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makesyscalls.lua
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makesyscalls.lua
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--
-- SPDX-License-Identifier: BSD-2-Clause
--
-- Copyright (c) 2019 Kyle Evans <[email protected]>
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
-- 1. Redistributions of source code must retain the above copyright
-- notice, this list of conditions and the following disclaimer.
-- 2. Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-- SUCH DAMAGE.
--
-- We generally assume that this script will be run by flua, however we've
-- carefully crafted modules for it that mimic interfaces provided by modules
-- available in ports. Currently, this script is compatible with lua from ports
-- along with the compatible luafilesystem and lua-posix modules.
local lfs = require("lfs")
local unistd = require("posix.unistd")
local savesyscall = -1
local maxsyscall = -1
local structs = {}
local generated_tag = "@" .. "generated"
-- Default configuration; any of these may get replaced by a configuration file
-- optionally specified.
local config = {
os_id_keyword = "FreeBSD", -- obsolete, ignored on input, not generated
abi_func_prefix = "",
libsysmap = "/dev/null",
libsys_h = "/dev/null",
sysnames = "syscalls.c",
sysproto = "../sys/sysproto.h",
sysproto_h = "_SYS_SYSPROTO_H_",
syshdr = "../sys/syscall.h",
sysmk = "/dev/null",
syssw = "init_sysent.c",
syscallprefix = "SYS_",
switchname = "sysent",
namesname = "syscallnames",
systrace = "systrace_args.c",
capabilities_conf = "capabilities.conf",
capenabled = {},
compat_set = "native",
mincompat = 0,
abi_type_suffix = "",
abi_flags = "",
abi_flags_mask = 0,
abi_headers = "",
abi_intptr_t = "intptr_t",
abi_size_t = "size_t",
abi_u_long = "u_long",
abi_long = "long",
abi_semid_t = "semid_t",
abi_ptr_array_t = "",
ptr_intptr_t_cast = "intptr_t",
syscall_abi_change = "",
sys_abi_change = {},
syscall_no_abi_change = "",
sys_no_abi_change = {},
obsol = "",
obsol_dict = {},
unimpl = "",
unimpl_dict = {},
}
local config_modified = {}
local cleantmp = true
local tmpspace = "/tmp/sysent." .. unistd.getpid() .. "/"
local output_files = {
"sysnames",
"syshdr",
"sysmk",
"libsysmap",
"libsys_h",
"syssw",
"systrace",
"sysproto",
}
-- These ones we'll create temporary files for; generation purposes.
local temp_files = {
"libsys_h_type",
"libsys_h_func",
"sysaue",
"sysdcl",
"syscompat",
"syscompatdcl",
"sysent",
"sysinc",
"sysarg",
"sysprotoend",
"systracetmp",
"systraceret",
}
-- Opened files
local files = {}
local function cleanup()
for _, v in pairs(files) do
assert(v:close())
end
if cleantmp then
if lfs.dir(tmpspace) then
for fname in lfs.dir(tmpspace) do
if fname ~= "." and fname ~= ".." then
assert(os.remove(tmpspace .. "/" ..
fname))
end
end
end
if lfs.attributes(tmpspace) and not lfs.rmdir(tmpspace) then
assert(io.stderr:write("Failed to clean up tmpdir: " ..
tmpspace .. "\n"))
end
else
assert(io.stderr:write("Temp files left in " .. tmpspace ..
"\n"))
end
end
local function abort(status, msg)
assert(io.stderr:write(msg .. "\n"))
cleanup()
os.exit(status)
end
-- Each entry should have a value so we can represent abi flags as a bitmask
-- for convenience. One may also optionally provide an expr; this gets applied
-- to each argument type to indicate whether this argument is subject to ABI
-- change given the configured flags.
local known_abi_flags = {
long_size = {
value = 0x00000001,
exprs = {
"_Contains[a-z_]*_long_",
"^long [a-z0-9_]+$",
"long [*]",
"size_t [*]",
-- semid_t is not included because it is only used
-- as an argument or written out individually and
-- said writes are handled by the ksem framework.
-- Technically a sign-extension issue exists for
-- arguments, but because semid_t is actually a file
-- descriptor negative 32-bit values are invalid
-- regardless of sign-extension.
},
},
time_t_size = {
value = 0x00000002,
exprs = {
"_Contains[a-z_]*_timet_",
},
},
pointer_args = {
value = 0x00000004,
},
pointer_size = {
value = 0x00000008,
exprs = {
"_Contains[a-z_]*_ptr_",
"[*][*]",
},
},
pair_64bit = {
value = 0x00000010,
exprs = {
"^dev_t[ ]*$",
"^id_t[ ]*$",
"^off_t[ ]*$",
},
},
}
local known_flags = {
STD = 0x00000001,
OBSOL = 0x00000002,
RESERVED = 0x00000004,
UNIMPL = 0x00000008,
NODEF = 0x00000010,
NOARGS = 0x00000020,
NOPROTO = 0x00000040,
NOSTD = 0x00000080,
NOTSTATIC = 0x00000100,
CAPENABLED = 0x00000200,
SYSMUX = 0x00000400,
-- Compat flags start from here. We have plenty of space.
}
-- All compat option entries should have five entries:
-- definition: The preprocessor macro that will be set for this
-- compatlevel: The level this compatibility should be included at. This
-- generally represents the version of FreeBSD that it is compatible
-- with, but ultimately it's just the level of mincompat in which it's
-- included.
-- flag: The name of the flag in syscalls.master.
-- prefix: The prefix to use for _args and syscall prototype. This will be
-- used as-is, without "_" or any other character appended.
-- descr: The description of this compat option in init_sysent.c comments.
-- The special "stdcompat" entry will cause the other five to be autogenerated.
local compat_option_sets = {
native = {
{
definition = "COMPAT_43",
compatlevel = 3,
flag = "COMPAT",
prefix = "o",
descr = "old",
},
{ stdcompat = "FREEBSD4" },
{ stdcompat = "FREEBSD6" },
{ stdcompat = "FREEBSD7" },
{ stdcompat = "FREEBSD10" },
{ stdcompat = "FREEBSD11" },
{ stdcompat = "FREEBSD12" },
{ stdcompat = "FREEBSD13" },
{ stdcompat = "FREEBSD14" },
},
}
-- compat_options will be resolved to a set from the configuration.
local compat_options
local function trim(s, char)
if s == nil then
return nil
end
if char == nil then
char = "%s"
end
return s:gsub("^" .. char .. "+", ""):gsub(char .. "+$", "")
end
-- config looks like a shell script; in fact, the previous makesyscalls.sh
-- script actually sourced it in. It had a pretty common format, so we should
-- be fine to make various assumptions
local function process_config(file)
local cfg = {}
local comment_line_expr = "^%s*#.*"
-- We capture any whitespace padding here so we can easily advance to
-- the end of the line as needed to check for any trailing bogus bits.
-- Alternatively, we could drop the whitespace and instead try to
-- use a pattern to strip out the meaty part of the line, but then we
-- would need to sanitize the line for potentially special characters.
local line_expr = "^([%w%p]+%s*)=(%s*[`\"]?[^\"`]*[`\"]?)"
if not file then
return nil, "No file given"
end
local fh = assert(io.open(file))
for nextline in fh:lines() do
-- Strip any whole-line comments
nextline = nextline:gsub(comment_line_expr, "")
-- Parse it into key, value pairs
local key, value = nextline:match(line_expr)
if key ~= nil and value ~= nil then
local kvp = key .. "=" .. value
key = trim(key)
value = trim(value)
local delim = value:sub(1,1)
if delim == '"' then
local trailing_context
-- Strip off the key/value part
trailing_context = nextline:sub(kvp:len() + 1)
-- Strip off any trailing comment
trailing_context = trailing_context:gsub("#.*$",
"")
-- Strip off leading/trailing whitespace
trailing_context = trim(trailing_context)
if trailing_context ~= "" then
print(trailing_context)
abort(1, "Malformed line: " .. nextline)
end
value = trim(value, delim)
else
-- Strip off potential comments
value = value:gsub("#.*$", "")
-- Strip off any padding whitespace
value = trim(value)
if value:match("%s") then
abort(1, "Malformed config line: " ..
nextline)
end
end
cfg[key] = value
elseif not nextline:match("^%s*$") then
-- Make sure format violations don't get overlooked
-- here, but ignore blank lines. Comments are already
-- stripped above.
abort(1, "Malformed config line: " .. nextline)
end
end
assert(io.close(fh))
return cfg
end
local function grab_capenabled(file, open_fail_ok)
local capentries = {}
local commentExpr = "#.*"
if file == nil then
print "No file"
return {}
end
local fh = io.open(file)
if fh == nil then
if not open_fail_ok then
abort(1, "Failed to open " .. file)
end
return {}
end
for nextline in fh:lines() do
-- Strip any comments
nextline = nextline:gsub(commentExpr, "")
if nextline ~= "" then
capentries[nextline] = true
end
end
assert(io.close(fh))
return capentries
end
local function process_compat()
local nval = 0
for _, v in pairs(known_flags) do
if v > nval then
nval = v
end
end
nval = nval << 1
for _, v in pairs(compat_options) do
if v.stdcompat ~= nil then
local stdcompat = v.stdcompat
v.definition = "COMPAT_" .. stdcompat:upper()
v.compatlevel = tonumber(stdcompat:match("([0-9]+)$"))
v.flag = stdcompat:gsub("FREEBSD", "COMPAT")
v.prefix = stdcompat:lower() .. "_"
v.descr = stdcompat:lower()
end
local tmpname = "sys" .. v.flag:lower()
local dcltmpname = tmpname .. "dcl"
files[tmpname] = io.tmpfile()
files[dcltmpname] = io.tmpfile()
v.tmp = tmpname
v.dcltmp = dcltmpname
known_flags[v.flag] = nval
v.mask = nval
nval = nval << 1
v.count = 0
end
end
local function process_abi_flags()
local flags, mask = config.abi_flags, 0
for txtflag in flags:gmatch("([^|]+)") do
if known_abi_flags[txtflag] == nil then
abort(1, "Unknown abi_flag: " .. txtflag)
end
mask = mask | known_abi_flags[txtflag].value
end
config.abi_flags_mask = mask
end
local function process_obsol()
local obsol = config.obsol
for syscall in obsol:gmatch("([^ ]+)") do
config.obsol_dict[syscall] = true
end
end
local function process_unimpl()
local unimpl = config.unimpl
for syscall in unimpl:gmatch("([^ ]+)") do
config.unimpl_dict[syscall] = true
end
end
local function process_syscall_abi_change()
local changes_abi = config.syscall_abi_change
for syscall in changes_abi:gmatch("([^ ]+)") do
config.sys_abi_change[syscall] = true
end
local no_changes = config.syscall_no_abi_change
for syscall in no_changes:gmatch("([^ ]+)") do
config.sys_no_abi_change[syscall] = true
end
end
local function abi_changes(name)
if known_abi_flags[name] == nil then
abort(1, "abi_changes: unknown flag: " .. name)
end
return config.abi_flags_mask & known_abi_flags[name].value ~= 0
end
local function strip_abi_prefix(funcname)
local abiprefix = config.abi_func_prefix
local stripped_name
if funcname == nil then
return nil
end
if abiprefix ~= "" and funcname:find("^" .. abiprefix) then
stripped_name = funcname:gsub("^" .. abiprefix, "")
else
stripped_name = funcname
end
return stripped_name
end
local function read_file(tmpfile)
if files[tmpfile] == nil then
print("Not found: " .. tmpfile)
return
end
local fh = files[tmpfile]
assert(fh:seek("set"))
return assert(fh:read("a"))
end
local function write_line(tmpfile, line)
if files[tmpfile] == nil then
print("Not found: " .. tmpfile)
return
end
assert(files[tmpfile]:write(line))
end
local function write_line_pfile(tmppat, line)
for k in pairs(files) do
if k:match(tmppat) ~= nil then
assert(files[k]:write(line))
end
end
end
-- Check both literal intptr_t and the abi version because this needs
-- to work both before and after the substitution
local function isptrtype(type)
return type:find("*") or type:find("caddr_t") or
type:find("intptr_t") or type:find(config.abi_intptr_t)
end
local function isptrarraytype(type)
return type:find("[*][*]") or type:find("[*][ ]*const[ ]*[*]")
end
-- Find types that are always 64-bits wide
local function is64bittype(type)
return type:find("^dev_t[ ]*$") or type:find("^id_t[ ]*$") or type:find("^off_t[ ]*$")
end
local process_syscall_def
-- These patterns are processed in order on any line that isn't empty.
local pattern_table = {
{
-- To be removed soon
pattern = "%s*$" .. config.os_id_keyword,
process = function(_, _)
-- Ignore... ID tag
end,
},
{
dump_prevline = true,
pattern = "^#%s*include",
process = function(line)
line = line .. "\n"
write_line("sysinc", line)
end,
},
{
dump_prevline = true,
pattern = "^#",
process = function(line)
if line:find("^#%s*if") then
savesyscall = maxsyscall
elseif line:find("^#%s*else") then
maxsyscall = savesyscall
end
line = line .. "\n"
write_line("sysent", line)
write_line("sysdcl", line)
write_line("sysarg", line)
write_line_pfile("syscompat[0-9]*$", line)
write_line("sysnames", line)
write_line_pfile("systrace.*", line)
end,
},
{
dump_prevline = true,
pattern = "%%ABI_HEADERS%%",
process = function()
if config.abi_headers ~= "" then
local line = config.abi_headers .. "\n"
write_line("sysinc", line)
end
end,
},
{
-- Buffer anything else
pattern = ".+",
process = function(line, prevline)
local incomplete = line:find("\\$") ~= nil
-- Lines that end in \ get the \ stripped
-- Lines that start with a syscall number, prepend \n
line = trim(line):gsub("\\$", "")
if line:find("^[0-9]") and prevline then
process_syscall_def(prevline)
prevline = nil
end
prevline = (prevline or '') .. line
incomplete = incomplete or prevline:find(",$") ~= nil
incomplete = incomplete or prevline:find("{") ~= nil and
prevline:find("}") == nil
if prevline:find("^[0-9]") and not incomplete then
process_syscall_def(prevline)
prevline = nil
end
return prevline
end,
},
}
local function process_sysfile(file)
local capentries = {}
local commentExpr = "^%s*;.*"
if file == nil then
print "No file"
return {}
end
local fh = io.open(file)
if fh == nil then
print("Failed to open " .. file)
return {}
end
local function do_match(nextline, prevline)
local pattern, handler, dump
for _, v in pairs(pattern_table) do
pattern = v.pattern
handler = v.process
dump = v.dump_prevline
if nextline:match(pattern) then
if dump and prevline then
process_syscall_def(prevline)
prevline = nil
end
return handler(nextline, prevline)
end
end
abort(1, "Failed to handle: " .. nextline)
end
local prevline
for nextline in fh:lines() do
-- Strip any comments
nextline = nextline:gsub(commentExpr, "")
if nextline ~= "" then
prevline = do_match(nextline, prevline)
end
end
-- Dump any remainder
if prevline ~= nil and prevline:find("^[0-9]") then
process_syscall_def(prevline)
end
assert(io.close(fh))
return capentries
end
local function get_mask(flags)
local mask = 0
for _, v in ipairs(flags) do
if known_flags[v] == nil then
abort(1, "Checking for unknown flag " .. v)
end
mask = mask | known_flags[v]
end
return mask
end
local function get_mask_pat(pflags)
local mask = 0
for k, v in pairs(known_flags) do
if k:find(pflags) then
mask = mask | v
end
end
return mask
end
local function strip_arg_annotations(arg)
arg = arg:gsub("_Contains_[^ ]*[_)] ?", "")
arg = arg:gsub("_In[^ ]*[_)] ?", "")
arg = arg:gsub("_Out[^ ]*[_)] ?", "")
return trim(arg)
end
local function check_abi_changes(arg)
for k, v in pairs(known_abi_flags) do
local exprs = v.exprs
if abi_changes(k) and exprs ~= nil then
for _, e in pairs(exprs) do
if arg:find(e) then
return true
end
end
end
end
return false
end
local function process_args(args)
local funcargs = {}
local changes_abi = false
for arg in args:gmatch("([^,]+)") do
local arg_abi_change = check_abi_changes(arg)
changes_abi = changes_abi or arg_abi_change
arg = strip_arg_annotations(arg)
local argname = arg:match("([^* ]+)$")
-- argtype is... everything else.
local argtype = trim(arg:gsub(argname .. "$", ""), nil)
if argtype == "" and argname == "void" then
goto out
end
-- is64bittype() needs a bare type so check it after argname
-- is removed
changes_abi = changes_abi or (abi_changes("pair_64bit") and is64bittype(argtype))
argtype = argtype:gsub("intptr_t", config.abi_intptr_t)
argtype = argtype:gsub("semid_t", config.abi_semid_t)
if isptrtype(argtype) then
argtype = argtype:gsub("size_t", config.abi_size_t)
argtype = argtype:gsub("^long", config.abi_long);
argtype = argtype:gsub("^u_long", config.abi_u_long);
argtype = argtype:gsub("^const u_long", "const " .. config.abi_u_long);
elseif argtype:find("^long$") then
argtype = config.abi_long
end
if isptrarraytype(argtype) and config.abi_ptr_array_t ~= "" then
-- `* const *` -> `**`
argtype = argtype:gsub("[*][ ]*const[ ]*[*]", "**")
-- e.g., `struct aiocb **` -> `uint32_t *`
argtype = argtype:gsub("[^*]*[*]", config.abi_ptr_array_t .. " ", 1)
end
-- XX TODO: Forward declarations? See: sysstubfwd in CheriBSD
if arg_abi_change then
local abi_type_suffix = config.abi_type_suffix
argtype = argtype:gsub("(struct [^ ]*)", "%1" ..
abi_type_suffix)
argtype = argtype:gsub("(union [^ ]*)", "%1" ..
abi_type_suffix)
end
if abi_changes("pair_64bit") and is64bittype(argtype) then
if #funcargs % 2 == 1 then
funcargs[#funcargs + 1] = {
type = "int",
name = "_pad",
}
end
funcargs[#funcargs + 1] = {
type = "uint32_t",
name = argname .. "1",
}
funcargs[#funcargs + 1] = {
type = "uint32_t",
name = argname .. "2",
}
else
funcargs[#funcargs + 1] = {
type = argtype,
name = argname,
}
end
end
::out::
return funcargs, changes_abi
end
local function handle_noncompat(sysnum, thr_flag, flags, sysflags, rettype,
auditev, syscallret, funcname, funcalias, funcargs, argalias)
local argssize
if flags & known_flags.SYSMUX ~= 0 then
argssize = "0"
elseif #funcargs > 0 or flags & known_flags.NODEF ~= 0 then
argssize = "AS(" .. argalias .. ")"
else
argssize = "0"
end
write_line("systrace", string.format([[
/* %s */
case %d: {
]], funcname, sysnum))
write_line("systracetmp", string.format([[
/* %s */
case %d:
]], funcname, sysnum))
write_line("systraceret", string.format([[
/* %s */
case %d:
]], funcname, sysnum))
if #funcargs > 0 and flags & known_flags.SYSMUX == 0 then
write_line("systracetmp", "\t\tswitch (ndx) {\n")
write_line("systrace", string.format(
"\t\tstruct %s *p = params;\n", argalias))
local argtype, argname, desc, padding
padding = ""
for idx, arg in ipairs(funcargs) do
argtype = arg.type
argname = arg.name
argtype = trim(argtype:gsub("__restrict$", ""), nil)
if argtype == "int" and argname == "_pad" and abi_changes("pair_64bit") then
write_line("systracetmp", "#ifdef PAD64_REQUIRED\n")
end
-- Pointer arg?
if argtype:find("*") then
desc = "userland " .. argtype
else
desc = argtype;
end
write_line("systracetmp", string.format(
"\t\tcase %d%s:\n\t\t\tp = \"%s\";\n\t\t\tbreak;\n",
idx - 1, padding, desc))
if argtype == "int" and argname == "_pad" and abi_changes("pair_64bit") then
padding = " - _P_"
write_line("systracetmp", "#define _P_ 0\n#else\n#define _P_ 1\n#endif\n")
end
if isptrtype(argtype) then
write_line("systrace", string.format(
"\t\tuarg[a++] = (%s)p->%s; /* %s */\n",
config.ptr_intptr_t_cast,
argname, argtype))
elseif argtype == "union l_semun" then
write_line("systrace", string.format(
"\t\tuarg[a++] = p->%s.buf; /* %s */\n",
argname, argtype))
elseif argtype:sub(1,1) == "u" or argtype == "size_t" then
write_line("systrace", string.format(
"\t\tuarg[a++] = p->%s; /* %s */\n",
argname, argtype))
else
if argtype == "int" and argname == "_pad" and abi_changes("pair_64bit") then
write_line("systrace", "#ifdef PAD64_REQUIRED\n")
end
write_line("systrace", string.format(
"\t\tiarg[a++] = p->%s; /* %s */\n",
argname, argtype))
if argtype == "int" and argname == "_pad" and abi_changes("pair_64bit") then
write_line("systrace", "#endif\n")
end
end
end
write_line("systracetmp",
"\t\tdefault:\n\t\t\tbreak;\n\t\t};\n")
if padding ~= "" then
write_line("systracetmp", "#undef _P_\n\n")
end
write_line("systraceret", string.format([[
if (ndx == 0 || ndx == 1)
p = "%s";
break;
]], syscallret))
end
local n_args = #funcargs
if flags & known_flags.SYSMUX ~= 0 then
n_args = 0
end
write_line("systrace", string.format(
"\t\t*n_args = %d;\n\t\tbreak;\n\t}\n", n_args))
write_line("systracetmp", "\t\tbreak;\n")
local nargflags = get_mask({"NOARGS", "NOPROTO", "NODEF"})
if flags & nargflags == 0 then
if #funcargs > 0 then
write_line("sysarg", string.format("struct %s {\n",
argalias))
for _, v in ipairs(funcargs) do
local argname, argtype = v.name, v.type
if argtype == "int" and argname == "_pad" and abi_changes("pair_64bit") then
write_line("sysarg", "#ifdef PAD64_REQUIRED\n")
end
write_line("sysarg", string.format(
"\tchar %s_l_[PADL_(%s)]; %s %s; char %s_r_[PADR_(%s)];\n",
argname, argtype,
argtype, argname,
argname, argtype))
if argtype == "int" and argname == "_pad" and abi_changes("pair_64bit") then
write_line("sysarg", "#endif\n")
end
end
write_line("sysarg", "};\n")
else
write_line("sysarg", string.format(
"struct %s {\n\tsyscallarg_t dummy;\n};\n", argalias))
end
end
local protoflags = get_mask({"NOPROTO", "NODEF"})
if flags & protoflags == 0 then
local sys_prefix = "sys_"
if funcname == "nosys" or funcname == "lkmnosys" or
funcname == "sysarch" or funcname:find("^freebsd") or
funcname:find("^linux") then
sys_prefix = ""
end
write_line("sysdcl", string.format(
"%s\t%s%s(struct thread *, struct %s *);\n",
rettype, sys_prefix, funcname, argalias))
write_line("sysaue", string.format("#define\t%sAUE_%s\t%s\n",
config.syscallprefix, funcalias, auditev))
end
write_line("sysent",
string.format("\t{ .sy_narg = %s, .sy_call = (sy_call_t *)", argssize))
if flags & known_flags.SYSMUX ~= 0 then
write_line("sysent", string.format(
"nosys, .sy_auevent = AUE_NULL, " ..
".sy_flags = %s, .sy_thrcnt = SY_THR_STATIC },",
sysflags))
elseif flags & known_flags.NOSTD ~= 0 then
write_line("sysent", string.format(
"lkmressys, .sy_auevent = AUE_NULL, " ..
".sy_flags = %s, .sy_thrcnt = SY_THR_ABSENT },",
sysflags))
else
if funcname == "nosys" or funcname == "lkmnosys" or
funcname == "sysarch" or funcname:find("^freebsd") or
funcname:find("^linux") then
write_line("sysent", string.format(
"%s, .sy_auevent = %s, .sy_flags = %s, .sy_thrcnt = %s },",
funcname, auditev, sysflags, thr_flag))
else
write_line("sysent", string.format(
"sys_%s, .sy_auevent = %s, .sy_flags = %s, .sy_thrcnt = %s },",
funcname, auditev, sysflags, thr_flag))
end
end
write_line("sysent", string.format("\t/* %d = %s */\n",
sysnum, funcalias))
write_line("sysnames", string.format("\t\"%s\",\t\t\t/* %d = %s */\n",
funcalias, sysnum, funcalias))
if flags & known_flags.NODEF == 0 then
write_line("syshdr", string.format("#define\t%s%s\t%d\n",
config.syscallprefix, funcalias, sysnum))
write_line("sysmk", string.format(" \\\n\t%s.o",
funcalias))
-- yield has never been exposed as a syscall
if funcalias == "yield" then
return
end
if funcalias ~= "exit" and funcalias ~= "vfork" then
write_line("libsysmap", string.format("\t_%s;\n",
funcalias))
end
write_line("libsysmap", string.format("\t__sys_%s;\n",
funcalias))
if flags & known_flags.SYSMUX == 0 then
local argstr_type = ""
local argstr_var = ""
local comma = ""
if #funcargs == 0 then
argstr_type = "void"
argstr_var = "void"
end
for _, v in ipairs(funcargs) do
local argname, argtype = v.name, v.type
argstr_type = argstr_type .. comma .. argtype
argstr_var = argstr_var .. comma .. argtype .. " " .. argname
comma = ", "
-- Accumulate a list of struct types for
-- forward decls. We can't do this in
-- process_args because we don't want compat
-- types in userspace even as no-op.
if isptrtype(argtype) then
local is_struct = false
for word in argtype:gmatch("[^ *]+") do
if is_struct then
structs[word] = word
break
end
if word == "struct" then
is_struct = true
-- next word is the name
end
end
end
end
write_line("libsys_h_type",
string.format("typedef %s (__sys_%s_t)(%s);\n",
syscallret, funcalias, argstr_type))
write_line("libsys_h_func",
string.format("%s __sys_%s(%s);\n",
syscallret, funcalias, argstr_var))
end
end
end
local function handle_obsol(sysnum, funcname, comment)
write_line("sysent",
"\t{ .sy_narg = 0, .sy_call = (sy_call_t *)nosys, " ..
".sy_auevent = AUE_NULL, .sy_flags = 0, .sy_thrcnt = SY_THR_ABSENT },")
write_line("sysent", string.format("\t/* %d = obsolete %s */\n",
sysnum, comment))
write_line("sysnames", string.format(
"\t\"obs_%s\",\t\t\t/* %d = obsolete %s */\n",
funcname, sysnum, comment))
write_line("syshdr", string.format("\t\t\t\t/* %d is obsolete %s */\n",
sysnum, comment))
end
local function handle_compat(sysnum, thr_flag, flags, sysflags, rettype,
auditev, funcname, funcalias, funcargs, argalias)
local argssize, out, outdcl, wrap, prefix, descr
if #funcargs > 0 or flags & known_flags.NODEF ~= 0 then
argssize = "AS(" .. argalias .. ")"
else
argssize = "0"
end
for _, v in pairs(compat_options) do
if flags & v.mask ~= 0 then
if config.mincompat > v.compatlevel then
funcname = strip_abi_prefix(funcname)
funcname = v.prefix .. funcname
return handle_obsol(sysnum, funcname, funcname)