1 | /* Definitions for Motorola 68k running Linux with ELF format. |
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2 | Copyright (C) 1995 Free Software Foundation, Inc. |
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3 | |
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4 | This file is part of GNU CC. |
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5 | |
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6 | GNU CC is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 1, or (at your option) |
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9 | any later version. |
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10 | |
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11 | GNU CC is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU General Public License |
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17 | along with GNU CC; see the file COPYING. If not, write to |
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18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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19 | Boston, MA 02111-1307, USA. */ |
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20 | |
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21 | #define LINUX_DEFAULT_ELF |
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22 | #define MOTOROLA /* Use Motorola syntax */ |
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23 | #define USE_GAS /* But GAS wants jbsr instead of jsr */ |
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24 | |
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25 | #include <m68k/m68k.h> |
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26 | #include <linux.h> /* some common stuff */ |
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27 | |
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28 | #undef TARGET_VERSION |
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29 | #define TARGET_VERSION fprintf (stderr, " (68k Linux/ELF)"); |
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30 | |
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31 | /* 68020 with 68881 */ |
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32 | #define TARGET_DEFAULT 7 |
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33 | |
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34 | #undef SUBTARGET_SWITCHES |
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35 | #define SUBTARGET_SWITCHES {"ieee-fp", 0}, |
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36 | |
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37 | /* Here are four prefixes that are used by asm_fprintf to |
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38 | facilitate customization for alternate assembler syntaxes. |
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39 | Machines with no likelihood of an alternate syntax need not |
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40 | define these and need not use asm_fprintf. */ |
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41 | |
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42 | /* The prefix for register names. Note that REGISTER_NAMES |
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43 | is supposed to include this prefix. Also note that this is NOT an |
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44 | fprintf format string, it is a literal string */ |
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45 | |
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46 | #undef REGISTER_PREFIX |
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47 | #define REGISTER_PREFIX "%" |
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48 | |
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49 | /* The prefix for local (compiler generated) labels. |
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50 | These labels will not appear in the symbol table. */ |
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51 | |
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52 | #undef LOCAL_LABEL_PREFIX |
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53 | #define LOCAL_LABEL_PREFIX "." |
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54 | |
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55 | /* The prefix to add to user-visible assembler symbols. */ |
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56 | |
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57 | #undef USER_LABEL_PREFIX |
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58 | #define USER_LABEL_PREFIX "" |
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59 | |
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60 | /* How to refer to registers in assembler output. |
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61 | This sequence is indexed by compiler's hard-register-number. |
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62 | Motorola format uses different register names than defined in m68k.h. */ |
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63 | |
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64 | #undef REGISTER_NAMES |
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65 | |
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66 | #ifndef SUPPORT_SUN_FPA |
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67 | |
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68 | #define REGISTER_NAMES \ |
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69 | {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \ |
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70 | "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp", \ |
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71 | "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7" } |
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72 | |
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73 | #else /* SUPPORTED_SUN_FPA */ |
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74 | |
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75 | #define REGISTER_NAMES \ |
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76 | {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \ |
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77 | "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp", \ |
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78 | "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7", \ |
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79 | "%fpa0", "%fpa1", "%fpa2", "%fpa3", "%fpa4", "%fpa5", "%fpa6", "%fpa7", \ |
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80 | "%fpa8", "%fpa9", "%fpa10","%fpa11","%fpa12","%fpa13","%fpa14","%fpa15", \ |
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81 | "%fpa16","%fpa17","%fpa18","%fpa19","%fpa20","%fpa21","%fpa22","%fpa23", \ |
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82 | "%fpa24","%fpa25","%fpa26","%fpa27","%fpa28","%fpa29","%fpa30","%fpa31" } |
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83 | |
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84 | #endif /* defined SUPPORT_SUN_FPA */ |
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85 | |
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86 | #undef SIZE_TYPE |
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87 | #define SIZE_TYPE "unsigned int" |
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88 | |
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89 | #undef PTRDIFF_TYPE |
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90 | #define PTRDIFF_TYPE "int" |
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91 | |
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92 | #undef WCHAR_TYPE |
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93 | #define WCHAR_TYPE "long int" |
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94 | |
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95 | #undef WCHAR_TYPE_SIZE |
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96 | #define WCHAR_TYPE_SIZE BITS_PER_WORD |
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97 | |
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98 | #undef ASM_SPEC |
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99 | #define ASM_SPEC "%{m68030} %{m68040} %{fpic:-k} %{fPIC:-k}" |
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100 | |
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101 | #define CPP_PREDEFINES \ |
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102 | "-D__ELF__ -Dunix -Dmc68000 -Dmc68020 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(m68k) -Amachine(m68k)" |
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103 | |
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104 | #undef CPP_SPEC |
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105 | #if TARGET_DEFAULT & 2 |
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106 | #define CPP_SPEC \ |
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107 | "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!msoft-float:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE}" |
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108 | #else |
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109 | #define CPP_SPEC \ |
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110 | "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m68881:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE}" |
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111 | #endif |
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112 | |
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113 | #undef LIB_SPEC |
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114 | #if 1 |
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115 | /* We no longer link with libc_p.a or libg.a by default. If you want |
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116 | to profile or debug the Linux C library, please add -lc_p or -ggdb |
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117 | to LDFLAGS at the link time, respectively. */ |
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118 | #define LIB_SPEC \ |
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119 | "%{!shared:%{!symbolic: %{mieee-fp:-lieee} %{p:-lgmon} %{pg:-lgmon} \ |
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120 | %{!ggdb:-lc} %{ggdb:-lg}}}" |
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121 | #else |
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122 | #define LIB_SPEC \ |
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123 | "%{!shared:%{!symbolic: \ |
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124 | %{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \ |
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125 | %{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}}" |
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126 | #endif |
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127 | |
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128 | /* Provide a LINK_SPEC appropriate for Linux. Here we provide support |
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129 | for the special GCC options -static and -shared, which allow us to |
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130 | link things in one of these three modes by applying the appropriate |
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131 | combinations of options at link-time. We like to support here for |
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132 | as many of the other GNU linker options as possible. But I don't |
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133 | have the time to search for those flags. I am sure how to add |
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134 | support for -soname shared_object_name. H.J. |
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135 | |
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136 | I took out %{v:%{!V:-V}}. It is too much :-(. They can use |
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137 | -Wl,-V. |
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138 | |
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139 | When the -shared link option is used a final link is not being |
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140 | done. */ |
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141 | |
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142 | /* If ELF is the default format, we should not use /lib/elf. */ |
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143 | |
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144 | #undef LINK_SPEC |
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145 | #ifndef LINUX_DEFAULT_ELF |
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146 | #define LINK_SPEC "-m m68kelf %{shared} %{symbolic:-shared -Bsymbolic} \ |
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147 | %{!shared:%{!symbolic: \ |
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148 | %{!static: \ |
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149 | %{rdynamic:-export-dynamic} \ |
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150 | %{!dynamic-linker*:-dynamic-linker /lib/elf/ld-linux.so.1} \ |
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151 | %{!rpath*:-rpath /lib/elf/}} %{static}}}" |
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152 | #else |
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153 | #define LINK_SPEC "-m m68kelf %{shared} %{symbolic:-shared -Bsymbolic} \ |
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154 | %{!shared:%{!symbolic: \ |
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155 | %{!static: \ |
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156 | %{rdynamic:-export-dynamic} \ |
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157 | %{!dynamic-linker*:-dynamic-linker /lib/ld-linux.so.1}} \ |
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158 | %{static}}}" |
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159 | #endif |
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160 | |
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161 | /* For compatibility with linux/a.out */ |
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162 | |
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163 | #undef PCC_BITFIELD_TYPE_MATTERS |
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164 | |
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165 | /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to |
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166 | keep switch tables in the text section. */ |
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167 | |
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168 | #define JUMP_TABLES_IN_TEXT_SECTION 1 |
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169 | |
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170 | /* Use the default action for outputting the case label. */ |
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171 | #undef ASM_OUTPUT_CASE_LABEL |
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172 | |
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173 | #define ASM_RETURN_CASE_JUMP \ |
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174 | return "jmp (2,%%pc,%0.w)" |
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175 | |
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176 | /* This is how to output an assembler line that says to advance the |
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177 | location counter to a multiple of 2**LOG bytes. */ |
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178 | |
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179 | #undef ASM_OUTPUT_ALIGN |
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180 | #define ASM_OUTPUT_ALIGN(FILE,LOG) \ |
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181 | if ((LOG) > 0) \ |
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182 | fprintf ((FILE), "\t%s \t%u\n", ALIGN_ASM_OP, 1 << (LOG)); |
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183 | |
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184 | /* Output assembler code to FILE to increment profiler label # LABELNO |
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185 | for profiling a function entry. */ |
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186 | |
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187 | #undef FUNCTION_PROFILER |
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188 | #define FUNCTION_PROFILER(FILE, LABELNO) \ |
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189 | { \ |
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190 | asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \ |
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191 | if (flag_pic) \ |
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192 | fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \ |
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193 | else \ |
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194 | fprintf (FILE, "\tjbsr _mcount\n"); \ |
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195 | } |
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196 | |
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197 | /* How to renumber registers for dbx and gdb. |
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198 | On the Sun-3, the floating point registers have numbers |
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199 | 18 to 25, not 16 to 23 as they do in the compiler. */ |
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200 | |
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201 | #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2) |
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202 | |
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203 | /* Do not break .stabs pseudos into continuations. */ |
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204 | |
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205 | #define DBX_CONTIN_LENGTH 0 |
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206 | |
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207 | /* Allow folding division by zero. */ |
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208 | #define REAL_INFINITY |
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209 | |
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210 | /* 1 if N is a possible register number for a function value. For |
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211 | m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral, |
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212 | pointer, or floating types, respectively. Reject fp0 if not using |
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213 | a 68881 coprocessor. */ |
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214 | |
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215 | #undef FUNCTION_VALUE_REGNO_P |
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216 | #define FUNCTION_VALUE_REGNO_P(N) \ |
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217 | ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16)) |
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218 | |
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219 | /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for |
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220 | more than one register. */ |
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221 | |
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222 | #undef NEEDS_UNTYPED_CALL |
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223 | #define NEEDS_UNTYPED_CALL 1 |
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224 | |
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225 | /* Define how to generate (in the callee) the output value of a |
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226 | function and how to find (in the caller) the value returned by a |
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227 | function. VALTYPE is the data type of the value (as a tree). If |
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228 | the precise function being called is known, FUNC is its |
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229 | FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the |
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230 | result in d0, a0, or fp0 as appropriate. */ |
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231 | |
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232 | #undef FUNCTION_VALUE |
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233 | #define FUNCTION_VALUE(VALTYPE, FUNC) \ |
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234 | (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881 \ |
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235 | ? gen_rtx (REG, TYPE_MODE (VALTYPE), 16) \ |
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236 | : (POINTER_TYPE_P (VALTYPE) \ |
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237 | ? gen_rtx (REG, TYPE_MODE (VALTYPE), 8) \ |
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238 | : gen_rtx (REG, TYPE_MODE (VALTYPE), 0))) |
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239 | |
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240 | /* For compatibility with the large body of existing code which does |
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241 | not always properly declare external functions returning pointer |
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242 | types, the m68k/SVR4 convention is to copy the value returned for |
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243 | pointer functions from a0 to d0 in the function epilogue, so that |
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244 | callers that have neglected to properly declare the callee can |
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245 | still find the correct return value. */ |
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246 | |
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247 | extern int current_function_returns_pointer; |
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248 | #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \ |
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249 | do { \ |
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250 | if ((current_function_returns_pointer) && \ |
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251 | ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \ |
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252 | asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n"); \ |
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253 | } while (0); |
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254 | |
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255 | /* Define how to find the value returned by a library function |
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256 | assuming the value has mode MODE. |
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257 | For m68k/SVR4 look for integer values in d0, pointer values in d0 |
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258 | (returned in both d0 and a0), and floating values in fp0. */ |
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259 | |
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260 | #undef LIBCALL_VALUE |
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261 | #define LIBCALL_VALUE(MODE) \ |
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262 | (((MODE) == SFmode || (MODE) == DFmode) && TARGET_68881 \ |
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263 | ? gen_rtx (REG, (MODE), 16) \ |
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264 | : gen_rtx (REG, (MODE), 0)) |
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265 | |
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266 | /* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is |
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267 | an operand of a function call. */ |
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268 | #undef LEGITIMATE_PIC_OPERAND_P |
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269 | #define LEGITIMATE_PIC_OPERAND_P(X) \ |
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270 | (! symbolic_operand (X, VOIDmode) \ |
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271 | || (GET_CODE (X) == SYMBOL_REF && SYMBOL_REF_FLAG (X))) |
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272 | |
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273 | /* Turn off function cse if we are doing PIC. We always want function |
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274 | call to be done as `bsr foo@PLTPC', so it will force the assembler |
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275 | to create the PLT entry for `foo'. Doing function cse will cause |
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276 | the address of `foo' to be loaded into a register, which is exactly |
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277 | what we want to avoid when we are doing PIC on svr4 m68k. */ |
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278 | #undef SUBTARGET_OVERRIDE_OPTIONS |
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279 | #define SUBTARGET_OVERRIDE_OPTIONS \ |
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280 | if (flag_pic) flag_no_function_cse = 1; |
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281 | |
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282 | /* For m68k SVR4, structures are returned using the reentrant |
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283 | technique. */ |
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284 | #undef PCC_STATIC_STRUCT_RETURN |
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285 | #define DEFAULT_PCC_STRUCT_RETURN 0 |
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