1/* Definitions for AMD x86-64 running Linux-based GNU systems with ELF format. 2 Copyright (C) 2001, 2002, 2004, 2005, 2006 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 } \ 29 while (0) 30 31#undef CPP_SPEC 32#define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}" 33 34/* The svr4 ABI for the i386 says that records and unions are returned 35 in memory. In the 64bit compilation we will turn this flag off in 36 override_options, as we never do pcc_struct_return scheme on this target. */ 37#undef DEFAULT_PCC_STRUCT_RETURN 38#define DEFAULT_PCC_STRUCT_RETURN 1 39 40/* We arrange for the whole %fs segment to map the tls area. */ 41#undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT 42#define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS 43 44/* Provide a LINK_SPEC. Here we provide support for the special GCC 45 options -static and -shared, which allow us to link things in one 46 of these three modes by applying the appropriate combinations of 47 options at link-time. 48 49 When the -shared link option is used a final link is not being 50 done. */ 51 52#define GLIBC_DYNAMIC_LINKER32 "/lib/ld-linux.so.2" 53#define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux-x86-64.so.2" 54 55#undef LINK_SPEC 56#define LINK_SPEC "%{!m32:-m elf_x86_64} %{m32:-m elf_i386} \ 57 %{shared:-shared} \ 58 %{!shared: \ 59 %{!static: \ 60 %{rdynamic:-export-dynamic} \ 61 %{m32:%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER32 "}} \ 62 %{!m32:%{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER64 "}}} \ 63 %{static:-static}}" 64 65/* Similar to standard Linux, but adding -ffast-math support. */ 66#undef ENDFILE_SPEC 67#define ENDFILE_SPEC \ 68 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ 69 %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s" 70 71#define MULTILIB_DEFAULTS { "m64" } 72 73#undef NEED_INDICATE_EXEC_STACK 74#define NEED_INDICATE_EXEC_STACK 1 75 76#define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h" 77 78/* This macro may be overridden in i386/k*bsd-gnu.h. */ 79#define REG_NAME(reg) reg 80 81#ifdef TARGET_LIBC_PROVIDES_SSP 82/* i386 glibc provides __stack_chk_guard in %gs:0x14, 83 x86_64 glibc provides it in %fs:0x28. */ 84#define TARGET_THREAD_SSP_OFFSET (TARGET_64BIT ? 0x28 : 0x14) 85#endif 86