gas/config/tc-avr.h

   1 /* This file is tc-avr.h
   2    Copyright 1999, 2000, 2001, 2002, 2005, 2006, 2007
   3    Free Software Foundation, Inc.
   4
   5    Contributed by Denis Chertykov <denisc@overta.ru>
   6
   7    This file is part of GAS, the GNU Assembler.
   8
   9    GAS is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3, or (at your option)
  12    any later version.
  13
  14    GAS is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GAS; see the file COPYING.  If not, write to the Free
  21    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  22    02110-1301, USA.  */
  23
  24 /* By convention, you should define this macro in the `.h' file.  For
  25    example, `tc-m68k.h' defines `TC_M68K'.  You might have to use this
  26    if it is necessary to add CPU specific code to the object format
  27    file.  */
  28 #define TC_AVR
  29
  30 /* This macro is the BFD target name to use when creating the output
  31    file.  This will normally depend upon the `OBJ_FMT' macro.  */
  32 #define TARGET_FORMAT "elf32-avr"
  33
  34 /* This macro is the BFD architecture to pass to `bfd_set_arch_mach'.  */
  35 #define TARGET_ARCH bfd_arch_avr
  36
  37 /* This macro is the BFD machine number to pass to
  38    `bfd_set_arch_mach'.  If it is not defined, GAS will use 0.  */
  39 #define TARGET_MACH 0
  40
  41 /* You should define this macro to be non-zero if the target is big
  42    endian, and zero if the target is little endian.  */
  43 #define TARGET_BYTES_BIG_ENDIAN 0
  44
  45 /* If you define this macro, GAS will warn about the use of
  46    nonstandard escape sequences in a string.  */
  47 #define ONLY_STANDARD_ESCAPES
  48
  49 /* GAS will call this function for any expression that can not be
  50    recognized.  When the function is called, `input_line_pointer'
  51    will point to the start of the expression.  */
  52 #define md_operand(x)
  53
  54 /* You may define this macro to parse an expression used in a data
  55    allocation pseudo-op such as `.word'.  You can use this to
  56    recognize relocation directives that may appear in such directives.  */
  57 #define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR, N)
  58 extern void avr_parse_cons_expression (expressionS *, int);
  59
  60 /* You may define this macro to generate a fixup for a data
  61    allocation pseudo-op.  */
  62 #define TC_CONS_FIX_NEW(FRAG,WHERE,N,EXP) avr_cons_fix_new (FRAG, WHERE, N, EXP)
  63 extern void avr_cons_fix_new (fragS *,int, int, expressionS *);
  64
  65 /* This should just call either `number_to_chars_bigendian' or
  66    `number_to_chars_littleendian', whichever is appropriate.  On
  67    targets like the MIPS which support options to change the
  68    endianness, which function to call is a runtime decision.  On
  69    other targets, `md_number_to_chars' can be a simple macro.  */
  70 #define md_number_to_chars number_to_chars_littleendian
  71
  72 /* `md_short_jump_size'
  73    `md_long_jump_size'
  74    `md_create_short_jump'
  75    `md_create_long_jump'
  76    If `WORKING_DOT_WORD' is defined, GAS will not do broken word
  77    processing (*note Broken words::.).  Otherwise, you should set
  78    `md_short_jump_size' to the size of a short jump (a jump that is
  79    just long enough to jump around a long jmp) and
  80    `md_long_jump_size' to the size of a long jump (a jump that can go
  81    anywhere in the function), You should define
  82    `md_create_short_jump' to create a short jump around a long jump,
  83    and define `md_create_long_jump' to create a long jump.  */
  84 #define WORKING_DOT_WORD
  85
  86 /* If you define this macro, it means that `tc_gen_reloc' may return
  87    multiple relocation entries for a single fixup.  In this case, the
  88    return value of `tc_gen_reloc' is a pointer to a null terminated
  89    array.  */
  90 #undef RELOC_EXPANSION_POSSIBLE
  91
  92 /* No shared lib support, so we don't need to ensure externally
  93    visible symbols can be overridden.  */
  94 #define EXTERN_FORCE_RELOC 0
  95
  96 /* Values passed to md_apply_fix don't include the symbol value.  */
  97 #define MD_APPLY_SYM_VALUE(FIX) 0
  98
  99 /* If you define this macro, it should return the offset between the
 100    address of a PC relative fixup and the position from which the PC
 101    relative adjustment should be made.  On many processors, the base
 102    of a PC relative instruction is the next instruction, so this
 103    macro would return the length of an instruction.  */
 104 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
 105 extern long md_pcrel_from_section (struct fix *, segT);
 106
 107 /* The number of bytes to put into a word in a listing.  This affects
 108    the way the bytes are clumped together in the listing.  For
 109    example, a value of 2 might print `1234 5678' where a value of 1
 110    would print `12 34 56 78'.  The default value is 4.  */
 111 #define LISTING_WORD_SIZE 2
 112
 113 /* AVR port uses `$' as a logical line separator.  */
 114 #define LEX_DOLLAR 0
 115
 116 /* An `.lcomm' directive with no explicit alignment parameter will
 117    use this macro to set P2VAR to the alignment that a request for
 118    SIZE bytes will have.  The alignment is expressed as a power of
 119    two.  If no alignment should take place, the macro definition
 120    should do nothing.  Some targets define a `.bss' directive that is
 121    also affected by this macro.  The default definition will set
 122    P2VAR to the truncated power of two of sizes up to eight bytes.  */
 123 #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0
 124
 125 /* We don't want gas to fixup the following program memory related relocations.
 126    We will need them in case that we want to do linker relaxation.
 127    We could in principle keep these fixups in gas when not relaxing.
 128    However, there is no serious performance penilty when making the linker
 129    make the fixup work.  Check also that fx_addsy is not NULL, in order to make
 130    sure that the fixup refers to some sort of lable.  */
 131 #define TC_VALIDATE_FIX(FIXP,SEG,SKIP)                       \
 132   if (   (FIXP->fx_r_type == BFD_RELOC_AVR_7_PCREL           \
 133        || FIXP->fx_r_type == BFD_RELOC_AVR_13_PCREL          \
 134        || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM        \
 135        || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_GS        \
 136        || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM        \
 137        || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_GS        \
 138        || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM        \
 139        || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM_NEG    \
 140        || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM_NEG    \
 141        || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM_NEG    \
 142        || FIXP->fx_r_type == BFD_RELOC_AVR_16_PM)            \
 143       && (FIXP->fx_addsy))                                   \
 144     {                                                        \
 145       goto SKIP;                                             \
 146    }
 147
 148 /* This target is buggy, and sets fix size too large.  */
 149 #define TC_FX_SIZE_SLACK(FIX) 2
 150
 151 /* AVR instructions are 2 or 4 bytes long.  */
 152 #define DWARF2_LINE_MIN_INSN_LENGTH     2
 153
 154 /* 32 bits pseudo-addresses are used on AVR.  */
 155 #define DWARF2_ADDR_SIZE(bfd) 4