Linux生成core dump的做法
一、 内核必须打开选项 CONFIG_ELF_CORE；
二、配置每个进程的RLIMIT_CORE资源为RLIM_INFINITY。方法有二： 1. 在busybox的init/init.c源文件定义了宏CORE_ENABLE_FLAG_FILE， #define CORE_ENABLE_FLAG_FILE "/.init_enable_core" 如果根目录中存在此文件，那么run会自动设core dump文件大小设为不限。  #if ENABLE_FEATURE_INIT_COREDUMPS                                                                               
         {                                                                                                       
                 struct stat sb;                                                                                 
                 if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {                                                    
                         struct rlimit limit;                                                                    
                                                                                                                 
                         limit.rlim_cur = RLIM_INFINITY;                                                         
                         limit.rlim_max = RLIM_INFINITY;                                                         
                         setrlimit(RLIMIT_CORE, &limit);                                                         
                 }                                                                                               
         }                                                                                                       
 #endif 2. 使用ulimit命令，unlimited可以一个适当的数值。请参数man ulimit。 # ulimit -c unlimited
三、core_pattern设置 因为可执行文件的目录可能没有写入权限，因为可以修改这个文件，如： # echo "/tmp/cores/core" > /proc/sys/kernel/core_pattern
详解，请参考Documentation/sysctl/kernel.txt中core_pattern部分。
四、在PC上执行调试 # gdb-host ./app ./core.xxxx # arm-gdb-host ./app ./core.xxxx # mips-gdb-host ./app ./core.xxxx