702 lines
20 KiB
C
702 lines
20 KiB
C
/* ldlang.h - linker command language support
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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This file is part of the GNU Binutils.
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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 3 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., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#ifndef LDLANG_H
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#define LDLANG_H
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#define DEFAULT_MEMORY_REGION "*default*"
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typedef enum
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{
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lang_input_file_is_l_enum,
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lang_input_file_is_symbols_only_enum,
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lang_input_file_is_marker_enum,
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lang_input_file_is_fake_enum,
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lang_input_file_is_search_file_enum,
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lang_input_file_is_file_enum
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} lang_input_file_enum_type;
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struct _fill_type
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{
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size_t size;
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unsigned char data[1];
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};
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typedef struct statement_list
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{
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union lang_statement_union * head;
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union lang_statement_union ** tail;
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} lang_statement_list_type;
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typedef struct memory_region_name_struct
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{
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const char * name;
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struct memory_region_name_struct * next;
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} lang_memory_region_name;
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typedef struct memory_region_struct
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{
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lang_memory_region_name name_list;
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struct memory_region_struct *next;
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union etree_union *origin_exp;
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bfd_vma origin;
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bfd_size_type length;
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union etree_union *length_exp;
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bfd_vma current;
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union lang_statement_union *last_os;
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flagword flags;
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flagword not_flags;
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bfd_boolean had_full_message;
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} lang_memory_region_type;
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enum statement_enum
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{
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lang_address_statement_enum,
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lang_assignment_statement_enum,
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lang_data_statement_enum,
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lang_fill_statement_enum,
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lang_group_statement_enum,
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lang_input_section_enum,
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lang_input_statement_enum,
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lang_insert_statement_enum,
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lang_output_section_statement_enum,
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lang_output_statement_enum,
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lang_padding_statement_enum,
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lang_reloc_statement_enum,
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lang_target_statement_enum,
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lang_wild_statement_enum,
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lang_constructors_statement_enum,
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lang_object_symbols_statement_enum
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};
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typedef struct lang_statement_header_struct
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{
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/* Next pointer for statement_list statement list. */
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union lang_statement_union *next;
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enum statement_enum type;
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} lang_statement_header_type;
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typedef struct
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{
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lang_statement_header_type header;
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union etree_union *exp;
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} lang_assignment_statement_type;
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typedef struct lang_target_statement_struct
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{
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lang_statement_header_type header;
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const char *target;
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} lang_target_statement_type;
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typedef struct lang_output_statement_struct
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{
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lang_statement_header_type header;
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const char *name;
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} lang_output_statement_type;
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/* Section types specified in a linker script. */
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enum section_type
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{
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normal_section,
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first_overlay_section,
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overlay_section,
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noload_section,
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noalloc_section
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};
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/* This structure holds a list of program headers describing
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segments in which this section should be placed. */
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typedef struct lang_output_section_phdr_list
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{
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struct lang_output_section_phdr_list *next;
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const char *name;
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bfd_boolean used;
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} lang_output_section_phdr_list;
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typedef struct lang_output_section_statement_struct
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{
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lang_statement_header_type header;
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lang_statement_list_type children;
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struct lang_output_section_statement_struct *next;
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struct lang_output_section_statement_struct *prev;
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const char *name;
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asection *bfd_section;
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lang_memory_region_type *region;
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lang_memory_region_type *lma_region;
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fill_type *fill;
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union etree_union *addr_tree;
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union etree_union *load_base;
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union etree_union *section_alignment;
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union etree_union *subsection_alignment;
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/* If non-null, an expression to evaluate after setting the section's
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size. The expression is evaluated inside REGION (above) with '.'
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set to the end of the section. Used in the last overlay section
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to move '.' past all the overlaid sections. */
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union etree_union *update_dot_tree;
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lang_output_section_phdr_list *phdrs;
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unsigned int block_value;
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int constraint;
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flagword flags;
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enum section_type sectype;
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unsigned int processed_vma : 1;
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unsigned int processed_lma : 1;
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unsigned int all_input_readonly : 1;
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/* If this section should be ignored. */
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unsigned int ignored : 1;
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/* If this section should update "dot". Prevents section being ignored. */
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unsigned int update_dot : 1;
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/* If this section is after assignment to _end. */
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unsigned int after_end : 1;
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/* If this section uses the alignment of its input sections. */
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unsigned int align_lma_with_input : 1;
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} lang_output_section_statement_type;
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typedef struct
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{
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lang_statement_header_type header;
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fill_type *fill;
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int size;
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asection *output_section;
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} lang_fill_statement_type;
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typedef struct
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{
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lang_statement_header_type header;
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unsigned int type;
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union etree_union *exp;
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bfd_vma value;
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asection *output_section;
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bfd_vma output_offset;
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} lang_data_statement_type;
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/* Generate a reloc in the output file. */
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typedef struct
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{
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lang_statement_header_type header;
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/* Reloc to generate. */
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bfd_reloc_code_real_type reloc;
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/* Reloc howto structure. */
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reloc_howto_type *howto;
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/* Section to generate reloc against.
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Exactly one of section and name must be NULL. */
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asection *section;
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/* Name of symbol to generate reloc against.
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Exactly one of section and name must be NULL. */
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const char *name;
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/* Expression for addend. */
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union etree_union *addend_exp;
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/* Resolved addend. */
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bfd_vma addend_value;
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/* Output section where reloc should be performed. */
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asection *output_section;
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/* Offset within output section. */
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bfd_vma output_offset;
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} lang_reloc_statement_type;
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struct lang_input_statement_flags
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{
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/* 1 means this file was specified in a -l option. */
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unsigned int maybe_archive : 1;
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/* 1 means this file was specified in a -l:namespec option. */
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unsigned int full_name_provided : 1;
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/* 1 means search a set of directories for this file. */
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unsigned int search_dirs : 1;
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/* 1 means this was found when processing a script in the sysroot. */
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unsigned int sysrooted : 1;
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/* 1 means this is base file of incremental load.
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Do not load this file's text or data.
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Also default text_start to after this file's bss. */
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unsigned int just_syms : 1;
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/* Whether to search for this entry as a dynamic archive. */
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unsigned int dynamic : 1;
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/* Set if a DT_NEEDED tag should be added not just for the dynamic library
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explicitly given by this entry but also for any dynamic libraries in
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this entry's needed list. */
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unsigned int add_DT_NEEDED_for_dynamic : 1;
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/* Set if this entry should cause a DT_NEEDED tag only when some
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regular file references its symbols (ie. --as-needed is in effect). */
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unsigned int add_DT_NEEDED_for_regular : 1;
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/* Whether to include the entire contents of an archive. */
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unsigned int whole_archive : 1;
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/* Set when bfd opening is successful. */
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unsigned int loaded : 1;
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unsigned int real : 1;
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/* Set if the file does not exist. */
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unsigned int missing_file : 1;
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/* Set if reloading an archive or --as-needed lib. */
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unsigned int reload : 1;
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#ifdef ENABLE_PLUGINS
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/* Set if the file was claimed by a plugin. */
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unsigned int claimed : 1;
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/* Set if the file was claimed from an archive. */
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unsigned int claim_archive : 1;
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/* Set if added by the lto plugin add_input_file callback. */
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unsigned int lto_output : 1;
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#endif /* ENABLE_PLUGINS */
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/* Head of list of pushed flags. */
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struct lang_input_statement_flags *pushed;
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};
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typedef struct lang_input_statement_struct
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{
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lang_statement_header_type header;
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/* Name of this file. */
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const char *filename;
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/* Name to use for the symbol giving address of text start.
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Usually the same as filename, but for a file spec'd with
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-l this is the -l switch itself rather than the filename. */
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const char *local_sym_name;
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bfd *the_bfd;
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ctf_archive_t *the_ctf;
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struct flag_info *section_flag_list;
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/* Next pointer for file_chain statement list. */
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struct lang_input_statement_struct *next;
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/* Next pointer for input_file_chain statement list. */
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struct lang_input_statement_struct *next_real_file;
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const char *target;
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struct lang_input_statement_flags flags;
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} lang_input_statement_type;
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typedef struct
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{
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lang_statement_header_type header;
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asection *section;
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} lang_input_section_type;
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struct map_symbol_def {
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struct bfd_link_hash_entry *entry;
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struct map_symbol_def *next;
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};
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/* For input sections, when writing a map file: head / tail of a linked
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list of hash table entries for symbols defined in this section. */
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typedef struct input_section_userdata_struct
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{
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struct map_symbol_def *map_symbol_def_head;
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struct map_symbol_def **map_symbol_def_tail;
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unsigned long map_symbol_def_count;
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} input_section_userdata_type;
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static inline bfd_boolean
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bfd_input_just_syms (const bfd *abfd)
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{
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lang_input_statement_type *is = bfd_usrdata (abfd);
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return is != NULL && is->flags.just_syms;
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}
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typedef struct lang_wild_statement_struct lang_wild_statement_type;
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typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *,
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asection *, struct flag_info *,
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lang_input_statement_type *, void *);
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typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *,
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lang_input_statement_type *,
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callback_t callback,
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void *data);
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typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *,
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bfd *, const asection *);
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/* Binary search tree structure to efficiently sort sections by
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name. */
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typedef struct lang_section_bst
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{
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asection *section;
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struct lang_section_bst *left;
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struct lang_section_bst *right;
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} lang_section_bst_type;
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struct lang_wild_statement_struct
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{
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lang_statement_header_type header;
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const char *filename;
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bfd_boolean filenames_sorted;
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struct wildcard_list *section_list;
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bfd_boolean keep_sections;
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lang_statement_list_type children;
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struct name_list *exclude_name_list;
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walk_wild_section_handler_t walk_wild_section_handler;
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struct wildcard_list *handler_data[4];
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lang_section_bst_type *tree;
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struct flag_info *section_flag_list;
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};
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typedef struct lang_address_statement_struct
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{
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lang_statement_header_type header;
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const char *section_name;
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union etree_union *address;
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const segment_type *segment;
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} lang_address_statement_type;
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typedef struct
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{
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lang_statement_header_type header;
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bfd_vma output_offset;
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bfd_size_type size;
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asection *output_section;
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fill_type *fill;
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} lang_padding_statement_type;
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/* A group statement collects a set of libraries together. The
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libraries are searched multiple times, until no new undefined
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symbols are found. The effect is to search a group of libraries as
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though they were a single library. */
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typedef struct
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{
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lang_statement_header_type header;
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lang_statement_list_type children;
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} lang_group_statement_type;
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typedef struct
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{
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lang_statement_header_type header;
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const char *where;
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bfd_boolean is_before;
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} lang_insert_statement_type;
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typedef union lang_statement_union
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{
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lang_statement_header_type header;
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lang_address_statement_type address_statement;
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lang_assignment_statement_type assignment_statement;
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lang_data_statement_type data_statement;
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lang_fill_statement_type fill_statement;
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lang_group_statement_type group_statement;
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lang_input_section_type input_section;
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lang_input_statement_type input_statement;
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lang_insert_statement_type insert_statement;
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lang_output_section_statement_type output_section_statement;
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lang_output_statement_type output_statement;
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lang_padding_statement_type padding_statement;
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lang_reloc_statement_type reloc_statement;
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lang_target_statement_type target_statement;
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lang_wild_statement_type wild_statement;
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} lang_statement_union_type;
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/* This structure holds information about a program header, from the
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PHDRS command in the linker script. */
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struct lang_phdr
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{
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struct lang_phdr *next;
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const char *name;
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unsigned long type;
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bfd_boolean filehdr;
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bfd_boolean phdrs;
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etree_type *at;
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etree_type *flags;
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};
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/* This structure is used to hold a list of sections which may not
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cross reference each other. */
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typedef struct lang_nocrossref
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{
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struct lang_nocrossref *next;
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const char *name;
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} lang_nocrossref_type;
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/* The list of nocrossref lists. */
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struct lang_nocrossrefs
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{
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struct lang_nocrossrefs *next;
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lang_nocrossref_type *list;
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bfd_boolean onlyfirst;
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};
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/* This structure is used to hold a list of input section names which
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will not match an output section in the linker script. */
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struct unique_sections
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{
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struct unique_sections *next;
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const char *name;
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};
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/* Used by place_orphan to keep track of orphan sections and statements. */
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struct orphan_save
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{
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const char *name;
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flagword flags;
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lang_output_section_statement_type *os;
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asection **section;
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lang_statement_union_type **stmt;
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lang_output_section_statement_type **os_tail;
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};
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struct asneeded_minfo
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{
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struct asneeded_minfo *next;
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const char *soname;
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bfd *ref;
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const char *name;
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};
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extern struct lang_phdr *lang_phdr_list;
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extern struct lang_nocrossrefs *nocrossref_list;
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extern const char *output_target;
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extern lang_output_section_statement_type *abs_output_section;
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extern lang_statement_list_type lang_os_list;
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extern struct lang_input_statement_flags input_flags;
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extern bfd_boolean lang_has_input_file;
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extern lang_statement_list_type *stat_ptr;
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extern bfd_boolean delete_output_file_on_failure;
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extern struct bfd_sym_chain entry_symbol;
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extern const char *entry_section;
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extern bfd_boolean entry_from_cmdline;
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extern lang_statement_list_type file_chain;
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extern lang_statement_list_type input_file_chain;
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extern int lang_statement_iteration;
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extern struct asneeded_minfo **asneeded_list_tail;
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extern void (*output_bfd_hash_table_free_fn) (struct bfd_link_hash_table *);
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extern void lang_init
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(void);
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extern void lang_finish
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(void);
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extern lang_memory_region_type * lang_memory_region_lookup
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(const char * const, bfd_boolean);
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extern void lang_memory_region_alias
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(const char *, const char *);
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extern void lang_map
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(void);
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extern void lang_set_flags
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(lang_memory_region_type *, const char *, int);
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extern void lang_add_output
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(const char *, int from_script);
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extern lang_output_section_statement_type *lang_enter_output_section_statement
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(const char *, etree_type *, enum section_type, etree_type *, etree_type *,
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etree_type *, int, int);
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extern void lang_final
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(void);
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extern void lang_relax_sections
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(bfd_boolean);
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extern void lang_process
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(void);
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extern void lang_section_start
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(const char *, union etree_union *, const segment_type *);
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extern void lang_add_entry
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(const char *, bfd_boolean);
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extern void lang_default_entry
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(const char *);
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extern void lang_add_target
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(const char *);
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extern void lang_add_wild
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(struct wildcard_spec *, struct wildcard_list *, bfd_boolean);
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extern void lang_add_map
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(const char *);
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extern void lang_add_fill
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(fill_type *);
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extern lang_assignment_statement_type *lang_add_assignment
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(union etree_union *);
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extern void lang_add_attribute
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|
(enum statement_enum);
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extern void lang_startup
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|
(const char *);
|
|
extern void lang_float
|
|
(bfd_boolean);
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extern void lang_leave_output_section_statement
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(fill_type *, const char *, lang_output_section_phdr_list *,
|
|
const char *);
|
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extern void lang_for_each_input_file
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|
(void (*dothis) (lang_input_statement_type *));
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extern void lang_for_each_file
|
|
(void (*dothis) (lang_input_statement_type *));
|
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extern void lang_reset_memory_regions
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|
(void);
|
|
extern void lang_do_assignments
|
|
(lang_phase_type);
|
|
extern asection *section_for_dot
|
|
(void);
|
|
|
|
#define LANG_FOR_EACH_INPUT_STATEMENT(statement) \
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lang_input_statement_type *statement; \
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for (statement = (lang_input_statement_type *) file_chain.head; \
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statement != NULL; \
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|
statement = statement->next)
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|
|
|
#define lang_output_section_find(NAME) \
|
|
lang_output_section_statement_lookup (NAME, 0, FALSE)
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|
|
|
extern void lang_process
|
|
(void);
|
|
extern void ldlang_add_file
|
|
(lang_input_statement_type *);
|
|
extern lang_output_section_statement_type *lang_output_section_find_by_flags
|
|
(const asection *, flagword, lang_output_section_statement_type **,
|
|
lang_match_sec_type_func);
|
|
extern lang_output_section_statement_type *lang_insert_orphan
|
|
(asection *, const char *, int, lang_output_section_statement_type *,
|
|
struct orphan_save *, etree_type *, lang_statement_list_type *);
|
|
extern lang_input_statement_type *lang_add_input_file
|
|
(const char *, lang_input_file_enum_type, const char *);
|
|
extern void lang_add_keepsyms_file
|
|
(const char *);
|
|
extern lang_output_section_statement_type *lang_output_section_get
|
|
(const asection *);
|
|
extern lang_output_section_statement_type *lang_output_section_statement_lookup
|
|
(const char *, int, bfd_boolean);
|
|
extern lang_output_section_statement_type *next_matching_output_section_statement
|
|
(lang_output_section_statement_type *, int);
|
|
extern void ldlang_add_undef
|
|
(const char *const, bfd_boolean);
|
|
extern void ldlang_add_require_defined
|
|
(const char *const);
|
|
extern void lang_add_output_format
|
|
(const char *, const char *, const char *, int);
|
|
extern void lang_list_init
|
|
(lang_statement_list_type *);
|
|
extern void push_stat_ptr
|
|
(lang_statement_list_type *);
|
|
extern void pop_stat_ptr
|
|
(void);
|
|
extern void lang_add_data
|
|
(int type, union etree_union *);
|
|
extern void lang_add_reloc
|
|
(bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
|
|
union etree_union *);
|
|
extern void lang_for_each_statement
|
|
(void (*) (lang_statement_union_type *));
|
|
extern void lang_for_each_statement_worker
|
|
(void (*) (lang_statement_union_type *), lang_statement_union_type *);
|
|
extern void *stat_alloc
|
|
(size_t);
|
|
extern void strip_excluded_output_sections
|
|
(void);
|
|
extern void lang_clear_os_map
|
|
(void);
|
|
extern void dprint_statement
|
|
(lang_statement_union_type *, int);
|
|
extern void lang_size_sections
|
|
(bfd_boolean *, bfd_boolean);
|
|
extern void one_lang_size_sections_pass
|
|
(bfd_boolean *, bfd_boolean);
|
|
extern void lang_add_insert
|
|
(const char *, int);
|
|
extern void lang_enter_group
|
|
(void);
|
|
extern void lang_leave_group
|
|
(void);
|
|
extern void lang_add_section
|
|
(lang_statement_list_type *, asection *,
|
|
struct flag_info *, lang_output_section_statement_type *);
|
|
extern void lang_new_phdr
|
|
(const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
|
|
etree_type *);
|
|
extern void lang_add_nocrossref
|
|
(lang_nocrossref_type *);
|
|
extern void lang_add_nocrossref_to
|
|
(lang_nocrossref_type *);
|
|
extern void lang_enter_overlay
|
|
(etree_type *, etree_type *);
|
|
extern void lang_enter_overlay_section
|
|
(const char *);
|
|
extern void lang_leave_overlay_section
|
|
(fill_type *, lang_output_section_phdr_list *);
|
|
extern void lang_leave_overlay
|
|
(etree_type *, int, fill_type *, const char *,
|
|
lang_output_section_phdr_list *, const char *);
|
|
|
|
extern struct bfd_elf_version_expr *lang_new_vers_pattern
|
|
(struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean);
|
|
extern struct bfd_elf_version_tree *lang_new_vers_node
|
|
(struct bfd_elf_version_expr *, struct bfd_elf_version_expr *);
|
|
extern struct bfd_elf_version_deps *lang_add_vers_depend
|
|
(struct bfd_elf_version_deps *, const char *);
|
|
extern void lang_register_vers_node
|
|
(const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *);
|
|
extern void lang_append_dynamic_list (struct bfd_elf_version_expr *);
|
|
extern void lang_append_dynamic_list_cpp_typeinfo (void);
|
|
extern void lang_append_dynamic_list_cpp_new (void);
|
|
extern void lang_add_unique
|
|
(const char *);
|
|
extern const char *lang_get_output_target
|
|
(void);
|
|
extern void add_excluded_libs (const char *);
|
|
extern bfd_boolean load_symbols
|
|
(lang_input_statement_type *, lang_statement_list_type *);
|
|
|
|
struct elf_sym_strtab;
|
|
struct elf_strtab_hash;
|
|
extern void ldlang_ctf_apply_strsym
|
|
(struct elf_sym_strtab *, bfd_size_type, struct elf_strtab_hash *);
|
|
extern void ldlang_write_ctf_late
|
|
(void);
|
|
extern bfd_boolean
|
|
ldlang_override_segment_assignment
|
|
(struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean);
|
|
|
|
extern void
|
|
lang_ld_feature (char *);
|
|
|
|
extern void
|
|
lang_print_memory_usage (void);
|
|
|
|
extern void
|
|
lang_add_gc_name (const char *);
|
|
|
|
#endif
|