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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [i386/] [linux.h] - Blame information for rev 282

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1 282 jeremybenn
/* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
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   Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2004, 2005,
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   2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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   Contributed by Eric Youngdale.
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   Modified for stabs-in-ELF by H.J. Lu.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
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/* Output at beginning of assembler file.  */
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/* The .file command should always begin the output.  */
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#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
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#define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
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/* The svr4 ABI for the i386 says that records and unions are returned
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   in memory.  */
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#undef DEFAULT_PCC_STRUCT_RETURN
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#define DEFAULT_PCC_STRUCT_RETURN 1
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/* We arrange for the whole %gs segment to map the tls area.  */
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#undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
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#define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS
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#undef ASM_COMMENT_START
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#define ASM_COMMENT_START "#"
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#undef DBX_REGISTER_NUMBER
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#define DBX_REGISTER_NUMBER(n) \
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  (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
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/* Output assembler code to FILE to call the profiler.
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   To the best of my knowledge, no Linux libc has required the label
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   argument to mcount.  */
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#define NO_PROFILE_COUNTERS     1
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#undef MCOUNT_NAME
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#define MCOUNT_NAME "mcount"
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/* The GLIBC version of mcount for the x86 assumes that there is a
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   frame, so we cannot allow profiling without a frame pointer.  */
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#undef SUBTARGET_FRAME_POINTER_REQUIRED
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#define SUBTARGET_FRAME_POINTER_REQUIRED crtl->profile
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#undef SIZE_TYPE
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#define SIZE_TYPE "unsigned int"
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#undef PTRDIFF_TYPE
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#define PTRDIFF_TYPE "int"
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#undef WCHAR_TYPE
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#define WCHAR_TYPE "long int"
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#undef WCHAR_TYPE_SIZE
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#define WCHAR_TYPE_SIZE BITS_PER_WORD
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#define TARGET_OS_CPP_BUILTINS()                \
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  do                                            \
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    {                                           \
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        LINUX_TARGET_OS_CPP_BUILTINS();         \
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    }                                           \
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  while (0)
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#undef CPP_SPEC
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#define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
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#undef CC1_SPEC
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#define CC1_SPEC "%(cc1_cpu) %{profile:-p}"
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/* Provide a LINK_SPEC appropriate for Linux.  Here we provide support
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   for the special GCC options -static and -shared, which allow us to
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   link things in one of these three modes by applying the appropriate
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   combinations of options at link-time. We like to support here for
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   as many of the other GNU linker options as possible. But I don't
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   have the time to search for those flags. I am sure how to add
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   support for -soname shared_object_name. H.J.
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   I took out %{v:%{!V:-V}}. It is too much :-(. They can use
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   -Wl,-V.
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   When the -shared link option is used a final link is not being
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   done.  */
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/* If ELF is the default format, we should not use /lib/elf.  */
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/* These macros may be overridden in k*bsd-gnu.h and i386/k*bsd-gnu.h. */
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#define LINK_EMULATION "elf_i386"
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#define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
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#undef  ASM_SPEC
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#define ASM_SPEC \
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  "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*} --32 \
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  %{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}"
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#undef  SUBTARGET_EXTRA_SPECS
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#define SUBTARGET_EXTRA_SPECS \
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  { "link_emulation", LINK_EMULATION },\
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  { "dynamic_linker", LINUX_DYNAMIC_LINKER }
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#undef  LINK_SPEC
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#define LINK_SPEC "-m %(link_emulation) %{shared:-shared} \
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  %{!shared: \
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    %{!ibcs: \
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      %{!static: \
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        %{rdynamic:-export-dynamic} \
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        %{!dynamic-linker:-dynamic-linker %(dynamic_linker)}} \
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        %{static:-static}}}"
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/* Similar to standard Linux, but adding -ffast-math support.  */
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#undef  ENDFILE_SPEC
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#define ENDFILE_SPEC \
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  "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
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   %{mpc32:crtprec32.o%s} \
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   %{mpc64:crtprec64.o%s} \
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   %{mpc80:crtprec80.o%s} \
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   %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
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/* A C statement (sans semicolon) to output to the stdio stream
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   FILE the assembler definition of uninitialized global DECL named
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   NAME whose size is SIZE bytes and alignment is ALIGN bytes.
136
   Try to use asm_output_aligned_bss to implement this macro.  */
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138
#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
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  asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
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141
/* A C statement to output to the stdio stream FILE an assembler
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   command to advance the location counter to a multiple of 1<<LOG
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   bytes if it is within MAX_SKIP bytes.
144
 
145
   This is used to align code labels according to Intel recommendations.  */
146
 
147
#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
148
#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)                    \
149
  do {                                                                  \
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    if ((LOG) != 0) {                                                   \
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      if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG));  \
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      else {                                                            \
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        fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP));     \
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        /* Make sure that we have at least 8 byte alignment if > 8 byte \
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           alignment is preferred.  */                                  \
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        if ((LOG) > 3                                                   \
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            && (1 << (LOG)) > ((MAX_SKIP) + 1)                          \
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            && (MAX_SKIP) >= 7)                                         \
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          fputs ("\t.p2align 3\n", (FILE));                             \
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      }                                                                 \
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    }                                                                   \
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  } while (0)
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#endif
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/* Handle special EH pointer encodings.  Absolute, pc-relative, and
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   indirect are handled automatically.  */
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#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
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  do {                                                                  \
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    if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel)         \
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      {                                                                 \
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        fputs (ASM_LONG, FILE);                 \
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        assemble_name (FILE, XSTR (ADDR, 0));                           \
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        fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
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        goto DONE;                                                      \
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      }                                                                 \
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  } while (0)
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/* Used by crtstuff.c to initialize the base of data-relative relocations.
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   These are GOT relative on x86, so return the pic register.  */
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#ifdef __PIC__
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#define CRT_GET_RFIB_DATA(BASE)                 \
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  {                                             \
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    register void *ebx_ __asm__("ebx");         \
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    BASE = ebx_;                                \
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  }
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#else
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#define CRT_GET_RFIB_DATA(BASE)                                         \
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  __asm__ ("call\t.LPR%=\n"                                             \
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           ".LPR%=:\n\t"                                                \
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           "pop{l}\t%0\n\t"                                              \
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           /* Due to a GAS bug, this cannot use EAX.  That encodes      \
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              smaller than the traditional EBX, which results in the    \
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              offset being off by one.  */                              \
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           "add{l}\t{$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0"               \
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                   "|%0,_GLOBAL_OFFSET_TABLE_+(.-.LPR%=)}"               \
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           : "=d"(BASE))
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#endif
198
 
199
/* Put all *tf routines in libgcc.  */
200
#undef LIBGCC2_HAS_TF_MODE
201
#define LIBGCC2_HAS_TF_MODE 1
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#define LIBGCC2_TF_CEXT q
203
#define TF_SIZE 113
204
 
205
#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
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207
#define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
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209
/* The stack pointer needs to be moved while checking the stack.  */
210
#define STACK_CHECK_MOVING_SP 1
211
 
212
/* This macro may be overridden in i386/k*bsd-gnu.h.  */
213
#define REG_NAME(reg) reg
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215
#ifdef TARGET_LIBC_PROVIDES_SSP
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/* i386 glibc provides __stack_chk_guard in %gs:0x14.  */
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#define TARGET_THREAD_SSP_OFFSET        0x14
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#endif

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