linux64.h revision 117395 
1/* Definitions of target machine for GNU compiler,
2   for 64 bit PowerPC linux.
3   Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING.  If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA.  */
21
22/* Yes!  We are AIX! Err. Wait. We're Linux!. No, wait, we're a
23  combo of both!*/
24#undef  DEFAULT_ABI
25#define DEFAULT_ABI ABI_AIX
26
27#undef TARGET_AIX
28#define TARGET_AIX 1
29
30#undef TARGET_DEFAULT
31#define TARGET_DEFAULT \
32  (MASK_POWERPC | MASK_POWERPC64 | MASK_64BIT | MASK_NEW_MNEMONICS)
33
34#undef PROCESSOR_DEFAULT
35#define PROCESSOR_DEFAULT PROCESSOR_PPC630
36#undef PROCESSOR_DEFAULT64
37#define PROCESSOR_DEFAULT64 PROCESSOR_PPC630
38
39#undef  ASM_DEFAULT_SPEC
40#define ASM_DEFAULT_SPEC "-mppc64"
41
42#undef	ASM_SPEC
43#define	ASM_SPEC "%{.s: %{mregnames} %{mno-regnames}} \
44%{.S: %{mregnames} %{mno-regnames}} \
45%{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian} \
46%{v:-V} %{Qy:} %{!Qn:-Qy} -a64 %(asm_cpu) %{Wa,*:%*}"
47
48/* 64-bit PowerPC Linux always has a TOC.  */
49#undef  TARGET_NO_TOC
50#define TARGET_NO_TOC		0
51#undef  TARGET_TOC
52#define	TARGET_TOC		1
53
54/* We use glibc _mcount for profiling.  */
55#define NO_PROFILE_COUNTERS 1
56#undef  PROFILE_BEFORE_PROLOGUE
57
58/* Define this for kernel profiling, which just saves LR then calls
59   _mcount without worrying about arg saves.  The idea is to change
60   the function prologue as little as possible as it isn't easy to
61   account for arg save/restore code added just for _mcount.  */
62/* #define PROFILE_KERNEL 1 */
63#if PROFILE_KERNEL
64#define PROFILE_BEFORE_PROLOGUE 1
65#undef  PROFILE_HOOK
66#else
67#define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
68#endif
69
70/* We don't need to generate entries in .fixup.  */
71#undef RELOCATABLE_NEEDS_FIXUP
72
73#define USER_LABEL_PREFIX  ""
74
75/* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
76#undef  ADJUST_FIELD_ALIGN
77#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
78  (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
79	      ? get_inner_array_type (FIELD) \
80	      : TREE_TYPE (FIELD)) == DFmode \
81   ? MIN ((COMPUTED), 32) : (COMPUTED))
82
83/* AIX increases natural record alignment to doubleword if the first
84   field is an FP double while the FP fields remain word aligned.  */
85#undef ROUND_TYPE_ALIGN
86#define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)	\
87  ((TREE_CODE (STRUCT) == RECORD_TYPE			\
88    || TREE_CODE (STRUCT) == UNION_TYPE			\
89    || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)		\
90   && TYPE_FIELDS (STRUCT) != 0				\
91   && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode	\
92   ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64)		\
93   : MAX ((COMPUTED), (SPECIFIED)))
94
95/* Indicate that jump tables go in the text section.  */
96#undef  JUMP_TABLES_IN_TEXT_SECTION
97#define JUMP_TABLES_IN_TEXT_SECTION 1
98
99/* 64-bit PowerPC Linux always has GPR13 fixed.  */
100#define FIXED_R13		1
101
102/* __throw will restore its own return address to be the same as the
103   return address of the function that the throw is being made to.
104   This is unfortunate, because we want to check the original
105   return address to see if we need to restore the TOC.
106   So we have to squirrel it away with this.  */
107#define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init ()
108
109/* Override svr4.h  */
110#undef MD_EXEC_PREFIX
111#undef MD_STARTFILE_PREFIX
112
113#undef TARGET_OS_CPP_BUILTINS
114#define TARGET_OS_CPP_BUILTINS()            \
115  do                                        \
116    {                                       \
117      builtin_define ("__PPC__");           \
118      builtin_define ("__PPC64__");         \
119      builtin_define ("__powerpc__");       \
120      builtin_define ("__powerpc64__");     \
121      builtin_define ("__PIC__");           \
122      builtin_define ("__ELF__");           \
123      builtin_assert ("cpu=powerpc64");     \
124      builtin_assert ("machine=powerpc64"); \
125    }                                       \
126  while (0)
127
128#undef  CPP_OS_DEFAULT_SPEC
129#define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
130
131/* The GNU C++ standard library currently requires _GNU_SOURCE being
132   defined on glibc-based systems. This temporary hack accomplishes this,
133   it should go away as soon as libstdc++-v3 has a real fix.  */
134#undef  CPLUSPLUS_CPP_SPEC
135#define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
136
137#undef  LINK_SHLIB_SPEC
138#define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
139
140#undef  LIB_DEFAULT_SPEC
141#define LIB_DEFAULT_SPEC "%(lib_linux)"
142
143#undef  STARTFILE_DEFAULT_SPEC
144#define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
145
146#undef	ENDFILE_DEFAULT_SPEC
147#define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
148
149#undef	LINK_START_DEFAULT_SPEC
150#define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
151
152#undef	LINK_OS_DEFAULT_SPEC
153#define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
154
155#undef  LINK_OS_LINUX_SPEC
156#define LINK_OS_LINUX_SPEC "-m elf64ppc %{!shared: %{!static: \
157  %{rdynamic:-export-dynamic} \
158  %{!dynamic-linker:-dynamic-linker /lib64/ld64.so.1}}}"
159
160#ifdef NATIVE_CROSS
161#define STARTFILE_PREFIX_SPEC "/usr/local/lib64/ /lib64/ /usr/lib64/"
162#endif
163
164#undef  STARTFILE_LINUX_SPEC
165#define STARTFILE_LINUX_SPEC "\
166%{!shared: %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} %{!p:crt1.o%s}}} crti.o%s \
167%{static:crtbeginT.o%s} \
168%{!static:%{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}}"
169
170#undef  ENDFILE_LINUX_SPEC
171#define ENDFILE_LINUX_SPEC "\
172%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
173
174#undef  TOC_SECTION_ASM_OP
175#define TOC_SECTION_ASM_OP "\t.section\t\".toc\",\"aw\""
176
177#undef  MINIMAL_TOC_SECTION_ASM_OP
178#define MINIMAL_TOC_SECTION_ASM_OP "\t.section\t\".toc1\",\"aw\""
179
180#undef  TARGET_VERSION
181#define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
182
183/* Must be at least as big as our pointer type.  */
184#undef  SIZE_TYPE
185#define SIZE_TYPE "long unsigned int"
186
187#undef  PTRDIFF_TYPE
188#define PTRDIFF_TYPE "long int"
189
190#undef  WCHAR_TYPE
191#define WCHAR_TYPE "int"
192#undef  WCHAR_TYPE_SIZE
193#define WCHAR_TYPE_SIZE 32
194
195/* Override rs6000.h definition.  */
196#undef  ASM_APP_ON
197#define ASM_APP_ON "#APP\n"
198
199/* Override rs6000.h definition.  */
200#undef  ASM_APP_OFF
201#define ASM_APP_OFF "#NO_APP\n"
202
203/* PowerPC no-op instruction.  */
204#undef  RS6000_CALL_GLUE
205#define RS6000_CALL_GLUE "nop"
206
207#undef  RS6000_MCOUNT
208#define RS6000_MCOUNT "_mcount"
209
210#ifdef __powerpc64__
211/* _init and _fini functions are built from bits spread across many
212   object files, each potentially with a different TOC pointer.  For
213   that reason, place a nop after the call so that the linker can
214   restore the TOC pointer if a TOC adjusting call stub is needed.  */
215#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)	\
216  asm (SECTION_OP "\n"					\
217"	bl ." #FUNC "\n"				\
218"	nop\n"						\
219"	.previous");
220#endif
221
222/* FP save and restore routines.  */
223#undef  SAVE_FP_PREFIX
224#define SAVE_FP_PREFIX "._savef"
225#undef  SAVE_FP_SUFFIX
226#define SAVE_FP_SUFFIX ""
227#undef  RESTORE_FP_PREFIX
228#define RESTORE_FP_PREFIX "._restf"
229#undef  RESTORE_FP_SUFFIX
230#define RESTORE_FP_SUFFIX ""
231
232/* Dwarf2 debugging.  */
233#undef  PREFERRED_DEBUGGING_TYPE
234#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
235
236#undef  TARGET_ENCODE_SECTION_INFO
237#define TARGET_ENCODE_SECTION_INFO  rs6000_xcoff_encode_section_info
238
239/* This is how to output a reference to a user-level label named NAME.
240   `assemble_name' uses this.  */
241
242/* Override elfos.h definition.  */
243#undef  ASM_OUTPUT_LABELREF
244#define ASM_OUTPUT_LABELREF(FILE,NAME)		\
245do {						\
246  const char *_name = NAME;			\
247  if (*_name == '@')				\
248    _name++;					\
249 						\
250  if (*_name == '*')				\
251    fprintf (FILE, "%s", _name + 1);		\
252  else						\
253    asm_fprintf (FILE, "%U%s", _name);		\
254} while (0)
255
256#undef  ASM_DECLARE_FUNCTION_NAME
257#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)			\
258  do									\
259    {									\
260      fputs ("\t.section\t\".opd\",\"aw\"\n\t.align 3\n", (FILE));	\
261      ASM_OUTPUT_LABEL ((FILE), (NAME));				\
262      fputs (DOUBLE_INT_ASM_OP, (FILE));				\
263      putc ('.', (FILE));						\
264      assemble_name ((FILE), (NAME));					\
265      fputs (",.TOC.@tocbase,0\n\t.previous\n\t.size\t", (FILE));	\
266      assemble_name ((FILE), (NAME));					\
267      fputs (",24\n\t.type\t.", (FILE));				\
268      assemble_name ((FILE), (NAME));					\
269      fputs (",@function\n", (FILE));					\
270      if (TREE_PUBLIC (DECL) && ! DECL_WEAK (DECL))			\
271        {								\
272	  fputs ("\t.globl\t.", (FILE));				\
273	  assemble_name ((FILE), (NAME));				\
274	  putc ('\n', (FILE));						\
275        }								\
276      ASM_DECLARE_RESULT ((FILE), DECL_RESULT (DECL));			\
277      putc ('.', (FILE));						\
278      ASM_OUTPUT_LABEL ((FILE), (NAME));				\
279    }									\
280  while (0)
281
282/* This is how to declare the size of a function.  */
283#undef	ASM_DECLARE_FUNCTION_SIZE
284#define	ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)			\
285  do									\
286    {									\
287      if (!flag_inhibit_size_directive)					\
288	{								\
289	  fputs ("\t.size\t.", (FILE));					\
290	  assemble_name ((FILE), (FNAME));				\
291	  fputs (",.-.", (FILE));					\
292	  assemble_name ((FILE), (FNAME));				\
293	  putc ('\n', (FILE));						\
294	}								\
295    }									\
296  while (0)
297
298/* Return nonzero if this entry is to be written into the constant
299   pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
300   or a CONST containing one of them.  If -mfp-in-toc (the default),
301   we also do this for floating-point constants.  We actually can only
302   do this if the FP formats of the target and host machines are the
303   same, but we can't check that since not every file that uses
304   GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
305   we can write the entry into the TOC and the entry is not larger
306   than a TOC entry.  */
307
308#undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
309#define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)			\
310  (TARGET_TOC								\
311   && (GET_CODE (X) == SYMBOL_REF					\
312       || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS	\
313	   && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)		\
314       || GET_CODE (X) == LABEL_REF					\
315       || (GET_CODE (X) == CONST_INT 					\
316	   && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))	\
317       || (GET_CODE (X) == CONST_DOUBLE					\
318	   && (TARGET_POWERPC64						\
319	       || TARGET_MINIMAL_TOC					\
320	       || (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT		\
321		   && ! TARGET_NO_FP_IN_TOC)))))
322
323/* This is the same as the dbxelf.h version, except that we need to
324   use the function code label, not the function descriptor.  */
325#undef	ASM_OUTPUT_SOURCE_LINE
326#define	ASM_OUTPUT_SOURCE_LINE(FILE, LINE)				\
327do									\
328  {									\
329    static int sym_lineno = 1;						\
330    char temp[256];							\
331    ASM_GENERATE_INTERNAL_LABEL (temp, "LM", sym_lineno);		\
332    fprintf (FILE, "\t.stabn 68,0,%d,", LINE);				\
333    assemble_name (FILE, temp);						\
334    fputs ("-.", FILE);							\
335    assemble_name (FILE,						\
336		   XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
337    putc ('\n', FILE);							\
338    ASM_OUTPUT_INTERNAL_LABEL (FILE, "LM", sym_lineno);			\
339    sym_lineno += 1;							\
340  }									\
341while (0)
342
343/* Similarly, we want the function code label here.  */
344#define DBX_OUTPUT_BRAC(FILE, NAME, BRAC) \
345  do									\
346    {									\
347      const char *flab;							\
348      fprintf (FILE, "%s%d,0,0,", ASM_STABN_OP, BRAC);			\
349      assemble_name (FILE, NAME);					\
350      putc ('-', FILE);							\
351      if (current_function_func_begin_label != NULL_TREE)		\
352	flab = IDENTIFIER_POINTER (current_function_func_begin_label);	\
353      else								\
354	{								\
355	  putc ('.', FILE);						\
356	  flab = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);	\
357	}								\
358      assemble_name (FILE, flab);					\
359      putc ('\n', FILE);						\
360    }									\
361  while (0)
362
363#define DBX_OUTPUT_LBRAC(FILE, NAME) DBX_OUTPUT_BRAC (FILE, NAME, N_LBRAC)
364#define DBX_OUTPUT_RBRAC(FILE, NAME) DBX_OUTPUT_BRAC (FILE, NAME, N_RBRAC)
365
366/* Another case where we want the dot name.  */
367#define	DBX_OUTPUT_NFUN(FILE, LSCOPE, DECL)				\
368  do									\
369    {									\
370      fprintf (FILE, "%s\"\",%d,0,0,", ASM_STABS_OP, N_FUN);		\
371      assemble_name (FILE, LSCOPE);					\
372      fputs ("-.", FILE);						\
373      assemble_name (FILE, XSTR (XEXP (DECL_RTL (DECL), 0), 0));	\
374      putc ('\n', FILE);						\
375    }									\
376  while (0)
377
378/* Override sysv4.h as these are ABI_V4 only.  */
379#undef	ASM_OUTPUT_REG_PUSH
380#undef	ASM_OUTPUT_REG_POP
381
382/* Select a format to encode pointers in exception handling data.  CODE
383   is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
384   true if the symbol may be affected by dynamic relocations.  */
385#undef	ASM_PREFERRED_EH_DATA_FORMAT
386#define	ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
387  (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_udata8)
388