[gcc.git] / gcc / config / arm / linux-elf.h

/* Definitions for ARM running Linux-based GNU systems using ELF
   Copyright (C) 1993, 1994, 1997, 1998, 1999 Free Software Foundation, Inc.
   Contributed by Philip Blundell <philb@gnu.org>

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Run-time Target Specification.  */
#define TARGET_VERSION  fputs (" (ARM GNU/Linux with ELF)", stderr);

/* We have libgcc2.  */
#define HAVE_ATEXIT

/* Default is to use APCS-32 mode.  */
#ifndef SUBTARGET_DEFAULT_APCS26
#define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_SHORT_BYTE)
#define SUBTARGET_EXTRA_LINK_SPEC	\
	" %{mapcs-26:-m elf32arm26} %{!mapcs-26:-m elf32arm}"
#define SUBTARGET_EXTRA_ASM_SPEC	\
	" %{mapcs-26:-mapcs-26} %(!mapcs-26:-mapcs-32}"
#endif

/* Now we define the strings used to build the spec file.  */
#define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"

/* Add the compiler's crtend, and the library's crtn.  */
#define ENDFILE_SPEC "%{!shared:crtend.o%s} %{shared:crtendS.o%s} \
   %{pg:gcrtn.o%s}%{!pg:crtn.o%s}"

#define STARTFILE_SPEC "%{!shared:crt1.o%s} \
   crti.o%s \
   %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"

#define LINK_SPEC "%{h*} %{version:-v} \
   %{b} %{Wl,*:%*} \
   %{static:-Bstatic} \
   %{shared:-shared} \
   %{symbolic:-Bsymbolic} \
   %{rdynamic:-export-dynamic} \
   %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
   -X \
   %{mbig-endian:-EB}" \
   SUBTARGET_EXTRA_LINK_SPEC

#undef  CPP_PREDEFINES
#define CPP_PREDEFINES \
"-Dunix -Darm -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(arm) \
-Amachine(arm) -D__ELF__ -Darm_elf"

#ifndef SUBTARGET_DEFAULT_APCS26
#undef  CPP_APCS_PC_DEFAULT_SPEC
#define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
#endif

/* Allow #sccs in preprocessor.  */
#define SCCS_DIRECTIVE

#define USER_LABEL_PREFIX 	""	/* For ELF the default is no underscores */
#define LOCAL_LABEL_PREFIX 	"."

/* Attach a special .ident directive to the end of the file to identify
   the version of GCC which compiled this code.  */
#define IDENT_ASM_OP 	".ident"

/* Output #ident as a .ident.  */
#define ASM_OUTPUT_IDENT(FILE, NAME) \
  fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
  
#ifdef IDENTIFY_WITH_IDENT
#define ASM_IDENTIFY_GCC(FILE) /* nothing */
#define ASM_IDENTIFY_LANGUAGE(FILE)			\
 fprintf (FILE, "\t%s \"GCC (%s) %s\"\n", IDENT_ASM_OP,	\
	 lang_identify (), version_string)
#else
#define ASM_FILE_END(FILE)					\
do {				 				\
     if (!flag_no_ident)					\
	fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n",		\
		 IDENT_ASM_OP, version_string);			\
   } while (0)
#endif

/* Support const sections and the ctors and dtors sections for g++.
   Note that there appears to be two different ways to support const
   sections at the moment.  You can either #define the symbol
   READONLY_DATA_SECTION (giving it some code which switches to the
   readonly data section) or else you can #define the symbols
   EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
   SELECT_RTX_SECTION.  We do both here just to be on the safe side.  */
#define USE_CONST_SECTION	1

/* Support for Constructors and Destructors.  */
#define READONLY_DATA_SECTION() const_section ()

/* A default list of other sections which we might be "in" at any given
   time.  For targets that use additional sections (e.g. .tdesc) you
   should override this definition in the target-specific file which
   includes this file.  */
#define SUBTARGET_EXTRA_SECTIONS in_const,

/* A default list of extra section function definitions.  For targets
   that use additional sections (e.g. .tdesc) you should override this
   definition in the target-specific file which includes this file.  */
#define SUBTARGET_EXTRA_SECTION_FUNCTIONS	CONST_SECTION_FUNCTION

extern void text_section ();

#define CONST_SECTION_ASM_OP	".section\t.rodata"

#define CONST_SECTION_FUNCTION						\
void									\
const_section ()							\
{									\
  if (!USE_CONST_SECTION)						\
    text_section ();							\
  else if (in_section != in_const)					\
    {									\
      fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP);		\
      in_section = in_const;						\
    }									\
}

/* Switch into a generic section.
   This is currently only used to support section attributes.

   We make the section read-only and executable for a function decl,
   read-only for a const data decl, and writable for a non-const data decl.  */
#define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
  fprintf (FILE, ".section\t%s,\"%s\",%%progbits\n", NAME, \
	   (DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
	   (DECL) && DECL_READONLY_SECTION (DECL, RELOC) ? "a" : "aw")

/* A C statement or statements to switch to the appropriate
   section for output of DECL.  DECL is either a `VAR_DECL' node
   or a constant of some sort.  RELOC indicates whether forming
   the initial value of DECL requires link-time relocations.  */
#define SELECT_SECTION(DECL,RELOC)					\
{									\
  if (TREE_CODE (DECL) == STRING_CST)					\
    {									\
      if (! flag_writable_strings)					\
	const_section ();						\
      else								\
	data_section ();						\
    }									\
  else if (TREE_CODE (DECL) == VAR_DECL)				\
    {									\
      if ((flag_pic && RELOC)						\
	  || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)		\
	  || !DECL_INITIAL (DECL)					\
	  || (DECL_INITIAL (DECL) != error_mark_node			\
	      && !TREE_CONSTANT (DECL_INITIAL (DECL))))			\
	data_section ();						\
      else								\
	const_section ();						\
    }									\
  else									\
    const_section ();							\
}

/* A C statement or statements to switch to the appropriate
   section for output of RTX in mode MODE.  RTX is some kind
   of constant in RTL.  The argument MODE is redundant except
   in the case of a `const_int' rtx.  Currently, these always
   go into the const section.  */
#define SELECT_RTX_SECTION(MODE,RTX) const_section ()

/* On svr4, we *do* have support for the .init and .fini sections, and we
   can put stuff in there to be executed before and after `main'.  We let
   crtstuff.c and other files know this by defining the following symbols.
   The definitions say how to change sections to the .init and .fini
   sections.  This is the same for all known svr4 assemblers.  */
#define INIT_SECTION_ASM_OP	".section\t.init"
#define FINI_SECTION_ASM_OP	".section\t.fini"


/* This is how we tell the assembler that a symbol is weak.  */
#define ASM_WEAKEN_LABEL(FILE,NAME) \
  do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
       fputc ('\n', FILE); } while (0)

/* This is how we tell the assembler that two symbols have the same value.  */

#define ASM_OUTPUT_DEF(FILE,NAME1,NAME2) \
  do { assemble_name (FILE, NAME1); 	 \
       fputs (" = ", FILE);		 \
       assemble_name (FILE, NAME2);	 \
       fputc ('\n', FILE); } while (0)

#include "arm/elf.h"
#include "arm/linux-gas.h"
Commit	Line	Data
b355a481	1	/* Definitions for ARM running Linux-based GNU systems using ELF
be163a70	2	Copyright (C) 1993, 1994, 1997, 1998, 1999 Free Software Foundation, Inc.
b355a481 NC	3	Contributed by Philip Blundell <philb@gnu.org>
	4
	5	This file is part of GNU CC.
	6
	7	GNU CC is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2, or (at your option)
	10	any later version.
	11
	12	GNU CC is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; see the file COPYING. If not, write to
	19	the Free Software Foundation, 59 Temple Place - Suite 330,
	20	Boston, MA 02111-1307, USA. */
	21
	22	/* Run-time Target Specification. */
	23	#define TARGET_VERSION fputs (" (ARM GNU/Linux with ELF)", stderr);
	24
	25	/* We have libgcc2. */
	26	#define HAVE_ATEXIT
	27
	28	/* Default is to use APCS-32 mode. */
	29	#ifndef SUBTARGET_DEFAULT_APCS26
	30	#define TARGET_DEFAULT (ARM_FLAG_APCS_32 \| ARM_FLAG_SHORT_BYTE)
	31	#define SUBTARGET_EXTRA_LINK_SPEC \
	32	" %{mapcs-26:-m elf32arm26} %{!mapcs-26:-m elf32arm}"
	33	#define SUBTARGET_EXTRA_ASM_SPEC \
	34	" %{mapcs-26:-mapcs-26} %(!mapcs-26:-mapcs-32}"
	35	#endif
	36
	37	/* Now we define the strings used to build the spec file. */
	38	#define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
	39
	40	/* Add the compiler's crtend, and the library's crtn. */
	41	#define ENDFILE_SPEC "%{!shared:crtend.o%s} %{shared:crtendS.o%s} \
	42	%{pg:gcrtn.o%s}%{!pg:crtn.o%s}"
	43
	44	#define STARTFILE_SPEC "%{!shared:crt1.o%s} \
	45	crti.o%s \
	46	%{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
	47
	48	#define LINK_SPEC "%{h*} %{version:-v} \
	49	%{b} %{Wl,:%} \
	50	%{static:-Bstatic} \
	51	%{shared:-shared} \
	52	%{symbolic:-Bsymbolic} \
	53	%{rdynamic:-export-dynamic} \
	54	%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
	55	-X \
	56	%{mbig-endian:-EB}" \
	57	SUBTARGET_EXTRA_LINK_SPEC
	58
	59	#undef CPP_PREDEFINES
	60	#define CPP_PREDEFINES \
	61	"-Dunix -Darm -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(arm) \
	62	-Amachine(arm) -D__ELF__ -Darm_elf"
	63
	64	#ifndef SUBTARGET_DEFAULT_APCS26
	65	#undef CPP_APCS_PC_DEFAULT_SPEC
	66	#define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
67	#endif
68
69	/* Allow #sccs in preprocessor. */
70	#define SCCS_DIRECTIVE
71
72	#define USER_LABEL_PREFIX "" /* For ELF the default is no underscores */
73	#define LOCAL_LABEL_PREFIX "."
74
75	/* Attach a special .ident directive to the end of the file to identify
76	the version of GCC which compiled this code. */
77	#define IDENT_ASM_OP ".ident"
78
79	/* Output #ident as a .ident. */
80	#define ASM_OUTPUT_IDENT(FILE, NAME) \
81	fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
82
83	#ifdef IDENTIFY_WITH_IDENT
84	#define ASM_IDENTIFY_GCC(FILE) /* nothing */
85	#define ASM_IDENTIFY_LANGUAGE(FILE) \
86	fprintf (FILE, "\t%s \"GCC (%s) %s\"\n", IDENT_ASM_OP, \
87	lang_identify (), version_string)
88	#else
89	#define ASM_FILE_END(FILE) \
90	do { \
be163a70 ZW	91	if (!flag_no_ident) \
	92	fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \
	93	IDENT_ASM_OP, version_string); \
b355a481 NC	94	} while (0)
	95	#endif
	96
	97	/* Support const sections and the ctors and dtors sections for g++.
	98	Note that there appears to be two different ways to support const
	99	sections at the moment. You can either #define the symbol
	100	READONLY_DATA_SECTION (giving it some code which switches to the
	101	readonly data section) or else you can #define the symbols
	102	EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
	103	SELECT_RTX_SECTION. We do both here just to be on the safe side. */
	104	#define USE_CONST_SECTION 1
	105
	106	/* Support for Constructors and Destructors. */
	107	#define READONLY_DATA_SECTION() const_section ()
	108
	109	/* A default list of other sections which we might be "in" at any given
	110	time. For targets that use additional sections (e.g. .tdesc) you
	111	should override this definition in the target-specific file which
	112	includes this file. */
	113	#define SUBTARGET_EXTRA_SECTIONS in_const,
	114
	115	/* A default list of extra section function definitions. For targets
	116	that use additional sections (e.g. .tdesc) you should override this
	117	definition in the target-specific file which includes this file. */
	118	#define SUBTARGET_EXTRA_SECTION_FUNCTIONS CONST_SECTION_FUNCTION
	119
	120	extern void text_section ();
	121
	122	#define CONST_SECTION_ASM_OP ".section\t.rodata"
	123
	124	#define CONST_SECTION_FUNCTION \
	125	void \
	126	const_section () \
	127	{ \
	128	if (!USE_CONST_SECTION) \
	129	text_section (); \
	130	else if (in_section != in_const) \
	131	{ \
	132	fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
	133	in_section = in_const; \
	134	} \
	135	}
	136
	137	/* Switch into a generic section.
	138	This is currently only used to support section attributes.
	139
	140	We make the section read-only and executable for a function decl,
	141	read-only for a const data decl, and writable for a non-const data decl. */
	142	#define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
	143	fprintf (FILE, ".section\t%s,\"%s\",%%progbits\n", NAME, \
	144	(DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
	145	(DECL) && DECL_READONLY_SECTION (DECL, RELOC) ? "a" : "aw")
	146
	147	/* A C statement or statements to switch to the appropriate
	148	section for output of DECL. DECL is either a `VAR_DECL' node
	149	or a constant of some sort. RELOC indicates whether forming
	150	the initial value of DECL requires link-time relocations. */
	151	#define SELECT_SECTION(DECL,RELOC) \
	152	{ \
	153	if (TREE_CODE (DECL) == STRING_CST) \
	154	{ \
	155	if (! flag_writable_strings) \
	156	const_section (); \
	157	else \
158	data_section (); \
159	} \
160	else if (TREE_CODE (DECL) == VAR_DECL) \
161	{ \
162	if ((flag_pic && RELOC) \
163	\|\| !TREE_READONLY (DECL) \|\| TREE_SIDE_EFFECTS (DECL) \
164	\|\| !DECL_INITIAL (DECL) \
165	\|\| (DECL_INITIAL (DECL) != error_mark_node \
166	&& !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
167	data_section (); \
168	else \
169	const_section (); \
170	} \
171	else \
172	const_section (); \
173	}
174
175	/* A C statement or statements to switch to the appropriate
176	section for output of RTX in mode MODE. RTX is some kind
177	of constant in RTL. The argument MODE is redundant except
178	in the case of a `const_int' rtx. Currently, these always
179	go into the const section. */
180	#define SELECT_RTX_SECTION(MODE,RTX) const_section ()
181
182	/* On svr4, we do have support for the .init and .fini sections, and we
183	can put stuff in there to be executed before and after `main'. We let
184	crtstuff.c and other files know this by defining the following symbols.
185	The definitions say how to change sections to the .init and .fini
186	sections. This is the same for all known svr4 assemblers. */
187	#define INIT_SECTION_ASM_OP ".section\t.init"
188	#define FINI_SECTION_ASM_OP ".section\t.fini"
189
190
191	/* This is how we tell the assembler that a symbol is weak. */
192	#define ASM_WEAKEN_LABEL(FILE,NAME) \
193	do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
194	fputc ('\n', FILE); } while (0)
195
196	/* This is how we tell the assembler that two symbols have the same value. */
197
198	#define ASM_OUTPUT_DEF(FILE,NAME1,NAME2) \
199	do { assemble_name (FILE, NAME1); \
200	fputs (" = ", FILE); \
201	assemble_name (FILE, NAME2); \
202	fputc ('\n', FILE); } while (0)
203
204	#include "arm/elf.h"
205	#include "arm/linux-gas.h"