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trace: [*-user] Add events to trace guest syscalls in syscall emulation mode

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Adds two events to trace syscalls in syscall emulation mode (*-user):

* guest_user_syscall: Emitted before the syscall is emulated; contains
  the syscall number and arguments.

* guest_user_syscall_ret: Emitted after the syscall is emulated;
  contains the syscall number and return value.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Message-id: 146651712411.12388.10024905980452504938.stgit@fimbulvetr.bsc.es
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Lluís Vilanova 2016-06-21 15:52:04 +02:00 • committed by Stefan Hajnoczi
parent 06a1e0c197
commit 9c15e70086
3 changed files with 27 additions and 0 deletions
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2
linux-user/syscall.c
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@ -6690,6 +6690,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
#ifdef DEBUG
gemu_log("syscall %d", num);
#endif
trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
if(do_strace)
print_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
@ -11182,6 +11183,7 @@ fail:
#endif
if(do_strace)
print_syscall_ret(num, ret);
trace_guest_user_syscall_ret(cpu, num, ret);
return ret;
efault:
ret = -TARGET_EFAULT;