linux-user的自修改代码

  • main: signal_init

    • linux-user/signal.c: 582: sigaction(host_sig, host_signal_handler, NULL)注册

  • 运行过程QEMU收到signal

    • host_signal_handler(int host_signum, void*pinfo, void *puc)
      • accel/tcg/user-exec.c: 253: cpu_signal_handler
        • 63: handle_cpu_signal(uintptr_t pc, siginfo_t *info, int is_write, sigset_t *old_set)
          • accel/tcg/translate-all.c: 151: page_unprotect(target_ulong address, uintptr_t pc)将页权限改为可些，且无效了对应TB

  • 翻译过程中将TB对应的页设置为不可写host和guest的PAGE_WRITE位，注：PAGE_WRITE_ORG用作表示该页是否原本可写

    • accel/tcg/translate-all.c: tb_gen_code
      • 1850: tb_link_page
        • 1606: tb_page_add