1
0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-24 11:29:10 +00:00
freebsd/sys/kern/makesyscalls.sh
Peter Wemm d66a506616 Mega-commit for Linux emulator update.. This has been stress tested under
netscape-2.0 for Linux running all the Java stuff.  The scrollbars are now
working, at least on my machine. (whew! :-)

I'm uncomfortable with the size of this commit, but it's too
inter-dependant to easily seperate out.

The main changes:

COMPAT_LINUX is *GONE*.  Most of the code has been moved out of the i386
machine dependent section into the linux emulator itself.  The int 0x80
syscall code was almost identical to the lcall 7,0 code and a minor tweak
allows them to both be used with the same C code.  All kernels can now
just modload the lkm and it'll DTRT without having to rebuild the kernel
first.  Like IBCS2, you can statically compile it in with "options LINUX".

A pile of new syscalls implemented, including getdents(), llseek(),
readv(), writev(), msync(), personality().  The Linux-ELF libraries want
to use some of these.

linux_select() now obeys Linux semantics, ie: returns the time remaining
of the timeout value rather than leaving it the original value.

Quite a few bugs removed, including incorrect arguments being used in
syscalls..  eg:  mixups between passing the sigset as an int, vs passing
it as a pointer and doing a copyin(), missing return values, unhandled
cases, SIOC* ioctls, etc.

The build for the code has changed.  i386/conf/files now knows how
to build linux_genassym and generate linux_assym.h on the fly.

Supporting changes elsewhere in the kernel:

The user-mode signal trampoline has moved from the U area to immediately
below the top of the stack (below PS_STRINGS).  This allows the different
binary emulations to have their own signal trampoline code (which gets rid
of the hardwired syscall 103 (sigreturn on BSD, syslog on Linux)) and so
that the emulator can provide the exact "struct sigcontext *" argument to
the program's signal handlers.

The sigstack's "ss_flags" now uses SS_DISABLE and SS_ONSTACK flags, which
have the same values as the re-used SA_DISABLE and SA_ONSTACK which are
intended for sigaction only.  This enables the support of a SA_RESETHAND
flag to sigaction to implement the gross SYSV and Linux SA_ONESHOT signal
semantics where the signal handler is reset when it's triggered.

makesyscalls.sh no longer appends the struct sysentvec on the end of the
generated init_sysent.c code.  It's a lot saner to have it in a seperate
file rather than trying to update the structure inside the awk script. :-)

At exec time, the dozen bytes or so of signal trampoline code are copied
to the top of the user's stack, rather than obtaining the trampoline code
the old way by getting a clone of the parent's user area.  This allows
Linux and native binaries to freely exec each other without getting
trampolines mixed up.
1996-03-02 19:38:20 +00:00

362 lines
8.9 KiB
Bash

#! /bin/sh -
# @(#)makesyscalls.sh 8.1 (Berkeley) 6/10/93
# $Id: makesyscalls.sh,v 1.16 1995/10/07 23:56:18 swallace Exp $
set -e
# name of compat option:
compat=COMPAT_43
# output files:
sysnames="syscalls.c"
sysproto="../sys/sysproto.h"
sysproto_h=_SYS_SYSPROTO_H_
syshdr="../sys/syscall.h"
syssw="init_sysent.c"
syshide="../sys/syscall-hide.h"
syscallprefix="SYS_"
switchname="sysent"
namesname="syscallnames"
# tmp files:
sysdcl="sysent.dcl"
syscompat="sysent.compat"
syscompatdcl="sysent.compatdcl"
sysent="sysent.switch"
sysinc="sysinc.switch"
sysarg="sysarg.switch"
trap "rm $sysdcl $syscompat $syscompatdcl $sysent $sysinc $sysarg" 0
case $# in
0) echo "Usage: $0 input-file <config-file>" 1>&2
exit 1
;;
esac
if [ -f $2 ]; then
. $2
fi
sed -e '
s/\$//g
:join
/\\$/{a\
N
s/\\\n//
b join
}
2,${
/^#/!s/\([{}()*,]\)/ \1 /g
}
' < $1 | awk "
BEGIN {
sysdcl = \"$sysdcl\"
sysproto = \"$sysproto\"
sysproto_h = \"$sysproto_h\"
syscompat = \"$syscompat\"
syscompatdcl = \"$syscompatdcl\"
sysent = \"$sysent\"
sysinc = \"$sysinc\"
sysarg = \"$sysarg\"
sysnames = \"$sysnames\"
syshdr = \"$syshdr\"
compat = \"$compat\"
syshide = \"$syshide\"
syscallprefix = \"$syscallprefix\"
switchname = \"$switchname\"
namesname = \"$namesname\"
infile = \"$1\"
"'
printf "/*\n * System call switch table.\n *\n" > sysinc
printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysinc
printf "/*\n * System call prototypes.\n *\n" > sysarg
printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysarg
printf "\n#ifdef %s\n\n", compat > syscompat
printf "/*\n * System call names.\n *\n" > sysnames
printf " * DO NOT EDIT-- this file is automatically generated.\n" > sysnames
printf "/*\n * System call numbers.\n *\n" > syshdr
printf " * DO NOT EDIT-- this file is automatically generated.\n" > syshdr
printf "/*\n * System call hiders.\n *\n" > syshide
printf " * DO NOT EDIT-- this file is automatically generated.\n" > syshide
}
NR == 1 {
gsub("[$]Id: ", "", $0)
gsub(" [$]", "", $0)
printf " * created from%s\n */\n\n", $0 > sysinc
printf "\n#ifdef %s\n", compat > sysent
printf "#define compat(n, name) n, (sy_call_t *)__CONCAT(o,name)\n" > sysent
printf("#else\n") > sysent
printf("#define compat(n, name) 0, (sy_call_t *)nosys\n") > sysent
printf("#endif\n\n") > sysent
printf("/* The casts are bogus but will do for now. */\n") > sysent
printf "struct sysent %s[] = {\n",switchname > sysent
printf " * created from%s\n */\n\n", $0 > sysarg
printf("#ifndef %s\n", sysproto_h) > sysarg
printf("#define\t%s\n\n", sysproto_h) > sysarg
printf "#include <sys/types.h>\n", $0 > sysarg
printf "#include <sys/param.h>\n", $0 > sysarg
printf "#include <sys/mount.h>\n\n", $0 > sysarg
printf " * created from%s\n */\n\n", $0 > sysnames
printf "char *%s[] = {\n", namesname > sysnames
printf " * created from%s\n */\n\n", $0 > syshdr
printf " * created from%s\n */\n\n", $0 > syshide
next
}
NF == 0 || $1 ~ /^;/ {
next
}
$1 ~ /^#[ ]*include/ {
print > sysinc
next
}
$1 ~ /^#[ ]*if/ {
print > sysent
print > sysdcl
print > sysarg
print > syscompat
print > sysnames
print > syshide
savesyscall = syscall
next
}
$1 ~ /^#[ ]*else/ {
print > sysent
print > sysdcl
print > sysarg
print > syscompat
print > sysnames
print > syshide
syscall = savesyscall
next
}
$1 ~ /^#/ {
print > sysent
print > sysdcl
print > sysarg
print > syscompat
print > sysnames
print > syshide
next
}
syscall != $1 {
printf "%s: line %d: syscall number out of sync at %d\n", \
infile, NR, syscall
printf "line is:\n"
print
exit 1
}
function parserr(was, wanted) {
printf "%s: line %d: unexpected %s (expected %s)\n", \
infile, NR, was, wanted
exit 1
}
function parseline() {
f=4 # toss number and type
argc= 0;
bigargc = 0;
if ($NF != "}") {
funcalias=$(NF-2)
argalias=$(NF-1)
rettype=$NF
end=NF-3
} else {
funcalias=""
argalias=""
rettype="int"
end=NF
}
if ($2 == "NODEF") {
funcname=$4
return
}
if ($f != "{")
parserr($f, "{")
f++
if ($end != "}")
parserr($end, "}")
end--
if ($end != ";")
parserr($end, ";")
end--
if ($end != ")")
parserr($end, ")")
end--
f++ #function return type
funcname=$f
if (funcalias == "")
funcalias = funcname
if (argalias == "") {
argalias = funcname "_args"
if ($2 == "COMPAT")
argalias = "o" argalias
}
f++
if ($f != "(")
parserr($f, ")")
f++
if (f == end) {
if ($f != "void")
parserr($f, "argument definition")
return
}
while (f <= end) {
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")
if (argtype[argc] == "off_t")
bigargc++
argname[argc]=$f;
f += 2; # skip name, and any comma
}
}
{ comment = $4
if (NF < 7)
for (i = 5; i <= NF; i++)
comment = comment " " $i
}
$2 == "STD" || $2 == "NODEF" || $2 == "NOARGS" || $2 == "NOPROTO" {
parseline()
if ((!nosys || funcname != "nosys") && \
(funcname != "lkmnosys")) {
if (argc != 0 && $2 != "NOARGS" && $2 != "NOPROTO") {
printf("struct\t%s {\n", argalias) > sysarg
for (i = 1; i <= argc; i++)
printf("\t%s %s;\n", argtype[i],
argname[i]) > sysarg
printf("};\n") > sysarg
}
else if($2 != "NOARGS" && $2 != "NOPROTO")
printf("struct\t%s {\n\tint dummy;\n};\n", \
argalias) > sysarg
}
if ($2 != "NOPROTO" && (!nosys || funcname != "nosys") && \
(!lkmnosys || funcname != "lkmnosys")) {
if (funcname == "exit")
printf("__dead ") > sysdcl
printf("%s\t%s __P((struct proc *, struct %s *, int []));\n", \
rettype, funcname, argalias) > sysdcl
}
if (funcname == "nosys")
nosys = 1
if (funcname == "lkmnosys")
lkmnosys = 1
printf("\t{ %d, (sy_call_t *)%s },\t\t", \
argc+bigargc, funcname) > sysent
if(length(funcname) < 11)
printf("\t") > sysent
printf("/* %d = %s */\n", syscall, funcalias) > sysent
printf("\t\"%s\",\t\t\t/* %d = %s */\n", \
funcalias, syscall, funcalias) > sysnames
if ($2 != "NODEF")
printf("#define\t%s%s\t%d\n", syscallprefix, \
funcalias, syscall) > syshdr
if ($3 != "NOHIDE")
printf("HIDE_%s(%s)\n", $3, funcname) > syshide
syscall++
next
}
$2 == "COMPAT" || $2 == "CPT_NOA" {
parseline()
if (argc != 0 && $2 != "CPT_NOA") {
printf("struct\t%s {\n", argalias) > syscompat
for (i = 1; i <= argc; i++)
printf("\t%s %s;\n", argtype[i],
argname[i]) > syscompat
printf("};\n") > syscompat
}
else if($2 != "CPT_NOA")
printf("struct\t%s {\n\tint dummy;\n};\n", \
argalias) > sysarg
printf("%s\to%s __P((struct proc *, struct %s *, int []));\n", \
rettype, funcname, argalias) > syscompatdcl
printf("\t{ compat(%d,%s) },\t\t/* %d = old %s */\n", \
argc+bigargc, funcname, syscall, funcalias) > sysent
printf("\t\"old.%s\",\t\t/* %d = old %s */\n", \
funcalias, syscall, funcalias) > sysnames
printf("\t\t\t\t/* %d is old %s */\n", \
syscall, funcalias) > syshdr
if ($3 != "NOHIDE")
printf("HIDE_%s(%s)\n", $3, funcname) > syshide
syscall++
next
}
$2 == "LIBCOMPAT" {
parseline()
printf("%s\to%s();\n", rettype, funcname) > syscompatdcl
printf("\t{ compat(%d,%s) },\t\t/* %d = old %s */\n", \
argc+bigargc, funcname, syscall, funcalias) > sysent
printf("\t\"old.%s\",\t\t/* %d = old %s */\n", \
funcalias, syscall, funcalias) > sysnames
printf("#define\t%s%s\t%d\t/* compatibility; still used by libc */\n", \
syscallprefix, funcalias, syscall) > syshdr
if ($3 != "NOHIDE")
printf("HIDE_%s(%s)\n", $3, funcname) > syshide
syscall++
next
}
$2 == "OBSOL" {
printf("\t{ 0, (sy_call_t *)nosys },\t\t\t/* %d = obsolete %s */\n", \
syscall, comment) > sysent
printf("\t\"obs_%s\",\t\t\t/* %d = obsolete %s */\n", \
$4, syscall, comment) > sysnames
printf("\t\t\t\t/* %d is obsolete %s */\n", \
syscall, comment) > syshdr
if ($3 != "NOHIDE")
printf("HIDE_%s(%s)\n", $3, $4) > syshide
syscall++
next
}
$2 == "UNIMPL" {
printf("\t{ 0, (sy_call_t *)nosys },\t\t\t/* %d = %s */\n", \
syscall, comment) > sysent
printf("\t\"#%d\",\t\t\t/* %d = %s */\n", \
syscall, syscall, comment) > sysnames
if ($3 != "NOHIDE")
printf("HIDE_%s(%s)\n", $3, $4) > syshide
syscall++
next
}
{
printf "%s: line %d: unrecognized keyword %s\n", infile, NR, $2
exit 1
}
END {
printf("\n#endif /* %s */\n", compat) > syscompatdcl
printf("\n#endif /* !%s */\n", sysproto_h) > syscompatdcl
printf("};\n") > sysent
printf("};\n") > sysnames
printf("#define\t%sMAXSYSCALL\t%d\n", syscallprefix, syscall) \
> syshdr
} '
cat $sysinc $sysent >$syssw
cat $sysarg $sysdcl $syscompat $syscompatdcl > $sysproto