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makesyscalls: add a new SYSMUX type

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This type is for system call multiplexers (syscall(2), __syscall(2))
that don't have a normal handler and instead are handled in the
machine-dependent syscall code.

Reviewed by:	kib, imp
This commit is contained in:
Brooks Davis 2021-11-29 22:03:00 +00:00
parent 5c1835b1d4
commit d7f306c5be
2 changed files with 22 additions and 7 deletions
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6
sys/kern/syscalls.master
View file

@ -13,8 +13,8 @@
; there is no audit event for the call at this time. For the
; case where the event exists, but we don't want auditing, the
; event should be #defined to AUE_NULL in audit_kevents.h.
; type one of STD, OBSOL, RESERVED, UNIMPL, COMPAT, COMPAT4, COMPAT6,
; COMPAT7, COMPAT11, COMPAT12, NODEF, NOARGS, NOPROTO, NOSTD
; type one of STD, OBSOL, RESERVED, UNIMPL, SYSMUX, COMPAT*,
; NODEF, NOARGS, NOPROTO, NOSTD
; The COMPAT* options may be combined with one or more NO*
; options separated by '|' with no spaces (e.g. COMPAT|NOARGS)
; The CAPENABLED option may be ORed into a type.
@ -48,6 +48,8 @@
; function prototype in sys/sysproto.h. Does add a
; definition to syscall.h besides adding a sysent.
; NOTSTATIC syscall is loadable
; 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
;
; To support programmatic generation of both the default ABI and 32-bit compat

23
sys/tools/makesyscalls.lua
View file

@ -196,6 +196,7 @@ local known_flags = {
NOSTD = 0x00000080,
NOTSTATIC = 0x00000100,
CAPENABLED = 0x00000200,
SYSMUX = 0x00000400,
-- Compat flags start from here. We have plenty of space.
}
@ -733,7 +734,9 @@ local function handle_noncompat(sysnum, thr_flag, flags, sysflags, rettype,
auditev, syscallret, funcname, funcalias, funcargs, argalias)
local argssize
if #funcargs > 0 or flags & known_flags["NODEF"] ~= 0 then
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"
@ -752,7 +755,7 @@ local function handle_noncompat(sysnum, thr_flag, flags, sysflags, rettype,
case %d:
]], funcname, sysnum))
if #funcargs > 0 then
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))
@ -820,8 +823,12 @@ local function handle_noncompat(sysnum, thr_flag, flags, sysflags, rettype,
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", #funcargs))
"\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"})
@ -872,7 +879,13 @@ local function handle_noncompat(sysnum, thr_flag, flags, sysflags, rettype,
string.format("\t{ .sy_narg = %s, .sy_call = (sy_call_t *)", argssize))
local column = 8 + 2 + #argssize + 15
if flags & known_flags["NOSTD"] ~= 0 then
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))
column = column + #"nosys" + #"AUE_NULL" + 3
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 },",
@ -1271,7 +1284,7 @@ process_syscall_def = function(line)
local ncompatflags = get_mask({"STD", "NODEF", "NOARGS", "NOPROTO",
"NOSTD"})
local compatflags = get_mask_pat("COMPAT.*")
if noproto then
if noproto or flags & known_flags["SYSMUX"] ~= 0 then
flags = flags | known_flags["NOPROTO"];
end
if flags & known_flags["OBSOL"] ~= 0 then