| 1 | /* This file is tc-avr.h |
| 2 | Copyright (C) 1999-2016 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 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 | #define DIFF_EXPR_OK /* .-foo gets turned into PC relative relocs */ |
| 49 | |
| 50 | /* GAS will call this function for any expression that can not be |
| 51 | recognized. When the function is called, `input_line_pointer' |
| 52 | will point to the start of the expression. */ |
| 53 | #define md_operand(x) |
| 54 | |
| 55 | typedef struct |
| 56 | { |
| 57 | /* Name of the expression modifier allowed with .byte, .word, etc. */ |
| 58 | const char *name; |
| 59 | |
| 60 | /* Only allowed with n bytes of data. */ |
| 61 | int nbytes; |
| 62 | |
| 63 | /* Associated RELOC. */ |
| 64 | bfd_reloc_code_real_type reloc; |
| 65 | |
| 66 | /* Part of the error message. */ |
| 67 | const char *error; |
| 68 | } exp_mod_data_t; |
| 69 | |
| 70 | extern const exp_mod_data_t exp_mod_data[]; |
| 71 | #define TC_PARSE_CONS_RETURN_TYPE const exp_mod_data_t * |
| 72 | #define TC_PARSE_CONS_RETURN_NONE exp_mod_data |
| 73 | |
| 74 | /* You may define this macro to parse an expression used in a data |
| 75 | allocation pseudo-op such as `.word'. You can use this to |
| 76 | recognize relocation directives that may appear in such directives. */ |
| 77 | #define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR, N) |
| 78 | extern const exp_mod_data_t *avr_parse_cons_expression (expressionS *, int); |
| 79 | |
| 80 | /* You may define this macro to generate a fixup for a data |
| 81 | allocation pseudo-op. */ |
| 82 | #define TC_CONS_FIX_NEW avr_cons_fix_new |
| 83 | extern void avr_cons_fix_new (fragS *,int, int, expressionS *, |
| 84 | const exp_mod_data_t *); |
| 85 | |
| 86 | /* This should just call either `number_to_chars_bigendian' or |
| 87 | `number_to_chars_littleendian', whichever is appropriate. On |
| 88 | targets like the MIPS which support options to change the |
| 89 | endianness, which function to call is a runtime decision. On |
| 90 | other targets, `md_number_to_chars' can be a simple macro. */ |
| 91 | #define md_number_to_chars number_to_chars_littleendian |
| 92 | |
| 93 | /* `md_short_jump_size' |
| 94 | `md_long_jump_size' |
| 95 | `md_create_short_jump' |
| 96 | `md_create_long_jump' |
| 97 | If `WORKING_DOT_WORD' is defined, GAS will not do broken word |
| 98 | processing (*note Broken words::.). Otherwise, you should set |
| 99 | `md_short_jump_size' to the size of a short jump (a jump that is |
| 100 | just long enough to jump around a long jmp) and |
| 101 | `md_long_jump_size' to the size of a long jump (a jump that can go |
| 102 | anywhere in the function), You should define |
| 103 | `md_create_short_jump' to create a short jump around a long jump, |
| 104 | and define `md_create_long_jump' to create a long jump. */ |
| 105 | #define WORKING_DOT_WORD |
| 106 | |
| 107 | /* If you define this macro, it means that `tc_gen_reloc' may return |
| 108 | multiple relocation entries for a single fixup. In this case, the |
| 109 | return value of `tc_gen_reloc' is a pointer to a null terminated |
| 110 | array. */ |
| 111 | #undef RELOC_EXPANSION_POSSIBLE |
| 112 | |
| 113 | /* No shared lib support, so we don't need to ensure externally |
| 114 | visible symbols can be overridden. */ |
| 115 | #define EXTERN_FORCE_RELOC 0 |
| 116 | |
| 117 | /* If defined, this macro allows control over whether fixups for a |
| 118 | given section will be processed when the linkrelax variable is |
| 119 | set. Define it to zero and handle things in md_apply_fix instead.*/ |
| 120 | #define TC_LINKRELAX_FIXUP(SEG) 0 |
| 121 | |
| 122 | /* If this macro returns non-zero, it guarantees that a relocation will be emitted |
| 123 | even when the value can be resolved locally. Do that if linkrelax is turned on */ |
| 124 | #define TC_FORCE_RELOCATION(fix) avr_force_relocation (fix) |
| 125 | #define TC_FORCE_RELOCATION_SUB_SAME(fix, seg) \ |
| 126 | (! SEG_NORMAL (seg) || avr_force_relocation (fix)) |
| 127 | extern int avr_force_relocation (struct fix *); |
| 128 | |
| 129 | /* Values passed to md_apply_fix don't include the symbol value. */ |
| 130 | #define MD_APPLY_SYM_VALUE(FIX) 0 |
| 131 | |
| 132 | /* If you define this macro, it should return the offset between the |
| 133 | address of a PC relative fixup and the position from which the PC |
| 134 | relative adjustment should be made. On many processors, the base |
| 135 | of a PC relative instruction is the next instruction, so this |
| 136 | macro would return the length of an instruction. */ |
| 137 | #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC) |
| 138 | extern long md_pcrel_from_section (struct fix *, segT); |
| 139 | |
| 140 | /* The number of bytes to put into a word in a listing. This affects |
| 141 | the way the bytes are clumped together in the listing. For |
| 142 | example, a value of 2 might print `1234 5678' where a value of 1 |
| 143 | would print `12 34 56 78'. The default value is 4. */ |
| 144 | #define LISTING_WORD_SIZE 2 |
| 145 | |
| 146 | /* AVR port uses `$' as a logical line separator. */ |
| 147 | #define LEX_DOLLAR 0 |
| 148 | |
| 149 | /* An `.lcomm' directive with no explicit alignment parameter will |
| 150 | use this macro to set P2VAR to the alignment that a request for |
| 151 | SIZE bytes will have. The alignment is expressed as a power of |
| 152 | two. If no alignment should take place, the macro definition |
| 153 | should do nothing. Some targets define a `.bss' directive that is |
| 154 | also affected by this macro. The default definition will set |
| 155 | P2VAR to the truncated power of two of sizes up to eight bytes. */ |
| 156 | #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0 |
| 157 | |
| 158 | /* We don't want gas to fixup the following program memory related relocations. |
| 159 | We will need them in case that we want to do linker relaxation. |
| 160 | We could in principle keep these fixups in gas when not relaxing. |
| 161 | However, there is no serious performance penalty when making the linker |
| 162 | make the fixup work. Check also that fx_addsy is not NULL, in order to make |
| 163 | sure that the fixup refers to some sort of label. */ |
| 164 | #define TC_VALIDATE_FIX(FIXP,SEG,SKIP) \ |
| 165 | if ( (FIXP->fx_r_type == BFD_RELOC_AVR_7_PCREL \ |
| 166 | || FIXP->fx_r_type == BFD_RELOC_AVR_13_PCREL \ |
| 167 | || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM \ |
| 168 | || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_GS \ |
| 169 | || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM \ |
| 170 | || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_GS \ |
| 171 | || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM \ |
| 172 | || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM_NEG \ |
| 173 | || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM_NEG \ |
| 174 | || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM_NEG \ |
| 175 | || FIXP->fx_r_type == BFD_RELOC_AVR_8_LO \ |
| 176 | || FIXP->fx_r_type == BFD_RELOC_AVR_8_HI \ |
| 177 | || FIXP->fx_r_type == BFD_RELOC_AVR_8_HLO \ |
| 178 | || FIXP->fx_r_type == BFD_RELOC_AVR_16_PM) \ |
| 179 | && FIXP->fx_addsy != NULL \ |
| 180 | && FIXP->fx_subsy == NULL) \ |
| 181 | { \ |
| 182 | symbol_mark_used_in_reloc (FIXP->fx_addsy); \ |
| 183 | goto SKIP; \ |
| 184 | } |
| 185 | |
| 186 | /* This macro is evaluated for any fixup with a fx_subsy that |
| 187 | fixup_segment cannot reduce to a number. If the macro returns |
| 188 | false an error will be reported. */ |
| 189 | #define TC_VALIDATE_FIX_SUB(fix, seg) avr_validate_fix_sub (fix) |
| 190 | extern int avr_validate_fix_sub (struct fix *); |
| 191 | |
| 192 | /* This target is buggy, and sets fix size too large. */ |
| 193 | #define TC_FX_SIZE_SLACK(FIX) 2 |
| 194 | |
| 195 | /* AVR instructions are 2 or 4 bytes long. */ |
| 196 | #define DWARF2_LINE_MIN_INSN_LENGTH 2 |
| 197 | |
| 198 | /* 32 bits pseudo-addresses are used on AVR. */ |
| 199 | #define DWARF2_ADDR_SIZE(bfd) 4 |
| 200 | |
| 201 | /* Enable cfi directives. */ |
| 202 | #define TARGET_USE_CFIPOP 1 |
| 203 | |
| 204 | /* The stack grows down, and is only byte aligned. */ |
| 205 | #define DWARF2_CIE_DATA_ALIGNMENT -1 |
| 206 | |
| 207 | /* Define the column that represents the PC. */ |
| 208 | #define DWARF2_DEFAULT_RETURN_COLUMN 36 |
| 209 | |
| 210 | /* Define a hook to setup initial CFI state. */ |
| 211 | extern void tc_cfi_frame_initial_instructions (void); |
| 212 | #define tc_cfi_frame_initial_instructions tc_cfi_frame_initial_instructions |
| 213 | |
| 214 | /* The difference between same-section symbols may be affected by linker |
| 215 | relaxation, so do not resolve such expressions in the assembler. */ |
| 216 | #define md_allow_local_subtract(l,r,s) avr_allow_local_subtract (l, r, s) |
| 217 | extern bfd_boolean avr_allow_local_subtract (expressionS *, expressionS *, segT); |
| 218 | |
| 219 | #define elf_tc_final_processing avr_elf_final_processing |
| 220 | extern void avr_elf_final_processing (void); |
| 221 | |
| 222 | #define md_post_relax_hook avr_post_relax_hook () |
| 223 | extern void avr_post_relax_hook (void); |
| 224 | |
| 225 | #define HANDLE_ALIGN(fragP) avr_handle_align (fragP) |
| 226 | extern void avr_handle_align (fragS *fragP); |
| 227 | |
| 228 | struct avr_frag_data |
| 229 | { |
| 230 | unsigned is_org : 1; |
| 231 | unsigned is_align : 1; |
| 232 | unsigned has_fill : 1; |
| 233 | |
| 234 | char fill; |
| 235 | offsetT alignment; |
| 236 | }; |
| 237 | #define TC_FRAG_TYPE struct avr_frag_data |