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 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2, or (at your option) 10 any later version. 11 12 GCC is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING. If not, write to 19 the Free Software Foundation, 51 Franklin Street, Fifth Floor, 20 Boston, 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