1 | /* |
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2 | * memory map assumed by prom and standalone system |
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3 | * |
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4 | * physical kseg1 use |
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5 | * |
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6 | * 0x1fc20000 0xbfc20000 |
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7 | * to prom text and read-only data |
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8 | * 0x1fc00000 0xbfc00000 (in cpu board "prom space") |
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9 | * |
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10 | * (Top of RAM - 8K) downward sash and standalone program stack |
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11 | * | ( - 8K to preserve kernel message bufs) |
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12 | * V (standalone programs grow their stack |
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13 | * immediately below sash's stack) |
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14 | * |
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15 | * ^ |
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16 | * | |
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17 | * 0x00100000 0xa0100000 upward sash program text, data, and bss |
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18 | * |
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19 | * ^ |
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20 | * | |
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21 | * 0x00020000 0xa0020000 upward standalone program text, data, and bss |
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22 | * (kernel is loaded here, also) |
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23 | * |
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24 | * 0x0001ffff 0xa001ffff downward dbgmon stack |
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25 | * | |
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26 | * V |
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27 | * |
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28 | * ^ |
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29 | * | |
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30 | * 0x00010000 0xa0010000 upward dbgmon text, data, and bss |
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31 | * |
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32 | * 0x0000ffff 0xa000ffff downward prom monitor stack |
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33 | * | |
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34 | * V |
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35 | * |
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36 | * ^ |
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37 | * | |
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38 | * 0x00000500 0xa0000500 upward prom monitor bss |
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39 | * |
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40 | * 0x000004ff 0xa00004ff |
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41 | * to restart block |
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42 | * 0x00000400 0xa0000400 |
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43 | * |
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44 | * 0x000003ff 0xa00003ff |
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45 | * to general exception code |
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46 | * 0x00000080 0xa0000080 (note cpu addresses as 0x80000080!) |
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47 | * |
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48 | * 0x0000007f 0xa000007f |
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49 | * to utlbmiss exception code |
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50 | * 0x00000000 0xa0000000 (note cpu addresses as 0x80000000!) |
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51 | */ |
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52 | |
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53 | /* Uncomment this if you want srecords. |
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54 | OUTPUT_FORMAT(srec) |
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55 | */ |
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56 | ENTRY(start) |
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57 | STARTUP(crt0.o) |
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58 | INPUT(array.o) |
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59 | SEARCH_DIR(.) |
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60 | __DYNAMIC = 0; |
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61 | |
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62 | /* |
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63 | * Allocate the stack to be at the top of memory, since the stack |
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64 | * grows down |
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65 | * |
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66 | PROVIDE (__stack = 1M - 8); |
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67 | */ |
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68 | |
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69 | /* |
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70 | * Initalize some symbols to be zero so we can reference them in the |
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71 | * crt0 without core dumping. These functions are all optional, but |
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72 | * we do this so we can have our crt0 always use them if they exist. |
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73 | * This is so BSPs work better when using the crt0 installed with gcc. |
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74 | * We have to initalize them twice, so we multiple object file |
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75 | * formats, as some prepend an underscore. |
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76 | */ |
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77 | PROVIDE (hardware_exit_hook = 0); |
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78 | PROVIDE (hardware_hazard_hook = 0); |
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79 | PROVIDE (hardware_init_hook = 0); |
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80 | PROVIDE (software_init_hook = 0); |
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81 | |
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82 | SECTIONS |
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83 | { |
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84 | . = 0x80020000; |
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85 | .text : { |
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86 | _ftext = . ; |
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87 | KEEP (*(.init)) |
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88 | eprol = .; |
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89 | *(.text) |
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90 | *(.text.*) |
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91 | *(.gnu.linkonce.t.*) |
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92 | *(.mips16.fn.*) |
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93 | *(.mips16.call.*) |
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94 | PROVIDE (__runtime_reloc_start = .); |
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95 | *(.rel.sdata) |
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96 | PROVIDE (__runtime_reloc_stop = .); |
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97 | KEEP (*(.fini)) |
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98 | etext = .; |
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99 | _etext = .; |
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100 | } |
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101 | |
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102 | .eh_frame_hdr : { *(.eh_frame_hdr) } |
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103 | .eh_frame : { KEEP (*(.eh_frame)) } |
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104 | .gcc_except_table : { *(.gcc_except_table) } |
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105 | .jcr : { KEEP (*(.jcr)) } |
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106 | .ctors : |
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107 | { |
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108 | /* gcc uses crtbegin.o to find the start of |
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109 | the constructors, so we make sure it is |
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110 | first. Because this is a wildcard, it |
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111 | doesn't matter if the user does not |
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112 | actually link against crtbegin.o; the |
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113 | linker won't look for a file to match a |
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114 | wildcard. The wildcard also means that it |
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115 | doesn't matter which directory crtbegin.o |
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116 | is in. */ |
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117 | |
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118 | KEEP (*crtbegin.o(.ctors)) |
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119 | |
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120 | /* We don't want to include the .ctor section from |
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121 | from the crtend.o file until after the sorted ctors. |
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122 | The .ctor section from the crtend file contains the |
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123 | end of ctors marker and it must be last */ |
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124 | |
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125 | KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors)) |
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126 | KEEP (*(SORT(.ctors.*))) |
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127 | KEEP (*(.ctors)) |
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128 | } |
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129 | |
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130 | .dtors : |
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131 | { |
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132 | KEEP (*crtbegin.o(.dtors)) |
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133 | KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors)) |
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134 | KEEP (*(SORT(.dtors.*))) |
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135 | KEEP (*(.dtors)) |
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136 | } |
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137 | |
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138 | . = .; |
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139 | .rdata : { |
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140 | *(.rdata) |
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141 | *(.rodata) |
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142 | *(.rodata.*) |
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143 | *(.gnu.linkonce.r.*) |
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144 | } |
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145 | _fdata = ALIGN(16); |
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146 | .data : { |
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147 | *(.data) |
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148 | *(.data.*) |
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149 | *(.gnu.linkonce.d.*) |
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150 | } |
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151 | _gp = ALIGN(16) + 0x8000; |
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152 | .lit8 : { |
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153 | *(.lit8) |
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154 | } |
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155 | .lit4 : { |
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156 | *(.lit4) |
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157 | } |
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158 | .sdata : { |
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159 | *(.sdata) |
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160 | *(.sdata.*) |
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161 | *(.gnu.linkonce.s.*) |
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162 | } |
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163 | edata = .; |
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164 | _edata = .; |
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165 | _fbss = .; |
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166 | .sbss : { |
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167 | *(.sbss) |
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168 | *(.sbss.*) |
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169 | *(.gnu.linkonce.sb.*) |
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170 | *(.scommon) |
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171 | } |
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172 | .bss : { |
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173 | _bss_start = . ; |
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174 | *(.bss) |
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175 | *(.bss.*) |
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176 | *(.gnu.linkonce.b.*) |
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177 | *(COMMON) |
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178 | } |
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179 | end = .; |
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180 | _end = .; |
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181 | } |
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