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Filename : sysc_mincore.stp
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# mincore ____________________________________________________
# long sys_mincore(unsigned long start, size_t len, unsigned char __user * vec)
#

@define _SYSCALL_MINCORE_NAME
%(
	name = "mincore"
%)

@define _SYSCALL_MINCORE_ARGSTR
%(
	argstr = sprintf("%p, %u, %p", start, length, vec_uaddr)
%)

@define _SYSCALL_MINCORE_REGARGS
%(
	start = pointer_arg(1)
	length = ulong_arg(2)
	vec_uaddr = pointer_arg(3)
%)

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

# dw_mincore _____________________________________________________

probe dw_syscall.mincore = kernel.function("sys_mincore").call ?
{
	@_SYSCALL_MINCORE_NAME
	start = $start
	length = __ulong($len)
	vec_uaddr = $vec
	@_SYSCALL_MINCORE_ARGSTR
}
probe dw_syscall.mincore.return = kernel.function("sys_mincore").return ?
{
	@_SYSCALL_MINCORE_NAME
	@SYSC_RETVALSTR($return)
}

# nd_mincore _____________________________________________________

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

probe nd1_syscall.mincore = kprobe.function("sys_mincore") ?
{
	@_SYSCALL_MINCORE_NAME
	asmlinkage()
	@_SYSCALL_MINCORE_REGARGS
	@_SYSCALL_MINCORE_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.mincore = kprobe.function(@arch_syscall_prefix "sys_mincore") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_MINCORE_NAME
	@_SYSCALL_MINCORE_REGARGS
	@_SYSCALL_MINCORE_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.mincore = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_mincore"), @const("__NR_compat_mincore"))
	@_SYSCALL_MINCORE_NAME
	@_SYSCALL_MINCORE_REGARGS
	@_SYSCALL_MINCORE_ARGSTR
}

probe nd_syscall.mincore.return = nd1_syscall.mincore.return!, nd2_syscall.mincore.return!, tp_syscall.mincore.return
  { }
  
probe nd1_syscall.mincore.return = kprobe.function("sys_mincore").return ?
{
	@_SYSCALL_MINCORE_NAME
	@SYSC_RETVALSTR(returnval())
}

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