linux64.h revision 122180 
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#define LINK_GCC_C_SEQUENCE_SPEC \
141  "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
142
143#undef  LIB_DEFAULT_SPEC
144#define LIB_DEFAULT_SPEC "%(lib_linux)"
145
146#undef  STARTFILE_DEFAULT_SPEC
147#define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
148
149#undef	ENDFILE_DEFAULT_SPEC
150#define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
151
152#undef	LINK_START_DEFAULT_SPEC
153#define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
154
155#undef	LINK_OS_DEFAULT_SPEC
156#define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
157
158#undef  LINK_OS_LINUX_SPEC
159#define LINK_OS_LINUX_SPEC "-m elf64ppc %{!shared: %{!static: \
160  %{rdynamic:-export-dynamic} \
161  %{!dynamic-linker:-dynamic-linker /lib64/ld64.so.1}}}"
162
163#ifdef NATIVE_CROSS
164#define STARTFILE_PREFIX_SPEC "/usr/local/lib64/ /lib64/ /usr/lib64/"
165#endif
166
167#undef  STARTFILE_LINUX_SPEC
168#define STARTFILE_LINUX_SPEC "\
169%{!shared: %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} %{!p:crt1.o%s}}} crti.o%s \
170%{static:crtbeginT.o%s} \
171%{!static:%{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}}"
172
173#undef  ENDFILE_LINUX_SPEC
174#define ENDFILE_LINUX_SPEC "\
175%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
176
177#undef  TOC_SECTION_ASM_OP
178#define TOC_SECTION_ASM_OP "\t.section\t\".toc\",\"aw\""
179
180#undef  MINIMAL_TOC_SECTION_ASM_OP
181#define MINIMAL_TOC_SECTION_ASM_OP "\t.section\t\".toc1\",\"aw\""
182
183#undef  TARGET_VERSION
184#define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
185
186/* Must be at least as big as our pointer type.  */
187#undef  SIZE_TYPE
188#define SIZE_TYPE "long unsigned int"
189
190#undef  PTRDIFF_TYPE
191#define PTRDIFF_TYPE "long int"
192
193#undef  WCHAR_TYPE
194#define WCHAR_TYPE "int"
195#undef  WCHAR_TYPE_SIZE
196#define WCHAR_TYPE_SIZE 32
197
198/* Override rs6000.h definition.  */
199#undef  ASM_APP_ON
200#define ASM_APP_ON "#APP\n"
201
202/* Override rs6000.h definition.  */
203#undef  ASM_APP_OFF
204#define ASM_APP_OFF "#NO_APP\n"
205
206/* PowerPC no-op instruction.  */
207#undef  RS6000_CALL_GLUE
208#define RS6000_CALL_GLUE "nop"
209
210#undef  RS6000_MCOUNT
211#define RS6000_MCOUNT "_mcount"
212
213#ifdef __powerpc64__
214/* _init and _fini functions are built from bits spread across many
215   object files, each potentially with a different TOC pointer.  For
216   that reason, place a nop after the call so that the linker can
217   restore the TOC pointer if a TOC adjusting call stub is needed.  */
218#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)	\
219  asm (SECTION_OP "\n"					\
220"	bl ." #FUNC "\n"				\
221"	nop\n"						\
222"	.previous");
223#endif
224
225/* FP save and restore routines.  */
226#undef  SAVE_FP_PREFIX
227#define SAVE_FP_PREFIX "._savef"
228#undef  SAVE_FP_SUFFIX
229#define SAVE_FP_SUFFIX ""
230#undef  RESTORE_FP_PREFIX
231#define RESTORE_FP_PREFIX "._restf"
232#undef  RESTORE_FP_SUFFIX
233#define RESTORE_FP_SUFFIX ""
234
235/* Dwarf2 debugging.  */
236#undef  PREFERRED_DEBUGGING_TYPE
237#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
238
239#undef  TARGET_ENCODE_SECTION_INFO
240#define TARGET_ENCODE_SECTION_INFO  rs6000_xcoff_encode_section_info
241
242/* This is how to output a reference to a user-level label named NAME.
243   `assemble_name' uses this.  */
244
245/* Override elfos.h definition.  */
246#undef  ASM_OUTPUT_LABELREF
247#define ASM_OUTPUT_LABELREF(FILE,NAME)		\
248do {						\
249  const char *_name = NAME;			\
250  if (*_name == '@')				\
251    _name++;					\
252 						\
253  if (*_name == '*')				\
254    fprintf (FILE, "%s", _name + 1);		\
255  else						\
256    asm_fprintf (FILE, "%U%s", _name);		\
257} while (0)
258
259#undef  ASM_DECLARE_FUNCTION_NAME
260#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)			\
261  do									\
262    {									\
263      fputs ("\t.section\t\".opd\",\"aw\"\n\t.align 3\n", (FILE));	\
264      ASM_OUTPUT_LABEL ((FILE), (NAME));				\
265      fputs (DOUBLE_INT_ASM_OP, (FILE));				\
266      putc ('.', (FILE));						\
267      assemble_name ((FILE), (NAME));					\
268      fputs (",.TOC.@tocbase,0\n\t.previous\n\t.size\t", (FILE));	\
269      assemble_name ((FILE), (NAME));					\
270      fputs (",24\n\t.type\t.", (FILE));				\
271      assemble_name ((FILE), (NAME));					\
272      fputs (",@function\n", (FILE));					\
273      if (TREE_PUBLIC (DECL) && ! DECL_WEAK (DECL))			\
274        {								\
275	  fputs ("\t.globl\t.", (FILE));				\
276	  assemble_name ((FILE), (NAME));				\
277	  putc ('\n', (FILE));						\
278        }								\
279      ASM_DECLARE_RESULT ((FILE), DECL_RESULT (DECL));			\
280      putc ('.', (FILE));						\
281      ASM_OUTPUT_LABEL ((FILE), (NAME));				\
282    }									\
283  while (0)
284
285/* This is how to declare the size of a function.  */
286#undef	ASM_DECLARE_FUNCTION_SIZE
287#define	ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)			\
288  do									\
289    {									\
290      if (!flag_inhibit_size_directive)					\
291	{								\
292	  fputs ("\t.size\t.", (FILE));					\
293	  assemble_name ((FILE), (FNAME));				\
294	  fputs (",.-.", (FILE));					\
295	  assemble_name ((FILE), (FNAME));				\
296	  putc ('\n', (FILE));						\
297	}								\
298    }									\
299  while (0)
300
301/* Return nonzero if this entry is to be written into the constant
302   pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
303   or a CONST containing one of them.  If -mfp-in-toc (the default),
304   we also do this for floating-point constants.  We actually can only
305   do this if the FP formats of the target and host machines are the
306   same, but we can't check that since not every file that uses
307   GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
308   we can write the entry into the TOC and the entry is not larger
309   than a TOC entry.  */
310
311#undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
312#define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)			\
313  (TARGET_TOC								\
314   && (GET_CODE (X) == SYMBOL_REF					\
315       || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS	\
316	   && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)		\
317       || GET_CODE (X) == LABEL_REF					\
318       || (GET_CODE (X) == CONST_INT 					\
319	   && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))	\
320       || (GET_CODE (X) == CONST_DOUBLE					\
321	   && (TARGET_POWERPC64						\
322	       || TARGET_MINIMAL_TOC					\
323	       || (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT		\
324		   && ! TARGET_NO_FP_IN_TOC)))))
325
326/* This is the same as the dbxelf.h version, except that we need to
327   use the function code label, not the function descriptor.  */
328#undef	ASM_OUTPUT_SOURCE_LINE
329#define	ASM_OUTPUT_SOURCE_LINE(FILE, LINE)				\
330do									\
331  {									\
332    static int sym_lineno = 1;						\
333    char temp[256];							\
334    ASM_GENERATE_INTERNAL_LABEL (temp, "LM", sym_lineno);		\
335    fprintf (FILE, "\t.stabn 68,0,%d,", LINE);				\
336    assemble_name (FILE, temp);						\
337    fputs ("-.", FILE);							\
338    assemble_name (FILE,						\
339		   XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
340    putc ('\n', FILE);							\
341    ASM_OUTPUT_INTERNAL_LABEL (FILE, "LM", sym_lineno);			\
342    sym_lineno += 1;							\
343  }									\
344while (0)
345
346/* Similarly, we want the function code label here.  */
347#define DBX_OUTPUT_BRAC(FILE, NAME, BRAC) \
348  do									\
349    {									\
350      const char *flab;							\
351      fprintf (FILE, "%s%d,0,0,", ASM_STABN_OP, BRAC);			\
352      assemble_name (FILE, NAME);					\
353      putc ('-', FILE);							\
354      if (current_function_func_begin_label != NULL_TREE)		\
355	flab = IDENTIFIER_POINTER (current_function_func_begin_label);	\
356      else								\
357	{								\
358	  putc ('.', FILE);						\
359	  flab = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);	\
360	}								\
361      assemble_name (FILE, flab);					\
362      putc ('\n', FILE);						\
363    }									\
364  while (0)
365
366#define DBX_OUTPUT_LBRAC(FILE, NAME) DBX_OUTPUT_BRAC (FILE, NAME, N_LBRAC)
367#define DBX_OUTPUT_RBRAC(FILE, NAME) DBX_OUTPUT_BRAC (FILE, NAME, N_RBRAC)
368
369/* Another case where we want the dot name.  */
370#define	DBX_OUTPUT_NFUN(FILE, LSCOPE, DECL)				\
371  do									\
372    {									\
373      fprintf (FILE, "%s\"\",%d,0,0,", ASM_STABS_OP, N_FUN);		\
374      assemble_name (FILE, LSCOPE);					\
375      fputs ("-.", FILE);						\
376      assemble_name (FILE, XSTR (XEXP (DECL_RTL (DECL), 0), 0));	\
377      putc ('\n', FILE);						\
378    }									\
379  while (0)
380
381/* Override sysv4.h as these are ABI_V4 only.  */
382#undef	ASM_OUTPUT_REG_PUSH
383#undef	ASM_OUTPUT_REG_POP
384
385/* Select a format to encode pointers in exception handling data.  CODE
386   is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
387   true if the symbol may be affected by dynamic relocations.  */
388#undef	ASM_PREFERRED_EH_DATA_FORMAT
389#define	ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
390  (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_udata8)
391