aout.h

linux下的gcc编译器

/* Definitions of target machine for GNU compiler, for ARM with a.out
   Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000
   Free Software Foundation, Inc.
   Contributed by Richard Earnshaw ([e-mail]).
   
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.  */

#ifndef ARM_OS_NAME
#define ARM_OS_NAME "(generic)"
#endif

/* The text to go at the start of the assembler file */
#ifndef ASM_FILE_START
#define ASM_FILE_START(STREAM)		    \
{					    \
  asm_fprintf (STREAM,"%Rrfp\t.req\t%Rr9\n"); \
  asm_fprintf (STREAM,"%Rsl\t.req\t%Rr10\n"); \
  asm_fprintf (STREAM,"%Rfp\t.req\t%Rr11\n"); \
  asm_fprintf (STREAM,"%Rip\t.req\t%Rr12\n"); \
  asm_fprintf (STREAM,"%Rsp\t.req\t%Rr13\n"); \
  asm_fprintf (STREAM,"%Rlr\t.req\t%Rr14\n"); \
  asm_fprintf (STREAM,"%Rpc\t.req\t%Rr15\n"); \
}
#endif

#ifndef ASM_APP_ON
#define ASM_APP_ON  		""
#endif
#ifndef ASM_APP_OFF
#define ASM_APP_OFF  		""
#endif

/* Switch to the text or data segment.  */
#define TEXT_SECTION_ASM_OP  	"\t.text"
#define DATA_SECTION_ASM_OP  	"\t.data"
#define BSS_SECTION_ASM_OP   	"\t.bss"

/* Note: If USER_LABEL_PREFIX or LOCAL_LABEL_PREFIX are changed,
   make sure that this change is reflected in the function
   coff_arm_is_local_label_name() in bfd/coff-arm.c  */
#ifndef REGISTER_PREFIX
#define REGISTER_PREFIX 	""
#endif

#ifndef USER_LABEL_PREFIX
#define USER_LABEL_PREFIX 	"_"
#endif

#ifndef LOCAL_LABEL_PREFIX
#define LOCAL_LABEL_PREFIX 	""
#endif


/* The assembler's names for the registers.  */
#ifndef REGISTER_NAMES
#define REGISTER_NAMES  			   \
{				                   \
  "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",  \
  "r8", "r9", "sl", "fp", "ip", "sp", "lr", "pc",  \
  "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",  \
  "cc", "sfp", "afp"		   		   \
}
#endif

#ifndef ADDITIONAL_REGISTER_NAMES
#define ADDITIONAL_REGISTER_NAMES		\
{						\
  {"a1", 0},					\
  {"a2", 1},					\
  {"a3", 2},					\
  {"a4", 3},					\
  {"v1", 4},					\
  {"v2", 5},					\
  {"v3", 6},					\
  {"v4", 7},					\
  {"v5", 8},					\
  {"v6", 9},					\
  {"rfp", 9}, /* Gcc used to call it this */	\
  {"sb", 9},					\
  {"v7", 10},					\
  {"r10", 10},	/* sl */			\
  {"r11", 11},	/* fp */			\
  {"r12", 12},	/* ip */			\
  {"r13", 13},	/* sp */			\
  {"r14", 14},	/* lr */			\
  {"r15", 15}	/* pc */			\
}
#endif

/* Arm Assembler barfs on dollars */
#define DOLLARS_IN_IDENTIFIERS 0

#ifndef NO_DOLLAR_IN_LABEL
#define NO_DOLLAR_IN_LABEL 1
#endif

/* Generate DBX debugging information.  riscix.h will undefine this because
   the native assembler does not support stabs. */
#define DBX_DEBUGGING_INFO 1

/* Acorn dbx moans about continuation chars, so don't use any.  */
#ifndef DBX_CONTIN_LENGTH
#define DBX_CONTIN_LENGTH  0
#endif

/* Output a source filename for the debugger. RISCiX dbx insists that the
   ``desc'' field is set to compiler version number >= 315 (sic).  */
#define DBX_OUTPUT_MAIN_SOURCE_FILENAME(STREAM, NAME)			\
  do									\
    {									\
      fprintf (STREAM, ".stabs ");					\
      output_quoted_string (STREAM, NAME);				\
      fprintf (STREAM, ",%d,0,315,%s\n", N_SO, &ltext_label_name[1]);	\
      text_section ();							\
      ASM_OUTPUT_INTERNAL_LABEL (STREAM, "Ltext", 0);			\
    }									\
  while (0)
  
/* Output a function label definition.  */
#ifndef ASM_DECLARE_FUNCTION_NAME
#define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)	\
  do							\
    {							\
      ARM_DECLARE_FUNCTION_NAME (STREAM, NAME, DECL);   \
      ASM_OUTPUT_LABEL (STREAM, NAME);			\
    }							\
  while (0)
#endif

/* Globalizing directive for a label.  */
#define GLOBAL_ASM_OP "\t.global\t"

/* Make an internal label into a string.  */
#ifndef ASM_GENERATE_INTERNAL_LABEL
#define ASM_GENERATE_INTERNAL_LABEL(STRING, PREFIX, NUM)  \
  sprintf (STRING, "*%s%s%u", LOCAL_LABEL_PREFIX, PREFIX, (unsigned int)(NUM))
#endif
     
/* Construct a private name.  */
#define ASM_FORMAT_PRIVATE_NAME(OUTVAR, NAME, NUMBER)  \
  ((OUTVAR) = (char *) alloca (strlen (NAME) + 10),  \
   sprintf (OUTVAR, "%s.%d", NAME, NUMBER))

/* Output an element of a dispatch table.  */
#define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE)  \
  asm_fprintf (STREAM, "\t.word\t%LL%d\n", VALUE)

#define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL)		\
  do									\
    {									\
      if (TARGET_ARM)							\
	asm_fprintf (STREAM, "\tb\t%LL%d\n", VALUE);			\
      else								\
	asm_fprintf (STREAM, "\t.word\t%LL%d-%LL%d\n", VALUE, REL);	\
    }									\
  while (0)


#undef  ASM_OUTPUT_ASCII
#define ASM_OUTPUT_ASCII(STREAM, PTR, LEN)  \
  output_ascii_pseudo_op (STREAM, (const unsigned char *)(PTR), LEN)

/* Output a gap.  In fact we fill it with nulls.  */
#undef  ASM_OUTPUT_SKIP
#define ASM_OUTPUT_SKIP(STREAM, NBYTES) 	\
  fprintf (STREAM, "\t.space\t%d\n", NBYTES)

/* Align output to a power of two.  Horrible /bin/as.  */
#ifndef ASM_OUTPUT_ALIGN  
#define ASM_OUTPUT_ALIGN(STREAM, POWER)			\
  do							\
    {							\
      register int amount = 1 << (POWER);		\
							\
      if (amount == 2)					\
	fprintf (STREAM, "\t.even\n");			\
      else if (amount != 1)				\
	fprintf (STREAM, "\t.align\t%d\n", amount - 4);	\
    }							\
  while (0)
#endif

/* Output a common block */
#ifndef ASM_OUTPUT_COMMON
#define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED)	\
  do							\
    {							\
      fprintf (STREAM, "\t.comm\t");			\
      assemble_name (STREAM, NAME);			\
      asm_fprintf (STREAM, ", %d\t%@ %d\n", 		\
	           ROUNDED, SIZE);			\
    }							\
  while (0)
#endif
     
/* Output a local common block.  /bin/as can't do this, so hack a
   `.space' into the bss segment.  Note that this is *bad* practice,
   which is guaranteed NOT to work since it doesn't define STATIC
   COMMON space but merely STATIC BSS space.  */
#ifndef ASM_OUTPUT_ALIGNED_LOCAL
#define ASM_OUTPUT_ALIGNED_LOCAL(STREAM, NAME, SIZE, ALIGN)		\
  do									\
    {									\
      bss_section ();							\
      ASM_OUTPUT_ALIGN (STREAM, floor_log2 (ALIGN / BITS_PER_UNIT));	\
      ASM_OUTPUT_LABEL (STREAM, NAME);					\
      fprintf (STREAM, "\t.space\t%d\n", SIZE);				\
    }									\
  while (0)
#endif
     
/* Output a zero-initialized block.  */
#ifndef ASM_OUTPUT_ALIGNED_BSS
#define ASM_OUTPUT_ALIGNED_BSS(STREAM, DECL, NAME, SIZE, ALIGN) \
  asm_output_aligned_bss (STREAM, DECL, NAME, SIZE, ALIGN)
#endif
     
/* Output a source line for the debugger.  */
/* #define ASM_OUTPUT_SOURCE_LINE(STREAM,LINE) */

/* Output a #ident directive.  */
#ifndef ASM_OUTPUT_IDENT
#define ASM_OUTPUT_IDENT(STREAM,STRING)  \
  asm_fprintf (STREAM, "%@ - - - ident %s\n", STRING)
#endif
     
#ifndef ASM_COMMENT_START
#define ASM_COMMENT_START 	"@"
#endif

/* This works for GAS and some other assemblers.  */
#define SET_ASM_OP		"\t.set\t"