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, 59 Temple Place - Suite 330, Boston, MA 21 02111-1307, 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) = 0 127