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44 lines
1.3 KiB
ArmAsm
44 lines
1.3 KiB
ArmAsm
// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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.section .text
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.global esp_shared_stack_invoke_function
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.type esp_shared_stack_invoke_function, @function
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esp_shared_stack_invoke_function:
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/* save current stack and return address */
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mv t0, sp
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mv t1, ra
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/* Set shared stack as new stack pointer */
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mv sp, a1
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/* store the ra and previous stack pointer in a safe place */
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addi sp,sp,-4
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sw t0, 0(sp)
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sw t1, 4(sp)
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/* call the subroutine */
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jalr a0, 0
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/* gets the ra and stack pointer saved previously */
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lw t0, 0(sp)
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lw t1, 4(sp)
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addi sp, sp, 4
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/* restore both ra and real stack pointer of current task */
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mv ra, t1
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mv sp, t0
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ret
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