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#!/usr/libexec/flua
--
-- SPDX-License-Identifier: BSD-2-Clause
--
-- Copyright (c) 2024 SRI International
-- Copyright (c) 2024 Tyler Baxter <agge@FreeBSD.org>
-- Copyright (c) 2023 Warner Losh <imp@bsdimp.com>
-- Copyright (c) 2019 Kyle Evans <kevans@FreeBSD.org>
--
-- Setup to be a module, or ran as its own script.
local libsys_h = {}
local script = not pcall(debug.getlocal, 4, 1) -- TRUE if script.
if script then
-- Add library root to the package path.
local path = arg[0]:gsub("/[^/]+.lua$", "")
package.path = package.path .. ";" .. path .. "/../?.lua"
end
local FreeBSDSyscall = require("core.freebsd-syscall")
local generator = require("tools.generator")
local util = require("tools.util")
-- File has not been decided yet; config will decide file. Default defined as
-- /dev/null.
libsys_h.file = "/dev/null"
function libsys_h.generate(tbl, config, fh)
-- Grab the master system calls table.
local s = tbl.syscalls
local print_decl = function (sc)
return sc:native() and not sc.type.NODEF and
not sc.type.NOLIB and not sc.type.SYSMUX
end
-- Bind the generator to the parameter file.
local gen = generator:new({}, fh)
-- Write the generated preamble.
gen:preamble("Public system call stubs provided by libsys.\n" ..
"\n" ..
"Do not use directly, include <libsys.h> instead.")
gen:write(string.format([[
#ifndef __LIBSYS_H_
#define __LIBSYS_H_
#include <sys/_cpuset.h>
#include <sys/_domainset.h>
#include <sys/_ffcounter.h>
#include <sys/_semaphore.h>
#include <sys/_sigaltstack.h>
#include <machine/ucontext.h> /* for mcontext_t */
#include <sys/_ucontext.h>
#include <sys/wait.h>
]]))
for name, _ in util.pairsByKeys(tbl.structs) do
gen:write(string.format("struct %s;\n", name))
end
gen:write("union semun;\n")
gen:write("\n__BEGIN_DECLS\n")
for _, v in pairs(s) do
if print_decl(v) then
gen:write(string.format(
"typedef %s (__sys_%s_t)(%s);\n",
v.ret, v.name, v.argstr_type))
end
end
gen:write("\n")
for _, v in pairs(s) do
if print_decl(v) then
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
gen:write("__END_DECLS\n")
-- End
gen:write("\n#endif /* __LIBSYS_H_ */\n")
end
-- Entry of script:
if script then
local config = require("config")
if #arg < 1 or #arg > 2 then
error("usage: " .. arg[0] .. " syscall.master")
end
local sysfile, configfile = arg[1], arg[2]
config.merge(configfile)
config.mergeCompat()
-- The parsed syscall table.
local tbl = FreeBSDSyscall:new{sysfile = sysfile, config = config}
libsys_h.file = config.libsys_h -- change file here
libsys_h.generate(tbl, config, libsys_h.file)
end
-- Return the module.
return libsys_h
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