1 /* This file is tc-avr.h 2 Copyright 1999, 2000, 2001, 2002, 2005 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 && (FIXP->fx_addsy)) \ 137 { \ 138 goto SKIP; \ 139 } 140 141