\input texinfo
@c Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
-@c 2001, 2002, 2003, 2004, 2005, 2006
+@c 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
@c Free Software Foundation, Inc.
@setfilename internals.info
@node Top
is called, @code{input_line_pointer} will point to the start of the
expression.
+@item md_register_arithmetic
+@cindex md_register_arithmetic
+If this macro is defined and evaluates to zero then GAS will not fold
+expressions that add or subtract a constant to/from a register to give
+another register. For example GAS's default behaviour is to fold the
+expression "r8 + 1" into "r9", which is probably not the result
+intended by the programmer. The default is to allow such folding,
+since this maintains backwards compatibility with earlier releases of
+GAS.
+
@item tc_unrecognized_line
@cindex tc_unrecognized_line
If you define this macro, GAS will call it when it finds a line that it can not
@cindex md_atof
This function is called to convert an ASCII string into a floating point value
in format used by the CPU. It takes three arguments. The first is @var{type}
-which is a byte describing the type of floating point number to be created.
-Possible values are @var{'f'} or @var{'s'} for single precision, @var{'d'} or
-@var{'r'} for double precision and @var{'x'} or @var{'p'} for extended
-precision. Either lower or upper case versions of these letters can be used.
+which is a byte describing the type of floating point number to be created. It
+is one of the characters defined in the @code{FLT_CHARS} macro. Possible
+values are @var{'f'} or @var{'s'} for single precision, @var{'d'} or @var{'r'}
+for double precision and @var{'x'} or @var{'p'} for extended precision. Either
+lower or upper case versions of these letters can be used. Note: some targets
+do not support all of these types, and some targets may also support other
+types not mentioned here.
The second parameter is @var{litP} which is a pointer to a byte array where the
-converted value should be stored. The third argument is @var{sizeP}, which is
-a pointer to a integer that should be filled in with the number of
-@var{LITTLENUM}s emitted into the byte array. (@var{LITTLENUM} is defined in
-gas/bignum.h). The function should return NULL upon success or an error string
-upon failure.
+converted value should be stored. The value is converted into LITTLENUMs and
+is stored in the target's endian-ness order. (@var{LITTLENUM} is defined in
+gas/bignum.h). Single precision values occupy 2 littlenums. Double precision
+values occupy 4 littlenums and extended precision values occupy either 5 or 6
+littlenums, depending upon the target.
+
+The third argument is @var{sizeP}, which is a pointer to a integer that should
+be filled in with the number of chars emitted into the byte array.
+
+The function should return NULL upon success or an error string upon failure.
@item TC_LARGEST_EXPONENT_IS_NORMAL
@cindex TC_LARGEST_EXPONENT_IS_NORMAL (@var{precision})
@w{@code{! SEG_NORMAL (@var{seg}) || TC_FORCE_RELOCATION (@var{fix})}} will
be used.
-@item TC_FORCE_RELOCATION_SUB_ABS (@var{fix})
+@item TC_FORCE_RELOCATION_SUB_ABS (@var{fix}, @var{seg})
@cindex TC_FORCE_RELOCATION_SUB_ABS
Like @code{TC_FORCE_RELOCATION_SUB_SAME}, but used when the subtrahend is an
absolute symbol. If the macro is undefined a default of @code{0} is used.
-@item TC_FORCE_RELOCATION_SUB_LOCAL (@var{fix})
+@item TC_FORCE_RELOCATION_SUB_LOCAL (@var{fix}, @var{seg})
@cindex TC_FORCE_RELOCATION_SUB_LOCAL
Like @code{TC_FORCE_RELOCATION_SUB_ABS}, but the subtrahend is a symbol in the
same section as the fixup.
-@item TC_VALIDATE_FIX_SUB (@var{fix})
+@item TC_VALIDATE_FIX_SUB (@var{fix}, @var{seg})
@cindex TC_VALIDATE_FIX_SUB
This macro is evaluated for any fixup with a @code{fx_subsy} that
@code{fixup_segment} cannot reduce to a number. If the macro returns
@code{false} an error will be reported.
+@item TC_GLOBAL_REGISTER_SYMBOL_OK
+@cindex TC_GLOBAL_REGISTER_SYMBOL_OK
+Define this macro if global register symbols are supported. The default
+is to disallow global register symbols.
+
@item MD_APPLY_SYM_VALUE (@var{fix})
@cindex MD_APPLY_SYM_VALUE
This macro controls whether the symbol value becomes part of the value passed
a new section's attributes when a directive has no valid flags or when the
flag is @code{w}. The default value of the macro is @code{SEC_LOAD | SEC_DATA}.
-@item DWARF2_FORMAT ()
+@item DWARF2_FORMAT (@var{sec})
@cindex DWARF2_FORMAT
If you define this, it should return one of @code{dwarf2_format_32bit},
@code{dwarf2_format_64bit}, or @code{dwarf2_format_64bit_irix} to indicate
If you don't define this, @code{dwarf2_format_32bit} will be used as
the default.
-This define only affects @code{.debug_info} and @code{.debug_line}
+This define only affects debug
sections generated by the assembler. DWARF 2 sections generated by
other tools will be unaffected by this setting.
backend. This format will be used when generating assembler specific debug
information.
+@item md_allow_local_subtract (@var{left}, @var{right}, @var{section})
+If defined, GAS will call this macro when evaluating an expression which is the
+difference of two symbols defined in the same section. It takes three
+arguments: @code{expressioS * @var{left}} which is the symbolic expression on
+the left hand side of the subtraction operation, @code{expressionS *
+@var{right}} which is the symbolic expression on the right hand side of the
+subtraction, and @code{segT @var{section}} which is the section containing the two
+symbols. The macro should return a non-zero value if the expression should be
+evaluated. Targets which implement link time relaxation which may change the
+position of the two symbols relative to each other should ensure that this
+macro returns zero in situations where this can occur.
+
+@item md_allow_eh_opt
+If defined, GAS will check this macro before performing any optimizations on
+the DWARF call frame debug information that is emitted. Targets which
+implement link time relaxation may need to define this macro and set it to zero
+if it is possible to change the size of a function's prologue.
@end table
@node Object format backend
Destroy a hash table.
@end deftypefun
-@deftypefun @{@} PTR hash_delete (struct hash_control *, const char *)
-Deletes entry from the hash table, returns the value it had.
+@deftypefun @{@} void *hash_delete (struct hash_control *, const char *, int)
+Deletes entry from the hash table, returns the value it had. If the last
+arg is non-zero, free memory allocated for this entry and all entries
+allocated more recently than this entry.
@end deftypefun
-@deftypefun @{@} PTR hash_replace (struct hash_control *, const char *, PTR)
+@deftypefun @{@} void *hash_replace (struct hash_control *, const char *, void *)
Updates the value for an entry already in the table, returning the old value.
If no entry was found, just returns NULL.
@end deftypefun
-@deftypefun @{@} @{const char *@} hash_insert (struct hash_control *, const char *, PTR)
+@deftypefun @{@} @{const char *@} hash_insert (struct hash_control *, const char *, void *)
Inserting a value already in the table is an error.
Returns an error message or NULL.
@end deftypefun
-@deftypefun @{@} @{const char *@} hash_jam (struct hash_control *, const char *, PTR)
+@deftypefun @{@} @{const char *@} hash_jam (struct hash_control *, const char *, void *)
Inserts if the value isn't already present, updates it if it is.
@end deftypefun
projects / msp430-binutils.git / blobdiff