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|
# Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>
# This file is part of the Linux-8086 C library and is distributed
# under the GNU Library General Public License.
#
# This script generates the 'simple' system calls.
#
# Each call is put into it's own object file, if the semantics of the
# call are not correct UNIX then the 4th field in the dat file has a
# marker and the function is generated with a __ prefix.
#
#
# Different levels of squeeze
# 0 = each is complete
# 1 = Short codes calling common function
COMPACT=1
rm -f syscall.c syscall.mak call_tab.v defn_tab.v
tr '[A-Z]' '[a-z]' < syscall.dat | \
awk -v COMPACT=$COMPACT 'BEGIN{
print "# Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>" > "syscall.mak";
print "# This file is part of the Linux-8086 C library and is distributed" > "syscall.mak";
print "# under the GNU Library General Public License." > "syscall.mak";
print "# " > "syscall.mak";
print "# This file is automatically generated\n" > "syscall.mak"
print "/* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>";
print " * This file is part of the Linux-8086 C library and is distributed";
print " * under the GNU Library General Public License.";
print " * ";
print " * This file is automatically generated */\n"
obj="OBJ=";
print "/* Standard start */\n\n"
printf("#ifndef __MSDOS__\n");
printf("#ifdef __AS386_16__\n");
printf("#asm\n");
printf(" .text\n");
printf(" .even\n");
printf("#endasm\n\n");
{
obj=obj "__syscall.o __syscall4.o ";
print "/* Shared system call code */\n"
printf("#ifdef L___syscall\n", funcname);
printf("#asm\n");
printf("#if __FIRST_ARG_IN_AX__\n");
printf("export sys_call3\nsys_call3:\n");
printf(" mov bx,sp\n");
printf(" mov cx,[bx+2]\n");
printf(" mov bx,[bx+4]\n");
# ax=arg1 bx=arg3 cx=arg2 dx=arg0
printf(" xchg ax,bx\n");
# ax=arg3 bx=arg1 cx=arg2 dx=arg0
printf(" xchg ax,dx\n");
# ax=arg0 bx=arg1 cx=arg2 dx=arg3
printf(" jmp sys_call0\n\n");
printf("export sys_call2\nsys_call2:\n");
printf(" mov bx,sp\n");
printf(" mov cx,[bx+2]\n");
printf(" mov bx,ax\n");
printf(" mov ax,dx\n");
printf(" jmp sys_call0\n\n");
printf("export sys_call1\nsys_call1:\n");
printf(" mov bx,ax\n");
printf(" mov ax,dx\n");
printf("#else\n");
printf("export sys_call3\nsys_call3:\n");
printf(" mov bx,sp\n");
printf(" mov dx,[bx+6]\n");
printf(" mov cx,[bx+4]\n");
printf(" mov bx,[bx+2]\n");
printf(" jmp sys_call0\n\n");
printf("export sys_call2\nsys_call2:\n");
printf(" mov bx,sp\n");
printf(" mov cx,[bx+4]\n");
printf(" mov bx,[bx+2]\n");
printf(" jmp sys_call0\n\n");
printf("export sys_call1\nsys_call1:\n");
printf(" mov bx,sp\n");
printf(" mov bx,[bx+2]\n");
printf("#endif\n\n");
printf("export sys_call0\nsys_call0:\n");
printf(" int $80\n");
printf(" test ax,ax\n");
printf(" jge syscall_ok\n");
printf(" neg ax\n");
printf(" mov [_errno],ax\n");
printf(" mov ax,#-1\n");
printf("syscall_ok:\n");
printf(" ret\n");
printf("#endasm\n");
printf("#endif\n\n");
print "/* Shared system call code, syscalls with 4/5 args */\n"
printf("#ifdef L___syscall4\n", funcname);
printf("#asm\n");
printf("#if __FIRST_ARG_IN_AX__\n");
printf("export sys_call4\nsys_call4:\n");
printf("export sys_call5\nsys_call5:\n");
printf(" mov bx,sp\n");
printf(" push si\n");
printf(" mov si,[bx+8]\n");
printf(" push di\n");
printf(" mov di,[bx+6]\n");
printf(" mov cx,[bx+2]\n");
printf(" mov bx,[bx+4]\n");
# ax=arg1 bx=arg3 cx=arg2 dx=arg0
printf(" xchg ax,bx\n");
# ax=arg3 bx=arg1 cx=arg2 dx=arg0
printf(" xchg ax,dx\n");
# ax=arg0 bx=arg1 cx=arg2 dx=arg3
printf("#else\n");
printf("export sys_call4\nsys_call4:\n");
printf("export sys_call5\nsys_call5:\n");
printf(" mov bx,sp\n");
printf(" push si\n");
printf(" mov si,[bx+10]\n");
printf(" push di\n");
printf(" mov di,[bx+8]\n");
printf(" mov dx,[bx+6]\n");
printf(" mov cx,[bx+4]\n");
printf(" mov bx,[bx+2]\n");
printf("#endif\n\n");
printf(" int $80\n");
printf(" pop di\n");
printf(" pop si\n");
printf(" test ax,ax\n");
printf(" jge syscall_ok\n");
printf(" neg ax\n");
printf(" mov [_errno],ax\n");
printf(" mov ax,#-1\n");
printf("syscall_ok:\n");
printf(" ret\n");
printf("#endasm\n");
printf("#endif\n\n");
}
}
/^[ ]*#/ { next; }
/^[ ]*$/ { next; }
{
if( $2 > max_call ) max_call = $2;
if( !($2 in calltab) )
callwas[$2] = " /* " $1 " */";
if( $3 == "x" || $3 == "" ) next;
else if( $4 == "-" ) next;
else if( $4 == "*" ) funcname="__" $1;
else funcname=$1;
calltab[$2] = $1;
if( length(obj) > 60 )
{
printf("%s\t\\\n", obj) > "syscall.mak";
obj=" ";
}
obj=obj funcname ".o ";
printf "/* CALL %s */\n\n", $0;
printf("#ifdef L_%s\n", funcname);
printf("#asm\n", funcname);
printf("export _%s\n", funcname);
printf("_%s:\n", funcname);
# Inline assembler max to 5 args (10 bytes)
if( $3 != 4 && $3 != 5 && ( COMPACT || $3 > 5 ))
{
if( $3 == 0 )
{
printf(" mov ax,#%d\n", $2);
}
else
{
printf("#if __FIRST_ARG_IN_AX__\n");
printf(" mov dx,#%d\n", $2);
printf("#else\n");
printf(" mov ax,#%d\n", $2);
printf("#endif\n");
}
printf(" br sys_call%d\n", $3);
}
else
{
if( $3 >= 1 )
printf("#if __FIRST_ARG_IN_AX__\n");
if( $3 >= 2 )
printf(" mov bx,sp\n");
if( $3 >= 5 )
printf(" push si\n");
if( $3 >= 5 )
printf(" mov si,[bx+8]\n");
if( $3 >= 4 )
printf(" push di\n");
if( $3 >= 4 )
printf(" mov di,[bx+6]\n");
if( $3 >= 3 )
printf(" mov dx,[bx+4]\n");
if( $3 >= 2 )
printf(" mov cx,[bx+2]\n");
if( $3 >= 1 )
printf(" mov bx,ax\n");
if( $3 >= 1 )
printf("#else\n");
if( $3 >= 1 )
printf(" mov bx,sp\n");
if( $3 >= 5 )
printf(" push si\n");
if( $3 >= 5 )
printf(" mov si,[bx+10]\n");
if( $3 >= 4 )
printf(" push di\n");
if( $3 >= 4 )
printf(" mov di,[bx+8]\n");
if( $3 >= 3 )
printf(" mov dx,[bx+6]\n");
if( $3 >= 2 )
printf(" mov cx,[bx+4]\n");
if( $3 >= 1 )
printf(" mov bx,[bx+2]\n");
if( $3 >= 1 )
printf("#endif\n");
printf(" mov ax,#%d\n", $2);
printf(" int $80\n");
if( $3 >= 4 )
printf(" pop di\n");
if( $3 >= 5 )
printf(" pop si\n");
printf(" test ax,ax\n");
printf(" jl syscall_err\n");
printf(" ret\n");
printf("syscall_err:\n");
printf(" neg ax\n");
printf(" mov [_errno],ax\n");
printf(" mov ax,#-1\n");
printf(" ret\n");
}
printf("#endasm\n");
printf("#endif\n\n");
}
END{
for(i=0; i<=max_call; i++)
if( i in calltab )
{
printf("#ifndef sys_%s\n", calltab[i]) > "defn_tab.v";
printf("#define sys_%s sys_enosys\n", calltab[i]) > "defn_tab.v";
printf("#endif\n\n") > "defn_tab.v";
}
for(i=0; i<=max_call; i++)
if( i in calltab )
printf("/* %3d */ sys_%s,\n", i, calltab[i]) > "call_tab.v";
else
printf("/* %3d */ sys_enosys,%s\n", i, callwas[i]) > "call_tab.v";
printf("#endif /* __AS386_16__ */\n\n");
printf("#endif /* __MSDOS__ */\n\n");
printf("%s\n", obj) > "syscall.mak";
printf "\n" > "syscall.mak";
}' > syscall.c
cat >> syscall.mak <<\!
TOP=..
include $(TOP)/Make.defs
all: $(OBJ)
libc.a: $(OBJ)
ar r ../$(LIBC) $(OBJ)
@touch libc.a
$(OBJ): syscall.dat mksyscall
$(CC) $(CFLAGS) -c -DL_$* -o $@ syscall.c
!
rv=$?
if [ "$rv" != 0 ]
then exit $rv
fi
export MAKELEVEL
MAKELEVEL=0
exec make -f syscall.mak $1
|
