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{
$Id: syscall.inc,v 1.1 2003/01/08 22:32:28 marco Exp $
Copyright (c) 1998-2000 by Florian Klaempfl
This include implements the actual system call for the
intel BeOS 80x86 platform.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
// Under BeOS, we use stdcall for this line because the default calling convention in 1.9
// is register instead of stdcall. But assembler is already written, so i used the stdcall
// calling convention !
function Do_SysCall( callnr : longint; var regs : SysCallArgs ): longint; stdcall; assembler; [public, alias : 'FPC_SYSCALL'];
{
This routine sets up the parameters on the stack, all the parameters
are in reverse order on the stack (like C parameter passing).
}
asm
{ load the parameters... }
movl regs,%eax
movl 24(%eax),%ebx
pushl %ebx
movl 20(%eax),%ebx
pushl %ebx
movl 16(%eax),%ebx
pushl %ebx
movl 12(%eax),%ebx
pushl %ebx
movl 8(%eax),%ebx
pushl %ebx
movl 4(%eax),%ebx
pushl %ebx
movl 0(%eax),%ebx
pushl %ebx
{ set the call number }
movl callnr,%eax
call sys_call
addl $28,%esp
end;
// Under BeOS, we use stdcall for this line because the default calling convention in 1.9
// is register instead of stdcall. But assembler is already written, so i used the stdcall
// calling convention ! Maybe don't needed here. But to be sure...
Function SysCall( callnr:longint;var args : SysCallArgs ):longint; stdcall;
{
This function serves as an interface to do_SysCall.
If the SysCall returned a negative number, it returns -1, and puts the
SysCall result in errno. Otherwise, it returns the SysCall return value
}
var
funcresult : longint;
begin
funcresult := do_SysCall(callnr, args);
if funcresult < 0 then
begin
errno := funcresult;
SysCall := - 1;
end
else
begin
SysCall := funcresult;
errno := 0;
end;
end;
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