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
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
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
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
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
+ (<<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"}).
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 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
@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
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.
*/
/*
-INTERNAL
-
+INTERNAL_DEFINITION
+ coff_symbol_type
+DESCRIPTION
The hidden information for an asymbol is described in a
coff_ptr_struct, which is typedefed to a combined_entry_type
- .typedef struct coff_ptr_struct
- .{
-
- Remembers the offset from the first symbol in the file for
- this symbol. Generated by @code{coff_renumber_symbols}.
-
- .unsigned int offset;
-
- Should the tag field of this symbol be renumbered.
- Created by @code{coff_pointerize_aux}.
-
- .char fix_tag;
-
- Should the endidx field of this symbol be renumbered.
- Created by @code{coff_pointerize_aux}.
-
- .char fix_end;
-
- The container for the symbol structure as read and translated
- from the file.
-
- .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
- .{
-
- The actual symbol which the rest of BFD works with
-
- .asymbol symbol;
-
- A pointer to the hidden information for this symbol
-
- .combined_entry_type *native;
-
- A pointer to the linenumber information for this symbol
-
- .struct lineno_cache_entry *lineno;
- .} coff_symbol_type;
+CODE_FRAGMENT
+.typedef struct coff_ptr_struct
+.{
+.
+. {* Remembers the offset from the first symbol in the file for
+. this symbol. Generated by coff_renumber_symbols. *}
+.unsigned int offset;
+.
+. {* Should the tag field of this symbol be renumbered.
+. Created by coff_pointerize_aux. *}
+.char fix_tag;
+.
+. {* Should the endidx field of this symbol be renumbered.
+. Created by coff_pointerize_aux. *}
+.char fix_end;
+.
+. {* The container for the symbol structure as read and translated
+. from the file. *}
+.
+.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
+.{
+. {* The actual symbol which the rest of BFD works with *}
+.asymbol symbol;
+.
+. {* A pointer to the hidden information for this symbol *}
+.combined_entry_type *native;
+.
+. {* A pointer to the linenumber information for this symbol *}
+.struct lineno_cache_entry *lineno;
+.
+.} coff_symbol_type;
*/
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
fprintf(file, "File ");
break;
default:
- fprintf(file, "AUX tv %x lnno %x size %x",
+ fprintf(file, "AUX lnno %x size %x",
combined[aux+1].u.auxent.x_sym.x_misc.x_lnsz.x_lnno,
combined[aux+1].u.auxent.x_sym.x_misc.x_lnsz.x_size);
break;
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.
SUBSUBSECTION
Reading Relocations
-DESCRIPTION
Coff relocations are easily transformed into the internal BFD form
(@code{arelent}).
for (idx = 0; idx < asect->reloc_count; idx ++)
{
+#ifdef RELOC_PROCESSING
struct internal_reloc dst;
- asymbol *ptr;
struct external_reloc *src;
cache_ptr = reloc_cache + idx;
src = native_relocs + idx;
-
bfd_swap_reloc_in(abfd, src, &dst);
-
-#ifdef RELOC_PROCESSING
RELOC_PROCESSING(cache_ptr, &dst, symbols, abfd, asect);
#else
+ struct internal_reloc dst;
+ asymbol *ptr;
+ struct external_reloc *src;
+
+ cache_ptr = reloc_cache + idx;
+ src = native_relocs + idx;
+
+ bfd_swap_reloc_in(abfd, src, &dst);
+
cache_ptr->address = dst.r_vaddr;
FUNCTION
bfd_core_file_failing_command
+SYNOPSIS
+ CONST char *bfd_core_file_failing_command(bfd *);
+
DESCRIPTION
Returns a read-only string explaining what program was running
when it failed and produced the core file being read
-SYNOPSIS
- CONST char *bfd_core_file_failing_command(bfd *);
*/
CONST char *
FUNCTION
bfd_core_file_failing_signal
+SYNOPSIS
+ int bfd_core_file_failing_signal(bfd *);
+
DESCRIPTION
Returns the signal number which caused the core dump which
generated the file the BFD is attached to.
-
-SYNOPSIS
- int bfd_core_file_failing_signal(bfd *);
*/
int
FUNCTION
core_file_matches_executable_p
+SYNOPSIS
+ boolean core_file_matches_executable_p
+ (bfd *core_bfd, bfd *exec_bfd);
+
DESCRIPTION
Returns <<true>> if the core file attached to @var{core_bfd}
was generated by a run of the executable file attached to
@var{exec_bfd}, or else <<false>>.
-
-SYNOPSIS
- boolean core_file_matches_executable_p
- (bfd *core_bfd, bfd *exec_bfd);
*/
-
boolean
core_file_matches_executable_p (core_bfd, exec_bfd)
bfd *core_bfd, *exec_bfd;
SECTION
Constructors
-DESCRIPTION
Classes in C++ have 'constructors' and 'destructors'. These
are functions which are called automatically by the language
whenever data of a class is created or destroyed. Class data
/*
-INTERNAL FUNCTION
+INTERNAL_FUNCTION
bfd_constructor_entry
+SYNOPSIS
+ void bfd_constructor_entry(bfd *abfd,
+ asymbol **symbol_ptr_ptr,
+ CONST char*type);
+
+
DESCRIPTION
This function is called with an a symbol describing the
function to be called, an string which descibes the xtor type,
have one, and grow a relocation table for the entry points as
they accumulate.
-SYNOPSIS
- void bfd_constructor_entry(bfd *abfd,
- asymbol **symbol_ptr_ptr,
- CONST char*type);
-
*/
#define obj_symbol_slew(bfd) 0
#endif
-#if 0
-typedef struct coff_ptr_struct
-{
- unsigned int offset;
- char fix_tag;
- char fix_end;
- union {
- union internal_auxent auxent;
- struct internal_syment syment;
- } u;
-} combined_entry_type;
-
-
-typedef struct
-{
- asymbol symbol;
- combined_entry_type *native;
- struct lineno_cache_entry *lineno;
-} coff_symbol_type;
-#endif
/* `Tdata' information kept for COFF files. */
-/*THE FOLLOWING IS EXTRACTED FROM THE SOURCE*/
+/* And more taken from the source .. */
-/*:coffcode.h*/
-typedef struct coff_ptr_struct
{
+
+ /* Remembers the offset from the first symbol in the file for
+ this symbol. Generated by coff_renumber_symbols. */
unsigned int offset;
+
+ /* Should the tag field of this symbol be renumbered.
+ Created by coff_pointerize_aux. */
char fix_tag;
+
+ /* Should the endidx field of this symbol be renumbered.
+ Created by coff_pointerize_aux. */
char fix_end;
+
+ /* The container for the symbol structure as read and translated
+ from the file. */
+
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
{
+ /* The actual symbol which the rest of BFD works with */
asymbol symbol;
+
+ /* A pointer to the hidden information for this symbol */
combined_entry_type *native;
+
+ /* A pointer to the linenumber information for this symbol */
struct lineno_cache_entry *lineno;
-} coff_symbol_type;
+} coff_symbol_type;
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
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.
the entry points which call them. Too bad we can't have one
macro to define them both!
+
.typedef struct bfd_target
.{
*/
-/* The default is to define a target_vector containing just the
- DEFAULT_TARGET. (This is to save space in the executables.)
- You can override this by giving an explicit target_vector using
- the SELECT_VECTOR macro.
- Or define ALL_TARGETS macro to get all of the available targets. */
-
+/* The default is to define a target_vector containing all the targets.
+ By setting MINIMIZE=1 on the "make" command line, the user can change this
+ to a vector containing just DEFAULT_VECTOR and any required
+ traditional-core-file handler. (This is to save space in the executables.)
+ The config files can also override the default large vector by giving an
+ explicit SELECT_VECS macro. */
#if MINIMIZE && defined(DEFAULT_VECTOR) && !defined(SELECT_VECS)
#ifdef TRAD_CORE
#endif
#endif
+/* All known xvecs. They are listed a second time below, since
+ we can't intermix extern's and initializers. */
extern bfd_target ecoff_little_vec;
extern bfd_target ecoff_big_vec;
extern bfd_target sunos_big_vec;
#ifdef SELECT_VECS
bfd_target *target_vector[] = {
-SELECT_VECS,
-0
-
+ &icoff_little_vec,
+ 0
};
-#else
-
-#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 ELF_LITTLE_VEC elf_little_vec
-#define ELF_BIG_VEC elf_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
-
-/* 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 */
-#if 0
-#define OASYS_VEC oasys_vec
-#endif
-#define IEEE_VEC ieee_vec
-#define M88KBCS_VEC m88kbcs_vec
-#define SREC_VEC srec_vec
-#define M68KCOFF_VEC m68kcoff_vec
-#define I386COFF_VEC i386coff_vec
-#define I386AOUT_VEC i386aout_vec
-#define A29KCOFF_BIG_VEC a29kcoff_big_vec
-#define RS6000COFF_VEC rs6000coff_vec
-#define H8300COFF_VEC h8300coff_vec
-#endif
+#else
bfd_target *target_vector[] = {
-
-#ifdef DEFAULT_VECTOR
- &DEFAULT_VECTOR,
-#endif
-
-#ifdef I386COFF_VEC
- &I386COFF_VEC,
-#endif
-
-#ifdef I386AOUT_VEC
- &I386AOUT_VEC,
-#endif
-
-#ifdef ECOFF_LITTLE_VEC
- &ECOFF_LITTLE_VEC,
-#endif
-
-#ifdef ECOFF_BIG_VEC
- &ECOFF_BIG_VEC,
-#endif
-
-#ifdef IEEE_VEC
- &IEEE_VEC,
-#endif
-
-#ifdef OASYS_VEC
- &OASYS_VEC,
-#endif
-
-#ifdef SUNOS_VEC_BIG_HOST
- &SUNOS_VEC_BIG_HOST,
-#endif
-
-#ifdef HOST_64_BIT
-#ifdef DEMO_64_VEC
- &DEMO_64_VEC,
-#endif
-#endif
-
-#ifdef H300COFF_VEC
- &h8300coff_vec,
-#endif
-#ifdef M88KBCS_VEC
- &M88KBCS_VEC,
-#endif
-
-#ifdef SREC_VEC
- &SREC_VEC,
-#endif
-
-#ifdef ICOFF_LITTLE_VEC
- &ICOFF_LITTLE_VEC,
-#endif
-
-#ifdef ICOFF_BIG_VEC
- &ICOFF_BIG_VEC,
-#endif
-
-#ifdef ELF_LITTLE_VEC
- &ELF_LITTLE_VEC,
-#endif
-
-#ifdef ELF_BIG_VEC
- &ELF_BIG_VEC,
-#endif
-
-#ifdef B_OUT_VEC_LITTLE_HOST
- &B_OUT_VEC_LITTLE_HOST,
-#endif
-
-#ifdef B_OUT_VEC_BIG_HOST
- &B_OUT_VEC_BIG_HOST,
-#endif
-
-#ifdef M68KCOFF_VEC
- &M68KCOFF_VEC,
-#endif
-
-#ifdef A29KCOFF_BIG_VEC
- &A29KCOFF_BIG_VEC,
-#endif
-
-#ifdef TRAD_CORE
- &trad_core_vec,
-#endif
-
-#ifdef RS6000COFF_VEC
- &RS6000COFF_VEC,
-#endif
-
- NULL, /* end of list marker */
+ &icoff_little_vec,
+ NULL, /* end of list marker */
};
#endif
bfd_target *default_vector[] = {
#ifdef DEFAULT_VECTOR
- &DEFAULT_VECTOR,
+ &DEFAULT_VECTOR,
#endif
- 0,
+ 0,
};
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