1 /* Definitions of target machine for GNU compiler, 2 for PowerPC machines running Linux. 3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 4 2004, 2005, 2006 Free Software Foundation, Inc. 5 Contributed by Michael Meissner (meissner@cygnus.com). 6 7 This file is part of GCC. 8 9 GCC is free software; you can redistribute it and/or modify it 10 under the terms of the GNU General Public License as published 11 by the Free Software Foundation; either version 2, or (at your 12 option) any later version. 13 14 GCC is distributed in the hope that it will be useful, but WITHOUT 15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 17 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 the 21 Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, 22 MA 02110-1301, USA. */ 23 24 #undef MD_EXEC_PREFIX 25 #undef MD_STARTFILE_PREFIX 26 27 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit 28 process. */ 29 #define OS_MISSING_POWERPC64 1 30 31 /* We use glibc _mcount for profiling. */ 32 #define NO_PROFILE_COUNTERS 1 33 34 /* glibc has float and long double forms of math functions. */ 35 #undef TARGET_C99_FUNCTIONS 36 #define TARGET_C99_FUNCTIONS 1 37 38 #undef TARGET_OS_CPP_BUILTINS 39 #define TARGET_OS_CPP_BUILTINS() \ 40 do \ 41 { \ 42 builtin_define_std ("PPC"); \ 43 builtin_define_std ("powerpc"); \ 44 builtin_assert ("cpu=powerpc"); \ 45 builtin_assert ("machine=powerpc"); \ 46 TARGET_OS_SYSV_CPP_BUILTINS (); \ 47 } \ 48 while (0) 49 50 #undef CPP_OS_DEFAULT_SPEC 51 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)" 52 53 /* The GNU C++ standard library currently requires _GNU_SOURCE being 54 defined on glibc-based systems. This temporary hack accomplishes this, 55 it should go away as soon as libstdc++-v3 has a real fix. */ 56 #undef CPLUSPLUS_CPP_SPEC 57 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)" 58 59 #undef LINK_SHLIB_SPEC 60 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}" 61 62 #undef LIB_DEFAULT_SPEC 63 #define LIB_DEFAULT_SPEC "%(lib_linux)" 64 65 #undef STARTFILE_DEFAULT_SPEC 66 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)" 67 68 #undef ENDFILE_DEFAULT_SPEC 69 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)" 70 71 #undef LINK_START_DEFAULT_SPEC 72 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)" 73 74 #undef LINK_OS_DEFAULT_SPEC 75 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)" 76 77 #define LINK_GCC_C_SEQUENCE_SPEC \ 78 "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}" 79 80 /* Use --as-needed -lgcc_s for eh support. */ 81 #ifdef HAVE_LD_AS_NEEDED 82 #define USE_LD_AS_NEEDED 1 83 #endif 84 85 #undef TARGET_VERSION 86 #define TARGET_VERSION fprintf (stderr, " (PowerPC GNU/Linux)"); 87 88 /* Override rs6000.h definition. */ 89 #undef ASM_APP_ON 90 #define ASM_APP_ON "#APP\n" 91 92 /* Override rs6000.h definition. */ 93 #undef ASM_APP_OFF 94 #define ASM_APP_OFF "#NO_APP\n" 95 96 /* For backward compatibility, we must continue to use the AIX 97 structure return convention. */ 98 #undef DRAFT_V4_STRUCT_RET 99 #define DRAFT_V4_STRUCT_RET 1 100 101 /* We are 32-bit all the time, so optimize a little. */ 102 #undef TARGET_64BIT 103 #define TARGET_64BIT 0 104 105 /* We don't need to generate entries in .fixup, except when 106 -mrelocatable or -mrelocatable-lib is given. */ 107 #undef RELOCATABLE_NEEDS_FIXUP 108 #define RELOCATABLE_NEEDS_FIXUP \ 109 (target_flags & target_flags_explicit & MASK_RELOCATABLE) 110 111 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack 112 113 #define TARGET_POSIX_IO 114 115 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h" 116 117 #ifdef TARGET_LIBC_PROVIDES_SSP 118 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2). */ 119 #define TARGET_THREAD_SSP_OFFSET -0x7008 120 #endif 121 122 #define POWERPC_LINUX 123