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#!/usr/libexec/flua
--
-- SPDX-License-Identifier: BSD-2-Clause
--
-- 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 syscall_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")
-- File has not been decided yet; config will decide file. Default defined as
-- /dev/null.
syscall_h.file = "/dev/null"
-- Libc has all the STD, NOSTD and SYSMUX system calls in it, as well as
-- replaced system calls dating back to FreeBSD 7. We are lucky that the
-- system call filename is just the base symbol name for it.
function syscall_h.generate(tbl, config, fh)
-- Grab the master system calls table, and prepare bookkeeping for
-- the max system call number.
local s = tbl.syscalls
local max = 0
-- Bind the generator to the parameter file.
local gen = generator:new({}, fh)
-- Write the generated preamble.
gen:preamble("System call numbers.")
if config.syshdr_extra then
gen:write(string.format("%s\n\n", config.syshdr_extra))
end
for _, v in pairs(s) do
local c = v:compatLevel()
if v.num > max then
max = v.num
end
if v.type.UNIMPL then
goto skip
elseif v.type.RESERVED then
goto skip
elseif v.type.NODEF then
goto skip
elseif v.type.STD or v.type.NOSTD or v.type.SYSMUX or
c >= 7 then
gen:write(string.format("#define\t%s%s%s\t%d\n",
config.syscallprefix, v:compatPrefix(), v.name,
v.num))
elseif c >= 0 then
local comment
if c == 0 then
comment = "obsolete"
elseif c == 3 then
comment = "old"
else
comment = "freebsd" .. c
end
gen:write(string.format("\t\t\t\t/* %d is %s %s */\n",
v.num, comment, v.name))
end
::skip::
end
gen:write(string.format("#define\t%sMAXSYSCALL\t%d\n",
config.syscallprefix, max + 1))
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 system call table.
local tbl = FreeBSDSyscall:new{sysfile = sysfile, config = config}
syscall_h.file = config.syshdr -- change file here
syscall_h.generate(tbl, config, syscall_h.file)
end
-- Return the module.
return syscall_h
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