diff options
Diffstat (limited to 'gnu/usr.bin/gdb/bfd/targets.c')
| -rw-r--r-- | gnu/usr.bin/gdb/bfd/targets.c | 635 |
1 files changed, 635 insertions, 0 deletions
diff --git a/gnu/usr.bin/gdb/bfd/targets.c b/gnu/usr.bin/gdb/bfd/targets.c new file mode 100644 index 000000000000..d6a966588c45 --- /dev/null +++ b/gnu/usr.bin/gdb/bfd/targets.c @@ -0,0 +1,635 @@ +/* Generic target-file-type support for the BFD library. + Copyright 1990, 1991, 1992, 1993 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. */ + +#include "bfd.h" +#include "sysdep.h" +#include "libbfd.h" + +/* +SECTION + Targets + +DESCRIPTION + 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 <<bfd_openr>>, its format and + target are unknown. BFD uses various mechanisms to determine + how to interpret the file. The operations performed are: + + o First a BFD is created by calling the internal routine + <<new_bfd>>, then <<bfd_find_target>> is called with the + target string supplied to <<bfd_openr>> and the new BFD pointer. + + o If a null target string was provided to <<bfd_find_target>>, + it looks up the environment variable <<GNUTARGET>> and uses + that as the target string. + + o If the target string is still NULL, or the target string is + <<default>>, then the first item in the target vector is used + as the target type, and <<target_defaulted>> is set to + cause <<bfd_check_format>> to loop through all the targets. + @xref{bfd_target}. @xref{Formats}. + + o 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. + + o Otherwise the error <<invalid_target>> is returned to + <<bfd_openr>>. + + o <<bfd_openr>> attempts to open the file using + <<bfd_open_file>>, and returns the BFD. + + Once the BFD has been opened and the target selected, the file + format may be determined. This is done by calling + <<bfd_check_format>> on the BFD with a suggested format. + If <<target_defaulted>> has been set, each possible target + type is tried to see if it recognizes the specified format. The + routine returns <<true>> when the application guesses right. +@menu +@* bfd_target:: +@end menu +*/ + + +/* + +INODE + bfd_target, , Targets, Targets +DOCDD +SUBSECTION + bfd_target + +DESCRIPTION + 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. + + These macros are used to dispatch to functions through the + 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 "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. + +.#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 { +. bfd_target_unknown_flavour, +. bfd_target_aout_flavour, +. bfd_target_coff_flavour, +. bfd_target_ecoff_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_hppa_flavour} 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 <<NO_FLAGS>>, <<HAS_RELOC>>, ...<<D_PAGED>>. + +. flagword object_flags; + +This is a mask of all the flags which a section may have set - from +the set <<SEC_NO_FLAGS>>, <<SEC_ALLOC>>, ...<<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 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. + +. bfd_vma (*bfd_getx64) PARAMS ((bfd_byte *)); +. bfd_signed_vma (*bfd_getx_signed_64) PARAMS ((bfd_byte *)); +. void (*bfd_putx64) PARAMS ((bfd_vma, bfd_byte *)); +. bfd_vma (*bfd_getx32) PARAMS ((bfd_byte *)); +. bfd_signed_vma (*bfd_getx_signed_32) PARAMS ((bfd_byte *)); +. void (*bfd_putx32) PARAMS ((bfd_vma, bfd_byte *)); +. bfd_vma (*bfd_getx16) PARAMS ((bfd_byte *)); +. bfd_signed_vma (*bfd_getx_signed_16) PARAMS ((bfd_byte *)); +. void (*bfd_putx16) PARAMS ((bfd_vma, bfd_byte *)); + +Byte swapping for the headers + +. bfd_vma (*bfd_h_getx64) PARAMS ((bfd_byte *)); +. bfd_signed_vma (*bfd_h_getx_signed_64) PARAMS ((bfd_byte *)); +. void (*bfd_h_putx64) PARAMS ((bfd_vma, bfd_byte *)); +. bfd_vma (*bfd_h_getx32) PARAMS ((bfd_byte *)); +. bfd_signed_vma (*bfd_h_getx_signed_32) PARAMS ((bfd_byte *)); +. void (*bfd_h_putx32) PARAMS ((bfd_vma, bfd_byte *)); +. bfd_vma (*bfd_h_getx16) PARAMS ((bfd_byte *)); +. bfd_signed_vma (*bfd_h_getx_signed_16) PARAMS ((bfd_byte *)); +. void (*bfd_h_putx16) PARAMS ((bfd_vma, bfd_byte *)); + +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 bfd_target * or zero. + +. struct bfd_target * (*_bfd_check_format[bfd_type_end]) PARAMS ((bfd *)); + +Set the format of a file being written. + +. boolean (*_bfd_set_format[bfd_type_end]) PARAMS ((bfd *)); + +Write cached information into a file being written, at bfd_close. + +. boolean (*_bfd_write_contents[bfd_type_end]) PARAMS ((bfd *)); + +The following functions are defined in <<JUMP_TABLE>>. The idea is +that the back end writer of <<foo>> names all the routines +<<foo_>>@var{entry_point}, <<JUMP_TABLE>> will built the entries +in this structure in the right order. + +Core file entry points + +. char * (*_core_file_failing_command) PARAMS ((bfd *)); +. int (*_core_file_failing_signal) PARAMS ((bfd *)); +. boolean (*_core_file_matches_executable_p) PARAMS ((bfd *, bfd *)); + +Archive entry points + +. boolean (*_bfd_slurp_armap) PARAMS ((bfd *)); +. boolean (*_bfd_slurp_extended_name_table) PARAMS ((bfd *)); +. void (*_bfd_truncate_arname) PARAMS ((bfd *, CONST char *, char *)); +. boolean (*write_armap) PARAMS ((bfd *arch, +. unsigned int elength, +. struct orl *map, +. unsigned int orl_count, +. int stridx)); + +Standard stuff. + +. boolean (*_close_and_cleanup) PARAMS ((bfd *)); +. boolean (*_bfd_set_section_contents) PARAMS ((bfd *, sec_ptr, PTR, +. file_ptr, bfd_size_type)); +. boolean (*_bfd_get_section_contents) PARAMS ((bfd *, sec_ptr, PTR, +. file_ptr, bfd_size_type)); +. boolean (*_new_section_hook) PARAMS ((bfd *, sec_ptr)); + +Symbols and relocations + +. unsigned int (*_get_symtab_upper_bound) PARAMS ((bfd *)); +. unsigned int (*_bfd_canonicalize_symtab) PARAMS ((bfd *, +. struct symbol_cache_entry **)); +. unsigned int (*_get_reloc_upper_bound) PARAMS ((bfd *, sec_ptr)); +. unsigned int (*_bfd_canonicalize_reloc) PARAMS ((bfd *, sec_ptr, arelent **, +. struct symbol_cache_entry **)); +. struct symbol_cache_entry * +. (*_bfd_make_empty_symbol) PARAMS ((bfd *)); +. void (*_bfd_print_symbol) PARAMS ((bfd *, PTR, +. struct symbol_cache_entry *, +. 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) PARAMS ((bfd *, +. struct symbol_cache_entry *, +. symbol_info *)); +.#define bfd_get_symbol_info(b,p,e) BFD_SEND(b, _bfd_get_symbol_info, (b,p,e)) + +. alent * (*_get_lineno) PARAMS ((bfd *, struct symbol_cache_entry *)); +. +. boolean (*_bfd_set_arch_mach) PARAMS ((bfd *, enum bfd_architecture, +. unsigned long)); +. +. bfd * (*openr_next_archived_file) PARAMS ((bfd *arch, bfd *prev)); +. +. boolean (*_bfd_find_nearest_line) PARAMS ((bfd *abfd, +. struct sec *section, struct symbol_cache_entry **symbols, +. bfd_vma offset, CONST char **file, CONST char **func, +. unsigned int *line)); +. +. int (*_bfd_stat_arch_elt) PARAMS ((bfd *, struct stat *)); +. +. int (*_bfd_sizeof_headers) PARAMS ((bfd *, boolean)); +. +. void (*_bfd_debug_info_start) PARAMS ((bfd *)); +. void (*_bfd_debug_info_end) PARAMS ((bfd *)); +. void (*_bfd_debug_info_accumulate) PARAMS ((bfd *, struct sec *)); +. +. bfd_byte * (*_bfd_get_relocated_section_contents) PARAMS ((bfd *, +. struct bfd_seclet *, bfd_byte *data, +. boolean relocateable)); +. +. boolean (*_bfd_relax_section) PARAMS ((bfd *, struct sec *, +. struct symbol_cache_entry **)); +. +. boolean (*_bfd_seclet_link) PARAMS ((bfd *, PTR data, +. boolean relocateable)); + +. {* See documentation on reloc types. *} +. CONST struct reloc_howto_struct * +. (*reloc_type_lookup) PARAMS ((bfd *abfd, +. bfd_reloc_code_real_type code)); +. +. {* 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) PARAMS (( +. bfd *abfd, +. void *ptr, +. unsigned long size)); + +Data for use by back-end routines, which isn't generic enough to belong +in this structure. + +. PTR backend_data; +.} bfd_target; + +*/ + +/* All known xvecs (even those that don't compile on all systems). + Alphabetized for easy reference. + They are listed a second time below, since + we can't intermix extern's and initializers. */ +extern bfd_target a29kcoff_big_vec; +extern bfd_target a_out_adobe_vec; +extern bfd_target aout_mips_big_vec; +extern bfd_target aout_mips_little_vec; +extern bfd_target apollocoff_vec; +extern bfd_target b_out_vec_big_host; +extern bfd_target b_out_vec_little_host; +extern bfd_target bfd_elf32_big_generic_vec; +extern bfd_target bfd_elf32_bigmips_vec; +extern bfd_target bfd_elf32_hppa_vec; +extern bfd_target bfd_elf32_i386_vec; +extern bfd_target bfd_elf32_i860_vec; +extern bfd_target bfd_elf32_little_generic_vec; +extern bfd_target bfd_elf32_littlemips_vec; +extern bfd_target bfd_elf32_m68k_vec; +extern bfd_target bfd_elf32_m88k_vec; +extern bfd_target bfd_elf32_sparc_vec; +extern bfd_target bfd_elf64_big_generic_vec; +extern bfd_target bfd_elf64_little_generic_vec; +extern bfd_target demo_64_vec; +extern bfd_target ecoff_big_vec; +extern bfd_target ecoff_little_vec; +extern bfd_target ecoffalpha_little_vec; +extern bfd_target h8300coff_vec; +extern bfd_target h8500coff_vec; +extern bfd_target host_aout_vec; +extern bfd_target hp300bsd_vec; +extern bfd_target hp300hpux_vec; +extern bfd_target hppa_vec; +extern bfd_target i386aout_vec; +extern bfd_target i386bsd_vec; +extern bfd_target netbsd386_vec; +extern bfd_target freebsd386_vec; +extern bfd_target i386coff_vec; +extern bfd_target i386linux_vec; +extern bfd_target i386lynx_aout_vec; +extern bfd_target i386lynx_coff_vec; +extern bfd_target icoff_big_vec; +extern bfd_target icoff_little_vec; +extern bfd_target ieee_vec; +extern bfd_target m68kcoff_vec; +extern bfd_target m68kcoffun_vec; +extern bfd_target m68klynx_aout_vec; +extern bfd_target m68klynx_coff_vec; +extern bfd_target m88kbcs_vec; +extern bfd_target newsos3_vec; +extern bfd_target nlm32_big_generic_vec; +extern bfd_target nlm32_i386_vec; +extern bfd_target nlm32_little_generic_vec; +extern bfd_target nlm64_big_generic_vec; +extern bfd_target nlm64_little_generic_vec; +extern bfd_target oasys_vec; +extern bfd_target rs6000coff_vec; +extern bfd_target shcoff_vec; +extern bfd_target sunos_big_vec; +extern bfd_target tekhex_vec; +extern bfd_target we32kcoff_vec; +extern bfd_target z8kcoff_vec; + +/* srec is always included. */ +extern bfd_target srec_vec; +extern bfd_target symbolsrec_vec; + +/* All of the xvecs for core files. */ +extern bfd_target aix386_core_vec; +extern bfd_target hpux_core_vec; +extern bfd_target osf_core_vec; +extern bfd_target sco_core_vec; +extern bfd_target trad_core_vec; + +bfd_target *target_vector[] = { + +#ifdef SELECT_VECS + + SELECT_VECS, + +#else /* not SELECT_VECS */ + +#ifdef DEFAULT_VECTOR + &DEFAULT_VECTOR, +#endif + /* This list is alphabetized to make it easy to compare + with other vector lists -- the decls above and + the case statement in configure.in. + Vectors that don't compile on all systems, or aren't finished, + should have an entry here with #if 0 around it, to show that + it wasn't omitted by mistake. */ + &a29kcoff_big_vec, + &a_out_adobe_vec, +#if 0 /* No one seems to use this. */ + &aout_mips_big_vec, +#endif + &aout_mips_little_vec, + &b_out_vec_big_host, + &b_out_vec_little_host, +#if 0 /* No one seems to use this. */ + &bfd_elf32_big_generic_vec, + &bfd_elf32_bigmips_vec, +#endif +#if 0 + &bfd_elf32_hppa_vec, +#endif + &bfd_elf32_i386_vec, + &bfd_elf32_i860_vec, +#if 0 /* No one seems to use this. */ + &bfd_elf32_little_generic_vec, + &bfd_elf32_littlemips_vec, +#endif + &bfd_elf32_m68k_vec, + &bfd_elf32_m88k_vec, + &bfd_elf32_sparc_vec, +#ifdef BFD64 /* No one seems to use this. */ + &bfd_elf64_big_generic_vec, + &bfd_elf64_little_generic_vec, +#endif +#ifdef BFD64 + &demo_64_vec, /* Only compiled if host has long-long support */ +#endif + &ecoff_big_vec, + &ecoff_little_vec, +#if 0 + &ecoffalpha_little_vec, +#endif + &h8300coff_vec, + &h8500coff_vec, +#if 0 + &host_aout_vec, +#endif +#if 0 /* Clashes with sunos_big_vec magic no. */ + &hp300bsd_vec, +#endif + &hp300hpux_vec, +#if defined (HOST_HPPAHPUX) || defined (HOST_HPPABSD) + &hppa_vec, +#endif + &i386aout_vec, + &i386bsd_vec, + &netbsd386_vec, + &freebsd386_vec, + &i386coff_vec, +#if 0 + &i386linux_vec, +#endif + &i386lynx_aout_vec, + &i386lynx_coff_vec, + &icoff_big_vec, + &icoff_little_vec, + &ieee_vec, + &m68kcoff_vec, + &m68kcoffun_vec, + &m68klynx_aout_vec, + &m68klynx_coff_vec, + &m88kbcs_vec, + &newsos3_vec, +#if 0 /* No one seems to use this. */ + &nlm32_big_generic_vec, +#endif + &nlm32_i386_vec, +#if 0 /* No one seems to use this. */ + &nlm32_little_generic_vec, +#endif +#ifdef BFD64 + &nlm64_big_generic_vec, + &nlm64_little_generic_vec, +#endif +#if 0 + /* We have no oasys tools anymore, so we can't test any of this + anymore. If you want to test the stuff yourself, go ahead... + steve@cygnus.com + Worse, since there is no magic number for archives, there + can be annoying target mis-matches. */ + &oasys_vec, +#endif + &rs6000coff_vec, + &shcoff_vec, + &sunos_big_vec, +#if 0 + &tekhex_vec, +#endif + &we32kcoff_vec, + &z8kcoff_vec, + +#endif /* not SELECT_VECS */ + +/* Always support S-records, for convenience. */ + &srec_vec, + &symbolsrec_vec, + +/* Add any required traditional-core-file-handler. */ + +#ifdef AIX386_CORE + &aix386_core_vec, +#endif +#ifdef HPUX_CORE + &hpux_core_vec, +#endif +#ifdef OSF_CORE + &osf_core_vec, +#endif +#ifdef SCO_CORE + &sco_core_vec, +#endif +#ifdef TRAD_CORE + &trad_core_vec, +#endif + + 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 + NULL +}; + + + + +/* +FUNCTION + bfd_find_target + +DESCRIPTION + 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 thenthe 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. + +SYNOPSIS + 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 : + (CONST char *) 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; +} + + +/* +FUNCTION + bfd_target_list + +DESCRIPTION + This function returns a freshly malloced NULL-terminated + vector of the names of all the valid BFD targets. Do not + modify the names + +SYNOPSIS + CONST char **bfd_target_list(void); + +*/ + +CONST char ** +DEFUN_VOID(bfd_target_list) +{ + int vec_length= 0; +#ifdef NATIVE_HPPAHPUX_COMPILER + /* The native compiler on the HP9000/700 has a bug which causes it + to loop endlessly when compiling this file. This avoids it. */ + volatile +#endif + 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; +} |