/* BFD COFF object file private structure. Copyright (C) 1990-2014 Free Software Foundation, Inc. Written by Cygnus Support. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "bfdlink.h" /* Object file tdata; access macros. */ #define coff_data(bfd) ((bfd)->tdata.coff_obj_data) #define obj_pe(bfd) (coff_data (bfd)->pe) #define obj_symbols(bfd) (coff_data (bfd)->symbols) #define obj_sym_filepos(bfd) (coff_data (bfd)->sym_filepos) #define obj_relocbase(bfd) (coff_data (bfd)->relocbase) #define obj_raw_syments(bfd) (coff_data (bfd)->raw_syments) #define obj_raw_syment_count(bfd) (coff_data (bfd)->raw_syment_count) #define obj_convert(bfd) (coff_data (bfd)->conversion_table) #define obj_conv_table_size(bfd) (coff_data (bfd)->conv_table_size) #define obj_coff_external_syms(bfd) (coff_data (bfd)->external_syms) #define obj_coff_keep_syms(bfd) (coff_data (bfd)->keep_syms) #define obj_coff_strings(bfd) (coff_data (bfd)->strings) #define obj_coff_strings_len(bfd) (coff_data (bfd)->strings_len) #define obj_coff_keep_strings(bfd) (coff_data (bfd)->keep_strings) #define obj_coff_sym_hashes(bfd) (coff_data (bfd)->sym_hashes) #define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written) #define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map) /* `Tdata' information kept for COFF files. */ typedef struct coff_tdata { struct coff_symbol_struct *symbols; /* Symtab for input bfd. */ unsigned int *conversion_table; int conv_table_size; file_ptr sym_filepos; struct coff_ptr_struct *raw_syments; unsigned long raw_syment_count; /* These are only valid once writing has begun. */ unsigned long int relocbase; /* These members communicate important constants about the symbol table to GDB's symbol-reading code. These `constants' unfortunately vary from coff implementation to implementation... */ unsigned local_n_btmask; unsigned local_n_btshft; unsigned local_n_tmask; unsigned local_n_tshift; unsigned local_symesz; unsigned local_auxesz; unsigned local_linesz; /* The unswapped external symbols. May be NULL. Read by _bfd_coff_get_external_symbols. */ void * external_syms; /* If this is TRUE, the external_syms may not be freed. */ bfd_boolean keep_syms; /* The string table. May be NULL. Read by _bfd_coff_read_string_table. */ char *strings; /* The length of the strings table. For error checking. */ bfd_size_type strings_len; /* If this is TRUE, the strings may not be freed. */ bfd_boolean keep_strings; /* If this is TRUE, the strings have been written out already. */ bfd_boolean strings_written; /* Is this a PE format coff file? */ int pe; /* Used by the COFF backend linker. */ struct coff_link_hash_entry **sym_hashes; /* Used by the pe linker for PowerPC. */ int *local_toc_sym_map; struct bfd_link_info *link_info; /* Used by coff_find_nearest_line. */ void * line_info; /* A place to stash dwarf2 info for this bfd. */ void * dwarf2_find_line_info; /* The timestamp from the COFF file header. */ long timestamp; /* Copy of some of the f_flags bits in the COFF filehdr structure, used by ARM code. */ flagword flags; /* coff-stgo32 EXE stub header after BFD tdata has been allocated. Its data is kept in internal_filehdr.go32stub beforehand. */ char *go32stub; } coff_data_type; /* Tdata for pe image files. */ typedef struct pe_tdata { coff_data_type coff; struct internal_extra_pe_aouthdr pe_opthdr; int dll; int has_reloc_section; int dont_strip_reloc; bfd_boolean insert_timestamp; bfd_boolean (*in_reloc_p) (bfd *, reloc_howto_type *); flagword real_flags; /* Build-id info. */ struct { bfd_boolean (*after_write_object_contents) (bfd *); const char *style; asection *sec; } build_id; } pe_data_type; #define pe_data(bfd) ((bfd)->tdata.pe_obj_data) /* Tdata for XCOFF files. */ struct xcoff_tdata { /* Basic COFF information. */ coff_data_type coff; /* TRUE if this is an XCOFF64 file. */ bfd_boolean xcoff64; /* TRUE if a large a.out header should be generated. */ bfd_boolean full_aouthdr; /* TOC value. */ bfd_vma toc; /* Index of section holding TOC. */ int sntoc; /* Index of section holding entry point. */ int snentry; /* .text alignment from optional header. */ int text_align_power; /* .data alignment from optional header. */ int data_align_power; /* modtype from optional header. */ short modtype; /* cputype from optional header. */ short cputype; /* maxdata from optional header. */ bfd_vma maxdata; /* maxstack from optional header. */ bfd_vma maxstack; /* Used by the XCOFF backend linker. */ asection **csects; long *debug_indices; unsigned int *lineno_counts; unsigned int import_file_id; }; #define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data) /* We take the address of the first element of an asymbol to ensure that the macro is only ever applied to an asymbol. */ #define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd))) /* The used_by_bfd field of a section may be set to a pointer to this structure. */ struct coff_section_tdata { /* The relocs, swapped into COFF internal form. This may be NULL. */ struct internal_reloc *relocs; /* If this is TRUE, the relocs entry may not be freed. */ bfd_boolean keep_relocs; /* The section contents. This may be NULL. */ bfd_byte *contents; /* If this is TRUE, the contents entry may not be freed. */ bfd_boolean keep_contents; /* Information cached by coff_find_nearest_line. */ bfd_vma offset; unsigned int i; const char *function; /* Optional information about a COMDAT entry; NULL if not COMDAT. */ struct coff_comdat_info *comdat; int line_base; /* A pointer used for .stab linking optimizations. */ void * stab_info; /* Available for individual backends. */ void * tdata; }; /* An accessor macro for the coff_section_tdata structure. */ #define coff_section_data(abfd, sec) \ ((struct coff_section_tdata *) (sec)->used_by_bfd) /* Tdata for sections in XCOFF files. This is used by the linker. */ struct xcoff_section_tdata { /* Used for XCOFF csects created by the linker; points to the real XCOFF section which contains this csect. */ asection *enclosing; /* The lineno_count field for the enclosing section, because we are going to clobber it there. */ unsigned int lineno_count; /* The first and last symbol indices for symbols used by this csect. */ unsigned long first_symndx; unsigned long last_symndx; }; /* An accessor macro the xcoff_section_tdata structure. */ #define xcoff_section_data(abfd, sec) \ ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata) /* Tdata for sections in PE files. */ struct pei_section_tdata { /* The virtual size of the section. */ bfd_size_type virt_size; /* The PE section flags. */ long pe_flags; }; /* An accessor macro for the pei_section_tdata structure. */ #define pei_section_data(abfd, sec) \ ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata) /* COFF linker hash table entries. */ struct coff_link_hash_entry { struct bfd_link_hash_entry root; /* Symbol index in output file. Set to -1 initially. Set to -2 if there is a reloc against this symbol. */ long indx; /* Symbol type. */ unsigned short type; /* Symbol class. */ unsigned char symbol_class; /* Number of auxiliary entries. */ char numaux; /* BFD to take auxiliary entries from. */ bfd *auxbfd; /* Pointer to array of auxiliary entries, if any. */ union internal_auxent *aux; /* Flag word; legal values follow. */ unsigned short coff_link_hash_flags; /* Symbol is a PE section symbol. */ #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01) }; /* COFF linker hash table. */ struct coff_link_hash_table { struct bfd_link_hash_table root; /* A pointer to information used to link stabs in sections. */ struct stab_info stab_info; }; /* Look up an entry in a COFF linker hash table. */ #define coff_link_hash_lookup(table, string, create, copy, follow) \ ((struct coff_link_hash_entry *) \ bfd_link_hash_lookup (&(table)->root, (string), (create), \ (copy), (follow))) /* Traverse a COFF linker hash table. */ #define coff_link_hash_traverse(table, func, info) \ (bfd_link_hash_traverse \ (&(table)->root, \ (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ (info))) /* Get the COFF linker hash table from a link_info structure. */ #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash)) /* Functions in coffgen.c. */ extern const bfd_target *coff_object_p (bfd *); extern struct bfd_section *coff_section_from_bfd_index (bfd *, int); extern long coff_get_symtab_upper_bound (bfd *); extern long coff_canonicalize_symtab (bfd *, asymbol **); extern int coff_count_linenumbers (bfd *); extern struct coff_symbol_struct *coff_symbol_from (bfd *, asymbol *); extern bfd_boolean coff_renumber_symbols (bfd *, int *); extern void coff_mangle_symbols (bfd *); extern bfd_boolean coff_write_symbols (bfd *); extern bfd_boolean coff_write_alien_symbol (bfd *, asymbol *, struct internal_syment *, bfd_vma *, bfd_size_type *, asection **, bfd_size_type *); extern bfd_boolean coff_write_linenumbers (bfd *); extern alent *coff_get_lineno (bfd *, asymbol *); extern asymbol *coff_section_symbol (bfd *, char *); extern bfd_boolean _bfd_coff_get_external_symbols (bfd *); extern const char *_bfd_coff_read_string_table (bfd *); extern bfd_boolean _bfd_coff_free_symbols (bfd *); extern struct coff_ptr_struct *coff_get_normalized_symtab (bfd *); extern long coff_get_reloc_upper_bound (bfd *, sec_ptr); extern asymbol *coff_make_empty_symbol (bfd *); extern void coff_print_symbol (bfd *, void * filep, asymbol *, bfd_print_symbol_type); extern void coff_get_symbol_info (bfd *, asymbol *, symbol_info *ret); extern bfd_boolean _bfd_coff_is_local_label_name (bfd *, const char *); extern asymbol *coff_bfd_make_debug_symbol (bfd *, void *, unsigned long); extern bfd_boolean coff_find_nearest_line (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **, unsigned int *, unsigned int *); #define coff_find_line _bfd_nosymbols_find_line struct dwarf_debug_section; extern bfd_boolean coff_find_nearest_line_with_names (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **, unsigned int *, const struct dwarf_debug_section *); extern bfd_boolean coff_find_inliner_info (bfd *, const char **, const char **, unsigned int *); extern int coff_sizeof_headers (bfd *, struct bfd_link_info *); extern bfd_boolean bfd_coff_reloc16_relax_section (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents (bfd *, struct bfd_link_info *, struct bfd_link_order *, bfd_byte *, bfd_boolean, asymbol **); extern bfd_vma bfd_coff_reloc16_get_value (arelent *, struct bfd_link_info *, asection *); extern void bfd_perform_slip (bfd *, unsigned int, asection *, bfd_vma); /* Functions and types in cofflink.c. */ #define STRING_SIZE_SIZE 4 /* We use a hash table to merge identical enum, struct, and union definitions in the linker. */ /* Information we keep for a single element (an enum value, a structure or union field) in the debug merge hash table. */ struct coff_debug_merge_element { /* Next element. */ struct coff_debug_merge_element *next; /* Name. */ const char *name; /* Type. */ unsigned int type; /* Symbol index for complex type. */ long tagndx; }; /* A linked list of debug merge entries for a given name. */ struct coff_debug_merge_type { /* Next type with the same name. */ struct coff_debug_merge_type *next; /* Class of type. */ int type_class; /* Symbol index where this type is defined. */ long indx; /* List of elements. */ struct coff_debug_merge_element *elements; }; /* Information we store in the debug merge hash table. */ struct coff_debug_merge_hash_entry { struct bfd_hash_entry root; /* A list of types with this name. */ struct coff_debug_merge_type *types; }; /* The debug merge hash table. */ struct coff_debug_merge_hash_table { struct bfd_hash_table root; }; /* Initialize a COFF debug merge hash table. */ #define coff_debug_merge_hash_table_init(table) \ (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \ sizeof (struct coff_debug_merge_hash_entry))) /* Free a COFF debug merge hash table. */ #define coff_debug_merge_hash_table_free(table) \ (bfd_hash_table_free (&(table)->root)) /* Look up an entry in a COFF debug merge hash table. */ #define coff_debug_merge_hash_lookup(table, string, create, copy) \ ((struct coff_debug_merge_hash_entry *) \ bfd_hash_lookup (&(table)->root, (string), (create), (copy))) /* Information we keep for each section in the output file when doing a relocatable link. */ struct coff_link_section_info { /* The relocs to be output. */ struct internal_reloc *relocs; /* For each reloc against a global symbol whose index was not known when the reloc was handled, the global hash table entry. */ struct coff_link_hash_entry **rel_hashes; }; /* Information that we pass around while doing the final link step. */ struct coff_final_link_info { /* General link information. */ struct bfd_link_info *info; /* Output BFD. */ bfd *output_bfd; /* Used to indicate failure in traversal routine. */ bfd_boolean failed; /* If doing "task linking" set only during the time when we want the global symbol writer to convert the storage class of defined global symbols from global to static. */ bfd_boolean global_to_static; /* Hash table for long symbol names. */ struct bfd_strtab_hash *strtab; /* When doing a relocatable link, an array of information kept for each output section, indexed by the target_index field. */ struct coff_link_section_info *section_info; /* Symbol index of last C_FILE symbol (-1 if none). */ long last_file_index; /* Contents of last C_FILE symbol. */ struct internal_syment last_file; /* Symbol index of first aux entry of last .bf symbol with an empty endndx field (-1 if none). */ long last_bf_index; /* Contents of last_bf_index aux entry. */ union internal_auxent last_bf; /* Hash table used to merge debug information. */ struct coff_debug_merge_hash_table debug_merge; /* Buffer large enough to hold swapped symbols of any input file. */ struct internal_syment *internal_syms; /* Buffer large enough to hold sections of symbols of any input file. */ asection **sec_ptrs; /* Buffer large enough to hold output indices of symbols of any input file. */ long *sym_indices; /* Buffer large enough to hold output symbols for any input file. */ bfd_byte *outsyms; /* Buffer large enough to hold external line numbers for any input section. */ bfd_byte *linenos; /* Buffer large enough to hold any input section. */ bfd_byte *contents; /* Buffer large enough to hold external relocs of any input section. */ bfd_byte *external_relocs; /* Buffer large enough to hold swapped relocs of any input section. */ struct internal_reloc *internal_relocs; }; /* Most COFF variants have no way to record the alignment of a section. This struct is used to set a specific alignment based on the name of the section. */ struct coff_section_alignment_entry { /* The section name. */ const char *name; /* This is either (unsigned int) -1, indicating that the section name must match exactly, or it is the number of letters which must match at the start of the name. */ unsigned int comparison_length; /* These macros may be used to fill in the first two fields in a structure initialization. */ #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1) #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1) /* Only use this entry if the default section alignment for this target is at least that much (as a power of two). If this field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ unsigned int default_alignment_min; /* Only use this entry if the default section alignment for this target is no greater than this (as a power of two). If this field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ unsigned int default_alignment_max; #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1) /* The desired alignment for this section (as a power of two). */ unsigned int alignment_power; }; extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); extern bfd_boolean _bfd_coff_link_hash_table_init (struct coff_link_hash_table *, bfd *, struct bfd_hash_entry *(*) (struct bfd_hash_entry *, struct bfd_hash_table *, const char *), unsigned int); extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create (bfd *); extern const char *_bfd_coff_internal_syment_name (bfd *, const struct internal_syment *, char *); extern bfd_boolean _bfd_coff_section_already_linked (bfd *, asection *, struct bfd_link_info *); extern bfd_boolean _bfd_coff_link_add_symbols (bfd *, struct bfd_link_info *); extern bfd_boolean _bfd_coff_final_link (bfd *, struct bfd_link_info *); extern struct internal_reloc *_bfd_coff_read_internal_relocs (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean, struct internal_reloc *); extern bfd_boolean _bfd_coff_generic_relocate_section (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, struct internal_reloc *, struct internal_syment *, asection **); extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); extern bfd_boolean _bfd_coff_write_global_sym (struct bfd_hash_entry *, void *); extern bfd_boolean _bfd_coff_write_task_globals (struct coff_link_hash_entry *, void *); extern bfd_boolean _bfd_coff_link_input_bfd (struct coff_final_link_info *, bfd *); extern bfd_boolean _bfd_coff_reloc_link_order (bfd *, struct coff_final_link_info *, asection *, struct bfd_link_order *); #define coff_get_section_contents_in_window \ _bfd_generic_get_section_contents_in_window /* Functions in xcofflink.c. */ extern long _bfd_xcoff_get_dynamic_symtab_upper_bound (bfd *); extern long _bfd_xcoff_canonicalize_dynamic_symtab (bfd *, asymbol **); extern long _bfd_xcoff_get_dynamic_reloc_upper_bound (bfd *); extern long _bfd_xcoff_canonicalize_dynamic_reloc (bfd *, arelent **, asymbol **); extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create (bfd *); extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols (bfd *, struct bfd_link_info *); extern bfd_boolean _bfd_xcoff_bfd_final_link (bfd *, struct bfd_link_info *); extern bfd_boolean _bfd_xcoff_define_common_symbol (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *); extern bfd_boolean _bfd_ppc_xcoff_relocate_section (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, struct internal_reloc *, struct internal_syment *, asection **); /* Functions in coff-ppc.c. FIXME: These are called by pe.em in the linker, and so should start with bfd and be declared in bfd.h. */ extern bfd_boolean ppc_allocate_toc_section (struct bfd_link_info *); extern bfd_boolean ppc_process_before_allocation (bfd *, struct bfd_link_info *);