elks-enhanced - XT-Emporium

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#!/bin/sh -
#
# This program generates entry.S from syscall.dat

cat <<'.eof'
#include <linuxmt/config.h>
/* Switched to V7 system call layout... Chad - 1/5/96
 */

//	The call table - autogenerated from syscall.dat

	.code16
	.text

	.p2align 1
sys_call_table:
.eof

tr '[A-Z]' '[a-z]' < syscall.dat | \
awk '/^#/{next;}
/^[	 ]$/{next;}
{
   callno = 0+$2;
   if ( $4 != "-" )
      assigned_to[callno] = $1;

   if ( $4 == "=" )
      depends_on[callno] = toupper($5);

   if ( $3 == "x" || $3 == "" ) next;
   else if ( $4 == "@" || $4 == "-" ) next;

   # Not implemented yet
   if ( substr($2, 1, 1) != "+" ) next;

   if ( maxno < callno ) maxno = callno;

   str = "\t.word sys_" $1;
   line[callno] = sprintf("%-25s // %3d", str, callno);
}
END{
   for (maxstd=maxno; depends_on[maxstd]!=""; maxstd--)
   {
      X = X;
   }
   for (callno=0; callno<=maxno; callno++)
   {
#      if ( assigned_to[callno] == "fork" )
#        gsub("_sys_fork", "_do_fork ", line[callno]);

      if ( assigned_to[callno] == "insmod" )
         gsub("_sys_insmod", "_module_init", line[callno]);

      if ( depends_on[callno] != "" )
         printf "#ifdef %s\n", depends_on[callno]

      if ( callno in line )
         print line[callno];
      else
      {
         if ( assigned_to[callno] == "" )
            assigned_to[callno] = "unassigned";
#        if ( assigned_to[callno] == "vfork" )
# {
#           str = "\t.word _do_fork";
# }
# else
            str = "\t.word _no_syscall";
         printf "%-25s // %3d - %s\n", str, callno, assigned_to[callno];
      }

      if ( depends_on[callno] != "" )
      {
         if ( callno < maxno )
         {
            str = "\t.word _no_syscall";
            printf "#else\n%-25s // %3d - %s\n", str, callno, assigned_to[callno]
         }

         printf "#endif\n"
      }
   }
}
'

cat <<'.eof'

sys_call_table_end:

.set sys_call_len, (sys_call_table_end - sys_call_table)/2

//	Dispatch a syscall (called from syscall_int)
//	Entry: ax=function code, stack contains parameters

	.text
	.global syscall
	.global _no_syscall

syscall:
	cmp  $sys_call_len,%ax
	ja   _no_syscall
	// look up address and jump to function
	mov  %ax,%bx
	add  %ax,%bx              // multiply by 2
	cs
	jmp    *sys_call_table(%bx)

//	All unimplemented calls
	
_no_syscall:
	mov	$-38,%ax
	ret

.eof
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