| /* |
| * FreeRTOS Kernel <DEVELOPMENT BRANCH> |
| * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| * |
| * SPDX-License-Identifier: MIT |
| * |
| * 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. |
| * |
| * https://www.FreeRTOS.org |
| * https://github.com/FreeRTOS |
| * |
| */ |
| |
| /* Standard includes. */ |
| #include <stdint.h> |
| |
| /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE ensures that PRIVILEGED_FUNCTION |
| * is defined correctly and privileged functions are placed in correct sections. */ |
| #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE |
| |
| /* Portasm includes. */ |
| #include "portasm.h" |
| |
| /* System call numbers includes. */ |
| #include "mpu_syscall_numbers.h" |
| |
| /* MPU_WRAPPERS_INCLUDED_FROM_API_FILE is needed to be defined only for the |
| * header files. */ |
| #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE |
| |
| #if ( configENABLE_MPU == 1 ) |
| |
| void vRestoreContextOfFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */ |
| { |
| __asm volatile |
| ( |
| " .extern pxCurrentTCB \n" |
| " .syntax unified \n" |
| " \n" |
| " program_mpu_first_task: \n" |
| " \n" |
| " ldr r3, =pxCurrentTCB \n" /* r3 = &pxCurrentTCB. */ |
| " ldr r0, [r3] \n" /* r0 = pxCurrentTCB.*/ |
| " adds r0, #4 \n" /* r0 = Second item in the TCB which is xMPUSettings. */ |
| " \n" |
| " dmb \n" /* Complete outstanding transfers before disabling MPU. */ |
| " ldr r1, =0xe000ed94 \n" /* r1 = 0xe000ed94 [Location of MPU_CTRL]. */ |
| " ldr r2, [r1] \n" /* Read the value of MPU_CTRL. */ |
| " movs r3, #1 \n" /* r3 = 1. */ |
| " bics r2, r3 \n" /* r2 = r2 & ~r3 i.e. Clear the bit 0 in r2. */ |
| " str r2, [r1] \n" /* Disable MPU. */ |
| " \n" |
| " ldr r1, =0xe000ed9c \n" /* r1 = 0xe000ed9c [Location of RBAR]. */ |
| " ldr r2, =0xe000eda0 \n" /* r2 = 0xe000eda0 [Location of RASR]. */ |
| " \n" |
| " ldmia r0!, {r3-r4} \n" /* Read first set of RBAR/RASR registers from TCB. */ |
| " str r3, [r1] \n" /* Program RBAR. */ |
| " str r4, [r2] \n" /* Program RASR. */ |
| " \n" |
| " ldmia r0!, {r3-r4} \n" /* Read second set of RBAR/RASR registers from TCB. */ |
| " str r3, [r1] \n" /* Program RBAR. */ |
| " str r4, [r2] \n" /* Program RASR. */ |
| " \n" |
| " ldmia r0!, {r3-r4} \n" /* Read third set of RBAR/RASR registers from TCB. */ |
| " str r3, [r1] \n" /* Program RBAR. */ |
| " str r4, [r2] \n" /* Program RASR. */ |
| " \n" |
| " ldmia r0!, {r3-r4} \n" /* Read fourth set of RBAR/RASR registers from TCB. */ |
| " str r3, [r1] \n" /* Program RBAR. */ |
| " str r4, [r2] \n" /* Program RASR. */ |
| " \n" |
| " ldmia r0!, {r3-r4} \n" /* Read fifth set of RBAR/RASR registers from TCB. */ |
| " str r3, [r1] \n" /* Program RBAR. */ |
| " str r4, [r2] \n" /* Program RASR. */ |
| " \n" |
| " ldr r1, =0xe000ed94 \n" /* r1 = 0xe000ed94 [Location of MPU_CTRL]. */ |
| " ldr r2, [r1] \n" /* Read the value of MPU_CTRL. */ |
| " movs r3, #1 \n" /* r3 = 1. */ |
| " orrs r2, r3 \n" /* r2 = r2 | r3 i.e. Set the bit 0 in r2. */ |
| " str r2, [r1] \n" /* Enable MPU. */ |
| " dsb \n" /* Force memory writes before continuing. */ |
| " \n" |
| " restore_context_first_task: \n" |
| " ldr r2, =pxCurrentTCB \n" /* r2 = &pxCurrentTCB. */ |
| " ldr r0, [r2] \n" /* r0 = pxCurrentTCB.*/ |
| " ldr r1, [r0] \n" /* r1 = Location of saved context in TCB. */ |
| " \n" |
| " restore_special_regs_first_task: \n" |
| " subs r1, #12 \n" |
| " ldmia r1!, {r2-r4} \n" /* r2 = original PSP, r3 = CONTROL, r4 = LR. */ |
| " subs r1, #12 \n" |
| " msr psp, r2 \n" |
| " msr control, r3 \n" |
| " mov lr, r4 \n" |
| " \n" |
| " restore_general_regs_first_task: \n" |
| " subs r1, #32 \n" |
| " ldmia r1!, {r4-r7} \n" /* r4-r7 contain half of the hardware saved context. */ |
| " stmia r2!, {r4-r7} \n" /* Copy half of the the hardware saved context on the task stack. */ |
| " ldmia r1!, {r4-r7} \n" /* r4-r7 contain rest half of the hardware saved context. */ |
| " stmia r2!, {r4-r7} \n" /* Copy rest half of the the hardware saved context on the task stack. */ |
| " subs r1, #48 \n" |
| " ldmia r1!, {r4-r7} \n" /* Restore r8-r11. */ |
| " mov r8, r4 \n" /* r8 = r4. */ |
| " mov r9, r5 \n" /* r9 = r5. */ |
| " mov r10, r6 \n" /* r10 = r6. */ |
| " mov r11, r7 \n" /* r11 = r7. */ |
| " subs r1, #32 \n" |
| " ldmia r1!, {r4-r7} \n" /* Restore r4-r7. */ |
| " subs r1, #16 \n" |
| " \n" |
| " restore_context_done_first_task: \n" |
| " str r1, [r0] \n" /* Save the location where the context should be saved next as the first member of TCB. */ |
| " bx lr \n" |
| " \n" |
| " .align 4 \n" |
| ::"i" ( portSVC_START_SCHEDULER ) : "memory" |
| ); |
| } |
| |
| #else /* configENABLE_MPU */ |
| |
| void vRestoreContextOfFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */ |
| { |
| __asm volatile |
| ( |
| " .extern pxCurrentTCB \n" |
| " .syntax unified \n" |
| " \n" |
| " ldr r2, =pxCurrentTCB \n" /* r2 = &pxCurrentTCB. */ |
| " ldr r1, [r2] \n" /* r1 = pxCurrentTCB.*/ |
| " ldr r0, [r1] \n" /* Read top of stack from TCB - The first item in pxCurrentTCB is the task top of stack. */ |
| " \n" |
| " ldm r0!, {r2} \n" /* Read from stack - r2 = EXC_RETURN. */ |
| " movs r1, #2 \n" /* r1 = 2. */ |
| " msr CONTROL, r1 \n" /* Switch to use PSP in the thread mode. */ |
| " adds r0, #32 \n" /* Discard everything up to r0. */ |
| " msr psp, r0 \n" /* This is now the new top of stack to use in the task. */ |
| " isb \n" |
| " bx r2 \n" /* Finally, branch to EXC_RETURN. */ |
| " \n" |
| " .align 4 \n" |
| ); |
| } |
| |
| #endif /* configENABLE_MPU */ |
| |
| /*-----------------------------------------------------------*/ |
| |
| BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */ |
| { |
| __asm volatile |
| ( |
| " .syntax unified \n" |
| " \n" |
| " mrs r0, control \n" /* r0 = CONTROL. */ |
| " movs r1, #1 \n" /* r1 = 1. */ |
| " tst r0, r1 \n" /* Perform r0 & r1 (bitwise AND) and update the conditions flag. */ |
| " beq running_privileged \n" /* If the result of previous AND operation was 0, branch. */ |
| " movs r0, #0 \n" /* CONTROL[0]!=0. Return false to indicate that the processor is not privileged. */ |
| " bx lr \n" /* Return. */ |
| " running_privileged: \n" |
| " movs r0, #1 \n" /* CONTROL[0]==0. Return true to indicate that the processor is privileged. */ |
| " bx lr \n" /* Return. */ |
| " \n" |
| " .align 4 \n" |
| ::: "r0", "r1", "memory" |
| ); |
| } |
| |
| /*-----------------------------------------------------------*/ |
| |
| void vRaisePrivilege( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */ |
| { |
| __asm volatile |
| ( |
| " .syntax unified \n" |
| " \n" |
| " mrs r0, control \n" /* Read the CONTROL register. */ |
| " movs r1, #1 \n" /* r1 = 1. */ |
| " bics r0, r1 \n" /* Clear the bit 0. */ |
| " msr control, r0 \n" /* Write back the new CONTROL value. */ |
| " bx lr \n" /* Return to the caller. */ |
| ::: "r0", "r1", "memory" |
| ); |
| } |
| |
| /*-----------------------------------------------------------*/ |
| |
| void vResetPrivilege( void ) /* __attribute__ (( naked )) */ |
| { |
| __asm volatile |
| ( |
| " .syntax unified \n" |
| " \n" |
| " mrs r0, control \n" /* r0 = CONTROL. */ |
| " movs r1, #1 \n" /* r1 = 1. */ |
| " orrs r0, r1 \n" /* r0 = r0 | r1. */ |
| " msr control, r0 \n" /* CONTROL = r0. */ |
| " bx lr \n" /* Return to the caller. */ |
| ::: "r0", "r1", "memory" |
| ); |
| } |
| |
| /*-----------------------------------------------------------*/ |
| |
| void vStartFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */ |
| { |
| /* Don't reset the MSP stack as is done on CM3/4 devices. The reason is that |
| * the Vector Table Offset Register (VTOR) is optional in CM0+ architecture |
| * and therefore, may not be available on all the devices. */ |
| __asm volatile |
| ( |
| " .syntax unified \n" |
| " cpsie i \n" /* Globally enable interrupts. */ |
| " dsb \n" |
| " isb \n" |
| " svc %0 \n" /* System call to start the first task. */ |
| " nop \n" |
| " \n" |
| " .align 4 \n" |
| ::"i" ( portSVC_START_SCHEDULER ) : "memory" |
| ); |
| } |
| |
| /*-----------------------------------------------------------*/ |
| |
| uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */ |
| { |
| __asm volatile |
| ( |
| " .syntax unified \n" |
| " \n" |
| " mrs r0, PRIMASK \n" |
| " cpsid i \n" |
| " bx lr \n" |
| ::: "memory" |
| ); |
| } |
| |
| /*-----------------------------------------------------------*/ |
| |
| void vClearInterruptMask( __attribute__( ( unused ) ) uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */ |
| { |
| __asm volatile |
| ( |
| " .syntax unified \n" |
| " \n" |
| " msr PRIMASK, r0 \n" |
| " bx lr \n" |
| ::: "memory" |
| ); |
| } |
| |
| /*-----------------------------------------------------------*/ |
| |
| #if ( configENABLE_MPU == 1 ) |
| |
| void PendSV_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */ |
| { |
| __asm volatile |
| ( |
| " .extern pxCurrentTCB \n" |
| " .syntax unified \n" |
| " \n" |
| " ldr r2, =pxCurrentTCB \n" /* r2 = &( pxCurrentTCB ). */ |
| " ldr r0, [r2] \n" /* r0 = pxCurrentTCB. */ |
| " ldr r1, [r0] \n" /* r1 = Location in TCB where the context should be saved. */ |
| " mrs r2, psp \n" /* r2 = PSP. */ |
| " \n" |
| " save_general_regs: \n" |
| " stmia r1!, {r4-r7} \n" /* Store r4-r7. */ |
| " mov r4, r8 \n" /* r4 = r8. */ |
| " mov r5, r9 \n" /* r5 = r9. */ |
| " mov r6, r10 \n" /* r6 = r10. */ |
| " mov r7, r11 \n" /* r7 = r11. */ |
| " stmia r1!, {r4-r7} \n" /* Store r8-r11. */ |
| " ldmia r2!, {r4-r7} \n" /* Copy half of the hardware saved context into r4-r7. */ |
| " stmia r1!, {r4-r7} \n" /* Store the hardware saved context. */ |
| " ldmia r2!, {r4-r7} \n" /* Copy rest half of the hardware saved context into r4-r7. */ |
| " stmia r1!, {r4-r7} \n" /* Store the hardware saved context. */ |
| " \n" |
| " save_special_regs: \n" |
| " mrs r2, psp \n" /* r2 = PSP. */ |
| " mrs r3, control \n" /* r3 = CONTROL. */ |
| " mov r4, lr \n" /* r4 = LR. */ |
| " stmia r1!, {r2-r4} \n" /* Store original PSP (after hardware has saved context), CONTROL and LR. */ |
| " str r1, [r0] \n" /* Save the location from where the context should be restored as the first member of TCB. */ |
| " \n" |
| " select_next_task: \n" |
| " cpsid i \n" |
| " bl vTaskSwitchContext \n" |
| " cpsie i \n" |
| " \n" |
| " program_mpu: \n" |
| " \n" |
| " ldr r2, =pxCurrentTCB \n" /* r2 = &( pxCurrentTCB ). */ |
| " ldr r0, [r2] \n" /* r0 = pxCurrentTCB. */ |
| " adds r0, #4 \n" /* r0 = Second item in the TCB which is xMPUSettings. */ |
| " \n" |
| " dmb \n" /* Complete outstanding transfers before disabling MPU. */ |
| " ldr r1, =0xe000ed94 \n" /* r1 = 0xe000ed94 [Location of MPU_CTRL]. */ |
| " ldr r2, [r1] \n" /* Read the value of MPU_CTRL. */ |
| " movs r3, #1 \n" /* r3 = 1. */ |
| " bics r2, r3 \n" /* r2 = r2 & ~r3 i.e. Clear the bit 0 in r2. */ |
| " str r2, [r1] \n" /* Disable MPU */ |
| " \n" |
| " ldr r1, =0xe000ed9c \n" /* r1 = 0xe000ed9c [Location of RBAR]. */ |
| " ldr r2, =0xe000eda0 \n" /* r2 = 0xe000eda0 [Location of RASR]. */ |
| " \n" |
| " ldmia r0!, {r3-r4} \n" /* Read first set of RBAR/RASR registers from TCB. */ |
| " str r3, [r1] \n" /* Program RBAR. */ |
| " str r4, [r2] \n" /* Program RASR. */ |
| " \n" |
| " ldmia r0!, {r3-r4} \n" /* Read second set of RBAR/RASR registers from TCB. */ |
| " str r3, [r1] \n" /* Program RBAR. */ |
| " str r4, [r2] \n" /* Program RASR. */ |
| " \n" |
| " ldmia r0!, {r3-r4} \n" /* Read third set of RBAR/RASR registers from TCB. */ |
| " str r3, [r1] \n" /* Program RBAR. */ |
| " str r4, [r2] \n" /* Program RASR. */ |
| " \n" |
| " ldmia r0!, {r3-r4} \n" /* Read fourth set of RBAR/RASR registers from TCB. */ |
| " str r3, [r1] \n" /* Program RBAR. */ |
| " str r4, [r2] \n" /* Program RASR. */ |
| " \n" |
| " ldmia r0!, {r3-r4} \n" /* Read fifth set of RBAR/RASR registers from TCB. */ |
| " str r3, [r1] \n" /* Program RBAR. */ |
| " str r4, [r2] \n" /* Program RASR. */ |
| " \n" |
| " ldr r1, =0xe000ed94 \n" /* r1 = 0xe000ed94 [Location of MPU_CTRL]. */ |
| " ldr r2, [r1] \n" /* Read the value of MPU_CTRL. */ |
| " movs r3, #1 \n" /* r3 = 1. */ |
| " orrs r2, r3 \n" /* r2 = r2 | r3 i.e. Set the bit 0 in r2. */ |
| " str r2, [r1] \n" /* Enable MPU. */ |
| " dsb \n" /* Force memory writes before continuing. */ |
| " \n" |
| " restore_context: \n" |
| " ldr r2, =pxCurrentTCB \n" /* r2 = &pxCurrentTCB. */ |
| " ldr r0, [r2] \n" /* r0 = pxCurrentTCB.*/ |
| " ldr r1, [r0] \n" /* r1 = Location of saved context in TCB. */ |
| " \n" |
| " restore_special_regs: \n" |
| " subs r1, #12 \n" |
| " ldmia r1!, {r2-r4} \n" /* r2 = original PSP, r3 = CONTROL, r4 = LR. */ |
| " subs r1, #12 \n" |
| " msr psp, r2 \n" |
| " msr control, r3 \n" |
| " mov lr, r4 \n" |
| " \n" |
| " restore_general_regs: \n" |
| " subs r1, #32 \n" |
| " ldmia r1!, {r4-r7} \n" /* r4-r7 contain half of the hardware saved context. */ |
| " stmia r2!, {r4-r7} \n" /* Copy half of the the hardware saved context on the task stack. */ |
| " ldmia r1!, {r4-r7} \n" /* r4-r7 contain rest half of the hardware saved context. */ |
| " stmia r2!, {r4-r7} \n" /* Copy rest half of the the hardware saved context on the task stack. */ |
| " subs r1, #48 \n" |
| " ldmia r1!, {r4-r7} \n" /* Restore r8-r11. */ |
| " mov r8, r4 \n" /* r8 = r4. */ |
| " mov r9, r5 \n" /* r9 = r5. */ |
| " mov r10, r6 \n" /* r10 = r6. */ |
| " mov r11, r7 \n" /* r11 = r7. */ |
| " subs r1, #32 \n" |
| " ldmia r1!, {r4-r7} \n" /* Restore r4-r7. */ |
| " subs r1, #16 \n" |
| " \n" |
| " restore_context_done: \n" |
| " str r1, [r0] \n" /* Save the location where the context should be saved next as the first member of TCB. */ |
| " bx lr \n" |
| " \n" |
| " .align 4 \n" |
| ); |
| } |
| |
| #else /* configENABLE_MPU */ |
| |
| void PendSV_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */ |
| { |
| __asm volatile |
| ( |
| " .extern pxCurrentTCB \n" |
| " .syntax unified \n" |
| " \n" |
| " mrs r0, psp \n" /* Read PSP in r0. */ |
| " ldr r2, =pxCurrentTCB \n" /* r2 = &( pxCurrentTCB ). */ |
| " ldr r1, [r2] \n" /* r1 = pxCurrentTCB. */ |
| " subs r0, r0, #36 \n" /* Make space for LR and the remaining registers on the stack. */ |
| " str r0, [r1] \n" /* Save the new top of stack in TCB. */ |
| " \n" |
| " mov r3, lr \n" /* r3 = LR/EXC_RETURN. */ |
| " stmia r0!, {r3-r7} \n" /* Store on the stack - LR and low registers that are not automatically saved. */ |
| " mov r4, r8 \n" /* r4 = r8. */ |
| " mov r5, r9 \n" /* r5 = r9. */ |
| " mov r6, r10 \n" /* r6 = r10. */ |
| " mov r7, r11 \n" /* r7 = r11. */ |
| " stmia r0!, {r4-r7} \n" /* Store the high registers that are not saved automatically. */ |
| " \n" |
| " cpsid i \n" |
| " bl vTaskSwitchContext \n" |
| " cpsie i \n" |
| " \n" |
| " ldr r2, =pxCurrentTCB \n" /* r2 = &( pxCurrentTCB ). */ |
| " ldr r1, [r2] \n" /* r1 = pxCurrentTCB. */ |
| " ldr r0, [r1] \n" /* The first item in pxCurrentTCB is the task top of stack. r0 now points to the top of stack. */ |
| " \n" |
| " adds r0, r0, #20 \n" /* Move to the high registers. */ |
| " ldmia r0!, {r4-r7} \n" /* Restore the high registers that are not automatically restored. */ |
| " mov r8, r4 \n" /* r8 = r4. */ |
| " mov r9, r5 \n" /* r9 = r5. */ |
| " mov r10, r6 \n" /* r10 = r6. */ |
| " mov r11, r7 \n" /* r11 = r7. */ |
| " msr psp, r0 \n" /* Remember the new top of stack for the task. */ |
| " subs r0, r0, #36 \n" /* Move to the starting of the saved context. */ |
| " ldmia r0!, {r3-r7} \n" /* Read from stack - r3 = LR and r4-r7 restored. */ |
| " bx r3 \n" |
| " \n" |
| " .align 4 \n" |
| ); |
| } |
| |
| #endif /* configENABLE_MPU */ |
| |
| /*-----------------------------------------------------------*/ |
| |
| #if ( ( configENABLE_MPU == 1 ) && ( configUSE_MPU_WRAPPERS_V1 == 0 ) ) |
| |
| void SVC_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */ |
| { |
| __asm volatile |
| ( |
| " .syntax unified \n" |
| " .extern vPortSVCHandler_C \n" |
| " .extern vSystemCallEnter \n" |
| " .extern vSystemCallExit \n" |
| " .extern pxCurrentTCB \n" |
| " \n" |
| " movs r0, #4 \n" |
| " mov r1, lr \n" |
| " tst r0, r1 \n" |
| " beq stack_on_msp \n" |
| " \n" |
| " stack_on_psp: \n" |
| " mrs r0, psp \n" |
| " b route_svc \n" |
| " \n" |
| " stack_on_msp: \n" |
| " mrs r0, msp \n" |
| " b route_svc \n" |
| " \n" |
| " route_svc: \n" |
| " ldr r3, [r0, #24] \n" |
| " subs r3, #2 \n" |
| " ldrb r2, [r3, #0] \n" |
| " ldr r3, =%0 \n" |
| " cmp r2, r3 \n" |
| " blt system_call_enter \n" |
| " ldr r3, =%1 \n" |
| " cmp r2, r3 \n" |
| " beq system_call_exit \n" |
| " b vPortSVCHandler_C \n" |
| " \n" |
| " system_call_enter: \n" |
| " push {lr} \n" |
| " bl vSystemCallEnter \n" |
| " pop {pc} \n" |
| " \n" |
| " system_call_exit: \n" |
| " push {lr} \n" |
| " bl vSystemCallExit \n" |
| " pop {pc} \n" |
| " \n" |
| " .align 4 \n" |
| " \n" |
| : /* No outputs. */ |
| : "i" ( NUM_SYSTEM_CALLS ), "i" ( portSVC_SYSTEM_CALL_EXIT ) |
| : "r0", "r1", "r2", "r3", "memory" |
| ); |
| } |
| |
| #else /* ( configENABLE_MPU == 1 ) && ( configUSE_MPU_WRAPPERS_V1 == 0 ) */ |
| |
| void SVC_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */ |
| { |
| __asm volatile |
| ( |
| " .syntax unified \n" |
| " .extern vPortSVCHandler_C \n" |
| " \n" |
| " movs r0, #4 \n" |
| " mov r1, lr \n" |
| " tst r0, r1 \n" |
| " beq stacking_used_msp \n" |
| " \n" |
| " stacking_used_psp: \n" |
| " mrs r0, psp \n" |
| " b vPortSVCHandler_C \n" |
| " \n" |
| " stacking_used_msp: \n" |
| " mrs r0, msp \n" |
| " b vPortSVCHandler_C \n" |
| " \n" |
| " .align 4 \n" |
| ); |
| } |
| |
| #endif /* ( configENABLE_MPU == 1 ) && ( configUSE_MPU_WRAPPERS_V1 == 0 ) */ |
| |
| /*-----------------------------------------------------------*/ |
