2 ; * FreeRTOS Kernel V10.0.0
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3 ; * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 ; * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 ; * this software and associated documentation files (the "Software"), to deal in
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7 ; * the Software without restriction, including without limitation the rights to
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8 ; * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 ; * the Software, and to permit persons to whom the Software is furnished to do so,
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10 ; * subject to the following conditions:
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12 ; * The above copyright notice and this permission notice shall be included in all
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13 ; * copies or substantial portions of the Software. If you wish to use our Amazon
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14 ; * FreeRTOS name, please do so in a fair use way that does not cause confusion.
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16 ; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 ; * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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18 ; * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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19 ; * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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20 ; * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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21 ; * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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23 ; * http://www.FreeRTOS.org
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24 ; * http://aws.amazon.com/freertos
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26 ; * 1 tab == 4 spaces!
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30 .extern pxCurrentTCB
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31 .extern vTaskSwitchContext
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32 .extern ulMaxSyscallInterruptPriorityConst
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35 .global _lc_ref__vector_pp_14
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37 .global vPortStartFirstTask
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38 .global vPortEnableVFP
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39 .global ulPortSetInterruptMask
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40 .global vPortClearInterruptMask
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42 ;-----------------------------------------------------------
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47 _vector_14: .type func
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52 ;Get the location of the current TCB.
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53 ldr.w r3, =pxCurrentTCB
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56 ;Is the task using the FPU context? If so, push high vfp registers.
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59 vstmdbeq r0!, {s16-s31}
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61 ;Save the core registers.
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62 stmdb r0!, {r4-r11, r14}
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64 ;Save the new top of stack into the first member of the TCB.
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68 ldr.w r0, =ulMaxSyscallInterruptPriorityConst
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71 bl vTaskSwitchContext
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76 ;The first item in pxCurrentTCB is the task top of stack.
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80 ;Pop the core registers.
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81 ldmia r0!, {r4-r11, r14}
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83 ;Is the task using the FPU context? If so, pop the high vfp registers too.
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86 vldmiaeq r0!, {s16-s31}
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92 .size _vector_14, $-_vector_14
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95 ;-----------------------------------------------------------
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97 ; This function is an XMC4000 silicon errata workaround. It will get used when
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98 ; the SILICON_BUG_PMC_CM_001 linker macro is defined.
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102 _lc_ref__vector_pp_14: .type func
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107 ;Get the location of the current TCB.
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108 ldr.w r3, =pxCurrentTCB
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111 ;Is the task using the FPU context? If so, push high vfp registers.
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114 vstmdbeq r0!, {s16-s31}
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116 ;Save the core registers.
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117 stmdb r0!, {r4-r11, r14}
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119 ;Save the new top of stack into the first member of the TCB.
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123 ldr.w r0, =ulMaxSyscallInterruptPriorityConst
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126 bl vTaskSwitchContext
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131 ;The first item in pxCurrentTCB is the task top of stack.
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135 ;Pop the core registers.
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136 ldmia r0!, {r4-r11, r14}
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138 ;Is the task using the FPU context? If so, pop the high vfp registers too.
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141 vldmiaeq r0!, {s16-s31}
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146 pop { pc } ; XMC4000 specific errata workaround. Do not used "bx lr" here.
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148 .size _lc_ref__vector_pp_14, $-_lc_ref__vector_pp_14
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151 ;-----------------------------------------------------------
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156 SVC_Handler: .type func
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157 ;Get the location of the current TCB.
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158 ldr.w r3, =pxCurrentTCB
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161 ;Pop the core registers.
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162 ldmia r0!, {r4-r11, r14}
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168 .size SVC_Handler, $-SVC_Handler
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171 ;-----------------------------------------------------------
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176 vPortStartFirstTask .type func
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177 ;Use the NVIC offset register to locate the stack.
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178 ldr.w r0, =0xE000ED08
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181 ;Set the msp back to the start of the stack.
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183 ;Call SVC to start the first task.
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189 .size vPortStartFirstTask, $-vPortStartFirstTask
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192 ;-----------------------------------------------------------
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197 vPortEnableVFP .type func
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198 ;The FPU enable bits are in the CPACR.
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199 ldr.w r0, =0xE000ED88
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202 ;Enable CP10 and CP11 coprocessors, then save back.
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203 orr r1, r1, #( 0xf << 20 )
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206 .size vPortEnableVFP, $-vPortEnableVFP
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209 ;-----------------------------------------------------------
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214 ulPortSetInterruptMask:
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216 ldr.w r1, =ulMaxSyscallInterruptPriorityConst
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220 .size ulPortSetInterruptMask, $-ulPortSetInterruptMask
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223 ;-----------------------------------------------------------
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228 vPortClearInterruptMask:
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231 .size vPortClearInterruptMask, $-vPortClearInterruptMask
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234 ;-----------------------------------------------------------
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