freepascal.compiler/rtl/linux/arm/syscall.inc

{
    $Id$
    This file is part of the Free Pascal run time library.
    Copyright (c) 2003 by Florian Klaempfl,
    member of the Free Pascal development team.

    See the file COPYING.FPC, included in this distribution,
    for details about the copyright.

    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.

 **********************************************************************}

{No debugging for syslinux include !}
{$IFDEF SYS_LINUX}
  {$UNDEF SYSCALL_DEBUG}
{$ENDIF SYS_LINUX}


{*****************************************************************************
                     --- Main:The System Call Self ---
*****************************************************************************}

function FpSysCall(sysnr:TSysParam):TSysResult; assembler;[public,alias:'FPC_SYSCALL0'];
{
  This function puts the registers in place, does the call, and then
  copies back the registers as they are after the SysCall.
}
asm
  swi  #0x900071
  cmn  r0,#126
  bls  .LDone
  ldr  r1,.LErrno
  rsb  r0,r0,#0
  str  r0,[r1]
  mvn  r0,#0
  b    .LDone
.LErrno:
  .word Errno
.LDone:
end;


function FpSysCall(sysnr,param1:TSysParam):TSysResult; assembler;[public,alias:'FPC_SYSCALL1'];
{
  This function puts the registers in place, does the call, and then
  copies back the registers as they are after the SysCall.
}
asm
  swi  #0x900071
  cmn  r0,#126
  bls  .LDone
  ldr  r1,.LErrno
  rsb  r0,r0,#0
  str  r0,[r1]
  mvn  r0,#0
  b    .LDone
.LErrno:
  .word Errno
.LDone:
end;


function FpSysCall(sysnr,param1,param2:TSysParam):TSysResult; assembler;[public,alias:'FPC_SYSCALL2'];
{
  This function puts the registers in place, does the call, and then
  copies back the registers as they are after the SysCall.
}
asm
  swi  #0x900071
  cmn  r0,#126
  bls  .LDone
  ldr  r1,.LErrno
  rsb  r0,r0,#0
  str  r0,[r1]
  mvn  r0,#0
  b    .LDone
.LErrno:
  .word Errno
.LDone:
end;


function FpSysCall(sysnr,param1,param2,param3:TSysParam):TSysResult; assembler;[public,alias:'FPC_SYSCALL3'];
{
  This function puts the registers in place, does the call, and then
  copies back the registers as they are after the SysCall.
}
asm
  swi  #0x900071
  cmn  r0,#126
  bls  .LDone
  ldr  r1,.LErrno
  rsb  r0,r0,#0
  str  r0,[r1]
  mvn  r0,#0
  b    .LDone
.LErrno:
  .word Errno
.LDone:
end;


function FpSysCall(sysnr,param1,param2,param3,param4:TSysParam):TSysResult; assembler;[public,alias:'FPC_SYSCALL4'];
{
  This function puts the registers in place, does the call, and then
  copies back the registers as they are after the SysCall.
}
asm
  stmfd r13!,{r4}
  ldr  r4,param4
  swi  #0x900071
  cmn  r0,#126
  bls  .LDone
  ldr  r1,.LErrno
  rsb  r0,r0,#0
  str  r0,[r1]
  mvn  r0,#0
  b    .LDone
.LErrno:
  .word Errno
.LDone:
  ldmfd r13!,{r4}
end;


function FpSysCall(sysnr,param1,param2,param3,param4,param5:TSysParam):TSysResult; assembler;[public,alias:'FPC_SYSCALL5'];
{
  This function puts the registers in place, does the call, and then
  copies back the registers as they are after the SysCall.
}
asm
  stmfd r13!,{r4-r5}
  ldr  r5,param5
  ldr  r4,param4
  swi  #0x900071
  cmn  r0,#126
  bls  .LDone
  ldr  r1,.LErrno
  rsb  r0,r0,#0
  str  r0,[r1]
  mvn  r0,#0
  b    .LDone
.LErrno:
  .word Errno
.LDone:
  ldmfd r13!,{r4-r5}
end;


function FpSysCall(sysnr,param1,param2,param3,param4,param5,param6:TSysParam):TSysResult; assembler;[public,alias:'FPC_SYSCALL6'];
{
  This function puts the registers in place, does the call, and then
  copies back the registers as they are after the SysCall.
}
asm
  stmfd r13!,{r4-r6}
  ldr  r6,param6
  ldr  r5,param5
  ldr  r4,param4
  swi  #0x900071
  cmn  r0,#126
  bls  .LDone
  ldr  r1,.LErrno
  rsb  r0,r0,#0
  str  r0,[r1]
  mvn  r0,#0
  b    .LDone
.LErrno:
  .word Errno
.LDone:
  ldmfd r13!,{r4-r6}
end;


// Old style syscall:
// Better use ktrace/strace/gdb for debugging.
Procedure FpSysCall(callnr:longint;var regs : SysCallregs);assembler;
{
  This function puts the registers in place, does the call, and then
  copies back the registers as they are after the SysCall.
}
asm
  stmfd r13!,{r4-r6}
  ldr  r2,[r1,#4]
  ldr  r3,[r1,#8]
  ldr  r4,[r1,#12]
  ldr  r5,[r1,#16]
  ldr  r6,[r1,#20]
  ldr  r1,[r1]
  swi  #0x900071
  cmn  r0,#126
  bls  .LDone
  ldr  r1,.LErrno
  rsb  r0,r0,#0
  str  r0,[r1]
  mvn  r0,#0
  b    .LDone
.LErrno:
  .word Errno
.LDone:
  ldmfd r13!,{r4-r6}
end;

{$IFDEF SYSCALL_DEBUG}
Const
  DoSysCallDebug : Boolean = False;

var
  LastCnt,
  LastEax,
  LastCall : longint;
  DebugTxt : string[20];
{$ENDIF}

Function SysCall( callnr:longint;var regs : SysCallregs ):longint;
{
  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
}
begin
  FpSysCall(callnr,regs);
  if regs.reg1<0 then
   begin
{$IFDEF SYSCALL_DEBUG}
     If DoSysCallDebug then
       debugtxt:=' syscall error: ';
{$endif}
     ErrNo:=-regs.reg1;
     SysCall:=-1;
   end
  else
   begin
{$IFDEF SYSCALL_DEBUG}
  if DoSysCallDebug then
       debugtxt:=' syscall returned: ';
{$endif}
     SysCall:=regs.reg1;
     errno:=0
   end;
{$IFDEF SYSCALL_DEBUG}
  if DoSysCallDebug then
    begin
    inc(lastcnt);
    if (callnr<>lastcall) or (regs.reg1<>lasteax) then
      begin
      if lastcnt>1 then
        writeln(sys_nr_txt[lastcall],debugtxt,lasteax,' (',lastcnt,'x)');
      lastcall:=callnr;
      lasteax:=regs.reg1;
      lastcnt:=0;
      writeln(sys_nr_txt[lastcall],debugtxt,lasteax);
      end;
    end;
{$endif}
end;

{
  $Log$
  Revision 1.4  2004-01-20 21:01:57  florian
    * fixed setjump
    * fixed syscalls

  Revision 1.3  2003/12/29 19:24:12  florian
    + introduced PtrInt and PtrUInt
    * made strscan 64 bit safe

  Revision 1.2  2003/12/03 17:34:12  florian
    + started to implement arm syscalls

  Revision 1.1  2003/08/28 00:08:29  florian
    * syscall skeleton
}