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Filename : sysc_sigsuspend.stp
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# sigsuspend _________________________________________________
# #ifdef CONFIG_OLD_SIGSUSPEND
# SYSCALL_DEFINE1(sigsuspend, old_sigset_t, mask)
# #endif
# #ifdef CONFIG_OLD_SIGSUSPEND3
# SYSCALL_DEFINE3(sigsuspend, int, unused1, int, unused2, old_sigset_t, mask)
# #endif
# asmlinkage long
# sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
# long sys_sigsuspend(old_sigset_t mask)

@define _SYSCALL_SIGSUSPEND_NAME
%(
	name = "sigsuspend"
%)

@define _SYSCALL_SIGSUSPEND_ARGSTR
%(
	argstr = sprintf("%s", mask_str)
%)

@define _SYSCALL_GATE
%(
%( arch == "s390" && kernel_v >= "3.15" %?
	# s390 switched from assembly compat wrappers to C-based
	# wrappers in kernel 3.15.
	@__syscall_gate_compat_simple
%)
%)

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

# dw_sigsuspend _____________________________________________________

probe dw_syscall.sigsuspend = __syscall.sigsuspend ?,
	kernel.function("sys32_sigsuspend").call ?,
	kernel.function("compat_sys_sigsuspend").call ?
{
	@_SYSCALL_SIGSUSPEND_NAME
%( arch == "mips" && CONFIG_TRAD_SIGNALS == "y" %?
	mask = __ulong($uset)
%:
	mask = __ulong($mask)
%)
	mask_str = _stp_sigmask_str(mask)
	@_SYSCALL_SIGSUSPEND_ARGSTR
}
probe __syscall.sigsuspend = kernel.function("sys_sigsuspend").call ?
{
	@_SYSCALL_GATE
}
probe dw_syscall.sigsuspend.return = __syscall.sigsuspend.return ?,
	kernel.function("sys32_sigsuspend").return ?,
	kernel.function("compat_sys_sigsuspend").return ?
{
	@_SYSCALL_SIGSUSPEND_NAME
	@SYSC_RETVALSTR($return)
}
probe __syscall.sigsuspend.return = kernel.function("sys_sigsuspend").return ?
{
	@_SYSCALL_GATE
}

# nd_sigsuspend _____________________________________________________

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

probe nd1_syscall.sigsuspend = __nd1_syscall.sigsuspend ?,
	__nd1_syscall.sys32_sigsuspend ?
{
	@_SYSCALL_SIGSUSPEND_NAME
	mask_str = _stp_sigmask_str(mask)
	@_SYSCALL_SIGSUSPEND_ARGSTR
}
probe __nd1_syscall.sigsuspend = __nd1_syscall.sys_sigsuspend ?,
	kprobe.function("compat_sys_sigsuspend") ?
{
	asmlinkage()
%( CONFIG_OLD_SIGSUSPEND == "y" %?
	mask = ulong_arg(1)
%:
	# CONFIG_OLD_SIGSUSPEND3 has mask as the 3rd argument.
	mask = ulong_arg(3)
%)
}
probe __nd1_syscall.sys_sigsuspend = kprobe.function("sys_sigsuspend") ?
{
	asmlinkage()
	@_SYSCALL_GATE
}
probe __nd1_syscall.sys32_sigsuspend = kprobe.function("sys32_sigsuspend") ?
{
	asmlinkage()
	mask = ulong_arg(3)
}

/* kernel 4.17+ */
probe nd2_syscall.sigsuspend =
	kprobe.function(@arch_syscall_prefix "sys_sigsuspend") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SIGSUSPEND_NAME
	mask = ulong_arg(3)
	mask_str = _stp_sigmask_str(mask)
	@_SYSCALL_SIGSUSPEND_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sigsuspend = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_sigsuspend"), @const("__NR_compat_sigsuspend"))
	@_SYSCALL_SIGSUSPEND_NAME
%( CONFIG_OLD_SIGSUSPEND == "y" %?
	mask = ulong_arg(1)
%:
	# CONFIG_OLD_SIGSUSPEND3 has mask as the 3rd argument.
	mask = ulong_arg(3)
%)
	mask_str = _stp_sigmask_str(mask)
	@_SYSCALL_SIGSUSPEND_ARGSTR
}

probe nd_syscall.sigsuspend.return = nd1_syscall.sigsuspend.return!, nd2_syscall.sigsuspend.return!, tp_syscall.sigsuspend.return
  { }

probe nd1_syscall.sigsuspend.return =
	__nd1_syscall.sigsuspend.return ?,
	kprobe.function("sys32_sigsuspend").return ?,
	kprobe.function("compat_sys_sigsuspend").return ?
{
	@_SYSCALL_SIGSUSPEND_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.sigsuspend.return =
	kprobe.function("sys_sigsuspend").return ?
{
	@_SYSCALL_GATE
}

/* kernel 4.17+ */
probe nd2_syscall.sigsuspend.return = kprobe.function(@arch_syscall_prefix "sys_sigsuspend").return ?
{
	@_SYSCALL_SIGSUSPEND_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sigsuspend.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_sigsuspend"), @const("__NR_compat_sigsuspend"))
	@_SYSCALL_SIGSUSPEND_NAME
	@SYSC_RETVALSTR($ret)
}