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)
6 This file is part of GAS, the GNU Assembler.
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)
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.
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
25 #ifndef TARGET_BYTES_BIG_ENDIAN
26 #define TARGET_BYTES_BIG_ENDIAN 0
29 #define WORKING_DOT_WORD
31 #define COFF_MAGIC ARMMAGIC
32 #define TARGET_ARCH bfd_arch_arm
44 #define LITTLE_ENDIAN 1234
45 #define BIG_ENDIAN 4321
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"
58 # define ARM_BI_ENDIAN
59 # define TARGET_FORMAT (target_big_endian ? "a.out-arm-big" : "a.out-arm-little")
62 # define TARGET_FORMAT "aif"
63 #elif defined OBJ_COFF
64 # define ARM_BI_ENDIAN
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")
71 # define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little")
74 # define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little")
77 # define ARM_BI_ENDIAN
78 # define TARGET_FORMAT elf32_arm_target_format ()
81 /* We support double slash line-comments for compatibility with the ARM AArch64 Assembler. */
82 #define DOUBLESLASH_LINE_COMMENTS
84 /* We conditionally support labels without a colon. */
85 #define LABELS_WITHOUT_COLONS codecomposer_syntax
86 extern bfd_boolean codecomposer_syntax
;
88 #define tc_symbol_chars arm_symbol_chars
89 extern const char arm_symbol_chars
[];
91 #define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX)
93 extern unsigned int arm_frag_max_var (struct frag
*);
94 #define md_frag_max_var arm_frag_max_var
96 #define md_relax_frag(segment, fragp, stretch) \
97 arm_relax_frag (segment, fragp, stretch)
98 extern int arm_relax_frag (asection
*, struct frag
*, long);
100 #define md_optimize_expr(l,o,r) arm_optimize_expr (l, o, r)
101 extern int arm_optimize_expr (expressionS
*, operatorT
, expressionS
*);
103 #define md_cleanup() arm_cleanup ()
105 #define md_start_line_hook() arm_start_line_hook ()
107 #define TC_START_LABEL_WITHOUT_COLON(NUL_CHAR, NEXT_CHAR) \
108 tc_start_label_without_colon ()
109 extern bfd_boolean
tc_start_label_without_colon (void);
111 #define tc_frob_label(S) arm_frob_label (S)
113 /* We also need to mark assembler created symbols: */
114 #define tc_frob_fake_label(S) arm_frob_label (S)
117 #define md_end arm_md_end
118 extern void arm_md_end (void);
119 bfd_boolean
arm_is_eabi (void);
121 #define md_post_relax_hook aeabi_set_public_attributes ()
122 extern void aeabi_set_public_attributes (void);
125 /* NOTE: The fake label creation in stabs.c:s_stab_generic() has
126 deliberately not been updated to mark assembler created stabs
129 #define TC_FIX_TYPE int
130 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0)
132 /* We need to keep some local information on symbols. */
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))
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. */
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)
148 /* For ELF objects THUMB_IS_FUNC is inferred from
149 ARM_IS_THUMB and the function type. */
150 #define THUMB_IS_FUNC(s) \
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)))
157 #define ARM_IS_FUNC(s) \
160 && !(ARM_IS_THUMB (s)) \
161 /* && !(THUMB_FLAG_FUNC & ARM_GET_FLAG (s)) \ */ \
162 && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)))
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))
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))
176 void arm_copy_symbol_attributes (symbolS
*, symbolS
*);
178 #ifndef TC_COPY_SYMBOL_ATTRIBUTES
179 #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
180 (arm_copy_symbol_attributes (DEST, SRC))
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 ()
188 #define LISTING_HEADER "ARM GAS "
190 #define OPTIONAL_REGISTER_PREFIX '%'
192 #define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L')
193 #define LOCAL_LABELS_FB 1
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. */
202 #define TC_FORCE_RELOCATION_LOCAL(FIX) \
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))
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))
215 #define TC_FORCE_RELOCATION_ABS(FIX) \
217 && (FIX)->fx_r_type != BFD_RELOC_32 \
218 && (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32) \
219 || TC_FORCE_RELOCATION(FIX))
221 #define TC_CONS_FIX_NEW cons_fix_new_arm
223 #define MAX_MEM_ALIGNMENT_BYTES 6
224 #define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1)
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. */
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
237 symbolS
*first_map
, *last_map
;
242 arm_min (int am_p1
, int am_p2
)
244 return am_p1
< am_p2
? am_p1
: am_p2
;
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(). */
254 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
255 ((!(FRCHAIN)->frch_next && subseg_text_p (SEG)) \
256 ? arm_min (2, get_recorded_alignment (SEG)) : 0)
259 #define md_do_align(N, FILL, LEN, MAX, LABEL) \
260 if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \
262 arm_frag_align_code (N, MAX); \
266 #define DWARF2_LINE_MIN_INSN_LENGTH 2
268 /* The lr register is r14. */
269 #define DWARF2_DEFAULT_RETURN_COLUMN 14
271 /* Registers are generally saved at negative offsets to the CFA. */
272 #define DWARF2_CIE_DATA_ALIGNMENT (-4)
274 /* State variables for IT block handling. */
277 OUTSIDE_IT_BLOCK
, MANUAL_IT_BLOCK
, AUTOMATIC_IT_BLOCK
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
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
302 # define md_cons_align(nbytes) mapping_state (MAP_DATA)
306 MAP_UNDEFINED
= 0, /* Must be zero, for seginfo in new sections. */
312 void mapping_state (enum mstate
);
314 struct arm_segment_info_type
316 enum mstate mapstate
;
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
;
323 struct current_it current_it
;
326 /* We want .cfi_* pseudo-ops for generating unwind info. */
327 #define TARGET_USE_CFIPOP 1
330 #define tc_regname_to_dw2regnum tc_arm_regname_to_dw2regnum
331 #define tc_cfi_frame_initial_instructions tc_arm_frame_initial_instructions
333 #else /* Not OBJ_ELF. */
334 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
337 #if defined OBJ_ELF || defined OBJ_COFF
339 # define EXTERN_FORCE_RELOC 1
340 # define tc_fix_adjustable(FIX) arm_fix_adjustable (FIX)
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)
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
354 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
356 extern long md_pcrel_from_section (struct fix
*, segT
);
357 extern void arm_frag_align_code (int, int);
358 extern void arm_validate_fix (struct fix
*);
359 extern const char * elf32_arm_target_format (void);
360 extern void arm_elf_change_section (void);
361 extern int arm_force_relocation (struct fix
*);
362 extern void arm_cleanup (void);
363 extern void arm_start_line_hook (void);
364 extern void arm_frob_label (symbolS
*);
365 extern int arm_data_in_code (void);
366 extern char * arm_canonicalize_symbol_name (char *);
367 extern void arm_adjust_symtab (void);
368 extern void armelf_frob_symbol (symbolS
*, int *);
369 extern void cons_fix_new_arm (fragS
*, int, int, expressionS
*,
370 bfd_reloc_code_real_type
);
371 extern void arm_init_frag (struct frag
*, int);
372 extern void arm_handle_align (struct frag
*);
373 extern bfd_boolean
arm_fix_adjustable (struct fix
*);
374 extern int arm_elf_section_type (const char *, size_t);
375 extern int tc_arm_regname_to_dw2regnum (char *regname
);
376 extern void tc_arm_frame_initial_instructions (void);
380 #define O_secrel O_md1
382 #define TC_DWARF2_EMIT_OFFSET tc_pe_dwarf2_emit_offset
383 void tc_pe_dwarf2_emit_offset (symbolS
*, unsigned int);
388 #define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name)
389 extern int arm_convert_symbolic_attribute (const char *);
390 extern int arm_apply_sym_value (struct fix
*, segT
);
393 #define tc_comment_chars arm_comment_chars
394 extern char arm_comment_chars
[];
396 #define tc_line_separator_chars arm_line_separator_chars
397 extern char arm_line_separator_chars
[];
399 #define TC_EQUAL_IN_INSN(c, s) arm_tc_equal_in_insn ((c), (s))
400 extern bfd_boolean
arm_tc_equal_in_insn (int, char *);