370 lines
12 KiB
ArmAsm
370 lines
12 KiB
ArmAsm
/*----------------------------------------------------------------------------
|
|
* CMSIS-RTOS - RTX
|
|
*----------------------------------------------------------------------------
|
|
* Name: HAL_CM0.S
|
|
* Purpose: Hardware Abstraction Layer for Cortex-M0
|
|
* 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.
|
|
*---------------------------------------------------------------------------*/
|
|
|
|
.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 -------------------------------------*/
|
|
|
|
# U32 _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.next */
|
|
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.next */
|
|
|
|
LDR R0,[R2,#TCB_TSTACK] /* os_tsk.next->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.next */
|
|
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.next */
|
|
|
|
LDR R0,[R2,#TCB_TSTACK] /* os_tsk.next->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
|
|
*---------------------------------------------------------------------------*/
|