在可编程片上系统(System on P rogramm ab le Ch ip,SOPC)中,特定应用程序中用到的指令是软核CPU指令集的子集,如果在FPGA中实现软核CPU时仅保留应用程序用到的指令子集,将可以提高硬件资源利用率.文中分析了对应用程序进行指令统计的...在可编程片上系统(System on P rogramm ab le Ch ip,SOPC)中,特定应用程序中用到的指令是软核CPU指令集的子集,如果在FPGA中实现软核CPU时仅保留应用程序用到的指令子集,将可以提高硬件资源利用率.文中分析了对应用程序进行指令统计的方法,重点介绍了通过修改HDL文件对8051软核CPU指令集进行删减和扩充的技术.采用这一技术设计的SOPC芯片硬件资源利用率得到了显著的提高,降低了系统成本,适用于可编程逻辑资源受到限制和对成本敏感的嵌入式应用中.展开更多
Computer system＇s runtime information is an essential part of the digital evidence. Current digital forensic approaches mainly focus on memory and I/O data, while the runtime instructions from processes are often ign...Computer system＇s runtime information is an essential part of the digital evidence. Current digital forensic approaches mainly focus on memory and I/O data, while the runtime instructions from processes are often ignored. We present a novel approach on runtime instruction forensic analysis and have developed a forensic system which collects instruction flow and extracts digital evidence. The system is based on whole-system emulation technique and analysts are allowed to define analysis strategy to improve analysis efficiency and reduce overhead. This forensic approach and system are applicable to binary code analysis, information retrieval and matware forensics.展开更多
文摘在可编程片上系统(System on P rogramm ab le Ch ip,SOPC)中,特定应用程序中用到的指令是软核CPU指令集的子集,如果在FPGA中实现软核CPU时仅保留应用程序用到的指令子集,将可以提高硬件资源利用率.文中分析了对应用程序进行指令统计的方法,重点介绍了通过修改HDL文件对8051软核CPU指令集进行删减和扩充的技术.采用这一技术设计的SOPC芯片硬件资源利用率得到了显著的提高,降低了系统成本,适用于可编程逻辑资源受到限制和对成本敏感的嵌入式应用中.
文摘Computer system＇s runtime information is an essential part of the digital evidence. Current digital forensic approaches mainly focus on memory and I/O data, while the runtime instructions from processes are often ignored. We present a novel approach on runtime instruction forensic analysis and have developed a forensic system which collects instruction flow and extracts digital evidence. The system is based on whole-system emulation technique and analysts are allowed to define analysis strategy to improve analysis efficiency and reduce overhead. This forensic approach and system are applicable to binary code analysis, information retrieval and matware forensics.
