gas/config/tc-avr.h

   1 /* This file is tc-avr.h
   2    Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
   3
   4    Contributed by Denis Chertykov <denisc@overta.ru>
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 #ifndef BFD_ASSEMBLER
  24  #error AVR support requires BFD_ASSEMBLER
  25 #endif
  26
  27 /* By convention, you should define this macro in the `.h' file.  For
  28    example, `tc-m68k.h' defines `TC_M68K'.  You might have to use this
  29    if it is necessary to add CPU specific code to the object format
  30    file.  */
  31 #define TC_AVR
  32
  33 /* This macro is the BFD target name to use when creating the output
  34    file.  This will normally depend upon the `OBJ_FMT' macro.  */
  35 #define TARGET_FORMAT "elf32-avr"
  36
  37 /* This macro is the BFD architecture to pass to `bfd_set_arch_mach'.  */
  38 #define TARGET_ARCH bfd_arch_avr
  39
  40 /* This macro is the BFD machine number to pass to
  41    `bfd_set_arch_mach'.  If it is not defined, GAS will use 0.  */
  42 #define TARGET_MACH 0
  43
  44 /* You should define this macro to be non-zero if the target is big
  45    endian, and zero if the target is little endian.  */
  46 #define TARGET_BYTES_BIG_ENDIAN 0
  47
  48 /* If you define this macro, GAS will warn about the use of
  49    nonstandard escape sequences in a string.  */
  50 #define ONLY_STANDARD_ESCAPES
  51
  52 /* GAS will call this function for any expression that can not be
  53    recognized.  When the function is called, `input_line_pointer'
  54    will point to the start of the expression.  */
  55 #define md_operand(x)
  56
  57 /* You may define this macro to parse an expression used in a data
  58    allocation pseudo-op such as `.word'.  You can use this to
  59    recognize relocation directives that may appear in such directives.  */
  60 #define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR,N)
  61 void avr_parse_cons_expression (expressionS *exp, int nbytes);
  62
  63 /* You may define this macro to generate a fixup for a data
  64    allocation pseudo-op.  */
  65 #define TC_CONS_FIX_NEW(FRAG,WHERE,N,EXP) avr_cons_fix_new(FRAG,WHERE,N,EXP)
  66 void avr_cons_fix_new(fragS *frag,int where, int nbytes, expressionS *exp);
  67
  68 /* This should just call either `number_to_chars_bigendian' or
  69    `number_to_chars_littleendian', whichever is appropriate.  On
  70    targets like the MIPS which support options to change the
  71    endianness, which function to call is a runtime decision.  On
  72    other targets, `md_number_to_chars' can be a simple macro.  */
  73 #define md_number_to_chars number_to_chars_littleendian
  74
  75 /* `md_short_jump_size'
  76    `md_long_jump_size'
  77    `md_create_short_jump'
  78    `md_create_long_jump'
  79    If `WORKING_DOT_WORD' is defined, GAS will not do broken word
  80    processing (*note Broken words::.).  Otherwise, you should set
  81    `md_short_jump_size' to the size of a short jump (a jump that is
  82    just long enough to jump around a long jmp) and
  83    `md_long_jump_size' to the size of a long jump (a jump that can go
  84    anywhere in the function), You should define
  85    `md_create_short_jump' to create a short jump around a long jump,
  86    and define `md_create_long_jump' to create a long jump.  */
  87 #define WORKING_DOT_WORD
  88
  89 /* If you define this macro, it means that `tc_gen_reloc' may return
  90    multiple relocation entries for a single fixup.  In this case, the
  91    return value of `tc_gen_reloc' is a pointer to a null terminated
  92    array.  */
  93 #undef RELOC_EXPANSION_POSSIBLE
  94
  95 /* No shared lib support, so we don't need to ensure externally
  96    visible symbols can be overridden.  */
  97 #define EXTERN_FORCE_RELOC 0
  98
  99 /* Values passed to md_apply_fix3 don't include the symbol value.  */
 100 #define MD_APPLY_SYM_VALUE(FIX) 0
 101
 102 /* If you define this macro, it should return the offset between the
 103    address of a PC relative fixup and the position from which the PC
 104    relative adjustment should be made.  On many processors, the base
 105    of a PC relative instruction is the next instruction, so this
 106    macro would return the length of an instruction.  */
 107 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC)
 108 extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
 109
 110 /* The number of bytes to put into a word in a listing.  This affects
 111    the way the bytes are clumped together in the listing.  For
 112    example, a value of 2 might print `1234 5678' where a value of 1
 113    would print `12 34 56 78'.  The default value is 4.  */
 114 #define LISTING_WORD_SIZE 2
 115
 116 /* AVR port uses `$' as a logical line separator */
 117 #define LEX_DOLLAR 0
 118
 119 /* An `.lcomm' directive with no explicit alignment parameter will
 120    use this macro to set P2VAR to the alignment that a request for
 121    SIZE bytes will have.  The alignment is expressed as a power of
 122    two.  If no alignment should take place, the macro definition
 123    should do nothing.  Some targets define a `.bss' directive that is
 124    also affected by this macro.  The default definition will set
 125    P2VAR to the truncated power of two of sizes up to eight bytes.  */
 126 #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0