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# splice ___________________________________________________
#
# long sys_splice(int fd_in, loff_t __user *off_in,
# int fd_out, loff_t __user *off_out,
# size_t len, unsigned int flags)
#
@define _SYSCALL_SPLICE_NAME
%(
name = "splice"
%)
@define _SYSCALL_SPLICE_ARGSTR
%(
argstr = sprintf("%d, %p, %d, %p, %u, %s", fd_in, off_in, fd_out,
off_out, len, flags_str);
%)
@define _SYSCALL_SPLICE_REGARGS
%(
fd_in = int_arg(1)
off_in = pointer_arg(2)
fd_out = int_arg(3)
off_out = pointer_arg(4)
len = ulong_arg(5)
flags = uint_arg(6)
flags_str = (_stp_splice_flags_str(flags))
%)
@define _SYSCALL_SPLICE_REGARGS_STORE
%(
if (@probewrite(fd_in))
set_int_arg(1, fd_in)
if (@probewrite(off_in))
set_pointer_arg(2, off_in)
if (@probewrite(fd_out))
set_int_arg(3, fd_out)
if (@probewrite(off_out))
set_pointer_arg(4, off_out)
if (@probewrite(len))
set_ulong_arg(5, len)
if (@probewrite(flags))
set_uint_arg(6, flags)
%)
probe syscall.splice = dw_syscall.splice !, nd_syscall.splice ? {}
probe syscall.splice.return = dw_syscall.splice.return !,
nd_syscall.splice.return ? {}
# dw_splice _____________________________________________________
probe dw_syscall.splice = kernel.function("sys_splice").call ?
{
@_SYSCALL_SPLICE_NAME
fd_in = __int32($fd_in)
off_in = $off_in
fd_out = __int32($fd_out)
off_out = $off_out
len = __ulong($len)
flags = $flags
flags_str = (_stp_splice_flags_str(flags))
@_SYSCALL_SPLICE_ARGSTR
}
probe dw_syscall.splice.return = kernel.function("sys_splice").return ?
{
@_SYSCALL_SPLICE_NAME
@SYSC_RETVALSTR($return)
}
# nd_splice _____________________________________________________
probe nd_syscall.splice = nd1_syscall.splice!, nd2_syscall.splice!, tp_syscall.splice
{ }
probe nd1_syscall.splice = kprobe.function("sys_splice") ?
{
@_SYSCALL_SPLICE_NAME
asmlinkage()
@_SYSCALL_SPLICE_REGARGS
@_SYSCALL_SPLICE_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.splice = kprobe.function(@arch_syscall_prefix "sys_splice") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_SPLICE_NAME
@_SYSCALL_SPLICE_REGARGS
@_SYSCALL_SPLICE_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_SPLICE_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.splice = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_splice"), @const("__NR_compat_splice"))
@_SYSCALL_SPLICE_NAME
@_SYSCALL_SPLICE_REGARGS
@_SYSCALL_SPLICE_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_SPLICE_REGARGS_STORE %)
}
probe nd_syscall.splice.return = nd1_syscall.splice.return!, nd2_syscall.splice.return!, tp_syscall.splice.return
{ }
probe nd1_syscall.splice.return = kprobe.function("sys_splice").return ?
{
@_SYSCALL_SPLICE_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.splice.return = kprobe.function(@arch_syscall_prefix "sys_splice").return ?
{
@_SYSCALL_SPLICE_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.splice.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_splice"), @const("__NR_compat_splice"))
@_SYSCALL_SPLICE_NAME
@SYSC_RETVALSTR($ret)
}
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