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- /* Generic target-file-type support for the BFD library.
- Copyright (C) 1990-1991 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* $Id: targets.c,v 1.23 1991/07/31 16:58:03 gnu Exp $ */
-
- #include <sysdep.h>
- #include "bfd.h"
- #include "libbfd.h"
-
- /*doc*
- @section Targets
- Each port of BFD to a different machine requries 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 operatios performed are:
- @itemize @bullet
- @item
- First a bfd is created by calling the internal routine
- @code{new_bfd}, then @code{bfd_find_target} is called 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}, it looks up the environment variable
- @code{GNUTARGET} and uses that as the target string.
- @item
- If the target string is still NULL, or the target string
- is @code{default}, then the first item in the target vector is used as
- the target type. @xref{targets}.
- @item
- Otherwise, the elements in the target vector are
- inspected one by one, until a match on target name is found. When
- found, that is used.
- @item
- Otherwise the error @code{invalid_target} is returned 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. The routine returns @code{true} when
- the application guesses right.
- */
-
-
- /*proto* bfd_target
- @node bfd_target
- @subsection bfd_target
- This structure contains everything that BFD knows about a target.
- It includes things like its byte order, name, what routines to call
- to do various operations, etc.
-
- Every BFD points to a target structure with its "xvec" member.
-
-
- Shortcut for declaring fields which are prototyped function pointers,
- while avoiding anguish on compilers that don't support protos.
-
- $#define SDEF(ret, name, arglist) \
- $ PROTO(ret,(*name),arglist)
- $#define SDEF_FMT(ret, name, arglist) \
- $ PROTO(ret,(*name[bfd_type_end]),arglist)
-
- These macros are used to dispatch to functions through the bfd_target
- vector. They are used in a number of macros further down in bfd.h, and
- are also used when calling various routines by hand inside the bfd
- implementation. The "arglist" argument must be parenthesized; it
- contains all the arguments to the called function.
-
- $#define BFD_SEND(bfd, message, arglist) \
- $ ((*((bfd)->xvec->message)) arglist)
-
- For operations which index on the bfd format
-
- $#define BFD_SEND_FMT(bfd, message, arglist) \
- $ (((bfd)->xvec->message[(int)((bfd)->format)]) arglist)
-
- This is the struct which defines the type of BFD this is. The
- "xvec" member of the struct 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!
-
- *+++
-
- $typedef struct bfd_target
- ${
-
- identifies the kind of target, eg SunOS4, Ultrix, etc
-
- $ char *name;
-
- The "flavour" of a back end is a general indication about the contents
- of a file.
-
- $ enum target_flavour_enum {
- $ bfd_target_aout_flavour_enum,
- $ bfd_target_coff_flavour_enum,
- $ bfd_target_ieee_flavour_enum,
- $ bfd_target_oasys_flavour_enum,
- $ bfd_target_srec_flavour_enum} flavour;
-
- The order of bytes within the data area of a file.
-
- $ boolean byteorder_big_p;
-
- The order of bytes within the header parts of a file.
-
- $ boolean header_byteorder_big_p;
-
- This is a mask of all the flags which an executable may have set -
- from the set @code{NO_FLAGS}, @code{HAS_RELOC}, ...@code{D_PAGED}.
-
- $ flagword object_flags;
-
- This is 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 pad character for filenames within an archive header.
-
- $ char ar_pad_char;
-
- The maximum number of characters in an archive header.
-
- $ unsigned short ar_max_namelen;
-
- The minimum alignment restriction for any section.
-
- $ unsigned int align_power_min;
-
- Entries for byte swapping for data. These are different to the other
- entry points, since they don't take bfd as first arg. Certain other handlers
- could do the same.
-
- $ SDEF (bfd_vma, bfd_getx64, (bfd_byte *));
- $ SDEF (void, bfd_putx64, (bfd_vma, bfd_byte *));
- $ SDEF (bfd_vma, bfd_getx32, (bfd_byte *));
- $ SDEF (void, bfd_putx32, (bfd_vma, bfd_byte *));
- $ SDEF (bfd_vma, bfd_getx16, (bfd_byte *));
- $ SDEF (void, bfd_putx16, (bfd_vma, bfd_byte *));
-
- Byte swapping for the headers
-
- $ SDEF (bfd_vma, bfd_h_getx64, (bfd_byte *));
- $ SDEF (void, bfd_h_putx64, (bfd_vma, bfd_byte *));
- $ SDEF (bfd_vma, bfd_h_getx32, (bfd_byte *));
- $ SDEF (void, bfd_h_putx32, (bfd_vma, bfd_byte *));
- $ SDEF (bfd_vma, bfd_h_getx16, (bfd_byte *));
- $ SDEF (void, bfd_h_putx16, (bfd_vma, bfd_byte *));
-
- Format dependent routines, these turn into vectors of entry points
- within the target vector structure; one for each format to check.
-
- Check the format of a file being read. Return bfd_target * or zero.
-
- $ SDEF_FMT (struct bfd_target *, _bfd_check_format, (bfd *));
-
- Set the format of a file being written.
-
- $ SDEF_FMT (boolean, _bfd_set_format, (bfd *));
-
- Write cached information into a file being written, at bfd_close.
-
- $ SDEF_FMT (boolean, _bfd_write_contents, (bfd *));
-
- The following functions are defined in @code{JUMP_TABLE}. The idea is
- that the back end writer of @code{foo} names all the routines
- @code{foo_}@var{entry_point}, @code{JUMP_TABLE} will built the entries
- in this structure in the right order.
-
- Core file entry points
-
- $ SDEF (char *, _core_file_failing_command, (bfd *));
- $ SDEF (int, _core_file_failing_signal, (bfd *));
- $ SDEF (boolean, _core_file_matches_executable_p, (bfd *, bfd *));
-
- Archive entry points
-
- $ SDEF (boolean, _bfd_slurp_armap, (bfd *));
- $ SDEF (boolean, _bfd_slurp_extended_name_table, (bfd *));
- $ SDEF (void, _bfd_truncate_arname, (bfd *, CONST char *, char *));
- $ SDEF (boolean, write_armap, (bfd *arch,
- $ unsigned int elength,
- $ struct orl *map,
- $ int orl_count,
- $ int stridx));
-
- Standard stuff.
-
- $ SDEF (boolean, _close_and_cleanup, (bfd *));
- $ SDEF (boolean, _bfd_set_section_contents, (bfd *, sec_ptr, PTR,
- $ file_ptr, bfd_size_type));
- $ SDEF (boolean, _bfd_get_section_contents, (bfd *, sec_ptr, PTR,
- $ file_ptr, bfd_size_type));
- $ SDEF (boolean, _new_section_hook, (bfd *, sec_ptr));
-
- Symbols and reloctions
-
- $ SDEF (unsigned int, _get_symtab_upper_bound, (bfd *));
- $ SDEF (unsigned int, _bfd_canonicalize_symtab,
- $ (bfd *, struct symbol_cache_entry **));
- $ SDEF (unsigned int, _get_reloc_upper_bound, (bfd *, sec_ptr));
- $ SDEF (unsigned int, _bfd_canonicalize_reloc, (bfd *, sec_ptr, arelent **,
- $ struct symbol_cache_entry**));
- $ SDEF (struct symbol_cache_entry *, _bfd_make_empty_symbol, (bfd *));
- $ SDEF (void, _bfd_print_symbol, (bfd *, PTR, struct symbol_cache_entry *,
- $ bfd_print_symbol_enum_type));
- $#define bfd_print_symbol(b,p,s,e) BFD_SEND(b, _bfd_print_symbol, (b,p,s,e))
- $ SDEF (alent *, _get_lineno, (bfd *, struct symbol_cache_entry *));
- $
- $ SDEF (boolean, _bfd_set_arch_mach, (bfd *, enum bfd_architecture,
- $ unsigned long));
- $
- $ SDEF (bfd *, openr_next_archived_file, (bfd *arch, bfd *prev));
- $ SDEF (boolean, _bfd_find_nearest_line,
- $ (bfd *abfd, struct sec *section,
- $ struct symbol_cache_entry **symbols,bfd_vma offset,
- $ CONST char **file, CONST char **func, unsigned int *line));
- $ SDEF (int, _bfd_stat_arch_elt, (bfd *, struct stat *));
- $
- $ SDEF (int, _bfd_sizeof_headers, (bfd *, boolean));
- $
- $ SDEF (void, _bfd_debug_info_start, (bfd *));
- $ SDEF (void, _bfd_debug_info_end, (bfd *));
- $ SDEF (void, _bfd_debug_info_accumulate, (bfd *, struct sec *));
-
- Special entry points for gdb to swap in coff symbol table parts
-
- $ SDEF(void, _bfd_coff_swap_aux_in,(
- $ bfd *abfd ,
- $ PTR ext,
- $ int type,
- $ int class ,
- $ PTR in));
- $
- $ SDEF(void, _bfd_coff_swap_sym_in,(
- $ bfd *abfd ,
- $ PTR ext,
- $ PTR in));
- $
- $ SDEF(void, _bfd_coff_swap_lineno_in, (
- $ bfd *abfd,
- $ PTR ext,
- $ PTR in));
- $
- $} bfd_target;
-
- *---
-
- */
- extern bfd_target ecoff_little_vec;
- extern bfd_target ecoff_big_vec;
- extern bfd_target sunos_big_vec;
- extern bfd_target demo_64_vec;
- extern bfd_target srec_vec;
- extern bfd_target b_out_vec_little_host;
- extern bfd_target b_out_vec_big_host;
- extern bfd_target icoff_little_vec;
- extern bfd_target icoff_big_vec;
- extern bfd_target ieee_vec;
- extern bfd_target oasys_vec;
- extern bfd_target m88k_bcs_vec;
- extern bfd_target m68kcoff_vec;
- extern bfd_target i386coff_vec;
- #ifdef DEFAULT_VECTOR
- extern bfd_target DEFAULT_VECTOR;
- #endif
-
- #ifdef GNU960
- #define ICOFF_LITTLE_VEC icoff_little_vec
- #define ICOFF_BIG_VEC icoff_big_vec
- #define B_OUT_VEC_LITTLE_HOST b_out_vec_little_host
- #define B_OUT_VEC_BIG_HOST b_out_vec_big_host
- #endif /* GNU960 */
-
- #ifndef RESTRICTED
- #define ECOFF_LITTLE_VEC ecoff_little_vec
- #define ECOFF_BIG_VEC ecoff_big_vec
- #define ICOFF_LITTLE_VEC icoff_little_vec
- #define ICOFF_BIG_VEC icoff_big_vec
- #define ZB_OUT_VEC_LITTLE_HOST b_out_vec_little_host
- #define ZB_OUT_VEC_BIG_HOST b_out_vec_big_host
- #define SUNOS_VEC_BIG_HOST sunos_big_vec
- #define DEMO_64_VEC demo_64_vec
- #define OASYS_VEC oasys_vec
- #define IEEE_VEC ieee_vec
- #define M88K_BCS_VEC m88k_bcs_vec
- #define SREC_VEC srec_vec
- #define M68KCOFF_VEC m68kcoff_vec
- #define I386COFF_VEC i386coff_vec
- #endif
-
- bfd_target *target_vector[] = {
-
- #ifdef DEFAULT_VECTOR
- &DEFAULT_VECTOR,
- #endif /* DEFAULT_VECTOR */
-
- #ifdef I386COFF_VEC
- &I386COFF_VEC,
- #endif /* I386COFF_VEC */
-
- #ifdef ECOFF_LITTLE_VEC
- &ECOFF_LITTLE_VEC,
- #endif
-
- #ifdef ECOFF_BIG_VEC
- &ECOFF_BIG_VEC,
- #endif
- #ifdef IEEE_VEC
- &IEEE_VEC,
- #endif /* IEEE_VEC */
-
- #ifdef OASYS_VEC
- &OASYS_VEC,
- #endif /* OASYS_VEC */
-
- #ifdef SUNOS_VEC_BIG_HOST
- &SUNOS_VEC_BIG_HOST,
- #endif /* SUNOS_BIG_VEC */
-
-
- #ifdef HOST_64_BIT
- #ifdef DEMO_64_VEC
- &DEMO_64_VEC,
- #endif
- #endif
-
- #ifdef M88K_BCS_VEC
- &M88K_BCS_VEC,
- #endif /* M88K_BCS_VEC */
-
- #ifdef SREC_VEC
- &SREC_VEC,
- #endif /* SREC_VEC */
-
- #ifdef ICOFF_LITTLE_VEC
- &ICOFF_LITTLE_VEC,
- #endif /* ICOFF_LITTLE_VEC */
-
- #ifdef ICOFF_BIG_VEC
- &ICOFF_BIG_VEC,
- #endif /* ICOFF_BIG_VEC */
-
- #ifdef B_OUT_VEC_LITTLE_HOST
- &B_OUT_VEC_LITTLE_HOST,
- #endif /* B_OUT_VEC_LITTLE_HOST */
-
- #ifdef B_OUT_VEC_BIG_HOST
- &B_OUT_VEC_BIG_HOST,
- #endif /* B_OUT_VEC_BIG_HOST */
-
- #ifdef M68KCOFF_VEC
- &M68KCOFF_VEC,
- #endif /* M68KCOFF_VEC */
-
- #ifdef A29KCOFF_BIG_VEC
- &A29KCOFF_BIG_VEC,
- #endif /* A29KCOFF_BIG_VEC */
-
- NULL, /* end of list marker */
- };
-
-
- /* default_vector[0] contains either the address of the default vector,
- if there is one, or zero if there isn't. */
-
- bfd_target *default_vector[] = {
- #ifdef DEFAULT_VECTOR
- &DEFAULT_VECTOR,
- #endif
- 0,
- };
-
-
-
-
- /*proto*
- *i bfd_find_target
- Returns a pointer to the transfer vector for the object target
- named target_name. If target_name is NULL, chooses the one in the
- environment variable GNUTARGET; if that is null or not defined then
- the first entry in the target list is chosen. 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. This causes
- bfd_check_format to loop over all the targets to find the one
- that matches the file being read.
- *; PROTO(bfd_target *, bfd_find_target,(CONST char *, bfd *));
- *-*/
-
- bfd_target *
- DEFUN(bfd_find_target,(target_name, abfd),
- CONST char *target_name AND
- bfd *abfd)
- {
- bfd_target **target;
- extern char *getenv ();
- CONST char *targname = (target_name ? target_name : getenv ("GNUTARGET"));
-
- /* This is safe; the vector cannot be null */
- if (targname == NULL || !strcmp (targname, "default")) {
- abfd->target_defaulted = true;
- return abfd->xvec = target_vector[0];
- }
-
- abfd->target_defaulted = false;
-
- for (target = &target_vector[0]; *target != NULL; target++) {
- if (!strcmp (targname, (*target)->name))
- return abfd->xvec = *target;
- }
-
- bfd_error = invalid_target;
- return NULL;
- }
-
-
- /*proto*
- *i bfd_target_list
- This function returns a freshly malloced NULL-terminated vector of the
- names of all the valid bfd targets. Do not modify the names
- *; PROTO(CONST char **,bfd_target_list,());
-
- *-*/
-
- CONST char **
- DEFUN_VOID(bfd_target_list)
- {
- int vec_length= 0;
- bfd_target **target;
- CONST char **name_list, **name_ptr;
-
- for (target = &target_vector[0]; *target != NULL; target++)
- vec_length++;
-
- name_ptr =
- name_list = (CONST char **) zalloc ((vec_length + 1) * sizeof (char **));
-
- if (name_list == NULL) {
- bfd_error = no_memory;
- return NULL;
- }
-
-
-
- for (target = &target_vector[0]; *target != NULL; target++)
- *(name_ptr++) = (*target)->name;
-
- return name_list;
- }
-