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Filename : sysc_alarm.stp
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# alarm ______________________________________________________
# unsigned long sys_alarm (unsigned int seconds)
# long sys32_alarm(unsigned int seconds)
#

@define _SYSCALL_ALARM_NAME
%(
	name = "alarm"
%)

@define _SYSCALL_ALARM_ARGSTR
%(
	argstr = sprint(seconds)
%)

@define _SYSCALL_ALARM_REGARGS
%(
	seconds = uint_arg(1)
%)

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

# dw_alarm _____________________________________________________

probe dw_syscall.alarm = kernel.function("sys32_alarm").call ?,
                      kernel.function("sys_alarm").call ?
{
	@_SYSCALL_ALARM_NAME
	seconds = __uint32($seconds)
	@_SYSCALL_ALARM_ARGSTR
}
probe dw_syscall.alarm.return = kernel.function("sys32_alarm").return ?,
                             kernel.function("sys_alarm").return ?
{
	@_SYSCALL_ALARM_NAME
	@SYSC_RETVALSTR($return)
}

# nd_alarm _____________________________________________________

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

probe nd1_syscall.alarm = kprobe.function("sys32_alarm") ?,
                          kprobe.function("sys_alarm") ?
{
	@_SYSCALL_ALARM_NAME
	asmlinkage()
	@_SYSCALL_ALARM_REGARGS
	@_SYSCALL_ALARM_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.alarm = kprobe.function(@arch_syscall_prefix "sys_alarm") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_ALARM_NAME
	@_SYSCALL_ALARM_REGARGS
	@_SYSCALL_ALARM_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.alarm = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_alarm"), @const("__NR_compat_alarm"))
	@_SYSCALL_ALARM_NAME
	@_SYSCALL_ALARM_REGARGS
	@_SYSCALL_ALARM_ARGSTR
}

probe nd_syscall.alarm.return = nd1_syscall.alarm.return!, nd2_syscall.alarm.return!, tp_syscall.alarm.return
  { }
  
probe nd1_syscall.alarm.return = kprobe.function("sys32_alarm").return ?,
                                 kprobe.function("sys_alarm").return ?
{
	@_SYSCALL_ALARM_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.alarm.return = kprobe.function(@arch_syscall_prefix "sys_alarm").return ?
{
	@_SYSCALL_ALARM_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.alarm.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_alarm"), @const("__NR_compat_alarm"))
	@_SYSCALL_ALARM_NAME
	@SYSC_RETVALSTR($ret)
}