backtrace on mips

最新推荐文章于 2023-05-19 17:04:25 发布

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最新推荐文章于 2023-05-19 17:04:25 发布

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分类专栏： linux 文章标签： exception signal fun bt gcc c

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本文深入解析了GCC编译器中的-fexceptions、-funwind-tables、-fasynchronous-unwind-tables选项，并通过backt.c示例展示了如何使用这些选项进行异常处理。同时，详细介绍了backt.c的实现过程，包括段错误处理函数和异常堆栈跟踪。

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for C：

（1）正解：

mipsel-linux-gcc backt.c -g -rdynamic -fexceptions

原因：

-fexceptions

Enable exception handling. Generates extra code needed to propagate exceptions. For some targets, this implies GCC generates frame unwind information for all functions, which can produce significant data size overhead, although it does not affect execution.If you do not specify this option,GCC enables it by default for languages like C++ that normally require exception handling, and disables it for languages like C that do not normally require it. However, you may need to enable this option when compiling C code that needs to interoperate properly with exception handlers written in C++. You may also wish to disable this option if you are compiling older C++ programs that don't use exception handling.

（2）

mipsel-linux-gcc backt.c -g -rdynamic -funwind-tables

（3）

mipsel-linux-gcc backt.c -g -rdynamic -fasynchronous-unwind-tables

for C++：

mipsel-linux-g++ backt.c -g -rdynamic

以下是backt.c的实现：

#include <execinfo.h>
#include <stdio.h>
#include <stdlib.h>
 
#include <signal.h>
#include <unistd.h>
 
void print_bt()
{
    void *array[10];
    size_t size;
    char **strings;
    size_t i;
 
    size = backtrace (array, 10);
    strings = backtrace_symbols (array, size);
 
    printf ("*****Obtained %zd stack frames.*****\n", size);
 
    for (i = 0; i < size; i++)
    printf ("%s\n", strings[i]);
 
    free (strings);
}
 
//段错误处理函数
void dump(int signo)
{
    printf("[*****Program received signal SIGSEGV, Segmentation fault.id=%d*****]\n", signo);
    print_bt();
 
    exit(0);
}
void fun3()
{
    print_bt();
}
void fun2()
{
    fun3();
}
void fun1()
{
    fun2();
}
 
int main(int argc, char *argv[])
{
    signal(SIGSEGV, &dump);
    signal(SIGABRT, &dump);
    fun1();
 
    return 0;
}

参考文献：

http://sourceware.org/ml/libc-ports/2006-04/msg00009.html

http://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html