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{
This file is part of the Free Pascal run time library.
Copyright (c) 2013 by the Free Pascal development team.
Processor dependent implementation for the system unit for
intel i8086+
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.
**********************************************************************}
procedure fpc_cpuinit;
begin
end;
{$define FPC_SYSTEM_HAS_SPTR}
Function Sptr : Pointer;assembler;nostackframe;
asm
mov ax, sp
end;
{$define FPC_SYSTEM_HAS_PTR}
function Ptr(sel,off: LongInt):farpointer;{$ifdef SYSTEMINLINE}inline;{$endif}assembler;nostackframe;
asm
mov si, sp
mov ax, ss:[si + 4 + extra_param_offset] // off
mov dx, ss:[si + 8 + extra_param_offset] // sel
end;
{$define FPC_SYSTEM_HAS_CSEG}
function CSeg: Word;{$ifdef SYSTEMINLINE}inline;{$endif}assembler;nostackframe;
asm
mov ax, cs
end;
{$define FPC_SYSTEM_HAS_DSEG}
function DSeg: Word;{$ifdef SYSTEMINLINE}inline;{$endif}assembler;nostackframe;
asm
mov ax, ds
end;
{$define FPC_SYSTEM_HAS_SSEG}
function SSeg: Word;{$ifdef SYSTEMINLINE}inline;{$endif}assembler;nostackframe;
asm
mov ax, ss
end;
{$IFNDEF INTERNAL_BACKTRACE}
{$define FPC_SYSTEM_HAS_GET_FRAME}
function get_frame:pointer;assembler;nostackframe;{$ifdef SYSTEMINLINE}inline;{$endif}
asm
mov ax, bp
end;
{$ENDIF not INTERNAL_BACKTRACE}
{$define FPC_SYSTEM_HAS_GET_PC_ADDR}
Function Get_pc_addr : CodePointer;assembler;nostackframe;
asm
mov bx, sp
mov ax, ss:[bx]
{$ifdef FPC_X86_CODE_FAR}
mov dx, ss:[bx+2]
{$endif FPC_X86_CODE_FAR}
end;
{$define FPC_SYSTEM_HAS_GET_CALLER_ADDR}
function get_caller_addr(framebp:pointer;addr:codepointer=nil):codepointer;nostackframe;assembler;
asm
mov si, sp
{$ifdef FPC_X86_CODE_FAR}
xor dx, dx
{$endif FPC_X86_CODE_FAR}
mov ax, ss:[si + 6 + extra_param_offset + extra_param_offset] // framebp
or ax, ax
jz @@Lg_a_null
xchg ax, bx
mov bx, [bx+2]
{$ifdef FPC_X86_CODE_FAR}
mov dx, [bx+4]
{$endif FPC_X86_CODE_FAR}
xchg ax, bx
@@Lg_a_null:
end;
{$define FPC_SYSTEM_HAS_GET_CALLER_FRAME}
function get_caller_frame(framebp:pointer;addr:codepointer=nil):pointer;nostackframe;assembler;
asm
mov si, sp
mov ax, ss:[si + 6 + extra_param_offset + extra_param_offset] // framebp
or ax, ax
jz @@Lgnf_null
xchg ax, bx
mov bx, [bx]
xchg ax, bx
@@Lgnf_null:
end;
{TODO: fix, use smallint?}
function InterLockedDecrement (var Target: longint) : longint; assembler;
asm
push bp
mov bp, sp
mov bx, ss:[bp + 4 + extra_param_offset] // Target
sub word [bx], 1
sbb word [bx+2], 0
mov ax, [bx]
mov dx, [bx+2]
pop bp
end;
{TODO: fix, use smallint?}
function InterLockedIncrement (var Target: longint) : longint; assembler;
asm
push bp
mov bp, sp
mov bx, ss:[bp + 4 + extra_param_offset] // Target
add word [bx], 1
adc word [bx+2], 0
mov ax, [bx]
mov dx, [bx+2]
pop bp
end;
{TODO: fix, use smallint?}
function InterLockedExchange (var Target: longint;Source : longint) : longint;
begin
InterLockedExchange := Target;
Target := Source;
end;
{TODO: implement}
function InterLockedExchangeAdd (var Target: longint;Source : longint) : longint;
begin
runerror(304);
end;
{TODO: implement}
function InterlockedCompareExchange(var Target: longint; NewValue: longint; Comperand: longint): longint;
begin
runerror(304);
end;
{****************************************************************************
FPU
****************************************************************************}
const
{ Internal constants for use in system unit }
FPU_Invalid = 1;
FPU_Denormal = 2;
FPU_DivisionByZero = 4;
FPU_Overflow = 8;
FPU_Underflow = $10;
FPU_StackUnderflow = $20;
FPU_StackOverflow = $40;
FPU_ExceptionMask = $ff;
{ use Default8087CW instead
fpucw : word = $1300 or FPU_StackUnderflow or FPU_Underflow or FPU_Denormal;
}
{ returns true if FPU is present }
function DetectFPU: boolean;
var
localfpucw: word;
begin
asm
fninit
mov byte [localfpucw + 1], 0
fnstcw localfpucw
end;
DetectFPU:=(localfpucw and $FF00)=$0300;
end;
{$define FPC_SYSTEM_HAS_SYSINITFPU}
Procedure SysInitFPU;
var
{ these locals are so we don't have to hack pic code in the assembler }
localmxcsr: dword;
localfpucw: word;
begin
localfpucw:=Default8087CW;
asm
fninit
fldcw localfpucw
fwait
end;
softfloat_exception_mask:=float_flag_underflow or float_flag_inexact or float_flag_denormal;
end;
{$define FPC_SYSTEM_HAS_SYSRESETFPU}
Procedure SysResetFPU;
var
{ these locals are so we don't have to hack pic code in the assembler }
localmxcsr: dword;
localfpucw: word;
begin
localfpucw:=Default8087CW;
asm
fninit
fwait
fldcw localfpucw
end;
softfloat_exception_flags:=0;
end;
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