Re: [Qemu-devel] [RFC 21/48] *-user: plugin syscalls

["Alex Bennée" <alex.bennee@linaro.org>]

Emilio G. Cota <cota@braap.org> writes:

> Signed-off-by: Emilio G. Cota <cota@braap.org>
> ---
>  bsd-user/syscall.c   | 9 +++++++++
>  linux-user/syscall.c | 3 +++
>  2 files changed, 12 insertions(+)
>
> diff --git a/bsd-user/syscall.c b/bsd-user/syscall.c
> index b7818af450..4993f81b2b 100644
> --- a/bsd-user/syscall.c
> +++ b/bsd-user/syscall.c
> @@ -323,6 +323,8 @@ abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
>      gemu_log("freebsd syscall %d\n", num);
>  #endif
>      trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
> +    qemu_plugin_vcpu_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7,
> +                             arg8);

I think we discussed this on my series about avoiding this sort of
duplication by providing a wrapper for trace points that are also plugin
hooks. So something like:

       trace_and_plugin_guest_user_syscall(...)

Although it's probably worth keeping the trace names grep-able so maybe:

       plug_trace_guest_user_syscall(...)

?
>      if(do_strace)
>          print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
>
> @@ -404,6 +406,7 @@ abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
>      if (do_strace)
>          print_freebsd_syscall_ret(num, ret);
>      trace_guest_user_syscall_ret(cpu, num, ret);
> +    qemu_plugin_vcpu_syscall_ret(cpu, num, ret);
>      return ret;
>   efault:
>      ret = -TARGET_EFAULT;
> @@ -422,6 +425,8 @@ abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
>      gemu_log("netbsd syscall %d\n", num);
>  #endif
>      trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, 0, 0);
> +    qemu_plugin_vcpu_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, 0,
> +                             0);
>      if(do_strace)
>          print_netbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
>
> @@ -480,6 +485,7 @@ abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
>      if (do_strace)
>          print_netbsd_syscall_ret(num, ret);
>      trace_guest_user_syscall_ret(cpu, num, ret);
> +    qemu_plugin_vcpu_syscall_ret(cpu, num, ret);
>      return ret;
>   efault:
>      ret = -TARGET_EFAULT;
> @@ -498,6 +504,8 @@ abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
>      gemu_log("openbsd syscall %d\n", num);
>  #endif
>      trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, 0, 0);
> +    qemu_plugin_vcpu_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, 0,
> +                             0);
>      if(do_strace)
>          print_openbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
>
> @@ -556,6 +564,7 @@ abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
>      if (do_strace)
>          print_openbsd_syscall_ret(num, ret);
>      trace_guest_user_syscall_ret(cpu, num, ret);
> +    qemu_plugin_vcpu_syscall_ret(cpu, num, ret);
>      return ret;
>   efault:
>      ret = -TARGET_EFAULT;
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index ae3c0dfef7..a6d17a9f37 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -11232,6 +11232,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>
>      trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4,
>                               arg5, arg6, arg7, arg8);
> +    qemu_plugin_vcpu_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7,
> +                             arg8);
>
>      if (unlikely(do_strace)) {
>          print_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
> @@ -11244,5 +11246,6 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>      }
>
>      trace_guest_user_syscall_ret(cpu, num, ret);
> +    qemu_plugin_vcpu_syscall_ret(cpu, num, ret);
>      return ret;
>  }


--
Alex Bennée