1 | /* |
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2 | |
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3 | Copyright (c) 2005 Red Hat Incorporated. |
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4 | All rights reserved. |
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5 | |
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6 | Redistribution and use in source and binary forms, with or without |
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7 | modification, are permitted provided that the following conditions are met: |
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8 | |
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9 | Redistributions of source code must retain the above copyright |
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10 | notice, this list of conditions and the following disclaimer. |
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11 | |
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12 | Redistributions in binary form must reproduce the above copyright |
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13 | notice, this list of conditions and the following disclaimer in the |
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14 | documentation and/or other materials provided with the distribution. |
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15 | |
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16 | The name of Red Hat Incorporated may not be used to endorse |
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17 | or promote products derived from this software without specific |
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18 | prior written permission. |
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19 | |
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20 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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21 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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22 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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23 | DISCLAIMED. IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY |
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24 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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25 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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26 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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27 | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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28 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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29 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 | |
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31 | */ |
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32 | |
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33 | #if defined(__r8c_cpu__) || defined(__m16c_cpu__) |
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34 | #define A16 |
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35 | #define A(n,w) n |
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36 | #define W w |
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37 | #define ALIGN 1 |
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38 | #else |
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39 | #define A24 |
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40 | #define A(n,w) w |
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41 | #define W l |
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42 | #define ALIGN 2 |
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43 | #endif |
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44 | |
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45 | .text |
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46 | |
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47 | .global _start |
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48 | _start: |
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49 | .LFB2: |
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50 | fset U /* User stack */ |
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51 | ldc #__stack,sp |
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52 | |
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53 | #ifdef A16 |
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54 | mov.b #%hi8(__romdatastart),r1h |
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55 | mov.w #%lo16(__romdatastart),a0 |
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56 | mov.w #__datastart,a1 |
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57 | #else |
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58 | mov.l #__romdatastart,a0 |
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59 | mov.l #__datastart,a1 |
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60 | #endif |
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61 | mov.w #__romdatacopysize,r3 |
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62 | shl.w #-1,r3 |
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63 | smovf.w |
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64 | |
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65 | #ifdef A16 |
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66 | mov.w #__bssstart,a1 |
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67 | #else |
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68 | mov.l #__bssstart,a1 |
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69 | #endif |
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70 | mov.w #__bsssize,r3 |
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71 | shl.w #-1,r3 |
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72 | mov.w #0,r0 |
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73 | sstr.w |
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74 | |
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75 | /* jsr.a __m32c_init */ |
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76 | |
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77 | jsr.a _boot_card |
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78 | .LFE2: |
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79 | |
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80 | #ifdef A24 |
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81 | /* rv in r0, ok for arg0 */ |
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82 | #else |
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83 | mov.w r0,r1 |
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84 | #endif |
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85 | |
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86 | jsr.a _sys_exit |
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87 | |
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88 | .text |
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89 | |
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90 | .global _m32c_run_preinit_array |
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91 | .type _m32c_run_preinit_array,@function |
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92 | _m32c_run_preinit_array: |
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93 | mov.W #__preinit_array_start,a0 |
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94 | mov.W #__preinit_array_end,a1 |
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95 | jmp.w _m32c_run_inilist |
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96 | |
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97 | .global _m32c_run_init_array |
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98 | .type _m32c_run_init_array,@function |
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99 | _m32c_run_init_array: |
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100 | mov.W #__init_array_start,a0 |
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101 | mov.W #__init_array_end,a1 |
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102 | jmp.w _m32c_run_inilist |
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103 | |
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104 | .global _m32c_run_fini_array |
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105 | .type _m32c_run_fini_array,@function |
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106 | _m32c_run_fini_array: |
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107 | mov.W #__fini_array_start,a0 |
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108 | mov.W #__fini_array_end,a1 |
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109 | /* fall through */ |
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110 | |
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111 | _m32c_run_inilist: |
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112 | next_inilist: |
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113 | cmp.W a0,a1 |
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114 | jeq done_inilist |
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115 | pushm a0,a1 |
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116 | mov.W [a0],a0 |
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117 | #ifdef A16 |
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118 | mov.b:s #0,a1 /* zero extends */ |
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119 | jsri.a a1a0 |
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120 | #else |
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121 | jsri.a a0 |
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122 | #endif |
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123 | popm a0,a1 |
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124 | add.W A(#2,#4),a0 |
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125 | jmp.b next_inilist |
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126 | done_inilist: |
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127 | rts |
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128 | |
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129 | .section .init,"ax",@progbits |
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130 | |
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131 | .global __init |
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132 | .global __m32c_init |
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133 | __init: |
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134 | __m32c_init: |
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135 | enter #0 |
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136 | exitd |
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137 | |
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138 | .section .fini,"ax",@progbits |
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139 | |
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140 | .global __fini |
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141 | .global __m32c_fini |
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142 | __fini: |
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143 | __m32c_fini: |
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144 | enter #0 |
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145 | jsr.a _m32c_run_fini_array |
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146 | exitd |
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147 | |
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148 | |
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149 | ;;; Provide Dwarf unwinding information that will help GDB stop |
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150 | ;;; backtraces at the right place. This is stolen from assembly |
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151 | ;;; code generated by GCC with -dA. |
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152 | .section .debug_frame,"",@progbits |
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153 | .Lframe0: |
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154 | .4byte .LECIE0-.LSCIE0 ; Length of Common Information Entry |
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155 | .LSCIE0: |
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156 | .4byte 0xffffffff ; CIE Identifier Tag |
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157 | .byte 0x1 ; CIE Version |
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158 | .ascii "\0" ; CIE Augmentation |
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159 | .uleb128 0x1 ; CIE Code Alignment Factor |
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160 | .sleb128 -1 ; CIE Data Alignment Factor |
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161 | .byte 0xd ; CIE RA Column |
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162 | .byte 0xc ; DW_CFA_def_cfa |
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163 | .uleb128 0xc |
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164 | .uleb128 0x3 |
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165 | .byte 0x8d ; DW_CFA_offset, column 0xd |
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166 | .uleb128 0x3 |
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167 | .p2align ALIGN |
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168 | .LECIE0: |
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169 | .LSFDE0: |
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170 | .4byte .LEFDE0-.LASFDE0 ; FDE Length |
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171 | .LASFDE0: |
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172 | .4byte .Lframe0 ; FDE CIE offset |
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173 | .4byte .LFB2 ; FDE initial location |
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174 | .4byte .LFE2-.LFB2 ; FDE address range |
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175 | .byte 0xf ; DW_CFA_def_cfa_expression |
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176 | .uleb128 1 ; length of expression |
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177 | .byte 0x30 ; DW_OP_lit0 |
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178 | .p2align ALIGN |
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179 | .LEFDE0: |
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180 | |
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181 | .text |
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