path: root/gcc/config/arm/elf.h

/* Definitions of target machine for GNU compiler,
   for ARM with ELF obj format.
   Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
   Contributed by Philip Blundell <philb@gnu.org> and
   Catherine Moore <clm@cygnus.com>
   
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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */


#define OBJECT_FORMAT_ELF

#ifndef LOCAL_LABEL_PREFIX
#define LOCAL_LABEL_PREFIX "."
#endif

#ifndef USER_LABEL_PREFIX
#define USER_LABEL_PREFIX ""
#endif

#ifndef CPP_PREDEFINES
#define CPP_PREDEFINES "-Darm -Darm_elf -Acpu(arm) -Amachine(arm) -D__ELF__"
#endif

/* The following macro defines the format used to output the second
   operand of the .type assembler directive.  Different svr4 assemblers
   expect various different forms for this operand.  The one given here
   is just a default.  You may need to override it in your machine-
   specific tm.h file (depending upon the particulars of your assembler).  */
#define TYPE_OPERAND_FMT	"%s"

/* Write the extra assembler code needed to declare a function's result.
   Most svr4 assemblers don't require any special declaration of the
   result value, but there are exceptions.  */
#ifndef ASM_DECLARE_RESULT
#define ASM_DECLARE_RESULT(FILE, RESULT)
#endif

/* These macros generate the special .type and .size directives which
   are used to set the corresponding fields of the linker symbol table
   entries in an ELF object file under SVR4.  These macros also output
   the starting labels for the relevant functions/objects.  */
#define TYPE_ASM_OP     ".type"
#define SIZE_ASM_OP     ".size"

/* Write the extra assembler code needed to declare a function properly.
   Some svr4 assemblers need to also have something extra said about the
   function's return value.  We allow for that here.  */
#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)	\
  do							\
    {							\
      if (TARGET_POKE_FUNCTION_NAME)			\
        arm_poke_function_name (FILE, NAME);		\
      fprintf (FILE, "\t%s\t ", TYPE_ASM_OP);		\
      assemble_name (FILE, NAME);			\
      putc (',', FILE);					\
      fprintf (FILE, TYPE_OPERAND_FMT, "function");	\
      putc ('\n', FILE);				\
      ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));	\
      ASM_OUTPUT_LABEL(FILE, NAME);			\
    }							\
  while (0)

/* Write the extra assembler code needed to declare an object properly.  */
#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)			\
  do {									\
    fprintf (FILE, "\t%s\t ", TYPE_ASM_OP);				\
    assemble_name (FILE, NAME);						\
    putc (',', FILE);							\
    fprintf (FILE, TYPE_OPERAND_FMT, "object");				\
    putc ('\n', FILE);							\
    size_directive_output = 0;						\
    if (!flag_inhibit_size_directive && DECL_SIZE (DECL))		\
      {									\
	size_directive_output = 1;					\
	fprintf (FILE, "\t%s\t ", SIZE_ASM_OP);				\
	assemble_name (FILE, NAME);					\
	putc (',', FILE);						\
	fprintf (FILE, HOST_WIDE_INT_PRINT_DEC,				\
		 int_size_in_bytes (TREE_TYPE (DECL)));			\
	fputc ('\n', FILE);						\
      }									\
    ASM_OUTPUT_LABEL(FILE, NAME);					\
  } while (0)

/* Output the size directive for a decl in rest_of_decl_compilation
   in the case where we did not do so before the initializer.
   Once we find the error_mark_node, we know that the value of
   size_directive_output was set
   by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)	 \
do {									 \
     char * name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);			 \
     if (!flag_inhibit_size_directive && DECL_SIZE (DECL)		 \
         && ! AT_END && TOP_LEVEL					 \
	 && DECL_INITIAL (DECL) == error_mark_node			 \
	 && !size_directive_output)					 \
       {								 \
	 size_directive_output = 1;					 \
	 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP);			 \
	 assemble_name (FILE, name);					 \
	 putc (',', FILE);						 \
	 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC,			 \
		  int_size_in_bytes (TREE_TYPE (DECL))); 		 \
	fputc ('\n', FILE);						 \
       }								 \
   } while (0)

/* This is how to declare the size of a function.  */
#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)			\
  do {									\
    if (!flag_inhibit_size_directive)					\
      {									\
        char label[256];						\
	static int labelno;						\
	labelno ++;							\
	ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno);		\
	ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno);		\
	fprintf (FILE, "\t%s\t ", SIZE_ASM_OP);				\
	assemble_name (FILE, (FNAME));					\
        fprintf (FILE, ",");						\
	assemble_name (FILE, label);					\
        fprintf (FILE, "-");						\
	assemble_name (FILE, (FNAME));					\
	putc ('\n', FILE);						\
      }									\
  } while (0)

/* Define this macro if jump tables (for `tablejump' insns) should be
   output in the text section, along with the assembler instructions.
   Otherwise, the readonly data section is used.  */
#define JUMP_TABLES_IN_TEXT_SECTION 1

#ifndef ASM_SPEC
#define ASM_SPEC "%{mbig-endian:-EB} %{mcpu=*:-m%*} %{march=*:-m%*} \
 %{mapcs-*:-mapcs-%*} %{mthumb-interwork:-mthumb-interwork} %{mapcs-float:mfloat}"
#endif

#ifndef LINK_SPEC
#define LINK_SPEC "%{mbig-endian:-EB} -X"
#endif
  
/* Run-time Target Specification.  */
#ifndef TARGET_VERSION
#define TARGET_VERSION fputs (" (ARM/elf)", stderr)
#endif

#ifndef TARGET_DEFAULT
#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32)
#endif

#ifndef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS { "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork" }
#endif

/* Setting this to 32 produces more efficient code, but the value set in previous
   versions of this toolchain was 8, which produces more compact structures. The
   command line option -mstructure_size_boundary=<n> can be used to change this
   value.  */
#undef  STRUCTURE_SIZE_BOUNDARY
#define STRUCTURE_SIZE_BOUNDARY arm_structure_size_boundary

extern int arm_structure_size_boundary;

/* A C expression whose value is nonzero if IDENTIFIER with arguments ARGS
   is a valid machine specific attribute for DECL.
   The attributes in ATTRIBUTES have previously been assigned to DECL.  */
#define VALID_MACHINE_DECL_ATTRIBUTE(DECL, ATTRIBUTES, IDENTIFIER, ARGS) \
arm_valid_machine_decl_attribute (DECL, IDENTIFIER, ARGS)


/* A C statement to output assembler commands which will identify the
   object file as having been compiled with GNU CC (or another GNU
   compiler).  */
/* Define this to NULL so we don't get anything.
   We have ASM_IDENTIFY_LANGUAGE.
   Also, when using stabs, gcc2_compiled must be a stabs entry, not an
   ordinary symbol, or gdb won't see it.  The stabs entry must be
   before the N_SO in order for gdb to find it.  */
#ifndef ASM_IDENTIFY_GCC
#define ASM_IDENTIFY_GCC(STREAM) 				\
     fprintf (STREAM, "%sgcc2_compiled.:\n", LOCAL_LABEL_PREFIX )
#endif

/* This outputs a lot of .req's to define alias for various registers.
   Let's try to avoid this.  */
#ifndef ASM_FILE_START
#define ASM_FILE_START(STREAM) \
do {								\
  extern char * version_string;					\
  fprintf (STREAM, "%s Generated by gcc %s for ARM/elf\n",	\
	   ASM_COMMENT_START, version_string);			\
  output_file_directive ((STREAM), main_input_filename);	\
} while (0)
#endif
     
/* Output an internal label definition.  */
#ifndef ASM_OUTPUT_INTERNAL_LABEL
#define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM)  	\
  do                                    	      	   	\
    {						      	   	\
      char * s = (char *) alloca (40 + strlen (PREFIX));	\
      extern int arm_target_label, arm_ccfsm_state;	   	\
      extern rtx arm_target_insn;				\
						           	\
      if (arm_ccfsm_state == 3 && arm_target_label == (NUM)   	\
	&& !strcmp (PREFIX, "L"))				\
	{							\
	  arm_ccfsm_state = 0;				        \
	  arm_target_insn = NULL;				\
	}							\
	ASM_GENERATE_INTERNAL_LABEL (s, (PREFIX), (NUM));   	\
	ASM_OUTPUT_LABEL (STREAM, s);	                	\
    } while (0)
#endif

/* Support the ctors/dtors and other sections.  */

/* Define the pseudo-ops used to switch to the .ctors and .dtors sections.

   Note that we want to give these sections the SHF_WRITE attribute
   because these sections will actually contain data (i.e. tables of
   addresses of functions in the current root executable or shared library
   file) and, in the case of a shared library, the relocatable addresses
   will have to be properly resolved/relocated (and then written into) by
   the dynamic linker when it actually attaches the given shared library
   to the executing process.  (Note that on SVR4, you may wish to use the
   `-z text' option to the ELF linker, when building a shared library, as
   an additional check that you are doing everything right.  But if you do
   use the `-z text' option when building a shared library, you will get
   errors unless the .ctors and .dtors sections are marked as writable
   via the SHF_WRITE attribute.)  */
#ifndef CTORS_SECTION_ASM_OP
#define CTORS_SECTION_ASM_OP	"\t.section\t.ctors,\"aw\""
#endif
     
#ifndef DTORS_SECTION_ASM_OP
#define DTORS_SECTION_ASM_OP	"\t.section\t.dtors,\"aw\""
#endif

/* A list of other sections which the compiler might be "in" at any
   given time.  */
#ifndef SUBTARGET_EXTRA_SECTIONS
#define SUBTARGET_EXTRA_SECTIONS
#endif

#ifndef EXTRA_SECTIONS
#define EXTRA_SECTIONS SUBTARGET_EXTRA_SECTIONS in_ctors, in_dtors
#endif

/* A list of extra section function definitions.  */
#ifndef SUBTARGET_EXTRA_SECTION_FUNCTIONS
#define SUBTARGET_EXTRA_SECTION_FUNCTIONS
#endif

#ifndef EXTRA_SECTION_FUNCTIONS
#define EXTRA_SECTION_FUNCTIONS 		\
  SUBTARGET_EXTRA_SECTION_FUNCTIONS		\
  CTORS_SECTION_FUNCTION			\
  DTORS_SECTION_FUNCTION			
#endif

#ifndef CTORS_SECTION_FUNCTION
#define CTORS_SECTION_FUNCTION 						\
void									\
ctors_section ()							\
{									\
  if (in_section != in_ctors)						\
    {									\
      fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP);		\
      in_section = in_ctors;						\
    }									\
}
#endif

#ifndef DTORS_SECTION_FUNCTION
#define DTORS_SECTION_FUNCTION 						\
void									\
dtors_section ()							\
{									\
  if (in_section != in_dtors)						\
    {									\
      fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP);		\
      in_section = in_dtors;						\
    }									\
}
#endif

/* Support the ctors/dtors sections for g++.  */
#ifndef INT_ASM_OP
#define INT_ASM_OP 	".word"
#endif

/* A C statement (sans semicolon) to output an element in the table of
   global constructors.  */
#ifndef ASM_OUTPUT_CONSTRUCTOR
#define ASM_OUTPUT_CONSTRUCTOR(STREAM,NAME) \
do {						\
  ctors_section ();				\
  fprintf (STREAM, "\t%s\t ", INT_ASM_OP);	\
  assemble_name (STREAM, NAME);			\
  fprintf (STREAM, "\n");			\
} while (0)
#endif
     
/* A C statement (sans semicolon) to output an element in the table of
   global destructors.  */
#ifndef ASM_OUTPUT_DESTRUCTOR
#define ASM_OUTPUT_DESTRUCTOR(STREAM,NAME) \
do {						\
  dtors_section ();                   		\
  fprintf (STREAM, "\t%s\t ", INT_ASM_OP);	\
  assemble_name (STREAM, NAME);              	\
  fprintf (STREAM, "\n");			\
} while (0)
#endif

/* 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)

/* For PIC code we need to explicitly specify (PLT) and (GOT) relocs.  */
#define NEED_PLT_GOT	flag_pic

/* The ELF assembler handles GOT addressing differently to NetBSD.  */
#define GOT_PCREL	0

/* Biggest alignment supported by the object file format of this
   machine.  Use this macro to limit the alignment which can be
   specified using the `__attribute__ ((aligned (N)))' construct.  If
   not defined, the default value is `BIGGEST_ALIGNMENT'.  */
#define MAX_OFILE_ALIGNMENT (32768*8)

/* Align output to a power of two.  */
#define ASM_OUTPUT_ALIGN(STREAM, POWER)  \
   fprintf (STREAM, "\t.align\t%d\n", POWER)

#include "arm/aout.h"