Create systick_wrapper_gcc.S

systick_wrapper_gcc.S

@@ -0,0 +1,44 @@
+;/****************************************************************************
+;*  Copyright 2022 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.                                           *
+;*                                                                           *
+;****************************************************************************/
+
+    .syntax	unified
+    .arch	armv6-m
+
+    .text
+    .thumb
+    .thumb_func
+    .align	2
+    .globl	__wrap_SysTick_Handler
+    .type	__wrap_SysTick_Handler, %function
+
+__wrap_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, =__real_SysTick_Handler
+    bx      R0
+                
+
+    .globl	__ensure_systick_wrapper
+    .type	__ensure_systick_wrapper, %function
+
+__ensure_systick_wrapper:
+    bx      lr