expression_with_stack_xtensa: protected switch stacks function to compile only on window ABI supported platform

components/esp_common/include/esp_expression_with_stack.h

@@ -1,3 +1,17 @@
+// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// 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.
+
 #ifndef __ESP_EXPRESSION_WITH_STACK_H
 #define __ESP_EXPRESSION_WITH_STACK_H
 

components/xtensa/expression_with_stack_xtensa.S

@@ -1,5 +1,16 @@
-#include    <xtensa/coreasm.h>
-#include    <freertos/xtensa_context.h>
+// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// 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.
 
     .text
 /**
@@ -9,12 +20,17 @@
     .type       esp_switch_stack_enter,@function
     .align      4
 esp_switch_stack_enter:
-    entry   sp, 0x10
-    mov   a4, a1
-    s32i   a4, a3, 0 /* on a3 there is a safe place to save the current stack */
-    l32i   a4, a2, 0 /* obtains the user allocated stack buffer */
-    mov   a1, a4     /* sp register now contains caller specified stack */
-    retw
+
+    #ifndef __XTENSA_CALL0_ABI__
+        entry   sp, 0x10
+        mov   a4, a1
+        s32i   a4, a3, 0 /* on a3 there is a safe place to save the current stack */
+        l32i   a4, a2, 0 /* obtains the user allocated stack buffer */
+        mov   a1, a4     /* sp register now contains caller specified stack */
+        retw
+    #else 
+        #error "this code is written for Window ABI"
+    #endif
 
 /**
  * extern void switch_stack_exit(portSTACK_TYPE *backup_stack);
@@ -23,7 +39,12 @@ esp_switch_stack_enter:
     .type   esp_switch_stack_exit,@function
     .align  4
 esp_switch_stack_exit:
-    entry   sp, 0x10
-    l32i a4, a2, 0  /* recover the original task stack */
-    mov a1, a4      /* put it on sp register again */
-    retw
+
+    #ifndef __XTENSA_CALL0_ABI__
+        entry   sp, 0x10
+        l32i a4, a2, 0  /* recover the original task stack */
+        mov a1, a4      /* put it on sp register again */
+        retw
+    #else 
+        #error "this code is written for Window ABI"
+    #endif