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1 /* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
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2 Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2004, 2005,
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3 2006, 2007, 2008 Free Software Foundation, Inc.
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4 Contributed by Eric Youngdale.
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5 Modified for stabs-in-ELF by H.J. Lu.
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6
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7 This file is part of GCC.
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8
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9 GCC is free software; you can redistribute it and/or modify
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10 it under the terms of the GNU General Public License as published by
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11 the Free Software Foundation; either version 3, or (at your option)
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12 any later version.
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13
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14 GCC is distributed in the hope that it will be useful,
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15 but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 GNU General Public License for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with GCC; see the file COPYING3. If not see
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21 <http://www.gnu.org/licenses/>. */
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22
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23 /* Output at beginning of assembler file. */
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24 /* The .file command should always begin the output. */
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25 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
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26
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27 #define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
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28
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29 /* The svr4 ABI for the i386 says that records and unions are returned
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30 in memory. */
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31 #undef DEFAULT_PCC_STRUCT_RETURN
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32 #define DEFAULT_PCC_STRUCT_RETURN 1
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33
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34 /* We arrange for the whole %gs segment to map the tls area. */
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35 #undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
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36 #define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS
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37
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38 #undef ASM_COMMENT_START
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39 #define ASM_COMMENT_START "#"
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40
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41 #undef DBX_REGISTER_NUMBER
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42 #define DBX_REGISTER_NUMBER(n) \
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43 (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
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44
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45 /* Output assembler code to FILE to call the profiler.
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46 To the best of my knowledge, no Linux libc has required the label
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47 argument to mcount. */
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48
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49 #define NO_PROFILE_COUNTERS 1
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50
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51 #undef MCOUNT_NAME
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52 #define MCOUNT_NAME "mcount"
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53
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54 /* The GLIBC version of mcount for the x86 assumes that there is a
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55 frame, so we cannot allow profiling without a frame pointer. */
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56
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57 #undef SUBTARGET_FRAME_POINTER_REQUIRED
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58 #define SUBTARGET_FRAME_POINTER_REQUIRED crtl->profile
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59
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60 #undef SIZE_TYPE
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61 #define SIZE_TYPE "unsigned int"
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62
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63 #undef PTRDIFF_TYPE
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64 #define PTRDIFF_TYPE "int"
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65
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66 #undef WCHAR_TYPE
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67 #define WCHAR_TYPE "long int"
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68
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69 #undef WCHAR_TYPE_SIZE
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70 #define WCHAR_TYPE_SIZE BITS_PER_WORD
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71
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72 #define TARGET_OS_CPP_BUILTINS() \
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73 do \
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74 { \
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75 LINUX_TARGET_OS_CPP_BUILTINS(); \
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76 } \
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77 while (0)
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78
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79 #undef CPP_SPEC
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80 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
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81
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82 #undef CC1_SPEC
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83 #define CC1_SPEC "%(cc1_cpu) %{profile:-p}"
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84
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85 /* Provide a LINK_SPEC appropriate for Linux. Here we provide support
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86 for the special GCC options -static and -shared, which allow us to
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87 link things in one of these three modes by applying the appropriate
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88 combinations of options at link-time. We like to support here for
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89 as many of the other GNU linker options as possible. But I don't
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90 have the time to search for those flags. I am sure how to add
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91 support for -soname shared_object_name. H.J.
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92
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93 I took out %{v:%{!V:-V}}. It is too much :-(. They can use
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94 -Wl,-V.
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95
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96 When the -shared link option is used a final link is not being
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97 done. */
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98
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99 /* If ELF is the default format, we should not use /lib/elf. */
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100
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101 /* These macros may be overridden in k*bsd-gnu.h and i386/k*bsd-gnu.h. */
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102 #define LINK_EMULATION "elf_i386"
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103 #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
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104
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105 #undef ASM_SPEC
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106 #define ASM_SPEC \
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107 "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*} \
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108 %{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}"
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109
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110 #undef SUBTARGET_EXTRA_SPECS
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111 #define SUBTARGET_EXTRA_SPECS \
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112 { "link_emulation", LINK_EMULATION },\
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113 { "dynamic_linker", LINUX_DYNAMIC_LINKER }
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114
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115 #undef LINK_SPEC
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116 #define LINK_SPEC "-m %(link_emulation) %{shared:-shared} \
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117 %{!shared: \
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118 %{!ibcs: \
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119 %{!static: \
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120 %{rdynamic:-export-dynamic} \
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121 %{!dynamic-linker:-dynamic-linker %(dynamic_linker)}} \
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122 %{static:-static}}}"
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123
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124 /* Similar to standard Linux, but adding -ffast-math support. */
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125 #undef ENDFILE_SPEC
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126 #define ENDFILE_SPEC \
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127 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
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128 %{mpc32:crtprec32.o%s} \
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129 %{mpc64:crtprec64.o%s} \
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130 %{mpc80:crtprec80.o%s} \
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131 %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
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132
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133 /* A C statement (sans semicolon) to output to the stdio stream
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134 FILE the assembler definition of uninitialized global DECL named
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135 NAME whose size is SIZE bytes and alignment is ALIGN bytes.
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136 Try to use asm_output_aligned_bss to implement this macro. */
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137
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138 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
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139 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
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140
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141 /* A C statement to output to the stdio stream FILE an assembler
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142 command to advance the location counter to a multiple of 1<<LOG
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143 bytes if it is within MAX_SKIP bytes.
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144
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145 This is used to align code labels according to Intel recommendations. */
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146
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147 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
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148 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
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149 do { \
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150 if ((LOG) != 0) { \
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151 if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
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152 else { \
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153 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
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154 /* Make sure that we have at least 8 byte alignment if > 8 byte \
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155 alignment is preferred. */ \
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156 if ((LOG) > 3 && (1 << (LOG)) > ((MAX_SKIP) + 1)) \
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157 fprintf ((FILE), "\t.p2align 3\n"); \
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158 } \
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159 } \
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160 } while (0)
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161 #endif
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162
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163 /* Handle special EH pointer encodings. Absolute, pc-relative, and
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164 indirect are handled automatically. */
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165 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
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166 do { \
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167 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \
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168 { \
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169 fputs (ASM_LONG, FILE); \
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170 assemble_name (FILE, XSTR (ADDR, 0)); \
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171 fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
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172 goto DONE; \
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173 } \
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174 } while (0)
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175
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176 /* Used by crtstuff.c to initialize the base of data-relative relocations.
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177 These are GOT relative on x86, so return the pic register. */
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178 #ifdef __PIC__
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179 #define CRT_GET_RFIB_DATA(BASE) \
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180 { \
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181 register void *ebx_ __asm__("ebx"); \
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182 BASE = ebx_; \
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183 }
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184 #else
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185 #define CRT_GET_RFIB_DATA(BASE) \
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186 __asm__ ("call\t.LPR%=\n" \
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187 ".LPR%=:\n\t" \
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188 "pop{l}\t%0\n\t" \
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189 /* Due to a GAS bug, this cannot use EAX. That encodes \
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190 smaller than the traditional EBX, which results in the \
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191 offset being off by one. */ \
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192 "add{l}\t{$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0" \
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193 "|%0,_GLOBAL_OFFSET_TABLE_+(.-.LPR%=)}" \
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194 : "=d"(BASE))
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195 #endif
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196
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197 /* Put all *tf routines in libgcc. */
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198 #undef LIBGCC2_HAS_TF_MODE
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199 #define LIBGCC2_HAS_TF_MODE 1
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200 #define LIBGCC2_TF_CEXT q
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201 #define TF_SIZE 113
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202
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203 #undef NEED_INDICATE_EXEC_STACK
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204 #define NEED_INDICATE_EXEC_STACK 1
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205
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206 #define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
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207
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208 /* This macro may be overridden in i386/k*bsd-gnu.h. */
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209 #define REG_NAME(reg) reg
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210
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211 #ifdef TARGET_LIBC_PROVIDES_SSP
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212 /* i386 glibc provides __stack_chk_guard in %gs:0x14. */
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213 #define TARGET_THREAD_SSP_OFFSET 0x14
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214 #endif
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