| 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 |