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Filename : sysc_time.stp
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# time _______________________________________________________
#
# long sys_time(time_t __user * tloc)
# long sys_time64(long __user * tloc)
# long sys32_time(compat_time_t __user * tloc)
# long compat_sys_time(compat_time_t __user * tloc)
#

@define _SYSCALL_TIME_NAME
%(
	name = "time"
%)

@define _SYSCALL_TIME_ARGSTR
%(
	argstr = sprintf("%p", t_uaddr)
%)

@define _SYSCALL_TIME_REGARGS
%(
	t_uaddr = pointer_arg(1)
%)

probe syscall.time = dw_syscall.time !, nd_syscall.time ? {}
probe syscall.time.return = dw_syscall.time.return !, nd_syscall.time.return ? {}

# dw_time _____________________________________________________

probe dw_syscall.time = kernel.function("sys32_time").call ?,
                     kernel.function("sys_time64").call ?,
                     kernel.function("compat_sys_time").call ?,
                     kernel.function("sys_time").call ?
{
	@_SYSCALL_TIME_NAME
	t_uaddr = $tloc
	@_SYSCALL_TIME_ARGSTR
}
probe dw_syscall.time.return = kernel.function("sys32_time").return ?,
                            kernel.function("sys_time64").return ?,
                            kernel.function("compat_sys_time").return ?,
                            kernel.function("sys_time").return ?
{
	@_SYSCALL_TIME_NAME
	@SYSC_RETVALSTR($return)
}

# nd_time _____________________________________________________

probe nd_syscall.time = nd1_syscall.time!, nd2_syscall.time!, tp_syscall.time
  { }

probe nd1_syscall.time = kprobe.function("sys32_time") ?,
                        kprobe.function("sys_time64") ?,
                        kprobe.function("compat_sys_time") ?,
                        kprobe.function("sys_time") ?
{
	@_SYSCALL_TIME_NAME
	asmlinkage()
	@_SYSCALL_TIME_REGARGS
	@_SYSCALL_TIME_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.time = kprobe.function(@arch_syscall_prefix "sys_time") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_time") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_TIME_NAME
	@_SYSCALL_TIME_REGARGS
	@_SYSCALL_TIME_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.time = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_time"), @const("__NR_compat_time"))
	@_SYSCALL_TIME_NAME
	@_SYSCALL_TIME_REGARGS
	@_SYSCALL_TIME_ARGSTR
}

probe nd_syscall.time.return = nd1_syscall.time.return!, nd2_syscall.time.return!, tp_syscall.time.return
  { }
  
probe nd1_syscall.time.return = kprobe.function("sys32_time").return ?,
                               kprobe.function("sys_time64").return ?,
                               kprobe.function("compat_sys_time").return ?,
                               kprobe.function("sys_time").return ?
{
	@_SYSCALL_TIME_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.time.return = kprobe.function(@arch_syscall_prefix "sys_time").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_time") ?
{
	@_SYSCALL_TIME_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.time.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_time"), @const("__NR_compat_time"))
	@_SYSCALL_TIME_NAME
	@SYSC_RETVALSTR($ret)
}