source: binutils/trunk/gas/config/tc-arm.h@ 1973

Last change on this file since 1973 was 1973, checked in by Silvan Scherrer, 8 years ago

binutils: update trunk to version 2.27
File size: 12.9 KB
Line 
1/* This file is tc-arm.h
2 Copyright (C) 1994-2016 Free Software Foundation, Inc.
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
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#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
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
47struct fix;
48
49#if defined OBJ_AOUT
50# if defined TE_RISCIX
51# define TARGET_FORMAT "a.out-riscix"
52# elif defined TE_LINUX
53# define ARM_BI_ENDIAN
54# define TARGET_FORMAT "a.out-arm-linux"
55# elif defined TE_NetBSD
56# define TARGET_FORMAT "a.out-arm-netbsd"
57# else
58# define ARM_BI_ENDIAN
59# define TARGET_FORMAT (target_big_endian ? "a.out-arm-big" : "a.out-arm-little")
60# endif
61#elif defined OBJ_AIF
62# define TARGET_FORMAT "aif"
63#elif defined OBJ_COFF
64# define ARM_BI_ENDIAN
65# if defined TE_PE
66# if defined TE_EPOC
67# define TARGET_FORMAT (target_big_endian ? "epoc-pe-arm-big" : "epoc-pe-arm-little")
68# elif defined TE_WINCE
69# define TARGET_FORMAT (target_big_endian ? "pe-arm-wince-big" : "pe-arm-wince-little")
70# else
71# define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little")
72# endif
73# else
74# define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little")
75# endif
76#elif defined OBJ_ELF
77# define ARM_BI_ENDIAN
78# define TARGET_FORMAT elf32_arm_target_format ()
79#endif
80
81/* We support double slash line-comments for compatibility with the ARM AArch64 Assembler. */
82#define DOUBLESLASH_LINE_COMMENTS
83
84/* We conditionally support labels without a colon. */
85#define LABELS_WITHOUT_COLONS codecomposer_syntax
86extern bfd_boolean codecomposer_syntax;
87
88#define tc_symbol_chars arm_symbol_chars
89extern const char arm_symbol_chars[];
90
91#define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX)
92
93extern unsigned int arm_frag_max_var (struct frag *);
94#define md_frag_max_var arm_frag_max_var
95
96#define md_relax_frag(segment, fragp, stretch) \
97 arm_relax_frag (segment, fragp, stretch)
98extern int arm_relax_frag (asection *, struct frag *, long);
99
100#define md_optimize_expr(l,o,r) arm_optimize_expr (l, o, r)
101extern int arm_optimize_expr (expressionS *, operatorT, expressionS *);
102
103#define md_cleanup() arm_cleanup ()
104
105#define md_start_line_hook() arm_start_line_hook ()
106
107#define TC_START_LABEL_WITHOUT_COLON(NUL_CHAR, NEXT_CHAR) \
108 tc_start_label_without_colon ()
109extern bfd_boolean tc_start_label_without_colon (void);
110
111#define tc_frob_label(S) arm_frob_label (S)
112
113/* We also need to mark assembler created symbols: */
114#define tc_frob_fake_label(S) arm_frob_label (S)
115
116#ifdef OBJ_ELF
117#define md_end arm_md_end
118extern void arm_md_end (void);
119bfd_boolean arm_is_eabi (void);
120
121#define md_post_relax_hook aeabi_set_public_attributes ()
122extern void aeabi_set_public_attributes (void);
123#endif
124
125/* NOTE: The fake label creation in stabs.c:s_stab_generic() has
126 deliberately not been updated to mark assembler created stabs
127 symbols as Thumb. */
128
129#define TC_FIX_TYPE int
130#define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0)
131
132/* We need to keep some local information on symbols. */
133
134#define TC_SYMFIELD_TYPE unsigned int
135#define ARM_GET_FLAG(s) (*symbol_get_tc (s))
136#define ARM_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v))
137#define ARM_RESET_FLAG(s,v) (*symbol_get_tc (s) &= ~(v))
138
139#define ARM_FLAG_THUMB (1 << 0) /* The symbol is a Thumb symbol rather than an Arm symbol. */
140#define ARM_FLAG_INTERWORK (1 << 1) /* The symbol is attached to code that supports interworking. */
141#define THUMB_FLAG_FUNC (1 << 2) /* The symbol is attached to the start of a Thumb function. */
142
143#define ARM_IS_THUMB(s) (ARM_GET_FLAG (s) & ARM_FLAG_THUMB)
144#define ARM_IS_INTERWORK(s) (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK)
145
146#ifdef OBJ_ELF
147
148/* For ELF objects THUMB_IS_FUNC is inferred from
149 ARM_IS_THUMB and the function type. */
150#define THUMB_IS_FUNC(s) \
151 ((s) != NULL \
152 && ((arm_is_eabi () \
153 && (ARM_IS_THUMB (s)) \
154 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) \
155 || (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)))
156
157#define ARM_IS_FUNC(s) \
158 (((s) != NULL \
159 && arm_is_eabi () \
160 && !(ARM_IS_THUMB (s)) \
161 /* && !(THUMB_FLAG_FUNC & ARM_GET_FLAG (s)) \ */ \
162 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)))
163
164
165#else
166
167#define THUMB_IS_FUNC(s) ((s) && ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)
168#define ARM_IS_FUNC(s) (!THUMB_IS_FUNC (s) \
169 && (s) && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))
170#endif
171
172#define ARM_SET_THUMB(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB) : ARM_RESET_FLAG (s, ARM_FLAG_THUMB))
173#define ARM_SET_INTERWORK(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK))
174#define THUMB_SET_FUNC(s,t) ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC) : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC))
175
176void arm_copy_symbol_attributes (symbolS *, symbolS *);
177
178#ifndef TC_COPY_SYMBOL_ATTRIBUTES
179#define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
180 (arm_copy_symbol_attributes (DEST, SRC))
181#endif
182
183#define TC_START_LABEL(STR, NUL_CHAR, NEXT_CHAR) \
184 (NEXT_CHAR == ':' || (NEXT_CHAR == '/' && arm_data_in_code ()))
185#define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str);
186#define obj_adjust_symtab() arm_adjust_symtab ()
187
188#define LISTING_HEADER "ARM GAS "
189
190#define OPTIONAL_REGISTER_PREFIX '%'
191
192#define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L')
193#define LOCAL_LABELS_FB 1
194
195/* This expression evaluates to true if the relocation is for a local
196 object for which we still want to do the relocation at runtime.
197 False if we are willing to perform this relocation while building
198 the .o file. GOTOFF does not need to be checked here because it is
199 not pcrel. I am not sure if some of the others are ever used with
200 pcrel, but it is easier to be safe than sorry. */
201
202#define TC_FORCE_RELOCATION_LOCAL(FIX) \
203 (!(FIX)->fx_pcrel \
204 || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32 \
205 || (FIX)->fx_r_type == BFD_RELOC_32 \
206 || ((FIX)->fx_addsy != NULL && S_IS_WEAK ((FIX)->fx_addsy)) \
207 || TC_FORCE_RELOCATION (FIX))
208
209/* Force output of R_ARM_REL32 relocations against thumb function symbols.
210 This is needed to ensure the low bit is handled correctly. */
211#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
212 (THUMB_IS_FUNC ((FIX)->fx_addsy) \
213 || !SEG_NORMAL (SEG))
214
215#define TC_FORCE_RELOCATION_ABS(FIX) \
216 (((FIX)->fx_pcrel \
217 && (FIX)->fx_r_type != BFD_RELOC_32 \
218 && (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32) \
219 || TC_FORCE_RELOCATION(FIX))
220
221#define TC_CONS_FIX_NEW cons_fix_new_arm
222
223#define MAX_MEM_ALIGNMENT_BYTES 6
224#define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1)
225
226/* For frags in code sections we need to record whether they contain
227 ARM code or THUMB code. This is that if they have to be aligned,
228 they can contain the correct type of no-op instruction. */
229struct arm_frag_type
230{
231 int thumb_mode;
232#ifdef OBJ_ELF
233 /* If there is a mapping symbol at offset 0 in this frag,
234 it will be saved in FIRST_MAP. If there are any mapping
235 symbols in this frag, the last one will be saved in
236 LAST_MAP. */
237 symbolS *first_map, *last_map;
238#endif
239};
240
241static inline int
242arm_min (int am_p1, int am_p2)
243{
244 return am_p1 < am_p2 ? am_p1 : am_p2;
245}
246
247#define TC_FRAG_TYPE struct arm_frag_type
248/* NOTE: max_chars is a local variable from frag_var / frag_variant. */
249#define TC_FRAG_INIT(fragp) arm_init_frag (fragp, max_chars)
250#define TC_ALIGN_ZERO_IS_DEFAULT 1
251#define HANDLE_ALIGN(fragp) arm_handle_align (fragp)
252/* PR gas/19276: COFF/PE segment alignment is already handled in coff_frob_section(). */
253#ifndef TE_PE
254#define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
255 ((!(FRCHAIN)->frch_next && subseg_text_p (SEG)) \
256 ? arm_min (2, get_recorded_alignment (SEG)) : 0)
257#endif
258
259#define md_do_align(N, FILL, LEN, MAX, LABEL) \
260 if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \
261 { \
262 arm_frag_align_code (N, MAX); \
263 goto LABEL; \
264 }
265
266#define DWARF2_LINE_MIN_INSN_LENGTH 2
267
268/* The lr register is r14. */
269#define DWARF2_DEFAULT_RETURN_COLUMN 14
270
271/* Registers are generally saved at negative offsets to the CFA. */
272#define DWARF2_CIE_DATA_ALIGNMENT (-4)
273
274/* State variables for IT block handling. */
275enum it_state
276{
277 OUTSIDE_IT_BLOCK, MANUAL_IT_BLOCK, AUTOMATIC_IT_BLOCK
278};
279struct current_it
280{
281 int mask;
282 enum it_state state;
283 int cc;
284 int block_length;
285 char *insn;
286 int state_handled;
287 int warn_deprecated;
288 int insn_cond;
289};
290
291#ifdef OBJ_ELF
292# define obj_frob_symbol(sym, punt) armelf_frob_symbol ((sym), & (punt))
293# define md_elf_section_change_hook() arm_elf_change_section ()
294# define md_elf_section_type(str, len) arm_elf_section_type (str, len)
295# define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
296# define TC_SEGMENT_INFO_TYPE struct arm_segment_info_type
297
298/* This is not really an alignment operation, but it's something we
299 need to do at the same time: whenever we are figuring out the
300 alignment for data, we should check whether a $d symbol is
301 necessary. */
302# define md_cons_align(nbytes) mapping_state (MAP_DATA)
303
304enum mstate
305{
306 MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections. */
307 MAP_DATA,
308 MAP_ARM,
309 MAP_THUMB
310};
311
312void mapping_state (enum mstate);
313
314struct arm_segment_info_type
315{
316 enum mstate mapstate;
317
318 /* Bit N indicates that an R_ARM_NONE relocation has been output for
319 __aeabi_unwind_cpp_prN already if set. This enables dependencies to be
320 emitted only once per section, to save unnecessary bloat. */
321 unsigned int marked_pr_dependency;
322
323 struct current_it current_it;
324};
325
326/* We want .cfi_* pseudo-ops for generating unwind info. */
327#define TARGET_USE_CFIPOP 1
328
329/* CFI hooks. */
330#define tc_regname_to_dw2regnum tc_arm_regname_to_dw2regnum
331#define tc_cfi_frame_initial_instructions tc_arm_frame_initial_instructions
332
333#else /* Not OBJ_ELF. */
334#define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
335#endif
336
337#if defined OBJ_ELF || defined OBJ_COFF
338
339# define EXTERN_FORCE_RELOC 1
340# define tc_fix_adjustable(FIX) arm_fix_adjustable (FIX)
341#endif
342
343#ifdef OBJ_ELF
344/* Values passed to md_apply_fix don't include the symbol value. */
345# define MD_APPLY_SYM_VALUE(FIX) arm_apply_sym_value (FIX, this_segment)
346#endif
347
348#ifdef OBJ_COFF
349# define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL) arm_validate_fix (FIX)
350/* Values passed to md_apply_fix don't include the symbol value. */
351# define MD_APPLY_SYM_VALUE(FIX) 0
352#endif
353
354#define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
355
356extern long md_pcrel_from_section (struct fix *, segT);
357extern void arm_frag_align_code (int, int);
358extern void arm_validate_fix (struct fix *);
359extern const char * elf32_arm_target_format (void);
360extern void arm_elf_change_section (void);
361extern int arm_force_relocation (struct fix *);
362extern void arm_cleanup (void);
363extern void arm_start_line_hook (void);
364extern void arm_frob_label (symbolS *);
365extern int arm_data_in_code (void);
366extern char * arm_canonicalize_symbol_name (char *);
367extern void arm_adjust_symtab (void);
368extern void armelf_frob_symbol (symbolS *, int *);
369extern void cons_fix_new_arm (fragS *, int, int, expressionS *,
370 bfd_reloc_code_real_type);
371extern void arm_init_frag (struct frag *, int);
372extern void arm_handle_align (struct frag *);
373extern bfd_boolean arm_fix_adjustable (struct fix *);
374extern int arm_elf_section_type (const char *, size_t);
375extern int tc_arm_regname_to_dw2regnum (char *regname);
376extern void tc_arm_frame_initial_instructions (void);
377
378#ifdef TE_PE
379
380#define O_secrel O_md1
381
382#define TC_DWARF2_EMIT_OFFSET tc_pe_dwarf2_emit_offset
383void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
384
385#endif /* TE_PE */
386
387#ifdef OBJ_ELF
388#define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name)
389extern int arm_convert_symbolic_attribute (const char *);
390extern int arm_apply_sym_value (struct fix *, segT);
391#endif
392
393#define tc_comment_chars arm_comment_chars
394extern char arm_comment_chars[];
395
396#define tc_line_separator_chars arm_line_separator_chars
397extern char arm_line_separator_chars[];
398
399#define TC_EQUAL_IN_INSN(c, s) arm_tc_equal_in_insn ((c), (s))
400extern bfd_boolean arm_tc_equal_in_insn (int, char *);
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