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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [gas/] [config/] [tc-arm.h] - Blame information for rev 94

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/* This file is tc-arm.h
2
   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3
   2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation, Inc.
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
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
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   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
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   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
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#   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
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# else
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#  define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little")
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# endif
77
#elif defined OBJ_ELF
78
# define ARM_BI_ENDIAN
79
# define TARGET_FORMAT  elf32_arm_target_format ()
80
#endif
81
 
82
#define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX)
83
 
84
#define md_relax_frag(segment, fragp, stretch) \
85
  arm_relax_frag (segment, fragp, stretch)
86
extern int arm_relax_frag (asection *, struct frag *, long);
87
 
88
#define md_optimize_expr(l,o,r)         arm_optimize_expr (l, o, r)
89
extern int arm_optimize_expr (expressionS *, operatorT, expressionS *);
90
 
91
#define md_cleanup() arm_cleanup ()
92
 
93
#define md_start_line_hook() arm_start_line_hook ()
94
 
95
#define tc_frob_label(S) arm_frob_label (S)
96
 
97
/* We also need to mark assembler created symbols:  */
98
#define tc_frob_fake_label(S) arm_frob_label (S)
99
 
100
#ifdef OBJ_ELF
101
#define md_end arm_md_end
102
extern void arm_md_end (void);
103
bfd_boolean arm_is_eabi (void);
104
#endif
105
 
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
 
110
#define TC_FIX_TYPE int
111
#define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0)
112
 
113
/* We need to keep some local information on symbols.  */
114
 
115
#define TC_SYMFIELD_TYPE        unsigned int
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))
119
 
120
#define ARM_FLAG_THUMB          (1 << 0)        /* The symbol is a Thumb symbol rather than an Arm symbol.  */
121
#define ARM_FLAG_INTERWORK      (1 << 1)        /* The symbol is attached to code that supports interworking.  */
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)
126
 
127
#ifdef OBJ_ELF
128
 
129
/* For ELF objects THUMB_IS_FUNC is inferred from
130
   ARM_IS_THUMB and the function type.  */
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)) \ */    \
143
    && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)))
144
 
145
 
146
#else
147
 
148
#define THUMB_IS_FUNC(s)        ((s) && ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)
149
#define ARM_IS_FUNC(s)          (!THUMB_IS_FUNC (s) \
150
                                 && (s) && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))
151
#endif
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
 
157
void arm_copy_symbol_attributes (symbolS *, symbolS *);
158
 
159
#ifndef TC_COPY_SYMBOL_ATTRIBUTES
160
#define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
161
  (arm_copy_symbol_attributes (DEST, SRC))
162
#endif
163
 
164
#define TC_START_LABEL(C,S,STR)            (C == ':' || (C == '/' && arm_data_in_code ()))
165
#define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str);
166
#define obj_adjust_symtab()              arm_adjust_symtab ()
167
 
168
#define LISTING_HEADER "ARM GAS "
169
 
170
#define OPTIONAL_REGISTER_PREFIX '%'
171
 
172
#define LOCAL_LABEL(name)  (name[0] == '.' && name[1] == 'L')
173
#define LOCAL_LABELS_FB    1
174
 
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
180
   pcrel, but it is easier to be safe than sorry.  */
181
 
182
#define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
183
  (!(FIX)->fx_pcrel                                     \
184
   || (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32           \
185
   || (FIX)->fx_r_type == BFD_RELOC_32                  \
186
   || ((FIX)->fx_addsy != NULL && S_IS_WEAK ((FIX)->fx_addsy))  \
187
   || TC_FORCE_RELOCATION (FIX))
188
 
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
 
195
#define TC_FORCE_RELOCATION_ABS(FIX)                    \
196
  (((FIX)->fx_pcrel                                     \
197
    && (FIX)->fx_r_type != BFD_RELOC_32                 \
198
    && (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32)         \
199
   || TC_FORCE_RELOCATION(FIX))
200
 
201
#define TC_CONS_FIX_NEW cons_fix_new_arm
202
 
203
#define MAX_MEM_ALIGNMENT_BYTES    6
204
#define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1)
205
 
206
/* For frags in code sections we need to record whether they contain
207
   ARM code or THUMB code.  This is that if they have to be aligned,
208
   they can contain the correct type of no-op instruction.  */
209
struct arm_frag_type
210
{
211
  int thumb_mode;
212
#ifdef OBJ_ELF
213
  /* If there is a mapping symbol at offset 0 in this frag,
214
     it will be saved in FIRST_MAP.  If there are any mapping
215
     symbols in this frag, the last one will be saved in
216
     LAST_MAP.  */
217
  symbolS *first_map, *last_map;
218
#endif
219
};
220
 
221
#define TC_FRAG_TYPE            struct arm_frag_type
222
/* NOTE: max_chars is a local variable from frag_var / frag_variant.  */
223
#define TC_FRAG_INIT(fragp)     arm_init_frag (fragp, max_chars)
224
#define HANDLE_ALIGN(fragp)     arm_handle_align (fragp)
225
 
226
#define md_do_align(N, FILL, LEN, MAX, LABEL)                                   \
227
  if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg))      \
228
    {                                                                           \
229
      arm_frag_align_code (N, MAX);                                             \
230
      goto LABEL;                                                               \
231
    }
232
 
233
#define DWARF2_LINE_MIN_INSN_LENGTH     2
234
 
235
/* The lr register is r14.  */
236
#define DWARF2_DEFAULT_RETURN_COLUMN  14
237
 
238
/* Registers are generally saved at negative offsets to the CFA.  */
239
#define DWARF2_CIE_DATA_ALIGNMENT     (-4)
240
 
241
/* State variables for IT block handling.  */
242
enum it_state
243
{
244
  OUTSIDE_IT_BLOCK, MANUAL_IT_BLOCK, AUTOMATIC_IT_BLOCK
245
};
246
struct current_it
247
{
248
  int mask;
249
  enum it_state state;
250
  int cc;
251
  int block_length;
252
  char *insn;
253
  int state_handled;
254
};
255
 
256
#ifdef OBJ_ELF
257
# define obj_frob_symbol(sym, punt)     armelf_frob_symbol ((sym), & (punt))
258
# define md_elf_section_change_hook()   arm_elf_change_section ()
259
# define md_elf_section_type(str, len)  arm_elf_section_type (str, len)
260
# define GLOBAL_OFFSET_TABLE_NAME       "_GLOBAL_OFFSET_TABLE_"
261
# define TC_SEGMENT_INFO_TYPE           struct arm_segment_info_type
262
 
263
/* This is not really an alignment operation, but it's something we
264
   need to do at the same time: whenever we are figuring out the
265
   alignment for data, we should check whether a $d symbol is
266
   necessary.  */
267
# define md_cons_align(nbytes)          mapping_state (MAP_DATA)
268
 
269
enum mstate
270
{
271
  MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections.  */
272
  MAP_DATA,
273
  MAP_ARM,
274
  MAP_THUMB
275
};
276
 
277
void mapping_state (enum mstate);
278
 
279
struct arm_segment_info_type
280
{
281
  enum mstate mapstate;
282
 
283
  /* Bit N indicates that an R_ARM_NONE relocation has been output for
284
     __aeabi_unwind_cpp_prN already if set. This enables dependencies to be
285
     emitted only once per section, to save unnecessary bloat.  */
286
  unsigned int marked_pr_dependency;
287
 
288
  struct current_it current_it;
289
};
290
 
291
/* We want .cfi_* pseudo-ops for generating unwind info.  */
292
#define TARGET_USE_CFIPOP              1
293
 
294
/* CFI hooks.  */
295
#define tc_regname_to_dw2regnum            tc_arm_regname_to_dw2regnum
296
#define tc_cfi_frame_initial_instructions  tc_arm_frame_initial_instructions
297
 
298
#else /* Not OBJ_ELF.  */
299
#define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
300
#endif
301
 
302
#if defined OBJ_ELF || defined OBJ_COFF
303
 
304
# define EXTERN_FORCE_RELOC                     1
305
# define tc_fix_adjustable(FIX)                 arm_fix_adjustable (FIX)
306
#endif
307
 
308
#ifdef OBJ_ELF
309
/* Values passed to md_apply_fix don't include the symbol value.  */
310
# define MD_APPLY_SYM_VALUE(FIX)                arm_apply_sym_value (FIX)
311
#endif
312
 
313
#ifdef OBJ_COFF
314
# define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL)   arm_validate_fix (FIX)
315
/* Values passed to md_apply_fix don't include the symbol value.  */
316
# define MD_APPLY_SYM_VALUE(FIX)                0
317
#endif
318
 
319
#define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
320
 
321
extern long md_pcrel_from_section (struct fix *, segT);
322
extern void arm_frag_align_code (int, int);
323
extern void arm_validate_fix (struct fix *);
324
extern const char * elf32_arm_target_format (void);
325
extern void arm_elf_change_section (void);
326
extern int arm_force_relocation (struct fix *);
327
extern void arm_cleanup (void);
328
extern void arm_start_line_hook (void);
329
extern void arm_frob_label (symbolS *);
330
extern int arm_data_in_code (void);
331
extern char * arm_canonicalize_symbol_name (char *);
332
extern void arm_adjust_symtab (void);
333
extern void armelf_frob_symbol (symbolS *, int *);
334
extern void cons_fix_new_arm (fragS *, int, int, expressionS *);
335
extern void arm_init_frag (struct frag *, int);
336
extern void arm_handle_align (struct frag *);
337
extern bfd_boolean arm_fix_adjustable (struct fix *);
338
extern int arm_elf_section_type (const char *, size_t);
339
extern int tc_arm_regname_to_dw2regnum (char *regname);
340
extern void tc_arm_frame_initial_instructions (void);
341
 
342
#ifdef TE_PE
343
 
344
#define O_secrel O_md1
345
 
346
#define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
347
void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
348
 
349
#endif /* TE_PE */
350
 
351
#ifdef OBJ_ELF
352
#define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name)
353
extern int arm_convert_symbolic_attribute (const char *);
354
extern int arm_apply_sym_value (struct fix *);
355
#endif

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