/*---------------------------------------------------------------------------- * RL-ARM - RTX *---------------------------------------------------------------------------- * Name: HAL_CM0.S * Purpose: Hardware Abstraction Layer for Cortex-M0 * Rev.: V4.60 *---------------------------------------------------------------------------- * * Copyright (c) 1999-2009 KEIL, 2009-2012 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. *---------------------------------------------------------------------------*/ .file "HAL_CM0.S" .syntax unified .equ TCB_TSTACK, 40 /*---------------------------------------------------------------------------- * Functions *---------------------------------------------------------------------------*/ .thumb .section ".text" .align 2 /*--------------------------- rt_set_PSP ------------------------------------*/ # void rt_set_PSP (U32 stack); .thumb_func .type rt_set_PSP, %function .global rt_set_PSP rt_set_PSP: .fnstart .cantunwind MSR PSP,R0 BX LR .fnend .size rt_set_PSP, .-rt_set_PSP /*--------------------------- rt_get_PSP ------------------------------------*/ # U32 rt_get_PSP (void); .thumb_func .type rt_get_PSP, %function .global rt_get_PSP rt_get_PSP: .fnstart .cantunwind MRS R0,PSP BX LR .fnend .size rt_get_PSP, .-rt_get_PSP /*--------------------------- os_set_env ------------------------------------*/ # void os_set_env (void); /* Switch to Unprivileged/Privileged Thread mode, use PSP. */ .thumb_func .type os_set_env, %function .global os_set_env os_set_env: .fnstart .cantunwind MOV R0,SP /* PSP = MSP */ MSR PSP,R0 LDR R0,=os_flags LDRB R0,[R0] LSLS R0,#31 BNE PrivilegedE MOVS R0,#0x03 /* Unprivileged Thread mode, use PSP */ MSR CONTROL,R0 BX LR PrivilegedE: MOVS R0,#0x02 /* Privileged Thread mode, use PSP */ MSR CONTROL,R0 BX LR .fnend .size os_set_env, .-os_set_env /*--------------------------- _alloc_box ------------------------------------*/ # void *_alloc_box (void *box_mem); /* Function wrapper for Unprivileged/Privileged mode. */ .thumb_func .type _alloc_box, %function .global _alloc_box _alloc_box: .fnstart .cantunwind LDR R3,=rt_alloc_box MOV R12,R3 MRS R3,IPSR LSLS R3,#24 BNE PrivilegedA MRS R3,CONTROL LSLS R3,#31 BEQ PrivilegedA SVC 0 BX LR PrivilegedA: BX R12 .fnend .size _alloc_box, .-_alloc_box /*--------------------------- _free_box -------------------------------------*/ # int _free_box (void *box_mem, void *box); /* Function wrapper for Unprivileged/Privileged mode. */ .thumb_func .type _free_box, %function .global _free_box _free_box: .fnstart .cantunwind LDR R3,=rt_free_box MOV R12,R3 MRS R3,IPSR LSLS R3,#24 BNE PrivilegedF MRS R3,CONTROL LSLS R3,#31 BEQ PrivilegedF SVC 0 BX LR PrivilegedF: BX R12 .fnend .size _free_box, .-_free_box /*-------------------------- SVC_Handler ------------------------------------*/ # void SVC_Handler (void); .thumb_func .type SVC_Handler, %function .global SVC_Handler SVC_Handler: .fnstart .cantunwind MRS R0,PSP /* Read PSP */ LDR R1,[R0,#24] /* Read Saved PC from Stack */ SUBS R1,R1,#2 /* Point to SVC Instruction */ LDRB R1,[R1] /* Load SVC Number */ CMP R1,#0 BNE SVC_User /* User SVC Number > 0 */ MOV LR,R4 LDMIA R0,{R0-R3,R4} /* Read R0-R3,R12 from stack */ MOV R12,R4 MOV R4,LR BLX R12 /* Call SVC Function */ MRS R3,PSP /* Read PSP */ STMIA R3!,{R0-R2} /* Store return values */ LDR R3,=os_tsk LDMIA R3!,{R1,R2} /* os_tsk.run, os_tsk.new */ CMP R1,R2 BEQ SVC_Exit /* no task switch */ SUBS R3,#8 CMP R1,#0 /* Runtask deleted? */ BEQ SVC_Next MRS R0,PSP /* Read PSP */ SUBS R0,R0,#32 /* Adjust Start Address */ STR R0,[R1,#TCB_TSTACK] /* Update os_tsk.run->tsk_stack */ STMIA R0!,{R4-R7} /* Save old context (R4-R7) */ MOV R4,R8 MOV R5,R9 MOV R6,R10 MOV R7,R11 STMIA R0!,{R4-R7} /* Save old context (R8-R11) */ PUSH {R2,R3} BL rt_stk_check /* Check for Stack overflow */ POP {R2,R3} SVC_Next: STR R2,[R3] /* os_tsk.run = os_tsk.new */ LDR R0,[R2,#TCB_TSTACK] /* os_tsk.new->tsk_stack */ ADDS R0,R0,#16 /* Adjust Start Address */ LDMIA R0!,{R4-R7} /* Restore new Context (R8-R11) */ MOV R8,R4 MOV R9,R5 MOV R10,R6 MOV R11,R7 MSR PSP,R0 /* Write PSP */ SUBS R0,R0,#32 /* Adjust Start Address */ LDMIA R0!,{R4-R7} /* Restore new Context (R4-R7) */ SVC_Exit: MOVS R0,#~0xFFFFFFFD /* Set EXC_RETURN value */ MVNS R0,R0 BX R0 /* RETI to Thread Mode, use PSP */ /*------------------- 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 LSLS R1,R1,#2 LDR R4,[R4,R1] /* Load SVC Function Address */ MOV LR,R4 LDMIA R0,{R0-R3,R4} /* Read R0-R3,R12 from stack */ MOV R12,R4 BLX LR /* Call SVC Function */ MRS R4,PSP /* Read PSP */ STMIA R4!,{R0-R3} /* Function return values */ SVC_Done: POP {R4,PC} /* RETI */ .fnend .size SVC_Handler, .-SVC_Handler /*-------------------------- PendSV_Handler ---------------------------------*/ # void PendSV_Handler (void); .thumb_func .type PendSV_Handler, %function .global PendSV_Handler .global Sys_Switch PendSV_Handler: .fnstart .cantunwind BL rt_pop_req Sys_Switch: LDR R3,=os_tsk LDMIA R3!,{R1,R2} /* os_tsk.run, os_tsk.new */ CMP R1,R2 BEQ Sys_Exit /* no task switch */ SUBS R3,#8 MRS R0,PSP /* Read PSP */ SUBS R0,R0,#32 /* Adjust Start Address */ STR R0,[R1,#TCB_TSTACK] /* Update os_tsk.run->tsk_stack */ STMIA R0!,{R4-R7} /* Save old context (R4-R7) */ MOV R4,R8 MOV R5,R9 MOV R6,R10 MOV R7,R11 STMIA R0!,{R4-R7} /* Save old context (R8-R11) */ PUSH {R2,R3} BL rt_stk_check /* Check for Stack overflow */ POP {R2,R3} STR R2,[R3] /* os_tsk.run = os_tsk.new */ LDR R0,[R2,#TCB_TSTACK] /* os_tsk.new->tsk_stack */ ADDS R0,R0,#16 /* Adjust Start Address */ LDMIA R0!,{R4-R7} /* Restore new Context (R8-R11) */ MOV R8,R4 MOV R9,R5 MOV R10,R6 MOV R11,R7 MSR PSP,R0 /* Write PSP */ SUBS R0,R0,#32 /* Adjust Start Address */ LDMIA R0!,{R4-R7} /* Restore new Context (R4-R7) */ Sys_Exit: MOVS R0,#~0xFFFFFFFD /* Set EXC_RETURN value */ MVNS R0,R0 BX R0 /* RETI to Thread Mode, use PSP */ .fnend .size PendSV_Handler, .-PendSV_Handler /*-------------------------- SysTick_Handler --------------------------------*/ # void SysTick_Handler (void); .thumb_func .type SysTick_Handler, %function .global SysTick_Handler SysTick_Handler: .fnstart .cantunwind BL rt_systick B Sys_Switch .fnend .size SysTick_Handler, .-SysTick_Handler /*-------------------------- OS_Tick_Handler --------------------------------*/ # void OS_Tick_Handler (void); .thumb_func .type OS_Tick_Handler, %function .global OS_Tick_Handler OS_Tick_Handler: .fnstart .cantunwind BL os_tick_irqack BL rt_systick B Sys_Switch .fnend .size OS_Tick_Handler, .-OS_Tick_Handler .end /*---------------------------------------------------------------------------- * end of file *---------------------------------------------------------------------------*/