source: trunk/binutils/gas/config/tc-avr.h@ 2446

/* This file is tc-avr.h
   Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

   Contributed by Denis Chertykov <denisc@overta.ru>

   This file is part of GAS, the GNU Assembler.

   GAS 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, or (at your option)
   any later version.

   GAS 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 GAS; see the file COPYING.  If not, write to the Free
   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.  */

#ifndef BFD_ASSEMBLER
 #error AVR support requires BFD_ASSEMBLER
#endif

/* By convention, you should define this macro in the `.h' file.  For
   example, `tc-m68k.h' defines `TC_M68K'.  You might have to use this
   if it is necessary to add CPU specific code to the object format
   file.  */
#define TC_AVR

/* This macro is the BFD target name to use when creating the output
   file.  This will normally depend upon the `OBJ_FMT' macro.  */
#define TARGET_FORMAT "elf32-avr"

/* This macro is the BFD architecture to pass to `bfd_set_arch_mach'.  */
#define TARGET_ARCH bfd_arch_avr

/* This macro is the BFD machine number to pass to
   `bfd_set_arch_mach'.  If it is not defined, GAS will use 0.  */
#define TARGET_MACH 0

/* You should define this macro to be non-zero if the target is big
   endian, and zero if the target is little endian.  */
#define TARGET_BYTES_BIG_ENDIAN 0

/* If you define this macro, GAS will warn about the use of
   nonstandard escape sequences in a string.  */
#define ONLY_STANDARD_ESCAPES

/* GAS will call this function for any expression that can not be
   recognized.  When the function is called, `input_line_pointer'
   will point to the start of the expression.  */
#define md_operand(x)

/* You may define this macro to parse an expression used in a data
   allocation pseudo-op such as `.word'.  You can use this to
   recognize relocation directives that may appear in such directives.  */
#define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR,N)
void avr_parse_cons_expression (expressionS *exp, int nbytes);

/* You may define this macro to generate a fixup for a data
   allocation pseudo-op.  */
#define TC_CONS_FIX_NEW(FRAG,WHERE,N,EXP) avr_cons_fix_new(FRAG,WHERE,N,EXP)
void avr_cons_fix_new(fragS *frag,int where, int nbytes, expressionS *exp);

/* This should just call either `number_to_chars_bigendian' or
   `number_to_chars_littleendian', whichever is appropriate.  On
   targets like the MIPS which support options to change the
   endianness, which function to call is a runtime decision.  On
   other targets, `md_number_to_chars' can be a simple macro.  */
#define md_number_to_chars number_to_chars_littleendian

/* `md_short_jump_size'
   `md_long_jump_size'
   `md_create_short_jump'
   `md_create_long_jump'
   If `WORKING_DOT_WORD' is defined, GAS will not do broken word
   processing (*note Broken words::.).  Otherwise, you should set
   `md_short_jump_size' to the size of a short jump (a jump that is
   just long enough to jump around a long jmp) and
   `md_long_jump_size' to the size of a long jump (a jump that can go
   anywhere in the function), You should define
   `md_create_short_jump' to create a short jump around a long jump,
   and define `md_create_long_jump' to create a long jump.  */
#define WORKING_DOT_WORD

/* If you define this macro, it means that `tc_gen_reloc' may return
   multiple relocation entries for a single fixup.  In this case, the
   return value of `tc_gen_reloc' is a pointer to a null terminated
   array.  */
#undef RELOC_EXPANSION_POSSIBLE

/* No shared lib support, so we don't need to ensure externally
   visible symbols can be overridden.  */
#define EXTERN_FORCE_RELOC 0

/* Values passed to md_apply_fix3 don't include the symbol value.  */
#define MD_APPLY_SYM_VALUE(FIX) 0

/* If you define this macro, it should return the offset between the
   address of a PC relative fixup and the position from which the PC
   relative adjustment should be made.  On many processors, the base
   of a PC relative instruction is the next instruction, so this
   macro would return the length of an instruction.  */
#define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC)
extern long md_pcrel_from_section PARAMS ((struct fix *, segT));

/* The number of bytes to put into a word in a listing.  This affects
   the way the bytes are clumped together in the listing.  For
   example, a value of 2 might print `1234 5678' where a value of 1
   would print `12 34 56 78'.  The default value is 4.  */
#define LISTING_WORD_SIZE 2

/* AVR port uses `$' as a logical line separator */
#define LEX_DOLLAR 0

/* An `.lcomm' directive with no explicit alignment parameter will
   use this macro to set P2VAR to the alignment that a request for
   SIZE bytes will have.  The alignment is expressed as a power of
   two.  If no alignment should take place, the macro definition
   should do nothing.  Some targets define a `.bss' directive that is
   also affected by this macro.  The default definition will set
   P2VAR to the truncated power of two of sizes up to eight bytes.  */
#define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0