Commit | Line | Data |
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252b5132 | 1 | /* This file is tc-arm.h |
aef6203b | 2 | Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, |
f31fef98 | 3 | 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
252b5132 RH |
4 | Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org) |
5 | Modified by David Taylor (dtaylor@armltd.co.uk) | |
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 | |
ec2655a6 | 11 | the Free Software Foundation; either version 3, or (at your option) |
252b5132 RH |
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 | |
4b4da160 NC |
21 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
22 | 02110-1301, USA. */ | |
252b5132 RH |
23 | |
24 | #define TC_ARM 1 | |
25 | ||
26 | #ifndef TARGET_BYTES_BIG_ENDIAN | |
27 | #define TARGET_BYTES_BIG_ENDIAN 0 | |
28 | #endif | |
29 | ||
30 | #define WORKING_DOT_WORD | |
31 | ||
32 | #define COFF_MAGIC ARMMAGIC | |
33 | #define TARGET_ARCH bfd_arch_arm | |
34 | ||
252b5132 RH |
35 | #define DIFF_EXPR_OK |
36 | ||
37 | #ifdef LITTLE_ENDIAN | |
38 | #undef LITTLE_ENDIAN | |
39 | #endif | |
40 | ||
41 | #ifdef BIG_ENDIAN | |
42 | #undef BIG_ENDIAN | |
43 | #endif | |
44 | ||
45 | #define LITTLE_ENDIAN 1234 | |
46 | #define BIG_ENDIAN 4321 | |
47 | ||
a161fe53 AM |
48 | struct fix; |
49 | ||
69b97547 NC |
50 | #if defined OBJ_AOUT |
51 | # if defined TE_RISCIX | |
52 | # define TARGET_FORMAT "a.out-riscix" | |
53 | # elif defined TE_LINUX | |
54 | # define ARM_BI_ENDIAN | |
55 | # define TARGET_FORMAT "a.out-arm-linux" | |
56 | # elif defined TE_NetBSD | |
57 | # define TARGET_FORMAT "a.out-arm-netbsd" | |
58 | # else | |
59 | # define ARM_BI_ENDIAN | |
60 | # define TARGET_FORMAT (target_big_endian ? "a.out-arm-big" : "a.out-arm-little") | |
61 | # endif | |
62 | #elif defined OBJ_AIF | |
63 | # define TARGET_FORMAT "aif" | |
64 | #elif defined OBJ_COFF | |
252b5132 | 65 | # define ARM_BI_ENDIAN |
252b5132 | 66 | # if defined TE_PE |
69b97547 NC |
67 | # if defined TE_EPOC |
68 | # define TARGET_FORMAT (target_big_endian ? "epoc-pe-arm-big" : "epoc-pe-arm-little") | |
7148cc28 NC |
69 | # elif defined TE_WINCE |
70 | # define TARGET_FORMAT (target_big_endian ? "pe-arm-wince-big" : "pe-arm-wince-little") | |
69b97547 NC |
71 | # else |
72 | # define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little") | |
73 | # endif | |
252b5132 RH |
74 | # else |
75 | # define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little") | |
76 | # endif | |
69b97547 NC |
77 | #elif defined OBJ_ELF |
78 | # define ARM_BI_ENDIAN | |
79 | # define TARGET_FORMAT elf32_arm_target_format () | |
252b5132 RH |
80 | #endif |
81 | ||
114424c6 | 82 | #define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX) |
114424c6 | 83 | |
0110f2b8 | 84 | #define md_relax_frag(segment, fragp, stretch) \ |
e07e6e58 | 85 | arm_relax_frag (segment, fragp, stretch) |
0110f2b8 | 86 | extern int arm_relax_frag (asection *, struct frag *, long); |
252b5132 | 87 | |
a8bc6c78 PB |
88 | #define md_optimize_expr(l,o,r) arm_optimize_expr (l, o, r) |
89 | extern int arm_optimize_expr (expressionS *, operatorT, expressionS *); | |
90 | ||
252b5132 | 91 | #define md_cleanup() arm_cleanup () |
252b5132 RH |
92 | |
93 | #define md_start_line_hook() arm_start_line_hook () | |
252b5132 RH |
94 | |
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); |
ee065d83 PB |
104 | #endif |
105 | ||
252b5132 RH |
106 | /* NOTE: The fake label creation in stabs.c:s_stab_generic() has |
107 | deliberately not been updated to mark assembler created stabs | |
108 | symbols as Thumb. */ | |
109 | ||
adbaf948 ZW |
110 | #define TC_FIX_TYPE int |
111 | #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0) | |
29c4c6b5 | 112 | |
252b5132 RH |
113 | /* We need to keep some local information on symbols. */ |
114 | ||
69b97547 | 115 | #define TC_SYMFIELD_TYPE unsigned int |
174419c1 ILT |
116 | #define ARM_GET_FLAG(s) (*symbol_get_tc (s)) |
117 | #define ARM_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v)) | |
118 | #define ARM_RESET_FLAG(s,v) (*symbol_get_tc (s) &= ~(v)) | |
252b5132 RH |
119 | |
120 | #define ARM_FLAG_THUMB (1 << 0) /* The symbol is a Thumb symbol rather than an Arm symbol. */ | |
2d2255b5 | 121 | #define ARM_FLAG_INTERWORK (1 << 1) /* The symbol is attached to code that supports interworking. */ |
252b5132 RH |
122 | #define THUMB_FLAG_FUNC (1 << 2) /* The symbol is attached to the start of a Thumb function. */ |
123 | ||
124 | #define ARM_IS_THUMB(s) (ARM_GET_FLAG (s) & ARM_FLAG_THUMB) | |
125 | #define ARM_IS_INTERWORK(s) (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK) | |
e07e6e58 | 126 | |
e1da3f5b PB |
127 | #ifdef OBJ_ELF |
128 | ||
129 | /* For ELF objects THUMB_IS_FUNC is inferred from | |
267bf995 | 130 | ARM_IS_THUMB and the function type. */ |
63b33ceb NC |
131 | #define THUMB_IS_FUNC(s) \ |
132 | ((s) != NULL \ | |
133 | && ((arm_is_eabi () \ | |
134 | && (ARM_IS_THUMB (s)) \ | |
135 | && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) \ | |
136 | || (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC))) | |
137 | ||
138 | #define ARM_IS_FUNC(s) \ | |
139 | (((s) != NULL \ | |
140 | && arm_is_eabi () \ | |
141 | && !(ARM_IS_THUMB (s)) \ | |
142 | /* && !(THUMB_FLAG_FUNC & ARM_GET_FLAG (s)) \ */ \ | |
267bf995 RR |
143 | && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))) |
144 | ||
145 | ||
e1da3f5b | 146 | #else |
e07e6e58 | 147 | |
63b33ceb | 148 | #define THUMB_IS_FUNC(s) ((s) && ARM_GET_FLAG (s) & THUMB_FLAG_FUNC) |
267bf995 | 149 | #define ARM_IS_FUNC(s) (!THUMB_IS_FUNC (s) \ |
63b33ceb | 150 | && (s) && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) |
e1da3f5b | 151 | #endif |
252b5132 RH |
152 | |
153 | #define ARM_SET_THUMB(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB) : ARM_RESET_FLAG (s, ARM_FLAG_THUMB)) | |
154 | #define ARM_SET_INTERWORK(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK)) | |
155 | #define THUMB_SET_FUNC(s,t) ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC) : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC)) | |
156 | ||
794ba86a | 157 | void arm_copy_symbol_attributes (symbolS *, symbolS *); |
e07e6e58 | 158 | |
794ba86a DJ |
159 | #ifndef TC_COPY_SYMBOL_ATTRIBUTES |
160 | #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \ | |
161 | (arm_copy_symbol_attributes (DEST, SRC)) | |
162 | #endif | |
163 | ||
5e8c8f8f | 164 | #define TC_START_LABEL(C,S,STR) (C == ':' || (C == '/' && arm_data_in_code ())) |
69b97547 NC |
165 | #define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str); |
166 | #define obj_adjust_symtab() arm_adjust_symtab () | |
252b5132 RH |
167 | |
168 | #define LISTING_HEADER "ARM GAS " | |
169 | ||
170 | #define OPTIONAL_REGISTER_PREFIX '%' | |
171 | ||
37f6032b ZW |
172 | #define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L') |
173 | #define LOCAL_LABELS_FB 1 | |
252b5132 | 174 | |
a161fe53 AM |
175 | /* This expression evaluates to true if the relocation is for a local |
176 | object for which we still want to do the relocation at runtime. | |
177 | False if we are willing to perform this relocation while building | |
178 | the .o file. GOTOFF does not need to be checked here because it is | |
179 | not pcrel. I am not sure if some of the others are ever used with | |
252b5132 RH |
180 | pcrel, but it is easier to be safe than sorry. */ |
181 | ||
a161fe53 AM |
182 | #define TC_FORCE_RELOCATION_LOCAL(FIX) \ |
183 | (!(FIX)->fx_pcrel \ | |
a161fe53 AM |
184 | || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32 \ |
185 | || (FIX)->fx_r_type == BFD_RELOC_32 \ | |
1fc5d88e | 186 | || ((FIX)->fx_addsy != NULL && S_IS_WEAK ((FIX)->fx_addsy)) \ |
a161fe53 | 187 | || TC_FORCE_RELOCATION (FIX)) |
252b5132 | 188 | |
a8bc6c78 PB |
189 | /* Force output of R_ARM_REL32 relocations against thumb function symbols. |
190 | This is needed to ensure the low bit is handled correctly. */ | |
191 | #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ | |
192 | (THUMB_IS_FUNC ((FIX)->fx_addsy) \ | |
193 | || !SEG_NORMAL (SEG)) | |
194 | ||
252b5132 | 195 | #define TC_CONS_FIX_NEW cons_fix_new_arm |
16a0c2d4 | 196 | |
140033b3 NC |
197 | #define MAX_MEM_ALIGNMENT_BYTES 6 |
198 | #define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1) | |
d8708f40 | 199 | |
16a0c2d4 NC |
200 | /* For frags in code sections we need to record whether they contain |
201 | ARM code or THUMB code. This is that if they have to be aligned, | |
202 | they can contain the correct type of no-op instruction. */ | |
cd000bff DJ |
203 | struct arm_frag_type |
204 | { | |
205 | int thumb_mode; | |
206 | #ifdef OBJ_ELF | |
207 | /* If there is a mapping symbol at offset 0 in this frag, | |
208 | it will be saved in FIRST_MAP. If there are any mapping | |
209 | symbols in this frag, the last one will be saved in | |
210 | LAST_MAP. */ | |
211 | symbolS *first_map, *last_map; | |
212 | #endif | |
213 | }; | |
214 | ||
215 | #define TC_FRAG_TYPE struct arm_frag_type | |
216 | /* NOTE: max_chars is a local variable from frag_var / frag_variant. */ | |
217 | #define TC_FRAG_INIT(fragp) arm_init_frag (fragp, max_chars) | |
69b97547 | 218 | #define HANDLE_ALIGN(fragp) arm_handle_align (fragp) |
16a0c2d4 NC |
219 | |
220 | #define md_do_align(N, FILL, LEN, MAX, LABEL) \ | |
221 | if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \ | |
222 | { \ | |
223 | arm_frag_align_code (N, MAX); \ | |
224 | goto LABEL; \ | |
225 | } | |
69b97547 | 226 | |
f0927246 NC |
227 | #define DWARF2_LINE_MIN_INSN_LENGTH 2 |
228 | ||
229 | /* The lr register is r14. */ | |
230 | #define DWARF2_DEFAULT_RETURN_COLUMN 14 | |
231 | ||
232 | /* Registers are generally saved at negative offsets to the CFA. */ | |
8d79fd44 | 233 | #define DWARF2_CIE_DATA_ALIGNMENT (-4) |
f0927246 | 234 | |
e07e6e58 NC |
235 | /* State variables for IT block handling. */ |
236 | enum it_state | |
237 | { | |
238 | OUTSIDE_IT_BLOCK, MANUAL_IT_BLOCK, AUTOMATIC_IT_BLOCK | |
239 | }; | |
240 | struct current_it | |
241 | { | |
242 | int mask; | |
243 | enum it_state state; | |
244 | int cc; | |
245 | int block_length; | |
246 | char *insn; | |
247 | int state_handled; | |
248 | }; | |
249 | ||
69b97547 | 250 | #ifdef OBJ_ELF |
69b97547 NC |
251 | # define obj_frob_symbol(sym, punt) armelf_frob_symbol ((sym), & (punt)) |
252 | # define md_elf_section_change_hook() arm_elf_change_section () | |
40a18ebd | 253 | # define md_elf_section_type(str, len) arm_elf_section_type (str, len) |
69b97547 | 254 | # define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" |
84798bd6 | 255 | # define TC_SEGMENT_INFO_TYPE struct arm_segment_info_type |
69b97547 | 256 | |
e821645d DJ |
257 | /* This is not really an alignment operation, but it's something we |
258 | need to do at the same time: whenever we are figuring out the | |
259 | alignment for data, we should check whether a $d symbol is | |
260 | necessary. */ | |
261 | # define md_cons_align(nbytes) mapping_state (MAP_DATA) | |
262 | ||
69b97547 NC |
263 | enum mstate |
264 | { | |
265 | MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections. */ | |
266 | MAP_DATA, | |
267 | MAP_ARM, | |
268 | MAP_THUMB | |
269 | }; | |
270 | ||
e821645d DJ |
271 | void mapping_state (enum mstate); |
272 | ||
84798bd6 JB |
273 | struct arm_segment_info_type |
274 | { | |
275 | enum mstate mapstate; | |
940b5ce0 DJ |
276 | |
277 | /* Bit N indicates that an R_ARM_NONE relocation has been output for | |
278 | __aeabi_unwind_cpp_prN already if set. This enables dependencies to be | |
279 | emitted only once per section, to save unnecessary bloat. */ | |
84798bd6 | 280 | unsigned int marked_pr_dependency; |
940b5ce0 | 281 | |
e07e6e58 | 282 | struct current_it current_it; |
84798bd6 JB |
283 | }; |
284 | ||
a394c00f NC |
285 | /* We want .cfi_* pseudo-ops for generating unwind info. */ |
286 | #define TARGET_USE_CFIPOP 1 | |
287 | ||
a394c00f NC |
288 | /* CFI hooks. */ |
289 | #define tc_regname_to_dw2regnum tc_arm_regname_to_dw2regnum | |
290 | #define tc_cfi_frame_initial_instructions tc_arm_frame_initial_instructions | |
291 | ||
69b97547 NC |
292 | #else /* Not OBJ_ELF. */ |
293 | #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_" | |
294 | #endif | |
295 | ||
296 | #if defined OBJ_ELF || defined OBJ_COFF | |
297 | ||
298 | # define EXTERN_FORCE_RELOC 1 | |
299 | # define tc_fix_adjustable(FIX) arm_fix_adjustable (FIX) | |
267bf995 RR |
300 | #endif |
301 | ||
302 | #ifdef OBJ_ELF | |
55cf6793 | 303 | /* Values passed to md_apply_fix don't include the symbol value. */ |
267bf995 | 304 | # define MD_APPLY_SYM_VALUE(FIX) arm_apply_sym_value (FIX) |
4343666d | 305 | #endif |
69b97547 | 306 | |
4343666d RR |
307 | #ifdef OBJ_COFF |
308 | # define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL) arm_validate_fix (FIX) | |
267bf995 RR |
309 | /* Values passed to md_apply_fix don't include the symbol value. */ |
310 | # define MD_APPLY_SYM_VALUE(FIX) 0 | |
69b97547 NC |
311 | #endif |
312 | ||
2fc8bdac ZW |
313 | #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S) |
314 | ||
315 | extern long md_pcrel_from_section (struct fix *, segT); | |
69b97547 NC |
316 | extern void arm_frag_align_code (int, int); |
317 | extern void arm_validate_fix (struct fix *); | |
318 | extern const char * elf32_arm_target_format (void); | |
319 | extern void arm_elf_change_section (void); | |
320 | extern int arm_force_relocation (struct fix *); | |
321 | extern void arm_cleanup (void); | |
322 | extern void arm_start_line_hook (void); | |
323 | extern void arm_frob_label (symbolS *); | |
324 | extern int arm_data_in_code (void); | |
325 | extern char * arm_canonicalize_symbol_name (char *); | |
326 | extern void arm_adjust_symtab (void); | |
327 | extern void armelf_frob_symbol (symbolS *, int *); | |
328 | extern void cons_fix_new_arm (fragS *, int, int, expressionS *); | |
cd000bff | 329 | extern void arm_init_frag (struct frag *, int); |
69b97547 NC |
330 | extern void arm_handle_align (struct frag *); |
331 | extern bfd_boolean arm_fix_adjustable (struct fix *); | |
40a18ebd | 332 | extern int arm_elf_section_type (const char *, size_t); |
1df69f4f | 333 | extern int tc_arm_regname_to_dw2regnum (char *regname); |
a394c00f | 334 | extern void tc_arm_frame_initial_instructions (void); |
f0927246 NC |
335 | |
336 | #ifdef TE_PE | |
337 | ||
338 | #define O_secrel O_md1 | |
339 | ||
340 | #define TC_DWARF2_EMIT_OFFSET tc_pe_dwarf2_emit_offset | |
341 | void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int); | |
342 | ||
343 | #endif /* TE_PE */ | |
e04befd0 | 344 | |
f31fef98 | 345 | #ifdef OBJ_ELF |
e04befd0 | 346 | #define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name) |
f31fef98 | 347 | extern int arm_convert_symbolic_attribute (const char *); |
267bf995 | 348 | extern int arm_apply_sym_value (struct fix *); |
f31fef98 | 349 | #endif |