| /* |
| * FreeRTOS Kernel V10.3.0 |
| * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy of |
| * this software and associated documentation files (the "Software"), to deal in |
| * the Software without restriction, including without limitation the rights to |
| * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of |
| * the Software, and to permit persons to whom the Software is furnished to do so, |
| * subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in all |
| * copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS |
| * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR |
| * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER |
| * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * http://www.FreeRTOS.org |
| * http://aws.amazon.com/freertos |
| * |
| * 1 tab == 4 spaces! |
| */ |
| |
| SECTION .text:CODE:NOROOT(2) |
| THUMB |
| |
| PUBLIC SecureContext_LoadContextAsm |
| PUBLIC SecureContext_SaveContextAsm |
| /*-----------------------------------------------------------*/ |
| |
| SecureContext_LoadContextAsm: |
| /* xSecureContextHandle value is in r0. */ |
| mrs r1, ipsr /* r1 = IPSR. */ |
| cbz r1, load_ctx_therad_mode /* Do nothing if the processor is running in the Thread Mode. */ |
| ldmia r0!, {r1, r2} /* r1 = xSecureContextHandle->pucCurrentStackPointer, r2 = xSecureContextHandle->pucStackLimit. */ |
| #if ( configENABLE_MPU == 1 ) |
| ldmia r1!, {r3} /* Read CONTROL register value from task's stack. r3 = CONTROL. */ |
| msr control, r3 /* CONTROL = r3. */ |
| #endif /* configENABLE_MPU */ |
| msr psplim, r2 /* PSPLIM = r2. */ |
| msr psp, r1 /* PSP = r1. */ |
| |
| load_ctx_therad_mode: |
| bx lr |
| /*-----------------------------------------------------------*/ |
| |
| SecureContext_SaveContextAsm: |
| /* xSecureContextHandle value is in r0. */ |
| mrs r1, ipsr /* r1 = IPSR. */ |
| cbz r1, save_ctx_therad_mode /* Do nothing if the processor is running in the Thread Mode. */ |
| mrs r1, psp /* r1 = PSP. */ |
| #if ( configENABLE_FPU == 1 ) |
| vstmdb r1!, {s0} /* Trigger the defferred stacking of FPU registers. */ |
| vldmia r1!, {s0} /* Nullify the effect of the pervious statement. */ |
| #endif /* configENABLE_FPU */ |
| #if ( configENABLE_MPU == 1 ) |
| mrs r2, control /* r2 = CONTROL. */ |
| stmdb r1!, {r2} /* Store CONTROL value on the stack. */ |
| #endif /* configENABLE_MPU */ |
| str r1, [r0] /* Save the top of stack in context. xSecureContextHandle->pucCurrentStackPointer = r1. */ |
| movs r1, #0 /* r1 = securecontextNO_STACK. */ |
| msr psplim, r1 /* PSPLIM = securecontextNO_STACK. */ |
| msr psp, r1 /* PSP = securecontextNO_STACK i.e. No stack for thread mode until next task's context is loaded. */ |
| |
| save_ctx_therad_mode: |
| bx lr |
| /*-----------------------------------------------------------*/ |
| |
| END |