4c8d244fae
NuttX kernel should not use the syscall functions, especially after enabling CONFIG_SCHED_INSTRUMENTATION_SYSCALL, all system functions will be traced to backend, which will impact system performance. Signed-off-by: chao an <anchao@xiaomi.com>
145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/****************************************************************************
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* libs/libc/sched/sched_backtrace.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 <nuttx/config.h>
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#ifndef CONFIG_ARCH_HAVE_BACKTRACE
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#include <sys/types.h>
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#include <unistd.h>
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#include <execinfo.h>
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#include <unwind.h>
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#include <nuttx/sched.h>
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/****************************************************************************
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* Private Data Types
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****************************************************************************/
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struct trace_arg
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{
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FAR void **array;
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_Unwind_Word cfa;
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int cnt;
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int size;
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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weak_function
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FAR void *unwind_arch_adjustment(FAR void *prev, FAR void *addr)
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{
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return addr;
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}
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static _Unwind_Reason_Code
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backtrace_helper(FAR struct _Unwind_Context *ctx, FAR void *a)
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{
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FAR struct trace_arg *arg = a;
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/* We are first called with address in the backtrace function.
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* Skip it.
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*/
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if (arg->cnt >= 0)
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{
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arg->array[arg->cnt] = (FAR void *)_Unwind_GetIP(ctx);
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if (arg->cnt > 0)
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{
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arg->array[arg->cnt]
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= unwind_arch_adjustment(arg->array[arg->cnt - 1],
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arg->array[arg->cnt]);
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}
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/* Check whether we make any progress. */
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_Unwind_Word cfa = _Unwind_GetCFA(ctx);
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if (arg->cnt > 0 &&
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arg->array[arg->cnt - 1] == arg->array[arg->cnt] &&
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cfa == arg->cfa)
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{
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return _URC_END_OF_STACK;
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}
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arg->cfa = cfa;
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}
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if (++arg->cnt >= arg->size)
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{
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return _URC_END_OF_STACK;
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}
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return _URC_NO_REASON;
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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: sched_backtrace
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*
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* Description:
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* Get thread backtrace from specified tid.
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*
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****************************************************************************/
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int sched_backtrace(pid_t tid, FAR void **buffer, int size, int skip)
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{
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struct trace_arg arg;
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if (tid != _SCHED_GETTID())
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{
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return 0;
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}
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arg.array = buffer;
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arg.cfa = 0;
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arg.size = size;
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arg.cnt = -skip - 1;
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if (size <= 0)
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{
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return 0;
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}
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_Unwind_Backtrace(backtrace_helper, &arg);
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/* _Unwind_Backtrace seems to put NULL address above
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* _start. Fix it up here.
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*/
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if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
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{
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--arg.cnt;
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}
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return arg.cnt > 0 ? arg.cnt : 0;
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}
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#endif /* !CONFIG_ARCH_HAVE_BACKTRACE */
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