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src/sys/kern/makesyscalls.sh

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#! /bin/sh -
# $OpenBSD: makesyscalls.sh,v 1.22 2024/01/07 20:52:44 miod Exp $
# $NetBSD: makesyscalls.sh,v 1.26 1998/01/09 06:17:51 thorpej Exp $
#
# Copyright (c) 1994,1996 Christopher G. Demetriou
# All rights reserved.
#
# 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.
# 3. All advertising materials mentioning features or use of this software
# must display the following acknowledgement:
# This product includes software developed for the NetBSD Project
# by Christopher G. Demetriou.
# 4. The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
# @(#)makesyscalls.sh 8.1 (Berkeley) 6/10/93
set -e
case $# in
1) ;;
*) echo "Usage: $0 input-file" 1>&2
exit 1
;;
esac
sysnames="syscalls.c"
sysnumhdr="../sys/syscall.h"
syssw="init_sysent.c"
sysarghdr="../sys/syscallargs.h"
# Any additions to the next line for options that are required for the
# (new) kernel to boot an existing userland must be coordinated with
# the snapshot builders
compatopts=""
switchname="sysent"
namesname="syscallnames"
constprefix="SYS_"
# this script sets the following variables:
# sysnames the syscall names file
# sysnumhdr the syscall numbers file
# syssw the syscall switch file
# sysarghdr the syscall argument struct definitions
# compatopts those syscall types that are for 'compat' syscalls
# switchname the name for the 'const struct sysent' we define
# namesname the name for the 'const char *const[]' we define
# constprefix the prefix for the system call constants
#
# NOTE THAT THIS makesyscalls.sh DOES NOT SUPPORT 'LIBCOMPAT'.
# tmp files:
sysdcl="sysent.dcl"
sysprotos="sys.protos"
syscompat_pref="sysent."
sysent="sysent.switch"
trap "rm $sysdcl $sysprotos $sysent" 0
# before handing it off to awk, make a few adjustments:
# (1) insert spaces around {, }, (, ), *, and commas.
# (2) get rid of any and all dollar signs (so that rcs id use safe)
#
# The awk script will deal with blank lines and lines that
# start with the comment character (';').
sed -e '
s/\$//g
:join
/\\$/{a\
N
s/\\\n//
b join
}
2,${
/^#/!s/\([{}()*,]\)/ \1 /g
}
' < $1 | awk "
BEGIN {
# to allow nested #if/#else/#endif sets
savedepth = 0
sysnames = \"$sysnames\"
sysprotos = \"$sysprotos\"
sysnumhdr = \"$sysnumhdr\"
sysarghdr = \"$sysarghdr\"
switchname = \"$switchname\"
namesname = \"$namesname\"
constprefix = \"$constprefix\"
sysdcl = \"$sysdcl\"
syscompat_pref = \"$syscompat_pref\"
sysent = \"$sysent\"
infile = \"$1\"
compatopts = \"$compatopts\"
"'
printf "/*\t\$OpenBSD\$\t*/\n\n" > sysdcl
printf "/*\n * System call switch table.\n *\n" > sysdcl
printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysdcl
ncompat = split(compatopts,compat)
for (i = 1; i <= ncompat; i++) {
compat_upper[i] = toupper(compat[i])
printf "\n#ifdef %s\n", compat_upper[i] > sysent
printf "#define %s(func) __CONCAT(%s_,func)\n", compat[i], \
compat[i] > sysent
printf "#else\n" > sysent
printf "#define %s(func) sys_nosys\n", compat[i] > sysent
printf "#endif\n" > sysent
}
printf "\n#define\ts(type)\tsizeof(type)\n\n" > sysent
printf "const struct sysent %s[] = {\n",switchname > sysent
printf "/*\t\$OpenBSD\$\t*/\n\n" > sysnames
printf "/*\n * System call names.\n *\n" > sysnames
printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysnames
printf "\n/*\n * System call prototypes.\n */\n\n" > sysprotos
printf "/*\t\$OpenBSD\$\t*/\n\n" > sysnumhdr
printf "/*\n * System call numbers.\n *\n" > sysnumhdr
printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysnumhdr
printf "/*\t\$OpenBSD\$\t*/\n\n" > sysarghdr
printf "/*\n * System call argument lists.\n *\n" > sysarghdr
printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysarghdr
}
NR == 1 {
printf " * created from%s\n */\n\n", $0 > sysdcl
printf " * created from%s\n */\n\n", $0 > sysnames
printf "const char *const %s[] = {\n",namesname > sysnames
printf " * created from%s\n */\n\n", $0 > sysnumhdr
printf " * created from%s\n */\n\n", $0 > sysarghdr
printf "#ifdef\tsyscallarg\n" > sysarghdr
printf "#undef\tsyscallarg\n" > sysarghdr
printf "#endif\n\n" > sysarghdr
printf "#define\tsyscallarg(x)\t\t\t\t\t\t\t\\\n" > sysarghdr
printf "\tunion {\t\t\t\t\t\t\t\t\\\n" > sysarghdr
printf "\t\tregister_t pad;\t\t\t\t\t\t\\\n" > sysarghdr
printf "\t\tstruct { x datum; } le;\t\t\t\t\t\\\n" > sysarghdr
printf "\t\tstruct {\t\t\t\t\t\t\\\n" > sysarghdr
printf "\t\t\tint8_t pad[ (sizeof (register_t) < sizeof (x))\t\\\n" \
> sysarghdr
printf "\t\t\t\t? 0\t\t\t\t\t\\\n" > sysarghdr
printf "\t\t\t\t: sizeof (register_t) - sizeof (x)];\t\\\n" \
> sysarghdr
printf "\t\t\tx datum;\t\t\t\t\t\\\n" > sysarghdr
printf "\t\t} be;\t\t\t\t\t\t\t\\\n" > sysarghdr
printf "\t}\n" > sysarghdr
next
}
NF == 0 || $1 ~ /^;/ {
next
}
$1 ~ /^#[ ]*include/ {
print > sysdcl
next
}
$1 ~ /^#[ ]*if/ {
print > sysent
print > sysprotos
print > sysnames
savesyscall[++savedepth] = syscall
next
}
$1 ~ /^#[ ]*else/ {
print > sysent
print > sysprotos
print > sysnames
if (savedepth <= 0) {
printf "%s: line %d: unbalanced #else\n", \
infile, NR
exit 1
}
syscall = savesyscall[savedepth]
next
}
$1 ~ /^#/ {
if ($1 ~ /^#[ ]*endif/) {
if (savedepth <= 0) {
printf "%s: line %d: unbalanced #endif\n", \
infile, NR
exit 1
}
savedepth--;
}
print > sysent
print > sysprotos
print > sysnames
next
}
syscall != $1 {
printf "%s: line %d: syscall number out of sync at %d\n", \
infile, NR, syscall
printf "line is:\n"
print
exit 1
}
function parserr(was, wanted) {
printf "%s: line %d: unexpected %s (expected %s)\n", \
infile, NR, was, wanted
exit 1
}
function parseline() {
f=3 # toss number and type
sycall_flags="0"
if ($NF != "}") {
funcalias=$NF
end=NF-1
} else {
funcalias=""
end=NF
}
if ($f == "NOLOCK") { # syscall does not need locks
sycall_flags = sprintf("SY_NOLOCK | %s", sycall_flags)
f++
}
if ($f ~ /^[a-z0-9_]*$/) { # allow syscall alias
funcalias=$f
f++
}
if ($f != "{")
parserr($f, "{")
f++
if ($end != "}")
parserr($end, "}")
end--
if ($end != ";")
parserr($end, ";")
end--
if ($end != ")")
parserr($end, ")")
end--
returntype = oldf = "";
do {
if (returntype != "" && oldf != "*")
returntype = returntype" ";
returntype = returntype$f;
oldf = $f;
f++
} while (f < (end - 1) && $(f+1) != "(");
if (f == (end - 1)) {
parserr($f, "function argument definition (maybe \"(\"?)");
}
funcname=$f
if (funcalias == "") {
funcalias=funcname
sub(/^([^_]+_)*sys_/, "", funcalias)
}
f++
if ($f != "(")
parserr($f, ")")
f++
argc=0;
if (f == end) {
if ($f != "void")
parserr($f, "argument definition")
isvarargs = 0;
varargc = 0;
return
}
# some system calls (open() and fcntl()) can accept a variable
# number of arguments. If syscalls accept a variable number of
# arguments, they must still have arguments specified for
# the remaining argument "positions," because of the way the
# kernel system call argument handling works.
isvarargs = 0;
while (f <= end) {
if ($f == "...") {
f++;
isvarargs = 1;
varargc = argc;
continue;
}
argc++
argtype[argc]=""
oldf=""
while (f < end && $(f+1) != ",") {
if (argtype[argc] != "" && oldf != "*")
argtype[argc] = argtype[argc]" ";
argtype[argc] = argtype[argc]$f;
oldf = $f;
f++
}
if (argtype[argc] == "")
parserr($f, "argument definition")
argname[argc]=$f;
f += 2; # skip name, and any comma
}
# must see another argument after varargs notice.
if (isvarargs) {
if (argc == varargc)
parserr($f, "argument definition")
} else
varargc = argc;
if (argc > 6) {
printf "%s: line %d: too many syscall arguments (%d > 6)\n", \
infile, NR, argc
exit 1
}
}
function putent(nodefs, compatwrap) {
# output syscall declaration for switch table.
prototype = "(struct proc *, void *, register_t *)"
if (compatwrap == "")
printf("int\t%s%s;\n", funcname,
prototype) > sysprotos
else
printf("int\t%s_%s%s;\n", compatwrap, funcname,
prototype) > sysprotos
# output syscall switch entry
# printf("\t{ { %d", argc) > sysent
# for (i = 1; i <= argc; i++) {
# if (i == 5) # wrap the line
# printf(",\n\t ") > sysent
# else
# printf(", ") > sysent
# printf("s(%s)", argtypenospc[i]) > sysent
# }
printf("\t{ %d, ", argc) > sysent
if (argc == 0)
printf("0") > sysent
else if (compatwrap == "")
printf("s(struct %s_args)", funcname) > sysent
else
printf("s(struct %s_%s_args)", compatwrap,
funcname) > sysent
if (compatwrap == "")
wfn = sprintf("%s", funcname);
else
wfn = sprintf("%s(%s)", compatwrap, funcname);
printf(", %s,\n\t %s },", sycall_flags, wfn) > sysent
for (i = 0; i < (33 - length(wfn)) / 8; i++)
printf("\t") > sysent
if (compatwrap == "")
printf("/* %d = %s */\n", syscall, funcalias) > sysent
else
printf("/* %d = %s %s */\n", syscall, compatwrap,
funcalias) > sysent
# output syscall name for names table
if (compatwrap == "")
printf("\t\"%s\",\t\t\t/* %d = %s */\n", funcalias, syscall,
funcalias) > sysnames
else
printf("\t\"%s_%s\",\t/* %d = %s %s */\n", compatwrap,
funcalias, syscall, compatwrap, funcalias) > sysnames
# output syscall number of header, if appropriate
if (nodefs == "" || nodefs == "NOARGS") {
# output a prototype, to be used to generate lint stubs in
# libc.
printf("/* syscall: \"%s\" ret: \"%s\" args:", funcalias,
returntype) > sysnumhdr
for (i = 1; i <= varargc; i++)
printf(" \"%s\"", argtype[i]) > sysnumhdr
if (isvarargs) {
printf(" \"...\"") > sysnumhdr
for (i = varargc + 1; i <= argc; i++)
printf(" \"%s\"", argtype[i]) > sysnumhdr
}
printf(" */\n") > sysnumhdr
printf("#define\t%s%s\t%d\n\n", constprefix, funcalias,
syscall) > sysnumhdr
} else if (nodefs != "NODEF")
printf("\t\t\t\t/* %d is %s %s */\n\n", syscall,
compatwrap, funcalias) > sysnumhdr
# output syscall argument structure, if it has arguments
if (argc != 0 && nodefs != "NOARGS") {
if (compatwrap == "")
printf("\nstruct %s_args {\n", funcname) > sysarghdr
else
printf("\nstruct %s_%s_args {\n", compatwrap,
funcname) > sysarghdr
for (i = 1; i <= argc; i++)
printf("\tsyscallarg(%s) %s;\n", argtype[i],
argname[i]) > sysarghdr
printf("};\n") > sysarghdr
}
}
$2 == "STD" {
parseline()
putent("", "");
syscall++
next
}
$2 == "NODEF" || $2 == "NOARGS" {
parseline()
putent($2, "")
syscall++
next
}
$2 == "OBSOL" || $2 == "UNIMPL" {
if ($2 == "OBSOL")
comment="obsolete"
else
comment="unimplemented"
for (i = 3; i <= NF; i++)
comment=comment " " $i
printf("\t{ 0, 0, 0,\n\t sys_nosys },\t\t\t/* %d = %s */\n", \
syscall, comment) > sysent
printf("\t\"#%d (%s)\",\t\t/* %d = %s */\n", \
syscall, comment, syscall, comment) > sysnames
if ($2 != "UNIMPL")
printf("\t\t\t\t/* %d is %s */\n", syscall, comment) > sysnumhdr
syscall++
next
}
{
for (i = 1; i <= ncompat; i++) {
if ($2 == compat_upper[i]) {
parseline();
putent("COMMENT", compat[i])
syscall++
next
}
}
printf "%s: line %d: unrecognized keyword %s\n", infile, NR, $2
exit 1
}
END {
printf("};\n\n") > sysent
printf("};\n") > sysnames
printf("#define\t%sMAXSYSCALL\t%d\n", constprefix, syscall) > sysnumhdr
} '
cat $sysprotos >> $sysarghdr
cat $sysdcl $sysent > $syssw
#chmod 444 $sysnames $sysnumhdr $syssw
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