gas/config/tc-avr.h

   1 /* This file is tc-avr.h
   2    Copyright 1999, 2000, 2001, 2002, 2005, 2006 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 /* By convention, you should define this macro in the `.h' file.  For
  24    example, `tc-m68k.h' defines `TC_M68K'.  You might have to use this
  25    if it is necessary to add CPU specific code to the object format
  26    file.  */
  27 #define TC_AVR
  28
  29 /* This macro is the BFD target name to use when creating the output
  30    file.  This will normally depend upon the `OBJ_FMT' macro.  */
  31 #define TARGET_FORMAT "elf32-avr"
  32
  33 /* This macro is the BFD architecture to pass to `bfd_set_arch_mach'.  */
  34 #define TARGET_ARCH bfd_arch_avr
  35
  36 /* This macro is the BFD machine number to pass to
  37    `bfd_set_arch_mach'.  If it is not defined, GAS will use 0.  */
  38 #define TARGET_MACH 0
  39
  40 /* You should define this macro to be non-zero if the target is big
  41    endian, and zero if the target is little endian.  */
  42 #define TARGET_BYTES_BIG_ENDIAN 0
  43
  44 /* If you define this macro, GAS will warn about the use of
  45    nonstandard escape sequences in a string.  */
  46 #define ONLY_STANDARD_ESCAPES
  47
  48 /* GAS will call this function for any expression that can not be
  49    recognized.  When the function is called, `input_line_pointer'
  50    will point to the start of the expression.  */
  51 #define md_operand(x)
  52
  53 /* You may define this macro to parse an expression used in a data
  54    allocation pseudo-op such as `.word'.  You can use this to
  55    recognize relocation directives that may appear in such directives.  */
  56 #define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR, N)
  57 extern void avr_parse_cons_expression (expressionS *, int);
  58
  59 /* You may define this macro to generate a fixup for a data
  60    allocation pseudo-op.  */
  61 #define TC_CONS_FIX_NEW(FRAG,WHERE,N,EXP) avr_cons_fix_new (FRAG, WHERE, N, EXP)
  62 extern void avr_cons_fix_new (fragS *,int, int, expressionS *);
  63
  64 /* This should just call either `number_to_chars_bigendian' or
  65    `number_to_chars_littleendian', whichever is appropriate.  On
  66    targets like the MIPS which support options to change the
  67    endianness, which function to call is a runtime decision.  On
  68    other targets, `md_number_to_chars' can be a simple macro.  */
  69 #define md_number_to_chars number_to_chars_littleendian
  70
  71 /* `md_short_jump_size'
  72    `md_long_jump_size'
  73    `md_create_short_jump'
  74    `md_create_long_jump'
  75    If `WORKING_DOT_WORD' is defined, GAS will not do broken word
  76    processing (*note Broken words::.).  Otherwise, you should set
  77    `md_short_jump_size' to the size of a short jump (a jump that is
  78    just long enough to jump around a long jmp) and
  79    `md_long_jump_size' to the size of a long jump (a jump that can go
  80    anywhere in the function), You should define
  81    `md_create_short_jump' to create a short jump around a long jump,
  82    and define `md_create_long_jump' to create a long jump.  */
  83 #define WORKING_DOT_WORD
  84
  85 /* If you define this macro, it means that `tc_gen_reloc' may return
  86    multiple relocation entries for a single fixup.  In this case, the
  87    return value of `tc_gen_reloc' is a pointer to a null terminated
  88    array.  */
  89 #undef RELOC_EXPANSION_POSSIBLE
  90
  91 /* No shared lib support, so we don't need to ensure externally
  92    visible symbols can be overridden.  */
  93 #define EXTERN_FORCE_RELOC 0
  94
  95 /* Values passed to md_apply_fix don't include the symbol value.  */
  96 #define MD_APPLY_SYM_VALUE(FIX) 0
  97
  98 /* If you define this macro, it should return the offset between the
  99    address of a PC relative fixup and the position from which the PC
 100    relative adjustment should be made.  On many processors, the base
 101    of a PC relative instruction is the next instruction, so this
 102    macro would return the length of an instruction.  */
 103 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
 104 extern long md_pcrel_from_section (struct fix *, segT);
 105
 106 /* The number of bytes to put into a word in a listing.  This affects
 107    the way the bytes are clumped together in the listing.  For
 108    example, a value of 2 might print `1234 5678' where a value of 1
 109    would print `12 34 56 78'.  The default value is 4.  */
 110 #define LISTING_WORD_SIZE 2
 111
 112 /* AVR port uses `$' as a logical line separator.  */
 113 #define LEX_DOLLAR 0
 114
 115 /* An `.lcomm' directive with no explicit alignment parameter will
 116    use this macro to set P2VAR to the alignment that a request for
 117    SIZE bytes will have.  The alignment is expressed as a power of
 118    two.  If no alignment should take place, the macro definition
 119    should do nothing.  Some targets define a `.bss' directive that is
 120    also affected by this macro.  The default definition will set
 121    P2VAR to the truncated power of two of sizes up to eight bytes.  */
 122 #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0
 123
 124 /* We don't want gas to fixup the following program memory related relocations.
 125    We will need them in case that we want to do linker relaxation.
 126    We could in principle keep these fixups in gas when not relaxing.
 127    However, there is no serious performance penilty when making the linker
 128    make the fixup work.  */
 129 #define TC_VALIDATE_FIX(FIXP,SEG,SKIP)                      \
 130   if ( FIXP->fx_r_type == BFD_RELOC_AVR_7_PCREL             \
 131     || FIXP->fx_r_type == BFD_RELOC_AVR_13_PCREL            \
 132     || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM          \
 133     || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM          \
 134     || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM          \
 135     || FIXP->fx_r_type == BFD_RELOC_AVR_16_PM)              \
 136     {                                                       \
 137       goto SKIP;                                            \
 138     }
 139