2 * FreeRTOS Kernel V10.3.0
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3 * Copyright (C) 2020 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.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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30 /* Variables and functions. */
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31 .extern ullMaxAPIPriorityMask
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32 .extern pxCurrentTCB
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33 .extern vTaskSwitchContext
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34 .extern vApplicationIRQHandler
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35 .extern ullPortInterruptNesting
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36 .extern ullPortTaskHasFPUContext
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37 .extern ullCriticalNesting
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38 .extern ullPortYieldRequired
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41 .extern _freertos_vector_table
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43 .global FreeRTOS_IRQ_Handler
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44 .global FreeRTOS_SWI_Handler
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45 .global vPortRestoreTaskContext
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48 .macro portSAVE_CONTEXT
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50 /* Switch to use the EL0 stack pointer. */
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53 /* Save the entire context. */
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54 STP X0, X1, [SP, #-0x10]!
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55 STP X2, X3, [SP, #-0x10]!
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56 STP X4, X5, [SP, #-0x10]!
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57 STP X6, X7, [SP, #-0x10]!
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58 STP X8, X9, [SP, #-0x10]!
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59 STP X10, X11, [SP, #-0x10]!
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60 STP X12, X13, [SP, #-0x10]!
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61 STP X14, X15, [SP, #-0x10]!
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62 STP X16, X17, [SP, #-0x10]!
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63 STP X18, X19, [SP, #-0x10]!
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64 STP X20, X21, [SP, #-0x10]!
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65 STP X22, X23, [SP, #-0x10]!
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66 STP X24, X25, [SP, #-0x10]!
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67 STP X26, X27, [SP, #-0x10]!
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68 STP X28, X29, [SP, #-0x10]!
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69 STP X30, XZR, [SP, #-0x10]!
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71 /* Save the SPSR. */
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72 #if defined( GUEST )
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81 STP X2, X3, [SP, #-0x10]!
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83 /* Save the critical section nesting depth. */
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84 LDR X0, ullCriticalNestingConst
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87 /* Save the FPU context indicator. */
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88 LDR X0, ullPortTaskHasFPUContextConst
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91 /* Save the FPU context, if any (32 128-bit registers). */
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94 STP Q0, Q1, [SP,#-0x20]!
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95 STP Q2, Q3, [SP,#-0x20]!
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96 STP Q4, Q5, [SP,#-0x20]!
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97 STP Q6, Q7, [SP,#-0x20]!
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98 STP Q8, Q9, [SP,#-0x20]!
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99 STP Q10, Q11, [SP,#-0x20]!
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100 STP Q12, Q13, [SP,#-0x20]!
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101 STP Q14, Q15, [SP,#-0x20]!
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102 STP Q16, Q17, [SP,#-0x20]!
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103 STP Q18, Q19, [SP,#-0x20]!
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104 STP Q20, Q21, [SP,#-0x20]!
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105 STP Q22, Q23, [SP,#-0x20]!
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106 STP Q24, Q25, [SP,#-0x20]!
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107 STP Q26, Q27, [SP,#-0x20]!
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108 STP Q28, Q29, [SP,#-0x20]!
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109 STP Q30, Q31, [SP,#-0x20]!
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112 /* Store the critical nesting count and FPU context indicator. */
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113 STP X2, X3, [SP, #-0x10]!
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115 LDR X0, pxCurrentTCBConst
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117 MOV X0, SP /* Move SP into X0 for saving. */
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120 /* Switch to use the ELx stack pointer. */
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125 ; /**********************************************************************/
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127 .macro portRESTORE_CONTEXT
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129 /* Switch to use the EL0 stack pointer. */
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132 /* Set the SP to point to the stack of the task being restored. */
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133 LDR X0, pxCurrentTCBConst
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138 LDP X2, X3, [SP], #0x10 /* Critical nesting and FPU context. */
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140 /* Set the PMR register to be correct for the current critical nesting
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142 LDR X0, ullCriticalNestingConst /* X0 holds the address of ullCriticalNesting. */
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143 MOV X1, #255 /* X1 holds the unmask value. */
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144 LDR X4, ullICCPMRConst /* X4 holds the address of the ICCPMR constant. */
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146 LDR X5, [X4] /* X5 holds the address of the ICCPMR register. */
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148 LDR X6, ullMaxAPIPriorityMaskConst
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149 LDR X1, [X6] /* X1 holds the mask value. */
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151 STR W1, [X5] /* Write the mask value to ICCPMR. */
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152 DSB SY /* _RB_Barriers probably not required here. */
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154 STR X3, [X0] /* Restore the task's critical nesting count. */
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156 /* Restore the FPU context indicator. */
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157 LDR X0, ullPortTaskHasFPUContextConst
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160 /* Restore the FPU context, if any. */
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163 LDP Q30, Q31, [SP], #0x20
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164 LDP Q28, Q29, [SP], #0x20
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165 LDP Q26, Q27, [SP], #0x20
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166 LDP Q24, Q25, [SP], #0x20
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167 LDP Q22, Q23, [SP], #0x20
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168 LDP Q20, Q21, [SP], #0x20
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169 LDP Q18, Q19, [SP], #0x20
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170 LDP Q16, Q17, [SP], #0x20
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171 LDP Q14, Q15, [SP], #0x20
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172 LDP Q12, Q13, [SP], #0x20
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173 LDP Q10, Q11, [SP], #0x20
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174 LDP Q8, Q9, [SP], #0x20
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175 LDP Q6, Q7, [SP], #0x20
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176 LDP Q4, Q5, [SP], #0x20
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177 LDP Q2, Q3, [SP], #0x20
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178 LDP Q0, Q1, [SP], #0x20
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180 LDP X2, X3, [SP], #0x10 /* SPSR and ELR. */
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182 #if defined( GUEST )
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183 /* Restore the SPSR. */
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185 /* Restore the ELR. */
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188 /* Restore the SPSR. */
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189 MSR SPSR_EL3, X3 /*_RB_ Assumes started in EL3. */
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190 /* Restore the ELR. */
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194 LDP X30, XZR, [SP], #0x10
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195 LDP X28, X29, [SP], #0x10
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196 LDP X26, X27, [SP], #0x10
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197 LDP X24, X25, [SP], #0x10
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198 LDP X22, X23, [SP], #0x10
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199 LDP X20, X21, [SP], #0x10
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200 LDP X18, X19, [SP], #0x10
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201 LDP X16, X17, [SP], #0x10
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202 LDP X14, X15, [SP], #0x10
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203 LDP X12, X13, [SP], #0x10
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204 LDP X10, X11, [SP], #0x10
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205 LDP X8, X9, [SP], #0x10
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206 LDP X6, X7, [SP], #0x10
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207 LDP X4, X5, [SP], #0x10
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208 LDP X2, X3, [SP], #0x10
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209 LDP X0, X1, [SP], #0x10
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211 /* Switch to use the ELx stack pointer. _RB_ Might not be required. */
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219 /******************************************************************************
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220 * FreeRTOS_SWI_Handler handler is used to perform a context switch.
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221 *****************************************************************************/
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223 .type FreeRTOS_SWI_Handler, %function
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224 FreeRTOS_SWI_Handler:
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225 /* Save the context of the current task and select a new task to run. */
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227 #if defined( GUEST )
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235 #if defined( GUEST )
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236 CMP X1, #0x15 /* 0x15 = SVC instruction. */
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238 CMP X1, #0x17 /* 0x17 = SMC instruction. */
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240 B.NE FreeRTOS_Abort
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241 BL vTaskSwitchContext
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243 portRESTORE_CONTEXT
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246 /* Full ESR is in X0, exception class code is in X1. */
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249 /******************************************************************************
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250 * vPortRestoreTaskContext is used to start the scheduler.
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251 *****************************************************************************/
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253 .type vPortRestoreTaskContext, %function
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254 vPortRestoreTaskContext:
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255 .set freertos_vector_base, _freertos_vector_table
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257 /* Install the FreeRTOS interrupt handlers. */
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258 LDR X1, =freertos_vector_base
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259 #if defined( GUEST )
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267 /* Start the first task. */
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268 portRESTORE_CONTEXT
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271 /******************************************************************************
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272 * FreeRTOS_IRQ_Handler handles IRQ entry and exit.
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273 *****************************************************************************/
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275 .type FreeRTOS_IRQ_Handler, %function
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276 FreeRTOS_IRQ_Handler:
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277 /* Save volatile registers. */
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278 STP X0, X1, [SP, #-0x10]!
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279 STP X2, X3, [SP, #-0x10]!
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280 STP X4, X5, [SP, #-0x10]!
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281 STP X6, X7, [SP, #-0x10]!
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282 STP X8, X9, [SP, #-0x10]!
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283 STP X10, X11, [SP, #-0x10]!
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284 STP X12, X13, [SP, #-0x10]!
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285 STP X14, X15, [SP, #-0x10]!
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286 STP X16, X17, [SP, #-0x10]!
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287 STP X18, X19, [SP, #-0x10]!
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288 STP X29, X30, [SP, #-0x10]!
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290 /* Save the SPSR and ELR. */
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291 #if defined( GUEST )
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298 STP X2, X3, [SP, #-0x10]!
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300 /* Increment the interrupt nesting counter. */
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301 LDR X5, ullPortInterruptNestingConst
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302 LDR X1, [X5] /* Old nesting count in X1. */
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304 STR X6, [X5] /* Address of nesting count variable in X5. */
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306 /* Maintain the interrupt nesting information across the function call. */
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307 STP X1, X5, [SP, #-0x10]!
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309 /* Read value from the interrupt acknowledge register, which is stored in W0
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310 for future parameter and interrupt clearing use. */
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311 LDR X2, ullICCIARConst
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313 LDR W0, [X3] /* ICCIAR in W0 as parameter. */
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315 /* Maintain the ICCIAR value across the function call. */
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316 STP X0, X1, [SP, #-0x10]!
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318 /* Call the C handler. */
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319 BL vApplicationIRQHandler
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321 /* Disable interrupts. */
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326 /* Restore the ICCIAR value. */
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327 LDP X0, X1, [SP], #0x10
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329 /* End IRQ processing by writing ICCIAR to the EOI register. */
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330 LDR X4, ullICCEOIRConst
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334 /* Restore the critical nesting count. */
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335 LDP X1, X5, [SP], #0x10
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338 /* Has interrupt nesting unwound? */
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340 B.NE Exit_IRQ_No_Context_Switch
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342 /* Is a context switch required? */
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343 LDR X0, ullPortYieldRequiredConst
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346 B.EQ Exit_IRQ_No_Context_Switch
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348 /* Reset ullPortYieldRequired to 0. */
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352 /* Restore volatile registers. */
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353 LDP X4, X5, [SP], #0x10 /* SPSR and ELR. */
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354 #if defined( GUEST )
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358 MSR SPSR_EL3, X5 /*_RB_ Assumes started in EL3. */
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364 LDP X29, X30, [SP], #0x10
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365 LDP X18, X19, [SP], #0x10
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366 LDP X16, X17, [SP], #0x10
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367 LDP X14, X15, [SP], #0x10
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368 LDP X12, X13, [SP], #0x10
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369 LDP X10, X11, [SP], #0x10
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370 LDP X8, X9, [SP], #0x10
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371 LDP X6, X7, [SP], #0x10
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372 LDP X4, X5, [SP], #0x10
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373 LDP X2, X3, [SP], #0x10
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374 LDP X0, X1, [SP], #0x10
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376 /* Save the context of the current task and select a new task to run. */
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378 BL vTaskSwitchContext
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379 portRESTORE_CONTEXT
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381 Exit_IRQ_No_Context_Switch:
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382 /* Restore volatile registers. */
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383 LDP X4, X5, [SP], #0x10 /* SPSR and ELR. */
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384 #if defined( GUEST )
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388 MSR SPSR_EL3, X5 /*_RB_ Assumes started in EL3. */
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394 LDP X29, X30, [SP], #0x10
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395 LDP X18, X19, [SP], #0x10
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396 LDP X16, X17, [SP], #0x10
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397 LDP X14, X15, [SP], #0x10
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398 LDP X12, X13, [SP], #0x10
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399 LDP X10, X11, [SP], #0x10
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400 LDP X8, X9, [SP], #0x10
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401 LDP X6, X7, [SP], #0x10
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402 LDP X4, X5, [SP], #0x10
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403 LDP X2, X3, [SP], #0x10
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404 LDP X0, X1, [SP], #0x10
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412 pxCurrentTCBConst: .dword pxCurrentTCB
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413 ullCriticalNestingConst: .dword ullCriticalNesting
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414 ullPortTaskHasFPUContextConst: .dword ullPortTaskHasFPUContext
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416 ullICCPMRConst: .dword ullICCPMR
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417 ullMaxAPIPriorityMaskConst: .dword ullMaxAPIPriorityMask
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418 vApplicationIRQHandlerConst: .word vApplicationIRQHandler
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419 ullPortInterruptNestingConst: .dword ullPortInterruptNesting
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420 ullPortYieldRequiredConst: .dword ullPortYieldRequired
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421 ullICCIARConst: .dword ullICCIAR
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422 ullICCEOIRConst: .dword ullICCEOIR
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