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* support rust panic backtrace mini-backtrace has llvm's unwind cpp source to support backtrace/unwind. as unwind/backtrace needs dynamically allocates memory, mini-backtrace uses stack memory to capture fixed number of backtrace to avoid heap allocation. as unwind library needed, it needs to turn on eh_frame_hdr * 修改忘了生成kernel.elf的问题 * 设置backtrace是默认的feature --------- Co-authored-by: Yao Zhao <dragonlinux@gmail.com>