{
$Id: m68k.inc,v 1.4 2004/01/02 17:22:14 jonas Exp $
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2000 by Carl-Eric Codere,
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.
**********************************************************************}
{****************************************************************************
m68k.inc : Processor dependent implementation of system unit
For Motorola 680x0 Processor.
*****************************************************************************}
{****************************************************************************}
{ Credit where credit is due: }
{ -Some of the copy routines taken from the Atari dlib source code: }
{ Dale Schumacher (alias: Dalnefre') dal@syntel.uucp }
{ 399 Beacon Ave. St. Paul, MN 55104,USA }
{ -Some of the routines taken from the freeware ATARI Sozobon C compiler }
{ 1988 by Sozobon, Limited. Author: Johann Ruegg (freeware) }
{ Thanks to all these people wherever they maybe today! }
{****************************************************************************}
procedure fpc_cpuinit;
begin
end;
{ Don't call the following routines directly. }
Procedure Hlt;[public,alias: 'FPC_HALT_ERROR'];
{ called by code generator on run-time errors. }
{ on entry contains d0 = error code. }
var
b:byte; { only byte is used... }
begin
asm
move.b d0,b
end;
HandleError(b);
end;
Procedure FillChar(var x;count:longint;value:byte);[public,alias: 'FPC_FILL_OBJECT'];
begin
asm
move.l 8(a6), a0 { destination }
move.l 12(a6), d1 { number of bytes to fill }
move.b 16(a6),d0 { fill data }
cmpi.l #65535, d1 { check, if this is a word move }
ble @LMEMSET3 { use fast dbra mode }
bra @LMEMSET2
@LMEMSET1:
move.b d0,(a0)+
@LMEMSET2:
subq.l #1,d1
cmp.l #-1,d1
bne @LMEMSET1
bra @LMEMSET5 { finished slow mode , exit }
@LMEMSET4: { fast loop mode section 68010+ }
move.b d0,(a0)+
@LMEMSET3:
dbra d1,@LMEMSET4
@LMEMSET5:
end ['d0','d1','a0'];
end;
Procedure FillObject(var x; count: longint; value: byte);
begin
asm
move.l 8(a6), a0 { destination }
move.l 12(a6), d1 { number of bytes to fill }
move.w 16(a6),d0 { fill data }
cmp.l #65535, d1 { check, if this is a word move }
ble @LMEMSET3 { use fast dbra mode }
bra @LMEMSET2
@LMEMSET1:
move.b d0,(a0)+
@LMEMSET2:
subq.l #1,d1
cmp.l #-1,d1
bne @LMEMSET1
bra @LMEMSET5 { finished slow mode , exit }
@LMEMSET4: { fast loop mode section 68010+ }
move.b d0,(a0)+
@LMEMSET3:
dbra d1,@LMEMSET4
@LMEMSET5:
end ['d0','d1','a0'];
end;
procedure int_help_constructor;[public,alias:'FPC_HELP_CONSTRUCTOR'];
begin
asm
{ Entry without preamble, since we need the ESP of the
constructor }
{ Stack (relative to %ebp):
12 Self
8 VMT-Address
4 main programm-Addr
0 %ebp
}
{ do we have to initialize self }
{ we just need to check for zero }
move.l a5,d0
tst.l d0 { set flags }
bne @LHC_4
{ get memory, but save register first }
{ temporary variable }
subq.l #4,sp
move.l sp,a5
{ Save Registers }
movem.l d0-a7,-(sp)
{ Memory size }
move.l 8(a6),a0
move.l (a0),-(sp)
{ push method pointer }
move.l a5,-(sp)
jsr FPC_GETMEM
{ Restore all registers in the correct order }
movem.l (sp)+,d0-a7
{ Memory position to a5 }
move.l (a5),a5
addq.l #4,sp
{ If no memory available : fail() }
move.l a5,d0
tst.l d0 { set flags for a5 }
beq @LHC_5
{ init self for the constructor }
move.l a5,12(a6)
@LHC_4:
{ is there a VMT address ? }
move.l 8(a6),d0
or.l d0,d0
bne @LHC_7
{ In case the constructor doesn't do anything, the Zero-Flag }
{ can't be put, because this calls Fail() }
add.l #1,d0
rts
@LHC_7:
{ set zero inside the object }
{ Save Registers }
movem.l d0-a7,-(sp)
move.w #0,-(sp)
move.l 8(a6),a0
move.l (a0),-(sp)
move.l a5,-(sp)
{ }
jsr FPC_FILLOBJECT
{ Restore all registers in the correct order }
movem.l (sp)+,d0-a7
{ set the VMT address for the new created object }
{$ifdef OBJECTVMTOFFSET}
{ the offset is in %edi since the calling and has not been changed !! }
move.l 8(a6),d1
move.l d1,(a5,d0.l)
{$else OBJECTVMTOFFSET}
move.l 8(a6),d0
move.l d0,(a5)
{$endif OBJECTVMTOFFSET}
or.l d0,d0
@LHC_5:
rts
end;
end;
procedure help_fail;
begin
asm
end;
end;
procedure int_help_destructor;[public,alias:'FPC_HELP_DESTRUCTOR'];
begin
asm
{ Stack (relative to %ebp):
12 Self
8 VMT-Address
4 Main program-Addr
0 %ebp
d0 contains vmt_offset
}
{ temporary Variable }
subq.l #4,sp
move.l sp,d6
{ Save Registers }
movem.l d0-a7,-(sp)
move.l 8(a6),d1 { Get the address of the vmt }
or.l d1,d1 { Check if there is a vmt }
beq @LHD_3
{ Yes, get size from SELF! }
move.l 12(a6),a0
{ get VMT-pointer (from Self) to %ebx }
{$ifdef OBJECTVMTOFFSET}
{ the offset is in d0 since the calling and has not been changed !! }
move.l (a0,d0.l),a1
{$else OBJECTVMTOFFSET}
move.l (a0),a1
{$endif OBJECTVMTOFFSET}
{ And put size on the Stack }
move.l (a1),-(sp)
{ SELF }
{ I think for precaution }
{ that we should clear the VMT here }
clr.l (a0)
{ get address of local variable into }
{ address register }
move.l d6,a1
move.l a0,(a1)
move.l a1,-(sp)
jsr FPC_FREEMEM
@LHD_3:
{ Restore all registers in the correct order }
movem.l (sp)+,d0-a7
add.l #4,sp
rts
end;
end;
procedure new_class;assembler;[public,alias:'FPC_NEW_CLASS'];
asm
{ create class ? }
move.l 8(a6), d0
tst.l d0
{ check for nil... }
beq @NEW_CLASS1
{ a5 contains vmt }
move.l a5,-(sp)
{ call newinstance (class method!) }
jsr 16(a5)
{ new instance returns a pointer to the new created }
{ instance in d0 }
{ load a5 and insert self }
move.l d0,8(a6)
move.l d0,a5
bra @end
@NEW_CLASS1:
move.l a5,8(a6)
@end:
end;
procedure dispose_class;assembler;[public,alias:'FPC_DISPOSE_CLASS'];
asm
{ destroy class ? }
move.l 8(a6),d0
{ save self }
move.l a5,8(a6)
tst.l d0
beq @DISPOSE_CLASS
{ no inherited call }
move.l (a5),d0
{ push self }
move.l a5,-(sp)
{ call freeinstance }
move.l d0,a0
jsr 20(a0)
@DISPOSE_CLASS:
{ load self }
move.l 8(a6),a5
end;
{ checks for a correct vmt pointer }
procedure int_check_object;assembler;[public,alias:'FPC_CHECK_OBJECT'];
{ ON ENTRY: a0 -> Pointer to the VMT }
{ Nota: All registers must be preserved including }
{ A0 itself! }
asm
move.l d0,-(sp)
tst.l a0
{ z flag set if zero }
beq @co_re
move.l (a0),d0
add.l 4(a0),d0
bne @co_re
bra @end
@co_re:
move.l (sp)+,d0
move.b #210,d0
jsr FPC_HALT_ERROR
@end:
move.l (sp)+,d0
end;
function get_frame : longint; assembler;
asm
move.l a6,d0
end;
function get_caller_addr(framebp:longint):longint;
begin
asm
move.l FRAMEBP,a0
cmp.l #0,a0
beq @Lnul_address
move.l 4(a0),a0
@Lnul_address:
move.l a0,@RESULT
end ['a0'];
end;
function get_caller_frame(framebp:longint):longint;
begin
asm
move.l FRAMEBP,a0
cmp.l #0,a0
beq @Lnul_frame
move.l (a0),a0
@Lnul_frame:
move.l a0,@RESULT
end ['a0'];
end;
{ procedure strcopy(dstr,sstr : pointer;len : longint);[public,alias: 'STRCOPY'];}
procedure strcopy; assembler;[public,alias: 'FPC_STRCOPY'];
{---------------------------------------------------}
{ Low-level routine to copy a string to another }
{ string with maximum length. Never call directly! }
{ On Entry: }
{ a1.l = string to copy to }
{ a0.l = source string }
{ d0.l = maximum length of copy }
{ registers destroyed: a0,a1,d0,d1 }
{---------------------------------------------------}
asm
{ move.l 12(a6),a0
move.l 16(a6),a1
move.l 8(a6),d1 }
move.l d0,d1
move.b (a0)+,d0 { Get source length }
and.w #$ff,d0
cmp.w d1,d0 { This is a signed comparison! }
ble @LM4
move.b d1,d0 { If longer than maximum size of target, cut
source length }
@LM4:
andi.l #$ff,d0 { zero extend d0-byte }
move.l d0,d1 { save length to copy }
move.b d0,(a1)+ { save new length }
{ Check if copying length is zero - if so then }
{ exit without copying anything. }
tst.b d1
beq @Lend
bra @LMSTRCOPY55
@LMSTRCOPY56: { 68010 Fast loop mode }
move.b (a0)+,(a1)+
@LMSTRCOPY55:
dbra d1,@LMSTRCOPY56
@Lend:
end;
{ Concatenate Strings }
{ PARAMETERS ARE REVERSED COMPARED TO NORMAL! }
{ therefore online assembler may not parse the params as normal }
procedure strconcat(s1,s2 : pointer);[public,alias: 'STRCONCAT'];
begin
asm
move.b #255,d0
move.l s1,a0 { a0 = destination }
move.l s2,a1 { a1 = source }
sub.b (a0),d0 { copyl:= 255 -length(s1) }
move.b (a1),d6
and.w #$ff,d0 { Sign flags are checked! }
and.w #$ff,d6
cmp.w d6,d0 { if copyl > length(s2) then }
ble @Lcontinue
move.b (a1),d0 { copyl:=length(s2) }
@Lcontinue:
move.b (a0),d6
and.l #$ff,d6
lea 1(a0,d6),a0 { s1[length(s1)+1] }
add.l #1,a1 { s2[1] }
move.b d0,d6
{ Check if copying length is zero - if so then }
{ exit without copying anything. }
tst.b d6
beq @Lend
bra @ALoop
@Loop:
move.b (a1)+,(a0)+ { s1[i] := s2[i]; }
@ALoop:
dbra d6,@Loop
move.l s1,a0
add.b d0,(a0) { change to new string length }
@Lend:
end ['d0','d1','a0','a1','d6'];
end;
{ Compares strings }
{ DO NOT CALL directly. }
{ a0 = pointer to first string to compare }
{ a1 = pointer to second string to compare }
{ ALL FLAGS are set appropriately. }
{ ZF = strings are equal }
{ REGISTERS DESTROYED: a0, a1, d0, d1, d6 }
procedure strcmp; assembler;[public,alias:'FPC_STRCMP'];
asm
move.b (a0)+,d0 { Get length of first string }
move.b (a1)+,d6 { Get length of 2nd string }
move.b d6,d1 { Save length of string for final compare }
cmp.b d0,d6 { Get shortest string length }
ble @LSTRCONCAT1
move.b d0,d6 { Set length to shortest string }
@LSTRCONCAT1:
tst.b d6 { Both strings have a length of zero, exit }
beq @LSTRCONCAT2
andi.l #$ff,d6
subq.l #1,d6 { subtract first attempt }
{ if value is -1 then don't loop and just compare lengths of }
{ both strings before exiting. }
bmi @LSTRCONCAT2
or.l d0,d0 { Make sure to set Zerfo flag to 0 }
@LSTRCONCAT5:
{ Workaroung for GAS v.134 bug }
{ old: cmp.b (a1)+,(a0)+ }
cmpm.b (a1)+,(a0)+
@LSTRCONCAT4:
dbne d6,@LSTRCONCAT5 { Repeat until not equal }
bne @LSTRCONCAT3
@LSTRCONCAT2:
{ If length of both string are equal }
{ Then set zero flag }
cmp.b d1,d0 { Compare length - set flag if equal length strings }
@LSTRCONCAT3:
end;
Function strpas(p: pchar): string;
{ only 255 first characters are actually copied. }
var
counter : byte;
str: string;
Begin
counter := 0;
str := '';
while (ord(p[counter]) <> 0) and (counter < 255) do
begin
counter:=counter+1;
str[counter] := char(p[counter-1]);
end;
str[0] := char(counter);
strpas := str;
end;
function strlen(p : pchar) : longint;
var
counter : longint;
Begin
counter := 0;
repeat
counter:=counter+1;
until ord(p[counter]) = 0;
strlen := counter;
end;
procedure move(var source;var dest;count : longint);
{ base pointer+8 = source }
{ base pointer+12 = destination }
{ base pointer+16 = number of bytes to move}
begin
asm
clr.l d0
move.l 16(a6),d0 { number of bytes }
@LMOVE0:
move.l 12(a6),a1 { destination }
move.l 8(a6),a0 { source }
cmpi.l #65535, d0 { check, if this is a word move }
ble @LMEMSET00 { use fast dbra mode 68010+ }
cmp.l a0,a1 { check copy direction }
bls @LMOVE4
add.l d0,a0 { move pointers to end }
add.l d0,a1
bra @LMOVE2
@LMOVE1:
move.b -(a0),-(a1) { (s < d) copy loop }
@LMOVE2:
subq.l #1,d0
cmpi.l #-1,d0
bne @LMOVE1
bra @LMOVE5
@LMOVE3:
move.b (a0)+,(a1)+ { (s >= d) copy loop }
@LMOVE4:
subq.l #1,d0
cmpi.l #-1,d0
bne @LMOVE3
bra @LMOVE5
@LMEMSET00: { use fast loop mode 68010+ }
cmp.l a0,a1 { check copy direction }
bls @LMOVE04
add.l d0,a0 { move pointers to end }
add.l d0,a1
bra @LMOVE02
@LMOVE01:
move.b -(a0),-(a1) { (s < d) copy loop }
@LMOVE02:
dbra d0,@LMOVE01
bra @LMOVE5
@LMOVE03:
move.b (a0)+,(a1)+ { (s >= d) copy loop }
@LMOVE04:
dbra d0,@LMOVE03
{ end fast loop mode }
@LMOVE5:
end ['d0','a0','a1'];
end;
procedure fillword(var x;count : longint;value : word);
begin
asm
move.l 8(a6), a0 { destination }
move.l 12(a6), d1 { number of bytes to fill }
move.w 16(a6),d0 { fill data }
bra @LMEMSET21
@LMEMSET11:
move.w d0,(a0)+
@LMEMSET21:
subq.l #1,d1
cmp.b #-1,d1
bne @LMEMSET11
end ['d0','d1','a0'];
end;
function abs(l : longint) : longint;
begin
asm
move.l 8(a6),d0
tst.l d0
bpl @LMABS1
neg.l d0
@LMABS1:
move.l d0,@RESULT
end ['d0'];
end;
function odd(l : longint) : boolean;
begin
if (l and $01) = $01 then
odd := TRUE
else
odd := FALSE;
end;
function sqr(l : longint) : longint;
begin
sqr := l*l;
end;
procedure int_str(l : longint;var s : string);
var
value: longint;
negative: boolean;
begin
negative := false;
s:='';
{ Workaround: }
if l=$80000000 then
begin
s:='-2147483648';
exit;
end;
{ handle case where l = 0 }
if l = 0 then
begin
s:='0';
exit;
end;
If l < 0 then
begin
negative := true;
value:=abs(l);
end
else
value:=l;
{ handle non-zero case }
while value>0 do
begin
s:=char((value mod 10)+ord('0'))+s;
value := value div 10;
end;
if negative then
s := '-' + s;
end;
Function Sptr : Longint;
begin
asm
move.l sp,d0
add.l #8,d0
move.l d0,@RESULT
end ['d0'];
end;
Procedure BoundsCheck;assembler;[public,alias:'FPC_RE_BOUNDS_CHECK'];
{ called by code generator with R+ state to }
{ determine if a range check occured. }
{ Only in 68000 mode, in 68020 mode this is }
{ inline. }
{ On Entry: }
{ A1 = address contaning min and max indexes }
{ D0 = value of current index to check. }
asm
cmp.l (A1),D0 { lower bound ... }
bmi @rebounderr { is index lower ... }
add.l #4,A1
cmp.l (A1),D0
bmi @reboundend
beq @reboundend
@rebounderr:
move.l #201,d0
jsr FPC_HALT_ERROR
@reboundend:
end;
{****************************************************************************
IoCheck
****************************************************************************}
procedure int_iocheck(addr : longint);[public,alias: {$ifdef FPCNAMES}'FPC_'+{$endif}'IOCHECK'];
var
l : longint;
begin
asm
movem.l d0-a7,-(sp)
end;
if InOutRes<>0 then
begin
l:=InOutRes;
InOutRes:=0;
If ErrorProc<>Nil then
TErrorProc(Errorproc)(l,pointer(addr));
{$ifndef RTLLITE}
writeln('IO-Error ',l,' at 0x',HexStr(addr,8));
{$endif}
Halt(byte(l));
end;
asm
movem.l (sp)+,d0-a7
end;
end;
{
$Log: m68k.inc,v $
Revision 1.4 2004/01/02 17:22:14 jonas
+ fpc_cpuinit procedure to allow cpu/fpu initialisation before any unit
initialises
+ fpu exceptions for invalid operations and division by zero enabled for
ppc
Revision 1.3 2002/09/07 16:01:20 peter
* old logs removed and tabs fixed
}
syntax highlighted by Code2HTML, v. 0.9.1