diff options
Diffstat (limited to 'binutils-2.25/bfd/elf32-avr.c')
| -rw-r--r-- | binutils-2.25/bfd/elf32-avr.c | 3087 |
1 files changed, 3087 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/elf32-avr.c b/binutils-2.25/bfd/elf32-avr.c new file mode 100644 index 00000000..43100cd2 --- /dev/null +++ b/binutils-2.25/bfd/elf32-avr.c @@ -0,0 +1,3087 @@ +/* AVR-specific support for 32-bit ELF + Copyright 1999-2013 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 bfd_boolean debug_relax = FALSE; + +/* Enable debugging printout at stdout with this variable. */ +static bfd_boolean debug_stubs = FALSE; + +/* 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. */ + bfd_boolean 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; + + bfd_boolean 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; + 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) \ + /* PR 3874: Check that we have an AVR style hash table before using it. */\ + (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ + == 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 */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_AVR_NONE", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_AVR_32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_AVR_32", /* name */ + FALSE, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* A 7 bit PC relative relocation. */ + HOWTO (R_AVR_7_PCREL, /* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 7, /* bitsize */ + TRUE, /* pc_relative */ + 3, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_AVR_7_PCREL", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* A 13 bit PC relative relocation. */ + HOWTO (R_AVR_13_PCREL, /* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 13, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_AVR_13_PCREL", /* name */ + FALSE, /* partial_inplace */ + 0xfff, /* src_mask */ + 0xfff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* A 16 bit absolute relocation. */ + HOWTO (R_AVR_16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_AVR_16", /* name */ + FALSE, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* A 16 bit absolute relocation for command address + 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 */ +}; + +/* 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 } +}; + +/* 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; + +/* 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); +} + +/* 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; + bfd_size_type 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))) + return NULL; + + return &htab->etab.root; +} + +/* Free the derived linker hash table. */ + +static void +elf32_avr_link_hash_table_free (struct bfd_link_hash_table *btab) +{ + struct elf32_avr_link_hash_table *htab + = (struct elf32_avr_link_hash_table *) btab; + + /* Free the address mapping table. */ + if (htab->amt_stub_offsets != NULL) + free (htab->amt_stub_offsets); + if (htab->amt_destination_addr != NULL) + free (htab->amt_destination_addr); + + bfd_hash_table_free (&htab->bstab); + _bfd_elf_link_hash_table_free (btab); +} + +/* 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 void +avr_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, + arelent *cache_ptr, + Elf_Internal_Rela *dst) +{ + unsigned int r_type; + + r_type = ELF32_R_TYPE (dst->r_info); + BFD_ASSERT (r_type < (unsigned int) R_AVR_max); + cache_ptr->howto = &elf_avr_howto_table[r_type]; +} + +static bfd_boolean +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 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; + bfd_boolean 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) << 3) & 0x3f8); + bfd_put_16 (input_bfd, x, contents); + break; + + case R_AVR_13_PCREL: + contents += rel->r_offset; + srel = (bfd_signed_vma) relocation; + srel += rel->r_addend; + srel -= rel->r_offset; + srel -= 2; /* Branch instructions add 2 to the PC... */ + srel -= (input_section->output_section->vma + + input_section->output_offset); + + if (srel & 1) + return bfd_reloc_outofrange; + + 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; + + 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 bfd_boolean +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 (input_bfd, sec) : name; + } + else + { + bfd_boolean unresolved_reloc, warned; + + RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, + r_symndx, symtab_hdr, sym_hashes, + h, sec, relocation, + unresolved_reloc, warned); + + 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 (info->relocatable) + 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: + r = 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: + r = info->callbacks->undefined_symbol + (info, name, input_bfd, input_section, rel->r_offset, TRUE); + break; + + case bfd_reloc_outofrange: + msg = _("internal error: out of range error"); + break; + + case bfd_reloc_notsupported: + msg = _("internal error: unsupported relocation error"); + break; + + case bfd_reloc_dangerous: + msg = _("internal error: dangerous relocation"); + break; + + default: + msg = _("internal error: unknown error"); + break; + } + + if (msg) + r = info->callbacks->warning + (info, msg, name, input_bfd, input_section, rel->r_offset); + + if (! r) + return FALSE; + } + } + + return TRUE; +} + +/* The final processing done just before writing out a AVR ELF object + file. This gets the AVR architecture right based on the machine + number. */ + +static void +bfd_elf_avr_final_write_processing (bfd *abfd, + bfd_boolean linker ATTRIBUTE_UNUSED) +{ + unsigned long val; + + switch (bfd_get_mach (abfd)) + { + default: + case bfd_mach_avr2: + val = E_AVR_MACH_AVR2; + break; + + case bfd_mach_avr1: + val = E_AVR_MACH_AVR1; + break; + + case bfd_mach_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; + } + + elf_elfheader (abfd)->e_machine = EM_AVR; + elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH; + elf_elfheader (abfd)->e_flags |= val; + elf_elfheader (abfd)->e_flags |= EF_AVR_LINKRELAX_PREPARED; +} + +/* Set the right machine number. */ + +static bfd_boolean +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; + } + } + return bfd_default_set_arch_mach (abfd, bfd_arch_avr, + e_set); +} + + +/* 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. */ + +static bfd_boolean +elf32_avr_relax_delete_bytes (bfd *abfd, + asection *sec, + bfd_vma addr, + int count) +{ + 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; + + 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; + + toaddr = sec->size; + + 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)); + sec->size -= count; + + /* 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 - 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) + { + 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); + + if (symval <= shrinked_insn_address + && (symval + irel->r_addend) > shrinked_insn_address) + { + irel->r_addend -= count; + + if (debug_relax) + printf ("Relocation's addend needed to be fixed \n"); + } + } + /* 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 + && isym->st_value > addr + && isym->st_value < toaddr) + 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 + && sym_hash->root.u.def.value > addr + && sym_hash->root.u.def.value < toaddr) + { + sym_hash->root.u.def.value -= count; + } + } + + return TRUE; +} + +/* 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 bfd_boolean +elf32_avr_relax_section (bfd *abfd, + asection *sec, + struct bfd_link_info *link_info, + bfd_boolean *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; + + /* 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. */ + bfd_boolean shrinkable = TRUE; + + if (!strcmp (sec->name,".vectors") + || !strcmp (sec->name,".jumptables")) + shrinkable = FALSE; + + if (link_info->relocatable) + (*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 (link_info->relocatable + || (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; + + /* 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 >= -4096 && (int) gap <= 4095)) + distance_short_enough = 1; + /* If shrinkable, then we can check for a range of distance which + is two bytes farther on both the directions because the call + or jump target will be closer by two bytes after the + relaxation. */ + else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4097)) + 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)) + 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; + } + } + } + + 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)) + 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 (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 (internal_relocs != NULL + && elf_section_data (sec)->relocs != internal_relocs) + free (internal_relocs); + + return TRUE; + + error_return: + if (isymbuf != NULL + && symtab_hdr->contents != (unsigned char *) isymbuf) + free (isymbuf); + if (contents != NULL + && elf_section_data (sec)->this_hdr.contents != contents) + free (contents); + if (internal_relocs != NULL + && 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, + bfd_boolean 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; + + if (sections != NULL) + free (sections); + if (isymbuf != NULL + && symtab_hdr->contents != (unsigned char *) isymbuf) + free (isymbuf); + if (elf_section_data (input_section)->relocs != internal_relocs) + free (internal_relocs); + } + + return data; + + error_return: + if (sections != NULL) + free (sections); + if (isymbuf != NULL + && symtab_hdr->contents != (unsigned char *) isymbuf) + free (isymbuf); + if (internal_relocs != NULL + && 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); + + 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) + { + (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), + NULL, 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 bfd_boolean +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 bfd_boolean +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 bfd_boolean +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, + bfd_boolean no_stubs, + bfd_boolean deb_stubs, + bfd_boolean deb_relax, + bfd_vma pc_wrap_around, + bfd_boolean 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; + int top_id, top_index; + asection *section; + asection **input_list, **list; + bfd_size_type 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); + bfd_size_type 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 + +bfd_boolean +elf32_avr_size_stubs (bfd *output_bfd, + struct bfd_link_info *info, + bfd_boolean 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 (! info->shared) + 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. */ + +bfd_boolean +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; +} + +#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 bfd_elf32_avr_vec +#define TARGET_LITTLE_NAME "elf32-avr" + +#define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create +#define bfd_elf32_bfd_link_hash_table_free elf32_avr_link_hash_table_free + +#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 + +#include "elf32-target.h" |