source: arduino-1-6-7/trunk/fuentes/arduino-ide-amd64/hardware/tools/avr/lib/gcc/avr/4.9.2/plugin/include/config/elfos.h @ 4837

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1/* elfos.h  --  operating system specific defines to be used when
2   targeting GCC for some generic ELF system
3   Copyright (C) 1991-2014 Free Software Foundation, Inc.
4   Based on svr4.h contributed by Ron Guilmette (rfg@netcom.com).
5
6This file is part of GCC.
7
8GCC is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 3, or (at your option)
11any later version.
12
13GCC is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18Under Section 7 of GPL version 3, you are granted additional
19permissions described in the GCC Runtime Library Exception, version
203.1, as published by the Free Software Foundation.
21
22You should have received a copy of the GNU General Public License and
23a copy of the GCC Runtime Library Exception along with this program;
24see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
25<http://www.gnu.org/licenses/>.  */
26
27#define TARGET_OBJFMT_CPP_BUILTINS()            \
28  do                                            \
29    {                                           \
30        builtin_define ("__ELF__");             \
31    }                                           \
32  while (0)
33
34/* Define a symbol indicating that we are using elfos.h.
35   Some CPU specific configuration files use this.  */
36#define USING_ELFOS_H
37
38/* The prefix to add to user-visible assembler symbols.
39
40   For ELF systems the convention is *not* to prepend a leading
41   underscore onto user-level symbol names.  */
42
43#undef  USER_LABEL_PREFIX
44#define USER_LABEL_PREFIX ""
45
46/* The biggest alignment supported by ELF in bits. 32-bit ELF
47   supports section alignment up to (0x80000000 * 8), while
48   64-bit ELF supports (0x8000000000000000 * 8). If this macro
49   is not defined, the default is the largest alignment supported
50   by 32-bit ELF and representable on a 32-bit host. Use this
51   macro to limit the alignment which can be specified using
52   the `__attribute__ ((aligned (N)))' construct.  */
53#ifndef MAX_OFILE_ALIGNMENT
54#define MAX_OFILE_ALIGNMENT (((unsigned int) 1 << 28) * 8)
55#endif
56
57/* Use periods rather than dollar signs in special g++ assembler names.  */
58
59#define NO_DOLLAR_IN_LABEL
60
61/* Writing `int' for a bit-field forces int alignment for the structure.  */
62
63#ifndef PCC_BITFIELD_TYPE_MATTERS
64#define PCC_BITFIELD_TYPE_MATTERS 1
65#endif
66
67/* All ELF targets can support DWARF-2.  */
68
69#define DWARF2_DEBUGGING_INFO 1
70
71/* The GNU tools operate better with dwarf2, and it is required by some
72   psABI's.  Since we don't have any native tools to be compatible with,
73   default to dwarf2.  */
74
75#ifndef PREFERRED_DEBUGGING_TYPE
76#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
77#endif
78
79/* All SVR4 targets use the ELF object file format.  */
80#define OBJECT_FORMAT_ELF
81
82
83/* Output #ident as a .ident.  */
84
85#undef TARGET_ASM_OUTPUT_IDENT
86#define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive
87
88#undef  SET_ASM_OP
89#define SET_ASM_OP      "\t.set\t"
90
91/* Most svr4 assemblers want a .file directive at the beginning of
92   their input file.  */
93#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
94
95/* This is how to allocate empty space in some section.  The .zero
96   pseudo-op is used for this on most svr4 assemblers.  */
97
98#define SKIP_ASM_OP     "\t.zero\t"
99
100#undef  ASM_OUTPUT_SKIP
101#define ASM_OUTPUT_SKIP(FILE, SIZE) \
102   fprintf ((FILE), "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n",\
103            SKIP_ASM_OP, (SIZE))
104
105/* This is how to store into the string LABEL
106   the symbol_ref name of an internal numbered label where
107   PREFIX is the class of label and NUM is the number within the class.
108   This is suitable for output with `assemble_name'.
109
110   For most svr4 systems, the convention is that any symbol which begins
111   with a period is not put into the linker symbol table by the assembler.  */
112
113#undef  ASM_GENERATE_INTERNAL_LABEL
114#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM)         \
115  do                                                            \
116    {                                                           \
117      char *__p;                                                \
118      (LABEL)[0] = '*';                                         \
119      (LABEL)[1] = '.';                                         \
120      __p = stpcpy (&(LABEL)[2], PREFIX);                       \
121      sprint_ul (__p, (unsigned long) (NUM));                   \
122    }                                                           \
123  while (0)
124
125/* Output the label which precedes a jumptable.  Note that for all svr4
126   systems where we actually generate jumptables (which is to say every
127   svr4 target except i386, where we use casesi instead) we put the jump-
128   tables into the .rodata section and since other stuff could have been
129   put into the .rodata section prior to any given jumptable, we have to
130   make sure that the location counter for the .rodata section gets pro-
131   perly re-aligned prior to the actual beginning of the jump table.  */
132
133#undef ALIGN_ASM_OP
134#define ALIGN_ASM_OP "\t.align\t"
135
136#ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
137#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
138  ASM_OUTPUT_ALIGN ((FILE), 2);
139#endif
140
141#undef  ASM_OUTPUT_CASE_LABEL
142#define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE)             \
143  do                                                                    \
144    {                                                                   \
145      ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE)       \
146        (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM);                  \
147    }                                                                   \
148  while (0)
149
150/* The standard SVR4 assembler seems to require that certain builtin
151   library routines (e.g. .udiv) be explicitly declared as .globl
152   in each assembly file where they are referenced.  */
153
154#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)  \
155  (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0))
156
157/* This says how to output assembler code to declare an
158   uninitialized external linkage data object.  Under SVR4,
159   the linker seems to want the alignment of data objects
160   to depend on their types.  We do exactly that here.  */
161
162#define COMMON_ASM_OP   "\t.comm\t"
163
164#undef  ASM_OUTPUT_ALIGNED_COMMON
165#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
166  do                                                                    \
167    {                                                                   \
168      fprintf ((FILE), "%s", COMMON_ASM_OP);                            \
169      assemble_name ((FILE), (NAME));                                   \
170      fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",          \
171               (SIZE), (ALIGN) / BITS_PER_UNIT);                        \
172    }                                                                   \
173  while (0)
174
175/* This says how to output assembler code to declare an
176   uninitialized internal linkage data object.  Under SVR4,
177   the linker seems to want the alignment of data objects
178   to depend on their types.  We do exactly that here.  */
179
180#define LOCAL_ASM_OP    "\t.local\t"
181
182#undef  ASM_OUTPUT_ALIGNED_LOCAL
183#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)       \
184  do                                                            \
185    {                                                           \
186      fprintf ((FILE), "%s", LOCAL_ASM_OP);                     \
187      assemble_name ((FILE), (NAME));                           \
188      fprintf ((FILE), "\n");                                   \
189      ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN);      \
190    }                                                           \
191  while (0)
192
193/* This is the pseudo-op used to generate a contiguous sequence of byte
194   values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
195   AUTOMATICALLY APPENDED.  This is the same for most svr4 assemblers.  */
196
197#undef  ASCII_DATA_ASM_OP
198#define ASCII_DATA_ASM_OP       "\t.ascii\t"
199
200/* Support a read-only data section.  */
201#define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
202
203/* On svr4, we *do* have support for the .init and .fini sections, and we
204   can put stuff in there to be executed before and after `main'.  We let
205   crtstuff.c and other files know this by defining the following symbols.
206   The definitions say how to change sections to the .init and .fini
207   sections.  This is the same for all known svr4 assemblers.  */
208
209#define INIT_SECTION_ASM_OP     "\t.section\t.init"
210#define FINI_SECTION_ASM_OP     "\t.section\t.fini"
211
212/* Output assembly directive to move to the beginning of current section.  */
213#ifdef HAVE_GAS_SUBSECTION_ORDERING
214# define ASM_SECTION_START_OP   "\t.subsection\t-1"
215# define ASM_OUTPUT_SECTION_START(FILE) \
216  fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
217#endif
218
219#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
220
221/* Switch into a generic section.  */
222#define TARGET_ASM_NAMED_SECTION  default_elf_asm_named_section
223
224#undef  TARGET_ASM_SELECT_RTX_SECTION
225#define TARGET_ASM_SELECT_RTX_SECTION default_elf_select_rtx_section
226#undef  TARGET_ASM_SELECT_SECTION
227#define TARGET_ASM_SELECT_SECTION default_elf_select_section
228#undef  TARGET_HAVE_SWITCHABLE_BSS_SECTIONS
229#define TARGET_HAVE_SWITCHABLE_BSS_SECTIONS true
230
231/* Define the strings used for the special svr4 .type and .size directives.
232   These strings generally do not vary from one system running svr4 to
233   another, but if a given system (e.g. m88k running svr) needs to use
234   different pseudo-op names for these, they may be overridden in the
235   file which includes this one.  */
236
237#define TYPE_ASM_OP     "\t.type\t"
238#define SIZE_ASM_OP     "\t.size\t"
239
240/* This is how we tell the assembler that a symbol is weak.  */
241
242#define ASM_WEAKEN_LABEL(FILE, NAME)    \
243  do                                    \
244    {                                   \
245      fputs ("\t.weak\t", (FILE));      \
246      assemble_name ((FILE), (NAME));   \
247      fputc ('\n', (FILE));             \
248    }                                   \
249  while (0)
250
251/* The following macro defines the format used to output the second
252   operand of the .type assembler directive.  Different svr4 assemblers
253   expect various different forms for this operand.  The one given here
254   is just a default.  You may need to override it in your machine-
255   specific tm.h file (depending upon the particulars of your assembler).  */
256
257#define TYPE_OPERAND_FMT        "@%s"
258
259/* Write the extra assembler code needed to declare a function's result.
260   Most svr4 assemblers don't require any special declaration of the
261   result value, but there are exceptions.  */
262
263#ifndef ASM_DECLARE_RESULT
264#define ASM_DECLARE_RESULT(FILE, RESULT)
265#endif
266
267/* These macros generate the special .type and .size directives which
268   are used to set the corresponding fields of the linker symbol table
269   entries in an ELF object file under SVR4.  These macros also output
270   the starting labels for the relevant functions/objects.  */
271
272/* Write the extra assembler code needed to declare a function properly.
273   Some svr4 assemblers need to also have something extra said about the
274   function's return value.  We allow for that here.  */
275
276#ifndef ASM_DECLARE_FUNCTION_NAME
277#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
278  do                                                            \
279    {                                                           \
280      ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
281      ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
282      ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL);             \
283    }                                                           \
284  while (0)
285#endif
286
287/* Write the extra assembler code needed to declare an object properly.  */
288
289#ifdef HAVE_GAS_GNU_UNIQUE_OBJECT
290#define USE_GNU_UNIQUE_OBJECT flag_gnu_unique
291#else
292#define USE_GNU_UNIQUE_OBJECT 0
293#endif
294
295#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
296  do                                                                    \
297    {                                                                   \
298      HOST_WIDE_INT size;                                               \
299                                                                        \
300      /* For template static data member instantiations or              \
301         inline fn local statics and their guard variables, use         \
302         gnu_unique_object so that they will be combined even under     \
303         RTLD_LOCAL.  Don't use gnu_unique_object for typeinfo,         \
304         vtables and other read-only artificial decls.  */              \
305      if (USE_GNU_UNIQUE_OBJECT && DECL_ONE_ONLY (DECL)                 \
306          && (!DECL_ARTIFICIAL (DECL) || !TREE_READONLY (DECL)))        \
307        ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "gnu_unique_object");    \
308      else                                                              \
309        ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");               \
310                                                                        \
311      size_directive_output = 0;                                        \
312      if (!flag_inhibit_size_directive                                  \
313          && (DECL) && DECL_SIZE (DECL))                                \
314        {                                                               \
315          size_directive_output = 1;                                    \
316          size = int_size_in_bytes (TREE_TYPE (DECL));                  \
317          ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);                 \
318        }                                                               \
319                                                                        \
320      ASM_OUTPUT_LABEL (FILE, NAME);                                    \
321    }                                                                   \
322  while (0)
323
324/* Output the size directive for a decl in rest_of_decl_compilation
325   in the case where we did not do so before the initializer.
326   Once we find the error_mark_node, we know that the value of
327   size_directive_output was set
328   by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
329
330#undef ASM_FINISH_DECLARE_OBJECT
331#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)\
332  do                                                            \
333    {                                                           \
334      const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);   \
335      HOST_WIDE_INT size;                                       \
336                                                                \
337      if (!flag_inhibit_size_directive                          \
338          && DECL_SIZE (DECL)                                   \
339          && ! AT_END && TOP_LEVEL                              \
340          && DECL_INITIAL (DECL) == error_mark_node             \
341          && !size_directive_output)                            \
342        {                                                       \
343          size_directive_output = 1;                            \
344          size = int_size_in_bytes (TREE_TYPE (DECL));          \
345          ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size);         \
346        }                                                       \
347    }                                                           \
348  while (0)
349
350/* This is how to declare the size of a function.  */
351#ifndef ASM_DECLARE_FUNCTION_SIZE
352#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)            \
353  do                                                            \
354    {                                                           \
355      if (!flag_inhibit_size_directive)                         \
356        ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                 \
357    }                                                           \
358  while (0)
359#endif
360
361/* A table of bytes codes used by the ASM_OUTPUT_ASCII and
362   ASM_OUTPUT_LIMITED_STRING macros.  Each byte in the table
363   corresponds to a particular byte value [0..255].  For any
364   given byte value, if the value in the corresponding table
365   position is zero, the given character can be output directly.
366   If the table value is 1, the byte must be output as a \ooo
367   octal escape.  If the tables value is anything else, then the
368   byte value should be output as a \ followed by the value
369   in the table.  Note that we can use standard UN*X escape
370   sequences for many control characters, but we don't use
371   \a to represent BEL because some svr4 assemblers (e.g. on
372   the i386) don't know about that.  Also, we don't use \v
373   since some versions of gas, such as 2.2 did not accept it.  */
374
375#define ELF_ASCII_ESCAPES \
376"\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
377\0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
378\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\
379\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
380\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
381\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
382\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
383\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
384
385/* Some svr4 assemblers have a limit on the number of characters which
386   can appear in the operand of a .string directive.  If your assembler
387   has such a limitation, you should define STRING_LIMIT to reflect that
388   limit.  Note that at least some svr4 assemblers have a limit on the
389   actual number of bytes in the double-quoted string, and that they
390   count each character in an escape sequence as one byte.  Thus, an
391   escape sequence like \377 would count as four bytes.
392
393   If your target assembler doesn't support the .string directive, you
394   should define this to zero.
395*/
396
397#define ELF_STRING_LIMIT        ((unsigned) 256)
398
399#define STRING_ASM_OP   "\t.string\t"
400
401/* The routine used to output NUL terminated strings.  We use a special
402   version of this for most svr4 targets because doing so makes the
403   generated assembly code more compact (and thus faster to assemble)
404   as well as more readable, especially for targets like the i386
405   (where the only alternative is to output character sequences as
406   comma separated lists of numbers).  */
407
408#define ASM_OUTPUT_LIMITED_STRING(FILE, STR)            \
409  default_elf_asm_output_limited_string ((FILE), (STR))
410
411/* The routine used to output sequences of byte values.  We use a special
412   version of this for most svr4 targets because doing so makes the
413   generated assembly code more compact (and thus faster to assemble)
414   as well as more readable.  Note that if we find subparts of the
415   character sequence which end with NUL (and which are shorter than
416   STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
417
418#undef  ASM_OUTPUT_ASCII
419#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                     \
420  default_elf_asm_output_ascii ((FILE), (STR), (LENGTH));
421
422/* Allow the use of the -frecord-gcc-switches switch via the
423   elf_record_gcc_switches function defined in varasm.c.  */
424#undef  TARGET_ASM_RECORD_GCC_SWITCHES
425#define TARGET_ASM_RECORD_GCC_SWITCHES elf_record_gcc_switches
426
427/* A C statement (sans semicolon) to output to the stdio stream STREAM
428   any text necessary for declaring the name of an external symbol
429   named NAME which is referenced in this compilation but not defined.
430   It is needed to properly support non-default visibility.  */
431
432#ifndef ASM_OUTPUT_EXTERNAL
433#define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
434  default_elf_asm_output_external (FILE, DECL, NAME)
435#endif
436
437#undef TARGET_LIBC_HAS_FUNCTION
438#define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
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