->r_offset < offset)
- ++rel;
- if (rel == rel_end)
- rel = NULL;
- else if (rel->r_offset == offset)
- {
- /* Find section and section offset. */
- unsigned long r_symndx;
- asection * rel_sec;
- bfd_vma sec_offset;
- r_symndx = ELF32_R_SYM (rel->r_info);
- rel_sec = get_elf_r_symndx_section (abfd, r_symndx);
- sec_offset = get_elf_r_symndx_offset (abfd, r_symndx)
- + rel->r_addend;
- r_list->records [i].section = rel_sec;
- r_list->records [i].offset = sec_offset;
- }
- }
- address = bfd_get_32 (abfd, ptr);
- ptr += 4;
- size -= 4;
- if (r_list->records [i].section == NULL)
- {
- /* Try to find section and offset from address. */
- if (fs_data.section != NULL
- && !avr_is_section_for_address (fs_data.section, address))
- fs_data.section = NULL;
- if (fs_data.section == NULL)
- {
- fs_data.address = address;
- bfd_map_over_sections (abfd, avr_find_section_for_address,
- &fs_data);
- }
- if (fs_data.section == NULL)
- {
- fprintf (stderr, "Failed to find matching section.\n");
- goto load_failed;
- }
- r_list->records [i].section = fs_data.section;
- r_list->records [i].offset
- = address - bfd_section_vma (fs_data.section);
- }
- r_list->records [i].type = *ptr;
- ptr += 1;
- size -= 1;
- switch (r_list->records [i].type)
- {
- case RECORD_ORG:
- /* Nothing else to load. */
- break;
- case RECORD_ORG_AND_FILL:
- /* Just a 4-byte fill to load. */
- if (size < 4)
- goto load_failed;
- r_list->records [i].data.org.fill = bfd_get_32 (abfd, ptr);
- ptr += 4;
- size -= 4;
- break;
- case RECORD_ALIGN:
- /* Just a 4-byte alignment to load. */
- if (size < 4)
- goto load_failed;
- r_list->records [i].data.align.bytes = bfd_get_32 (abfd, ptr);
- ptr += 4;
- size -= 4;
- /* Just initialise PRECEDING_DELETED field, this field is
- used during linker relaxation. */
- r_list->records [i].data.align.preceding_deleted = 0;
- break;
- case RECORD_ALIGN_AND_FILL:
- /* A 4-byte alignment, and a 4-byte fill to load. */
- if (size < 8)
- goto load_failed;
- r_list->records [i].data.align.bytes = bfd_get_32 (abfd, ptr);
- ptr += 4;
- r_list->records [i].data.align.fill = bfd_get_32 (abfd, ptr);
- ptr += 4;
- size -= 8;
- /* Just initialise PRECEDING_DELETED field, this field is
- used during linker relaxation. */
- r_list->records [i].data.align.preceding_deleted = 0;
- break;
- default:
- goto load_failed;
- }
- }
- free (contents);
- if (elf_section_data (sec)->relocs != internal_relocs)
- free (internal_relocs);
- return r_list;
- load_failed:
- if (elf_section_data (sec)->relocs != internal_relocs)
- free (internal_relocs);
- free (contents);
- free (r_list);
- return NULL;
- }
- /* Load all of the property records from ABFD. See
- AVR_ELF32_LOAD_RECORDS_FROM_SECTION for details of the return value. */
- struct avr_property_record_list *
- avr_elf32_load_property_records (bfd *abfd)
- {
- asection *sec;
- /* Find the '.avr.prop' section and load the contents into memory. */
- sec = bfd_get_section_by_name (abfd, AVR_PROPERTY_RECORD_SECTION_NAME);
- if (sec == NULL)
- return NULL;
- return avr_elf32_load_records_from_section (abfd, sec);
- }
- const char *
- avr_elf32_property_record_name (struct avr_property_record *rec)
- {
- const char *str;
- switch (rec->type)
- {
- case RECORD_ORG:
- str = "ORG";
- break;
- case RECORD_ORG_AND_FILL:
- str = "ORG+FILL";
- break;
- case RECORD_ALIGN:
- str = "ALIGN";
- break;
- case RECORD_ALIGN_AND_FILL:
- str = "ALIGN+FILL";
- break;
- default:
- str = "unknown";
- }
- return str;
- }
- #define ELF_ARCH bfd_arch_avr
- #define ELF_TARGET_ID AVR_ELF_DATA
- #define ELF_MACHINE_CODE EM_AVR
- #define ELF_MACHINE_ALT1 EM_AVR_OLD
- #define ELF_MAXPAGESIZE 1
- #define TARGET_LITTLE_SYM avr_elf32_vec
- #define TARGET_LITTLE_NAME "elf32-avr"
- #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create
- #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_can_gc_sections 1
- #define elf_backend_rela_normal 1
- #define elf_backend_final_write_processing \
- bfd_elf_avr_final_write_processing
- #define elf_backend_object_p elf32_avr_object_p
- #define bfd_elf32_bfd_relax_section elf32_avr_relax_section
- #define bfd_elf32_bfd_get_relocated_section_contents \
- elf32_avr_get_relocated_section_contents
- #define bfd_elf32_new_section_hook elf_avr_new_section_hook
- #define elf_backend_special_sections elf_avr_special_sections
- #include "elf32-target.h"
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