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1 /* Definitions of target machine for GNU compiler, for DEC Alpha w/ELF.
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2 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2007, 2008
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3 Free Software Foundation, Inc.
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4 Contributed by Richard Henderson (rth@tamu.edu).
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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 OBJECT_FORMAT_COFF
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23 #undef EXTENDED_COFF
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24 #define OBJECT_FORMAT_ELF
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25
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26 /* ??? Move all SDB stuff from alpha.h to osf.h. */
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27 #undef SDB_DEBUGGING_INFO
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28
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29 #define DBX_DEBUGGING_INFO 1
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30 #define DWARF2_DEBUGGING_INFO 1
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31
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32 #undef PREFERRED_DEBUGGING_TYPE
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33 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
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34
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35 #undef ASM_FINAL_SPEC
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36
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37 /* alpha/ doesn't use elfos.h for some reason. */
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38 #define TARGET_OBJFMT_CPP_BUILTINS() \
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39 do \
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40 { \
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41 builtin_define ("__ELF__"); \
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42 } \
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43 while (0)
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44
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45 #undef CC1_SPEC
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46 #define CC1_SPEC "%{G*}"
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47
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48 #undef ASM_SPEC
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49 #define ASM_SPEC "%{G*} %{relax:-relax} %{!gstabs*:-no-mdebug}%{gstabs*:-mdebug}"
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50
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51 #undef IDENT_ASM_OP
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52 #define IDENT_ASM_OP "\t.ident\t"
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53
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54 /* Output #ident as a .ident. */
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55 #undef ASM_OUTPUT_IDENT
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56 #define ASM_OUTPUT_IDENT(FILE, NAME) \
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57 fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
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58
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59 /* This is how to allocate empty space in some section. The .zero
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60 pseudo-op is used for this on most svr4 assemblers. */
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61
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62 #undef SKIP_ASM_OP
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63 #define SKIP_ASM_OP "\t.zero\t"
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64
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65 #undef ASM_OUTPUT_SKIP
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66 #define ASM_OUTPUT_SKIP(FILE, SIZE) \
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67 fprintf (FILE, "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE))
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68
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69 /* Output the label which precedes a jumptable. Note that for all svr4
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70 systems where we actually generate jumptables (which is to say every
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71 svr4 target except i386, where we use casesi instead) we put the jump-
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72 tables into the .rodata section and since other stuff could have been
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73 put into the .rodata section prior to any given jumptable, we have to
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74 make sure that the location counter for the .rodata section gets pro-
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75 perly re-aligned prior to the actual beginning of the jump table. */
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76
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77 #undef ALIGN_ASM_OP
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78 #define ALIGN_ASM_OP "\t.align\t"
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79
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80 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
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81 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
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82 ASM_OUTPUT_ALIGN ((FILE), 2);
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83 #endif
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84
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85 #undef ASM_OUTPUT_CASE_LABEL
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86 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
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87 do { \
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88 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
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89 (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); \
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90 } while (0)
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91
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92 /* The standard SVR4 assembler seems to require that certain builtin
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93 library routines (e.g. .udiv) be explicitly declared as .globl
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94 in each assembly file where they are referenced. */
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95
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96 #undef ASM_OUTPUT_EXTERNAL_LIBCALL
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97 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
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98 (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0))
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99
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100 /* This says how to output assembler code to declare an
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101 uninitialized external linkage data object. Under SVR4,
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102 the linker seems to want the alignment of data objects
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103 to depend on their types. We do exactly that here. */
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104
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105 #undef COMMON_ASM_OP
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106 #define COMMON_ASM_OP "\t.comm\t"
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107
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108 #undef ASM_OUTPUT_ALIGNED_COMMON
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109 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
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110 do { \
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111 fprintf ((FILE), "%s", COMMON_ASM_OP); \
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112 assemble_name ((FILE), (NAME)); \
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113 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
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114 } while (0)
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115
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116 /* This says how to output assembler code to declare an
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117 uninitialized internal linkage data object. Under SVR4,
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118 the linker seems to want the alignment of data objects
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119 to depend on their types. We do exactly that here. */
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120
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121 #undef ASM_OUTPUT_ALIGNED_LOCAL
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122 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
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123 do { \
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124 if ((SIZE) <= g_switch_value) \
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125 switch_to_section (sbss_section); \
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126 else \
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127 switch_to_section (bss_section); \
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128 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
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129 if (!flag_inhibit_size_directive) \
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130 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \
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131 ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \
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132 ASM_OUTPUT_LABEL(FILE, NAME); \
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133 ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \
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134 } while (0)
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135
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136 /* This says how to output assembler code to declare an
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137 uninitialized external linkage data object. */
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138
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139 #undef ASM_OUTPUT_ALIGNED_BSS
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140 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
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141 do { \
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142 ASM_OUTPUT_ALIGNED_LOCAL (FILE, NAME, SIZE, ALIGN); \
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143 } while (0)
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144
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145 /* Biggest alignment supported by the object file format of this
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146 machine. Use this macro to limit the alignment which can be
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147 specified using the `__attribute__ ((aligned (N)))' construct. If
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148 not defined, the default value is `BIGGEST_ALIGNMENT'.
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149
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150 This value is really 2^63. Since gcc figures the alignment in bits,
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151 we could only potentially get to 2^60 on suitable hosts. Due to other
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152 considerations in varasm, we must restrict this to what fits in an int. */
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153
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154 #undef MAX_OFILE_ALIGNMENT
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155 #define MAX_OFILE_ALIGNMENT \
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156 (1 << (HOST_BITS_PER_INT < 64 ? HOST_BITS_PER_INT - 2 : 62))
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157
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158 /* This is the pseudo-op used to generate a contiguous sequence of byte
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159 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
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160 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
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161
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162 #undef ASCII_DATA_ASM_OP
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163 #define ASCII_DATA_ASM_OP "\t.ascii\t"
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164
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165 #undef READONLY_DATA_SECTION_ASM_OP
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166 #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata"
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167 #undef BSS_SECTION_ASM_OP
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168 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
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169 #undef SBSS_SECTION_ASM_OP
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170 #define SBSS_SECTION_ASM_OP "\t.section\t.sbss,\"aw\""
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171 #undef SDATA_SECTION_ASM_OP
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172 #define SDATA_SECTION_ASM_OP "\t.section\t.sdata,\"aw\""
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173
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174 /* On svr4, we *do* have support for the .init and .fini sections, and we
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175 can put stuff in there to be executed before and after `main'. We let
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176 crtstuff.c and other files know this by defining the following symbols.
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177 The definitions say how to change sections to the .init and .fini
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178 sections. This is the same for all known svr4 assemblers. */
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179
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180 #undef INIT_SECTION_ASM_OP
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181 #define INIT_SECTION_ASM_OP "\t.section\t.init"
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182 #undef FINI_SECTION_ASM_OP
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183 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
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184
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185 #ifdef HAVE_GAS_SUBSECTION_ORDERING
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186
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187 #define ASM_SECTION_START_OP "\t.subsection\t-1"
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188
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189 /* Output assembly directive to move to the beginning of current section. */
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190 #define ASM_OUTPUT_SECTION_START(FILE) \
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191 fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
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192
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193 #endif
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194
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195 /* Switch into a generic section. */
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196 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
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197 #define TARGET_ASM_SELECT_SECTION default_elf_select_section
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198
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199 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
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200
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201 /* Define the strings used for the special svr4 .type and .size directives.
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202 These strings generally do not vary from one system running svr4 to
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203 another, but if a given system (e.g. m88k running svr) needs to use
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204 different pseudo-op names for these, they may be overridden in the
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205 file which includes this one. */
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206
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207 #undef TYPE_ASM_OP
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208 #define TYPE_ASM_OP "\t.type\t"
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209 #undef SIZE_ASM_OP
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210 #define SIZE_ASM_OP "\t.size\t"
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211
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212 /* This is how we tell the assembler that a symbol is weak. */
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213
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214 #undef ASM_WEAKEN_LABEL
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215 #define ASM_WEAKEN_LABEL(FILE, NAME) \
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216 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
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217 fputc ('\n', FILE); } while (0)
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218
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219 /* This is how we tell the assembler that two symbols have the same value. */
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220
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221 #undef ASM_OUTPUT_DEF
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222 #define ASM_OUTPUT_DEF(FILE, ALIAS, NAME) \
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223 do { \
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224 assemble_name(FILE, ALIAS); \
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225 fputs(" = ", FILE); \
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226 assemble_name(FILE, NAME); \
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227 fputc('\n', FILE); \
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228 } while (0)
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229
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230 #undef ASM_OUTPUT_DEF_FROM_DECLS
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231 #define ASM_OUTPUT_DEF_FROM_DECLS(FILE, DECL, TARGET) \
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232 do { \
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233 const char *alias = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
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234 const char *name = IDENTIFIER_POINTER (TARGET); \
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235 if (TREE_CODE (DECL) == FUNCTION_DECL) \
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236 { \
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237 fputc ('$', FILE); \
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238 assemble_name (FILE, alias); \
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239 fputs ("..ng = $", FILE); \
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240 assemble_name (FILE, name); \
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241 fputs ("..ng\n", FILE); \
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242 } \
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243 assemble_name(FILE, alias); \
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244 fputs(" = ", FILE); \
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245 assemble_name(FILE, name); \
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246 fputc('\n', FILE); \
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247 } while (0)
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248
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249 /* The following macro defines the format used to output the second
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250 operand of the .type assembler directive. Different svr4 assemblers
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251 expect various different forms for this operand. The one given here
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252 is just a default. You may need to override it in your machine-
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253 specific tm.h file (depending upon the particulars of your assembler). */
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254
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255 #undef TYPE_OPERAND_FMT
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256 #define TYPE_OPERAND_FMT "@%s"
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257
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258 /* Write the extra assembler code needed to declare a function's result.
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259 Most svr4 assemblers don't require any special declaration of the
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260 result value, but there are exceptions. */
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261
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262 #ifndef ASM_DECLARE_RESULT
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263 #define ASM_DECLARE_RESULT(FILE, RESULT)
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264 #endif
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265
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266 /* These macros generate the special .type and .size directives which
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267 are used to set the corresponding fields of the linker symbol table
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268 entries in an ELF object file under SVR4. These macros also output
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269 the starting labels for the relevant functions/objects. */
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270
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271 /* Write the extra assembler code needed to declare an object properly. */
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272
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273 #undef ASM_DECLARE_OBJECT_NAME
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274 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
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275 do { \
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276 HOST_WIDE_INT size; \
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277 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
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278 size_directive_output = 0; \
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279 if (!flag_inhibit_size_directive \
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280 && DECL_SIZE (DECL) \
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281 && (size = int_size_in_bytes (TREE_TYPE (DECL))) > 0) \
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282 { \
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283 size_directive_output = 1; \
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284 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
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285 } \
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286 ASM_OUTPUT_LABEL(FILE, NAME); \
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287 } while (0)
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288
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289 /* Output the size directive for a decl in rest_of_decl_compilation
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290 in the case where we did not do so before the initializer.
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291 Once we find the error_mark_node, we know that the value of
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292 size_directive_output was set
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293 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
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294
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295 #undef ASM_FINISH_DECLARE_OBJECT
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296 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
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297 do { \
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298 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
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299 HOST_WIDE_INT size; \
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300 if (!flag_inhibit_size_directive \
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301 && DECL_SIZE (DECL) \
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302 && ! AT_END && TOP_LEVEL \
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303 && DECL_INITIAL (DECL) == error_mark_node \
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304 && !size_directive_output \
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305 && (size = int_size_in_bytes (TREE_TYPE (DECL))) > 0) \
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306 { \
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307 size_directive_output = 1; \
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308 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \
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309 } \
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310 } while (0)
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311
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312 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
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313 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
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314 corresponds to a particular byte value [0..255]. For any
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315 given byte value, if the value in the corresponding table
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316 position is zero, the given character can be output directly.
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317 If the table value is 1, the byte must be output as a \ooo
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318 octal escape. If the tables value is anything else, then the
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319 byte value should be output as a \ followed by the value
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320 in the table. Note that we can use standard UN*X escape
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321 sequences for many control characters, but we don't use
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322 \a to represent BEL because some svr4 assemblers (e.g. on
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323 the i386) don't know about that. Also, we don't use \v
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324 since some versions of gas, such as 2.2 did not accept it. */
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325
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326 #undef ESCAPES
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327 #define ESCAPES \
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328 "\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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329 \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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330 \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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331 \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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332 \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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333 \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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334 \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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335 \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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336
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337 /* Some svr4 assemblers have a limit on the number of characters which
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338 can appear in the operand of a .string directive. If your assembler
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339 has such a limitation, you should define STRING_LIMIT to reflect that
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340 limit. Note that at least some svr4 assemblers have a limit on the
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341 actual number of bytes in the double-quoted string, and that they
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342 count each character in an escape sequence as one byte. Thus, an
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343 escape sequence like \377 would count as four bytes.
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344
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345 If your target assembler doesn't support the .string directive, you
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346 should define this to zero. */
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347
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348 #undef STRING_LIMIT
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349 #define STRING_LIMIT ((unsigned) 256)
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350 #undef STRING_ASM_OP
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351 #define STRING_ASM_OP "\t.string\t"
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352
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353 /* GAS is the only Alpha/ELF assembler. */
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354 #undef TARGET_GAS
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355 #define TARGET_GAS (1)
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356
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357 /* Provide a STARTFILE_SPEC appropriate for ELF. Here we add the
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358 (even more) magical crtbegin.o file which provides part of the
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359 support for getting C++ file-scope static object constructed
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360 before entering `main'. */
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361
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362 #undef STARTFILE_SPEC
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363 #ifdef HAVE_LD_PIE
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364 #define STARTFILE_SPEC \
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365 "%{!shared: %{pg|p:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}\
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366 crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
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367 #else
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368 #define STARTFILE_SPEC \
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369 "%{!shared: %{pg|p:gcrt1.o%s;:crt1.o%s}}\
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370 crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
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371 #endif
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372
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373 /* Provide a ENDFILE_SPEC appropriate for ELF. Here we tack on the
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374 magical crtend.o file which provides part of the support for
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375 getting C++ file-scope static object constructed before entering
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376 `main', followed by a normal ELF "finalizer" file, `crtn.o'. */
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377
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378 #undef ENDFILE_SPEC
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379 #define ENDFILE_SPEC \
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380 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
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381 %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
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382
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383 /* We support #pragma. */
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384 #define HANDLE_SYSV_PRAGMA 1
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385
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386 /* Select a format to encode pointers in exception handling data. CODE
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387 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
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388 true if the symbol may be affected by dynamic relocations.
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389
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390 Since application size is already constrained to <2GB by the form of
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391 the ldgp relocation, we can use a 32-bit pc-relative relocation to
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392 static data. Dynamic data is accessed indirectly to allow for read
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393 only EH sections. */
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394 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
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395 (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4)
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396
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397 /* If defined, a C statement to be executed just prior to the output of
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398 assembler code for INSN. */
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399 #define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS) \
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400 (alpha_this_literal_sequence_number = 0, \
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401 alpha_this_gpdisp_sequence_number = 0)
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402 extern int alpha_this_literal_sequence_number;
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403 extern int alpha_this_gpdisp_sequence_number;
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404
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405 /* Since the bits of the _init and _fini function is spread across
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406 many object files, each potentially with its own GP, we must assume
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407 we need to load our GP. Further, the .init/.fini section can
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408 easily be more than 4MB away from the function to call so we can't
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409 use bsr. */
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410 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
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411 asm (SECTION_OP "\n" \
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412 " br $29,1f\n" \
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413 "1: ldgp $29,0($29)\n" \
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414 " unop\n" \
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415 " jsr $26," USER_LABEL_PREFIX #FUNC "\n" \
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416 " .align 3\n" \
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417 " .previous");
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418
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419 /* If we have the capability create headers for efficient EH lookup.
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420 As of Jan 2002, only glibc 2.2.4 can actually make use of this, but
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421 I imagine that other systems will catch up. In the meantime, it
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422 doesn't harm to make sure that the data exists to be used later. */
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423 #if defined(HAVE_LD_EH_FRAME_HDR)
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424 #define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
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425 #endif
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426
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427 /* A C statement (sans semicolon) to output to the stdio stream STREAM
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428 any text necessary for declaring the name of an external symbol
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429 named NAME which is referenced in this compilation but not defined.
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430 It is needed to properly support non-default visibility. */
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431
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432 #ifndef ASM_OUTPUT_EXTERNAL
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433 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
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434 default_elf_asm_output_external (FILE, DECL, NAME)
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435 #endif
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