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annotate syscalls.c @ 15:b12881051261

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Use corrected delay() routine. Add note about timing oddities (but it works, so..)
author Daniel O'Connor <darius@dons.net.au>
date Wed, 14 Nov 2012 12:24:44 +1030
parents 74e9b3baac1e
children 2bce4dbf52b8
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1 /*
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2 * syscalls.c
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3 *
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4 * Created on: 03.12.2009
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5 * Author: Martin Thomas, 3BSD license
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6 */
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7
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8 #include <stdio.h>
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9 #include <reent.h>
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10 #include <errno.h>
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11 #include <stdlib.h> /* abort */
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12 #include <sys/types.h>
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13 #include <sys/stat.h>
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14 #include <sys/time.h>
0
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15
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16 #include "comm.h"
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17 #include "stm32f10x.h" /* for _get_PSP() from core_cm3.h*/
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18
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19 #undef errno
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20 extern int errno;
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21
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22 int
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23 _kill(int pid, int sig) {
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24 pid = pid; sig = sig; /* avoid warnings */
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25 errno = EINVAL;
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26 return -1;
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27 }
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28
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29 void
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30 _exit(int status) {
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31 printf("_exit called with parameter %d\n", status);
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32 while(1)
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33 ;
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34 }
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35
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36 int
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37 _getpid(void) {
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38 return 1;
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39 }
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40
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41 extern char _end; /* Defined by the linker */
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42 static char *heap_end;
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43
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44 char *
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45 get_heap_end(void) {
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46 return (char*) heap_end;
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47 }
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48
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49 char *
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50 get_stack_top(void) {
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51 /* Use MSP (vs PSP) - the processor is in Thread mode out of reset */
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52 return (char*) __get_MSP();
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53 }
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54
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55 caddr_t
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56 _sbrk(int incr) {
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57 char *prev_heap_end;
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58
0
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59 if (heap_end == 0) {
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60 heap_end = &_end;
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61 }
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62 prev_heap_end = heap_end;
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63
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64 if (heap_end + incr > get_stack_top()) {
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65 printf("Heap and stack collision\n");
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66 abort();
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67 }
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68
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69 heap_end += incr;
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70 return (caddr_t) prev_heap_end;
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71 }
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72
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73 int
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74 _close(int file) {
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75 file = file; /* avoid warning */
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76 return -1;
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77 }
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78
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79 int
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80 _fstat(int file, struct stat *st) {
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81 file = file; /* avoid warning */
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82 st->st_mode = S_IFCHR;
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83 return 0;
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84 }
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85
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86 int
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87 _isatty(int file) {
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88 file = file; /* avoid warning */
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89 return 1;
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90 }
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91
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92 int
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93 _lseek(int file, int ptr, int dir) {
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94 file = file; /* avoid warning */
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95 ptr = ptr; /* avoid warning */
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96 dir = dir; /* avoid warning */
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97 return 0;
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98 }
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99
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100 int
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101 _read(int file, char *ptr, int len) {
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102 file = file; /* avoid warning */
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103 ptr = ptr; /* avoid warning */
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104 len = len; /* avoid warning */
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105 return 0;
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106 }
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107
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108 int
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109 _write(int file, char *ptr, int len) {
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110 int todo;
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111
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112 file = file; /* avoid warning */
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113 for (todo = 0; todo < len; todo++) {
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114 comm_put(*ptr++);
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115 }
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116 return len;
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117 }
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118
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119 int
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120 _gettimeofday_r(struct _reent *reent __attribute__((unused)), struct timeval *tp, void *tzp __attribute__((unused))) {
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121 tp->tv_sec = RTC_GetCounter();
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122 tp->tv_usec = 0;
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123
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124 return 0;
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125 }
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126
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127 int
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128 settimeofday(const struct timeval *tp, const struct timezone *tzp __attribute__((unused))) {
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129 RTC_SetCounter(tp->tv_sec);
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130
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131 return 0;
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132 }
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133
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134 clock_t
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135 _clock (void) {
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136 return RTC_GetCounter();
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137 }
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138
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139 void
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140 __tz_lock (void) {
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141 }
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142
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143
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144 void
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145 __tz_unlock (void) {
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146 }
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147
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148 static __tzinfo_type tzinfo = {1, 0,
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149 { {'J', 0, 0, 0, 0, (time_t)0, 0L },
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150 {'J', 0, 0, 0, 0, (time_t)0, 0L }
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151 }
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152 };
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153
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154 __tzinfo_type *
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155 __gettzinfo (void) {
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156 return &tzinfo;
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157 }
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158
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159 /* Stub, required for strftime?! */
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160 int
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161 _open(const char *name __attribute__((unused)), int mode __attribute__((unused)), ...) {
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162 return -1;
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163 }