^^&&^^

Edit File: sysc_compat_readahead.stp

# readahead __________________________________________________
#
# asmlinkage ssize_t
# compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
# COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low,
#			 s32, count)
#

@define _SYSCALL_COMPAT_READAHEAD_NAME
%(
	name = "readahead"
%)

@define _SYSCALL_COMPAT_READAHEAD_ARGSTR
%(
	argstr = sprintf("%d, %d, %u", fd, offset, count)
%)

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

# dw_compat_readahead _____________________________________________________

probe dw_syscall.compat_readahead = kernel.function("sys32_readahead").call ?,
	kernel.function("compat_sys_s390_readahead").call ?
{
	@_SYSCALL_COMPAT_READAHEAD_NAME
	fd = __int32($fd)
	offset = ((@choose_defined($offhi, $high) << 32)
		  | __uint32(@choose_defined($offlo, $low)))
	count = __uint32($count)
	@_SYSCALL_COMPAT_READAHEAD_ARGSTR
}
probe dw_syscall.compat_readahead.return =
	kernel.function("sys32_readahead").return ?,
	kernel.function("compat_sys_s390_readahead").return ?
{
	@_SYSCALL_COMPAT_READAHEAD_NAME
	@SYSC_RETVALSTR($return)
}

# nd_compat_readahead _____________________________________________________

probe nd_syscall.compat_readahead = kprobe.function("sys32_readahead") ?,
	kprobe.function("compat_sys_s390_readahead") ?
{
	@_SYSCALL_COMPAT_READAHEAD_NAME
	asmlinkage()
	fd = int_arg(1)
	offset = ((uint_arg(2) << 32) | uint_arg(3))
	count = ulong_arg(4)
	@_SYSCALL_COMPAT_READAHEAD_ARGSTR
}
probe nd_syscall.compat_readahead.return =
	kprobe.function("sys32_readahead").return ?,
	kprobe.function("compat_sys_s390_readahead").return ?
{
	@_SYSCALL_COMPAT_READAHEAD_NAME
	@SYSC_RETVALSTR(returnval())
}