{
    $Id$

    This file is part of the Free Pascal run time library.
    Copyright (c) 2003 by the Free Pascal development team.

    Processor dependent implementation for the system unit for
    ARM

    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.

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

{$asmmode gas}

procedure fpc_cpuinit;
begin
  asm
    rfs r0
    and r0,r0,#0xffe0ffff
    orr r0,r0,#0x00020000
    wfs r0
  end;
end;

{****************************************************************************
                       stack frame related stuff
****************************************************************************}

{$define FPC_SYSTEM_HAS_GET_FRAME}
function get_frame:pointer;assembler;nostackframe;{$ifdef SYSTEMINLINE}inline;{$endif}
asm
  mov    r0,r11
end ['R0'];


{$define FPC_SYSTEM_HAS_GET_CALLER_ADDR}
function get_caller_addr(framebp:pointer):pointer;assembler;{$ifdef SYSTEMINLINE}inline;{$endif}
asm
  movs r0,r0
  beq .Lg_a_null
  ldr r0,[r0,#-4]
.Lg_a_null:
end ['R0'];


{$define FPC_SYSTEM_HAS_GET_CALLER_FRAME}
function get_caller_frame(framebp:pointer):pointer;assembler;{$ifdef SYSTEMINLINE}inline;{$endif}
asm
  movs r0,r0
  beq .Lgnf_null
  ldr r0,[r0,#-12]
.Lgnf_null:
end ['R0'];


{$define FPC_SYSTEM_HAS_SPTR}
Function Sptr : pointer;assembler;{$ifdef SYSTEMINLINE}inline;{$endif}
asm
  mov    r0,sp
end ['R0'];


{$define FPC_SYSTEM_HAS_FILLCHAR}
Procedure FillChar(var x;count:longint;value:byte);assembler;nostackframe;
asm
	// less than 0?
	cmp r1,#0
	movlt pc,lr
	mov	r3,r0
	cmp	r1,#8		// at least 8 bytes to do?
	blt	.LFillchar2
	orr r2,r2,r2,lsl #8
	orr r2,r2,r2,lsl #16
.LFillchar0:
	tst	r3,#3		// aligned yet?
	strneb r2,[r3],#1
	subne	r1,r1,#1
	bne	.LFillchar0
	mov	ip,r2
.LFillchar1:
	cmp	r1,#8		// 8 bytes still to do?
	blt	.LFillchar2
	stmia	r3!,{r2,ip}
	sub	r1,r1,#8
	cmp	r1,#8		// 8 bytes still to do?
	blt	.LFillchar2
	stmia	r3!,{r2,ip}
	sub	r1,r1,#8
	cmp	r1,#8		// 8 bytes still to do?
	blt	.LFillchar2
	stmia	r3!,{r2,ip}
	sub	r1,r1,#8
	cmp	r1,#8		// 8 bytes still to do?
	stmgeia	r3!,{r2,ip}
	subge	r1,r1,#8
	bge	.LFillchar1
.LFillchar2:
	movs r1,r1		// anything left?
	moveq pc,lr
	rsb	r1,r1,#7
	add	pc,pc,r1,lsl #2
	mov	r0,r0
	strb r2,[r3],#1
	strb r2,[r3],#1
	strb r2,[r3],#1
	strb r2,[r3],#1
	strb r2,[r3],#1
	strb r2,[r3],#1
	strb r2,[r3],#1
	mov pc,lr
end;


{
  $Log$
  Revision 1.10  2005-01-05 15:59:02  florian
    + added nostackframe directive to get_frame

  Revision 1.9  2005/01/05 15:21:14  florian
    * fillchar fixed; it's used now

  Revision 1.8  2005/01/04 16:46:38  florian
    + correct setting of FPU exception mask

  Revision 1.7  2004/03/23 21:03:10  florian
    + assembler implementation of fpc_mul_qword
    * fpu exceptions are now generated

  Revision 1.6  2004/03/14 21:45:11  florian
    * draft for qword mul

  Revision 1.5  2004/01/21 23:12:07  florian
    + get_caller_addr/frame implemented

  Revision 1.4  2004/01/20 21:01:57  florian
    * fixed setjump
    * fixed syscalls

  Revision 1.3  2003/11/21 00:40:06  florian
    * some arm issues fixed

  Revision 1.2  2003/09/03 14:09:37  florian
    * arm fixes to the common rtl code
    * some generic math code fixed
    * ...

  Revision 1.1  2003/08/21 16:41:54  florian
    * empty dummy files
    + [long|set]jmp implemented
}