perf_counter/systick_wrapper_ual.s
2021-01-11 18:59:02 +00:00

47 lines
2.2 KiB
ArmAsm

;/****************************************************************************
;* Copyright 2021 Gorgon Meducer (Email:embedded_zhuoran@hotmail.com) *
;* *
;* Licensed under the Apache License, Version 2.0 (the "License"); *
;* you may not use this file except in compliance with the License. *
;* You may obtain a copy of the License at *
;* *
;* http://www.apache.org/licenses/LICENSE-2.0 *
;* *
;* Unless required by applicable law or agreed to in writing, software *
;* distributed under the License is distributed on an "AS IS" BASIS, *
;* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
;* See the License for the specific language governing permissions and *
;* limitations under the License. *
;* *
;****************************************************************************/
PRESERVE8
THUMB
AREA |.text|, CODE, READONLY
|$Sub$$SysTick_Handler| PROC
EXPORT |$Sub$$SysTick_Handler|
IMPORT user_code_insert_to_systick_handler
IMPORT |$Super$$SysTick_Handler|
push {r4, r5}
push {r4, lr}
LDR R0, =user_code_insert_to_systick_handler
BLX R0
pop {r4, r5}
mov lr, r5
pop {r4, r5}
LDR R0, =|$Super$$SysTick_Handler|
BX R0
ENDP
ALIGN
AREA |.text|, CODE, READONLY
__ensure_systick_wrapper PROC
EXPORT __ensure_systick_wrapper
NOP
BX LR
ENDP
END