92 lines
3.9 KiB
C
92 lines
3.9 KiB
C
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/*
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* FreeRTOS Kernel V10.2.1
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* Copyright (C) 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://www.FreeRTOS.org
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* http://aws.amazon.com/freertos
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*
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* 1 tab == 4 spaces!
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*/
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/* Secure context includes. */
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#include "secure_context.h"
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/* Secure port macros. */
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#include "secure_port_macros.h"
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#if( configENABLE_FPU == 1 )
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#error Cortex-M23 does not have a Floating Point Unit (FPU) and therefore configENABLE_FPU must be set to 0.
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#endif
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secureportNON_SECURE_CALLABLE void SecureContext_LoadContext( SecureContextHandle_t xSecureContextHandle )
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{
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/* xSecureContextHandle value is in r0. */
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__asm volatile
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(
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" .syntax unified \n"
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" \n"
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" mrs r1, ipsr \n" /* r1 = IPSR. */
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" cbz r1, load_ctx_therad_mode \n" /* Do nothing if the processor is running in the Thread Mode. */
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" ldmia r0!, {r1, r2} \n" /* r1 = xSecureContextHandle->pucCurrentStackPointer, r2 = xSecureContextHandle->pucStackLimit. */
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#if( configENABLE_MPU == 1 )
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" ldmia r1!, {r3} \n" /* Read CONTROL register value from task's stack. r3 = CONTROL. */
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" msr control, r3 \n" /* CONTROL = r3. */
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#endif /* configENABLE_MPU */
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" msr psplim, r2 \n" /* PSPLIM = r2. */
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" msr psp, r1 \n" /* PSP = r1. */
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" \n"
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" load_ctx_therad_mode: \n"
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" nop \n"
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" \n"
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:::"r0", "r1", "r2"
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);
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}
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/*-----------------------------------------------------------*/
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secureportNON_SECURE_CALLABLE void SecureContext_SaveContext( SecureContextHandle_t xSecureContextHandle )
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{
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/* xSecureContextHandle value is in r0. */
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__asm volatile
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(
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" .syntax unified \n"
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" \n"
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" mrs r1, ipsr \n" /* r1 = IPSR. */
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" cbz r1, save_ctx_therad_mode \n" /* Do nothing if the processor is running in the Thread Mode. */
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" mrs r1, psp \n" /* r1 = PSP. */
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#if( configENABLE_MPU == 1 )
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" mrs r2, control \n" /* r2 = CONTROL. */
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" subs r1, r1, #4 \n" /* Make space for the CONTROL value on the stack. */
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" str r1, [r0] \n" /* Save the top of stack in context. xSecureContextHandle->pucCurrentStackPointer = r1. */
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" stmia r1!, {r2} \n" /* Store CONTROL value on the stack. */
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#else /* configENABLE_MPU */
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" str r1, [r0] \n" /* Save the top of stack in context. xSecureContextHandle->pucCurrentStackPointer = r1. */
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#endif /* configENABLE_MPU */
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" movs r1, %0 \n" /* r1 = securecontextNO_STACK. */
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" msr psplim, r1 \n" /* PSPLIM = securecontextNO_STACK. */
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" msr psp, r1 \n" /* PSP = securecontextNO_STACK i.e. No stack for thread mode until next task's context is loaded. */
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" \n"
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" save_ctx_therad_mode: \n"
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" nop \n"
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" \n"
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:: "i" ( securecontextNO_STACK ) : "r1", "memory"
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);
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}
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/*-----------------------------------------------------------*/
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