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{
This file is part of the Free Pascal run time library.
Copyright (c) 2008 by the Free Pascal development team.
Processor dependent implementation for the system unit for
AVR
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.
**********************************************************************}
{$asmmode gas}
Procedure SysInitFPU;{$ifdef SYSTEMINLINE}inline;{$endif}
begin
end;
procedure fpc_cpuinit;
begin
SysInitFPU;
end;
{$IFNDEF INTERNAL_BACKTRACE}
{$define FPC_SYSTEM_HAS_GET_FRAME}
function get_frame:pointer;assembler;nostackframe;
asm
end;
{$ENDIF not INTERNAL_BACKTRACE}
{$define FPC_SYSTEM_HAS_GET_CALLER_ADDR}
function get_caller_addr(framebp:pointer):pointer;assembler;
asm
end;
{$define FPC_SYSTEM_HAS_GET_CALLER_FRAME}
function get_caller_frame(framebp:pointer):pointer;assembler;
asm
end;
{$define FPC_SYSTEM_HAS_SPTR}
Function Sptr : pointer;assembler;
asm
end;
function InterLockedDecrement (var Target: longint) : longint;
var
sreg : byte;
begin
{ block interrupts }
asm
in r0,0x3f
std sreg,r0
cli
end;
dec(Target);
Result:=Target;
{ release interrupts }
asm
ldd r0,sreg
out 0x3f,r0
end;
end;
function InterLockedIncrement (var Target: longint) : longint;
var
sreg : byte;
begin
{ block interrupts }
asm
in r0,0x3f
std sreg,r0
cli
end;
inc(Target);
Result:=Target;
{ release interrupts }
asm
ldd r0,sreg
out 0x3f,r0
end;
end;
function InterLockedExchange (var Target: longint;Source : longint) : longint;
var
sreg : byte;
begin
{ block interrupts }
asm
in r0,0x3f
std sreg,r0
cli
end;
Result:=Target;
Target:=Source;
{ release interrupts }
asm
ldd r0,sreg
out 0x3f,r0
end;
end;
function InterlockedCompareExchange(var Target: longint; NewValue: longint; Comperand: longint): longint;
var
sreg : byte;
begin
{ block interrupts }
asm
in r0,0x3f
std sreg,r0
cli
end;
Result:=Target;
if Target=Comperand then
Target:=NewValue;
{ release interrupts }
asm
ldd r0,sreg
out 0x3f,r0
end;
end;
function InterLockedExchangeAdd (var Target: longint;Source : longint) : longint;
var
sreg : byte;
begin
{ block interrupts }
asm
in r0,0x3f
std sreg,r0
cli
end;
Result:=Target;
inc(Target,Source);
{ release interrupts }
asm
ldd r0,sreg
out 0x3f,r0
end;
end;
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