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Filename : sysc_getpriority.stp
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# getpriority ________________________________________________
# long sys_getpriority(int which, int who)

@define _SYSCALL_GETPRIORITY_NAME
%(
	name = "getpriority"
%)

@define _SYSCALL_GETPRIORITY_ARGSTR
%(
	argstr = sprintf("%s, %d", _priority_which_str(which), who)
%)

@define _SYSCALL_GETPRIORITY_REGARGS
%(
	which = int_arg(1)
	who = int_arg(2)
%)

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

# dw_getpriority _____________________________________________________

probe dw_syscall.getpriority = kernel.function("sys_getpriority").call
{
	@_SYSCALL_GETPRIORITY_NAME
	which = __int32($which)
	who = __int32($who)
	@_SYSCALL_GETPRIORITY_ARGSTR
}
probe dw_syscall.getpriority.return = kernel.function("sys_getpriority").return
{
	@_SYSCALL_GETPRIORITY_NAME
	@SYSC_RETVALSTR($return)
}

# nd_getpriority _____________________________________________________

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

probe nd1_syscall.getpriority = kprobe.function("sys_getpriority") ?
{
	@_SYSCALL_GETPRIORITY_NAME
	asmlinkage()
	@_SYSCALL_GETPRIORITY_REGARGS
	@_SYSCALL_GETPRIORITY_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.getpriority = kprobe.function(@arch_syscall_prefix "sys_getpriority") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_GETPRIORITY_NAME
	@_SYSCALL_GETPRIORITY_REGARGS
	@_SYSCALL_GETPRIORITY_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getpriority = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_getpriority"), @const("__NR_compat_getpriority"))
	@_SYSCALL_GETPRIORITY_NAME
	@_SYSCALL_GETPRIORITY_REGARGS
	@_SYSCALL_GETPRIORITY_ARGSTR
}

probe nd_syscall.getpriority.return = nd1_syscall.getpriority.return!, nd2_syscall.getpriority.return!, tp_syscall.getpriority.return
  { }
  
probe nd1_syscall.getpriority.return = kprobe.function("sys_getpriority").return ?
{
	@_SYSCALL_GETPRIORITY_NAME
	@SYSC_RETVALSTR(returnval())
}

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