gcc/config/i386/nacl.h

   1 /* Target definitions for GCC for NativeClient using ELF
   2    Copyright (C) 1988, 1991, 1995, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5    Derived from sysv4.h written by Ron Guilmette (rfg@netcom.com).
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 59 Temple Place - Suite 330,
  22 Boston, MA 02111-1307, USA.  */
  23
  24 /* These definitions modify those in i386elf.h. */
  25
  26 #undef TARGET_VERSION
  27 #define TARGET_VERSION fprintf (stderr, " (NativeClient)");
  28
  29 /* Pass the NativeClient specific options to the assembler */
  30 #undef  ASM_SPEC
  31 #define ASM_SPEC \
  32   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} " \
  33   "%{fnacl-library-mode:-nacl-library-mode} " \
  34   "%{fnacl-align-16:-nacl-align=4} " \
  35   "%{fnacl-align-32:-nacl-align=5} " \
  36   "%{Ym,*} %{Yd,*} %{Wa,*:%*}"
  37
  38 #undef  LIB_SPEC
  39 #define LIB_SPEC \
  40   "%{pthread:-lpthread} \
  41    %{shared:-lc} \
  42    %{!shared:%{mieee-fp:-lieee} %{profile:-lc_p}%{!profile:-lc}} -lnacl -lsrpc"
  43
  44 /*
  45  * Set the linker emulation to be elf_nacl rather than linux.h's default
  46  * (elf_i386).
  47  */
  48 #ifdef LINK_EMULATION
  49 #undef LINK_EMULATION
  50 #endif
  51 #define LINK_EMULATION "elf_nacl"
  52
  53 /*
  54  * Because of NaCl's use of segment registers, negative offsets from gs: will
  55  * not work.  Hence we need to make TLS references explicitly compute the
  56  * tls base pointer and then indirect relative to it using the default
  57  * segment descriptor (DS).  That is, instead of
  58  *    movl gs:i@NTPOFF, %ecx
  59  * we use
  60  *   movl %gs:0, %eax
  61  *   movl i@NTPOFF(%eax), %ecx
  62  * There is a slight performance penalty for TLS accesses, but there does not
  63  * seem a way around it.
  64  */
  65 #undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
  66 #define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT 0
  67
  68 #undef TARGET_OS_CPP_BUILTINS
  69 #define TARGET_OS_CPP_BUILTINS()                        \
  70   do                                                    \
  71     {                                                   \
  72         LINUX_TARGET_OS_CPP_BUILTINS();                 \
  73         builtin_define ("__native_client__=1");         \
  74   }                                                     \
  75   while (0)