371 lines
11 KiB
ArmAsm
371 lines
11 KiB
ArmAsm
/*----------------------------------------------------------------------------
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* RL-ARM - RTX
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*----------------------------------------------------------------------------
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* Name: HAL_CM0.S
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* Purpose: Hardware Abstraction Layer for Cortex-M0
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* Rev.: V4.60
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*----------------------------------------------------------------------------
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*
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* Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*---------------------------------------------------------------------------*/
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.file "HAL_CM0.S"
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.syntax unified
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.equ TCB_TSTACK, 40
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/*----------------------------------------------------------------------------
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* Functions
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*---------------------------------------------------------------------------*/
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.thumb
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.section ".text"
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.align 2
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/*--------------------------- rt_set_PSP ------------------------------------*/
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# void rt_set_PSP (U32 stack);
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.thumb_func
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.type rt_set_PSP, %function
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.global rt_set_PSP
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rt_set_PSP:
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.fnstart
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.cantunwind
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MSR PSP,R0
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BX LR
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.fnend
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.size rt_set_PSP, .-rt_set_PSP
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/*--------------------------- rt_get_PSP ------------------------------------*/
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# U32 rt_get_PSP (void);
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.thumb_func
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.type rt_get_PSP, %function
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.global rt_get_PSP
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rt_get_PSP:
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.fnstart
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.cantunwind
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MRS R0,PSP
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BX LR
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.fnend
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.size rt_get_PSP, .-rt_get_PSP
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/*--------------------------- os_set_env ------------------------------------*/
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# void os_set_env (void);
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/* Switch to Unprivileged/Privileged Thread mode, use PSP. */
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.thumb_func
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.type os_set_env, %function
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.global os_set_env
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os_set_env:
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.fnstart
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.cantunwind
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MOV R0,SP /* PSP = MSP */
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MSR PSP,R0
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LDR R0,=os_flags
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LDRB R0,[R0]
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LSLS R0,#31
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BNE PrivilegedE
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MOVS R0,#0x03 /* Unprivileged Thread mode, use PSP */
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MSR CONTROL,R0
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BX LR
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PrivilegedE:
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MOVS R0,#0x02 /* Privileged Thread mode, use PSP */
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MSR CONTROL,R0
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BX LR
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.fnend
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.size os_set_env, .-os_set_env
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/*--------------------------- _alloc_box ------------------------------------*/
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# void *_alloc_box (void *box_mem);
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/* Function wrapper for Unprivileged/Privileged mode. */
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.thumb_func
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.type _alloc_box, %function
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.global _alloc_box
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_alloc_box:
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.fnstart
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.cantunwind
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LDR R3,=rt_alloc_box
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MOV R12,R3
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MRS R3,IPSR
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LSLS R3,#24
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BNE PrivilegedA
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MRS R3,CONTROL
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LSLS R3,#31
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BEQ PrivilegedA
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SVC 0
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BX LR
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PrivilegedA:
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BX R12
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.fnend
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.size _alloc_box, .-_alloc_box
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/*--------------------------- _free_box -------------------------------------*/
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# int _free_box (void *box_mem, void *box);
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/* Function wrapper for Unprivileged/Privileged mode. */
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.thumb_func
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.type _free_box, %function
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.global _free_box
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_free_box:
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.fnstart
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.cantunwind
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LDR R3,=rt_free_box
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MOV R12,R3
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MRS R3,IPSR
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LSLS R3,#24
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BNE PrivilegedF
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MRS R3,CONTROL
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LSLS R3,#31
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BEQ PrivilegedF
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SVC 0
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BX LR
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PrivilegedF:
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BX R12
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.fnend
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.size _free_box, .-_free_box
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/*-------------------------- SVC_Handler ------------------------------------*/
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# void SVC_Handler (void);
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.thumb_func
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.type SVC_Handler, %function
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.global SVC_Handler
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SVC_Handler:
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.fnstart
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.cantunwind
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MRS R0,PSP /* Read PSP */
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LDR R1,[R0,#24] /* Read Saved PC from Stack */
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SUBS R1,R1,#2 /* Point to SVC Instruction */
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LDRB R1,[R1] /* Load SVC Number */
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CMP R1,#0
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BNE SVC_User /* User SVC Number > 0 */
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MOV LR,R4
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LDMIA R0,{R0-R3,R4} /* Read R0-R3,R12 from stack */
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MOV R12,R4
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MOV R4,LR
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BLX R12 /* Call SVC Function */
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MRS R3,PSP /* Read PSP */
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STMIA R3!,{R0-R2} /* Store return values */
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LDR R3,=os_tsk
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LDMIA R3!,{R1,R2} /* os_tsk.run, os_tsk.new */
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CMP R1,R2
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BEQ SVC_Exit /* no task switch */
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SUBS R3,#8
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CMP R1,#0 /* Runtask deleted? */
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BEQ SVC_Next
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MRS R0,PSP /* Read PSP */
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SUBS R0,R0,#32 /* Adjust Start Address */
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STR R0,[R1,#TCB_TSTACK] /* Update os_tsk.run->tsk_stack */
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STMIA R0!,{R4-R7} /* Save old context (R4-R7) */
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MOV R4,R8
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MOV R5,R9
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MOV R6,R10
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MOV R7,R11
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STMIA R0!,{R4-R7} /* Save old context (R8-R11) */
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PUSH {R2,R3}
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BL rt_stk_check /* Check for Stack overflow */
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POP {R2,R3}
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SVC_Next:
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STR R2,[R3] /* os_tsk.run = os_tsk.new */
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LDR R0,[R2,#TCB_TSTACK] /* os_tsk.new->tsk_stack */
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ADDS R0,R0,#16 /* Adjust Start Address */
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LDMIA R0!,{R4-R7} /* Restore new Context (R8-R11) */
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MOV R8,R4
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MOV R9,R5
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MOV R10,R6
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MOV R11,R7
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MSR PSP,R0 /* Write PSP */
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SUBS R0,R0,#32 /* Adjust Start Address */
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LDMIA R0!,{R4-R7} /* Restore new Context (R4-R7) */
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SVC_Exit:
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MOVS R0,#~0xFFFFFFFD /* Set EXC_RETURN value */
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MVNS R0,R0
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BX R0 /* RETI to Thread Mode, use PSP */
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/*------------------- User SVC ------------------------------*/
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SVC_User:
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PUSH {R4,LR} /* Save Registers */
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LDR R2,=SVC_Count
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LDR R2,[R2]
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CMP R1,R2
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BHI SVC_Done /* Overflow */
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LDR R4,=SVC_Table-4
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LSLS R1,R1,#2
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LDR R4,[R4,R1] /* Load SVC Function Address */
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MOV LR,R4
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LDMIA R0,{R0-R3,R4} /* Read R0-R3,R12 from stack */
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MOV R12,R4
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BLX LR /* Call SVC Function */
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MRS R4,PSP /* Read PSP */
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STMIA R4!,{R0-R3} /* Function return values */
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SVC_Done:
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POP {R4,PC} /* RETI */
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.fnend
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.size SVC_Handler, .-SVC_Handler
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/*-------------------------- PendSV_Handler ---------------------------------*/
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# void PendSV_Handler (void);
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.thumb_func
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.type PendSV_Handler, %function
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.global PendSV_Handler
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.global Sys_Switch
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PendSV_Handler:
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.fnstart
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.cantunwind
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BL rt_pop_req
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Sys_Switch:
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LDR R3,=os_tsk
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LDMIA R3!,{R1,R2} /* os_tsk.run, os_tsk.new */
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CMP R1,R2
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BEQ Sys_Exit /* no task switch */
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SUBS R3,#8
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MRS R0,PSP /* Read PSP */
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SUBS R0,R0,#32 /* Adjust Start Address */
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STR R0,[R1,#TCB_TSTACK] /* Update os_tsk.run->tsk_stack */
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STMIA R0!,{R4-R7} /* Save old context (R4-R7) */
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MOV R4,R8
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MOV R5,R9
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MOV R6,R10
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MOV R7,R11
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STMIA R0!,{R4-R7} /* Save old context (R8-R11) */
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PUSH {R2,R3}
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BL rt_stk_check /* Check for Stack overflow */
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POP {R2,R3}
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STR R2,[R3] /* os_tsk.run = os_tsk.new */
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LDR R0,[R2,#TCB_TSTACK] /* os_tsk.new->tsk_stack */
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ADDS R0,R0,#16 /* Adjust Start Address */
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LDMIA R0!,{R4-R7} /* Restore new Context (R8-R11) */
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MOV R8,R4
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MOV R9,R5
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MOV R10,R6
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MOV R11,R7
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MSR PSP,R0 /* Write PSP */
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SUBS R0,R0,#32 /* Adjust Start Address */
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LDMIA R0!,{R4-R7} /* Restore new Context (R4-R7) */
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Sys_Exit:
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MOVS R0,#~0xFFFFFFFD /* Set EXC_RETURN value */
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MVNS R0,R0
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BX R0 /* RETI to Thread Mode, use PSP */
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.fnend
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.size PendSV_Handler, .-PendSV_Handler
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/*-------------------------- SysTick_Handler --------------------------------*/
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# void SysTick_Handler (void);
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.thumb_func
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.type SysTick_Handler, %function
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.global SysTick_Handler
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SysTick_Handler:
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.fnstart
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.cantunwind
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BL rt_systick
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B Sys_Switch
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.fnend
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.size SysTick_Handler, .-SysTick_Handler
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/*-------------------------- OS_Tick_Handler --------------------------------*/
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# void OS_Tick_Handler (void);
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.thumb_func
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.type OS_Tick_Handler, %function
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.global OS_Tick_Handler
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OS_Tick_Handler:
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.fnstart
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.cantunwind
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BL os_tick_irqack
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BL rt_systick
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B Sys_Switch
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.fnend
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.size OS_Tick_Handler, .-OS_Tick_Handler
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.end
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/*----------------------------------------------------------------------------
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* end of file
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*---------------------------------------------------------------------------*/
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