monitor,debug,log: fix buffer overflow after LOG_MAX

NJU-ProjectN / nemu

NJU EMUlator, a full system x86/mips32/riscv32/riscv64 emulator for teaching

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Closed sashimi-yzh closed 4 years ago

sashimi-yzh commented 4 years ago

Previously instr_fetch() still call strcatf() after LOG_MAX, but we only clear the buffer in the end of asm_print(), which is only invoked before LOG_MAX. This causes buffer overflow. To fix this , we clear the buffer after the execution of every instructions.