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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 for the 386
#
# 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
rm -f syscall.c syscall.mak
tr '[A-Z]' '[a-z]' < syscall.dat | \
awk '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_32__\n");
printf("#asm\n");
printf(" .text\n");
printf(" .align 4\n");
printf("#endasm\n\n");
COMPACT=0;
}
/^[ ]*#/ { next; }
/^[ ]*$/ { next; }
{
if( $2 > max_call ) max_call = $2;
if( $3 == "x" || $3 == "" ) next;
else if( $4 == "-" ) next;
else if( $4 == "*" ) funcname="__" $1;
else funcname=$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");
printf("export _%s\n", funcname);
printf("_%s:\n", funcname);
# Inline assembler max to 5 args (20 bytes)
if( $3 != 4 && $3 != 5 && ( COMPACT || $3 > 5 ))
{
if( $3 == 0 )
{
printf(" mov eax,#%d\n", $2);
}
else
{
printf("#if __FIRST_ARG_IN_AX__\n");
printf(" mov edx,#%d\n", $2);
printf("#else\n");
printf(" mov eax,#%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 >= 1 ) printf(" mov ebx,eax\n");
if( $3 >= 2 ) printf(" mov ecx,[esp+4]\n");
if( $3 >= 3 ) printf(" mov edx,[esp+8]\n");
if( $3 >= 4 ) printf(" push esi\n");
if( $3 >= 4 ) printf(" mov esi,[esp+16]\n");
if( $3 >= 5 ) printf(" push edi\n");
if( $3 >= 5 ) printf(" mov edi,[esp+24]\n");
if( $3 >= 1 ) printf("#else\n");
if( $3 >= 1 ) printf(" mov ebx,[esp+4]\n");
if( $3 >= 2 ) printf(" mov ecx,[esp+8]\n");
if( $3 >= 3 ) printf(" mov edx,[esp+12]\n");
if( $3 >= 4 ) printf(" push esi\n");
if( $3 >= 4 ) printf(" mov esi,[esp+20]\n");
if( $3 >= 5 ) printf(" push edi\n");
if( $3 >= 5 ) printf(" mov edi,[esp+28]\n");
if( $3 >= 1 ) printf("#endif\n");
printf(" mov eax,#%d\n", $2);
printf(" int $80\n");
if( $3 >= 5 ) printf(" pop edi\n");
if( $3 >= 4 ) printf(" pop esi\n");
printf(" test eax,eax\n");
printf(" jl syscall_err\n");
printf(" ret\n");
printf("syscall_err:\n");
printf(" neg eax\n");
printf(" mov [_errno],eax\n");
printf(" mov eax,#-1\n");
printf(" ret\n");
}
printf("#endasm\n");
printf("#endif\n\n");
}
END{
printf("#endif /* __AS386_32__ */\n\n");
printf("#endif /* __MSDOS__ */\n\n");
printf("%s\n", obj) > "syscall.mak";
printf "\n" > "syscall.mak";
}' > syscall.c
cat >> syscall.mak <<\!
CFLAGS=$(ARCH) $(CCFLAGS) $(DEFS)
all: $(LIBC)($(OBJ))
@$(RM) $(OBJ)
$(LIBC)($(OBJ)): syscall.dat
$(CC) $(CFLAGS) -DL_$* syscall.c -c -o $*.o
$(AR) $(ARFLAGS) $@ $*.o
!
exit $?
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