1 | /* mbed Microcontroller Library
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2 | * Copyright (c) 2006-2013 ARM Limited
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | */
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16 | #include "cmsis.h"
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17 | #include "platform/mbed_semihost_api.h"
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18 |
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19 | #include <stdint.h>
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20 | #include <string.h>
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21 |
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22 | #if DEVICE_SEMIHOST
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23 |
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24 | // ARM Semihosting Commands
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25 | #define SYS_OPEN (0x1)
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26 | #define SYS_CLOSE (0x2)
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27 | #define SYS_WRITE (0x5)
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28 | #define SYS_READ (0x6)
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29 | #define SYS_ISTTY (0x9)
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30 | #define SYS_SEEK (0xa)
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31 | #define SYS_ENSURE (0xb)
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32 | #define SYS_FLEN (0xc)
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33 | #define SYS_REMOVE (0xe)
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34 | #define SYS_RENAME (0xf)
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35 | #define SYS_EXIT (0x18)
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36 |
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37 | // mbed Semihosting Commands
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38 | #define RESERVED_FOR_USER_APPLICATIONS (0x100) // 0x100 - 0x1ff
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39 | #define USR_XFFIND (RESERVED_FOR_USER_APPLICATIONS + 0)
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40 | #define USR_UID (RESERVED_FOR_USER_APPLICATIONS + 1)
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41 | #define USR_RESET (RESERVED_FOR_USER_APPLICATIONS + 2)
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42 | #define USR_VBUS (RESERVED_FOR_USER_APPLICATIONS + 3)
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43 | #define USR_POWERDOWN (RESERVED_FOR_USER_APPLICATIONS + 4)
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44 | #define USR_DISABLEDEBUG (RESERVED_FOR_USER_APPLICATIONS + 5)
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45 |
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46 | #if DEVICE_LOCALFILESYSTEM
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47 | FILEHANDLE semihost_open(const char* name, int openmode) {
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48 | uint32_t args[3];
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49 | args[0] = (uint32_t)name;
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50 | args[1] = (uint32_t)openmode;
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51 | args[2] = (uint32_t)strlen(name);
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52 | return __semihost(SYS_OPEN, args);
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53 | }
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54 |
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55 | int semihost_close(FILEHANDLE fh) {
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56 | return __semihost(SYS_CLOSE, &fh);
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57 | }
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58 |
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59 | int semihost_write(FILEHANDLE fh, const unsigned char* buffer, unsigned int length, int mode) {
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60 | if (length == 0) return 0;
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61 |
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62 | uint32_t args[3];
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63 | args[0] = (uint32_t)fh;
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64 | args[1] = (uint32_t)buffer;
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65 | args[2] = (uint32_t)length;
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66 | return __semihost(SYS_WRITE, args);
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67 | }
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68 |
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69 | int semihost_read(FILEHANDLE fh, unsigned char* buffer, unsigned int length, int mode) {
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70 | uint32_t args[3];
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71 | args[0] = (uint32_t)fh;
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72 | args[1] = (uint32_t)buffer;
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73 | args[2] = (uint32_t)length;
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74 | return __semihost(SYS_READ, args);
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75 | }
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76 |
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77 | int semihost_istty(FILEHANDLE fh) {
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78 | return __semihost(SYS_ISTTY, &fh);
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79 | }
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80 |
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81 | int semihost_seek(FILEHANDLE fh, long position) {
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82 | uint32_t args[2];
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83 | args[0] = (uint32_t)fh;
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84 | args[1] = (uint32_t)position;
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85 | return __semihost(SYS_SEEK, args);
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86 | }
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87 |
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88 | int semihost_ensure(FILEHANDLE fh) {
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89 | return __semihost(SYS_ENSURE, &fh);
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90 | }
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91 |
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92 | long semihost_flen(FILEHANDLE fh) {
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93 | return __semihost(SYS_FLEN, &fh);
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94 | }
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95 |
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96 | int semihost_remove(const char *name) {
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97 | uint32_t args[2];
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98 | args[0] = (uint32_t)name;
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99 | args[1] = (uint32_t)strlen(name);
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100 | return __semihost(SYS_REMOVE, args);
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101 | }
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102 |
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103 | int semihost_rename(const char *old_name, const char *new_name) {
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104 | uint32_t args[4];
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105 | args[0] = (uint32_t)old_name;
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106 | args[1] = (uint32_t)strlen(old_name);
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107 | args[0] = (uint32_t)new_name;
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108 | args[1] = (uint32_t)strlen(new_name);
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109 | return __semihost(SYS_RENAME, args);
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110 | }
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111 | #endif
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112 |
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113 | int semihost_exit(void) {
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114 | uint32_t args[4];
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115 | return __semihost(SYS_EXIT, args);
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116 | }
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117 |
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118 | int semihost_uid(char *uid) {
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119 | uint32_t args[2];
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120 | args[0] = (uint32_t)uid;
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121 | args[1] = DEVICE_ID_LENGTH + 1;
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122 | return __semihost(USR_UID, &args);
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123 | }
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124 |
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125 | int semihost_reset(void) {
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126 | // Does not normally return, however if used with older firmware versions
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127 | // that do not support this call it will return -1.
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128 | return __semihost(USR_RESET, NULL);
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129 | }
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130 |
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131 | int semihost_vbus(void) {
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132 | return __semihost(USR_VBUS, NULL);
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133 | }
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134 |
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135 | int semihost_powerdown(void) {
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136 | return __semihost(USR_POWERDOWN, NULL);
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137 | }
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138 |
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139 | #if DEVICE_DEBUG_AWARENESS
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140 |
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141 | int semihost_connected(void) {
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142 | return (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ? 1 : 0;
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143 | }
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144 |
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145 | #else
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146 | // These processors cannot know if the interface is connect, assume so:
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147 | static int is_debugger_attached = 1;
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148 |
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149 | int semihost_connected(void) {
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150 | return is_debugger_attached;
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151 | }
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152 | #endif
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153 |
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154 | int semihost_disabledebug(void) {
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155 | uint32_t args[1];
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156 | #if !(DEVICE_DEBUG_AWARENESS)
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157 | is_debugger_attached = 0;
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158 | #endif
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159 | return __semihost(USR_DISABLEDEBUG, &args);
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160 | }
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161 |
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162 | #endif
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163 |
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