D51673.diff
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	diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
	--- a/sys/kern/syscalls.master
	+++ b/sys/kern/syscalls.master
	@@ -51,6 +51,7 @@
	; SYSMUX syscall multiplexer. No prototype, argument struct, or
	; handler is declared or used. Handled in MD syscall code.
	; CAPENABLED syscall is allowed in capability mode
	+; NORETURN the syscall does not return
	;
	; To support programmatic generation of both the default ABI and 32-bit compat
	; (freebsd32) we impose a number of restrictions on the types of system calls.
	diff --git a/sys/tools/syscalls/core/syscall.lua b/sys/tools/syscalls/core/syscall.lua
	--- a/sys/tools/syscalls/core/syscall.lua
	+++ b/sys/tools/syscalls/core/syscall.lua
	@@ -28,6 +28,7 @@
	-- flags beyond this point are modifiers
	"CAPENABLED",
	"NOLIB",
	+ "NORETURN",
	"NOTSTATIC",
	"SYSMUX",
	}
	diff --git a/sys/tools/syscalls/scripts/libsys_h.lua b/sys/tools/syscalls/scripts/libsys_h.lua
	--- a/sys/tools/syscalls/scripts/libsys_h.lua
	+++ b/sys/tools/syscalls/scripts/libsys_h.lua
	@@ -76,8 +76,12 @@

	for _, v in pairs(s) do
	if print_decl(v) then
	- gen:write(string.format("%s __sys_%s(%s);\n",
	- v.ret, v.name, v.argstr_type_var))
	+ local ret_attr = "";
	+ if v.type.NORETURN then
	+ ret_attr = "_Noreturn "
	+ end
	+ gen:write(string.format("%s%s __sys_%s(%s);\n",
	+ ret_attr, v.ret, v.name, v.argstr_type_var))
	end
	end