asmlinkage int syscall_trace_enter(struct pt_regs *regs)
{
unsigned int saved_syscallno = regs->syscallno;
/* Do the secure computing check first; failures should be fast. */
if (secure_computing(regs->syscallno) == -1)
return RET_SKIP_SYSCALL_TRACE;
if (test_thread_flag_relaxed(TIF_SYSCALL_TRACE))
tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
if (IS_SKIP_SYSCALL(regs->syscallno)) {
/*
* RESTRICTION: we can't modify a return value of user
* issued syscall(-1) here. In order to ease this flavor,
* we need to treat whatever value in x0 as a return value,
* but this might result in a bogus value being returned.
*/
/*
* NOTE: syscallno may also be set to -1 if fatal signal is
* detected in tracehook_report_syscall_entry(), but since
* a value set to x0 here is not used in this case, we may
* neglect the case.
*/
if (!test_thread_flag_relaxed(TIF_SYSCALL_TRACE) ||
(IS_SKIP_SYSCALL(saved_syscallno)))
regs->regs[0] = -ENOSYS;
}
audit_syscall_entry(syscall_get_arch(), regs->syscallno,
regs->orig_x0, regs->regs[1], regs->regs[2], regs->regs[3]);
return regs->syscallno;
}
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
{
audit_syscall_exit(regs);
if (test_thread_flag_relaxed(TIF_SYSCALL_TRACEPOINT))
trace_sys_exit(regs, regs_return_value(regs));
if (test_thread_flag_relaxed(TIF_SYSCALL_TRACE))
tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);
}
asmlinkage int syscall_trace_enter(struct pt_regs *regs)
{
/* Do the secure computing check first; failures should be fast. */
if (secure_computing() == -1)
return -1;
if (test_thread_flag_relaxed(TIF_SYSCALL_TRACE))
tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
if (test_thread_flag_relaxed(TIF_SYSCALL_TRACEPOINT))
trace_sys_enter(regs, regs->syscallno);
audit_syscall_entry(syscall_get_arch(), regs->syscallno,
regs->orig_x0, regs->regs[1], regs->regs[2], regs->regs[3]);
return regs->syscallno;
}
