63 lines
2.2 KiB
C
63 lines
2.2 KiB
C
/****************************************************************************
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* libs/libc/machine/arm64/gnu/mcount.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/gmon.h>
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static inline noinstrument_function void *strip_pac(void *p)
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{
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register void *ra asm ("x30") = (p);
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asm ("hint 7 // xpaclri" : "+r"(ra));
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return ra;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: _mcount
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*
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* Description:
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* This is the ARM64 mcount function. It is called by the profiling
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* logic to record the call.
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*
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* Input Parameters:
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* frompc - The address of the calling instruction
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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noinstrument_function
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void _mcount(void *frompc)
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{
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mcount_internal((uintptr_t)strip_pac(frompc),
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(uintptr_t)return_address(0));
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}
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