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252b5132 | 1 | /* This file is tc-arm.h |
219d1afa | 2 | Copyright (C) 1994-2018 Free Software Foundation, Inc. |
252b5132 RH |
3 | Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org) |
4 | Modified by David Taylor (dtaylor@armltd.co.uk) | |
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 | |
ec2655a6 | 10 | the Free Software Foundation; either version 3, or (at your option) |
252b5132 RH |
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 | |
4b4da160 NC |
20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
252b5132 RH |
22 | |
23 | #define TC_ARM 1 | |
24 | ||
25 | #ifndef TARGET_BYTES_BIG_ENDIAN | |
26 | #define TARGET_BYTES_BIG_ENDIAN 0 | |
27 | #endif | |
28 | ||
29 | #define WORKING_DOT_WORD | |
30 | ||
31 | #define COFF_MAGIC ARMMAGIC | |
32 | #define TARGET_ARCH bfd_arch_arm | |
33 | ||
252b5132 RH |
34 | #define DIFF_EXPR_OK |
35 | ||
36 | #ifdef LITTLE_ENDIAN | |
37 | #undef LITTLE_ENDIAN | |
38 | #endif | |
39 | ||
40 | #ifdef BIG_ENDIAN | |
41 | #undef BIG_ENDIAN | |
42 | #endif | |
43 | ||
44 | #define LITTLE_ENDIAN 1234 | |
45 | #define BIG_ENDIAN 4321 | |
46 | ||
a161fe53 AM |
47 | struct fix; |
48 | ||
2ac93be7 | 49 | #if defined OBJ_COFF |
252b5132 | 50 | # define ARM_BI_ENDIAN |
252b5132 | 51 | # if defined TE_PE |
ddb00039 | 52 | # if defined TE_WINCE |
7148cc28 | 53 | # define TARGET_FORMAT (target_big_endian ? "pe-arm-wince-big" : "pe-arm-wince-little") |
69b97547 NC |
54 | # else |
55 | # define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little") | |
56 | # endif | |
252b5132 RH |
57 | # else |
58 | # define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little") | |
59 | # endif | |
69b97547 NC |
60 | #elif defined OBJ_ELF |
61 | # define ARM_BI_ENDIAN | |
62 | # define TARGET_FORMAT elf32_arm_target_format () | |
252b5132 RH |
63 | #endif |
64 | ||
1bf10b0d NC |
65 | /* We support double slash line-comments for compatibility with the ARM AArch64 Assembler. */ |
66 | #define DOUBLESLASH_LINE_COMMENTS | |
67 | ||
2e6976a8 DG |
68 | /* We conditionally support labels without a colon. */ |
69 | #define LABELS_WITHOUT_COLONS codecomposer_syntax | |
70 | extern bfd_boolean codecomposer_syntax; | |
71 | ||
bacebabc RM |
72 | #define tc_symbol_chars arm_symbol_chars |
73 | extern const char arm_symbol_chars[]; | |
74 | ||
114424c6 | 75 | #define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX) |
114424c6 | 76 | |
fa94de6b RM |
77 | extern unsigned int arm_frag_max_var (struct frag *); |
78 | #define md_frag_max_var arm_frag_max_var | |
79 | ||
0110f2b8 | 80 | #define md_relax_frag(segment, fragp, stretch) \ |
e07e6e58 | 81 | arm_relax_frag (segment, fragp, stretch) |
0110f2b8 | 82 | extern int arm_relax_frag (asection *, struct frag *, long); |
252b5132 | 83 | |
a8bc6c78 PB |
84 | #define md_optimize_expr(l,o,r) arm_optimize_expr (l, o, r) |
85 | extern int arm_optimize_expr (expressionS *, operatorT, expressionS *); | |
86 | ||
252b5132 | 87 | #define md_cleanup() arm_cleanup () |
252b5132 RH |
88 | |
89 | #define md_start_line_hook() arm_start_line_hook () | |
252b5132 | 90 | |
2e57ce7b AM |
91 | #define TC_START_LABEL_WITHOUT_COLON(NUL_CHAR, NEXT_CHAR) \ |
92 | tc_start_label_without_colon () | |
93 | extern bfd_boolean tc_start_label_without_colon (void); | |
2e6976a8 | 94 | |
252b5132 | 95 | #define tc_frob_label(S) arm_frob_label (S) |
252b5132 RH |
96 | |
97 | /* We also need to mark assembler created symbols: */ | |
98 | #define tc_frob_fake_label(S) arm_frob_label (S) | |
99 | ||
ee065d83 PB |
100 | #ifdef OBJ_ELF |
101 | #define md_end arm_md_end | |
102 | extern void arm_md_end (void); | |
e1da3f5b | 103 | bfd_boolean arm_is_eabi (void); |
3cfdb781 | 104 | |
c168ce07 TP |
105 | #define md_post_relax_hook arm_md_post_relax () |
106 | extern void arm_md_post_relax (void); | |
ee065d83 PB |
107 | #endif |
108 | ||
252b5132 RH |
109 | /* NOTE: The fake label creation in stabs.c:s_stab_generic() has |
110 | deliberately not been updated to mark assembler created stabs | |
111 | symbols as Thumb. */ | |
112 | ||
adbaf948 ZW |
113 | #define TC_FIX_TYPE int |
114 | #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0) | |
29c4c6b5 | 115 | |
252b5132 RH |
116 | /* We need to keep some local information on symbols. */ |
117 | ||
69b97547 | 118 | #define TC_SYMFIELD_TYPE unsigned int |
174419c1 ILT |
119 | #define ARM_GET_FLAG(s) (*symbol_get_tc (s)) |
120 | #define ARM_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v)) | |
121 | #define ARM_RESET_FLAG(s,v) (*symbol_get_tc (s) &= ~(v)) | |
252b5132 RH |
122 | |
123 | #define ARM_FLAG_THUMB (1 << 0) /* The symbol is a Thumb symbol rather than an Arm symbol. */ | |
2d2255b5 | 124 | #define ARM_FLAG_INTERWORK (1 << 1) /* The symbol is attached to code that supports interworking. */ |
252b5132 RH |
125 | #define THUMB_FLAG_FUNC (1 << 2) /* The symbol is attached to the start of a Thumb function. */ |
126 | ||
127 | #define ARM_IS_THUMB(s) (ARM_GET_FLAG (s) & ARM_FLAG_THUMB) | |
128 | #define ARM_IS_INTERWORK(s) (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK) | |
e07e6e58 | 129 | |
e1da3f5b PB |
130 | #ifdef OBJ_ELF |
131 | ||
132 | /* For ELF objects THUMB_IS_FUNC is inferred from | |
267bf995 | 133 | ARM_IS_THUMB and the function type. */ |
63b33ceb NC |
134 | #define THUMB_IS_FUNC(s) \ |
135 | ((s) != NULL \ | |
136 | && ((arm_is_eabi () \ | |
137 | && (ARM_IS_THUMB (s)) \ | |
138 | && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) \ | |
139 | || (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC))) | |
140 | ||
141 | #define ARM_IS_FUNC(s) \ | |
142 | (((s) != NULL \ | |
143 | && arm_is_eabi () \ | |
144 | && !(ARM_IS_THUMB (s)) \ | |
145 | /* && !(THUMB_FLAG_FUNC & ARM_GET_FLAG (s)) \ */ \ | |
267bf995 RR |
146 | && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))) |
147 | ||
148 | ||
e1da3f5b | 149 | #else |
e07e6e58 | 150 | |
63b33ceb | 151 | #define THUMB_IS_FUNC(s) ((s) && ARM_GET_FLAG (s) & THUMB_FLAG_FUNC) |
267bf995 | 152 | #define ARM_IS_FUNC(s) (!THUMB_IS_FUNC (s) \ |
63b33ceb | 153 | && (s) && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) |
e1da3f5b | 154 | #endif |
252b5132 RH |
155 | |
156 | #define ARM_SET_THUMB(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB) : ARM_RESET_FLAG (s, ARM_FLAG_THUMB)) | |
157 | #define ARM_SET_INTERWORK(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK)) | |
158 | #define THUMB_SET_FUNC(s,t) ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC) : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC)) | |
159 | ||
794ba86a | 160 | void arm_copy_symbol_attributes (symbolS *, symbolS *); |
e07e6e58 | 161 | |
794ba86a DJ |
162 | #ifndef TC_COPY_SYMBOL_ATTRIBUTES |
163 | #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \ | |
164 | (arm_copy_symbol_attributes (DEST, SRC)) | |
165 | #endif | |
166 | ||
2e57ce7b AM |
167 | #define TC_START_LABEL(STR, NUL_CHAR, NEXT_CHAR) \ |
168 | (NEXT_CHAR == ':' || (NEXT_CHAR == '/' && arm_data_in_code ())) | |
69b97547 NC |
169 | #define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str); |
170 | #define obj_adjust_symtab() arm_adjust_symtab () | |
252b5132 RH |
171 | |
172 | #define LISTING_HEADER "ARM GAS " | |
173 | ||
174 | #define OPTIONAL_REGISTER_PREFIX '%' | |
175 | ||
37f6032b ZW |
176 | #define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L') |
177 | #define LOCAL_LABELS_FB 1 | |
252b5132 | 178 | |
a161fe53 AM |
179 | /* This expression evaluates to true if the relocation is for a local |
180 | object for which we still want to do the relocation at runtime. | |
181 | False if we are willing to perform this relocation while building | |
182 | the .o file. GOTOFF does not need to be checked here because it is | |
183 | not pcrel. I am not sure if some of the others are ever used with | |
252b5132 RH |
184 | pcrel, but it is easier to be safe than sorry. */ |
185 | ||
a161fe53 | 186 | #define TC_FORCE_RELOCATION_LOCAL(FIX) \ |
91cb9803 | 187 | (GENERIC_FORCE_RELOCATION_LOCAL (FIX) \ |
a161fe53 AM |
188 | || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32 \ |
189 | || (FIX)->fx_r_type == BFD_RELOC_32 \ | |
91cb9803 AM |
190 | || ((FIX)->fx_addsy != NULL \ |
191 | && S_IS_WEAK ((FIX)->fx_addsy))) | |
252b5132 | 192 | |
a8bc6c78 PB |
193 | /* Force output of R_ARM_REL32 relocations against thumb function symbols. |
194 | This is needed to ensure the low bit is handled correctly. */ | |
195 | #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ | |
91cb9803 AM |
196 | (GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEG) \ |
197 | || THUMB_IS_FUNC ((FIX)->fx_addsy)) | |
a8bc6c78 | 198 | |
6e7ce2cd PB |
199 | #define TC_FORCE_RELOCATION_ABS(FIX) \ |
200 | (((FIX)->fx_pcrel \ | |
201 | && (FIX)->fx_r_type != BFD_RELOC_32 \ | |
202 | && (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32) \ | |
203 | || TC_FORCE_RELOCATION(FIX)) | |
204 | ||
252b5132 | 205 | #define TC_CONS_FIX_NEW cons_fix_new_arm |
16a0c2d4 | 206 | |
140033b3 NC |
207 | #define MAX_MEM_ALIGNMENT_BYTES 6 |
208 | #define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1) | |
d8708f40 | 209 | |
16a0c2d4 NC |
210 | /* For frags in code sections we need to record whether they contain |
211 | ARM code or THUMB code. This is that if they have to be aligned, | |
212 | they can contain the correct type of no-op instruction. */ | |
cd000bff DJ |
213 | struct arm_frag_type |
214 | { | |
215 | int thumb_mode; | |
216 | #ifdef OBJ_ELF | |
217 | /* If there is a mapping symbol at offset 0 in this frag, | |
218 | it will be saved in FIRST_MAP. If there are any mapping | |
219 | symbols in this frag, the last one will be saved in | |
220 | LAST_MAP. */ | |
221 | symbolS *first_map, *last_map; | |
222 | #endif | |
223 | }; | |
224 | ||
7a5c933c RE |
225 | static inline int |
226 | arm_min (int am_p1, int am_p2) | |
227 | { | |
228 | return am_p1 < am_p2 ? am_p1 : am_p2; | |
229 | } | |
230 | ||
cd000bff DJ |
231 | #define TC_FRAG_TYPE struct arm_frag_type |
232 | /* NOTE: max_chars is a local variable from frag_var / frag_variant. */ | |
233 | #define TC_FRAG_INIT(fragp) arm_init_frag (fragp, max_chars) | |
db2ed2e0 | 234 | #define TC_ALIGN_ZERO_IS_DEFAULT 1 |
69b97547 | 235 | #define HANDLE_ALIGN(fragp) arm_handle_align (fragp) |
f27c5390 NC |
236 | /* PR gas/19276: COFF/PE segment alignment is already handled in coff_frob_section(). */ |
237 | #ifndef TE_PE | |
238 | #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \ | |
7a5c933c RE |
239 | ((!(FRCHAIN)->frch_next && subseg_text_p (SEG)) \ |
240 | ? arm_min (2, get_recorded_alignment (SEG)) : 0) | |
f27c5390 | 241 | #endif |
16a0c2d4 NC |
242 | |
243 | #define md_do_align(N, FILL, LEN, MAX, LABEL) \ | |
244 | if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \ | |
245 | { \ | |
246 | arm_frag_align_code (N, MAX); \ | |
247 | goto LABEL; \ | |
248 | } | |
69b97547 | 249 | |
f0927246 NC |
250 | #define DWARF2_LINE_MIN_INSN_LENGTH 2 |
251 | ||
252 | /* The lr register is r14. */ | |
253 | #define DWARF2_DEFAULT_RETURN_COLUMN 14 | |
254 | ||
255 | /* Registers are generally saved at negative offsets to the CFA. */ | |
8d79fd44 | 256 | #define DWARF2_CIE_DATA_ALIGNMENT (-4) |
f0927246 | 257 | |
e07e6e58 NC |
258 | /* State variables for IT block handling. */ |
259 | enum it_state | |
260 | { | |
261 | OUTSIDE_IT_BLOCK, MANUAL_IT_BLOCK, AUTOMATIC_IT_BLOCK | |
262 | }; | |
263 | struct current_it | |
264 | { | |
265 | int mask; | |
266 | enum it_state state; | |
267 | int cc; | |
268 | int block_length; | |
269 | char *insn; | |
270 | int state_handled; | |
5a01bb1d MGD |
271 | int warn_deprecated; |
272 | int insn_cond; | |
e07e6e58 NC |
273 | }; |
274 | ||
69b97547 | 275 | #ifdef OBJ_ELF |
69b97547 NC |
276 | # define obj_frob_symbol(sym, punt) armelf_frob_symbol ((sym), & (punt)) |
277 | # define md_elf_section_change_hook() arm_elf_change_section () | |
40a18ebd | 278 | # define md_elf_section_type(str, len) arm_elf_section_type (str, len) |
69b97547 | 279 | # define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" |
84798bd6 | 280 | # define TC_SEGMENT_INFO_TYPE struct arm_segment_info_type |
69b97547 | 281 | |
e821645d DJ |
282 | /* This is not really an alignment operation, but it's something we |
283 | need to do at the same time: whenever we are figuring out the | |
284 | alignment for data, we should check whether a $d symbol is | |
285 | necessary. */ | |
286 | # define md_cons_align(nbytes) mapping_state (MAP_DATA) | |
287 | ||
69b97547 NC |
288 | enum mstate |
289 | { | |
290 | MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections. */ | |
291 | MAP_DATA, | |
292 | MAP_ARM, | |
293 | MAP_THUMB | |
294 | }; | |
295 | ||
e821645d DJ |
296 | void mapping_state (enum mstate); |
297 | ||
84798bd6 JB |
298 | struct arm_segment_info_type |
299 | { | |
300 | enum mstate mapstate; | |
940b5ce0 DJ |
301 | |
302 | /* Bit N indicates that an R_ARM_NONE relocation has been output for | |
303 | __aeabi_unwind_cpp_prN already if set. This enables dependencies to be | |
304 | emitted only once per section, to save unnecessary bloat. */ | |
84798bd6 | 305 | unsigned int marked_pr_dependency; |
940b5ce0 | 306 | |
e07e6e58 | 307 | struct current_it current_it; |
84798bd6 JB |
308 | }; |
309 | ||
a394c00f NC |
310 | /* We want .cfi_* pseudo-ops for generating unwind info. */ |
311 | #define TARGET_USE_CFIPOP 1 | |
312 | ||
a394c00f NC |
313 | /* CFI hooks. */ |
314 | #define tc_regname_to_dw2regnum tc_arm_regname_to_dw2regnum | |
315 | #define tc_cfi_frame_initial_instructions tc_arm_frame_initial_instructions | |
316 | ||
69b97547 NC |
317 | #else /* Not OBJ_ELF. */ |
318 | #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_" | |
319 | #endif | |
320 | ||
321 | #if defined OBJ_ELF || defined OBJ_COFF | |
322 | ||
323 | # define EXTERN_FORCE_RELOC 1 | |
324 | # define tc_fix_adjustable(FIX) arm_fix_adjustable (FIX) | |
267bf995 RR |
325 | #endif |
326 | ||
327 | #ifdef OBJ_ELF | |
55cf6793 | 328 | /* Values passed to md_apply_fix don't include the symbol value. */ |
93ef582d | 329 | # define MD_APPLY_SYM_VALUE(FIX) arm_apply_sym_value (FIX, this_segment) |
4343666d | 330 | #endif |
69b97547 | 331 | |
4343666d RR |
332 | #ifdef OBJ_COFF |
333 | # define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL) arm_validate_fix (FIX) | |
267bf995 RR |
334 | /* Values passed to md_apply_fix don't include the symbol value. */ |
335 | # define MD_APPLY_SYM_VALUE(FIX) 0 | |
69b97547 NC |
336 | #endif |
337 | ||
2fc8bdac ZW |
338 | #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S) |
339 | ||
340 | extern long md_pcrel_from_section (struct fix *, segT); | |
69b97547 NC |
341 | extern void arm_frag_align_code (int, int); |
342 | extern void arm_validate_fix (struct fix *); | |
343 | extern const char * elf32_arm_target_format (void); | |
344 | extern void arm_elf_change_section (void); | |
345 | extern int arm_force_relocation (struct fix *); | |
346 | extern void arm_cleanup (void); | |
347 | extern void arm_start_line_hook (void); | |
348 | extern void arm_frob_label (symbolS *); | |
349 | extern int arm_data_in_code (void); | |
350 | extern char * arm_canonicalize_symbol_name (char *); | |
351 | extern void arm_adjust_symtab (void); | |
352 | extern void armelf_frob_symbol (symbolS *, int *); | |
62ebcb5c AM |
353 | extern void cons_fix_new_arm (fragS *, int, int, expressionS *, |
354 | bfd_reloc_code_real_type); | |
cd000bff | 355 | extern void arm_init_frag (struct frag *, int); |
69b97547 NC |
356 | extern void arm_handle_align (struct frag *); |
357 | extern bfd_boolean arm_fix_adjustable (struct fix *); | |
40a18ebd | 358 | extern int arm_elf_section_type (const char *, size_t); |
1df69f4f | 359 | extern int tc_arm_regname_to_dw2regnum (char *regname); |
a394c00f | 360 | extern void tc_arm_frame_initial_instructions (void); |
f0927246 NC |
361 | |
362 | #ifdef TE_PE | |
363 | ||
364 | #define O_secrel O_md1 | |
365 | ||
366 | #define TC_DWARF2_EMIT_OFFSET tc_pe_dwarf2_emit_offset | |
367 | void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int); | |
368 | ||
369 | #endif /* TE_PE */ | |
e04befd0 | 370 | |
f31fef98 | 371 | #ifdef OBJ_ELF |
e04befd0 | 372 | #define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name) |
f31fef98 | 373 | extern int arm_convert_symbolic_attribute (const char *); |
93ef582d | 374 | extern int arm_apply_sym_value (struct fix *, segT); |
f31fef98 | 375 | #endif |
2e6976a8 DG |
376 | |
377 | #define tc_comment_chars arm_comment_chars | |
378 | extern char arm_comment_chars[]; | |
379 | ||
380 | #define tc_line_separator_chars arm_line_separator_chars | |
381 | extern char arm_line_separator_chars[]; | |
ae8714c2 NC |
382 | |
383 | #define TC_EQUAL_IN_INSN(c, s) arm_tc_equal_in_insn ((c), (s)) | |
384 | extern bfd_boolean arm_tc_equal_in_insn (int, char *); |