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/* bfdlink.h -- header file for BFD link routines |
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Copyright (C) 1993-2014 Free Software Foundation, Inc. |
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Written by Steve Chamberlain and Ian Lance Taylor, 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 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 BFDLINK_H |
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#define BFDLINK_H |
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/* Which symbols to strip during a link. */ |
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enum bfd_link_strip |
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{ |
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strip_none, /* Don't strip any symbols. */ |
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strip_debugger, /* Strip debugging symbols. */ |
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strip_some, /* keep_hash is the list of symbols to keep. */ |
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strip_all /* Strip all symbols. */ |
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}; |
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/* Which local symbols to discard during a link. This is irrelevant |
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if strip_all is used. */ |
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enum bfd_link_discard |
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{ |
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discard_sec_merge, /* Discard local temporary symbols in SEC_MERGE |
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sections. */ |
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discard_none, /* Don't discard any locals. */ |
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discard_l, /* Discard local temporary symbols. */ |
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discard_all /* Discard all locals. */ |
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}; |
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/* Describes the type of hash table entry structure being used. |
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Different hash table structure have different fields and so |
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support different linking features. */ |
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enum bfd_link_hash_table_type |
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{ |
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bfd_link_generic_hash_table, |
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bfd_link_elf_hash_table |
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}; |
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/* These are the possible types of an entry in the BFD link hash |
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table. */ |
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enum bfd_link_hash_type |
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{ |
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bfd_link_hash_new, /* Symbol is new. */ |
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bfd_link_hash_undefined, /* Symbol seen before, but undefined. */ |
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bfd_link_hash_undefweak, /* Symbol is weak and undefined. */ |
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bfd_link_hash_defined, /* Symbol is defined. */ |
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bfd_link_hash_defweak, /* Symbol is weak and defined. */ |
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bfd_link_hash_common, /* Symbol is common. */ |
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bfd_link_hash_indirect, /* Symbol is an indirect link. */ |
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bfd_link_hash_warning /* Like indirect, but warn if referenced. */ |
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}; |
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enum bfd_link_common_skip_ar_symbols |
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{ |
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bfd_link_common_skip_none, |
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bfd_link_common_skip_text, |
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bfd_link_common_skip_data, |
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bfd_link_common_skip_all |
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}; |
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struct bfd_link_hash_common_entry |
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{ |
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unsigned int alignment_power; /* Alignment. */ |
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asection *section; /* Symbol section. */ |
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}; |
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/* The linking routines use a hash table which uses this structure for |
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its elements. */ |
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struct bfd_link_hash_entry |
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{ |
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/* Base hash table entry structure. */ |
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struct bfd_hash_entry root; |
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/* Type of this entry. */ |
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ENUM_BITFIELD (bfd_link_hash_type) type : 8; |
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unsigned int non_ir_ref : 1; |
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/* A union of information depending upon the type. */ |
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union |
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{ |
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/* Nothing is kept for bfd_hash_new. */ |
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/* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ |
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struct |
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{ |
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/* Undefined and common symbols are kept in a linked list through |
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this field. This field is present in all of the union element |
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so that we don't need to remove entries from the list when we |
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change their type. Removing entries would either require the |
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list to be doubly linked, which would waste more memory, or |
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require a traversal. When an undefined or common symbol is |
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created, it should be added to this list, the head of which is in |
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the link hash table itself. As symbols are defined, they need |
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not be removed from the list; anything which reads the list must |
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doublecheck the symbol type. |
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Weak symbols are not kept on this list. |
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Defined and defweak symbols use this field as a reference marker. |
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If the field is not NULL, or this structure is the tail of the |
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undefined symbol list, the symbol has been referenced. If the |
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symbol is undefined and becomes defined, this field will |
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automatically be non-NULL since the symbol will have been on the |
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undefined symbol list. */ |
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struct bfd_link_hash_entry *next; |
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bfd *abfd; /* BFD symbol was found in. */ |
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} undef; |
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/* bfd_link_hash_defined, bfd_link_hash_defweak. */ |
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struct |
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{ |
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struct bfd_link_hash_entry *next; |
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asection *section; /* Symbol section. */ |
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bfd_vma value; /* Symbol value. */ |
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} def; |
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/* bfd_link_hash_indirect, bfd_link_hash_warning. */ |
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struct |
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{ |
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struct bfd_link_hash_entry *next; |
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struct bfd_link_hash_entry *link; /* Real symbol. */ |
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const char *warning; /* Warning (bfd_link_hash_warning only). */ |
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} i; |
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/* bfd_link_hash_common. */ |
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struct |
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{ |
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struct bfd_link_hash_entry *next; |
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/* The linker needs to know three things about common |
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symbols: the size, the alignment, and the section in |
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which the symbol should be placed. We store the size |
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here, and we allocate a small structure to hold the |
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section and the alignment. The alignment is stored as a |
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power of two. We don't store all the information |
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directly because we don't want to increase the size of |
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the union; this structure is a major space user in the |
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linker. */ |
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struct bfd_link_hash_common_entry *p; |
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bfd_size_type size; /* Common symbol size. */ |
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} c; |
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} u; |
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}; |
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/* This is the link hash table. It is a derived class of |
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bfd_hash_table. */ |
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struct bfd_link_hash_table |
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{ |
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/* The hash table itself. */ |
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struct bfd_hash_table table; |
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/* A linked list of undefined and common symbols, linked through the |
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next field in the bfd_link_hash_entry structure. */ |
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struct bfd_link_hash_entry *undefs; |
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/* Entries are added to the tail of the undefs list. */ |
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struct bfd_link_hash_entry *undefs_tail; |
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/* Function to free the hash table on closing BFD. */ |
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void (*hash_table_free) (bfd *); |
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/* The type of the link hash table. */ |
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enum bfd_link_hash_table_type type; |
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}; |
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/* Look up an entry in a link hash table. If FOLLOW is TRUE, this |
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follows bfd_link_hash_indirect and bfd_link_hash_warning links to |
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the real symbol. */ |
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extern struct bfd_link_hash_entry *bfd_link_hash_lookup |
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(struct bfd_link_hash_table *, const char *, bfd_boolean create, |
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bfd_boolean copy, bfd_boolean follow); |
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/* Look up an entry in the main linker hash table if the symbol might |
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be wrapped. This should only be used for references to an |
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undefined symbol, not for definitions of a symbol. */ |
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extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup |
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(bfd *, struct bfd_link_info *, const char *, bfd_boolean, |
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bfd_boolean, bfd_boolean); |
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/* If H is a wrapped symbol, ie. the symbol name starts with "__wrap_" |
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and the remainder is found in wrap_hash, return the real symbol. */ |
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extern struct bfd_link_hash_entry *unwrap_hash_lookup |
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(struct bfd_link_info *, bfd *, struct bfd_link_hash_entry *); |
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/* Traverse a link hash table. */ |
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extern void bfd_link_hash_traverse |
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(struct bfd_link_hash_table *, |
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bfd_boolean (*) (struct bfd_link_hash_entry *, void *), |
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void *); |
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/* Add an entry to the undefs list. */ |
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extern void bfd_link_add_undef |
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(struct bfd_link_hash_table *, struct bfd_link_hash_entry *); |
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/* Remove symbols from the undefs list that don't belong there. */ |
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extern void bfd_link_repair_undef_list |
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(struct bfd_link_hash_table *table); |
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/* Read symbols and cache symbol pointer array in outsymbols. */ |
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extern bfd_boolean bfd_generic_link_read_symbols (bfd *); |
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struct bfd_sym_chain |
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{ |
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struct bfd_sym_chain *next; |
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const char *name; |
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}; |
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/* How to handle unresolved symbols. |
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There are four possibilities which are enumerated below: */ |
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enum report_method |
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{ |
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/* This is the initial value when then link_info structure is created. |
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It allows the various stages of the linker to determine whether they |
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allowed to set the value. */ |
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RM_NOT_YET_SET = 0, |
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RM_IGNORE, |
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RM_GENERATE_WARNING, |
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RM_GENERATE_ERROR |
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}; |
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typedef enum {with_flags, without_flags} flag_type; |
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/* A section flag list. */ |
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struct flag_info_list |
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{ |
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flag_type with; |
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const char *name; |
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bfd_boolean valid; |
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struct flag_info_list *next; |
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}; |
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/* Section flag info. */ |
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struct flag_info |
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{ |
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flagword only_with_flags; |
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flagword not_with_flags; |
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struct flag_info_list *flag_list; |
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bfd_boolean flags_initialized; |
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}; |
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struct bfd_elf_dynamic_list; |
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struct bfd_elf_version_tree; |
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/* This structure holds all the information needed to communicate |
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between BFD and the linker when doing a link. */ |
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struct bfd_link_info |
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{ |
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/* TRUE if BFD should generate a shared object (or a pie). */ |
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unsigned int shared: 1; |
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/* TRUE if generating an executable, position independent or not. */ |
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unsigned int executable : 1; |
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/* TRUE if generating a position independent executable. */ |
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unsigned int pie: 1; |
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/* TRUE if BFD should generate a relocatable object file. */ |
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unsigned int relocatable: 1; |
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/* TRUE if BFD should pre-bind symbols in a shared object. */ |
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unsigned int symbolic: 1; |
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/* TRUE if executable should not contain copy relocs. |
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Setting this true may result in a non-sharable text segment. */ |
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unsigned int nocopyreloc: 1; |
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/* TRUE if BFD should export all symbols in the dynamic symbol table |
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of an executable, rather than only those used. */ |
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unsigned int export_dynamic: 1; |
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/* TRUE if a default symbol version should be created and used for |
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exported symbols. */ |
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unsigned int create_default_symver: 1; |
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/* TRUE if unreferenced sections should be removed. */ |
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unsigned int gc_sections: 1; |
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/* TRUE if every symbol should be reported back via the notice |
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callback. */ |
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unsigned int notice_all: 1; |
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/* TRUE if the LTO plugin is active. */ |
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unsigned int lto_plugin_active: 1; |
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/* TRUE if we are loading LTO outputs. */ |
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unsigned int loading_lto_outputs: 1; |
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/* TRUE if global symbols in discarded sections should be stripped. */ |
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unsigned int strip_discarded: 1; |
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/* TRUE if all data symbols should be dynamic. */ |
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unsigned int dynamic_data: 1; |
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/* Which symbols to strip. */ |
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ENUM_BITFIELD (bfd_link_strip) strip : 2; |
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/* Which local symbols to discard. */ |
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ENUM_BITFIELD (bfd_link_discard) discard : 2; |
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/* Criteria for skipping symbols when determining |
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whether to include an object from an archive. */ |
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ENUM_BITFIELD (bfd_link_common_skip_ar_symbols) common_skip_ar_symbols : 2; |
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/* What to do with unresolved symbols in an object file. |
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When producing executables the default is GENERATE_ERROR. |
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When producing shared libraries the default is IGNORE. The |
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assumption with shared libraries is that the reference will be |
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resolved at load/execution time. */ |
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ENUM_BITFIELD (report_method) unresolved_syms_in_objects : 2; |
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/* What to do with unresolved symbols in a shared library. |
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The same defaults apply. */ |
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ENUM_BITFIELD (report_method) unresolved_syms_in_shared_libs : 2; |
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/* TRUE if shared objects should be linked directly, not shared. */ |
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unsigned int static_link: 1; |
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/* TRUE if symbols should be retained in memory, FALSE if they |
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should be freed and reread. */ |
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unsigned int keep_memory: 1; |
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/* TRUE if BFD should generate relocation information in the final |
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executable. */ |
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unsigned int emitrelocations: 1; |
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/* TRUE if PT_GNU_RELRO segment should be created. */ |
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unsigned int relro: 1; |
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/* TRUE if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment |
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should be created. */ |
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unsigned int eh_frame_hdr: 1; |
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/* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */ |
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unsigned int warn_shared_textrel: 1; |
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/* TRUE if we should error when adding a DT_TEXTREL. */ |
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unsigned int error_textrel: 1; |
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/* TRUE if .hash section should be created. */ |
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unsigned int emit_hash: 1; |
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/* TRUE if .gnu.hash section should be created. */ |
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unsigned int emit_gnu_hash: 1; |
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/* If TRUE reduce memory overheads, at the expense of speed. This will |
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cause map file generation to use an O(N^2) algorithm and disable |
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caching ELF symbol buffer. */ |
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unsigned int reduce_memory_overheads: 1; |
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/* TRUE if the output file should be in a traditional format. This |
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is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag |
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on the output file, but may be checked when reading the input |
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files. */ |
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unsigned int traditional_format: 1; |
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/* TRUE if non-PLT relocs should be merged into one reloc section |
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and sorted so that relocs against the same symbol come together. */ |
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unsigned int combreloc: 1; |
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/* TRUE if a default symbol version should be created and used for |
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imported symbols. */ |
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unsigned int default_imported_symver: 1; |
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/* TRUE if the new ELF dynamic tags are enabled. */ |
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unsigned int new_dtags: 1; |
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/* FALSE if .eh_frame unwind info should be generated for PLT and other |
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linker created sections, TRUE if it should be omitted. */ |
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unsigned int no_ld_generated_unwind_info: 1; |
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/* TRUE if BFD should generate a "task linked" object file, |
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similar to relocatable but also with globals converted to |
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statics. */ |
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unsigned int task_link: 1; |
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/* TRUE if ok to have multiple definition. */ |
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unsigned int allow_multiple_definition: 1; |
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/* TRUE if ok to have version with no definition. */ |
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unsigned int allow_undefined_version: 1; |
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/* TRUE if some symbols have to be dynamic, controlled by |
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--dynamic-list command line options. */ |
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unsigned int dynamic: 1; |
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/* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X |
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flags. */ |
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unsigned int execstack: 1; |
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/* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W |
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flags. */ |
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unsigned int noexecstack: 1; |
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/* TRUE if we want to produced optimized output files. This might |
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need much more time and therefore must be explicitly selected. */ |
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unsigned int optimize: 1; |
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/* TRUE if user should be informed of removed unreferenced sections. */ |
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unsigned int print_gc_sections: 1; |
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/* TRUE if we should warn alternate ELF machine code. */ |
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unsigned int warn_alternate_em: 1; |
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/* TRUE if the linker script contained an explicit PHDRS command. */ |
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unsigned int user_phdrs: 1; |
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/* Char that may appear as the first char of a symbol, but should be |
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skipped (like symbol_leading_char) when looking up symbols in |
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wrap_hash. Used by PowerPC Linux for 'dot' symbols. */ |
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char wrap_char; |
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/* Separator between archive and filename in linker script filespecs. */ |
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char path_separator; |
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/* Default stack size. Zero means default (often zero itself), -1 |
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means explicitly zero-sized. */ |
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bfd_signed_vma stacksize; |
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/* Enable or disable target specific optimizations. |
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Not all targets have optimizations to enable. |
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Normally these optimizations are disabled by default but some targets |
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prefer to enable them by default. So this field is a tri-state variable. |
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The values are: |
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zero: Enable the optimizations (either from --relax being specified on |
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the command line or the backend's before_allocation emulation function. |
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positive: The user has requested that these optimizations be disabled. |
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(Via the --no-relax command line option). |
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negative: The optimizations are disabled. (Set when initializing the |
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args_type structure in ldmain.c:main. */ |
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signed int disable_target_specific_optimizations; |
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/* Function callbacks. */ |
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const struct bfd_link_callbacks *callbacks; |
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/* Hash table handled by BFD. */ |
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struct bfd_link_hash_table *hash; |
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/* Hash table of symbols to keep. This is NULL unless strip is |
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strip_some. */ |
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struct bfd_hash_table *keep_hash; |
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/* Hash table of symbols to report back via the notice callback. If |
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this is NULL, and notice_all is FALSE, then no symbols are |
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reported back. */ |
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struct bfd_hash_table *notice_hash; |
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/* Hash table of symbols which are being wrapped (the --wrap linker |
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option). If this is NULL, no symbols are being wrapped. */ |
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struct bfd_hash_table *wrap_hash; |
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/* Hash table of symbols which may be left unresolved during |
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a link. If this is NULL, no symbols can be left unresolved. */ |
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struct bfd_hash_table *ignore_hash; |
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|
|
|
/* The output BFD. */ |
|
|
bfd *output_bfd; |
|
|
|
|
|
/* The list of input BFD's involved in the link. These are chained |
|
|
together via the link.next field. */ |
|
|
bfd *input_bfds; |
|
|
bfd **input_bfds_tail; |
|
|
|
|
|
/* If a symbol should be created for each input BFD, this is section |
|
|
where those symbols should be placed. It must be a section in |
|
|
the output BFD. It may be NULL, in which case no such symbols |
|
|
will be created. This is to support CREATE_OBJECT_SYMBOLS in the |
|
|
linker command language. */ |
|
|
asection *create_object_symbols_section; |
|
|
|
|
|
/* List of global symbol names that are starting points for marking |
|
|
sections against garbage collection. */ |
|
|
struct bfd_sym_chain *gc_sym_list; |
|
|
|
|
|
/* If a base output file is wanted, then this points to it */ |
|
|
void *base_file; |
|
|
|
|
|
/* The function to call when the executable or shared object is |
|
|
loaded. */ |
|
|
const char *init_function; |
|
|
|
|
|
/* The function to call when the executable or shared object is |
|
|
unloaded. */ |
|
|
const char *fini_function; |
|
|
|
|
|
/* Number of relaxation passes. Usually only one relaxation pass |
|
|
is needed. But a backend can have as many relaxation passes as |
|
|
necessary. During bfd_relax_section call, it is set to the |
|
|
current pass, starting from 0. */ |
|
|
int relax_pass; |
|
|
|
|
|
/* Number of relaxation trips. This number is incremented every |
|
|
time the relaxation pass is restarted due to a previous |
|
|
relaxation returning true in *AGAIN. */ |
|
|
int relax_trip; |
|
|
|
|
|
/* Non-zero if auto-import thunks for DATA items in pei386 DLLs |
|
|
should be generated/linked against. Set to 1 if this feature |
|
|
is explicitly requested by the user, -1 if enabled by default. */ |
|
|
int pei386_auto_import; |
|
|
|
|
|
/* Non-zero if runtime relocs for DATA items with non-zero addends |
|
|
in pei386 DLLs should be generated. Set to 1 if this feature |
|
|
is explicitly requested by the user, -1 if enabled by default. */ |
|
|
int pei386_runtime_pseudo_reloc; |
|
|
|
|
|
/* How many spare .dynamic DT_NULL entries should be added? */ |
|
|
unsigned int spare_dynamic_tags; |
|
|
|
|
|
/* May be used to set DT_FLAGS for ELF. */ |
|
|
bfd_vma flags; |
|
|
|
|
|
/* May be used to set DT_FLAGS_1 for ELF. */ |
|
|
bfd_vma flags_1; |
|
|
|
|
|
/* Start and end of RELRO region. */ |
|
|
bfd_vma relro_start, relro_end; |
|
|
|
|
|
/* List of symbols should be dynamic. */ |
|
|
struct bfd_elf_dynamic_list *dynamic_list; |
|
|
|
|
|
/* The version information. */ |
|
|
struct bfd_elf_version_tree *version_info; |
|
|
}; |
|
|
|
|
|
/* This structures holds a set of callback functions. These are called |
|
|
by the BFD linker routines. Except for the info functions, the first |
|
|
argument to each callback function is the bfd_link_info structure |
|
|
being used and each function returns a boolean value. If the |
|
|
function returns FALSE, then the BFD function which called it should |
|
|
return with a failure indication. */ |
|
|
|
|
|
struct bfd_link_callbacks |
|
|
{ |
|
|
/* A function which is called when an object is added from an |
|
|
archive. ABFD is the archive element being added. NAME is the |
|
|
name of the symbol which caused the archive element to be pulled |
|
|
in. This function may set *SUBSBFD to point to an alternative |
|
|
BFD from which symbols should in fact be added in place of the |
|
|
original BFD's symbols. */ |
|
|
bfd_boolean (*add_archive_element) |
|
|
(struct bfd_link_info *, bfd *abfd, const char *name, bfd **subsbfd); |
|
|
/* A function which is called when a symbol is found with multiple |
|
|
definitions. H is the symbol which is defined multiple times. |
|
|
NBFD is the new BFD, NSEC is the new section, and NVAL is the new |
|
|
value. NSEC may be bfd_com_section or bfd_ind_section. */ |
|
|
bfd_boolean (*multiple_definition) |
|
|
(struct bfd_link_info *, struct bfd_link_hash_entry *h, |
|
|
bfd *nbfd, asection *nsec, bfd_vma nval); |
|
|
/* A function which is called when a common symbol is defined |
|
|
multiple times. H is the symbol appearing multiple times. |
|
|
NBFD is the BFD of the new symbol. NTYPE is the type of the new |
|
|
symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or |
|
|
bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE |
|
|
is the size of the new symbol. */ |
|
|
bfd_boolean (*multiple_common) |
|
|
(struct bfd_link_info *, struct bfd_link_hash_entry *h, |
|
|
bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize); |
|
|
/* A function which is called to add a symbol to a set. ENTRY is |
|
|
the link hash table entry for the set itself (e.g., |
|
|
__CTOR_LIST__). RELOC is the relocation to use for an entry in |
|
|
the set when generating a relocatable file, and is also used to |
|
|
get the size of the entry when generating an executable file. |
|
|
ABFD, SEC and VALUE identify the value to add to the set. */ |
|
|
bfd_boolean (*add_to_set) |
|
|
(struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
|
|
bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value); |
|
|
/* A function which is called when the name of a g++ constructor or |
|
|
destructor is found. This is only called by some object file |
|
|
formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a |
|
|
destructor. This will use BFD_RELOC_CTOR when generating a |
|
|
relocatable file. NAME is the name of the symbol found. ABFD, |
|
|
SECTION and VALUE are the value of the symbol. */ |
|
|
bfd_boolean (*constructor) |
|
|
(struct bfd_link_info *, bfd_boolean constructor, const char *name, |
|
|
bfd *abfd, asection *sec, bfd_vma value); |
|
|
/* A function which is called to issue a linker warning. For |
|
|
example, this is called when there is a reference to a warning |
|
|
symbol. WARNING is the warning to be issued. SYMBOL is the name |
|
|
of the symbol which triggered the warning; it may be NULL if |
|
|
there is none. ABFD, SECTION and ADDRESS identify the location |
|
|
which trigerred the warning; either ABFD or SECTION or both may |
|
|
be NULL if the location is not known. */ |
|
|
bfd_boolean (*warning) |
|
|
(struct bfd_link_info *, const char *warning, const char *symbol, |
|
|
bfd *abfd, asection *section, bfd_vma address); |
|
|
/* A function which is called when a relocation is attempted against |
|
|
an undefined symbol. NAME is the symbol which is undefined. |
|
|
ABFD, SECTION and ADDRESS identify the location from which the |
|
|
reference is made. IS_FATAL indicates whether an undefined symbol is |
|
|
a fatal error or not. In some cases SECTION may be NULL. */ |
|
|
bfd_boolean (*undefined_symbol) |
|
|
(struct bfd_link_info *, const char *name, bfd *abfd, |
|
|
asection *section, bfd_vma address, bfd_boolean is_fatal); |
|
|
/* A function which is called when a reloc overflow occurs. ENTRY is |
|
|
the link hash table entry for the symbol the reloc is against. |
|
|
NAME is the name of the local symbol or section the reloc is |
|
|
against, RELOC_NAME is the name of the relocation, and ADDEND is |
|
|
any addend that is used. ABFD, SECTION and ADDRESS identify the |
|
|
location at which the overflow occurs; if this is the result of a |
|
|
bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
|
|
ABFD will be NULL. */ |
|
|
bfd_boolean (*reloc_overflow) |
|
|
(struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
|
|
const char *name, const char *reloc_name, bfd_vma addend, |
|
|
bfd *abfd, asection *section, bfd_vma address); |
|
|
/* A function which is called when a dangerous reloc is performed. |
|
|
MESSAGE is an appropriate message. |
|
|
ABFD, SECTION and ADDRESS identify the location at which the |
|
|
problem occurred; if this is the result of a |
|
|
bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
|
|
ABFD will be NULL. */ |
|
|
bfd_boolean (*reloc_dangerous) |
|
|
(struct bfd_link_info *, const char *message, |
|
|
bfd *abfd, asection *section, bfd_vma address); |
|
|
/* A function which is called when a reloc is found to be attached |
|
|
to a symbol which is not being written out. NAME is the name of |
|
|
the symbol. ABFD, SECTION and ADDRESS identify the location of |
|
|
the reloc; if this is the result of a |
|
|
bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
|
|
ABFD will be NULL. */ |
|
|
bfd_boolean (*unattached_reloc) |
|
|
(struct bfd_link_info *, const char *name, |
|
|
bfd *abfd, asection *section, bfd_vma address); |
|
|
/* A function which is called when a symbol in notice_hash is |
|
|
defined or referenced. H is the symbol, INH the indirect symbol |
|
|
if applicable. ABFD, SECTION and ADDRESS are the (new) value of |
|
|
the symbol. If SECTION is bfd_und_section, this is a reference. |
|
|
FLAGS are the symbol BSF_* flags. */ |
|
|
bfd_boolean (*notice) |
|
|
(struct bfd_link_info *, struct bfd_link_hash_entry *h, |
|
|
struct bfd_link_hash_entry *inh, |
|
|
bfd *abfd, asection *section, bfd_vma address, flagword flags); |
|
|
/* Error or warning link info message. */ |
|
|
void (*einfo) |
|
|
(const char *fmt, ...); |
|
|
/* General link info message. */ |
|
|
void (*info) |
|
|
(const char *fmt, ...); |
|
|
/* Message to be printed in linker map file. */ |
|
|
void (*minfo) |
|
|
(const char *fmt, ...); |
|
|
/* This callback provides a chance for users of the BFD library to |
|
|
override its decision about whether to place two adjacent sections |
|
|
into the same segment. */ |
|
|
bfd_boolean (*override_segment_assignment) |
|
|
(struct bfd_link_info *, bfd * abfd, |
|
|
asection * current_section, asection * previous_section, |
|
|
bfd_boolean new_segment); |
|
|
}; |
|
|
|
|
|
/* The linker builds link_order structures which tell the code how to |
|
|
include input data in the output file. */ |
|
|
|
|
|
/* These are the types of link_order structures. */ |
|
|
|
|
|
enum bfd_link_order_type |
|
|
{ |
|
|
bfd_undefined_link_order, /* Undefined. */ |
|
|
bfd_indirect_link_order, /* Built from a section. */ |
|
|
bfd_data_link_order, /* Set to explicit data. */ |
|
|
bfd_section_reloc_link_order, /* Relocate against a section. */ |
|
|
bfd_symbol_reloc_link_order /* Relocate against a symbol. */ |
|
|
}; |
|
|
|
|
|
/* This is the link_order structure itself. These form a chain |
|
|
attached to the output section whose contents they are describing. */ |
|
|
|
|
|
struct bfd_link_order |
|
|
{ |
|
|
/* Next link_order in chain. */ |
|
|
struct bfd_link_order *next; |
|
|
/* Type of link_order. */ |
|
|
enum bfd_link_order_type type; |
|
|
/* Offset within output section. */ |
|
|
bfd_vma offset; |
|
|
/* Size within output section. */ |
|
|
bfd_size_type size; |
|
|
/* Type specific information. */ |
|
|
union |
|
|
{ |
|
|
struct |
|
|
{ |
|
|
/* Section to include. If this is used, then |
|
|
section->output_section must be the section the |
|
|
link_order is attached to, section->output_offset must |
|
|
equal the link_order offset field, and section->size |
|
|
must equal the link_order size field. Maybe these |
|
|
restrictions should be relaxed someday. */ |
|
|
asection *section; |
|
|
} indirect; |
|
|
struct |
|
|
{ |
|
|
/* Size of contents, or zero when contents should be filled by |
|
|
the architecture-dependent fill function. |
|
|
A non-zero value allows filling of the output section |
|
|
with an arbitrary repeated pattern. */ |
|
|
unsigned int size; |
|
|
/* Data to put into file. */ |
|
|
bfd_byte *contents; |
|
|
} data; |
|
|
struct |
|
|
{ |
|
|
/* Description of reloc to generate. Used for |
|
|
bfd_section_reloc_link_order and |
|
|
bfd_symbol_reloc_link_order. */ |
|
|
struct bfd_link_order_reloc *p; |
|
|
} reloc; |
|
|
} u; |
|
|
}; |
|
|
|
|
|
/* A linker order of type bfd_section_reloc_link_order or |
|
|
bfd_symbol_reloc_link_order means to create a reloc against a |
|
|
section or symbol, respectively. This is used to implement -Ur to |
|
|
generate relocs for the constructor tables. The |
|
|
bfd_link_order_reloc structure describes the reloc that BFD should |
|
|
create. It is similar to a arelent, but I didn't use arelent |
|
|
because the linker does not know anything about most symbols, and |
|
|
any asymbol structure it creates will be partially meaningless. |
|
|
This information could logically be in the bfd_link_order struct, |
|
|
but I didn't want to waste the space since these types of relocs |
|
|
are relatively rare. */ |
|
|
|
|
|
struct bfd_link_order_reloc |
|
|
{ |
|
|
/* Reloc type. */ |
|
|
bfd_reloc_code_real_type reloc; |
|
|
|
|
|
union |
|
|
{ |
|
|
/* For type bfd_section_reloc_link_order, this is the section |
|
|
the reloc should be against. This must be a section in the |
|
|
output BFD, not any of the input BFDs. */ |
|
|
asection *section; |
|
|
/* For type bfd_symbol_reloc_link_order, this is the name of the |
|
|
symbol the reloc should be against. */ |
|
|
const char *name; |
|
|
} u; |
|
|
|
|
|
/* Addend to use. The object file should contain zero. The BFD |
|
|
backend is responsible for filling in the contents of the object |
|
|
file correctly. For some object file formats (e.g., COFF) the |
|
|
addend must be stored into in the object file, and for some |
|
|
(e.g., SPARC a.out) it is kept in the reloc. */ |
|
|
bfd_vma addend; |
|
|
}; |
|
|
|
|
|
/* Allocate a new link_order for a section. */ |
|
|
extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); |
|
|
|
|
|
/* These structures are used to describe version information for the |
|
|
ELF linker. These structures could be manipulated entirely inside |
|
|
BFD, but it would be a pain. Instead, the regular linker sets up |
|
|
these structures, and then passes them into BFD. */ |
|
|
|
|
|
/* Glob pattern for a version. */ |
|
|
|
|
|
struct bfd_elf_version_expr |
|
|
{ |
|
|
/* Next glob pattern for this version. */ |
|
|
struct bfd_elf_version_expr *next; |
|
|
/* Glob pattern. */ |
|
|
const char *pattern; |
|
|
/* Set if pattern is not a glob. */ |
|
|
unsigned int literal : 1; |
|
|
/* Defined by ".symver". */ |
|
|
unsigned int symver : 1; |
|
|
/* Defined by version script. */ |
|
|
unsigned int script : 1; |
|
|
/* Pattern type. */ |
|
|
#define BFD_ELF_VERSION_C_TYPE 1 |
|
|
#define BFD_ELF_VERSION_CXX_TYPE 2 |
|
|
#define BFD_ELF_VERSION_JAVA_TYPE 4 |
|
|
unsigned int mask : 3; |
|
|
}; |
|
|
|
|
|
struct bfd_elf_version_expr_head |
|
|
{ |
|
|
/* List of all patterns, both wildcards and non-wildcards. */ |
|
|
struct bfd_elf_version_expr *list; |
|
|
/* Hash table for non-wildcards. */ |
|
|
void *htab; |
|
|
/* Remaining patterns. */ |
|
|
struct bfd_elf_version_expr *remaining; |
|
|
/* What kind of pattern types are present in list (bitmask). */ |
|
|
unsigned int mask; |
|
|
}; |
|
|
|
|
|
/* Version dependencies. */ |
|
|
|
|
|
struct bfd_elf_version_deps |
|
|
{ |
|
|
/* Next dependency for this version. */ |
|
|
struct bfd_elf_version_deps *next; |
|
|
/* The version which this version depends upon. */ |
|
|
struct bfd_elf_version_tree *version_needed; |
|
|
}; |
|
|
|
|
|
/* A node in the version tree. */ |
|
|
|
|
|
struct bfd_elf_version_tree |
|
|
{ |
|
|
/* Next version. */ |
|
|
struct bfd_elf_version_tree *next; |
|
|
/* Name of this version. */ |
|
|
const char *name; |
|
|
/* Version number. */ |
|
|
unsigned int vernum; |
|
|
/* Regular expressions for global symbols in this version. */ |
|
|
struct bfd_elf_version_expr_head globals; |
|
|
/* Regular expressions for local symbols in this version. */ |
|
|
struct bfd_elf_version_expr_head locals; |
|
|
/* List of versions which this version depends upon. */ |
|
|
struct bfd_elf_version_deps *deps; |
|
|
/* Index of the version name. This is used within BFD. */ |
|
|
unsigned int name_indx; |
|
|
/* Whether this version tree was used. This is used within BFD. */ |
|
|
int used; |
|
|
/* Matching hook. */ |
|
|
struct bfd_elf_version_expr *(*match) |
|
|
(struct bfd_elf_version_expr_head *head, |
|
|
struct bfd_elf_version_expr *prev, const char *sym); |
|
|
}; |
|
|
|
|
|
struct bfd_elf_dynamic_list |
|
|
{ |
|
|
struct bfd_elf_version_expr_head head; |
|
|
struct bfd_elf_version_expr *(*match) |
|
|
(struct bfd_elf_version_expr_head *head, |
|
|
struct bfd_elf_version_expr *prev, const char *sym); |
|
|
}; |
|
|
|
|
|
#endif
|
|
|
|
