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: / usr / share / systemtap / tapset / linux / x86_64 /
Filename : sysc_get_thread_area.stp
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# get_thread_area ____________________________________________
/*
 * asmlinkage int
 * sys_get_thread_area(struct user_desc __user *u_info)
 * asmlinkage long sys32_get_thread_area(struct user_desc __user *u_info)
 */

@define _SYSCALL_GET_THREAD_AREA_NAME
%(
	name = "get_thread_area"
%)

@define _SYSCALL_GET_THREAD_AREA_ARGSTR
%(
	argstr = u_info_str
%)

@define _SYSCALL_GET_THREAD_AREA_REGARGS
%(
	u_info_uaddr = pointer_arg(1)
	u_info_str = _struct_user_desc_u(u_info_uaddr)
%)

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

# dw_get_thread_area _____________________________________________________

probe dw_syscall.get_thread_area = kernel.function("sys_get_thread_area") ?,
	kernel.function("sys32_get_thread_area") ?
{
	@_SYSCALL_GET_THREAD_AREA_NAME
	u_info_uaddr = $u_info
	u_info_str = _struct_user_desc_u(u_info_uaddr)
	@_SYSCALL_GET_THREAD_AREA_ARGSTR
}
probe dw_syscall.get_thread_area.return =
	kernel.function("sys_get_thread_area").return ?,
	kernel.function("sys32_get_thread_area").return ?
{
	@_SYSCALL_GET_THREAD_AREA_NAME
	@SYSC_RETVALSTR($return)
}

# nd_get_thread_area _____________________________________________________

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

probe nd1_syscall.get_thread_area = kprobe.function("sys_get_thread_area") ?,
	kprobe.function("sys32_get_thread_area") ?
{
	@_SYSCALL_GET_THREAD_AREA_NAME
	asmlinkage()
	@_SYSCALL_GET_THREAD_AREA_REGARGS
	@_SYSCALL_GET_THREAD_AREA_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.get_thread_area =
	kprobe.function(@arch_syscall_prefix "sys_get_thread_area") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_GET_THREAD_AREA_NAME
	@_SYSCALL_GET_THREAD_AREA_REGARGS
	@_SYSCALL_GET_THREAD_AREA_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.get_thread_area = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_get_thread_area"), @const("__NR_ia32_get_thread_area"))
	@_SYSCALL_GET_THREAD_AREA_NAME
	@_SYSCALL_GET_THREAD_AREA_REGARGS
	@_SYSCALL_GET_THREAD_AREA_ARGSTR
}

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

probe nd1_syscall.get_thread_area.return =
	kprobe.function("sys_get_thread_area").return ?,
	kprobe.function("sys32_get_thread_area").return ?
{
	@_SYSCALL_GET_THREAD_AREA_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.get_thread_area.return =
	kprobe.function(@arch_syscall_prefix "sys_get_thread_area").return ?
{
	@_SYSCALL_GET_THREAD_AREA_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.get_thread_area.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_get_thread_area"), @const("__NR_ia32_get_thread_area"))
	@_SYSCALL_GET_THREAD_AREA_NAME
	@SYSC_RETVALSTR($ret)
}