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