freebsd.h revision 217396 
1/* Definitions for PowerPC running FreeBSD using the ELF format
2   Copyright (C) 2001, 2003 Free Software Foundation, Inc.
3   Contributed by David E. O'Brien <obrien@FreeBSD.org> and BSDi.
4
5   This file is part of GCC.
6
7   GCC is free software; you can redistribute it and/or modify it
8   under the terms of the GNU General Public License as published
9   by the Free Software Foundation; either version 2, or (at your
10   option) any later version.
11
12   GCC is distributed in the hope that it will be useful, but WITHOUT
13   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
15   License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with GCC; see the file COPYING.  If not, write to the
19   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
20   MA 02110-1301, USA.  */
21
22/* Override the defaults, which exist to force the proper definition.  */
23
24#ifdef IN_LIBGCC2
25#undef TARGET_64BIT
26#ifdef __powerpc64__
27#define TARGET_64BIT 1
28#else
29#define TARGET_64BIT 0
30#endif
31#endif
32
33/* On 64-bit systems, use the AIX ABI like Linux and NetBSD */
34
35#undef	DEFAULT_ABI
36#define	DEFAULT_ABI (TARGET_64BIT ? ABI_AIX : ABI_V4)
37#undef	TARGET_AIX
38#define	TARGET_AIX TARGET_64BIT
39
40#undef  FBSD_TARGET_CPU_CPP_BUILTINS
41#define FBSD_TARGET_CPU_CPP_BUILTINS()		\
42  do						\
43    {						\
44      builtin_define ("__PPC__");		\
45      builtin_define ("__ppc__");		\
46      builtin_define ("__PowerPC__");		\
47      builtin_define ("__powerpc__");		\
48      if (TARGET_64BIT)				\
49	{					\
50	  builtin_define ("__LP64__");		\
51	  builtin_define ("__ppc64__");		\
52	  builtin_define ("__powerpc64__");	\
53	  builtin_define ("__arch64__");	\
54	  builtin_assert ("cpu=powerpc64");	\
55	  builtin_assert ("machine=powerpc64");	\
56	} else {				\
57	  builtin_assert ("cpu=powerpc");	\
58	  builtin_assert ("machine=powerpc");	\
59	}					\
60    }						\
61  while (0)
62
63#define INVALID_64BIT "-m%s not supported in this configuration"
64#define INVALID_32BIT INVALID_64BIT
65
66#undef	SUBSUBTARGET_OVERRIDE_OPTIONS
67#define	SUBSUBTARGET_OVERRIDE_OPTIONS				\
68  do								\
69    {								\
70      if (!rs6000_explicit_options.alignment)			\
71	rs6000_alignment_flags = MASK_ALIGN_NATURAL;		\
72      if (TARGET_64BIT)						\
73	{							\
74	  if (DEFAULT_ABI != ABI_AIX)				\
75	    {							\
76	      rs6000_current_abi = ABI_AIX;			\
77	      error (INVALID_64BIT, "call");			\
78	    }							\
79	  dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");	\
80	  if (target_flags & MASK_RELOCATABLE)			\
81	    {							\
82	      target_flags &= ~MASK_RELOCATABLE;		\
83	      error (INVALID_64BIT, "relocatable");		\
84	    }							\
85	  if (target_flags & MASK_EABI)				\
86	    {							\
87	      target_flags &= ~MASK_EABI;			\
88	      error (INVALID_64BIT, "eabi");			\
89	    }							\
90	  if (target_flags & MASK_PROTOTYPE)			\
91	    {							\
92	      target_flags &= ~MASK_PROTOTYPE;			\
93	      error (INVALID_64BIT, "prototype");		\
94	    }							\
95	  if ((target_flags & MASK_POWERPC64) == 0)		\
96	    {							\
97	      target_flags |= MASK_POWERPC64;			\
98	      error ("64 bit CPU required");			\
99	    }							\
100	}							\
101    }								\
102  while (0)
103
104
105#undef	STARTFILE_DEFAULT_SPEC
106#define STARTFILE_DEFAULT_SPEC "%(startfile_freebsd)"
107
108#undef	ENDFILE_DEFAULT_SPEC
109#define ENDFILE_DEFAULT_SPEC "%(endfile_freebsd)"
110
111#undef	LIB_DEFAULT_SPEC
112#define LIB_DEFAULT_SPEC "%(lib_freebsd)"
113
114#undef	LINK_START_DEFAULT_SPEC
115#define LINK_START_DEFAULT_SPEC "%(link_start_freebsd)"
116
117#undef	LINK_OS_DEFAULT_SPEC
118#define	LINK_OS_DEFAULT_SPEC "%(link_os_freebsd)"
119
120/* XXX: This is wrong for many platforms in sysv4.h.
121   We should work on getting that definition fixed.  */
122#undef  LINK_SHLIB_SPEC
123#define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
124
125
126/************************[  Target stuff  ]***********************************/
127
128/* Define the actual types of some ANSI-mandated types.
129   Needs to agree with <machine/ansi.h>.  GCC defaults come from c-decl.c,
130   c-common.c, and config/<arch>/<arch>.h.  */
131
132#undef  SIZE_TYPE
133#define SIZE_TYPE	(TARGET_64BIT ? "long unsigned int" : "unsigned int")
134
135#undef  PTRDIFF_TYPE
136#define PTRDIFF_TYPE	(TARGET_64BIT ? "long int" : "int")
137
138/* rs6000.h gets this wrong for FreeBSD.  We use the GCC defaults instead.  */
139#undef WCHAR_TYPE
140
141#undef  WCHAR_TYPE_SIZE
142#define WCHAR_TYPE_SIZE 32
143
144#undef  TARGET_VERSION
145#define TARGET_VERSION fprintf (stderr, " (FreeBSD/PowerPC ELF)");
146
147/* Override rs6000.h definition.  */
148#undef  ASM_APP_ON
149#define ASM_APP_ON "#APP\n"
150
151/* Override rs6000.h definition.  */
152#undef  ASM_APP_OFF
153#define ASM_APP_OFF "#NO_APP\n"
154
155/* Tell the assembler we want 32/64-bit binaries if -m32 or -m64 is passed */
156#if (TARGET_DEFAULT & MASK_64BIT)
157#define	SVR4_ASM_SPEC "%(asm_cpu) \
158%{.s: %{mregnames} %{mno-regnames}} %{.S: %{mregnames} %{mno-regnames}} \
159%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*} \
160%{mrelocatable} %{mrelocatable-lib} %{fpic|fpie|fPIC|fPIE:-K PIC} \
161%{memb|msdata|msdata=eabi: -memb} \
162%{mlittle|mlittle-endian:-mlittle; \
163  mbig|mbig-endian      :-mbig;    \
164  mcall-aixdesc |		   \
165  mcall-freebsd |		   \
166  mcall-netbsd  |		   \
167  mcall-openbsd |		   \
168  mcall-linux   |		   \
169  mcall-gnu             :-mbig;    \
170  mcall-i960-old        :-mlittle}"
171#define LINK_OS_FREEBSD_SPEC_DEF "\
172  %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
173  %{v:-V} \
174  %{assert*} %{R*} %{rpath*} %{defsym*} \
175  %{shared:-Bshareable %{h*} %{soname*}} \
176  %{!shared: \
177    %{!static: \
178      %{rdynamic: -export-dynamic} \
179      %{!dynamic-linker:-dynamic-linker %(fbsd_dynamic_linker) }} \
180    %{static:-Bstatic}} \
181  %{symbolic:-Bsymbolic}"
182
183
184#undef	ASM_DEFAULT_SPEC
185#undef	ASM_SPEC
186#undef	LINK_OS_FREEBSD_SPEC
187#define	ASM_DEFAULT_SPEC	"-mppc%{!m32:64}"
188#define	ASM_SPEC		"%{m32:-a32}%{!m32:-a64} " SVR4_ASM_SPEC
189#define	LINK_OS_FREEBSD_SPEC	"%{m32:-melf32ppc}%{!m32:-melf64ppc} " LINK_OS_FREEBSD_SPEC_DEF
190#endif
191
192/* _init and _fini functions are built from bits spread across many
193   object files, each potentially with a different TOC pointer.  For
194   that reason, place a nop after the call so that the linker can
195   restore the TOC pointer if a TOC adjusting call stub is needed.  */
196#ifdef __powerpc64__
197#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)	\
198  asm (SECTION_OP "\n"					\
199"	bl ." #FUNC "\n"				\
200"	nop\n"						\
201"	.previous");
202#endif
203
204/* __throw will restore its own return address to be the same as the
205   return address of the function that the throw is being made to.
206   This is unfortunate, because we want to check the original
207   return address to see if we need to restore the TOC.
208   So we have to squirrel it away with this.  */
209#define SETUP_FRAME_ADDRESSES() \
210  do { if (TARGET_64BIT) rs6000_aix_emit_builtin_unwind_init (); } while (0)
211
212/* Select a format to encode pointers in exception handling data.  CODE
213   is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
214   true if the symbol may be affected by dynamic relocations.  */
215#undef	ASM_PREFERRED_EH_DATA_FORMAT
216#define	ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
217  ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)			\
218   ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel		\
219      | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))		\
220   : DW_EH_PE_absptr)
221
222#ifdef __powerpc64__
223#define MD_FROB_UPDATE_CONTEXT(CTX, FS)					\
224    if ((FS)->regs.reg[2].how == REG_UNSAVED)				\
225      {									\
226	unsigned int *insn = (unsigned int *)				\
227	    _Unwind_GetGR ((CTX), LINK_REGISTER_REGNUM);		\
228	if (insn != NULL && *insn == 0xE8410028)			\
229	  _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 40);			\
230      }
231#endif
232
233#define TARGET_ASM_FILE_END rs6000_elf_end_indicate_exec_stack
234
235/* FreeBSD doesn't support saving and restoring 64-bit regs with a 32-bit
236   kernel. This is supported when running on a 64-bit kernel with
237   COMPAT_FREEBSD32, but tell GCC it isn't so that our 32-bit binaries
238   are compatible. */
239#define OS_MISSING_POWERPC64 !TARGET_64BIT
240
241/* Function profiling bits */
242#undef  RS6000_MCOUNT
243#define RS6000_MCOUNT ((TARGET_64BIT) ? "._mcount" : "_mcount")
244#define PROFILE_HOOK(LABEL) \
245  do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
246
247#undef NEED_INDICATE_EXEC_STACK
248#define NEED_INDICATE_EXEC_STACK 1
249