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1 /* Definitions for Motorola 68k running Linux-based GNU systems with
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2 ELF format.
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3 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2006,
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4 2007 Free Software Foundation, Inc.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 3, or (at your option)
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11 any later version.
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12
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13 GCC is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 #undef TARGET_VERSION
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23 #define TARGET_VERSION fprintf (stderr, " (68k GNU/Linux with ELF)");
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24
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25 /* Add %(asm_cpu_spec) to the svr4.h definition of ASM_SPEC. */
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26 #undef ASM_SPEC
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27 #define ASM_SPEC "%(asm_cpu_spec) %(asm_pcrel_spec) \
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28 %{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*}"
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29
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30 #undef PREFERRED_STACK_BOUNDARY
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31 #define PREFERRED_STACK_BOUNDARY 32
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32
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33 /* for 68k machines this only needs to be TRUE for the 68000 */
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34
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35 #undef STRICT_ALIGNMENT
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36 #define STRICT_ALIGNMENT 0
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37 #undef M68K_HONOR_TARGET_STRICT_ALIGNMENT
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38 #define M68K_HONOR_TARGET_STRICT_ALIGNMENT 0
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39
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40 /* Here are four prefixes that are used by asm_fprintf to
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41 facilitate customization for alternate assembler syntaxes.
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42 Machines with no likelihood of an alternate syntax need not
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43 define these and need not use asm_fprintf. */
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44
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45 /* The prefix for register names. Note that REGISTER_NAMES
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46 is supposed to include this prefix. Also note that this is NOT an
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47 fprintf format string, it is a literal string */
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48
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49 #undef REGISTER_PREFIX
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50 #define REGISTER_PREFIX "%"
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51
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52 /* The prefix for local (compiler generated) labels.
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53 These labels will not appear in the symbol table. */
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54
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55 #undef LOCAL_LABEL_PREFIX
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56 #define LOCAL_LABEL_PREFIX "."
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57
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58 /* The prefix to add to user-visible assembler symbols. */
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59
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60 #undef USER_LABEL_PREFIX
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61 #define USER_LABEL_PREFIX ""
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62
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63 #define ASM_COMMENT_START "|"
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64
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65 /* Target OS builtins. */
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66 #define TARGET_OS_CPP_BUILTINS() LINUX_TARGET_OS_CPP_BUILTINS()
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67
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68 #undef CPP_SPEC
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69 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
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70
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71 /* Provide a LINK_SPEC appropriate for GNU/Linux. Here we provide support
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72 for the special GCC options -static and -shared, which allow us to
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73 link things in one of these three modes by applying the appropriate
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74 combinations of options at link-time. We like to support here for
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75 as many of the other GNU linker options as possible. But I don't
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76 have the time to search for those flags. I am sure how to add
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77 support for -soname shared_object_name. H.J.
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78
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79 I took out %{v:%{!V:-V}}. It is too much :-(. They can use
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80 -Wl,-V.
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81
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82 When the -shared link option is used a final link is not being
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83 done. */
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84
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85 /* If ELF is the default format, we should not use /lib/elf. */
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86
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87 #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
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88
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89 #undef LINK_SPEC
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90 #define LINK_SPEC "-m m68kelf %{shared} \
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91 %{!shared: \
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92 %{!static: \
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93 %{rdynamic:-export-dynamic} \
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94 %{!dynamic-linker*:-dynamic-linker " LINUX_DYNAMIC_LINKER "}} \
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95 %{static}}"
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96
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97 /* For compatibility with linux/a.out */
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98
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99 #undef PCC_BITFIELD_TYPE_MATTERS
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100
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101 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
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102 keep switch tables in the text section. */
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103
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104 #define JUMP_TABLES_IN_TEXT_SECTION 1
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105
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106 /* Use the default action for outputting the case label. */
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107 #undef ASM_OUTPUT_CASE_LABEL
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108 #define ASM_RETURN_CASE_JUMP \
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109 do { \
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110 if (TARGET_COLDFIRE) \
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111 { \
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112 if (ADDRESS_REG_P (operands[0])) \
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113 return "jmp %%pc@(2,%0:l)"; \
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114 else \
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115 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
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116 } \
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117 else \
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118 return "jmp %%pc@(2,%0:w)"; \
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119 } while (0)
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120
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121 /* This is how to output an assembler line that says to advance the
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122 location counter to a multiple of 2**LOG bytes. */
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123
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124 #undef ASM_OUTPUT_ALIGN
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125 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
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126 if ((LOG) > 0) \
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127 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));
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128
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129 #ifdef HAVE_GAS_BALIGN_AND_P2ALIGN
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130 /* Use "move.l %a4,%a4" to advance within code. */
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131 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \
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132 if ((LOG) > 0) \
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133 fprintf ((FILE), "\t.balignw %u,0x284c\n", 1 << (LOG));
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134 #endif
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135
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136 /* If defined, a C expression whose value is a string containing the
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137 assembler operation to identify the following data as uninitialized global
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138 data. */
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139
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140 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
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141
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142 /* A C statement (sans semicolon) to output to the stdio stream
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143 FILE the assembler definition of uninitialized global DECL named
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144 NAME whose size is SIZE bytes and alignment is ALIGN bytes.
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145 Try to use asm_output_aligned_bss to implement this macro. */
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146
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147 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
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148 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
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149
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150 /* Output assembler code to FILE to increment profiler label # LABELNO
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151 for profiling a function entry. */
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152
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153 #undef FUNCTION_PROFILER
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154 #define FUNCTION_PROFILER(FILE, LABELNO) \
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155 { \
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156 asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \
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157 if (flag_pic) \
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158 fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \
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159 else \
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160 fprintf (FILE, "\tjbsr _mcount\n"); \
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161 }
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162
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163 /* Do not break .stabs pseudos into continuations. */
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164
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165 #define DBX_CONTIN_LENGTH 0
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166
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167 /* 1 if N is a possible register number for a function value. For
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168 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
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169 pointer, or floating types, respectively. Reject fp0 if not using
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170 a 68881 coprocessor. */
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171
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172 #undef FUNCTION_VALUE_REGNO_P
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173 #define FUNCTION_VALUE_REGNO_P(N) \
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174 ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))
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175
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176 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
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177 more than one register. */
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178
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179 #undef NEEDS_UNTYPED_CALL
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180 #define NEEDS_UNTYPED_CALL 1
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181
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182 /* Define how to generate (in the callee) the output value of a
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183 function and how to find (in the caller) the value returned by a
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184 function. VALTYPE is the data type of the value (as a tree). If
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185 the precise function being called is known, FUNC is its
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186 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
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187 result in d0, a0, or fp0 as appropriate. */
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188
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189 #undef FUNCTION_VALUE
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190 #define FUNCTION_VALUE(VALTYPE, FUNC) \
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191 m68k_function_value (VALTYPE, FUNC)
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192
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193 /* Define how to find the value returned by a library function
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194 assuming the value has mode MODE.
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195 For m68k/SVR4 look for integer values in d0, pointer values in d0
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196 (returned in both d0 and a0), and floating values in fp0. */
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197
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198 #undef LIBCALL_VALUE
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199 #define LIBCALL_VALUE(MODE) \
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200 m68k_libcall_value (MODE)
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201
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202 /* For m68k SVR4, structures are returned using the reentrant
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203 technique. */
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204 #undef PCC_STATIC_STRUCT_RETURN
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205 #define DEFAULT_PCC_STRUCT_RETURN 0
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206
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207 /* Finalize the trampoline by flushing the insn cache. */
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208
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209 #undef FINALIZE_TRAMPOLINE
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210 #define FINALIZE_TRAMPOLINE(TRAMP) \
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211 emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__clear_cache"), \
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212 0, VOIDmode, 2, TRAMP, Pmode, \
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213 plus_constant (TRAMP, TRAMPOLINE_SIZE), Pmode);
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214
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215 /* Clear the instruction cache from `beg' to `end'. This makes an
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216 inline system call to SYS_cacheflush. The arguments are as
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217 follows:
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218
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219 cacheflush (addr, scope, cache, len)
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220
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221 addr - the start address for the flush
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222 scope - the scope of the flush (see the cpush insn)
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223 cache - which cache to flush (see the cpush insn)
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224 len - a factor relating to the number of flushes to perform:
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225 len/16 lines, or len/4096 pages. */
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226
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227 #define CLEAR_INSN_CACHE(BEG, END) \
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228 { \
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229 register unsigned long _beg __asm ("%d1") = (unsigned long) (BEG); \
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230 unsigned long _end = (unsigned long) (END); \
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231 register unsigned long _len __asm ("%d4") = (_end - _beg + 32); \
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232 __asm __volatile \
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233 ("move%.l #123, %/d0\n\t" /* system call nr */ \
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234 "move%.l #1, %/d2\n\t" /* clear lines */ \
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235 "move%.l #3, %/d3\n\t" /* insn+data caches */ \
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236 "trap #0" \
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237 : /* no outputs */ \
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238 : "d" (_beg), "d" (_len) \
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239 : "%d0", "%d2", "%d3"); \
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240 }
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241
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242 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
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243
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244 #define MD_UNWIND_SUPPORT "config/m68k/linux-unwind.h"
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