bfd/doc/targets.texi - Issue 124383005: GDB 7.6.50

Unified Diff: bfd/doc/targets.texi

Issue 124383005: GDB 7.6.50 (Closed) Base URL: http://git.chromium.org/native_client/nacl-gdb.git@upstream

Patch Set: Created 6 years, 11 months ago

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Index: bfd/doc/targets.texi

diff --git a/bfd/doc/targets.texi b/bfd/doc/targets.texi

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--- a/bfd/doc/targets.texi

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@@ -1,617 +0,0 @@

-@section Targets

-@strong{Description}@*

-Each port of BFD to a different machine requires the creation

-of a target back end. All the back end provides to the root

-part of BFD is a structure containing pointers to functions

-which perform certain low level operations on files. BFD

-translates the applications's requests through a pointer into

-calls to the back end routines.

-When a file is opened with @code{bfd_openr}, its format and

-target are unknown. BFD uses various mechanisms to determine

-how to interpret the file. The operations performed are:

-@itemize @bullet

-@item

-Create a BFD by calling the internal routine

-@code{_bfd_new_bfd}, then call @code{bfd_find_target} with the

-target string supplied to @code{bfd_openr} and the new BFD pointer.

-@item

-If a null target string was provided to @code{bfd_find_target},

-look up the environment variable @code{GNUTARGET} and use

-that as the target string.

-@item

-If the target string is still @code{NULL}, or the target string is

-@code{default}, then use the first item in the target vector

-as the target type, and set @code{target_defaulted} in the BFD to

-cause @code{bfd_check_format} to loop through all the targets.

-@xref{bfd_target}. @xref{Formats}.

-@item

-Otherwise, inspect the elements in the target vector

-one by one, until a match on target name is found. When found,

-use it.

-@item

-Otherwise return the error @code{bfd_error_invalid_target} to

-@code{bfd_openr}.

-@item

-@code{bfd_openr} attempts to open the file using

-@code{bfd_open_file}, and returns the BFD.

-@end itemize

-Once the BFD has been opened and the target selected, the file

-format may be determined. This is done by calling

-@code{bfd_check_format} on the BFD with a suggested format.

-If @code{target_defaulted} has been set, each possible target

-type is tried to see if it recognizes the specified format.

-@code{bfd_check_format} returns @code{TRUE} when the caller guesses right.

-@menu

-* bfd_target::

-@end menu

-@node bfd_target, , Targets, Targets

-@subsection bfd_target

-@strong{Description}@*

-This structure contains everything that BFD knows about a

-target. It includes things like its byte order, name, and which

-routines to call to do various operations.

-Every BFD points to a target structure with its @code{xvec}

-member.

-The macros below are used to dispatch to functions through the

-@code{bfd_target} vector. They are used in a number of macros further

-down in @file{bfd.h}, and are also used when calling various

-routines by hand inside the BFD implementation. The @var{arglist}

-argument must be parenthesized; it contains all the arguments

-to the called function.

-They make the documentation (more) unpleasant to read, so if

-someone wants to fix this and not break the above, please do.

-@example

-#define BFD_SEND(bfd, message, arglist) \

- ((*((bfd)->xvec->message)) arglist)

-#ifdef DEBUG_BFD_SEND

-#undef BFD_SEND

-#define BFD_SEND(bfd, message, arglist) \

- (((bfd) && (bfd)->xvec && (bfd)->xvec->message) ? \

- ((*((bfd)->xvec->message)) arglist) : \

- (bfd_assert (__FILE__,__LINE__), NULL))

-#endif

-@end example

-For operations which index on the BFD format:

-@example

-#define BFD_SEND_FMT(bfd, message, arglist) \

- (((bfd)->xvec->message[(int) ((bfd)->format)]) arglist)

-#ifdef DEBUG_BFD_SEND

-#undef BFD_SEND_FMT

-#define BFD_SEND_FMT(bfd, message, arglist) \

- (((bfd) && (bfd)->xvec && (bfd)->xvec->message) ? \

- (((bfd)->xvec->message[(int) ((bfd)->format)]) arglist) : \

- (bfd_assert (__FILE__,__LINE__), NULL))

-#endif

-@end example

-This is the structure which defines the type of BFD this is. The

-@code{xvec} member of the struct @code{bfd} itself points here. Each

-module that implements access to a different target under BFD,

-defines one of these.

-FIXME, these names should be rationalised with the names of

-the entry points which call them. Too bad we can't have one

-macro to define them both!

-@example

-enum bfd_flavour

-@{

- bfd_target_unknown_flavour,

- bfd_target_aout_flavour,

- bfd_target_coff_flavour,

- bfd_target_ecoff_flavour,

- bfd_target_xcoff_flavour,

- bfd_target_elf_flavour,

- bfd_target_ieee_flavour,

- bfd_target_nlm_flavour,

- bfd_target_oasys_flavour,

- bfd_target_tekhex_flavour,

- bfd_target_srec_flavour,

- bfd_target_verilog_flavour,

- bfd_target_ihex_flavour,

- bfd_target_som_flavour,

- bfd_target_os9k_flavour,

- bfd_target_versados_flavour,

- bfd_target_msdos_flavour,

- bfd_target_ovax_flavour,

- bfd_target_evax_flavour,

- bfd_target_mmo_flavour,

- bfd_target_mach_o_flavour,

- bfd_target_pef_flavour,

- bfd_target_pef_xlib_flavour,

- bfd_target_sym_flavour

-@};

-enum bfd_endian @{ BFD_ENDIAN_BIG, BFD_ENDIAN_LITTLE, BFD_ENDIAN_UNKNOWN @};

-/* Forward declaration. */

-typedef struct bfd_link_info _bfd_link_info;

-/* Forward declaration. */

-typedef struct flag_info flag_info;

-typedef struct bfd_target

-@{

- /* Identifies the kind of target, e.g., SunOS4, Ultrix, etc. */

- char *name;

- /* The "flavour" of a back end is a general indication about

- the contents of a file. */

- enum bfd_flavour flavour;

- /* The order of bytes within the data area of a file. */

- enum bfd_endian byteorder;

- /* The order of bytes within the header parts of a file. */

- enum bfd_endian header_byteorder;

- /* A mask of all the flags which an executable may have set -

- from the set @code{BFD_NO_FLAGS}, @code{HAS_RELOC}, ...@code{D_PAGED}. */

- flagword object_flags;

- /* A mask of all the flags which a section may have set - from

- the set @code{SEC_NO_FLAGS}, @code{SEC_ALLOC}, ...@code{SET_NEVER_LOAD}. */

- flagword section_flags;

- /* The character normally found at the front of a symbol.

- (if any), perhaps `_'. */

- char symbol_leading_char;

- /* The pad character for file names within an archive header. */

- char ar_pad_char;

- /* The maximum number of characters in an archive header. */

- unsigned char ar_max_namelen;

- /* How well this target matches, used to select between various

- possible targets when more than one target matches. */

- unsigned char match_priority;

- /* Entries for byte swapping for data. These are different from the

- other entry points, since they don't take a BFD as the first argument.

- Certain other handlers could do the same. */

- bfd_uint64_t (*bfd_getx64) (const void *);

- bfd_int64_t (*bfd_getx_signed_64) (const void *);

- void (*bfd_putx64) (bfd_uint64_t, void *);

- bfd_vma (*bfd_getx32) (const void *);

- bfd_signed_vma (*bfd_getx_signed_32) (const void *);

- void (*bfd_putx32) (bfd_vma, void *);

- bfd_vma (*bfd_getx16) (const void *);

- bfd_signed_vma (*bfd_getx_signed_16) (const void *);

- void (*bfd_putx16) (bfd_vma, void *);

- /* Byte swapping for the headers. */

- bfd_uint64_t (*bfd_h_getx64) (const void *);

- bfd_int64_t (*bfd_h_getx_signed_64) (const void *);

- void (*bfd_h_putx64) (bfd_uint64_t, void *);

- bfd_vma (*bfd_h_getx32) (const void *);

- bfd_signed_vma (*bfd_h_getx_signed_32) (const void *);

- void (*bfd_h_putx32) (bfd_vma, void *);

- bfd_vma (*bfd_h_getx16) (const void *);

- bfd_signed_vma (*bfd_h_getx_signed_16) (const void *);

- void (*bfd_h_putx16) (bfd_vma, void *);

- /* Format dependent routines: these are vectors of entry points

- within the target vector structure, one for each format to check. */

- /* Check the format of a file being read. Return a @code{bfd_target *} or zero. */

- const struct bfd_target *(*_bfd_check_format[bfd_type_end]) (bfd *);

- /* Set the format of a file being written. */

- bfd_boolean (*_bfd_set_format[bfd_type_end]) (bfd *);

- /* Write cached information into a file being written, at @code{bfd_close}. */

- bfd_boolean (*_bfd_write_contents[bfd_type_end]) (bfd *);

-@end example

-The general target vector. These vectors are initialized using the

-BFD_JUMP_TABLE macros.

-@example

- /* Generic entry points. */

-#define BFD_JUMP_TABLE_GENERIC(NAME) \

- NAME##_close_and_cleanup, \

- NAME##_bfd_free_cached_info, \

- NAME##_new_section_hook, \

- NAME##_get_section_contents, \

- NAME##_get_section_contents_in_window

- /* Called when the BFD is being closed to do any necessary cleanup. */

- bfd_boolean (*_close_and_cleanup) (bfd *);

- /* Ask the BFD to free all cached information. */

- bfd_boolean (*_bfd_free_cached_info) (bfd *);

- /* Called when a new section is created. */

- bfd_boolean (*_new_section_hook) (bfd *, sec_ptr);

- /* Read the contents of a section. */

- bfd_boolean (*_bfd_get_section_contents)

- (bfd *, sec_ptr, void *, file_ptr, bfd_size_type);

- bfd_boolean (*_bfd_get_section_contents_in_window)

- (bfd *, sec_ptr, bfd_window *, file_ptr, bfd_size_type);

- /* Entry points to copy private data. */

-#define BFD_JUMP_TABLE_COPY(NAME) \

- NAME##_bfd_copy_private_bfd_data, \

- NAME##_bfd_merge_private_bfd_data, \

- _bfd_generic_init_private_section_data, \

- NAME##_bfd_copy_private_section_data, \

- NAME##_bfd_copy_private_symbol_data, \

- NAME##_bfd_copy_private_header_data, \

- NAME##_bfd_set_private_flags, \

- NAME##_bfd_print_private_bfd_data

- /* Called to copy BFD general private data from one object file

- to another. */

- bfd_boolean (*_bfd_copy_private_bfd_data) (bfd *, bfd *);

- /* Called to merge BFD general private data from one object file

- to a common output file when linking. */

- bfd_boolean (*_bfd_merge_private_bfd_data) (bfd *, bfd *);

- /* Called to initialize BFD private section data from one object file

- to another. */

-#define bfd_init_private_section_data(ibfd, isec, obfd, osec, link_info) \

- BFD_SEND (obfd, _bfd_init_private_section_data, (ibfd, isec, obfd, osec, link_info))

- bfd_boolean (*_bfd_init_private_section_data)

- (bfd *, sec_ptr, bfd *, sec_ptr, struct bfd_link_info *);

- /* Called to copy BFD private section data from one object file

- to another. */

- bfd_boolean (*_bfd_copy_private_section_data)

- (bfd *, sec_ptr, bfd *, sec_ptr);

- /* Called to copy BFD private symbol data from one symbol

- to another. */

- bfd_boolean (*_bfd_copy_private_symbol_data)

- (bfd *, asymbol *, bfd *, asymbol *);

- /* Called to copy BFD private header data from one object file

- to another. */

- bfd_boolean (*_bfd_copy_private_header_data)

- (bfd *, bfd *);

- /* Called to set private backend flags. */

- bfd_boolean (*_bfd_set_private_flags) (bfd *, flagword);

- /* Called to print private BFD data. */

- bfd_boolean (*_bfd_print_private_bfd_data) (bfd *, void *);

- /* Core file entry points. */

-#define BFD_JUMP_TABLE_CORE(NAME) \

- NAME##_core_file_failing_command, \

- NAME##_core_file_failing_signal, \

- NAME##_core_file_matches_executable_p, \

- NAME##_core_file_pid

- char * (*_core_file_failing_command) (bfd *);

- int (*_core_file_failing_signal) (bfd *);

- bfd_boolean (*_core_file_matches_executable_p) (bfd *, bfd *);

- int (*_core_file_pid) (bfd *);

- /* Archive entry points. */

-#define BFD_JUMP_TABLE_ARCHIVE(NAME) \

- NAME##_slurp_armap, \

- NAME##_slurp_extended_name_table, \

- NAME##_construct_extended_name_table, \

- NAME##_truncate_arname, \

- NAME##_write_armap, \

- NAME##_read_ar_hdr, \

- NAME##_write_ar_hdr, \

- NAME##_openr_next_archived_file, \

- NAME##_get_elt_at_index, \

- NAME##_generic_stat_arch_elt, \

- NAME##_update_armap_timestamp

- bfd_boolean (*_bfd_slurp_armap) (bfd *);

- bfd_boolean (*_bfd_slurp_extended_name_table) (bfd *);

- bfd_boolean (*_bfd_construct_extended_name_table)

- (bfd *, char **, bfd_size_type *, const char **);

- void (*_bfd_truncate_arname) (bfd *, const char *, char *);

- bfd_boolean (*write_armap)

- (bfd *, unsigned int, struct orl *, unsigned int, int);

- void * (*_bfd_read_ar_hdr_fn) (bfd *);

- bfd_boolean (*_bfd_write_ar_hdr_fn) (bfd *, bfd *);

- bfd * (*openr_next_archived_file) (bfd *, bfd *);

-#define bfd_get_elt_at_index(b,i) BFD_SEND (b, _bfd_get_elt_at_index, (b,i))

- bfd * (*_bfd_get_elt_at_index) (bfd *, symindex);

- int (*_bfd_stat_arch_elt) (bfd *, struct stat *);

- bfd_boolean (*_bfd_update_armap_timestamp) (bfd *);

- /* Entry points used for symbols. */

-#define BFD_JUMP_TABLE_SYMBOLS(NAME) \

- NAME##_get_symtab_upper_bound, \

- NAME##_canonicalize_symtab, \

- NAME##_make_empty_symbol, \

- NAME##_print_symbol, \

- NAME##_get_symbol_info, \

- NAME##_bfd_is_local_label_name, \

- NAME##_bfd_is_target_special_symbol, \

- NAME##_get_lineno, \

- NAME##_find_nearest_line, \

- _bfd_generic_find_line, \

- NAME##_find_inliner_info, \

- NAME##_bfd_make_debug_symbol, \

- NAME##_read_minisymbols, \

- NAME##_minisymbol_to_symbol

- long (*_bfd_get_symtab_upper_bound) (bfd *);

- long (*_bfd_canonicalize_symtab)

- (bfd *, struct bfd_symbol **);

- struct bfd_symbol *

- (*_bfd_make_empty_symbol) (bfd *);

- void (*_bfd_print_symbol)

- (bfd *, void *, struct bfd_symbol *, bfd_print_symbol_type);

-#define bfd_print_symbol(b,p,s,e) BFD_SEND (b, _bfd_print_symbol, (b,p,s,e))

- void (*_bfd_get_symbol_info)

- (bfd *, struct bfd_symbol *, symbol_info *);

-#define bfd_get_symbol_info(b,p,e) BFD_SEND (b, _bfd_get_symbol_info, (b,p,e))

- bfd_boolean (*_bfd_is_local_label_name) (bfd *, const char *);

- bfd_boolean (*_bfd_is_target_special_symbol) (bfd *, asymbol *);

- alent * (*_get_lineno) (bfd *, struct bfd_symbol *);

- bfd_boolean (*_bfd_find_nearest_line)

- (bfd *, struct bfd_section *, struct bfd_symbol **, bfd_vma,

- const char **, const char **, unsigned int *);

- bfd_boolean (*_bfd_find_line)

- (bfd *, struct bfd_symbol **, struct bfd_symbol *,

- const char **, unsigned int *);

- bfd_boolean (*_bfd_find_inliner_info)

- (bfd *, const char **, const char **, unsigned int *);

- /* Back-door to allow format-aware applications to create debug symbols

- while using BFD for everything else. Currently used by the assembler

- when creating COFF files. */

- asymbol * (*_bfd_make_debug_symbol)

- (bfd *, void *, unsigned long size);

-#define bfd_read_minisymbols(b, d, m, s) \

- BFD_SEND (b, _read_minisymbols, (b, d, m, s))

- long (*_read_minisymbols)

- (bfd *, bfd_boolean, void **, unsigned int *);

-#define bfd_minisymbol_to_symbol(b, d, m, f) \

- BFD_SEND (b, _minisymbol_to_symbol, (b, d, m, f))

- asymbol * (*_minisymbol_to_symbol)

- (bfd *, bfd_boolean, const void *, asymbol *);

- /* Routines for relocs. */

-#define BFD_JUMP_TABLE_RELOCS(NAME) \

- NAME##_get_reloc_upper_bound, \

- NAME##_canonicalize_reloc, \

- NAME##_bfd_reloc_type_lookup, \

- NAME##_bfd_reloc_name_lookup

- long (*_get_reloc_upper_bound) (bfd *, sec_ptr);

- long (*_bfd_canonicalize_reloc)

- (bfd *, sec_ptr, arelent **, struct bfd_symbol **);

- /* See documentation on reloc types. */

- reloc_howto_type *

- (*reloc_type_lookup) (bfd *, bfd_reloc_code_real_type);

- reloc_howto_type *

- (*reloc_name_lookup) (bfd *, const char *);

- /* Routines used when writing an object file. */

-#define BFD_JUMP_TABLE_WRITE(NAME) \

- NAME##_set_arch_mach, \

- NAME##_set_section_contents

- bfd_boolean (*_bfd_set_arch_mach)

- (bfd *, enum bfd_architecture, unsigned long);

- bfd_boolean (*_bfd_set_section_contents)

- (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);

- /* Routines used by the linker. */

-#define BFD_JUMP_TABLE_LINK(NAME) \

- NAME##_sizeof_headers, \

- NAME##_bfd_get_relocated_section_contents, \

- NAME##_bfd_relax_section, \

- NAME##_bfd_link_hash_table_create, \

- NAME##_bfd_link_hash_table_free, \

- NAME##_bfd_link_add_symbols, \

- NAME##_bfd_link_just_syms, \

- NAME##_bfd_copy_link_hash_symbol_type, \

- NAME##_bfd_final_link, \

- NAME##_bfd_link_split_section, \

- NAME##_bfd_gc_sections, \

- NAME##_bfd_lookup_section_flags, \

- NAME##_bfd_merge_sections, \

- NAME##_bfd_is_group_section, \

- NAME##_bfd_discard_group, \

- NAME##_section_already_linked, \

- NAME##_bfd_define_common_symbol

- int (*_bfd_sizeof_headers) (bfd *, struct bfd_link_info *);

- bfd_byte * (*_bfd_get_relocated_section_contents)

- (bfd *, struct bfd_link_info *, struct bfd_link_order *,

- bfd_byte *, bfd_boolean, struct bfd_symbol **);

- bfd_boolean (*_bfd_relax_section)

- (bfd *, struct bfd_section *, struct bfd_link_info *, bfd_boolean *);

- /* Create a hash table for the linker. Different backends store

- different information in this table. */

- struct bfd_link_hash_table *

- (*_bfd_link_hash_table_create) (bfd *);

- /* Release the memory associated with the linker hash table. */

- void (*_bfd_link_hash_table_free) (struct bfd_link_hash_table *);

- /* Add symbols from this object file into the hash table. */

- bfd_boolean (*_bfd_link_add_symbols) (bfd *, struct bfd_link_info *);

- /* Indicate that we are only retrieving symbol values from this section. */

- void (*_bfd_link_just_syms) (asection *, struct bfd_link_info *);

- /* Copy the symbol type of a linker hash table entry. */

-#define bfd_copy_link_hash_symbol_type(b, t, f) \

- BFD_SEND (b, _bfd_copy_link_hash_symbol_type, (b, t, f))

- void (*_bfd_copy_link_hash_symbol_type)

- (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);

- /* Do a link based on the link_order structures attached to each

- section of the BFD. */

- bfd_boolean (*_bfd_final_link) (bfd *, struct bfd_link_info *);

- /* Should this section be split up into smaller pieces during linking. */

- bfd_boolean (*_bfd_link_split_section) (bfd *, struct bfd_section *);

- /* Remove sections that are not referenced from the output. */

- bfd_boolean (*_bfd_gc_sections) (bfd *, struct bfd_link_info *);

- /* Sets the bitmask of allowed and disallowed section flags. */

- bfd_boolean (*_bfd_lookup_section_flags) (struct bfd_link_info *,

- struct flag_info *,

- asection *);

- /* Attempt to merge SEC_MERGE sections. */

- bfd_boolean (*_bfd_merge_sections) (bfd *, struct bfd_link_info *);

- /* Is this section a member of a group? */

- bfd_boolean (*_bfd_is_group_section) (bfd *, const struct bfd_section *);

- /* Discard members of a group. */

- bfd_boolean (*_bfd_discard_group) (bfd *, struct bfd_section *);

- /* Check if SEC has been already linked during a reloceatable or

- final link. */

- bfd_boolean (*_section_already_linked) (bfd *, asection *,

- struct bfd_link_info *);

- /* Define a common symbol. */

- bfd_boolean (*_bfd_define_common_symbol) (bfd *, struct bfd_link_info *,

- struct bfd_link_hash_entry *);

- /* Routines to handle dynamic symbols and relocs. */

-#define BFD_JUMP_TABLE_DYNAMIC(NAME) \

- NAME##_get_dynamic_symtab_upper_bound, \

- NAME##_canonicalize_dynamic_symtab, \

- NAME##_get_synthetic_symtab, \

- NAME##_get_dynamic_reloc_upper_bound, \

- NAME##_canonicalize_dynamic_reloc

- /* Get the amount of memory required to hold the dynamic symbols. */

- long (*_bfd_get_dynamic_symtab_upper_bound) (bfd *);

- /* Read in the dynamic symbols. */

- long (*_bfd_canonicalize_dynamic_symtab)

- (bfd *, struct bfd_symbol **);

- /* Create synthetized symbols. */

- long (*_bfd_get_synthetic_symtab)

- (bfd *, long, struct bfd_symbol **, long, struct bfd_symbol **,

- struct bfd_symbol **);

- /* Get the amount of memory required to hold the dynamic relocs. */

- long (*_bfd_get_dynamic_reloc_upper_bound) (bfd *);

- /* Read in the dynamic relocs. */

- long (*_bfd_canonicalize_dynamic_reloc)

- (bfd *, arelent **, struct bfd_symbol **);

-@end example

-A pointer to an alternative bfd_target in case the current one is not

-satisfactory. This can happen when the target cpu supports both big

-and little endian code, and target chosen by the linker has the wrong

-endianness. The function open_output() in ld/ldlang.c uses this field

-to find an alternative output format that is suitable.

-@example

- /* Opposite endian version of this target. */

- const struct bfd_target * alternative_target;

- /* Data for use by back-end routines, which isn't

- generic enough to belong in this structure. */

- const void *backend_data;

-@} bfd_target;

-@end example

-@findex bfd_set_default_target

-@subsubsection @code{bfd_set_default_target}

-@strong{Synopsis}

-@example

-bfd_boolean bfd_set_default_target (const char *name);

-@end example

-@strong{Description}@*

-Set the default target vector to use when recognizing a BFD.

-This takes the name of the target, which may be a BFD target

-name or a configuration triplet.

-@findex bfd_find_target

-@subsubsection @code{bfd_find_target}

-@strong{Synopsis}

-@example

-const bfd_target *bfd_find_target (const char *target_name, bfd *abfd);

-@end example

-@strong{Description}@*

-Return a pointer to the transfer vector for the object target

-named @var{target_name}. If @var{target_name} is @code{NULL},

-choose the one in the environment variable @code{GNUTARGET}; if

-that is null or not defined, then choose the first entry in the

-target list. Passing in the string "default" or setting the

-environment variable to "default" will cause the first entry in

-the target list to be returned, and "target_defaulted" will be

-set in the BFD if @var{abfd} isn't @code{NULL}. This causes

-@code{bfd_check_format} to loop over all the targets to find the

-one that matches the file being read.

-@findex bfd_get_target_info

-@subsubsection @code{bfd_get_target_info}

-@strong{Synopsis}

-@example

-const bfd_target *bfd_get_target_info (const char *target_name,

- bfd *abfd,

- bfd_boolean *is_bigendian,

- int *underscoring,

- const char **def_target_arch);