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0d757d0134
Add the implementation of _mcount() to meet the requirements of gprof. Signed-off-by: chenxiaoyi <chenxiaoyi@xiaomi.com>
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/****************************************************************************
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* libs/libc/machine/xtensa/arch_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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* 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 Xtensa mcount function. It is called by the profiling logic
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* 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(uintptr_t from_pc)
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{
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#ifndef __XTENSA_CALL0_ABI__
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uint32_t high_bit_mask = (0x03 << 30);
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uint32_t low_bit_mask = ~high_bit_mask;
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uint32_t pc_high_bits = ((uint32_t)_mcount) & high_bit_mask;
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#endif
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uintptr_t self_pc;
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__asm__ __volatile__
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(
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"mov %0, a0\n"
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: "=r" (self_pc)
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);
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#ifndef __XTENSA_CALL0_ABI__
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self_pc = pc_high_bits | (self_pc & low_bit_mask);
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from_pc = pc_high_bits | (from_pc & low_bit_mask);
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#endif
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mcount_internal(from_pc, self_pc);
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}
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