1 /* This file is tc-avr.h 2 Copyright (C) 1999-2014 Free Software Foundation, Inc. 3 4 Contributed by Denis Chertykov <denisc (at) 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 3, 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 typedef struct 54 { 55 /* Name of the expression modifier allowed with .byte, .word, etc. */ 56 const char *name; 57 58 /* Only allowed with n bytes of data. */ 59 int nbytes; 60 61 /* Associated RELOC. */ 62 bfd_reloc_code_real_type reloc; 63 64 /* Part of the error message. */ 65 const char *error; 66 } exp_mod_data_t; 67 68 extern const exp_mod_data_t exp_mod_data[]; 69 #define TC_PARSE_CONS_RETURN_TYPE const exp_mod_data_t * 70 #define TC_PARSE_CONS_RETURN_NONE exp_mod_data 71 72 /* You may define this macro to parse an expression used in a data 73 allocation pseudo-op such as `.word'. You can use this to 74 recognize relocation directives that may appear in such directives. */ 75 #define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR, N) 76 extern const exp_mod_data_t *avr_parse_cons_expression (expressionS *, int); 77 78 /* You may define this macro to generate a fixup for a data 79 allocation pseudo-op. */ 80 #define TC_CONS_FIX_NEW avr_cons_fix_new 81 extern void avr_cons_fix_new (fragS *,int, int, expressionS *, 82 const exp_mod_data_t *); 83 84 /* This should just call either `number_to_chars_bigendian' or 85 `number_to_chars_littleendian', whichever is appropriate. On 86 targets like the MIPS which support options to change the 87 endianness, which function to call is a runtime decision. On 88 other targets, `md_number_to_chars' can be a simple macro. */ 89 #define md_number_to_chars number_to_chars_littleendian 90 91 /* `md_short_jump_size' 92 `md_long_jump_size' 93 `md_create_short_jump' 94 `md_create_long_jump' 95 If `WORKING_DOT_WORD' is defined, GAS will not do broken word 96 processing (*note Broken words::.). Otherwise, you should set 97 `md_short_jump_size' to the size of a short jump (a jump that is 98 just long enough to jump around a long jmp) and 99 `md_long_jump_size' to the size of a long jump (a jump that can go 100 anywhere in the function), You should define 101 `md_create_short_jump' to create a short jump around a long jump, 102 and define `md_create_long_jump' to create a long jump. */ 103 #define WORKING_DOT_WORD 104 105 /* If you define this macro, it means that `tc_gen_reloc' may return 106 multiple relocation entries for a single fixup. In this case, the 107 return value of `tc_gen_reloc' is a pointer to a null terminated 108 array. */ 109 #undef RELOC_EXPANSION_POSSIBLE 110 111 /* No shared lib support, so we don't need to ensure externally 112 visible symbols can be overridden. */ 113 #define EXTERN_FORCE_RELOC 0 114 115 /* If defined, this macro allows control over whether fixups for a 116 given section will be processed when the linkrelax variable is 117 set. Define it to zero and handle things in md_apply_fix instead.*/ 118 #define TC_LINKRELAX_FIXUP(SEG) 0 119 120 /* If this macro returns non-zero, it guarantees that a relocation will be emitted 121 even when the value can be resolved locally. Do that if linkrelax is turned on */ 122 #define TC_FORCE_RELOCATION(fix) avr_force_relocation (fix) 123 #define TC_FORCE_RELOCATION_SUB_SAME(fix, seg) \ 124 (! SEG_NORMAL (seg) || avr_force_relocation (fix)) 125 extern int avr_force_relocation (struct fix *); 126 127 /* Values passed to md_apply_fix don't include the symbol value. */ 128 #define MD_APPLY_SYM_VALUE(FIX) 0 129 130 /* If you define this macro, it should return the offset between the 131 address of a PC relative fixup and the position from which the PC 132 relative adjustment should be made. On many processors, the base 133 of a PC relative instruction is the next instruction, so this 134 macro would return the length of an instruction. */ 135 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC) 136 extern long md_pcrel_from_section (struct fix *, segT); 137 138 /* The number of bytes to put into a word in a listing. This affects 139 the way the bytes are clumped together in the listing. For 140 example, a value of 2 might print `1234 5678' where a value of 1 141 would print `12 34 56 78'. The default value is 4. */ 142 #define LISTING_WORD_SIZE 2 143 144 /* AVR port uses `$' as a logical line separator. */ 145 #define LEX_DOLLAR 0 146 147 /* An `.lcomm' directive with no explicit alignment parameter will 148 use this macro to set P2VAR to the alignment that a request for 149 SIZE bytes will have. The alignment is expressed as a power of 150 two. If no alignment should take place, the macro definition 151 should do nothing. Some targets define a `.bss' directive that is 152 also affected by this macro. The default definition will set 153 P2VAR to the truncated power of two of sizes up to eight bytes. */ 154 #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0 155 156 /* We don't want gas to fixup the following program memory related relocations. 157 We will need them in case that we want to do linker relaxation. 158 We could in principle keep these fixups in gas when not relaxing. 159 However, there is no serious performance penalty when making the linker 160 make the fixup work. Check also that fx_addsy is not NULL, in order to make 161 sure that the fixup refers to some sort of label. */ 162 #define TC_VALIDATE_FIX(FIXP,SEG,SKIP) \ 163 if ( (FIXP->fx_r_type == BFD_RELOC_AVR_7_PCREL \ 164 || FIXP->fx_r_type == BFD_RELOC_AVR_13_PCREL \ 165 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM \ 166 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_GS \ 167 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM \ 168 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_GS \ 169 || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM \ 170 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM_NEG \ 171 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM_NEG \ 172 || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM_NEG \ 173 || FIXP->fx_r_type == BFD_RELOC_AVR_8_LO \ 174 || FIXP->fx_r_type == BFD_RELOC_AVR_8_HI \ 175 || FIXP->fx_r_type == BFD_RELOC_AVR_8_HLO \ 176 || FIXP->fx_r_type == BFD_RELOC_AVR_16_PM) \ 177 && FIXP->fx_addsy != NULL \ 178 && FIXP->fx_subsy == NULL) \ 179 { \ 180 symbol_mark_used_in_reloc (FIXP->fx_addsy); \ 181 goto SKIP; \ 182 } 183 184 /* This macro is evaluated for any fixup with a fx_subsy that 185 fixup_segment cannot reduce to a number. If the macro returns 186 false an error will be reported. */ 187 #define TC_VALIDATE_FIX_SUB(fix, seg) avr_validate_fix_sub (fix) 188 extern int avr_validate_fix_sub (struct fix *); 189 190 /* This target is buggy, and sets fix size too large. */ 191 #define TC_FX_SIZE_SLACK(FIX) 2 192 193 /* AVR instructions are 2 or 4 bytes long. */ 194 #define DWARF2_LINE_MIN_INSN_LENGTH 2 195 196 /* 32 bits pseudo-addresses are used on AVR. */ 197 #define DWARF2_ADDR_SIZE(bfd) 4 198 199 /* Enable cfi directives. */ 200 #define TARGET_USE_CFIPOP 1 201 202 /* The stack grows down, and is only byte aligned. */ 203 #define DWARF2_CIE_DATA_ALIGNMENT -1 204 205 /* Define the column that represents the PC. */ 206 #define DWARF2_DEFAULT_RETURN_COLUMN 36 207 208 /* Define a hook to setup initial CFI state. */ 209 extern void tc_cfi_frame_initial_instructions (void); 210 #define tc_cfi_frame_initial_instructions tc_cfi_frame_initial_instructions 211 212 /* The difference between same-section symbols may be affected by linker 213 relaxation, so do not resolve such expressions in the assembler. */ 214 #define md_allow_local_subtract(l,r,s) avr_allow_local_subtract (l, r, s) 215 extern bfd_boolean avr_allow_local_subtract (expressionS *, expressionS *, segT); 216
