1
/* BFD back-end for ARM COFF files.
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Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4
Free Software Foundation, Inc.
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Written by Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "coff/internal.h"
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/* Macros for manipulation the bits in the flags field of the coff data
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#define APCS_26_FLAG(abfd) \
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(coff_data (abfd)->flags & F_APCS_26)
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#define APCS_FLOAT_FLAG(abfd) \
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(coff_data (abfd)->flags & F_APCS_FLOAT)
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#define PIC_FLAG(abfd) \
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(coff_data (abfd)->flags & F_PIC)
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#define APCS_SET(abfd) \
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(coff_data (abfd)->flags & F_APCS_SET)
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#define SET_APCS_FLAGS(abfd, flgs) \
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coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
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coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
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#define INTERWORK_FLAG(abfd) \
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(coff_data (abfd)->flags & F_INTERWORK)
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#define INTERWORK_SET(abfd) \
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(coff_data (abfd)->flags & F_INTERWORK_SET)
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#define SET_INTERWORK_FLAG(abfd, flg) \
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coff_data (abfd)->flags &= ~F_INTERWORK; \
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coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
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#define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
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typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
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/* some typedefs for holding instructions */
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typedef unsigned long int insn32;
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typedef unsigned short int insn16;
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/* Forward declarations for stupid compilers. */
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static boolean coff_arm_relocate_section
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PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
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struct internal_reloc *, struct internal_syment *, asection **));
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static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type aoutarm_fix_pcrel_26
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type coff_thumb_pcrel_23
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type coff_thumb_pcrel_9
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static insn32 insert_thumb_branch
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PARAMS ((insn32, int));
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static bfd_reloc_status_type coff_thumb_pcrel_12
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type coff_arm_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static boolean coff_arm_adjust_symndx
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PARAMS ((bfd *, struct bfd_link_info *, bfd *,
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asection *, struct internal_reloc *, boolean *));
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static reloc_howto_type * coff_arm_rtype_to_howto
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PARAMS ((bfd *, asection *, struct internal_reloc *,
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struct coff_link_hash_entry *, struct internal_syment *,
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static bfd_reloc_status_type coff_thumb_pcrel_common
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
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thumb_pcrel_branchtype));
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static const struct reloc_howto_struct * coff_arm_reloc_type_lookup
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PARAMS ((bfd *, bfd_reloc_code_real_type));
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static struct bfd_link_hash_table * coff_arm_link_hash_table_create
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static struct coff_link_hash_entry * find_thumb_glue
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PARAMS ((struct bfd_link_info *, const char *, bfd *));
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static struct coff_link_hash_entry * find_arm_glue
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PARAMS ((struct bfd_link_info *, const char *, bfd *));
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#ifndef COFF_IMAGE_WITH_PE
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static void record_arm_to_thumb_glue
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PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
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static void record_thumb_to_arm_glue
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PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
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static boolean coff_arm_merge_private_bfd_data
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PARAMS ((bfd *, bfd *));
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static boolean coff_arm_print_private_bfd_data
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PARAMS ((bfd *, PTR));
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static boolean _bfd_coff_arm_set_private_flags
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PARAMS ((bfd *, flagword));
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static boolean coff_arm_copy_private_bfd_data
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PARAMS ((bfd *, bfd *));
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static boolean coff_arm_is_local_label_name
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PARAMS ((bfd *, const char *));
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static boolean coff_arm_link_output_has_begun
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PARAMS ((bfd *, struct coff_final_link_info *));
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static boolean coff_arm_final_link_postscript
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PARAMS ((bfd *, struct coff_final_link_info *));
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static void arm_emit_base_file_entry
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PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma));
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/* The linker script knows the section names for placement.
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The entry_names are used to do simple name mangling on the stubs.
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Given a function name, and its type, the stub can be found. The
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name can be changed. The only requirement is the %s be present. */
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#define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
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#define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
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#define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
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#define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
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/* Used by the assembler. */
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static bfd_reloc_status_type
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coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
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arelent *reloc_entry;
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asymbol *symbol ATTRIBUTE_UNUSED;
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asection *input_section ATTRIBUTE_UNUSED;
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char **error_message ATTRIBUTE_UNUSED;
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if (output_bfd == (bfd *) NULL)
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return bfd_reloc_continue;
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diff = reloc_entry->addend;
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x = ((x & ~howto->dst_mask) \
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| (((x & howto->src_mask) + diff) & howto->dst_mask))
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reloc_howto_type *howto = reloc_entry->howto;
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unsigned char *addr = (unsigned char *) data + reloc_entry->address;
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char x = bfd_get_8 (abfd, addr);
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bfd_put_8 (abfd, x, addr);
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short x = bfd_get_16 (abfd, addr);
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bfd_put_16 (abfd, (bfd_vma) x, addr);
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long x = bfd_get_32 (abfd, addr);
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bfd_put_32 (abfd, (bfd_vma) x, addr);
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/* Now let bfd_perform_relocation finish everything up. */
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return bfd_reloc_continue;
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/* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
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in this file), then TARGET_UNDERSCORE should be defined, otherwise it
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#ifndef TARGET_UNDERSCORE
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#define TARGET_UNDERSCORE '_'
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#define PCRELOFFSET true
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/* These most certainly belong somewhere else. Just had to get rid of
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the manifest constants in the code. */
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#define ARM_THUMB9 12
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#define ARM_THUMB12 13
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#define ARM_THUMB23 14
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#define ARM_THUMB12 4
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#define ARM_SECTION 14
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#define ARM_SECREL 15
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static reloc_howto_type aoutarm_std_reloc_howto[] =
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complain_overflow_bitfield,
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complain_overflow_bitfield,
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complain_overflow_signed,
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aoutarm_fix_pcrel_26 ,
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complain_overflow_signed,
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coff_thumb_pcrel_12 ,
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complain_overflow_dont,
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aoutarm_fix_pcrel_26_done,
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complain_overflow_bitfield,
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complain_overflow_bitfield,
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#else /* not ARM_WINCE */
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HOWTO (ARM_8, /* type */
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false, /* pc_relative */
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complain_overflow_bitfield, /* complain_on_overflow */
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coff_arm_reloc, /* special_function */
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true, /* partial_inplace */
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0x000000ff, /* src_mask */
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0x000000ff, /* dst_mask */
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PCRELOFFSET /* pcrel_offset */),
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complain_overflow_bitfield,
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complain_overflow_bitfield,
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complain_overflow_signed,
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aoutarm_fix_pcrel_26 ,
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complain_overflow_signed,
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complain_overflow_signed,
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complain_overflow_signed,
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complain_overflow_dont,
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aoutarm_fix_pcrel_26_done,
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complain_overflow_bitfield,
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complain_overflow_bitfield,
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complain_overflow_bitfield,
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complain_overflow_signed,
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complain_overflow_signed,
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coff_thumb_pcrel_12 ,
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complain_overflow_signed,
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coff_thumb_pcrel_23 ,
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#endif /* not ARM_WINCE */
555
#define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
558
static boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
559
/* Return true if this relocation should
560
appear in the output .reloc section. */
563
in_reloc_p (abfd, howto)
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bfd * abfd ATTRIBUTE_UNUSED;
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reloc_howto_type * howto;
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return !howto->pc_relative && howto->type != ARM_RVA32;
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#define RTYPE2HOWTO(cache_ptr, dst) \
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(cache_ptr)->howto = \
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(dst)->r_type < NUM_RELOCS \
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? aoutarm_std_reloc_howto + (dst)->r_type \
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#define coff_rtype_to_howto coff_arm_rtype_to_howto
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static reloc_howto_type *
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coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
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bfd *abfd ATTRIBUTE_UNUSED;
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struct internal_reloc *rel;
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struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
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struct internal_syment *sym ATTRIBUTE_UNUSED;
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reloc_howto_type * howto;
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if (rel->r_type >= NUM_RELOCS)
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howto = aoutarm_std_reloc_howto + rel->r_type;
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if (rel->r_type == ARM_RVA32)
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*addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
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/* Used by the assembler. */
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static bfd_reloc_status_type
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aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
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output_bfd, error_message)
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bfd *abfd ATTRIBUTE_UNUSED;
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arelent *reloc_entry ATTRIBUTE_UNUSED;
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asymbol *symbol ATTRIBUTE_UNUSED;
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PTR data ATTRIBUTE_UNUSED;
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asection *input_section ATTRIBUTE_UNUSED;
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bfd *output_bfd ATTRIBUTE_UNUSED;
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char **error_message ATTRIBUTE_UNUSED;
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/* This is dead simple at present. */
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/* Used by the assembler. */
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static bfd_reloc_status_type
621
aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
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output_bfd, error_message)
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arelent *reloc_entry;
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asection *input_section;
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char **error_message ATTRIBUTE_UNUSED;
632
bfd_size_type addr = reloc_entry->address;
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long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
634
bfd_reloc_status_type flag = bfd_reloc_ok;
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/* If this is an undefined symbol, return error. */
637
if (symbol->section == &bfd_und_section
638
&& (symbol->flags & BSF_WEAK) == 0)
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return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
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/* If the sections are different, and we are doing a partial relocation,
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just ignore it for now. */
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if (symbol->section->name != input_section->name
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&& output_bfd != (bfd *)NULL)
645
return bfd_reloc_continue;
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relocation = (target & 0x00ffffff) << 2;
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relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
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relocation += symbol->value;
650
relocation += symbol->section->output_section->vma;
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relocation += symbol->section->output_offset;
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relocation += reloc_entry->addend;
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relocation -= input_section->output_section->vma;
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relocation -= input_section->output_offset;
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return bfd_reloc_overflow;
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/* Check for overflow. */
661
if (relocation & 0x02000000)
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if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
664
flag = bfd_reloc_overflow;
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else if (relocation & ~(bfd_vma) 0x03ffffff)
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flag = bfd_reloc_overflow;
669
target &= ~0x00ffffff;
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target |= (relocation >> 2) & 0x00ffffff;
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bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
673
/* Now the ARM magic... Change the reloc type so that it is marked as done.
674
Strictly this is only necessary if we are doing a partial relocation. */
675
reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
680
static bfd_reloc_status_type
681
coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
682
output_bfd, error_message, btype)
684
arelent *reloc_entry;
687
asection *input_section;
689
char **error_message ATTRIBUTE_UNUSED;
690
thumb_pcrel_branchtype btype;
692
bfd_vma relocation = 0;
693
bfd_size_type addr = reloc_entry->address;
694
long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
695
bfd_reloc_status_type flag = bfd_reloc_ok;
700
/* NOTE: This routine is currently used by GAS, but not by the link
708
signbit = 0x00000100;
714
signbit = 0x00000800;
720
signbit = 0x00400000;
727
/* If this is an undefined symbol, return error. */
728
if (symbol->section == &bfd_und_section
729
&& (symbol->flags & BSF_WEAK) == 0)
730
return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
732
/* If the sections are different, and we are doing a partial relocation,
733
just ignore it for now. */
734
if (symbol->section->name != input_section->name
735
&& output_bfd != (bfd *)NULL)
736
return bfd_reloc_continue;
742
relocation = ((target & dstmsk) << 1);
746
if (bfd_big_endian (abfd))
747
relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
749
relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
756
relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
757
relocation += symbol->value;
758
relocation += symbol->section->output_section->vma;
759
relocation += symbol->section->output_offset;
760
relocation += reloc_entry->addend;
761
relocation -= input_section->output_section->vma;
762
relocation -= input_section->output_offset;
766
return bfd_reloc_overflow;
768
/* Check for overflow. */
769
if (relocation & signbit)
771
if ((relocation & ~offmsk) != ~offmsk)
772
flag = bfd_reloc_overflow;
774
else if (relocation & ~offmsk)
775
flag = bfd_reloc_overflow;
782
target |= (relocation >> 1);
786
if (bfd_big_endian (abfd))
787
target |= (((relocation & 0xfff) >> 1)
788
| ((relocation << 4) & 0x07ff0000));
790
target |= (((relocation & 0xffe) << 15)
791
| ((relocation >> 12) & 0x7ff));
798
bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
800
/* Now the ARM magic... Change the reloc type so that it is marked as done.
801
Strictly this is only necessary if we are doing a partial relocation. */
802
reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
804
/* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
809
static bfd_reloc_status_type
810
coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
811
output_bfd, error_message)
813
arelent *reloc_entry;
816
asection *input_section;
818
char **error_message;
820
return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
821
input_section, output_bfd, error_message,
825
static bfd_reloc_status_type
826
coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
827
output_bfd, error_message)
829
arelent *reloc_entry;
832
asection *input_section;
834
char **error_message;
836
return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
837
input_section, output_bfd, error_message,
840
#endif /* not ARM_WINCE */
842
static bfd_reloc_status_type
843
coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
844
output_bfd, error_message)
846
arelent *reloc_entry;
849
asection *input_section;
851
char **error_message;
853
return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
854
input_section, output_bfd, error_message,
858
static const struct reloc_howto_struct *
859
coff_arm_reloc_type_lookup (abfd, code)
861
bfd_reloc_code_real_type code;
863
#define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
865
if (code == BFD_RELOC_CTOR)
866
switch (bfd_get_arch_info (abfd)->bits_per_address)
872
return (const struct reloc_howto_struct *) 0;
878
ASTD (BFD_RELOC_32, ARM_32);
879
ASTD (BFD_RELOC_RVA, ARM_RVA32);
880
ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
881
ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
883
ASTD (BFD_RELOC_8, ARM_8);
884
ASTD (BFD_RELOC_16, ARM_16);
885
ASTD (BFD_RELOC_32, ARM_32);
886
ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
887
ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
888
ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
889
ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
890
ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
891
ASTD (BFD_RELOC_RVA, ARM_RVA32);
892
ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
893
ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
894
ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
895
ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
897
default: return (const struct reloc_howto_struct *) 0;
901
#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
902
#define COFF_PAGE_SIZE 0x1000
903
/* Turn a howto into a reloc nunmber */
905
#define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
906
#define BADMAG(x) ARMBADMAG(x)
907
#define ARM 1 /* Customize coffcode.h */
910
/* Make sure that the 'r_offset' field is copied properly
911
so that identical binaries will compare the same. */
912
#define SWAP_IN_RELOC_OFFSET H_GET_32
913
#define SWAP_OUT_RELOC_OFFSET H_PUT_32
916
/* Extend the coff_link_hash_table structure with a few ARM specific fields.
917
This allows us to store global data here without actually creating any
918
global variables, which is a no-no in the BFD world. */
919
struct coff_arm_link_hash_table
921
/* The original coff_link_hash_table structure. MUST be first field. */
922
struct coff_link_hash_table root;
924
/* The size in bytes of the section containg the Thumb-to-ARM glue. */
925
bfd_size_type thumb_glue_size;
927
/* The size in bytes of the section containg the ARM-to-Thumb glue. */
928
bfd_size_type arm_glue_size;
930
/* An arbitary input BFD chosen to hold the glue sections. */
931
bfd * bfd_of_glue_owner;
933
/* Support interworking with old, non-interworking aware ARM code. */
934
int support_old_code;
937
/* Get the ARM coff linker hash table from a link_info structure. */
938
#define coff_arm_hash_table(info) \
939
((struct coff_arm_link_hash_table *) ((info)->hash))
941
/* Create an ARM coff linker hash table. */
943
static struct bfd_link_hash_table *
944
coff_arm_link_hash_table_create (abfd)
947
struct coff_arm_link_hash_table * ret;
948
bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
950
ret = (struct coff_arm_link_hash_table *) bfd_malloc (amt);
951
if (ret == (struct coff_arm_link_hash_table *) NULL)
954
if (! _bfd_coff_link_hash_table_init
955
(& ret->root, abfd, _bfd_coff_link_hash_newfunc))
958
return (struct bfd_link_hash_table *) NULL;
961
ret->thumb_glue_size = 0;
962
ret->arm_glue_size = 0;
963
ret->bfd_of_glue_owner = NULL;
965
return & ret->root.root;
969
arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
970
struct bfd_link_info *info;
972
asection *input_section;
973
bfd_vma reloc_offset;
975
bfd_vma addr = reloc_offset
977
+ input_section->output_offset
978
+ input_section->output_section->vma;
980
if (coff_data (output_bfd)->pe)
981
addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
982
fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
987
/* The thumb form of a long branch is a bit finicky, because the offset
988
encoding is split over two fields, each in it's own instruction. They
989
can occur in any order. So given a thumb form of long branch, and an
990
offset, insert the offset into the thumb branch and return finished
993
It takes two thumb instructions to encode the target address. Each has
994
11 bits to invest. The upper 11 bits are stored in one (identifed by
995
H-0.. see below), the lower 11 bits are stored in the other (identified
998
Combine together and shifted left by 1 (it's a half word address) and
1002
H-0, upper address-0 = 000
1004
H-1, lower address-0 = 800
1006
They can be ordered either way, but the arm tools I've seen always put
1007
the lower one first. It probably doesn't matter. krk@cygnus.com
1009
XXX: Actually the order does matter. The second instruction (H-1)
1010
moves the computed address into the PC, so it must be the second one
1011
in the sequence. The problem, however is that whilst little endian code
1012
stores the instructions in HI then LOW order, big endian code does the
1013
reverse. nickc@cygnus.com. */
1015
#define LOW_HI_ORDER 0xF800F000
1016
#define HI_LOW_ORDER 0xF000F800
1019
insert_thumb_branch (br_insn, rel_off)
1023
unsigned int low_bits;
1024
unsigned int high_bits;
1026
BFD_ASSERT((rel_off & 1) != 1);
1028
rel_off >>= 1; /* half word aligned address */
1029
low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
1030
high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
1032
if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
1033
br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
1034
else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
1035
br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
1037
/* FIXME: the BFD library should never abort except for internal errors
1038
- it should return an error status. */
1039
abort (); /* Error - not a valid branch instruction form. */
1045
static struct coff_link_hash_entry *
1046
find_thumb_glue (info, name, input_bfd)
1047
struct bfd_link_info *info;
1052
struct coff_link_hash_entry *myh;
1053
bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1055
tmp_name = (char *) bfd_malloc (amt);
1057
BFD_ASSERT (tmp_name);
1059
sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1061
myh = coff_link_hash_lookup
1062
(coff_hash_table (info), tmp_name, false, false, true);
1065
/* xgettext:c-format */
1066
_bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1067
bfd_archive_filename (input_bfd), tmp_name, name);
1073
#endif /* not ARM_WINCE */
1075
static struct coff_link_hash_entry *
1076
find_arm_glue (info, name, input_bfd)
1077
struct bfd_link_info *info;
1082
struct coff_link_hash_entry * myh;
1083
bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1085
tmp_name = (char *) bfd_malloc (amt);
1087
BFD_ASSERT (tmp_name);
1089
sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1091
myh = coff_link_hash_lookup
1092
(coff_hash_table (info), tmp_name, false, false, true);
1095
/* xgettext:c-format */
1096
_bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1097
bfd_archive_filename (input_bfd), tmp_name, name);
1109
ldr r12, __func_addr
1112
.word func @ behave as if you saw a ARM_32 reloc
1115
#define ARM2THUMB_GLUE_SIZE 12
1116
static const insn32 a2t1_ldr_insn = 0xe59fc000;
1117
static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1118
static const insn32 a2t3_func_addr_insn = 0x00000001;
1121
Thumb->ARM: Thumb->(non-interworking aware) ARM
1125
__func_from_thumb: __func_from_thumb:
1127
nop ldr r6, __func_addr
1129
__func_change_to_arm: bx r6
1131
__func_back_to_thumb:
1138
#define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1139
static const insn16 t2a1_bx_pc_insn = 0x4778;
1140
static const insn16 t2a2_noop_insn = 0x46c0;
1141
static const insn32 t2a3_b_insn = 0xea000000;
1143
static const insn16 t2a1_push_insn = 0xb540;
1144
static const insn16 t2a2_ldr_insn = 0x4e03;
1145
static const insn16 t2a3_mov_insn = 0x46fe;
1146
static const insn16 t2a4_bx_insn = 0x4730;
1147
static const insn32 t2a5_pop_insn = 0xe8bd4040;
1148
static const insn32 t2a6_bx_insn = 0xe12fff1e;
1151
We should really create new local (static) symbols in destination
1152
object for each stub we create. We should also create local
1153
(static) symbols within the stubs when switching between ARM and
1154
Thumb code. This will ensure that the debugger and disassembler
1155
can present a better view of stubs.
1157
We can treat stubs like literal sections, and for the THUMB9 ones
1158
(short addressing range) we should be able to insert the stubs
1159
between sections. i.e. the simplest approach (since relocations
1160
are done on a section basis) is to dump the stubs at the end of
1161
processing a section. That way we can always try and minimise the
1162
offset to and from a stub. However, this does not map well onto
1163
the way that the linker/BFD does its work: mapping all input
1164
sections to output sections via the linker script before doing
1167
Unfortunately it may be easier to just to disallow short range
1168
Thumb->ARM stubs (i.e. no conditional inter-working branches,
1169
only branch-and-link (BL) calls. This will simplify the processing
1170
since we can then put all of the stubs into their own section.
1173
On a different subject, rather than complaining when a
1174
branch cannot fit in the number of bits available for the
1175
instruction we should generate a trampoline stub (needed to
1176
address the complete 32bit address space). */
1178
/* The standard COFF backend linker does not cope with the special
1179
Thumb BRANCH23 relocation. The alternative would be to split the
1180
BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1181
bit simpler simply providing our own relocation driver. */
1183
/* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1184
This code is a very slightly modified copy of
1185
_bfd_coff_generic_relocate_section. It would be a much more
1186
maintainable solution to have a MACRO that could be expanded within
1187
_bfd_coff_generic_relocate_section that would only be provided for
1188
ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1189
is different from the original. */
1192
coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1193
contents, relocs, syms, sections)
1195
struct bfd_link_info *info;
1197
asection *input_section;
1199
struct internal_reloc *relocs;
1200
struct internal_syment *syms;
1201
asection **sections;
1203
struct internal_reloc * rel;
1204
struct internal_reloc * relend;
1207
relend = rel + input_section->reloc_count;
1209
for (; rel < relend; rel++)
1213
struct coff_link_hash_entry * h;
1214
struct internal_syment * sym;
1217
reloc_howto_type * howto;
1218
bfd_reloc_status_type rstat;
1221
symndx = rel->r_symndx;
1230
h = obj_coff_sym_hashes (input_bfd)[symndx];
1231
sym = syms + symndx;
1234
/* COFF treats common symbols in one of two ways. Either the
1235
size of the symbol is included in the section contents, or it
1236
is not. We assume that the size is not included, and force
1237
the rtype_to_howto function to adjust the addend as needed. */
1239
if (sym != NULL && sym->n_scnum != 0)
1240
addend = - sym->n_value;
1244
howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1249
/* The relocation_section function will skip pcrel_offset relocs
1250
when doing a relocateable link. However, we want to convert
1251
ARM26 to ARM26D relocs if possible. We return a fake howto in
1252
this case without pcrel_offset set, and adjust the addend to
1254
if (rel->r_type == ARM_26
1256
&& info->relocateable
1257
&& (h->root.type == bfd_link_hash_defined
1258
|| h->root.type == bfd_link_hash_defweak)
1259
&& (h->root.u.def.section->output_section
1260
== input_section->output_section))
1262
static reloc_howto_type fake_arm26_reloc =
1269
complain_overflow_signed,
1270
aoutarm_fix_pcrel_26 ,
1277
addend -= rel->r_vaddr - input_section->vma;
1278
howto = &fake_arm26_reloc;
1282
/* MS ARM-CE makes the reloc relative to the opcode's pc, not
1283
the next opcode's pc, so is off by one. */
1284
if (howto->pc_relative && !info->relocateable)
1288
/* If we are doing a relocateable link, then we can just ignore
1289
a PC relative reloc that is pcrel_offset. It will already
1290
have the correct value. If this is not a relocateable link,
1291
then we should ignore the symbol value. */
1292
if (howto->pc_relative && howto->pcrel_offset)
1294
if (info->relocateable)
1296
/* FIXME - it is not clear which targets need this next test
1297
and which do not. It is known that it is needed for the
1298
VxWorks and EPOC-PE targets, but it is also known that it
1299
was supressed for other ARM targets. This ought to be
1300
sorted out one day. */
1301
#ifdef ARM_COFF_BUGFIX
1302
/* We must not ignore the symbol value. If the symbol is
1303
within the same section, the relocation should have already
1304
been fixed, but if it is not, we'll be handed a reloc into
1305
the beginning of the symbol's section, so we must not cancel
1306
out the symbol's value, otherwise we'll be adding it in
1308
if (sym != NULL && sym->n_scnum != 0)
1309
addend += sym->n_value;
1321
sec = bfd_abs_section_ptr;
1326
sec = sections[symndx];
1327
val = (sec->output_section->vma
1328
+ sec->output_offset
1335
#if 1 /* THUMBEXTENSION */
1336
/* We don't output the stubs if we are generating a
1337
relocatable output file, since we may as well leave the
1338
stub generation to the final linker pass. If we fail to
1339
verify that the name is defined, we'll try to build stubs
1340
for an undefined name... */
1341
if (! info->relocateable
1342
&& ( h->root.type == bfd_link_hash_defined
1343
|| h->root.type == bfd_link_hash_defweak))
1345
asection * h_sec = h->root.u.def.section;
1346
const char * name = h->root.root.string;
1348
/* h locates the symbol referenced in the reloc. */
1349
h_val = (h->root.u.def.value
1350
+ h_sec->output_section->vma
1351
+ h_sec->output_offset);
1353
if (howto->type == ARM_26)
1355
if ( h->class == C_THUMBSTATFUNC
1356
|| h->class == C_THUMBEXTFUNC)
1358
/* Arm code calling a Thumb function. */
1359
unsigned long int tmp;
1362
long int ret_offset;
1363
struct coff_link_hash_entry * myh;
1364
struct coff_arm_link_hash_table * globals;
1366
myh = find_arm_glue (info, name, input_bfd);
1370
globals = coff_arm_hash_table (info);
1372
BFD_ASSERT (globals != NULL);
1373
BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1375
my_offset = myh->root.u.def.value;
1377
s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1378
ARM2THUMB_GLUE_SECTION_NAME);
1379
BFD_ASSERT (s != NULL);
1380
BFD_ASSERT (s->contents != NULL);
1381
BFD_ASSERT (s->output_section != NULL);
1383
if ((my_offset & 0x01) == 0x01)
1385
if (h_sec->owner != NULL
1386
&& INTERWORK_SET (h_sec->owner)
1387
&& ! INTERWORK_FLAG (h_sec->owner))
1390
/* xgettext:c-format */
1391
(_("%s(%s): warning: interworking not enabled."),
1392
bfd_archive_filename (h_sec->owner), name);
1394
/* xgettext:c-format */
1395
(_(" first occurrence: %s: arm call to thumb"),
1396
bfd_archive_filename (input_bfd));
1400
myh->root.u.def.value = my_offset;
1402
bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1403
s->contents + my_offset);
1405
bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1406
s->contents + my_offset + 4);
1408
/* It's a thumb address. Add the low order bit. */
1409
bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1410
s->contents + my_offset + 8);
1412
if (info->base_file)
1413
arm_emit_base_file_entry (info, output_bfd, s,
1418
BFD_ASSERT (my_offset <= globals->arm_glue_size);
1420
tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1421
- input_section->vma);
1423
tmp = tmp & 0xFF000000;
1425
/* Somehow these are both 4 too far, so subtract 8. */
1429
+ s->output_section->vma
1430
- (input_section->output_offset
1431
+ input_section->output_section->vma
1435
tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1437
bfd_put_32 (output_bfd, (bfd_vma) tmp,
1438
contents + rel->r_vaddr - input_section->vma);
1444
/* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1445
else if (howto->type == ARM_THUMB23)
1447
if ( h->class == C_EXT
1448
|| h->class == C_STAT
1449
|| h->class == C_LABEL)
1451
/* Thumb code calling an ARM function */
1454
unsigned long int tmp;
1455
long int ret_offset;
1456
struct coff_link_hash_entry * myh;
1457
struct coff_arm_link_hash_table * globals;
1459
myh = find_thumb_glue (info, name, input_bfd);
1463
globals = coff_arm_hash_table (info);
1465
BFD_ASSERT (globals != NULL);
1466
BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1468
my_offset = myh->root.u.def.value;
1470
s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1471
THUMB2ARM_GLUE_SECTION_NAME);
1473
BFD_ASSERT (s != NULL);
1474
BFD_ASSERT (s->contents != NULL);
1475
BFD_ASSERT (s->output_section != NULL);
1477
if ((my_offset & 0x01) == 0x01)
1479
if (h_sec->owner != NULL
1480
&& INTERWORK_SET (h_sec->owner)
1481
&& ! INTERWORK_FLAG (h_sec->owner)
1482
&& ! globals->support_old_code)
1485
/* xgettext:c-format */
1486
(_("%s(%s): warning: interworking not enabled."),
1487
bfd_archive_filename (h_sec->owner), name);
1489
/* xgettext:c-format */
1490
(_(" first occurrence: %s: thumb call to arm"),
1491
bfd_archive_filename (input_bfd));
1493
(_(" consider relinking with --support-old-code enabled"));
1497
myh->root.u.def.value = my_offset;
1499
if (globals->support_old_code)
1501
bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1502
s->contents + my_offset);
1504
bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1505
s->contents + my_offset + 2);
1507
bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1508
s->contents + my_offset + 4);
1510
bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1511
s->contents + my_offset + 6);
1513
bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1514
s->contents + my_offset + 8);
1516
bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1517
s->contents + my_offset + 12);
1519
/* Store the address of the function in the last word of the stub. */
1520
bfd_put_32 (output_bfd, h_val,
1521
s->contents + my_offset + 16);
1523
if (info->base_file)
1524
arm_emit_base_file_entry (info, output_bfd, s,
1529
bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1530
s->contents + my_offset);
1532
bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1533
s->contents + my_offset + 2);
1536
((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1538
(s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1539
+ my_offset /* Offset of the start of this stub from the start of the stubs. */
1540
+ s->output_section->vma) /* Address of the start of the current section. */
1541
+ 4 /* The branch instruction is 4 bytes into the stub. */
1542
+ 8); /* ARM branches work from the pc of the instruction + 8. */
1544
bfd_put_32 (output_bfd,
1545
(bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1546
s->contents + my_offset + 4);
1551
BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1553
/* Now go back and fix up the original BL insn to point
1558
- (input_section->output_offset
1562
tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1563
- input_section->vma);
1565
bfd_put_32 (output_bfd,
1566
(bfd_vma) insert_thumb_branch (tmp,
1568
contents + rel->r_vaddr - input_section->vma);
1576
/* If the relocation type and destination symbol does not
1577
fall into one of the above categories, then we can just
1578
perform a direct link. */
1581
rstat = bfd_reloc_ok;
1583
#endif /* THUMBEXTENSION */
1584
if ( h->root.type == bfd_link_hash_defined
1585
|| h->root.type == bfd_link_hash_defweak)
1589
sec = h->root.u.def.section;
1590
val = (h->root.u.def.value
1591
+ sec->output_section->vma
1592
+ sec->output_offset);
1595
else if (! info->relocateable)
1597
if (! ((*info->callbacks->undefined_symbol)
1598
(info, h->root.root.string, input_bfd, input_section,
1599
rel->r_vaddr - input_section->vma, true)))
1604
if (info->base_file)
1606
/* Emit a reloc if the backend thinks it needs it. */
1607
if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1608
arm_emit_base_file_entry (info, output_bfd, input_section,
1612
#if 1 /* THUMBEXTENSION */
1614
rstat = bfd_reloc_ok;
1616
/* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1617
else if (! info->relocateable
1618
&& howto->type == ARM_THUMB23)
1620
/* This is pretty much a copy of what the default
1621
_bfd_final_link_relocate and _bfd_relocate_contents
1622
routines do to perform a relocation, with special
1623
processing for the split addressing of the Thumb BL
1624
instruction. Again, it would probably be simpler adding a
1625
ThumbBRANCH23 specific macro expansion into the default
1628
bfd_vma address = rel->r_vaddr - input_section->vma;
1630
if (address > input_section->_raw_size)
1631
rstat = bfd_reloc_outofrange;
1634
bfd_vma relocation = val + addend;
1635
int size = bfd_get_reloc_size (howto);
1636
boolean overflow = false;
1637
bfd_byte * location = contents + address;
1638
bfd_vma x = bfd_get_32 (input_bfd, location);
1639
bfd_vma src_mask = 0x007FFFFE;
1640
bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1641
bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1643
bfd_signed_vma signed_check;
1645
bfd_signed_vma signed_add;
1647
BFD_ASSERT (size == 4);
1649
/* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1650
relocation -= (input_section->output_section->vma
1651
+ input_section->output_offset);
1653
/* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1654
relocation -= address;
1656
/* No need to negate the relocation with BRANCH23. */
1657
/* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1658
/* howto->rightshift == 1 */
1660
/* Drop unwanted bits from the value we are relocating to. */
1661
check = relocation >> howto->rightshift;
1663
/* If this is a signed value, the rightshift just dropped
1664
leading 1 bits (assuming twos complement). */
1665
if ((bfd_signed_vma) relocation >= 0)
1666
signed_check = check;
1668
signed_check = (check
1670
& ~((bfd_vma) - 1 >> howto->rightshift)));
1672
/* Get the value from the object file. */
1673
if (bfd_big_endian (input_bfd))
1674
add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1676
add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1678
/* Get the value from the object file with an appropriate sign.
1679
The expression involving howto->src_mask isolates the upper
1680
bit of src_mask. If that bit is set in the value we are
1681
adding, it is negative, and we subtract out that number times
1682
two. If src_mask includes the highest possible bit, then we
1683
can not get the upper bit, but that does not matter since
1684
signed_add needs no adjustment to become negative in that
1688
if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1689
signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1691
/* howto->bitpos == 0 */
1692
/* Add the value from the object file, shifted so that it is a
1694
signed_check += signed_add;
1695
relocation += signed_add;
1697
BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1699
/* Assumes two's complement. */
1700
if ( signed_check > reloc_signed_max
1701
|| signed_check < reloc_signed_min)
1704
/* Put the relocation into the correct bits.
1705
For a BLX instruction, make sure that the relocation is rounded up
1706
to a word boundary. This follows the semantics of the instruction
1707
which specifies that bit 1 of the target address will come from bit
1708
1 of the base address. */
1709
if (bfd_big_endian (input_bfd))
1711
if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1713
relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1717
if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1719
relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1722
/* Add the relocation to the correct bits of X. */
1723
x = ((x & ~howto->dst_mask) | relocation);
1725
/* Put the relocated value back in the object file. */
1726
bfd_put_32 (input_bfd, x, location);
1728
rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1733
#endif /* THUMBEXTENSION */
1734
rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1736
rel->r_vaddr - input_section->vma,
1738
#if 1 /* THUMBEXTENSION */
1740
Is this the best way to fix up thumb addresses? krk@cygnus.com
1741
Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1742
/* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1743
if (! info->relocateable
1744
&& (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1746
/* Determine if we need to set the bottom bit of a relocated address
1747
because the address is the address of a Thumb code symbol. */
1749
int patchit = false;
1752
&& ( h->class == C_THUMBSTATFUNC
1753
|| h->class == C_THUMBEXTFUNC))
1757
else if (sym != NULL
1758
&& sym->n_scnum > N_UNDEF)
1760
/* No hash entry - use the symbol instead. */
1762
if ( sym->n_sclass == C_THUMBSTATFUNC
1763
|| sym->n_sclass == C_THUMBEXTFUNC)
1769
bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1770
bfd_vma x = bfd_get_32 (input_bfd, location);
1772
bfd_put_32 (input_bfd, x | 1, location);
1775
#endif /* THUMBEXTENSION */
1783
case bfd_reloc_outofrange:
1784
(*_bfd_error_handler)
1785
(_("%s: bad reloc address 0x%lx in section `%s'"),
1786
bfd_archive_filename (input_bfd),
1787
(unsigned long) rel->r_vaddr,
1788
bfd_get_section_name (input_bfd, input_section));
1790
case bfd_reloc_overflow:
1793
char buf[SYMNMLEN + 1];
1798
name = h->root.root.string;
1801
name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1806
if (! ((*info->callbacks->reloc_overflow)
1807
(info, name, howto->name, (bfd_vma) 0, input_bfd,
1808
input_section, rel->r_vaddr - input_section->vma)))
1817
#ifndef COFF_IMAGE_WITH_PE
1820
bfd_arm_allocate_interworking_sections (info)
1821
struct bfd_link_info * info;
1825
struct coff_arm_link_hash_table * globals;
1827
static char test_char = '1';
1830
globals = coff_arm_hash_table (info);
1832
BFD_ASSERT (globals != NULL);
1834
if (globals->arm_glue_size != 0)
1836
BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1838
s = bfd_get_section_by_name
1839
(globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1841
BFD_ASSERT (s != NULL);
1843
foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1844
globals->arm_glue_size);
1846
memset (foo, test_char, (size_t) globals->arm_glue_size);
1849
s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1853
if (globals->thumb_glue_size != 0)
1855
BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1857
s = bfd_get_section_by_name
1858
(globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1860
BFD_ASSERT (s != NULL);
1862
foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1863
globals->thumb_glue_size);
1865
memset (foo, test_char, (size_t) globals->thumb_glue_size);
1868
s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1876
record_arm_to_thumb_glue (info, h)
1877
struct bfd_link_info * info;
1878
struct coff_link_hash_entry * h;
1880
const char * name = h->root.root.string;
1881
register asection * s;
1883
struct coff_link_hash_entry * myh;
1884
struct coff_arm_link_hash_table * globals;
1888
globals = coff_arm_hash_table (info);
1890
BFD_ASSERT (globals != NULL);
1891
BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1893
s = bfd_get_section_by_name
1894
(globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1896
BFD_ASSERT (s != NULL);
1898
amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1899
tmp_name = (char *) bfd_malloc (amt);
1901
BFD_ASSERT (tmp_name);
1903
sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1905
myh = coff_link_hash_lookup
1906
(coff_hash_table (info), tmp_name, false, false, true);
1911
return; /* we've already seen this guy */
1914
/* The only trick here is using globals->arm_glue_size as the value. Even
1915
though the section isn't allocated yet, this is where we will be putting
1918
val = globals->arm_glue_size + 1;
1919
bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1920
BSF_GLOBAL, s, val, NULL, true, false,
1921
(struct bfd_link_hash_entry **) & myh);
1925
globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1932
record_thumb_to_arm_glue (info, h)
1933
struct bfd_link_info * info;
1934
struct coff_link_hash_entry * h;
1936
const char * name = h->root.root.string;
1937
register asection * s;
1939
struct coff_link_hash_entry * myh;
1940
struct coff_arm_link_hash_table * globals;
1944
globals = coff_arm_hash_table (info);
1946
BFD_ASSERT (globals != NULL);
1947
BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1949
s = bfd_get_section_by_name
1950
(globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1952
BFD_ASSERT (s != NULL);
1954
amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1955
tmp_name = (char *) bfd_malloc (amt);
1957
BFD_ASSERT (tmp_name);
1959
sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1961
myh = coff_link_hash_lookup
1962
(coff_hash_table (info), tmp_name, false, false, true);
1967
return; /* we've already seen this guy */
1970
val = globals->thumb_glue_size + 1;
1971
bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1972
BSF_GLOBAL, s, val, NULL, true, false,
1973
(struct bfd_link_hash_entry **) &myh);
1975
/* If we mark it 'thumb', the disassembler will do a better job. */
1976
myh->class = C_THUMBEXTFUNC;
1980
/* Allocate another symbol to mark where we switch to arm mode. */
1982
#define CHANGE_TO_ARM "__%s_change_to_arm"
1983
#define BACK_FROM_ARM "__%s_back_from_arm"
1985
amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1986
tmp_name = (char *) bfd_malloc (amt);
1988
BFD_ASSERT (tmp_name);
1990
sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1993
val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1994
bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1995
BSF_LOCAL, s, val, NULL, true, false,
1996
(struct bfd_link_hash_entry **) & myh);
2000
globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
2004
#endif /* not ARM_WINCE */
2006
/* Select a BFD to be used to hold the sections used by the glue code.
2007
This function is called from the linker scripts in ld/emultempl/
2011
bfd_arm_get_bfd_for_interworking (abfd, info)
2013
struct bfd_link_info * info;
2015
struct coff_arm_link_hash_table * globals;
2019
/* If we are only performing a partial link do not bother
2020
getting a bfd to hold the glue. */
2021
if (info->relocateable)
2024
globals = coff_arm_hash_table (info);
2026
BFD_ASSERT (globals != NULL);
2028
if (globals->bfd_of_glue_owner != NULL)
2031
sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2035
flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2037
sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2040
|| ! bfd_set_section_flags (abfd, sec, flags)
2041
|| ! bfd_set_section_alignment (abfd, sec, 2))
2045
sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2049
flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2051
sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2054
|| ! bfd_set_section_flags (abfd, sec, flags)
2055
|| ! bfd_set_section_alignment (abfd, sec, 2))
2059
/* Save the bfd for later use. */
2060
globals->bfd_of_glue_owner = abfd;
2066
bfd_arm_process_before_allocation (abfd, info, support_old_code)
2068
struct bfd_link_info * info;
2069
int support_old_code;
2072
struct coff_arm_link_hash_table * globals;
2074
/* If we are only performing a partial link do not bother
2075
to construct any glue. */
2076
if (info->relocateable)
2079
/* Here we have a bfd that is to be included on the link. We have a hook
2080
to do reloc rummaging, before section sizes are nailed down. */
2082
_bfd_coff_get_external_symbols (abfd);
2084
globals = coff_arm_hash_table (info);
2086
BFD_ASSERT (globals != NULL);
2087
BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2089
globals->support_old_code = support_old_code;
2091
/* Rummage around all the relocs and map the glue vectors. */
2092
sec = abfd->sections;
2097
for (; sec != NULL; sec = sec->next)
2099
struct internal_reloc * i;
2100
struct internal_reloc * rel;
2102
if (sec->reloc_count == 0)
2105
/* Load the relocs. */
2106
/* FIXME: there may be a storage leak here. */
2108
i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2110
BFD_ASSERT (i != 0);
2112
for (rel = i; rel < i + sec->reloc_count; ++rel)
2114
unsigned short r_type = rel->r_type;
2116
struct coff_link_hash_entry * h;
2118
symndx = rel->r_symndx;
2120
/* If the relocation is not against a symbol it cannot concern us. */
2124
/* If the index is outside of the range of our table, something has gone wrong. */
2125
if (symndx >= obj_conv_table_size (abfd))
2127
_bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2128
bfd_archive_filename (abfd), symndx);
2132
h = obj_coff_sym_hashes (abfd)[symndx];
2134
/* If the relocation is against a static symbol it must be within
2135
the current section and so cannot be a cross ARM/Thumb relocation. */
2142
/* This one is a call from arm code. We need to look up
2143
the target of the call. If it is a thumb target, we
2146
if (h->class == C_THUMBEXTFUNC)
2147
record_arm_to_thumb_glue (info, h);
2152
/* This one is a call from thumb code. We used to look
2153
for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2154
up the target of the call. If it is an arm target, we
2155
insert glue. If the symbol does not exist it will be
2156
given a class of C_EXT and so we will generate a stub
2157
for it. This is not really a problem, since the link
2158
is doomed anyway. */
2165
record_thumb_to_arm_glue (info, h);
2182
#endif /* ! defined (COFF_IMAGE_WITH_PE) */
2184
#define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2185
#define coff_relocate_section coff_arm_relocate_section
2186
#define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2187
#define coff_adjust_symndx coff_arm_adjust_symndx
2188
#define coff_link_output_has_begun coff_arm_link_output_has_begun
2189
#define coff_final_link_postscript coff_arm_final_link_postscript
2190
#define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2191
#define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2192
#define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2193
#define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2194
#define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2196
/* When doing a relocateable link, we want to convert ARM26 relocs
2197
into ARM26D relocs. */
2200
coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2201
bfd *obfd ATTRIBUTE_UNUSED;
2202
struct bfd_link_info *info ATTRIBUTE_UNUSED;
2205
struct internal_reloc *irel;
2208
if (irel->r_type == 3)
2210
struct coff_link_hash_entry *h;
2212
h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2214
&& (h->root.type == bfd_link_hash_defined
2215
|| h->root.type == bfd_link_hash_defweak)
2216
&& h->root.u.def.section->output_section == sec->output_section)
2223
/* Called when merging the private data areas of two BFDs.
2224
This is important as it allows us to detect if we are
2225
attempting to merge binaries compiled for different ARM
2226
targets, eg different CPUs or differents APCS's. */
2229
coff_arm_merge_private_bfd_data (ibfd, obfd)
2233
BFD_ASSERT (ibfd != NULL && obfd != NULL);
2238
/* If the two formats are different we cannot merge anything.
2239
This is not an error, since it is permissable to change the
2240
input and output formats. */
2241
if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2242
|| obfd->xvec->flavour != bfd_target_coff_flavour)
2245
/* Verify that the APCS is the same for the two BFDs */
2246
if (APCS_SET (ibfd))
2248
if (APCS_SET (obfd))
2250
/* If the src and dest have different APCS flag bits set, fail. */
2251
if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2254
/* xgettext: c-format */
2255
(_("ERROR: %s is compiled for APCS-%d, whereas %s is compiled for APCS-%d"),
2256
bfd_archive_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2257
bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2260
bfd_set_error (bfd_error_wrong_format);
2264
if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2268
if (APCS_FLOAT_FLAG (ibfd))
2269
/* xgettext: c-format */
2270
msg = _("ERROR: %s passes floats in float registers, whereas %s passes them in integer registers");
2272
/* xgettext: c-format */
2273
msg = _("ERROR: %s passes floats in integer registers, whereas %s passes them in float registers");
2275
_bfd_error_handler (msg, bfd_archive_filename (ibfd),
2276
bfd_get_filename (obfd));
2278
bfd_set_error (bfd_error_wrong_format);
2282
if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2286
if (PIC_FLAG (ibfd))
2287
/* xgettext: c-format */
2288
msg = _("ERROR: %s is compiled as position independent code, whereas target %s is absolute position");
2290
/* xgettext: c-format */
2291
msg = _("ERROR: %s is compiled as absolute position code, whereas target %s is position independent");
2292
_bfd_error_handler (msg, bfd_archive_filename (ibfd),
2293
bfd_get_filename (obfd));
2295
bfd_set_error (bfd_error_wrong_format);
2301
SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2303
/* Set up the arch and fields as well as these are probably wrong. */
2304
bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2308
/* Check the interworking support. */
2309
if (INTERWORK_SET (ibfd))
2311
if (INTERWORK_SET (obfd))
2313
/* If the src and dest differ in their interworking issue a warning. */
2314
if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2318
if (INTERWORK_FLAG (ibfd))
2319
/* xgettext: c-format */
2320
msg = _("Warning: %s supports interworking, whereas %s does not");
2322
/* xgettext: c-format */
2323
msg = _("Warning: %s does not support interworking, whereas %s does");
2325
_bfd_error_handler (msg, bfd_archive_filename (ibfd),
2326
bfd_get_filename (obfd));
2331
SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2338
/* Display the flags field. */
2341
coff_arm_print_private_bfd_data (abfd, ptr)
2345
FILE * file = (FILE *) ptr;
2347
BFD_ASSERT (abfd != NULL && ptr != NULL);
2349
/* xgettext:c-format */
2350
fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2352
if (APCS_SET (abfd))
2354
/* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2355
fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2357
if (APCS_FLOAT_FLAG (abfd))
2358
fprintf (file, _(" [floats passed in float registers]"));
2360
fprintf (file, _(" [floats passed in integer registers]"));
2362
if (PIC_FLAG (abfd))
2363
fprintf (file, _(" [position independent]"));
2365
fprintf (file, _(" [absolute position]"));
2368
if (! INTERWORK_SET (abfd))
2369
fprintf (file, _(" [interworking flag not initialised]"));
2370
else if (INTERWORK_FLAG (abfd))
2371
fprintf (file, _(" [interworking supported]"));
2373
fprintf (file, _(" [interworking not supported]"));
2380
/* Copies the given flags into the coff_tdata.flags field.
2381
Typically these flags come from the f_flags[] field of
2382
the COFF filehdr structure, which contains important,
2383
target specific information.
2384
Note: Although this function is static, it is explicitly
2385
called from both coffcode.h and peicode.h. */
2388
_bfd_coff_arm_set_private_flags (abfd, flags)
2394
BFD_ASSERT (abfd != NULL);
2396
flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2398
/* Make sure that the APCS field has not been initialised to the opposite
2401
&& ( (APCS_26_FLAG (abfd) != flag)
2402
|| (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2403
|| (PIC_FLAG (abfd) != (flags & F_PIC))
2407
flag |= (flags & (F_APCS_FLOAT | F_PIC));
2409
SET_APCS_FLAGS (abfd, flag);
2411
flag = (flags & F_INTERWORK);
2413
/* If the BFD has already had its interworking flag set, but it
2414
is different from the value that we have been asked to set,
2415
then assume that that merged code will not support interworking
2416
and set the flag accordingly. */
2417
if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2420
/* xgettext: c-format */
2421
_bfd_error_handler (_("Warning: Not setting interworking flag of %s since it has already been specified as non-interworking"),
2422
bfd_archive_filename (abfd));
2424
/* xgettext: c-format */
2425
_bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2426
bfd_archive_filename (abfd));
2430
SET_INTERWORK_FLAG (abfd, flag);
2435
/* Copy the important parts of the target specific data
2436
from one instance of a BFD to another. */
2439
coff_arm_copy_private_bfd_data (src, dest)
2443
BFD_ASSERT (src != NULL && dest != NULL);
2448
/* If the destination is not in the same format as the source, do not do
2450
if (src->xvec != dest->xvec)
2453
/* copy the flags field */
2456
if (APCS_SET (dest))
2458
/* If the src and dest have different APCS flag bits set, fail. */
2459
if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2462
if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2465
if (PIC_FLAG (dest) != PIC_FLAG (src))
2469
SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2473
if (INTERWORK_SET (src))
2475
if (INTERWORK_SET (dest))
2477
/* If the src and dest have different interworking flags then turn
2478
off the interworking bit. */
2479
if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2481
if (INTERWORK_FLAG (dest))
2483
/* xgettext:c-format */
2484
_bfd_error_handler (("\
2485
Warning: Clearing the interworking flag of %s because non-interworking code in %s has been linked with it"),
2486
bfd_get_filename (dest),
2487
bfd_archive_filename (src));
2490
SET_INTERWORK_FLAG (dest, 0);
2495
SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2502
/* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2503
*must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2504
#define LOCAL_LABEL_PREFIX ""
2505
#ifndef USER_LABEL_PREFIX
2506
#define USER_LABEL_PREFIX "_"
2509
/* Like _bfd_coff_is_local_label_name, but
2510
a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2512
b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2513
labels of the form Lxxx to be stripped. */
2515
coff_arm_is_local_label_name (abfd, name)
2516
bfd * abfd ATTRIBUTE_UNUSED;
2519
#ifdef USER_LABEL_PREFIX
2520
if (USER_LABEL_PREFIX[0] != 0)
2522
if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2527
#ifdef LOCAL_LABEL_PREFIX
2528
/* If there is a prefix for local labels then look for this.
2529
If the prefix exists, but it is empty, then ignore the test. */
2531
if (LOCAL_LABEL_PREFIX[0] != 0)
2533
size_t len = strlen (LOCAL_LABEL_PREFIX);
2535
if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2538
/* Perform the checks below for the rest of the name. */
2543
return name[0] == 'L';
2546
/* This piece of machinery exists only to guarantee that the bfd that holds
2547
the glue section is written last.
2549
This does depend on bfd_make_section attaching a new section to the
2550
end of the section list for the bfd.
2555
coff_arm_link_output_has_begun (sub, info)
2557
struct coff_final_link_info * info;
2559
return (sub->output_has_begun
2560
|| sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2564
coff_arm_final_link_postscript (abfd, pfinfo)
2565
bfd * abfd ATTRIBUTE_UNUSED;
2566
struct coff_final_link_info * pfinfo;
2568
struct coff_arm_link_hash_table * globals;
2570
globals = coff_arm_hash_table (pfinfo->info);
2572
BFD_ASSERT (globals != NULL);
2574
if (globals->bfd_of_glue_owner != NULL)
2576
if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2579
globals->bfd_of_glue_owner->output_has_begun = true;
2585
#include "coffcode.h"
2587
#ifndef TARGET_LITTLE_SYM
2588
#define TARGET_LITTLE_SYM armcoff_little_vec
2590
#ifndef TARGET_LITTLE_NAME
2591
#define TARGET_LITTLE_NAME "coff-arm-little"
2593
#ifndef TARGET_BIG_SYM
2594
#define TARGET_BIG_SYM armcoff_big_vec
2596
#ifndef TARGET_BIG_NAME
2597
#define TARGET_BIG_NAME "coff-arm-big"
2600
#ifndef TARGET_UNDERSCORE
2601
#define TARGET_UNDERSCORE 0
2604
#ifndef EXTRA_S_FLAGS
2606
#define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2608
#define EXTRA_S_FLAGS 0
2612
/* Forward declaration for use initialising alternative_target field. */
2613
extern const bfd_target TARGET_BIG_SYM ;
2615
/* Target vectors. */
2616
CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2617
CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)
added
removed
binutils/bfd/coff-arm.c
