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/*----------------------------------------------------------------------------
* RL-ARM - RTX
*----------------------------------------------------------------------------
* Name: HAL_CM3.S
* Purpose: Hardware Abstraction Layer for Cortex-M3
* 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_CM3.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
ITE NE
MOVNE R0,#0x02 /* Privileged Thread mode, use PSP */
MOVEQ R0,#0x03 /* Unprivileged 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 R12,=rt_alloc_box
MRS R3,IPSR
LSLS R3,#24
IT NE
BXNE R12
MRS R3,CONTROL
LSLS R3,#31
IT EQ
BXEQ R12
SVC 0
BX LR
.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 R12,=rt_free_box
MRS R3,IPSR
LSLS R3,#24
IT NE
BXNE R12
MRS R3,CONTROL
LSLS R3,#31
IT EQ
BXEQ R12
SVC 0
BX LR
.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 */
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,=os_tsk
LDM R3,{R1,R2} /* os_tsk.run, os_tsk.new */
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.new */
LDR R12,[R2,#TCB_TSTACK] /* os_tsk.new->tsk_stack */
LDMIA R12!,{R4-R11} /* Restore New Context */
MSR PSP,R12 /* Write PSP */
SVC_Exit:
MVN LR,#~0xFFFFFFFD /* set EXC_RETURN value */
BX LR
/*------------------- 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 */
.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
LDM R3,{R1,R2} /* os_tsk.run, os_tsk.new */
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.new */
LDR R12,[R2,#TCB_TSTACK] /* os_tsk.new->tsk_stack */
LDMIA R12!,{R4-R11} /* Restore New Context */
MSR PSP,R12 /* Write PSP */
Sys_Exit:
MVN LR,#~0xFFFFFFFD /* set EXC_RETURN value */
BX LR /* Return to Thread Mode */
.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
*---------------------------------------------------------------------------*/
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