1/* Definitions for AMD x86-64 running Linux-based GNU systems with ELF format. 2 Copyright (C) 2001, 2002, 2004 Free Software Foundation, Inc. 3 Contributed by Jan Hubicka <jh@suse.cz>, based on linux.h. 4 5This file is part of GCC. 6 7GCC is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GCC is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GCC; see the file COPYING. If not, write to 19the Free Software Foundation, 51 Franklin Street, Fifth Floor, 20Boston, MA 02110-1301, USA. */ 21 22#define TARGET_VERSION fprintf (stderr, " (x86-64 Linux/ELF)"); 23 24#define TARGET_OS_CPP_BUILTINS() \ 25 do \ 26 { \ 27 LINUX_TARGET_OS_CPP_BUILTINS(); \ 28 if (flag_pic) \ 29 { \ 30 builtin_define ("__PIC__"); \ 31 builtin_define ("__pic__"); \ 32 } \ 33 } \ 34 while (0) 35 36#undef CPP_SPEC 37#define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}" 38 39/* The svr4 ABI for the i386 says that records and unions are returned 40 in memory. In the 64bit compilation we will turn this flag off in 41 override_options, as we never do pcc_struct_return scheme on this target. */ 42#undef DEFAULT_PCC_STRUCT_RETURN 43#define DEFAULT_PCC_STRUCT_RETURN 1 44 45/* We arrange for the whole %fs segment to map the tls area. */ 46#undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT 47#define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS 48 49/* Provide a LINK_SPEC. Here we provide support for the special GCC 50 options -static and -shared, which allow us to link things in one 51 of these three modes by applying the appropriate combinations of 52 options at link-time. 53 54 When the -shared link option is used a final link is not being 55 done. */ 56 57#undef LINK_SPEC 58#define LINK_SPEC "%{!m32:-m elf_x86_64} %{m32:-m elf_i386} \ 59 %{shared:-shared} \ 60 %{!shared: \ 61 %{!static: \ 62 %{rdynamic:-export-dynamic} \ 63 %{m32:%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \ 64 %{!m32:%{!dynamic-linker:-dynamic-linker /lib64/ld-linux-x86-64.so.2}}} \ 65 %{static:-static}}" 66 67/* Similar to standard Linux, but adding -ffast-math support. */ 68#undef ENDFILE_SPEC 69#define ENDFILE_SPEC \ 70 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ 71 %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s" 72 73#define MULTILIB_DEFAULTS { "m64" } 74 75#undef NEED_INDICATE_EXEC_STACK 76#define NEED_INDICATE_EXEC_STACK 1 77 78#define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h" 79 80/* This macro may be overridden in i386/k*bsd-gnu.h. */ 81#define REG_NAME(reg) reg 82 83#ifdef TARGET_LIBC_PROVIDES_SSP 84/* i386 glibc provides __stack_chk_guard in %gs:0x14, 85 x86_64 glibc provides it in %fs:0x28. */ 86#define TARGET_THREAD_SSP_OFFSET (TARGET_64BIT ? 0x28 : 0x14) 87#endif 88