From: Steve Chamberlain Date: Sat, 30 Nov 1991 21:41:22 +0000 (+0000) Subject: New documentation style X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=9fda1a399cb205730f28edd0b9b61c4c774a3ce2;p=deliverable%2Fbinutils-gdb.git New documentation style --- diff --git a/bfd/archures.c b/bfd/archures.c index 9141d5e130..ffc1dd2428 100644 --- a/bfd/archures.c +++ b/bfd/archures.c @@ -19,81 +19,88 @@ 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. */ -/*doc* -@section Architectures -BFD's idea of an architecture is implimented in @code{archures.c}. BFD -keeps one atom in a BFD describing the architecture of the data -attached to the BFD; a pointer to a @code{bfd_arch_info_type}. - -Pointers to structures can be requested independently of a bfd so that -an architecture's information can be interrogated without access to an -open bfd. - -The arch information is provided by each architecture package. The -set of default architectures is selected by the #define -@code{SELECT_ARCHITECTURES}. This is normally set up in the -@code{config\/h\-} file of your choice. If the name is not defined, -then all the architectures supported are included. - -When BFD starts up, all the architectures are called with an -initialize method. It is up to the architecture back end to insert as -many items into the list of arches as it wants to, generally this -would be one for each machine and one for the default case (an item -with a machine field of 0). +/* +SECTION + Architectures + +DESCRIPTION + + BFD's idea of an architecture is implimented in + <>. BFD keeps one atom in a BFD describing the + architecture of the data attached to the BFD; a pointer to a + <>. + + Pointers to structures can be requested independently of a bfd + so that an architecture's information can be interrogated + without access to an open bfd. + + The arch information is provided by each architecture package. + The set of default architectures is selected by the #define + <>. This is normally set up in the + <> file of your choice. If the name is not + defined, then all the architectures supported are included. + + When BFD starts up, all the architectures are called with an + initialize method. It is up to the architecture back end to + insert as many items into the list of arches as it wants to, + generally this would be one for each machine and one for the + default case (an item with a machine field of 0). */ -/*proto* bfd_architecture -This enum gives the object file's CPU -architecture, in a global sense. E.g. what processor family does it -belong to? There is another field, which indicates what processor -within the family is in use. The machine gives a number which -distingushes different versions of the architecture, containing for -example 2 and 3 for Intel i960 KA and i960 KB, and 68020 and 68030 for -Motorola 68020 and 68030. - -*+ -enum bfd_architecture -{ - bfd_arch_unknown, {* File arch not known *} - bfd_arch_obscure, {* Arch known, not one of these *} - bfd_arch_m68k, {* Motorola 68xxx *} - bfd_arch_vax, {* DEC Vax *} - bfd_arch_i960, {* Intel 960 *} - {* The order of the following is important. - lower number indicates a machine type that - only accepts a subset of the instructions - available to machines with higher numbers. - The exception is the "ca", which is - incompatible with all other machines except - "core". *} - -#define bfd_mach_i960_core 1 -#define bfd_mach_i960_ka_sa 2 -#define bfd_mach_i960_kb_sb 3 -#define bfd_mach_i960_mc 4 -#define bfd_mach_i960_xa 5 -#define bfd_mach_i960_ca 6 - - bfd_arch_a29k, {* AMD 29000 *} - bfd_arch_sparc, {* SPARC *} - bfd_arch_mips, {* MIPS Rxxxx *} - bfd_arch_i386, {* Intel 386 *} - bfd_arch_ns32k, {* National Semiconductor 32xxx *} - bfd_arch_tahoe, {* CCI/Harris Tahoe *} - bfd_arch_i860, {* Intel 860 *} - bfd_arch_romp, {* IBM ROMP PC/RT *} - bfd_arch_alliant, {* Alliant *} - bfd_arch_convex, {* Convex *} - bfd_arch_m88k, {* Motorola 88xxx *} - bfd_arch_pyramid, {* Pyramid Technology *} - bfd_arch_h8300, {* Hitachi H8/300 *} - bfd_arch_rs6000, {* IBM RS/6000 *} - bfd_arch_last - }; -*- +/* + +SUBSECTION + bfd_architecture + +DESCRIPTION + This enum gives the object file's CPU architecture, in a + global sense. E.g. what processor family does it belong to? + There is another field, which indicates what processor within + the family is in use. The machine gives a number which + distingushes different versions of the architecture, + containing for example 2 and 3 for Intel i960 KA and i960 KB, + and 68020 and 68030 for Motorola 68020 and 68030. + +.enum bfd_architecture +.{ +. bfd_arch_unknown, {* File arch not known *} +. bfd_arch_obscure, {* Arch known, not one of these *} +. bfd_arch_m68k, {* Motorola 68xxx *} +. bfd_arch_vax, {* DEC Vax *} +. bfd_arch_i960, {* Intel 960 *} +. {* The order of the following is important. +. lower number indicates a machine type that +. only accepts a subset of the instructions +. available to machines with higher numbers. +. The exception is the "ca", which is +. incompatible with all other machines except +. "core". *} +. +.#define bfd_mach_i960_core 1 +.#define bfd_mach_i960_ka_sa 2 +.#define bfd_mach_i960_kb_sb 3 +.#define bfd_mach_i960_mc 4 +.#define bfd_mach_i960_xa 5 +.#define bfd_mach_i960_ca 6 +. +. bfd_arch_a29k, {* AMD 29000 *} +. bfd_arch_sparc, {* SPARC *} +. bfd_arch_mips, {* MIPS Rxxxx *} +. bfd_arch_i386, {* Intel 386 *} +. bfd_arch_ns32k, {* National Semiconductor 32xxx *} +. bfd_arch_tahoe, {* CCI/Harris Tahoe *} +. bfd_arch_i860, {* Intel 860 *} +. bfd_arch_romp, {* IBM ROMP PC/RT *} +. bfd_arch_alliant, {* Alliant *} +. bfd_arch_convex, {* Convex *} +. bfd_arch_m88k, {* Motorola 88xxx *} +. bfd_arch_pyramid, {* Pyramid Technology *} +. bfd_arch_h8300, {* Hitachi H8/300 *} +. bfd_arch_rs6000, {* IBM RS/6000 *} +. bfd_arch_last +. }; -stuff */ @@ -105,49 +112,58 @@ stuff #include "sysdep.h" #include "libbfd.h" -/*proto* bfd_arch_info -This structure contains information on architectures. -*+ -typedef int bfd_reloc_code_type; - -typedef struct bfd_arch_info -{ - int bits_per_word; - int bits_per_address; - int bits_per_byte; - enum bfd_architecture arch; - long mach; - char *arch_name; - CONST char *printable_name; -{* true if this is the default machine for the architecture *} - boolean the_default; - CONST struct bfd_arch_info * EXFUN((*compatible),(CONST struct bfd_arch_info *a, - CONST struct bfd_arch_info *b)); - - boolean EXFUN((*scan),(CONST struct bfd_arch_info *,CONST char *)); - unsigned int EXFUN((*disassemble),(bfd_vma addr, CONST char *data, - PTR stream)); - CONST struct reloc_howto_struct *EXFUN((*reloc_type_lookup), (CONST struct - bfd_arch_info *, - bfd_reloc_code_type code)); - - struct bfd_arch_info *next; - -} bfd_arch_info_type; - - -*- +/* + +SUBSECTION + bfd_arch_info + +DESCRIPTION + This structure contains information on architectures for use + within BFD. + +.typedef int bfd_reloc_code_type; +. +.typedef struct bfd_arch_info +.{ +. int bits_per_word; +. int bits_per_address; +. int bits_per_byte; +. enum bfd_architecture arch; +. long mach; +. char *arch_name; +. CONST char *printable_name; +.{* true if this is the default machine for the architecture *} +. boolean the_default; +. CONST struct bfd_arch_info * EXFUN((*compatible), +. (CONST struct bfd_arch_info *a, +. CONST struct bfd_arch_info *b)); +. +. boolean EXFUN((*scan),(CONST struct bfd_arch_info *,CONST char *)); +. unsigned int EXFUN((*disassemble),(bfd_vma addr, CONST char *data, +. PTR stream)); +. CONST struct reloc_howto_struct *EXFUN((*reloc_type_lookup), +. (CONST struct bfd_arch_info *, +. bfd_reloc_code_type code)); +. +. struct bfd_arch_info *next; +. +.} bfd_arch_info_type; */ bfd_arch_info_type *bfd_arch_info_list; -/*proto* bfd_printable_name +/* + +FUNCTION + bfd_printable_name -Return a printable string representing the architecture and machine -from the pointer to the arch info structure +DESCRIPTION + Return a printable string representing the architecture and machine + from the pointer to the arch info structure -*; CONST char *EXFUN(bfd_printable_name,(bfd *abfd)); +SYNOPSIS + CONST char *bfd_printable_name(bfd *abfd); */ @@ -160,14 +176,18 @@ DEFUN(bfd_printable_name, (abfd), -/*proto* -*i bfd_scan_arch -This routine is provided with a string and tries to work out if bfd -supports any cpu which could be described with the name provided. The -routine returns a pointer to an arch_info structure if a machine is -found, otherwise NULL. +/* +FUNCTION + bfd_scan_arch -*; bfd_arch_info_type *EXFUN(bfd_scan_arch,(CONST char *)); +DESCRIPTION + This routine is provided with a string and tries to work out + if bfd supports any cpu which could be described with the name + provided. The routine returns a pointer to an arch_info + structure if a machine is found, otherwise NULL. + +SYNOPSIS + bfd_arch_info_type *bfd_scan_arch(CONST char *); */ bfd_arch_info_type * @@ -189,16 +209,23 @@ DEFUN(bfd_scan_arch,(string), -/*proto* bfd_arch_get_compatible -This routine is used to determine whether two BFDs' architectures and -machine types are compatible. It calculates the lowest common -denominator between the two architectures and machine types implied by -the BFDs and returns a pointer to an arch_info structure describing -the compatible machine. +/* +FUNCTION + bfd_arch_get_compatible + +DESCRIPTION -*; CONST bfd_arch_info_type *EXFUN(bfd_arch_get_compatible, - (CONST bfd *abfd, - CONST bfd *bbfd)); + This routine is used to determine whether two BFDs' + architectures and achine types are compatible. It calculates + the lowest common denominator between the two architectures + and machine types implied by the BFDs and returns a pointer to + an arch_info structure describing the compatible machine. + + +SYNOPSIS + CONST bfd_arch_info_type *bfd_arch_get_compatible( + CONST bfd *abfd, + CONST bfd *bbfd); */ CONST bfd_arch_info_type * @@ -211,25 +238,36 @@ CONST bfd *bbfd) } -/*proto-internal* bfd_default_arch_struct +/* +INTERNAL + +SUBSECTION + bfd_default_arch_struct -What bfds are seeded with +DESCRIPTION + What bfds are seeded with + + +.extern bfd_arch_info_type bfd_default_arch_struct; -*+ -extern bfd_arch_info_type bfd_default_arch_struct; -*- */ bfd_arch_info_type bfd_default_arch_struct = - { +{ 32,32,8,bfd_arch_unknown,0,"unknown","unknown",true, - bfd_default_compatible, bfd_default_scan, + bfd_default_compatible, + bfd_default_scan, + 0, + bfd_default_reloc_type_lookup - }; +}; -/*proto* bfd_set_arch_info +/* +FUNCTION + bfd_set_arch_info -*; void EXFUN(bfd_set_arch_info,(bfd *, bfd_arch_info_type *)); +SYNOPSIS + void bfd_set_arch_info(bfd *, bfd_arch_info_type *); */ @@ -240,14 +278,20 @@ bfd_arch_info_type *arg) abfd->arch_info = arg; } -/*proto-internal* bfd_default_set_arch_mach +/* +INTERNAL FUNCTION + bfd_default_set_arch_mach + +DESCRIPTION + Set the architecture and machine type in a bfd. This finds the + correct pointer to structure and inserts it into the arch_info + pointer. -Set the architecture and machine type in a bfd. This finds the correct -pointer to structure and inserts it into the arch_info pointer. -*; boolean EXFUN(bfd_default_set_arch_mach,(bfd *abfd, - enum bfd_architecture arch, - unsigned long mach)); +SYNOPSIS + boolean bfd_default_set_arch_mach(bfd *abfd, + enum bfd_architecture arch, + unsigned long mach); */ @@ -293,39 +337,50 @@ boolean DEFUN(bfd_default_set_arch_mach,(abfd, arch, mach), -/*proto* bfd_get_arch +/* +FUNCTION + bfd_get_arch -Returns the enumerated type which describes the supplied bfd's -architecture +DESCRIPTION + Returns the enumerated type which describes the supplied bfd's + architecture -*; enum bfd_architecture EXFUN(bfd_get_arch, (bfd *abfd)); +SYNOPSIS + enum bfd_architecture bfd_get_arch(bfd *abfd); */ - enum bfd_architecture DEFUN(bfd_get_arch, (abfd), bfd *abfd) - { +enum bfd_architecture DEFUN(bfd_get_arch, (abfd), bfd *abfd) +{ return abfd->arch_info->arch; +} +/* +FUNCTION + bfd_get_mach - } - -/*proto* bfd_get_mach - -Returns the long type which describes the supplied bfd's -machine +DESCRIPTION + Returns the long type which describes the supplied bfd's + machine -*; unsigned long EXFUN(bfd_get_mach, (bfd *abfd)); +SYNOPSIS + unsigned long bfd_get_mach(bfd *abfd); */ -unsigned long DEFUN(bfd_get_mach, (abfd), bfd *abfd) +unsigned long +DEFUN(bfd_get_mach, (abfd), bfd *abfd) { return abfd->arch_info->mach; - } +} -/*proto* bfd_arch_bits_per_byte +/* +FUNCTION + bfd_arch_bits_per_byte -Returns the number of bits in one of the architectures bytes +DESCRIPTION + Returns the number of bits in one of the architectures bytes -*; unsigned int EXFUN(bfd_arch_bits_per_byte, (bfd *abfd)); +SYNOPSIS + unsigned int bfd_arch_bits_per_byte(bfd *abfd); */ unsigned int DEFUN(bfd_arch_bits_per_byte, (abfd), bfd *abfd) @@ -333,11 +388,15 @@ unsigned int DEFUN(bfd_arch_bits_per_byte, (abfd), bfd *abfd) return abfd->arch_info->bits_per_byte; } -/*proto* bfd_arch_bits_per_address +/* +FUNCTION + bfd_arch_bits_per_address -Returns the number of bits in one of the architectures addresses +DESCRIPTION + Returns the number of bits in one of the architectures addresses -*; unsigned int EXFUN(bfd_arch_bits_per_address, (bfd *abfd)); +SYNOPSIS + unsigned int bfd_arch_bits_per_address(bfd *abfd); */ unsigned int DEFUN(bfd_arch_bits_per_address, (abfd), bfd *abfd) @@ -382,33 +441,42 @@ static void EXFUN((*archures_init_table[]),()) = -/*proto-internal* +/* +INTERNAL FUNCTION + bfd_arch_init -This routine initializes the architecture dispatch table by calling -all installed architecture packages and getting them to poke around. +DESCRIPTION + This routine initializes the architecture dispatch table by + calling all installed architecture packages and getting them + to poke around. -*; PROTO(void, bfd_arch_init,(void)); +SYNOPSIS + void bfd_arch_init(void); */ void DEFUN_VOID(bfd_arch_init) { - void EXFUN((**ptable),()); - for (ptable = archures_init_table; - *ptable ; - ptable++) - { + void EXFUN((**ptable),()); + for (ptable = archures_init_table; + *ptable ; + ptable++) + { (*ptable)(); - } + } } -/*proto-internal* bfd_arch_linkin +/* +INTERNAL FUNCTION + bfd_arch_linkin -Link the provided arch info structure into the list +DESCRIPTION + Link the provided arch info structure into the list -*; void EXFUN(bfd_arch_linkin,(bfd_arch_info_type *)); +SYNOPSIS + void bfd_arch_linkin(bfd_arch_info_type *); */ @@ -420,13 +488,17 @@ void DEFUN(bfd_arch_linkin,(ptr), } -/*proto-internal* bfd_default_compatible +/* +INTERNAL FUNCTION + bfd_default_compatible -The default function for testing for compatibility +DESCRIPTION + The default function for testing for compatibility. -*; CONST bfd_arch_info_type *EXFUN(bfd_default_compatible, - (CONST bfd_arch_info_type *a, - CONST bfd_arch_info_type *b)); +SYNOPSIS + CONST bfd_arch_info_type *bfd_default_compatible + (CONST bfd_arch_info_type *a, + CONST bfd_arch_info_type *b); */ CONST bfd_arch_info_type * @@ -445,11 +517,17 @@ DEFUN(bfd_default_compatible,(a,b), return a; } -/*proto-internal* bfd_default_scan -The default function for working out whether this is an architecture -hit and a machine hit -*; boolean EXFUN(bfd_default_scan,(CONST struct bfd_arch_info *, CONST char *)); +/* +INTERNAL FUNCTION + bfd_default_scan + +DESCRIPTION + The default function for working out whether this is an + architecture hit and a machine hit. + +SYNOPSIS + boolean bfd_default_scan(CONST struct bfd_arch_info *, CONST char *); */ @@ -458,98 +536,103 @@ DEFUN(bfd_default_scan,(info, string), CONST struct bfd_arch_info *info AND CONST char *string) { - CONST char *ptr_src; - CONST char *ptr_tst; - unsigned long number; - enum bfd_architecture arch; - /* First test for an exact match */ - if (strcmp(string, info->printable_name) == 0) return true; - - /* See how much of the supplied string matches with the - architecture, eg the string m68k:68020 would match the 68k entry - up to the :, then we get left with the machine number */ - - for (ptr_src = string, - ptr_tst = info->arch_name; - *ptr_src && *ptr_tst; - ptr_src++, - ptr_tst++) - { + CONST char *ptr_src; + CONST char *ptr_tst; + unsigned long number; + enum bfd_architecture arch; + /* First test for an exact match */ + if (strcmp(string, info->printable_name) == 0) return true; + + /* See how much of the supplied string matches with the + architecture, eg the string m68k:68020 would match the 68k entry + up to the :, then we get left with the machine number */ + + for (ptr_src = string, + ptr_tst = info->arch_name; + *ptr_src && *ptr_tst; + ptr_src++, + ptr_tst++) + { if (*ptr_src != *ptr_tst) break; - } + } - /* Chewed up as much of the architecture as will match, skip any - colons */ - if (*ptr_src == ':') ptr_src++; + /* Chewed up as much of the architecture as will match, skip any + colons */ + if (*ptr_src == ':') ptr_src++; - if (*ptr_src == 0) { - /* nothing more, then only keep this one if it is the default - machine for this architecture */ - return info->the_default; - } - number = 0; - while (isdigit(*ptr_src)) { - number = number * 10 + *ptr_src - '0'; - ptr_src++; - } + if (*ptr_src == 0) { + /* nothing more, then only keep this one if it is the default + machine for this architecture */ + return info->the_default; + } + number = 0; + while (isdigit(*ptr_src)) { + number = number * 10 + *ptr_src - '0'; + ptr_src++; + } + + switch (number) + { + case 68010: + case 68020: + case 68030: + case 68040: + case 68332: + case 68050: + case 68000: + arch = bfd_arch_m68k; + break; + case 386: + case 80386: + case 486: + arch = bfd_arch_i386; + break; + case 29000: + arch = bfd_arch_a29k; + break; - switch (number) { - case 68010: - case 68020: - case 68030: - case 68040: - case 68332: - case 68050: - case 68000: - arch = bfd_arch_m68k; - break; - case 386: - case 80386: - case 486: - arch = bfd_arch_i386; - break; - case 29000: - arch = bfd_arch_a29k; - break; - - case 32016: - case 32032: - case 32132: - case 32232: - case 32332: - case 32432: - case 32532: - case 32000: - arch = bfd_arch_ns32k; - break; - - case 860: - case 80860: - arch = bfd_arch_i860; - break; - - case 6000: - arch = bfd_arch_rs6000; - break; - - default: - return false; - } - if (arch != info->arch) - return false; + case 32016: + case 32032: + case 32132: + case 32232: + case 32332: + case 32432: + case 32532: + case 32000: + arch = bfd_arch_ns32k; + break; - if (number != info->mach) - return false; + case 860: + case 80860: + arch = bfd_arch_i860; + break; - return true; + case 6000: + arch = bfd_arch_rs6000; + break; + + default: + return false; + } + if (arch != info->arch) + return false; + + if (number != info->mach) + return false; + + return true; } -/*proto* bfd_get_arch_info +/* +FUNCTION + bfd_get_arch_info -*; bfd_arch_info_type * EXFUN(bfd_get_arch_info,(bfd *)); + +SYNOPSIS + bfd_arch_info_type * bfd_get_arch_info(bfd *); */ @@ -561,14 +644,24 @@ bfd *abfd) } -/*proto* bfd_lookup_arch +/* +FUNCTION + bfd_lookup_arch + +DESCRIPTION + + Look for the architecure info struct which matches the + arguments given. A machine of 0 will match the + machine/architecture structure which marks itself as the + default. + -*; bfd_arch_info_type * EXFUN(bfd_lookup_arch,(enum - bfd_architecture arch,long machine)); +SYNOPSIS + bfd_arch_info_type *bfd_lookup_arch + (enum bfd_architecture + arch, + long machine); -Look for the architecure info struct which matches the arguments -given. A machine of 0 will match the machine/architecture structure which -marks itself as the default. */ @@ -577,29 +670,35 @@ DEFUN(bfd_lookup_arch,(arch, machine), enum bfd_architecture arch AND long machine) { - bfd_arch_info_type *ap; - bfd_check_init(); - for (ap = bfd_arch_info_list; - ap != (bfd_arch_info_type *)NULL; - ap = ap->next) { - if (ap->arch == arch && - ((ap->mach == machine) || (ap->the_default && machine == 0))) { - return ap; - } - } - return (bfd_arch_info_type *)NULL; + bfd_arch_info_type *ap; + bfd_check_init(); + for (ap = bfd_arch_info_list; + ap != (bfd_arch_info_type *)NULL; + ap = ap->next) { + if (ap->arch == arch && + ((ap->mach == machine) + || (ap->the_default && machine == 0))) { + return ap; + } + } + return (bfd_arch_info_type *)NULL; } -/*proto* bfd_printable_arch_mach -Return a printable string representing the architecture and machine -type. +/* +FUNCTION + bfd_printable_arch_mach + +DESCRIPTION + Return a printable string representing the architecture and + machine type. -NB. The use of this routine is depreciated. + NB. The use of this routine is depreciated. -*; PROTO(CONST char *,bfd_printable_arch_mach, - (enum bfd_architecture arch, unsigned long machine)); +SYNOPSIS + CONST char * bfd_printable_arch_mach + (enum bfd_architecture arch, unsigned long machine); */ CONST char * @@ -607,7 +706,7 @@ DEFUN(bfd_printable_arch_mach,(arch, machine), enum bfd_architecture arch AND unsigned long machine) { - bfd_arch_info_type *ap = bfd_lookup_arch(arch, machine); - if(ap) return ap->printable_name; - return "UNKNOWN!"; + bfd_arch_info_type *ap = bfd_lookup_arch(arch, machine); + if(ap) return ap->printable_name; + return "UNKNOWN!"; } diff --git a/bfd/coffcode.h b/bfd/coffcode.h index 1edcd2ff8e..01a2ffa76a 100644 --- a/bfd/coffcode.h +++ b/bfd/coffcode.h @@ -18,231 +18,249 @@ 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. */ -/*doc* -@section coff backends - -BFD supports a number of different flavours of coff format. The major -difference between formats are the sizes and alignments of fields in -structures on disk, and the occasional extra field. - -Coff in all its varieties is implimented with a few common files and a -number of implementation specific files. For example, The 88k bcs coff -format is implemented in the file @code{coff-m88k.c}. This file -@code{#include}s @code{coff-m88k.h} which defines the external -structure of the coff format for the 88k, and @code{internalcoff.h} -which defines the internal structure. @code{coff-m88k.c} also defines -the relocations used by the 88k format @xref{Relocations}. Then the -major portion of coff code is included (@code{coffcode.h}) which -defines the methods used to act upon the types defined in -@code{coff-m88k.h} and @code{internalcoff.h}. - -The Intel i960 processor version of coff is implemented in -@code{coff-i960.c}. This file has the same structure as -@code{coff-m88k.c}, except that it includes @code{coff-i960.h} rather -than @code{coff-m88k.h}. - -@subsection Porting To A New Version of Coff - -The recommended method is to select from the existing implimentations -the version of coff which is most like the one you want to use, for -our purposes, we'll say that i386 coff is the one you select, and that -your coff flavour is called foo. Copy the @code{i386coff.c} to @code{foocoff.c}, -copy @code{../include/i386coff.h} to @code{../include/foocoff.h} and -add the lines to @code{targets.c} and @code{Makefile.in} so that your -new back end is used. - -Alter the shapes of the structures in @code{../include/foocoff.h} so -that they match what you need. You will probably also have to add -@code{#ifdef}s to the code in @code{internalcoff.h} and -@code{coffcode.h} if your version of coff is too wild. - -You can verify that your new BFD backend works quite simply by -building @code{objdump} from the @code{binutils} directory, and -making sure that its version of what's going on at your host systems -idea (assuming it has the pretty standard coff dump utility (usually -called @code{att-dump} or just @code{dump})) are the same. - -Then clean up your code, and send what you've done to Cygnus. Then your stuff -will be in the next release, and you won't have to keep integrating -it. - -@subsection How The Coff Backend Works - -@subsubsection Bit Twiddling -Each flavour of coff supported in BFD has its own header file -descibing the external layout of the structures. There is also an -internal description of the coff layout (in @code{internalcoff.h}) -file (@code{}). A major function of the coff backend is swapping the -bytes and twiddling the bits to translate the external form of the -structures into the normal internal form. This is all performed in the -@code{bfd_swap}_@i{thing}_@i{direction} routines. Some elements are -different sizes between different versions of coff, it is the duty of -the coff version specific include file to override the definitions of -various packing routines in @code{coffcode.h}. Eg the size of line -number entry in coff is sometimes 16 bits, and sometimes 32 bits. -@code{#define}ing @code{PUT_LNSZ_LNNO} and @code{GET_LNSZ_LNNO} will -select the correct one. No doubt, some day someone will find a version -of coff which has a varying field size not catered for at the moment. -To port BFD, that person will have to add more @code{#defines}. - -Three of the bit twiddling routines are exported to @code{gdb}; -@code{coff_swap_aux_in}, @code{coff_swap_sym_in} and -@code{coff_swap_linno_in}. @code{GDB} reads the symbol table on its -own, but uses BFD to fix things up. - -More of the bit twiddlers are exported for @code{gas}; -@code{coff_swap_aux_out}, @code{coff_swap_sym_out}, -@code{coff_swap_lineno_out}, @code{coff_swap_reloc_out}, -@code{coff_swap_filehdr_out}, @code{coff_swap_aouthdr_out}, -@code{coff_swap_scnhdr_out}. @code{Gas} currently keeps track of all -the symbol table and reloc drudgery itself, thereby saving the -internal BFD overhead, but uses BFD to swap things on the way out, -making cross ports much safer. This also allows BFD (and thus the -linker) to use the same header files as @code{gas}, which makes one -avenue to disaster disappear. - -@subsubsection Symbol Reading -The simple canonical form for symbols used by BFD is not rich enough -to keep all the information available in a coff symbol table. The back -end gets around this by keeping the original symbol table around, -"behind the scenes". - -When a symbol table is requested (through a call to -@code{bfd_canonicalize_symtab}, a request gets through to -@code{get_normalized_symtab}. This reads the symbol table from the -coff file and swaps all the structures inside into the internal form. -It also fixes up all the pointers in the table (represented in the file -by offsets from the first symbol in the table) into physical pointers -to elements in the new internal table. This involves some work since -the meanings of fields changes depending upon context; a field that is a -pointer to another structure in the symbol table at one moment may be -the size in bytes of a structure in the next. - -Another pass is made over the table. All symbols which mark file names -(@code{C_FILE} symbols) are modified so that the internal string -points to the value in the auxent (the real filename) rather than the -normal text associated with the symbol (@code{".file"}). - -At this time the symbol names are moved around. Coff stores all -symbols less than nine characters long physically within the symbol -table, longer strings are kept at the end of the file in the string -table. This pass moves all strings into memory, and replaces them with -pointers to the strings. - -The symbol table is massaged once again, this time to create the -canonical table used by the BFD application. Each symbol is inspected -in turn, and a decision made (using the @code{sclass} field) about the -various flags to set in the @code{asymbol} @xref{Symbols}. The -generated canonical table shares strings with the hidden internal -symbol table. - -Any linenumbers are read from the coff file too, and attached to the -symbols which own the functions the linenumbers belong to. - -@subsubsection Symbol Writing -Writing a symbol to a coff file which didn't come from a coff file -will lose any debugging information. The @code{asymbol} structure -remembers the BFD from which was born, and on output the back end -makes sure that the same destination target as source target is -present. - -When the symbols have come from a coff file then all the debugging -information is preserved. - -Symbol tables are provided for writing to the back end in a vector of -pointers to pointers. This allows applications like the linker to -accumulate and output large symbol tables without having to do too -much byte copying. - -The symbol table is not output to a writable BFD until it is closed. -The order of operations on the canonical symbol table at that point -are: -@table @code -@item coff_renumber_symbols -This function runs through the provided symbol table and patches each -symbol marked as a file place holder (@code{C_FILE}) to point to the -next file place holder in the list. It also marks each @code{offset} -field in the list with the offset from the first symbol of the current -symbol. - -Another function of this procedure is to turn the canonical value form -of BFD into the form used by coff. Internally, BFD expects symbol -values to be offsets from a section base; so a symbol physically at -0x120, but in a section starting at 0x100, would have the value 0x20. -Coff expects symbols to contain their final value, so symbols have -their values changed at this point to reflect their sum with their -owning section. Note that this transformation uses the -@code{output_section} field of the @code{asymbol}'s @code{asection} -@xref{Sections}. -@item coff_mangle_symbols -This routine runs though the provided symbol table and uses the -offsets generated by the previous pass and the pointers generated when -the symbol table was read in to create the structured hierachy -required by coff. It changes each pointer to a symbol to an index into -the symbol table of the symbol being referenced. -@item coff_write_symbols -This routine runs through the symbol table and patches up the symbols -from their internal form into the coff way, calls the bit twiddlers -and writes out the tabel to the file. -@end table -*/ +/* -/*proto* +SECTION + coff backends + +DESCRIPTION + BFD supports a number of different flavours of coff format. + The major difference between formats are the sizes and + alignments of fields in structures on disk, and the occasional + extra field. + + Coff in all its varieties is implimented with a few common + files and a number of implementation specific files. For + example, The 88k bcs coff format is implemented in the file + @code{coff-m88k.c}. This file @code{#include}s + @code{coff-m88k.h} which defines the external structure of the + coff format for the 88k, and @code{internalcoff.h} which + defines the internal structure. @code{coff-m88k.c} also + defines pthe relocations used by the 88k format + @xref{Relocations}. Then the major portion of coff code is + included (@code{coffcode.h}) which defines the methods used to + act upon the types defined in @code{coff-m88k.h} and + @code{internalcoff.h}. + + + The Intel i960 processor version of coff is implemented in + @code{coff-i960.c}. This file has the same structure as + @code{coff-m88k.c}, except that it includes @code{coff-i960.h} + rather than @code{coff-m88k.h}. + +SUBSECTION + Porting To A New Version of Coff + +DESCRIPTION + The recommended method is to select from the existing + implimentations the version of coff which is most like the one + you want to use, for our purposes, we'll say that i386 coff is + the one you select, and that your coff flavour is called foo. + Copy the @code{i386coff.c} to @code{foocoff.c}, copy + @code{../include/i386coff.h} to @code{../include/foocoff.h} + and add the lines to @code{targets.c} and @code{Makefile.in} + so that your new back end is used. Alter the shapes of the + structures in @code{../include/foocoff.h} so that they match + what you need. You will probably also have to add + @code{#ifdef}s to the code in @code{internalcoff.h} and + @code{coffcode.h} if your version of coff is too wild. + + You can verify that your new BFD backend works quite simply by + building @code{objdump} from the @code{binutils} directory, + and making sure that its version of what's going on at your + host systems idea (assuming it has the pretty standard coff + dump utility (usually called @code{att-dump} or just + @code{dump})) are the same. Then clean up your code, and send + what you've done to Cygnus. Then your stuff will be in the + next release, and you won't have to keep integrating it. + +SUBSECTION + How The Coff Backend Works + +SUBSUBSECTION + Bit Twiddling + +DESCRIPTION + Each flavour of coff supported in BFD has its own header file + descibing the external layout of the structures. There is also + an internal description of the coff layout (in + @code{internalcoff.h}) file (@code{}). A major function of the + coff backend is swapping the bytes and twiddling the bits to + translate the external form of the structures into the normal + internal form. This is all performed in the + @code{bfd_swap}_@i{thing}_@i{direction} routines. Some + elements are different sizes between different versions of + coff, it is the duty of the coff version specific include file + to override the definitions of various packing routines in + @code{coffcode.h}. Eg the size of line number entry in coff is + sometimes 16 bits, and sometimes 32 bits. @code{#define}ing + @code{PUT_LNSZ_LNNO} and @code{GET_LNSZ_LNNO} will select the + correct one. No doubt, some day someone will find a version of + coff which has a varying field size not catered for at the + moment. To port BFD, that person will have to add more @code{#defines}. + Three of the bit twiddling routines are exported to + @code{gdb}; @code{coff_swap_aux_in}, @code{coff_swap_sym_in} + and @code{coff_swap_linno_in}. @code{GDB} reads the symbol + table on its own, but uses BFD to fix things up. More of the + bit twiddlers are exported for @code{gas}; + @code{coff_swap_aux_out}, @code{coff_swap_sym_out}, + @code{coff_swap_lineno_out}, @code{coff_swap_reloc_out}, + @code{coff_swap_filehdr_out}, @code{coff_swap_aouthdr_out}, + @code{coff_swap_scnhdr_out}. @code{Gas} currently keeps track + of all the symbol table and reloc drudgery itself, thereby + saving the internal BFD overhead, but uses BFD to swap things + on the way out, making cross ports much safer. This also + allows BFD (and thus the linker) to use the same header files + as @code{gas}, which makes one avenue to disaster disappear. + +SUBSUBSECTION + Symbol Reading + +DESCRIPTION + The simple canonical form for symbols used by BFD is not rich + enough to keep all the information available in a coff symbol + table. The back end gets around this by keeping the original + symbol table around, "behind the scenes". + + When a symbol table is requested (through a call to + @code{bfd_canonicalize_symtab}, a request gets through to + @code{get_normalized_symtab}. This reads the symbol table from + the coff file and swaps all the structures inside into the + internal form. It also fixes up all the pointers in the table + (represented in the file by offsets from the first symbol in + the table) into physical pointers to elements in the new + internal table. This involves some work since the meanings of + fields changes depending upon context; a field that is a + pointer to another structure in the symbol table at one moment + may be the size in bytes of a structure in the next. Another + pass is made over the table. All symbols which mark file names + (@code{C_FILE} symbols) are modified so that the internal + string points to the value in the auxent (the real filename) + rather than the normal text associated with the symbol + (@code{".file"}). + + At this time the symbol names are moved around. Coff stores + all symbols less than nine characters long physically + within the symbol table, longer strings are kept at the end of + the file in the string table. This pass moves all strings + into memory, and replaces them with pointers to the strings. + + + The symbol table is massaged once again, this time to create + the canonical table used by the BFD application. Each symbol + is inspected in turn, and a decision made (using the + @code{sclass} field) about the various flags to set in the + @code{asymbol} @xref{Symbols}. The generated canonical table + shares strings with the hidden internal symbol table. + + Any linenumbers are read from the coff file too, and attached + to the symbols which own the functions the linenumbers belong to. + +SUBSUBSECTION + Symbol Writing + + +DESCRIPTION + Writing a symbol to a coff file which didn't come from a coff + file will lose any debugging information. The @code{asymbol} + structure remembers the BFD from which was born, and on output + the back end makes sure that the same destination target as + source target is present. + + When the symbols have come from a coff file then all the + debugging information is preserved. + + Symbol tables are provided for writing to the back end in a + vector of pointers to pointers. This allows applications like + the linker to accumulate and output large symbol tables + without having to do too much byte copying. + + + + This function runs through the provided symbol table and + patches each symbol marked as a file place holder + (@code{C_FILE}) to point to the next file place holder in the + list. It also marks each @code{offset} field in the list with + the offset from the first symbol of the current symbol. + + Another function of this procedure is to turn the canonical + value form of BFD into the form used by coff. Internally, BFD + expects symbol values to be offsets from a section base; so a + symbol physically at 0x120, but in a section starting at + 0x100, would have the value 0x20. Coff expects symbols to + contain their final value, so symbols have their values + changed at this point to reflect their sum with their owning + section. Note that this transformation uses the + <> field of the @code{asymbol}'s + @code{asection} @xref{Sections}. + + o coff_mangle_symbols + This routine runs though the provided symbol table and uses + the offsets generated by the previous pass and the pointers + generated when the symbol table was read in to create the + structured hierachy required by coff. It changes each pointer + to a symbol to an index into the symbol table of the symbol + being referenced. + + o coff_write_symbols + This routine runs through the symbol table and patches up the + symbols from their internal form into the coff way, calls the + bit twiddlers and writes out the tabel to the file. -The hidden information for an asymbol is: +*/ -*+++ +/* +INTERNAL -$ typedef struct coff_ptr_struct -$ { -Remembers the offset from the first symbol in the file for this -symbol. Generated by @code{coff_renumber_symbols}. + The hidden information for an asymbol is described in a + coff_ptr_struct, which is typedefed to a combined_entry_type -$ unsigned int offset; + .typedef struct coff_ptr_struct + .{ -Should the tag field of this symbol be renumbered. -Created by @code{coff_pointerize_aux}. + Remembers the offset from the first symbol in the file for + this symbol. Generated by @code{coff_renumber_symbols}. -$ char fix_tag; + .unsigned int offset; -Should the endidx field of this symbol be renumbered. -Created by @code{coff_pointerize_aux}. + Should the tag field of this symbol be renumbered. + Created by @code{coff_pointerize_aux}. -$ char fix_end; + .char fix_tag; -The container for the symbol structure as read and translated from the file. + Should the endidx field of this symbol be renumbered. + Created by @code{coff_pointerize_aux}. -$ union { -$ union internal_auxent auxent; -$ struct internal_syment syment; -$ } u; -$ } combined_entry_type; -$ + .char fix_end; -*--- + The container for the symbol structure as read and translated + from the file. -Each canonical asymbol really looks like this: + .union { + . union internal_auxent auxent; + . struct internal_syment syment; + . } u; + .} combined_entry_type; -*+++ + Each canonical asymbol really looks like this: -$ typedef struct coff_symbol_struct -$ { + .typedef struct coff_symbol_struct + .{ -The actual symbol which the rest of BFD works with + The actual symbol which the rest of BFD works with -$ asymbol symbol; + .asymbol symbol; -A pointer to the hidden information for this symbol + A pointer to the hidden information for this symbol -$ combined_entry_type *native; + .combined_entry_type *native; -A pointer to the linenumber information for this symbol + A pointer to the linenumber information for this symbol -$ struct lineno_cache_entry *lineno; -$ } coff_symbol_type; + .struct lineno_cache_entry *lineno; + .} coff_symbol_type; -*--- */ @@ -1635,17 +1653,21 @@ DEFUN(coff_write_symbols,(abfd), } } -/*doc* -@subsubsection Writing Relocations -To write a relocations, all the back end does is step though the -canonical relocation table, and create an @code{internal_reloc}. The -symbol index to use is removed from the @code{offset} field in the -symbol table supplied, the address comes directly from the sum of the -section base address and the relocation offset and the type is dug -directly from the howto field. - -Then the @code{internal_reloc} is swapped into the shape of an -@code{external_reloc} and written out to disk. +/* +SUBSUBSECTION + Writing Relocations + +DESCRIPTION + To write relocations, all the back end does is step though the + canonical relocation table, and create an + @code{internal_reloc}. The symbol index to use is removed from + the @code{offset} field in the symbol table supplied, the + address comes directly from the sum of the section base + address and the relocation offset and the type is dug directly + from the howto field. Then the @code{internal_reloc} is + swapped into the shape of an @code{external_reloc} and written + out to disk. + */ static void @@ -2693,21 +2715,25 @@ DEFUN(section_from_bfd_index,(abfd, index), #ifndef NO_COFF_LINENOS -/*doc* -@subsubsection Reading Linenumbers -Createing the linenumber table is done by reading in the entire coff -linenumber table, and creating another table for internal use. +/* +SUBSUBSECTION + Reading Linenumbers + +DESCRIPTION + Creating the linenumber table is done by reading in the entire + coff linenumber table, and creating another table for internal use. -A coff line number table is structured so that each -function is marked as having a line number of 0. Each line within the -function is an offset from the first line in the function. The base of -the line number information for the table is stored in the symbol -associated with the function. + A coff line number table is structured so that each function + is marked as having a line number of 0. Each line within the + function is an offset from the first line in the function. The + base of the line number information for the table is stored in + the symbol associated with the function. -The information is copied from the external to the internal table, and -each symbol which marks a function is marked by pointing its... + The information is copied from the external to the internal + table, and each symbol which marks a function is marked by + pointing its... -**How does this work ?** + How does this work ? */ @@ -3050,31 +3076,34 @@ sec_ptr asect; return (asect->reloc_count + 1) * sizeof(arelent *); } -/*doc* -@subsubsection Reading Relocations -Coff relocations are easily transformed into the internal BFD form -(@code{arelent}). - -Reading a coff relocation table is done in the following stages: -@itemize @bullet -@item -The entire coff relocation table is read into memory. -@item -Each relocation is processed in turn, first it is swapped from the -external to the internal form. -@item -The symbol referenced in the relocation's symbol index is turned into -a pointer into the canonical symbol table. Note that this table is the -same as the one returned by a call to @code{bfd_canonicalize_symtab}. -The back end will call the routine and save the result if a -canonicalization hasn't been done. -@item -The reloc index is turned into a pointer to a howto structure, in a -back end specific way. For instance, the 386 and 960 use the -@code{r_type} to directly produce an index into a howto table vector; -the 88k subtracts a number from the @code{r_type} field and creates an -addend field. -@end itemize +/* +SUBSUBSECTION + Reading Relocations + +DESCRIPTION + Coff relocations are easily transformed into the internal BFD form + (@code{arelent}). + + Reading a coff relocation table is done in the following stages: + + o The entire coff relocation table is read into memory. + + o Each relocation is processed in turn, first it is swapped from the + external to the internal form. + + o The symbol referenced in the relocation's symbol index is + turned intoa pointer into the canonical symbol table. Note + that this table is the same as the one returned by a call to + @code{bfd_canonicalize_symtab}. The back end will call the + routine and save the result if a canonicalization hasn't been done. + + o The reloc index is turned into a pointer to a howto + structure, in a back end specific way. For instance, the 386 + and 960 use the @code{r_type} to directly produce an index + into a howto table vector; the 88k subtracts a number from the + @code{r_type} field and creates an addend field. + + */ #ifndef CALC_ADDEND