1 | /* Adapteva epiphany-core implementation of stdio support functions () |
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2 | |
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3 | Copyright (c) 2011, 2012 Adapteva, Inc. |
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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 | * Redistributions of source code must retain the above copyright notice, |
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9 | this list of conditions and the following disclaimer. |
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10 | * Redistributions in binary form must reproduce the above copyright |
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11 | notice, this list of conditions and the following disclaimer in the |
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12 | documentation and/or other materials provided with the distribution. |
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13 | * Neither the name of Adapteva nor the names of its contributors may be |
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14 | used to endorse or promote products derived from this software without |
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15 | specific prior written permission. |
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16 | |
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17 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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18 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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21 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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22 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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23 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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24 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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25 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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26 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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27 | POSSIBILITY OF SUCH DAMAGE. */ |
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28 | |
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29 | #include <errno.h> |
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30 | |
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31 | /* simple include interface to EPIPHANY trap instruction. */ |
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32 | |
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33 | /* |
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34 | * The simulator uses a trap instruction to escape to the simulator to do file i/o |
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35 | */ |
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36 | |
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37 | /* trapcode r0 r1 r2 */ |
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38 | #define TRAP_write 0 /* channel addr len */ |
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39 | #define TRAP_read 1 /* channel addr len */ |
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40 | #define TRAP_open 2 /* filepath mode */ |
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41 | #define TRAP_exit 3 /* status */ |
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42 | #define TRAP_pass 4 /* - */ |
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43 | #define TRAP_fail 5 /* - */ |
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44 | #define TRAP_close 6 /* channel */ |
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45 | #define TRAP_other 7 /* subcode r1 r2 */ |
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46 | |
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47 | |
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48 | #include "epiphany-syscalls.h" |
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49 | |
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50 | |
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51 | /* prototypical inline asm */ |
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52 | int __attribute__ ((section ("libgloss_epiphany"))) asm_write (int CHAN, void* ADDR, int LEN) |
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53 | { |
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54 | register int chan asm("r0") = CHAN; |
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55 | register void* addr asm("r1") = ADDR; |
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56 | register int len asm("r2") = LEN; |
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57 | register int result asm("r0"); |
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58 | register int error asm("r3"); |
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59 | asm ("trap 0" : "=r" (result), "=r" (error) : |
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60 | "r" (chan), "r" (addr), "r" (len)); |
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61 | if (error) |
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62 | errno = error; |
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63 | return result; |
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64 | } |
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65 | |
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66 | int __attribute__ ((section ("libgloss_epiphany"))) asm_read(int CHAN, void *ADDR, int LEN) |
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67 | { |
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68 | register int chan asm("r0") = CHAN; |
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69 | register void* addr asm("r1") = ADDR; |
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70 | register int len asm("r2") = LEN; |
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71 | register int result asm("r0"); |
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72 | register int error asm("r3"); |
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73 | asm ("trap 1" : "=r" (result), "=r" (error) : |
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74 | "r" (chan), "r" (addr), "r" (len)); |
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75 | if (error) |
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76 | errno = error; |
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77 | return result; |
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78 | } |
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79 | |
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80 | |
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81 | int __attribute__ ((section ("libgloss_epiphany"))) |
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82 | asm_open(const char* FILE, int FLAGS, int MODE) |
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83 | { |
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84 | register const char* file asm("r0") = FILE; |
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85 | register int flags asm("r1") = FLAGS; |
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86 | register int result asm("r0"); |
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87 | register int error asm("r3"); |
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88 | asm ("trap 2" : "=r" (result), "=r" (error) : "r" (file), "r" (flags)); |
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89 | if (error) |
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90 | errno = error; |
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91 | return result; |
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92 | } |
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93 | |
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94 | void __attribute__ ((section ("libgloss_epiphany"))) asm_exit(int STATUS) |
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95 | { |
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96 | register int status asm("r0") = STATUS; |
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97 | asm("trap 3" :: "r" (status)); |
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98 | } |
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99 | |
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100 | int __attribute__ ((section ("libgloss_epiphany"))) asm_close(int CHAN) |
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101 | { |
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102 | register int chan asm("r0") = CHAN; |
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103 | register int result asm("r0"); |
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104 | register int error asm("r3"); |
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105 | asm ("trap 6" : "=r" (result), "=r" (error) : "r" (chan)); |
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106 | if (error) |
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107 | errno = error; |
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108 | return result; |
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109 | } |
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110 | |
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111 | int __attribute__ ((section ("libgloss_epiphany"))) asm_syscall(void *P1,void *P2, void *P3, int SUBFUN) |
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112 | { |
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113 | register void* p1 asm("r0") = (void*)P1; |
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114 | register void* p2 asm("r1") = (void*)P2; |
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115 | register void* p3 asm("r2") = (void*)P3; |
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116 | register int result asm("r0"); |
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117 | register int subfun asm("r3") = SUBFUN; |
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118 | register int error asm("r3"); |
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119 | asm ("trap 7" : "=r" (result), "=r" (error) : |
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120 | "r" (p1), "r" (p2), "r" (p3), "r" (subfun)); |
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121 | if (error) |
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122 | errno = error; |
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123 | return result; |
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124 | } |
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125 | |
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126 | /* |
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127 | * Signal functions implementation |
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128 | * |
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129 | */ |
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130 | |
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131 | #include "epiphany-config.h" |
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132 | |
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133 | |
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134 | #define HW_RESET 0 |
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135 | #define SW_EXCEPTION_IVT_N 1 |
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136 | #define PAGE_MISS_IVT_N 2 |
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137 | #define TIMER0_IVT_N 3 |
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138 | #define TIMER1_IVT_N 4 |
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139 | #define MESSAGE_IVT_N 5 |
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140 | #define DMA0_IVT_N 6 |
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141 | #define DMA1_IVT_N 7 |
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142 | #define WAND_IVT_N 8 |
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143 | #define USR_SOFT_IVT_N 9 |
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144 | |
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145 | |
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146 | typedef void (*sighandler_t)(int); |
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147 | extern sighandler_t ISR_VECTOR[]; |
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148 | extern void DEFAULT_ISR_CALLBACK(); |
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149 | |
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150 | sighandler_t __attribute__ ((section ("libgloss_epiphany"))) signal(int signum, sighandler_t handler) { |
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151 | switch( signum ) |
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152 | { |
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153 | case SIG_DFL /* see signal.h */: |
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154 | //the default is ignore |
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155 | break; |
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156 | case SIG_IGN /* see signal.h */ : |
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157 | DEFAULT_ISR_CALLBACK(); |
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158 | break; |
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159 | case SIG_ERR : |
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160 | asm("trap 5"); |
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161 | break; |
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162 | case SIG_RESET: |
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163 | ISR_VECTOR[HW_RESET] = handler; |
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164 | break; |
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165 | case SIG_SW_EXCEPTION: |
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166 | ISR_VECTOR[SW_EXCEPTION_IVT_N] = handler; |
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167 | break; |
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168 | case SIG_PAGE_MISS: |
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169 | ISR_VECTOR[PAGE_MISS_IVT_N] = handler; |
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170 | break; |
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171 | case SIG_TIMER0: |
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172 | ISR_VECTOR[TIMER0_IVT_N] = handler; |
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173 | break; |
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174 | case SIG_TIMER1: |
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175 | ISR_VECTOR[TIMER1_IVT_N] = handler; |
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176 | break; |
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177 | case SIG_MESSAGE: |
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178 | ISR_VECTOR[MESSAGE_IVT_N] = handler; |
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179 | break; |
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180 | case SIG_DMA0: |
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181 | ISR_VECTOR[DMA0_IVT_N] = handler; |
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182 | break; |
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183 | case SIG_DMA1: |
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184 | ISR_VECTOR[DMA1_IVT_N] = handler; |
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185 | break; |
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186 | case SIG_WAND: |
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187 | ISR_VECTOR[WAND_IVT_N] = handler; |
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188 | break; |
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189 | |
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190 | case SIG_USR1: |
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191 | ISR_VECTOR[USR_SOFT_IVT_N] = handler; |
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192 | break; |
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193 | default: |
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194 | //do nothing |
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195 | return 0; |
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196 | } |
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197 | |
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198 | return 0; |
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199 | } |
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200 | |
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201 | //int e_raise(int signum) __attribute__ ((optimize("O0"))); |
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202 | |
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203 | int __attribute__ ((section ("libgloss_epiphany"))) e_raise(int signum) { |
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204 | |
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205 | //register int imask asm("r4") = 0 ; |
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206 | volatile register int ilatst /*asm("r5") */= signum; |
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207 | |
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208 | switch( signum ) |
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209 | { |
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210 | case SIG_DFL /* see signal.h */: |
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211 | //the default is ignore |
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212 | return 0; |
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213 | case SIG_IGN /* see signal.h */ : |
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214 | //do nothing |
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215 | return 0; |
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216 | case SIG_ERR : |
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217 | |
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218 | return 0; |
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219 | case SIG_RESET: |
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220 | //imask = 1 << HW_RESET; |
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221 | ilatst = 1 << HW_RESET; |
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222 | break; |
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223 | |
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224 | case SIG_SW_EXCEPTION: |
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225 | //imask = 1 << SW_EXCEPTION_IVT_N; |
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226 | ilatst = 1 << SW_EXCEPTION_IVT_N; |
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227 | break; |
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228 | case SIG_PAGE_MISS: |
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229 | //imask = 1 << PAGE_MISS_IVT_N; |
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230 | ilatst = 1 << PAGE_MISS_IVT_N; |
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231 | break; |
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232 | case SIG_TIMER0: |
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233 | //imask = 1 << TIMER0_IVT_N; |
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234 | ilatst = 1 << TIMER0_IVT_N; |
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235 | break; |
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236 | case SIG_TIMER1: |
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237 | //imask = 1 << TIMER1_IVT_N; |
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238 | ilatst = 1 << TIMER1_IVT_N; |
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239 | break; |
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240 | case SIG_MESSAGE: |
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241 | //imask = 1 << MESSAGE_IVT_N; |
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242 | ilatst = 1 << MESSAGE_IVT_N; |
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243 | break; |
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244 | case SIG_DMA0: |
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245 | //imask = 1 << DMA0_IVT_N; |
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246 | ilatst = 1 << DMA0_IVT_N; |
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247 | break; |
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248 | case SIG_DMA1: |
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249 | //imask = 1 << DMA1_IVT_N; |
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250 | ilatst = 1 << DMA1_IVT_N; |
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251 | break; |
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252 | case SIG_WAND: |
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253 | __asm__ __volatile__ ("wand"); |
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254 | //ilatst = 1 << WAND_IVT_N; |
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255 | //break; |
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256 | return; |
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257 | |
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258 | case SIG_USR1: |
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259 | ilatst = 1 << USR_SOFT_IVT_N; |
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260 | break; |
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261 | |
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262 | default: |
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263 | //do nothing |
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264 | return 0; |
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265 | } |
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266 | //asm("movts imask, r4;"); |
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267 | //asm("movts ilatst, r5;"); |
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268 | __asm__ __volatile__ ("movts ilatst, %0" : "=r" (ilatst) : "r" (ilatst)); |
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269 | return 0; |
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270 | |
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271 | } |
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