298 lines
9.9 KiB
ArmAsm
298 lines
9.9 KiB
ArmAsm
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/*----------------------------------------------------------------------------
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* RL-ARM - RTX
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*----------------------------------------------------------------------------
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* Name: HAL_CM4.S
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* Purpose: Hardware Abstraction Layer for Cortex-M4
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* Rev.: V4.70
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*----------------------------------------------------------------------------
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*
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* Copyright (c) 1999-2009 KEIL, 2009-2013 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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NAME HAL_CM4.S
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#define TCB_STACKF 32
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#define TCB_TSTACK 36
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EXTERN os_flags
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EXTERN os_tsk
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EXTERN rt_alloc_box
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EXTERN rt_free_box
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EXTERN rt_stk_check
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EXTERN rt_pop_req
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EXTERN rt_systick
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EXTERN os_tick_irqack
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EXTERN SVC_Table
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EXTERN SVC_Count
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/*----------------------------------------------------------------------------
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* Functions
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*---------------------------------------------------------------------------*/
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SECTION .text:CODE:NOROOT(2)
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THUMB
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/*--------------------------- rt_set_PSP ------------------------------------*/
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; void rt_set_PSP (U32 stack);
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PUBLIC rt_set_PSP
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rt_set_PSP:
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MSR PSP,R0
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BX LR
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/*--------------------------- rt_get_PSP ------------------------------------*/
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; U32 rt_get_PSP (void);
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PUBLIC rt_get_PSP
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rt_get_PSP:
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MRS R0,PSP
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BX LR
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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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PUBLIC os_set_env
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os_set_env:
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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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ITE NE
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MOVNE R0,#0x02 /* Privileged Thread mode, use PSP */
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MOVEQ R0,#0x03 /* Unprivileged Thread mode, use PSP */
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MSR CONTROL,R0
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BX LR
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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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PUBLIC _alloc_box
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_alloc_box:
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LDR R12,=rt_alloc_box
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MRS R3,IPSR
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LSLS R3,#24
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IT NE
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BXNE R12
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MRS R3,CONTROL
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LSLS R3,#31
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IT EQ
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BXEQ R12
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SVC 0
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BX LR
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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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PUBLIC _free_box
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_free_box:
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LDR R12,=rt_free_box
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MRS R3,IPSR
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LSLS R3,#24
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IT NE
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BXNE R12
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MRS R3,CONTROL
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LSLS R3,#31
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IT EQ
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BXEQ R12
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SVC 0
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BX LR
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/*-------------------------- SVC_Handler ------------------------------------*/
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; void SVC_Handler (void);
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PUBLIC SVC_Handler
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SVC_Handler:
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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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LDRB R1,[R1,#-2] /* Load SVC Number */
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CBNZ R1,SVC_User
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LDM R0,{R0-R3,R12} /* Read R0-R3,R12 from stack */
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PUSH {R4,LR} /* Save EXC_RETURN */
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BLX R12 /* Call SVC Function */
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POP {R4,LR} /* Restore EXC_RETURN */
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MRS R12,PSP /* Read PSP */
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STM R12,{R0-R2} /* Store return values */
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LDR R3,=os_tsk
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LDM R3,{R1,R2} /* os_tsk.run, os_tsk.new */
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CMP R1,R2
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IT EQ
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BXEQ LR /* RETI, no task switch */
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CBZ R1,SVC_Next /* Runtask deleted? */
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TST LR,#0x10 /* is it extended frame? */
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ITTE EQ
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VSTMDBEQ R12!,{S16-S31} /* yes, stack also VFP hi-regs */
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MOVEQ R0,#0x01 /* os_tsk->stack_frame val */
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MOVNE R0,#0x00
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STRB R0,[R1,#TCB_STACKF] /* os_tsk.run->stack_frame = val */
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STMDB R12!,{R4-R11} /* Save Old context */
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STR R12,[R1,#TCB_TSTACK] /* Update os_tsk.run->tsk_stack */
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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 R12,[R2,#TCB_TSTACK] /* os_tsk.new->tsk_stack */
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LDMIA R12!,{R4-R11} /* Restore New Context */
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LDRB R0,[R2,#TCB_STACKF] /* Stack Frame */
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CMP R0,#0 /* Basic/Extended Stack Frame */
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ITTE NE
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VLDMIANE R12!,{S16-S31} /* restore VFP hi-registers */
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MVNNE LR,#~0xFFFFFFED /* set EXC_RETURN value */
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MVNEQ LR,#~0xFFFFFFFD
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MSR PSP,R12 /* Write PSP */
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SVC_Exit:
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BX LR
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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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LDR R4,[R4,R1,LSL #2] /* Load SVC Function Address */
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LDM R0,{R0-R3,R12} /* Read R0-R3,R12 from stack */
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BLX R4 /* Call SVC Function */
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MRS R12,PSP
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STM R12,{R0-R3} /* Function return values */
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SVC_Done:
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POP {R4,PC} /* RETI */
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/*-------------------------- PendSV_Handler ---------------------------------*/
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; void PendSV_Handler (void);
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PUBLIC PendSV_Handler
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PendSV_Handler:
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PUSH {R4,LR} /* Save EXC_RETURN */
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BL rt_pop_req
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Sys_Switch:
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POP {R4,LR} /* Restore EXC_RETURN */
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LDR R3,=os_tsk
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LDM R3,{R1,R2} /* os_tsk.run, os_tsk.new */
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CMP R1,R2
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IT EQ
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BXEQ LR /* RETI, no task switch */
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MRS R12,PSP /* Read PSP */
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TST LR,#0x10 /* is it extended frame? */
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ITTE EQ
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VSTMDBEQ R12!,{S16-S31} /* yes, stack also VFP hi-regs */
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MOVEQ R0,#0x01 /* os_tsk->stack_frame val */
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MOVNE R0,#0x00
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STRB R0,[R1,#TCB_STACKF] /* os_tsk.run->stack_frame = val */
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STMDB R12!,{R4-R11} /* Save Old context */
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STR R12,[R1,#TCB_TSTACK] /* Update os_tsk.run->tsk_stack */
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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 R12,[R2,#TCB_TSTACK] /* os_tsk.new->tsk_stack */
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LDMIA R12!,{R4-R11} /* Restore New Context */
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LDRB R0,[R2,#TCB_STACKF] /* Stack Frame */
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CMP R0,#0 /* Basic/Extended Stack Frame */
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ITTE NE
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VLDMIANE R12!,{S16-S31} /* restore VFP hi-registers */
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MVNNE LR,#~0xFFFFFFED /* set EXC_RETURN value */
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MVNEQ LR,#~0xFFFFFFFD
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MSR PSP,R12 /* Write PSP */
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Sys_Exit:
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BX LR /* Return to Thread Mode */
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/*-------------------------- SysTick_Handler --------------------------------*/
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; void SysTick_Handler (void);
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PUBLIC SysTick_Handler
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SysTick_Handler:
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PUSH {R4,LR} /* Save EXC_RETURN */
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BL rt_systick
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B Sys_Switch
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/*-------------------------- OS_Tick_Handler --------------------------------*/
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; void OS_Tick_Handler (void);
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PUBLIC OS_Tick_Handler
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OS_Tick_Handler:
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PUSH {R4,LR} /* Save EXC_RETURN */
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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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END
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/*----------------------------------------------------------------------------
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* end of file
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*---------------------------------------------------------------------------*/
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