1 /* Definitions for Intel 386 running Linux-based GNU systems with ELF format. 2 Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2004, 2005, 3 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. 4 Contributed by Eric Youngdale. 5 Modified for stabs-in-ELF by H.J. Lu. 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 3, 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 COPYING3. If not see 21 <http://www.gnu.org/licenses/>. */ 22 23 /* Output at beginning of assembler file. */ 24 /* The .file command should always begin the output. */ 25 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true 26 27 #define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)"); 28 29 /* The svr4 ABI for the i386 says that records and unions are returned 30 in memory. */ 31 #undef DEFAULT_PCC_STRUCT_RETURN 32 #define DEFAULT_PCC_STRUCT_RETURN 1 33 34 /* We arrange for the whole %gs segment to map the tls area. */ 35 #undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT 36 #define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS 37 38 #undef ASM_COMMENT_START 39 #define ASM_COMMENT_START "#" 40 41 #undef DBX_REGISTER_NUMBER 42 #define DBX_REGISTER_NUMBER(n) \ 43 (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n]) 44 45 /* Output assembler code to FILE to call the profiler. 46 To the best of my knowledge, no Linux libc has required the label 47 argument to mcount. */ 48 49 #define NO_PROFILE_COUNTERS 1 50 51 #undef MCOUNT_NAME 52 #define MCOUNT_NAME "mcount" 53 54 /* The GLIBC version of mcount for the x86 assumes that there is a 55 frame, so we cannot allow profiling without a frame pointer. */ 56 57 #undef SUBTARGET_FRAME_POINTER_REQUIRED 58 #define SUBTARGET_FRAME_POINTER_REQUIRED crtl->profile 59 60 #undef SIZE_TYPE 61 #define SIZE_TYPE "unsigned int" 62 63 #undef PTRDIFF_TYPE 64 #define PTRDIFF_TYPE "int" 65 66 #undef WCHAR_TYPE 67 #define WCHAR_TYPE "long int" 68 69 #undef WCHAR_TYPE_SIZE 70 #define WCHAR_TYPE_SIZE BITS_PER_WORD 71 72 #define TARGET_OS_CPP_BUILTINS() \ 73 do \ 74 { \ 75 LINUX_TARGET_OS_CPP_BUILTINS(); \ 76 } \ 77 while (0) 78 79 #undef CPP_SPEC 80 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}" 81 82 #undef CC1_SPEC 83 #define CC1_SPEC "%(cc1_cpu) %{profile:-p}" 84 85 /* Provide a LINK_SPEC appropriate for Linux. Here we provide support 86 for the special GCC options -static and -shared, which allow us to 87 link things in one of these three modes by applying the appropriate 88 combinations of options at link-time. We like to support here for 89 as many of the other GNU linker options as possible. But I don't 90 have the time to search for those flags. I am sure how to add 91 support for -soname shared_object_name. H.J. 92 93 I took out %{v:%{!V:-V}}. It is too much :-(. They can use 94 -Wl,-V. 95 96 When the -shared link option is used a final link is not being 97 done. */ 98 99 /* If ELF is the default format, we should not use /lib/elf. */ 100 101 /* These macros may be overridden in k*bsd-gnu.h and i386/k*bsd-gnu.h. */ 102 #define LINK_EMULATION "elf_i386" 103 #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2" 104 105 #undef ASM_SPEC 106 #define ASM_SPEC \ 107 "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*} --32 \ 108 %{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}" 109 110 #undef SUBTARGET_EXTRA_SPECS 111 #define SUBTARGET_EXTRA_SPECS \ 112 { "link_emulation", LINK_EMULATION },\ 113 { "dynamic_linker", LINUX_DYNAMIC_LINKER } 114 115 #undef LINK_SPEC 116 #define LINK_SPEC "-m %(link_emulation) %{shared:-shared} \ 117 %{!shared: \ 118 %{!ibcs: \ 119 %{!static: \ 120 %{rdynamic:-export-dynamic} \ 121 %{!dynamic-linker:-dynamic-linker %(dynamic_linker)}} \ 122 %{static:-static}}}" 123 124 /* Similar to standard Linux, but adding -ffast-math support. */ 125 #undef ENDFILE_SPEC 126 #define ENDFILE_SPEC \ 127 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ 128 %{mpc32:crtprec32.o%s} \ 129 %{mpc64:crtprec64.o%s} \ 130 %{mpc80:crtprec80.o%s} \ 131 %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s" 132 133 /* A C statement (sans semicolon) to output to the stdio stream 134 FILE the assembler definition of uninitialized global DECL named 135 NAME whose size is SIZE bytes and alignment is ALIGN bytes. 136 Try to use asm_output_aligned_bss to implement this macro. */ 137 138 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 139 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 140 141 /* A C statement to output to the stdio stream FILE an assembler 142 command to advance the location counter to a multiple of 1<<LOG 143 bytes if it is within MAX_SKIP bytes. 144 145 This is used to align code labels according to Intel recommendations. */ 146 147 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 148 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \ 149 do { \ 150 if ((LOG) != 0) { \ 151 if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 152 else { \ 153 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 154 /* Make sure that we have at least 8 byte alignment if > 8 byte \ 155 alignment is preferred. */ \ 156 if ((LOG) > 3 \ 157 && (1 << (LOG)) > ((MAX_SKIP) + 1) \ 158 && (MAX_SKIP) >= 7) \ 159 fputs ("\t.p2align 3\n", (FILE)); \ 160 } \ 161 } \ 162 } while (0) 163 #endif 164 165 /* Handle special EH pointer encodings. Absolute, pc-relative, and 166 indirect are handled automatically. */ 167 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \ 168 do { \ 169 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \ 170 { \ 171 fputs (ASM_LONG, FILE); \ 172 assemble_name (FILE, XSTR (ADDR, 0)); \ 173 fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \ 174 goto DONE; \ 175 } \ 176 } while (0) 177 178 /* Used by crtstuff.c to initialize the base of data-relative relocations. 179 These are GOT relative on x86, so return the pic register. */ 180 #ifdef __PIC__ 181 #define CRT_GET_RFIB_DATA(BASE) \ 182 { \ 183 register void *ebx_ __asm__("ebx"); \ 184 BASE = ebx_; \ 185 } 186 #else 187 #define CRT_GET_RFIB_DATA(BASE) \ 188 __asm__ ("call\t.LPR%=\n" \ 189 ".LPR%=:\n\t" \ 190 "pop{l}\t%0\n\t" \ 191 /* Due to a GAS bug, this cannot use EAX. That encodes \ 192 smaller than the traditional EBX, which results in the \ 193 offset being off by one. */ \ 194 "add{l}\t{$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0" \ 195 "|%0,_GLOBAL_OFFSET_TABLE_+(.-.LPR%=)}" \ 196 : "=d"(BASE)) 197 #endif 198 199 /* Put all *tf routines in libgcc. */ 200 #undef LIBGCC2_HAS_TF_MODE 201 #define LIBGCC2_HAS_TF_MODE 1 202 #define LIBGCC2_TF_CEXT q 203 #define TF_SIZE 113 204 205 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack 206 207 #define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h" 208 209 /* The stack pointer needs to be moved while checking the stack. */ 210 #define STACK_CHECK_MOVING_SP 1 211 212 /* This macro may be overridden in i386/k*bsd-gnu.h. */ 213 #define REG_NAME(reg) reg 214 215 #ifdef TARGET_LIBC_PROVIDES_SSP 216 /* i386 glibc provides __stack_chk_guard in %gs:0x14. */ 217 #define TARGET_THREAD_SSP_OFFSET 0x14 218 #endif 219