/*---------------------------------------------------------------------------- * CMSIS-RTOS - RTX *---------------------------------------------------------------------------- * Name: HAL_CM3.C * Purpose: Hardware Abstraction Layer for Cortex-M3 * Rev.: V4.70 *---------------------------------------------------------------------------- * * Copyright (c) 1999-2009 KEIL, 2009-2013 ARM Germany GmbH * All rights reserved. * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - Neither the name of ARM nor the names of its contributors may be used * to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. *---------------------------------------------------------------------------*/ #include "rt_TypeDef.h" #include "RTX_Config.h" #include "rt_System.h" #include "rt_HAL_CM.h" #include "rt_Task.h" #include "rt_MemBox.h" /*---------------------------------------------------------------------------- * Functions *---------------------------------------------------------------------------*/ /*--------------------------- rt_set_PSP ------------------------------------*/ __asm void rt_set_PSP (U32 stack) { MSR PSP,R0 BX LR } /*--------------------------- rt_get_PSP ------------------------------------*/ __asm U32 rt_get_PSP (void) { MRS R0,PSP BX LR } /*--------------------------- os_set_env ------------------------------------*/ __asm void os_set_env (void) { /* Switch to Unprivileged/Privileged Thread mode, use PSP. */ MOV R0,SP ; PSP = MSP MSR PSP,R0 LDR R0,=__cpp(&os_flags) LDRB R0,[R0] LSLS R0,#31 MOVNE R0,#0x02 ; Privileged Thread mode, use PSP MOVEQ R0,#0x03 ; Unprivileged Thread mode, use PSP MSR CONTROL,R0 BX LR ALIGN } /*--------------------------- _alloc_box ------------------------------------*/ __asm void *_alloc_box (void *box_mem) { /* Function wrapper for Unprivileged/Privileged mode. */ LDR R12,=__cpp(rt_alloc_box) MRS R3,IPSR LSLS R3,#24 BXNE R12 MRS R3,CONTROL LSLS R3,#31 BXEQ R12 SVC 0 BX LR ALIGN } /*--------------------------- _free_box -------------------------------------*/ __asm U32 _free_box (void *box_mem, void *box) { /* Function wrapper for Unprivileged/Privileged mode. */ LDR R12,=__cpp(rt_free_box) MRS R3,IPSR LSLS R3,#24 BXNE R12 MRS R3,CONTROL LSLS R3,#31 BXEQ R12 SVC 0 BX LR ALIGN } /*-------------------------- SVC_Handler ------------------------------------*/ __asm void SVC_Handler (void) { PRESERVE8 IMPORT SVC_Count IMPORT SVC_Table IMPORT rt_stk_check #ifdef IFX_XMC4XXX EXPORT SVC_Handler_Veneer SVC_Handler_Veneer #endif MRS R0,PSP ; Read PSP LDR R1,[R0,#24] ; Read Saved PC from Stack LDRB R1,[R1,#-2] ; Load SVC Number CBNZ R1,SVC_User LDM R0,{R0-R3,R12} ; Read R0-R3,R12 from stack BLX R12 ; Call SVC Function MRS R12,PSP ; Read PSP STM R12,{R0-R2} ; Store return values LDR R3,=__cpp(&os_tsk) LDM R3,{R1,R2} ; os_tsk.run, os_tsk.next CMP R1,R2 BEQ SVC_Exit ; no task switch CBZ R1,SVC_Next ; Runtask deleted? STMDB R12!,{R4-R11} ; Save Old context STR R12,[R1,#TCB_TSTACK] ; Update os_tsk.run->tsk_stack PUSH {R2,R3} BL rt_stk_check ; Check for Stack overflow POP {R2,R3} SVC_Next STR R2,[R3] ; os_tsk.run = os_tsk.next LDR R12,[R2,#TCB_TSTACK] ; os_tsk.next->tsk_stack LDMIA R12!,{R4-R11} ; Restore New Context MSR PSP,R12 ; Write PSP SVC_Exit MVN LR,#:NOT:0xFFFFFFFD ; set EXC_RETURN value #ifdef IFX_XMC4XXX PUSH {LR} POP {PC} #else BX LR #endif /*------------------- User SVC ------------------------------*/ SVC_User PUSH {R4,LR} ; Save Registers LDR R2,=SVC_Count LDR R2,[R2] CMP R1,R2 BHI SVC_Done ; Overflow LDR R4,=SVC_Table-4 LDR R4,[R4,R1,LSL #2] ; Load SVC Function Address LDM R0,{R0-R3,R12} ; Read R0-R3,R12 from stack BLX R4 ; Call SVC Function MRS R12,PSP STM R12,{R0-R3} ; Function return values SVC_Done POP {R4,PC} ; RETI ALIGN } /*-------------------------- PendSV_Handler ---------------------------------*/ __asm void PendSV_Handler (void) { PRESERVE8 #ifdef IFX_XMC4XXX EXPORT PendSV_Handler_Veneer PendSV_Handler_Veneer #endif BL __cpp(rt_pop_req) Sys_Switch LDR R3,=__cpp(&os_tsk) LDM R3,{R1,R2} ; os_tsk.run, os_tsk.next CMP R1,R2 BEQ Sys_Exit MRS R12,PSP ; Read PSP STMDB R12!,{R4-R11} ; Save Old context STR R12,[R1,#TCB_TSTACK] ; Update os_tsk.run->tsk_stack PUSH {R2,R3} BL rt_stk_check ; Check for Stack overflow POP {R2,R3} STR R2,[R3] ; os_tsk.run = os_tsk.next LDR R12,[R2,#TCB_TSTACK] ; os_tsk.next->tsk_stack LDMIA R12!,{R4-R11} ; Restore New Context MSR PSP,R12 ; Write PSP Sys_Exit MVN LR,#:NOT:0xFFFFFFFD ; set EXC_RETURN value #ifdef IFX_XMC4XXX PUSH {LR} POP {PC} #else BX LR ; Return to Thread Mode #endif ALIGN } /*-------------------------- SysTick_Handler --------------------------------*/ __asm void SysTick_Handler (void) { PRESERVE8 #ifdef IFX_XMC4XXX EXPORT SysTick_Handler_Veneer SysTick_Handler_Veneer #endif BL __cpp(rt_systick) B Sys_Switch ALIGN } /*-------------------------- OS_Tick_Handler --------------------------------*/ __asm void OS_Tick_Handler (void) { PRESERVE8 BL __cpp(os_tick_irqack) BL __cpp(rt_systick) B Sys_Switch ALIGN } /*---------------------------------------------------------------------------- * end of file *---------------------------------------------------------------------------*/