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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [gas/] [config/] [tc-arm.h] - Blame information for rev 166

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1 16 khays
/* This file is tc-arm.h
2
   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 166 khays
   2004, 2005, 2006, 2007, 2008, 2009, 2012  Free Software Foundation, Inc.
4 16 khays
   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
11
   the Free Software Foundation; either version 3, or (at your option)
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
21
   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
22
   02110-1301, USA.  */
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
 
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
 
48
struct fix;
49
 
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
65
# define ARM_BI_ENDIAN
66
# if defined TE_PE
67
#  if defined TE_EPOC
68
#   define TARGET_FORMAT (target_big_endian ? "epoc-pe-arm-big" : "epoc-pe-arm-little")
69
#  elif defined TE_WINCE
70
#   define TARGET_FORMAT (target_big_endian ? "pe-arm-wince-big" : "pe-arm-wince-little")
71
#  else
72
#   define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little")
73
#  endif
74
# else
75
#  define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little")
76
# endif
77
#elif defined OBJ_ELF
78
# define ARM_BI_ENDIAN
79
# define TARGET_FORMAT  elf32_arm_target_format ()
80
#endif
81
 
82 166 khays
/* We support double slash line-comments for compatibility with the ARM AArch64 Assembler.  */
83
#define DOUBLESLASH_LINE_COMMENTS
84
 
85 16 khays
#define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX)
86
 
87
#define md_relax_frag(segment, fragp, stretch) \
88
  arm_relax_frag (segment, fragp, stretch)
89
extern int arm_relax_frag (asection *, struct frag *, long);
90
 
91
#define md_optimize_expr(l,o,r)         arm_optimize_expr (l, o, r)
92
extern int arm_optimize_expr (expressionS *, operatorT, expressionS *);
93
 
94
#define md_cleanup() arm_cleanup ()
95
 
96
#define md_start_line_hook() arm_start_line_hook ()
97
 
98
#define tc_frob_label(S) arm_frob_label (S)
99
 
100
/* We also need to mark assembler created symbols:  */
101
#define tc_frob_fake_label(S) arm_frob_label (S)
102
 
103
#ifdef OBJ_ELF
104
#define md_end arm_md_end
105
extern void arm_md_end (void);
106
bfd_boolean arm_is_eabi (void);
107
#endif
108
 
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
 
113
#define TC_FIX_TYPE int
114
#define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0)
115
 
116
/* We need to keep some local information on symbols.  */
117
 
118
#define TC_SYMFIELD_TYPE        unsigned int
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))
122
 
123
#define ARM_FLAG_THUMB          (1 << 0)        /* The symbol is a Thumb symbol rather than an Arm symbol.  */
124
#define ARM_FLAG_INTERWORK      (1 << 1)        /* The symbol is attached to code that supports interworking.  */
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)
129
 
130
#ifdef OBJ_ELF
131
 
132
/* For ELF objects THUMB_IS_FUNC is inferred from
133
   ARM_IS_THUMB and the function type.  */
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)) \ */    \
146
    && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)))
147
 
148
 
149
#else
150
 
151
#define THUMB_IS_FUNC(s)        ((s) && ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)
152
#define ARM_IS_FUNC(s)          (!THUMB_IS_FUNC (s) \
153
                                 && (s) && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))
154
#endif
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
 
160
void arm_copy_symbol_attributes (symbolS *, symbolS *);
161
 
162
#ifndef TC_COPY_SYMBOL_ATTRIBUTES
163
#define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
164
  (arm_copy_symbol_attributes (DEST, SRC))
165
#endif
166
 
167
#define TC_START_LABEL(C,S,STR)            (C == ':' || (C == '/' && arm_data_in_code ()))
168
#define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str);
169
#define obj_adjust_symtab()              arm_adjust_symtab ()
170
 
171
#define LISTING_HEADER "ARM GAS "
172
 
173
#define OPTIONAL_REGISTER_PREFIX '%'
174
 
175
#define LOCAL_LABEL(name)  (name[0] == '.' && name[1] == 'L')
176
#define LOCAL_LABELS_FB    1
177
 
178
/* This expression evaluates to true if the relocation is for a local
179
   object for which we still want to do the relocation at runtime.
180
   False if we are willing to perform this relocation while building
181
   the .o file.  GOTOFF does not need to be checked here because it is
182
   not pcrel.  I am not sure if some of the others are ever used with
183
   pcrel, but it is easier to be safe than sorry.  */
184
 
185
#define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
186
  (!(FIX)->fx_pcrel                                     \
187
   || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32           \
188
   || (FIX)->fx_r_type == BFD_RELOC_32                  \
189
   || ((FIX)->fx_addsy != NULL && S_IS_WEAK ((FIX)->fx_addsy))  \
190
   || TC_FORCE_RELOCATION (FIX))
191
 
192
/* Force output of R_ARM_REL32 relocations against thumb function symbols.
193
   This is needed to ensure the low bit is handled correctly.  */
194
#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG)  \
195
  (THUMB_IS_FUNC ((FIX)->fx_addsy)              \
196
   || !SEG_NORMAL (SEG))
197
 
198
#define TC_FORCE_RELOCATION_ABS(FIX)                    \
199
  (((FIX)->fx_pcrel                                     \
200
    && (FIX)->fx_r_type != BFD_RELOC_32                 \
201
    && (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32)         \
202
   || TC_FORCE_RELOCATION(FIX))
203
 
204
#define TC_CONS_FIX_NEW cons_fix_new_arm
205
 
206
#define MAX_MEM_ALIGNMENT_BYTES    6
207
#define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1)
208
 
209
/* For frags in code sections we need to record whether they contain
210
   ARM code or THUMB code.  This is that if they have to be aligned,
211
   they can contain the correct type of no-op instruction.  */
212
struct arm_frag_type
213
{
214
  int thumb_mode;
215
#ifdef OBJ_ELF
216
  /* If there is a mapping symbol at offset 0 in this frag,
217
     it will be saved in FIRST_MAP.  If there are any mapping
218
     symbols in this frag, the last one will be saved in
219
     LAST_MAP.  */
220
  symbolS *first_map, *last_map;
221
#endif
222
};
223
 
224
#define TC_FRAG_TYPE            struct arm_frag_type
225
/* NOTE: max_chars is a local variable from frag_var / frag_variant.  */
226
#define TC_FRAG_INIT(fragp)     arm_init_frag (fragp, max_chars)
227
#define HANDLE_ALIGN(fragp)     arm_handle_align (fragp)
228
 
229
#define md_do_align(N, FILL, LEN, MAX, LABEL)                                   \
230
  if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg))      \
231
    {                                                                           \
232
      arm_frag_align_code (N, MAX);                                             \
233
      goto LABEL;                                                               \
234
    }
235
 
236
#define DWARF2_LINE_MIN_INSN_LENGTH     2
237
 
238
/* The lr register is r14.  */
239
#define DWARF2_DEFAULT_RETURN_COLUMN  14
240
 
241
/* Registers are generally saved at negative offsets to the CFA.  */
242
#define DWARF2_CIE_DATA_ALIGNMENT     (-4)
243
 
244
/* State variables for IT block handling.  */
245
enum it_state
246
{
247
  OUTSIDE_IT_BLOCK, MANUAL_IT_BLOCK, AUTOMATIC_IT_BLOCK
248
};
249
struct current_it
250
{
251
  int mask;
252
  enum it_state state;
253
  int cc;
254
  int block_length;
255
  char *insn;
256
  int state_handled;
257
};
258
 
259
#ifdef OBJ_ELF
260
# define obj_frob_symbol(sym, punt)     armelf_frob_symbol ((sym), & (punt))
261
# define md_elf_section_change_hook()   arm_elf_change_section ()
262
# define md_elf_section_type(str, len)  arm_elf_section_type (str, len)
263
# define GLOBAL_OFFSET_TABLE_NAME       "_GLOBAL_OFFSET_TABLE_"
264
# define TC_SEGMENT_INFO_TYPE           struct arm_segment_info_type
265
 
266
/* This is not really an alignment operation, but it's something we
267
   need to do at the same time: whenever we are figuring out the
268
   alignment for data, we should check whether a $d symbol is
269
   necessary.  */
270
# define md_cons_align(nbytes)          mapping_state (MAP_DATA)
271
 
272
enum mstate
273
{
274
  MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections.  */
275
  MAP_DATA,
276
  MAP_ARM,
277
  MAP_THUMB
278
};
279
 
280
void mapping_state (enum mstate);
281
 
282
struct arm_segment_info_type
283
{
284
  enum mstate mapstate;
285
 
286
  /* Bit N indicates that an R_ARM_NONE relocation has been output for
287
     __aeabi_unwind_cpp_prN already if set. This enables dependencies to be
288
     emitted only once per section, to save unnecessary bloat.  */
289
  unsigned int marked_pr_dependency;
290
 
291
  struct current_it current_it;
292
};
293
 
294
/* We want .cfi_* pseudo-ops for generating unwind info.  */
295
#define TARGET_USE_CFIPOP              1
296
 
297
/* CFI hooks.  */
298
#define tc_regname_to_dw2regnum            tc_arm_regname_to_dw2regnum
299
#define tc_cfi_frame_initial_instructions  tc_arm_frame_initial_instructions
300
 
301
#else /* Not OBJ_ELF.  */
302
#define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
303
#endif
304
 
305
#if defined OBJ_ELF || defined OBJ_COFF
306
 
307
# define EXTERN_FORCE_RELOC                     1
308
# define tc_fix_adjustable(FIX)                 arm_fix_adjustable (FIX)
309
#endif
310
 
311
#ifdef OBJ_ELF
312
/* Values passed to md_apply_fix don't include the symbol value.  */
313
# define MD_APPLY_SYM_VALUE(FIX)                arm_apply_sym_value (FIX)
314
#endif
315
 
316
#ifdef OBJ_COFF
317
# define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL)   arm_validate_fix (FIX)
318
/* Values passed to md_apply_fix don't include the symbol value.  */
319
# define MD_APPLY_SYM_VALUE(FIX)                0
320
#endif
321
 
322
#define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
323
 
324
extern long md_pcrel_from_section (struct fix *, segT);
325
extern void arm_frag_align_code (int, int);
326
extern void arm_validate_fix (struct fix *);
327
extern const char * elf32_arm_target_format (void);
328
extern void arm_elf_change_section (void);
329
extern int arm_force_relocation (struct fix *);
330
extern void arm_cleanup (void);
331
extern void arm_start_line_hook (void);
332
extern void arm_frob_label (symbolS *);
333
extern int arm_data_in_code (void);
334
extern char * arm_canonicalize_symbol_name (char *);
335
extern void arm_adjust_symtab (void);
336
extern void armelf_frob_symbol (symbolS *, int *);
337
extern void cons_fix_new_arm (fragS *, int, int, expressionS *);
338
extern void arm_init_frag (struct frag *, int);
339
extern void arm_handle_align (struct frag *);
340
extern bfd_boolean arm_fix_adjustable (struct fix *);
341
extern int arm_elf_section_type (const char *, size_t);
342
extern int tc_arm_regname_to_dw2regnum (char *regname);
343
extern void tc_arm_frame_initial_instructions (void);
344
 
345
#ifdef TE_PE
346
 
347
#define O_secrel O_md1
348
 
349
#define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
350
void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
351
 
352
#endif /* TE_PE */
353
 
354
#ifdef OBJ_ELF
355
#define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name)
356
extern int arm_convert_symbolic_attribute (const char *);
357
extern int arm_apply_sym_value (struct fix *);
358
#endif

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