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1 /* elfos.h -- operating system specific defines to be used when
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2 targeting GCC for some generic ELF system
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3 Copyright (C) 1991, 1994, 1995, 1999, 2000, 2001, 2002, 2003, 2004,
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4 2007, 2009 Free Software Foundation, Inc.
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5 Based on svr4.h contributed by Ron Guilmette (rfg@netcom.com).
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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 Under Section 7 of GPL version 3, you are granted additional
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20 permissions described in the GCC Runtime Library Exception, version
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21 3.1, as published by the Free Software Foundation.
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22
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23 You should have received a copy of the GNU General Public License and
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24 a copy of the GCC Runtime Library Exception along with this program;
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25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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26 <http://www.gnu.org/licenses/>. */
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27
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28 #define TARGET_OBJFMT_CPP_BUILTINS() \
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29 do \
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30 { \
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31 builtin_define ("__ELF__"); \
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32 } \
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33 while (0)
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34
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35 /* Define a symbol indicating that we are using elfos.h.
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36 Some CPU specific configuration files use this. */
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37 #define USING_ELFOS_H
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38
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39 /* The prefix to add to user-visible assembler symbols.
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40
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41 For ELF systems the convention is *not* to prepend a leading
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42 underscore onto user-level symbol names. */
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43
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44 #undef USER_LABEL_PREFIX
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45 #define USER_LABEL_PREFIX ""
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46
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47 /* The biggest alignment supported by ELF in bits. 32-bit ELF
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48 supports section alignment up to (0x80000000 * 8), while
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49 64-bit ELF supports (0x8000000000000000 * 8). If this macro
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50 is not defined, the default is the largest alignment supported
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51 by 32-bit ELF and representable on a 32-bit host. Use this
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52 macro to limit the alignment which can be specified using
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53 the `__attribute__ ((aligned (N)))' construct. */
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54 #ifndef MAX_OFILE_ALIGNMENT
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55 #define MAX_OFILE_ALIGNMENT (((unsigned int) 1 << 28) * 8)
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56 #endif
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57
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58 /* Use periods rather than dollar signs in special g++ assembler names. */
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59
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60 #define NO_DOLLAR_IN_LABEL
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61
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62 /* Writing `int' for a bit-field forces int alignment for the structure. */
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63
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64 #ifndef PCC_BITFIELD_TYPE_MATTERS
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65 #define PCC_BITFIELD_TYPE_MATTERS 1
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66 #endif
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67
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68 /* Handle #pragma weak and #pragma pack. */
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69
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70 #define HANDLE_SYSV_PRAGMA 1
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71
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72 /* All ELF targets can support DWARF-2. */
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73
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74 #define DWARF2_DEBUGGING_INFO 1
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75
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76 /* The GNU tools operate better with dwarf2, and it is required by some
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77 psABI's. Since we don't have any native tools to be compatible with,
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78 default to dwarf2. */
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79
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80 #ifndef PREFERRED_DEBUGGING_TYPE
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81 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
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82 #endif
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83
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84 /* All SVR4 targets use the ELF object file format. */
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85 #define OBJECT_FORMAT_ELF
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86
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87
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88 /* Output #ident as a .ident. */
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89
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90 #define ASM_OUTPUT_IDENT(FILE, NAME) \
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91 fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
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92
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93 #define IDENT_ASM_OP "\t.ident\t"
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94
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95 #undef SET_ASM_OP
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96 #define SET_ASM_OP "\t.set\t"
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97
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98 /* Most svr4 assemblers want a .file directive at the beginning of
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99 their input file. */
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100 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
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101
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102 /* This is how to allocate empty space in some section. The .zero
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103 pseudo-op is used for this on most svr4 assemblers. */
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104
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105 #define SKIP_ASM_OP "\t.zero\t"
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106
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107 #undef ASM_OUTPUT_SKIP
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108 #define ASM_OUTPUT_SKIP(FILE, SIZE) \
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109 fprintf ((FILE), "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n",\
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110 SKIP_ASM_OP, (SIZE))
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111
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112 /* This is how to store into the string LABEL
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113 the symbol_ref name of an internal numbered label where
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114 PREFIX is the class of label and NUM is the number within the class.
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115 This is suitable for output with `assemble_name'.
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116
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117 For most svr4 systems, the convention is that any symbol which begins
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118 with a period is not put into the linker symbol table by the assembler. */
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119
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120 #undef ASM_GENERATE_INTERNAL_LABEL
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121 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
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122 do \
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123 { \
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124 sprintf (LABEL, "*.%s%u", PREFIX, (unsigned) (NUM)); \
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125 } \
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126 while (0)
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127
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128 /* Output the label which precedes a jumptable. Note that for all svr4
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129 systems where we actually generate jumptables (which is to say every
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130 svr4 target except i386, where we use casesi instead) we put the jump-
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131 tables into the .rodata section and since other stuff could have been
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132 put into the .rodata section prior to any given jumptable, we have to
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133 make sure that the location counter for the .rodata section gets pro-
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134 perly re-aligned prior to the actual beginning of the jump table. */
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135
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136 #undef ALIGN_ASM_OP
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137 #define ALIGN_ASM_OP "\t.align\t"
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138
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139 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
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140 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
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141 ASM_OUTPUT_ALIGN ((FILE), 2);
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142 #endif
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143
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144 #undef ASM_OUTPUT_CASE_LABEL
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145 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
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146 do \
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147 { \
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148 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
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149 (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); \
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150 } \
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151 while (0)
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152
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153 /* The standard SVR4 assembler seems to require that certain builtin
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154 library routines (e.g. .udiv) be explicitly declared as .globl
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155 in each assembly file where they are referenced. */
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156
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157 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
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158 (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0))
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159
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160 /* This says how to output assembler code to declare an
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161 uninitialized external linkage data object. Under SVR4,
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162 the linker seems to want the alignment of data objects
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163 to depend on their types. We do exactly that here. */
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164
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165 #define COMMON_ASM_OP "\t.comm\t"
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166
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167 #undef ASM_OUTPUT_ALIGNED_COMMON
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168 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
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169 do \
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170 { \
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171 fprintf ((FILE), "%s", COMMON_ASM_OP); \
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172 assemble_name ((FILE), (NAME)); \
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173 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
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174 (SIZE), (ALIGN) / BITS_PER_UNIT); \
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175 } \
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176 while (0)
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177
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178 /* This says how to output assembler code to declare an
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179 uninitialized internal linkage data object. Under SVR4,
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180 the linker seems to want the alignment of data objects
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181 to depend on their types. We do exactly that here. */
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182
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183 #define LOCAL_ASM_OP "\t.local\t"
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184
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185 #undef ASM_OUTPUT_ALIGNED_LOCAL
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186 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
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187 do \
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188 { \
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189 fprintf ((FILE), "%s", LOCAL_ASM_OP); \
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190 assemble_name ((FILE), (NAME)); \
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191 fprintf ((FILE), "\n"); \
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192 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
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193 } \
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194 while (0)
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195
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196 /* This is the pseudo-op used to generate a contiguous sequence of byte
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197 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
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198 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
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199
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200 #undef ASCII_DATA_ASM_OP
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201 #define ASCII_DATA_ASM_OP "\t.ascii\t"
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202
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203 /* Support a read-only data section. */
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204 #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata"
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205
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206 /* On svr4, we *do* have support for the .init and .fini sections, and we
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207 can put stuff in there to be executed before and after `main'. We let
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208 crtstuff.c and other files know this by defining the following symbols.
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209 The definitions say how to change sections to the .init and .fini
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210 sections. This is the same for all known svr4 assemblers. */
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211
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212 #define INIT_SECTION_ASM_OP "\t.section\t.init"
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213 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
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214
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215 /* Output assembly directive to move to the beginning of current section. */
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216 #ifdef HAVE_GAS_SUBSECTION_ORDERING
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217 # define ASM_SECTION_START_OP "\t.subsection\t-1"
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218 # define ASM_OUTPUT_SECTION_START(FILE) \
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219 fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
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220 #endif
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221
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222 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
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223
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224 /* Switch into a generic section. */
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225 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
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226
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227 #undef TARGET_ASM_SELECT_RTX_SECTION
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228 #define TARGET_ASM_SELECT_RTX_SECTION default_elf_select_rtx_section
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229 #undef TARGET_ASM_SELECT_SECTION
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230 #define TARGET_ASM_SELECT_SECTION default_elf_select_section
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231 #undef TARGET_HAVE_SWITCHABLE_BSS_SECTIONS
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232 #define TARGET_HAVE_SWITCHABLE_BSS_SECTIONS true
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233
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234 /* Define the strings used for the special svr4 .type and .size directives.
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235 These strings generally do not vary from one system running svr4 to
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236 another, but if a given system (e.g. m88k running svr) needs to use
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237 different pseudo-op names for these, they may be overridden in the
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238 file which includes this one. */
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239
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240 #define TYPE_ASM_OP "\t.type\t"
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241 #define SIZE_ASM_OP "\t.size\t"
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242
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243 /* This is how we tell the assembler that a symbol is weak. */
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244
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245 #define ASM_WEAKEN_LABEL(FILE, NAME) \
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246 do \
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247 { \
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248 fputs ("\t.weak\t", (FILE)); \
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249 assemble_name ((FILE), (NAME)); \
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250 fputc ('\n', (FILE)); \
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251 } \
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252 while (0)
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253
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254 /* The following macro defines the format used to output the second
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255 operand of the .type assembler directive. Different svr4 assemblers
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256 expect various different forms for this operand. The one given here
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257 is just a default. You may need to override it in your machine-
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258 specific tm.h file (depending upon the particulars of your assembler). */
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259
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260 #define TYPE_OPERAND_FMT "@%s"
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261
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262 /* Write the extra assembler code needed to declare a function's result.
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263 Most svr4 assemblers don't require any special declaration of the
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264 result value, but there are exceptions. */
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265
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266 #ifndef ASM_DECLARE_RESULT
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267 #define ASM_DECLARE_RESULT(FILE, RESULT)
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268 #endif
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269
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270 /* These macros generate the special .type and .size directives which
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271 are used to set the corresponding fields of the linker symbol table
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272 entries in an ELF object file under SVR4. These macros also output
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273 the starting labels for the relevant functions/objects. */
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274
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275 /* Write the extra assembler code needed to declare a function properly.
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276 Some svr4 assemblers need to also have something extra said about the
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277 function's return value. We allow for that here. */
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278
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279 #ifndef ASM_DECLARE_FUNCTION_NAME
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280 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
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281 do \
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282 { \
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283 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \
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284 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
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285 ASM_OUTPUT_LABEL (FILE, NAME); \
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286 } \
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287 while (0)
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288 #endif
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289
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290 /* Write the extra assembler code needed to declare an object properly. */
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291
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292 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
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293 do \
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294 { \
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295 HOST_WIDE_INT size; \
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296 \
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297 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
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298 \
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299 size_directive_output = 0; \
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300 if (!flag_inhibit_size_directive \
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301 && (DECL) && DECL_SIZE (DECL)) \
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302 { \
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303 size_directive_output = 1; \
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304 size = int_size_in_bytes (TREE_TYPE (DECL)); \
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305 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
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306 } \
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307 \
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308 ASM_OUTPUT_LABEL (FILE, NAME); \
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309 } \
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310 while (0)
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311
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312 /* Output the size directive for a decl in rest_of_decl_compilation
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313 in the case where we did not do so before the initializer.
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314 Once we find the error_mark_node, we know that the value of
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315 size_directive_output was set
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316 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
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317
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318 #undef ASM_FINISH_DECLARE_OBJECT
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319 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)\
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320 do \
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321 { \
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322 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
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323 HOST_WIDE_INT size; \
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324 \
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325 if (!flag_inhibit_size_directive \
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326 && DECL_SIZE (DECL) \
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327 && ! AT_END && TOP_LEVEL \
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328 && DECL_INITIAL (DECL) == error_mark_node \
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329 && !size_directive_output) \
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330 { \
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331 size_directive_output = 1; \
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332 size = int_size_in_bytes (TREE_TYPE (DECL)); \
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333 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \
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334 } \
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335 } \
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336 while (0)
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337
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338 /* This is how to declare the size of a function. */
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339 #ifndef ASM_DECLARE_FUNCTION_SIZE
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340 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
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341 do \
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342 { \
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343 if (!flag_inhibit_size_directive) \
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344 ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \
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345 } \
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346 while (0)
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347 #endif
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348
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349 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
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350 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
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351 corresponds to a particular byte value [0..255]. For any
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352 given byte value, if the value in the corresponding table
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353 position is zero, the given character can be output directly.
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354 If the table value is 1, the byte must be output as a \ooo
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355 octal escape. If the tables value is anything else, then the
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356 byte value should be output as a \ followed by the value
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357 in the table. Note that we can use standard UN*X escape
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358 sequences for many control characters, but we don't use
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359 \a to represent BEL because some svr4 assemblers (e.g. on
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360 the i386) don't know about that. Also, we don't use \v
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361 since some versions of gas, such as 2.2 did not accept it. */
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362
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363 #define ESCAPES \
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364 "\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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365 \0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
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366 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\
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367 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
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368 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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369 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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370 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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371 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
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372
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373 /* Some svr4 assemblers have a limit on the number of characters which
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374 can appear in the operand of a .string directive. If your assembler
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375 has such a limitation, you should define STRING_LIMIT to reflect that
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376 limit. Note that at least some svr4 assemblers have a limit on the
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377 actual number of bytes in the double-quoted string, and that they
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378 count each character in an escape sequence as one byte. Thus, an
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379 escape sequence like \377 would count as four bytes.
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380
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381 If your target assembler doesn't support the .string directive, you
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382 should define this to zero.
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383 */
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384
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385 #define STRING_LIMIT ((unsigned) 256)
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386
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387 #define STRING_ASM_OP "\t.string\t"
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388
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389 /* The routine used to output NUL terminated strings. We use a special
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390 version of this for most svr4 targets because doing so makes the
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391 generated assembly code more compact (and thus faster to assemble)
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392 as well as more readable, especially for targets like the i386
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393 (where the only alternative is to output character sequences as
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394 comma separated lists of numbers). */
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395
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396 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
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397 do \
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398 { \
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399 register const unsigned char *_limited_str = \
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400 (const unsigned char *) (STR); \
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401 register unsigned ch; \
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402 \
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403 fprintf ((FILE), "%s\"", STRING_ASM_OP); \
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404 \
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405 for (; (ch = *_limited_str); _limited_str++) \
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406 { \
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407 register int escape; \
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408 \
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409 switch (escape = ESCAPES[ch]) \
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410 { \
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411 case 0: \
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412 putc (ch, (FILE)); \
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413 break; \
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414 case 1: \
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415 fprintf ((FILE), "\\%03o", ch); \
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416 break; \
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417 default: \
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418 putc ('\\', (FILE)); \
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419 putc (escape, (FILE)); \
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420 break; \
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421 } \
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422 } \
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423 \
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424 fprintf ((FILE), "\"\n"); \
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425 } \
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426 while (0)
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427
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428 /* The routine used to output sequences of byte values. We use a special
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429 version of this for most svr4 targets because doing so makes the
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430 generated assembly code more compact (and thus faster to assemble)
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431 as well as more readable. Note that if we find subparts of the
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432 character sequence which end with NUL (and which are shorter than
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433 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
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434
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435 #undef ASM_OUTPUT_ASCII
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436 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
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437 do \
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438 { \
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439 const unsigned char *_ascii_bytes = \
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440 (const unsigned char *) (STR); \
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441 const unsigned char *limit = _ascii_bytes + (LENGTH); \
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442 const unsigned char *last_null = NULL; \
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443 unsigned bytes_in_chunk = 0; \
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444 \
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445 for (; _ascii_bytes < limit; _ascii_bytes++) \
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446 { \
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447 const unsigned char *p; \
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448 \
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449 if (bytes_in_chunk >= 60) \
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450 { \
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451 fprintf ((FILE), "\"\n"); \
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452 bytes_in_chunk = 0; \
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453 } \
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454 \
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455 if (_ascii_bytes > last_null) \
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456 { \
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457 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
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458 continue; \
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459 last_null = p; \
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460 } \
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461 else \
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462 p = last_null; \
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463 \
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464 if (p < limit && (p - _ascii_bytes) <= (long)STRING_LIMIT) \
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465 { \
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466 if (bytes_in_chunk > 0) \
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467 { \
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|
468 fprintf ((FILE), "\"\n"); \
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469 bytes_in_chunk = 0; \
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470 } \
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471 \
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|
|
472 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
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473 _ascii_bytes = p; \
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474 } \
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475 else \
|
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|
476 { \
|
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|
477 register int escape; \
|
|
|
478 register unsigned ch; \
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|
|
479 \
|
|
|
480 if (bytes_in_chunk == 0) \
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|
|
481 fprintf ((FILE), "%s\"", ASCII_DATA_ASM_OP); \
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|
|
482 \
|
|
|
483 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
|
|
|
484 { \
|
|
|
485 case 0: \
|
|
|
486 putc (ch, (FILE)); \
|
|
|
487 bytes_in_chunk++; \
|
|
|
488 break; \
|
|
|
489 case 1: \
|
|
|
490 fprintf ((FILE), "\\%03o", ch); \
|
|
|
491 bytes_in_chunk += 4; \
|
|
|
492 break; \
|
|
|
493 default: \
|
|
|
494 putc ('\\', (FILE)); \
|
|
|
495 putc (escape, (FILE)); \
|
|
|
496 bytes_in_chunk += 2; \
|
|
|
497 break; \
|
|
|
498 } \
|
|
|
499 } \
|
|
|
500 } \
|
|
|
501 \
|
|
|
502 if (bytes_in_chunk > 0) \
|
|
|
503 fprintf ((FILE), "\"\n"); \
|
|
|
504 } \
|
|
|
505 while (0)
|
|
|
506
|
|
|
507 /* Allow the use of the -frecord-gcc-switches switch via the
|
|
|
508 elf_record_gcc_switches function defined in varasm.c. */
|
|
|
509 #undef TARGET_ASM_RECORD_GCC_SWITCHES
|
|
|
510 #define TARGET_ASM_RECORD_GCC_SWITCHES elf_record_gcc_switches
|
|
|
511
|
|
|
512 /* A C statement (sans semicolon) to output to the stdio stream STREAM
|
|
|
513 any text necessary for declaring the name of an external symbol
|
|
|
514 named NAME which is referenced in this compilation but not defined.
|
|
|
515 It is needed to properly support non-default visibility. */
|
|
|
516
|
|
|
517 #ifndef ASM_OUTPUT_EXTERNAL
|
|
|
518 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
|
|
|
519 default_elf_asm_output_external (FILE, DECL, NAME)
|
|
|
520 #endif
|
