The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/makesyscalls.sh

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    1 #! /bin/sh -
    2 #       $NetBSD: makesyscalls.sh,v 1.58 2005/02/26 23:32:31 perry Exp $
    3 #
    4 # Copyright (c) 1994, 1996, 2000 Christopher G. Demetriou
    5 # All rights reserved.
    6 #
    7 # Redistribution and use in source and binary forms, with or without
    8 # modification, are permitted provided that the following conditions
    9 # are met:
   10 # 1. Redistributions of source code must retain the above copyright
   11 #    notice, this list of conditions and the following disclaimer.
   12 # 2. Redistributions in binary form must reproduce the above copyright
   13 #    notice, this list of conditions and the following disclaimer in the
   14 #    documentation and/or other materials provided with the distribution.
   15 # 3. All advertising materials mentioning features or use of this software
   16 #    must display the following acknowledgement:
   17 #      This product includes software developed for the NetBSD Project
   18 #      by Christopher G. Demetriou.
   19 # 4. The name of the author may not be used to endorse or promote products
   20 #    derived from this software without specific prior written permission
   21 #
   22 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   23 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   24 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   25 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   26 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   27 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   28 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   29 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   30 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   31 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   32 
   33 #       @(#)makesyscalls.sh     8.1 (Berkeley) 6/10/93
   34 
   35 set -e
   36 
   37 case $# in
   38     2)  ;;
   39     *)  echo "Usage: $0 config-file input-file" 1>&2
   40         exit 1
   41         ;;
   42 esac
   43 
   44 # the config file sets the following variables:
   45 #       sysnames        the syscall names file
   46 #       sysnumhdr       the syscall numbers file
   47 #       syssw           the syscall switch file
   48 #       sysarghdr       the syscall argument struct definitions
   49 #       compatopts      those syscall types that are for 'compat' syscalls
   50 #       switchname      the name for the 'struct sysent' we define
   51 #       namesname       the name for the 'const char *[]' we define
   52 #       constprefix     the prefix for the system call constants
   53 #       registertype    the type for register_t
   54 #       nsysent         the size of the sysent table
   55 #       sys_nosys       [optional] name of function called for unsupported
   56 #                       syscalls, if not sys_nosys()
   57 #
   58 # NOTE THAT THIS makesyscalls.sh DOES NOT SUPPORT 'SYSLIBCOMPAT'.
   59 
   60 # source the config file.
   61 sys_nosys="sys_nosys"   # default is sys_nosys(), if not specified otherwise
   62 . ./$1
   63 
   64 # tmp files:
   65 sysdcl="sysent.dcl"
   66 sysprotos="sys.protos"
   67 syscompat_pref="sysent."
   68 sysent="sysent.switch"
   69 sysnamesbottom="sysnames.bottom"
   70 
   71 trap "rm $sysdcl $sysprotos $sysent $sysnamesbottom" 0
   72 
   73 # Awk program (must support nawk extensions)
   74 # Use "awk" at Berkeley, "nawk" or "gawk" elsewhere.
   75 awk=${AWK:-awk}
   76 
   77 # Does this awk have a "toupper" function?
   78 have_toupper=`$awk 'BEGIN { print toupper("true"); exit; }' 2>/dev/null`
   79 
   80 # If this awk does not define "toupper" then define our own.
   81 if [ "$have_toupper" = TRUE ] ; then
   82         # Used awk (GNU awk or nawk) provides it
   83         toupper=
   84 else
   85         # Provide our own toupper()
   86         toupper='
   87 function toupper(str) {
   88         _toupper_cmd = "echo "str" |tr a-z A-Z"
   89         _toupper_cmd | getline _toupper_str;
   90         close(_toupper_cmd);
   91         return _toupper_str;
   92 }'
   93 fi
   94 
   95 # before handing it off to awk, make a few adjustments:
   96 #       (1) insert spaces around {, }, (, ), *, and commas.
   97 #       (2) get rid of any and all dollar signs (so that rcs id use safe)
   98 #
   99 # The awk script will deal with blank lines and lines that
  100 # start with the comment character (';').
  101 
  102 sed -e '
  103 s/\$//g
  104 :join
  105         /\\$/{a\
  106 
  107         N
  108         s/\\\n//
  109         b join
  110         }
  111 2,${
  112         /^#/!s/\([{}()*,]\)/ \1 /g
  113 }
  114 ' < $2 | $awk "
  115 $toupper
  116 BEGIN {
  117         # to allow nested #if/#else/#endif sets
  118         savedepth = 0
  119         # to track already processed syscalls
  120 
  121         sysnames = \"$sysnames\"
  122         sysprotos = \"$sysprotos\"
  123         sysnumhdr = \"$sysnumhdr\"
  124         sysarghdr = \"$sysarghdr\"
  125         switchname = \"$switchname\"
  126         namesname = \"$namesname\"
  127         constprefix = \"$constprefix\"
  128         registertype = \"$registertype\"
  129         if (!registertype) {
  130             registertype = \"register_t\"
  131         }
  132         nsysent = \"$nsysent\"
  133 
  134         sysdcl = \"$sysdcl\"
  135         syscompat_pref = \"$syscompat_pref\"
  136         sysent = \"$sysent\"
  137         sysnamesbottom = \"$sysnamesbottom\"
  138         sys_nosys = \"$sys_nosys\"
  139         infile = \"$2\"
  140 
  141         compatopts = \"$compatopts\"
  142         "'
  143 
  144         printf "/* \$NetBSD\$ */\n\n" > sysdcl
  145         printf "/*\n * System call switch table.\n *\n" > sysdcl
  146         printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysdcl
  147 
  148         ncompat = split(compatopts,compat)
  149         for (i = 1; i <= ncompat; i++) {
  150                 compat_upper[i] = toupper(compat[i])
  151 
  152                 printf "\n#ifdef %s\n", compat_upper[i] > sysent
  153                 printf "#define %s(func) __CONCAT(%s_,func)\n", compat[i], \
  154                     compat[i] > sysent
  155                 printf "#else\n" > sysent
  156                 printf "#define %s(func) %s\n", compat[i], sys_nosys > sysent
  157                 printf "#endif\n" > sysent
  158         }
  159 
  160         printf "\n#define\ts(type)\tsizeof(type)\n\n" > sysent
  161         printf "struct sysent %s[] = {\n",switchname > sysent
  162 
  163         printf "/* \$NetBSD\$ */\n\n" > sysnames
  164         printf "/*\n * System call names.\n *\n" > sysnames
  165         printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysnames
  166 
  167         printf "\n/*\n * System call prototypes.\n */\n\n" > sysprotos
  168 
  169         printf "/* \$NetBSD\$ */\n\n" > sysnumhdr
  170         printf "/*\n * System call numbers.\n *\n" > sysnumhdr
  171         printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysnumhdr
  172 
  173         printf "/* \$NetBSD\$ */\n\n" > sysarghdr
  174         printf "/*\n * System call argument lists.\n *\n" > sysarghdr
  175         printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysarghdr
  176 }
  177 NR == 1 {
  178         sub(/ $/, "")
  179         printf " * created from%s\n */\n\n", $0 > sysdcl
  180         printf "#include <sys/cdefs.h>\n__KERNEL_RCSID(0, \"\$NetBSD\$\");\n\n" > sysdcl
  181 
  182         printf " * created from%s\n */\n\n", $0 > sysnames
  183         printf "#include <sys/cdefs.h>\n__KERNEL_RCSID(0, \"\$NetBSD\$\");\n\n" > sysnames
  184 
  185         # System call names are included by userland (kdump(1)), so
  186         # hide the include files from it.
  187         printf "#if defined(_KERNEL_OPT)\n" > sysnames
  188 
  189         printf "#endif /* _KERNEL_OPT */\n\n" > sysnamesbottom
  190         printf "const char *const %s[] = {\n",namesname > sysnamesbottom
  191 
  192         printf " * created from%s\n */\n\n", $0 > sysnumhdr
  193 
  194         printf " * created from%s\n */\n\n", $0 > sysarghdr
  195         printf "#ifndef _" constprefix "_SYSCALLARGS_H_\n" > sysarghdr
  196         printf "#define _" constprefix "_SYSCALLARGS_H_\n\n" > sysarghdr
  197         printf "#ifdef\tsyscallarg\n" > sysarghdr
  198         printf "#undef\tsyscallarg\n" > sysarghdr
  199         printf "#endif\n\n" > sysarghdr
  200         printf "#define\tsyscallarg(x)\t\t\t\t\t\t\t\\\n" > sysarghdr
  201         printf "\tunion {\t\t\t\t\t\t\t\t\\\n" > sysarghdr
  202         printf "\t\t%s pad;\t\t\t\t\t\t\\\n", registertype > sysarghdr
  203         printf "\t\tstruct { x datum; } le;\t\t\t\t\t\\\n" > sysarghdr
  204         printf "\t\tstruct { /* LINTED zero array dimension */\t\t\\\n" \
  205                 > sysarghdr
  206         printf "\t\t\tint8_t pad[  /* CONSTCOND */\t\t\t\\\n" > sysarghdr
  207         printf "\t\t\t\t(sizeof (%s) < sizeof (x))\t\\\n", \
  208                 registertype > sysarghdr
  209         printf "\t\t\t\t? 0\t\t\t\t\t\\\n" > sysarghdr
  210         printf "\t\t\t\t: sizeof (%s) - sizeof (x)];\t\\\n", \
  211                 registertype > sysarghdr
  212         printf "\t\t\tx datum;\t\t\t\t\t\\\n" > sysarghdr
  213         printf "\t\t} be;\t\t\t\t\t\t\t\\\n" > sysarghdr
  214         printf "\t}\n" > sysarghdr
  215         next
  216 }
  217 NF == 0 || $1 ~ /^;/ {
  218         next
  219 }
  220 $0 ~ /^%%$/ {
  221         intable = 1
  222         next
  223 }
  224 $1 ~ /^#[       ]*include/ {
  225         print > sysdcl
  226         print > sysnames
  227         next
  228 }
  229 $1 ~ /^#/ && !intable {
  230         print > sysdcl
  231         print > sysnames
  232         next
  233 }
  234 $1 ~ /^#/ && intable {
  235         if ($1 ~ /^#[   ]*if/) {
  236                 savedepth++
  237                 savesyscall[savedepth] = syscall
  238         }
  239         if ($1 ~ /^#[   ]*else/) {
  240                 if (savedepth <= 0) {
  241                         printf("%s: line %d: unbalanced #else\n", \
  242                             infile, NR)
  243                         exit 1
  244                 }
  245                 syscall = savesyscall[savedepth]
  246         }
  247         if ($1 ~ /^#[       ]*endif/) {
  248                 if (savedepth <= 0) {
  249                         printf("%s: line %d: unbalanced #endif\n", \
  250                             infile, NR)
  251                         exit 1
  252                 }
  253                 savedepth--
  254         }
  255         print > sysent
  256         print > sysarghdr
  257         print > sysnumhdr
  258         print > sysprotos
  259         print > sysnamesbottom
  260         next
  261 }
  262 syscall != $1 {
  263         printf "%s: line %d: syscall number out of sync at %d\n", \
  264            infile, NR, syscall
  265         printf "line is:\n"
  266         print
  267         exit 1
  268 }
  269 function parserr(was, wanted) {
  270         printf "%s: line %d: unexpected %s (expected %s)\n", \
  271             infile, NR, was, wanted
  272         printf "line is:\n"
  273         print
  274         exit 1
  275 }
  276 function parseline() {
  277         f=3                     # toss number and type
  278         sycall_flags="0"
  279         if ($NF != "}") {
  280                 funcalias=$NF
  281                 end=NF-1
  282         } else {
  283                 funcalias=""
  284                 end=NF
  285         }
  286         if ($f == "MPSAFE") {           # allow for MP-safe syscalls
  287                 sycall_flags = sprintf("SYCALL_MPSAFE | %s", sycall_flags)
  288                 f++
  289         }
  290         if ($f ~ /^[a-z0-9_]*$/) {      # allow syscall alias
  291                 funcalias=$f
  292                 f++
  293         }
  294         if ($f != "{")
  295                 parserr($f, "{")
  296         f++
  297         if ($end != "}")
  298                 parserr($end, "}")
  299         end--
  300         if ($end != ";")
  301                 parserr($end, ";")
  302         end--
  303         if ($end != ")")
  304                 parserr($end, ")")
  305         end--
  306 
  307         returntype = oldf = "";
  308         do {
  309                 if (returntype != "" && oldf != "*")
  310                         returntype = returntype" ";
  311                 returntype = returntype$f;
  312                 oldf = $f;
  313                 f++
  314         } while (f < (end - 1) && $(f+1) != "(");
  315         if (f == (end - 1)) {
  316                 parserr($f, "function argument definition (maybe \"(\"?)");
  317         }
  318 
  319         funcname=$f
  320         if (funcalias == "") {
  321                 funcalias=funcname
  322                 sub(/^([^_]+_)*sys_/, "", funcalias)
  323         }
  324         f++
  325 
  326         if ($f != "(")
  327                 parserr($f, ")")
  328         f++
  329 
  330         argc=0;
  331         if (f == end) {
  332                 if ($f != "void")
  333                         parserr($f, "argument definition")
  334                 isvarargs = 0;
  335                 varargc = 0;
  336                 return
  337         }
  338 
  339         # some system calls (open() and fcntl()) can accept a variable
  340         # number of arguments.  If syscalls accept a variable number of
  341         # arguments, they must still have arguments specified for
  342         # the remaining argument "positions," because of the way the
  343         # kernel system call argument handling works.
  344         #
  345         # Indirect system calls, e.g. syscall(), are exceptions to this
  346         # rule, since they are handled entirely by machine-dependent code
  347         # and do not need argument structures built.
  348 
  349         isvarargs = 0;
  350         while (f <= end) {
  351                 if ($f == "...") {
  352                         f++;
  353                         isvarargs = 1;
  354                         varargc = argc;
  355                         continue;
  356                 }
  357                 argc++
  358                 argtype[argc]=""
  359                 oldf=""
  360                 while (f < end && $(f+1) != ",") {
  361                         if (argtype[argc] != "" && oldf != "*")
  362                                 argtype[argc] = argtype[argc]" ";
  363                         argtype[argc] = argtype[argc]$f;
  364                         oldf = $f;
  365                         f++
  366                 }
  367                 if (argtype[argc] == "")
  368                         parserr($f, "argument definition")
  369                 argname[argc]=$f;
  370                 f += 2;                 # skip name, and any comma
  371         }
  372         # must see another argument after varargs notice.
  373         if (isvarargs) {
  374                 if (argc == varargc && $2 != "INDIR")
  375                         parserr($f, "argument definition")
  376         } else
  377                 varargc = argc;
  378 }
  379 
  380 function printproto(wrap) {
  381         printf("/* syscall: \"%s%s\" ret: \"%s\" args:", wrap, funcalias,
  382             returntype) > sysnumhdr
  383         for (i = 1; i <= varargc; i++)
  384                 printf(" \"%s\"", argtype[i]) > sysnumhdr
  385         if (isvarargs)
  386                 printf(" \"...\"") > sysnumhdr
  387         printf(" */\n") > sysnumhdr
  388         printf("#define\t%s%s%s\t%d\n\n", constprefix, wrap, funcalias,
  389             syscall) > sysnumhdr
  390 }
  391 
  392 function putent(nodefs, compatwrap) {
  393         # output syscall declaration for switch table.  INDIR functions
  394         # get none, since they always have sys_nosys() for their table
  395         # entries.
  396         if (nodefs != "INDIR") {
  397                 prototype = "(struct lwp *, void *, register_t *)"
  398                 if (compatwrap == "")
  399                         proto = sprintf("int\t%s%s;\n", funcname, prototype);
  400                 else
  401                         proto = sprintf("int\t%s_%s%s;\n", compatwrap,
  402                             funcname, prototype);
  403                 if (sysmap[proto] != 1) {
  404                         sysmap[proto] = 1;
  405                         print proto > sysprotos;
  406                 }
  407         }
  408 
  409         # output syscall switch entry
  410         if (nodefs == "INDIR") {
  411                 printf("\t{ 0, 0, %s,\n\t    %s },\t\t\t/* %d = %s (indir) */\n", \
  412                     sycall_flags, sys_nosys, syscall, funcalias) > sysent
  413         } else {
  414 #               printf("\t{ { %d", argc) > sysent
  415 #               for (i = 1; i <= argc; i++) {
  416 #                       if (i == 5)             # wrap the line
  417 #                               printf(",\n\t    ") > sysent
  418 #                       else
  419 #                               printf(", ") > sysent
  420 #                       printf("s(%s)", argtypenospc[i]) > sysent
  421 #               }
  422                 printf("\t{ %d, ", argc) > sysent
  423                 if (argc == 0)
  424                         printf("0") > sysent
  425                 else if (compatwrap == "")
  426                         printf("s(struct %s_args)", funcname) > sysent
  427                 else
  428                         printf("s(struct %s_%s_args)", compatwrap,
  429                             funcname) > sysent
  430                 if (compatwrap == "")
  431                         wfn = sprintf("%s", funcname);
  432                 else
  433                         wfn = sprintf("%s(%s)", compatwrap, funcname);
  434                 printf(", %s,\n\t    %s },", sycall_flags, wfn) > sysent
  435                 for (i = 0; i < (33 - length(wfn)) / 8; i++)
  436                         printf("\t") > sysent
  437                 if (compatwrap == "")
  438                         printf("/* %d = %s */\n", syscall, funcalias) > sysent
  439                 else
  440                         printf("/* %d = %s %s */\n", syscall, compatwrap,
  441                             funcalias) > sysent
  442         }
  443 
  444         # output syscall name for names table
  445         if (compatwrap == "")
  446                 printf("\t\"%s\",\t\t\t/* %d = %s */\n", funcalias, syscall,
  447                     funcalias) > sysnamesbottom
  448         else
  449                 printf("\t\"%s_%s\",\t/* %d = %s %s */\n", compatwrap,
  450                     funcalias, syscall, compatwrap, funcalias) > sysnamesbottom
  451 
  452         # output syscall number of header, if appropriate
  453         if (nodefs == "" || nodefs == "NOARGS" || nodefs == "INDIR") {
  454                 # output a prototype, to be used to generate lint stubs in
  455                 # libc.
  456                 printproto("")
  457 
  458         } else if (nodefs == "COMPAT") {
  459                 # Just define the syscall number with a comment.  These
  460                 # may be used by compatibility stubs in libc.
  461                 printproto(compatwrap "_")
  462         } else if (nodefs != "NODEF")
  463                 printf("\t\t\t\t/* %d is %s %s */\n\n", syscall,
  464                     compatwrap, funcalias) > sysnumhdr
  465 
  466         # output syscall argument structure, if it has arguments
  467         if (argc != 0 && nodefs != "NOARGS" && nodefs != "INDIR") {
  468                 if (compatwrap == "")
  469                         printf("\nstruct %s_args {\n", funcname) > sysarghdr
  470                 else
  471                         printf("\nstruct %s_%s_args {\n", compatwrap,
  472                             funcname) > sysarghdr
  473                 for (i = 1; i <= argc; i++)
  474                         printf("\tsyscallarg(%s) %s;\n", argtype[i],
  475                             argname[i]) > sysarghdr
  476                 printf("};\n") > sysarghdr
  477         }
  478 }
  479 $2 == "STD" {
  480         parseline()
  481         putent("", "");
  482         syscall++
  483         next
  484 }
  485 $2 == "NODEF" || $2 == "NOARGS" || $2 == "INDIR" {
  486         parseline()
  487         putent($2, "")
  488         syscall++
  489         next
  490 }
  491 $2 == "OBSOL" || $2 == "UNIMPL" || $2 == "EXCL" {
  492         if ($2 == "OBSOL")
  493                 comment="obsolete"
  494         else if ($2 == "EXCL")
  495                 comment="excluded"
  496         else
  497                 comment="unimplemented"
  498         for (i = 3; i <= NF; i++)
  499                 comment=comment " " $i
  500 
  501         printf("\t{ 0, 0, 0,\n\t    %s },\t\t\t/* %d = %s */\n", \
  502             sys_nosys, syscall, comment) > sysent
  503         printf("\t\"#%d (%s)\",\t\t/* %d = %s */\n", \
  504             syscall, comment, syscall, comment) > sysnamesbottom
  505         if ($2 != "UNIMPL")
  506                 printf("\t\t\t\t/* %d is %s */\n", syscall, comment) > sysnumhdr
  507         syscall++
  508         next
  509 }
  510 {
  511         for (i = 1; i <= ncompat; i++) {
  512                 if ($2 == compat_upper[i]) {
  513                         parseline();
  514                         putent("COMPAT", compat[i])
  515                         syscall++
  516                         next
  517                 }
  518         }
  519         printf("%s: line %d: unrecognized keyword %s\n", infile, NR, $2)
  520         exit 1
  521 }
  522 END {
  523         maxsyscall = syscall
  524         if (nsysent) {
  525                 if (syscall > nsysent) {
  526                         printf("%s: line %d: too many syscalls [%d > %d]\n", infile, NR, syscall, nsysent)
  527                         exit 1
  528                 }
  529                 while (syscall < nsysent) {
  530                         printf("\t{ 0, 0, 0,\n\t    %s },\t\t\t/* %d = filler */\n", \
  531                             sys_nosys, syscall) > sysent
  532                         syscall++
  533                 }
  534         }
  535         printf("};\n\n") > sysent
  536         printf("};\n") > sysnamesbottom
  537         printf("#define\t%sMAXSYSCALL\t%d\n", constprefix, maxsyscall) > sysnumhdr
  538         if (nsysent)
  539                 printf("#define\t%sNSYSENT\t%d\n", constprefix, nsysent) > sysnumhdr
  540 } '
  541 
  542 cat $sysprotos >> $sysarghdr
  543 echo "#endif /* _${constprefix}_SYSCALLARGS_H_ */" >> $sysarghdr
  544 cat $sysdcl $sysent > $syssw
  545 cat $sysnamesbottom >> $sysnames
  546 
  547 #chmod 444 $sysnames $sysnumhdr $syssw

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