1#@!#!123s

: / usr / share / systemtap / tapset / linux /
Filename : sysc_shmget.stp
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# shmget _____________________________________________________
#
# long sys_shmget (key_t key,
#		 size_t size,
#		 int shmflg)
#

@define _SYSCALL_SHMGET_NAME
%(
	name = "shmget"
%)

@define _SYSCALL_SHMGET_ARGSTR
%(
	argstr = sprintf("%d, %u, %s", key, size, shmflg_str)
%)

@define _SYSCALL_SHMGET_REGARGS
%(
	key = int_arg(1)
	size = ulong_arg(2)
	shmflg = int_arg(3)
	shmflg_str = _stp_shmget_flags_str(shmflg)
%)

@define _SYSCALL_IPC_SHMGET_REGARGS
%(
	key = int_arg(2)
	size = ulong_arg(3)
	shmflg = int_arg(4)
	shmflg_str = _stp_shmget_flags_str(shmflg)
%)

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

# dw_shmget _____________________________________________________

probe dw_syscall.shmget = kernel.function("sys_shmget").call ?
{
	@_SYSCALL_SHMGET_NAME
	key = __int32($key)
	size = __ulong($size)
	shmflg = __int32($shmflg)
	shmflg_str = _stp_shmget_flags_str(__int32($shmflg))
	@_SYSCALL_SHMGET_ARGSTR
}
probe dw_syscall.shmget.return = kernel.function("sys_shmget").return ?
{
	@_SYSCALL_SHMGET_NAME
	@SYSC_RETVALSTR($return)
}

# nd_shmget _____________________________________________________

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

probe nd1_syscall.shmget = kprobe.function("sys_shmget") ?
{
	@_SYSCALL_SHMGET_NAME
	asmlinkage()
	@_SYSCALL_SHMGET_REGARGS
	@_SYSCALL_SHMGET_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.shmget = __nd2_syscall.shmget ?, __nd2_syscall.compat_ipc.shmget ?
{
	@_SYSCALL_SHMGET_NAME
	@_SYSCALL_SHMGET_ARGSTR
}
probe __nd2_syscall.shmget = kprobe.function(@arch_syscall_prefix "sys_shmget") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SHMGET_REGARGS
}
probe __nd2_syscall.compat_ipc.shmget =
	kprobe.function(@arch_syscall_prefix "compat_sys_ipc") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	if (int_arg(1) != @const("SHMGET")) next;
	@_SYSCALL_IPC_SHMGET_REGARGS
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.shmget = __tp_syscall.shmget, __tp_syscall.compat_ipc.shmget
{
	@_SYSCALL_SHMGET_NAME
	@_SYSCALL_SHMGET_ARGSTR
}
probe __tp_syscall.shmget = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_shmget"))
	@_SYSCALL_SHMGET_REGARGS
}
probe __tp_syscall.compat_ipc.shmget = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_ipc"))
	if (int_arg(1) != @const("SHMGET")) next;
	@_SYSCALL_IPC_SHMGET_REGARGS
}

probe nd_syscall.shmget.return = nd1_syscall.shmget.return!, nd2_syscall.shmget.return!, tp_syscall.shmget.return
  { }
  
probe nd1_syscall.shmget.return = kprobe.function("sys_shmget").return ?
{
	@_SYSCALL_SHMGET_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.shmget.return =
	kprobe.function(@arch_syscall_prefix "sys_shmget").return ?,
	__nd2_syscall.compat_ipc.shmget.return ?
{
	@_SYSCALL_SHMGET_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd2_syscall.compat_ipc.shmget.return =
	kprobe.function(@arch_syscall_prefix "compat_sys_ipc").return ?
{
	__set_syscall_pt_regs(@entry(pointer_arg(1)))
	if (int_arg(1) != @const("SHMGET")) next;
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.shmget.return = __tp_syscall.shmget.return,
	__tp_syscall.compat_ipc.shmget.return
{
	@_SYSCALL_SHMGET_NAME
	@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.shmget.return = kernel.trace("sys_exit")
{
	@__syscall_gate(@const("__NR_shmget"))
}
probe __tp_syscall.compat_ipc.shmget.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_ipc"))
	if (int_arg(1) != @const("SHMGET")) next;
}