2 * FreeRTOS Kernel V10.3.0
\r
3 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
\r
5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
\r
6 * this software and associated documentation files (the "Software"), to deal in
\r
7 * the Software without restriction, including without limitation the rights to
\r
8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
\r
9 * the Software, and to permit persons to whom the Software is furnished to do so,
\r
10 * subject to the following conditions:
\r
12 * The above copyright notice and this permission notice shall be included in all
\r
13 * copies or substantial portions of the Software.
\r
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
\r
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
\r
17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
\r
18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
\r
19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
\r
20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\r
22 * http://www.FreeRTOS.org
\r
23 * http://aws.amazon.com/freertos
\r
25 * 1 tab == 4 spaces!
\r
28 /* Secure context includes. */
\r
29 #include "secure_context.h"
\r
31 /* Secure port macros. */
\r
32 #include "secure_port_macros.h"
\r
34 #if( configENABLE_FPU == 1 )
\r
35 #error Cortex-M23 does not have a Floating Point Unit (FPU) and therefore configENABLE_FPU must be set to 0.
\r
38 secureportNON_SECURE_CALLABLE void SecureContext_LoadContext( SecureContextHandle_t xSecureContextHandle )
\r
40 /* xSecureContextHandle value is in r0. */
\r
43 " .syntax unified \n"
\r
45 " mrs r1, ipsr \n" /* r1 = IPSR. */
\r
46 " cbz r1, load_ctx_therad_mode \n" /* Do nothing if the processor is running in the Thread Mode. */
\r
47 " ldmia r0!, {r1, r2} \n" /* r1 = xSecureContextHandle->pucCurrentStackPointer, r2 = xSecureContextHandle->pucStackLimit. */
\r
48 #if( configENABLE_MPU == 1 )
\r
49 " ldmia r1!, {r3} \n" /* Read CONTROL register value from task's stack. r3 = CONTROL. */
\r
50 " msr control, r3 \n" /* CONTROL = r3. */
\r
51 #endif /* configENABLE_MPU */
\r
52 " msr psplim, r2 \n" /* PSPLIM = r2. */
\r
53 " msr psp, r1 \n" /* PSP = r1. */
\r
55 " load_ctx_therad_mode: \n"
\r
61 /*-----------------------------------------------------------*/
\r
63 secureportNON_SECURE_CALLABLE void SecureContext_SaveContext( SecureContextHandle_t xSecureContextHandle )
\r
65 /* xSecureContextHandle value is in r0. */
\r
68 " .syntax unified \n"
\r
70 " mrs r1, ipsr \n" /* r1 = IPSR. */
\r
71 " cbz r1, save_ctx_therad_mode \n" /* Do nothing if the processor is running in the Thread Mode. */
\r
72 " mrs r1, psp \n" /* r1 = PSP. */
\r
73 #if( configENABLE_MPU == 1 )
\r
74 " mrs r2, control \n" /* r2 = CONTROL. */
\r
75 " subs r1, r1, #4 \n" /* Make space for the CONTROL value on the stack. */
\r
76 " str r1, [r0] \n" /* Save the top of stack in context. xSecureContextHandle->pucCurrentStackPointer = r1. */
\r
77 " stmia r1!, {r2} \n" /* Store CONTROL value on the stack. */
\r
78 #else /* configENABLE_MPU */
\r
79 " str r1, [r0] \n" /* Save the top of stack in context. xSecureContextHandle->pucCurrentStackPointer = r1. */
\r
80 #endif /* configENABLE_MPU */
\r
81 " movs r1, %0 \n" /* r1 = securecontextNO_STACK. */
\r
82 " msr psplim, r1 \n" /* PSPLIM = securecontextNO_STACK. */
\r
83 " msr psp, r1 \n" /* PSP = securecontextNO_STACK i.e. No stack for thread mode until next task's context is loaded. */
\r
85 " save_ctx_therad_mode: \n"
\r
88 :: "i" ( securecontextNO_STACK ) : "r1", "memory"
\r
91 /*-----------------------------------------------------------*/
\r